Lens driving device

Abstract

The utility model belongs to the technical field of optical imaging equipment, and particularly relates to a lens driving device which comprises a base, a carrier, a frame and a driving assembly, and the driving assembly comprises an AF coil, a magnet group and an OIS coil group. The frame is arranged at the upper end of the base, an upper reed is connected between the top end of the frame and the top end of the carrier, supporting columns are arranged at four end corners of the base, the top ends of the supporting columns are connected with the upper reed, and the frame and the carrier are suspended on the base. According to the utility model, the frame and the carrier are supported through the upper reed, so that the frame and the carrier are in a suspended state, thereby reducing the friction force during OIS driving, and enabling the frame and the carrier to move in the second direction and the third direction to realize the anti-shake function more smoothly and stably.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical imaging equipment, and in particular relates to a lens driving device. Background Art

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the function of taking photos or recording videos. These electronic devices are becoming more and more popular and are developing in the direction of convenient and lightweight designs to provide users with more choices.

[0003] Some electronic devices with camera or video recording functions are equipped with a lens driving device to drive the movement of optical components such as lenses, thereby achieving the functions of autofocus and optical image stabilization (OIS). Light can pass through the optical components to form an image on the photosensitive component.

[0004] The existing lens driving device usually includes an OIS coil group, a magnet group, an AF coil and a carrier for mounting the lens. However, the carrier is easily affected by friction during movement, which in turn causes unsmooth movement and affects the anti-shake function. Utility Model Content

[0005] The utility model aims to provide a lens driving device in view of the above technical problems.

[0006] A lens driving device comprises a base, a carrier, a frame and a driving assembly;

[0007] The frame is arranged at the upper end of the base, an upper spring sheet is connected between the top of the frame and the top of the carrier, support columns are arranged at the four end corners of the base, the top of the support column is connected to the upper spring sheet, and the frame and the carrier are suspended on the base.

[0008] Optionally, the lens driving device further comprises a shell, wherein the shell and the base form a hollow cavity, and the carrier, the frame and the driving assembly are located in the hollow cavity.

[0009] Optionally, the driving assembly includes an AF coil, a magnet group and an OIS coil group, the magnets of the magnet group are installed on the inner sides of the frame, the carrier is located on the inner side of the frame, the AF coil is arranged on the outer side of the carrier, the AF coil and the magnets of the magnet group are arranged opposite to each other inside and outside, and the AF coil cooperates with the magnets of the magnet group to drive the carrier to move in a first direction relative to the frame;

[0010] The OIS coils of the OIS coil group are arranged around the upper end of the base. The OIS coils of the OIS coil group cooperate with the magnets of the magnet group to drive the frame and the carrier to move in the second direction and the third direction relative to the base. The second direction and the third direction are respectively perpendicular to the first direction.

[0011] Optionally, a lower spring sheet is connected between the bottom end of the frame and the bottom end of the carrier.

[0012] Optionally, a base built-in circuit is provided in the base, the base built-in circuit is connected to each OIS coil of the OIS coil group, and the base built-in circuit is connected to the AF coil via the upper spring sheet.

[0013] Optionally, ball grooves are provided at four end corners at the bottom end of the frame and four end corners at the top end of the base, and balls are clamped in the upper and lower ball grooves.

[0014] Optionally, a metal sheet is provided in the ball groove, and the upper and lower ends of the ball are in contact with the upper and lower metal sheets respectively.

[0015] Optionally, the metal sheet is embedded in the ball groove.

[0016] Optionally, the metal sheet is injection molded on the surface of the ball groove.

[0017] Optionally, the four ball grooves on the base are respectively located below the sides of the four support columns.

[0018] Beneficial effects: The utility model has at least one or more of the following advantages:

[0019] 1. The utility model supports the frame and the carrier through the upper spring sheet, so that the frame and the carrier are in a suspended state, so as to reduce the friction during OIS driving, so that the frame and the carrier can realize the anti-shake function more smoothly and stably when moving in the second direction and the third direction.

[0020] 2. The elastic effect of the upper spring of the utility model can achieve a certain reset effect after the anti-shake function is realized. The joint effect of the upper spring and the lower spring can achieve a certain reset effect after the carrier moves in the first direction to achieve focus.

[0021] 3. The ball bearing design of the utility model can provide auxiliary support for the frame and reduce the friction of the frame moving in the second and third directions.

[0022] 4. A metal sheet is arranged in the ball groove, which can improve the supporting force of the metal sheet on the ball and reduce the wear of the ball groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural schematic diagram of the utility model;

[0024] Figure 2 for Figure 1 AA section view;

[0025] Figure 3 for Figure 1 Exploded diagram of

[0026] Figure 4 for Figure 3 Further exploded diagram of;

[0027] Figure 5 for Figure 4 Schematic diagram from another angle;

[0028] Figure 6 for Figure 4 Further exploded diagram of;

[0029] Figure 7 for Figure 6 Further exploded diagram of . DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to describe the preferred embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0031] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0032] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0033] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0034] In the following description, the first direction is defined as the Z-axis direction, that is, the optical axis direction, the second direction is defined as the X-axis direction, and the third direction is defined as the Y-axis direction. The optical axis direction represents the propagation direction of light in the optical element, which is an abstract concept and does not refer to the existence of an axis in a physical sense.

[0035] Reference Figures 1 to 7 The present embodiment provides a lens driving device, which includes a housing 1, a base 2, a carrier 3, a frame 4 and a driving assembly. The driving assembly includes an AF coil 51 disposed on the carrier 3, a magnet group disposed on the frame 4, and an OIS coil group disposed on the base 2. The magnet group has a plurality of magnets 52, and the OIS coil group has a plurality of OIS coils 53. The number of magnets 52 and the number of OIS coils 53 are preferably the same, and the two are disposed oppositely.

[0036] The AF coil 51 is arranged opposite to the magnet 52 in the magnet group, and the two cooperate to drive the carrier 3 to move in the Z-axis direction relative to the frame 4. A lens is installed on the carrier 3 to achieve a zoom operation of the lens.

[0037] Each OIS coil 53 in the OIS coil group cooperates with the corresponding magnet 52 in the magnet group to drive the frame 4 and the carrier 3 inside it to move in the X-axis direction and the Y-axis direction relative to the base 1 to achieve the OIS anti-shake operation of the lens.

[0038] The frame 4 is arranged at the upper end of the base 2, and an upper spring piece 6 is connected between the top of the frame 4 and the top of the carrier 3. Support columns 21 are arranged at the four end corners of the base 2, and the top of the support column 21 is connected to the upper spring piece 6, so that the frame 4 and the carrier 3 are suspended on the base 2. The frame 4 and the carrier 3 are supported by the upper spring piece 6, so that the frame 4 and the carrier 3 are in a suspended state, so as to reduce the friction force when the OIS is driven, so that the frame 4 and the carrier 3 can realize the anti-shake function more smoothly and stably when moving in the X-axis direction and the Y-axis direction. In addition, the elastic effect of the upper spring piece 6 can play a certain reset effect after realizing the anti-shake function.

[0039] The housing 1 is an optional structure, and a hollow cavity is formed between the housing 1 and the base 2. The housing 1 and the base 2 are preferably connected by snapping to form the hollow cavity. The carrier 3, the frame 4, the drive assembly and the upper spring 6 are located in the hollow cavity.

[0040] In one embodiment, magnets 52 of a magnet group are installed on the inner side of the frame 4, the carrier 3 is located on the inner side of the frame 4, and each magnet 52 corresponds to the AF coil 51 wound on the outer side of the carrier 3. The AF coil 51 cooperates with each magnet 52 to drive the carrier 3 to move in the Z-axis direction relative to the frame 4.

[0041] OIS coils 53 of the OIS coil group are arranged around the upper end of the base 2. The OIS coils 53 of the OIS coil group cooperate with the magnets 52 of the magnet group to drive the frame 4 and the carrier 3 to move relative to the base 2 in the X-axis direction and the Y-axis direction.

[0042] In one embodiment, magnet installation grooves are provided on the inner sides of the frame 4 , and each magnet 52 of the magnet group is installed in the magnet installation grooves.

[0043] In one embodiment, a lower spring sheet 7 is connected between the bottom end of the frame 4 and the bottom end of the carrier 3 .

[0044] The upper spring piece 6 and the lower spring piece 7 work together to achieve a certain resetting effect after the carrier 3 moves in the first direction to achieve focusing.

[0045] In one embodiment, the upper spring piece 6 can adopt a split structure, which has two independent upper spring support pieces, the two upper spring support pieces are centrally symmetrically arranged, there is a certain distance between the two upper spring support pieces, and each upper spring support piece is respectively connected to the carrier 3, the frame 4 and the support column 21. The upper spring support piece has a frame upper connection part connected to the frame 4, a carrier upper connection part connected to the carrier 3, a base connection part connected to the support column 21, and a plurality of upper elastic connection pieces, and the upper elastic connection pieces realize elastic connection between the frame upper connection part, the carrier upper connection part and the base connection part.

[0046] The lower spring leaf 7 adopts an integrated structure, and has a plurality of frame lower connecting parts connected to the frame 4, a plurality of carrier lower connecting parts connected to the carrier 3, and a plurality of lower elastic connecting pieces, and the lower elastic connecting pieces elastically connect the frame lower connecting parts and the carrier lower connecting parts.

[0047] In one embodiment, a base built-in circuit is disposed in the base 2 , and the base built-in circuit is connected to each OIS coil 53 of the OIS coil group, and the base built-in circuit is connected to the AF coil 51 via the upper spring piece 6 .

[0048] During the driving operation, the current of the built-in circuit of the base is transmitted to the OIS coil 53 and the upper spring piece 6, and then transmitted to the AF coil 51 on the periphery of the carrier 3 through the upper spring piece 6 to supply power, thereby realizing the power supply operation of the OIS coil 53 and the AF coil 51.

[0049] Specifically, a contact point may be provided on the support column 21 , a circuit built into the base is connected to the contact point, and the contact point is connected to the upper spring sheet 6 .

[0050] In one embodiment, ball grooves 81 are provided at the four corner positions at the bottom end of the frame 4 and the four corner positions at the top end of the base 2 , and the balls 8 are clamped in the upper and lower ball grooves 81 .

[0051] The design of the ball bearing 8 of the utility model can play an auxiliary supporting effect on the frame 4 and reduce the friction force of the frame 4 moving in the X-axis direction and the Y-axis direction.

[0052] In one embodiment, a metal sheet 82 is disposed in the ball groove 81 , and the upper and lower ends of the ball 8 are in contact with the upper and lower metal sheets 82 respectively.

[0053] A metal sheet 82 is provided in the ball groove 81 , which can improve the supporting force of the metal sheet 82 on the ball 8 and reduce the wear of the ball groove 81 .

[0054] In one embodiment, the metal sheet 82 is embedded in the ball groove 81 .

[0055] In one embodiment, the metal sheet 82 is injection molded on the surface of the ball groove 81 .

[0056] In one embodiment, the four ball grooves 81 on the base 2 are respectively located below the sides of the four support pillars 21 .

[0057] In one embodiment, a position sensor 9 is disposed at the bottom of the base 2 , and the movement positions of the frame 4 and the carrier 3 are monitored by the cooperation between the position sensor 9 and the magnet 62 of the magnet group.

[0058] The position sensor 9 may be powered by a base built-in circuit disposed in the base 2 .

[0059] Two position sensors 9 may be provided, which are respectively located at the bottom ends of two adjacent sides of the base 2 .

[0060] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A lens driving device, comprising a base, a carrier, a frame and a driving assembly; It is characterized in that The frame is arranged at the upper end of the base, an upper spring sheet is connected between the top of the frame and the top of the carrier, support columns are arranged at the four end corners of the base, the top of the support column is connected to the upper spring sheet, and the frame and the carrier are suspended on the base.

2. The lens driving device according to claim 1, wherein: The lens driving device further comprises a shell, wherein the shell and the base form a hollow cavity, and the carrier, the frame and the driving assembly are located in the hollow cavity.

3. The lens driving device according to claim 1, wherein: A lower spring sheet is connected between the bottom end of the frame and the bottom end of the carrier.

4. The lens driving device according to claim 1, wherein: Ball grooves are arranged at the four end corners at the bottom of the frame and the four end corners at the top of the base, and balls are clamped in the upper and lower ball grooves.

5. The lens driving device according to claim 4, characterized in that: A metal sheet is arranged in the ball groove, and the upper and lower ends of the ball are in contact with the upper and lower metal sheets respectively.

6. The lens driving device according to claim 5, characterized in that: The metal sheet is embedded in the ball groove.

7. The lens driving device according to claim 5, characterized in that: The metal sheet is injection molded on the surface of the ball groove.

8. The lens driving device according to claim 4, characterized in that: The four ball grooves on the base are respectively located below the sides of the four support columns.

9. The lens driving device according to any one of claims 1 to 8, characterized in that: The driving assembly includes an AF coil, a magnet group and an OIS coil group. The magnets of the magnet group are installed on the inner sides of the frame. The carrier is located on the inner side of the frame. The AF coil is arranged on the outer side of the carrier. The AF coil and the magnets of the magnet group are arranged opposite to each other inside and outside. The AF coil cooperates with the magnets of the magnet group to drive the carrier to move in a first direction relative to the frame. The OIS coils of the OIS coil group are arranged around the upper end of the base. The OIS coils of the OIS coil group cooperate with the magnets of the magnet group to drive the frame and the carrier to move in the second direction and the third direction relative to the base. The second direction and the third direction are respectively perpendicular to the first direction.

10. The lens driving device according to claim 9, wherein: A base built-in circuit is disposed in the base, the base built-in circuit is connected to each OIS coil of the OIS coil group, and the base built-in circuit is connected to the AF coil via the upper spring sheet.

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