CN108262557A - A kind of laser marking machine Atomatic focusing method and focusing mechanism based on optical axis light - Google Patents
A kind of laser marking machine Atomatic focusing method and focusing mechanism based on optical axis light Download PDFInfo
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- CN108262557A CN108262557A CN201810224719.1A CN201810224719A CN108262557A CN 108262557 A CN108262557 A CN 108262557A CN 201810224719 A CN201810224719 A CN 201810224719A CN 108262557 A CN108262557 A CN 108262557A
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- Prior art keywords
- optical axis
- marking machine
- laser marking
- laser
- displacement device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/361—Removing material for deburring or mechanical trimming
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Automatic Focus Adjustment (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
The invention discloses a kind of laser marking machine Atomatic focusing method and focusing mechanism based on optical axis light, by tracking subpoint position on planar array detector image planes of the light pencil by objective lens optical axis of laser marking machine on object, to realize focus function.The light pencil for sending out inside laser marking machine and being emitted through objective lens optical axis, it is radiated at marking subject surface and forms projection hot spot, one planar array detector for having fixed position relationship with object lens, the projection hot spot is imaged and obtains the laser image spot and the deviation of pre-stored location, the axial distance of object lens and marking object is changed by electricity driving displacement device and this deviation is made to be zero, so as to fulfill auto-focusing.The present invention has higher focusing sensitivity and precision, detecting system installation degree of freedom is high, the target point not transverse shifting being tracked in focussing process realizes the auto-focusing without artificial interpretation or intervention with reference to electricity driving displacement device, adapts to the marking object of variform.
Description
Technical field
The invention belongs to laser marking machine technical field, more particularly, to a kind of laser marking machine based on optical axis light from
Dynamic focusing method and focusing mechanism.
Background technology
Laser marking machine is the technology for stamping permanent marks in a variety of different material surfaces using laser beam.The technology is led to
It crosses laser and generates laser beam, by a series of optic deliveries and processing, carry out light beam focusing eventually by optical mirror slip, then
High-energy light beam after focusing is deflected into the designated position of body surface to be processed.Laser marking machine can mark various texts
Word, symbol and pattern, market application foreground are wide.
Focusing is correctly the premise that laser marking machine obtains clear marking figure.It is existing most of including 3D laser markings
Machine generally by inputting thickness, the height equidimension of marking object, then makes laser beam by the means such as manual or electronic again
It is i.e. accurate burnt to be focused at marking subject surface, when marking object size is unknown or is difficult to measure, focus operations will become it is cumbersome or
It is difficult.
For auto-focusing then without knowing marking object size in advance, it can be automatically by marking object lock in accurate burnt position
It puts.The key of auto-focusing is position from defocus, i.e., how to judge whether marking object deviates from focus position.In laser marking machine
Upper additional laser rangefinder and to be directed toward marked area be a common methods, when marking subject out of focus, laser range finder can be felt
Know the variation of distance, but it has a shortcoming, since its distance measuring light beam is oblique illumination marking object, with focusing into
Capable, distance measuring light beam understands transverse shifting in the projected light of marking subject surface, so as to deviate scheduled marked area, when marking pair
As if during on-plane surface, this problem is just very serious.The position from defocus of nearly all oblique illumination marking object has this problem.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of laser marking machine auto-focusing sides based on optical axis light
The light pencil being emitted through objective lens optical axis is utilized in method and focusing mechanism, can guarantee that light pencil projection hot spot does not exist in focussing process
Marking subject surface transverse shifting can not only simplify optical system, reduce cost, while have higher focusing sensitivity and essence
Degree.
A kind of laser marking machine Atomatic focusing method based on optical axis light, includes the following steps：
(1) it by generating the light pencil across objective lens optical axis inside laser marking machine, is radiated at marking subject surface and generates throwing
Shadow hot spot；
(2) by there is the planar array detector of fixed position relationship with object lens, above-mentioned projection hot spot is imaged；
(3) microprocessor system obtains the current location of planar array detector laser image spot, and predeterminated position corresponding with quasi- coke
It is compared；
(4) if above-mentioned two positions are misfitted, microprocessor system instruction electricity driving displacement device controls marking object and object lens
Between do closer or far from relative motion, contracted position is poor, then goes to above-mentioned steps (3), if above-mentioned two positions coincide, turn
To following step (5)；
(5) microprocessor system instruction electricity driving displacement device stops the relative motion between marking object and object lens, automatically
Focusing is completed.
In step (4), the object lens can with fixed placement, by electricity driving displacement device control marking object closer or far from
The relative motion of object lens；Or by marking object fixed placement, object lens are controlled closer or far from marking by electricity driving displacement device
The relative motion of object.
The present invention also provides a kind of laser marking machine automatic focusing mechanism based on optical axis light, including：
Laser marking machine, for generating laser or light pencil；
Object lens, positioned at laser marking machine output terminal, for being emitted to mark by parallel laser beam focus or by light pencil
It carves on object, generates projection hot spot；
Planar array detector keeps relative space position to fix with object lens, for projection hot spot imaging；
Electricity driving displacement device, for control done between marking object and object lens closer or far from relative motion；
Microprocessor system is connect with planar array detector and electricity driving displacement device, for reading planar array detector laser image spot
Current location, electricity driving displacement device is driven to compensate defocus according to the difference of the laser image spot and reserved focus position.
In the present apparatus, light pencil generates projection hot spot through objective lens exit, illumination marking object, and planar array detector is to the projection
Hot spot is imaged, and microprocessor system can drive electricity driving displacement device compensation defocus according to the laser image spot, so as to fulfill auto-focusing
Target.
In the device, planar array detector keeps space fixed relationship with object lens, and electricity driving displacement device both can be configured to carry
Object lens can be configured as carrying marking object.
Preferably, the optical axis of the object lens is overlapped with the light pencil that laser marking machine exports.Ensure thin in focussing process
Light beam projecting hot spot is not in marking subject surface transverse shifting so that when to Object Surface and complex surface object marking also not
Scheduled marked area can be deviateed.
Preferably, the planar array detector is fixed on the shell of laser marking machine so that the structure of whole device is more
Step up to gather, the position between planar array detector and object lens is relatively fixed.
Preferably, the marking object is fixed on the electricity driving displacement device, the control marking pair of electricity driving displacement device
As closer or far from object lens.
Preferably, the laser marking machine is fixed on the electricity driving displacement device, electricity driving displacement device control object lens
Closer or far from marking object.
Preferably, the microprocessor system be a system based on embedded chip such as MCU, DSP or ARM etc. or
PC machine.It can read the image information of planar array detector and processing obtains current facula position.Microprocessor system advances for
There are one location information corresponding with quasi- coke, which can guarantee that marking goes out clearly figure.Microprocessor system can incite somebody to action
Current facula position is compared with reserved focus position.
The beneficial effects of the invention are as follows：
1st, the present invention is ingenious for auto-focusing by the instruction feux rouges of most laser marking machine standard configurations, can simplify optics
System reduces cost.Certainly it needs additionally to be configured in the case of no or be swashed using the marking through moderately decaying for passing through optical axis
Trimmed book body.
2nd, the present invention can guarantee that light pencil is thrown in focussing process since the light pencil being emitted through objective lens optical axis is utilized
For shadow hot spot not in marking subject surface transverse shifting, this is very important the marking of Object Surface and complex surface object.
3rd, the present invention is not high to the installation requirement of planar array detector, as long as the light pencil projected light of marking subject surface can be allowed
Spot enters detector field of view, and detector keeps constant with the relative position of object lens after installation.
4th, the displacement drive during auto-focusing of the present invention, can both act on object lens, can also act on marking pair
As long as both this can perform relative motion, so as to offer convenience to different use target or occasion.
5th, the present invention has higher focusing sensitivity and precision, and the submillimeter focusing that can fully meet laser marking machine will
It asks.
6th, disclosure is particularly well suited to size is unknown or be difficult to the marking object measured.
Description of the drawings
Fig. 1 is the embodiment of the present invention schematic diagram；
Fig. 2 is another embodiment schematic diagram of the present invention.
In figure：1. object lens, 2. marking objects, 3. electricity driving displacement devices, 4. microprocessor systems, 5. planar array detectors, 6.
Light pencil.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, the laser marking machine of the present embodiment is vertical structure, including object lens 1, marking object 2, electricity driving displacement
Device 3, microprocessor system 4, planar array detector 5 and light pencil 6.Object lens 1 are located at the output terminal of laser marking machine, marking object
2 can follow electricity driving displacement device 3 to move up and down vertically.Planar array detector 5 has fixed position relationship, this implementation with object lens 1
In example, planar array detector 5 and 1 equal remains stationary of object lens.Light pencil 6 can be generated inside laser marking machine, the optical axis through object lens 1
Outgoing, illumination marking object 2, and projection hot spot is generated on marking object 2.
The laser marking machine Atomatic focusing method step of the present embodiment is as follows：
Step 1, by generating the light pencil 6 across 1 optical axis of object lens inside laser marking machine, it is radiated at 2 surface of marking object
Generate projection hot spot.
Step 2, planar array detector 5 is imaged above-mentioned projection hot spot.
Step 3, microprocessor system 4 obtains the current location of 5 laser image spot of planar array detector, and corresponding with quasi- coke default
Position is compared.Microprocessor system 4 is advanced for there are one location information corresponding with quasi- coke, which can guarantee
Marking goes out clearly figure.
Step 4, microprocessor system 4 also controls electricity driving displacement device 3, it is determined according to the comparison result of above-mentioned position
Whether electricity driving displacement device 3 drives and driving direction.Electricity driving displacement device 3 by continuous vertical and straight movement to correct above-mentioned alternate position spike,
Until the alternate position spike is zero, the also corresponding stop motion of marking object 2 at this time, meaning auto-focusing is completed.
Step 5, laser marking machine can be to carrying out marking based on the region near above-mentioned optical axis ray cast facula position
Operation, can the size of marked area depend on the face shape distribution in the region, be subject in region can marking it is clear.
Embodiment 2
As shown in Fig. 2, the laser marking machine of the present embodiment is horizontal type structure, including object lens 1, marking object 2, electricity driving displacement
Device 3, microprocessor system 4, planar array detector 5 and light pencil 6.Object lens 1 are located at the output terminal of laser marking machine, marking object
2 static placements, object lens 1 can follow electricity driving displacement device 3 to move horizontally.Planar array detector 5 has fixed position to close with object lens 1
It is that in the present embodiment, when object lens 1 move, planar array detector 5 is also corresponding mobile.Light pencil can be generated inside laser marking machine
6, the optical axis outgoing through object lens 1, illumination marking object 2, and projection hot spot is generated on marking object 2.
The laser marking machine Atomatic focusing method step of the present embodiment is as follows：
Step 1, by generating the light pencil 6 across 1 optical axis of object lens inside laser marking machine, it is radiated at 2 surface of marking object
Generate projection hot spot.
Step 2, planar array detector 5 is imaged above-mentioned projection hot spot.Planar array detector 5 has fixed position to close with object lens 1
System, it is meant that when object lens 1 move, planar array detector 5 is also corresponding mobile.
Step 3, microprocessor system 4 obtains the current location of 5 laser image spot of planar array detector, and corresponding with quasi- coke default
Position is compared.Microprocessor system 4 is advanced for there are one location information corresponding with quasi- coke, which can guarantee
Marking goes out clearly figure.
Step 4, microprocessor system 4 also controls electricity driving displacement device 3, it is determined according to the comparison result of above-mentioned position
Whether electricity driving displacement device 3 drives and driving direction.Electricity driving displacement device 3 drives object lens 1 to move horizontally with amendment by continuous
Above-mentioned alternate position spike, until the alternate position spike is zero, the also corresponding stop motion of object lens 1 at this time, meaning auto-focusing is completed.
Step 5, laser marking machine can be to carrying out marking based on the region near above-mentioned optical axis ray cast facula position
Operation, can the size of marked area depend on the face shape distribution in the region, be subject in region can marking it is clear.
Claims (9)
1. a kind of laser marking machine Atomatic focusing method based on optical axis light, which is characterized in that include the following steps：
(1) it by generating the light pencil across objective lens optical axis inside laser marking machine, is radiated at marking subject surface and generates projected light
Spot；
(2) by there is the planar array detector of fixed position relationship with object lens, above-mentioned projection hot spot is imaged；
(3) microprocessor system obtains the current location of planar array detector laser image spot, and is carried out with accurate burnt corresponding predeterminated position
It compares；
(4) if above-mentioned two positions are misfitted, microprocessor system instruction electricity driving displacement device is controlled between marking object and object lens
Do closer or far from relative motion, contracted position is poor, then goes to above-mentioned steps (3), if above-mentioned two positions coincide, goes to down
State step (5)；
(5) microprocessor system instruction electricity driving displacement device stops the relative motion between marking object and object lens, auto-focusing
It completes.
2. the laser marking machine Atomatic focusing method according to claim 1 based on optical axis light, which is characterized in that step
(4) in, the object lens fixed placement, the electricity driving displacement device control marking object is closer or far from the relative motion of object lens.
3. the laser marking machine Atomatic focusing method according to claim 1 based on optical axis light, which is characterized in that step
(4) in, the marking object fixed placement, the electricity driving displacement device control object lens are closer or far from the opposite fortune of marking object
It is dynamic.
4. a kind of laser marking machine automatic focusing mechanism based on optical axis light, which is characterized in that including：
Laser marking machine, for generating laser or light pencil；
Object lens, positioned at laser marking machine output terminal, for being emitted to marking pair by parallel laser beam focus or by light pencil
As upper, generation projection hot spot；
Planar array detector keeps relative space position to fix with object lens, for projection hot spot imaging；
Electricity driving displacement device, for control done between marking object and object lens closer or far from relative motion；
Microprocessor system is connect with planar array detector and electricity driving displacement device, for reading working as planar array detector laser image spot
Front position drives electricity driving displacement device to compensate defocus according to the difference of the laser image spot and reserved focus position.
5. the laser marking machine automatic focusing mechanism according to claim 4 based on optical axis light, which is characterized in that described
The optical axis of object lens is overlapped with the light pencil that laser marking machine exports.
6. the laser marking machine automatic focusing mechanism according to claim 4 based on optical axis light, which is characterized in that described
Planar array detector is fixed on the shell of laser marking machine.
7. the laser marking machine automatic focusing mechanism according to claim 4 based on optical axis light, which is characterized in that described
Marking object is fixed on the electricity driving displacement device, and electricity driving displacement device controls marking object closer or far from object lens.
8. the laser marking machine automatic focusing mechanism according to claim 4 based on optical axis light, which is characterized in that described
Laser marking machine is fixed on the electricity driving displacement device, and electricity driving displacement device controls object lens closer or far from marking object.
9. the laser marking machine automatic focusing mechanism according to claim 4 based on optical axis light, which is characterized in that described
Microprocessor system is a system or PC machine based on MCU, DSP or ARM.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810224719.1A CN108262557A (en) | 2018-03-19 | 2018-03-19 | A kind of laser marking machine Atomatic focusing method and focusing mechanism based on optical axis light |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810224719.1A CN108262557A (en) | 2018-03-19 | 2018-03-19 | A kind of laser marking machine Atomatic focusing method and focusing mechanism based on optical axis light |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0613282A (en) * | 1992-06-26 | 1994-01-21 | Fujitsu Ltd | Autofocus, mask wafer gap measuring method and its equipment |
| CN104535296A (en) * | 2014-12-03 | 2015-04-22 | 中国科学院苏州生物医学工程技术研究所 | Coaxiality detection and adjusting method of multiple beams |
| US9215425B1 (en) * | 2013-02-04 | 2015-12-15 | Bruker Nano Inc. | Camera-aided focusing in optical metrology |
| CN106964904A (en) * | 2016-01-14 | 2017-07-21 | 大族激光科技产业集团股份有限公司 | A kind of laser marking machine of multiangle visual positioning and its method for laser marking |
| CN207952926U (en) * | 2018-03-19 | 2018-10-12 | 浙江大学 | A kind of laser marking machine automatic focusing mechanism based on optical axis light |
-
2018
- 2018-03-19 CN CN201810224719.1A patent/CN108262557A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0613282A (en) * | 1992-06-26 | 1994-01-21 | Fujitsu Ltd | Autofocus, mask wafer gap measuring method and its equipment |
| US9215425B1 (en) * | 2013-02-04 | 2015-12-15 | Bruker Nano Inc. | Camera-aided focusing in optical metrology |
| CN104535296A (en) * | 2014-12-03 | 2015-04-22 | 中国科学院苏州生物医学工程技术研究所 | Coaxiality detection and adjusting method of multiple beams |
| CN106964904A (en) * | 2016-01-14 | 2017-07-21 | 大族激光科技产业集团股份有限公司 | A kind of laser marking machine of multiangle visual positioning and its method for laser marking |
| CN207952926U (en) * | 2018-03-19 | 2018-10-12 | 浙江大学 | A kind of laser marking machine automatic focusing mechanism based on optical axis light |
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