CN111381382B - Laser light homogenizing and spot dissipating device - Google Patents
Laser light homogenizing and spot dissipating device Download PDFInfo
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- CN111381382B CN111381382B CN201811629741.0A CN201811629741A CN111381382B CN 111381382 B CN111381382 B CN 111381382B CN 201811629741 A CN201811629741 A CN 201811629741A CN 111381382 B CN111381382 B CN 111381382B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a laser light homogenizing and spot dissipating device, which comprises a beam shrinking lens assembly, a first dynamic wheel assembly comprising a first diffusion sheet or a first phase sheet and a second dynamic wheel assembly comprising a second diffusion sheet or a second phase sheet, wherein the first diffusion sheet or the first phase sheet is arranged on the beam shrinking lens assembly; the beam shrinking lens assembly, the first dynamic wheel assembly and the second dynamic wheel assembly are sequentially arranged from near to far according to the light emitting direction of the laser light source. The laser light homogenizing and spot dispersing device provided by the invention can effectively reduce the spatial coherence and/or the temporal coherence of a laser light source, thereby effectively reducing the speckle effect of laser and homogenizing the laser; furthermore, the invention utilizes a double-dynamic-wheel structure, effectively reduces the space volume of the dynamic wheel, and leads the laser light homogenizing and spot dissipating device to be small and compact.
Description
Technical Field
The invention relates to the field of laser application, in particular to a laser spot homogenizing and dispersing device.
Background
In recent years, laser display technology has been widely used in various fields because of its advantages such as high brightness, wide color gamut, high color reproducibility, long life, energy saving, and environmental protection. The development of laser light sources in the field of projection display technology is receiving more and more attention from the outside.
However, because the coherence of the laser light source is good, speckles and background fringes are easily generated, which brings certain obstacles to the application development of the laser. Therefore, how to effectively reduce the laser speckle effect and homogenize the laser illumination source is a problem which needs to be solved urgently at present.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a device for homogenizing and dispersing laser light, which is aimed at solving the problem that the technique cannot effectively reduce the laser speckle effect and homogenize the laser light source.
The technical scheme of the invention is as follows:
a laser light homogenizing and spot dissipating device comprises a beam shrinking lens assembly, a first dynamic wheel assembly comprising a first diffusion sheet or a first phase sheet and a second dynamic wheel assembly comprising a second diffusion sheet or a second phase sheet;
the beam shrinking lens assembly, the first dynamic wheel assembly and the second dynamic wheel assembly are sequentially arranged from near to far according to the light emitting direction of the laser light source.
The laser spot homogenizing and dispersing device comprises a first dynamic wheel assembly, a second dynamic wheel assembly, a first diffusion sheet and a second phase sheet, wherein the first dynamic wheel assembly further comprises a fixed support and a driving structure for driving the fixed support to vibrate, and the first diffusion sheet or the first phase sheet is arranged on the fixed support.
The laser spot homogenizing and dispersing device comprises a laser spot homogenizing device, a laser spot homogenizing device and a laser spot dispersing device, wherein the laser spot homogenizing and dispersing device comprises a first dynamic wheel assembly and a second dynamic wheel assembly, one end of a fixed support is connected with the sliding support through a spring, and the other end of the fixed support is provided with a magnet S end or a magnet N end; the driving structure is used for forming attractive force and repulsive force with the end S of the magnet or the end N of the magnet on the fixed support to drive the fixed support to vibrate.
The laser spot homogenizing and dispersing device comprises a driving structure and a laser spot homogenizing and dispersing device, wherein the driving structure comprises a first driving motor and a first driving wheel connected with the first driving motor, and at least one magnet S end and at least one magnet N end are uniformly arranged on the first driving wheel.
The laser light homogenizing and spot dissipating device comprises a driving structure and a laser light source, wherein the driving structure comprises an alternating current power supply and an electromagnetic coil electrically connected with the alternating current power supply.
The laser light homogenizing and spot dissipating device comprises a laser light source, a first dynamic wheel assembly, a second dynamic wheel assembly, a first dynamic wheel assembly and a second dynamic wheel assembly, wherein the first dynamic wheel assembly further comprises a sliding support, the left end and the right end of the fixed support are connected with the sliding support through springs, and the bottom end of the fixed support is provided with a magnet S end and a magnet N end; the driving structure comprises an alternating current power supply and an electromagnetic coil electrically connected with the alternating current power supply.
The laser spot homogenizing and dispersing device comprises a laser spot homogenizing and dispersing device, wherein the laser spot homogenizing and dispersing device comprises a first dynamic wheel assembly and a second dynamic wheel assembly, one end of the first dynamic wheel assembly is fixedly arranged, the other end of the first dynamic wheel assembly is provided with a magnet S end or a magnet N end, and the middle area of the first dynamic wheel assembly is fixedly connected with a fixing support through a screw; the driving structure comprises an alternating current power supply and an electromagnetic coil electrically connected with the alternating current power supply.
The laser spot homogenizing and dispersing device comprises a laser light source, a first dynamic wheel assembly, a second dynamic wheel assembly and a second phase plate, wherein the laser light source is arranged on the first dynamic wheel assembly, the first dynamic wheel assembly is connected with the first driving motor, and the second driving motor is connected with a second driving wheel.
The laser spot homogenizing and dispersing device is characterized in that when the fixing support is provided with a first diffusion sheet and the second driving wheel is fixedly provided with a second diffusion sheet, the diffusion half angle of the first diffusion sheet is 1.5-3 degrees, and the diffusion half angle of the second diffusion sheet is 3.5-7 degrees.
The laser spot homogenizing and dispersing device further comprises a coupling lens arranged between the first dynamic wheel component and the second dynamic wheel component, and a light guide light channel arranged behind the second dynamic wheel component.
Has the advantages that: the invention provides a laser light homogenizing and spot dispersing device, which comprises a first dynamic wheel component for reducing the temporal coherence or the spatial coherence of a laser light source and a second dynamic wheel component for reducing the spatial coherence or the temporal coherence of the laser light source, wherein when light beams emitted by the laser light source pass through the first dynamic wheel component and the second dynamic wheel component, the spatial coherence and/or the temporal coherence of the laser light source can be effectively reduced, so that the speckle effect of laser is effectively reduced, and the laser light is homogenized; furthermore, the invention utilizes a double-dynamic-wheel structure, effectively reduces the space volume of the dynamic wheel, and leads the laser light homogenizing and spot dissipating device to be small and compact.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a laser spot uniformizing and dispersing device according to the present invention.
FIG. 2 is a schematic structural diagram of a first dynamic wheel assembly according to a preferred embodiment of the present invention.
FIG. 3 is a schematic structural view of a second preferred embodiment of the first dynamic wheel assembly of the present invention.
FIG. 4 is a schematic structural view of a third preferred embodiment of the first dynamic wheel assembly of the present invention.
FIG. 5 is a schematic structural view of a fourth preferred embodiment of the dynamic wheel assembly of the present invention.
Detailed Description
The invention provides a laser light homogenizing and spot dissipating device, which is further detailed in the following in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic structural diagram of a preferred embodiment of a laser speckle homogenizing and dispersing device is provided, as shown in the figure, including a beam shrinking lens assembly 200, a first dynamic wheel assembly 300 including a first diffusion sheet or a first phase sheet, and a second dynamic wheel assembly 400 including a second diffusion sheet or a second phase sheet; the beam-shrinking lens assembly 200, the first dynamic wheel assembly 300 and the second dynamic wheel assembly 400 are sequentially arranged from near to far according to the light-emitting direction of the laser light source; in this embodiment, the beam reducing lens assembly 200 is used to compress the aperture of the laser light source 100, the first dynamic wheel assembly 300 is used to reduce the temporal coherence or spatial coherence of the laser light source, and the second dynamic wheel assembly 400 is used to reduce the spatial coherence or temporal coherence of the laser light source.
In some embodiments, as shown in fig. 1, the first dynamic wheel assembly 300 further includes a fixed bracket 310, a first diffusion plate or a first phase plate disposed on the fixed bracket 310, and a driving structure 320 for driving the fixed bracket to vibrate, wherein the driving structure can drive the first diffusion plate or the first phase plate on the fixed bracket to perform offset vibration in a horizontal or vertical direction; the second dynamic wheel assembly 400 includes a second driving motor 410, and a second driving wheel 420 connected to the second driving motor 410, wherein a second phase plate or a second diffusion plate is fixedly disposed on the second driving wheel 420, and the second driving motor can drive the second phase plate or the second diffusion plate on the second driving wheel to rotate at a high speed. When the light speed emitted by the laser light source passes through the first diffusion sheet or the first phase sheet which is in offset vibration in the horizontal or vertical direction and the second diffusion sheet or the second diffusion sheet which rotates at a high speed, the spatial coherence and/or the temporal coherence of the laser light source can be effectively reduced, so that the speckle effect of the laser is effectively reduced, and the homogenization effect on the laser is achieved.
In a preferred embodiment, as shown in fig. 1, the laser light source 100 is preferably RGB three-color laser, and the beam reduction lens assembly 200 for compressing the aperture of the laser light source 100 includes a convex lens 210 disposed between the laser light source 100 and the first dynamic wheel assembly 300, and a concave lens 220 disposed between the convex lens 210 and the first dynamic wheel assembly 300. After the aperture of the laser light source is compressed by the beam-reducing lens assembly, the speckle effect and the uniform light effect of the laser can be conveniently reduced subsequently.
Preferably, as shown in fig. 1, the laser speckle dispersing and homogenizing device further includes a coupling lens 500 disposed between the first dynamic wheel assembly 300 and the second dynamic wheel assembly 400, and a light guide light pass 600 disposed behind the second dynamic wheel assembly 400.
In a preferred embodiment, when a first phase plate is disposed on the fixing bracket of the first dynamic wheel assembly 300 and a second diffusion plate is fixedly disposed on the second driving wheel of the second dynamic wheel assembly 400, the phase characteristics of the laser light source are changed after the light beam emitted by the laser light source passes through the first phase plate, thereby reducing the temporal coherence of the laser light source; when the light beams emitted by the laser light source continuously pass through the second diffusion sheet, the number of the independent laser light sources is increased, so that the spatial coherence of the laser light source is reduced, the speckle effect of the laser light source can be greatly reduced by reducing the spatial coherence and the temporal coherence of the laser light source, and the homogenization effect on the laser light source is achieved.
Preferably, in this embodiment, the diffusion half angle of the second diffusion sheet is controlled to be between 3.5 ° and 7 °, if the diffusion half angle of the second diffusion sheet is too small (less than 3.5 °), the homogenization and speckle elimination effects are insufficient, and if the diffusion half angle of the second diffusion sheet is too large (greater than 7 °), the light velocity coupling into and passing through the light guide is not facilitated, and the incident angle of the outgoing light beam is increased, which results in a decrease in the effective light beam utilization rate entering the DMD chip.
In a preferred embodiment, when a first diffusion sheet is disposed on the fixing support of the first dynamic wheel assembly 300, and a second diffusion sheet is fixedly disposed on the second driving wheel of the second dynamic wheel assembly 400, the light beam emitted by the laser source sequentially passes through the first diffusion sheet and the second diffusion sheet, so that the spatial coherence of the laser source can be effectively reduced, the speckle effect of the laser source can also be reduced, and the laser source is homogenized.
Preferably, in this embodiment, the diffusion half angle of the first diffusion sheet is controlled to be 1.5 ° -3 °, if the diffusion half angle of the first diffusion sheet is too small (less than 1.5 °), the homogenization and speckle elimination effects are insufficient, and if the diffusion half angle of the first diffusion sheet is too large (more than 3 °), the coupling of the rear end light beams is not facilitated, which may cause a decrease in coupling efficiency. More preferably, in this embodiment, the second diffusion sheet has a half diffusion angle of 3.5 ° to 7 °, and similarly if the half diffusion angle of the second diffusion sheet is too small (less than 3.5 °), the homogenization and speckle elimination effects are insufficient, and if the half diffusion angle of the second diffusion sheet is too large (greater than 7 °), the light is not easily coupled into and guided through by the light velocity, and the incident angle of the outgoing light beam is increased, which results in a decrease in the effective light beam utilization rate entering the DMD chip.
In a preferred embodiment, when the first phase plate is disposed on the fixing bracket of the first dynamic wheel assembly 300, and the second phase plate is disposed on the second dynamic wheel of the second dynamic wheel assembly 400, the time coherence of the laser light source can be effectively reduced after the light beam emitted by the laser light source sequentially passes through the first phase plate and the second phase plate, and the speckle effect of the laser light source can also be reduced, and the laser light source is homogenized.
In a preferred embodiment, when a first diffusion sheet is disposed on the fixing bracket of the first dynamic wheel assembly 300 and a second phase plate is fixedly disposed on the second dynamic wheel of the second dynamic wheel assembly 400, the spatial coherence of the laser light source is reduced after the light beam emitted by the laser light source passes through the first diffusion sheet; when the light beam emitted by the laser light source continuously passes through the second phase plate, the time coherence of the laser light source is reduced, the speckle effect of the laser light source can be greatly reduced by reducing the space coherence and the time coherence of the laser light source, and meanwhile, the homogenization effect is achieved on the laser light source.
In a preferred embodiment, as shown in fig. 2, the first dynamic wheel assembly 300 further includes a sliding bracket 330, one end of the fixed bracket 310 is connected to the sliding bracket 330 through a spring 340, and the other end of the fixed bracket 310 is provided with a magnet S end or a magnet N end; the driving structure 320 includes a first driving motor 321, and a first driving wheel 322 connected to the first driving motor 321, wherein at least one magnet S end and at least one magnet N end are uniformly disposed on the first driving wheel 322.
In this embodiment, as shown in fig. 2, for example, the fixing bracket is provided with a magnet S end, and the first driving wheel is provided with two magnet S ends and two magnet N ends, the first driving motor drives the first driving wheel to rotate at a high speed, and when the magnet N end on the first driving wheel rotates to a side close to the magnet S end on the fixing bracket, the magnet N end on the first driving wheel and the magnet S end on the fixing bracket attract each other, so that the fixing bracket drives the first phase plate or the first diffusion plate to move downward; when the end of the magnet S on the first driving wheel rotates to a side close to the end of the magnet S on the fixed support, the end of the magnet S on the first driving wheel and the end of the magnet S on the fixed support repel each other, so that the fixed support drives the first phase plate or the first diffusion plate to move upwards. In this embodiment, the frequency, the amplitude, and the vibration direction of the vibration of the first phase plate or the first diffusion plate in the vertical direction may be adjusted by changing the number of the permanent magnets on the first driving wheel, the size of the permanent magnets, and the rotation speed of the first driving motor.
Preferably, in this embodiment, one end of the fixing bracket is connected to the sliding bracket through a spring, so that the first phase plate or the first diffusion plate on the fixing bracket is prevented from being displaced too much in the vertical direction.
In a preferred embodiment, as shown in fig. 3, the first dynamic wheel assembly 300 further includes a sliding bracket 330, one end of the fixed bracket 310 is connected to the sliding bracket 330 through a spring 340, and the other end of the fixed bracket 310 is provided with a magnet S end or a magnet N end; the drive structure 320 includes an ac power source 323 and an electromagnetic coil 324 electrically connected to the ac power source.
In this embodiment, after the electromagnetic coil is energized with the ac power supply, the N/S polarity and magnitude of the electrodes at the two ends of the pure iron on the electromagnetic coil can be changed by changing the current direction and magnitude of the ac power supply, so as to control the frequency, amplitude and direction of the vibration of the first phase plate or the first diffusion plate on the fixing bracket in the vertical direction.
In a preferred embodiment, as shown in fig. 4, the first dynamic wheel assembly 300 further includes a sliding bracket 330, the left and right ends of the fixed bracket 310 are connected to the sliding bracket 330 through springs 340, and the bottom end of the fixed bracket 310 is provided with a magnet S end and a magnet N end; the drive structure 320 includes an ac power source 323 and an electromagnetic coil 324 electrically connected to the ac power source. More preferably, the top end of the fixed bracket 310 is connected to the sliding bracket 330 by the spring 340.
In this embodiment, after the electromagnetic coil is energized with the ac power supply, the N/S polarity and magnitude of the electrodes at the two ends of the pure iron on the electromagnetic coil can be changed by changing the current direction and magnitude of the ac power supply, so as to control the frequency, amplitude and direction of vibration of the first phase plate or the first diffusion plate on the fixing bracket in the horizontal direction.
In a preferred embodiment, the first dynamic wheel assembly 310 further comprises an elastic plate 350, one end of the elastic plate 350 is fixedly arranged, the other end of the elastic plate 350 is provided with a magnet S end or a magnet N end, and the middle region of the elastic plate 350 is fixedly connected with the fixed bracket 310 through a screw 360; the drive structure 320 includes an ac power source 323 and an electromagnetic coil 324 electrically connected to the ac power source.
In this embodiment, after the electromagnetic coil is energized with the ac power supply, the N/S polarity and magnitude of the electrodes at the two ends of the pure iron on the electromagnetic coil can be changed by changing the current direction and magnitude of the ac power supply, so as to control the frequency, amplitude and direction of vibration of the first phase plate or the first diffusion plate on the fixing bracket in the horizontal and vertical directions.
In summary, the present invention provides a laser speckle homogenizing and dispersing device, which includes a first dynamic wheel assembly for reducing temporal coherence or spatial coherence of a laser light source, and a second dynamic wheel assembly for reducing spatial coherence or temporal coherence of the laser light source, wherein when a light beam emitted by the laser light source passes through the first dynamic wheel assembly and the second dynamic wheel assembly, the spatial coherence and/or temporal coherence of the laser light source can be effectively reduced, so as to effectively reduce speckle effect of the laser light, and homogenize the laser light.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (8)
1. A laser light homogenizing and spot dissipating device is characterized by comprising a beam shrinking lens assembly, a first dynamic wheel assembly comprising a first diffusion sheet or a first phase sheet and a second dynamic wheel assembly comprising a second diffusion sheet or a second phase sheet;
the beam shrinking lens assembly, the first dynamic wheel assembly and the second dynamic wheel assembly are sequentially arranged from near to far according to the light emitting direction of the laser light source;
the first dynamic wheel assembly further comprises a fixed support and a driving structure for driving the fixed support to vibrate, and the first diffusion sheet or the first phase sheet is arranged on the fixed support; the second dynamic wheel assembly further comprises a second driving motor and a second driving wheel connected with the second driving motor, the second phase plate or the second diffusion plate is arranged on the second driving wheel, and the second driving motor drives the second phase plate or the second diffusion plate on the second driving wheel to rotate at a high speed.
2. The laser spot homogenizing and dispersing device according to claim 1, wherein the first dynamic wheel assembly further comprises a sliding bracket, one end of the fixed bracket is connected with the sliding bracket through a spring, and the other end of the fixed bracket is provided with a magnet end S or a magnet end N; the driving structure is used for forming attractive force and repulsive force with the end S of the magnet or the end N of the magnet on the fixed support to drive the fixed support to vibrate.
3. The laser spot dodging and dispersing device of claim 2, wherein the driving structure comprises a first driving motor, a first driving wheel connected with the first driving motor, and at least one magnet S end and at least one magnet N end are uniformly arranged on the first driving wheel.
4. The laser speckle homogenizing and dispersing device of claim 2, wherein the driving structure comprises an ac power source and an electromagnetic coil electrically connected to the ac power source.
5. The laser spot homogenizing and dispersing device according to claim 1, wherein the first dynamic wheel assembly further comprises a sliding bracket, the left end and the right end of the fixed bracket are connected with the sliding bracket through springs, and the bottom end of the fixed bracket is provided with a magnet S end and a magnet N end; the driving structure comprises an alternating current power supply and an electromagnetic coil electrically connected with the alternating current power supply.
6. The laser spot homogenizing and dispersing device according to claim 1, wherein the first dynamic wheel assembly further comprises an elastic plate, one end of the elastic plate is fixedly arranged, the other end of the elastic plate is provided with a magnet S end or a magnet N end, and the middle area of the elastic plate is fixedly connected with the fixing bracket through a screw; the driving structure comprises an alternating current power supply and an electromagnetic coil electrically connected with the alternating current power supply.
7. The laser spot homogenizing and dispersing device of claim 1, wherein when the fixing bracket is provided with a first diffusion sheet and the second driving wheel is fixedly provided with a second diffusion sheet, the diffusion half angle of the first diffusion sheet is 1.5-3 degrees, and the diffusion half angle of the second diffusion sheet is 3.5-7 degrees.
8. The laser spot homogenizing and dispersing device of claim 1, further comprising a coupling lens disposed between the first dynamic wheel assembly and the second dynamic wheel assembly, and a light conducting light path disposed behind the second dynamic wheel assembly.
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| CN201811629741.0A CN111381382B (en) | 2018-12-28 | 2018-12-28 | Laser light homogenizing and spot dissipating device |
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| CN201811629741.0A CN111381382B (en) | 2018-12-28 | 2018-12-28 | Laser light homogenizing and spot dissipating device |
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| CN111381382A CN111381382A (en) | 2020-07-07 |
| CN111381382B true CN111381382B (en) | 2021-11-23 |
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| CN112764297B (en) * | 2020-12-30 | 2022-04-22 | 深圳市火乐科技发展有限公司 | Dynamic diffusion sheet assembly, control method, laser speckle-dispersing device and projector |
| CN113641062B (en) * | 2021-08-16 | 2023-03-14 | 深圳市火乐科技发展有限公司 | Diffuser assembly, light beam speckle eliminating device and projector |
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| CN201993525U (en) * | 2011-03-27 | 2011-09-28 | 山东大学 | Laser-beam uniform-light shaping and spot-dissipating device |
| EP3070939A1 (en) * | 2013-11-12 | 2016-09-21 | IUCF-HYU (Industry-University Cooperation Foundation Hanyang University) | Speckle suppression unit and laser projection imaging device having same |
| CN109061895A (en) * | 2016-09-06 | 2018-12-21 | 海信集团有限公司 | A kind of dissipation spot component, laser light source and laser projection device |
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