CN220509195U

CN220509195U - Lens driving mechanism

Info

Publication number: CN220509195U
Application number: CN202321340216.3U
Authority: CN
Inventors: 请求不公布姓名; 杨洋; 陈曦; 彭坤; 林聪�; 刘富泉; 吕新科
Original assignee: Henan Hozel Electronics Co Ltd
Current assignee: Henan Hozel Electronics Co Ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2024-02-20
Anticipated expiration: 2033-05-26

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier, a reset piece and a supporting frame, wherein the base is provided with a first coil group, a first pole piece group and a first chip group; the frame and the base are arranged at intervals and are provided with a first magnet group, a second magnet group and a first metal sheet group, the first magnet group comprises a plurality of first axial magnetic strips and first radial magnetic strips, the plurality of first axial magnetic strips are arranged at intervals along a first direction, the polarities of the first axial magnetic strips are distributed along the direction of an optical axis, and the polarities of two adjacent first axial magnetic strips are reversely arranged; the first radial magnetic strips are positioned between two adjacent first axial magnetic strips; the first metal sheet group and the first pole piece group form a first capacitor group, and the first capacitor group is electrically connected with the first chip group; the carrier is connected with the frame and is provided with a second coil group, and the second coil group and the second magnet group are matched to drive the carrier to move along the optical axis direction; the reset piece is connected with the frame and the carrier and drives the carrier to reset, and the support piece is connected with the reset piece and the base.

Description

Lens driving mechanism

Technical Field

The present utility model relates to the field of optical driving, and in particular, to a lens driving mechanism.

Background

With the development of technology, many electronic devices have a camera or video function. The use of these electronic devices is becoming more and more popular and is evolving towards a convenient and light-weight design that provides more options for the user.

In practice, in order to accommodate photographing of various scenes, the lens needs to be continuously focused, and in the prior art, a lens driving mechanism is generally used to drive the lens to move along the optical axis direction so as to adjust the focal length.

The lens driving mechanism comprises a frame, a carrier, an upper reed, a lower reed and a base, wherein the carrier is provided with a coil and can be movably arranged in the frame, and the carrier is used for installing a lens. The upper reed is elastic and connected to the top of the frame and the top of the carrier, the lower reed is also elastic and connected to the bottom of the carrier and the bottom of the frame, and the upper reed and the lower reed movably connect the carrier in the frame. The frame is movably arranged above the base and can move along the direction perpendicular to the optical axis of the lens so as to prevent the lens from shaking. The carrier is arranged in the frame and can move along the optical axis direction of the lens so as to adjust the focal length of the lens.

However, as electronic devices become more sophisticated, so too is the market demand for lens drive mechanisms, for example, the market not only requires lens drive mechanisms to drive lens movements quickly, but also must be light enough to accommodate more sophisticated electronic devices. Therefore, there is a need to develop various sophisticated lens driving mechanisms to meet the market demand.

Disclosure of Invention

The present utility model is directed to a lens driving mechanism to solve the above-mentioned problems.

In order to solve the above technical problems, an embodiment of the present utility model provides a lens driving mechanism, including:

the base is provided with a first coil group, a first pole piece group and a first chip group;

the frame, the frame along the optical axis direction of camera lens with the base interval sets up and is equipped with:

the first magnetite group, first magnetite group with first coil group cooperation can drive the frame motion just includes:

the first axial magnetic strips are arranged at intervals along a first direction, the polarities of the first axial magnetic strips are distributed along the direction of the optical axis, and the polarities of two adjacent first axial magnetic strips are reversely arranged;

the first radial magnetic strips are positioned between two adjacent first axial magnetic strips, the polarities of the first radial magnetic strips are distributed along a first direction, and the first direction is perpendicular to the optical axis direction;

a second magnet group;

the first metal sheet group is aligned with the first pole piece group along the optical axis direction and forms a first capacitor group, and the first capacitor group is electrically connected with the first chip group;

the carrier is movably connected with the frame and is provided with a second coil group, and the second coil group and the second magnet group are matched to drive the carrier to move along the optical axis direction;

a reset member coupled to the frame and the carrier and operable to drive the carrier to reset; and

the support piece is connected with the reset piece and the base.

In one embodiment, the polarities of the second magnets are distributed along the optical axis direction.

In one embodiment, the first magnet group is aligned with the first coil group along the optical axis direction, and the first metal sheet group is located on a side of the first magnet group facing the first coil group; the first pole piece group is positioned on the side surface of the first coil group facing the first magnet group.

In one embodiment, the first pole piece group comprises a plurality of first pole pieces; the first metal sheet group comprises a plurality of first metal sheets, a plurality of first electrode sheets and a plurality of first metal sheets form a plurality of first capacitors, and a plurality of first capacitors form the first capacitor group.

In one embodiment, the plurality of first chip sets includes a plurality of first chips, and the plurality of first chips are electrically connected to the first chips, respectively.

In one embodiment, the base includes:

the bottom plate is internally provided with a built-in circuit, and the side surface of the bottom plate facing the frame is provided with a mounting groove; and

the circuit board is stacked on the side surface of the bottom plate facing the frame and is electrically connected with the built-in circuit, the first coil group and the first pole piece group are located in the circuit board, and the first chip group is connected to the side surface of the circuit board facing the bottom plate and is located in the mounting groove.

In one embodiment, the second magnet group includes a plurality of second magnets stacked in the optical axis direction and the polarities of the second magnets are distributed in the optical axis direction.

In one embodiment, the second magnet group is aligned with the second coil group along a second direction, the second direction being perpendicular to the optical axis direction;

the frame is also provided with a second metal sheet group which is arranged on the radial inner side of the frame;

the carrier is also provided with a second pole piece group which is arranged on the radial outer side of the carrier and aligned with the second metal piece group along the second direction, and the second pole piece group and the second metal piece group form a second capacitor group;

the base is also provided with a second chip set electrically connected with the second capacitor set.

In one embodiment, a first metal frame electrically connected with the built-in circuit is further arranged in the frame, and the first metal sheet group and the second metal sheet group are electrically connected with the first metal frame; and a second metal frame electrically connected with the built-in circuit is further arranged in the carrier, and the second pole piece group is electrically connected with the second metal frame.

In one embodiment, the second pole piece group comprises at least one second pole piece; the second metal sheet group comprises at least one second metal sheet, and the second electrode sheet and the second metal sheet form a second capacitor; the second capacitor group includes at least one of the second capacitors.

The utility model can replace the sensor in the prior art by utilizing a plurality of capacitors, thereby greatly reducing the weight and the volume of the lens driving mechanism and facilitating the lighter weight of the lens driving mechanism. In addition, by changing the distribution of the first magnet group and the second magnet group, the driving force of the movement of the driving frame and the carrier can be improved.

Drawings

Fig. 1, 2 and 3 are exploded views of a lens driving mechanism according to an embodiment of the present utility model.

Fig. 4 is an exploded view of the base of the embodiment shown in fig. 1.

Fig. 5 is a perspective view of a first metal frame, a first pole piece set, and a first metal sheet of one embodiment of the present utility model.

Fig. 6 is a perspective view of a first sheet metal set and a first chip set according to an embodiment of the present utility model. Fig. 7 is a perspective view of the first pole piece set and first chip set of the embodiment of fig. 6.

Fig. 8 is a schematic view of a first magnet group and a first coil group according to an embodiment of the present utility model.

Reference numerals: 100. a lens driving mechanism; 1. a base; 11. a bottom plate; 12. a circuit board; 13. a first pole piece group; 14. a mounting groove; 15. a first chipset; 16. a first coil group; 2. a frame; 211. a first magnet group; 212. a second magnet group; 213. a first axial magnetic stripe; 214. a first radial magnetic stripe; 22. a first metal frame; 23. a first metal sheet group; 24. a second metal sheet group; 3. a carrier; 31. a second coil group; 32. a second electrode sheet group; 33. a second metal frame; 4. an upper reed; 5. a lower reed; 7. a suspension wire; 8. a housing; x, a first direction; y, second direction; z, optical axis direction;

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising" will be understood to be open-ended, meaning of inclusion, i.e. to be interpreted to mean "including, but not limited to.

The following detailed description of various embodiments of the present utility model will be provided in connection with the accompanying drawings to provide a clearer understanding of the objects, features and advantages of the present utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the utility model, but rather are merely illustrative of the true spirit of the utility model.

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, appearances of the phrases "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 may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present utility model, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.

The utility model relates to a lens driving mechanism 100, which is convenient to process, small in structure and quite stable in operation. The lens driving mechanism 100 according to an embodiment of the present utility model is described in radial detail below with reference to the accompanying drawings.

As shown in fig. 1 to 3, the lens driving mechanism 100 of this embodiment specifically includes a base 1, a frame 2, a carrier 3, a restoring member, a supporting frame, and a housing 8, wherein the base 1 is used to support the frame 2 and the carrier 3. The frame 2 can prevent lens shake. The carrier 3 is mounted in the frame 2 for focusing. The reset element is used for driving the carrier 3 to reset. The support frame is used for supporting the frame 2 to hang above the base 1. It should be understood that in the embodiment shown in fig. 1-3, the optical axis direction Z is vertical, the radial direction is horizontal, and the radial direction is perpendicular to the optical axis direction Z.

The base 1 includes a base plate 11 and a circuit board 12, and in the embodiment of fig. 1 and 4, the base plate 11 is injection molded to form a flat plate shape, and the plane of the base plate 11 is parallel to the radial direction, i.e. perpendicular to the optical axis of the lens. The base 1 generally needs to be fixedly connected to the interior of the electronic device. It should be understood that in other embodiments, the base plate 11 may have other shapes, for example, a circular plate shape or an irregular shape, and the shape of the base plate 11 may be set as required.

The base plate 11 is also embedded with built-in wiring which can be electrically connected to an external power supply. The top surface of the base plate 11 is also provided with a mounting groove 14, as shown in fig. 4, which mounting groove 14 is formed by recessing the top surface of the base plate 11.

The circuit board 12 covers the top surface of the base plate 11 and is electrically connected to the built-in wiring of the base plate 11. The circuit board 12 is provided with a first coil group 16, a first pole piece group 13 and a first chip group 15, wherein the first coil group 16 and the first pole piece group 13 are positioned in the first circuit board 12, and the first chip group 15 is connected to the bottom surface of the circuit board 12 and positioned in the mounting groove 14.

The frame 2 is ring-shaped extending around the optical axis direction Z and is located above the base 1 and spaced apart from the base 1, i.e. the frame 2 is located on the side of the bottom plate 11 facing the circuit board 12 and spaced apart from the circuit board 12.

The frame 2 is provided with a first magnet group 211, a second magnet group 212 and a first metal sheet group 23, wherein the first magnet group 211 is matched with the first coil group 16 to drive the frame 2 to move along the radial direction, the second magnet group 212 is matched with the second coil group 31 of the carrier 3 to drive the carrier 3 to move along the optical axis direction Z, and specifically, the first metal sheet group 23 is matched with the first electrode sheet group 13 to form a first capacitor group.

Specifically, the first magnet group 211 is connected to a side portion along the first direction X and is located above the first coil group 16, and the first magnet group 211 is aligned with the first coil group 16 along the optical axis direction Z and includes a plurality of first axial magnetic strips 213 and at least one first radial magnetic strip 214, as shown in fig. 1 and 8, two first axial magnetic strips 213 are arranged at intervals along the first direction X, and the first radial magnetic strip 214 is located in the middle of the two first axial magnetic strips 213. It should be understood that a plurality of first axial magnetic strips 213 and a plurality of first radial magnetic strips 214 may be provided, and the plurality of first axial magnetic strips 213 are alternately arranged along the first direction X, the polarities of the first axial magnetic strips 213 are distributed along the optical axis direction Z, and the polarities of two adjacent first axial magnetic strips 213 are reversely distributed. It should be understood that the first direction X may also be arranged in any other radial direction, which is parallel to the plane of the base plate, i.e. perpendicular to the direction of the optical axis.

In the embodiment shown in fig. 8, the N-pole and S-pole of one of the two first axial magnetic strips 213 are distributed in the vertical direction, and the N-pole and S-pole of the other first axial magnetic strip are also distributed in the vertical direction but in the opposite polarity direction. The polarity of the first radial magnetic stripe 214 is distributed along the first direction X, i.e. the N-and S-poles of the first radial magnet are arranged radially.

In the conventional design, the polarities of the first magnet group 211 are distributed along the radial direction, and the magnetic field lines of the first magnet group 211 extend from two sides of the first magnet group 211 along the radial direction towards the bottom and pass through the first coil group 16, so that in order to increase the magnetic field lines of the first magnet group 211 passing through the first coil group 16, the size of the first coil group 16 along the first direction X needs to be increased, so that two sides of the first coil group 16 along the first direction X exceed two sides of the first magnet group 211 along the first direction X, and in this case, the size and the weight of the first coil group 16 need to be increased, which is unfavorable for the light design.

In the present utility model, only the first coil group 16 needs to be disposed at the bottoms of two adjacent first axial magnets 213 along two sides of the first direction X, the magnetic field lines formed by the N-poles and the S-poles at the bottoms of two adjacent first axial magnetic strips 213 may pass through the first coil group 16, and the N-poles and the S-poles of two first axial magnetic strips 213 may also form magnetic field lines with the S-poles and the N-poles of the first radial magnetic strips 214, and the magnetic field lines may also pass through the first coil group 16, so as to further improve the magnetic field lines and lorentz forces of the first magnet group 211 passing through the first coil group 16, and improve the driving force of the frame 2 in radial movement. In addition, since the polarities of the adjacent two first axial magnetic strips 213 are distributed along the optical axis direction Z, the N pole of one first axial magnetic strip 213 and the S pole of the other first axial magnetic strip 213 are both located at the bottom, the width of the first coil group 16 along the first direction X can be properly reduced, so that the size and weight of the first coil group 16 can be reduced, which is also beneficial to improving the weight of the lens driving mechanism 100.

The second magnet group 212 is connected to a side portion of the frame 2 along the second direction Y and includes at least one second magnet whose polarity is distributed along the optical axis direction Z. In the embodiment shown in fig. 1, two second magnets are stacked in the optical axis direction Z, and polarities of the second magnets are all distributed in the optical axis direction Z. It should be understood that a plurality of second magnets may be provided, and the plurality of second magnets may be stacked in the optical axis direction Z. It will be appreciated that the second direction Y may also be arranged in any direction in the radial direction, e.g. parallel or crosswise to the first direction X, etc.

The first sheet metal set 23 includes a plurality of first sheet metal, as shown in fig. 5 and 6, the first sheet metal set 13 includes a plurality of first sheet metal, the number of the first sheet metal and the number of the first sheet metal may be in one-to-one correspondence, the plurality of first sheet metal are aligned with the plurality of first sheet metal along a vertical direction and form a plurality of first capacitors, and the plurality of first capacitors form a first capacitor set. The first metal sheet group 23 is located on the bottom surface of the first magnet group 211 facing the first coil group 16; and the first pole piece group 13 is located on the top surface of the first coil group 16 facing the first magnet group 211, which increases the distance between the first metal piece group 23 and the first pole piece group 13, so as to improve the test sensitivity of the first capacitor group.

The first chipset 15 includes a plurality of first chips, as shown in fig. 7, and a plurality of first capacitors are electrically connected to a portion of the first chips of the plurality of first chips, respectively, and the first chips also sense the capacitance of the first capacitors. When the frame 2 moves in the radial direction, the relative area of the first pole piece and the first metal piece changes, thereby causing the capacitance of the first capacitor to change. The first capacitor may be used instead of the existing hall sensor, and the first and second metal sheets are small and lightweight, and the weight and volume of the lens driving mechanism 100 may be reduced.

The carrier 3 is mounted in the ring of the frame 2 and can move along the optical axis direction Z, the carrier 3 is provided with a second coil group 31, the second coil group 31 and the second magnet group 212 are oppositely arranged along the first direction X, and the second coil group 31 and the second magnet group 212 are matched to drive the carrier 3 to move along the optical axis direction Z.

The carrier 3 is also provided with a second pole piece set, which is preferably arranged radially outside the carrier 3. The frame 2 is further provided with a second set of metal sheets 24, the second set of metal sheets 24 preferably being arranged radially outside the frame 2 and being aligned radially with the second set of pole sheets, the second set of metal sheets 24 and the second set of pole sheets constituting a second capacitance. The base 1 is further provided with a second chipset electrically connected to the second capacitor bank, the second chipset also being located in the mounting slot 14.

Optionally, the second pole piece group includes at least one second pole piece, and the second metal piece group 24 includes at least one second metal piece, the plurality of second pole pieces and the plurality of second metal pieces form a plurality of second capacitors, and the plurality of second capacitors form a second capacitor group. The second chip set comprises a plurality of second chips, and the second chips are respectively and electrically connected with the second capacitors. When the carrier 3 moves along the optical axis direction Z, the relative area of the second pole piece and the second metal piece changes, so that the capacitance of the second capacitor changes, and the second chip can sense the capacitance of the second capacitor, so as to judge the position of the carrier 3. The second capacitor formed by the second pole piece and the second metal piece is used for replacing the existing sensor, so that the weight reduction of the lens driving mechanism 100 can be further improved.

The frame 2 is further provided therein with a first metal frame 22 electrically connected to the built-in wiring, and the first metal sheet group 23 and the second metal sheet group 24 are electrically connected to the first metal frame 22. The carrier 3 is further provided therein with a second metal frame 33 electrically connected to the built-in wiring, and the second pole piece group is electrically connected to the second metal frame 33.

The resetting element is an elastic element and can drive the carrier 3 to reset, and in the embodiment shown in the figure, the resetting element comprises an upper reed 4 and a lower reed 5, wherein the upper reed 4 and the lower reed 5 respectively have elasticity, and the upper reed is positioned at the top of the frame 2 and the carrier 3 and is connected with the top of the frame 2 and the carrier 3. The lower reed 5 is located at the bottom of the frame 2 and the carrier 3, and is connected to the bottom of the frame 2 and the carrier 3. After the carrier 3 moves, the upper reed 4 and the lower reed 5 can drive the carrier 3 to reset in cooperation. In addition, the upper reed 4 is electrically connected to the first metal frame 22 and the second metal frame 33.

The connecting piece comprises four suspension wires 7, the four suspension wires 7 extend along the optical axis direction Z and are positioned at four corners of the base 1, the tops of the four suspension wires 7 are respectively connected with the upper reed 4, the bottoms of the four suspension wires 7 are connected with the base 1, and the lengths of the four suspension wires 7 are slightly larger than the sizes of the frame 2 and the carrier 3 along the optical axis direction Z, so that the frame 2 and the carrier 3 are suspended above the base 1. After the frame 2 moves, the four suspension wires 7 can also drive the frame 2 to reset.

Some of the four suspension wires 7 or all of the suspension wires 7 may be electrically conductive, and the bottom end is electrically connected with the built-in circuit of the base 1 and the top end is electrically connected with the upper reed 4. One part of the upper reed 4 is electrically connected to the first metal frame 22 of the frame 2, and the other part is electrically connected to the second coil group 31 and the second metal frame 33 of the carrier 3. That is, the current of the built-in circuit of the base 1 can flow into the first metal sheet group 23 and the second metal sheet group 24 through the suspension wire 7, the upper reed 4 and the first metal frame 22, and can also flow into the second coil group 31 and the second pole sheet group through the suspension wire 7 and the upper reed 4.

The housing 8 has an accommodation space and is open at the bottom. The outer shell 8 covers the outer parts of the frame 2, the carrier 3, the upper reed 4, the lower reed 5 and the four suspension wires 7, and the bottom is connected with the base 1 for protecting external foreign matters from damaging the lens or affecting shooting.

The utility model utilizes a plurality of electrode plates and a plurality of matched metal plates to form a plurality of capacitors, and utilizes the chip to sense the capacitance of the plurality of capacitors so as to detect the specific positions of the carrier 3 and the frame 2, thereby being capable of replacing the sensor in the prior art, greatly reducing the weight and the volume of the lens driving mechanism 100 and facilitating the lighter weight of the lens driving mechanism 100. Further, by changing the distribution of the first magnet group 211 and the second magnet group 212, the driving force for the movement of the driving frame 2 and the carrier 3 can be improved.

While the preferred embodiments of the present utility model have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims

1. A lens driving mechanism, characterized by comprising:

a second magnet group;

the support piece is connected with the reset piece and the base.

2. The lens driving mechanism according to claim 1, wherein polarities of the second magnet group are distributed in the optical axis direction.

3. The lens driving mechanism according to claim 1, wherein the first magnet group is aligned with the first coil group in the optical axis direction, the first metal sheet group being located on a side of the first magnet group facing the first coil group; the first pole piece group is positioned on the side surface of the first coil group facing the first magnet group.

4. The lens driving mechanism according to claim 1, wherein the first pole piece group includes a plurality of first pole pieces; the first metal sheet group comprises a plurality of first metal sheets, a plurality of first electrode sheets and a plurality of first metal sheets form a plurality of first capacitors, and a plurality of first capacitors form the first capacitor group.

5. The lens driving mechanism as claimed in claim 4, wherein the plurality of first chip sets includes a plurality of first chips, the plurality of first chips being electrically connected to the first chips, respectively.

6. The lens driving mechanism according to claim 1, wherein the mount includes:

7. The lens driving mechanism according to claim 6, wherein the second magnet group includes a plurality of second magnets, the plurality of second magnets are stacked in the optical axis direction and polarities of the second magnets are distributed in the optical axis direction.

8. The lens driving mechanism according to claim 7, wherein the second magnet group is aligned with the second coil group in a second direction, the second direction being perpendicular to the optical axis direction;

9. The lens driving mechanism according to claim 8, wherein a first metal frame electrically connected to the built-in wiring is further provided in the frame, and the first metal sheet group and the second metal sheet group are electrically connected to the first metal frame; and a second metal frame electrically connected with the built-in circuit is further arranged in the carrier, and the second pole piece group is electrically connected with the second metal frame.

10. The lens driving mechanism of claim 8, wherein the second pole piece group comprises at least one second pole piece; the second metal sheet group comprises at least one second metal sheet, and the second electrode sheet and the second metal sheet form a second capacitor; the second capacitor group includes at least one of the second capacitors.