CN112764297A

CN112764297A - Dynamic diffusion sheet assembly, control method, laser speckle-dispersing device and projector

Info

Publication number: CN112764297A
Application number: CN202011613892.4A
Authority: CN
Inventors: 胡震宇; 欧阳剑; 常征
Original assignee: Shenzhen Huole Science and Technology Development Co Ltd
Current assignee: Shenzhen Huole Science and Technology Development Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-07
Anticipated expiration: 2040-12-30
Also published as: CN112764297B

Abstract

The present disclosure relates to a dynamic diffuser assembly, a control method, a laser speckle-eliminating device, and a projector, wherein the dynamic diffuser assembly includes a fixed layer and a movable layer mounted with an optical diffuser, and further includes a driving part and a controller connected with the driving part, the driving part is configured to: the moving layer is driven to move relative to the fixed layer in a first direction and a second direction, respectively, in a plane parallel to the optical diffuser. This dynamic diffusion piece subassembly adopts the arrangement of layering, the fixed bed remains motionless, drive division drive removes the layer and drives the optical diffusion piece and move on two directions, a certain point on the optical diffusion piece has the motion flexibility ratio of two dimensions, compare with traditional rotary-type diffusion piece, bigger area of coverage, can make full use of the different phase divergence angles on the optical diffusion piece, the area that actually used under the same circumstances of size is bigger, improve the area utilization ratio of dynamic diffusion piece, weaken the coherence of laser better, realize eliminating the speckle effect better.

Description

Dynamic diffusion sheet assembly, control method, laser speckle-dispersing device and projector

Technical Field

The disclosure relates to the technical field of laser projection, in particular to a dynamic diffusion sheet assembly, a control method, a laser speckle dispersing device and a projector.

Background

The laser projection display technology can reproduce rich and gorgeous colors of an objective world most truly and provide shocking expressive force, wherein speckle elimination is a relatively popular research subject in the laser projection technology, the principle of the laser projection display technology is mainly that coherence of laser in space and time is reduced, and a plurality of groups of diffusion sheets are arranged at different positions of a light path in the conventional laser speckle elimination device so as to achieve the effect of speckle elimination.

The diffusion sheet is divided into a static diffusion sheet and a Dynamic diffusion sheet (Dynamic Optical Diffuser), the existing Dynamic diffusion sheet is mostly in a rotary type diffusion wheel form, the principle is the superposition of a plurality of independent speckle patterns in unit time, and under the condition of a certain rotating speed, the random phase quantity of the diffusion sheet in unit time is increased, so that a better speckle eliminating effect can be obtained. The diffuser near the laser source is used to eliminate smaller spots and the smaller diffuser size is required, but for a rotary type diffuser wheel, the smaller diffuser size provides less random phase and poor speckle elimination. In addition, the size of the diffusion wheel needs to be increased by matching with a rotating wheel with a larger size, the practical application area is limited, the maximization of the diffusion sheet application area cannot be realized, and meanwhile, the transmission structure of the whole diffusion wheel is also huge. Therefore, for a rotating type diffusion wheel, a diffusion sheet of a corresponding size cannot provide a corresponding number of random phases, and the speckle reduction effect is greatly compromised.

Disclosure of Invention

The first purpose of this disclosure is to provide a dynamic diffusion sheet subassembly, this dynamic diffusion sheet subassembly can solve current rotary-type diffusion wheel and can't realize the maximize of applied area, influences the technical problem of whole speckle reduction effect.

It is a second object of the present disclosure to provide a laser speckle reduction apparatus that uses the dynamic diffuser assembly provided by the present disclosure.

A third object of the present disclosure is to provide a projector using the laser speckle reduction device provided by the present disclosure.

A fourth object of the present disclosure is to provide a control method of a dynamic diffuser assembly capable of maximizing a utilization area of an optical diffuser, and providing a better spot-removing effect with the same size.

In order to achieve the above object, the present disclosure provides a dynamic diffuser assembly including a fixed layer and a moving layer on which an optical diffuser is mounted, the dynamic diffuser assembly further including a driving part and a controller connected to the driving part, the driving part being configured to: the moving layer is driven to move relative to the fixed layer in a first direction and a second direction, respectively, in a plane parallel to the optical diffuser.

Optionally, the fixed layer and the movable layer are respectively configured as a square sheet structure, the driving part is arranged at an edge of the square sheet structure, and the extending directions of two adjacent edges of the square sheet structure are respectively the first direction and the second direction; optionally, the driving portion includes a plurality of sets disposed between the fixed layer and the moving layer, and the controller controls the plurality of sets of driving portions driving the moving layer in the first direction to synchronously operate, and controls the plurality of sets of driving portions driving the moving layer in the second direction to synchronously operate.

Optionally, the fixed layer includes a base and a flexible circuit board fixed on the base, the driving portion includes an electrical coil fixed on the flexible circuit board and a driving magnet fixed on the moving layer, the driving magnet is located right above the electrical coil, and the controller is connected to the electrical coil; optionally, the driving magnet is a bipolar permanent magnet, and the N pole and the S pole of the bipolar permanent magnet are arranged along the corresponding movement direction; or the driving magnet is a multi-magnetic pole permanent magnet, and the N pole and the S pole of the magnet monomer in the multi-magnetic pole permanent magnet are arranged along the direction vertical to the motion plane.

Optionally, the movable layer comprises a support, and a clamping groove for fixing the driving magnet is formed on the bottom wall of the support.

Optionally, the mobile layer includes the support, the support have with optics diffusion piece shape matched with mounting hole, be formed with the groove of dodging that supporting part and a plurality of interval set up on the internal perisporium of mounting hole, optics diffusion piece is fixed on the supporting part, it is a plurality of dodge the groove and extend to the supporting part.

Optionally, the fixed layer and the movable layer are arranged at intervals up and down and are connected in the height direction through a plurality of elastic supporting pieces. Optionally, the fixed layer and the movable layer are respectively configured to be square sheet structures, connecting pieces are respectively arranged at four corners of each square sheet structure, a U-shaped opening is formed in each connecting piece, and two ends of each elastic supporting piece are respectively welded and fixed at the U-shaped openings of the fixed layer and the movable layer.

Optionally, the dynamic diffuser assembly further comprises a detection element disposed on the fixed layer for detecting the moving layer motion information, the detection element being connected to the controller.

Optionally, the fixed layer includes the base and fixes flexible circuit board on the base, the drive division is including fixing circular telegram coil on the flexible circuit board and fixing drive magnet on the removal layer, detecting element is located under drive magnet, be formed with the mounting groove on the roof of base, detecting element is located in the mounting groove and fix on flexible circuit board's the diapire.

According to a second aspect of the present disclosure, there is also provided a laser speckle dispersing device, comprising a laser, a beam reduction assembly, a light homogenizing assembly, and a scattering member disposed between the beam reduction assembly and the light homogenizing assembly, wherein the scattering member comprises the above dynamic diffusion sheet assembly.

According to a third aspect of the present disclosure, there is also provided a projector including the laser speckle reduction device provided by the present disclosure.

According to a fourth aspect of the present disclosure, there is also provided a control method of a dynamic diffuser assembly, the dynamic diffuser assembly being the above dynamic diffuser assembly, the control method including: and controlling the moving layer to move along the first direction and the second direction simultaneously, so that the moving layer moves spirally relative to the fixed layer.

Through the technical scheme, the dynamic diffusion piece subassembly that this disclosure provided adopts the arrangement of layering, the fixed bed remains motionless, drive division drive removes the layer and drives the optical diffusion piece and move on two directions, a certain point on the optical diffusion piece has the motion flexibility ratio of two dimensions, compare with traditional rotary-type diffusion piece, bigger coverage area, can make full use of the different phase divergence angle on the optical diffusion piece, the area that actually utilizes under the condition that the size is the same is bigger, improve the area utilization ratio of dynamic diffusion piece, weaken the coherence of laser better, realize eliminating the speckle effect better. In addition, the controller can automatically control the movement amount of the moving layer in two directions, so that the speckle eliminating effect of the diffusion sheet is extremely good, and the automatic intelligent control of the speckle eliminating process is realized.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic structural view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 2 is an exploded view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 3 is a top view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of a section A-A of the dynamic diffuser assembly of FIG. 3 according to an exemplary embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of a section A-A of a dynamic diffuser assembly provided in another exemplary embodiment of the present disclosure in FIG. 3;

FIG. 6 is an enlarged partial view of a dynamic diffuser assembly provided in an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic view of a dynamic diffuser assembly motion pattern provided by an exemplary embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a motion trajectory of a point on an optical diffuser in a dynamic diffuser assembly provided by an exemplary embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a laser speckle reduction apparatus provided in an exemplary embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a laser speckle reduction apparatus provided in an exemplary embodiment of the present disclosure;

fig. 11 is a flowchart of a dynamic diffuser control method according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

The optical fiber sensor comprises a fixed layer, a base 10, a mounting groove 101, a flexible circuit board 11, a moving layer 2, a support 20, a mounting hole 201, a supporting part 202, an avoidance groove 203, a clamping groove 204, an optical diffusion sheet 23, a driving part 3, an electrified coil 31, a driving magnet 32, a magnet monomer 321, an elastic supporting part 5, a connecting sheet 6, a U-shaped opening 60, a detection element 7, a laser 100, a beam shrinking component 200, a light homogenizing component 300, a scattering component 400 and a collimating component 500.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of directional terms such as "upper", "lower", "top", "bottom", "left" and "right" generally refer to those defined in the context of normal use of the dynamic diffuser provided by the present disclosure, and specifically refer to the drawing directions shown in fig. 4 and 5, where "inner" and "outer" refer to the inner and outer of the respective part profiles. Moreover, when the following description refers to the accompanying drawings, like reference numbers in different drawings identify the same or similar elements.

The present disclosure provides a dynamic diffuser assembly, as shown in fig. 1 and 2, including a fixed layer 1 and a moving layer 2 on which an optical diffuser 23 is mounted, a driving part 3 and a controller connected to the driving part 3, the driving part 3 being configured to: the moving layer 2 is driven to move relative to the fixed layer 1 in a first direction and a second direction, respectively, in a plane parallel to the optical diffuser sheet 23, i.e., in a horizontal plane.

Here, it should be noted that the first direction and the second direction may be two directions forming any angle with each other in a horizontal plane, for example, the first direction and the second direction are perpendicular to each other as an example, which will be described in detail below. The driving part 3 may be any suitable structure for driving the moving layer 2 to move, such as a rack and pinion mechanism, a ball screw mechanism, a linear motor, etc. The dynamic diffusion sheet assembly is not limited to two layers as shown in the figure, for example, a moving layer 2 may be added below a fixed layer 1, optical diffusion sheets 23 are respectively fixed on the two moving layers 2, and the two moving layers 2 can respectively move relative to the fixed layer 2, which all belong to the protection scope of the present disclosure.

As shown in fig. 7 and 8, the first direction may be an X direction, the second direction may be a Y direction, the moving layer 2 may move relative to the fixed layer 1 in both the first direction and the second direction, a moving locus of a point on the optical diffusion sheet 23 is a spiral type, and a moving locus of a point on the conventional rotation type diffusion sheet is a circle where the point is located, and thus, the moving locus of the spiral type has a larger coverage area. In other embodiments, the movable layer 2 may move a certain distance in the first direction relative to the fixed layer 1 and then move in the second direction relative to the fixed layer 1, and the movement locus of a certain point on the optical diffusion sheet 23 is a spiral zigzag shape, which increases the coverage area compared with the conventional rotary diffusion sheet, and falls within the protection scope of the present disclosure.

Through the technical scheme, the dynamic diffusion piece subassembly that this disclosure provided adopts the arrangement of layering, fixed layer 1 remains motionless, 3 drive of drive division moves layer 2 and drives optical diffusion piece 23 and move on two directions, a certain point on optical diffusion piece 23 has the motion flexibility ratio on two dimensions, compare with traditional rotary-type diffusion piece, bigger coverage area, can make full use of the different phase divergence angle on the optical diffusion piece 23, the area that actually utilizes under the same circumstances of size is bigger, improve the area utilization ratio of dynamic diffusion piece, weaken the coherence of laser better, realize eliminating the speckle effect better. In addition, the controller can automatically control the movement amount of the moving layer in two directions, so that the speckle eliminating effect of the diffusion sheet is extremely good, and the automatic intelligent control of the speckle eliminating process is realized.

Specifically, as shown in fig. 3 and 7, the fixed layer 1 and the movable layer 2 may be respectively configured as a square sheet structure, the driving portion 3 is disposed at an edge portion of the square sheet structure, and the extending directions of two adjacent edges of the square sheet structure are respectively the first direction and the second direction, so that the driving portion 3 is disposed along the corresponding moving direction, and does not interfere and stop the movement of the movable layer 2, and the fluency of the movement in two directions can be ensured.

In order to ensure the driving action on the moving layer 2, the driving part 3 comprises a plurality of groups arranged between the fixed layer 1 and the moving layer 2, and the plurality of groups of driving parts 3 are respectively arranged along each edge of the square sheet structure, wherein the controller controls the plurality of groups of driving parts for driving the moving layer to synchronously act along the first direction and controls the plurality of groups of driving parts for driving the moving layer to synchronously act along the second direction. That is, in the present embodiment, four sets of driving portions 3 are provided and respectively disposed on each side of the square sheet structure, the controller controls the driving portions 3 on two opposite sides to synchronously operate, the sets of driving portions for driving the moving layer 2 to move in the X direction simultaneously operate, and the sets of driving portions for driving the moving layer 2 to move in the Y direction simultaneously operate, so as to increase the driving force for the moving layer 2, and make the moving layer 2 move more smoothly relative to the fixed layer 1.

The drive section 3 may be any suitable mechanism. In the present embodiment, as shown in fig. 2, the fixed layer 1 includes a base 10 and a Flexible Printed Circuit (FPC) 11 fixed to the base 10, the driving unit 3 includes an energizing coil 31 fixed to the Flexible Printed Circuit 11 and a driving magnet 32 fixed to the moving layer 2, the driving magnet 32 is positioned directly above the energizing coil 31, and the controller is connected to the energizing coil 31. Specifically, taking the arrangement shown in fig. 4 as an example, the current on the left side of the energized coil 31 is directed into the paper and the current on the right side is directed out of the paper, the direction of the lorentz force applied to the energized coil 31 is leftward according to the left-hand rule, the direction of the reaction force of the lorentz force applied to the driving magnet 32 is rightward due to the fixed layer 1 being fixed, the driving section 3 drives the moving layer 2 to move rightward in the X direction, and when the direction of the current in the energized coil 31 is changed, the direction of the movement is opposite, i.e., leftward in the X direction. Similarly, the driving principle in the Y direction is similar to that in the Y direction, and by controlling the direction and magnitude of the current in the energized coil 31, the moving layer 2 can be driven to move the optical diffusion sheet 23 in two dimensions. In addition, the driving mode of the electrified coil 31 and the driving magnet 32 is adopted, so that the arrangement is convenient, the arrangement form of the driving part 3 is simplified, and the control is relatively easier.

In this embodiment, the electrical coil 31 can be formed by winding the existing electrical connection wire on the flexible circuit board 11, and does not occupy the height of the whole dynamic diffusion sheet assembly Z, and the electrical coil 31 is directly arranged in the flexible circuit board 11 to become a part of the flexible circuit board 11, so that the conventional coil assembling processes such as winding, welding, dispensing and fixing can be omitted. The movable layer 2 comprises a support 20, a clamping groove 204 for fixing the driving magnet 32 is formed in the bottom wall of the support 20, the driving magnet 32 can be fixed in the clamping groove 204 in a dispensing mode, the support 20 can be a plastic support, and the driving magnet 32 is nested in the support 20 and does not occupy more Z-direction space.

The driving magnet 32 can be a permanent magnet or an electromagnet, the arrangement of the permanent magnet is relatively simpler, an electric connection line is not needed, and particularly, under the condition that the driving magnet 32 needs to be embedded into the support 20, the disorder of the spatial layout of the electric connection line can be avoided.

Specifically, as shown in fig. 4, the driving magnet 32 may be a bipolar permanent magnet, and N and S poles of the bipolar permanent magnet are arranged in the corresponding moving direction; or as shown in fig. 5, the driving magnet 32 may be a multi-pole permanent magnet, and the N pole and S pole of the magnet unit 321 in the multi-pole permanent magnet are arranged along a direction perpendicular to the movement plane (horizontal plane), and the plurality of magnet units 321 may be assembled together by dispensing, when assembling, the magnetic pole directions of two adjacent magnet units 321 are opposite, and the assembling firmness is further ensured under the action of magnetic force, and the driving magnet 32 is designed as a multi-pole permanent magnet, so that the magnetic induction line density of the nearby magnetic field can be increased, and accordingly the lorentz force for driving the moving layer 2 to move can be increased, and is particularly suitable for a heavier optical diffusion sheet 23 or a structural member moving together with the optical diffusion sheet 23.

There are various ways in which the optical diffuser 23 is fixed to the moving layer 2. In the present disclosure, as shown in fig. 2, the support 20 has a mounting hole 201 matching with the shape of the optical diffusion sheet 23, for example, the optical diffusion sheet 23 is circular, the mounting hole 201 is a circular through hole, a support portion 202 and a plurality of avoiding grooves 203 arranged at intervals are formed on the inner peripheral wall of the mounting hole 201, the optical diffusion sheet 23 is fixed on the support portion 202, the plurality of avoiding grooves 203 extend to the support portion 202, the bottom wall of the optical diffusion sheet 23 can be fixed on the support portion 202 by dispensing, the plurality of avoiding grooves 203 not only can facilitate the mounting and taking out of the optical diffusion sheet 23, but also can form a dispensing opening between the avoiding grooves 203 and the optical diffusion sheet 23, thereby facilitating the dispensing operation, and fixing the optical diffusion sheet 23 on the support 20.

Further, in the present disclosure, as shown in fig. 1, the fixed layer 1 and the moving layer 2 are arranged at an interval from top to bottom to ensure that the moving layer 2 can move freely relative to the fixed layer 1, and in order to achieve connection between the fixed layer and the moving layer in the height direction, as an exemplary embodiment of the present disclosure, the fixed layer 1 and the moving layer 2 are connected in the height direction by a plurality of elastic supporting members 5, specifically, the elastic supporting members 5 may be a wire spring, a thin wire, a metal spring plate, and the like, and both ends of each of the elastic supporting members are welded and fixed to the support 20 and the base 10, respectively.

For convenience of welding, as shown in fig. 6, the four corners of the fixed layer 1 and the movable layer 2 are respectively provided with a connecting sheet 6, a U-shaped opening 60 is formed on the connecting sheet 6, two ends of the elastic supporting member 5 are respectively welded and fixed at the U-shaped openings 60 of the fixed layer 1 and the movable layer 2, and two ends of the elastic supporting member 5 can be installed in the connecting sheet 6 through the U-shaped openings 60 and then fixed by soldering, so that the assembly is facilitated, and the welding process is simplified. In addition, since the assembly stability of the connecting piece 6 is directly related to the effective length of the welded elastic supporting members 5, since the connecting piece 60 can be insert-molded into the holder 10 to ensure the connection rigidity of each elastic supporting member 5 in both directions, the stability and the accuracy of the relative position of the connecting piece 60 can be ensured.

In another exemplary embodiment of the present disclosure, the fixing of the fixed layer 1 and the moving layer 2 in the height direction may be achieved by applying a pre-magnetic force in the Z direction, and specifically, a metal sheet may be fixed below the flexible circuit board 11, the metal sheet being located directly below the driving magnet 32, and the connection of the moving layer 2 and the fixed layer 1 in the height direction may be achieved by a magnetic attraction force of the driving magnet 32 to the metal sheet. By means of the connection of the elastic supports 5, it is ensured that the moving layer 2 moves in both the X-direction and the Y-direction due to the connection of the elastic supports 5. Through the connection mode of the pre-applied magnetic force, the movement of the moving layer 2 in the X direction and the Y direction are independent of each other, and can be moved simultaneously or independently, and a suitable connection mode can be selected according to design requirements, which is not limited by the disclosure. In the present embodiment, the metal piece is wide enough to ensure that the magnetic attraction force with the metal piece is only in the Z direction when the driving magnet 32 moves, and no component force is generated in the X direction or the Y direction, thereby avoiding generation of a resistance force opposite to the driving lorentz force.

Further, in the present disclosure, as shown in fig. 2, the dynamic diffuser assembly further includes a detection element 7 disposed on the fixed layer 1 for detecting motion information of the moving layer 2, and the detection element 7 is connected to the controller. When the driving magnet 32 is a bipolar permanent magnet, the detecting element 7 may be a Tunnel magnetoresistive sensor (TMR), and when the driving magnet 32 is a multi-pole permanent magnet, the detecting element 7 may be a linear hall sensor, and the position relationship of the driving magnet 32 with respect to the detecting element 7 is determined by the angle change of the induced magnetic field, so as to convert the position information of the driving magnet 32 into an electrical signal and feed back the electrical signal to the controller, and the controller further controls the energizing coil 31 to perform corresponding positive compensation or negative compensation on the driving current of the energizing coil, so as to accurately control the motion process of the optical diffusion sheet 23.

Specifically, as shown in fig. 4 and 5, a mounting groove 110 is formed on the top wall of the base 10, the detection element 7 is located in the mounting groove 110 and fixed on the bottom wall of the flexible circuit board 11, and does not occupy the mounting space in the Z direction, and meanwhile, the detection element 7 is fixed right below the driving magnet 32, so that the accuracy of acquiring the position information of the driving magnet 32 can be ensured. More specifically, the detecting element 7 may be fixed on the bottom wall of the flexible circuit board 11 by using a Surface Mount Technology (Surface Mount Technology), and the detecting element 7 may be fixed after being directly mounted without opening a mounting hole on the flexible circuit board 11, which is simple and convenient to operate.

According to the second aspect of the present disclosure, as shown in fig. 9, there is also provided a laser speckle dissipating device, which includes a laser 100, a beam reduction assembly 200, a light uniformizing assembly 300, and a scattering member 400 disposed between the beam reduction assembly 200 and the light uniformizing assembly 300, wherein the scattering member 400 includes the above-described dynamic diffusion sheet assembly, the beam reduction assembly 200 may be a set of galilean-architecture telescopes, the objective lens is a positive meniscus lens, and the secondary lens is a negative biconcave lens. The light homogenizing assembly 300 may employ a fly-eye lens or a light homogenizing rod. In addition, in the present disclosure, as shown in fig. 10, a collimating element 500 may be further disposed between the scattering element 400 and the light homogenizing assembly 300, and the collimating element 500 may be a sheet or a group of condensing lenses, and the laser speckle elimination device can fully utilize different phase divergence angles at all positions on the optical diffusion sheet 23, and provide a better speckle elimination effect at the same size.

According to a third aspect of the present disclosure, there is also provided a projector including the laser speckle reduction device provided by the present disclosure, and the projector has all the benefits of the above dynamic diffusion plate assembly and laser speckle reduction device, and will not be described in detail herein.

According to a fourth aspect of the present disclosure, as shown in fig. 11, there is also provided a control method of a dynamic diffusion sheet, which may be the above-described dynamic diffusion sheet assembly, the control method including: step 1001, controlling the moving layer 2 to move along the first direction and the second direction at the same time, so that the moving layer 2 moves spirally relative to the fixed layer 1, and thus, the motion track of a certain point on the optical diffusion sheet 23 is spiral, the laser spot passing path with the minimum diffusion area reaching the maximum can be achieved, the capability of eliminating the laser speckle of the dynamic diffusion sheet can be greatly improved by the long and non-repeated motion path of the laser spot, and enough random phases can be provided even under the condition of a smaller diffusion sheet size, so that the design that the laser speckle can be eliminated by adopting a smaller structure is realized.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A dynamic diffuser assembly comprising a fixed layer (1) and a moving layer (2) on which an optical diffuser (23) is mounted, said dynamic diffuser assembly further comprising a drive part (3) and a controller connected to said drive part (3), said drive part (3) being configured to: -driving the moving layer (2) in a first and a second direction, respectively, with respect to the fixed layer (1), in a plane parallel to the optical diffuser (23).

2. The dynamic diffuser assembly according to claim 1, wherein the fixed layer (1) and the moving layer (2) are respectively configured as a square sheet structure, the driving part (3) is disposed at an edge of the square sheet structure, and the extending directions of two adjacent edges of the square sheet structure are the first direction and the second direction, respectively; preferably, the first and second electrodes are formed of a metal,

the driving part (3) comprises a plurality of groups arranged between the fixed layer (1) and the movable layer (2), the controller controls the driving of the plurality of groups of driving parts of the movable layer (2) to synchronously act along the first direction, and controls the driving of the plurality of groups of driving parts of the movable layer (2) to synchronously act along the second direction.

3. The dynamic diffuser assembly according to claim 1, wherein the fixed layer (1) comprises a base (10) and a flexible circuit board (11) fixed on the base (10), the driving part (3) comprises an electrical coil (31) fixed on the flexible circuit board (11) and a driving magnet (32) fixed on the moving layer (2), the driving magnet (32) is located directly above the electrical coil (31), and the controller is connected with the electrical coil (31); preferably, the first and second electrodes are formed of a metal,

the driving magnet (32) is a bipolar permanent magnet, and the N pole and the S pole of the bipolar permanent magnet are arranged along the corresponding movement direction;

or the driving magnet (32) is a multi-magnetic pole permanent magnet, and the N pole and the S pole of the magnet single body (321) in the multi-magnetic pole permanent magnet are arranged along the direction vertical to the motion plane.

4. The dynamic diffuser assembly of claim 1, wherein said moving layer (2) comprises a support (20), said support (20) having a mounting hole (201) matching the shape of said optical diffuser (23), said mounting hole (201) having an inner peripheral wall formed with a support (202) and a plurality of spaced-apart avoiding grooves (203), said optical diffuser (23) being fixed to said support (202), said plurality of avoiding grooves (203) extending to said support (202).

5. The dynamic diffuser assembly of any of claims 1-4, characterized in that the fixed layer (1) and the moving layer (2) are spaced up and down and connected in height direction by a plurality of resilient supports (5); preferably, the first and second electrodes are formed of a metal,

the fixed layer (1) and the movable layer (2) are respectively constructed into a square sheet structure, connecting sheets (6) are respectively arranged at four corners of the square sheet structure, U-shaped openings (60) are formed in the connecting sheets (6), and two ends of the elastic supporting piece (5) are respectively welded and fixed at the U-shaped openings (60) of the fixed layer (1) and the movable layer (2).

6. A dynamic diffuser assembly according to claim 1, further comprising a detection element (7) arranged on the fixed layer (1) for detecting motion information of the moving layer (2), the detection element (7) being connected to the controller.

7. The dynamic diffuser assembly of claim 6, wherein the fixed layer (1) comprises a base (10) and a flexible circuit board (11) fixed on the base (10), the driving part (3) comprises an energizing coil (31) fixed on the flexible circuit board (11) and a driving magnet (32) fixed on the moving layer (2), the detecting element (7) is located right below the driving magnet (32), a mounting groove (101) is formed on the top wall of the base (10), and the detecting element (7) is located in the mounting groove (101) and fixed on the bottom wall of the flexible circuit board (11).

8. A laser speckle-dispersing apparatus comprising a laser (100), a attenuator assembly (200), a dodging assembly (300), and a scattering member (400) disposed between the attenuator assembly (200) and the dodging assembly (300), characterized in that the scattering member (400) comprises a dynamic diffuser assembly according to any of claims 1-7.

9. A projector comprising the laser despeckle device according to claim 8.

10. A method of controlling a dynamic diffuser assembly, wherein the dynamic diffuser assembly is a dynamic diffuser assembly according to any one of claims 1-7, the method comprising:

controlling the moving layer (2) to move along a first direction and a second direction simultaneously, so that the moving layer (2) moves in a spiral mode relative to the fixed layer (1).