Speckle eliminating structure and optical machine
By stacking and setting optical elements in the light beam direction and driving them to move with the driving module, the speckle problem in the laser projection device is solved, and a better display effect is achieved.
Patent Information
- Application Number
- CN202422393572.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-27
AI Technical Summary
In existing laser projection equipment, the high coherence of laser light leads to speckle problems in projected images, and the existing speckle-dissipated structure is not effective.
By stacking at least two optical elements in the light beam passing direction and driving these optical elements to move in a specific direction using a driving module to reduce the coherence of the light source light, a random phase change is generated in combination with dynamic optical element movement.
It effectively reduces the coherence of light source light, weakens the speckle of the projected image from the two dimensions of space and time, and improves the display effect.
Smart Images
Figure CN223244905U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical technology, and in particular to a speckle-eliminating structure and an optical machine including the speckle-eliminating structure. Background Art
[0002] Current laser projection systems still suffer from speckle in their images. Due to the high coherence of laser light, static reflective diffusers or static transmissive diffusers are often used to reduce speckle. However, the speckle reduction effect of these optical components remains poor. Utility Model Content
[0003] The present application discloses a speckle elimination structure and an optical machine, which are beneficial for reducing speckle.
[0004] In a first aspect, the present application relates to a speckle elimination structure, comprising:
[0005] base;
[0006] a first supporting module, supported on the base, comprising a first fixing member, the first fixing member being provided with a first light-transmitting portion for the light beam to pass through, and the first fixing member being fixed with at least two optical elements stacked and arranged along a direction in which the light beam passes through, the at least two optical elements being arranged corresponding to the first light-transmitting portion along the direction in which the light beam passes through, the at least two optical elements being used to transmit light from a light source and reduce coherence of the light from the light source;
[0007] The driving module is used to drive the first carrying module to move relative to the base at least along a first direction so that all the optical elements move relative to the base at least along the first direction simultaneously.
[0008] The speckle-eliminating structure provided in the embodiment of the present application reduces the coherence of the light source light by stacking at least two optical elements along the direction of light beam penetration, which is beneficial to spatially reducing the coherence of the light source light after passing through the speckle-eliminating mechanism, thereby facilitating reduction of the speckle of the projected image of the optical machine using the speckle-eliminating mechanism. Furthermore, by providing a driving module to drive all the optical elements to move simultaneously relative to the base at least along the first direction, when the light passes through the moving optical elements, the coherence of the light source light can be further reduced due to the light generating more random phases, which is beneficial to temporally reducing the coherence of the light source light after passing through the speckle-eliminating mechanism, thereby further facilitating reduction of the speckle of the projected image of the optical machine using the speckle-eliminating mechanism, thereby improving the display effect of the optical machine using the speckle-eliminating mechanism.
[0009] In one embodiment, the first fixing member fixes a first optical element and a second optical element stacked along the direction of light beam transmission, the first optical element is a transmissive diffuser, and the second optical element is a depolarization prism; or the first optical element is a depolarization prism, and the second optical element is a transmissive diffuser; the first optical element and the second optical element are both arranged corresponding to the first light-transmitting portion along the direction of light beam transmission.
[0010] In one embodiment, the first carrying module further includes at least one first elastic member, the first elastic member is connected to the first fixing member, and the first elastic member is configured to be deformable along the first direction so that the first fixing member moves relative to the base.
[0011] In one embodiment, the first supporting module includes two first elastic members, which are arranged along the first direction and are respectively disposed on both sides of the first fixing member. Each of the first elastic members includes a first elastic portion and a first connecting portion connected to the first elastic portion. The first connecting portion is connected to the first fixing member. The first elastic portion is provided with a plurality of first through holes. The first fixing member is partially embedded in the first elastic portion through the first through holes.
[0012] When the driving module drives the first carrying module to move along the first direction relative to the base, the first elastic portion is configured to generate elastic deformation to enable the first fixing member to reciprocate.
[0013] In one embodiment, the speckle elimination structure further includes a second carrying module, which is carried on the base on the same side as the first carrying module, and the driving module is further used to drive the second carrying module to move relative to the base along a second direction so that all the optical elements move simultaneously relative to the base along the second direction, and the second direction is perpendicular to the first direction.
[0014] In one embodiment, the second carrying module includes at least one second elastic member and a second fixing member, the second elastic member is connected to the base and the second fixing member, the second elastic member is configured to be deformable along the second direction so that the second fixing member moves relative to the base, and the second fixing member is connected to the second elastic member and the first carrying module;
[0015] The second carrying module is connected to the first carrying module so that the first carrying module moves in the first direction and the second direction at the same time, so that when the second carrying module moves in the second direction, the optical element moves in the first direction and the second direction at the same time.
[0016] In one embodiment, the second supporting module includes two second elastic members, which are arranged along the second direction and are respectively disposed on two sides of the second fixing member.
[0017] In one embodiment, each of the second elastic members includes a second elastic portion and a second connecting portion connected to the second elastic portion, the second connecting portion is connected to the base and the second fixing member, the second elastic portion is provided with a plurality of second through holes, and the second fixing member is partially embedded in the second elastic portion through the second through holes;
[0018] When the driving module drives the second carrying module to move relative to the base along the second direction, the second elastic portion is configured to generate elastic deformation to enable the second fixing member to reciprocate.
[0019] In one embodiment, the driving module drives the first supporting module and the second supporting module to move by electromagnetic driving.
[0020] In one embodiment, the first fixing member includes a first frame and a first opening formed around the first frame, the first opening forms the first light-transmitting portion for the light beam to pass through, and the first frame extends toward a direction close to the first opening to form a plurality of clamping platforms, and the clamping platforms are used to clamp the optical element.
[0021] In a second aspect, the present application relates to an optical machine, comprising:
[0022] a light source module, configured to emit light from a light source; and
[0023] As described in any of the above embodiments, the speckle-eliminating structure is used to receive and emit light from the light source.
[0024] The optical machine provided in the embodiments of the present application, by providing the speckle-eliminating structure described in any of the above embodiments, is conducive to spatially reducing the coherence of the light source light after passing through the speckle-eliminating mechanism when the light source light passes through at least two stacked optical elements, thereby helping to reduce the speckle of the image projected by the optical machine; and by providing a driving module to drive all the optical elements to move simultaneously relative to the base at least along the first direction, when the light passes through the moving optical elements, the coherence of the light source light can be further reduced because the light will generate more random phases, which is conducive to temporally reducing the coherence of the light source light after passing through the speckle-eliminating mechanism, and further helping to further reduce the speckle of the image projected by the optical machine, thereby helping to improve the display effect of the optical machine. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] 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.
[0026] Figure 1 Schematic diagram of the structure of the speckle elimination structure in one embodiment of the present application.
[0027] Figure 2 yes Figure 1 Exploded structure diagram.
[0028] Figure 3 1 is an exploded schematic diagram of the first fixing member holding platform and the optical element in one embodiment of the present application.
[0029] Figure 4 This is a structural diagram of three optical elements fixed on a first fixing member in one embodiment of the present application.
[0030] Figure 5 This is a structural schematic diagram of a first fixing member fixing three optical elements in another embodiment of the present application.
[0031] Figure 6 Schematic diagram of the structure of the second optical element in one embodiment of the present application.
[0032] Figure 7 Schematic diagram of the optical path of an optical element before movement in one embodiment of the present application.
[0033] Figure 8 Schematic diagram of the optical path after the optical element moves in one embodiment of the present application.
[0034] Figure 9 Schematic diagram of an optical engine in one embodiment of the present application.
[0035] Description of main component symbols
[0036] Speckle elimination structure 100
[0037] Base 1
[0038] Board 11
[0039] Fixing portion 13
[0040] Fixed via 13a
[0041] First carrier module 3
[0042] First fixing member 31
[0043] First light-transmitting portion 31 a
[0044] First frame 313
[0045] Card holder 313a
[0046] First opening 315
[0047] Optical element 32
[0048] First optical element 321
[0049] Second optical element 323
[0050] First wedge prism 3231
[0051] Inclined surfaces 3231a, 3233a
[0052] Vertical surfaces 3231b, 3233b
[0053] Optical axes 3231c, 3233c
[0054] Second wedge prism 3233
[0055] Thickness d1
[0056] First elastic member 33
[0057] The first elastic portion 331
[0058] First via hole 331a
[0059] First connection portion 333
[0060] Second carrier module 5
[0061] Second fixing member 51
[0062] Second elastic member 53
[0063] The second elastic portion 531
[0064] Second via hole 531a
[0065] Second connecting portion 533
[0066] Driver module 7
[0067] Optical Engine 900
[0068] Light source module 91
[0069] First direction X
[0070] Second direction Y
[0071] Beam penetration direction Z
[0072] Light source L1 DETAILED DESCRIPTION
[0073] 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.
[0074] 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.
[0075] 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.
[0076] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.
[0077] The images projected by laser projection equipment are prone to speckle problems. One solution is to set a single dynamic transmission diffuser at the light output position of each light source module of the projection device. However, the diffusion angle of the above-mentioned dynamic transmission diffuser is often too small, making it difficult to significantly reduce the coherence of the light source, that is, it is difficult to achieve the purpose of eliminating speckle. Another solution is to further reduce the coherence of the light source by adjusting the vibration mode, vibration amplitude and vibration frequency of the dynamic transmission diffuser. However, with the change of vibration mode, vibration amplitude and vibration frequency, not only the volume of the optical machine will increase, but also the cost of the projection equipment and the noise during the operation of the projection equipment will increase, thereby affecting the user experience.
[0078] Please also refer to Figure 1 and Figure 2The speckle reduction structure 100 of the present embodiment includes a base 1, a first carrier module 3, a second carrier module 5, and a drive module 7. The first carrier module 3 is fixed with at least two optical elements 32. The drive module 7 is configured to drive the first carrier module 3 to move relative to the base 1 at least along a first direction X so that all optical elements 32 move simultaneously relative to the base 1 at least along the first direction X. The first carrier module 3 is connected to the second carrier module 5. The drive module 7 is further configured to drive the second carrier module 5 to move relative to the base 1 along a second direction Y so that all optical elements 32 move simultaneously relative to the base 1 along the second direction Y, where the second direction Y is perpendicular to the first direction X.
[0079] The base 1 comprises a plate body 11 and a plurality of fixing portions 13 extending from the plate body 11 toward one side and approximately perpendicular to the main body 11. Each fixing portion 13 defines a fixing hole 13a, through which the base 1 and the second supporting module 5 can be screwed. When the speckle-reducing structure 100 is used in an optical engine of a projection device, the speckle-reducing structure 100 and the optical engine housing (not shown) can also be screwed together through the fixing holes 13a. The base 1 is generally plate-shaped and can be made of any of metal, glass, and plastic.
[0080] Please also refer to Figure 2 and Figure 3 The first supporting module 3 is supported on the base 1 and includes a first fixing member 31 and at least one first elastic member 33. The first fixing member 31 is provided with a first light-transmitting portion 31a for the light beam to pass through. In this embodiment, the first fixing member 31 is fixed with two stacked optical elements 32. The two optical elements 32 are arranged corresponding to the first light-transmitting portion 31a along the light beam passing direction Z. The two optical elements 32 are used to transmit the light source L1 and reduce the coherence of the light source L1. In other embodiments, please refer to Figure 4 and Figure 5 The first fixing member 31 may also be fixed with three or more optical elements 32, which is not limited in the present application. For example, when the first fixing member 31 is fixed with three optical elements 32, two of the optical elements 32 are arranged corresponding to the first light-transmitting portion 31a along the light beam passing direction Z, and the other optical element 32 can be arranged on the side of the above-mentioned two optical elements 32 close to the base 1 or on the side away from the base 1.
[0081] Please refer to Figure 2 and Figure 3Specifically, the first fixing member 31 includes a first frame 313 and a first opening 315 formed around the first frame 313. The first opening 315 forms a first light-transmitting portion 31a through which the light beam passes. In this embodiment, the first light-transmitting portion 31a is formed by the first opening 315. In other embodiments, the first fixing member 31 may also include the first frame 313 and a transparent member (not shown) engaged with the first frame 313. The transparent member is made of a light-transmitting material, such as glass or plastic. Since the transparent member is light-transmitting, it forms the first light-transmitting portion 31a through which the light beam passes. The optical element 32 is fixed to the side of the transparent member close to the base 1 or the side away from the base 1.
[0082] A plurality of holding platforms 313a are formed on the inner wall of the first frame 313 facing the first opening 315. The plurality of holding platforms 313a are distributed on the inner wall of the first frame 313 along the light beam penetration direction Z. The holding platforms 313a are used to clamp the optical element 32. The holding platforms 313a can be platforms protruding from the inner wall of the first frame 313 toward the first opening 315, or can be notches directly opened on the inner wall of the first frame 313 and passing through the first opening 315. It is sufficient as long as the optical element 32 can be clamped in the first opening 315. In this embodiment, the first fixing member 31 is fixed with a first optical element 321 and a second optical element 323 stacked along the light beam penetration direction Z. The first optical element 321 is fixed to the holding platform 313a formed on the first frame 313 in a direction away from the base 1, and the second optical element 323 is fixed to the holding platform 313a formed on the first frame 313 in a direction close to the base 1. Please refer to Figure 4 In other embodiments, the first fixing member 31 fixes three optical elements 32 stacked along the light beam transmission direction Z. One optical element 32 is fixed to a holding platform 313a formed on the first frame 313 away from the base 1, another optical element 32 is fixed to a holding platform 313a formed on the first frame 313 close to the base 1, and another optical element 32 is fixed between the two optical elements 32. This application does not impose any restrictions.
[0083] Please also refer to Figure 2 and Figure 6 In this embodiment, the first optical element 321 is a transmissive diffuser, and the second optical element 323 is a depolarizing prism. Both the first optical element 321 and the second optical element 323 are arranged corresponding to the first light-transmitting portion 31a along the light beam transmission direction Z. The first optical element 321 includes a main body (not shown) and a diffusion layer (not shown) arranged on either side of the main body. The diffusion layer is used to receive light and reduce the coherence of the incident light before emitting it. By providing a transmissive diffuser, the emitted light exhibits a Lambertian distribution, which is beneficial for further reducing the coherence of the light source L1.
[0084] See also Figure 6The second optical element 323 includes a first wedge-shaped prism 3231 and a second wedge-shaped prism 3233. The inclined surface 3231a of the first wedge-shaped prism 3231 and the inclined surface 3233a of the second wedge-shaped prism 3233 are in contact with each other. The optical axis of the first wedge-shaped prism 3231 is defined as a first optical axis 3231c, and the optical axis of the second wedge-shaped prism 3233 is defined as a second optical axis 3233c. The angle between the first optical axis 3231c and the second optical axis 3233c is 45°±1°. For example, the angle between the first optical axis 3231c and the second optical axis 3233c can be any value of 44°, 45°, or 46°. When the angle between the first optical axis 3231c and the second optical axis 3233c is 45°±1°, the effect of eliminating speckles after the light source light L1 passes through the first wedge-shaped prism 3231 and the second wedge-shaped prism 3233 is the best. In practical applications, there may be a certain error in the angle between the first optical axis 3231c and the second optical axis 3233c, and this application does not impose any restrictions on this.
[0085] Specifically, the first wedge-shaped prism 3231 further includes a vertical surface 3231b. The inclined surface 3231a is inclined relative to the vertical surface 3231b. A wedge angle is formed between the vertical surface 3231b and the inclined surface 3231a. The second wedge-shaped prism 3233 further includes a vertical surface 3233b. The inclined surface 3233a is inclined relative to the vertical surface 3233b. A wedge angle is formed between the vertical surface 3233b and the inclined surface 3233a. When the inclined surface 3231a of the first wedge-shaped prism 3231 and the inclined surface 3233a of the second wedge-shaped prism 3233 are aligned, the vertical surface 3231b of the first wedge-shaped prism 3231 and the vertical surface 3233b of the second wedge-shaped prism 3233 are parallel to each other. In other words, the wedge angle of the first wedge-shaped prism 3231 and the wedge angle of the second wedge-shaped prism 3233 are equal. The light source light L1 is vertically incident on the first wedge-shaped prism 3231 from the vertical surface 3231 b and is vertically emitted from the vertical surface 3233 b of the second wedge-shaped prism 3233 .
[0086] Please also refer to Figure 6 、 Figure 7 and Figure 8Taking the first wedge-shaped prism 3231 as an example, the distance between the vertical surface 3231b and the inclined surface 3231a is defined as the thickness d1 of the first wedge-shaped prism 3231. Due to the presence of the inclined surface 3231a, different positions on the first wedge-shaped prism 3231 have different thicknesses d1. Because the beam cross-section of the light source L1 has a certain size, different light rays within the light source L1 beam enter and exit from different positions on the first wedge-shaped prism 3231. Thus, different light rays within the light source L1 beam pass through the first wedge-shaped prism 3231, each having a different thickness d1. This results in different optical path lengths between the vertical surface 3231b and the inclined surface 3231a for light rays at different positions within the light source L1 beam. Consequently, different light rays within the light source L1 beam passing through the first wedge-shaped prism 3231 experience different phase delays, which helps to spatially reduce the coherence of the light source L1. Furthermore, by setting a driving module 7 to drive the first supporting module 3 to move at least along the first direction X relative to the base 1, all the optical elements 32 can move simultaneously at least along the first direction X relative to the base 1. Since the light source L1 at the same position at different times further produces different phase delays, it is beneficial to further reduce the coherence of the light source L1 in time.
[0087] In other embodiments, the first optical element 321 may be a depolarization prism, and the second optical element 323 may be a transmissive diffuser, which is not limited in the present application.
[0088] Please refer to Figure 1 and Figure 2 The first elastic member 33 is connected to the first fixing member 31. The first elastic member 33 is configured to deform along the first direction X so as to enable the first fixing member 31 to move relative to the base 1. In this embodiment, the first supporting module 3 includes two first elastic members 33, which are arranged along the first direction X and are respectively disposed on either side of the first fixing member 31. Each first elastic member 33 includes a first elastic portion 331 and a first connecting portion 333 connected to the first elastic portion 331. The first connecting portion 333 is connected to the first fixing member 31. The first elastic portion 331 defines a plurality of first through-holes 331a. The first fixing member 31 is partially embedded in the first elastic portion 331 through the first through-holes 331a.
[0089] When the driving module 7 drives the first carrier module 3 to move relative to the base 1 in the first direction X, the first elastic portion 331 is configured to generate elastic deformation to cause the first fixing member 31 to reciprocate. The provision of the first elastic portion 331 allows the first fixing member 31 to reciprocate through its elastic action, thereby reducing the power consumption of the driving module 7 and further reducing the noise of the speckle reduction mechanism. In other embodiments, the first carrier module 3 may include one, three, or more first elastic members 33, depending on the specific application requirements and not limited in this application.
[0090] Please refer to Figure 1 and Figure 2 The second carrier module 5 and the first carrier module 3 are supported on the same side of the base 1, and the second carrier module 3 surrounds the first carrier module 3. The second carrier module 5 includes a second fixing member 51 and at least one second elastic member 53. The second elastic member 53 connects the base 1 and the second fixing member 51. The second elastic member 53 is configured to deform along the second direction Y to allow the second fixing member 51 to move relative to the base 1. The second fixing member 51 is connected to the second elastic member 53 and the first carrier module 3. The second carrier module 5 is connected to the first carrier module 3 so that the first carrier module 3 moves in the second direction Y simultaneously with the first direction X. When the second carrier module 5 moves in the second direction Y, the optical element 32 moves in the second direction Y simultaneously with the first direction X.
[0091] In this embodiment, the second carrier module 5 includes two second elastic members 53, arranged along the second direction Y and disposed on either side of the second fixing member 51. Each second elastic member 53 includes a second elastic portion 531 and a second connecting portion 533 connected to the second elastic portion 531. The second connecting portion 533 connects the base 1 and the second fixing member 51. The second elastic portion 531 defines a plurality of second through-holes 531a, through which the second fixing member 51 is partially embedded. When the driving module 7 drives the second carrier module 5 to move relative to the base 1 along the second direction Y, the second elastic portion 531 is configured to generate elastic deformation to cause the second fixing member 51 to reciprocate. The provision of the second elastic portion 531 allows the reciprocating motion of the second fixing member 51 to be achieved through the elastic action of the second elastic portion 531, thereby reducing the power consumption of the driving module 7 and further reducing the noise of the despeckle mechanism. In other embodiments, the second carrying module 5 may further include one, three or more second elastic members 53 , which is determined according to usage requirements and is not limited in this application.
[0092] In this embodiment, the drive module 7 drives the movement of the first and second carrier modules 3 and 5 through electromagnetic drive. This electromagnetic drive helps reduce noise generated during the movement of the first and second carrier modules 3 and 5, and reduces the operating noise of the speckle reduction mechanism, thereby improving the user experience. In other embodiments, the drive module 7 can also drive the movement of the first and second carrier modules 3 and 5 through electrical drive, such as a motor, and this application is not limited thereto.
[0093] The speckle-eliminating structure 100 provided in the embodiment of the present application reduces the coherence of the light source light L1 by stacking at least two optical elements 32 along the light beam penetration direction Z, which is beneficial to spatially reducing the coherence of the light source light L1 after passing through the speckle-eliminating mechanism, thereby facilitating reducing the speckle of the projected image of the optical machine using the speckle-eliminating mechanism; and by providing a driving module 7 to drive all the optical elements 32 to move simultaneously relative to the base 1 at least along the first direction X. When the light passes through the moving optical element 32, the light will generate more random phases, which can further reduce the coherence of the light source light L1, which is beneficial to temporally reducing the coherence of the light source light L1 after passing through the speckle-eliminating mechanism, thereby further reducing the speckle of the projected image of the optical machine using the speckle-eliminating mechanism, and improving the display effect of the optical machine using the speckle-eliminating mechanism.
[0094] Please also refer to Figure 2 and Figure 9 The optical engine 900 of the embodiment of the present application includes a light source module 91 and a speckle reduction mechanism. The light source module 91 is used to emit light source light L1. The speckle reduction mechanism 100 is used to receive and emit light source light L1.
[0095] The optical engine 900 may also include a light homogenizing component (not shown), a light valve (not shown) and a lens component (not shown). The light homogenizing component is arranged on the side of the speckle elimination mechanism that emits the light source light L1. The light homogenizing component is used to receive the light source light L1 emitted from the speckle elimination mechanism and homogenize the light source light L1. By setting the light homogenizing component, it is not only beneficial to uniformize the light intensity of the light source light L1 but also beneficial to achieve a good speckle elimination effect. The light valve is arranged on the light output side of the light homogenizing component and is used to receive the light source light L1 after homogenization and modulate the light source light L1 into image light (not shown). The light valve can be any one of a liquid crystal display imaging device (Liquid Crystal Display, LCD), a digital micro-mirror device (Digital Micro-mirror Device, DMD) and a liquid crystal on silicon device (Liquid Crystal on Silicon, LCOS). The lens assembly is used to receive the image light emitted from the light valve and project the image light out at a certain magnification.
[0096] The optical machine 900 provided in the embodiment of the present application is provided with the speckle elimination structure 100 described in any of the above embodiments. When the light source light L1 passes through at least two stacked optical elements 32, it is beneficial to spatially reduce the coherence of the light source light L1 after passing through the speckle elimination mechanism 100, thereby helping to reduce the speckle of the image projected by the optical machine 900; and by providing a driving module 7 to drive all optical elements 32 to move simultaneously relative to the base 1 at least along the first direction X, when the light passes through the moving optical element 32, the coherence of the light source light L1 can be further reduced because the light will generate more random phases, which is beneficial to temporally reduce the coherence of the light source light L1 after passing through the speckle elimination mechanism, and further help to further reduce the speckle of the projected image of the optical machine 900, and help to improve the display effect of the optical machine 900.
[0097] 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 speckle elimination structure, characterized in that: include: base; a first supporting module, supported on the base, comprising a first fixing member, the first fixing member being provided with a first light-transmitting portion for the light beam to pass through, and the first fixing member being fixed with at least two optical elements stacked and arranged along a direction in which the light beam passes through, the at least two optical elements being arranged corresponding to the first light-transmitting portion along the direction in which the light beam passes through, the at least two optical elements being used to transmit light from a light source and reduce coherence of the light from the light source; The driving module is used to drive the first carrying module to move relative to the base at least along a first direction so that all the optical elements move relative to the base at least along the first direction simultaneously.
2. The speckle elimination structure according to claim 1, wherein: The first fixing member fixes a first optical element and a second optical element stacked along the direction of light beam transmission, wherein the first optical element is a transmissive diffuser and the second optical element is a depolarization prism; or the first optical element is a depolarization prism and the second optical element is a transmissive diffuser; the first optical element and the second optical element are both arranged corresponding to the first light-transmitting portion along the direction of light beam transmission.
3. The speckle elimination structure according to claim 1, wherein: The first carrying module further includes at least one first elastic member, the first elastic member is connected to the first fixing member, and the first elastic member is configured to be deformable along the first direction so as to enable the first fixing member to move relative to the base.
4. The speckle elimination structure according to claim 3, wherein: The first supporting module includes two first elastic members, which are arranged along the first direction and are respectively disposed on both sides of the first fixing member. Each of the first elastic members includes a first elastic portion and a first connecting portion connected to the first elastic portion. The first connecting portion is connected to the first fixing member. The first elastic portion is provided with a plurality of first through holes. The first fixing member is partially embedded in the first elastic portion through the first through holes. When the driving module drives the first carrying module to move along the first direction relative to the base, the first elastic portion is configured to generate elastic deformation to enable the first fixing member to reciprocate.
5. The speckle elimination structure according to claim 1, wherein: The speckle elimination structure further includes a second carrying module, which is carried on the base on the same side as the first carrying module. The driving module is further used to drive the second carrying module to move relative to the base along a second direction so that all the optical elements move simultaneously relative to the base along the second direction, where the second direction is perpendicular to the first direction.
6. The speckle elimination structure according to claim 5, wherein: The second supporting module includes at least one second elastic member and a second fixing member, the second elastic member is connected to the base and the second fixing member, the second elastic member is configured to be deformable along the second direction so that the second fixing member moves relative to the base, and the second fixing member is connected to the second elastic member and the first supporting module; The second carrying module is connected to the first carrying module so that the first carrying module moves in the first direction and the second direction at the same time, so that when the second carrying module moves in the second direction, the optical element moves in the first direction and the second direction at the same time.
7. The speckle elimination structure according to claim 6, wherein: The second supporting module includes two second elastic members, which are arranged along the second direction and are respectively disposed on two sides of the second fixing member.
8. The speckle elimination structure according to claim 7, wherein: Each second elastic member includes a second elastic portion and a second connecting portion connected to the second elastic portion, the second connecting portion is connected to the base and the second fixing member, the second elastic portion is provided with a plurality of second through holes, and the second fixing member is partially embedded in the second elastic portion through the second through holes; When the driving module drives the second carrying module to move relative to the base along the second direction, the second elastic portion is configured to generate elastic deformation to enable the second fixing member to reciprocate.
9. The speckle elimination structure according to claim 5, wherein: The driving module drives the first carrying module and the second carrying module to move by electromagnetic driving.
10. The speckle elimination structure according to claim 1, wherein: The first fixing member includes a first frame and a first opening formed around the first frame, the first opening forming the first light-transmitting portion for the light beam to pass through, the first frame extending toward the direction close to the first opening to form a plurality of clamping platforms, the clamping platforms being used to clamp the optical element.
11. An optical machine, characterized in that: include: A light source module, used for emitting light from a light source; as well as The speckle-eliminating structure according to any one of claims 1 to 10, wherein the speckle-eliminating structure is configured to receive and emit light from the light source.