CN214427725U - Dynamic diffusion sheet assembly, laser speckle-dispersing device and projector - Google Patents

Abstract

The dynamic diffusion sheet assembly comprises a fixed layer, a moving layer provided with an optical diffusion sheet and a driving part used for driving the moving layer to move relative to the fixed layer, wherein the driving part comprises an electrified coil fixed on a flexible circuit board of the fixed layer and a driving magnet fixed on the moving layer, and the electrified coil is formed by winding wires on the flexible circuit board. The circular telegram coil can utilize current electric connecting wire to twine and form on the flexible circuit board, can not occupy the ascending height of whole dynamic diffusion piece subassembly Z, and circular telegram coil direct arrangement becomes a part of flexible circuit board in flexible circuit board, can compress whole dynamic diffusion piece subassembly at the ascending size of Z, can also save traditional wire winding, welding, point and fix the equal coil assembly flow.

Description

Dynamic diffusion sheet assembly, 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 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 piece is divided into a static diffusion piece and a dynamic diffusion piece, the existing dynamic diffusion piece is mostly in a rotary type diffusion wheel form, the principle of the diffusion piece is superposition of a plurality of independent speckle patterns in unit time, and under the condition that the rotating speed is fixed, the random phase number of the diffusion piece 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 rotating 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 the rotary type diffusion wheel, the diffusion sheet with the corresponding size cannot provide a corresponding number of random phases, the speckle reduction effect is greatly reduced, and in addition, on the premise of not influencing the speckle reduction effect of the dynamic diffusion sheet, how to compress the occupied space of the whole dynamic diffusion sheet is also a subject of more research in the field of diffusion sheets.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a dynamic diffuser assembly that can solve the problem of space occupation in the Z-direction without affecting the speckle-dispersing effect of the dynamic diffuser.

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.

In order to achieve the above object, the present disclosure provides a dynamic diffusion sheet assembly, including a fixed layer, a movable layer installed with an optical diffusion sheet, and a driving portion for driving the movable layer to move relative to the fixed layer, the driving portion includes an electric coil fixed on a flexible circuit board of the fixed layer and a driving magnet fixed on the movable layer, wherein the electric coil is formed by winding an electric wire on the flexible circuit board.

Optionally, the dynamic diffuser assembly further comprises an intermediate layer between the fixed layer and the moving layer, and the number of the driving parts is two, wherein the first driving part is configured to: driving the moving layer in a first direction relative to the intermediate layer in a plane parallel to the optical diffuser; the second driving part is configured to: the moving layer and the intermediate layer are driven in a second direction relative to the fixed layer in a plane parallel to the optical diffuser.

Optionally, the fixed layer, the movable layer, and the intermediate layer are respectively configured as a square sheet structure, the first driving part and the second driving part are respectively disposed at edges of the square sheet structure, and extending directions of two adjacent edges of the square sheet structure are respectively the first direction and the second direction. Optionally, the first driving portion and the second driving portion are respectively provided in multiple groups, the multiple groups of the first driving portions act synchronously, and the multiple groups of the second driving portions act synchronously.

Optionally, first sliding grooves extending in a first direction are formed in positions corresponding to the bottom wall of the moving layer and the top wall of the intermediate layer, and first balls are mounted in the first sliding grooves; and/or second sliding grooves extending along a second direction are formed in the positions corresponding to the top wall of the fixed layer and the bottom wall of the middle layer respectively, and second balls are mounted in the second sliding grooves.

Optionally, a first mounting groove extending along a first direction and a second mounting groove extending along a second direction are formed on the middle layer, and the moving layer has a first mounting portion capable of being inserted into the first mounting groove and a second mounting portion capable of being inserted into the second mounting groove, wherein the length of the first mounting groove is greater than that of the first mounting portion, and the second mounting portion is matched with the second mounting groove in size, so that when moving along the first direction, the first mounting portion moves in the first mounting groove; when the movable layer moves along the second direction, the second installation part can be abutted to the inner wall of the second installation groove, and the movable layer drives the middle layer to move relative to the fixed layer.

Optionally, the first driving part and the second driving part are both arranged between the moving layer and the middle layer, the two sides of the first installation part and the two sides of the second installation part are respectively provided with the first sliding grooves, the first driving part is fixed on the second installation part, and the second driving part is fixed on the first installation part.

Optionally, the fixed layer includes the base and fixes flexible circuit board on the base, first drive division with second drive division is including fixing circular telegram coil on the flexible circuit board and fixing respectively drive magnet on the removal layer, drive magnet is located directly over the circular telegram coil, the controller with the circular telegram coil is connected. Optionally, the moving layer includes a support, a mounting portion extending vertically downward is formed on a bottom wall of the support, and the driving magnet is fixed on an inner wall of the mounting portion.

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 dynamic diffusion sheet assembly further comprises a metal sheet fixed on the base, and the metal sheet corresponds to the driving magnet in position. 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 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.

According to a second aspect of the present disclosure, there is 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, the scattering member comprising a dynamic diffuser assembly according to the above.

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.

By the technical scheme, the moving layer can be driven to move along different directions by changing the direction of the current in the electrified coil, the flexibility of the movement of a certain point on the optical diffusion sheet in a horizontal plane is increased, different phase divergence angles on the optical diffusion sheet can be fully utilized, the area actually utilized is larger under the condition of the same size, the area utilization rate of the dynamic diffusion sheet is improved, the coherence of laser is better weakened, and a better speckle eliminating effect is provided, the electrified coil can be formed by winding the existing electric connecting line on the flexible circuit board and cannot occupy the upward Z height of the whole dynamic diffusion sheet assembly, the electrified coil is directly arranged in the flexible circuit board and becomes a part of the flexible circuit board, the size of the whole dynamic diffusion sheet assembly in the Z direction can be compressed, and the traditional coil assembling processes of winding, welding, dispensing, fixing and the like can be omitted.

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

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

FIG. 4 is a top view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of a section A-A of the dynamic diffuser assembly of FIG. 4 according to an exemplary embodiment of the present disclosure;

FIG. 6 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. 4;

FIG. 7 is a front view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure

FIG. 8 is a cross-sectional view of section B-B of FIG. 7;

FIG. 9 is a side view of a dynamic diffuser assembly provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 10 is a cross-sectional view of section C-C of FIG. 9;

FIG. 11 is a schematic view of a motion profile of a dynamic diffuser assembly provided in an exemplary embodiment of the present disclosure;

FIG. 12 is a schematic diagram of a motion trajectory of a point on an optical diffuser in a dynamic diffuser assembly provided in an exemplary embodiment of the present disclosure;

FIG. 13 is a schematic structural view of a laser speckle-dissipating apparatus provided in an exemplary embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a laser speckle-eliminating device provided in an exemplary embodiment of the disclosure

Fig. 15 is a flowchart of a method of controlling a dynamic diffuser assembly according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

1-a fixed layer, 10-a base, 101-a fixed groove, 11-a flexible circuit board, 2-a moving layer, 20-a support, 201-a mounting hole, 202-a support, 203-an avoidance groove, 21-a first mounting part, 22-a second mounting part, 23-an optical diffusion sheet, 3-an intermediate layer, 31-a first mounting groove, 32-a second mounting groove, 41-a first driving part, 42-a second driving part, 411-an electrified coil, 412-a driving magnet, 4121-a magnet monomer, 51-a first sliding groove, 52-a second sliding groove, 61-a first ball, 62-a second ball, 7-a metal sheet, 8-a detection element, 100-a laser, 200-a beam shrinking assembly, 300-a light homogenizing assembly, 400-a scattering element, 500-collimating element.

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, when the terms of orientation such as "upper", "lower", "top", "bottom", "left" and "right" are used without any contrary explanation, they are generally defined in the case of normal use of the dynamic diffusion sheet provided in the present disclosure, and particularly, with reference to the drawing directions shown in fig. 5, 6, 8 and 10, "inner" and "outer" refer to inner and outer of the contours of the respective parts. 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 diffusion sheet assembly, as shown in fig. 1, which includes a fixed layer 1, a moving layer 2 on which an optical diffusion sheet 23 is mounted, and a driving part for driving the moving layer 2 to move relative to the fixed layer 1, the driving part including an electrical coil 411 fixed on a flexible circuit board 11 of the fixed layer 1 and a driving magnet 412 fixed on the moving layer 2, wherein the electrical coil 411 is formed by winding an electrical wire on the flexible circuit board 11.

Thus, by changing the direction of the current in the energizing coil 411, the movable layer 2 can be driven to move along different directions, the flexibility of the movement of a certain point on the optical diffusion sheet 23 in a horizontal plane is increased, different phase divergence angles on the optical diffusion sheet 23 can be fully utilized, the actually utilized area is larger under the condition of the same size, the area utilization rate of the dynamic diffusion sheet is improved, the coherence of laser is better weakened, and a better speckle eliminating effect is provided. The circular telegram coil 411 can utilize the existing electric connecting wire on the flexible circuit board 11 to wind and form, can not occupy the ascending height of whole dynamic diffusion piece subassembly Z, and circular telegram coil 411 directly arranges in flexible circuit board 11, becomes a part of flexible circuit board 11, can compress whole dynamic diffusion piece subassembly at the ascending size of Z, can also save traditional wire winding, welding, point and glue coil assembly processes such as fixed.

As shown in fig. 2, the dynamic diffuser assembly provided by the present disclosure further includes an intermediate layer 3 located between the fixed layer 1 and the moving layer 2, two driving portions are provided, namely, a first driving portion 41 and a second driving portion 42, and the first driving portion 41 and the second driving portion 42 are respectively connected to the controller, wherein the first driving portion 41 is configured to: the mobile layer 2 is driven in a first direction with respect to the intermediate layer 3 in a plane parallel to the optical diffuser 23; the second driving portion 42 is configured to: the moving layer 2 and the intermediate layer 3 are driven in a second direction relative to the fixed layer 1 in a plane parallel to the optical diffuser 23.

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 first and second driving portions 41 and 42 may be any suitable driving structure, such as a rack and pinion mechanism, a ball screw mechanism, a linear motor, and the like.

As shown in fig. 11 and 12, the first direction may be an X direction, the second direction may be a Y direction, and the moving layer 2 may move relative to the intermediate layer 3 in the first direction while the moving layer 2 and the intermediate layer 3 as a whole move relative to the fixed layer 1 in the second direction, so that the movement locus of a point on the optical diffusion sheet 23 is a spiral type, whereas the movement locus of a point on the conventional rotary type diffusion sheet is a circle where the point is located, and thus, the movement 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 intermediate layer 3, and then move in the second direction relative to the fixed layer 1 along with the intermediate layer 3, and the movement locus of a certain point on the optical diffusion sheet 23 may be 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 first driving part 41 drives the movable layer 2 to move relative to the middle layer 3 along the first direction, the second driving part 42 drives the movable layer 2 and the middle layer 3 to move relative to the fixed layer 1 along the second direction, so that a certain point on the optical diffusion sheet 23 has two-dimensional motion flexibility in the horizontal plane, compared with the traditional rotary diffusion sheet, the novel optical diffusion sheet has larger coverage area, can fully utilize different phase divergence angles on the optical diffusion sheet 23, has larger area under the condition of the same size, improves the area utilization rate of the dynamic diffusion sheet, better weakens the coherence of laser, and realizes better speckle eliminating effect. In addition, the controller can automatically control the movement amount of the moving layer 3 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, in the present embodiment, as shown in fig. 3, the fixed layer 1, the moving layer 2, and the intermediate layer 3 may be respectively configured as a square sheet structure, the first driving part 41 and the second driving part 42 are respectively arranged at the sides of the square sheet structure, and the extending directions of two adjacent sides of the square sheet structure are respectively a first direction and a second direction. In this way, the first driving portion 41 and the second driving portion 42 are respectively arranged along the corresponding movement directions, so that interference and stopping of the movement of the moving layer 2, the moving layer 2 and the intermediate layer 3 as a whole are avoided, and the fluency of the movement in the two directions can be ensured.

In order to ensure the driving action on the moving layer 2, the first driving portions 41 and the second driving portions 42 may be provided in multiple sets, and the controller controls the first driving portions 41 to operate synchronously and controls the second driving portions 42 to operate synchronously. That is, in the present embodiment, a set of first driving portions 41 is respectively disposed along two opposite sides (along the Y direction) of the square sheet structure, a set of second driving portions 42 is respectively disposed along the other two opposite sides (along the X direction), the controller controls the two sets of first driving portions 41 to synchronously operate, the moving layer 2 is driven to move relative to the intermediate layer 3, the two sets of second driving portions 42 are controlled to synchronously operate, the moving layer 2 is driven to drive the intermediate layer 3 to move relative to the fixed layer 1, and the plurality of sets of driving portions simultaneously operate, so that the driving force for the moving layer 2 can be increased, and the moving layer 2 can move more smoothly along two directions.

Further, in the present disclosure, as shown in fig. 7 to 10, first slide grooves 51 extending in the first direction are formed at positions corresponding to the bottom wall of the moving layer 2 and the top wall of the intermediate layer 3, respectively, and first balls 61 are mounted in the first slide grooves 51; and/or, second sliding grooves 52 extending along the second direction are respectively formed at the corresponding positions of the top wall of the fixed layer 1 and the bottom wall of the middle layer 3, and second balls 62 are installed in the second sliding grooves 52. In the present embodiment, the first slide groove 51 and the second slide groove 52 are perpendicular to each other, and when moving in the first direction, as shown in fig. 8, the first ball 61 is slidably mounted in the first slide groove 51 to guide the movement of the moving layer 2 relative to the intermediate layer 3, and the second ball 62 is stopped in the second slide groove 52, so that the intermediate layer 3 and the fixed layer 1 are fixed and the moving layer 2 moves relative to the intermediate layer 3; in the second direction, as shown in fig. 10, the first balls 61 are stopped in the first sliding grooves 51, and the second balls 62 are slidably mounted in the second sliding grooves 52, so that the fixed layer 1 is fixed and the moving layer 2 can drive the middle layer 3 to move relative to the fixed layer 1.

Remove layer 2, intermediate level 3, fixed layer 1 is supported by first ball 61 and second ball 62 respectively, realizes the displacement flexibility ratio of two directions through the motion of ball in the spout, like this, the whole dynamic diffusion piece of compression that not only can be very big is at the ascending size of Z, can also design through the size to the spout, with the increase at the ascending motion stroke of two directions, and then can design the dynamic diffusion piece of bigger area, reach the utilization of more efficient diffusion area. In other embodiments, a manner that the sliding rail and the sliding block are matched may also be adopted, and the guiding and connecting functions can also be performed, which is not limited by the present disclosure.

In the present disclosure, as shown in fig. 2, a first mounting groove 31 extending along a first direction and a second mounting groove 32 extending along a second direction are respectively formed on the middle layer 3, and the moving layer 2 has a first mounting portion 21 capable of being inserted into the first mounting groove 31 and a second mounting portion 22 capable of being inserted into the second mounting groove 32, wherein the length of the first mounting groove 31 is greater than that of the first mounting portion 21, and the second mounting portion 22 and the second mounting groove 32 are matched in size, so that when moving along the first direction, the first mounting portion 21 moves in the first mounting groove 31, and when the first mounting portion 21 moves to contact with the first mounting groove 31 at the side wall thereof, a limiting effect can be achieved; when moving along the second direction, under the effect of first ball 61 and first spout 51, second installation portion 22 can be inconsistent with the inner wall of second mounting groove 32, and moving layer 2 drives intermediate level 3 and moves for fixed layer 1. By designing the sizes of the first mounting groove 31 and the first mounting part 21, the movement stroke of the moving layer 2 along the first direction can meet the requirement; through designing the size of second mounting groove 32 and second installation department 22 for second installation department 22 just can insert in second mounting groove 32, so that removes layer 2 and can drive the motion of intermediate level 3.

The first driving portion 41 and the second driving portion 42 are both disposed between the moving layer 2 and the middle layer 3, and the first sliding grooves 51 are respectively disposed on the two sides of the first mounting portion 21 and the second mounting portion 22 on the middle layer 3, wherein the first driving portion 41 is fixed on the second mounting portion 22, and the second driving portion 42 is fixed on the first mounting portion 21. First drive division 41 and second drive division 42 are located the coplanar, can save in the ascending occupation space of Z, improve the utilization ratio in space, set up the spout respectively in the both sides of every drive division, can play good guide effect to the motion of removal layer 2, prevent skew and slope, guarantee smooth and easy and stable of course of motion.

The first and second driving portions 41 and 42 may be of any suitable configuration. In the present disclosure, as shown in fig. 3, the fixed layer 1 includes a base 10 and a Flexible Printed Circuit (FPC) 11 fixed on the base 10, the first driving portion 41 and the second driving portion 42 respectively include an energizing coil 411 fixed on the Flexible Circuit 11 and a driving magnet 412 fixed on the moving layer 2, the driving magnet 412 is located right above the energizing coil 411, and the controller is connected to the energizing coil 411. Specifically, taking the arrangement shown in fig. 5 as an example, the current on the left side of the energized coil 411 flows into the paper and the current on the right side flows out of the paper, the direction of the lorentz force applied to the energized coil 411 is left according to the left-hand rule, the direction of the reaction force of the lorentz force applied to the driving magnet 412 is right due to the fixed layer 1 being fixed, the first driving portion 41 drives the moving layer 2 to move right in the X direction, and when the direction of the current in the energized coil 31 is changed, the movement direction is opposite, i.e., left 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 411, the moving layer 2 can be driven to move the optical diffusion sheet 23 in two dimensions. In addition, the driving mode of the energizing coil 411 and the driving magnet 412 is adopted, so that the arrangement is convenient, the arrangement form of the driving part is simplified, and the control is relatively easier.

In this embodiment, the movable layer 2 includes a support 20, a mounting portion extending vertically downward is formed on a bottom wall of the support 20, the driving magnet 412 is fixed on an inner wall of the mounting portion, for example, the driving magnet of the first driving portion 41 may be fixed on an inner wall of the first mounting portion 21 by means of dispensing, the driving magnet of the second driving portion 41 may be fixed on an inner wall of the second mounting portion 22 by means of dispensing, the support 20 may be a plastic bracket, and the driving magnet 412 is nested in the support 20, which also does not occupy more space in the Z direction.

The driving magnet 412 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 412 needs to be embedded in the support 20, the disorder of the spatial layout of the electric connection line can be avoided.

Specifically, as shown in fig. 5, the driving magnet 412 is a bipolar permanent magnet, and the N-pole and S-pole of the bipolar permanent magnet are arranged along the corresponding moving direction; or the drive magnet 412 is a multi-pole permanent magnet, and the N-pole and S-pole of the magnet unit 4121 in the multi-pole permanent magnet are arranged in the direction perpendicular to the movement plane (horizontal plane). The plurality of magnet units 4121 can be assembled together by dispensing, when assembling, the magnetic pole directions of two adjacent magnet units 4121 are opposite, the assembling firmness is further ensured under the action of magnetic force, the driving magnet 412 is designed into a multi-magnetic pole permanent magnet, the magnetic induction line density of a nearby magnetic field can be increased, correspondingly, the Lorentz force for driving the moving layer 2 to move can be increased, and the magnetic diffusion sheet is particularly suitable for a heavier optical diffusion sheet 23 or a structural member moving together with the optical diffusion sheet 23.

In order to realize the fixing and connecting functions of the moving layer 2, the intermediate layer 3, and the fixed layer 1 in the height direction, in an exemplary embodiment of the present disclosure, the dynamic diffusion plate assembly further includes a metal sheet 7 fixed on the base 10, and the positions of the metal sheet 7 and the driving magnet 412 correspond. As shown in fig. 3, a fixing groove 101 is formed on the base 10, the shape of which matches with that of the metal sheet 7, the metal sheet 7 is fixed on the bottom wall of the flexible circuit board 11 by means of dispensing, and the flexible circuit board 11 is fixed on the base 10 by means of dispensing. Through the magnetic force effect between the driving magnet 412 and the metal sheet, the moving layer 2, the middle layer 3 and the fixed layer 1 are tightly buckled together, the balls and the corresponding chutes are always in a contact state, and the whole dynamic diffusion sheet assembly achieves stable ball contact without being influenced by gravity by adopting a pre-magnetization mode in the height direction. In the present embodiment, the width of the metal piece 7 is sufficient to ensure that the magnetic attraction force with the metal piece 7 is only in the Z direction when the driving magnet 412 moves, and no component force is generated in the X direction or the Y direction, thereby avoiding the generation of resistance force opposite to the driving lorentz force.

In another exemplary embodiment of the present disclosure, in the height direction, the moving layer 2 and the intermediate layer 3 may be connected by a plurality of first elastic supporting members disposed at the corners, the intermediate layer 3 and the fixed layer 1 may be connected by a plurality of second elastic supporting members disposed at the corners, and the first elastic supporting members and the second elastic supporting members are made of materials with different deformation degrees, so as to implement the above-described movement manner of the present disclosure. Due to the connection of the elastic support members, it is ensured that the moving layer 2 moves in both the first and second directions. Through the connection mode of the pre-applied magnetic force, the movement of the moving layer 2 in the first direction and the second 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.

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. 3, the support 20 has a mounting hole 201 matching 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, and 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 supporting portion 202 by dispensing, the plurality of avoiding grooves 203 not only facilitate the installation and the taking out of the optical diffusion sheet 23, but also 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. 3, the dynamic diffuser assembly further includes a detection element 8 disposed on the fixed layer 1 for detecting motion information of the moving layer 2, and the detection element 8 is connected to the controller. When the driving magnet 412 is a bipolar permanent magnet, the detecting element 8 may be a Tunnel magnetoresistive sensor (TMR), and when the driving magnet 412 is a multi-pole permanent magnet, the detecting element 8 may be a linear hall sensor, and the position relationship of the driving magnet 412 with respect to the detecting element 8 is determined by the angle change of the induced magnetic field, so as to convert the position information of the driving magnet 412 into an electrical signal and feed back the electrical signal to the controller, and the controller further controls the energizing coil 412 to perform corresponding positive compensation or negative compensation on the driving current of the energizing coil 412, so as to accurately control the motion process of the optical diffusion sheet 23.

According to the second aspect of the present disclosure, as shown in fig. 13, 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. 14, 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. 15, there is also provided a control method of a dynamic diffuser assembly, which may be the dynamic diffuser assembly described above, the control method including: and step 1001, controlling the moving layer 2 to move relative to the intermediate layer 3 along the first direction, controlling the moving layer 2 and the intermediate layer 3 to move relative to the fixed layer 1 along the second direction, and enabling the moving layer 2 to move spirally relative to the fixed layer 1. Thus, the movement locus 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 obtained, the capability of eliminating the laser speckles by the dynamic diffusion sheet can be greatly improved when the laser spots pass through the long and non-repeated movement path, enough random phases can be provided even under the condition of a small diffusion sheet size, and the design that the laser speckles can be eliminated by adopting a small 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 (13)

1. The dynamic diffusion sheet assembly is characterized by comprising a fixed layer (1), a moving layer (2) provided with an optical diffusion sheet (23) and a driving part for driving the moving layer (2) to move relative to the fixed layer (1), wherein the driving part comprises an electrified coil (411) fixed on a flexible circuit board (11) of the fixed layer (1) and a driving magnet (412) fixed on the moving layer (2), and the electrified coil (411) is formed by winding wires on the flexible circuit board (11).

2. The dynamic diffuser assembly of claim 1, further comprising an intermediate layer (3) between the fixed layer (1) and the moving layer (2), the driving portions being two, wherein,

the first drive unit (41) is configured to: -driving the moving layer (2) in a first direction with respect to the intermediate layer (3) in a plane parallel to the optical diffuser (23);

the second drive unit (42) is configured to: -driving the moving layer (2) and the intermediate layer (3) in a second direction with respect to the fixed layer (1) in a plane parallel to the optical diffuser (23).

3. The dynamic diffuser assembly according to claim 2, wherein the fixed layer (1), the moving layer (2), and the intermediate layer (3) are respectively configured as a square sheet structure, the first driving part (41) and the second driving part (42) are respectively disposed at sides of the square sheet structure, and extending directions of two adjacent sides of the square sheet structure are respectively the first direction and the second direction.

4. The dynamic diffuser assembly of claim 3, wherein said first driving portions (41) and said second driving portions (42) are provided in respective sets, wherein said first driving portions (41) of said plurality of sets operate synchronously and said second driving portions (42) of said plurality of sets operate synchronously.

5. The dynamic diffuser assembly of claim 2, wherein the bottom wall of the moving layer (2) and the top wall of the intermediate layer (3) are respectively formed with first slide grooves (51) extending along a first direction, and the first slide grooves (51) are internally provided with first balls (61); and/or the presence of a gas in the gas,

second sliding grooves (52) extending along a second direction are formed in positions corresponding to the top wall of the fixed layer (1) and the bottom wall of the middle layer (3), and second balls (62) are mounted in the second sliding grooves (52).

6. The dynamic diffuser assembly of claim 5, wherein the middle layer (3) is formed with a first mounting groove (31) extending in a first direction and a second mounting groove (32) extending in a second direction, respectively, and the moving layer (2) has a first mounting part (21) insertable into the first mounting groove (31) and a second mounting part (22) insertable into the second mounting groove (32), wherein the first mounting groove (31) has a length greater than that of the first mounting part (21), and the second mounting part (22) is fitted to the second mounting groove (32) in size such that

The first mounting part (21) moves in the first mounting groove (31) when moving in a first direction;

when the movable layer moves along the second direction, the second installation part (22) can be abutted to the inner wall of the second installation groove (32), and the movable layer (2) drives the middle layer (3) to move relative to the fixed layer (1).

7. The dynamic diffuser assembly of claim 6, wherein the first driving part (41) and the second driving part (42) are both disposed between the moving layer (2) and the intermediate layer (3), and the first sliding grooves (51) are respectively disposed on both sides of the first mounting part (21) and both sides of the second mounting part (22) on the intermediate layer (3), wherein the first driving part (41) is fixed on the second mounting part (22) and the second driving part (42) is fixed on the first mounting part (21).

8. The dynamic diffuser assembly of claim 1, wherein the drive magnets (412) are bipolar permanent magnets with their N and S poles arranged in corresponding directions of motion;

or the driving magnet (412) is a multi-magnetic pole permanent magnet, and the N pole and the S pole of the magnet single body (4121) in the multi-magnetic pole permanent magnet are arranged along the direction perpendicular to the motion plane.

9. The dynamic diffuser assembly of claim 1, further comprising a metal plate (7) fixed to the base (10), the metal plate (7) and the drive magnet (412) being positioned in correspondence.

10. The dynamic diffuser assembly of claim 1, wherein said moving layer comprises a support, said support (20) has a mounting hole (201) matching the shape of said optical diffuser (23), a support (202) and a plurality of spaced-apart avoiding grooves (203) are formed on the inner peripheral wall of said mounting hole (201), said optical diffuser (23) is fixed on said support (202), and said plurality of avoiding grooves (203) extend to said support (202).

11. A dynamic diffuser assembly according to claim 1, further comprising a detection element (8) arranged on the fixed layer (1) for detecting motion information of the moving layer (2).

12. 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 1-11.

13. A projector comprising the laser despeckle device according to claim 12.

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