CN101301788A - Laser plastic micro-welding method based on LCD space light modulator and device - Google Patents
Laser plastic micro-welding method based on LCD space light modulator and device Download PDFInfo
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- CN101301788A CN101301788A CNA2008101236618A CN200810123661A CN101301788A CN 101301788 A CN101301788 A CN 101301788A CN A2008101236618 A CNA2008101236618 A CN A2008101236618A CN 200810123661 A CN200810123661 A CN 200810123661A CN 101301788 A CN101301788 A CN 101301788A
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Abstract
The invention relates to the field of plastic welding, in particular to a laser plastic micro-welding method and a device based on a crystal space photomodulator. The invention is suitable for the fast welding between plastic materials, in particular to the welding of plastic micro-apparatus. The device includes a laser, an astigmatism system, a crystal space photomodulator, a computer and a focusing system. The micro-welding method includes the following steps of: utilizing the computer to preciously control a phase diagram displayed on the crystal space photomodulator to lead a laser beam to be modulated and shaped after passing through the crystal space photomodulator and obtain a facular with the shape consistent to a welding line after assembled by the focusing system; the facular irradiates on a workpiece so as to realize the synchronous welding of the two plastics. The invention integrates the laser beam shaping technology to the plastic transmission micro-welding technique, thus being capable of adapting the synchronous welding of the welding lines of different shapes and realizing low cost and large batch for welding the micro-apparatuses; besides, the technique is simple and the consistency is good; the invention is suitable for automatization production.
Description
Technical field
The present invention relates to the Plastic Welding field, refer in particular to a kind of laser plastic micro-welding method and device based on LCD space light modulator, the rapid welding that it is applicable between plastic material is particularly suitable for the welding of plastics micro element, can guarantee high efficiency, the mass production of microwelding.
Background of invention
Traditional TECHNOLOGY OF WELDING PLASTICS comprises: ultrasonic bonding, Vibration Welding, flat plate heat welding etc.The advantage of laser plastic welding is the resin less degradation, and the chip of generation is few, because laser is untouchable, can not produce pollution in welding process.Another major advantage is that the laser plastic welding is littler than vibration stress and the thermal stress that other connected modes produced, so just improved the service life of goods or device intraware greatly, so the laser plastic welding method is more suitable for being applied to flimsy electronic sensor, microfluidic device, MEMS.In the seventies in 20th century, laser begins to be applied on the Plastic Welding, because the unique advantage of laser plastic solder technology and the development of laser technology, to the nineties in 20th century, the laser plastic solder technology has obtained large-scale commercial Application.The welding of the laser plastic the earliest application that sees bibliographical information is in 1972, uses 100 watts CO
2LASER Light Source is with the speed polyethylene welding thin plate (maximum ga(u)ge is 1.5 millimeters) of 10 millimeters of per seconds.
The laser plastic welding has obtained development fast in recent years as a kind of novel TECHNOLOGY OF WELDING PLASTICS, and all there has been comparatively deep research in each research institution to method, technology, the equipment of this technology both at home and abroad.Wherein, aspect welding method, the patent No. that Switzerland Leste Processing Tech. AG delivers is the technology of CN00101924.4: the method for laser welding of welding plastic workpiece or plastics and other materials and device, on welding method, study exactly, according to precognition weld shape designing mask plate, utilize mask plate to block the part of laser beam, the shape of mask plate printing opacity is identical with the precognition weld seam, utilize through the light beam behind the mask plate at last plastics welded, but have following problem:
1. can not weld little meticulous product;
2. light source and treat to have between the weldment higher the relatively moving of speed causes the buckling deformation of working of plastics easily;
3. the intensity distributions of laser beam is that Gaussian causes melting irregular;
4. the mask manufacture difficulty need be made different masks at different weld seams, and cost is higher.
Summary of the invention:
The purpose of this invention is to provide a kind of laser plastic micro-welding method.Light path part in the design laser plastic welding system is carried out modulation reshaping to laser beam, makes that the light spot shape of laser beam is identical with the weld shape of precognition, finally to-be-welded region is welded synchronously.
Said laser plastic micro-welding method, be: the laser beam that laser instrument sends, after astigmatic system, form large diameter collimated light beam, and shine on the LCD space light modulator, laser beam is by behind the LCD space light modulator, modulatedly is shaped to the hot spot similar to weld shape, the convergence formation hot spot consistent through focusing system with weld shape, see through first kind of plastics, act on place, two kinds of plastics part composition surfaces after, cooling back formation weld seam naturally.
The present invention also provides a kind of laser plastic microwelding device, be: comprise laser instrument 1, astigmatic system, LCD space light modulator 5, computer 6 and focusing system, wherein, astigmatic system, LCD space light modulator 5 and focusing system be provided with from top to bottom successively and the axle center on same center line; Computer 6 links to each other with LCD space light modulator 5 and constitutes figure controlled dynamic diffraction optical element.
Above-mentioned said astigmatic system is made up of the convex lens of two different focal, and it is near from laser instrument that the convex lens that focal length is little are placed on the top, and it is far away from laser instrument that the convex lens that focal length is big are placed on the below.Function needs according to design, distance in the astigmatism system between two convex lens equals both focal length sums, and the ratio of big focal length and little focal length is exactly the ratio that laser beam amplifies, keep the distance between two convex lens constant, can guarantee still to be collimated light beam after laser beam is by astigmatic system.Amplify the damaging thresholding that makes laser beam energy density be lower than LCD space light modulator through astigmatic system, make the display screen life-span prolong, do not have the characteristics of normal masks Stimulated Light ablation rapid wear.
Above-mentioned said focusing system is made up of convex lens and a slice concavees lens of two different focal, and three lens are followed successively by big focal length convex lens, little focal length convex lens, concavees lens from top to bottom.Function needs according to design, distance between three lens of focusing system is by the size decision of workpiece weld seam, regulate the distance between big focal length convex lens, little focal length convex lens and the concavees lens, guarantee that laser beam obtains the hot spot consistent with weld shape later on by focusing system.
When using the inventive method and device to weld, workpiece to be welded is placed under the focusing system, and the light transmission plastics part is last, and the light absorptive plastics part is following.Better method is, is coated with the last layer absorbent on light transmission plastics part and light absorptive plastics part composition surface, guarantees that laser beam can better be absorbed.
Among the present invention, the axle center of laser beam, astigmatic system, LCD space light modulator, focusing system is remained on same the center line, avoid laser beam in transmission course, to be offset, guarantee to obtain expecting and want the hot spot that forms.
Function needs according to design, the phase diagram that computer calculates algorithm routine by data wire is input to the control module of LCD space light modulator, and control module is converted into the phase place gray-scale map by look-up table the phase value on each pixel of spatial light modulator.Difform weld seam only need be regulated the phase value on each pixel on the LCD space light modulator, has avoided repeating to make mask.
Description of drawings:
Fig. 1 is the laser plastic microwelding device schematic diagram based on LCD space light modulator that proposes according to the present invention.
Wherein, 1. laser instrument; 2. laser beam; 3. little focal length convex lens; 4. big focal length convex lens; 5. LCD space light modulator; 6. computer; 7. big focal length convex lens; 8. little focal length convex lens; 9. concavees lens; 10. light transmission plastics part; 11. composition surface; 12. light absorptive plastics part; 13. center line
Fig. 2 is the laser plastic microwelding flow chart based on LCD space light modulator that proposes according to the present invention.
Fig. 3 is the GS algorithm flow chart.
The specific embodiment:
The present invention propose based on the laser plastic microwelding device of LCD space light modulator as shown in Figure 1.Form by laser instrument 1, astigmatic system, LCD space light modulator 5, computer 6, focusing system; The astigmatism system is made up of the convex lens of two different focal, and it is near from laser instrument 1 that the convex lens 3 that focal length is little are placed on the top, and it is far away from laser instrument 1 that the convex lens 4 that focal length is big are placed on the below; Under the astigmatism system is LCD space light modulator 5, and LCD space light modulator 5 is connected to computer 6 by data wire; Be focusing system under the LCD space light modulator 5, focusing system is made up of convex lens and a slice concavees lens of two different focal, and three lens are followed successively by big focal length convex lens 7, little focal length convex lens 8, concavees lens 9 from top to bottom.
Specific as follows with reference to Fig. 1, Fig. 2 implementation process:
At first be the phase diagram that is used to calculate different weld shapes according to GS algorithm coding in computer 6, the GS algorithm flow as shown in Figure 3, basic step may be summarized to be:
1. the initial phase of given binary optical elements distributes
(PHASE DISTRIBUTION that later on each iteration uses step 5 to obtain), with the amplitude of incident light | U (x, y) | constitute the wave function f of incident
n(x, y);
2. to f
n(x y) obtains g as Fourier transform
n(u, v);
3. use g
n(u, the amplitude that phase bit position v) and hope obtain | G (u, v) | constitute g
n' (u, v);
4. to g
n' (u v) obtains f as inverse Fourier transform
N+1' (x, y);
5. use f
N+1' (x, phase place y) and the amplitude of incident light | U (x, y) | constitute the incidence wave function f of next iteration
n(x, y);
6. repeating above step satisfies the expection requirement or reaches maximum iteration time up to design accuracy.
Optimizing the phase structure obtain is an amplitude phase diagram, and phase diagram is input to the control module of LCD space light modulator 5, and control module is converted into the phase place gray-scale map by look-up table the phase value on each pixel of LCD space light modulator 5.
Be the preparation of light transmission plastics part 10 and light absorptive plastics part 12 then, selecting two blocks of Merlon for use is workpiece to be welded, and 11 places, composition surface at two workpiece are coated with last layer clearweld absorbent, guarantee better to absorb laser beam 2.
According to the phase diagram that shows on the LCD space light modulator 5, and the multiple of astigmatic system expansion bundle, the laser facula size that laser instrument 1 produces regulated.The expansion bundle multiple of astigmatism system is by little focal length convex lens 3 and 4 decisions of big focal length convex lens.
Be shaped as the hot spot similar by the laser beam behind the LCD space light modulator 52 is modulated to weld shape, and the intensity distributions of hot spot is modulated into flat-top from Gaussian distribution and distributes, spot size is extended with respect to weld seam, need to come the scaled down hot spot by focusing system for this reason, by regulating the distance between big focal length convex lens 7, little focal length convex lens 8 and the concavees lens 9, make laser beam 2 by obtaining the hot spot with the actual welds consistent size after the focusing system.
Carry out the laser plastic microwelding at last, utilize the light spot shape laser irradiation light transmission plastics part 10 consistent and the composition surface 11 of light absorptive plastics part 12 with actual welds.Form the heat effect district, plastics in heat effect district (being composition surface 11) are melted, the big molecule of plastics under the hot melt state is diffusion mutually under the effect of welding pressure, produce Van der Waals force, thereby link together closely, the material that has melted so forms joint, is welded parts promptly to be connected.
In sum, a kind of laser plastic micro-welding method and device involved in the present invention based on LCD space light modulator, the laser beam shaping technology is dissolved into the transmission micro-welding process of plastics, can adapt to the synchronous welding of difformity weld seam, the low cost that has realized the micro element welding is with in enormous quantities, technology is simple, high conformity, and be suitable for automated production.
Claims (7)
1, a kind of laser plastic micro-welding method based on LCD space light modulator, it is characterized in that, the laser beam that laser instrument sends, after astigmatic system, form large diameter collimated light beam, and shine on the LCD space light modulator, laser beam is by behind the LCD space light modulator, modulatedly be shaped to the hot spot similar to weld shape, the convergence formation hot spot consistent through focusing system with weld shape, see through first kind of plastics, after acting on place, two kinds of plastics part composition surfaces, the cooling back forms weld seam naturally.
2, a kind of device of implementing the described a kind of laser plastic micro-welding method based on LCD space light modulator of claim 1, it is characterized in that, comprise laser instrument (1), astigmatic system, LCD space light modulator (5), computer (6) and focusing system, wherein, astigmatic system, LCD space light modulator (5) and focusing system be provided with from top to bottom successively and the axle center on same center line; Computer (6) links to each other with LCD space light modulator (5) and constitutes figure controlled dynamic diffraction optical element.
As the said device of claim 2, it is characterized in that 3, said astigmatic system is made up of the convex lens of two different focal, the convex lens that focal length is little (3) are placed on the top, and the convex lens that focal length is big (4) are placed on the below.
4, device according to claim 3 is characterized in that, the distance between the medium and small focal length convex lens of astigmatic system (3), the big focal length convex lens (4) equals both focal length sums, and big focal length is the expansion bundle multiple of astigmatic system with the ratio of little focal length.
5, as the said device of claim 2, it is characterized in that, said focusing system is made up of convex lens and a slice concavees lens of two different focal, and three lens are followed successively by big focal length convex lens (7), little focal length convex lens (8), concavees lens (9) from top to bottom.
6, device according to claim 5, it is characterized in that, distance in the focusing system between big focal length convex lens (7), little focal length convex lens (8), the concavees lens (9) is determined by weld size, guarantees that laser beam (2) obtains the hot spot consistent with weld shape later on by focusing system.
7, device according to claim 2, it is characterized in that, the phase diagram that the transmission of the control module receiving computer (6) of LCD space light modulator (5) is come, and the phase place gray-scale map is converted into phase value on each pixel of LCD space light modulator (5), LCD space light modulator (5) carries out modulation reshaping to the laser beam (2) by it.
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| CNA2008101236618A CN101301788A (en) | 2008-05-23 | 2008-05-23 | Laser plastic micro-welding method based on LCD space light modulator and device |
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| CNA2008101236618A CN101301788A (en) | 2008-05-23 | 2008-05-23 | Laser plastic micro-welding method based on LCD space light modulator and device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603860B (en) * | 2009-07-23 | 2010-11-10 | 北京理工大学 | Femtojoule level laser micro energy meter with optical system |
| CN104118220A (en) * | 2014-03-28 | 2014-10-29 | 上海飞涅尔激光科技有限公司 | Two-dimensional code laser marking method and device based on liquid crystal spatial light modulator |
| CN109590606A (en) * | 2019-01-15 | 2019-04-09 | 北京理工大学 | A kind of method in femtosecond laser phase amplitude collaboration shaping processing butterfly nanometer gap |
| CN109724054A (en) * | 2017-10-31 | 2019-05-07 | 商洛市虎之翼科技有限公司 | A kind of far and near light structures and means of illumination of focusing |
| CN110140075A (en) * | 2016-12-27 | 2019-08-16 | 三菱工程塑料株式会社 | The manufacturing method of molded product and molded product |
| CN110521070A (en) * | 2017-04-19 | 2019-11-29 | Eo 科技股份有限公司 | Laser amplification device |
| CN115417586A (en) * | 2022-09-15 | 2022-12-02 | 华中科技大学 | Glass laser welding method and device |
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2008
- 2008-05-23 CN CNA2008101236618A patent/CN101301788A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603860B (en) * | 2009-07-23 | 2010-11-10 | 北京理工大学 | Femtojoule level laser micro energy meter with optical system |
| CN104118220A (en) * | 2014-03-28 | 2014-10-29 | 上海飞涅尔激光科技有限公司 | Two-dimensional code laser marking method and device based on liquid crystal spatial light modulator |
| CN110140075A (en) * | 2016-12-27 | 2019-08-16 | 三菱工程塑料株式会社 | The manufacturing method of molded product and molded product |
| CN113608314A (en) * | 2016-12-27 | 2021-11-05 | 三菱工程塑料株式会社 | Molded article and method for producing molded article |
| US11397372B2 (en) | 2016-12-27 | 2022-07-26 | Mitsubishi Engineering-Plastics Corporation | Molded article and method for manufacturing molded article |
| CN113608314B (en) * | 2016-12-27 | 2023-09-15 | 菱环球聚甲醛株式会社 | Molded article and method for producing molded article |
| CN110140075B (en) * | 2016-12-27 | 2024-03-22 | 菱环球聚甲醛株式会社 | Molded article and method for producing molded article |
| CN110521070A (en) * | 2017-04-19 | 2019-11-29 | Eo 科技股份有限公司 | Laser amplification device |
| CN109724054A (en) * | 2017-10-31 | 2019-05-07 | 商洛市虎之翼科技有限公司 | A kind of far and near light structures and means of illumination of focusing |
| CN109590606A (en) * | 2019-01-15 | 2019-04-09 | 北京理工大学 | A kind of method in femtosecond laser phase amplitude collaboration shaping processing butterfly nanometer gap |
| CN109590606B (en) * | 2019-01-15 | 2020-01-21 | 北京理工大学 | Method for machining butterfly-shaped nanometer gap through femtosecond laser phase amplitude collaborative shaping |
| CN115417586A (en) * | 2022-09-15 | 2022-12-02 | 华中科技大学 | Glass laser welding method and device |
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Open date: 20081112 |