WO2007050454A2 - Integrated illumination assembly for symbology reader - Google Patents
Integrated illumination assembly for symbology reader Download PDFInfo
- Publication number
- WO2007050454A2 WO2007050454A2 PCT/US2006/041041 US2006041041W WO2007050454A2 WO 2007050454 A2 WO2007050454 A2 WO 2007050454A2 US 2006041041 W US2006041041 W US 2006041041W WO 2007050454 A2 WO2007050454 A2 WO 2007050454A2
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- WIPO (PCT)
- Prior art keywords
- illumination
- light
- light pipe
- set forth
- illumination assembly
- Prior art date
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10732—Light sources
Definitions
- system 151 can be controlled and can direct image data to an onboard embedded processor 109.
- This processor can include a scanning software application 113 by which lighting is controlled, images are acquired and image data is interpreted into usable information (for example, alphanumeric strings derived from the sym- s bols (such as the depicted two-dimensional barcode image 195).
- the decoded information can be directed via a cable 11 1 to a PC or other data storage device 112 having (for example) a display 114, keyboard 116 and mouse 118, where it can be stored and further manipulated using an appropriate application 121.
- the cable 111 can be directly connected to an interface in the scanning appliance and an appropriate interface o in the computer 112.
- the computer-based application 121 performs various image interpretation/decoding and lighting control functions as needed.
- the precise arrangement of the handheld scanning appliance with respect to an embedded processor, computer or other processor is highly variable.
- a wireless interconnect can be provided in which no cable 111 is present.
- the depicted microcomputer can s be substituted with another processing device, including an onboard processor or a miniaturized processing unit such as a personal digital assistant or other small-scale computing device.
- the scanning application 113 can be adapted to respond to inputs from the scanning appliance 102. For example, when the operator toggles a trigger 122 on the hand 0 held scanning appliance 102, an internal camera image sensor (that is part of the image formation system 151) acquires an image of a region of interest 131 on an object 105.
- the exemplary region of interest includes a two-dimensional symbol 195 that can be used to identify the object 105. Identification and other processing functions are carried out by the scanning application 113, based upon image data transmitted from the hand held 5 scanning appliance 102 to the processor 109.
- a visual indicator 141 can be illuminated by signals from the processor 109 to indicate a successful read and decode of the symbol 195.
- a diffuse, high-angle "bright field” illumination may best highlight these features for the sensor.
- high-angle it is meant, generally, light that strikes the subject nearly perpendicularly (normal) or at an angle that is typically no more than about 45 degrees from perpendicular (normal) to the surface of the item being scanned.
- Such illumination is subject to substantial reflection back toward the sensor.
- barcodes and other subjects requiring mainly bright field illumination may be present on a printed label adhered to an item or container, or on a printed field in a relatively smooth area of item or container.
- a peened/etched surface has two-dimensional properties that tend to scatter bright field illumination, thereby obscuring the acquired image.
- a viewed subject may be best illuminated with dark field illumination. This is an illumination with a characteristic low angle (approximately 45 degrees or less, for example) with respect to the surface of the subject (i.e. an angle of more than approximately 45 degrees with respect to normal).
- dark field illumination two- dimensional surface texture is contrasted more effectively (with indents appearing as bright spots and the surroundings as shadow) for better image acquisition.
- a diffuse direct illumination may be pre- ferred.
- Such illumination is typically produced using a direct-projected illumination source (e.g. light emitting diodes (LEDs)) that passes through a dif ⁇ user to generate the desired illumination effect.
- a direct-projected illumination source e.g. light emitting diodes (LEDs)
- LEDs light emitting diodes
- HAND HELD SYMBOLOGY READER ILLUMINATION DIFFUSER further teaches the use of particular colors for improving the illumination applicable to certain types of surfaces.
- the choice of bright field, dark field, direct or diffuse light is not intuitive to user for many types of surfaces and/or the particular angles at which the reader is directed toward them.
- a surface may appear to be best read using dark field illumination, but in practice, bright field is preferred for picking out needed details, especially at a certain viewing angle.
- the viewing angle is never quite the same from surface to surface (part-to-part) and some viewing angles be better served by bright field while other may be better served by dark field.
- the above-referenced patent applications contemplate the application of a plurality of illumination types to achieve the best image for a particular surface and viewing angle.
- the light pipes described in the above referenced patents may include a chamfered end to project dark field illumination via internal reflection. Refraction through the polished chamfered end also generates direct bright field illumination. The optical clarity of the light pipe and end tends to create a spotlight effect, in which each individual illumination source (red LEDs, for example) is clearly visible on certain surfaces (see Fig. 7 below). This controverts the typical goal of providing an even spread of illumination.
- a conical diffuser is employed to provide an overall source of direct diffuse illumination
- prior art devices are limited in their ability to spread light from a few individual illumination sources (LEDs, for example) throughout the diffuser surface, and then onto the subject as diffuse light.
- LEDs individual illumination sources
- the diffuse light tends to exhibit a characteristic, localized light spot and dark spot effect.
- Adding further illumination sources to the diffuse section may be limited both by space and the relative cost of illumination sources, particularly where relatively costly blue-colored LEDs are employed.
- prior art readers often include visual indicators located at their back, top or another surface that denote the current status of the reader (for example, power on/off, good read, error, bad read, ready, not-ready, etc.).
- Various information can be presented to the user via different color lights (red/green, for example) and/or via blinking patterns,
- small, rear-mounted or top-mounted indicators may be overlooked or present a distraction while the user tries to focus on the surface being read.
- a technique for more-conveniently integrating indicators with the user's main point of interest is highly desirable.
- This invention overcomes the disadvantages of the prior art by providing a plurality of novel features that can be applied variously to a reader to improve the illumination performance in both dark field/direct bright field and direct diffuse types of illumination. Further features allow for increased light pipe durability without increasing weight or size and better readability of status indicators by placing such indicators in proximity to the subject and significantly enlarging to overall size of the indicator.
- the light pipe is constructed from durable polycarbonate for increased shock resistance.
- the chamfered end of the light pipe is textured or frosted to further diffuse refracted light passing through the end so as to present a more even effect.
- the conical/tapered diffiiser within the light pipe is illuminated by a reflector with a white textured surface that reflects a plurality of rearward-directed (opposite the illumination and viewing direction) illumination sources back into the diffuser.
- the reflector can define a predetermined cross section that directs further light into the forwardmost, remote regions of the diffuser to generate a better overall spread of light and alleviate light and dark spotting effects.
- the textured surface on the chamfered light pipe end can be employed to better project indicator light.
- the textured surface can alternatively (or in addition) be applied to the exposed portion of the inner wall adjacent to the distal (forward) end of the pipe.
- the illumination sources are arranged in a ring at the inner end of the light pipe, and can be multi-colored sources that respond to the controller to project and appropriate color and/or blink in an appropriate pattern to indicate various conditions, such as read success or failure.
- the controller is adapted to provide these specialized indications between actual image acquisition, so that the image acquisition is properly illuminated.
- the controller can operate individual portions of the ring so that only correspond- ing portions of the light pipe perimeter are illuminated in a particular color (quadrants, for example) at a given time. Different quadrants may be simultaneously illuminated in different colors in one example.
- the light pipe defines a polygonal (for example rectangular) cross section (with the polygon being generally defined as at least four linear or non-linear sides, joined at corners (that may be rounded) to form a (typically) non- equilateral shape.
- the chamfered edge on each side is at a fixed angle and thus the differing length of the North-South versus East- West sides (in the case of a rectangle), generates two different distances for convergence of dark field rays, which increases depth of field.
- the polygon (rectangle) includes at least two pairs of opposing sides and the first pair of opposing sides has a length different than the second pair of opposing sides to generate two differing-distance convergence points for dark field rays.
- Fig. 1 already described, is a perspective view of a handheld scanning system with integrated illumination according to the prior art;
- Fig. 2 is a side cross section of a handheld scanning system that can be employed in connection with the teachings of this invention;
- Fig. 3 is a front view of the scanning system of Fig. 2;
- Fig. 4 is an exploded view of the illumination assembly and image sensor for the scanning system of Fig. 2;
- Fig. 5 is a somewhat schematic side cross section of the sensor and illuminator assembly for use with the scanning system of Fig. 2 detailing the path taken by various illumination types;
- Fig. 6 is a somewhat schematic side cross section of the light pipe of the illuminator assembly of Fig. 5 more particularly showing the projection of direct bright field illumination;
- Fig. 7 is a diagram showing an illumination effect in which individual illumination sources are projected onto a surface through a polished chamfered light pipe end;
- Fig. 8 is a fragmentary perspective view of the viewing end of the reader featuring the illumination assembly and having a textured surface on the chamfered light pipe end;
- Fig. 9 is a diagram showing an illumination effect achieved on a surface employing a textured chamfered light pipe end in accordance with an embodiment of this invention;
- Fig. 10 is a block diagram of the image processor and illumination control circuitry interacting with the sensor, trigger and illumination ring, featuring individual quad- rant control and multi-color illumination sources;
- Fig. 11 is a fragmentary perspective view of the viewing end of the reader showing the textured chamfered light pipe end illuminated in red as an indicator;
- Fig. 12 is a fragmentary perspective view of the viewing end of the reader showing the textured chamfered light pipe end illuminated in green as an indicator
- Fig. 13 is a fragmentary perspective view of the viewing end of the reader showing the textured chamfered light pipe end illuminated in red in predetermined quadrants and green in other predetermined quadrants as an indicator;
- Fig. 14 is a schematic side cross section of the , light pipe, difruser, illumination sources and reflector showing a predetermined reflector geometry so as to increase projection of light along remote regions of the diffuser;
- Fig. 15 is a somewhat schematic side cross section of the light pipe of the illuminator assembly detailing the draft angle provided to allow molding of the light pipe and showing an alternative placement of the diffusive surface at the distal end of the light pipe;
- Fig. 16 is a schematic diagram of a generalized shape for a rectangular cross section light pipe featuring representations of a North, South, East and West edge;
- Fig. 17 is a schematic representation of the convergence of dark field rays from the North and South edges of the light pipe of Fig. 16 showing a first distance thereto
- Fig. 18 is a schematic representation of the convergence of dark field rays from the East and West edges of the light pipe of Fig. 16 showing a first distance thereto;
- Fig. 19 is an exposed perspective view of a light pipe according to an alternate embodiment of this invention defining an elliptical cross section.
- Fig. 2 shows a cross sectional side view of an illustrative embodiment of the reader 200 according to the present invention.
- the imager 212 and an illumination board 214 are positioned on a shock-resistant mounting (not shown) within the housing 206.
- the processor module and related functional electronic com- ponents are mounted on a processor board 215.
- the grip portion 202 and the trigger 204 are functionally cooperative with the housing 206 and components of the processor board 215.
- the grip portion 206 includes a conveniently placed trigger 204 that can be actuated by a finger of the user to initiate the image acquisition and decoding function. More particularly, pressing the trigger causes all types and colors of illumination (as described for- ther below) to be simultaneously projected onto the subject of interest, and also causes corresponding acquisition of an image by the imager.
- the illumination board 214 supports a plurality of LEDs 310 that are red in this embodiment (a variety of colors can be used).
- the LEDs 310 are directed forwardly, toward the opening of the reader. These LEDs are positioned behind a passive light pipe' 244 that internally transmits light from the ring of LEDs 310 to a front end 230.
- the front end 230 includes a chamfered surface 232.
- Various examples of a light pipe for use with a reader or similar application are shown and described in U.S. Patent Application Serial No. 10/693,626, entitled LIGHT PIPE ILLUMINATION SYSTEM AND METHOD, by William H. Equitz, et al, the teachings of which are expressly incorporated herein by reference.
- the light pipe is formed from a transmissive/transparent substance.
- the light pipe is constructed from transparent polycarbonate (available under the trade name Makrolon from BASF of Germany, or alternatively Lexan® available from the General Electric Company). This substance can be injection-molded using a liquid resin that is formed into a desired shape as discussed further below.
- the transmitted light is reflected internally by the an- gled/chamfered surface 232 of the light pipe 244 to exit at a low angle toward the center optical axis 270.
- the refractive index of polycarbonate (approximately 1.49) is sufficient to achieve the degree of light transmission and internal reflection employed for dark field illumination in accordance with embodiments of this invention.
- the inner and/or outer wall surfaces of the light pipe 244 can be coated with opaque paint or another compound to prevent leakage of light into or out of the pipe.
- a shield 250 is also provided along the inner surface of the light pipe. One function of the shield 250 is to prevent transmission of diffuse light (described below) in to the light pipe. Another function is to redirect light transmitted from the reflector (see below) back into the diffuser.
- the ring of LEDs 310 acts to produce a red direct bright field effect along with the dark field effect through refraction of some light from the LEDs through the chamfered surface 232.
- the bright field illumination from the light pipe 230 tends not to interfere with the dark field illumination.
- the bright field illumination is available, however, for larger reading distances (> 25 mm between the end 230 and the surface). This is useful for easy-to-read codes, such as black-and-white printed labels.
- a separate bright field illuminator can be provided, and as described below. In fact, many available imagers include integral red bright field illuminators. In an alternate embodiment, a separate bright field illuminator can be provided in a discrete color, such as green.
- aiming LEDs 220 typically emitting green light
- aiming LEDs may be integral with the commercially available image employed herein.
- a tether cord 260 provides electrical power to the reader 200, as well as a communication transmission path for the decoded character string of the encoded information, though it is contemplated that the reader 200 can be configured with battery power and wireless communication for complete portable flexibility.
- a front view of the reader 200 is shown.
- the distri- bution and placement of the individual LEDs (or other appropriate light elements) 310 that transmit light to the light pipe 244 is represented by a series of adjacent Xs positioned around the perimeter of the light pipe 244 in line with the distal end 230.
- the illustrative LED placement creates a generally uniform lighting effect.
- the placement of these light elements and others used herein is highly variable.
- the addressing of light elements can be controlled so that only certain elements are activated at certain times to create the desired overall dark field illumination intensity and/or bias (e.g. lighter on one side than another) to the dark field illumination effect on the subject. This variable-addressing feature is described further below and is discussed in further detail in the above-incorporated U.S. Patent Applications and in other commonly assigned U.S. Patent Applications referenced therein.
- the imager 212 resides at the left side of the view.
- the illumination board assembly 214 is located ahead of it. Placed in front of the illumination board 214 and LEDs 310 is the proximal (or base) end 410 of the light pipe 244, which receives transmitted light from the LEDs 310, and internally transmits it to the chamfered distal end 230.
- a tapered (also loosely termed "conical") diffuser 280 (refer also to Fig.
- this diffuser 280 can be constructed from a thin (1 -3 millimeter) polymer material with a frosted/textured interior.
- a thin shield 250 is provided against the interior of the light pipe to block the diffuser's transmitted light from entering the light pipe 244. In this manner, the light emitted from the diffiiser does not mix with the light pipe's transmission.
- Space may be limited in the region between the shield 250 and the inner surface of the diffuser 280.
- use of a smaller number of such LEDs is highly desirable.
- the light projected by the diffuser is provided by a set of (four) rearward-projecting LEDs 282 mounted on the illumination board 214 on a side opposite the ring of light pipe LEDs 310.
- These LEDs 282 project rearward into a conical, spherical, parabolic (or other shape) reflector 290 that spreads the reflected light throughout the inner surface of the diffuser 280 so that it exits as a substantially uniform spread of direct, diffuse light onto the surface of inter- est.
- the reflector's shape can be optimized to improve the spread of light along the conical diffuser.
- the reflector 290 is constructed from polymer with a white textured surface to further diffuse the light reflected therefrom.
- This indirect projection'of light with a diffusing reflective surface sig- nificant ly aids in reducing the number of diffuse illumination LEDs 282 employed to project the diffuse illumination, thereby reducing production costs and power consumption.
- the diffuse illumination LEDs 282 are high-output blue LEDs.
- the particular colors used for each type of illumination are highly variable.
- a translucent "conical” filter 292 is provided.
- the filter 292 is adapted to filter out light with larger wavelengths, thereby allowing smaller wavelength blue light to pass out of the diffuser and onto the surface, but preventing the retransmission of any reflected red light from the surface, which would otherwise tend to become retransmitted as diffuse red light along with the red dark field illumination.
- the wavelength spread between red light and blue light is sufficient to accomplish this filtering without compromising the performance of either type (dark field/direct bright field versus direct diffuse) of illumination.
- the filter 292 conforms to the shape of the diffuser's outer (exposed) surface, and can be snapped or adhered onto the diffuser surface using a variety of fastening techniques that should be clear to those of ordinary skill.
- a similar effect can be obtained through the use of a colored diffuser (see Fig. 6 below).
- the color should be selected so that the diffuser transmits the diffuse light (blue in this embodiment), but does not reflect the dark field light (red in this embodiment) transmitted from the light pipe.
- each discrete set of transmitters 282 and 310 generates a corresponding dis- crete illumination color.
- direct diffuse illumination can be generated by blue LEDs and dark field (and direct bright field) can be generated by red LEDs.
- red LEDs can be generated by red LEDs.
- the imager in this embodiment includes a conventional monochrome sensor that produces a grayscale image from the colored light.
- a color sensor can be employed.
- One such implementation is shown and described in commonly assigned U.S. Patent Application entitled SYSTEM AND METHOD FOR EMPLOYING COLOR ILLUMINATION AND COLOR FILTRATION IN A SYMBOLOGY READER by Laurens W. Nunnink, and filed on even date herewith, the teachings of which are expressly incorporated herein by reference.
- FIG. 5 a cross section of an implementation of the diffuser 280 is shown, with light pipe 244 as described generally above, relative to the imager assembly 212 (and associated lens structure 240).
- Dark field illumination (rays 510) is directed into the light pipe 244 that is internally reflected at the chamfered distal (forward) end 230 to be, thus, directed at the object surface 520 at a low angle.
- Direct illumination (rays 532) from blue LEDs 282 is converted into totally diffuse direct illumination by reflection off the reflector 290, and passage into and through the diffuser 280 of this embodiment.
- the dif ⁇ user 280 thereby projects diffuse illumination on the object surface 520 within the field of view, depicted as the region defined by dashed lines 540.
- the dif ⁇ user 280 is, itself, translucent, without a color tint or color- filtering effect.
- the dif ⁇ user can be tinted to generate a desired color and/or act as a filter (using colored or white illumination sources (282)).
- the diffuser 280 can be constructed and arranged so as to be removably attached to the hand held scanning appliance.
- the diffuser can be removed to allow the transmitters 282 to operate as non-diffuse direct bright field illumination.
- the diffuser can be provided with movable shutters that selectively expose clear (non- frosted/no ⁇ -diffusing) windows in the overall difruser.
- the removability of the diffuser 280 can be achieved by incorporating snap-fit clearances and/or features in the diffuser and light pipe 242 that permit removable assembly (not shown).
- direct non-diffuse bright field illumination (see rays 620 in Fig. 6) is provided by refraction of light through the chamfered end 230 of the light pipe 244.
- a portion of the light internally reflected along the pipe 244 exits directly from the chamfered end 230 as relatively high-angle (usually greater than 45 degrees relative to the axis surface 520) bright field light (rays 620).
- the remaining light is internally reflected by the chamfered end 230 to exit adjacent to the inner corner 630 of the pipe 244 as discussed generally above.
- the light pipe can be modified in alternate embodiments to include a flattened ring (residing in a plane perpendicular to the axis 270.
- a nested light pipe with a flat (un- chamfered) ring formed at its distal end can be used in alternate embodiments for direct transmission of bright field light along a waveguide separate from the depicted dark field light pipe 244. This can be useful where illuminators having a discrete color are used for direct bright field light.
- direct bright field transmitters are ⁇ employed they can be located so as to project light through clear/transparent portions (not shown) of the diffuser 280.
- a filter (292 above) may be applied over the diffuser to prevent migration of reflected dark field (and bri ght field) light into the diffuser 280.
- illuminator light pipes include a polished distal end.
- Fig. 7 an image 710 acquired of a reflective surface using a light pipe with a polished end is shown. This image 710 clearly depicts delineated spots 720 produced by the individual illumination sources in the illumination ring. These spots lead to a somewhat broken illumination pattern that may effect acquisition of the mark 730.
- the reader 200 is fitted with an illumination assembly 800 that includes a light pipe 810 according to an embodiment of this invention.
- the light pipe 810 includes a light pipe 810 according to an embodiment of this invention.
- a chamfered end 820 about its forward perimeter having a general size and shape as described above.
- the depicted outer surface 830 of the chamfered end 820 is finely frosted or textured. This provides a mild diffusive effect to light exiting as direct bright field illumination (see Fig. 6) and also to internally reflected light exiting as dark field illumination. The resulting diffusion generates the image shown in Fig. 9. o Note that the ring of light 920 surrounding the mark 930 is more uniform and the mark, itself, appears better contrasted than the results of the polished-end version shown in Fig. 7.
- the frosted or textured surface 830 provided along the chamfered end facilitates a novel and desirable display of reader status according to an embodiment of this invention.
- the circuit board (215 in Fig. 2) of the reader includes a processor and illumination controller, shown schematically as processor/control block 1010.
- the processor/control 1010 can employ conventional image processing and mark- 0 recognition/decoding processes.
- the processor/control 1010 receives signals from the trigger (block 1012), which are used to operate the illumination assembly and to obtain image date via the imager (block 1014).
- the aiming LEDs (block 1016 and see also 220 in Fig.
- acquisition of the image involves a stepping through of a plurality of illumination types (dark field and diffuse) in timed sequence, with associated image acquisition of the mark during each type of illumination.
- illumination types dark field and diffuse
- the best image or a combination of the images
- the reader may indi- cate a variety of status codes, such as ready-to-read, read successful, read unsuccessful, etc. These indicators are described further below.
- the processor 1010 directs the illumination ring (block 1020) to illuminate. It then directs the diffuse illuminator (block 1018) to illumi- nate.
- the ring 1020 can include individual banks of LEDs (or other illumination sources) that, in this example, are formed into quadrants — namely top/north 1022, bottom/south 1024, right/east 1026 and left/west 1028 (as viewed from outside, toward the reader front). These quadrants can be individually addressed by the processor. This allows the output of each quadrant to be varied so as to generate the desired effect on the object.
- the individual illumination sources are commercially available multi-color LEDs (red and green in this embodiment, denoted schematically by the split line down the middle of each LED 1030), capable of projecting either of two colors in response to the processor 1010.
- This can be useful, form an imaging standpoint, where a different color is to be provided for dark field and direct bright field.
- the illu- mination ring's multicolor capability allows the light pipe (particularly the frosted end 820) to project a highly visible, subject-adjacent indicator light in a plurality of colors.
- Fig. 11 details generally the illumination of the light pipe 810 for the purpose of providing the user an indicator.
- the four quadrants 1110, 1120, i 13 ⁇ W ⁇ 1140 of the textured chamfered edge 820 are illuminated red (denoted by the encircle * ⁇ R's) by their appropriate banks of LEDs in the ring.
- the frosted surface in fact generates a bright, diffuse color strip that enhances viewing of the indicator.
- This indicator can be illuminated before, during or after image acquisition as a continuous or blinking signal.
- Blinks can be timed in the manner of Morse code to achieve a desired status message.
- all light-pipe-end quadrants 1110, 1120, 1130, 1140 are illuminated in green (denoted by the encircled G's).
- This can be a solid (continuously green) or blinking indicator. It can also blink alternatively with red (or another color) according to any predetermined pattern to provide a particular message.
- the indicator is characterized by two (or more) simultaneous colors displayed by different quadrants (or other sections) of the light pipe edge.
- the top quadrant 1110 is red and the left quadrant 1140 is green.
- the opposed bottom and left quadrants 1120 and 1130, respectively, may also be red and green. This pattern may blink, or alternate (e.g. red and green switch).
- a unique rolling change of colors may occur in which each quadrant, in turn changes to a different color so that the color change appears to migrate around the perimeter. Any observable and desirable shift of colors is contemplated as an indicator according to this invention.
- Fig. 14 shows a variation of the above- described reflector shape.
- the length and angle (A) of the conical diffuser 280 (typically less than 45 degrees with respect to the axis 270 in each quadrant) defines a remote, distal region 1410 between the interior wall of the diffuser 280 and the shield 250 that is small in volume and difficult for light from the reflector 1420 to fill adequately.
- the gap between the inner perimeter of the illumination board 214 and the interior wall of the diffuser further obscures transmission of light into this remote region 1410.
- the reflecting surface 1422 of the reflector 1420 of this embodiment includes a plurality of steps 1424, 1426, 1428, 1429 which are designed to direct specific portions of the reflected light (rays 1430) from the LEDs 282 toward the various parts of the diffuser, including the remote regions 1410.
- the plurality of small, angled steps 1429 formed in the cross section are particularly adapted to transmit rays 1430 from the light sources 282 to various points along the remote region 1410 for an optimized spread of light along the entire diffuser surface.
- the reflector 1420 in this embodiment also includes a textured surface and a white surface color for maximum diffusion. In alternate embodiments, a different surface color and surface finish can be' em- 5 ployed. In this manner a more-uniform illumination of the complete diffuser surface is achieved, and the presence of light and dark spotting on the object is minimized.
- stepped reflector 1420 is shown and described according to an embodiment of this invention, it is expressly contemplated that reflectors having a variety of surface cross-sectional profiles can be employed in alternate embodiments. Such reflectors o should be adapted, using optical-focusing techniques, to spread light along the length of a tapered or conical diffuser of a shape generally contemplated herein so as to avoid undesirable spotting on localized regions of the surface of interest.
- a light pipe with a textured or frosted chamfered end can be produced by a variety of s techniques including grit blasting or peening of a finished surface, a desirable construction technique entails molding of the light pipe from poured resin.
- the chamfered end is located near the bottom of the mold and the rearward end (adjacent to the illumination ring) is located at the top of the mold, at which location the finished pipe is ejected from the mold.
- the bottom of the mold is provided with a frosted or textured pattern so as to 0 form this surface effect on the chamfered end of the finished pipe. Referring to Fig.
- the mold is constructed with a slight draft angle that tapers, so that the resulting light pipe 244 defines a pair of inner walls having a draft angle AD therebetween of approximately at least 2 degrees (each side being 1 degree relative to the axis 270). Because the mold includes a frosted/textured sur- s face, the draft angle is set at approximately 2 degrees, rather than the typical 1 degree for a smooth molded part. This 2-degree draft angle better overcomes the possible adhesion effects created between the finished pipe and the textured mold surface. This draft angle is employed where the texture is applied to the chamfered ends 230.
- chamfered ends 230 each define therebetween an angle of approximately 70 degrees (each end o being approximately 35 degrees relative to the axis 270). It should be clear, however, that the techniques used for forming the light pipe and other components herein can vary within the scope of ordinary skill.
- the frosted or textured finish can be applied to the inner wall of the light pipe 244 at the end location 1520.
- This location 1520 is exposed beyond the distal end of the diffuser 280 and shield 250 described above to allow unobstructed passage of dark field light (rays 510). This causes the reflected dark field light to pass through a diffusive structure prior to striking the mark surface.
- the textured surface can also be applied to the outer side (location 820) in an embodiment of the invention.
- the textured surface may be selectively applied to only one of the inner location ( 1520) or outer location (820 ⁇ as appropriate.
- the deeded draft angle AD Fig. 14
- An appropriate draft angle can be determined by those of skill in the molding plastic parts.
- the general cross sectional pe- rimeter shape of the light pipe is rectangular (taken on a plane through axis 270).
- the term "rectangular" shall include minor deviations of the sides of the rectangle from a straight-line geometry.
- a rectangular shape herein may include, for example, curvilinear arcs as shown and described.
- the term rectangular shall be defined generally as a set of linear of non-linear sides that inter- sect at each of four corners (that may be significantly rounded corners) that cause the approximate direction of two adjacent sides to vary by approximately ninety degrees.
- a highly generalized representation of a rectangular light pipe 1610 is shown in Fig. 16.
- the sides 1620, 1622, 1624 and 1626 of the rectangular light pipe 1610 can be defined in terms of North (arrow N), South (arrow S), East (arrow E) and West (arrow W).
- each edge of the distal, chamfered end can be correspondingly represented as EN (edge North), ES (edge South), EE (edge East) and (EW (edge West).
- EN edge North
- ES edge South
- EE edge East
- EW edge West
- the length LNS between the North edge EN and South edge ES is shorter (in this embodiment) that the length LEW between the East edge EE and West edge EW (LNS ⁇ LEW). Note that in alternate embodiments the reverse may be true (LNS > LEW) or these measurements can be approximately equal. Referring to Figs.
- the chamfered edge along each side is disposed at the same fixed angle (approximately 55 degrees in this embodiment), generating dark field light rays that converge at point 1710 at an average fixed angle ⁇ of approximately 32 degrees (representing half the chamfer angle along with an induced draft angle of 1 degree and further refraction as the light exits the pipe interior wall).
- the distance LNS is less than the distance LEW
- the convergence distance of light DNS for the pair of opposing sides EN and ES is less than the convergence distance DEW of light from the pair of opposing sides EE and EW.
- this arrangement affords a wider depth of field for the reader by providing two differing distance ranges of illumination for the mark.
- the approximate length NS is 3 cm
- the approximate length EW is 4.5 cm.
- DNS is approximately .92 cm
- DEW is approximately 1.23 cm.
- the above- described rectangular light pipe shape presents several advantages over round light pipes and those of other regular, equilateral shapes.
- the rectangular shape more closely conforms to the conventional 4:3 horizontal-to-verticarratio exhibited by commercially available sensors.
- the rectangular cross section yields a larger dark field range than provided by round pipes. It also allows for a lower-profile reader, in terms of overall height.
- the use of discrete "sides" on the pipe makes it easier to control separate quadrants, as described above.
- Fig. 19 details an elliptical cross section light pipe 1910 that can be adapted for use with an embodiment of the invention (with appropriate reshaping of the illumination ring and diffuser, where applicable.
- the distal end of the light pipe 1910 terminates in a chamfered end 1920 having an angle and function as generally described herein.
- the edge of the chamfered end in essence defines an opposing pair of North and South sides (1930 and 1932, respectively) and East and West sides (1940 and 1942, respectively), which are separated by distances that differ.
- the distances are the minor axis MIA and the major axis MAA (respectively) of the ellipse.
- the "sides" can be characterized as continuously running into each other with arbitrary boundaries or with “continuously curving corners.” A variety of variations on this basic elliptical shape are expressly contemplated. In any case, the sides generate at least two discrete distances of ray convergence for a given fixed chamfer angle.
- top and right may always work together or top and bottom may always work together.
- additional ring colors such as yellow can be employed to provide further types of indicators.
- Multi-colored illumination sources or a plurality of adjacent individual illumination sources (or combinations of individual and multi-colored sources) can be used to generate the desired seat of ring colors.
- a greater range of depth of field may be obtained by providing a non-equilateral shape having more than four sides joined by corners (for example, an oblique hexagon).
- This invention contemplates polygonal light pipe cross sections having four or more sides (linear or curvilinear) joined at corners ' (that may be rounded).
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
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Abstract
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Priority Applications (3)
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DE112006002867T DE112006002867T5 (en) | 2005-10-24 | 2006-10-19 | Integrated illumination arrangement for a symbol reader |
CN2006800486668A CN101346729B (en) | 2005-10-24 | 2006-10-19 | Integrated illumination assembly for symbology reader |
JP2008537812A JP5102215B2 (en) | 2005-10-24 | 2006-10-19 | Built-in lighting assembly for symbolology reader |
Applications Claiming Priority (2)
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US11/257,411 US7874487B2 (en) | 2005-10-24 | 2005-10-24 | Integrated illumination assembly for symbology reader |
US11/257,411 | 2005-10-24 |
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WO2007050454A2 true WO2007050454A2 (en) | 2007-05-03 |
WO2007050454A3 WO2007050454A3 (en) | 2007-08-02 |
WO2007050454A9 WO2007050454A9 (en) | 2008-05-29 |
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PCT/US2006/041041 WO2007050454A2 (en) | 2005-10-24 | 2006-10-19 | Integrated illumination assembly for symbology reader |
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US (2) | US7874487B2 (en) |
JP (1) | JP5102215B2 (en) |
CN (2) | CN102419814B (en) |
DE (3) | DE112006004282A5 (en) |
HK (1) | HK1169504A1 (en) |
WO (1) | WO2007050454A2 (en) |
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Also Published As
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US9405951B2 (en) | 2016-08-02 |
CN101346729A (en) | 2009-01-14 |
US20070090193A1 (en) | 2007-04-26 |
DE112006004282A5 (en) | 2016-01-28 |
CN102419814B (en) | 2015-04-22 |
JP2009512957A (en) | 2009-03-26 |
DE112006004283A5 (en) | 2016-01-28 |
WO2007050454A3 (en) | 2007-08-02 |
CN101346729B (en) | 2011-11-23 |
HK1169504A1 (en) | 2013-01-25 |
US7874487B2 (en) | 2011-01-25 |
WO2007050454A9 (en) | 2008-05-29 |
JP5102215B2 (en) | 2012-12-19 |
DE112006002867T5 (en) | 2008-10-30 |
CN102419814A (en) | 2012-04-18 |
US20110080729A1 (en) | 2011-04-07 |
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