Camera driving device and camera system

Abstract

The embodiment of the invention provides a camera driving device and a camera system, the driving device comprises a base, magnetic steel, a voice coil and a lens cone support movably arranged on the base, and the magnetic steel and the voice coil cooperate with each other to drive the lens cone support to move; the voice coil comprises at least two sub-voice coils arranged at intervals, and the magnetic steel comprises a plurality of first sub-magnetic steel and a plurality of second sub-magnetic steel arranged alternately with the first sub-magnetic steel. According to the camera driving device provided by the embodiment of the invention, the at least two spaced sub-voice coils are arranged, and the first sub-magnetic steel and the second sub-magnetic steel which are magnetized alternately in the radial direction and the axial direction are adopted, so that the magnetic field distribution is more uniform, the movement precision and the response speed of the lens cone bracket are remarkably improved, and meanwhile, a larger driving force is provided; long-stroke driving is supported, and power consumption is further reduced.

Description

Technical Field

[0001] Embodiments of the present invention belong to the technical field of camera driving, and particularly relate to a camera driving device and a camera system. Background Art

[0002] Traditional camera driving devices usually use a combination of a single voice coil and a magnet to drive the lens barrel bracket for autofocus and optical image stabilization. However, due to problems such as uneven magnetic field distribution, slow response speed, and high power consumption, it is difficult to meet the requirements of high-quality photography.

[0003] Existing improvement solutions such as optimizing the magnet layout have improved to some extent, but there are still deficiencies such as magnetic field interference and complex control. How to ensure a more uniform magnetic field distribution, thereby significantly improving the movement accuracy and response speed of the lens barrel bracket, while providing a greater driving force to support long-stroke driving and further reducing power consumption to improve its overall performance is still a difficult problem to be solved urgently. Summary of the Invention

[0004] Embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide a camera driving device and a camera system.

[0005] On the one hand, embodiments of the present invention provide a camera driving device. The driving device includes a base, a magnet, a voice coil, and a lens barrel bracket movably disposed on the base. One of the magnet and the voice coil is fixed to the base, and the other of the magnet and the voice coil is fixed to the lens barrel bracket. The magnet and the voice coil cooperate with each other to drive the lens barrel bracket to move. It is characterized in that the voice coil includes at least two spaced-apart sub-voice coils, the magnet includes a plurality of first sub-magnets and a plurality of second sub-magnets alternately arranged with the plurality of first sub-magnets. The first sub-magnets are magnetized along the radial direction of the lens barrel bracket, and the magnetization directions of two adjacent first sub-magnets are opposite. The second sub-magnets are magnetized along the axial direction of the lens barrel bracket, and the magnetization directions of two adjacent second sub-magnets are opposite. And the end of the first sub-magnet facing the voice coil has the same polarity as the end of the adjacent second sub-magnet facing the first sub-magnet.

[0006] Optionally, the first sub-magnets and the second sub-magnets are integrally formed.

[0007] Optionally, the first sub-magnets and the second sub-magnets are separately arranged sub-magnets.

[0008] Optionally, the lens barrel bracket includes a first bottom wall and two first side walls spaced apart from each other and connected to the first bottom wall. The first bottom wall and the two first side walls enclose a first receiving space for receiving the lens barrel.

[0009] The base includes a second bottom wall and two second side walls that are relatively spaced apart and connected to the second bottom wall. The second bottom wall and the two second side walls enclose a second accommodation space for accommodating the lens barrel bracket.

[0010] On one side of the first side wall facing the second side wall, the first sub-magnet and the second sub-magnet are fixed. On one side of the second side wall facing the first side wall, the sub-voice coil is fixed.

[0011] Optionally, the driving device further includes a rolling support member or a sliding support member disposed between the first bottom wall and the second bottom wall.

[0012] Optionally, the driving device further includes a magnetic conductive member fixed to the sides of the first sub-magnet and the second sub-magnet facing away from the voice coil.

[0013] Optionally, the driving device further includes an elastic member with two ends respectively connected to the base and the lens barrel bracket.

[0014] Optionally, the driving device further includes a housing that surrounds the base and the lens barrel bracket and is open at both ends along the axial direction of the lens barrel bracket.

[0015] Optionally, the driving device further includes a circuit board and a displacement sensor fixed to the base. The sub-voice coil is electrically connected to the circuit board, and a controller electrically connected to the displacement sensor is disposed on the circuit board.

[0016] The controller is configured to separately send electrical signals to each of the sub-voice coils according to the current position of the lens barrel bracket detected by the displacement sensor, so as to independently control each of the sub-voice coils to generate a magnetic field and cooperate with the first sub-magnet and the second sub-magnet to drive the lens barrel bracket to move along its axial direction until the lens barrel bracket reaches the target position.

[0017] On the other hand, an embodiment of the present invention provides a camera system, which includes a camera module and the camera driving device described above.

[0018] In the camera driving device and the camera system according to the embodiments of the present invention, by providing at least two spaced-apart sub-voice coils and using the first sub-magnet and the second sub-magnet with radially and axially alternating magnetization, it is ensured that the magnetic field distribution is more uniform, thereby significantly improving the movement accuracy and response speed of the lens barrel bracket. At the same time, a greater driving force is provided to support long-stroke driving, and the power consumption is further reduced. This design not only improves the overall performance but also is applicable to devices such as high-end smartphones and professional cameras to meet higher shooting requirements. Description of the Drawings

[0019] Figure 1Schematic diagram of the overall structure of a camera driving device according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 Schematic cross-sectional view along line A-A;

[0021] Figure 3 Schematic diagram of the cooperation of the voice coil, magnet, and magnetic conduction member of a conventional camera driving device;

[0022] Figure 4 Output force and displacement curve diagram of a conventional camera driving device;

[0023] Figure 5 Schematic diagram of the cooperation of the voice coil, magnet, and magnetic conduction member of the present invention;

[0024] Figure 6 Output force and displacement curve diagram of the camera driving device of the present invention, and comparison schematic diagram with the output force and displacement curves of a conventional camera driving device;

[0025] Figure 7 Exploded perspective view of the three-dimensional structure of a camera driving device of the present invention. Detailed implementation manners

[0026] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0027] As Figures 1 to 7 shown, a camera driving device 100, the driving device 100 includes a base 110, a magnet 120, a voice coil 130, and a lens barrel bracket 140 movably disposed on the base 110. One of the magnet 120 and the voice coil 130 is fixed to the base 110, and the other of the magnet 120 and the voice coil 130 is fixed to the lens barrel bracket 140. The magnet 120 and the voice coil 130 cooperate with each other to drive the lens barrel bracket 140 to move.

[0028] The voice coil 130 includes at least two spaced-apart sub-voice coils 131. The magnet 120 includes a plurality of first sub-magnets 121 and a plurality of second sub-magnets 122 alternately arranged with the plurality of first sub-magnets 121. The first sub-magnets 121 are magnetized along the radial direction of the lens barrel bracket 140, and the magnetization directions of two adjacent first sub-magnets 121 are opposite. The second sub-magnets 122 are magnetized along the axial direction of the lens barrel bracket 140, and the magnetization directions of two adjacent second sub-magnets 122 are opposite. Moreover, the end of the first sub-magnet 121 facing the voice coil 130 has the same polarity as the end of the adjacent second sub-magnet 122 facing the first sub-magnet 121.

[0029] Specifically, as Figures 1 to 7 shown, either the magnet 120 or the voice coil 130 can be fixed to the lens barrel bracket 140, and the other of the magnet 120 and the voice coil 130 is fixed to the base 110. Further, the voice coil 130 is set to at least two spaced sub-voice coils 131, and the magnet 120 is set to a plurality of first sub-magnets 121 and a plurality of second sub-magnets 122 alternately arranged with the plurality of first sub-magnets 121. It should be noted that the sum of the number of the first sub-magnets 121 and the second sub-magnets 122 is at least five.

[0030] As a specific example, reference can be made to Figure 5 and Figure 7 , where the first sub-magnet 121 is set to 4, and the second sub-magnet 122 is set to 3. The first sub-magnets 121 are magnetized along the radial direction of the lens barrel bracket 140 and the magnetization directions of two adjacent first sub-magnets 121 are opposite. The second sub-magnets 122 are magnetized along the axial direction of the lens barrel bracket 140 and the magnetization directions of two adjacent second sub-magnets 122 are opposite, and the end of the first sub-magnet 121 facing the voice coil 130 has the same polarity as the end of the adjacent second sub-magnet 122 facing the first sub-magnet 121.

[0031] For the camera driving device according to the embodiment of the present invention, by providing at least two spaced sub-voice coils and using the first sub-magnets and the second sub-magnets magnetized alternately in the radial and axial directions, it is ensured that the magnetic field distribution is more uniform, thereby significantly improving the movement accuracy and response speed of the lens barrel bracket, and at the same time, a greater driving force can be provided to support long-stroke driving, further reducing power consumption. This design not only improves the overall performance, but also is applicable to devices such as high-end smart phones and professional cameras to meet higher shooting requirements.

[0032] Exemplarily, as Figures 1 to 7 shown, the first sub-magnet 121 and the second sub-magnet 122 are integrally formed. That is, the magnet 120 is an integral magnet with different magnetization directions.

[0033] Exemplarily, as Figures 1 to 7 shown, the first sub-magnet 121 and the second sub-magnet 122 are separately arranged sub-magnets. As Figure 5 shown, both the first sub-magnet 121 and the second sub-magnet 122 are separately arranged sub-magnets, and the Halbach array magnetization method is used for magnetization. One sub-magnet is magnetized up and down, and one sub-magnet is magnetized left and right, arranged in sequence, and arranged in a form of rotating 90° in sequence.

[0034] Exemplarily, as Figures 1 to 7As shown, the lens barrel bracket 140 includes a first bottom wall 141 and two first side walls 142 that are relatively spaced apart and connected to the first bottom wall 141. The first bottom wall 141 and the two first side walls 142 enclose a first accommodation space 200 for accommodating a lens barrel (a camera, not shown in the figure). The base 110 includes a second bottom wall 111 and two second side walls 112 that are relatively spaced apart and connected to the second bottom wall 111. The second bottom wall 111 and the two second side walls 112 enclose a second accommodation space 300 for accommodating the lens barrel bracket 140.

[0035] On one side of the first side wall 142 facing the second side wall 112, the first sub-magnet 121 and the second sub-magnet 122 are fixed. On one side of the second side wall 112 facing the first side wall 142, the voice coil 131 is fixed.

[0036] Specifically, as Figures 1 to 7 shown, on two opposite sides of the first side wall 142 and the second side wall 112, the first sub-magnet 121, the second sub-magnet 122, and the voice coil 131 are respectively fixed. When the voice coil 131 is energized to generate a magnetic field, it can drive the lens barrel bracket 140 to move axially in cooperation with the first sub-magnet 121 and the second sub-magnet 122. Referring together to Figure 5 and Figure 6 , Figure 6 The left side view is a graph of the output force and displacement that can be provided by each of the two voice coils 131 when there are two voice coils 131, four first sub-magnets 121, and three second sub-magnets 122. Figure 6 The relationship between the output force and displacement of the structure of the present invention in the right side view is the total output force and displacement curve of the camera driving device of the present invention obtained by adding the absolute values of the output forces of the two voice coils 131 in the left side view.

[0037] Referring together to Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the cooperation of the voice coil 130', the magnet 120', and the magnetic conductive member 160' in a traditional camera driving device. In the traditional camera driving device, by providing one voice coil 130', the magnet 120' is set as two separate sub-magnets 121', and a magnetic conductive member 160' is provided on the side of the magnet 120' facing away from the voice coil 130'. Both of the two sub-magnets 121' are magnetized in the radial direction of the lens barrel bracket and the magnetization directions are opposite. The above traditional structure is used to drive the lens barrel bracket. Figure 6 The relationship between the output force and displacement of the traditional structure in the right side view is Figure 4 the same as Figure 3 the output force and displacement curves of the traditional camera driving device obtained by driving using the

[0038] It should be noted that Figure 4 and Figure 6 are both the output force and displacement curve relationships obtained under the condition that the magnetic circuit volumes of the traditional camera driving device and the camera driving device of the present invention are the same. Obviously, referring continuously to Figures 3 to 6 , under the condition of the same magnetic circuit volume, both the output force and displacement of the camera driving device 100 of the present invention are superior to those of the traditional camera driving device. That is, the camera driving device 100 of the present invention can ensure a more uniform magnetic field distribution, thereby significantly improving the movement accuracy and response speed of the lens barrel bracket, and at the same time providing a greater driving force to support long-stroke movement. The camera driving device of the present invention has a greater driving force and stroke area compared to the traditional camera driving device.

[0039] Exemplarily, as Figures 1 to 7 shown, the driving device 100 further includes a circuit board fixed to the base 110 and a displacement sensor 190. The voice coil 131 is electrically connected to the circuit board, and a controller electrically connected to the displacement sensor 190 is provided on the circuit board.

[0040] The controller is configured to separately send electrical signals to each of the voice coils 131 according to the current position of the lens barrel bracket 140 detected by the displacement sensor 190, so as to independently control each of the voice coils 131 to generate a magnetic field and cooperate with the first sub-magnet 121 and the second sub-magnet 122 to drive the lens barrel bracket 140 to move axially until the lens barrel bracket 140 reaches the target position.

[0041] Specifically, as Figure 2 and Figure 7 shown, the displacement sensor 190 can be disposed on the side of the second sidewall 112 facing the first sidewall 142, and further can be located in the inner region of the coil formed by enclosing any one of the voice coils 131.

[0042] The displacement sensor 190 is configured to detect the current position of the lens barrel bracket 140 and send the current position to the controller. When the circuit board is powered on, the controller separately sends electrical signals to each voice coil 131 according to the detected current position, so as to independently control each voice coil 131 to generate a magnetic field and cooperate with the first sub-magnet 121 and the second sub-magnet 122 to drive the lens barrel bracket 140 to move axially until the lens barrel bracket 140 reaches the target position and then stops. Of course, a separate drive power amplifier can also be provided between the controller and each voice coil 131, and each electrical signal sent by the controller is first amplified by the corresponding drive power amplifier and then sent to each corresponding voice coil 131.

[0043] Exemplarily, as Figures 1 to 7As shown, the driving device 100 further includes a rolling support or a sliding support 150 disposed between the first bottom wall 141 and the second bottom wall 111.

[0044] As a specific example, as Figure 1 , Figure 2 and Figure 7 shown, a receiving groove 113 is provided on the second bottom wall 111. The receiving groove 113 is used to place the sliding support 150 to facilitate the sliding movement of the lens barrel bracket 140 relative to the base 110. Exemplarily, the sliding support 150 can be set as a sliding shaft. Of course, a rolling support can also be placed in the receiving groove 113 to facilitate the rolling movement of the lens barrel bracket 140 relative to the base 110, and the rolling support can be set as a ball.

[0045] Exemplarily, as Figure 2 and Figure 5 shown, the driving device 100 further includes a magnetic conductive member 160 fixed to the sides of the first sub-magnet 121 and the second sub-magnet 122 facing away from the voice coil 130. The provision of the magnetic conductive member can effectively reduce magnetic field interference and improve the performance and reliability of the driving device.

[0046] Further, as Figure 2 and Figure 7 shown, a clamping groove 1421 is formed on the side of the first side wall 142 facing the second side wall 112. The clamping groove 1421 is used to accommodate and fix the magnetic conductive member 160, the first sub-magnet 121, and the second sub-magnet 122.

[0047] Exemplarily, as Figure 1 , Figure 2 and Figure 7 shown, the driving device 100 further includes an elastic member 170 with two ends respectively connected to the base 110 and the lens barrel bracket 140. The provided elastic member 170 can further provide a restoring force for the lens barrel bracket 140 during the movement of the lens barrel bracket 140. The elastic member 170 can be set as a polymer film.

[0048] Further, the driving device 100 further includes a housing 180 surrounding the base 110 and the lens barrel bracket 140 and having openings at both ends along the axial direction of the lens barrel bracket 140. Through the provided housing 180, both the internal parts can be protected and the movement of the lens barrel bracket 140 is facilitated.

[0049] On the other hand, the present invention also provides a camera system, which includes a camera module and the aforementioned camera driving device 100. The specific structure of the camera driving device 100 can refer to the relevant records above and will not be elaborated here.

[0050] The camera driving device and camera system according to the embodiments of the present invention, by setting at least two spaced sub voice coils and adopting the first sub magnet and the second sub magnet with alternating radial and axial magnetization, ensure that the magnetic field distribution is more uniform, thereby significantly improving the movement accuracy and response speed of the lens barrel bracket, while providing a greater driving force to support long-stroke driving and further reducing power consumption. This design not only improves the overall performance, but also is applicable to devices such as high-end smart phones and professional cameras to meet higher shooting requirements.

[0051] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, however, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A camera driving device, the driving device comprising a base, a magnet, a voice coil, and a lens barrel bracket movably disposed on the base, one of the magnet and the voice coil being fixed to the base, the other of the magnet and the voice coil being fixed to the lens barrel bracket, the magnet and the voice coil cooperating with each other to drive the lens barrel bracket to move; characterized in that, The voice coil includes at least two sub-voice coils arranged at intervals, the magnetic steel includes a plurality of first sub-magnets and a plurality of second sub-magnets arranged alternately with the plurality of the first sub-magnets, the first sub-magnets are magnetized along the radial direction of the lens barrel bracket and the magnetization directions of two adjacent first sub-magnets are opposite, the second sub-magnets are magnetized along the axial direction of the lens barrel bracket and the magnetization directions of two adjacent second sub-magnets are opposite, and the polarity of one end of the first sub-magnet facing the voice coil is the same as that of one end of the adjacent second sub-magnet facing the first sub-magnet.

2. The camera driving device according to claim 1, wherein The first sub-magnetic steel and the second sub-magnetic steel are integrally formed.

3. The camera driving device according to claim 1, wherein The first sub-magnetic steel and the second sub-magnetic steel are sub-magnetic steels arranged separately.

4. The camera driving device according to any one of claims 1 to 3, characterized in that, The lens barrel bracket comprises a first bottom wall and two first side walls which are spaced apart from each other and connected to the first bottom wall, wherein the first bottom wall and the two first side walls form a first receiving space for receiving the lens barrel; The base comprises a second bottom wall and two second side walls which are spaced apart from each other and connected to the second bottom wall, wherein the second bottom wall and the two second side walls form a second receiving space for receiving the lens barrel bracket; The first sub-magnetic steel and the second sub-magnetic steel are fixed to a side of the first side wall facing the second side wall, and the sub-voice coil is fixed to a side of the second side wall facing the first side wall.

5. The camera driving device according to claim 4, wherein, The driving device further includes a rolling support member or a sliding support member disposed between the first bottom wall and the second bottom wall.

6. The camera driving device according to claim 4, characterized in that, The driving device further includes a magnetic conductive member fixed to a side of the first sub-magnetic steel and the second sub-magnetic steel away from the voice coil.

7. The camera driving device according to any one of claims 1 to 3, characterized in that, The driving device also includes an elastic member with two ends respectively connected to the base and the lens barrel bracket.

8. The camera driving device according to any one of claims 1 to 3, characterized in that, The driving device also includes a shell which is arranged around the base and the lens barrel support and has openings at both ends along the axial direction of the lens barrel support.

9. The camera driving device according to any one of claims 1 to 3, characterized in that, The driving device further comprises a circuit board and a displacement sensor fixed to the base, the sub-voice coil is electrically connected to the circuit board, and a controller electrically connected to the displacement sensor is arranged on the circuit board; The controller is used to send electrical signals to each sub-voice coil separately according to the current position of the lens barrel bracket detected by the displacement sensor, so as to independently control each sub-voice coil to generate a magnetic field and cooperate with the first sub-magnet and the second sub-magnet to drive the lens barrel bracket to move along its axial direction until the lens barrel bracket reaches the target position.

10. A camera system, characterized in that, The camera system comprises a camera module and a camera driving device as described in any one of claims 1 to 9.

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