Precise light and thin optical actuator

Abstract

The utility model relates to the technical field of projection systems, in particular to a precise light and thin optical actuator, which comprises a base, a coil, a planar suspension elastic sheet and a circuit board, a first light through hole is arranged on the base, a positioning groove is arranged on the side edge of the first light through hole, and the coil is arranged at the positioning groove; a second light passing opening is formed in the coil, optical glass is arranged in the second light passing opening, a magnet is arranged on the outer side wall of the optical glass, and a plane suspension elastic piece is arranged at the top of the optical glass; a chamfering boss is arranged on the base, a positioning column is arranged on the chamfering boss, a positioning hole is formed in the plane suspension elastic piece, and the positioning column is matched with the positioning hole; the circuit board is connected with the coil and provides power. According to the utility model, rapid and accurate deflection movement of optical glass on virtual X and Y axes is realized. The flexibility and the response speed of the optical system are improved, the size and the weight of the whole device are reduced, and the optical system is more suitable for application scenes with strict space requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of projection systems, in particular to a precise, light and thin optical actuator. Background Art

[0002] An optical actuator is a device that converts light energy or other forms of energy into mechanical displacement or force. It uses the deformation or response of optical materials under specific conditions to control mechanical systems.

[0003] Chinese patent CN216772175U discloses a dual-axis optical actuator, including at least two positioning protrusions arranged on a base, a circuit board and a substrate overlapped and matched with the positioning protrusions through through holes, and an optical galvanometer fixing member arranged on the other side of the circuit board and spaced relatively from the circuit board. In the optical actuator assembly, at least two magnetic suction members are combined with coils electrically connected to the circuit board, each coil is wound around the outer wall of a positioning protrusion, and the minimum geometric dimension of the coil is arranged along the thickness direction. This design reduces the overall thickness of the optical actuator, making it possible to miniaturize and increase the precision of the projection equipment.

[0004] However, this patent still has the following problems: since the coil is tightly arranged between the optical galvanometer fixture and the circuit board, and the minimum geometric dimension design along the thickness direction limits the heat dissipation area, the coil temperature may rise after long-term operation, affecting the performance and stability of the optical actuator. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a precision, light and thin optical actuator, which solves the problems of the existing optical actuators, such as the large number of parts, low positioning accuracy, high power consumption, unbalanced driving force and poor stability.

[0006] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a precision, lightweight and thin optical actuator is proposed, comprising a base, a coil, a planar suspension spring and a circuit board, the base being provided with a first light-through hole, a side of the first light-through hole being provided with a positioning groove, and the coil being provided at the positioning groove; a second light-through opening being provided in the coil, an optical glass being provided in the second light-through opening, a magnet being provided on the outer wall of the optical glass, and the planar suspension spring being provided on the top of the optical glass; a chamfered boss being provided on the base, a positioning column being provided on the chamfered boss, a positioning hole being provided on the planar suspension spring, and the positioning column being adapted to the positioning hole; the circuit board is connected to the coil and provides power.

[0007] As a further solution of the utility model: the coil is composed of two layers of upper and lower monomer coils, and the magnet is composed of two layers of upper and lower monomer magnets, the upper and lower layers of monomer coils correspond to the installation positions of the upper and lower layers of monomer magnets, the upper layer of monomer coils is controlled to rotate along the Y axis, and the lower layer of monomer coils is controlled to rotate along the X axis, and a runway-shaped inner ring is arranged in the middle of the coil, and the runway-shaped inner ring is adapted to the positioning groove.

[0008] As a further solution of the utility model: the planar suspension spring sheet includes a frame body, a third light-through hole is arranged in the middle of the frame body, and the positioning holes are arranged at the four corners of the frame body; the frame body is connected to an elastic unit, and the elastic unit includes a cantilever and a connecting arm. The positioning hole is arranged on the cantilever, and the connecting arms are connected to each other, and the frame body is connected to the cantilever at the same time.

[0009] As a further solution of the utility model: a mounting surface is arranged at the end of the base, and the circuit board is arranged on the mounting surface.

[0010] As a further solution of the utility model: a mounting hole is provided on the mounting surface, and the mounting hole is used for mounting on the optical machine.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model realizes the fast and precise deflection movement of the optical glass on the virtual X and Y axes through the synergistic effect of the base, the plane suspension shrapnel, the optical glass, the magnet and the coil. This design not only improves the flexibility and response speed of the optical system, but also significantly reduces the volume and weight of the overall device, making it more suitable for application scenarios with strict space requirements.

[0013] 2. The utility model ensures the accuracy of installation by matching the runway-shaped inner ring with the base positioning groove. The coil and the magnet are installed at the same horizontal position and do not touch each other, avoiding potential interference. At the same time, the coil is divided into two layers of upper and lower single coils, which improves the utilization rate of the coil and increases the torque. At the same time, by designing the magnet to correspond to the coil position, the efficient operation of the magnetic device is ensured. The upper and lower two single magnets correspond to the two single coils, which further improves the torque and ensures the balance of the opposite sides of the torque.

[0014] 3. The utility model effectively avoids the direct influence of heat on the circuit board by setting the mounting surface, thereby ensuring the stability and durability of the circuit board connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a precision, lightweight optical actuator.

[0016] Figure 2A schematic diagram of the structure of the base.

[0017] Figure 3 Schematic diagram of the coil structure.

[0018] Figure 4 Schematic diagram of a plane suspension shrapnel.

[0019] Reference numerals in the figure: 1. base; 11. first light-through hole; 12. positioning groove; 13. chamfered boss; 14. positioning column; 2. coil; 21. second light-through opening; 22. racetrack-shaped inner ring; 3. optical glass; 4. magnet; 5. plane suspension spring; 51. frame body; 52. third light-through hole; 53. cantilever; 54. connecting arm; 55. positioning hole; 6. circuit board; 7. mounting surface; 71. mounting hole. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. 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.

[0021] like Figures 1 to 4 As shown, a precision light and thin optical actuator includes a base 1, a coil 2, a planar suspension spring 5 and a circuit board 6. The base 1 is provided with a first light hole 11, a side of the first light hole 11 is provided with a positioning groove 12, and the coil 2 is arranged at the positioning groove 12; a second light opening 21 is provided in the coil 2, an optical glass 3 is provided in the second light opening 21, and a magnet 4 is provided on the outer side wall of the optical glass 3;

[0022] The planar suspension shrapnel 5 is arranged on the top of the optical glass 3 ; the planar suspension shrapnel 5 is made of stainless steel with a thickness of 0.08 mm and is formed by etching with an accuracy of ±0.01 mm. The optical glass 3 is installed in the etching groove of the planar suspension shrapnel 5 .

[0023] The base 1 is provided with a chamfered boss 13, the chamfered boss 13 is provided with a positioning column 14, the planar suspension spring 5 is provided with a positioning hole 55, the positioning column 14 is adapted to the positioning hole 55; fixed by glue dispensing; the circuit board 6 is connected to the coil 2 and provides power.

[0024] Through the coordinated action of the base 1, the plane suspension shrapnel 5, the optical glass 3, the magnet 4 and the coil 2, the optical glass 3 is quickly and accurately deflected on the virtual X and Y axes. This design not only improves the flexibility and response speed of the optical system, but also significantly reduces the volume and weight of the overall device, making it more suitable for application scenarios with strict space requirements;

[0025] The coil 2 is composed of two layers of upper and lower monomer coils 2, and the magnet 4 is composed of two layers of upper and lower monomer magnets 4. The upper and lower layers of monomer coils 2 correspond to the installation positions of the upper and lower layers of monomer magnets 4. The upper layer of monomer coils 2 is controlled to rotate along the Y axis, and the lower layer of monomer coils 2 is controlled to rotate along the X axis. A racetrack-shaped inner ring 22 is arranged in the middle of the coil 2, and the racetrack-shaped inner ring 22 is adapted to the positioning groove 12. The magnet 4 and the coil 2 are installed at the same horizontal position and do not contact each other. When the coil 2 is energized, it forms a magnetic device with the magnet 4.

[0026] The accuracy of installation is ensured by matching the runway-shaped inner ring 22 with the positioning groove 12 of the base 1. The coil 2 and the magnet 4 are installed at the same horizontal position and do not touch each other, avoiding potential interference. At the same time, the coil 2 is divided into two layers of upper and lower single coils 2, which improves the utilization rate of the coil 2 and increases the torque. At the same time, by designing the position of the magnet to correspond to the position of the coil 2, the efficient operation of the magnetic device is ensured. The upper and lower two single magnets 4 correspond to the two single coils 2, which further improves the torque and ensures the balance of the opposite sides of the torque.

[0027] The plane suspension spring piece 5 includes a frame body 51, a third light hole 52 is arranged in the middle of the frame body 51, and positioning holes 55 are arranged at the four corners of the frame body 51; the frame body 51 is externally connected with an elastic unit, and the elastic unit includes a cantilever 53 and a connecting arm 54, the positioning hole 55 is arranged on the cantilever 53, and the connecting arms 54 are connected to each other, and the frame body 51 is connected to the cantilever 53. The first light hole 11, the second light hole 21 and the third light hole 52 match each other.

[0028] A mounting surface 7 is disposed at the end of the base 1 , and the circuit board 6 is disposed on the mounting surface 7 .

[0029] Since the heat generated by the coil 2 during operation will be transferred to the surface of the base 1 , the installation surface 7 is provided to effectively avoid the direct influence of the heat on the circuit board 6 , thereby ensuring the stability and durability of the connection of the circuit board 6 .

[0030] The mounting surface 7 is provided with a mounting hole 71 , and the mounting hole 71 is used for mounting on an optical machine.

[0031] The working principle of the utility model: when the current flows to the coil 2 through the pad of the circuit board 6, a magnetic field is generated inside the coil 2. According to Ampere's law, when the current flows in the wire, a magnetic field will be generated around it. Since the coil 2 is divided into two layers, each layer of the coil 2 controls a different axis. The upper layer controls the Y axis, and the lower layer controls the X axis. When the upper layer of the single coil 2 is energized, the generated Lorentz force will cause the planar suspension shrapnel 5 and the optical glass 3 thereon to deflect around the virtual Y axis; similarly, when the lower layer of the single coil 2 is energized, the planar suspension shrapnel 5 will deflect around the virtual X axis. Since the upper and lower layers of the single coil 2 correspond to the upper and lower layers of the single magnets 4, the generated torsion is balanced on the opposite sides, which increases the effect of the Ampere force and reduces product loss.

[0032] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A precision, light and thin optical actuator, comprising a base (1), a coil (2), a planar suspension spring (5) and a circuit board (6), characterized in that: The base (1) is provided with a first light-through hole (11), a positioning groove (12) is provided on the side of the first light-through hole (11), and the coil (2) is arranged at the positioning groove (12); a second light-through opening (21) is provided in the coil (2), an optical glass (3) is provided in the second light-through opening (21), a magnet (4) is provided on the outer wall of the optical glass (3), and the planar suspension spring (5) is provided on the top of the optical glass (3); The base (1) is provided with a chamfered boss (13), the chamfered boss (13) is provided with a positioning column (14), the planar suspension spring sheet (5) is provided with a positioning hole (55), and the positioning column (14) is adapted to the positioning hole (55); The circuit board (6) is connected to the coil (2) and provides power.

2. A precision, light and thin optical actuator according to claim 1, characterized in that: The coil (2) is composed of two layers of upper and lower monomer coils (2), and the magnet (4) is composed of two layers of upper and lower monomer magnets (4). The upper and lower layers of monomer coils (2) correspond to the installation positions of the upper and lower layers of monomer magnets (4). The upper layer of monomer coils (2) is controlled to rotate along the Y axis, and the lower layer of monomer coils (2) is controlled to rotate along the X axis. A racetrack-shaped inner ring (22) is arranged in the middle of the coil (2), and the racetrack-shaped inner ring (22) is adapted to the positioning groove (12).

3. The precision, light and thin optical actuator according to claim 1, characterized in that: The planar suspension spring sheet (5) comprises a frame body (51), a third light-through hole (52) is arranged in the middle of the frame body (51), and positioning holes (55) are arranged at the four corners of the frame body (51); the frame body (51) is externally connected to an elastic unit, and the elastic unit comprises a cantilever (53) and a connecting arm (54), the positioning hole (55) is arranged on the cantilever (53), and the connecting arms (54) are connected to each other, and the frame body (51) and the cantilever (53) are connected at the same time.

4. The precision, light and thin optical actuator according to claim 1, characterized in that: A mounting surface (7) is provided at the end of the base (1), and the circuit board (6) is arranged on the mounting surface (7).

5. A precision, light and thin optical actuator according to claim 4, characterized in that: The mounting is provided with a mounting hole (71), and the mounting hole (71) is used for mounting on an optical machine.

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