Speckle eliminating device and laser projection equipment

Abstract

The utility model relates to a speckle eliminating device and laser projection equipment, and the speckle eliminating device comprises a stator assembly which comprises a housing and a coil assembly, and the coil assembly is connected to the housing; the mover assembly comprises a support and a magnetic part, the support is connected to the shell through an elastic part, and the magnetic part is arranged on the side, facing the coil assembly, of the support and used for being matched with the electrified coil assembly to generate electromagnetic force; and the optical element is installed on the support, the electromagnetic force generates driving force on the support so as to drive the optical element installed on the support to swing with at least two degrees of freedom, and speckle elimination is carried out on the laser beam passing through the optical element. According to the technical scheme, the technical problems that a traditional speckle eliminating device is large in size and large in operation power consumption are effectively solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a speckle elimination device and a laser projection device. Background Art

[0002] Laser has the characteristics of wide color gamut, high brightness, monochromaticity and good directionality. Laser projection display with laser as light source has the advantages of high brightness, wide color gamut and long life. Due to the high coherence of laser, the image projected by the laser light source will show laser speckle phenomenon on the projection surface. Laser speckle seriously affects the imaging quality of laser projection, causing the color of the picture to be distorted or deteriorated, and it is easy to cause eye fatigue.

[0003] In the related art, the diffuser is usually translated / swung, or driven by a motor to move, so that the laser generates different images at different times, and then the laser speckle seen by the human eye is eliminated by superimposing different images under the effect of the persistence effect of the human eye. However, the above method makes the entire speckle elimination device occupy a large volume and consumes a large amount of operating power. Utility Model Content

[0004] The present application provides a speckle removal device and a laser projection device to solve the technical problems of large size and high operating power consumption of traditional speckle removal devices.

[0005] To this end, in a first aspect, an embodiment of the present application provides a speckle elimination device, comprising:

[0006] The stator assembly includes a housing and a coil assembly, wherein the coil assembly is connected to the housing;

[0007] The mover assembly includes a bracket and a magnetic member, wherein the bracket is connected to the housing through an elastic member, and the magnetic member is arranged on a side of the bracket facing the coil group, and is used to cooperate with the energized coil group to generate electromagnetic force;

[0008] and an optical element, the optical element is mounted on a bracket, the electromagnetic force generates a driving force on the bracket to drive the optical element mounted on the bracket to swing with at least two degrees of freedom, and the laser beam passing through the optical element is despeckled.

[0009] In a possible implementation, a coil group and a magnetic part form an electromagnetic force driving part, and a plurality of electromagnetic force driving parts are provided. The plurality of electromagnetic force driving parts are symmetrically arranged, and a pair of electromagnetic force driving parts arranged opposite to each other are used to form a swing in one degree of freedom.

[0010] In one possible embodiment, the coil group includes a first conductor, a hollow portion and a second conductor, the hollow portion is located between the first conductor and the second conductor, the direction of current in the second conductor is opposite to the direction of current in the first conductor, the magnetic part includes a first magnet corresponding to the first conductor, a non-magnetic area corresponding to the hollow portion and a second magnet corresponding to the second conductor, and the polarity of the first magnet facing the coil group is opposite to the polarity of the second magnet facing the coil group.

[0011] In a possible implementation, the first conductor is located in a magnetic field generated by a first magnet, and the second conductor is located in a magnetic field generated by a second magnet.

[0012] In a possible implementation manner, a mounting window is provided on the housing, and the coil assembly is embedded in the mounting window; and / or

[0013] The bracket is provided with a mounting groove, and the magnetic part is embedded in the mounting groove.

[0014] In a possible implementation, the elastic member includes a first connection portion, an elastic arm, and a second connection portion that are sequentially arranged, the first connection portion is connected to the housing, and the second connection portion is connected to the bracket.

[0015] In a possible implementation, the first connection portion is arranged outside the second connection portion, a plurality of elastic arms are provided, and the plurality of elastic arms are arranged between the first connection portion and the second connection portion at intervals along the circumference of the second connection portion.

[0016] In a possible implementation manner, the stator assembly further includes a spacer column disposed in the accommodating cavity, and the first connecting portion is connected to the housing through the spacer column.

[0017] In a possible implementation, the optical element has a reflective surface, which is located on a side of the optical element away from the elastic member, and the laser beam is projected onto the screen after being reflected by the reflective surface.

[0018] In a possible implementation, the stator assembly further includes a control circuit, the control circuit is disposed outside the shell, and the coil group is electrically connected to the control circuit.

[0019] In a second aspect, the present application further provides a laser projection device, comprising a laser source and the speckle elimination device as described above, wherein the speckle elimination device is used to eliminate speckles of a light beam emitted by the laser source.

[0020] According to the speckle elimination device and laser projection equipment provided in the embodiments of the present application, the speckle elimination device is configured as a combination component including at least a stator assembly, a mover assembly and an optical element. The mover assembly is movably arranged in the housing of the stator assembly through an elastic member. The layout of the entire device is compact, occupies a small space, and has low operating power consumption. In this way, by optimizing the specific structure of the speckle elimination device, the mover assembly can swing in at least two degrees of freedom, thereby driving the optical element connected thereto to swing in at least two degrees of freedom. Specifically, the stator assembly is configured as a combination component including at least a housing and a coil group. At the same time, the mover assembly is configured as a combination component including at least a bracket and a magnetic member. The housing is used to provide an operating space for the coil group, the elastic member and the mover assembly; the magnetic member is used to provide a magnetic field for the coil group. When the coil assembly is in the magnetic field provided by the magnetic part, current is passed through the coil assembly to generate an electromagnetic force perpendicular to the direction of the current and the magnetic part between the magnetic part and the coil assembly. Under the action of the electromagnetic force, the mover assembly has a tendency to escape from the stator assembly; at the same time, under the restraint of the elastic part, the mover assembly has a tendency to return to its original position. In this way, the mover assembly generates at least two degrees of freedom under the dual force of electromagnetic force and elastic force, and drives the optical element to swing synchronously. At this time, when the external laser source is reflected by the swinging optical element to the projection screen, different images generated at different times are superimposed. Under the influence of the persistence effect of the human eye, the image seen has no speckle, the image quality is clear, and the imaging effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0022] Figure 1 An exploded diagram of a speckle elimination device provided in an embodiment of the present application;

[0023] Figure 2 An assembly diagram of a speckle elimination device provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the three-dimensional structure of the electromagnetic force driving part of the speckle elimination device provided in an embodiment of the present application;

[0025] Figure 4 for Figure 3 A cross-sectional view of , wherein the direction of the arrow indicates the direction of the magnetic field;

[0026] Figure 5 for Figure 2 A cross-sectional view of

[0027] Figure 6 for Figure 2 Exploded diagram of

[0028] Figure 7 for Figure 6 A schematic diagram of the structure of the elastic member of the despeckle device;

[0029] Figure 8 for Figure 6 An exploded view of the stator assembly of the despeckle device;

[0030] Fig. 9 for Figure 6 An exploded view of the moving subassembly of the speckle elimination device;

[0031] Fig.10 is a reflection image of the laser source by the speckle elimination device at the first position at the first moment;

[0032] Fig.11 is a reflection image of the laser source by the speckle elimination device at the second position at the second moment;

[0033] Fig.12 is a reflection image of the laser source by the speckle elimination device at a third position at a third moment;

[0034] Fig.13 It is a reflection image of the laser source by the speckle elimination device at the fourth position at the fourth moment.

[0035] Description of reference numerals:

[0036] 100, stator assembly; 110, housing; 111, installation window; 120, coil assembly; 121, first conductor; 122, hollow portion; 123, second conductor; 130, pad column; 140, control circuit;

[0037] 200, mover assembly; 210, bracket; 211, mounting slot; 220, magnetic member; 221, first magnet; 222, non-magnetic area; 223, second magnet;

[0038] 300, optical components;

[0039] 400, elastic member; 410, first connecting portion; 420, elastic arm; 430, second connecting portion;

[0040] 10. Laser source; 20. Speckle elimination device. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0043] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0044] See also Figures 1 to 9 , a speckle elimination device, comprising: a stator assembly 100, a mover assembly 200 and an optical element 300.

[0045] The stator assembly 100 includes a housing 110 and a coil assembly 120 , wherein the coil assembly 120 is connected to the housing 110 ;

[0046] The movable subassembly 200 includes a bracket 210 and a magnetic member 220. The bracket 210 is connected to the housing 110 through an elastic member 400. The magnetic member 220 is disposed on a side of the bracket 210 facing the coil group 120, and is used to cooperate with the energized coil group 120 to generate electromagnetic force.

[0047] And the optical element 300, the optical element 300 is mounted on the bracket 210, the electromagnetic force generates a driving force on the bracket 210 to drive the optical element 300 mounted on the bracket 210 to swing with at least two degrees of freedom, and the laser beam passing through the optical element 300 is despeckled.

[0048] In this embodiment, by optimizing the specific structure of the speckle elimination device 20, the mover assembly 200 can swing in at least two degrees of freedom, thereby driving the optical element 300 connected thereto to swing in at least two degrees of freedom. In this way, when the external laser source 10 is reflected by the swinging optical element 300, different images generated at different times are reflected onto the projection screen, and under the influence of the persistence effect of the human eye, the purpose of eliminating laser speckle is achieved, and the projection effect is improved.

[0049] Specifically, the speckle elimination device 20 is configured as a combination component including at least a stator assembly 100, a mover assembly 200 and an optical element 300. The mover assembly 200 is movably configured in the housing 110 of the stator assembly 100 through an elastic member 400, and the optical element 300 is configured on a bracket 210 of the mover assembly 200. The layout of the entire device is compact, occupies a small space, and has low operating power consumption. Specifically, the stator assembly 100 is configured as a combination component including at least a housing 110 and a coil assembly 120. At the same time, the mover assembly 200 is configured as a combination component including at least a bracket 210 and a magnetic member 220. The housing 110 is used to provide an operating space for the coil assembly 120, the elastic member 400 and the mover assembly 200; the magnetic member 220 is used to provide a magnetic field for the coil assembly 120. When the coil assembly 120 is in the magnetic field provided by the magnetic member 220, current is passed through the coil assembly 120 to generate an electromagnetic force perpendicular to the direction of the current and the magnetic member 220 between the magnetic member 220 and the coil assembly 120, and the mover assembly 200 has a tendency to escape from the stator assembly 100 under the action of the electromagnetic force; at the same time, under the restraint of the elastic member 400, the mover assembly 200 has a tendency to return to its original position, so that the mover assembly 200 generates a regular swing in at least two degrees of freedom under the dual action of the electromagnetic force and the elastic force, and drives the optical element 300 to swing synchronously. At this time, when the external laser source 10 is reflected onto the projection screen by the swinging optical element 300, under the influence of the human eye persistence effect, the image seen by the user has no speckle, the image quality is clear, and the imaging effect is good.

[0050] For example but not limited to, the bracket 210 is made of metal or plastic and has great rigidity to ensure its support strength for the optical element 300 .

[0051] In one example, the housing 110 is a square housing 110 having an opening. The bracket 210 is a square frame bracket 210, which is adapted to the housing cavity of the housing 110. The coil assembly 120 can be arranged on the inner wall of the housing 110 by bonding / screw fixing and other connection methods, and the elastic member 400 can be fixedly arranged on the bottom of the housing cavity by fasteners such as screws / bolts; the magnetic member 220 can be arranged on the outer wall of the bracket 210 by bonding / screw fixing and other connection methods, and the optical element 300 can be fixedly connected to the outer top wall of the bracket 210 by bonding and other methods; the moving subassembly 200 is inserted into the housing cavity from the open end of the housing 110, and the bottom of the bracket 210 can be connected to the elastic member 400 by fasteners such as screws / bolts. When the moving subassembly 200 and the stator assembly 100 are assembled, the magnetic member 220 is arranged opposite to the coil assembly 120, so that the magnetic member 220 can provide a magnetic field to the coil assembly 120. After the coil group 120 is energized with current, an electromagnetic force perpendicular to the direction of the current and the magnet will be generated between the coil group 120 and the magnetic member 220, and the electromagnetic force can make the mover assembly 200 tend to loosen and escape from the housing 110; at this time, the bracket 210 has a tendency to return to its original position under the restraint of the elastic member 400, so that the bracket 210 is in a state of reciprocating swing in the housing 110, and drives the optical element 300 disposed thereon to be in a state of swinging. When the external laser source 10 irradiates the optical element 300, the continuously swinging optical element 300 will cause the external laser source 10 at different times to project different images on the screen, and due to the persistence effect of the human eye, different images are superimposed, and at this time, the speckle of the projected image seen by the human eye is improved, and the clarity is high.

[0052] In one example, the elastic member 400 is disposed on a side of the coil assembly 120 away from the optical element 300 to reduce the influence of the elastic member 400 on the coil assembly 120 and the magnetic member 220 .

[0053] In a possible implementation, a coil assembly 120 and a magnetic member 220 form an electromagnetic force driving unit, and a plurality of electromagnetic force driving units are provided. The plurality of electromagnetic force driving units are symmetrically arranged, and a pair of electromagnetic force driving units arranged opposite to each other are used to form a swing in one degree of freedom.

[0054] In this embodiment, the specific configuration of the speckle elimination device 20 is further optimized. Specifically, multiple sets of coil groups 120 are configured on the housing 110, and multiple sets of magnetic members 220 are configured on the bracket 210. An electromagnetic force driving unit forms an electromagnetic force that drives the movable subassembly 200 to separate from the housing 110. A pair of electromagnetic force driving units arranged opposite to each other are used to realize the swing of the movable subassembly 200 in one degree of freedom. Multiple electromagnetic force driving units can form swings in multiple degrees of freedom, thereby realizing the swing of multiple degrees of freedom of the optical element 300 and improving the reflective speckle elimination effect of the optical element 300.

[0055] In one example, the number of electromagnetic force driving units can be determined according to the planar shape of the optical element 300. For example, when the optical element 300 is rectangular, four electromagnetic force driving units can be configured to achieve the swing of the optical element 300 in two degrees of freedom; when the optical element 300 is circular or polygonal, six or eight electromagnetic force driving units can be configured to achieve the swing of the optical element 300 in three or four degrees of freedom, and so on. For example but not limited to, the optical element 300 is square, in which case, four electromagnetic force driving units are provided, that is, four coil groups 120 and four magnetic members 220 are provided, and the four coil groups 120 are respectively provided on the four sides of the housing 110, and the four magnetic members 220 are respectively provided on the four sides of the bracket 210.

[0056] In a possible embodiment, the coil group 120 includes a first conductor 121, a hollow portion 122 and a second conductor 123, the hollow portion 122 is located between the first conductor 121 and the second conductor 123, the current direction in the second conductor 123 is opposite to the current direction in the first conductor 121, and the magnetic member 220 includes a first magnet 221 corresponding to the first conductor 121, a non-magnetic area 222 corresponding to the hollow portion 122 and a second magnet 223 corresponding to the second conductor 123, and the polarity of the first magnet 221 facing the coil group 120 is opposite to the polarity of the second magnet 223 facing the coil group 120.

[0057] In this embodiment, the specific configuration of the coil group 120 and the magnetic member 220 is optimized. Specifically, the coil group 120 is configured as a composite component including at least a first conductor 121, a hollow portion 122, and a second conductor 123. The first conductor 121 and the second conductor 123 are connected end to end to form a hollow O-shaped coil, and the current flowing through them is in opposite directions; at the same time, the magnetic member 220 is configured as a composite component including at least a first magnet 221, a non-magnetic region 222, and a second magnet 223. The first magnet 221 and the second magnet 223 constitute a bipolar magnet, and the polarities of the magnetic regions on the same side are opposite. For example, the side of the first magnet 221 facing the coil group 120 is the S pole, and the side of the second magnet 223 facing the coil group 120 is the N pole. The magnetic member 220 is arranged opposite to the coil group 120. When the coil group 120 is energized, an electromagnetic force perpendicular to the current direction and the magnetic field direction generated by the bipolar magnet is generated between the magnetic member 220 and the coil group 120, and the electromagnetic force can drive the mover assembly 200 to swing.

[0058] In one example, the coil assembly 120 is horizontally placed on the housing 110, and the first conductor 121 is located above the second conductor 123; the magnetic member 220 is horizontally arranged on the bracket 210, and the first magnet 221 is located above the second magnet 223. Figure 3 , Figure 4 and Figure 6 , the electromagnetic force driving part on the left side of the moving subassembly 200 is subjected to force analysis. Figure 4 When the current in the second conductor 123 flows inward, according to the left-hand Ampere's rule, the first magnet 221 is subjected to an upward electromagnetic force; at this time, the current direction in the second conductor 123 is perpendicular to the Figure 4 Outward, the second magnet 223 is subjected to an upward electromagnetic force. It can be seen that the left side of the movable subassembly 200 as a whole is subjected to an upward electromagnetic force. At the same time, the electromagnetic force driving part on the right side of the movable subassembly 200 is subjected to a force analysis. The first magnet 221 and the second magnet 223 are both subjected to a downward electromagnetic force, and the right side of the movable subassembly 200 as a whole is subjected to a downward electromagnetic force. In this way, the left and right sides of the movable subassembly 200 can achieve a swing with one degree of freedom. Similarly, combined with Figure 3 and Figure 6, the electromagnetic force driving part on the front side of the moving subassembly 200 is subjected to force analysis. When a horizontal leftward current is passed into the first conductor 121, according to the left-hand Ampere rule, the first magnet 221 is subjected to an upward electromagnetic force; at this time, the current direction in the second conductor 123 is horizontal to the right, and the second magnet 223 is subjected to an upward electromagnetic force. It can be seen that the front side of the moving subassembly 200 is subjected to an upward electromagnetic force as a whole. At the same time, the electromagnetic force driving part on the rear side of the moving subassembly 200 is subjected to a force downward, and the rear side of the moving subassembly 200 is subjected to an electromagnetic force pressing downward as a whole. In this way, the front and rear sides of the moving subassembly 200 can achieve swinging in another degree of freedom. When it is necessary to change the swinging direction of the left and right sides of the moving subassembly 200, just change the direction of the current passed into the coil group 120.

[0059] In a possible implementation, the first conductor 121 is located in the magnetic field generated by the first magnet 221 , and the second conductor 123 is located in the magnetic field generated by the second magnet 223 .

[0060] In this embodiment, the positional relationship between the coil assembly 120 and the magnetic member 220 is optimized. Specifically, the first conductor 121 is arranged in the stable magnetic field generated by the first magnet 221, and the second conductor 123 is arranged in the stable magnetic field generated by the second magnet 223, so as to improve the stability of the electromagnetic force generated by the electromagnetic force driving unit, thereby improving the swing stability of the mover assembly 200, improving the swing stability of the optical element 300, and improving the despeckle effect.

[0061] In one example, the wider surface of the first magnet 221 is arranged opposite to the wider surface of the first conductor 121, and the wider surface of the second magnet 223 is arranged opposite to the wider surface of the second conductor 123, so as to increase the magnetic field contact area between the coil group 120 and the magnetic part 220 and increase the magnetic field force.

[0062] In a possible implementation, the housing 110 is provided with an installation window 111 , and the coil assembly 120 is embedded in the installation window 111 ; and / or the bracket 210 is provided with an installation groove 211 , and the magnetic member 220 is embedded in the installation groove 211 .

[0063] In this embodiment, the connection method between the housing 110 and the coil group 120 is optimized. Specifically, in order to further reduce the occupied space of the stator assembly 100, a through installation window 111 is arranged on the side wall of the housing 110, and the size of the installation window 111 is adapted to the size of the coil group 120. In this way, the radial thickness of the housing 110 can be fully utilized, and the coil group 120 can be embedded in the installation window 111, so that the coil group 120 is hidden in the side wall of the housing 110 to reduce the radial occupied space of the stator assembly 100; at the same time, embedding the coil group 120 in the side wall of the housing 110 can also avoid the impact / collision of the moving rotor assembly 200 on the coil group 120, thereby improving the reliability of the stator assembly 100; in addition, the embedded connection method can also make the distance between the magnetic member 220 and the coil group 120 closer, so as to achieve the maximum electromagnetic conversion efficiency of the despeckle device 20.

[0064] In one example, the connection method between the bracket 210 and the magnetic member 220 is optimized. Specifically, in order to further reduce the occupied space of the moving subassembly 200, a mounting groove 211 is opened on the outer wall of the bracket 210, and the size of the mounting groove 211 is adapted to the size of the magnetic member 220. In this way, the radial thickness of the bracket 210 can be fully utilized, and the magnetic member 220 is embedded in the mounting groove 211, so that the magnetic member 220 is hidden in the side wall of the bracket 210 to reduce the radial occupied space of the moving subassembly 200; at the same time, the magnetic member 220 is embedded in the side wall of the bracket 210, which can also avoid the impact / collision of the inner wall of the coil group 120 / housing 110 during movement, thereby improving the reliability of the moving subassembly 200; in addition, the embedded connection method can also make the distance between the magnetic member 220 and the coil group 120 closer, so as to achieve the maximum electromagnetic conversion efficiency of the despeckle device 20.

[0065] In a possible implementation, the elastic member 400 includes a first connection portion 410 , an elastic arm 420 , and a second connection portion 430 that are sequentially arranged. The first connection portion 410 is connected to the housing 110 , and the second connection portion 430 is connected to the bracket 210 .

[0066] In this embodiment, the specific configuration of the elastic member 400 is optimized. Specifically, the elastic member 400 is configured as a composite member including at least a first connection portion 410, an elastic arm 420, and a second connection portion 430, wherein the first connection portion 410 is used to be rigidly connected to the housing 110, the elastic arm 420 is used to provide a restoring force to the mover assembly 200, and the second connection portion 430 is used to be rigidly connected to the bracket 210, so as to realize the elastic connection between the mover assembly 200 and the stator assembly 100.

[0067] For example, but not limited to, the second connection part 430, the elastic arm 420 and the first connection part 410 are sequentially connected from the inside to the outside, so that the speckle removal device 20 can swing around its center. The elastic member 400 can be a spring, and its material can be metal, stainless steel or copper alloy.

[0068] In a possible implementation, the first connection portion 410 is disposed outside the second connection portion 430 , a plurality of elastic arms 420 are provided, and the plurality of elastic arms 420 are disposed between the first connection portion 410 and the second connection portion 430 at intervals along the circumference of the second connection portion 430 .

[0069] In this embodiment, the specific configuration of the elastic member 400 is further optimized. Specifically, the first connection portion 410 is configured as an annular structure, which is arranged at intervals around the periphery of the second connection portion 430. The two ends of the elastic arm 420 are respectively connected between the first connection portion 410 and the second connection portion 430, and the multiple elastic arms 420 are arranged at intervals along the inner circumferential direction of the first connection portion 410, so that the elastic member 400 can provide a uniform and stable elastic restoring force to the mover assembly 200.

[0070] In one example, the elastic member 400 may be a square spring sheet, the first connecting portion 410 may be a square ring sheet structure, the second connecting portion 430 may be a square sheet structure, and four elastic arms 420 may be provided, and the four elastic arms 420 may be respectively connected to the four sides of the first connecting portion 410 and the four sides of the second connecting portion 430 at positions opposite to each other. In this case, the optical element 300 may be a square lens, and the four sides of the optical element 300 may be respectively parallel to the four sides of the elastic member 400; two groups of electromagnetic force driving parts may be provided, and the two groups of electromagnetic force driving parts may be respectively provided in the directions corresponding to the four sides of the elastic member 400. In this way, the swing of the optical element 300 in two degrees of freedom, left and right or front and back, may be realized.

[0071] In a possible implementation, the stator assembly 100 further includes a spacer column 130 disposed in the accommodating cavity, and the first connecting portion 410 is connected to the housing 110 via the spacer column 130 .

[0072] In this embodiment, the specific configuration of the stator assembly 100 is further optimized. Specifically, the stator assembly 100 is configured as a composite component including at least a housing 110, a coil assembly 120 and a pad column 130, and the pad column 130 is arranged at the bottom of the housing 110 and extends toward the open end of the housing 110. The elastic member 400 can be connected to the top of the pad column 130 by fasteners such as screws / bolts. The pad column 130 is used to provide the elastic member 400 with an elastic space in the assembly direction of the movable assembly 200 and the stator assembly 100. When the movable assembly 200 is pulled back to its original position by the elastic member 400, it can be buffered to prevent the elastic member 400 from directly hitting the bottom of the housing 110 to cause mechanical damage / damage to the stator assembly 100, thereby affecting the stability of the stator assembly 100.

[0073] In one example, in order to improve the connection stability and force uniformity between the elastic member 400 and the housing 110, a plurality of pads 130 are provided. For example, but not limited to, four pads 130 are provided, and the four pads 130 are respectively provided at the four corners of the accommodating cavity. At this time, the four corners of the first connecting portion 410 are provided with connection holes, and the fasteners of screws / bolts pass through the connection holes and the fixing holes on the pads 130 in sequence to achieve the connection and fastening of the elastic member 400 and the pads 130.

[0074] In a possible implementation, the optical element 300 has a reflective surface, and the reflective surface is located on a side of the optical element 300 away from the elastic member 400 . The laser beam is reflected by the reflective surface and then projected onto the screen.

[0075] In this embodiment, the optical element 300 is configured as a plane reflector, which has a reflective surface, so as to realize the superposition of reflected projections at different times by swinging the reflective surface, thereby eliminating speckles of the laser beam. In this way, when the laser beam is irradiated on the reflective surface, it is directly reflected onto the screen, and the light loss is small; and, precisely because of the reflective projection with low light loss in this embodiment, it has small requirements on the vibration amplitude and vibration space of the speckle elimination device 20, which is conducive to the miniaturization and sophisticated layout of the speckle elimination device 20.

[0076] In a possible implementation, the stator assembly 100 further includes a control circuit 140 . The control circuit 140 is disposed outside the housing 110 , and the coil assembly 120 is electrically connected to the control circuit 140 .

[0077] In this embodiment, the specific configuration of the stator assembly 100 is further optimized. Specifically, the stator assembly 100 is configured as a composite component including at least a housing 110, a coil assembly 120, and a control circuit 140. The control circuit 140 may be a flexible printed circuit (FPC), which is configured on the outside of the housing 110. The wires of the coil assembly 120 are connected to the control circuit 140 to form a current loop. When the coil assembly 120 needs to be energized, the current loop is turned on.

[0078] In one example, the control circuit 140 is a square frame structure with two open ends, which is sleeved around the side wall of the housing 110 and is electrically connected to the coil assembly 120 disposed on the side wall of the housing 110 .

[0079] In addition, the present application also provides a laser projection device, including a laser source 10 and the speckle elimination device 20 as described above, the speckle elimination device 20 is used to eliminate speckles of the light beam emitted by the laser source 10. The specific structure of the speckle elimination device 20 refers to the above embodiment. Since the laser projection device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0080] In this embodiment, in order to eliminate the speckle phenomenon of the laser projection device, the laser projection device is configured as a combined component including at least a laser source 10 and a speckle elimination device 20. The light emitted by the laser source 10 is reflected by the speckle elimination device 20 and then projected onto the screen to form an image. Since the optical element 300 of the speckle elimination device 20 is in a swinging state during operation, the positions of the images projected on the screen by the laser source 10 at different times are different. In addition, due to the persistence effect of the human eye, the images at different positions are superimposed, so that the projected image seen by the human eye on the screen does not have the speckle phenomenon and the image is clear. For details, see Figures 10 to 13 .

[0081] in, Fig.10 is a reflection image of the laser source 10 by the speckle elimination device 20 at the first position at the first moment; Fig.11 At the second moment, the speckle elimination device 20 performs a secondary superposition of the reflection image of the laser source 10 at the second position; Fig.12 At the third moment, the reflected image of the laser source 10 by the speckle elimination device 20 at the third position is superimposed three times; Fig.13 At the fourth moment, the speckle elimination device 20 superimposes the reflected image of the laser source 10 four times at the fourth position. It can be seen that the image on the screen changes from the speckle state to the non-speckle state, the speckle on the projected image is eliminated, and the image clarity is high.

[0082] Among them, the laser source 10 is used to emit a laser beam, which has the characteristics of high brightness, good monochromaticity, small luminous angle, and high coherence. The high coherence of the laser will cause the speckle effect in the laser projection display. The speckle effect refers to that when a coherent light source is irradiated on an optically rough surface such as a wall, paper, frosted glass, etc., whose average fluctuation is greater than the order of magnitude of the laser wavelength, the scattered light will interfere in space due to the constant phase difference, the same light wave frequency, and the same vibration direction. Some parts interfere constructively, and some parts interfere destructively. It has a random spatial light intensity distribution and presents a granular structure. The final result is the appearance of light and dark spots on the screen, that is, speckle. These unfocused spots appear to be flickering in the human eye, which can easily cause discomfort when viewed for a long time, and more seriously affect the quality of the projected image, reducing the user's viewing experience.

[0083] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0084] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0085] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A speckle elimination device, characterized in that: include: A stator assembly comprises a housing and a coil assembly, wherein the coil assembly is connected to the housing; A mover assembly, comprising a bracket and a magnetic member, wherein the bracket is connected to the housing through an elastic member, and the magnetic member is arranged on a side of the bracket facing the coil group, and is used to cooperate with the energized coil group to generate electromagnetic force; and an optical element, wherein the optical element is mounted on the bracket, and the electromagnetic force generates a driving force on the bracket to drive the optical element mounted on the bracket to swing with at least two degrees of freedom, thereby despeckle the laser beam passing through the optical element.

2. The speckle reduction device according to claim 1, characterized in that: One coil group and one magnetic part form an electromagnetic force driving part. There are multiple electromagnetic force driving parts. The multiple electromagnetic force driving parts are symmetrically arranged. A pair of electromagnetic force driving parts arranged opposite to each other are used to form a swing in one degree of freedom.

3. The speckle reduction device according to claim 1, characterized in that: The coil group includes a first conductor, a hollow portion and a second conductor, the hollow portion is located between the first conductor and the second conductor, the current direction in the second conductor is opposite to the current direction in the first conductor, the magnetic part includes a first magnet corresponding to the first conductor, a non-magnetic area corresponding to the hollow portion and a second magnet corresponding to the second conductor, and the polarity of the first magnet facing the coil group is opposite to the polarity of the second magnet facing the coil group.

4. The speckle reduction device according to claim 3, characterized in that: The first conductor is located in the magnetic field generated by the first magnet, and the second conductor is located in the magnetic field generated by the second magnet.

5. The speckle reduction device according to claim 1, characterized in that: The housing is provided with an installation window, and the coil assembly is embedded in the installation window; and / or The bracket is provided with a mounting groove, and the magnetic component is embedded in the mounting groove.

6. The speckle reduction device according to claim 1, characterized in that: The elastic member includes a first connecting portion, an elastic arm and a second connecting portion which are arranged in sequence, the first connecting portion is connected to the shell, and the second connecting portion is connected to the bracket.

7. The speckle reduction device according to claim 6, characterized in that: The first connection part is arranged outside the second connection part in an annular manner. A plurality of elastic arms are provided. The plurality of elastic arms are arranged between the first connection part and the second connection part at intervals along the circumferential direction of the second connection part.

8. The speckle reduction device according to claim 7, characterized in that: The stator assembly further includes a spacer column disposed in the accommodating cavity of the housing, and the first connecting portion is connected to the housing through the spacer column.

9. The speckle reduction device according to claim 1, characterized in that: The optical element has a reflecting surface, and the reflecting surface is located at a side of the optical element away from the elastic member. The laser beam is reflected by the reflecting surface and then projected onto the screen.

10. The speckle reduction device according to claim 1, characterized in that: The stator assembly further includes a control circuit, which is disposed outside the housing, and the coil group is electrically connected to the control circuit.

11. A laser projection device, characterized in that: The invention comprises a laser source and a speckle elimination device as claimed in any one of claims 1 to 10, wherein the speckle elimination device is used for eliminating speckles of a light beam emitted by the laser source.

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