CN101833960A - Servo system for adjusting position of origin of optical axis for laser head assembly - Google Patents
Servo system for adjusting position of origin of optical axis for laser head assembly Download PDFInfo
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- CN101833960A CN101833960A CN200910105742A CN200910105742A CN101833960A CN 101833960 A CN101833960 A CN 101833960A CN 200910105742 A CN200910105742 A CN 200910105742A CN 200910105742 A CN200910105742 A CN 200910105742A CN 101833960 A CN101833960 A CN 101833960A
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Abstract
The invention relates to a servo system for adjusting the position of the origin of an optical axis for laser head assembly, which comprises a laser head holder, a photoreceptor, a laser signal position comparer, and a position adjusting device, wherein the laser head holder is used for fixing a laser head to be adjusted; the photoreceptor is arranged on the laser head holder and is used for inducting a laser signal emitted by the laser head; the laser signal position comparer is in signal connection with the photoreceptor; the position adjusting device is connected with the laser signal position comparer and is used for adjusting the position of the origin of the optical axis of a sensitive component of the laser head to be adjusted; and the laser signal position comparer is a programmable logic operation device in which a comparison program is arranged, and outputs a comparison signal to the position adjusting device so as to control the position adjusting device to drive the sensitive component to be adjusted to move. The servo system for adjusting the position of the origin of an optical axis for laser head assembly has the advantages of automatically completing the process of adjusting the position of the origin of the optical axis of the sensitive component, guaranteeing the correction precision, and overcoming the defects of poor consistency and high defective percentage in manual adjustment.
Description
Technical field
The present invention relates to laser head and make the rigging equipment field, relate in particular to a kind of servo system for adjusting position of origin of optical axis for laser head assembly.
Background technology
Laser head mainly comprises: laser generator (claiming laser diode again), semi reflective prism, object lens, these several parts of lens and photodiode.When laser head read data on the disc, the laser that sends from laser generator saw through the half reflection prism, converges on the object lens, and object lens become ultrafine luminous point with laser focusing and get on the CD.At this moment, the light that the reflecting material on the CD will be come irradiation reflects back, and sees through object lens, shines on the half reflection prism again.At this moment, because prism is semi-reflective structure, therefore can not allow light beam penetrate it fully and get back on the laser generator, but, pass lens, arrive above the photodiode through reflection.Because being the point with the projection injustice, optical disc surface comes record data, so the light that reflects will the different direction of directive.People are " 0 " or " 1 " with the signal definition of directive different directions, light emitting diode receives be those with " 0 ", data that arrange " 1 ", and their are resolved and become our needed data the most at last.
Dress cuts object lens and makes lens driver that object lens drive in tracking direction and focus direction etc. on metal or resinous frame, also loads photo-sensitive cells such as LASER Light Source element and photodiode simultaneously on this frame; For optical elements such as laser diode or photodiode are loaded in make mostly on the frame first by bonding agent to the be adhesively fixed method of optical element of frame.When making in this way, after a plurality of local adhesive-applying of optical element or frame becomes point-like, adjust the position relation of optical element and frame, or after adjusting the position relation of optical element and frame, a plurality of places between optical element and frame make bonding agent solidify with the point-like adhesive-applying then.
Like this, for optical element is adhesively fixed on the frame, be necessary to make the optical axis position of optical element and focal position to overlap, should after adjusting the position of optical element to frame, three-dimensional be adhesively fixed, in such occasion, optical element should be adhesively fixed with the state that only floats specified gap from frame.As the used bonding agent that is adhesively fixed like this, in ultraviolet curing bonding agent (the following UV that cries solidifies sticker), as using curable, then most convenient immediately.
Be called as Chinese invention patent publication number " CN03106419.1 " name " manufacture method of adhering method and optical-head apparatus " patent disclosure the manufacture method of a kind of adhering method and optical-head apparatus, a kind of adhering method, it is characterized in that, when being adhesively fixed the 1st member and the 2nd member to reserve specified gap with bonding agent, apply the state of above-mentioned bonding agent at described the 1st member or above-mentioned the 2nd member, this bonding agent has the slow open country shape of overflowing of volcano descending; But in the time of before using the ultraviolet curing bonding agent that optical element is bonded in frame, the origin of optical axis position that must correct optical element makes it overlap with the focal position, so before bonding, need the position of optical element on frame adjusted, but the step of this adjustment origin of optical axis position is often by manually finishing in the prior art, and what cause this step finishes that consistance is poor, defect rate is higher.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of automaticity height, corrects the high adjustment optical element origin of optical axis positional servosystem of degree of accuracy.
The present invention is achieved through the following technical solutions:
A kind of servo system for adjusting position of origin of optical axis for laser head assembly of the present invention,
It comprises: be used for fixing the laser head fixed mount of laser head to be adjusted,
Wherein, also comprise: be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis to be adjusted position with this laser signal position comparer, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, this laser signal position comparer output comparison signal is controlled this position regulator and is driven photo-sensitive cell to be adjusted and move to described position regulator; This kind servo system for adjusting position of origin of optical axis for laser head assembly, owing to adopt to be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, make the process automation of adjusting optical element origin of optical axis position finish, make the degree of accuracy of correcting be guaranteed, the consistance that has overcome manual setting is poor, the problem that defect rate is high.
Further, described position regulator comprises: the vacuum slot that is used to locate described laser head photo-sensitive cell to be adjusted position, be connected with this vacuum slot, be used to drive the X platform of this vacuum slot, be connected, be used to drive the Y platform of this vacuum slot with this vacuum slot along photo-sensitive cell optical axis normal plane Y direction to be adjusted translation along photo-sensitive cell optical axis normal plane X-direction to be adjusted translation.
Further, described position regulator comprises: the micromatic setting that is connected, is used to adjust this vacuum slot angle with described vacuum slot; Can revise the vector angle position of adjusting vacuum slot by this micromatic setting is set, and then adjust the vector angle position of photo-sensitive cell to be adjusted.
Further, described position regulator comprises: the height control slide block that is connected, is used to adjust described vacuum slot relative altitude position with described micromatic setting; Can adjust the relative altitude position of photo-sensitive cell by this height control slide block is set, and then adjust laser head forms focus (circle hot spot) on photo-sensitive cell to be adjusted size.
Further, described X platform comprises X platform servomotor, and described Y platform comprises Y platform servomotor.
Further, described photo-sensitive cell to be adjusted is the four-quadrant photo-sensitive cell, and this four-quadrant photo-sensitive cell is made up of four square sensitization quadrants, and described four square sensitization quadrants are first quartile A, the second quadrant C, third quadrant B, four-quadrant D.
Further, described laser signal position comparer is single-chip microcomputer and the digital/analog signal converter that is connected with this single-chip microcomputer.
Described photoreceptor receives the position that laser head sends round hot spot by the four-quadrant photo-sensitive cell, this photoreceptor sends simulating signal and converts digital signal input single-chip microcomputer to by converter again, the sensitization focus of setting first quartile A is A to the distance of four-quadrant photo-sensitive cell central point, the second quadrant C sensitization focus is C to the distance of four-quadrant photo-sensitive cell central point, third quadrant B sensitization focus is B to the distance of four-quadrant photo-sensitive cell central point, and four-quadrant D sensitization focus is D to the distance of four-quadrant photo-sensitive cell central point
Through single-chip microcomputer relatively,
When (A+C)-(B+D) ≠ 0, then send drive Y servomotor and adjust the four-quadrant photo-sensitive cell automatically in its optical axis normal plane Y direction translation,
When (A+D)-(B+C) ≠ 0, then send drive X servomotor and adjust the X-axis position of four-quadrant photo-sensitive cell automatically, in its optical axis normal plane X-direction translation,
When above two formula all are zero, do not send drive signal, X, Y servomotor are not worked.
A kind of servo system for adjusting position of origin of optical axis for laser head assembly of the present invention, employing is used for fixing the laser head fixed mount of laser head to be adjusted, be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis to be adjusted position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, this laser signal position comparer output comparison signal is controlled this position regulator and is driven photo-sensitive cell to be adjusted and move to described position regulator; This kind servo system for adjusting position of origin of optical axis for laser head assembly, owing to adopt to be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, make the process automation of adjusting optical element origin of optical axis position finish, make the degree of accuracy of correcting be guaranteed, the consistance that has overcome manual setting is poor, the problem that defect rate is high.
Description of drawings
In order to be easy to explanation, the present invention is done to describe in detail by following preferred embodiment and accompanying drawing.
Fig. 1 structural representation of the present invention;
Embodiment
See also shown in Figure 1ly, a kind of servo system for adjusting position of origin of optical axis for laser head assembly of the present invention comprises: be used for fixing the laser head fixed mount 1 of laser head to be adjusted,
Wherein, also comprise: be arranged on and be used to respond to the photoreceptor 2 that laser head sends laser signal on this laser head fixed mount 1, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator 3 of laser head photo-sensitive cell origin of optical axis to be adjusted position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, this laser signal position comparer output comparison signal is controlled these position regulator 3 drives photo-sensitive cell to be adjusted and is moved to described position regulator 3; This kind servo system for adjusting position of origin of optical axis for laser head assembly, owing to adopt to be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, make the process automation of adjusting optical element origin of optical axis position finish, make the degree of accuracy of correcting be guaranteed, the consistance that has overcome manual setting is poor, the problem that defect rate is high.
In this embodiment, described position regulator 3 comprises: the vacuum slot 31 that is used to locate described laser head photo-sensitive cell to be adjusted position, be connected, be used to drive the X platform 32 of this vacuum slot 31 with this vacuum slot 31, be connected, be used to drive the Y platform 33 of this vacuum slot 32 with this vacuum slot 32 along photo-sensitive cell optical axis normal plane Y direction to be adjusted translation along photo-sensitive cell optical axis normal plane X-direction to be adjusted translation.
In this embodiment, described position regulator 3 comprises: the micromatic setting 34 that is connected, is used to adjust these vacuum slot 31 angles with described vacuum slot 31; Can revise the vector angle position of adjusting vacuum slot 31 by this micromatic setting 34 is set, and then adjust the vector angle position of photo-sensitive cell to be adjusted.
In this embodiment, described position regulator 3 comprises: the height control slide block 35 that is connected, is used to adjust described vacuum slot 31 relative altitude positions with described micromatic setting 34; Can adjust the relative altitude position of photo-sensitive cell by this height control slide block 35 is set, and then adjust laser head forms focus (circle hot spot) on photo-sensitive cell to be adjusted size.
In this embodiment, described X platform 32 comprises X platform servomotor 321, and described Y platform comprises Y platform servomotor 331.
In this embodiment, described photo-sensitive cell to be adjusted is the four-quadrant photo-sensitive cell, and this four-quadrant photo-sensitive cell is made up of four square sensitization quadrants, and described four square sensitization quadrants are first quartile A, the second quadrant C, third quadrant B, four-quadrant D.
In this embodiment, described laser signal position comparer is single-chip microcomputer and the digital/analog signal converter that is connected with this single-chip microcomputer.
Described photoreceptor 2 receives the position that laser head sends round hot spot by the four-quadrant photo-sensitive cell, this photoreceptor 2 sends simulating signal and converts digital signal input single-chip microcomputer to by converter again, the sensitization focus of setting first quartile A is A to the distance of four-quadrant photo-sensitive cell central point, the second quadrant C sensitization focus is C to the distance of four-quadrant photo-sensitive cell central point, third quadrant B sensitization focus is B to the distance of four-quadrant photo-sensitive cell central point, and four-quadrant D sensitization focus is D to the distance of four-quadrant photo-sensitive cell central point
Through single-chip microcomputer relatively,
When (A+C)-(B+D) ≠ 0, then send drive Y servomotor 331 and adjust the four-quadrant photo-sensitive cell automatically in its optical axis normal plane Y direction translation,
When (A+D)-(B+C) ≠ 0, then send drive X servomotor 321 and adjust the X-axis position of four-quadrant photo-sensitive cell automatically, in its optical axis normal plane X-direction translation,
When above two formula all are zero, do not send drive signal, X, Y servomotor are not worked.
The embodiment of the above is a better embodiment of the present invention, is not to limit concrete practical range of the present invention with this, and the equivalence that all shapes according to the present invention, structure are done changes all in protection scope of the present invention.
Claims (8)
1. servo system for adjusting position of origin of optical axis for laser head assembly, it comprises: it comprises: be used for fixing the laser head fixed mount of laser head to be adjusted,
It is characterized in that, also comprise: be arranged on and be used to respond to the photoreceptor that laser head sends laser signal on this laser head fixed mount, the laser signal position comparer that is connected with this photoreceptor signal, be connected with this laser signal position comparer, be used to adjust the position regulator of laser head photo-sensitive cell origin of optical axis to be adjusted position, described laser signal position comparer is the FPGA (Field Programmable Gate Array) arithmetic unit of built-in comparison program, this laser signal position comparer output comparison signal is controlled this position regulator and is driven photo-sensitive cell to be adjusted and move to described position regulator.
2. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 1, it is characterized in that: described position regulator comprises: the vacuum slot that is used to locate described laser head photo-sensitive cell to be adjusted position, be connected with this vacuum slot, be used to drive the X platform of this vacuum slot, be connected, be used to drive the Y platform of this vacuum slot with this vacuum slot along photo-sensitive cell optical axis normal plane Y direction to be adjusted translation along photo-sensitive cell optical axis normal plane X-direction to be adjusted translation.
3. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 2 is characterized in that: described position regulator comprises: the micromatic setting that is connected, is used to adjust this vacuum slot angle with described vacuum slot.
4. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 3 is characterized in that: described position regulator comprises: the height control slide block that is connected, is used to adjust described vacuum slot relative altitude position with described micromatic setting.
5. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 4 is characterized in that: described X platform comprises X platform servomotor, and described Y platform comprises Y platform servomotor.
6. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 5, it is characterized in that: described photo-sensitive cell to be adjusted is the four-quadrant photo-sensitive cell, this four-quadrant photo-sensitive cell is made up of four square sensitization quadrants, described four square sensitization quadrants are first quartile A, the second quadrant B, third quadrant C, four-quadrant D.
7. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 6 is characterized in that: described laser signal position comparer is single-chip microcomputer and the digital/analog signal converter that is connected with this single-chip microcomputer.
8. a kind of servo system for adjusting position of origin of optical axis for laser head assembly according to claim 7, it is characterized in that: described photoreceptor receives the position that laser head sends round hot spot by the four-quadrant photo-sensitive cell, this photoreceptor sends simulating signal and converts digital signal input single-chip microcomputer to by converter again, the sensitization focus of setting first quartile A is A to the distance of four-quadrant photo-sensitive cell central point, the second quadrant B sensitization focus is B to the distance of four-quadrant photo-sensitive cell central point, third quadrant C sensitization focus is C to the distance of four-quadrant photo-sensitive cell central point, and four-quadrant D sensitization focus is D to the distance of four-quadrant photo-sensitive cell central point
Through single-chip microcomputer relatively,
When (A+C)-(B+D) ≠ 0, then send drive Y servomotor and adjust the four-quadrant photo-sensitive cell automatically in its optical axis normal plane Y direction translation,
When (A+D)-(B+C) ≠ 0, then send drive X servomotor and adjust the X-axis position of four-quadrant photo-sensitive cell automatically, in its optical axis normal plane X-direction translation,
When above two formula all are zero, do not send drive signal, X, Y servomotor are not worked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910105742A CN101833960A (en) | 2009-03-13 | 2009-03-13 | Servo system for adjusting position of origin of optical axis for laser head assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910105742A CN101833960A (en) | 2009-03-13 | 2009-03-13 | Servo system for adjusting position of origin of optical axis for laser head assembly |
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| CN101833960A true CN101833960A (en) | 2010-09-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289816A (en) * | 2014-09-27 | 2015-01-21 | 昆山允升吉光电科技有限公司 | Metal mask plate cutting equipment |
| CN104353934A (en) * | 2014-09-27 | 2015-02-18 | 昆山允升吉光电科技有限公司 | Spacing rotating laser cutting device |
| CN104400230A (en) * | 2014-09-27 | 2015-03-11 | 昆山允升吉光电科技有限公司 | Method of using laser cutting device for cutting mask plate |
-
2009
- 2009-03-13 CN CN200910105742A patent/CN101833960A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289816A (en) * | 2014-09-27 | 2015-01-21 | 昆山允升吉光电科技有限公司 | Metal mask plate cutting equipment |
| CN104353934A (en) * | 2014-09-27 | 2015-02-18 | 昆山允升吉光电科技有限公司 | Spacing rotating laser cutting device |
| CN104400230A (en) * | 2014-09-27 | 2015-03-11 | 昆山允升吉光电科技有限公司 | Method of using laser cutting device for cutting mask plate |
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Application publication date: 20100915 |