CN203745708U - Lens driving device - Google Patents

Abstract

The utility model discloses a lens driving device. The lens driving device comprises a casing, a circuit board, a supporting framework, a lens module, a first magnetic steel, a second magnetic steel, a first driving coil, a second driving coil, a first position detection unit and a second position detection unit, wherein the circuit board is fixed at the casing, the supporting framework is arranged in the casing and can move in a direction perpendicular to a lens light axis, the first magnetic steel is mounted on the supporting framework, the first driving coil and the second magnetic steel are mounted at the lens module, the second driving coil, the first position detection unit and the second position detection unit are mounted on the circuit board, the first driving coil and the first magnetic steel drive the lens module to move in a direction of the lens light axis, the second position detection unit and the second magnetic steel provide feedback and realizes fast focusing, the first position detection unit and the first magnetic steel feeds back jittering of the supporting framework, and the second driving coil and the first magnetic steel drive the supporting framework to move in the direction perpendicular to the lens light axis to realize the anti-jittering purpose.

Description

lens drive

【Technical field】

The utility model relates to the field of driving devices, in particular to a lens driving device.

【Background technique】

With the development of camera technology, lens driving devices are widely used in various camera devices. The combination of the lens driving device and various portable electronic devices such as mobile phones, video cameras, computers, etc., is favored by consumers.

However, the driving mechanism of the lens driving device used in common digital products is usually composed of a coil and a first magnetic steel. The coil is fixed on the outer periphery of the lens carrier. , thereby driving the lens carrier to move along the optical axis of the lens. However, this lens driving device does not have an anti-shake function, is not practical, and has a poor imaging effect.

Therefore, it is necessary to provide a new lens driving device to solve the above disadvantages.

【Content of utility model】

The utility model provides a new lens driving device with anti-shake function.

The purpose of this utility model is achieved in that:

A lens driving device, the lens driving device comprising:

an enclosure with a containment space;

a circuit board, the circuit board is mounted and held on the housing;

A lens module, the lens module includes a lens barrel capable of accommodating a lens;

a supporting frame, the lens module is arranged in the supporting frame;

a spring sheet, the spring sheet is connected to the lens module and the supporting frame;

a connecting piece, the connecting piece is arranged in the receiving space and connects the supporting frame and the housing so that the supporting frame can move along a direction perpendicular to the optical axis of the lens;

The first magnetic steel, the first magnetic steel is installed and fixed on the support frame, the first magnetic steel includes a first part and a second part, and the magnetization directions of the first part and the second part are perpendicular to the The direction of the optical axis of the lens, the first magnetic steel is provided with an inner surface close to the lens module and an outer surface far away from the lens module, and the first part and the second part are located between the inner surface and the outer surface The magnetization direction in the direction is opposite, the area on the inner surface of the first part is larger than the area on the inner surface of the second part, and the area on the outer surface of the first part is larger than the area on the outer surface of the second part. area;

a second magnetic steel, the second magnetic steel is installed and fixed on the lens barrel;

The first driving coil, the first driving coil is installed and fixed on the lens barrel, the first driving coil is arranged opposite to the inner surface of the first magnetic steel, the first driving coil and the first magnetic steel The electromagnetic interaction between the first parts enables the lens barrel to move along the direction of the optical axis of the lens;

The second driving coil, the second driving coil is installed and fixed on the circuit board and corresponds to the boundary between the first part and the second part of the first magnetic steel, the second driving coil and the first magnetic steel The outer surfaces of the magnetic steel are oppositely arranged, and the electromagnetic interaction between the second drive coil and the first magnetic steel enables the support frame to move along a direction perpendicular to the optical axis of the lens;

A first position detection unit, the first position detection unit is installed and fixed on the circuit board and arranged in the center hole of the second drive coil, the first detection unit cooperates with the first magnetic steel, and feeding back the displacement of the supporting frame in a direction perpendicular to the optical axis of the lens.

The second position detection unit, the second position detection unit is installed and fixed on the circuit board and is arranged opposite to the second magnetic steel, the second detection unit cooperates with the second magnetic steel, and feeds back the The lens barrel is displaced in a direction along the optical axis of the lens.

Preferably, the support frame is provided with a housing portion for housing the second position detection unit, the circuit board is bent and extended into the housing portion, and the second position detection unit is installed and fixed in the housing portion.

Preferably, the supporting frame includes a first frame, a second frame, a third frame and a fourth frame which are sequentially stacked and assembled, and the second frame and the third frame cooperate to form an installation for holding the first magnetic steel. department.

Preferably, the spring piece includes an upper spring piece and a lower spring piece, one end of the upper spring piece is held on the upper end of the lens barrel, and the other end is clamped and held between the first frame and the second frame , one end of the lower spring piece is held on the lower end of the lens barrel, and the other end is sandwiched and held between the third frame and the fourth frame.

Preferably, the housing includes a base and a cover that cooperates with the base to form a housing space, the first frame is farther away from the base than the fourth frame, and the connecting piece connects the first frame and the base so that the connecting piece can support the supporting frame and is arranged on the base, and the fourth frame is arranged at a certain distance from the base.

Preferably, the first part and the second part of the first magnet are independent magnets.

Preferably, the area on the inner surface of the first part is at least three times the area on the inner surface of the second part, and the area on the outer surface of the first part is at least three times that of the second part on the outer surface. 3 times the area.

Preferably, the second driving coil is symmetrical about the boundary line between the first part and the second part of the first magnet.

Preferably, the first position detection unit and the second position detection unit are Hall elements.

Preferably, the number of the first magnets is 4, and the number of the corresponding second drive coils is also 4, and the 4 first magnets and the 4 second drive coils are about parallel The centerline of the optical axis of the lens is centrosymmetric.

The utility model has the advantages that: the lens driving device provided by the utility model has anti-shake function and fast focus function.

【Description of drawings】

Fig. 1 is the three-dimensional exploded view of the lens driving device provided by the utility model;

Fig. 2 is a perspective view of the lens driving device provided by the present invention without the cover, the yoke and the circuit board;

3 is a perspective view of the lens driving device provided by the present invention without the cover, the upper spring and the circuit board;

4 is a cross-sectional view of the lens driving device provided by the present invention;

Fig. 5 is a schematic diagram of assembly of the first magnet, the first driving coil and the second driving coil of the lens driving device provided by the present invention;

Fig. 6 is a schematic diagram of assembly of the circuit board, the second magnet and the second detection unit of the lens driving device provided by the present invention.

【Detailed ways】

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figures 1 to 6, it is a lens driving device A provided by the utility model, and the lens driving device A includes a housing, a circuit board 81, a connector 100, a lens module 20, a supporting frame 30, a spring sheet, first magnetic steel 61 , second magnetic steel 62 , first drive coil 51 , second drive coil 52 , first position detection unit 91 , second position detection unit 92 .

The housing includes a base 11 and a cover 12 cooperating with the base 11 to enclose a receiving space.

The circuit board 81 is fixed on the casing.

The support frame 30 is accommodated in the housing accommodation space, and the support frame 30 includes a first frame 31, a second frame 32, a third frame 33 and a fourth frame 34 which are sequentially stacked and assembled. The first frame 31 Compared with the fourth frame 34 , which is further away from the base 11 , the first frame 31 to the fourth frame 34 are assembled together through the cooperation of the cylinder 101 and the receiving hole 102 for receiving the cylinder 101 .

The connector 100 is arranged in the housing space to connect the support frame 30 and the base 11 so that the connector 100 can support the support frame 30 and be arranged on the base 11, and the fourth frame 34 and the base 11 are arranged at a certain distance, and the connecting member 100 is an elastic filament with supporting capacity. Of course, it can be replaced that the connecting piece 100 can also connect the support frame 30 and the cover body 12 to achieve the same effect so that the support frame 30 is arranged on the base 11, and the connection between the fourth frame 34 and the base 11 set at a certain distance between them.

The lens module 20 is accommodated in the support frame 30 , and the lens module 20 includes a lens (not shown) and a lens barrel 21 for holding the lens.

The spring piece connects the lens module 20 and the supporting frame 30, the spring piece includes an upper spring piece 71 and a lower spring piece 72, and one end of the upper spring piece 71 is fixed on the upper end 21a of the lens barrel 21 , the other end is clamped and held between the first frame 31 and the second frame 32, one end of the lower spring piece 72 is fixed on the lower end 21b of the lens barrel 21, and the other end is clamped and held on the first frame 32. between the third frame 33 and the fourth frame 34 .

The first magnetic steel 61 is installed and held on the support frame 30, wherein the second frame 32 and the third frame 33 cooperate to form a mounting portion for installing and holding the first magnetic steel 61, and the first magnetic steel Steel 61 is elongated magnetic steel. The first magnetic steel 61 includes a first part 611 and a second part 612, the magnetization directions of the first part 611 and the second part 612 are both perpendicular to the direction of the optical axis of the lens, and the first magnetic steel 61 is set There is an inner surface 61a close to the lens module 20 and an outer surface 61b away from the lens module 20, and the magnetization directions of the first part 611 and the second part 612 in the direction from the inner surface 61a to the outer surface 61b on the contrary. The area of the first portion 611 on the inner surface 61a is at least three times the area of the second portion 612 on the inner surface 61a, and the area of the first portion 611 on the outer surface 61b is at least three times that of the second portion 612 3 times the area of the outer surface 61b, the polarity of the first part 611 and the second part 612 on the inner surface 61a of the first magnetic steel 61 are opposite, and the first part 611 on the outer surface 61b of the first magnetic steel 61 The polarity of the second portion 612 is also reversed. In this embodiment, there are four first magnets 61, and the four first magnets 61 are symmetrical about the center line parallel to the optical axis of the lens. The first part 611 and the second part 612 of the first magnetic steel 61 may be formed by splicing two independent magnets. The lens driving device A is further provided with a magnetic yoke 41 , the magnetic yoke 41 is fixed on the supporting frame 30 and attached to the outer surface 61 b of the first magnetic steel 61 .

The second magnetic steel 62 is installed and fixed on the lens barrel 21 .

The first drive coil 51 is installed and fixed on the lens barrel 21, the first drive coil 51 is opposite to the inner surface 61a of the first magnet 61, and the first drive coil 51 is connected to the first magnet. The electromagnetic interaction between the first part 611 of the steel 61 enables the lens barrel 21 to move along the direction of the optical axis of the lens;

The second driving coil 52 is mounted and fixed on the circuit board 81 and arranged at the boundary between the first part 611 and the second part 612 of the first magnetic steel 61, the second driving coil 52 and the first magnetic steel 61 The outer surface 61b of a magnetic steel 61 is oppositely arranged, and the electromagnetic interaction between the second drive coil 52 and the first magnetic steel 61 enables the support frame 30 to move along a direction perpendicular to the optical axis of the lens, so The second drive coil 52 is symmetrical with respect to the boundary line between the first part 611 and the second part 612 of the first magnet 61, and there are four corresponding second drive coils 52, and the four second drive coils 52 It is also centrosymmetric about a center line parallel to the optical axis of the lens.

The first position detection unit 91 is installed and fixed on the circuit board 81 and disposed in the central hole of the second driving coil 52 . The first position detection unit 91 is preferably a Hall element, and the first position detection unit 91 senses the shaking of the support frame 30, that is, the displacement of the support frame 30 in a direction perpendicular to the optical axis of the lens, and feeds back to the first position detection unit 91. Two drive coils 52, the electromagnetic interaction between the second drive coil 52 and the first magnetic steel 61 enables the support frame 30 to move in a direction perpendicular to the optical axis of the lens, thereby achieving the purpose of anti-shake .

The second position detection unit 92 is installed and fixed on the circuit board 81 and is opposite to the second magnet 92 . The support frame 30 is provided with a housing portion 301 for housing the second position detection unit 92, the circuit board 81 is bent and extended into the housing portion 301, and the second position detection unit 92 is installed and fixed in the housing portion Inside 301. The second detection unit 92 is preferably a Hall element, the second position detection unit 92 senses the position of the lens barrel 21, and feeds back the displacement of the lens barrel 21 to the circuit board in the direction along the optical axis of the lens. 81, to adjust the input current, so that the lens driving device A can quickly and accurately realize the focusing function.

The above are only preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, but any equivalent modification or change made by those of ordinary skill in the art according to the content disclosed in the present utility model, All should be included in the scope of protection described in the claims.

Claims (10)

1. A lens driving device, characterized in that, said lens driving device comprises: an enclosure with a containment space; a circuit board, the circuit board is mounted and held on the housing; A lens module, the lens module includes a lens barrel capable of accommodating a lens; a supporting frame, the lens module is arranged in the supporting frame; a spring sheet, the spring sheet is connected to the lens module and the supporting frame; a connecting piece, the connecting piece is arranged in the receiving space and connects the supporting frame and the housing so that the supporting frame can move along a direction perpendicular to the optical axis of the lens; The first magnetic steel, the first magnetic steel is installed and fixed on the support frame, the first magnetic steel includes a first part and a second part, and the magnetization directions of the first part and the second part are perpendicular to the The direction of the optical axis of the lens, the first magnetic steel is provided with an inner surface close to the lens module and an outer surface far away from the lens module, and the first part and the second part are located between the inner surface and the outer surface The magnetization direction in the direction is opposite, the area on the inner surface of the first part is larger than the area on the inner surface of the second part, and the area on the outer surface of the first part is larger than the area on the outer surface of the second part. area; a second magnetic steel, the second magnetic steel is installed and fixed on the lens barrel; The first driving coil, the first driving coil is installed and fixed on the lens barrel, the first driving coil is arranged opposite to the inner surface of the first magnetic steel, the first driving coil and the first magnetic steel The electromagnetic interaction between the first parts enables the lens barrel to move along the direction of the optical axis of the lens; The second driving coil, the second driving coil is installed and fixed on the circuit board and corresponds to the boundary between the first part and the second part of the first magnetic steel, the second driving coil and the first magnetic steel The outer surfaces of the magnetic steel are oppositely arranged, and the electromagnetic interaction between the second drive coil and the first magnetic steel enables the support frame to move along a direction perpendicular to the optical axis of the lens; A first position detection unit, the first position detection unit is installed and fixed on the circuit board and arranged in the center hole of the second drive coil, the first detection unit cooperates with the first magnetic steel, and feeding back the displacement of the supporting frame in a direction perpendicular to the optical axis of the lens. The second position detection unit, the second position detection unit is installed and fixed on the circuit board and is arranged opposite to the second magnetic steel, the second detection unit cooperates with the second magnetic steel, and feeds back the The lens barrel is displaced in a direction along the optical axis of the lens. 2. The lens driving device according to claim 1, wherein the supporting frame is provided with a housing portion for housing the second position detection unit, the circuit board is bent and extended into the housing portion, and the second The position detection unit is installed and fixed in the accommodating part. 3. The lens driving device according to claim 1, wherein the supporting frame comprises a first frame, a second frame, a third frame and a fourth frame which are sequentially stacked and assembled, and the second frame and the first frame The three frames cooperate to form an installation part for installing and holding the first magnetic steel. 4. The lens driving device according to claim 3, wherein the spring piece comprises an upper spring piece and a lower spring piece, one end of the upper spring piece is fixed on the upper end of the lens barrel, and the other end is clamped It is fixed between the first frame and the second frame, one end of the lower spring piece is fixed on the lower end of the lens barrel, and the other end is sandwiched and fixed between the third frame and the fourth frame. 5. The lens driving device according to claim 4, wherein the housing includes a base and a cover that cooperates with the base to form a housing space, and the first frame is farther away from the fourth frame The base, the connecting piece connects the first frame and the base so that the connecting piece can support the supporting frame to be arranged on the base, and the fourth frame is spaced from the base Set at a certain distance interval. 6. The lens driving device according to claim 1, wherein the first part and the second part of the first magnetic steel are independent magnets. 7. The lens driving device according to claim 1, wherein the area on the inner surface of the first part is at least 3 times the area on the inner surface of the second part, and the area on the outer surface of the first part is The area on the surface is at least three times the area on the outer surface of the second portion. 8 . The lens driving device according to claim 7 , wherein the second driving coil is symmetrical with respect to a boundary line between the first part and the second part of the first magnet. 9. The lens driving device according to claim 1 or 7, wherein the first position detection unit and the second position detection unit are Hall elements. 10. The lens driving device according to claim 9, characterized in that, the number of the first magnets is four, and the corresponding number of the second driving coils is also four, and the four The first magnetic steel and the four second driving coils are symmetrical about the center line parallel to the optical axis of the lens.