A lens driving device, a photographic device, and an electronic product

Abstract

The present invention discloses a lens driving device, a photographic device, and an electronic product. The key points of the technical solution are as follows: A lens driving device includes a stator assembly, a mover assembly, a first driving mechanism, and a second driving mechanism. The first driving mechanism and the second driving mechanism are respectively disposed on both sides of the mover assembly. The first driving mechanism includes a first magnet group disposed on the mover assembly, a first coil group corresponding to the first magnet group, and a first flexible plate connected to the stator assembly. The second driving mechanism includes a second magnet group disposed on a side wall of the mover assembly facing away from the first magnet group, a second flexible plate connected to the stator assembly, and a second coil connected to the second flexible plate and connected to the second magnet group. The present invention achieves an optimal optical axis, realizes high-precision control of Tilt, and has a simple structure and convenient installation.

Description

Technical Field

[0001] The present invention relates to the field of photographic equipment, and particularly to a lens driving device, a photographic device, and an electronic product. Background Art

[0002] Existing autofocus devices are all formed by combining a voice coil motor with a lens, an image sensor, and a circuit board in terms of cumulative height. Due to the increase in mobile phone pixels and the increasing requirement for thinner product height, bottlenecks have emerged in the use of existing technologies.

[0003] Lenses with large apertures and high pixels have relatively high overall optical heights, resulting in the inability of the existing cumulative product height to meet the requirements of ultra-thin mobile phone bodies. Therefore, a lens driving device structure needs to be used, which is arranged horizontally in the mobile phone and an optical conversion component is added. It consists of a lens driving device, a lens group, a prism, etc. Special optical triangular prisms are used to refract light into the lens group to achieve imaging.

[0004] Existing lens driving devices are composed of a combination of AF and OIS. Among them, the driving (coil + magnet) of AF and OIS is generally on one side of the lens barrel (mover). The coils and magnets of the AF part can be placed below or can be made on an FPC. Most of the shrapnel is on the upper end side or both sides of the mover. Moreover, due to the different designs of the shrapnel wrist structures, when the mover moves relative to the stator, it is inevitable to produce position deviations, resulting in low precision of Tilt control. And in current lens driving devices, the driving forms adopted are all realized by the cooperation of coils and magnets. The magnet cooperating with the coil is a magnet structure. When the Hall element detects the magnetic flux, detection errors will occur due to different magnetic fluxes at different positions.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above defects. Summary of the Invention

[0006] The objective of the present invention is to provide a lens driving device, a photographic device, and an electronic product, achieving an optimal optical axis, realizing high-precision control of Tilt, and having a simple structure and convenient installation.

[0007] The above technical object of the present invention is achieved by the following technical solutions: A lens driving device includes a stator assembly, a mover assembly, a first driving mechanism, and a second driving mechanism. The first driving mechanism and the second driving mechanism are respectively arranged on both sides of the mover assembly; the first driving mechanism includes two sets of first magnet groups arranged on the mover assembly, two sets of first coil groups respectively corresponding to the first magnet groups, and a first flexible board connected to the stator assembly and connected to the two sets of first coil groups. The two sets of first magnet groups are located on the same side sidewall of the mover assembly; the second driving mechanism includes a second magnet group arranged on the sidewall of the mover assembly facing away from the first magnet group, a second flexible board connected to the stator assembly, and a second coil connected to the second flexible board and connected to the second magnet group.

[0008] The further setting of the present invention is: The first magnet group includes at least 2 first magnets arranged in sequence, and the arrangement direction of the first magnets is set along the moving direction of the mover assembly. The magnetic pole of one side of the first magnet facing the first coil group is opposite to that of the first magnet on the other side.

[0009] In one embodiment: Three magnets are selected for the magnet group to make the linearity of the motor better. As shown in the appendix Figure 9 and Figure 10 , the first magnet group includes three first magnets arranged in sequence, and the arrangement direction of the three first magnets is set along the moving direction of the mover assembly. The magnetic pole of the first magnet in the middle facing the first coil group is opposite to that of the first magnets on both sides; the first coil group includes two adjacent first coils, and the two first coils are respectively located between the corresponding adjacent two first magnets.

[0010] The further setting of the present invention is: The second magnet group and the second coil are both set to two groups. The two groups of second magnet groups are located on the same side of the mover assembly and the arrangement direction is perpendicular to the moving direction of the mover assembly.

[0011] The further setting of the present invention is: The mover assembly includes a carrier and two springs respectively arranged at both ends of the carrier in the moving direction. The springs are connected to the stator assembly. The springs include an inner fixing part connected to the end face of the carrier, an outer fixing part connected to the stator assembly, and two cantilever parts connected between the inner fixing part and the outer fixing part. The two cantilever parts are symmetrically arranged on both sides of the inner fixing part.

[0012] The further setting of the present invention is: A jack for inserting a lens is provided on the end face of the carrier in the moving direction, and the inner fixing part is arranged in a ring shape to facilitate the loading of the lens.

[0013] A further arrangement of the present invention is that: the stator assembly includes a frame, a housing, and a driving FPC. The outer fixing portion is connected to the frame, and electrode terminals are introduced into the driving FPC. The housing can be an integral structure covering the frame. The housing can also be composed of an upper cover and a lower cover, and the upper cover and the lower cover surround and cover the frame.

[0014] A further arrangement of the present invention is that: a photographic device has the above-mentioned lens driving device.

[0015] A further arrangement of the present invention is that: an electronic product has the above-mentioned photographic device.

[0016] In summary, the present invention has the following beneficial effects:

[0017] Through the connection method in which the three first magnets are staggered from each other, the three magnets are adsorbed together. And by arranging two adjacent first coils, the magnetic force between the first coil group and the first magnet group is made more stable, the movement of the carrier is made more stable, and it is convenient to control the accuracy of the movement of the carrier.

[0018] The anti-shake effect on the carrier is achieved through the relative action between the second coil and the second magnet group.

[0019] When the three first magnets are adsorbed to each other and two sequentially arranged first coils are arranged, while realizing the stable movement of the driven carrier; due to the arrangement of the three first magnets, the detection element detects more magnetic fluxes, and through IC control and simulation, better linearity of current and stroke is obtained, improving the accuracy of controlling the movement of the carrier. In addition, by independently powering the detection elements corresponding to the bilateral first coil groups, the change in the angular position of the carrier can also be sensed, and the angular position change signal is transmitted to the IC element through the sensing element. The IC element independently controls the current of the first coil to balance the change in the angle, and then achieves the optimal optical axis, realizing the high-precision control of Tilt.

[0020] To avoid magnetic interference between the first driving mechanism and the second driving mechanism, the first magnet group and the second magnet group are arranged on both sides of the carrier, and the magnetic pole directions are arranged up and down to reduce the magnetic interference around. In addition, the magnetic interference between each other can be further blocked by the magnetic conductive sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded schematic diagram of Embodiment 1;

[0022] Figure 2 is a schematic diagram of Embodiment 1 with the housing and the frame hidden;

[0023] Figure 3 is a cross-section after the housing and the frame of Embodiment 1 are hidden Figure 1 ;

[0024] Figure 4 It is a cross-section view after the housing and the frame of Embodiment 1 are hidden. Figure 2 ;

[0025] Figure 5 It is a schematic diagram of the installation positions of the first coil group and the first magnet group;

[0026] Figure 6 It is an exploded schematic diagram of the first driving mechanism and the second driving mechanism;

[0027] Figure 7 It is a schematic diagram of the structure of the spring;

[0028] Figure 8 It is a schematic diagram of Embodiment 1;

[0029] Figure 9 It is a linear graph of current and lens moving stroke in the existing lens driving device. The three lines respectively represent the upward, horizontal, and downward states of the lens driving device;

[0030] Figure 10 It is a linear graph of current and lens moving stroke in the lens driving device of Embodiment 2. When the lens driving device is in the upward, horizontal, and downward states, there is no linear deviation between the current and the lens moving stroke.

[0031] The corresponding component names represented by the numbers in the figure: 1. Carrier; 2. Spring; 301. Inner fixing part; 302. Outer fixing part; 303. Cantilever part; 4. Frame; 5. Housing; 501. Upper cover; 502. Lower cover; 601. First flexible plate; 602. First magnet group; 603. First coil group; 604. First magnet; 605. First coil; 701. Second magnet group; 702. Second flexible plate; 703. Second coil; 704. OIS magnet; 8. Detection element; 9. Magnetic conduction sheet; 10. Jack. Detailed implementation manners

[0032] In order to make the technical means, creative features, achieved purposes, and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0033] Embodiment 1: As Figures 1 to 8 shown, a lens driving device proposed by the present invention includes a stator assembly, a rotor assembly, a first driving mechanism, and a second driving mechanism. The first driving mechanism and the second driving mechanism are respectively arranged on both sides of the moving direction of the rotor assembly. The first driving mechanism can be an AF driving mechanism, and the second driving mechanism can be an OIS driving mechanism.

[0034] Among them, the mover assembly includes a carrier 1 and two springs 2 respectively arranged at both ends of the carrier 1 in the moving direction. The springs 2 are connected to the stator assembly. The spring 2 includes an inner fixing part 301 connected to the end face of the carrier 1, an outer fixing part 302 connected to the stator assembly, and two cantilever parts 303 connected between the inner fixing part 301 and the outer fixing part 302. The two cantilever parts 303 are symmetrically arranged on both sides of the inner fixing part 301. The stator assembly includes a frame 4, a housing 5, and a driving FPC (not shown in the figure). Electrode terminals are introduced into the driving FPC. The outer fixing part 302 is connected to the frame 4. The housing 5 can be an integral structure covering the frame 4, or can be composed of an upper cover 501 and a lower cover 502. The upper cover 501 and the lower cover 502 surround and cover the frame 4. In this embodiment, the housing 5 is separately provided as the upper cover 501 and the lower cover 502. Among them, the outer fixing part 302 of the spring 2 is fixedly connected to the frame 4, and the carrier 1 is suspended relative to the frame 4.

[0035] The first driving mechanism includes two groups of first magnet groups 602 arranged on the same side of the carrier 1, two groups of first coil groups 603 corresponding to the first magnet groups 602 respectively, and a first flexible board 601 connected to the frame 4 and connected to the two groups of first coil groups 603. The first flexible board 601 can be an FPC board. The two groups of first magnet groups 602 are located on the same side wall of the carrier 1, and the two groups of first magnet groups 602 are symmetrically arranged on both sides of the center line of the carrier 1. The first flexible board 601 is made of a hard material. The first coil group 603 is electrically connected to the first flexible board 601, and after the first coil group 603 is energized, it acts with the first magnet group 602 to drive the first magnet group 602 and the carrier 1 to move relatively.

[0036] The second driving mechanism includes a second magnet group 701 arranged on the side wall of the carrier 1 facing away from the first magnet group 602, a second flexible board 702 connected to the frame 4, and a second coil 703 connected to the second flexible board 702 and connected to the second magnet group 701. The second flexible board 702 is made of a hard material, and the second coil 703 is fixedly electrically connected to the second flexible board 702. The second flexible board 702 can be an FPC board. The second coil 703 is located on the surface of the second flexible board 702 facing the second magnet group 701. And in this embodiment, both the second magnet group 701 and the second coil 703 are provided in two groups. The two groups of second magnet groups 701 are located on the same side of the carrier 1 and the arrangement direction is perpendicular to the moving direction of the mover, that is, the two groups of second magnet groups 701 and the two groups of first magnet groups 602 are located on the front and back side walls of the carrier 1, and the positions are relatively arranged. The anti-shake effect on the carrier 1 is realized by the relative action between the second coil 703 and the second magnet group 701.

[0037] In this embodiment, the first magnet group 602 includes three first magnets 604 arranged in sequence. The arrangement direction of the three first magnets 604 is set along the moving direction of the carrier 1. The magnetic pole of the middle first magnet 604 facing the first coil group 603 is opposite to that of the first magnets 604 on both sides, that is, the magnetic poles of the three first magnets 604 all face the first coil group 603, and the middle first magnet 604 is arranged in the reverse direction with the two adjacent first magnets 604. In addition, the length of the middle first magnet 604 is longer than that of the two adjacent first magnets 604. The first coil group 603 includes two adjacent first coils 605, and the two first coils 605 are respectively located between the corresponding adjacent two first magnets 604. Through the staggered connection mode of the three first magnets 604, the three magnets are adsorbed together, and by arranging two adjacent first coils 605, the magnetic force between the first coil group 603 and the first magnet group 602 is made more stable, the movement of the carrier 1 is made more stable, and it is convenient to control the movement accuracy of the carrier 1.

[0038] In the second driving mechanism, the second magnet group 701 includes two OIS magnets 704 arranged in sequence. The magnetic poles of the two OIS magnets 704 are opposite and face the second coil 703, and the arrangement direction of the two OIS magnets 704 is perpendicular to the moving direction of the carrier 1.

[0039] In this embodiment, further, two detection elements 8 corresponding to the two first coil groups 603 are installed on the first flexible board 601 (the detection element 8 can be a Hall element, which is a prior art and will not be elaborated). The detection element 8 is fixed on the surface of the first flexible board 601 facing away from the first coil group 603 and is electrically connected to the first flexible board 601, and the detection element 8 is arranged at the center position of one of the first coils 605 and accurately detects the magnetic flux. In addition, in this embodiment, if the lens driving device is an open-loop driving structure, the detection element may not be provided. If it is a closed-loop driving structure, one or two detection elements 8 can be provided. When the three first magnets 604 are adsorbed to each other and two adjacent first coils 605 are arranged to realize the stable movement of the carrier 1; due to the arrangement mode of the three first magnets 604, the detection element 8 detects more magnetic flux, and through IC control and simulation, better linearity of current and stroke is obtained, and the movement accuracy of the carrier 1 is improved. In addition, by independently powering the detection elements 8 corresponding to the bilateral first coil groups 603, the change of the angular position of the carrier 1 can also be sensed, and the angular position change signal is transmitted to the IC element through the sensing element. The IC element independently controls the current of the first coil 605 to balance the change of the angle, and then the optimal optical axis is achieved, realizing the high-precision control of Tilt.

[0040] To avoid magnetic interference, magnetic conductive sheets 9 can be provided on the side walls of the first magnet group 602 facing away from the first coil group 603 and the second magnet group 701 facing away from the second coil 703. To avoid magnetic interference between the first driving mechanism and the second driving mechanism, the first magnet group 602 and the second magnet group 701 are arranged on both sides of the carrier 1, and the magnetic pole directions are arranged vertically to reduce the magnetic interference around. In addition, the magnetic conductive sheets 9 can further block the magnetic field interference between each other; even if the magnetic conductive sheets 9 are not provided, a certain effect can still be achieved.

[0041] In this embodiment, to improve the convenience of installing the lens, a jack 10 for inserting the lens is provided on the end face in the moving direction of the carrier 1, and the inner fixing portion 301 is arranged in a ring shape to facilitate the loading of the lens. That is, the upper side wall of the jack in this embodiment is open, so as to facilitate the insertion of the lens or the device to enter from top to bottom.

[0042] Embodiment 2: A photographic device having the lens driving device described in Embodiment 1.

[0043] Embodiment 3: An electronic product having the photographic device described in Embodiment 2.

[0044] In this article, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of clearly expressing the technical solution and description, and therefore cannot be construed as a limitation of the present invention.

[0045] In this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, in addition to the listed elements, and may also include other elements not expressly listed.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lens driving device, comprising a stator assembly, a mover assembly, a first driving mechanism, and a second driving mechanism, characterized in that: The first driving mechanism and the second driving mechanism are respectively arranged on two sides of the mover assembly; The first driving mechanism comprises a first magnet group (602) arranged on the mover assembly, a first coil group (603) corresponding to the first magnet group (602), A first flexible plate (601) connected to the stator assembly; The first flexible board (601) is provided with two detection elements (8) corresponding to the two first coil groups (603) respectively, and the corresponding detection elements (8) are independently powered by the first coil groups (603); The second driving mechanism comprises a second magnet group (701) arranged on a side wall of the moving component facing away from the first magnet group (602), a second flexible plate (702) connected to the stator assembly, A second coil (703) connected to the second flexible plate (702) and connected to the second magnet group (701).

2. The lens driving device according to claim 1, characterized in that: The first magnet group (602) includes at least two first magnets (604) arranged in sequence, and the arrangement direction of the first magnets (604) is set along the moving direction of the movable component, wherein the magnetic pole of the first magnet (604) on one side facing the first coil group (603) is opposite to that of the first magnet (604) on the other side.

3. The lens driving device according to claim 1, characterized in that: The second magnet group (701) and the second coil (703) are both arranged in two groups, and the two groups of the second magnet group (701) are located on the same side of the movable component and arranged in a direction perpendicular to the moving direction of the movable component.

4. The lens driving device according to claim 1, characterized in that: The mover assembly comprises a carrier (1), two springs (2) arranged at two ends of the carrier (1) in a moving direction, the springs (2) being connected to the stator assembly, the spring (2) comprising an inner fixing portion (301) connected to an end surface of the carrier (1), an outer fixing portion (302) connected to the stator assembly, and two cantilever portions (303) connected between the inner fixing portion (301) and the outer fixing portion (302), the two cantilever portions (303) being symmetrically arranged on both sides of the inner fixing portion (301).

5. The lens driving device according to claim 4, characterized in that: The end surface of the carrier (1) in the moving direction is provided with an insertion hole (10) for inserting a lens, and the inner fixing portion (301) is arranged in a ring shape to facilitate the loading of the lens.

6. The lens driving device according to claim 5, characterized in that: The stator assembly comprises a frame (4) and a shell (5); the external fixing portion (302) is connected to the frame (4); and the shell (5) covers the frame (4).

7. A photographic device, characterized in that: A lens driving device according to any one of claims 1 to 6.

8. An electronic product, characterized in that: A photographic device according to claim 7.

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