Fly-eye lens and ray machine
By setting micromirror groups of different shapes, curvatures or sizes in the compound eye lens, the problem of poor coherence of existing compound eye lenses is solved, effectively eliminating laser speckle and improving the image quality of laser projection.
Patent Information
- Application Number
- CN202421999287.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-16
AI Technical Summary
Existing compound-eye lenses have poor coherence removal, resulting in astigmatism problems in laser projection images.
The micromirror unit designed for compound eyes is based on at least two micromirror groups. The shape, curvature or size of the micromirror units in any adjacent micromirror group is different. The laser beam is modulated uniformly through different micromirror groups to eliminate the coherence of the laser.
Improves the uniformity effect, effectively eliminates laser speckle, and improves the image quality of laser projection.
Smart Images
Figure CN223244954U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of optical lenses, and in particular includes a fly-eye lens and an optical machine including the fly-eye lens. Background Art
[0002] Common laser projector optics typically use a compound-eye lens to homogenize the laser beam. This lens consists of multiple hexagonal micromirrors arranged in a honeycomb pattern and all of the same size. However, due to the laser beam's strong coherence and the uniformity of the size and shape of each micromirror, even with angular integration of the laser beam, decoherence is still poor, resulting in astigmatism in the laser projected image. Utility Model Content
[0003] The present application discloses a compound eye lens and an optical machine, which can effectively eliminate speckles formed by laser beam projection.
[0004] In a first aspect, the present application relates to a compound eye lens, comprising:
[0005] substrate;
[0006] A plurality of micromirror units are formed on the surface of the substrate;
[0007] The plurality of micromirror units form at least two micromirror groups, wherein the same micromirror group includes a plurality of micromirror units having the same shape, curvature, and projection size in a first direction perpendicular to the surface of the substrate; and at least one of the shape, curvature, or projection size in the first direction of the micromirror units in any two adjacent micromirror groups is different.
[0008] The compound eye lens provided in the embodiments of the present application is provided with at least two micromirror groups including at least two micromirror units with at least one different shape, curvature or size. This allows the laser light to be modulated and homogenized by different micromirror units when passing through different micromirror groups. After the laser light is emitted from the compound eye lens, the different homogenization effects of the different micromirror units can better eliminate the coherence of the laser light, thereby improving the homogenization effect and further eliminating laser speckle.
[0009] In one embodiment, the micromirror units in the same micromirror group have the same working angle; and the micromirror units in any two adjacent micromirror groups have different working angles.
[0010] In one embodiment, a projection of the micromirror units in at least one of the micromirror groups in the first direction is a polygon that does not include a hexagon.
[0011] In one embodiment, each of the micromirror groups is used to receive light of a wavelength band, and different micromirror groups receive light of different wavelength bands.
[0012] In one embodiment, the micromirror units in each micromirror group have different sizes, and the longer the wavelength of light, the larger the size of the micromirror unit corresponding to the light.
[0013] In one embodiment, each of the micromirror groups is used to receive light of multiple wavelength bands, and the optical powers of the lights of any wavelength band received by different micromirror groups are equal.
[0014] In a second aspect, the present application also relates to an optical machine, comprising:
[0015] A light source module, used for emitting light from a light source;
[0016] a beam shaping module, for guiding the light from the light source and homogenizing the light from the light source, the beam shaping module comprising the above-mentioned fly-eye lens; and
[0017] The light modulation chip is used to receive and modulate the light source light homogenized by the beam shaping module.
[0018] The optical machine provided in the embodiment of the present application can homogenize the light of the light source by setting the compound eye lens in the above embodiment, thereby better eliminating the coherence of the light of the light source, improving the homogenization effect, and further achieving the effect of eliminating speckle.
[0019] In one embodiment, the light source includes a plurality of sub-light sources of different wavelength bands, each of the micromirror groups receives the sub-light sources of one wavelength band, and the micromirror units in the micromirror group corresponding to the sub-light sources of each wavelength band have the same size.
[0020] In one embodiment, the light source includes a plurality of sub-light source lights of different wavelength bands, and the micromirror group having the same shape, curvature, and projection size in a first direction perpendicular to the surface of the substrate as the micromirror units simultaneously receives the sub-light source lights of each wavelength band, and the light power of the sub-light source lights of each wavelength band received by the micromirror group having at least one different shape, curvature, and projection size in the first direction perpendicular to the surface of the substrate as the micromirror units.
[0021] In one embodiment, the beam shaping module further includes a light homogenizing element, which is disposed on a side of the fly-eye lens away from the light source module and is configured to receive the light source light emitted from the fly-eye lens.
[0022] In one embodiment, the beam shaping module further includes a plurality of shaping lens groups, each shaping lens group corresponding to one of the micromirror groups, and the shaping lens group is used to guide part of the light source light emitted from each micromirror group so that the light source light emitted from different micromirror groups overlaps at the light incident surface of the light homogenizing element. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0024] Figure 1 It is a schematic structural diagram of the fly-eye lens in the first embodiment provided by this application.
[0025] Figure 2 yes Figure 1 Schematic diagram of the front view structure of the compound eye lens.
[0026] Figure 3 yes Figure 1 Schematic diagram of part of the optical path of the compound eye lens.
[0027] Figure 4 Schematic diagram of the structure of the compound eye lens in the second embodiment provided by this application.
[0028] Figure 5 It is a schematic structural diagram of the compound eye lens in the third embodiment provided by this application.
[0029] Figure 6 Schematic diagram of the structure of the fly-eye lens in the fourth embodiment provided by this application.
[0030] Figure 7 It is a structural diagram of an optical machine in an embodiment provided in this application.
[0031] Figure 8 This is a schematic diagram of the light spot of the light source on the fly-eye lens in the first embodiment provided by this application.
[0032] Figure 9 This is a schematic diagram of the light spot of the light source on the fly-eye lens in the third embodiment provided by this application.
[0033] Figure 10 This is a schematic diagram of the light spot of the light source on the fly-eye lens in the fourth embodiment provided by the present application.
[0034] Figure 11 It is a structural diagram of an optical machine in another embodiment provided in this application.
[0035] Description of main component symbols
[0036] Fly-eye lens 100
[0037] Base 10
[0038] Micromirror units 30, 30a, 30b, 30c, 30d, 30e, 30f, 30g
[0039] Surfaces 31a, 31b
[0040] Micromirror groups 50, 50a, 50b, 50c, 50d, 50e, 50f, 50g
[0041] Working angles α, β
[0042] Optical axis o
[0043] Geometric center P
[0044] Optical Machine 200
[0045] Light source module 210
[0046] Beam shaping module 230
[0047] Shaping lens groups 231, 231a, 231b
[0048] Light homogenization element 233
[0049] Reflector 235
[0050] Dimming lens group 237
[0051] Beam splitter 250
[0052] Optical modulation chip 270
[0053] Lens 290
[0054] Light spots L, L1, L2, L3
[0055] First direction X
[0056] Second direction Y
[0057] The third direction Z
[0058] The following specific implementation methods will further illustrate this application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0059] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0060] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly attached to the other component or there may be a central component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a central component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.
[0061] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0062] An embodiment of the present application provides a fly-eye lens comprising a substrate and a plurality of micromirror units formed on a surface of the substrate. The plurality of micromirror units form at least two micromirror groups, wherein a single micromirror group includes a plurality of micromirror units having the same shape, curvature, and projected size in a first direction perpendicular to the surface of the substrate; at least one of the shape, curvature, or projected size in the first direction of the micromirror units in any two adjacent micromirror groups differs. By setting at least one parameter of the micromirror units in any two adjacent micromirror groups to be different, laser light can be homogenized by different micromirror groups when passing through the fly-eye lens, thereby obtaining light with different homogenization effects and thereby eliminating the coherence of the laser light.
[0063] Example 1
[0064] See also Figure 1 In a first embodiment of the present application, a fly-eye lens 100 is provided, comprising a substrate 10 and a plurality of micromirror units 30 formed on a surface of the substrate 10. The plurality of micromirror units 30 form at least two micromirror groups 50. The projections of the micromirror units 30 in the same micromirror group 50 in a first direction X are the same in size, and the projections of the micromirror units 30 in two adjacent micromirror groups 50 in the first direction X are different in size.
[0065] Specifically, in the first embodiment, a plurality of micromirror units 30 are formed on two opposite surfaces of the substrate perpendicular to the first direction X. The plurality of micromirror units 30 on the two surfaces correspond to each other in pairs. That is, the projection of a micromirror unit 30 on any one surface coincides with the projection of another corresponding micromirror unit 30 on the other surface in the first direction X, so that light incident on one micromirror unit 30 from one side of the fly-eye lens 100 can be emitted from another micromirror unit 30 arranged oppositely on the other side of the fly-eye lens 100.
[0066] See also Figure 2 In the first embodiment, the micromirror unit 30 includes micromirror units 30a and micromirror units 30b of different sizes. Multiple micromirror units 30a form a micromirror group 50a, and multiple micromirror units 30b form a micromirror group 50b. The micromirror groups 50a and 50b are arranged along the second direction Y. The size of the micromirror unit 30a is larger than that of the micromirror unit 30b. That is, the sizes of the projections of the micromirror units 30 of different micromirror groups 50 along the second direction Y along the first direction X decrease in size. In other embodiments, the sizes of the projections of the micromirror units 30 of different micromirror groups 50 along the second direction Y along the first direction X may also increase in size, which is not a limitation of this application.
[0067] See also Figure 3 The projection of each micromirror unit 30 along the first direction X is a hexagon. The curvature of the surfaces of the micromirror units 30 facing away from the substrate 10 in the same micromirror group 50 is the same, while the curvature of the surfaces of the micromirror units 30 in any two adjacent micromirror groups 50 facing away from the substrate 10 is different. That is, the operating angles of the micromirror units 30 in the same micromirror group 50 are the same, while the operating angles of the micromirror units 30 in any two adjacent micromirror groups 50 are different. Specifically, in this first embodiment, the curvature of the surface 31a of the micromirror unit 30a is different from the curvature of the surface 31b of the micromirror unit 30b. When the thickness along the optical axis o is the same, the maximum operating angle α of the micromirror unit 30a is different from the maximum operating angle β of the micromirror unit 30b. The maximum operating angle refers to the maximum angle at which the micromirror unit 30 can achieve a homogenizing effect on incident light. The range of the operating angle determines the range of homogenization of the incident light by the micromirror unit 30 and also affects the divergence angle of the light emitted from the micromirror unit 30. Therefore, after the light passes through both micromirror group 50a and micromirror group 50b, the divergence angle of the portion of light corresponding to micromirror group 50a is different from the divergence angle of the portion of light corresponding to micromirror group 50b, thereby eliminating the coherence of the combined light and facilitating the elimination of speckle.
[0068] The fly-eye lens 100 provided in the first embodiment of the present application is provided with a plurality of hexagonal micromirror units 30 on the surface of the substrate 10, and the plurality of micromirror units 30 include two sizes, so that light diverges at different angles after passing through different micromirror units. After photosynthesis of light at the two divergence angles, light with good uniformity and decoherence effects can be obtained, which is beneficial for eliminating speckles when the light is laser.
[0069] Example 2
[0070] See also Figure 4 The fly-eye lens 100 provided in the second embodiment of the present application includes a substrate 10 and a plurality of micromirror units 30 formed on a surface of the substrate 10. The plurality of micromirror units 30 form at least two micromirror groups 50. The projections of the micromirror units 30 in the same micromirror group 50 along the first direction X are the same, while the micromirror units 30 in two adjacent micromirror groups 50 have different sizes along the first direction X. The difference from the first embodiment is that the plurality of micromirror groups 50 are arranged along the second direction Y, and the size of the micromirror units 30 in any micromirror group 50 is larger than the size of the micromirror units 30 in any adjacent micromirror group 50, or the size of the micromirror units 30 in any micromirror group 50 is smaller than the size of the micromirror units 30 in any adjacent micromirror group 50.
[0071] Specifically, in this embodiment, the sizes of the micromirror units 30 in the multiple micromirror groups 50 arranged along the second direction Y are staggered. That is, along the second direction Y, the sizes of the micromirror units 30 in different micromirror groups 50 first decrease, then increase, and then decrease again. The sizes of the two alternate micromirror groups 50 can be the same or different, and this application does not impose any restrictions on this.
[0072] In other embodiments, the sizes of the micromirror units 30 in different micromirror groups 50 along the second direction Y may also be arranged in other ways, such as gradually decreasing and then gradually increasing, or gradually increasing and then gradually decreasing, or randomly arranged in size, and this application does not impose any restrictions on this.
[0073] The fly-eye lens 100 provided in the second embodiment of the present application, by staggering the sizes of the micromirror units 30 corresponding to the multiple micromirror groups 50 arranged along the second direction Y, can ensure that light is fully homogenized when passing through the multiple micromirror groups 50 at the same time, and better eliminate the coherence of the light, which is beneficial for eliminating scattered spots when the light is laser.
[0074] Example 3
[0075] See also Figure 5The fly-eye lens 100 provided in the third embodiment of the present application includes a substrate 10 and a plurality of micromirror units 30 formed on a surface of the substrate 10. The plurality of micromirror units 30 form at least two micromirror groups 50. The projections of the micromirror units 30 in the same micromirror group 50 along the first direction X have the same size, while the micromirror units 30 in two adjacent micromirror groups 50 have different sizes along the first direction X. The difference from the first embodiment is that the projections of the micromirror units 30 in different micromirror groups 50 along the first direction X have different polygonal shapes.
[0076] Specifically, in the third embodiment, the plurality of micromirror units 30 are sequentially formed along the second direction Y, including a micromirror group 50c, a micromirror group 50d, a micromirror group 50a, a micromirror group 50e, and a micromirror group 50f. The projection of the micromirror unit 30c of the micromirror group 50c in the first direction X is a square, the projection of the micromirror unit 30d of the micromirror group 50d in the first direction X is a regular pentagon, the projection of the micromirror unit 30a of the micromirror group 50a in the first direction X is a regular hexagon, the projection of the micromirror unit 30e of the micromirror group 50e in the first direction X is a regular heptagon, and the projection of the micromirror unit 30f of the micromirror group 50f in the first direction X is a regular octagon.
[0077] In other embodiments, the micromirror unit 30 may also be a polygon other than a hexagon, which is not limited in this application.
[0078] The fly-eye lens 100 provided in the third embodiment of the present application, by providing a plurality of micromirror units 30, including micromirror units 30 whose projections in the first direction X are hexagonal, and micromirror units 30 whose projections in the first direction X are not hexagonal, can enable the micromirror units 30 of different shapes to modulate the light passing through into a spatial spot distribution of corresponding shapes, thereby achieving a decoherence effect when combining the light, and further facilitating the elimination of speckle when the light is laser.
[0079] Example 4
[0080] See also Figure 6The fly-eye lens 100 provided in the fourth embodiment of the present application includes a substrate 10 and a plurality of micromirror units 30 formed on a surface of the substrate 10. The plurality of micromirror units 30 are formed into at least two micromirror groups 50. The projections of the micromirror units 30 in the same micromirror group 50 in the first direction X are the same size, the micromirror units 30 in two adjacent micromirror groups 50 have different sizes in the first direction X, and the projections of the micromirror units 30 in at least one micromirror group 50 in the first direction X are hexagonal. The difference from the first embodiment is that the plurality of micromirror units 30 are formed into a micromirror group 50a, a micromirror group 50b, and a micromirror group 50g. The micromirror groups 50a and 50b are arranged sequentially along the second direction Y, and the micromirror group 50g is disposed on one side of the micromirror groups 50a and 50b along the third direction Z and is adjacent to the micromirror groups 50a and 50b, respectively.
[0081] Specifically, the micromirror groups 50a, 50b, and 50g are arranged around the geometric center P of the projection of the substrate 10 in the first direction X, and the angles of contact with the geometric center P are all 120°. That is, the micromirror groups 50a, 50b, and 50g are divided into three equal parts with the geometric center P as the midpoint. The sizes of the micromirror units 30a of the micromirror group 50a, the sizes of the micromirror units 30b of the micromirror group 50b, and the sizes of the micromirror units 30g of the micromirror group 50g are different from each other.
[0082] In other embodiments, the plurality of micromirror groups 50 may also be arranged in other manners, such as being divided into four equal parts with the geometric center P as the midpoint, etc., and this application does not impose any limitation thereto.
[0083] The fly-eye lens 100 provided in the fourth embodiment of the present application is configured to divide the micromirror group 50a, the micromirror group 50b, and the micromirror group 50g into three equal parts with the geometric center P as the midpoint. This allows light whose optical axis coincides with the geometric center P to simultaneously illuminate the micromirror group 50a, the micromirror group 50b, and the micromirror group 50g. This ensures that the optical power of the light received by the multiple micromirror groups 50 is equal, which is beneficial for improving the uniform light effect and better achieving the decoherence effect when combining the light. This is beneficial for eliminating speckle when the light is laser.
[0084] See also Figure 7The embodiment of the present application also provides an optical machine 200, including a light source module 210, a beam shaping module 230, a beam splitter prism 250, a light modulation chip 270 and a lens 290. Among them, the light source module 210 is used to emit light source light, the beam shaping module 230 is used to guide the light source light and homogenize the light source light, and the beam shaping module 230 includes the fly-eye lens 100 in the above embodiment. The light modulation chip 270 is used to receive and modulate the light source light homogenized by the beam shaping module 230, thereby converting the light source light into image light. The beam splitter prism 250 is used to receive the light source light emitted from the beam shaping module 230 and guide the light source light to the light modulation chip 270. The beam splitter prism 250 is also used to guide the image light to the lens 290, and the lens 290 projects the image light onto the projection medium to form an image.
[0085] The light source light emitted by the light source module 210 is a laser and includes multiple sub-light source lights of different wavelength bands. Specifically, in this embodiment, the light source light emits sub-light source lights of three wavelength bands. For example, the three sub-light source lights of the three wavelength bands can be red laser, blue laser, and green laser. In other embodiments, the light source light can also emit sub-light source lights of only one wavelength band or sub-light source lights of two or more wavelength bands, and this application does not limit this.
[0086] The fly-eye lens 100 can also be configured such that a micromirror group 50 having the same shape, curvature, and projection size in the first direction X perpendicular to the surface of the substrate 10 of the micromirror unit 30 simultaneously receives the sub-light source light of each wavelength band, and a micromirror group 50 having at least one different shape, curvature, and projection size in the first direction X perpendicular to the surface of the substrate 10 of the micromirror unit 30 receives the same optical power of the sub-light source light of each wavelength band.
[0087] For example, see Figure 8 In this embodiment, the micromirror groups 50 of the same size in the micromirror unit 30 simultaneously receive the sub-light source light of each wavelength band. The micromirror groups 50 of different sizes in the micromirror unit 30 receive the sub-light source light of each wavelength band with the same optical power. Specifically, the light source light is projected onto the fly-eye lens 100 to form a light spot L. The three sub-light source lights are projected onto the fly-eye lens 100 to form light spots L1, L2, and L3, respectively.
[0088] When light spot L is irradiated onto the fly-eye lens 100 of Example 1, light spots L1, L2, and L3 all irradiate the micromirror group 50a, and light spots L1, L2, and L3 all irradiate the micromirror group 50b. Light spots L1, L2, and L3 all have uniform optical power distribution. The area irradiated by light spot L1 on micromirror group 50a is equal to the area irradiated by light spot L1 on micromirror group 50b. In other words, the optical power of light spot L1 received by micromirror group 50a and micromirror group 50b is equal. The area irradiated by light spot L2 on micromirror group 50a is equal to the area irradiated by light spot L2 on micromirror group 50b. In other words, the optical power of light spot L2 received by micromirror group 50a and micromirror group 50b is equal. The area of light spot L3 irradiated on micromirror group 50a is equal to the area of light spot L3 irradiated on micromirror group 50b. That is, the optical power of light spot L3 received by micromirror group 50a and micromirror group 50b is equal. In other embodiments, the optical power distribution of light spots L1, L2, and L3 can also be uneven. By adjusting the positions of light spots L1, L2, and L3 irradiated on fly-eye lens 100, the micromirror group 50a and micromirror group 50b can also be adjusted. This is not limited in this application.
[0089] In the embodiment of the present application, the optical power of the sub-light source light of each wavelength band received by each micromirror group 50 is set to be the same, so that each sub-light source light is evenly illuminated on each micromirror group 50, and is thus evenly illuminated by the micromirror groups 50 of different sizes in the micromirror unit 30. After being emitted from the fly-eye lens 100, the light source light can be fully evenly illuminated, which is beneficial to eliminating the coherence of the light source light and thus reducing laser speckle.
[0090] In another embodiment, the micromirror groups 50 of the same shape as the micromirror unit 30 simultaneously receive the sub-light sources of each wavelength band, and the micromirror groups 50 of different shapes as the micromirror unit 30 receive the same optical power of the sub-light sources of each wavelength band. Figure 9 When the light spot L is irradiated on the fly-eye lens 100 of the third embodiment, the light spot L1 is simultaneously irradiated on the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e, and the micromirror group 50f, and the optical power of the light spot L1 received by the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e, and the micromirror group 50f is equal. The light spot L2 is simultaneously irradiated on the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e, and the micromirror group 50f, and the optical power of the light spot L2 received by the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e, and the micromirror group 50f is equal. The light spot L3 is simultaneously irradiated on the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e and the micromirror group 50f, and the light power of the light spot L3 received by the micromirror group 50c, the micromirror group 50d, the micromirror group 50a, the micromirror group 50e and the micromirror group 50f is equal.
[0091] In the embodiment of the present application, by setting the optical power of the sub-light source light of each wavelength band received by each micromirror group 50 to be the same, each sub-light source light is evenly irradiated on each micromirror group 50, and is thus evenly evened by the micromirror groups 50 of different shapes in the micromirror unit 30. After being emitted from the fly-eye lens 100, sufficient and evenly evened light source light can be obtained, which is beneficial to eliminating the coherence of the light source light and thus reducing laser speckle.
[0092] In another embodiment, each micromirror group 50 receives only one wavelength band of sub-light source light, and the micromirror units 30 in the micromirror group 50 corresponding to each wavelength band of sub-light source light have the same size. Figure 10 The light spot L formed by the light source projecting onto the fly-eye lens 100 of the fourth embodiment is annular. The three sub-light sources project arc-shaped light spots L1, L2, and L3, respectively. Light spot L1 is formed on micromirror group 50a, light spot L2 is formed on micromirror group 50b, and light spot L3 is formed on micromirror group 50g. The longer the wavelength of the sub-light source, the larger the size of the corresponding micromirror unit 30.
[0093] In the embodiment of the present application, by configuring each micromirror group 50 to receive a sub-light source light of a certain wavelength band, micromirror units 30 of different sizes can correspond to sub-light source light of different wavelength bands, thereby utilizing the deviation in the size of the micromirror units 30 to eliminate the chromatic aberration generated by the light source light after passing through the fly-eye lens 100.
[0094] Please refer to Figure 7 In this embodiment, the beam shaping module 230 further includes a light homogenizing element 233. The light homogenizing element 233 is disposed on a side of the fly-eye lens 100 that is away from the light source module 210 along the optical path of the light source. The light homogenizing element 233 is configured to receive the light source light emitted from the fly-eye lens 100 and homogenize the light source light. The light homogenizing element 233 may be a fly-eye lens or a light homogenizing rod, and this application does not limit this.
[0095] In this embodiment, the beam shaping module 230 further includes a reflector 235 and a plurality of shaping lens groups 231. Each shaping lens group 231 is provided corresponding to a micromirror group 50. The shaping lens group 231 is used to guide a portion of the light source emitted from each micromirror group 50, and to make the light source light emitted from different micromirror groups 50 overlap at the light incident surface of the light homogenizing element 233. Specifically, taking the fly-eye lens 100 of Example 1 as an example, the beam shaping module 230 includes a shaping lens group 231a and a shaping lens group 231b. The shaping lens group 231a is provided corresponding to the micromirror group 50a and is used to guide a portion of the light source light emitted from the micromirror group 50a. The shaping lens group 231b is provided corresponding to the micromirror group 50b and is used to guide a portion of the light source light emitted from the micromirror group 50b. The light source light emitted from the shaping lens group 231 passes through the reflector 235 and is combined at the light incident surface of the light homogenizing element 233. By providing shaping lens group 231a and shaping lens group 231b, light from light sources with different divergence angles can be overlapped at the light entrance surface of light homogenizing element 233, thereby being fully homogenized by light homogenizing element 233, which helps to improve the homogenization effect. By providing reflector 235, the optical path of the light from the light source can be adjusted, thereby optimizing the spatial structure of optical engine 200.
[0096] The beam shaping module 230 further includes a dimming lens group 237 , which is disposed on the light-emitting side of the light homogenizing element 233 and is used to converge the light source light emitted by the light homogenizing element 233 and project it onto the light modulation chip 270 .
[0097] The light modulation chip 270 may be a transmissive liquid crystal display (LCD), a reflective liquid crystal on silicon (LCOS), or a digital micromirror device (DMD), which is not limited in this application.
[0098] See also Figure 11 In another embodiment, the optical machine 200 may not be provided with the reflector 235 and may only be provided with a shaping lens group 231 . The shaping lens group 231 shapes the light source light emitted by the fly-eye lens 100 and projects it into the light homogenizing element 233 .
[0099] The optical engine 200 provided in the embodiment of the present application, by adopting the fly-eye lens 100 in the above embodiment, can better homogenize the light of the light source, thereby reducing the coherence of the light source light, and further reducing the speckle projected by the light source light, which is beneficial to improving image quality and thus enhancing the user experience.
[0100] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A compound eye lens, characterized in that: include: substrate; A plurality of micromirror units are formed on the surface of the substrate; The plurality of micromirror units form at least two micromirror groups, wherein the same micromirror group contains a plurality of micromirror units having the same shape, curvature, and projection size in a first direction perpendicular to the surface of the substrate; and at least one of the shape, curvature, or projection size in the first direction of the micromirror units in any two adjacent micromirror groups is different.
2. The fly-eye lens according to claim 1, wherein: The working angles of the micromirror units in the same micromirror group are the same; the working angles of the micromirror units in any two adjacent micromirror groups are different.
3. The fly-eye lens according to claim 1, wherein: The projection of the micromirror units in the micromirror group in the first direction is a polygon.
4. The fly-eye lens according to claim 1, wherein: Each of the micromirror groups is used to receive light of a wavelength band, and different micromirror groups receive light of different wavelength bands.
5. The fly-eye lens according to claim 4, wherein: The micromirror units in each micromirror group have different sizes, and the longer the wavelength of light, the larger the size of the micromirror unit corresponding to the light.
6. The fly-eye lens according to claim 1, wherein: Each of the micromirror groups is used to receive light of multiple wavelength bands, and the optical powers of the lights of any wavelength band received by different micromirror groups are equal.
7. An optical machine, characterized in that: include: A light source module, used for emitting light from a light source; a beam shaping module, configured to guide the light from the light source and homogenize the light from the light source, the beam shaping module comprising the fly-eye lens according to any one of claims 1 to 6; as well as The light modulation chip is used to receive and modulate the light source light homogenized by the beam shaping module.
8. The optical machine according to claim 7, wherein: The light source includes a plurality of sub-light sources of different wavelength bands. Each of the micromirror groups receives the sub-light sources of one wavelength band. The micromirror units in the micromirror group corresponding to the sub-light sources of each wavelength band have the same size.
9. The optical machine according to claim 7, wherein: The light source light includes sub-light source lights of multiple different wavelength bands. The micromirror group having the same shape, curvature, and projection size in a first direction perpendicular to the surface of the substrate for the micromirror units receives the sub-light source lights of each wavelength band at the same time. The light power of the sub-light source lights of each wavelength band received by the micromirror group having at least one different shape, curvature, and projection size in the first direction perpendicular to the surface of the substrate for the micromirror units is the same.
10. The optical machine according to claim 7, wherein: The beam shaping module further includes a light homogenizing element, which is disposed on a side of the fly-eye lens away from the light source module on the optical path of the light source light and is used to receive the light source light emitted from the fly-eye lens.
11. The optical machine according to claim 10, wherein: The beam shaping module also includes a plurality of shaping lens groups, each of which corresponds to one of the micromirror groups. The shaping lens group is used to guide part of the light source light emitted from each micromirror group so that the light source light emitted from different micromirror groups overlaps on the incident surface of the light homogenizing element.