Sensor driving device and lens module

Abstract

A sensor driving device and a lens module. The sensor driving device comprises: a housing, a sensor assembly, a driving assembly, and an elastic support member, wherein the housing comprises a bottom plate and an upper cover that defines an accommodating space together with the bottom plate; the upper cover is provided with a light-transmitting aperture; the sensor assembly is arranged in the accommodating space and comprises a circuit board and a sensor; the driving assembly comprises a support, a magnetic circuit system, and a drive coil; the elastic support member comprises a first connecting portion, a second connecting portion, an abutment portion, and an resilient arm connecting the first connecting portion and the second connecting portion; the drive coil is fixed to the second connecting portion and extends into a magnetic gap; and the drive coil cooperates with the magnetic circuit system to drive the sensor assembly to move along an optical axis of a lens. In the present invention, by using a design solution in which the sensor moves, no additional movement space needs to be provided for the lens assembly. The sensor assembly can move in a relatively small space, thereby eliminating the need to additionally increase the display opening size of the lens, and effectively increasing the screen-to-body ratio.

Description

A sensor driving device and lens module Technical Field

[0001] The embodiments of the present invention belong to the technical field of shooting equipment, specifically relating to a sensor driving device and a lens module. Background Technology

[0002] Currently, the cameras used in AR glasses are limited by size and weight, and are all fixed-focus and without image stabilization. Therefore, small-size image stabilization design is very necessary.

[0003] In image stabilization design, conventional lens movement schemes would result in a larger screen opening, affecting the screen-to-body ratio. In addition, using a lens movement scheme requires reserving space for the lens movement within the housing of the drive unit, which is not conducive to the miniaturization design of the device.

[0004] Therefore, how to solve the above-mentioned technical problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide a sensor driving device and a lens module.

[0006] A first aspect of the present invention provides a sensor driving device, comprising:

[0007] The housing includes a base plate and an upper cover that covers the base plate and surrounds the base plate to form a receiving space. The upper cover has a light-transmitting hole that connects the receiving space to the outside world and is used to communicate with a lens.

[0008] A sensor assembly is disposed within the receiving space. The sensor assembly includes a circuit board and a sensor disposed on the side of the circuit board near the light-transmitting hole and electrically connected to the circuit board.

[0009] A drive assembly is disposed within the receiving space. The drive assembly includes a bracket fixed to a base plate, a magnetic circuit system fixed to the base plate, and a drive coil. The magnetic circuit system has a magnetic gap.

[0010] An elastic support member includes a first connecting part fixed to the bracket, a second connecting part fixed to the circuit board, an abutting part fixed to the base plate, and an elastic lever arm connecting the first connecting part and the second connecting part. The elastic support member suspends the sensor assembly within the receiving space.

[0011] The drive coil is fixed to the side of the second connection portion away from the circuit board and extends into the magnetic gap. The drive coil cooperates with the magnetic circuit system to drive the sensor assembly to move along the optical axis of the lens.

[0012] In some embodiments, the magnetic circuit system includes a first magnetic circuit assembly fixed to the base plate and a second magnetic circuit assembly disposed on the side of the first magnetic circuit assembly facing away from the base plate; the second magnetic circuit assembly is provided with the magnetic gap.

[0013] In some embodiments, the first magnetic circuit assembly includes a first outer ring magnet, a first inner ring magnet, and a non-magnetic region disposed between the first outer ring magnet and the first inner ring magnet; the first inner ring magnet is disposed inside the first outer ring magnet; wherein the magnetic poles of the first outer ring magnet and the first inner ring magnet are in opposite directions.

[0014] In some embodiments, the first magnetic circuit assembly is integrally formed using a four-pole magnetization process.

[0015] In some embodiments, the second magnetic circuit assembly includes a second outer ring magnet and a second inner ring magnet; the second inner ring magnet is disposed inside the second outer ring magnet; wherein the magnetic poles of the second outer ring magnet and the second inner ring magnet are opposite in direction, and the second outer ring magnet and the second inner ring magnet are spaced apart to form the magnetic gap.

[0016] In some embodiments, the first magnetic circuit assembly and the second magnetic circuit assembly are integrally formed using a four-pole magnetization process.

[0017] In some embodiments, the magnetic circuit system further includes a clamping plate disposed on the side of the second magnetic circuit assembly near the light-transmitting hole, the clamping plate having a clamping plate notch communicating with the magnetic gap.

[0018] In some embodiments, the second connection portion includes a thickened portion, to which the drive coil is fixed.

[0019] In some embodiments, the elastic lever arm includes a first lever arm connected to the first connecting portion, a second lever arm extending from the first lever arm by bending, and a third lever arm extending from the end of the second lever arm away from the first lever arm, the third lever arm being connected to the second connecting portion; the first lever arm and the third lever arm are disposed opposite to each other.

[0020] In some embodiments, there are two second connecting portions arranged at intervals between each other, each second connecting portion is fixedly connected to the drive coil, and the two second connecting portions are respectively connected to two different elastic lever arms, the extension directions of the third lever arms of the two elastic lever arms are opposite.

[0021] In some embodiments, the bracket includes a side wall fixed to the base plate and a top wall extending from the end of the side wall away from the base plate in a direction close to the optical axis, both the side wall and the top wall being fixedly connected to the magnetic circuit system.

[0022] In some embodiments, the bracket further includes a connecting post extending from the top wall in a direction away from the base plate, and the sensor assembly further includes a connecting protrusion disposed on the side of the circuit board away from the base plate and an elastic member connecting the connecting protrusion and the connecting post.

[0023] In some embodiments, the first connecting portion includes a connecting side edge connected to the side wall and a connecting top edge connected to the top wall.

[0024] In some embodiments, the top wall includes a clearance portion for clearing the elastic lever arm.

[0025] A second aspect of the present invention provides a lens module, comprising:

[0026] The sensor driving device described above;

[0027] The lens is disposed at the through hole at the top of the housing, and the lens is disposed correspondingly to the sensor assembly.

[0028] The beneficial effects of the embodiments of the present invention include:

[0029] In this invention, the fixed-focus image stabilization design employs a moving sensor assembly, eliminating the need for additional space for the lens assembly to move. The sensor assembly can move precisely within a smaller space, thus avoiding the need to increase the screen aperture size of the lens and effectively improving the screen-to-body ratio. Furthermore, compared to existing lens-moving solutions, the sensor assembly moving solution in this invention allows for a larger optical axis adjustment range because the sensor assembly can move directly along the optical axis, resulting in a larger field of view (FOV) with the same screen aperture size. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of a lens module according to an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of the lens module shown in Figure 1 along the AA direction, which shows the positional relationship between the sensor driving device, the sensor assembly and the lens.

[0032] Figure 3 is an enlarged schematic diagram of a partial structure of the lens module shown in Figure 2;

[0033] Figure 4 is a three-dimensional exploded view of the lens module shown in Figure 1;

[0034] Figure 5 is a schematic diagram of the overall structure of the elastic support, bracket and sensor assembly in one embodiment of the present invention.

[0035] Figure 6 is a schematic diagram of the overall structure of the elastic support and bracket in one embodiment of the present invention;

[0036] Figure 7 is an exploded perspective view of the overall structure of the elastic support and bracket shown in Figure 6;

[0037] Figure 8 is a partial enlarged schematic diagram of the elastic support member shown in Figure 7;

[0038] Figure 9 is a schematic diagram of the overall structure of the elastic support member in one embodiment of the present invention;

[0039] Figure 10 is a three-dimensional exploded view of the magnetic circuit system shown in Figure 7;

[0040] Figure 11 is a cross-sectional view of a magnetic circuit system according to an embodiment of the present invention; the figure shows the magnetic poles of the first outer ring magnet, the first inner ring magnet, the second outer ring magnet, and the second inner ring magnet, wherein the arrows point from the S pole to the N pole.

[0041] Figure 12 is a schematic diagram of the overall structure of the elastic element in one embodiment of the present invention;

[0042] Figure 13 is an exploded perspective view of the sensor assembly shown in Figure 4.

[0043] In the diagram, 100 is the lens module; 10 is the lens drive device; 20 is the sensor assembly; 30 is the lens; 11 is the housing; 12 is the elastic support; 13 is the drive assembly; 111 is the receiving space; 112 is the base plate; 113 is the light-transmitting hole; 114 is the bottom through hole; 115 is the top cover; 121 is the first connecting part; 122 is the second connecting part; 123 is the elastic lever arm; 1211 is the abutting part; 1212 is the connecting side; 1213 is the connecting top edge; 1221 is the thickened part; 1231 is the first lever arm; 1232 is the second lever arm; 1233 is the third lever arm; 131 is the bracket; 132 is the magnetic circuit system; 133 is the clamping plate; 134 is the drive coil; 1311 is the mounting cavity; 1312 is the opening; 1313 is the side wall. ; 1314, Top wall; 1315, Connecting column; 13141, Clearance; 1321, Magnetic gap; 1322, First magnetic circuit assembly; 1323, Second magnetic circuit assembly; 1324, Central through hole; 13221, First outer ring magnet; 13222, First inner ring magnet; 13223, Non-magnetic area; 13231, Second outer ring magnet; 13232, Second inner ring magnet; 1331, Outer ring plate; 1332, Inner ring plate; 1333, Clamping plate notch; 1334, Clamping plate through hole; 21, Circuit board; 22, Sensor; 23, Sensor bracket; 24, Filter; 25, Connecting protrusion; 26, Elastic element; 261, First connector; 262, Second connector; 263, Bending elastic element; 31, Optical axis. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0047] As shown in Figures 1-4, a sensor driving device 10 includes a housing 11, an elastic support member 12, a driving assembly 13, and a sensor driving assembly 20. The housing 11 includes a base plate 112 and an upper cover 115 that covers the base plate 112 and forms a receiving space 111 with the base plate 112. The upper cover 115 is provided with a light-transmitting hole 113 that communicates the receiving space 111 with the outside world. The light-transmitting hole 113 is used to communicate with a lens 30.

[0048] Sensor assembly 20 is disposed within receiving space 111. Sensor assembly 20 includes circuit board 21 and sensor 22 disposed on the side of circuit board 21 near light-transmitting hole 113 and electrically connected to circuit board 21. Driving assembly 13 is disposed within receiving space 111. Driving assembly 13 includes bracket 131 fixed to base plate 112, magnetic circuit system 132 fixed to base plate 112, and driving coil 134. Magnetic circuit system 132 has magnetic gap 1321.

[0049] The elastic support 12 includes a first connecting part 121 fixed to the bracket 131, a second connecting part 122 fixed to the circuit board 21, an abutting part 1211 fixed to the base plate 112, and an elastic lever arm 123 connecting the first connecting part 121 and the second connecting part 122. The elastic support 12 suspends the sensor assembly 20 in the receiving space 111.

[0050] The drive coil 134 is fixed to the side of the second connection 122 away from the circuit board 21 and extends into the magnetic gap 1321. The drive coil 134 cooperates with the magnetic circuit system 132 to drive the sensor assembly 20 to move along the optical axis 31 of the lens 30.

[0051] In this invention, the fixed-focus image stabilization design employs a moving sensor assembly 20, eliminating the need for additional movement space for the lens 30 assembly. The sensor assembly 20 can move precisely within a smaller space, thus avoiding the need to increase the screen aperture size of the lens 30 and effectively improving the screen-to-body ratio. Furthermore, compared to existing lens 30 movement solutions, the sensor assembly 20 movement solution in this invention allows for a larger adjustment range of the optical axis 31, enabling a larger field of view (FOV) with the same screen aperture size, since the sensor assembly 20 can move directly along the optical axis 31.

[0052] The axis of the light-transmitting aperture 113 coincides with the optical axis 31 of the lens 30. The sensor assembly 20 is arranged along the optical axis 31 of the lens 30 by means of the elastic support member 12 and corresponds to the position of the lens 30.

[0053] Referring to Figures 7 and 10-11, in some embodiments, the magnetic circuit system 132 includes a first magnetic circuit assembly 1322 fixed to the base plate 112 and a second magnetic circuit assembly 1323 disposed on the side of the first magnetic circuit assembly 1322 away from the base plate 112, and the second magnetic circuit assembly 1323 is provided with a magnetic gap 1321.

[0054] Specifically, along the optical axis 31 of the lens 30, a sensor assembly 20, a drive coil 134, and a magnetic circuit system 132 are arranged sequentially, wherein a first magnetic circuit assembly 1322 and a second magnetic circuit assembly 1323 are stacked along the optical axis 31 of the lens 30. The second magnetic circuit assembly 1323 corresponds to the drive coil 134 in position, and a magnetic gap 1321 adapted to the shape of the drive coil 134 is provided on the surface of the second magnetic circuit assembly 1323 facing the drive coil 134.

[0055] In some embodiments, the first magnetic circuit assembly 1322 includes a first outer ring magnet 13221, a first inner ring magnet 13222, and a non-magnetic region 13223 disposed between the first outer ring magnet 13221 and the first inner ring magnet 13222. The first inner ring magnet 13222 is disposed inside the first outer ring magnet 13221, wherein the magnetic poles of the first outer ring magnet 13221 and the first inner ring magnet 13222 have opposite directions.

[0056] Specifically, the axis of the first outer ring magnet 13221 coincides with the axis of the first inner ring magnet 13222, so that the magnetic field distribution between the first outer ring magnet 13221 and the first inner ring magnet 13222 is more uniform.

[0057] In one embodiment of the present invention, both the first outer ring magnet 13221 and the first inner ring magnet 13222 are rectangular rings. The first outer ring magnet 13221 has a rectangular inner ring space, and the first inner ring magnet 13222 has a circular inner ring space. The first inner ring magnet 13222 is disposed within the rectangular inner ring space of the first outer ring magnet 13221. Along the optical axis 31, the magnetic pole direction of the first outer ring magnet 13221 points towards the lens 30, and the magnetic pole direction of the first inner ring magnet 13222 points away from the lens 30.

[0058] In some embodiments, the first magnetic circuit assembly 1322 is integrally formed using a quadrupole magnetization process. Specifically, along the optical axis 31, the upper end face of the first outer ring magnet 13221 is set as the N pole, and the end face of the first outer ring magnet 13221 is set as the S pole. The upper end face of the first inner ring magnet 13222 is set as the S pole, and the lower end face of the first inner ring magnet 13222 is set as the N pole. A non-magnetic region 13223 is formed between the first outer ring magnet 13221 and the first inner ring magnet 13222, and the first outer ring magnet 13221 and the first inner ring magnet 13222 are integrally formed using a quadrupole magnetization process. It can be understood that quadrupole magnetization refers to magnetizing the magnets into four alternating magnetic poles (NSNS), forming four magnetic pole regions. This arrangement ensures that the magnetic field is uniformly distributed in multiple directions, reducing magnetic field distortion. In addition, the multi-pole magnetic field can better cooperate with the drive coil 134 to provide a more concentrated electromagnetic force, improve driving efficiency and response speed, and make it easier to achieve fine magnetic field control, which helps to improve the accuracy and stability of the movement of the sensor assembly 20.

[0059] In some embodiments, the second magnetic circuit assembly 1323 includes a second outer ring magnet 13231 and a second inner ring magnet 13232. The second inner ring magnet 13232 is disposed inside the second outer ring magnet 13231. The magnetic poles of the second outer ring magnet 13231 and the second inner ring magnet 13232 are opposite in direction, and the second outer ring magnet 13231 and the second inner ring magnet 13232 are spaced apart to form a magnetic gap 1321.

[0060] Specifically, the axis of the second outer ring magnet 13231 and the axis of the second inner ring magnet 13232 coincide, so that the magnetic field distribution between the first outer ring magnet 13221 and the first inner ring magnet 13222 is more uniform.

[0061] In one embodiment of the present invention, the driving coil 134 is in the shape of a rectangular ring. Both the second outer ring magnet 13231 and the second inner ring magnet 13232 are rectangular rings. The second outer ring magnet 13231 has a rectangular inner ring space, and the second inner ring magnet 13232 has a circular inner ring space. The second inner ring magnet 13232 is disposed within the rectangular inner ring space of the second outer ring magnet 13231. The outer ring of the second inner ring magnet 13232 and the inner ring of the second outer ring magnet 13231 are spaced apart by a certain distance to form a rectangular magnetic gap 1321, and the shape of the magnetic gap 1321 is adapted to the shape of the driving coil 134. Along the optical axis 31, the magnetic pole direction of the second outer ring magnet 13231 points towards the lens 30, and the magnetic pole direction of the second inner ring magnet 13232 faces away from the lens 30.

[0062] In some embodiments, both the first magnetic circuit assembly 1322 and the second magnetic circuit assembly 1323 are integrally formed using a quadrupole magnetization process. Specifically, along the optical axis 31, the upper end face of the second outer ring magnet 13231 is set as the N pole, and the lower end face of the second outer ring magnet 13231 is set as the S pole. The upper end face of the second inner ring magnet 13232 is set as the S pole, and the lower end face of the second inner ring magnet 13232 is set as the N pole. The second outer ring magnet 13231 and the second inner ring magnet 13232 are integrally formed using a quadrupole magnetization process. It can be understood that quadrupole magnetization refers to magnetizing the magnets into four alternating magnetic poles (NSNS), forming four magnetic pole regions. This arrangement ensures that the magnetic field is uniformly distributed in multiple directions, reducing magnetic field distortion. In addition, the multi-pole magnetic field can better cooperate with the drive coil 134 to provide a more concentrated electromagnetic force, improve driving efficiency and response speed, and make it easier to achieve fine magnetic field control, which helps to improve the accuracy and stability of the movement of the sensor assembly 20.

[0063] The first specific embodiment provided by the present invention includes:

[0064] The second outer ring magnet 13231 and the second inner ring magnet 13232 of the second magnetic circuit assembly 1323 are designed separately, while the first outer ring magnet 13221 and the first inner ring magnet 13222 of the first magnetic circuit assembly 1322 are integrally formed using a four-pole magnetization process. It can be understood that the second outer ring magnet 13231 and the second inner ring magnet 13232 of the second magnetic circuit assembly 1323 are designed separately, meaning that both the second outer ring magnet 13231 and the second inner ring magnet 13232 are manufactured separately and assembled to form the second magnetic circuit assembly 1323.

[0065] The second specific embodiment provided by the present invention includes:

[0066] The second outer ring magnet 13231 and the second inner ring magnet 13232 of the second magnetic circuit assembly 1323 are designed separately, as are the first outer ring magnet 13221 and the first inner ring magnet 13222 of the first magnetic circuit assembly 1322. It can be understood that the first outer ring magnet 13221 and the first inner ring magnet 13222 of the first magnetic circuit assembly 1322 are designed separately, meaning that both the first outer ring magnet 13221 and the first inner ring magnet 13222 are manufactured separately and assembled to form the first magnetic circuit assembly 1322.

[0067] The third specific embodiment provided by the present invention includes:

[0068] The second outer ring magnet 13231 and the second inner ring magnet 13232 of the second magnetic circuit assembly 1323 are integrally formed using a four-pole magnetization process, and the first outer ring magnet 13221 and the first inner ring magnet 13222 of the first magnetic circuit assembly 1322 are integrally formed using a four-pole magnetization process.

[0069] In some embodiments, the bracket 131 is rectangular and has a mounting cavity 1311 that matches the shape of the magnetic circuit system 132, within which the magnetic circuit system 132 is disposed. The mounting cavity 1311 of the bracket 131 can effectively fix the magnetic circuit system 132, thereby effectively reducing vibration mass and decreasing the degree of magnetic interference.

[0070] Specifically, referring to Figures 4 and 7, the bracket 131 also has a through-hole 1312 connecting the mounting cavity 1311. The through-hole 1312 corresponds to the position of the light-transmitting hole 113 and the bottom through-hole 114 of the housing 11, and the through-hole 1312 corresponds to the position of the magnetic gap 1321 of the magnetic circuit system 132. The drive coil 134 is disposed at the through-hole 1312 and corresponds to the magnetic gap 1321 via the elastic support 12. When current is conducted in the drive coil 134, the drive coil 134 moves through the through-hole 1312 under the action of force, so as to synchronously drive the sensor assembly 20 to move along the optical axis 31 of the lens 30, thereby realizing focus adjustment.

[0071] In some embodiments, a bottom through hole 114 is disposed on a base plate 112, and a central through hole 1324 is provided in the magnetic circuit system 132. The bottom through hole 114, the central through hole 1324, and the light-transmitting hole 113 are coaxially arranged. It is understood that the inner ring space of the first inner ring magnet 13222 and the inner ring space of the second inner ring magnet 13232 together form the central through hole 1324.

[0072] In some embodiments, the magnetic circuit system 132 further includes a clamping plate 133 disposed on the side of the second magnetic circuit assembly 1323 near the light-transmitting hole 113, and the clamping plate 133 is provided with a clamping plate notch 1333 communicating with the magnetic gap 1321.

[0073] Specifically, a clamping plate 133 is clamped between the top of the mounting cavity 1311 and the magnetic circuit system 132 to fix the magnetic circuit system 132 within the bracket 131. The clamping plate 133 has a clamping notch 1333 that matches the size of the magnetic gap 1321. The clamping plate 133 includes an outer ring plate 1331 and an inner ring plate 1332 disposed within the inner ring space of the outer ring plate 1331. The outer ring plate 1331 is adapted to the shape of the first outer ring magnet 13221 and the second outer ring magnet 13231, and the inner ring plate 1332 is adapted to the shape of the first inner ring magnet 13222 and the second inner ring magnet 13232. The inner ring of the outer ring plate 1331 and the outer ring of the inner ring plate 1332 are spaced apart by a certain distance to form the clamping notch 1333. A clamping through hole 1334, coaxial with the light-transmitting hole 113, is also formed on the inner ring plate 1332.

[0074] Referring to Figures 8-9, in some embodiments, the second connecting portion 122 includes a thickened portion 1221, to which the driving coil 134 is fixed. Specifically, the side of the thickened portion 1221 facing the light-transmitting hole 113 is used to support the sensor assembly 20, and the side of the thickened portion 1221 facing away from the light-transmitting hole 113 is fixedly connected to the driving coil 134.

[0075] The first connecting part 121 is surrounded on the outer wall of the bracket 131. The first connecting part 121 is fixedly connected to the bottom plate 112 of the housing 11 through the abutment part 1211. The end of the first connecting part 121 away from the bottom plate 112 is connected to the elastic lever arm 123.

[0076] The second connecting part 122 is in the shape of a sheet. Along the optical axis 31 of the lens 30, the projection of the second connecting part 122 covers a portion of the opening 1312 of the bracket 131.

[0077] In some embodiments, the elastic lever arm 123 includes a first lever arm 1231 connected to the first connecting portion 121, a second lever arm 1232 formed by bending and extending from the first lever arm 1231, and a third lever arm 1233 extending from one end of the second lever arm 1232 away from the first lever arm 1231. The third lever arm 1233 is connected to the second connecting portion 122, and the first lever arm 1231 and the third lever arm 1233 are disposed opposite to each other.

[0078] In some embodiments, the first lever arm 1231 and the third lever arm 1233 are arranged parallel to each other.

[0079] In one example, the elastic lever arm 123 is U-shaped. It is understood that the shape of the elastic lever arm 123 is not limited to U-shape, and the specific shape can be set as needed.

[0080] In some embodiments, there are two second connecting parts 122 that are spaced apart from each other. Each second connecting part 122 is fixedly connected to the drive coil 134. The two second connecting parts 122 are respectively connected to two different elastic arms 123. The extension directions of the third arms 1233 of the two elastic arms 123 are opposite. That is, there are two second connecting parts 122 and two elastic arms 123, and the two second connecting parts 122 are correspondingly connected to the two elastic arms 123.

[0081] In some embodiments, the bracket 131 includes a sidewall 1313 fixed to the base plate 112 and a top wall 1314 extending from the end of the sidewall 1313 away from the base plate 112, bent and extending in a direction close to the optical axis 31. Both the sidewall 1313 and the top wall 1314 are fixedly connected to the magnetic circuit system 132. The sidewall 1313 and the top wall 1314 together form a mounting cavity 1311, and the top wall 1314 extending from the end of the sidewall 1313 away from the base plate 112, bent and extending in a direction close to the optical axis 31, forms an opening 1312. A clamping plate 133 is clamped between the top wall 1314 and the magnetic circuit system 132 to fix the magnetic circuit system 132 within the mounting cavity 1311 of the bracket 131.

[0082] Referring to Figures 5-7 and 12, in some embodiments, the bracket 131 further includes a connecting post 1315 extending from the top wall 1314 in a direction away from the base plate 112, and the sensor assembly 20 further includes a connecting protrusion 25 disposed on the side of the circuit board 21 away from the base plate 112 and an elastic member 26 connecting the connecting protrusion 25 and the connecting post 1315.

[0083] In some embodiments, the bracket 131 is rectangular, and there are two connecting posts 1315 arranged diagonally on the bracket 131. There are also two connecting protrusions 25 and two elastic elements 26. Each connecting post 1315 is elastically connected to its corresponding connecting protrusion 25 via an elastic element 26. Further, the elastic element 26 includes a first connecting member 261 fixedly connected to the connecting post 1315, a second connecting member 262 fixedly connected to the connecting protrusion 25, and a bending elastic element 263 connecting the first connecting member 261 and the second connecting member 262.

[0084] In this invention, by arranging the connecting columns 1315 diagonally and connecting them with elastic elements 26, the stability of the entire structure can be further ensured when subjected to external forces, effectively controlling vibration. In addition, the presence of the bending elastic element 263 can act as a buffer when subjected to impact or vibration, reducing the force directly transmitted to other components, which is beneficial for suppressing vibration.

[0085] Referring to FIG9, in some embodiments, the first connecting portion 121 includes a connecting side edge 1212 connected to the side wall 1313 and a connecting top edge 1213 connected to the top wall 1314.

[0086] In some embodiments, the connecting side 1212 is semi-frame-shaped and surrounds the outer periphery of the side wall 1313. It is understood that "semi-frame-shaped" refers to having a portion of a complete frame, rather than being completely enclosed. The connecting top edge 1213 extends from the end of the connecting side 1212 away from the base plate 112 along a direction close to the optical axis, and the lower surface of the connecting top edge 1213 abuts against the upper surface of the top wall 1314. The end of the connecting top edge 1213 away from the connecting side 1212 is connected to the elastic lever arm 123.

[0087] In some embodiments, the top wall 1314 includes a clearance portion 13141 for clearing the elastic lever arm 123. Specifically, the clearance portion 13141 is recessed in the upper end face of the top wall 1314, and its position corresponds to the position of the elastic lever arm 123.

[0088] In some embodiments, a flexible circuit board is printed on the elastic support 12. When the elastic support 12 supports the circuit board 21 of the sensor assembly 20, the flexible circuit board enables the electrical connection between the sensor assembly 20 and the drive coil 134, so that the elastic support 12 can conduct the current of the sensor assembly 20 to the drive coil 134.

[0089] Referring to Figures 1 and 13, a second aspect of an embodiment of the present invention provides a lens module 100, including a sensor driving device 10, a sensor assembly 20, and a lens 30. The sensor driving device 10 has a housing 11, the sensor assembly 20 is disposed within the housing 11 and connected to an elastic support member 12, and the lens 30 is disposed at a light-transmitting hole 113 at the top of the housing 11. The lens 30 and the sensor assembly 20 are correspondingly arranged, wherein the lens 30 is disposed in the light-transmitting hole 113. Along the optical axis 31 of the lens 30, the lens 30, the sensor assembly 20, and the sensor driving device 10 are arranged sequentially, and the sensor driving device 10 is used to drive the sensor assembly 20 to move along the optical axis 31 of the lens 30.

[0090] Specifically, the current generated by the sensor assembly 20 is conducted to the drive coil 134 of the sensor drive device 10 through the elastic support 12. When there is current in the drive coil 134, the force generated by the interaction between the magnetic field of the drive coil 134 and the magnetic field of the magnetic circuit system 132 acts on the sensor assembly 20, so that the sensor assembly 20 moves along the optical axis 31 of the lens 30 to achieve focal length adjustment.

[0091] In this invention, the fixed-focus image stabilization design employs a moving sensor assembly 20, eliminating the need for additional movement space for the lens 30 assembly. The sensor assembly 20 can move precisely within a smaller space, thus avoiding the need to increase the screen aperture size of the lens 30 and effectively improving the screen-to-body ratio. Furthermore, compared to existing lens 30 movement solutions, the sensor assembly 20 movement solution in this invention allows for a larger adjustment range of the optical axis 31, enabling a larger field of view (FOV) with the same screen aperture size, since the sensor assembly 20 can move directly along the optical axis 31.

[0092] The sensor assembly 20 includes a circuit board 21, a sensor 22, a sensor bracket 23, and a filter 24 stacked in sequence. The sensor bracket 23 is used to cover the sensor 22 on the circuit board 21. The sensor bracket 23 has a mounting groove that matches the shape of the filter 24, and the filter 24 is disposed in the mounting groove.

[0093] Specifically, the second connecting part 122 of the elastic support member 12 supports the circuit board 21 and is electrically connected to it on the side near the light-transmitting hole 113, and the side of the second connecting part 122 away from the light-transmitting hole 113 is fixedly connected to the drive coil 134.

[0094] A third aspect of the present invention provides AR glasses, the AR glasses including the lens module 100 described above.

[0095] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A sensor driving device, characterized in that, include: The housing includes a base plate and an upper cover that covers the base plate and surrounds the base plate to form a receiving space. The upper cover has a light-transmitting hole that connects the receiving space to the outside world and is used to communicate with a lens. A sensor assembly is disposed within the receiving space. The sensor assembly includes a circuit board and a sensor disposed on the side of the circuit board near the light-transmitting hole and electrically connected to the circuit board. A drive assembly is disposed within the receiving space. The drive assembly includes a bracket fixed to a base plate, a magnetic circuit system fixed to the base plate, and a drive coil. The magnetic circuit system has a magnetic gap. An elastic support member includes a first connecting part fixed to the bracket, a second connecting part fixed to the circuit board, an abutting part fixed to the base plate, and an elastic lever arm connecting the first connecting part and the second connecting part. The elastic support member suspends the sensor assembly within the receiving space. The drive coil is fixed to the side of the second connection portion away from the circuit board and extends into the magnetic gap. The drive coil cooperates with the magnetic circuit system to drive the sensor assembly to move along the optical axis of the lens.

2. The sensor driving device according to claim 1, characterized in that, The magnetic circuit system includes a first magnetic circuit assembly fixed to the base plate and a second magnetic circuit assembly disposed on the side of the first magnetic circuit assembly facing away from the base plate; the second magnetic circuit assembly is provided with the magnetic gap.

3. The sensor driving device according to claim 2, characterized in that, The first magnetic circuit assembly includes a first outer ring magnet, a first inner ring magnet, and a non-magnetic region disposed between the first outer ring magnet and the first inner ring magnet; the first inner ring magnet is disposed inside the first outer ring magnet; wherein the magnetic poles of the first outer ring magnet and the first inner ring magnet are opposite in direction.

4. The sensor driving device according to claim 3, characterized in that, The first magnetic circuit assembly is integrally formed using a four-pole magnetization process.

5. The sensor driving device according to claim 3, characterized in that, The second magnetic circuit assembly includes a second outer ring magnet and a second inner ring magnet; the second inner ring magnet is disposed inside the second outer ring magnet; wherein the magnetic poles of the second outer ring magnet and the second inner ring magnet are opposite in direction, and the second outer ring magnet and the second inner ring magnet are spaced apart to form the magnetic gap.

6. The sensor driving device according to claim 5, characterized in that, The first magnetic circuit assembly and the second magnetic circuit assembly are integrally formed using a four-pole magnetization process.

7. A sensor driving device according to claim 2, characterized in that, The magnetic circuit system further includes a clamping plate disposed on the side of the second magnetic circuit assembly near the light-transmitting hole, and the clamping plate is provided with a clamping plate notch communicating with the magnetic gap.

8. A sensor driving device according to claim 1, characterized in that, The second connecting portion includes a thickened portion, and the driving coil is fixed to the thickened portion.

9. The sensor driving device according to claim 2, characterized in that, The elastic lever arm includes a first lever arm connected to the first connecting portion, a second lever arm extending from the first lever arm by bending, and a third lever arm extending from the end of the second lever arm away from the first lever arm. The third lever arm is connected to the second connecting portion. The first lever arm and the third lever arm are arranged opposite to each other.

10. A sensor driving device according to claim 9, characterized in that, There are two second connecting parts, which are spaced apart from each other. Each second connecting part is fixedly connected to the drive coil. The two second connecting parts are respectively connected to two different elastic lever arms, and the extension directions of the third lever arms of the two elastic lever arms are opposite.

11. The sensor driving device according to claim 1, characterized in that, The bracket includes a side wall fixed to the base plate and a top wall extending from the end of the side wall away from the base plate in a direction close to the optical axis. Both the side wall and the top wall are fixedly connected to the magnetic circuit system.

12. The sensor driving device according to claim 11, characterized in that, The bracket also includes a connecting post extending from the top wall in a direction away from the base plate, and the sensor assembly also includes a connecting protrusion disposed on the side of the circuit board away from the base plate and an elastic element connecting the connecting protrusion and the connecting post.

13. The sensor driving device according to claim 11, characterized in that, The first connecting portion includes a connecting side edge connected to the side wall and a connecting top edge connected to the top wall.

14. The sensor driving device according to claim 11, characterized in that, The top wall includes a clearance section for preventing the elastic lever arm from passing through.

15. A lens module, characterized in that, include: The sensor driving device according to any one of claims 1-4; The lens is disposed at the through hole at the top of the housing, and the lens is disposed correspondingly to the sensor assembly.

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