A four-axis anti-shake voice coil motor for micro cameras

Abstract

The present invention discloses a four-axis anti-shake voice coil motor for a micro camera, comprising: a three-axis anti-shake voice coil motor, a sealing carrier, and a single-axis rotating anti-shake voice coil motor. The three-axis anti-shake voice coil motor contains a moving part group, one of which controls two degrees of freedom in the horizontal direction, and the other controls one degree of freedom in the vertical direction. The sealing carrier is used to connect the three-axis anti-shake voice coil motor and the single-axis rotating anti-shake voice coil motor, and can seal the path of the incident light to prevent stray light and foreign matter from affecting the imaging of the photosensitive chip. The single-axis rotating anti-shake voice coil motor contains a moving part for carrying the photosensitive chip, and the moving part rotates along the vertical axis under the traction of the bottom control drive. Under the premise of realizing the traditional motor focusing, the present invention adds anti-shake of two degrees of freedom in the horizontal direction and anti-shake of rotation along the vertical axis, so that the photosensitive chip becomes stable during imaging, and the photo-taking ability of the mobile device is effectively improved.

Description

Technical Field

[0001] The patent of this invention relates to the field of voice coil motor technology, and in particular to a four-axis anti-shake voice coil motor for a miniature camera in a mobile device. Background Art

[0002] Since the voice coil motor (VCM) has the advantages of simple structure, small size, low energy consumption, no noise, high acceleration, fast response speed, precise displacement and low price, the automatic focusing function of the voice coil motor is still the most cost-effective solution for the automatic focusing device of the camera. By fixing the optical lens on the voice coil motor drive carrier, the carrier serves as the power unit for the movement of the lens, and connecting the voice coil motor carrier and the housing through an elastic structure, when the motor is powered on, the carrier will move linearly along the optical axis of the lens, thereby realizing the automatic focusing function.

[0003] Since the existing anti-shake solutions for mobile camera equipment can only balance the jitter in the horizontal direction, high-end camera equipment only achieves three-axis anti-shake by adding vertical jitter balance. When the mobile terminal is actually shooting, in addition to the jitter along the two horizontal axes and the one vertical axis, the camera will also rotate around the vertical axis, that is, rotate around the optical axis. At this moment, although the image at the center can maintain a certain clarity, the image on the outside will be blurred due to the rotation. How to deal with the blurred image caused by jitter and rotation in all directions during shooting has become a difficult problem that needs to be solved urgently for mobile cameras. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing technology cannot eliminate the problem of image blur caused by shaking and rotation in multiple directions. A four-axis anti-shake voice coil motor for a micro camera is provided.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A four-axis anti-shake voice coil motor for a micro camera, comprising: a three-axis anti-shake voice coil motor (1), a sealing bearing (2), and a single-axis rotation anti-shake voice coil motor (3);

[0007] An imaging lens is fixed inside the inner circle of the three-axis anti-shake voice coil motor (1); the three-axis anti-shake voice coil motor (1) is assembled and bonded to the sealing carrier (2);

[0008] The sealing carrier (2) and the single-axis rotation anti-shake voice coil motor (3) are combined and bonded together to form a four-axis anti-shake voice coil motor.

[0009] Preferably, a light-through hole (5) is provided in the middle of the sealing carrier (2), and an avoidance groove (4) is provided at the bottom, and the avoidance groove (4) is interlocked and bonded with an external connecting plate (6) on the single-axis rotating anti-shake voice coil motor (3); the sealing carrier (2) is used to support the three-axis anti-shake voice coil motor (1).

[0010] Preferably, the single-axis rotation anti-shake voice coil motor (3) mainly comprises an external connection plate (6), a chip connection flexible circuit board (8), a chip carrier (9), a base (15), and a driving magnet (17);

[0011] The external connection plate (6) is connected to the chip carrier (9) via the chip connection flexible circuit board (8); the chip carrier (9) and the base (15) are interlocked.

[0012] Preferably, the photosensitive chip (7) is welded on the surface of the chip carrier (9) for imaging data acquisition; the chip connection flexible circuit board (8) has an "L"-shaped multiple bending structure, one end of which is welded on the chip carrier (9) and the other end is welded on the external connection board (6); the chip connection flexible circuit board (8) provides a restraining force to the chip carrier (9) to ensure that the chip carrier (9) does not rotate when the drive coil (14) is not energized.

[0013] Preferably, at least three groups of ball slide rails (11) are provided on the base (15) to ensure that the chip carrier (9) is not easily eccentric when twisted, the chip carrier (9) and the base (15) are interlocked, the ball slide rail (16) provided on the back of the chip carrier (9) is interlocked with the ball slide rail (11), and a ball (13) is provided between the ball slide rail (16) and the ball slide rail (11) to support and constrain the chip carrier (9) so that it can stably rotate around the center of the slide rail.

[0014] Preferably, a plurality of adsorption plates (12) are bonded to the base (15), at least two groups of drive coils (14) are provided on the base (15) and bonded to the adsorption plates (12), and a drive magnet (17) is provided on the back side of the chip carrier (9) corresponding to the drive coil (14); when the drive coil (14) is energized, a drive force is applied to the drive magnet (17), and the chip carrier (9) overcomes the restraining force generated by the chip connection flexible circuit board (8) under the traction force of the drive magnet (17), and the chip carrier (9) performs a rotational motion around the center of the slide rail.

[0015] Preferably, when the driving coil (14) is not energized, the driving magnet (17) will be attracted to the adsorption plate (12), and a ball (13) is provided between the chip carrier (9) and the base (15). At this time, the attraction force generated by the driving magnet (17) will be balanced with the supporting force provided by the ball (13), thereby preventing the ball (13) from detaching from the ball slide rail 1 (11) and the ball slide rail 2 (16), thereby providing constraints on the chip carrier (9), so that the chip carrier (9) remains stable and is not prone to displacement.

[0016] Preferably, a sensor element (10) is provided on the base (15), and the element (10) is used to detect the angle of rotation of the photosensitive chip (7) driven by the chip carrier (9), convert the detected angle into an electrical signal, and adjust the current change of the driving coil (14) through the transmission of the electrical signal, so that the photosensitive chip (7) accurately reaches the required rotation angle, thereby realizing a closed-loop control function.

[0017] Preferably, the three-axis anti-shake voice coil motor can realize the movement of the imaging lens in the horizontal X and Y directions, and can also realize the motion mode of rotation along the rotation axis, and can reach a state of 360 degrees tilted about the Z axis. During the imaging process, the deviation caused by the movement of the shooting end will be reversely compensated by the moving parts group according to the direction of the deviation under the action of the driving force, thereby realizing three-axis anti-shake.

[0018] The beneficial effects of the present invention are:

[0019] The present invention can balance the jitter of two axes in the horizontal direction and one axis in the vertical direction through a single-axis rotating anti-shake voice coil motor and a three-axis anti-shake voice coil motor, and adds an anti-shake solution rotating around the vertical axis, so that the motor can perform corresponding jitter compensation in the horizontal direction, vertical direction or vertical rotation direction, thereby achieving the purpose of four-axis anti-shake, making the mobile camera clearer and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the sealing bearing member in the present invention.

[0022] Figure 3 This is an exploded view of the structure of the single-axis rotation anti-shake voice coil motor in the present invention.

[0023] Figure 4 It is a rear view of the chip carrier of the single-axis rotation anti-shake voice coil motor in the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the following Figure 1-4The accompanying drawings further illustrate the present invention in detail. It should be understood that the specific implementation examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 As shown: A four-axis anti-shake voice coil motor for a micro camera, including a three-axis anti-shake voice coil motor 1, a sealing carrier 2, and a single-axis rotation anti-shake voice coil motor 3. The three-axis anti-shake voice coil motor 1 fixes the imaging lens in the inner circle of the three-axis anti-shake voice coil motor 1 by locking and bonding. The three-axis anti-shake voice coil motor 1 can realize the jitter compensation of the motor in the horizontal direction of 2 axes and the vertical direction of 1 axis. Then the three-axis anti-shake voice coil motor 1 is assembled on a sealing carrier 2 and hardened after being treated with glue. Finally, the assembly is assembled with the single-axis rotation anti-shake voice coil motor 3, and the single-axis rotation anti-shake voice coil motor 3 realizes the jitter compensation of the vertical rotation axis. After being hardened by glue treatment, the three constitute a four-axis anti-shake voice coil motor for a micro camera. The specific structure of the three-axis anti-shake voice coil motor 1 The applicant has applied for a patent on March 22, 2020, and the patent application number is: 202010204762.9. This application does not discuss this structure.

[0026] like Figure 2 As shown: the sealing carrier 2 is provided with a light hole 5 in the middle and an avoidance groove 4 at the bottom, which is interlocked and bonded with the external connection plate 6 on the single-axis rotation anti-shake voice coil motor 3. It is used to connect the three-axis anti-shake voice coil motor 1 and the single-axis rotation anti-shake voice coil motor 3, and can seal the route of the incident light to prevent stray light and foreign matter from affecting the imaging of the photosensitive chip.

[0027] like Figure 3 , as shown in Figure 4: the single-axis rotation anti-shake voice coil motor 3 is characterized by: an external connecting plate 6, a photosensitive chip 7, a chip connected flexible circuit board 8, a chip carrier 9, a sensor element 10, a ball guide rail 1 11, an adsorption plate 12, a ball 13, a driving coil 14, a base 15, a ball guide rail 2 16, and a driving magnet 17.

[0028] The photosensitive chip 7 is welded on the surface of the chip carrier 9 for imaging data collection. One side of the chip connection flexible circuit board 8 is welded on the chip carrier 9, and the other side is welded on the external connection board 6, so that the imaging collection data of the photosensitive chip 7 can establish communication with the mobile terminal device; at the same time, because the chip connection flexible circuit board 8 has a specific "L"-shaped multiple bending structure, it will provide a constraint force to the chip carrier 9 to ensure that the chip carrier 9 will not rotate when the drive coil 14 is not powered.

[0029] At least three sets of ball slides 11 are provided on the base 15 to ensure that the chip carrier 9 is not easily eccentric when twisted. When the chip carrier 9 is interlocked with the base 15, the ball slide 2 16 on the other side of the chip carrier 9 is interlocked with the ball slide 11, and a ball 13 is provided in the middle to support and constrain the chip carrier 9. Multiple sets of adsorption plates 12 are bonded on the base 15, and at least two sets of driving coils 14 are glued to the adsorption plates 12, and multiple sets of driving magnets 17 are bonded to the corresponding positions of the chip carrier 9. When the driving coils 14 are not energized, the driving magnets 17 will be attracted to the adsorption plates 12, and the balls 13 are provided between the chip carrier 9 and the base 15. At this time, the attraction of the driving magnets 17 and the support force provided by the balls 13 reach a balance, preventing the balls 13 from detaching from the ball slides 11 and the ball slides 2 16, thereby constraining the chip carrier 9, so that the chip carrier 9 remains stable and is not prone to displacement. When the driving coil 14 is energized, the chip carrier 9 overcomes the restraining force of the chip connected to the flexible circuit board 8 under the traction force of the driving magnet 17, so that the chip carrier 9 can stably rotate around the center of the slide rail.

[0030] The base 15 is provided with a sensor element 10, which is used to detect the angle of rotation of the photosensitive chip 7 driven by the chip carrier 9, convert the detected angle change into an electrical signal, and adjust the current of the driving coil 14 through the electrical signal transmission, so that the photosensitive chip 7 can accurately reach the required rotation angle, thereby realizing the closed-loop control function.

[0031] In addition, the chip connected to the flexible circuit board 8 can be directly welded on one side of the photosensitive chip 7 and on the other side of the external connecting board 6. Through the chip connected to the flexible circuit board 8, the imaging acquisition data of the photosensitive chip 7 can establish communication with the mobile device. The flexible circuit board 8 will provide a restraining force to the chip carrier 9 through the photosensitive chip 7 to ensure that the chip carrier 9 will not rotate when the driving coil 14 is not energized.

[0032] The technical principles of the present invention are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, those skilled in the art can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the scope of protection of the present invention.

Claims

1. A four-axis anti-shake voice coil motor for a miniature camera, characterized in that: include: A three-axis anti-shake voice coil motor (1), a sealing carrier (2), and a single-axis rotation anti-shake voice coil motor (3); an imaging lens is fixed in the inner circle of the three-axis anti-shake voice coil motor (1); the three-axis anti-shake voice coil motor (1) is assembled and bonded to the sealing carrier (2); the sealing carrier (2) and the single-axis rotation anti-shake voice coil motor (3) are combined and bonded together to form a four-axis anti-shake voice coil motor; The single-axis rotation anti-shake voice coil motor (3) mainly comprises an external connection plate (6), a chip connection flexible circuit board (8), a chip carrier (9), a base (15), and a driving magnet (17); the external connection plate (6) is connected to the chip carrier (9) through the chip connection flexible circuit board (8); the chip carrier (9) and the base (15) are interlocked; At least three groups of ball slide rails (11) are provided on the base (15) to ensure that the chip carrier (9) is not easily eccentric when twisted. The chip carrier (9) and the base (15) are interlocked. The ball slide rail (16) provided on the back of the chip carrier (9) is interlocked with the ball slide rail (11). A ball (13) is provided between the ball slide rail (16) and the ball slide rail (11) to support and constrain the chip carrier (9) so that the chip carrier (9) can stably rotate around the center of the slide rail. A plurality of groups of adsorption plates (12) are bonded to the base (15); at least two groups of drive coils (14) are provided on the base (15) and bonded to the adsorption plates (12); a drive magnet (17) is provided on the back side of the chip carrier (9) corresponding to the drive coil (14); when the drive coil (14) is energized, a drive force is applied to the drive magnet (17); the chip carrier (9) overcomes the restraining force generated by the chip connection flexible circuit board (8) under the traction force of the drive magnet (17), and the chip carrier (9) performs a rotational motion around the center of the slide rail.

2. A four-axis anti-shake voice coil motor for a miniature camera according to claim 1, characterized in that: A light-through hole (5) is provided in the middle of the sealing carrier (2), and an avoidance groove (4) is provided at the bottom. The avoidance groove (4) is interlocked and bonded with an external connection plate (6) on the single-axis rotation anti-shake voice coil motor (3); the sealing carrier (2) is used to support the three-axis anti-shake voice coil motor (1).

3. The four-axis anti-shake voice coil motor for a miniature camera according to claim 1, characterized in that: The photosensitive chip (7) is welded on the surface of the chip carrier (9) for collecting imaging data; the chip connection flexible circuit board (8) has an "L"-shaped multiple bending structure, one end of which is welded on the chip carrier (9) and the other end of which is welded on the external connection board (6); the chip connection flexible circuit board (8) provides a restraining force on the chip carrier (9) to ensure that the chip carrier (9) does not rotate when the driving coil (14) is not energized.

4. The four-axis anti-shake voice coil motor for a miniature camera according to claim 1, characterized in that: When the driving coil (14) is not energized, the driving magnet (17) will be attracted to the adsorption plate (12), and a ball (13) is provided between the chip carrier (9) and the base (15). At this time, the attraction force generated by the driving magnet (17) will be balanced with the support force provided by the ball (13), thereby preventing the ball (13) from detaching from the first ball slide rail (11) and the second ball slide rail (16), thereby providing constraints on the chip carrier (9), so that the chip carrier (9) remains stable and is not prone to displacement.

5. The four-axis anti-shake voice coil motor for a miniature camera according to claim 1, characterized in that: A sensor element (10) is provided on the base (15). The element (10) is used to detect the angle at which the chip carrier (9) drives the photosensitive chip (7) to rotate, convert the detected angle into an electrical signal, and adjust the current change of the driving coil (14) through the transmission of the electrical signal, so that the photosensitive chip (7) accurately reaches the required rotation angle, thereby realizing a closed-loop control function.

6. The four-axis anti-shake voice coil motor for a miniature camera according to claim 1, characterized in that: The three-axis anti-shake voice coil motor can realize the movement of the imaging lens in the horizontal X and Y directions, and can also realize the motion mode of rotation along the rotation axis, and can reach a state of 360 degrees tilted on the Z axis. In the process of shooting, the deviation caused by the movement of the shooting end will be reversely compensated by the moving parts group according to the direction of the deviation under the action of the driving force, thereby realizing three-axis anti-shake.

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