Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame and a carrier, the base comprises a bottom plate, a conductive metal plate and a circuit board, the top surface of the bottom plate is provided with a ball groove, and a ball is arranged in the ball groove. The conductive metal plate is in a plate shape and is embedded in the bottom plate, and at least one part of the conductive metal plate is exposed in the ball groove so as to support the balls. And the circuit board is laid on the top surface of the bottom plate and is electrically connected with the conductive metal plate. The frame is located on the top face of the bottom plate and connected with the balls in a rolling mode. The carrier is installed in the frame and can move in the optical axis direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical element drive technical field, especially a lens drive mechanism. BACKGROUND

[0002] In recent years, with the development of science and technology, many electronic devices have the functions of taking pictures or recording videos. These electronic devices are increasingly popular and are developing towards the direction of convenience and thinness to provide users with more choices.

[0003] In practice, in order to adapt to various scenes for taking pictures, the lens needs to be continuously focused. In the prior art, a lens drive mechanism is generally used to drive the lens to move along the optical axis direction to adjust the focal length.

[0004] In the prior art, the lens drive mechanism includes a frame, a carrier, a top spring piece, a bottom spring piece and a base. The carrier is provided with a coil and is movably installed in the frame, and the carrier is used to install the lens. The top spring piece has elasticity and is connected with the top of the frame and the top of the carrier. The bottom spring piece also has elasticity and is connected with the bottom of the carrier and the bottom of the frame. The top spring piece and the bottom spring piece movably connect the carrier in the frame. The frame is movably installed above the base by a plurality of supporting rods and can move along the direction perpendicular to the optical axis of the lens to prevent the lens from shaking. The carrier is installed in the frame and can move along the optical axis direction of the lens to adjust the focal length of the lens.

[0005] However, many electronic devices (such as smart phones or digital cameras) have the functions of taking pictures or recording videos. These electronic devices are increasingly popular and are developing towards the direction of convenience and thinness to provide users with more choices, which also requires the lens drive mechanism to be lighter and more compact. SUMMARY

[0006] The purpose of the utility model is to provide a lens drive mechanism to solve the problems of the prior art.

[0007] To solve the above technical problems, the embodiment of the utility model provides a lens drive mechanism, which comprises:

[0008] a base, the base comprises:

[0009] a bottom plate, the top surface of the bottom plate is provided with a ball groove, and the ball groove is provided with a ball;

[0010] a conductive metal plate, the conductive metal plate is plate-shaped and is embedded in the bottom plate and at least a part of the conductive metal plate is exposed in the ball groove to support the ball; and

[0011] a circuit board, the circuit board is laid on the top surface of the bottom plate and is electrically connected with the conductive metal plate.

[0012] a frame, the frame being located on the top surface of the base plate and in rollable contact with the balls;

[0013] a carrier, the carrier being mounted in the frame and movable along the optical axis direction.

[0014] In one embodiment, the circuit board is provided with a first coil set,

[0015] a second coil set is provided on the carrier;

[0016] a plurality of magnet sets are provided on the frame, the magnet sets cooperating with the first coil set to drive the frame to move in a direction perpendicular to the optical axis, and cooperating with the second coil set to drive the carrier to move along the optical axis direction.

[0017] In one embodiment, the base is further provided with a plurality of support protrusions connected to the top surface of the base plate;

[0018] a plurality of connecting ends of the conductive metal plate extend to the top surface of the plurality of support protrusions;

[0019] The lens driving mechanism further comprises:

[0020] an upper spring sheet having elasticity and connected to the top surface of the carrier and the frame, the upper spring sheet being electrically conductive and electrically connected to the connecting ends and the second coil set;

[0021] a lower spring sheet having elasticity and connected to the bottom surface of the carrier and the frame.

[0022] In one embodiment, the top surface of the carrier is provided with a recessed mounting groove, the bottom surface of the mounting groove is provided with a recessed avoiding groove;

[0023] a chip is provided in the mounting groove, the chip being located in the mounting groove and electrically connected to the upper spring sheet, and an inductive capacitor is mounted on the chip, the inductive capacitor being located in the avoiding groove;

[0024] an inductive magnet is provided on the frame;

[0025] The inductive capacitor can induct the magnetic field of the inductive magnet to detect the position of the carrier.

[0026] In one embodiment, the magnet set comprises:

[0027] a first group of magnets, the first group of magnets being connected to one side of the frame and the width of the first group of magnets being smaller than the height;

[0028] A second group of magnets is mounted on the other side of the frame, and the width of the second group of magnets is greater than the height;

[0029] The inductive magnet is located on the top surface of the second group of magnets and is attracted to the second group of magnets.

[0030] In one embodiment, the frame is provided with a relief hole, which is aligned with the relief groove in the vertical direction;

[0031] The inductive magnet is located in the relief hole.

[0032] In one embodiment, several connection ends of the conductive metal plate are located at a side edge of the base and are electrically connected to the circuit board.

[0033] In one embodiment, the bottom plate is provided with a recess, and a sensor is arranged in the recess, and the sensor is electrically connected to the circuit board.

[0034] In one embodiment, two recesses are respectively located at different sides of the base.

[0035] In one embodiment, the bottom plate is a rectangular plate;

[0036] Four ball grooves are located at four corners of the bottom plate, and the ball is arranged in each ball groove.

[0037] The utility model discloses from base height, inductive magnet installation height, chip installation height and so on many aspects to reduce the overall height of lens drive mechanism, thereby reduce the height occupation space of lens drive mechanism, facilitate installation application. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 、 Figure 2 and Figure 3 are respectively the exploded view of the lens drive mechanism of one embodiment of the utility model.

[0039] Figure 4 and Figure 5 are respectively Figure 1 the exploded view of the base in the embodiment shown.

[0040] Figure 6 and Figure 7 are Figure 1 the assembly view of the frame, carrier, magnet group and lower spring sheet in the embodiment shown.

[0041] Figure 8 are Figure 1 the exploded view of the frame, carrier and magnet group in the embodiment shown.

[0042] Figure 9is Figure 1 An exploded view of the frame and carrier in the embodiment shown.

[0043] Figure 10 is Figure 1 A perspective view of the carrier and chip in the embodiment shown.

[0044] Figure 11 is Figure 1 A top view of the lens driving mechanism in the embodiment shown.

[0045] Figure 12 is Figure 11 A sectional view of the lens driving mechanism along line A-A in the embodiment shown.

[0046] Reference numerals: 10, lens driving mechanism; 1, base; 11, bottom plate; 12, conductive metal plate; 13, circuit board; 14, support protrusion; 15, ball; 16, rolling groove; 17, recess; 18, connecting end; 19, sensor; 2, frame; 21, first group of magnets; 22, second group of magnets; 23, driving magnet; 24, avoiding hole; 3, carrier; 31, second coil group; 32, mounting groove; 33, avoiding groove; 34, chip; 35, sensing capacitor; 4, upper spring plate; 5, lower spring plate; 6, housing; DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the claims of the present application can be realized.

[0048] Unless the context requires otherwise, throughout the specification and claims which follow, the word "comprise" and variations thereof such as "comprises" and "comprising" are to be construed in an open, inclusive sense, that is as "including, but not limited to."

[0049] The embodiments of the present application will be described in detail below with reference to the drawings, so as to make the purpose, characteristics and advantages of the present application more clear. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but only for illustrating the essential spirit of the technical scheme of the present application.

[0050] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0051] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. It should be noted that the term "comprising" as used in this specification is used in the sense of "including", and thus should be interpreted to cover also "consisting of" and "consisting essentially of".

[0052] In the following description, for the purposes of clarity, directional terms such as "front", "back", "left", "right", "upper", "lower", "over", "under", "above", "below", and the like are used with reference to the orientation of the apparatus as shown in the drawings. It is understood that these directional terms are used for convenience only and do not necessarily require a particular orientation of the apparatus.

[0053] The utility model relates to a kind of lens driving mechanism 10, the lens driving mechanism 10 includes base 1, frame 2, carrier 3, upper spring piece 4, lower spring piece 5, four ball bearings 15 and shell 6, wherein, shell 6 and base 1 buckle and form a hollow cavity, for placing frame 2, carrier 3, upper spring piece 4 and lower spring piece 5.Frame 2 movement can be anti-shake, carrier 3 is used to install lens, drive lens to move along optical axis direction to adjust focal length.Upper spring piece 4 and lower spring piece 5 are elastic respectively, for connecting carrier 3 and frame 2, to drive carrier 3 reset.

[0054] In one specific embodiment, as shown in Figures 1-5

[0055] Base 1 includes bottom plate 11, conductive metal plate 12 and circuit board 13, wherein, bottom plate 11 is rectangular plastic plate and top surface is equipped with four ball grooves 16, four ball grooves 16 are preferably arranged at the four corners of base 1. Of course, base 1 can also be set into circular plate shape, and multiple ball grooves 16 can also be arranged at the edge of base 1. Ball bearing 15 is placed in ball groove 16 to support frame 2 to move along the first direction or the second direction, and the first direction, the second direction and the optical axis direction are perpendicular to each other.

[0056] Four corners of bottom plate 11 are also equipped with four supporting protrusions 14, and the four supporting protrusions 14 are located outside the four rolling grooves respectively, which can limit the movement of frame 2.

[0057] ​The conductive metal plate 12 is also plate-shaped and is embedded in the bottom plate 11. The conductive metal plate 12 is substantially similar in shape to the bottom plate 11, and the projection of the conductive metal plate 12 substantially overlaps the projection of the bottom plate 11, that is, the conductive metal plate 12 is substantially laid flat in the bottom plate 11 after being embedded in the bottom plate 11. In addition, a portion of the conductive metal plate 12 is exposed in the ball groove 16 to support the ball 15 and prevent the ball 15 from wearing the bottom plate 11.

[0058] The circuit board 13 is laid flat on the top surface of the bottom plate 11 and is electrically connected to the conductive metal plate 12. The circuit board 13 is internally provided with a first coil group.

[0059] The frame 2 is rectangular frame-shaped and is mounted on the top surface of the bottom plate 11 and is rollably connected to the bottom plate 11 by four balls 15. The frame 2 is located in the four support protrusions 14 and can move in the support protrusions 14.

[0060] The frame 2 is provided with a magnet group that can cooperate with the first coil group to drive the frame 2 to move in a first direction or a second direction.

[0061] The carrier 3 is mounted in the ring of the frame 2 and can move in the optical axis direction, that is, the vertical direction as shown. Figure 1

[0062] The carrier 3 is provided with a second coil group 31 that cooperates with the magnet group to drive the carrier 3 to move in the optical axis direction.

[0063] The upper spring 4 is located on the top surface of the frame 2 and the carrier 3 and is elastically connected to the frame 2 and the carrier 3, respectively. The lower spring 5 is located on the bottom surface of the frame 2 and the carrier 3 and is also elastically connected to the frame 2 and the carrier 3. The upper spring 4 and the lower spring 5 cooperate to drive the carrier 3 to reset after the carrier 3 moves.

[0064] The conductive metal plate 12 is also provided with a plurality of connection terminals 18, some of which are located on one side of the bottom plate 11 and are used to be electrically connected to the circuit board 13. The other part of the connection terminals 18 extends to the top surface of the four support protrusions 14 and is electrically connected to the upper spring 4.

[0065] The conductive metal plate 12 not only supports the bottom plate 11 and the plurality of balls 15, but also is electrically connected to the upper spring 4 and the circuit board 13 to provide a circuit function.

[0066] The top surface of the bottom plate 11 is also provided with two grooves 17, and the two grooves 17 are respectively close to the two adjacent sides of the bottom plate 11 and are respectively internally provided with a sensor 19. The sensor 19 is electrically connected to the circuit board 13 and is used to sense the position of the frame 2.

[0067] ​In addition, several connecting terminals 18 electrically connected with the circuit board 13 are arranged at different sides of the bottom plate 11 from the two grooves 17, so that the space of the bottom plate 11 can be fully utilized.

[0068] Since the conductive metal plate 12 is relatively thin, the thickness of the base 1 can be reduced, and the structural strength of the base 1 can be enhanced. In the prior art, several connecting terminals 18 connected with the circuit board 13 are arranged in the avoiding hole 24 close to the bottom plate 11, in the present application, since the entire conductive metal plate 12 is relatively large, the positions of the connecting terminals 18 connected with the circuit board 13 are occupied, so that the several connecting terminals 18 connected with the circuit board 13 are arranged on the same side of the bottom plate 11 to avoid the sensor 19.

[0069] In addition, arranging the several connecting terminals 18 on the side of the bottom plate 11 is also convenient for welding with the circuit board 13.

[0070] The top surface of the carrier 3 is provided with a recessed mounting groove 32, and the bottom surface of the mounting groove 32 is provided with a recessed avoiding groove 33.

[0071] The chip 34 is arranged in the mounting groove 32, the chip 34 is electrically connected with the upper spring piece 4, and the inductive capacitor 35 is arranged on the chip 34 and located in the avoiding groove 33.

[0072] The frame 2 is provided with an avoiding hole 24, the avoiding hole 24 is a through hole penetrating through the frame 2 and is aligned with the mounting groove 32 and the avoiding groove 33 in the vertical direction, and the inductive magnet is arranged in the avoiding hole 24.

[0073] The inductive capacitor 35 on the chip 34 can sense the magnetic field change of the inductive magnet, and then determine the position of the carrier 3.

[0074] In the prior art, the chip 34 needs to be arranged outside the lens driving mechanism 10, that is, in the electronic device. The chip 34 is arranged in the mounting groove 32 of the carrier 3 in the present application, so that the internal space of the lens driving mechanism 10 is not increased, and the space occupied by the electronic device can be reduced.

[0075] The magnet group includes a first group of magnets 21 and a second group of magnets 22, the first group of magnets 21 extends along the first direction and is connected to one side of the frame 2 along the second direction, and the width of the first group of magnets 21 is smaller than the height, that is, the size of the first group of magnets 21 along the second direction is smaller than the height.

[0076] The second group of magnets 22 extends along the second direction and is arranged on one side of the frame 2 along the first direction, and the width of the second group of magnets 22 along the first direction is greater than the height, that is, the second group of magnets 22 is arranged horizontally.

[0077] The second group of magnets 22 is located on the bottom surface of the inductive magnet, and the second group of magnets 22 can reduce the size in the height direction to avoid the inductive magnet.

[0078] The second group of magnets 22 is also attracted to the inductive magnet, which can improve the stability of the inductive magnet,

[0079] The utility model discloses from base 1 height, inductive magnet installation height, chip 34 installation height etc. many aspects to reduce the overall height of lens drive mechanism 10, thereby reduce the height occupation space of lens drive mechanism 10, facilitate installation application.

[0080] The preferred embodiments of the utility model have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to employ aspects, features and concepts of various patents, applications and publications to provide additional embodiments.

[0081] In view of the above detailed description, these and other changes can be made to the embodiments. Generally, the terms used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0082] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the utility model, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the utility model.

Claims

1. A lens driving mechanism characterized by comprising: The application relates to a lens driving mechanism. The base comprises: a bottom plate, the top surface of which is provided with ball grooves, and balls are arranged in the ball grooves; a conductive metal plate, which is plate-shaped and embedded in the bottom plate and at least partially exposed in the ball grooves to support the balls; and a circuit board, which is laid on the top surface of the bottom plate and electrically connected with the conductive metal plate; a frame, which is arranged on the top surface of the bottom plate and rollably contacted with the balls; a carrier, which is mounted in the frame and movable along the optical axis.

2. The lens driving mechanism according to claim 1, wherein The circuit board is provided with a first coil group, a second coil group is arranged on the carrier; a plurality of magnet groups are arranged on the frame, and the magnet groups are matched with the first coil group to drive the frame to move in a direction perpendicular to the optical axis, and matched with the second coil group to drive the carrier to move along the optical axis.

3. The lens driving mechanism according to claim 2, wherein The base is further provided with a plurality of supporting protrusions connected to the top surface of the bottom plate; a plurality of connecting ends of the conductive metal plate extend to the top surface of the supporting protrusions; The lens driving mechanism further comprises: an upper spring sheet, which is elastic and connected to the top surface of the carrier and the frame, and electrically conductive and electrically connected with the connecting ends and the second coil group; a lower spring sheet, which is elastic and connected to the bottom surface of the carrier and the frame.

4. The lens driving mechanism according to claim 3, wherein The top surface of the carrier is provided with a recessed mounting groove, and the bottom surface of the mounting groove is provided with a recessed avoiding groove; a chip is arranged in the mounting groove, the chip is arranged in the mounting groove and electrically connected with the upper spring sheet, and an inductive capacitor is mounted on the chip and arranged in the avoiding groove; an inductive magnet is arranged on the frame; The inductive capacitor can induct the magnetic field of the inductive magnet to detect the position of the carrier.

5. The lens driving mechanism according to claim 4, wherein The magnet group comprises: a first group of magnets, which is connected to one side of the frame and has a width smaller than a height; a second group of magnets, which is mounted on the other side of the frame and has a width greater than a height; The inductive magnet is arranged on the top surface of the second group of magnets and attracted to the second group of magnets.

6. The lens driving mechanism according to claim 5, wherein The frame is provided with an avoiding hole, which is vertically aligned with the avoiding groove; The inductive magnet is arranged in the avoiding hole.

7. The lens driving mechanism according to claim 1, wherein A plurality of connecting ends of the conductive metal plate are arranged at one side edge of the base and electrically connected with the circuit board.

8. The lens driving mechanism according to claim 7, wherein The bottom plate is provided with grooves, and sensors are arranged in the grooves and electrically connected with the circuit board.

9. The lens driving mechanism according to claim 8, wherein Two grooves are respectively arranged at different sides of the base.

10. The lens driving mechanism according to claim 1, wherein The bottom plate is rectangular and plate-shaped; Four ball grooves are arranged at four corners of the bottom plate, and balls are respectively arranged in the ball grooves.

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