WO2022041316A1

WO2022041316A1 - Lens driving device

Info

Publication number: WO2022041316A1
Application number: PCT/CN2020/114007
Authority: WO
Inventors: 李林珍; 卢继亮; 李刚; 张晋; 曹广凯
Original assignee: 诚瑞光学(常州)股份有限公司
Priority date: 2020-08-26
Filing date: 2020-09-08
Publication date: 2022-03-03
Also published as: CN211603677U

Abstract

A lens driving device, comprising: a base (11); a lens assembly (40), which comprises a lens support (21) mounted to the base (11), and a lens (4) supported by the lens support (21); a driving device (3) for driving the lens assembly (40) to move relative to the base (11); a ball support (13) connected between the base (11) and the lens assembly (40); and a third ball (12c), which is arranged between the base (11) and the lens support (21), and is used for guiding the lens assembly (40) to move, in a first direction and a second direction, relative to the base (11), wherein the movement distance of the third ball (12c) in the first direction is equal to the movement distance thereof in the second direction. The third ball (12c) is arranged between the base (11) and the lens support (21), such that the movement distance of the lens assembly (40) relative to the base (11) in the first direction and the movement distance thereof in the second direction are equal, thereby forming a lens driving device which has a simple and compact structure.

Description

lens drive

technical field

The present application relates to the technical field of optical devices, and in particular, to a lens driving device.

Background technique

The high-performance lens module configured on the existing portable terminal generally has an automatic adjustment function (AF, autofocusing) and optical image stabilization (OIS, optical image). stabilization). Optical Image Stabilization (OIS) reduces image blur caused by external vibrations or user's hand shake.

technical problem

In the related art optical anti-shake lens module, in order to realize the automatic adjustment function, an appropriate current must be supplied to the AF coil to realize the raising and lowering motion of the lens. In order to supply power to the AF coil outside the lens module, there must be parts such as suspension wires. However, it is very difficult to add suspension wires in the process of stacking many parts in series.

Therefore, it is necessary to provide a new type of lens driving device.

technical solutions

The purpose of the present application is to provide a lens driving device in which the lens moves at the same distance in the optical axis direction and the vertical optical axis direction relative to the base.

The technical solution of this application is as follows:

A lens driving device, comprising:

pedestal;

a lens assembly, including a lens holder mounted to the base, and a lens supported on the lens holder;

a driving device, the driving device is used to drive the lens assembly to move relative to the base;

a ball support, the ball support is connected between the base and the lens assembly;

a first ball, the first ball is arranged between the base and the ball bracket for guiding the ball bracket to drive the lens assembly to move in a first direction;

a second ball, the second ball is arranged between the ball support and the lens support for guiding the lens assembly to move in a second direction, the second direction being perpendicular to the first direction;

A third ball is arranged between the base and the lens holder, and is used to guide the lens assembly to move relative to the base in the first direction and the second direction, and the third ball moves along the first and second directions. The moving distance in the first direction is equal to the moving distance in the second direction.

As an improvement, the base is provided with a first guide groove for installing the third ball, the length of the first guide groove along the first direction is equal to the length along the second direction, and the lens holder is provided with a first guide groove along the first direction. There is a second guide groove corresponding to the first guide groove for installing the third ball, and the length of the second guide groove along the first direction and the length along the second direction are equal.

As an improvement, the first direction is the direction of the optical axis of the lens, the base is provided with a plurality of first V-shaped grooves for installing the first balls, and the first V-shaped grooves extend along the direction of the lens. extending in the direction of the optical axis; a third V-shaped groove corresponding to the first V-shaped groove is provided on the side of the ball bracket close to the base.

As an improvement, the lens bracket is provided with a plurality of second V-shaped grooves for installing the second balls, the second V-shaped grooves extend in a direction perpendicular to the optical axis, and the ball bracket is close to the A fourth V-shaped groove corresponding to the second V-shaped groove is provided on one side of the lens holder.

As an improvement, the lens driving device further includes a casing with a receiving space, and the base is accommodated in the casing and fixed to the casing.

As an improvement, the driving device includes a circuit board fixed to the housing, a first driving assembly for driving the lens assembly to move in a first direction, and a second driving assembly for driving the lens assembly to move in a second direction a drive assembly; the first drive assembly includes a first coil fixed on the housing and electrically connected to the circuit board, and a first magnetic steel fixed on the lens bracket and corresponding to the first coil; the The second driving assembly includes a second coil fixed on the casing and electrically connected to the circuit board, and a second magnetic steel fixed on the lens bracket and corresponding to the second coil.

As an improvement, the lens driving device includes a restoring magnetic steel disposed between the base and the lens support, and the restoring magnetic steel includes a first magnet disposed on the base and facing the ball support. A return magnet and a second return magnet disposed on the lens holder and facing the ball holder, the first return magnet and the second return magnet are oppositely arranged so as to attract each other to pull the base The seat, the ball support and the lens support are pressed against each other.

As an improvement, a magnetic conductive plate is provided on the side of the first magnetic steel and the second magnetic steel close to the lens bracket, and the magnetic conductive plate is used to weaken the first magnetic steel and the second magnetic steel. The interference of the second magnet to the recovery magnet.

As an improvement, the housing includes an upper cover plate, a lower cover plate, a first limit frame and a second limit frame that are jointly surrounded to form the receiving space, the first limit frame and the second limit frame The limit frame is used to limit the movement range of the lens along the first direction and the second direction.

beneficial effect

The beneficial effect of the present application is that: by arranging the third ball between the base and the lens holder, the length along the optical axis of the ball groove for accommodating the third ball on the base and the length of the ball groove for accommodating the third ball on the lens holder along the optical axis The lengths in the direction perpendicular to the optical axis are set equal, so that the moving distances of the lens relative to the base in the direction of the optical axis and the direction perpendicular to the optical axis are equal, thereby forming a lens driving device with a simple and compact structure.

Description of drawings

FIG. 1 is a perspective view of an embodiment of a lens driving device of the present application;

Fig. 2 is the sectional view of the I-I place in Fig. 1 of the application;

Fig. 3 is the exploded view of the partial structure of the lens drive device in Fig. 1;

Fig. 4 is the sectional view of II-II place in Fig. 1 of the application;

5 is a bottom view of the circuit board, the first coil and the second coil in FIG. 3;

Fig. 6 is the bottom view of the ball bracket in Fig. 3;

Fig. 7 is the bottom view of the lens holder in Fig. 3;

8 is an exploded view of the lens driving device of the present application;

FIG. 9 is a top view of the base of FIG. 3 .

Embodiments of the present invention

The present application will be further described below with reference to the accompanying drawings and embodiments.

Referring to FIGS. 1 to 9 , the lens driving device includes a first direction adjusting assembly 1 , a second direction adjusting assembly 2 , a driving device 3 , a lens assembly 40 and a housing 5 with a receiving space, and the first direction adjusting assembly 1 includes a base 11 and the first ball 12a, the second direction adjusting assembly 2 includes a second ball 12b and a ball holder 13, the lens assembly 40 includes a lens holder 21 and a lens 4, the lens 4 is fastened and arranged in the middle of the lens holder 21 and can follow the lens holder 21 Movement; the first ball 12a is arranged on the base 11 and abuts against the ball support 13, so that the base 11 is connected to the ball support 13 in a rolling connection through the first ball 12a, so as to guide the ball support 13 to drive the lens assembly 40 relative to the base 11 Move along the first direction, which is the optical axis direction of the lens 4 . The second ball 12b is disposed on the ball bracket 13 and abuts against the lens bracket 21, so as to guide the lens bracket 21 to drive the lens 4 to move in a second direction relative to the ball bracket 13, wherein the second direction is perpendicular to the first direction, that is, vertical in the direction of the optical axis. The housing 5 is of a combined structure as a whole. Specifically, the housing 5 includes an upper cover plate 51, a lower cover plate 52, a first limit frame 53 and a second limit frame 54 that together form a receiving space; The direction adjusting assembly 1 , the second direction adjusting assembly 2 , the lens assembly 40 and the driving device 3 are covered inside, and the casing 5 serves to limit and protect the first direction adjusting assembly 1 and the second direction adjusting assembly 2 . In this embodiment, the base 11 is fixed to the lower cover 52 .

As shown in FIGS. 3 and 4 , the driving device 3 includes a circuit board 31 fixed to the housing 5 , a first coil 32 , and a first magnetic steel 33 corresponding to the first coil 32 , wherein the first coil 32 and the first magnetic The steel 33 forms the first drive assembly; the circuit board 31 is electrically connected to the first coil 32 to drive the first coil 32 to generate a Lorentz force that causes the first magnet 33 to move in the first direction, the first magnet 33 and the lens holder 21 Fixed connection, thereby driving the lens holder 21 to move in the first direction, and then driving the lens 4 to move in the first direction, that is, driving the lens 4 to move along its own optical axis, so that the lens 4 can be adjusted automatically. The driving device 3 also includes a second coil 34 fixed on the housing 5 and electrically connected to the circuit board 31, and a second magnetic steel 35 fixed on the lens holder 21 and corresponding to the second coil 34, wherein the second coil 34 and the second The magnetic steel 35 forms a second driving component; the circuit board 31 is electrically connected with the second coil 34 to drive the second coil 34 to generate a Lorentz force that causes the second magnetic steel 35 to move in the second direction, and the second magnetic steel 35 is fixed on the lens on the bracket 21 , thereby driving the lens bracket 21 to move in the second direction, and then driving the lens 4 to move in the second direction, that is, driving the lens 4 to move along the vertical optical axis, so that the optical anti-shake adjustment can be performed on the lens 4 .

Preferably, the circuit board 31 may be a rigid circuit board or a flexible circuit board.

As shown in FIG. 3 , FIG. 7 and FIG. 9 , the base 11 is provided with a first guide groove 111 for installing the third ball 12 c , and the length L1 of the first guide groove 111 along the first direction is equal to the length L2 along the second direction Correspondingly, the lens bracket 21 is provided with a second guide groove 211 corresponding to the first guide groove 111 for installing the third ball 12c, and the length of the second guide groove 211 along the first direction is equal to the length along the second direction. . Preferably, the first guide groove 111 and the second guide groove 211 are symmetrically arranged.

Preferably, as shown in FIG. 3 and FIG. 7 , the first guide groove 111 and the second guide groove 211 are equidistant rectangular grooves, that is, square grooves; After the third ball 12c in the groove 211 abuts, the third ball 12c guides the lens holder 21 to move relative to the base 11 in the first direction and the second direction. Due to the movement distance of the third ball 12c in the first direction and the second direction The moving distances of the lens 4 are equal, so that the moving distances of the lens 4 in the first direction and the second direction are equal, that is, the moving distances of the lens 4 in the direction along the optical axis of the lens 4 and the direction perpendicular to the optical axis are equal.

As shown in FIG. 3 , FIG. 6 and FIG. 7 , the base 11 is further provided with three first V-shaped grooves 112 extending along the optical axis direction for installing the first balls 12 a , and the ball bracket 13 is close to the base 11 A third V-shaped groove 131 corresponding to the first V-shaped groove 112 is provided on one side of the lens holder 21; there are also three second V-shaped grooves 212 for installing the second ball 12b on the lens holder 21, and the second V-shaped groove 212 extends in the direction perpendicular to the optical axis, and a fourth V-shaped groove 132 corresponding to the second V-shaped groove 212 is provided on the side of the ball holder 13 close to the lens holder 21, so that the base 11 passes through the first ball 12a and The ball holder 13 is in contact with the lens holder 21 via the second ball 12b.

Preferably, the first direction adjustment assembly 1 , the second direction adjustment assembly 2 and the lens holder 21 are connected by magnetic compression. Specifically, as shown in FIG. 4 , a restoring magnetic steel is provided between the base 11 and the lens holder 21 6. The return magnet 6 includes a first return magnet 61 and a second return magnet 62 . Specifically, the first return magnet 61 is arranged on the base 11 and faces the ball bracket 13, and the second return magnet 62 is arranged on the lens bracket 21 and faces the ball bracket 13; through the first return magnet 61 and the second return magnet 62 The gravitational force between the magnets 62 presses the lens holder 21 and the second ball 12b on the ball holder 13, the ball holder 13 presses the first ball 12a on the base 11, and also presses the third ball through the lens holder 21. 12c is crimped on the base 11, thereby forming a lens driving device in which the first direction adjusting assembly 1, the second direction adjusting assembly 2 and the lens holder 21 are compactly connected. Preferably, the first return magnetic steel 61 is embedded on the base 11 and faces the ball bracket 13 . The second return magnet 62 is embedded on the lens holder 21 and faces the ball holder 13 . More, at the corners of the base 11 and the lens holder 21 are respectively provided 4 pieces of the first return magnetic steel 61 and 4 pieces of the second return magnetic steel 62, the first return magnetic steel 61 and the second return magnetic steel 62 Correspondingly, the base 11 , the ball support 13 and the lens support 21 are pressed against each other. It should also be noted that, in different usage situations, the quantity and position of the first restoring magnet 61 and the second restoring magnet 62 can be adjusted as required, as long as the distance between the base 11 , the ball support 13 and the lens support 21 is maintained. The force is uniform and the connection is stable and reliable. This embodiment does not limit the quantity and position of the first restoring magnetic steel 61 and the second restoring magnetic steel 62 .

Preferably, between the first magnetic steel 33 and the lens bracket 21, and between the second magnetic steel 35 and the lens bracket 21, a magnetic conductive plate 36 is provided, and the magnetic conductive plate 36 is used to weaken the first magnetic steel 33 and the second magnetic steel 33. The interference caused by the two magnetic steels 35 to the first restoring magnetic steel 61 and the second restoring magnetic steel 62 makes the overall connection performance of the lens driving structure stable and reliable.

As shown in FIG. 2 , FIG. 3 , FIG. 4 and FIG. 8 , the housing 5 is spaced apart from the first direction adjusting assembly 1 , the second direction adjusting assembly 2 , and the lens assembly 40 in the optical axis direction. On the one hand, the lens 4 is located in the housing 5 There is a certain movement space inside, and on the other hand, the movement range of the lens 4 can be limited. Specifically, the first limit frame 53 and the second limit frame 54 are used to limit the movement range of the lens 4 along the optical axis direction and the direction perpendicular to the optical axis, that is, limit the movement range of the lens 4 along the first direction and the second direction . Preferably, the first limiting frame 53 and the second limiting frame 54 are right-angle structures, the first limiting frame 53 is provided with a first channel 531 , and the second limiting frame 54 is provided with a second channel 541 , The first channel 531 and the second channel 541 are coaxially disposed and used for passing an image. The first channel 531 , the lens 4 and the second channel 541 form an image channel. Preferably, the first limiting frame 53 and the second limiting frame 54 are clamped on the protrusions 14 on the side of the base 11 . The upper cover plate 51 and the lower cover plate 52 are both plate-like structures, the upper cover plate 51 is covered and connected to the upper part of the first limit frame 53 and the second limit frame 54, and the lower cover plate 52 is covered and connected to the first limit frame. The lower part of the position frame 53 and the second limit frame 54 .

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

A lens driving device, comprising:

pedestal;

a lens assembly, including a lens holder mounted to the base, and a lens supported on the lens holder;

a driving device, the driving device is used to drive the lens assembly to move relative to the base;

a ball support, the ball support is connected between the base and the lens assembly;

a first ball, the first ball is arranged between the base and the ball bracket for guiding the ball bracket to drive the lens assembly to move in a first direction;

a second ball, the second ball is arranged between the ball support and the lens support for guiding the lens assembly to move in a second direction, the second direction being perpendicular to the first direction;

A third ball is arranged between the base and the lens holder, and is used to guide the lens assembly to move relative to the base in the first direction and the second direction, and the third ball moves along the first and second directions. The moving distance in the first direction is equal to the moving distance in the second direction.
The lens driving device according to claim 1, wherein the base is provided with a first guide groove for installing the third ball, and the length of the first guide groove along the first direction is equal to the length along the second direction. A second guide groove corresponding to the first guide groove is provided on the lens bracket for installing the third ball, and the length of the second guide groove along the first direction and along the The lengths in the second direction are equal.
The lens driving device according to claim 2, wherein the first direction is the optical axis direction of the lens, and the base is provided with a plurality of first V-shaped grooves for installing the first balls , the first V-shaped groove extends along the direction of the optical axis; the side of the ball bracket close to the base is provided with a third V-shaped groove corresponding to the first V-shaped groove.
The lens driving device according to claim 3, wherein the lens bracket is provided with a plurality of second V-shaped grooves for installing the second balls, and the second V-shaped grooves are perpendicular to the light Extending in the axial direction, a side of the ball bracket close to the lens bracket is provided with a fourth V-shaped groove corresponding to the second V-shaped groove.
The lens driving device according to claim 1, characterized in that, the lens driving device further comprises a casing having a receiving space, and the base is accommodated in the casing and fixed to the casing.
The lens driving device according to claim 5, wherein the driving device comprises a circuit board fixed to the housing, and a first driving component for driving the lens component to move in a first direction, and driving the lens component to move in a first direction. a second drive assembly that moves the lens assembly in a second direction; the first drive assembly includes a first coil fixed on the housing and electrically connected with the circuit board, and a first coil fixed on the lens bracket and connected to the first coil A first magnetic steel corresponding to a coil; the second drive assembly includes a second coil fixed on the housing and electrically connected to the circuit board, and a second coil fixed on the lens bracket and corresponding to the second coil Second magnet.
The lens driving device according to claim 6, wherein the lens driving device comprises a restoring magnetic steel provided between the base and the lens holder, and the restoring magnetic steel comprises a restoring magnetic steel provided on the base a first return magnet on the seat and facing the ball support, and a second return magnet on the lens support and toward the ball support; the first return magnet and the second return magnet The steels are positioned opposite to attract each other to compress the base, the ball holder and the lens holder against each other.
The lens driving device according to claim 7, wherein a magnetic conductive plate is provided on the side of the first magnetic steel and the second magnetic steel close to the lens bracket, and the magnetic conductive plate is used to weaken the The first magnet and the second magnet interfere with the recovery magnet.
The lens driving device according to claim 5, wherein the housing comprises an upper cover plate, a lower cover plate, a first limit frame and a second limit frame that together surround and form the accommodating space, the The first limit frame and the second limit frame are used to limit the movement range of the lens along the first direction and the second direction.