CN102180025A - Method for changing view field of laser marking machine - Google Patents
Method for changing view field of laser marking machine Download PDFInfo
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- CN102180025A CN102180025A CN2011100243917A CN201110024391A CN102180025A CN 102180025 A CN102180025 A CN 102180025A CN 2011100243917 A CN2011100243917 A CN 2011100243917A CN 201110024391 A CN201110024391 A CN 201110024391A CN 102180025 A CN102180025 A CN 102180025A
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- laser marking
- galvanometer
- marking machine
- upper limit
- lens
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Abstract
The invention provides a method for changing the view field of a laser marking machine by changing the upper limit of a swing angle of a vibrating mirror system. The upper limit of the swing angle in an X direction is reduced, and the upper limit of the swing angle in a Y direction is increased. The method has the advantages that: the practice that a lens is needed to be replaced to form a larger scanning area so as to mark a rectangular view field by all laser marking machines at present is changed. By the method, cost is not required to be increased to replace the lens or a laser on various occasions, and the marking speed cannot be reduced.
Description
Technical field
The present invention relates to the laser application field, particularly a kind of laser marking machine, this laser marking machine are adapted to the two long sentence shape marks to triplex row.
Background technology
At present, most laser marking machines all adopt X, Y two-dimension optical vibration mirror scanning head on the market, and wherein first galvanometer motor drives the beam flying that a reflective mirror forms directions X, and second reflective mirror then leads, drive by second galvanometer motor, form the Y scanning direction.Wherein X and Y direction are orthogonal.Light beam enters condenser lens through the scanning of X and Y direction, also is called f-θ lens.These lens focus the light beam in a bit, realize the mark function under computer software control.
The characteristics of f-θ lens are that the distance that its focus point leaves the visual field initial point is exactly the product of its focal length (f) and scanning angle (θ).This relation is zero-order approximation just, must adopt software to proofread and correct in the practicality and realize accurate and practical mark.
The visual field and the focal distance f of laser marking machine are directly proportional, and the energy density and the f of laser marking are inversely proportional to.Like this, need big mark visual field will select big focal length, make mark speed reduce simultaneously.If just can not reducing, mark speed must increase laser power.
Effective mark visual field of laser marking machine is subjected to the restriction of f-θ lens following factors: 1, the optical parallax when wide-angle incident, be called for short declination error; 2, the optical parallax that is caused during the BEAM SQUINT lens centre is called for short stand-off error.
Above-mentioned optical parallax makes away from the focal beam spot disperse of initial point, causes optical energy density to be lower than near the hot spot of initial point, the deleterious of laser marking, and the drift angle is also big more with the big more relative error of off normal.Therefore for each f-θ lens certain angular range is arranged, this angular range has just been determined the scope of mark visual field.Product in the market all is tetragonal mark visual field, because the scanning angle limit of bidimensional X and Y galvanometer all is the same.
The error of directions X because the distance from the X galvanometer to f-θ lens is longer under the situation of both same angle limits, causes the off normal of directions X bigger greater than the Y direction.
Most of marks are used, on-line marking particularly, what all need is rectangular mark visual field, and two, the long sentence of triplex row is in the great majority.For example the character of similar Fig. 2 is of common occurrence in the mark of food, medicine packing: wherein the height a of character string is less than 1/3rd of its length b.Need can only in existing commercial lasers mark product, select the specification product of mark visual field the client who uses laser marking machine for one greater than b Xb.Be not best technical combinations like this, because the height potential of mark has only been used less than 1/3rd.And, have to select for use the field lens of big working region, thereby cause waste in order to satisfy the long character string of mark.
Summary of the invention
Can not give full play to the deficiency of potential in order to overcome present laser marking machine, the invention provides a kind of laser marking machine visual field is rectangle, and can accomplish length than roomy a lot of method, and discloses a kind of such mark machine.
The technical scheme that the present invention adopts in order to realize its technical purpose is: a kind of method that changes the laser marking machine visual field, this method is to realize by the pendulum angle upper limit that changes galvanometer system, the pendulum angle upper limit of X-direction is reduced, with the pendulum angle upper limit increase of Y-direction.
Concrete, in above-mentioned a kind of method that changes the laser marking machine visual field: the pendulum angle upper limit that changes galvanometer system is to finish by the maximum current of restriction input galvanometer motor, promptly reduce the maximum current of X-direction galvanometer motor, increase the maximum current of Y-direction galvanometer motor.
The invention has the beneficial effects as follows: change that at present all laser markings are confidential to be got the rectangular sound of looking and all need to change lens to reach the way in the zone of more exposing thoroughly.Use method of the present invention, just do not need to increase cost in a lot of occasions and change lens or laser instrument, also need not sacrifice mark speed.
Below in conjunction with the drawings and specific embodiments the present invention is done comparatively detailed description.
Description of drawings
Fig. 1 is the visual field schematic diagram of present laser marking machine.
Fig. 2 is a kind of common on-line marking example at present.
Fig. 3 is the visual field schematic diagram by laser marking machine after this method transformation.
The specific embodiment
Embodiment one
The present invention is a kind of under the situation of the structure that does not change laser marking machine and each parts, and the visual field of laser marking machine is transformed into rectangle to be adapted to the needs of present common on-line marking by square.This method is to be to finish by the maximum current of restriction input galvanometer motor by the pendulum angle upper limit that changes galvanometer system, promptly reduces the maximum current of X-direction galvanometer motor, increases the maximum current of Y-direction galvanometer motor.By changing the pendulum angle upper limit of galvanometer system, the pendulum angle upper limit of X-direction is reduced, the visual field that the pendulum angle upper limit increase of Y-direction is made laser marking machine changes over rectangle as shown in Figure 3 by as shown in Figure 1 square, is fit to mark example as shown in Figure 2.
The method of present embodiment does not need to change any characteristic of f-θ lens, the pendulum angle upper limit that only needs to change galvanometer gets final product, be that the deflection maximum angle of two galvanometers is the same in the present galvanometer system, therefore scanning area is a square, and this invention requires the maximum deflection angle of two galvanometers different, an increase, another one reduces, thereby makes that scanning area is a rectangle.
Though all at present lens can the mark rectangle, the length in maximum scan zone is shorter than the length in the maximum scan zone of using this inventive method to produce, and that is to say, needs to change lens to reach the zone of more exposing thoroughly.And mark speed and precision are sacrificed in the inevitable side effect of lens of changing bigger visual field exactly, or must adopt expensive more laser instrument and galvanometer.Use method of the present invention, just do not need to increase cost in a lot of occasions and change lens or laser instrument, also need not sacrifice mark speed.
The method of control galvanometer motor hard-over is the maximum current that limits this electrode of input.The hard-over of present commercial galvanometer motor does not use the limit as yet in laser marking machine, therefore the potentiality that increase corner are arranged.
Because Y-galvanometer corner increases, so the galvanometer width needs to increase, because the galvanometer corner of X-direction reduces, so the length of Y-galvanometer can reduce simultaneously.In view of this Y-galvanometer rotary inertia can be accomplished not change basically.
Because X-galvanometer corner reduces, so the galvanometer width can reduce, so the X-rotary inertia reduces to some extent.In addition, respectively have under the situation of increase and decrease at two galvanometer width, the distance of two galvanometer motors can remain unchanged.
Claims (2)
1. method that changes the laser marking machine visual field is characterized in that: change the pendulum angle upper limit of galvanometer system, the pendulum angle upper limit of X-direction is reduced, the pendulum angle upper limit of Y-direction is increased.
2. the method for change laser marking machine according to claim 1 visual field, it is characterized in that: the pendulum angle upper limit that changes galvanometer system is to finish by the maximum current of restriction input galvanometer motor, promptly reduce the maximum current of X-direction galvanometer motor, increase the maximum current of Y-direction galvanometer motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100243917A CN102180025A (en) | 2011-01-21 | 2011-01-21 | Method for changing view field of laser marking machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100243917A CN102180025A (en) | 2011-01-21 | 2011-01-21 | Method for changing view field of laser marking machine |
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| CN102180025A true CN102180025A (en) | 2011-09-14 |
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| CN2011100243917A Pending CN102180025A (en) | 2011-01-21 | 2011-01-21 | Method for changing view field of laser marking machine |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5521628A (en) * | 1993-08-30 | 1996-05-28 | Lumonics Corporation | Laser system for simultaneously marking multiple parts |
| CN2557432Y (en) * | 2002-03-22 | 2003-06-25 | 武汉波富信息有限公司 | High-speed laser mark-making machine |
| JP2005014089A (en) * | 2003-05-30 | 2005-01-20 | Central Glass Co Ltd | Laser marking method |
| JP2005262229A (en) * | 2004-03-16 | 2005-09-29 | Shibaura Mechatronics Corp | Laser marking apparatus and method therefor |
| JP2007301610A (en) * | 2006-05-12 | 2007-11-22 | Y E Data Inc | Laser beam machining method and laser beam machining apparatus |
| CN201021952Y (en) * | 2007-02-09 | 2008-02-13 | 耿学红 | A laser marker for tobacco packing code |
| DE102006037922A1 (en) * | 2006-08-11 | 2008-02-14 | Edgar Sauer | Laser beam marking assembly for food or food packaging directs beam through separate paths to overlapping target zones |
| CN201300588Y (en) * | 2008-11-28 | 2009-09-02 | 华南理工大学 | High-speed galvanometric scanner type online laser coding machine for metal parts |
| CN201394960Y (en) * | 2009-05-21 | 2010-02-03 | 北京航天光华电子技术有限公司 | Full automatic laser marking machine |
-
2011
- 2011-01-21 CN CN2011100243917A patent/CN102180025A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5521628A (en) * | 1993-08-30 | 1996-05-28 | Lumonics Corporation | Laser system for simultaneously marking multiple parts |
| CN2557432Y (en) * | 2002-03-22 | 2003-06-25 | 武汉波富信息有限公司 | High-speed laser mark-making machine |
| JP2005014089A (en) * | 2003-05-30 | 2005-01-20 | Central Glass Co Ltd | Laser marking method |
| JP2005262229A (en) * | 2004-03-16 | 2005-09-29 | Shibaura Mechatronics Corp | Laser marking apparatus and method therefor |
| JP2007301610A (en) * | 2006-05-12 | 2007-11-22 | Y E Data Inc | Laser beam machining method and laser beam machining apparatus |
| DE102006037922A1 (en) * | 2006-08-11 | 2008-02-14 | Edgar Sauer | Laser beam marking assembly for food or food packaging directs beam through separate paths to overlapping target zones |
| CN201021952Y (en) * | 2007-02-09 | 2008-02-13 | 耿学红 | A laser marker for tobacco packing code |
| CN201300588Y (en) * | 2008-11-28 | 2009-09-02 | 华南理工大学 | High-speed galvanometric scanner type online laser coding machine for metal parts |
| CN201394960Y (en) * | 2009-05-21 | 2010-02-03 | 北京航天光华电子技术有限公司 | Full automatic laser marking machine |
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Application publication date: 20110914 |