A sensor drive motor structure and anti-shake camera module

Abstract

The present application relates to the field of camera devices, and discloses a sensor drive motor structure and a camera module. The sensor drive motor structure drives the image sensor to perform anti-shake movement, including magnets that are respectively connected to the image sensor in a transmission manner and are arranged on the outside of the four sides and two ends of a diagonal of the image sensor. Coils are arranged on the outside of the magnets in a one-to-one correspondence, and the coils are conductively connected to the external circuit through a ring circuit board; the camera module also includes a support assembly for installing and supporting the movement of the image sensor, and the support assembly always provides a support base point located at the center of gravity of the image sensor. In the present application, magnets in different positions are allowed to play different roles, so that the functional modules in the motor are further refined while adding very few parts and ensuring the simplicity of the structure. It can not only simplify the software algorithm for controlling the current size of each coil, but also use a motor with a finer division of labor to achieve more accurate driving of the image sensor and optimize the anti-shake effect.

Description

Technical Field

[0001] The present application relates to the field of camera devices, and in particular to a sensor drive motor structure and a camera module. Background Art

[0002] At present, the OIS optical image stabilization solution for mobile phone camera stabilization is achieved by driving the lens through the VCM motor for angle correction. However, such solutions have long had the disadvantages of high power consumption, limited anti-shake effect, large product size, and high unit price. As the scenes of mobile phone photography become more and more abundant, the demand for anti-shake is also increasing. In other words, it is inevitable to improve the shooting effect of smartphones in the scene of sports photography. In addition, the terminal brands are increasingly strict in controlling the cost of component products. The main reason why OIS has not been popularized on some affordable mobile phones is that the cost is too high. Finally, since the VCM motor (voice coil motor) product of the OIS function is large in size, it is contrary to the terminal brand's demand for a thin and light appearance of the whole machine, and the Sensor-Shift technology can just avoid this problem. However, in addition to adding some more precise parts, the assembly process of the Sensor-Shift technology is also more complicated than the traditional one. As the market is increasingly pursuing thinness and lightness, and the structure of the camera component strives to be simple, it is extremely important to ensure the accuracy of the anti-shake movement while providing stable support for the image sensor. Summary of the invention

[0003] In order to solve the problem in the prior art that the sensor displacement anti-shake mechanism pursues a simple and thin structure but has difficulty in taking into account the anti-shake accuracy, the present application provides a sensor drive motor structure that enables the image sensor to perform more precise anti-shake movement while ensuring structural simplicity and camera module.

[0004] In order to achieve the above purpose, the technical solution adopted in this application is:

[0005] A sensor drive motor structure drives an image sensor to perform anti-shake movement, including magnets that are respectively connected to the image sensor and arranged on the outside of the four side surfaces and two ends of a diagonal of the image sensor, and coils are arranged on the outside of the magnets in a one-to-one correspondence, and the coils are conductively connected to an external circuit through a ring-shaped circuit board.

[0006] The driving motor structure in this solution is based on the Sensor-Shift technology. The Sensor-Shift technology is a new camera anti-shake technology. The shaking during shooting will cause unclear image imaging. The main components that affect the camera effect in the camera module are the camera and the image sensor. Most of the existing anti-shake technologies control the lens to move in the opposite direction of the shaking, while the Sensor-Shift technology controls the image sensor to perform anti-shake movement to offset the shaking during shooting. In the prior art, the magnets in the motor that drives the image sensor to move mainly have two distribution conditions: symmetrical and asymmetrical relative to the image sensor. Each group of magnet coils can be used to drive the image sensor to move in translation or rotation. The specific movement mode of the image sensor depends on the coordination of all coils and magnets. Therefore, the control of the current size and direction of each coil is relatively complex. The more precise the motion drive, the more complex the algorithm required to control. This solution arranges magnets at different positions outside the image sensor, which makes it easier to divide the image sensor's anti-shake movement into different dimensions, and use each or each group of magnets to drive the image sensor to move in different dimensions. For example, the magnets distributed on the diagonal line can provide torque by taking advantage of their position, which is dedicated to the rotational movement of the image sensor, while the other magnets distributed outside the four sides of the image sensor are dedicated to driving the translational movement. Therefore, a more refined division of labor is conducive to simplifying the control of the software algorithm, while also improving the accuracy of the image sensor's anti-shake movement.

[0007] Furthermore, the magnets on the outer sides of the four sides of the image sensor are translation magnets, and the magnets on the outer sides of the two diagonal ends of the image sensor are rotation magnets. When viewed from the optical axis, the side of the rotation magnet close to the coil has two different levels on the left and right. This solution uses the magnets distributed on the diagonal position of the image sensor as rotation magnets, and uses their position advantage to control the rotation of the image sensor, thereby making the division of labor of the internal parts of the motor more refined.

[0008] Furthermore, the magnet is fixed on a magnet bracket, and the magnet bracket is fixedly connected to the image sensor.

[0009] A shaky camera module includes the sensor drive motor structure in the above scheme, and also includes a support assembly for installing and supporting the movement of the image sensor, wherein the support assembly always provides a support base point located at the center of gravity of the image sensor. Based on the above scheme, this scheme further defines the motion support structure of the image sensor, using the support base point to support the movement of the image sensor, avoiding sensor displacement deviation caused by insufficient support, and ensuring the stability of the image sensor movement. The always-present support base point ensures that no matter how the image sensor moves, its center of gravity is supported by a stable and flexible support force.

[0010] Furthermore, the support assembly includes a hard circuit board that fits the bottom surface of the image sensor, and the side surface of the hard circuit board is connected to the flexible circuit board through an elastic arm; the support base point is provided by a limit buckle fixedly connected to the bottom surface of the hard circuit board, and a support ball pin that contacts and cooperates with the limit buckle. The support ball pin with a spherical surface contacts and cooperates with the limit buckle, and the support ball pin transmits the support force upward through the limit buckle from the contact position between the two. At the same time, the spherical surface of the support ball pin ensures that no matter how the limit buckle moves with the hard circuit board, it can maintain contact with the surface of the support ball pin and provide support force through contact.

[0011] Furthermore, the support assembly also includes an upper cover and a lower cover that are interlocked to form a cavity, the supporting ball pin and the flexible circuit board are fixedly connected to the lower cover, there is a gap between the hard circuit board and the elastic arm and the lower cover, and the annular circuit board is connected to the flexible circuit.

[0012] Furthermore, the center of the top surface of the upper cover is hollowed out, and the image sensor is aligned with the hollowed out portion.

[0013] Furthermore, it also includes an AF motor connected to the image sensor through a pin and arranged above the image sensor, and a lens facing the image sensor is installed in the AF motor. Combined with the arrangement of the upper cover and the lower cover in the above scheme, this scheme directly combines the lens and the AF motor and installs them above the image sensor, and the image sensor as a whole is actually located in the space where the upper cover and the lower cover are buckled. The arrangement of the upper cover separates the lens, the AF motor and the mechanism that supports and controls the movement of the image sensor, so that the module for adjusting the focal length of the lens and the module for moving the image sensor are independent of each other. When carrying out process production, image sensors and AF motors of different specifications can be arbitrarily matched, which is conducive to improving production capacity.

[0014] The beneficial effect of the present application is as follows: in the motor used to drive the movement of the image sensor in the present application, magnets located on the sides of the image sensor and rotating magnets located at both ends of the diagonal are arranged, and the two groups of magnets play different roles, so that the functional modules in the motor are further refined while adding very few parts and ensuring the simplicity of the structure. This not only simplifies the software algorithm for controlling the current size of each coil, but also utilizes a motor with a finer division of labor to achieve more precise driving of the image sensor and optimize the anti-shake effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present application;

[0017] Figure 2 It is a schematic diagram of the structure after the upper cover is separated in this application;

[0018] Figure 3 It is a schematic diagram of the overall structure decomposition of this application;

[0019] Figure 4 is a top view showing the distribution of the image sensor, magnet and coil in the present application;

[0020] Figure 5 It is a three-dimensional schematic diagram of the distribution of the image sensor, magnet and coil in this application;

[0021] Figure 6 It is a three-dimensional schematic diagram of the distribution of magnets and coils in this application;

[0022] Figure 7 It is a schematic diagram of the structure of the flexible circuit board, the elastic arm and the rigid circuit board in the present application;

[0023] Figure 8 It is a schematic diagram of the exploded structure of the limit buckle, support ball pin and lower cover in this application.

[0024] In the figure: 1-lens; 2-AF motor; 3-upper cover; 4-coil; 5-ring circuit board; 6-magnet; 601-translation magnet; 602-rotation magnet; 7-magnet bracket; 8-image sensor; 9-flexible circuit board; 10-elastic arm; 11-hard circuit board; 12-limiting buckle; 13-support ball pin; 14-lower cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] like Figure 4 and 6 A sensor drive motor structure is shown, which drives the image sensor 8 to perform anti-shake movement, including magnets 6 which are respectively connected to the image sensor 8 and arranged on the outside of the four side surfaces and two ends of a diagonal of the image sensor 8. Coils 4 are correspondingly arranged on the outside of the magnets 6, and the coils 4 are conductively connected to the external circuit through the annular circuit board 5.

[0033] Here’s how it works:

[0034] In this embodiment, the image sensor 8 is driven to be connected with the magnet 6 in a transmission manner. The movement principle is to use the magnetic field generated by the coil 4 after being energized to cause the movement of the magnet 6. The movement of the magnet 6 drives the image sensor 8 to perform anti-shake movement. It is worth noting that, since there are jitters in various postures when performing anti-shake photography, each magnet 6 has a different movement trajectory in different postures. Therefore, although the coils 4 in this application are connected to the external circuit after being connected in series by the annular circuit board 5 in appearance, in fact, the coils 4 are neither connected in series nor in parallel, but each coil 4 is in a separate circuit, so that the software algorithm can control the magnitude and direction of the current passing through each coil 4 separately.

[0035] Embodiment 2:

[0036] This embodiment is further optimized and limited based on the embodiment 1.

[0037] like Figure 4-6 As shown, the magnets 6 on the outside of the four sides of the image sensor 8 are translation magnets 601, and the magnets 6 on the outside of the two diagonal ends of the image sensor 8 are rotation magnets 602. When viewed from the optical axis, the side of the rotation magnet 602 close to the coil 4 has two different levels on the left and right. The magnets 6 are fixed on the magnet bracket 7, and the magnet bracket 7 is fixedly connected to the image sensor 8.

[0038] When in use, this embodiment divides the six magnets 6 into two groups that play different functions respectively. The rotating magnets 602 distributed at both ends of the diagonal of the image sensor 8 provide torque to rotate the image sensor 8, and the magnets 6 distributed outside the four sides of the image sensor 8 are used to drive the image sensor 8 to perform translational motion. The coordination between the magnets 6 is simplified through more detailed functional grouping. Different magnets 6 play different roles in driving the image sensor 8 to move, which can not only simplify the software algorithm and improve the calculation speed, but also achieve more precise anti-shake movement through more detailed control.

[0039] Embodiment 3:

[0040] Based on the sensor drive motor structure in any of the above embodiments, this embodiment provides an anti-shake camera module, including the sensor drive motor structure in any of Embodiments 1 and 2, and also includes a support assembly for installing and supporting the movement of the image sensor 8, and the support assembly always provides a support base point located at the center of gravity of the image sensor 8.

[0041] Embodiment 4:

[0042] This embodiment is further limited on the basis of Embodiment 3, and provides a specific structural example of an anti-shake camera module.

[0043] like Figure 1-3As shown in Figure 8, the support assembly is composed of an upper cover 3 and a lower cover 14 that are interlocked to form a cavity to form a shell. The surface of the lower cover 14 is fixedly connected to the support ball pin 13. The bottom surface of the flexible circuit board 9 is fixedly connected to the surface of the lower cover 14. The flexible circuit board 9 is in a frame shape. The rigid circuit board 11 is connected to the frame through an elastic arm 10. The bottom surface of the rigid circuit board 11 is fixedly connected to a limit buckle 12 that cooperates with the support ball pin 13. The limit buckle 12 is aligned with the center of gravity of the image sensor 8. The cooperation of the limit buckle 12 and the support ball pin 13 constitutes a support base point. The annular circuit board 5 is conductively connected to the flexible circuit board 9. At the same time, in the present application, the elastic arm 10 and the rigid circuit board 11 maintain a gap with the lower cover 14. The gap ensures that the rigid circuit board 11 has a certain activity space when moving with the image sensor 8.

[0044] At the same time, in the present application, the center of the top surface of the upper cover 3 is hollowed out, and the image sensor 8 is aligned with the hollowed out portion. On the outside of the upper cover 3, an AF motor 2 is arranged above the image sensor 8, and a lens 1 facing the image sensor 8 is installed in the AF motor 2.

[0045] It is worth noting that, in combination with the magnet 6 and other structures in Examples 1-2, the magnet bracket 7 equipped with the magnet 6 is fixedly connected to the image sensor 8, and the coils 4 and the annular circuit board 5 corresponding to the magnets 6 are both located in the space where the upper cover 3 and the lower cover 14 are buckled together. The image sensor 8 as a whole is also actually located in the space where the upper cover 3 and the lower cover 14 are buckled together. The setting of the upper cover 3 separates the lens 1 and the AF motor 2 from the mechanism that supports and controls the movement of the image sensor 8, so that the module for adjusting the focal length of the lens 1 and the module for moving the image sensor 8 are independent of each other. During process production, image sensors 8 and AF motors 2 of different specifications can be arbitrarily matched, which is conducive to improving production capacity.

[0046] It is worth noting that the elastic arm 10 in this solution is a metal conductive material. In addition to providing support and resilience when the hard circuit board 11 moves with the image sensor 8, the elastic arm 10 also plays a role in connecting the hard circuit board 11 and the flexible circuit board 9. In terms of material selection, a flexible circuit board 9 made of multi-layer materials can be selected, so that the hard circuit board 11 is formed by removing the surface polymer, and then the surface polymer is removed and then cut to form the elastic arm 10. This setting method enhances the integrity and connection stability of the flexible circuit board 9, the elastic arm 10 and the hard circuit board 11, and simplifies the overall structure.

[0047] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An anti-shake camera module, comprising a sensor drive motor structure, characterized in that: It also includes a support assembly for mounting and supporting the movement of the image sensor (8), the support assembly always providing a support base point located at the center of gravity of the image sensor (8); the sensor drive motor structure includes magnets (6) respectively connected to the image sensor (8) in a transmission manner and arranged on the outside of four side surfaces and two ends of a diagonal of the image sensor (8), the outsides of the magnets (6) being provided with coils (4) in a one-to-one correspondence, and the coils (4) being conductively connected to an external circuit via a ring-shaped circuit board (5); The magnets (6) on the outside of the four side surfaces of the image sensor (8) are translation magnets (601), and the magnets (6) on the outside of the two diagonal ends of the image sensor (8) are rotation magnets (602). When viewed from the optical axis, the side of the rotation magnet (602) close to the coil (4) has two different left and right poles; The magnet (6) is fixed on a magnet bracket (7), and the magnet bracket (7) is fixedly connected to the image sensor (8).

2. The anti-shake camera module according to claim 1, characterized in that: The support assembly comprises a hard circuit board (11) attached to the bottom surface of the image sensor (8), and the side surface of the hard circuit board (11) is connected to the flexible circuit board (9) via an elastic arm (10); The support base point is provided by a limit buckle (12) fixedly connected to the bottom surface of the hard circuit board (11), and a support ball pin (13) in contact with and mating with the limit buckle (12).

3. The anti-shake camera module according to claim 2, characterized in that: The support assembly further comprises an upper cover (3) and a lower cover (14) which are interlocked to form a cavity, the support ball pin (13) and the flexible circuit board (9) are both fixedly connected to the lower cover (14), a gap is provided between the hard circuit board (11) and the elastic arm (10) and the lower cover (14), and the annular circuit board (5) is connected to the flexible circuit board.

4. The anti-shake camera module according to claim 3, characterized in that: The center of the top surface of the upper cover (3) is hollowed out, and the image sensor (8) is aligned with the hollowed out portion.

5. The anti-shake camera module according to claim 1, characterized in that: It also includes an AF motor (2) connected to the image sensor (8) via pins and arranged above the image sensor (8), wherein a lens (1) facing the image sensor (8) is installed in the AF motor (2).

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