Adjustable image sensor unit, camera module and calibration system thereof

Abstract

The invention provides an adjustable image sensor unit, a camera module with the adjustable image sensor unit, and a calibration system of the camera module. The adjustable image sensor unit at least comprises a supporting seat, a first elastic assembly, a second elastic assembly, an axial adjusting assembly, an image sensor assembly and a translation adjusting assembly. The image sensor assembly is suspended on the supporting seat through the first elastic assembly; the translation adjusting assembly is connected with the supporting seat; the second elastic component is connected with the supporting seat; the axial adjusting assembly is connected with the image sensor assembly and used for driving the image sensor assembly to move relative to the optical axis of the camera module and incline relative to the optical axis. According to the invention, the axial adjusting assembly and the translation adjusting assembly which are built in the camera module are adopted to replace the existing AA equipment to adjust the position and inclination of the lens and the light-sensitive surface of the image sensor assembly, the structure is simple, and the use cost is low; the corresponding calibration system has low requirements on hardware and is simple and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of camera modules, and in particular to an adjustable image sensor unit, a camera module having the adjustable image sensor unit, and a calibration system for the camera module. Background Art

[0002] Camera modules are generally used in electronic devices with shooting functions to capture images or videos. Camera modules generally include an anti-shake drive unit, a focus drive unit, a chip, and a lens. The anti-shake drive unit is used to drive the lens or chip to move in a plane perpendicular to the optical axis of the camera module, so that the position between the lens and the chip changes, thereby achieving lens shake compensation and further achieving camera module anti-shake. The focus drive unit drives the lens or chip to move along the optical axis of the camera module, so that the relative position between the lens and the chip changes, thereby achieving camera module focus.

[0003] Resolution is a core technical indicator of the camera module, and the tilt between the lens and the chip is the main factor that leads to reduced camera resolution. In the production process of camera modules, in order to strictly control the tilt, AA (Active Alignment) equipment is usually used to adjust the tilt. The AA device clamps the lens and moves it along the optical axis of the lens and the photosensitive center of the photosensitive chip to defocus, determine the tilt between the lens and the chip, and then adjust the lens movement on the X, Y, and Z axes to make the optical axis of the lens and the photosensitive surface of the chip perpendicular. AA equipment can correct the tilt well, but AA equipment has the disadvantages of being expensive and bulky.

[0004] However, it is necessary to provide a small-sized, low-cost technical solution that can adjust the relative position and angle between the lens optical axis and the chip imaging surface. Summary of the invention

[0005] The present invention provides an adjustable image sensor unit and a camera module having the adjustable image sensor unit, which can adjust the relative position and angle between the lens optical axis and the chip imaging surface, and has a simple structure, small hardware volume, and low manufacturing cost compared to the prior art. The present invention also provides a camera module calibration system for calibrating the camera module, which has lower hardware requirements and is easy to operate compared to the prior art.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An adjustable image sensor unit is applied to a camera module, the adjustable image sensor unit comprises a support base, a first elastic component, a second elastic component, an axial adjustment component, an image sensor component and a translation adjustment component; the image sensor component is suspended on the support base through the first elastic component; the translation adjustment component is connected to the support base, and is used to drive the support base to move in a plane perpendicular to the optical axis of the camera module; the second elastic component is connected to the support base, and is used to drive the support base to return to its original position through elastic force after the support base moves in a plane perpendicular to the optical axis; the axial adjustment component is connected to the image sensor component, and is used to drive the image sensor component to move along the optical axis and tilt relative to the optical axis; the first elastic component is used to drive the image sensor component to return to its original position relative to the support base through elastic force after the image sensor component tilts relative to the optical axis.

[0008] In one embodiment, the axial adjustment component includes a bracket, a first coil and a magnetic component; the bracket includes a frame portion surrounding the periphery of the image sensor component, and the frame portion is spaced apart from the image sensor component; the magnetic component is fixed to the frame portion, and the first coil is fixed to the image sensor component and is opposite to the magnetic component. After the first coil is energized, the interaction force generated by the first coil and the magnetic component drives the image sensor component to tilt relative to the support base.

[0009] In one embodiment, there are four magnetic components, which are arranged at equal intervals around the image sensor assembly; the number of magnetic components is the same as the number of first coils; and the positions of each magnetic component and each first coil correspond one by one.

[0010] In one embodiment, the translation adjustment assembly includes four second coils, which are fixedly positioned and evenly spaced around the periphery of the frame portion; the four second coils are spaced from the frame portion; and each second coil corresponds to the position of each magnetic component one by one.

[0011] In one embodiment, the bracket further includes a cover portion extending inwardly from the top side of the frame portion in a direction perpendicular to the optical axis of the camera module; the support seat is slidably abutted against the bottom wall of the cover portion through a sliding structure;

[0012] The support seat includes a bottom frame and four support columns extending upward from the top wall of the bottom frame; the four support columns are arranged in a rectangular shape; the sliding structure includes four grooves respectively opened on the top surfaces of the support columns, each groove is provided with at least one ball; the upper side of the ball is exposed above the corresponding groove and abuts against the cover plate.

[0013] In one embodiment, the image sensor assembly is located between four supporting columns; the first elastic assembly includes four elastic sheets, one end of the four elastic sheets is respectively fixed to the four supporting columns; the other ends of the four elastic sheets are fixed to the image sensor assembly.

[0014] In one embodiment, the image sensor assembly includes a carrier frame, a chip carrier board arranged on the carrier frame, and a chip arranged on the chip carrier board; the carrier frame is fixedly connected to the elastic sheet, and the carrier frame is suspended between four support columns by four elastic sheets.

[0015] In one embodiment, the second elastic component includes an elastic circuit board; the elastic circuit board includes an inner frame, an intermediate frame spaced around the periphery of the inner frame, and an outer frame spaced around the periphery of the intermediate frame; the inner frame is suspendedly connected to the intermediate frame via an elastic cantilever; the intermediate frame is suspendedly connected to the outer frame via an elastic structure; the frame portion is fixedly connected to the outer frame; the support base is fixedly connected to the intermediate frame; and the image sensor assembly is fixedly connected to the inner frame.

[0016] A camera module comprises a shell, a lens, a focus drive and the above-mentioned adjustable image sensor unit, wherein a support seat, a first elastic component, a second elastic component, an axial adjustment component, an image sensor component and a translation adjustment component are all arranged inside the shell; the translation adjustment component is fixed to the inner wall of the shell; the shell comprises an assembly hole connected to the inner cavity of the shell, and the position of the assembly hole corresponds to the position of the image sensor component; the lens is arranged in the assembly hole; the focus drive connects the lens and the shell to drive the lens to move along the optical axis of the camera module.

[0017] A camera module calibration system is used to calibrate the above-mentioned camera module, and the camera module calibration system includes: a test component, which is used for the camera module to shoot a test image; a control unit, which is used to connect with the camera module and control the camera module to shoot the test component, obtain the resolution change curve of the camera module during the shooting process, control the axial adjustment component to adjust the position and tilt of the image sensor component relative to the lens according to the resolution change curve, so that the image sensor component reaches an optimal sensing position and alignment state relative to the lens, and record and store the position data of the adjusted image sensor component and the lens.

[0018] The beneficial effects of this application are:

[0019] The adjustable image sensor unit, camera module and smart wearable device provided by the present application use an axial adjustment component and a translation adjustment component built into the camera module to replace the traditional AA device to adjust the relative position and angle of the image sensor component and the lens, which has the advantages of smaller required hardware volume, simpler structure and low use cost. In addition, the use of the axial adjustment component and the translation adjustment component can also be used to adjust the image sensor component to a special posture to sense the optical signal collected by the lens, thereby generating a special photosensitive signal and obtaining a special image effect, such as obtaining a fantasy effect of deformation and distortion of the picture. The camera module calibration system provided by the present application also does not need to use an AA device, but can adjust the relative position of the image sensor component and the lens through the axial adjustment component built into the camera module 130, thereby reducing the hardware requirements for calibrating the camera module, simplifying the calibration operation process, and helping to reduce manufacturing costs and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but should not constitute a limitation of the present invention.

[0021] Figure 1 Schematic diagram of the overall structure of the camera module according to an embodiment of the present invention;

[0022] Figure 2 is a schematic cross-sectional structure diagram of a camera module according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the combined structure of a camera module according to an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a partial structure of a support base according to an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the elastic circuit board according to an embodiment of the present invention.

[0026] Figure 6 It is a schematic diagram of the hardware environment when the camera module calibration system of an embodiment of the present invention is used to calibrate the camera module.

[0027] Figure 7 is through Figure 6 The schematic diagram shown is a schematic diagram of the change in alignment state of the lens and image sensor assembly in the camera module before and after adjustment of the camera module calibration system.

[0028] Notes on the attached drawings:

[0029] 10. A second elastic component;

[0030] 11. outer frame; 12. middle frame; 13. inner frame; 14. elastic cantilever; 15. elastic structure; 151. first connecting block; 152. second connecting block; 153. elastic frame; 154. connecting piece;

[0031] 20. housing; 21. bottom plate; 22. mounting plate;

[0032] 30. bracket; 31. cover plate portion; 32. frame portion; 321. assembly window;

[0033] 40. Image sensor assembly; 41. Chip carrier plate; 42. Carrier frame; 43. Chip;

[0034] 51. first coil; 52. magnetic member; 53. second coil;

[0035] 60. Support seat; 61. Support column;

[0036] 70. Sliding structure; 71. Ball bearing; 72. Groove;

[0037] 80. a first elastic component;

[0038] 100, lens; 101, focus drive member; 102, optical axis;

[0039] 110. control unit; 111. drive module; 112. controller;

[0040] 120. Test components;

[0041] 130. Camera module. DETAILED DESCRIPTION

[0042] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0043] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the first aspect of the present application provides a camera module 130, including a lens 100, a housing 20, an adjustable image sensor unit, and a focus driving member 101. The bottom port of the housing 20 is open, and the bottom port of the housing 20 is provided with a bottom plate 21, and the bottom plate 21 can close the bottom port of the housing 20, thereby forming a relatively closed inner cavity in the housing 20. The adjustable image sensor unit is arranged in the inner cavity of the housing 20.

[0044] The top surface of the shell 20 also includes an assembly hole connected to the inner cavity. The focus drive member 101 can be a voice coil motor, which is arranged on the top surface of the shell 20 and corresponds to the position of the assembly hole. The lens 100 is assembled in the shell 20, exposed from the assembly hole and connected to the voice coil motor. The voice coil motor drives the lens 100 to move up and down along the optical axis direction of the camera module 130, thereby changing the distance between the lens 100 and the photosensitive component of the adjustable image sensor unit to complete the focus of the camera module 130. It should be understood that the optical axis of the camera module 130 is also the optical axis of the lens 100; the abbreviation "optical axis" mentioned below refers to the optical axis of the camera module 130, which is also the optical axis of the lens 100 unless otherwise specified.

[0045] In this embodiment, the optical axis direction of the camera module 130 is parallel to the Z axis. The external light passes through the lens 100 from top to bottom along the Z axis and finally reaches the adjustable image sensor unit, causing the photosensitive component on the adjustable image sensor unit to generate a corresponding image signal, thereby finally forming an image of the camera module 130.

[0046] In this embodiment, the adjustable image sensor unit includes an image sensor assembly 40, a first elastic assembly 80, a second elastic assembly 10, a support seat 60, a bracket 30, a first coil 51, a magnet component 52, a second coil 53, and a mounting plate 22. The bracket 30, the first coil 51, and the magnet component 52 together constitute an axial adjustment assembly, which is used to adjust the distance between the image sensor assembly 40 and the lens 100 in the direction of the optical axis and the angle of the image sensor assembly 40 relative to the direction of the optical axis. The magnet component 52, the second coil 53, and the mounting plate 22 together constitute a translation adjustment assembly, which is used to drive the image sensor assembly 40 to move in a direction perpendicular to the optical axis. It can be understood that the axial adjustment assembly and the translation adjustment assembly used in this embodiment can share the magnet component 52, which is conducive to further miniaturization and simplification of the camera module structure. The support seat 60, the first elastic assembly 80, the second elastic assembly 10, the axial adjustment assembly 50, the image sensor assembly 40, and the translation adjustment assembly are all arranged inside the housing 20. The structure and actuation principle of the axial adjustment assembly and the translation adjustment assembly will be described in detail below.

[0047] The image sensor assembly 40 is suspended on the support base 60 through the first elastic assembly 80. The position of the image sensor assembly 40 corresponds to the position of the lens 100, so that the external light can directly reach the image sensor assembly 40 after passing through the lens 100, and the photosensitive component on the image sensor assembly 40 generates a corresponding image signal.

[0048] Next, the specific technical solution of the adjustable image sensor unit is further described.

[0049] In this embodiment, the second elastic component 10 is an elastic circuit board. The elastic circuit board includes an inner frame 13, an intermediate frame 12 that surrounds the outer periphery of the inner frame 13 at intervals, and an outer frame 11 that surrounds the outer periphery of the intermediate frame 12 at intervals. The outer frame 11 is fixed to the bottom plate 21 of the shell 20; the inner frame 13 is suspendedly connected to the intermediate frame 12 through an elastic cantilever 14; the intermediate frame 12 is suspendedly connected to the outer frame 11 through an elastic structure 15. Among them, the elastic cantilever 14 is extended along at least half of the circumference of the edge profile of the inner frame 13, one end of the elastic cantilever 14 is connected to the outer frame 11, and the other end is connected to the inner frame 13. Such a structure can increase the torque of the elastic cantilever 14, making the elastic cantilever 14 easy to deform, so that the inner frame 13 is easy to drive, and it still has sufficient stability while being easy to drive. Secondly, compared with the spring wire, the elastic cantilever 14 has a simpler structure and low manufacturing cost.

[0050] In this embodiment, the elastic cantilever 14, the inner frame 13 and the middle frame 12 are located in the same XY axis plane, and the elastic cantilever 14 is located between the inner frame 13 and the middle frame 12. In this way, the elastic cantilever 14, the inner frame 13 and the middle frame 12 are located in the same plane, making the elastic circuit board appear flat and the structure more compact, which is beneficial to reducing the overall thickness of the camera module.

[0051] Furthermore, in this embodiment, the extended length of the elastic cantilever 14 is greater than or equal to three quarters of the edge circumference of the inner frame 13, so that the elastic cantilever 14 has a sufficient extension length, increases the torque of the elastic cantilever 14, and makes the elastic cantilever 14 more prone to elastic deformation.

[0052] Furthermore, in this embodiment, the length of the elastic cantilever 14 is less than the circumference of the edge of the inner frame 13, so as to avoid the moment of the elastic cantilever 14 being too long, causing the elastic cantilever 14 to become relatively weak and easily deformed. In addition, it can also avoid the elastic cantilever 14 extending too long and occupying too much installation space. Of course, in other embodiments, the length of the elastic cantilever 14 can be greater than or equal to the circumference of the inner frame edge. When the length of the elastic cantilever 14 is greater than the circumference of the inner frame edge, the elastic cantilever 14 can be spirally wrapped.

[0053] Furthermore, in this embodiment, the inner frame 13 is square in shape; two ends of the elastic cantilever 14 are respectively located on two sides of one corner of the inner frame 13 .

[0054] In this embodiment, the elastic structure 15, the middle frame 12 and the outer frame 11 are located in the same XY axis plane, and the elastic structure 15 is located between the middle frame 12 and the outer frame 11. In this way, the elastic structure 15, the outer frame 11 and the middle frame 12 can be located in the same plane, making the elastic circuit board appear flat and the structure more compact, which is conducive to reducing the overall thickness of the camera module. Preferably, the outer frame 11, the elastic structure 15, the middle frame 12, the elastic cantilever 14 and the inner frame 13 are all located in the same XY axis plane.

[0055] Furthermore, in this embodiment, the edge profile of the middle frame 12 is in a cube shape; the elastic structure 15 includes at least one elastic frame 153 that surrounds the outer periphery of the middle frame 12 at intervals, and the elastic frame 153 is connected to the middle frame 12 through a group of first connecting blocks 151 symmetrically arranged on opposite sides of the middle frame 12; the elastic frame 153 is connected to the outer frame 11 through a group of second connecting blocks 152 symmetrically arranged on other opposite sides of the middle frame 12. The above-mentioned structural solution allows the elastic frame 153 to have a large deformation elastic force when deforming in the XY axis plane, which can drive the middle frame 12 to return to its original position.

[0056] Preferably, the number of elastic frames 153 is two, one of the two elastic frames 153 surrounds the periphery of the other at intervals, and one of the two elastic frames 153 is fixedly connected to the other through the first connecting block 151 and the second connecting block 152. According to the aforementioned method, the middle frame 12 can be driven to return to its original position by the deformation elastic force of the two elastic frames 153, and the driving force is relatively strong. Of course, in other embodiments, the number of elastic frames 153 can be increased or decreased according to the needs of the actual application scenario, thereby increasing or decreasing the deformation elastic force of the elastic structure 15. Furthermore, the corners of the two elastic frames 153 are connected together by a connecting member 154, which can increase the connection stability and connection strength of the two elastic frames 153.

[0057] In this embodiment, the outer frame 11, the middle frame 12 and the inner frame 13 are all circuit boards. The elastic structure 15 and the elastic cantilever 14 are both conductive components. For example, the surfaces of the elastic structure 15 and the elastic cantilever 14 are etched with circuits, so that the two become conductive components. For another example, the elastic structure 15 and the elastic cantilever 14 themselves are composed of elastic metal sheets, which can have obvious elasticity and can be conductive. Of course, the elastic structure 15 and the elastic cantilever 14 can also achieve conductivity in other ways. The external conductive component is electrically connected to the outer frame 11, and the outer frame 11 is electrically connected to the middle frame 12 through the elastic structure 15; the middle frame 12 is electrically connected to the inner frame 13 through the elastic cantilever 14, and the image sensor assembly 40 is electrically connected to the inner frame 13, so that the image sensor assembly 40 can exchange electrical signals with the outside world through the inner frame 13, the elastic cantilever 14, the middle frame 12, the elastic structure 15 and the outer frame 11.

[0058] In this embodiment, the support seat 60 is arranged at the bottom of the inner cavity of the shell 20. The support seat 60 includes a bottom frame and a support column 61 extending upward from the top wall of the bottom frame, and the bottom frame is fixedly connected to the top surface of the middle frame 12 of the elastic circuit board. After the support seat 60 moves in the XY plane, the middle frame 12 drives the support seat 60 to return to its original position. Specifically, the bottom frame is a square frame, and the number of its support columns 61 is four, and the four support columns 61 are arranged in a rectangular shape. The image sensor assembly 40 is located between the four support columns 61; the first elastic assembly 80 includes four elastic sheets, one end of the four elastic sheets is respectively fixed to the four support columns 61; the other end of the four elastic sheets is fixed to the image sensor assembly 40.

[0059] In other embodiments, the number of support columns 61 can be appropriately increased or decreased according to actual needs. As long as it can support the image sensor assembly 40 through the first elastic component 80, so that the image sensor is suspended. For example, the number of support columns 61 can be two, three, or five or more. In other embodiments, the number of elastic sheets can be appropriately increased or decreased, as long as it can suspend the image sensor assembly 40 on the support column 61. The elastic sheet can also be made of a conductive material, or a circuit can be formed on the elastic sheet by, for example, etching, so that the image sensor assembly 40 can also exchange electrical signals with the outside world through the first elastic component 80. In other embodiments, the first elastic component 80 can be composed of an elastic member commonly used in the industry, but it must be ensured that it can suspend the image sensor assembly 40 on the support column 61, and after the image sensor assembly 40 is tilted relative to the support seat 60, it uses its own deformation elastic force to force the image sensor assembly 40 to return to its original position. For example, the first elastic component 80 can be a spring wire.

[0060] As mentioned above, the axial adjustment assembly includes a bracket 30, a first coil 51 and a magnet component 52. The bracket 30 includes a frame portion 32 surrounding the periphery of the image sensor assembly 40, and the frame portion 32 is spaced from the image sensor assembly 40. The magnet component 52 is fixed to the frame portion 32, and the first coil 51 is fixed to the image sensor assembly 40 and is opposite to the magnet component 52. After the first coil 51 is energized, the interaction force generated by the first coil 51 and the magnet component 52 drives the image sensor assembly 40 to tilt relative to the support seat 60.

[0061] In this embodiment, the number of magnet components 52 is four, and the four magnet components 52 are arranged at equal intervals around the image sensor assembly 40. Specifically, the frame portion 32 is in the shape of a square frame, and the four magnet components 52 are respectively arranged on the four side walls of the frame portion 32. More specifically, the four side walls of the frame portion 32 are each provided with a hollow assembly window 321, and the four magnet components 52 are respectively embedded in the four assembly windows 321 of the frame portion 32. In this way, there is no barrier between the magnet component 52 and the first coil 51, so as to avoid the barrier from weakening the interaction force effect generated by the magnet component 52 and the first coil 51.

[0062] The number of magnet components 52 is the same as the number of first coils 51; the positions of each magnet component 52 and each first coil 51 correspond to each other. Each magnet component 52 forms a power supply group with the corresponding first coil 51, and the working process of each power supply group is independent of each other. Based on the electromagnetic thrust, each side of the image sensor assembly 40 is provided with a force in a direction parallel to the optical axis (i.e., the Z-axis direction shown in the figure), so that the axial adjustment assembly can be used to drive the image sensor assembly 40 to move forward and backward along the optical axis as a whole, and further, by changing the direction and magnitude of the force of each power supply group on the image sensor assembly 40, the forces on each side of the image sensor assembly 40 are different, so that the image sensor assembly 40 is tilted relative to the optical axis. For example, when the power supply group corresponding to the left side of the image sensor assembly 40 provides a larger force toward the positive direction of the Z axis to the left side, and the power supply group corresponding to the right side of the image sensor assembly 40 provides a smaller force toward the positive direction of the Z axis to the right side, the left side will move a greater distance toward the positive direction of the Z axis than the right side, so that the image sensor assembly 40 tilts toward the right side of the optical axis. Alternatively, when the power supply group corresponding to the left side provides a force toward the positive direction of the Z axis to the left side, and the power supply group corresponding to the right side provides a force toward the negative direction of the Z axis to the right side, the left side moves toward the positive direction of the Z axis, while the right side moves toward the negative direction of the Z axis, so that the image sensor assembly 40 can be tilted to a greater extent toward the right side of the optical axis. Through the above principle, the image sensor assembly 40 can be controlled to tilt at any angle relative to the optical axis, and the existing angular error of the image sensor assembly 40 relative to the optical axis can be compensated by this means.

[0063] As mentioned above, the translation adjustment assembly includes a magnet component 52, a second coil 53 and a mounting plate 22, wherein the mounting plate 22 is in a square frame shape, the number of the second coils 53 is four, and they are fixedly connected to the inner wall of the mounting plate 22, and the four second coils 53 are arranged around the periphery of the frame portion 32 at equal intervals with the frame portion 32, and the positions of the second coils 53 and the magnet components 52 correspond one by one; the mounting plate 22 is fixedly connected to the inner wall of the housing 20. The interaction force generated by the second coils 53 and the magnet components 52 based on the electromagnetic thrust drives the support seat 60 to move in the XY plane determined by the X-axis and the Y-axis shown in the figure.

[0064] In this embodiment, the bracket 30 further includes a cover portion 31 extending inward from the top side of the frame portion 32 in a direction perpendicular to the optical axis of the camera module; the support seat 60 is slidably abutted against the bottom wall of the cover portion 31 through a sliding structure 70. When the support seat 60 moves, the support seat 60 slides along the bottom wall of the cover portion 31 through the sliding structure 70, so that the movement process of the support seat 60 is more stable.

[0065] The support seat 60 includes a bottom frame and four support columns 61 extending upward from the top wall of the bottom frame; the four support columns 61 are arranged in a rectangular shape; the sliding structure 70 includes four grooves 72 respectively opened on the top surfaces of the support columns 61, and each groove 72 is provided with at least one ball 71; the upper side of the ball 71 is exposed above the corresponding groove 72 and abuts against the cover portion 31.

[0066] In this embodiment, the image sensor assembly 40 includes a carrier plate, a chip carrier plate 41 arranged on the carrier plate, and a chip 43 arranged on the chip carrier plate 41. Specifically, the carrier frame 42 is in the shape of a square frame, the top surface of the carrier frame 42 is fixedly connected to the elastic sheet, and the carrier frame 42 is suspended between four support columns 61 by means of four elastic sheets. The chip carrier plate 41 is arranged on the bottom surface of the carrier frame 42; the chip 43 is arranged on the top surface of the chip carrier plate 41 and is located in the carrier frame 42. Among them, the chip 43 is a photosensitive component of the image sensor, and the photosensitive surface of the chip 43 is the photosensitive surface of the image sensor assembly 40. The first coil 51 is fixedly connected to the side wall of the carrier plate 42. Preferably, as Figure 2 As shown, the size of the chip carrier plate 41 of the image sensor assembly 40 facing the support seat 60 and the base plate 21 is appropriately reduced compared to the size facing the chip 43 and the lens 100 to prevent the chip carrier plate 41 from interfering with other devices inside the camera module.

[0067] As described above, the axial adjustment component 50 is connected to the image sensor component 40 to adjust the distance between the image sensor component 40 and the lens 100 in the optical axis direction and the angle of the image sensor component 40 relative to the optical axis direction. After the axial adjustment component 50 has adjusted the angle of the image sensor component 40 relative to the optical axis direction, the image sensor component 40 can be driven to return to its original position relative to the support seat 60 by the deformation elastic force of the elastic component.

[0068] As described above, the translation adjustment component is connected to the support seat 60, and can be used to drive the support seat 60 to move in a plane perpendicular to the optical axis of the camera module. Specifically, the XY axis plane is perpendicular to the optical axis of the camera module, and the translation adjustment component drives the support seat 60 to move in the XY axis plane. The support seat 60 drives the image sensor assembly 40 to move in the XY axis plane, which can change the relative position of the image sensor assembly 40 and the optical axis of the camera module, compensate for the position deviation of the image sensor assembly 40 caused by shaking in the XY axis plane, and realize the anti-shake of the camera module. The second elastic component 10 is connected to the support seat 60. After the support seat 60 moves in a plane perpendicular to the optical axis of the camera module, the deformation elastic force of the second elastic component 10 forces the support seat 60 to return to its original position.

[0069] Compared with the prior art, this embodiment uses an axial adjustment component and a translation adjustment component built into the camera module to replace the traditional AA device to adjust the relative position and angle of the image sensor component 40 and the lens 100, which has the advantages of smaller hardware volume, simpler structure and low cost.

[0070] In one application scenario, during the assembly of the camera module 130, if the image sensor assembly 40 is not perpendicular to the optical axis of the camera module, the axial adjustment assembly can be used to drive the image sensor assembly 40 to adjust the angle of the image sensor assembly 40 relative to the optical axis until the photosensitive surface of the image sensor assembly 40 is perpendicular to the optical axis of the camera module. When the photosensitive surface of the image sensor assembly 40 is perpendicular to the optical axis of the camera module, the position and posture parameters of the lens 100 and the position and posture parameters of the image sensor assembly 40 can be obtained by, for example, existing testing means. Based on the acquired position and posture parameters of the image sensor assembly 40, the position and posture parameters of the image sensor assembly 40 when it is restored to its original position relative to the support seat 60 are calculated. Based on the position and posture parameters of the image sensor assembly 40 when it returns to its original position relative to the support base 60 and the position and posture parameters of the lens 100 obtained above, the ideal position and posture parameters of the lens 100 corresponding to the time when the optical axis of the lens 100 is perpendicular to the photosensitive surface of the image sensor assembly 40 are finally calculated. Finally, the actual installation position and posture of the lens 100 are adjusted according to the position and posture parameters of the lens 100, so that after the lens 100 is installed, the optical axis of the camera module is perpendicular to the photosensitive surface of the image sensor assembly 40.

[0071] In another application scenario, during the operation of the camera module 130, the axial adjustment component can be used to drive the image sensor component 40 to tilt relative to the support base 60, so that the photosensitive surface of the image sensor component 40 forms a certain angle with the optical axis of the camera module; the translation adjustment component can be used to drive the image sensor component 40 to move in the XY axis plane, so that the image sensor component 40 has a certain position deviation relative to the optical axis in the XY axis plane; in this way, the image sensor component 40 can sense the optical signal collected by the lens 100 in a special posture, thereby generating a special photosensitive signal and obtaining a special image effect, such as obtaining a fantasy effect of deformation and distortion of the picture.

[0072] From the foregoing description, it is not difficult to find that the axial adjustment assembly and the translational adjustment assembly of the present embodiment can not only assist in assembling the camera module during the camera module assembly stage, but also enable the camera module to generate special photosensitive signals to obtain special image effects when the camera module is working, thus having the advantage of diversified functions.

[0073] Another aspect of the present application discloses an adjustable image sensor unit, such as the adjustable image sensor unit included in the camera module 130 described in the above embodiment.

[0074] Another embodiment of the present application discloses a smart wearable device, which can be a watch, a mobile phone, virtual reality glasses, a bracelet, or other wearable electronic device with a shooting function. The smart wearable device includes the camera module 130 described in the above embodiment, and the camera module 130 is used to collect image signals for the smart wearable device. It can be understood that the smart wearable device also has various beneficial effects of the camera module 130 described in the above embodiment.

[0075] See also Figure 6 On the other hand, an embodiment of the present application discloses a camera module calibration system for calibrating the above-mentioned camera module 130, and the camera module calibration system includes: a test component 120, for the camera module 130 to shoot a test image; a control unit 110, for connecting with the camera module 130 and controlling the camera module 130 to shoot the test component 120, obtaining a resolution change curve of the camera module 130 during the shooting process, and controlling the axial adjustment component to adjust the position and tilt of the image sensor component 40 relative to the lens 100 according to the resolution change curve, so that the image sensor component 40 reaches an optimal sensing position and alignment state relative to the lens 100, and records and stores the adjusted position data of the image sensor component 100 and the lens 40. The control unit 110 includes a controller 112 and a driving module 111 . The controller 112 may be a data processing device such as a microcomputer, a single-chip microcomputer, etc. The driving module 111 is a connecting component for electrically connecting the camera module 130 to the camera module 130 .

[0076] The camera module calibration system is specifically used to calibrate the installation positions of the image sensor assembly 40 and the lens 100 before assembling the image sensor assembly 40 and the lens 100 of the camera module 130. In this way, in the subsequent assembly, as long as the image sensor assembly 40 and the lens 100 are fixedly assembled at the calibrated installation positions, the tilt between the image sensor assembly 40 and the lens 100 can be effectively eliminated, so that the imaging surface of the image sensor assembly 40 can be well vertically aligned with the optical axis of the lens 100, so that the camera module 130 has good optical performance.

[0077] The specific operation of calibrating the installation positions of the image sensor assembly 40 and the lens 100 of the camera module 130 using the camera module calibration system is described in detail below.

[0078] First, the various components of the camera module 130 are preliminarily assembled according to the specific assembly method described above. The preliminarily assembled camera module 130 is arranged at a position that can be used to shoot the test component 120, so that the test component 120 is arranged opposite to the lens 100 in the camera module 130 and arranged on the optical axis of the lens 100. The image sensor component 40, the translation adjustment component, and the axial adjustment component in the camera module 130 are all electrically connected to the controller 112 through the driving module 111.

[0079] The image sensor assembly 40 is then controlled to move by the control unit 110, preferably by the controller 112 via the driving module 111 and the translation adjustment assembly to control the image sensor assembly 40 to move in the XY plane shown in the figure, so that the geometric center of the image sensor assembly 40 is aligned with the optical axis 102 of the lens 100.

[0080] Next, the controller 112 controls the image sensor assembly 40 to move back and forth along the direction of the optical axis 102 of the lens 100 (that is, along the Z-axis direction shown in the figure) through the driving module 111 and the axial adjustment assembly, that is, to perform a defocusing movement; during the movement, the image sensor assembly 40 continuously senses the image of the test component 120 captured by the lens 100 and generates a corresponding image signal; at the same time, the existing position sensing device in the camera module 130, such as a Hall sensor, detects the position change of the image sensor assembly 40 relative to the lens 100 in real time and generates a corresponding position signal. The control unit 110 obtains the image signal and the position signal in real time, and draws a resolution change curve of the lens 100 according to the corresponding relationship between the resolution of the image signal and the position signal.

[0081] After obtaining the resolution change curve of the lens 100, the optimal sensing position of the image sensor assembly 40 relative to the lens 100 can be first determined according to the resolution change curve. The specific determination method can refer to the prior art and will not be repeated here. Then, the axial adjustment assembly is controlled to move the image sensor assembly 40 as a whole to the optimal sensing position.

[0082] At the same time, the specific inclination of each edge area of ​​the image sensor assembly 40 relative to the optical axis 102 of the lens 100 can also be calculated according to the resolution change curve. The specific calculation method can refer to the prior art and will not be repeated here. After determining the specific inclination of each edge area of ​​the image sensor assembly 40 relative to the optical axis 102 of the lens 100, the axial adjustment assembly is controlled based on the determined inclination to drive each edge of the image sensor assembly 40 to move respectively to adjust the inclination of each edge area of ​​the image sensor assembly 40, so as to eliminate the inclination of each edge area relative to the optical axis 102 of the lens 100, so that the image sensor assembly 40 is as accurately perpendicular to the optical axis 102 of the lens 100 as possible, that is, parallel to the imaging surface of the lens 100, so that the image sensor assembly 40 reaches the best alignment state relative to the lens 100. Please refer to further details here. Figure 7 , which shows a schematic diagram of the change in the alignment state of the lens 100 and the image sensor assembly 40 in the camera module 130 before and after adjustment by the camera module calibration system. It can be seen that the image sensor assembly 40 is not perpendicular to the optical axis 102 of the lens 100 before adjustment, but is perpendicular to the optical axis 102 after adjustment, and has an optimal alignment state.

[0083] Afterwards, the resolution change curve of the camera module 130 can be obtained again according to the above-mentioned resolution change curve acquisition method, and whether the image sensor component 40 has reached the optimal sensing position and alignment state relative to the lens 100 can be determined based on the resolution change curve obtained again; the specific determination method can refer to the prior art and will not be repeated here. If the image sensor component 40 has not reached the optimal sensing position and alignment state relative to the lens 100, the above-mentioned operations of obtaining the resolution change curve and adjusting according to the resolution change curve can be repeated. If the image sensor component 40 has reached the optimal sensing position and alignment state relative to the lens 100, the position data of the adjusted image sensor component 40 and the lens 100 are recorded and stored. In this way, the calibration data suitable for the camera module 130 is obtained, and the calibration operation is completed.

[0084] In the actual manufacturing process, after obtaining the calibration data suitable for the camera module 130, the image sensor assembly 40 can be first fixed according to the calibration data, and the image sensor assembly 40 can be kept fixed in the best self-position recorded in the calibration data; then the lens 100 is removed from the shell 20, glue is applied to the corresponding part of the shell 20, and the lens 100 is reinstalled into the shell 20 for bonding, so that the self-position of the lens 100 after bonding and its relative position with the image sensor assembly 40 are consistent with the calibration data, that is, they are respectively in the best self-position and the best relative position recorded in the calibration data, and finally the glue is cured to fix the lens 100 in the shell 20, so that the image sensor assembly 40 reaches the best initial assembly state relative to the lens 100.

[0085] Compared with the prior art, the camera module calibration system of this embodiment does not need to use AA equipment, but can adjust the relative position of the image sensor assembly 40 and the lens 100 through the axial adjustment assembly built into the camera module 130. Most of the current camera modules must be equipped with a corresponding axial adjustment assembly to drive the image sensor assembly to move along the optical axis of the lens and adjust the inclination of the image sensor assembly relative to the optical axis of the lens. When the camera module calibration method of this embodiment is used to calibrate the existing camera module, it is not necessary to add an additional hardware structure dedicated to the above-mentioned calibration operation in the calibrated camera module. Therefore, the camera module calibration method of this embodiment reduces the hardware requirements for calibrating the camera module 130, simplifies the calibration operation process, and helps to reduce manufacturing costs and improve production efficiency.

[0086] As long as it does not violate the creative ideas of the present invention, any combination of the various embodiments of the present invention shall be regarded as the contents disclosed by the present invention; within the technical concept of the present invention, any combination of various simple modifications of the technical scheme and different embodiments that does not violate the creative ideas of the present invention shall be within the protection scope of the present invention.

Claims

1. An adjustable image sensor unit, applied to a camera module (130), characterized in that: The adjustable image sensor unit comprises a support seat (60), a first elastic component (80), a second elastic component (10), an axial adjustment component, an image sensor component (40) and a translation adjustment component; the image sensor component (40) is suspended on the support seat (60) through the first elastic component (80); the translation adjustment component is connected to the support seat (60) and is used to drive the support seat (60) to move in a plane perpendicular to the optical axis of the camera module; the second elastic component (10) is connected to the support seat (60) and is used to drive the support seat (60) to return to its original position through elastic force after the support seat (60) moves in a plane perpendicular to the optical axis; the axial adjustment component is connected to the image sensor component (40) and is used to drive the image sensor component (40) to move along the optical axis and to tilt relative to the optical axis; the first elastic component (80) is used to drive the image sensor component (40) to return to its original position relative to the support seat (60) through elastic force after the image sensor component (40) tilts relative to the optical axis.

2. The adjustable image sensor unit according to claim 1, characterized in that The axial adjustment component comprises a bracket (30), a first coil (51) and a magnetic component (52); the bracket (30) comprises a frame portion (32) surrounding the periphery of the image sensor component (40), and the frame portion (32) is spaced apart from the image sensor component (40); the magnetic component (52) is fixed to the frame portion (32), the first coil (51) is fixed to the image sensor component (40) and is opposite to the magnetic component (52), and after the first coil (51) is energized, the interaction force generated by the first coil (51) and the magnetic component (52) drives the image sensor component (40) to tilt relative to the support seat (60).

3. The adjustable image sensor unit according to claim 2, characterized in that The number of the magnetic components (52) is four, and the four magnetic components (52) are arranged at equal intervals around the image sensor component (40); the number of the magnetic components (52) is the same as the number of the first coils (51); and the positions of the magnetic components (52) and the first coils (51) correspond one by one.

4. The adjustable image sensor unit according to claim 3, characterized in that The translation adjustment component comprises four second coils (53), and the four second coils (53) are fixedly arranged at equal intervals around the periphery of the frame part (32); the four second coils (53) are spaced from the frame part (32); and the positions of the second coils (53) and the magnetic components (52) correspond one by one.

5. The adjustable image sensor unit according to claim 2, characterized in that: The bracket (30) also includes a cover portion (31) extending inward from the top side of the frame portion (32) in a direction perpendicular to the optical axis of the camera module; the support seat (60) is slidably abutted against the bottom wall of the cover portion (31) through a sliding structure (70); the support seat (60) includes a bottom frame and four support columns (61) extending upward from the top wall of the bottom frame; the four support columns (61) are arranged in a rectangular shape; the sliding structure (70) includes four grooves (72) respectively opened on the top surface of the support column (61), each of the grooves (72) is provided with at least one ball (71); the upper side of the ball (71) is exposed above the corresponding groove (72) and abuts against the cover portion (31).

6. The adjustable image sensor unit according to claim 5, characterized in that The image sensor assembly (40) is located between the four support columns (61); the first elastic assembly (80) comprises four elastic sheets, one end of the four elastic sheets is respectively fixed to the four support columns (61); the other end of the four elastic sheets is fixed to the image sensor assembly (40).

7. The adjustable image sensor unit according to claim 6, characterized in that The image sensor assembly (40) comprises a carrier frame (42), a chip carrier plate (41) arranged on the carrier frame (42), and a chip (43) arranged on the chip carrier plate (41); the carrier frame (42) is fixedly connected to the elastic sheet, and the carrier frame (42) is suspended between four support columns (61) by means of four elastic sheets.

8. The adjustable image sensor unit according to claim 2, characterized in that: The second elastic component (10) includes an elastic circuit board; the elastic circuit board includes an inner frame, an intermediate frame spaced around the periphery of the inner frame, and an outer frame spaced around the periphery of the intermediate frame; the inner frame is connected to the intermediate frame in suspension via an elastic cantilever; the intermediate frame is connected to the outer frame in suspension via an elastic structure; the frame portion (32) is fixedly connected to the outer frame; the support seat (60) is fixedly connected to the intermediate frame; and the image sensor component (40) is fixedly connected to the inner frame.

9. A camera module (130), characterized in that: The invention comprises a shell (20), a lens (100), a focus driving member (101) and an adjustable image sensor unit according to any one of claims 1 to 8, wherein the support seat (60), the first elastic component (80), the second elastic component (10), the axial adjustment component (50), the image sensor component (40) and the translation adjustment component are all arranged inside the shell (20); the translation adjustment component is fixedly connected to the inner wall of the shell (20); the shell (20) comprises an assembly hole connected to the inner cavity of the shell (20), and the position of the assembly hole corresponds to the position of the image sensor component (40); the lens (100) is arranged in the assembly hole; the focus driving member (101) connects the lens (100) and the shell (20) to drive the lens (100) to move along the optical axis of the camera module (130).

10. A camera module calibration system, used for calibrating the camera module (130) according to claim 9, characterized in that: The camera module calibration system comprises: A test component (120), used for the camera module (130) to capture a test image; A control unit (110) is used to connect to the camera module (130) and control the camera module (130) to shoot the test component (120), obtain a resolution change curve of the camera module (130) during the shooting process, and control the axial adjustment component to adjust the position and tilt of the image sensor component (40) relative to the lens (100) according to the resolution change curve, so that the image sensor component (40) reaches an optimal sensing position and alignment state relative to the lens (100), and record and store the adjusted position data of the image sensor component (40) and the lens (100).

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