Image acquisition module

Abstract

The utility model belongs to the technical field of image acquisition, and particularly relates to an image acquisition module. The utility model provides an image acquisition module comprising a pedestal comprising a first installation part and a second installation part which are connected with each other; the lens is mounted on the first mounting part; the first mounting seat is mounted on the second mounting part; the second assembly is mounted on the first mounting seat, and the first assembly moves along the axial direction of the lens relative to the second assembly under the driving of a magnetic field; and the image sensor is mounted on one side, facing the lens, of the first assembly. According to the utility model, the power and the driving force of the driving device in the image acquisition module can be obviously improved, so that the focusing speed is improved, and the mechanical vibration interference resistance of the driving device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of image acquisition, and in particular to an image acquisition module. Background Art

[0002] In image acquisition, the prior art usually uses a ring-shaped hollow voice coil motor or a stepper motor gear set to drive the focusing component of the lens to achieve the focus of the lens. However, the mass of the lens (especially the mass of the telephoto lens) is generally greater than the mass of the image sensor circuit board. In order to achieve high-speed focusing, the load of the motor should be reduced as much as possible. In this regard, the applicant proposes to use a cylindrical magnet voice coil motor to drive the image sensor to focus, so as to achieve high-speed focusing at a lower cost. However, the voice coil motor currently used is a ring-shaped hollow structure. The voice coil motor of this structure has low power, small driving force, and poor resistance to mechanical vibration interference. Therefore, it cannot stably drive the circuit board to move to achieve accurate focusing. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides an image acquisition module for solving the technical problem that the existing image acquisition module cannot stably drive the image sensor to move so as to achieve accurate focusing.

[0004] The technical solution adopted by the utility model is:

[0005] In a first aspect, the utility model provides an image acquisition module, comprising:

[0006] A base, comprising a first mounting portion and a second mounting portion connected to each other;

[0007] A lens is mounted on the first mounting portion;

[0008] A first mounting seat, mounted on the second mounting portion;

[0009] A voice coil motor, comprising a first component and a second component, wherein the second component is mounted on the first mounting seat, and the first component moves relative to the second component along the axial direction of the lens under the driving of a magnetic field, wherein the first component comprises a coil and a coil mounting seat, wherein the coil is connected to the coil mounting seat, and the second component comprises a cylindrical magnet, wherein the magnet at least partially penetrates into the coil;

[0010] The image sensor is mounted on a side of the first component facing the lens.

[0011] Preferably, it further comprises a movement detection sensor, which is mounted on the first mounting seat and is used to detect the movement position of the first component.

[0012] Preferably, it further comprises a second mounting seat, wherein the second mounting seat is connected to one end of the first component facing the lens, and the image sensor is mounted on the second mounting seat.

[0013] Preferably, the movement detection sensor is a Hall sensor, a detection head is provided on the Hall sensor, and a magnet is provided on a side of the second mounting seat facing the detection head.

[0014] Preferably, a boss is provided on a side of the second mounting seat facing the detection head, the magnet is mounted on the boss, and at least a portion of the magnet protrudes from the boss in a direction close to the detection head.

[0015] Preferably, the second mounting seat is provided with a first groove recessed in a direction away from the lens, the first groove matches the shape of at least a portion of an outer wall of the image sensor, a portion of the image sensor facing away from the lens is arranged in the first groove, a plurality of connecting structures are arranged around the first groove, and the image sensor is connected to the second mounting seat via the connecting structures.

[0016] Preferably, it also includes a mounting plate, one end of which is connected to the first mounting seat and the other end is suspended in the air, the motion detection sensor is installed at one end of the mounting plate away from the first mounting seat, and the mounting plate is located above the second mounting seat.

[0017] Preferably, the mounting plate includes a first connecting portion and a second connecting portion, a second groove is provided at one end of the first mounting seat facing away from the second mounting portion, at least a portion of the first connecting portion is located in the second groove and is connected to the first mounting seat at the position of the second groove, the motion detection sensor is connected to the second connecting portion, a first avoidance space is provided on the side of the second connecting portion facing the image sensor, at least a portion of the motion detection sensor is located in the first avoidance space, a detection head of the motion detection sensor is located on the side of the second connecting portion facing the magnet, and at least one opening that passes through the first connecting portion is provided on a portion of the first connecting portion located between the first mounting seat and the second connecting portion, and at least a portion of the first component is located in the opening.

[0018] Preferably, a first mounting hole with an inner wall being a cylindrical surface is provided on the first mounting seat, and an outer surface of at least a portion of the second component is a cylindrical surface and penetrates into the first mounting hole.

[0019] Preferably, the first mounting portion and the second mounting portion are "L"-shaped, the first mounting seat is located at an end of the second mounting portion away from the first mounting portion, at least a portion of the lens is located in the second mounting hole, and both ends of the lens extend out of the second mounting hole respectively.

[0020] Beneficial effect: The image acquisition module of the utility model installs the lens on the first mounting portion of the base, and installs the voice coil motor on the second mounting seat, so that the first component moves relative to the second component under the drive of the magnetic field, thereby driving the image sensor installed on the first component to move relative to the lens to achieve focusing. Since the voice coil motor in this embodiment adopts a magnetic structure with a cylindrical center, it can have higher power and driving force, and has higher resistance to mechanical vibration interference, so that the focus of the image acquisition module can be achieved quickly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment of the utility model will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the utility model.

[0022] Figure 1 It is an exploded diagram of the image acquisition module of the utility model;

[0023] Figure 2 This is a schematic diagram of the assembly structure of the image acquisition module of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the voice coil motor in the utility model;

[0025] Figure 4 This is an exploded view of the voice coil motor of the utility model;

[0026] Figure 5 It is a schematic diagram of the assembly structure of the voice coil motor of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the second mounting seat in the utility model;

[0028] Figure 7 This is a structural diagram of the middle mounting plate of the utility model

[0029] Figure 8 It is a structural schematic diagram of the first mounting seat in the utility model.

[0030] Parts and their numbers in the figure:

[0031] Base 1, first mounting part 11, second mounting part 12, lens 2, first mounting seat 3, second groove 31, first mounting hole 32, voice coil motor 4, first component 41, shell 411, cover 412, limit ring 413, first spring piece 414, second spring piece 415, gasket 416, gasket 417, second component 42, magnet 421, coil 422, coil fixing seat 423, mounting part 424, image sensor 5, motion detection sensor 6, magnet 61, detection head 62, second mounting seat 7, boss 71, first groove 72, connecting structure 73, mounting plate 8, first connecting part 81, second connecting part 82, opening 83. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the embodiments of the utility model and the various features in the embodiments can be combined with each other, all within the scope of protection of the utility model.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, the utility model provides an image acquisition module, which mainly includes a base 1, a lens 2, a first mounting seat 3, a voice coil motor 4 and an image sensor 5.

[0035] The base 1 includes a first mounting portion 11 and a second mounting portion 12 connected to each other; for ease of manufacturing, the first mounting portion 11 and the second mounting portion 12 can be an integrated structure. In other examples, the first mounting portion 11 and the second mounting portion 12 can also be manufactured separately and then connected together. The base 1 serves as the installation base of the image acquisition module and is used to install and carry other components of the image acquisition module.

[0036] The lens 2 is mounted on the first mounting portion 11; and the first mounting seat 3 for mounting the voice coil motor 4 is mounted on the second mounting portion 12; in specific implementation, after using a clamp to adjust the spatial 3D posture of the first mounting seat 3 so that the image sensor and the lens are fully aligned, the first mounting seat 3 can be bonded to the second mounting portion 12, and UV curing glue can be used for bonding.

[0037] like Figures 3 to 5 As shown, the voice coil motor 4 in this embodiment includes a first component 41 and a second component 42, the second component 42 is mounted on the first mounting seat 3, and the first component 41 moves relative to the second component 42 along the axial direction of the lens 2 under the driving of the magnetic field;

[0038] The second component 42 includes a cylindrical magnet 421 , a cover 412 and a shell 411 . The first component 41 includes a coil 422 and a coil mounting seat 423 . The coil 422 is connected to the coil mounting seat 423 .

[0039] When current flows through the coil 423 , a magnetic field is generated in the space near the magnet 421 to drive the first component 41 to move relative to the second component 42 .

[0040] In the specific implementation, the housing 411 and the cover 412 are assembled to form a receiving cavity. The first component 41 also includes a limiting ring 413, a first spring sheet 414, a second spring sheet 415, a gasket 416, a washer 417 and a mounting member 424 located in the receiving cavity, the gasket 416 and the washer 417 are located between the first spring sheet 414 and the second spring sheet 415, the limiting ring 413 is located between the second spring sheet 415 and the cover 412, one end of the coil fixing seat 423 passes through the mounting member 424, the limiting ring 413, the first spring sheet 414, the second spring sheet 415, the gasket 416 and the washer 417, the mounting member 424 is connected to the coil fixing seat 423, the image sensor 5 is installed on the mounting member 424, the coil 422 is connected to the second spring sheet 415, and when the coil fixing seat 423 moves with the coil, the mounting member 424 can be driven to move in real time. The driving method realized by the voice coil motor of this embodiment using the above structure has greater driving power and stronger mechanical vibration resistance than the hollow voice coil motor, and has a compact structure, low cost and fast driving speed compared to the stepper motor.

[0041] The image sensor 5 is installed on the side of the first component 41 facing the lens 2, so that the light passing through the lens 2 can be collected by the image sensor 5. After being installed on the first component 41, the image sensor 5 can move synchronously with the first component 41. Since the lens 2 is fixed on the base, the relative distance between the image sensor 5 and the lens 2 along the axial direction of the lens 2 can be controlled by controlling the moving position of the first component 41, thereby realizing automatic focusing of the image acquisition component.

[0042] The image acquisition module of this embodiment further includes a motion detection sensor 6 , which is mounted on the first mounting seat 3 . The motion detection sensor 6 is used to detect the moving position of the second component 41 .

[0043] This embodiment detects the actual moving position of the first component 41 by moving the detection sensor 6, thereby forming a closed-loop control of the moving position of the first component 41, thereby improving the accuracy of the movement of the image sensor 5, so that the image acquisition component can automatically focus quickly and accurately.

[0044] like Figure 2 and Figure 6 As shown, in order to facilitate the installation of the image sensor 5, the image acquisition component in this embodiment further includes a second mounting seat 7, the second mounting seat 7 is connected to the end of the first component 41 facing the lens 2, and the image sensor 5 is mounted on the second mounting seat 7. In this embodiment, the image sensor 5 is mounted on the first component 41 through the second mounting seat 7. When the first component 41 moves, the second mounting seat 7 moves, and the second mounting seat 7 drives the image sensor 5 to move, so that the image sensor 5 moves synchronously with the second component 42.

[0045] like Figure 2As shown, the movement detection sensor 6 is a Hall sensor, a detection head 62 is arranged on the Hall sensor, and a magnet 61 is arranged on the side of the second mounting seat 7 facing the detection head 62. Since the Hall sensor can detect the change of magnetic field strength, when the second mounting seat 7 moves, the magnet 61 moves with the second mounting seat 7. During the movement of the magnet 61, the magnetic field strength detected by the detection head 62 of the Hall sensor will also change. When the magnet 61 moves to different positions, the magnetic field strength detected by the detection head 62 of the Hall sensor is also different. The magnetic field strength detected by the detection head 62 of the Hall sensor is converted into a corresponding digital signal and transmitted to the controller. Since the magnet 61 and the image sensor 5 are both mounted on the second mounting seat 7, and the second mounting seat 7 is mounted on the first component 41, the magnet 61 and the image sensor 5 can move synchronously with the first component 41, so that the Hall sensor can accurately detect the position of the image sensor 5 by detecting the position of the magnet 61. In the process of calibrating the image acquisition component, the value detected by the Hall sensor when the focus is clear can be recorded, and the recorded value is used as the value to be achieved when the image sensor 5 is subsequently controlled to move for focusing. In this embodiment, by installing both the magnet 61 and the image sensor 5 on the first component 41, it is not only easy to install the magnet 61 and the image sensor 5, but also allows the magnet 61 and the image sensor 5 to move synchronously with the first component 41, thereby further improving the focusing accuracy of the image acquisition component.

[0046] like Figure 6 As shown, in this embodiment, a boss 71 is provided on the side of the second mounting seat 7 facing the detection head 62 , the magnet 61 is mounted on the boss 71 , and at least a portion of the magnet 61 protrudes from the boss 71 in a direction close to the detection head 62 .

[0047] In this embodiment, the magnet 61 is mounted on the boss 71 so that the magnet 61 can protrude toward the detection head 62, so that the detection head 62 can more easily detect the change in magnetic field strength caused by the movement of the magnet 61, thereby improving the accuracy of the Hall sensor in detecting the position of the image sensor 5. In a specific implementation, the magnet 61 is a rectangular parallelepiped magnet 61.

[0048] like Figure 6 As shown, in this embodiment, the second mounting seat 7 is provided with a first groove 72 recessed in a direction away from the lens 2, the first groove 72 matches the shape of at least a portion of the outer wall of the image sensor 5, a portion of the image sensor 5 facing away from the lens 2 is arranged in the first groove 72, a plurality of connecting structures 73 are arranged around the first groove 72, and the image sensor 5 is connected to the second mounting seat 7 via the connecting structures 73.

[0049] By setting the groove on the second mounting seat 7, a part of the image sensor 5 can be located in the groove of the second mounting seat 7 after installation, which can not only make the structure of the image acquisition component more compact and occupy less space, but also protect the image sensor 5 from the second mounting seat 7, reducing the impact of the external environment on the image sensor 5. The connection structure 73 set around the first groove 72 can be a threaded hole, and a threaded connector can be passed through the mounting hole on the image sensor 5 and connected to the threaded hole, so that the image sensor 5 is installed on the second mounting seat 7. Compared with the first groove 72, the surrounding area of ​​the first groove 72 is raised along the axial direction of the lens 2, which facilitates the connection of the connection structure 73 with the threaded connector.

[0050] like Figure 7 As shown, the image acquisition component of this embodiment also includes a mounting plate 8, one end of the mounting plate 8 is connected to the first mounting seat 3, and the other end is suspended in the air, the motion detection sensor 6 is installed on the end of the mounting plate 8 away from the first mounting seat 3, and the mounting plate 8 is located above the second mounting seat 7.

[0051] In order to enable the motion detection sensor 6 to accurately detect the movement of the image sensor 5, the present embodiment uses a mounting plate 8 to connect the motion detection sensor 6 to the first mounting seat 3. One end of the mounting plate 8 is fixed to the first mounting seat 3, and the other end extends toward the lens 2, and the motion detection sensor 6 is mounted on the suspended end of the mounting plate 8, which will not affect the movement of the image sensor 5, and can accurately detect the change in magnetic field strength generated by the magnet 61 that moves with the image sensor 5.

[0052] In this embodiment, the mounting plate 8 includes a first connecting portion 81 and a second connecting portion 82 , wherein the first connecting portion 81 is used to connect to the second mounting portion 12 , and the second connecting portion 82 is used to fix the motion detection sensor 6 .

[0053] The first mounting seat 3 is provided with a second groove 31 at one end facing away from the second mounting portion 12, and at least a portion of the first connecting portion 81 is located in the second groove 31 and connected to the first mounting seat 3 at the position of the second groove 31. In this embodiment, the second groove 31 provided at the upper portion of the first mounting seat 3 is connected to the first connecting portion 81 of the mounting plate 8, and the depth of the groove can accurately define the position of the mounting plate 8, so that the motion detection sensor 6 and the image sensor 5 are kept at a reasonable distance, which will not affect the movement of the image sensor 5 and can accurately detect the position of the image sensor 5.

[0054] like Figure 2 and Figure 7As shown, the motion detection sensor 6 is connected to the second connecting part 82, and a first avoidance space is provided on the side of the second connecting part 82 facing the image sensor 5, at least a part of the motion detection sensor 6 is located in the first avoidance space, and the detection head 62 of the motion detection sensor 6 is located on the side of the second connecting part facing the magnet 61.

[0055] In this embodiment, the mobile sensor is connected to the second connecting part 82 away from the first mounting seat 3, and the second connecting part 82 is retracted a certain distance relative to the first connecting part 81 in the direction away from the image sensor 5 to form a first avoidance space on the second connecting part 82, so that the mobile detection sensor 6 can maintain a suitable distance from the image sensor 5, so that the position of the image sensor 5 can be detected without affecting the movement of the image sensor 5.

[0056] like Figure 2 and Figure 7 As shown, the portion of the first connection portion 81 between the first mounting seat 3 and the second connection portion 82 is provided with at least one opening 83 penetrating the first connection portion 81, and at least a portion of the first component 41 is located in the opening 83. In this embodiment, the relative position between the mounting plate 8 and the first component 41 is defined by the aforementioned opening 83, while avoiding the influence of the mounting plate 8 on the first component 41.

[0057] like Figure 2 and Figure 8 As shown, in this embodiment, a first mounting hole 32 with a cylindrical inner wall is provided on the first mounting seat 3, and at least a portion of the outer surface of the second component 42 is a cylindrical surface and penetrates into the first mounting hole 32. In this embodiment, the first mounting hole 32 provided on the first mounting seat 3 is used to accommodate the voice coil motor 4, which can not only provide stability for the installation of the voice coil motor 4, but also protect the voice coil motor 4 from interference.

[0058] like Figure 1 and Figure 2 As shown, in this embodiment, the first mounting portion 11 and the second mounting portion 12 are arranged in an "L" shape, wherein the first mounting seat 3 is located at an end of the second mounting portion 12 away from the first mounting portion 11, and the first mounting portion 11 and the second mounting portion 12 are approximately in a vertical positional relationship, which provides sufficient space for the installation of the voice coil motor 4 and the image sensor 5, provides sufficient space for the movement of the image sensor 5, and makes the overall structure of the image acquisition module compact.

[0059] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention.

Claims

1. An image acquisition module, characterized in that: include: A base, comprising a first mounting portion and a second mounting portion connected to each other; A lens is mounted on the first mounting portion; A first mounting seat, mounted on the second mounting portion; A voice coil motor, comprising a first component and a second component, wherein the second component is mounted on the first mounting seat, and the first component moves relative to the second component along the axial direction of the lens under the driving of a magnetic field, wherein the first component comprises a coil and a coil mounting seat, wherein the coil is connected to the coil mounting seat, and the second component comprises a cylindrical magnet, wherein the magnet at least partially penetrates into the coil; The image sensor is mounted on a side of the first component facing the lens.

2. The image acquisition module according to claim 1, characterized in that: It also includes a movement detection sensor, which is installed on the first mounting seat and is used to detect the movement position of the first component.

3. The image acquisition module according to claim 2, characterized in that: It also includes a second mounting seat, which is connected to one end of the first component facing the lens, and the image sensor is mounted on the second mounting seat.

4. The image acquisition module according to claim 3, characterized in that: The movement detection sensor is a Hall sensor, a detection head is arranged on the Hall sensor, and a magnet is arranged on a side of the second mounting seat facing the detection head.

5. The image acquisition module according to claim 4, characterized in that: A boss is provided on one side of the second mounting seat facing the detection head, and the magnet is mounted on the boss.

6. The image acquisition module according to claim 4, characterized in that: The second mounting seat is provided with a first groove which is recessed in a direction away from the lens, the first groove matches the shape of at least a portion of the outer wall of the image sensor, a portion of the image sensor facing away from the lens is arranged in the first groove, a plurality of connecting structures are arranged around the first groove, and the image sensor is connected to the second mounting seat via the connecting structures.

7. The image acquisition module according to claim 4, characterized in that: It also includes a mounting plate, one end of which is connected to the first mounting seat and the other end is suspended in the air, the motion detection sensor is installed at one end of the mounting plate away from the first mounting seat, and the mounting plate is located above the second mounting seat.

8. The image acquisition module according to claim 7, characterized in that: The mounting plate includes a first connecting portion and a second connecting portion, a second groove is provided at one end of the first mounting seat facing away from the second mounting portion, at least a portion of the first connecting portion is located in the second groove and is connected to the first mounting seat at the position of the second groove, the motion detection sensor is connected to the second connecting portion, a first avoidance space is provided on the side of the second connecting portion facing the image sensor, at least a portion of the motion detection sensor is located in the first avoidance space, a detection head of the motion detection sensor is located on the side of the second connecting portion facing the magnet, and at least one opening that passes through the first connecting portion is provided on a portion of the first connecting portion located between the first mounting seat and the second connecting portion, and at least a portion of the first component is located in the opening.

9. The image acquisition module according to any one of claims 1 to 8, characterized in that: The first mounting seat is provided with a first mounting hole whose inner wall is a cylindrical surface, and the outer surface of at least a part of the second component is a cylindrical surface and penetrates into the first mounting hole.

10. The image acquisition module according to any one of claims 1 to 8, characterized in that: The first mounting portion and the second mounting portion are in an "L" shape, and the first mounting seat is located at an end of the second mounting portion away from the first mounting portion.

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