Sensor driving device and lens module
By employing a design scheme that uses a moving sensor component in AR glasses, the sensor component moves along the optical axis, solving the problems of miniaturization and screen ratio in existing image stabilization designs, and achieving a larger field of view and a higher screen ratio.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- AAC MICROTECH (CHANGZHOU) CO LTD
- Filing Date
- 2025-01-21
- Publication Date
- 2026-07-30
AI Technical Summary
The existing image stabilization design of AR glasses cameras is limited by size and weight, making it difficult to achieve small-sized image stabilization designs. In addition, conventional moving lens solutions affect the screen ratio and device miniaturization.
The design adopts a mobile sensor assembly, in which the sensor assembly is suspended in the housing space by an elastic support. The drive coil and magnetic circuit system work together to enable the sensor to move along the optical axis, avoiding the need for additional space for lens movement.
It achieves an increased screen-to-body ratio without increasing the lens screen opening size, and increases the field of view by adjusting the optical axis direction, thus optimizing the image stabilization effect.
Smart Images
Figure CN2025073516_30072026_PF_FP_ABST
Abstract
Description
A sensor driving device and lens module Technical Field
[0001] The embodiments disclosed herein belong to the field of imaging equipment technology, 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 disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a sensor driving device and a lens module.
[0006] A first aspect of the embodiments of this disclosure 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 driving assembly is disposed within the receiving space. The driving assembly includes a coil bracket fixed to the side of the circuit board near the light-transmitting hole, a magnetic circuit system fixed to the inner side of the upper cover, and a driving coil fixed to the outer side of the coil bracket.
[0010] An elastic support is disposed within the receiving space and connected between the circuit board and the base plate. The elastic support includes a first connecting portion fixed to the base plate, a second connecting portion fixed to the circuit board, and an elastic lever arm connecting the first connecting portion and the second connecting portion. The elastic support suspends the sensor assembly within the receiving space.
[0011] The drive coil is disposed opposite to the magnetic circuit system, and the drive coil cooperates with the magnetic circuit system to drive the sensor assembly to move along the optical axis of the lens.
[0012] Optionally, the drive coil includes an upper coil portion near the light-transmitting hole and a lower coil portion near the circuit board.
[0013] Optionally, the magnetic circuit system includes a first magnetic group and a second magnetic group respectively fixed to two opposite sidewalls of the upper cover. The first magnetic group includes a first magnet and a second magnet stacked in a direction parallel to the optical axis, with the magnetic poles of the first magnet and the second magnet having opposite directions. The second magnetic group includes a third magnet and a fourth magnet stacked in a direction parallel to the optical axis, with the magnetic poles of the third magnet and the fourth magnet having opposite directions. The upper coil portion is disposed opposite to the first magnet and the third magnet, and the lower coil portion is disposed opposite to the second magnet and the fourth magnet.
[0014] Optionally, the first magnet and the second magnet are integrally formed using a four-pole magnetization process; the third magnet and the fourth magnet are integrally formed using a four-pole magnetization process.
[0015] Optionally, the magnetic circuit system includes a first magnetic group and a second magnetic group respectively fixed to two opposite sidewalls of the upper cover, and both the first magnetic group and the second magnetic group are integrally formed using the Heilbeck process.
[0016] Optionally, the coil support is provided with an annular mounting groove on the side facing the magnetic circuit system, and the drive coil is arranged in the annular mounting groove.
[0017] Optionally, 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.
[0018] Optionally, the elastic support includes a plurality of elastic lever arms, which are arranged symmetrically with respect to the elastic support at a rotational center.
[0019] Optionally, the first connecting part is frame-shaped; the elastic lever arm and the second connecting part are both disposed on the outer periphery of the first connecting part, and the elastic lever arm is connected to the outer frame edge of the first connecting part.
[0020] Optionally, the base plate is provided with a clearance section to allow the elastic lever arm to pass through.
[0021] Optionally, there are two second connecting parts that are spaced apart from each other. Each second connecting part is fixedly connected to the circuit board. 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.
[0022] Optionally, the first connecting part is frame-shaped; the elastic lever arm and the second connecting part are both disposed on the inner periphery of the first connecting part, and the elastic lever arm is connected to the inner frame edge of the first connecting part.
[0023] Optionally, four second connecting parts are provided around the inner circumference of the first connecting part, each of the second connecting parts being fixedly connected to the circuit board, and the four second connecting parts are respectively connected to four different elastic lever arms.
[0024] Furthermore, it also includes: a connecting post disposed on the base plate, a connecting protrusion extending from the coil support toward the circuit board, and an elastic member connecting the connecting protrusion and the connecting post.
[0025] A second aspect of the embodiments of this disclosure provides a lens module, comprising:
[0026] The sensor driving device described above;
[0027] A sensor assembly is disposed within the housing and is connected to the elastic support member;
[0028] The lens is inserted into a through-hole at the top of the housing to be suspended within the receiving space.
[0029] Optionally, the lens includes a lens barrel and a lens group; the lens barrel has a receiving space for accommodating the lens group and a suspension structure; the lens barrel is inserted into a light-transmitting hole at the top of the housing through the suspension structure.
[0030] The beneficial effects of the embodiments of this disclosure include:
[0031] In this invention, the fixed-focus image stabilization design employing a moving sensor assembly eliminates the need for additional space for the lens assembly to move. Furthermore, the lens portion is partially inserted into the housing's accommodating space, allowing for further control of the lens module's structural dimensions. The drive assembly positioned between the lens's outer wall and the housing's inner wall effectively utilizes the housing's internal space, thus avoiding the need to increase the lens's screen aperture size and effectively improving the screen-to-body ratio. Additionally, compared to existing lens movement solutions, this invention's sensor assembly movement solution allows for direct movement along the optical axis, enabling adjustment of the optical axis direction and achieving a larger field of view (FOV) with the same screen aperture size. Attached Figure Description
[0032] Figure 1 is a schematic diagram of the structure of a lens module according to an embodiment of the present invention;
[0033] 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.
[0034] Figure 3 is a partially enlarged schematic diagram of the structure shown in Figure 2;
[0035] Figure 4 is a three-dimensional exploded view of the lens module shown in Figure 1;
[0036] Figure 5 is a schematic diagram of the overall structure of the base plate, elastic support member and drive assembly in one embodiment of the present invention.
[0037] Figure 6 is a partially enlarged schematic diagram of the structure shown in region A of Figure 5;
[0038] Figure 7 is a partially enlarged schematic diagram of the structure shown in region B of Figure 5;
[0039] Figure 8 is an exploded perspective view of a driving component according to an embodiment of the present invention;
[0040] Figure 9 is a schematic diagram of the overall structure of an elastic support member according to an embodiment of the present invention;
[0041] Figure 10 is a partially enlarged schematic diagram of the structure shown in Figure 9;
[0042] Figure 11 is a schematic diagram of the overall structure of the elastic support member according to another embodiment of the present invention;
[0043] Figure 12 is a cross-sectional view of the lens module shown in Figure 1 along the AA direction in another embodiment of the present invention, which shows the positional relationship between the sensor driving device, the sensor assembly and the lens.
[0044] Figure 13 is a partially enlarged schematic diagram of the structure shown in Figure 12;
[0045] Figure 14 is a schematic diagram of the overall structure of an elastic support member according to an embodiment of the present invention;
[0046] Figure 15 is a partially enlarged schematic diagram of the structure shown in Figure 14;
[0047] Figure 16 is a schematic diagram of the overall structure of an elastic support member according to an embodiment of the present invention;
[0048] Figure 17 is a cross-sectional view of a magnetic circuit system according to an embodiment of the present invention; the figure shows a first magnet, a second magnet, a third magnet and a fourth magnet made using a four-pole magnetization process, and the magnetic poles of the first magnet, the second magnet, the third magnet and the fourth magnet are shown, wherein the arrows point from the S pole to the N pole.
[0049] Figure 18 is a schematic diagram of the overall structure of the elastic element according to an embodiment of the present invention;
[0050] Figure 19 is a cross-sectional view of a magnetic circuit system according to an embodiment of the present invention; the figure shows the first and second magnetic groups manufactured using the Hellbeck process, and illustrates the magnetic poles of the first, second, third, and fourth magnets, wherein the arrows point from the S pole to the N pole.
[0051] Figure 20 is an exploded perspective view of the sensor assembly shown in Figure 4.
[0052] In the diagram, 100 is the lens module; 10 is the sensor driving device; 20 is the sensor assembly; 30 is the lens; 11 is the housing; 12 is the elastic support; 13 is the driving assembly; 14 is the connecting post; 15 is the connecting protrusion; 16 is the elastic element; 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; 1121 is the clearance part; 1231 is the first lever arm; 1232 is the second lever arm; 1233 is the third lever arm; and 131 is the magnetic circuit system. 132. Drive coil; 133. Coil bracket; 1312. First magnetic group; 1313. Second magnetic group; 13121. First magnet; 13122. Second magnet; 1321. Upper coil part; 1322. Lower coil part; 13131. Third magnet; 13132. Fourth magnet; 1331. Mounting groove; 1332. Positioning protrusion; 21. Circuit board; 22. Sensor; 23. Sensor bracket; 24. Filter; 31. Optical axis; 32. Lens barrel; 33. Lens group; 231. Mounting cavity; 321. Accommodation space; 322. Suspension structure. Detailed Implementation
[0053] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0054] 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.
[0055] 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.
[0056] As shown in Figures 1-4, a sensor driving device 10 includes a housing 11, a sensor assembly 20, an elastic support member 12, and a driving assembly 13. 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 the lens 30.
[0057] The sensor assembly 20 is disposed within the housing space 111. The sensor assembly 20 includes a circuit board 21 and a sensor 22 disposed on the side of the circuit board 21 near the light-transmitting hole 113 and electrically connected to the circuit board 21.
[0058] The drive assembly 13 is disposed in the receiving space 111. The drive assembly 13 includes a coil bracket 133 fixed to the side of the circuit board 21 near the light-transmitting hole 113, a magnetic circuit system 131 fixed to the inside of the top cover 115, and a drive coil 132 fixed to the outside of the coil bracket 133.
[0059] The elastic support 12 is disposed in the receiving space 111 and is connected between the circuit board 21 and the base plate 112. The elastic support 12 includes a first connecting part 121 fixed to the base plate 112, a second connecting part 122 fixed to the circuit board 21, 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.
[0060] The drive coil 132 is disposed opposite to the magnetic circuit system 131, and the drive coil 132 cooperates with the magnetic circuit system 131 to drive the sensor assembly 20 to move along the optical axis of the lens.
[0061] In this invention, the fixed-focus image stabilization design using the moving sensor assembly 20 eliminates the need for additional space to move the lens 30. Furthermore, since a portion of the lens 30 is inserted into the receiving space 111 of the housing 11, the structural dimensions of the lens module 100 can be further controlled. The drive assembly 13, positioned between the outer wall of the lens 30 and the inner wall of the housing 11, effectively utilizes the space within the housing 11, thus eliminating the need to increase the screen aperture size of the lens 30 and effectively improving the screen-to-body ratio. Additionally, compared to existing lens movement solutions, the sensor assembly 20 movement solution in this invention allows for direct movement along the optical axis 31, enabling adjustment of the optical axis 31 direction and achieving a larger field of view (FOV) with the same screen aperture size.
[0062] Furthermore, the axes of the light-transmitting hole 113 at the top and the bottom through hole 114 at the bottom of the housing 11 coincide 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 support of the elastic support member 12 and corresponds to the position of the lens 30.
[0063] Referring to Figures 4-8, in some embodiments, the drive coil 132 includes an upper coil portion 1321 near the light-transmitting hole 113 and a lower coil portion 1322 near the circuit board 21.
[0064] In some embodiments, the upper coil portion 1321 and the lower coil portion 1322 are integrally formed.
[0065] In some embodiments, the magnetic circuit system 131 includes a first magnetic assembly 1312 and a second magnetic assembly 1313 respectively fixed to two opposite sidewalls of the upper cover 115. The first magnetic assembly 1312 includes a first magnet 13121 and a second magnet 13122 stacked along a direction parallel to the optical axis 31, with the magnetic poles of the first magnet 13121 and the second magnet 13122 having opposite directions (see Figure 17 for details). The second magnetic assembly 1313 includes a third magnet 13131 and a fourth magnet 13132 stacked along a direction parallel to the optical axis 31, with the magnetic poles of the third magnet 13131 and the fourth magnet 13132 having opposite directions (see Figure 17 for details). The upper coil portion 1321 is disposed opposite to the first magnet 13121 and the third magnet 13132, and the lower coil portion 1322 is disposed opposite to the second magnet 13122 and the fourth magnet 13132.
[0066] In one embodiment of the present invention, the first magnet 13121, the second magnet 13122, the third magnet 13131, and the fourth magnet 13132 are all strip-shaped and are all fixed to the inner sidewall of the housing 11. The magnetic poles of the first magnet 13121 and the third magnet 13131 point towards the optical axis 31 of the lens 30, while the magnetic poles of the second magnet 13122 and the fourth magnet 13132 point away from the optical axis 31 of the lens 30.
[0067] Referring to Figure 17, in some embodiments, the first magnet 13121 and the second magnet 13122 are integrally formed using a quadrupole magnetization process. Specifically, along the direction pointing towards the optical axis 31, the end face of the first magnet 13121 facing the optical axis 31 is set as the N pole, and the end face of the first magnet 13121 away from the optical axis 31 is set as the S pole. The end face of the second magnet 13122 facing the optical axis 31 is set as the S pole, and the end face of the second magnet 13122 away from the optical axis 31 is set as the N pole. The first magnet 13121 and the second magnet 13122 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 132 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.
[0068] In some embodiments, the third magnet 13131 and the fourth magnet 13132 are integrally formed using a quadrupole magnetization process. Specifically, along the direction pointing towards the optical axis 31, the end face of the third magnet 13131 facing the optical axis 31 is designated as the N pole, and the end face of the third magnet 13131 away from the optical axis 31 is designated as the S pole. The end face of the fourth magnet 13132 facing the optical axis 31 is designated as the S pole, and the end face of the fourth magnet 13132 away from the optical axis 31 is designated as the N pole. The third magnet 13131 and the fourth magnet 13132 are integrally formed using a quadrupole magnetization process.
[0069] Referring to Figure 19, in some embodiments, the magnetic circuit system 131 includes a first magnetic group 1312 and a second magnetic group 1313 respectively fixed to two opposite sidewalls of the upper cover 115. Both the first magnetic group 1312 and the second magnetic group 1313 are integrally formed using a Hellbeck process. It is understood that the magnetic pole arrangement of the first magnetic group 1312 and the second magnetic group 1313 can be configured according to a four-pole magnetization process and integrally formed using a Hellbeck process. The magnetic pole arrangement between the first magnet 13121 and the second magnet 13122, and between the third magnet 13131 and the fourth magnet 13132, are shown in Figure 19. In the magnet arrangement of the Hellbeck array, the magnetization directions of adjacent magnets rotate according to a specific pattern, resulting in a significantly enhanced magnetic field on one side and almost zero on the other. By designing the arrangement and magnetization direction of the magnets, the Hellbeck array can generate a highly concentrated and uniform magnetic field in a specific area, while reducing or eliminating unwanted magnetic field areas.
[0070] In this invention, the first magnetic assembly 1312 and the second magnetic assembly 1313 are fabricated using the Helbeck process. This allows the magnetic assemblies to generate a very strong and uniform magnetic field on one side, while having almost no magnetic field on the other side. This characteristic is ideal for applications requiring a strong unidirectional magnetic field. By adjusting the number and arrangement of the magnets, different magnetic field distributions with varying pole numbers can be achieved, such as four-pole or six-pole arrays, to meet diverse application needs. Compared to traditional magnet arrangements, the Helbeck array utilizes magnetic materials more effectively, reduces magnetic losses, and improves magnetic field utilization.
[0071] The first specific embodiment of the present invention includes: a first magnet 13121 and a second magnet 13122 are each manufactured using a separate, separate magnetic circuit design, and the first magnet 13121 and the second magnet 13122 are assembled to form a first magnetic group 1312. A third magnet 13131 and a fourth magnet 13132 are each manufactured using a separate, separate magnetic circuit design, and the third magnet 13131 and the fourth magnet 13132 are assembled to form a second magnetic group 1313.
[0072] The second specific embodiment provided by the present invention includes: the first magnetic group 1312 and the second magnetic group 1313 are integrally formed by a four-pole magnetization process, and the first magnetic group 1312 and the second magnetic group 1313 are assembled to form a magnetic circuit system 131.
[0073] The third specific embodiment provided by the present invention includes: the first magnetic group 1312 and the second magnetic group 1313 are integrally formed using a Heilbeck process, and the first magnetic group 1312 and the second magnetic group 1313 are assembled to form a magnetic circuit system 131.
[0074] In some embodiments, specifically referring to FIG8, the coil support 133 has an annular mounting groove 1331 on the side facing the magnetic circuit system 131, and the drive coil 132 is arranged in the annular mounting groove 1331. Specifically, the drive coil 132 is annular, and the shape of the mounting groove 1331 is adapted to the shape of the drive coil 132. A positioning protrusion 1332 is provided within the mounting groove 1331. The drive coil 132 is fitted onto the positioning protrusion 1332, thus circumferentially positioned within the mounting groove 1331.
[0075] Referring to Figures 9-11, in one embodiment, both the first connecting portion 121 and the second connecting portion 122 are sheet-like.
[0076] 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 extending from the first lever arm 1231 by bending, and a third lever arm 1233 extending from the 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.
[0077] In some embodiments, the first lever arm 1231 and the third lever arm 1233 are arranged parallel to each other.
[0078] Referring to Figures 14 and 16, in some embodiments, the elastic support 12 includes a plurality of elastic lever arms 123, which are arranged symmetrically with respect to the elastic support 12 at a rotational center.
[0079] In one embodiment of the present invention, referring again to Figures 9-11, the first connecting portion 121 is frame-shaped, and both the elastic arm 123 and the second connecting portion 122 are disposed on the outer periphery of the first connecting portion 121. The elastic arm 123 is connected to the outer frame edge of the first connecting portion 121. Further, the base plate 112 is provided with a clearance portion 1121 (refer to Figure 7) to allow the elastic arm 123 to pass through. Specifically, the clearance portion 1121 is recessed on the surface of the base plate 112 facing the circuit board 21, and the position of the clearance portion 1121 corresponds to the position of the elastic arm 123. Along the optical axis 31, the elastic arm 123 has a certain travel distance within the clearance portion 1121.
[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 circuit board 21. The two second connecting parts 122 are respectively connected to two different elastic arms 123, and the extension directions of the third arms 1233 of the two elastic arms 123 are opposite.
[0081] In other embodiments, referring to Figures 12-16, the first connecting portion 121 is frame-shaped, and the elastic lever arm 123 and the second connecting portion 122 are both disposed on the inner periphery of the first connecting portion 121. The elastic lever arm 123 is connected to the inner frame edge of the first connecting portion 121.
[0082] In some embodiments, four second connecting portions 122 are provided around the inner circumference of the first connecting portion 121. Each second connecting portion 122 is fixedly connected to the circuit board 21, and the four second connecting portions 122 are respectively connected to four different elastic arms 123. Specifically, the four elastic arms 123 are arranged symmetrically with respect to the first connecting portion 121 at a rotational center.
[0083] In some embodiments, specifically referring to Figures 5-6, the sensor driving device 10 further includes a connecting post 14 disposed on the base plate 112, a connecting protrusion 15 extending from the coil support 133 toward the circuit board 21, and an elastic member 16 connecting the connecting protrusion 15 and the connecting post 14.
[0084] In some embodiments, referring again to Figures 5-6, the base plate 112 is rectangular, and there are two connecting posts 14 arranged diagonally. One end of the connecting post 14 is fixedly connected to the surface of the base plate 112 facing the circuit board 21, and the other end of the connecting post 14 is connected to the elastic member 16.
[0085] In other embodiments, the base plate 112 is rectangular, and there are two connecting posts 14 arranged diagonally. One end of the connecting post 14 is fixedly connected to the surface of the first connecting part 121 facing the circuit board 21, and the other end of the connecting post 14 is connected to the elastic member 16.
[0086] Referring to FIG18, in some embodiments, the elastic member 16 includes a first connector 161 fixedly connected to the connecting post 14, a second connector 162 fixedly connected to the connecting protrusion 15, and a bending elastic member 163 connecting the first connector 161 and the second connector 162.
[0087] In this invention, by arranging the connecting columns 14 diagonally and connecting them with elastic elements 16, 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 163 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.
[0088] In one specific embodiment of the present invention, the elastic lever arm 123 is U-shaped. The drive coil 132 is directly electrically connected to the circuit board 21. It is understood that the shape of the elastic lever arm 123 may include, but is not limited to, a U-shape, or other specific shapes.
[0089] In other embodiments, the drive coil 132 is electrically connected to the circuit board 21 via an elastic member 16. The drive coil 132, mounted within the coil support 133, generates a magnetic field based on the current and interacts with the magnetic field of the magnetic circuit system 131 to drive the sensor assembly 20 to move along the optical axis 31.
[0090] In another specific embodiment provided by the present invention, the second lever arm 1232 is Z-shaped.
[0091] In some embodiments, a flexible circuit board is printed on the elastic element 16 so that the elastic element 16 can conduct current from the sensor assembly 20 to the drive coil 132.
[0092] Referring to Figures 1-3, 12-13, and 20, a second aspect of the embodiments of this disclosure provides a lens module 100, including a sensor driving device 10, a sensor assembly 20, and a lens 30. The sensor assembly 20 is disposed within a housing 11 and connected to an elastic support member 12. The lens 30 is inserted into a light-transmitting hole 113 at the top of the housing 11 to be suspended within a receiving space 111.
[0093] In some embodiments, the lens 30 includes a lens barrel 32 and a lens group 33. The lens barrel 32 has a receiving space 321 for accommodating the lens group 33 and a suspension structure 322. The lens barrel 32 is inserted into a light-transmitting hole 113 at the top of the housing 11 through the suspension structure 322.
[0094] In a specific embodiment of the present invention, the suspension structure 322 is annular and is arranged around the periphery of the lens barrel 32 and is used to abut against the top wall of the housing 11 to suspend the lens 30 in the receiving space 111 of the housing 11.
[0095] Specifically, the sensor driving device 10 has a housing 11, a sensor assembly 20 disposed inside the housing 11, the sensor assembly 20 being connected to the elastic support member 12, and a lens 30 disposed at the light-transmitting hole 113 at the top of the housing 11. The lens 30 and the sensor assembly 20 are correspondingly disposed, wherein the lens 30 is disposed at the light-transmitting hole 113, along the optical axis 31 of the lens 30, the lens 30 and the sensor assembly 20 are disposed sequentially, and the sensor driving device 10 is disposed around the lens 30 for driving the sensor assembly 20 to move along the optical axis 31 of the lens 30.
[0096] More specifically, the current generated by the sensor assembly 20 is conducted to the drive coil 132 of the sensor drive device 10 through the elastic element 16, or the current generated by the sensor assembly 20 is directly conducted to the drive coil 132 through the circuit board 21. When there is current in the drive coil 132, the force generated by the interaction between the magnetic field of the drive coil 132 and the magnetic field of the magnetic circuit system 131 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.
[0097] In this invention, the fixed-focus image stabilization design using the moving sensor assembly 20 eliminates the need for additional space to move the lens 30 assembly. Furthermore, since a portion of the lens 30 is inserted into the receiving space 321 of the housing 11, the structural dimensions of the lens module 100 can be further controlled. The drive assembly 13, positioned between the outer wall of the lens 30 and the inner wall of the housing 11, effectively utilizes the space within the housing 11, thus eliminating the need to increase the screen opening size of the lens 30 and effectively improving the screen-to-body ratio. Additionally, compared to existing lens 30 moving solutions, the sensor assembly 20 moving solution in this invention allows for direct movement along the optical axis 31, enabling adjustment of the optical axis 31 direction and achieving a larger field of view (FOV) with the same screen opening size.
[0098] Referring again to Figure 19, 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 cavity 231 that is adapted to the shape of the filter 24, and the filter 24 is disposed in the mounting cavity 231.
[0099] A third aspect of the present invention provides AR glasses, the AR glasses including the lens module 100 described above.
[0100] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.
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 driving assembly is disposed within the receiving space. The driving assembly includes a coil bracket fixed to the side of the circuit board near the light-transmitting hole, a magnetic circuit system fixed to the inner side of the upper cover, and a driving coil fixed to the outer side of the coil bracket. An elastic support is disposed within the receiving space and connected between the circuit board and the base plate. The elastic support includes a first connecting portion fixed to the base plate, a second connecting portion fixed to the circuit board, and an elastic lever arm connecting the first connecting portion and the second connecting portion. The elastic support suspends the sensor assembly within the receiving space. The drive coil is disposed opposite to the magnetic circuit system, and 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 drive coil includes an upper coil portion near the light-transmitting hole and a lower coil portion near the circuit board.
3. The sensor driving device according to claim 2, characterized in that, The magnetic circuit system includes a first magnetic group and a second magnetic group fixed to two opposite sidewalls of the upper cover. The first magnetic group includes a first magnet and a second magnet stacked in a direction parallel to the optical axis, with the magnetic poles of the first magnet and the second magnet having opposite directions. The second magnetic group includes a third magnet and a fourth magnet stacked in a direction parallel to the optical axis, with the magnetic poles of the third magnet and the fourth magnet having opposite directions. The upper coil portion is disposed opposite to the first magnet and the third magnet, and the lower coil portion is disposed opposite to the second magnet and the fourth magnet.
4. A sensor driving device according to claim 3, characterized in that, The first magnet and the second magnet are integrally formed using a four-pole magnetization process; the third magnet and the fourth magnet are integrally formed using a four-pole magnetization process.
5. A sensor driving device according to claim 2, characterized in that, The magnetic circuit system includes a first magnetic group and a second magnetic group, which are respectively fixed to two opposite sidewalls of the upper cover. Both the first magnetic group and the second magnetic group are integrally formed using the Heilbeck process.
6. A sensor driving device according to claim 2, characterized in that, The coil support has an annular mounting groove on the side facing the magnetic circuit system, and the drive coil is arranged in the annular mounting groove.
7. A sensor driving device according to claim 1, characterized in that, The elastic lever arm includes a first lever arm connected to the first connecting portion, a second lever arm that bends and extends from the first lever arm, and a third lever arm that extends 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.
8. A sensor driving device according to claim 1, characterized in that, The elastic support includes a plurality of elastic lever arms, which are arranged symmetrically with respect to the elastic support at a rotational center.
9. A sensor driving device according to claim 7, characterized in that, The first connecting part is frame-shaped; the elastic lever arm and the second connecting part are both disposed on the outer periphery of the first connecting part, and the elastic lever arm is connected to the outer frame edge of the first connecting part.
10. A sensor driving device according to claim 9, characterized in that, The base plate is provided with a clearance section to allow the elastic lever arm to pass through.
11. 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 circuit board. The two second connecting parts are respectively connected to two different elastic arms, and the extension directions of the third arms of the two elastic arms are opposite.
12. A sensor driving device according to claim 8, characterized in that, The first connecting part is frame-shaped; the elastic lever arm and the second connecting part are both disposed on the inner periphery of the first connecting part, and the elastic lever arm is connected to the inner frame edge of the first connecting part.
13. A sensor driving device according to claim 12, characterized in that, Four second connecting parts are provided around the inner circumference of the first connecting part, each of the second connecting parts is fixedly connected to the circuit board, and the four second connecting parts are respectively connected to four different elastic lever arms.
14. The sensor driving device according to claim 1, characterized in that, Also includes: A connecting post disposed on the base plate, a connecting protrusion extending from the coil support toward the circuit board, and an elastic member connecting the connecting protrusion and the connecting post.
15. A lens module, characterized in that, include: The sensor driving device according to any one of claims 1-14; A sensor assembly is disposed within the housing and is connected to the elastic support member; The lens is inserted into a through-hole at the top of the housing to be suspended within the receiving space.
16. A lens module according to claim 15, characterized in that, The lens includes a lens barrel and a lens group; the lens barrel has a receiving space for accommodating the lens group and a suspension structure; the lens barrel is inserted into a light-transmitting hole at the top of the housing through the suspension structure.