EP0466433A2 - Apparatus for making a printing plate and a printing plate thereof - Google Patents
Apparatus for making a printing plate and a printing plate thereof Download PDFInfo
- Publication number
- EP0466433A2 EP0466433A2 EP91306174A EP91306174A EP0466433A2 EP 0466433 A2 EP0466433 A2 EP 0466433A2 EP 91306174 A EP91306174 A EP 91306174A EP 91306174 A EP91306174 A EP 91306174A EP 0466433 A2 EP0466433 A2 EP 0466433A2
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- EP
- European Patent Office
- Prior art keywords
- printing plate
- laser beam
- laser
- holes
- printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
Definitions
- the present invention generally relates to apparatus for making a printing plate and a printing plate thereof and, more particularly, is directed to an apparatus for making a printing plate and a printing plate thereof suitable for the printing, such as a gravure printing and so on.
- a wide variety of printing methods are proposed for the printing and a variety of printing plates, such as relief printing, offset printing, intaglio printing, silk screen printing or the like are employed. Particularly, when pictures such as photographs and so on are printed on a large number of copies at high speed, the intaglio printing is used.
- the assignee of the present application has previously proposed an inexpensive apparatus for making a printing plate and a printing plate thereof.
- the previously-proposed apparatus and the printing plate thereof can provide a printing of high quality and are suitable for the printing of medium quantity of papers so that they can be made for personal use or for office use (see U.S. Patent Application Serial No. 07/404,555 filed September 8 1989).
- FIG. 1 shows a conceptual diagram of an optical system of such previously-proposed apparatus for making a printing plate.
- a small energy emitting type semiconductor laser 1 of about 1 Watt is employed to form holes 3 on a printing plate 2.
- an input image signal 4 from an image scanner or the like is supplied to the semiconductor laser 1, in which it is directly modulated by turning on and off the semiconductor laser 1 by the image input signal which results from pulse code modulating (PCM) a drive current. For this reason, a laser beam emitted from the semiconductor laser 1 is turned on and off in synchronism with the image signal.
- PCM pulse code modulating
- the laser beam from the semiconductor laser 1 is collimated by a collimator lens 5 and introduced through an objective lens 6 into the printing plate 2 so that the laser beam is focused on the surface position of the printing plate 2.
- the semiconductor laser 1, the collimator lens 5 and the objective lens 6 constitute a laser block 14, and this laser block 14 is located so as to focus the laser beam on a plate cylinder 8 at its predetermined position on the leftmost side.
- the plate cylinder 8 is rotated in the direction shown by an arrow B in FIG.
- a plate cylinder rotating motor (not shown) coupled to a plate cylinder shaft 9 so that, when the plate cylinder 8 is rotated once, the holes 3 of one track along the circumference of the plate cylinder 8 are scattered by the laser beams to thereby form the holes 3 of predetermined one track amount. Then, if the laser block 14 is moved in the axial direction of the plate cylinder 8 by the amount of one pixel to allow the laser beam to scan the surface of the printing plate 2, the predetermined holes 3 are formed over two tracks.
- holes 3 corresponding to the light and shade (i.e., image information) of the input image signal 4 are formed on a synthetic resin material coated on the surface of the printing plate 2.
- the angles of the printing plates 2 of deep colors such as cyan, magenta, black or the like are set to be 30 degrees in which the moiré becomes inconspicuous relatively such as when the angle of the black printing plate 2 is 45 degrees, the angle of the magenta printing plate 2 is 75 degrees, the angle of the yellow printing plate 2 is 90 degrees and the angle of the cyan printing plate 2 is 105 degrees. If the attaching angle is 15 degrees, the moiré tends to become conspicuous as compared with the attaching angle of 30 degrees.
- the moiré can be made inconspicuous.
- the pattern of the hole 3 formed on the printing plate 2 by the apparatus for making a printing plate is hyperelliptic as shown by reference numeral 10 in FIG. 2.
- the major axis length of this hyperelliptic pattern 10 is 150 ⁇ m and the minor axis length thereof is about 5 ⁇ m.
- the pattern of hole 3 is hyperelliptic, it is possible to obtain the printing plate in which the shape, pitch or angle of the pattern 10 of the hole 3 formed on the printing plate 2 are variously changed only by adjusting the optical system of the apparatus for making a printing plate.
- an apparatus for making a printing plate in which a printing plate made of a thermoplastic resin sheet is wrapped around a plate cylinder and a laser beam from a laser light source is irradiated on the printing plate to form holes in accordance with image information is comprised of angle adjusting means for adjusting an irradiation angle of the laser beam from the laser light source and control means for controlling the irradiation start position of the laser beam such that holes on the printing plate are made co extensible at a predetermined angle.
- the term "holes" is not limited to holes which extend entirely through the sheet but encompasses surface treatments sufficient to achieve printing, e.g. depressions on the surface.
- a printing plate having different dot patterns can be obtained by scanning the elliptic pattern of the laser beam projected on the printing plate in the minor axis direction. Also, a printing plate having different dot patterns and different dot angles can be obtained with ease by rotating the optical axis of the laser light source in the clockwise or counter-clockwise direction by the single optical system. Further, if the printing is made by using a plurality of printing plates thus obtained, it is possible to effectively prevent the occurrence of moiré. Furthermore, if the dots are coupled on the line, then it is possible to suppress the cause of occurrence of the moiré.
- Embodiments of the apparatus for making a printing plate and the printing plate thereof according to the present invention will hereinafter be described with reference to FIGS. 3 through 17.
- FIG. 3 shows a systematic block diagram of the apparatus for making a printing plate according to the embodiment of the present invention and is formed of FIGS. 3A and 3B drawn on two sheets of drawings so as to permit the use of a suitably large scale.
- Data image information corresponding to the light and shade of the image signal is supplied to the semiconductor laser 1 through this system shown in FIGS. 3A, 3B.
- FIGS. 3A, 3B like parts corresponding to those of FIGS. 1 and 2 are marked with the same references and therefore need not be described in detail.
- a status signal 31 such as stop, reset or the like is supplied from an input operation unit 30 to a microcomputer (hereinafter referred to as a CPU (central processing unit)) 32.
- the CPU 32 supplies a positive rotation pulse or a reverse rotation pulse to a laser block moving motor driver 33 and a plate cylinder rotating motor driver 34 to drive the laser block moving motor 34 and the plate cylinder rotating motor 36.
- the plate cylinder driving motor 38 rotates the plate cylinder 8 and the semiconductor laser 1 forms the holes 3 corresponding to data 48 of the input image signal from an input signal source 49 on the printing plate 2.
- the laser block moving motor 34 is moved by the amount of one pixel data.
- the CPU 32 includes a control means which rotates the plate cylinder 8 in the up or down direction by the amount of half pixel to thereby control the irradiation position of the laser beam so that the holes 3 are made continuous at a predetermined angle.
- a rotational angle of the plate cylinder 8 may be detected by using a rotary encoder 90 and a data reading start the from a data RAM (random access memory) 38 may be shifted by a predetermined rotational angle.
- the data RAM 38 stores 8 bits of digital image data D obtained by an image scanner or the like per pixel.
- the CPU 32 drives an address counter 37 so as to supply an output address A to the data RAM 38.
- the image data D is supplied to the addresses A17 to A10 of the gray scale ROM 41 and the gray scale ROM 41 is supplied at its addresses A9 to A0 with 10 bits from a counter 40 which is driven by a pulse from a pulse generator 39.
- the gray scale RAM 41 is adapted to convert the light and shade of the image into a duration of the laser irradiation time.
- Data of the gray scale ROM 41 is supplied to an AND gate 42 and the modulated pulse from the pulse generator 39 is controlled, whereby the semiconductor laser 1 is driven by means of a laser driver 43.
- the CPU 32 controls a stepping motor 46 which can adjust the irradiation angle of semiconductor laser 1 provided within the laser block. More specifically, the CPU 32 supplies a stepping motor control circuit 44 with data corresponding to the instruction with respect to the radiation angle of the semiconductor laser 1 from the input operation unit 30. Then, the stepping motor control circuit 44 supplies this data to the stepping motor driver 45 to rotate the stepping motor 46 by a predetermined rotational angle.
- FIG. 4 is a plan view illustrating the apparatus according to the embodiment of the present invention.
- a plate cylinder rotating unit 12 and a a laser block moving unit 13 are mounted on a base table 13.
- the laser block 14 is moved along a guide unit 15 in the axial direction of the plate cylinder 8.
- FIG. 5 which shows the mounted condition of the printing plate 2
- the plate cylinder 8 of the plate cylinder rotating unit 12 is cylindrical and made of metal.
- the printing plate 2 made of synthetic resin is wrapped along the outer diameter of the cylindrical portion of the plate cylinder rotating unit 12 and secured thereto by fitting flat head screws 16 into screw apertures 17 bored through the plate cylinder 8.
- the method for securing the printing plate 2 around the cylindrical portion of the plate cylinder rotating unit 12 is not limited to the above method and a variety of methods may be selected properly.
- the printing plate 2 is secured around the cylindrical portion by a double-sided adhesive tape or the like.
- the printing plate 2 may be made of a thermoplastic resin whose boiling point is distributed in a relatively narrow range and which is sufficiently hard when cured and in which resin is scattered or sublimated at low temperature when melted.
- a thermoplastic resin in which about 20 % of carbon is mixed into polyethylene resin, acrylic resin, polypropylene resin or the like.
- a thickness t of the printing plate 2 is selected to be about 200 microns.
- Metal caps 19R, 19L are inserted into the right and left ends of the plate cylinder 8 so as to secure the right and left ends of the printing plate 2.
- Shafts 18R, 18L are implanted on the caps 19R, 19L and coupled to the plate cylinder rotating motor 36, whereby the plate cylinder 8 is rotated in the direction shown by an arrow B in FIG. 5.
- reference numerals 20R, 20L designate bearing portions which receive the shafts 18R, 18L of the metal caps 20R, 20L, respectively.
- the laser block 14 is disposed in an opposing relation to the printing plate 2 wrapped around the plate cylinder 8 and is arranged so as to move along a guide portion 15 in the axial direction of the plate cylinder 8.
- the laser block moving unit 13 for moving this laser block 14 is bridged between the bearing portions 21R and 21L and includes a moving member 24 which is engaged with a screw lever 23 rotated by the laser block moving motor 34 so as to move.
- a laser rod attaching base 50 of the laser block 14 is secured to the moving member 24.
- FIG. 6 is a perspective view illustrating the entirety of the laser block 14 in its assembled state
- FIG. 7 is a party cross-sectional plan view of the assembled state of the laser block 14
- FIG. 8 is an exploded perspective view of the laser block 14.
- a stepping motor attaching plate 51 is secured to a laser head mounting base 50 formed of a plate of substantially T-letter configuration by screws and the stepping motor 46 is secured to this mounting plate 51 as shown in FIG. 8.
- a first gear 52 is engaged into and secured to the rotary shaft of the stepping motor 46.
- a laser holder supporting box 53 is secured to the laser head mounting base 50 and the optical system of the semiconductor laser 1 or the like is assembled within this supporting box 53.
- the semiconductor laser 1 is secured to a semiconductor laser support 54 and is supplied with an electrical signal from a through-hole 55 bored through the central portion of the semiconductor laser support 54 through a stem pin.
- This semiconductor laser support 54 is screwed by screws 60 into tap bores 59 bored through the rear surface of a laser holder 58 engaged into a through-hole 57 bored through the center of a second gear 56.
- a first stepped portion 62 elongated from a flange portion 61 of the laser holder 58 is loosely fitted into a through-hole 64 bored through the center of the laser holder supporting box 53 so as to be freely rotatable, while the through-hole 57 of the second gear 56 is inserted into and secured to the second stepped portion 63 of the laser holder 58.
- the top of the semiconductor laser 1 is protrusively inserted into one side end of a central aperture 64 bored through the center of the laser holder 58 and the collimator lens 5 is inserted into this central aperture 64 by means of a collimator lens adjusting coil spring 65. Then, a collimator lens adjusting screw 66 is inserted into and screwed into the central aperture 64 and the collimator lens 5 is housed in and secured to the laser holder 58.
- An outer portion of an objective lens holder 67 is composed of a stepped portion 68 whose outer diameter is the same as that of the flange portion 61 of the laser holder 58, a flange portion 69 and a screw portion 70 having screws formed therearound, and a central aperture 71 is formed at the central portion of the objective lens holder 67.
- the stepped portion 68 of the objective lens holder 67 is engaged into the through-hole 64 of the laser holder supporting box 53, an objective lens cover 73 into which the objective lens 6 is inserted is inserted through a focus adjusting spring 72 into a central aperture 71 and a focus adjusting screw 74 is screwed into the screw portion 70, thereby the laser block 14 being constructed.
- an angle adjusting means 53 for adjusting the radiation angle of the laser is composed of the stepping motor 46, the first and second gears 52, 56 and the laser holder 58.
- the input image signal from the input signal source 49 such as the image scanner or the like is supplied to and pulse code modulated so as to be turned on and off.
- the hyperelliptic pattern 10 shown in FIG. 9A is formed on the printing plate 2 by an "on” pulse and an "off” pulse shown in FIG. 9B in the prior art, according to this embodiment, a rectangular pattern 10a or a square pattern 10b shown in FIG. 9A is obtained.
- the irradiation angle of the semiconductor laser 1 is rotated by a predetermined angle from the hyperelliptic pattern 10 of the horizontal direction as shown in FIG. 11A to the clockwise or counter-clockwise direction before forming the holes 3 on the printing platet 2 so that the irradiation angle is inclined as shown by a pattern 10c shown in FIG. 10A.
- the irradiation angle of the semiconductor laser 1 is inclined by a predetermined angle, such predetermined angle is instructed to the CPU 32 by the input operation unit 30 and then the CPU 32 instructs the pulse number for inclining the irradiation angle by a predetermined angle to the stepping motor control circuit 44, whereby the stepping motor 46 is stepped by a predetermined angle.
- the laser holder 58 is rotated by a predetermined angle in the clockwise or counter-clockwise direction via the first and second gears 52 and 56 so that the irradiation angle of the semiconductor laser 1 is changed to produce the pattern 10c of FIG. 10A. Under this condition, although the "on" pulse and "off” pulse are set in a relation shown in FIG.
- the shape of the pattern can be changed variously from rectangular, square and lozenge so that dot angle, dot shape and dot pitch can be changed with ease. Therefore, it is possible to obtain the apparatus for making a printing plate and a printing plate thereof in which moiré of the printed product can be avoided with ease.
- FIGS. 11A through 11F are representations of patterns of various configurations formed on the printing plate 2. In these patterns shown in FIGS. 11A to 11F, the concentration of the pattern is made uniform in order to understand the configurations of the patterns more clearly.
- the hyperelliptic pattern 10 in the horizontal direction is rotated in the counter-clockwise direction and the rotational angle is 30 degrees.
- the hyperelliptic pattern 10 is rotated in the clockwise direction and the rotational angle is 30 degrees, that is, -30 degrees.
- the hyperelliptic patterns 10 in the horizontal direction are respectively rotated in the counter-clockwise and clockwise directions by 60 degrees.
- the laser irradiation is started at the position a half pixel above the position of the pattern 77a.
- the starting points 77a, 78b, ... are positioned in the X axis direction in a zigzag-fashion and therefore such pattern is presented, in which the holes are formed continuously substantially in the irradiation direction of laser beam as generally seen from the printing plate. Further, the pitches in the X direction and Y direction between the pixels are properly set.
- FIG. 11E shows the pattern of the printing plate 2e which is obtained by the method described with reference to FIG. 7 without changing the angle.
- FIG. 11F shows the pattern in which the major axis of the hyperelliptic pattern obtained by the semiconductor laser 1 is made coincident with the vertical direction by adjusting the angle and the laser beam is scanned in the X axis direction.
- the pattern is formed by moving the semiconductor laser pattern 10 shown in FIG. 9A along the circumferential direction (Y axis direction) of the plate cylinder 8 similarly to FIG. 11E and in this case, a gap 79 between adjacent tracks provided when the pattern of one track is formed is increased.
- FIGS. 12A through 12F show dot patterns 80a to 80g of printing products obtained by the sheets 2a, 2b, 2c, 2d, 2e. 2f shown in FIGS. 11A through 11G.
- the dot patterns 12A through 12F are composed of the dot patterns 80a, 80b, 80c, 80d having an inclined stripe pattern in which dots are made continuous on the line and the dot patterns 80e, 80f having horizontal and vertical stripes so that the cause of moiré can be reduced by a half as compared with other dot patterns.
- cyan C is printed by the printing plate 2a shown, for example, in FIG. 11A
- magenta M is printed by the printing plate 2b shown in FIG. 11B
- yellow Y and blue B are printed by the printing plate 2g shown in FIG. 11G with the result that printed products in which moiré is inconspicuous could be obtained.
- FIG. 14A shows the intaglio printing dot pattern of the printing plate 2a in an enlarged scale.
- a, b, c, d and e, f, g, h are printing plate dot patterns between adjacent slant lines 82, 83, then printing plate dots a, b, c, d and e, f, g, h are coupled to one another to obtain printed products of slant stripe lines 82, 83.
- inks A and E slightly contact with the intaglio dot pattern a on the line 82 and the intaglio dot pattern e on the line 83 by means of a doctor knife or the like as shown in FIG.
- FIG. 16 shows a part of the intaglio dot pattern represented by reference letter W in FIG. 15 in an enlarged scale. As shown in FIG.
- such a pattern is formed that intaglio slots a3, b3, c3, d3, a2, b2, c2, d2, e2, f3, g3, h3 and e2, f2, g2, h2 are formed closely above and below the intaglio dot patterns a, b, c, d and e, f, g, h on the lines 82 and 83 so as to have widths narrower than those of the above intaglio dot patterns a, b, c, d and e, f, g, h.
- Such pattern as shown in FIG. 16 can be arranged with ease by the earlier-noted arrangement of FIG. 3.
- the irradiation angle of the laser beam from the semiconductor laser 1 is adjusted so as to become 30 degrees in the counter-clockwise direction and then narrow, wide and narrow "on" pulses are supplied to the semiconductor laser 1.
- the ink from the intaglio dot pattern a is influenced with the intaglio slots a3, a2
- the ink from the intaglio dot pattern e is influenced with the intaglio slots e3, e2, thereby producing the pattern in which the intaglio patterns a and e can be separated from each other.
- the ink escaped from the intaglios dot pattern a reaches the intaglio slots a2 and e3 in FIG. 16, then the amount of the ink escaped from the intaglio slot e3 is small as compared with the amount of the ink escaped from the intaglio dot pattern e. Then, this influence can be substantially prevented from being exerted upon the intaglio slots f3 and b2.
- FIG. 17 shows a further example of the printing plate of the present invention.
- the lower side intaglio slots a2 , b2 , c2 , d2 and e2 , f2 , g2 , h2 shown in FIG. 16 are removed and the intaglio slots are provided only in the upper side as shown by a3 , b3 , c3 , d3 and e3 , f3 , g3 , h3 .
- the irregular continuous dots on the printed product can be reduced so that the printed product in which the gradation is partly changed abruptly cannot be made with ease. Furthermore, it is possible to obtain the apparatus for making a printing plate and the printing plate thereof in which the moiré can be reduced.
- the apparatus for making a printing plate and the printing plate thereof of the present invention it is possible to obtain the printing plate having a variety of dot patterns only by changing the optical system of the apparatus for making a printing plate. Also, by making the gravure printing by using the printing plates in which the dot angles and the dot patterns of these printing plates are changed, it is possible to obtain the printed product in which the occurrence of moiré can be suppressed.
Abstract
Description
- The present invention generally relates to apparatus for making a printing plate and a printing plate thereof and, more particularly, is directed to an apparatus for making a printing plate and a printing plate thereof suitable for the printing, such as a gravure printing and so on.
- A wide variety of printing methods are proposed for the printing and a variety of printing plates, such as relief printing, offset printing, intaglio printing, silk screen printing or the like are employed. Particularly, when pictures such as photographs and so on are printed on a large number of copies at high speed, the intaglio printing is used.
- The assignee of the present application has previously proposed an inexpensive apparatus for making a printing plate and a printing plate thereof. The previously-proposed apparatus and the printing plate thereof can provide a printing of high quality and are suitable for the printing of medium quantity of papers so that they can be made for personal use or for office use (see U.S. Patent Application Serial No. 07/404,555 filed September 8 1989).
- FIG. 1 shows a conceptual diagram of an optical system of such previously-proposed apparatus for making a printing plate. According to this conventional apparatus, a small energy emitting
type semiconductor laser 1 of about 1 Watt is employed to formholes 3 on aprinting plate 2. - As shown in FIG. 1, an
input image signal 4 from an image scanner or the like is supplied to thesemiconductor laser 1, in which it is directly modulated by turning on and off thesemiconductor laser 1 by the image input signal which results from pulse code modulating (PCM) a drive current. For this reason, a laser beam emitted from thesemiconductor laser 1 is turned on and off in synchronism with the image signal. - Referring to FIG. 1, the laser beam from the
semiconductor laser 1 is collimated by acollimator lens 5 and introduced through anobjective lens 6 into theprinting plate 2 so that the laser beam is focused on the surface position of theprinting plate 2. Thesemiconductor laser 1, thecollimator lens 5 and theobjective lens 6 constitute alaser block 14, and thislaser block 14 is located so as to focus the laser beam on aplate cylinder 8 at its predetermined position on the leftmost side. Theplate cylinder 8 is rotated in the direction shown by an arrow B in FIG. 1 by a plate cylinder rotating motor (not shown) coupled to aplate cylinder shaft 9 so that, when theplate cylinder 8 is rotated once, theholes 3 of one track along the circumference of theplate cylinder 8 are scattered by the laser beams to thereby form theholes 3 of predetermined one track amount. Then, if thelaser block 14 is moved in the axial direction of theplate cylinder 8 by the amount of one pixel to allow the laser beam to scan the surface of theprinting plate 2, thepredetermined holes 3 are formed over two tracks. Therefore, if such scanning of laser beam is sequentially carried out on the whole surface of theplate cylinder 8, thenholes 3 corresponding to the light and shade (i.e., image information) of theinput image signal 4 are formed on a synthetic resin material coated on the surface of theprinting plate 2. - When a printed product is produced by using the
printing plate 2 and a screen while overlapping inks, such as a cyan (C), magenta (M), yellow (Y). black (B) or the like, a dark and light stripe pattern called moiré appears in various shapes. In order to prevent moiré from occurring, angles at which theprinting plates 2 are attached to respective color printing plates are adjusted variously so as to make the moiré inconspicuous. For example, the angles of theprinting plates 2 of deep colors such as cyan, magenta, black or the like are set to be 30 degrees in which the moiré becomes inconspicuous relatively such as when the angle of theblack printing plate 2 is 45 degrees, the angle of themagenta printing plate 2 is 75 degrees, the angle of theyellow printing plate 2 is 90 degrees and the angle of thecyan printing plate 2 is 105 degrees. If the attaching angle is 15 degrees, the moiré tends to become conspicuous as compared with the attaching angle of 30 degrees. However, if the yellow printing plate of low color concentration is disposed between the cyan and magenta printing plates (in this case, the yellow printing plates are disposed at the angle of 15 degrees relative to the cryan and mageta printing plates), the moiré can be made inconspicuous. - Accordingly, it is an object of the present invention to provide an improved apparatus for making a printing plate and a printing plate thereof in which the aforementioned shortcomings and disadvantages of the prior art can be substantially eliminated.
- More specifically, it is an object of the present invention to provide an apparatus for making a printing plate and a printing plate thereof in which a printing plate having various dot patterns can be obtained only by changing the optical system of the apparatus for making a printing plate.
- It is another object of the present invention to provide an apparatus for making a printing plate and a printing plate thereof in which a printed product in which the occurrence of moiré can be suppressed can be obtained with ease.
- The pattern of the
hole 3 formed on theprinting plate 2 by the apparatus for making a printing plate is hyperelliptic as shown byreference numeral 10 in FIG. 2. By way of example, the major axis length of thishyperelliptic pattern 10 is 150 µm and the minor axis length thereof is about 5 µm. In the present invention, by making effective use of the fact that the pattern ofhole 3 is hyperelliptic, it is possible to obtain the printing plate in which the shape, pitch or angle of thepattern 10 of thehole 3 formed on theprinting plate 2 are variously changed only by adjusting the optical system of the apparatus for making a printing plate. - As a first aspect of the present invention, an apparatus for making a printing plate in which a printing plate made of a thermoplastic resin sheet is wrapped around a plate cylinder and a laser beam from a laser light source is irradiated on the printing plate to form holes in accordance with image information is comprised of angle adjusting means for adjusting an irradiation angle of the laser beam from the laser light source and control means for controlling the irradiation start position of the laser beam such that holes on the printing plate are made co extensible at a predetermined angle. It will be appreciated that the term "holes" is not limited to holes which extend entirely through the sheet but encompasses surface treatments sufficient to achieve printing, e.g. depressions on the surface.
- According to the apparatus for making a printing plate and the printing plate thereof, a printing plate having different dot patterns can be obtained by scanning the elliptic pattern of the laser beam projected on the printing plate in the minor axis direction. Also, a printing plate having different dot patterns and different dot angles can be obtained with ease by rotating the optical axis of the laser light source in the clockwise or counter-clockwise direction by the single optical system. Further, if the printing is made by using a plurality of printing plates thus obtained, it is possible to effectively prevent the occurrence of moiré. Furthermore, if the dots are coupled on the line, then it is possible to suppress the cause of occurrence of the moiré.
- The present invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which like reference numerals are used to identify the same or similar parts in the several views, and in which:-
- FIG. 1 is a conceptual diagram of an optical system showing a laser scanning system according to the prior art;
- FIG. 2 is a schematic diagram showing a projection pattern of a conventional semiconductor laser;
- FIG. 3 (formed of FIGS. 3A and 3B) is a systematic block diagram showing an apparatus for making a printing plate and a printing plate thereof according to the present invention;
- FIG. 4 is a plan view illustrating the apparatus for making a printing plate according to an embodiment of the present invention;
- FIG. 5 is a perspective view of the printing plate of the present invention and to which references will be made in explaining the condition such the printing plate is wrapped around a plate cylinder;
- FIG. 6 is a perspective view illustrating the assembled state of a laser block used in the apparatus of the present invention;
- FIG. 7 is a plan view of the laser block used in the apparatus of the present invention and illustrating its assembled state in a partly cross-sectional fashion;
- FIG. 8 is an exploded perspective view of the laser block used in the apparatus of the present invention;
- FIGS. 9A, 9B and 10A, 10B are schematic diagrams showing patterns formed by the apparatus of the present invention and waveform diagrams showing waveforms of signals used when these patterns are formed, respectively;
- FIGS. 11A through 11G are schematic diagrams showing a variety of patterns formed on the printing plates of the present invention;
- FIGS. 12A through 12G are schematic diagrams showing dot patterns of the printed products produced by the printing plates shown in FIGS. 11A to 11G, respectively;
- FIG. 13 is a schematic diagram showing a dot pattern of a defective printed product obtained by the printing plate of the present invention;
- FIGS. 14A through 14C are schematic diagrams showing dots in an enlarged scale, and to which references will be made in explaining the reason that irregularly coupled dots are produced, respectively;
- FIG. 15 is a schematic diagram showing a pattern formed on the printing plate according to other embodiment of the present invention in an enlarged scale;
- FIG. 16 is an enlarged schematic diagram of a portion represented by reference symbol W in FIG. 15; and
- FIG. 17 is a schematic diagram of a pattern formed on the printing plate according to a further embodiment of the present invention.
- Embodiments of the apparatus for making a printing plate and the printing plate thereof according to the present invention will hereinafter be described with reference to FIGS. 3 through 17.
- FIG. 3 shows a systematic block diagram of the apparatus for making a printing plate according to the embodiment of the present invention and is formed of FIGS. 3A and 3B drawn on two sheets of drawings so as to permit the use of a suitably large scale. Data (image information) corresponding to the light and shade of the image signal is supplied to the
semiconductor laser 1 through this system shown in FIGS. 3A, 3B. In FIGS. 3A, 3B, like parts corresponding to those of FIGS. 1 and 2 are marked with the same references and therefore need not be described in detail. - Referring to FIG. 3, a
status signal 31 such as stop, reset or the like is supplied from aninput operation unit 30 to a microcomputer (hereinafter referred to as a CPU (central processing unit)) 32. TheCPU 32 supplies a positive rotation pulse or a reverse rotation pulse to a laser block movingmotor driver 33 and a plate cylinder rotatingmotor driver 34 to drive the laserblock moving motor 34 and the platecylinder rotating motor 36. The platecylinder driving motor 38 rotates theplate cylinder 8 and thesemiconductor laser 1 forms theholes 3 corresponding todata 48 of the input image signal from aninput signal source 49 on theprinting plate 2. Each time theplate cylinder 8 is rotated, the laserblock moving motor 34 is moved by the amount of one pixel data. TheCPU 32 includes a control means which rotates theplate cylinder 8 in the up or down direction by the amount of half pixel to thereby control the irradiation position of the laser beam so that theholes 3 are made continuous at a predetermined angle. - While the laser radiation starting position between adjacent tracks is deviated by the amount of a half pixel by rotating the
plate cylinder 8 as described above, a rotational angle of theplate cylinder 8 may be detected by using arotary encoder 90 and a data reading start the from a data RAM (random access memory) 38 may be shifted by a predetermined rotational angle. In this fashion, theholes 3 corresponding to the light and shade of the image are sequentially formed along the circumference of theprinting plate 2. The data RAM 38stores 8 bits of digital image data D obtained by an image scanner or the like per pixel. TheCPU 32 drives anaddress counter 37 so as to supply an output address A to thedata RAM 38. In accordance with this address, the image data D is supplied to the addresses A17 to A10 of thegray scale ROM 41 and thegray scale ROM 41 is supplied at its addresses A9 to A0 with 10 bits from acounter 40 which is driven by a pulse from apulse generator 39. Thegray scale RAM 41 is adapted to convert the light and shade of the image into a duration of the laser irradiation time. Data of thegray scale ROM 41 is supplied to an ANDgate 42 and the modulated pulse from thepulse generator 39 is controlled, whereby thesemiconductor laser 1 is driven by means of alaser driver 43. - The
CPU 32 controls a steppingmotor 46 which can adjust the irradiation angle ofsemiconductor laser 1 provided within the laser block. More specifically, theCPU 32 supplies a steppingmotor control circuit 44 with data corresponding to the instruction with respect to the radiation angle of thesemiconductor laser 1 from theinput operation unit 30. Then, the steppingmotor control circuit 44 supplies this data to the steppingmotor driver 45 to rotate the steppingmotor 46 by a predetermined rotational angle. - The overall arrangement of the apparatus shown in the block diagram of FIG. 3 will be described more fully with reference to FIG. 4 and the following drawings. FIG. 4 is a plan view illustrating the apparatus according to the embodiment of the present invention.
- As shown in FIG. 4, a plate
cylinder rotating unit 12 and a a laserblock moving unit 13 are mounted on a base table 13. Thelaser block 14 is moved along aguide unit 15 in the axial direction of theplate cylinder 8. As shown in FIG. 5 which shows the mounted condition of theprinting plate 2, theplate cylinder 8 of the platecylinder rotating unit 12 is cylindrical and made of metal. Theprinting plate 2 made of synthetic resin is wrapped along the outer diameter of the cylindrical portion of the platecylinder rotating unit 12 and secured thereto by fitting flat head screws 16 intoscrew apertures 17 bored through theplate cylinder 8. The method for securing theprinting plate 2 around the cylindrical portion of the platecylinder rotating unit 12 is not limited to the above method and a variety of methods may be selected properly. For example, theprinting plate 2 is secured around the cylindrical portion by a double-sided adhesive tape or the like. - The
printing plate 2 may be made of a thermoplastic resin whose boiling point is distributed in a relatively narrow range and which is sufficiently hard when cured and in which resin is scattered or sublimated at low temperature when melted. By way of example, as the material of theprinting plate 2, it is possible to use such a thermoplastic resin in which about 20 % of carbon is mixed into polyethylene resin, acrylic resin, polypropylene resin or the like. Further, a thickness t of theprinting plate 2 is selected to be about 200 microns. Metal caps 19R, 19L are inserted into the right and left ends of theplate cylinder 8 so as to secure the right and left ends of theprinting plate 2.Shafts caps cylinder rotating motor 36, whereby theplate cylinder 8 is rotated in the direction shown by an arrow B in FIG. 5. In FIG. 4,reference numerals shafts - The
laser block 14 is disposed in an opposing relation to theprinting plate 2 wrapped around theplate cylinder 8 and is arranged so as to move along aguide portion 15 in the axial direction of theplate cylinder 8. The laserblock moving unit 13 for moving thislaser block 14 is bridged between the bearingportions 21R and 21L and includes a movingmember 24 which is engaged with ascrew lever 23 rotated by the laserblock moving motor 34 so as to move. A laserrod attaching base 50 of thelaser block 14 is secured to the movingmember 24. - The assembled condition of the
laser block 14 will be described with reference to FIGS. 6 to 8. FIG. 6 is a perspective view illustrating the entirety of thelaser block 14 in its assembled state, FIG. 7 is a party cross-sectional plan view of the assembled state of thelaser block 14 and FIG. 8 is an exploded perspective view of thelaser block 14. - As shown in FIGS. 6 to 8, a stepping
motor attaching plate 51 is secured to a laserhead mounting base 50 formed of a plate of substantially T-letter configuration by screws and the steppingmotor 46 is secured to this mountingplate 51 as shown in FIG. 8. Afirst gear 52 is engaged into and secured to the rotary shaft of the steppingmotor 46. A laserholder supporting box 53 is secured to the laserhead mounting base 50 and the optical system of thesemiconductor laser 1 or the like is assembled within this supportingbox 53. Thesemiconductor laser 1 is secured to asemiconductor laser support 54 and is supplied with an electrical signal from a through-hole 55 bored through the central portion of thesemiconductor laser support 54 through a stem pin. Thissemiconductor laser support 54 is screwed byscrews 60 into tap bores 59 bored through the rear surface of alaser holder 58 engaged into a through-hole 57 bored through the center of asecond gear 56. A first steppedportion 62 elongated from aflange portion 61 of thelaser holder 58 is loosely fitted into a through-hole 64 bored through the center of the laserholder supporting box 53 so as to be freely rotatable, while the through-hole 57 of thesecond gear 56 is inserted into and secured to the second steppedportion 63 of thelaser holder 58. The top of thesemiconductor laser 1 is protrusively inserted into one side end of acentral aperture 64 bored through the center of thelaser holder 58 and thecollimator lens 5 is inserted into thiscentral aperture 64 by means of a collimator lens adjustingcoil spring 65. Then, a collimatorlens adjusting screw 66 is inserted into and screwed into thecentral aperture 64 and thecollimator lens 5 is housed in and secured to thelaser holder 58. An outer portion of anobjective lens holder 67 is composed of a steppedportion 68 whose outer diameter is the same as that of theflange portion 61 of thelaser holder 58, aflange portion 69 and ascrew portion 70 having screws formed therearound, and acentral aperture 71 is formed at the central portion of theobjective lens holder 67. The steppedportion 68 of theobjective lens holder 67 is engaged into the through-hole 64 of the laserholder supporting box 53, anobjective lens cover 73 into which theobjective lens 6 is inserted is inserted through afocus adjusting spring 72 into acentral aperture 71 and afocus adjusting screw 74 is screwed into thescrew portion 70, thereby thelaser block 14 being constructed. Further, an angle adjusting means 53 for adjusting the radiation angle of the laser is composed of the steppingmotor 46, the first andsecond gears laser holder 58. - When the
holes 3 are formed along the circumference of theprinting plate 2 by the above-mentioned arrangement, the input image signal from theinput signal source 49 such as the image scanner or the like is supplied to and pulse code modulated so as to be turned on and off. While thehyperelliptic pattern 10 shown in FIG. 9A is formed on theprinting plate 2 by an "on" pulse and an "off" pulse shown in FIG. 9B in the prior art, according to this embodiment, arectangular pattern 10a or asquare pattern 10b shown in FIG. 9A is obtained. To this end, in a relation between an "on"pulse 75a or 75b and an "off"pulse pulse generator 39 is changed and if the values of thedata RAM 38 and thegray scale ROM 41 or the like are changed so as to extend the on period, then it is possible to obtain the rectangular orsquare pattern - Further, in this embodiment, by the above angle adjusting means 47 disposed within the
laser block 14, the irradiation angle of thesemiconductor laser 1 is rotated by a predetermined angle from thehyperelliptic pattern 10 of the horizontal direction as shown in FIG. 11A to the clockwise or counter-clockwise direction before forming theholes 3 on theprinting platet 2 so that the irradiation angle is inclined as shown by apattern 10c shown in FIG. 10A. When the irradiation angle of thesemiconductor laser 1 is inclined by a predetermined angle, such predetermined angle is instructed to theCPU 32 by theinput operation unit 30 and then theCPU 32 instructs the pulse number for inclining the irradiation angle by a predetermined angle to the steppingmotor control circuit 44, whereby the steppingmotor 46 is stepped by a predetermined angle. Thus, thelaser holder 58 is rotated by a predetermined angle in the clockwise or counter-clockwise direction via the first andsecond gears semiconductor laser 1 is changed to produce thepattern 10c of FIG. 10A. Under this condition, although the "on" pulse and "off" pulse are set in a relation shown in FIG. 10B, if the duration of the "on" pulse 75d is extended as shown in FIG. 10B in the relation between the "on" pulse 75d and the "off"pulse 76d, then it is possible to obtain apattern 10d of lozenge as shown in FIG. 10A. As described above, by properly selecting the inclination angle and the duration of the "on" pulse period, then the lozenge pattern of arbitrary configuration whose inclination angle can be changed relative to the scanning direction can be obtained intermittently. As a result, it is possible to form hole patterns whose widths are in a range of from about 150 µm to about 5 µm. Also, the shape of the pattern can be changed variously from rectangular, square and lozenge so that dot angle, dot shape and dot pitch can be changed with ease. Therefore, it is possible to obtain the apparatus for making a printing plate and a printing plate thereof in which moiré of the printed product can be avoided with ease. - FIGS. 11A through 11F are representations of patterns of various configurations formed on the
printing plate 2. In these patterns shown in FIGS. 11A to 11F, the concentration of the pattern is made uniform in order to understand the configurations of the patterns more clearly. - In the
printing plate 2a shown in FIG. 11A, thehyperelliptic pattern 10 in the horizontal direction is rotated in the counter-clockwise direction and the rotational angle is 30 degrees. In theprinting plate 2b shown in FIG. 11B, suchhyperelliptic pattern 10 is rotated in the clockwise direction and the rotational angle is 30 degrees, that is, -30 degrees. In theprinting plates hyperelliptic patterns 10 in the horizontal direction are respectively rotated in the counter-clockwise and clockwise directions by 60 degrees. When theabove printing plates 2a through 2d are produced, as earlier noted,patterns plate cylinder 8 by thesemiconductor laser 1. Next, at the starting position of a pattern 78a at the starting point after thesemiconductor laser 1 is moved in the X axis direction or in the axial direction of theplate cylinder 8 by one pixel amount, the laser irradiation is started at the position a half pixel above the position of thepattern 77a. Such control can be performed by theCPU 32 with ease. As described above, thestarting points - FIG. 11E shows the pattern of the
printing plate 2e which is obtained by the method described with reference to FIG. 7 without changing the angle. FIG. 11F shows the pattern in which the major axis of the hyperelliptic pattern obtained by thesemiconductor laser 1 is made coincident with the vertical direction by adjusting the angle and the laser beam is scanned in the X axis direction. In theprinting plate 2g of FIG. 11G, the pattern is formed by moving thesemiconductor laser pattern 10 shown in FIG. 9A along the circumferential direction (Y axis direction) of theplate cylinder 8 similarly to FIG. 11E and in this case, agap 79 between adjacent tracks provided when the pattern of one track is formed is increased. - FIGS. 12A through 12F
show dot patterns 80a to 80g of printing products obtained by thesheets dot pattern 80g shown in FIG. 12G, the dot patterns 12A through 12F are composed of thedot patterns dot patterns - Of the plurality of printing plates thus made, cyan C is printed by the
printing plate 2a shown, for example, in FIG. 11A, magenta M is printed by theprinting plate 2b shown in FIG. 11B and yellow Y and blue B are printed by theprinting plate 2g shown in FIG. 11G with the result that printed products in which moiré is inconspicuous could be obtained. - If the printed
product 80a having the continuous stripe line shown in FIG. 12A is obtained by using theprinting plate 2a shown, for example, in FIG. 11A, then a printedproduct 80a′ in whichirregular dots 81 are formed continuously as shown in FIG. 13 is obtained. Such printed product hinders the smooth change of gradation and causes the gradation to be changed partly, which results in an awkward pattern. The reason that the above-mentionedirregular dots 81 are produced will be described with reference to FIGS. 14A to 14C. FIG. 14A shows the intaglio printing dot pattern of theprinting plate 2a in an enlarged scale. Assuming now that a, b, c, d and e, f, g, h are printing plate dot patterns betweenadjacent slant lines slant stripe lines line 82 and the intaglio dot pattern e on theline 83 by means of a doctor knife or the like as shown in FIG. 14B, then a surface tension occurs between the inks A and E to escape the inks that should remain in the intaglio dot patterns a and e. As a consequence, as shown in FIG. 14C, the amount in which the ink is escaped to the outside from the intaglio dot patterns a and e is increased and thelines irregular dot patterns 81 are produced as shown in FIG. 13. - With reference to FIGS. 15 and 16, let us describe an intaglio dot pattern of a
printing plate 2a˝ in which the occurrence of the above irregularly-coupleddot pattern 81 is suppressed. FIG. 16 shows a part of the intaglio dot pattern represented by reference letter W in FIG. 15 in an enlarged scale. As shown in FIG. 16, such a pattern is formed that intaglio slots a₃, b₃, c₃, d₃, a₂, b₂, c₂, d₂, e₂, f₃, g₃, h₃ and e₂, f₂, g₂, h₂ are formed closely above and below the intaglio dot patterns a, b, c, d and e, f, g, h on thelines semiconductor laser 1 is adjusted so as to become 30 degrees in the counter-clockwise direction and then narrow, wide and narrow "on" pulses are supplied to thesemiconductor laser 1. According to the thus made printing plate, even if the ink is flowed from the intaglio dot patterns a and e by a relatively large amount, then the ink from the intaglio dot pattern a is influenced with the intaglio slots a₃, a₂ and the ink from the intaglio dot pattern e is influenced with the intaglio slots e₃, e₂, thereby producing the pattern in which the intaglio patterns a and e can be separated from each other. - If the ink escaped from the intaglios dot pattern a reaches the intaglio slots a₂ and e₃ in FIG. 16, then the amount of the ink escaped from the intaglio slot e₃ is small as compared with the amount of the ink escaped from the intaglio dot pattern e. Then, this influence can be substantially prevented from being exerted upon the intaglio slots f₃ and b₂.
- FIG. 17 shows a further example of the printing plate of the present invention. As shown in FIG. 17, the lower side intaglio slots a₂ , b₂ , c₂ , d₂ and e₂ , f₂ , g₂ , h₂ shown in FIG. 16 are removed and the intaglio slots are provided only in the upper side as shown by a₃ , b₃ , c₃ , d₃ and e₃ , f₃ , g₃ , h₃ .
- According to the thus made printing plates, the irregular continuous dots on the printed product can be reduced so that the printed product in which the gradation is partly changed abruptly cannot be made with ease. Furthermore, it is possible to obtain the apparatus for making a printing plate and the printing plate thereof in which the moiré can be reduced.
- According to the apparatus for making a printing plate and the printing plate thereof of the present invention, it is possible to obtain the printing plate having a variety of dot patterns only by changing the optical system of the apparatus for making a printing plate. Also, by making the gravure printing by using the printing plates in which the dot angles and the dot patterns of these printing plates are changed, it is possible to obtain the printed product in which the occurrence of moiré can be suppressed.
- Having described the preferred embodiments of the invention with reference to the accompanying drawings, it is to be understood that the invention is not limited to those precise embodiments and that various changes and modifications thereof could be effected by one skilled in the art without departing from the scope of the invention as defined in the appended claims.
Claims (5)
- An apparatus for making a printing plate comprising:(a) a cylinder;(b) a thermoplastic resin sheet wrapped around said cylinder;(c) first drive means coupled to said cylinder for rotating said cylinder at a predetermined rate;(d) laser beam projection means for projecting a laser beam from a semiconductor laser on said resin sheet to make holes on the resin sheet in accordance with an image information; and(e) second drive means coupled to said laser beam projection means for moving said laser beam projection means in an axial direction of said cylinder at a predetermined rate; and(f) angle adjusting means coupled to said laser beam projection means for chaging a projection angle of said laser beam.
- An apparatus for making a printing plate according to claim 1, further comprising control means for controlling the projection position of said laser beam such that said holes co extend at a predetermined angle.
- An apparatus for making a printing plate according to claim 1 or 2,wherein said laser beam is projected so as to form near said holes slots whose widths are narrower than said holes.
- A printing plate made of thermoplastic resin sheet for use in gravure printing comprising:
a plurality of holes having configuration of substantially parallelogram formed continuously at a predetermined angle in accordance with an image information. - A printing plate made of thermoplastic resin sheet for use in gravure printing comprising:
a plurality of holes formed in accordance with an image information; and
slots whose widths are narrower than holes adjacent to said plurality of holes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95200901A EP0668158B1 (en) | 1990-07-09 | 1991-07-08 | A printing plate |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP180894/90 | 1990-07-09 | ||
JP180893/90 | 1990-07-09 | ||
JP2180893A JP3036003B2 (en) | 1990-07-09 | 1990-07-09 | Plate making apparatus and method of manufacturing intaglio sheet |
JP2180894A JP3036004B2 (en) | 1990-07-09 | 1990-07-09 | Plate making apparatus, plate making method, and intaglio sheet thereof |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95200901.7 Division-Into | 1991-07-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0466433A2 true EP0466433A2 (en) | 1992-01-15 |
EP0466433A3 EP0466433A3 (en) | 1993-03-17 |
EP0466433B1 EP0466433B1 (en) | 1996-04-17 |
Family
ID=26500259
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95200901A Expired - Lifetime EP0668158B1 (en) | 1990-07-09 | 1991-07-08 | A printing plate |
EP91306174A Expired - Lifetime EP0466433B1 (en) | 1990-07-09 | 1991-07-08 | Apparatus for making a printing plate and a printing plate thereof |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95200901A Expired - Lifetime EP0668158B1 (en) | 1990-07-09 | 1991-07-08 | A printing plate |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP0668158B1 (en) |
DE (2) | DE69125958T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2253112A (en) * | 1990-12-24 | 1992-08-26 | Ms Servizi Informatici | Electronic apparatus for the laser imprinting of screen-process printing stencils and the like |
WO2000020216A1 (en) * | 1998-10-02 | 2000-04-13 | Giesecke & Devrient Gmbh | Gravure process for printing adjacent colour surfaces with various colour coating thicknesses |
EP1172227A1 (en) * | 2000-07-11 | 2002-01-16 | Tampoprint GmbH | Printing Plate and Method for its' Preparation |
CN108248200A (en) * | 2016-12-29 | 2018-07-06 | 上海运安制版有限公司 | A kind of roller and its preparation process for ceramic tile printing |
CN113478948A (en) * | 2021-07-01 | 2021-10-08 | 绍兴鑫昌印花机械科技有限公司 | Double-laser net making machine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2662455A (en) * | 1949-06-08 | 1953-12-15 | Intertype Corp | Means for gravure printing of typographical characters |
US4149183A (en) * | 1976-05-21 | 1979-04-10 | Xerox Corporation | Electronic halftone generator |
GB2030929A (en) * | 1978-09-15 | 1980-04-16 | Crosfield Electronics Ltd | Gravure printing formes |
JPS62238743A (en) * | 1986-04-10 | 1987-10-19 | Dainippon Printing Co Ltd | Doctor blade for gravure printing |
GB2223984A (en) * | 1988-09-13 | 1990-04-25 | Sony Corp | Making a gravure printing plate |
EP0370271A2 (en) * | 1988-11-24 | 1990-05-30 | Dainippon Screen Mfg. Co., Ltd. | Method of and apparatus for recording halftone images and halftone images produced thereby |
-
1991
- 1991-07-08 EP EP95200901A patent/EP0668158B1/en not_active Expired - Lifetime
- 1991-07-08 DE DE1991625958 patent/DE69125958T2/en not_active Expired - Fee Related
- 1991-07-08 DE DE1991618763 patent/DE69118763T2/en not_active Expired - Fee Related
- 1991-07-08 EP EP91306174A patent/EP0466433B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2662455A (en) * | 1949-06-08 | 1953-12-15 | Intertype Corp | Means for gravure printing of typographical characters |
US4149183A (en) * | 1976-05-21 | 1979-04-10 | Xerox Corporation | Electronic halftone generator |
GB2030929A (en) * | 1978-09-15 | 1980-04-16 | Crosfield Electronics Ltd | Gravure printing formes |
JPS62238743A (en) * | 1986-04-10 | 1987-10-19 | Dainippon Printing Co Ltd | Doctor blade for gravure printing |
GB2223984A (en) * | 1988-09-13 | 1990-04-25 | Sony Corp | Making a gravure printing plate |
EP0370271A2 (en) * | 1988-11-24 | 1990-05-30 | Dainippon Screen Mfg. Co., Ltd. | Method of and apparatus for recording halftone images and halftone images produced thereby |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 12, no. 109 (M-682)8 April 1988 & JP-A-62 238 743 ( DAINIPPON PRINTING CO LTD ) * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2253112A (en) * | 1990-12-24 | 1992-08-26 | Ms Servizi Informatici | Electronic apparatus for the laser imprinting of screen-process printing stencils and the like |
GB2253112B (en) * | 1990-12-24 | 1994-09-21 | Ms Servizi Informatici | Electronic apparatus for the laser imprinting of screen-process printing stencils and the like |
WO2000020216A1 (en) * | 1998-10-02 | 2000-04-13 | Giesecke & Devrient Gmbh | Gravure process for printing adjacent colour surfaces with various colour coating thicknesses |
US7028615B2 (en) | 1998-10-02 | 2006-04-18 | Giesecke & Devrient Gmbh | Gravure process for printing adjacent color surfaces with various color coating thicknesses |
EP1172227A1 (en) * | 2000-07-11 | 2002-01-16 | Tampoprint GmbH | Printing Plate and Method for its' Preparation |
CN108248200A (en) * | 2016-12-29 | 2018-07-06 | 上海运安制版有限公司 | A kind of roller and its preparation process for ceramic tile printing |
CN108248200B (en) * | 2016-12-29 | 2023-04-25 | 上海运安制版有限公司 | Roller for ceramic tile printing and preparation process thereof |
CN113478948A (en) * | 2021-07-01 | 2021-10-08 | 绍兴鑫昌印花机械科技有限公司 | Double-laser net making machine |
CN113478948B (en) * | 2021-07-01 | 2022-12-02 | 绍兴鑫昌印花机械科技有限公司 | Double-laser net making machine |
Also Published As
Publication number | Publication date |
---|---|
DE69125958D1 (en) | 1997-06-05 |
EP0668158A1 (en) | 1995-08-23 |
EP0668158B1 (en) | 1997-05-02 |
DE69125958T2 (en) | 1997-08-21 |
DE69118763D1 (en) | 1996-05-23 |
DE69118763T2 (en) | 1996-09-19 |
EP0466433A3 (en) | 1993-03-17 |
EP0466433B1 (en) | 1996-04-17 |
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