Optical actuator

Abstract

The utility model discloses an optical actuator, which comprises a base, a planar suspension elastic sheet, a magnet, an optical element, a coil and an FPC (Flexible Printed Circuit), the base is provided with a first light through hole, limiting blocks are arranged on the four edges of the surface of the first light through hole, triangular bosses are arranged on the four corners of the surface of the base, the plane suspension elastic piece has the moving, fixing and connecting characteristics and comprises a frame body, buckles and connecting arms, a second light through hole is formed in the center of the frame body, and the L-shaped buckles are arranged on the left side and the right side of the short edge of the frame body. The surface of the frame body is provided with a through hole, the frame body and the buckle are connected through the connecting arm, the connecting arm is used for supporting the optical element, a gap is formed between the optical element and the base in the Z direction, the elastic modulus in the X and Y directions is improved, and the optical element can be kept in the center. The coil is composed of two single coils and installed on a base positioning groove, and magnets are installed on the four sides of the glass and matched with the coil in position.

Description

Technical Field

[0001] The utility model relates to the technical field of optical systems, in particular to an optical actuator. Background Art

[0002] In recent years, with the continuous development of laser display technology, the high coherence characteristics of laser light sources make it easy to produce speckle and background stripes during the projection process. These speckle phenomena seriously reduce the quality of the displayed image and limit the development of laser projection display technology. Therefore, the demand for speckle suppression technology is becoming increasingly urgent. In order to more effectively reduce the laser speckle effect, researchers are constantly exploring new solutions. On the one hand, it is necessary to optimize the design and layout of the diffuser to achieve a more efficient speckle suppression effect; on the other hand, it is necessary to develop new optical devices and projection systems to improve the stability and reliability of the system, reduce system costs, and promote the miniaturization and popularization of laser projection display technology.

[0003] The existing optical device, method for manufacturing an optical device, and method for operating an optical device (TW 202217426A) have the following shortcomings: 1. The manufacturing process of the elastic structure is cumbersome, involving two bending processes, and it is difficult to ensure the accuracy of the bending angle, thereby affecting the overall assembly accuracy of the product and causing poor functionality. 2. The elastic structure needs to be fixed on the two sides of the carrier, which makes assembly more difficult, and the assembly accuracy is also affected by the previous bending angle accuracy. Utility Model Content

[0004] The utility model aims to provide an optical actuator which has a simple structure, is easy to process and assemble, and can effectively dissipate the unevenness in the light spot and improve the imaging quality.

[0005] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0006] An optical actuator, comprising:

[0007] A base, used for fixing and installing various structures;

[0008] The plane suspension shrapnel is installed on the base;

[0009] An optical element is mounted on the planar suspension shrapnel; and

[0010] A coil mounted on the base; and

[0011] a magnet, disposed above the coil and attached to a side end of the optical element; and

[0012] FPC: The FPC is mounted on the base, the FPC is electrically connected to the coil and provides power to the coil.

[0013] Furthermore, the base body is a black metal part, the base is provided with a first light-through hole, the four sides of the surface of the first light-through hole are provided with limit blocks, the four corners of the base surface are provided with triangular bosses, the inner side of the boss and the limit block form a first limit groove, L-shaped positioning bosses are provided on both sides of the short side of the first limit groove, and the L-shaped positioning boss and the triangular boss form a second limit groove.

[0014] Furthermore, the base is also provided with a chamfer and an FPC positioning groove, and two positioning holes are provided along the edge of the chamfer.

[0015] Furthermore, the material of the planar suspension spring is stainless steel.

[0016] Furthermore, the planar suspension spring is composed of a frame body, an L-shaped buckle and a connecting arm. The frame body is provided with a second light-through hole, and L-shaped buckles are provided on the left and right sides of the short side of the frame body, and through holes are provided on the surface thereof, which are connected to the boss of the L-shaped positioning block of the base, and the connecting arm connects the frame body with the L-shaped buckle.

[0017] Furthermore, the coil is installed in a first limiting groove and a second limiting groove of the base.

[0018] Furthermore, the optical element is a device that can transmit or diffusely reflect visible light, and the material can be glass, film or plastic or a composite thereof.

[0019] Furthermore, the magnet and the coil are installed at the same horizontal position and do not contact each other.

[0020] Furthermore, the FPC is fixedly mounted on a positioning groove at the end of the base.

[0021] Beneficial effects of the utility model:

[0022] 1. An optical actuator ensures the stability and imaging quality of the optical system through the precise coordination of the base and the planar suspension shrapnel.

[0023] 2. The optical actuator can be adapted to different application requirements through a variety of driving methods and coil and magnet layouts.

[0024] 3. The design of the flat suspension spring and limit structure processed by one-time bending ensures the reliability and stability of the entire optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 It is a schematic diagram of the base structure in the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the plane suspension shrapnel in the utility model;

[0029] Figure 4 It is a schematic diagram of the coil structure in the utility model.

[0030] In the figure: 1. base; 2. plane suspension spring; 3. coil; 4. optical element; 5. magnet; 6. FPC; 101. first light-through hole; 102. limit block; 103. boss; 104. first limit groove; 105. L-shaped positioning boss; 106. second limit groove; 107. positioning groove; 108. positioning hole; 201. frame body; 2011. second light-through hole; 202. L-shaped buckle; 2021. through hole; 203. connecting arm; 301. inner coil; 302. outer coil. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] like Figure 1-Figure 4 As shown, an optical actuator includes a base 1, a planar suspension spring 2, an optical element 4, a coil 3, a magnet 5 and an FPC 6.

[0033] The base 1 is a black metal part, and the base 1 is provided with a first light hole 101, and the four sides of the surface of the first light hole 101 are provided with limit blocks 102, and the four corners of the surface of the base 1 are provided with triangular bosses 103, and the inner side of the boss 103 and the limit blocks 102 form a first limit groove 104, and the two sides of the short side of the first limit groove 104 are provided with L-shaped positioning bosses 105, and the L-shaped positioning bosses 105 and the triangular bosses 103 form a second limit groove 106. The base 1 is also provided with a chamfer and FPC positioning groove 107, and two positioning holes 108 are provided along the chamfer edge.

[0034] The material of the planar suspension spring 2 is stainless steel, with a thickness of 0.1-0.3 mm, and is formed by etching and bending, with an accuracy of up to ±0.01 mm.

[0035] The plane suspension spring 2 is composed of a frame body 201, an L-shaped buckle 202 and a connecting arm 203. The frame body 201 is provided with a second light-through hole 2011, and L-shaped buckles 202 are provided on the left and right sides of the short side of the frame body 201. The surface of the frame body 201 is provided with a through hole 2021, which is connected to the boss 103 of the L-shaped positioning block of the base 1 and fixed by glue dispensing. The connecting arm 203 connects the frame body 201 with the L-shaped buckle 202. About the function: The design of the connecting arm not only supports the diffuser, but also forms an appropriate gap in the Z direction, thereby significantly improving the elastic modulus in the X and Y directions.

[0036] The coil 3 is a racetrack-shaped device, and is installed in the first limiting groove 104 and the second limiting groove 106 of the base 1, respectively. The two coils are located in the same plane, and the magnet 5 is arranged above the coil 3 and is attached to the optical element 4. The optical element is a device that can transmit or diffusely reflect visible light, and the material can be one of glass, film or plastic or a composite thereof. Specifically, the optical element in this embodiment is a diffuser.

[0037] The magnet 5 and the coil 3 are installed at the same horizontal position and do not contact each other. When the coil 3 is energized, they form a power device with the magnet 5, which can enable the planar suspension spring 2 to drive the diffuser 4 to move along the XY plane.

[0038] The FPC 6 is connected to the coil 5 and provides power, and is attached to the positioning groove 107 at the end of the base 1. FPC is a flexible printed circuit board, which is made of polyimide or polyester film as a substrate and has high reliability and excellent flexibility.

[0039] The light-through holes provided on the base 1 , the planar suspension spring 2 , and the coil 3 match each other, and light passes through the effective area of ​​the diffuser 4 through the light-through holes.

[0040] The magnet 5 is designed to be longer in the long side direction relative to the base 1 than in the short side direction, and the magnet 5 in the long side direction is two different magnetic glued magnet components, and the short side direction is the same magnetic magnet monomer. Regarding the function: it makes the external structure more compact and the light hole can be designed in the center.

[0041] The coil 3, when the currents of the inner coil 301 and the outer coil 302 are in the same direction, the planar suspension spring 2 drives the diffusion sheet 4 to move along the X direction, and when the currents are in opposite directions, it moves along the Y direction, and its working trajectory is +X→+Y→-X→-Y→+X, eventually forming a circular or elliptical path.

[0042] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0043] The plane suspension shrapnel is made of stainless steel and formed by etching and bending, ensuring the accuracy of the structural dimensions and production stability. In addition, such design and processing methods make the shrapnel have appropriate elastic modulus in the X and Y directions, improving the imaging stability of the product; the design of the plane suspension shrapnel connecting arm not only supports the diffuser, but also forms an appropriate gap in the Z direction, so that the diffuser can move more accurately on the XY plane, achieving high-precision positioning and movement; the magnet and the coil are installed at the same horizontal position and do not contact each other, making the entire structure more compact. At the same time, the shape and structure design of the magnet allows the light hole to be designed in the center, further improving the light transmission efficiency; by controlling the direction and size of the current in the coil, the plane suspension shrapnel can be accurately controlled to drive the movement of the diffuser on the XY plane, thereby realizing complex motion trajectories, such as circular or elliptical paths, to meet the needs of various application scenarios.

[0044] Several embodiments of the utility model are described in detail above, but the embodiments of the utility model are not limited thereto and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. An optical actuator, characterized in that: include: A base (1) for fixing and installing various structures; A plane suspension spring (2) is mounted on the base (1); An optical element (4) is mounted on the planar suspension spring (2); and A coil (3) mounted on the base (1); and a magnet (5) disposed above the coil (3) and in contact with a side end of the optical element (4); and An FPC (6), the FPC (6) is mounted on the base (1), the FPC (6) is electrically connected to the coil (3) and provides power to the coil (3); The base (1) is a black metal part. The base (1) is provided with a first light-through hole (101). Limit blocks (102) are provided on four sides of the surface of the first light-through hole (101). Triangular bosses (103) are provided on four corners of the surface of the base (1). The inner side of the boss (103) and the limit blocks (102) form a first limit groove (104). L-shaped positioning bosses (105) are provided on both sides of the short side of the first limit groove (104). The L-shaped positioning bosses (105) and the triangular bosses (103) form a second limit groove (106). The planar suspension spring piece (2) is composed of a frame body (201), an L-shaped buckle (202) and a connecting arm (203); the frame body (201) is provided with a second light-through hole (2011); L-shaped buckles (202) are provided on the left and right sides of the short side of the frame body (201); a through hole (2021) is provided on the surface of the L-shaped buckle, which is connected to the boss (103) of the L-shaped positioning block of the base (1); and the connecting arm (203) connects the frame body (201) and the L-shaped buckle (202).

2. An optical actuator according to claim 1, characterized in that: The base (1) is also provided with a chamfer and an FPC positioning groove (107), and two positioning holes (108) are provided along the edge of the chamfer.

3. An optical actuator according to claim 1, characterized in that: The material of the planar suspension spring (2) is stainless steel.

4. An optical actuator according to claim 1, characterized in that: The coil (3) is installed in a first limiting groove (104) and a second limiting groove (106) of the base (1).

5. The optical actuator according to claim 1, characterized in that: The optical element (4) is a device that can transmit or diffusely reflect visible light.

6. The optical actuator according to claim 1, characterized in that: The magnet (5) and the coil (3) are installed at the same horizontal position and do not contact each other.

7. An optical actuator according to claim 2, characterized in that: The FPC (6) is fixedly mounted on a positioning groove (107) at the end of the base (1).

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