Sensor driving device and lens module

Abstract

The embodiment of the invention provides a sensor driving device and a lens module, and the sensor driving device comprises a housing which comprises a bottom plate and an upper cover which forms an accommodation space with the bottom plate, and the upper cover is provided with a light through hole; the sensor assembly is arranged in the accommodating space and comprises a circuit board, a sensor and a driving assembly; the driving assembly comprises a support, a magnetic circuit system and a driving coil. The elastic supporting piece comprises a first connecting part, a second connecting part, an abutting part and an elastic force arm connected with the first connecting part and the second connecting part. The driving coil is fixed on the second connecting part and extends into the magnetic gap. The driving coil cooperates with the magnetic circuit system to drive the sensor assembly to move along the optical axis direction of the lens. According to the invention, the design scheme of the mobile sensor is adopted, an additional moving space does not need to be provided for the lens assembly, and the sensor assembly can move in a smaller space, so that the screen opening size of the lens does not need to be additionally increased, and the screen-to-body ratio is effectively improved.

Description

Technical Field

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

[0002] The cameras currently used on AR glasses are limited by size and weight, and are all fixed-focus and non-stabilization designs, so a small-size anti-shake design is very necessary.

[0003] In the anti-shake design, the conventional dynamic lens movement solution will cause the screen opening to become larger, affecting the screen-to-body ratio. In addition, the lens movement solution requires reserving moving space for the movement of the lens in the housing of the drive device, which is not conducive to the miniaturization design of the equipment.

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

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

[0006] According to a first aspect of an embodiment of the present invention, a sensor driving device is provided, comprising:

[0007] A housing, the housing comprising a bottom plate and an upper cover which is arranged on the bottom plate and surrounds the bottom plate to form a receiving space, the upper cover being provided with a light-through hole which connects the receiving space with the outside, and the light-through hole is used to communicate with the lens;

[0008] A sensor assembly, the sensor assembly is arranged in the receiving space, the sensor assembly comprises a circuit board, and a sensor arranged on a side of the circuit board close to the light through hole and electrically connected to the circuit board;

[0009] A driving assembly, the driving assembly is arranged in the receiving space, the driving assembly comprises a bracket fixed to the bottom plate, a magnetic circuit system fixed to the bottom plate, and a driving coil, the magnetic circuit system has a magnetic gap;

[0010] an elastic support member, the elastic support member comprising a first connection portion fixed to the bracket, a second connection portion fixed to the circuit board, an abutment portion fixed to the bottom plate, and an elastic force arm connecting the first connection portion and the second connection portion, the elastic support member suspends the sensor assembly in the receiving space;

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

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

[0013] In some embodiments, the first magnetic circuit assembly includes a first outer ring magnetic steel, a first inner ring magnetic steel, and a non-magnetic area arranged between the first outer ring magnetic steel and the first inner ring magnetic steel; the first inner ring magnetic steel is arranged on the inner side of the first outer ring magnetic steel; wherein the magnetic poles of the first outer ring magnetic steel and the first inner ring magnetic steel are in opposite directions.

[0014] In some embodiments, the first magnetic circuit component is integrally formed using a quadrupole magnetization process.

[0015] In some embodiments, the second magnetic circuit assembly includes a second outer ring magnetic steel and a second inner ring magnetic steel; the second inner ring magnetic steel is arranged on the inner side of the second outer ring magnetic steel; wherein the magnetic pole directions of the second outer ring magnetic steel and the second inner ring magnetic steel are opposite, and the second outer ring magnetic steel and the second inner ring magnetic steel are spaced apart from each other to form the magnetic gap.

[0016] In some embodiments, the first magnetic circuit component and the second magnetic circuit component are integrally formed using a quadrupole magnetization process.

[0017] In some embodiments, the magnetic circuit system further includes a clamping plate disposed on a side of the second magnetic circuit component close to the light-through hole, and the clamping plate is provided with a clamping plate notch connected to the magnetic gap.

[0018] In some embodiments, the second connecting portion includes a thickened portion, and the driving coil is fixed to the thickened portion.

[0019] In some embodiments, the elastic force arm includes a first force arm connected to the first connecting portion, a second force arm bent and extended from the first force arm, and a third force arm extending from one end of the second force arm away from the first force arm, and the third force arm is connected to the second connecting portion; the first force arm and the third force arm are arranged opposite to each other.

[0020] In some embodiments, there are two second connecting parts and they are spaced apart from each other, each second connecting part is fixedly connected to the driving coil, two second connecting parts are respectively connected to two different elastic force arms, and the extension directions of the third force arms of the two elastic force arms are opposite.

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

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

[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 avoiding the elastic force arm.

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

[0026] The sensor driving device described above;

[0027] A lens is arranged at the through hole on the top of the shell, and the lens is arranged corresponding to the sensor component.

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

[0029] In the fixed-focus anti-shake design of the present invention, in the design scheme using a mobile sensor assembly, there is no need to provide additional moving space for the lens assembly, and the sensor assembly can be accurately moved in a smaller space, so there is no need to increase the screen opening size of the lens, effectively improving the screen-to-body ratio. In addition, compared with the existing lens movement scheme, the present invention uses a sensor assembly movement scheme, because the sensor assembly can be moved directly in the optical axis direction, a larger optical axis adjustment range can be achieved, so that the field of view (FOV) can be made larger under the same screen opening size. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 2 for Figure 1 A cross-sectional view of the lens module along the AA direction shown in FIG. 1 , wherein the positional relationship among the sensor driving device, the sensor assembly and the lens is schematically shown;

[0032] Figure 3 for Figure 2 An enlarged schematic diagram of the local structure of the lens module shown in ;

[0033] Figure 4 for Figure 1 A three-dimensional exploded view of the lens module shown in FIG.

[0034] Figure 5 This is a schematic diagram of the overall structure of an elastic support member, a bracket and a sensor assembly according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the overall structure of an elastic support member and a bracket according to an embodiment of the present invention;

[0036] Figure 7 for Figure 6 A three-dimensional exploded view of the overall structure of the elastic support member and the bracket shown in FIG.

[0037] Figure 8 for Figure 7 An enlarged schematic diagram of a local structure of the elastic support member shown in ;

[0038] Fig. 9 This is a schematic diagram of the overall structure of an elastic support member according to an embodiment of the present invention;

[0039] Fig.10 for Figure 7 A three-dimensional exploded view of the magnetic circuit system shown in;

[0040] Fig.11 It is a cross-sectional view of a magnetic circuit system of an embodiment of the present invention; the figure schematically shows the magnetic poles of the first outer ring magnetic steel, the first inner ring magnetic steel, the second outer ring magnetic steel, and the second inner ring magnetic steel, wherein the direction of the arrow is from the S pole to the N pole;

[0041] Fig.12 This is a schematic diagram of the overall structure of an elastic member in an embodiment of the present invention;

[0042] Fig.13 for Figure 4 An exploded perspective view of the sensor assembly shown in FIG.

[0043] In the figure, 100, lens module; 10, lens driving device; 20, sensor assembly; 30, lens; 11, housing; 12, elastic support member; 13, driving assembly; 111, accommodating space; 112, bottom plate; 113, light hole; 114, bottom through hole; 115, upper cover; 121, first connecting part; 122, second connecting part; 123, elastic force arm; 1211, abutting part; 1212, connecting side edge; 1213, connecting top edge; 1221, thickening part; 1231, first force arm; 1232, second force arm; 1233, third force arm; 131, bracket; 132, magnetic circuit system; 133, clamping plate; 134, driving coil; 1311, installation cavity; 1312, through opening; 1313, side wall ;1314, top wall;1315, connecting column;13141, air avoidance;1321, magnetic gap;1322, first magnetic circuit component;1323, second magnetic circuit component;1324, center through hole;13221, first outer ring magnetic steel;13222, first inner ring magnetic steel;13223, non-magnetic area;13231, second outer ring magnetic steel;13232, second inner ring magnetic steel;1331, outer ring plate;1332, inner ring plate;1333, splint notch;1334, splint through hole;21, circuit board;22, sensor;23, sensor bracket;24, filter;25, connecting protrusion;26, elastic member;261, first connecting member;262, second connecting member;263, bending elastic member;31, optical axis. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0046] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] like Figure 1-4 As shown, 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 bottom plate 112 and an upper cover 115 which is covered on the bottom plate 112 and encloses the bottom plate 112 to form a receiving space 111. The upper cover 115 is provided with a light hole 113 which connects the receiving space 111 with the outside, and the light hole 113 is used to communicate with the lens 30.

[0048] The sensor assembly 20 is disposed in the receiving space 111, and includes a circuit board 21, and a sensor 22 disposed on a side of the circuit board 21 close to the light hole 113 and electrically connected to the circuit board 21. The driving assembly 13 is disposed in the receiving space 111, and includes a bracket 131 fixed to the bottom plate 112, a magnetic circuit system 132 fixed to the bottom plate 112, and a driving coil 134, and the magnetic circuit system 132 has a magnetic gap 1321.

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

[0050] The driving coil 134 is fixed to a side of the second connecting portion 122 away from the circuit board 21 and extends into the magnetic gap 1321 . The driving 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 the fixed-focus anti-shake design of the present invention, in the design scheme using the mobile sensor assembly 20, there is no need to provide additional moving space for the lens 30 assembly, and the sensor assembly 20 can be accurately moved in a smaller space, so there is no need to increase the screen opening size of the lens 30, effectively improving the screen-to-body ratio. In addition, compared with the existing lens 30 moving scheme, the present invention uses the sensor assembly 20 moving scheme, because the sensor assembly 20 can be directly moved in the direction of the optical axis 31, a larger adjustment range of the optical axis 31 can be achieved, so that the field of view (FOV) can be made larger under the same screen opening size.

[0052] The axis of the light hole 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 through the support of the elastic support member 12 and corresponds to the position of the lens 30.

[0053] refer to Figure 7 and Figure 10-11 In some embodiments, the magnetic circuit system 132 includes a first magnetic circuit component 1322 fixed to the base plate 112 and a second magnetic circuit component 1323 disposed on a side of the first magnetic circuit component 1322 away from the base plate 112 , and a magnetic gap 1321 is disposed on the second magnetic circuit component 1323 .

[0054] Specifically, the sensor assembly 20, the drive coil 134 and the magnetic circuit system 132 are sequentially arranged along the optical axis 31 of the lens 30, wherein the first magnetic circuit assembly 1322 and the 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 position of the drive coil 134, and a magnetic gap 1321 matching 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 magnetic steel 13221, a first inner ring magnetic steel 13222, and a non-magnetic region 13223 disposed between the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222. The first inner ring magnetic steel 13222 is disposed on the inner side of the first outer ring magnetic steel 13221, wherein the magnetic poles of the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 are in opposite directions.

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

[0057] In an example provided by the present invention, the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 are both rectangular ring-shaped, the first outer ring magnetic steel 13221 has a rectangular inner ring space, and the first inner ring magnetic steel 13222 has a circular inner ring space, wherein the first inner ring magnetic steel 13222 is arranged in the rectangular inner ring space of the first outer ring magnetic steel 13221. Along the direction of the optical axis 31, the magnetic pole direction of the first outer ring magnetic steel 13221 points to the lens 30, and the magnetic pole direction of the first inner ring magnetic steel 13222 is away from the lens 30.

[0058] In some embodiments, the first magnetic circuit component 1322 is integrally formed using a quadrupole magnetization process. Specifically, along the direction of the optical axis 31, the upper end surface of the first outer ring magnetic steel 13221 is set to an N pole, and the end surface of the first outer ring magnetic steel 13221 is set to an S pole. The upper end surface of the first inner ring magnetic steel 13222 is set to an S pole, and the lower end surface of the first inner ring magnetic steel 13222 is set to an N pole, wherein a non-magnetic area 13223 is formed between the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222, and the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 are integrally formed using a quadrupole magnetization process. It can be understood that quadrupole magnetization refers to magnetizing the magnetic steel into four alternating magnetic poles (NSNS) to form four magnetic pole regions. This setting method can ensure that the magnetic field is evenly distributed in multiple directions, reducing magnetic field distortion. In addition, the multi-pole magnetic field can better cooperate with the drive coil 134, provide a more concentrated electromagnetic force, improve the driving efficiency and response speed, and more easily 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 magnetic steel 13231 and a second inner ring magnetic steel 13232, and the second inner ring magnetic steel 13232 is arranged on the inner side of the second outer ring magnetic steel 13231, wherein the magnetic poles of the second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 are in opposite directions, and the second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 are spaced apart from each other to form a magnetic gap 1321.

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

[0061] In an example provided by the present invention, the driving coil 134 is in a rectangular ring shape. The second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 are both in a rectangular ring shape, the second outer ring magnetic steel 13231 has a rectangular inner ring space, and the second inner ring magnetic steel 13232 has a circular inner ring space, wherein the second inner ring magnetic steel 13232 is arranged in the rectangular inner ring space of the second outer ring magnetic steel 13231. The outer ring of the second inner ring magnetic steel 13232 and the inner ring of the second outer ring magnetic steel 13231 are arranged at a certain distance from each other to form a rectangular ring-shaped magnetic gap 1321, and the shape of the magnetic gap 1321 is adapted to the shape of the driving coil 134. Along the direction of the optical axis 31, the magnetic pole direction of the second outer ring magnetic steel 13231 points to the lens 30, and the magnetic pole direction of the second inner ring magnetic steel 13232 is away from the lens 30.

[0062] In some embodiments, the first magnetic circuit component 1322 and the second magnetic circuit component 1323 are both integrally formed using a quadrupole magnetization process. Specifically, along the direction of the optical axis 31, the upper end surface of the second outer ring magnetic steel 13231 is set to the N pole, and the lower end surface of the second outer ring magnetic steel 13231 is set to the S pole. The upper end surface of the second inner ring magnetic steel 13232 is set to the S pole, and the lower end surface of the second inner ring magnetic steel 13232 is set to the N pole, and the second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 are integrally formed using a quadrupole magnetization process. It can be understood that quadrupole magnetization refers to magnetizing the magnetic steel into four alternating magnetic poles (NSNS) to form four magnetic pole regions. This setting method can ensure that the magnetic field is evenly distributed in multiple directions, reducing magnetic field distortion. In addition, the multi-pole magnetic field can better cooperate with the drive coil 134, provide a more concentrated electromagnetic force, improve the driving efficiency and response speed, and more easily 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 magnetic steel 13231 and the second inner ring magnetic steel 13232 of the second magnetic circuit component 1323 are of split design, and the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 of the first magnetic circuit component 1322 are integrally formed by a four-pole magnetization process. It can be understood that the second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 of the second magnetic circuit component 1323 are of split design, that is, the second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 are separately manufactured and formed, and the second magnetic circuit component 1323 is manufactured by assembly.

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

[0066] The second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 of the second magnetic circuit assembly 1323 are of split design, and the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 of the first magnetic circuit assembly 1322 are of split design. It can be understood that the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 of the first magnetic circuit assembly 1322 are of split design, that is, the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 are separately manufactured and formed, and the first magnetic circuit assembly 1322 is manufactured by assembly.

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

[0068] The second outer ring magnetic steel 13231 and the second inner ring magnetic steel 13232 of the second magnetic circuit component 1323 are integrally formed by a four-pole magnetization process, and the first outer ring magnetic steel 13221 and the first inner ring magnetic steel 13222 of the first magnetic circuit component 1322 are integrally formed by 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. The magnetic circuit system 132 is surrounded by the mounting cavity 1311. The mounting cavity 1311 of the bracket 131 can effectively fix the magnetic circuit system 132, thereby effectively reducing the vibration quality and the degree of magnetic interference.

[0070] For details, please refer to Figure 4 and Figure 7 The bracket 131 also has a through-port 1312 connected to the mounting cavity 1311. The through-port 1312 corresponds to the positions of the light-through hole 113 and the bottom through-port 114 of the housing 11, and the through-port 1312 corresponds to the position of the magnetic gap 1321 of the magnetic circuit system 132. The driving coil 134 is arranged at the through-port 1312 through the elastic support member 12 and corresponds to the magnetic gap 1321. When current is conducted in the driving coil 134, the driving coil 134 moves through the through-port 1312 along the optical axis 31 of the lens 30 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 to achieve focal length adjustment.

[0071] In some embodiments, the bottom through hole 114 is disposed on the bottom plate 112, and the magnetic circuit system 132 has a central through hole 1324, wherein the bottom through hole 114, the central through hole 1324 and the light through hole 113 are coaxially disposed. It can be understood that the inner ring space of the first inner ring magnetic steel 13222 and the inner ring space of the second inner ring magnetic steel 13232 together enclose the central through hole 1324.

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

[0073] Specifically, the clamping plate 133 is sandwiched between the top of the installation cavity 1311 and the magnetic circuit system 132, and is used to fix the magnetic circuit system 132 in the bracket 131, wherein the clamping plate 133 is provided with a clamping plate gap 1333 of a size suitable for the magnetic gap 1321. The clamping plate 133 includes an outer ring plate 1331 and an inner ring plate 1332 disposed in 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 magnetic steel 13221 and the second outer ring magnetic steel 13231, and the inner ring plate 1332 is adapted to the shape of the first inner ring magnetic steel 13222 and the second inner ring magnetic steel 13232. The inner ring of the outer ring plate 1331 and the outer ring of the inner ring plate 1332 are arranged at a certain distance from each other to form a clamping plate gap 1333, and a clamping plate through hole 1334 coaxial with the light through hole 113 is also formed on the inner ring plate 1332.

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

[0075] The first connection portion 121 is disposed around the outer wall of the bracket 131 , and is fixedly connected to the bottom plate 112 of the housing 11 via the abutment portion 1211 . One end of the first connection portion 121 away from the bottom plate 112 is connected to the elastic force arm 123 .

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

[0077] In some embodiments, the elastic force arm 123 includes a first force arm 1231 connected to the first connecting portion 121, a second force arm 1232 bent and extended from the first force arm 1231, and a third force arm 1233 extending from one end of the second force arm 1232 away from the first force arm 1231, the third force arm 1233 is connected to the second connecting portion 122, and the first force arm 1231 and the third force arm 1233 are arranged opposite to each other.

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

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

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

[0081] In some embodiments, the bracket 131 includes a side wall 1313 fixed to the bottom plate 112, and a top wall 1314 that bends and extends from one end of the side wall 1313 away from the bottom plate 112 in a direction close to the optical axis 31, and the side wall 1313 and the top wall 1314 are both fixedly connected to the magnetic circuit system 132. The side wall 1313 and the top wall 1314 together enclose the installation cavity 1311, and the top wall 1314 that bends and extends from one end of the side wall 1313 away from the bottom plate 112 in a direction close to the optical axis 31 encloses the through opening 1312. The clamping plate 133 is sandwiched between the top wall 1314 and the magnetic circuit system 132, and is used to fix the magnetic circuit system 132 in the installation cavity 1311 of the bracket 131.

[0082] refer to Figure 5-7 12. In some embodiments, the bracket 131 also includes a connecting column 1315 extending from the top wall 1314 in a direction away from the bottom plate 112, and the sensor assembly 20 also includes a connecting protrusion 25 arranged on the side of the circuit board 21 away from the bottom plate 112 and an elastic member 26 connecting the connecting protrusion 25 and the connecting column 1315.

[0083] In some embodiments, the bracket 131 is rectangular, there are two connecting posts 1315 and they are diagonally arranged on the bracket 131, there are two connecting protrusions 25 and two elastic members 26, and each connecting post 1315 is elastically connected to the corresponding connecting protrusion 25 through an elastic member 26. Further, the elastic member 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 member 263 connecting the first connecting member 261 and the second connecting member 262.

[0084] In the present invention, by arranging the connecting column 1315 diagonally and connecting it with the elastic member 26, the stability of the entire structure can be further maintained when subjected to external force, and the shaking can be effectively controlled. In addition, the existence of the bent elastic member 263 can play a buffering role when subjected to impact or vibration, reducing the force directly transmitted to other components, which is conducive to the suppression of shaking.

[0085] refer to Fig. 9 In some embodiments, the first connection portion 121 includes a connection side edge 1212 connected to the side wall 1313 and a connection top edge 1213 connected to the top wall 1314 .

[0086] In some embodiments, the connecting side edge 1212 is semi-frame-shaped and is arranged around the outer periphery of the side wall 1313. It is understandable that the semi-frame-shaped refers to a part of a complete frame, rather than a completely closed periphery. The connecting top edge 1213 extends from the end of the connecting side edge 1212 away from the bottom plate 112 along the 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, and the end of the connecting top edge 1213 away from the connecting side edge 1212 is connected to the elastic force arm 123.

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

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

[0089] refer to Figure 1 and Fig.13 According to a second aspect of an embodiment of the present invention, a lens module 100 is provided, comprising 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 arranged in the housing 11, the sensor assembly 20 is connected to the elastic support member 12, the lens 30 is arranged at the light through hole 113 at the top of the housing 11, and the lens 30 is arranged corresponding to the sensor assembly 20, wherein the lens 30 is arranged at the light through hole 113, along the direction of the optical axis 31 of the lens 30, the lens 30, the sensor assembly 20 and the sensor driving device 10 are arranged in sequence, and the sensor driving device 10 is used to drive the sensor assembly 20 to move along the direction of the optical axis 31 of the lens 30.

[0090] Specifically, the current generated by the sensor component 20 is conducted to the drive coil 134 of the sensor drive device 10 through the elastic support member 12. When current is conducted 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 component 20, so that the sensor component 20 moves along the optical axis 31 of the lens 30 to achieve focal length adjustment.

[0091] In the fixed-focus anti-shake design of the present invention, in the design scheme using the mobile sensor assembly 20, there is no need to provide additional moving space for the lens 30 assembly, and the sensor assembly 20 can be accurately moved in a smaller space, so there is no need to increase the screen opening size of the lens 30, effectively improving the screen-to-body ratio. In addition, compared with the existing lens 30 moving scheme, the present invention uses the sensor assembly 20 moving scheme, because the sensor assembly 20 can be directly moved in the direction of the optical axis 31, a larger adjustment range of the optical axis 31 can be achieved, so that the field of view (FOV) can be made larger under the same screen opening size.

[0092] The sensor assembly 20 includes a circuit board 21, a sensor 22, a sensor bracket 23 and a filter 24 which are 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 arranged in the mounting groove.

[0093] Specifically, the side of the second connection portion 122 of the elastic support member 12 close to the light hole 113 supports the circuit board 21 and is electrically connected thereto, and the side of the second connection portion 122 away from the light hole 113 is fixedly connected to the driving coil 134 .

[0094] According to a third aspect of an embodiment of the present invention, an AR glasses is provided, and the AR glasses include the lens module 100 mentioned above.

[0095] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill 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: A housing, the housing comprising a bottom plate and an upper cover which is arranged on the bottom plate and surrounds the bottom plate to form a receiving space, the upper cover being provided with a light-through hole which connects the receiving space with the outside, and the light-through hole is used to communicate with the lens; A sensor assembly, the sensor assembly is arranged in the receiving space, the sensor assembly comprises a circuit board, and a sensor arranged on a side of the circuit board close to the light through hole and electrically connected to the circuit board; A driving assembly, the driving assembly is arranged in the receiving space, the driving assembly comprises a bracket fixed to the bottom plate, a magnetic circuit system fixed to the bottom plate, and a driving coil, the magnetic circuit system has a magnetic gap; an elastic support member, the elastic support member comprising a first connection portion fixed to the bracket, a second connection portion fixed to the circuit board, an abutment portion fixed to the bottom plate, and an elastic force arm connecting the first connection portion and the second connection portion, the elastic support member suspends the sensor assembly in the receiving space; The driving coil is fixed to a side of the second connecting portion away from the circuit board and extends into the magnetic gap. The driving coil cooperates with the magnetic circuit system to drive the sensor assembly to move along the optical axis direction of the lens.

2. The sensor driving device according to claim 1, characterized in that: The magnetic circuit system comprises a first magnetic circuit component fixed to the base plate and a second magnetic circuit component arranged on a side of the first magnetic circuit component away from the base plate; the magnetic gap is arranged on the second magnetic circuit component.

3. The sensor driving device according to claim 2, characterized in that: The first magnetic circuit component includes a first outer ring magnetic steel, a first inner ring magnetic steel and a non-magnetic area arranged between the first outer ring magnetic steel and the first inner ring magnetic steel; the first inner ring magnetic steel is arranged on the inner side of the first outer ring magnetic steel; wherein the magnetic poles of the first outer ring magnetic steel and the first inner ring magnetic steel are in opposite directions.

4. The sensor driving device according to claim 3, characterized in that: The first magnetic circuit component is integrally formed by adopting 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 magnetic steel and a second inner ring magnetic steel; the second inner ring magnetic steel is arranged on the inner side of the second outer ring magnetic steel; wherein the magnetic pole directions of the second outer ring magnetic steel and the second inner ring magnetic steel are opposite, and the second outer ring magnetic steel and the second inner ring magnetic steel are spaced apart from each other to form the magnetic gap.

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

7. A sensor driving device according to claim 2, characterized in that: The magnetic circuit system further comprises a clamping plate arranged on a side of the second magnetic circuit component close to the light-through hole, and the clamping plate is provided with a clamping plate notch connected to the magnetic gap.

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

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

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

11. The sensor driving device according to claim 1, characterized in that: The bracket includes a side wall fixed to the bottom plate, and a top wall bent and extended from an end of the side wall away from the bottom plate in a direction close to the optical axis. The side wall and the top wall are both 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 column extending from the top wall in a direction away from the bottom plate, and the sensor assembly also includes a connecting protrusion arranged on a side of the circuit board away from the bottom plate and an elastic member connecting the connecting protrusion and the connecting column.

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 comprises a space-avoiding portion for avoiding the elastic force arm.

15. A lens module, characterized in that: include: The sensor driving device according to any one of claims 1 to 4; A lens is arranged at the through hole on the top of the shell, and the lens is arranged corresponding to the sensor component.

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