CN111726508A

CN111726508A - Lens module

Info

Publication number: CN111726508A
Application number: CN202010642927.0A
Authority: CN
Inventors: 陶泽; 李杨
Original assignee: Science and Education City Branch of AAC New Energy Development Changzhou Co Ltd
Current assignee: Science and Education City Branch of AAC New Energy Development Changzhou Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-09-29
Also published as: WO2022007182A1; CN111953881A

Abstract

The invention provides a lens module, which comprises a shell with an accommodating space, a lens accommodated in the accommodating space, a sensor assembly and a driving device, wherein the sensor assembly is movably accommodated in the accommodating space and is arranged opposite to the lens along the optical axis direction of the lens, and the driving device drives the sensor assembly to move along/around the optical axis direction or along the direction vertical to the optical axis relative to the lens. Compared with the prior art, the lens module increases the shake compensation freedom degree by moving the image sensor, namely, compensates the shake rotating around the optical axis, thereby improving the optical anti-shake effect; the driving device directly drives the image sensor to move, so that the structure is simple, and the occupied volume is small; the image sensor is small in size, the movable space reserved for the sensor assembly by the shell is small, the size of the shell can be reduced, and the axial thickness of the lens module is reduced.

Description

Lens module

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of optical imaging of a lens, in particular to a lens module.

[ background of the invention ]

With the development of the camera technology, the lens module is widely used in various camera devices, and the combination of the lens module and various portable electronic devices such as mobile phones, video cameras, computers, etc. is more popular among consumers.

When a user uses the portable electronic device to take a picture or record a video, the shake of the portable electronic device can cause the position deviation of an imaging light beam on the photosensitive surface of the image sensor, so that the picture or the video is blurred. The optical anti-shake technique is a technique for compensating the offset by moving (translating, rotating) the lens module, so as to make the shot picture or video clearer.

In the related art, the lens module comprises a shell, a lens contained in the shell, a coil arranged in the shell, magnetic steel arranged on the lens and an image sensor arranged opposite to the lens, wherein when the lens module shakes, the coil is electrified to generate a magnetic field and act on the magnetic field of the magnetic steel, so that the magnetic steel drives the lens to move to compensate the lens module for shaking and the deviation of an imaging light beam generated on the image sensor. However, the shift lens cannot compensate for a shake rotating around the optical axis.

Another related art lens module includes an auto-focus module and an optical anti-shake module, the auto-focus module is disposed in the optical anti-shake module through a plurality of elastic supporting members, and is driven by a plurality of shape memory alloy wires to realize auto-focus and optical anti-shake functions, the lens module moves the lens along the optical axis direction of the lens during auto-focus, and moves the lens along the optical axis direction perpendicular to the lens during optical anti-shake function. However, the driving force of the auto-focusing assembly acts on the lens, and the driving force of the optical anti-shake assembly acts on the lens and the sensor, so that an additional structural member is required to connect the lens and the image sensor, and the volume of the lens module is increased; the whole camera module is moved through the optical anti-shake component to realize optical anti-shake, and under the same shake compensation angle, the movement space required to be reserved is large, so that the size of the lens module in the optical axis direction is increased.

Therefore, a new lens module is needed to solve the above-mentioned problems.

[ summary of the invention ]

The invention aims to provide a lens module which can compensate the shake rotating around an optical axis, has small volume and can reduce the axial thickness.

In order to achieve the above object, the present invention provides a lens module, including: a housing having an accommodating space; the lens is accommodated in the accommodating space; the sensor assembly is movably accommodated in the accommodating space and is opposite to the lens along the optical axis direction of the lens; and the driving device is accommodated in the accommodating space and drives the sensor assembly to move along/around the optical axis direction or along the direction vertical to the optical axis relative to the lens.

Preferably, the sensor assembly includes a substrate and an image sensor disposed on the substrate and close to one side of the lens, the driving device includes a first driving member and a second driving member disposed oppositely, the first driving member is disposed on the substrate, the second driving member is fixed to the lens or the housing, and the first driving member and the second driving member interact with each other to enable the sensor assembly to move along a direction perpendicular to the optical axis.

Preferably, the casing still includes the fixed part that projects to the casing center from shells inner wall, the camera lens install in the fixed part, the second driving piece is fixed in the fixed part with the one end that the base plate is relative, first driving piece with the second driving piece sets up along the optical axis direction relatively.

Preferably, the driving device further includes a third driving member disposed in the housing, and the third driving member interacts with the second driving member to move the sensor assembly along the direction of the optical axis of the lens.

Preferably, the first driving part is magnetic steel, and the second driving part and the third driving part are coils.

Preferably, the first driving member and the second driving member are oppositely arranged in the optical axis direction; the first driving member and the third driving member are oppositely arranged along a direction perpendicular to the optical axis.

Preferably, the magnetizing direction of the first driving member is perpendicular to the optical axis direction.

Preferably, the driving device further includes a third driving element disposed in the housing and a fourth driving element disposed on the substrate, and the third driving element and the fourth driving element interact with each other to move the image sensor along the optical axis direction.

Preferably, the first driving member and the second driving member are oppositely arranged in the optical axis direction; the third driving piece and the fourth driving piece are arranged oppositely along the direction perpendicular to the optical axis, and the first driving piece is positioned between the image sensor and the fourth driving piece.

Preferably, the first driving part and the fourth driving part are both magnetic steels, and the second driving part and the third driving part are both coils.

Preferably, the magnetizing direction of the first driving member is perpendicular to the optical axis direction, and the magnetizing direction of the fourth driving member is parallel to the optical axis direction.

Preferably, the sensor assembly further comprises a flexible circuit board, and the flexible circuit board is fixedly connected with the substrate and electrically connected with the image sensor through the substrate.

Preferably, the lens module further includes an elastic connector, the elastic connector connects the housing and the sensor assembly, so that the sensor assembly can be movably accommodated in the housing.

Compared with the prior art, the lens module increases the shake compensation freedom degree by moving the image sensor, namely, compensates the shake rotating around the optical axis, thereby improving the optical anti-shake effect; the driving device directly drives the image sensor to move, so that the structure is simple, and the occupied volume is small; the image sensor is small in size, the movable space reserved for the sensor assembly by the shell is small, the size of the shell can be reduced, and the axial thickness of the lens module is reduced.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a schematic cross-sectional view illustrating a first embodiment of a lens module according to the present invention, the lens module including a lens and a sensor assembly;

FIG. 2 is a schematic diagram of the sensor assembly shown in FIG. 1 after moving in a direction perpendicular to the optical axis of the lens;

FIG. 3 is a schematic cross-sectional view illustrating a lens module according to a second embodiment of the present invention;

FIG. 4 is a schematic diagram of the sensor assembly shown in FIG. 3 after moving in a direction perpendicular to the optical axis of the lens;

FIG. 5 is a schematic diagram of the sensor assembly shown in FIG. 3 after moving along the optical axis of the lens;

fig. 6 is a schematic cross-sectional structure view of a lens module according to a third embodiment of the invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1-2 show a first embodiment of the present invention, and referring to fig. 1-2, a lens module 100 includes a housing 10 having an accommodating space, a lens 20 accommodated in the accommodating space of the housing 10, a sensor assembly 30, a driving device 40, and an elastic connecting member 61, wherein the sensor assembly 30 and the lens 20 are disposed opposite to each other along an optical axis direction of the lens 20, and the elastic connecting member 61 connects the housing 10 and the sensor assembly 30, so that the sensor assembly 30 can be movably accommodated in the accommodating space of the housing 10. The driving device 40 is used for driving the sensor assembly 30 to move relative to the lens 20, so as to realize the anti-shake and auto-focusing functions of the lens module 100. Optionally, the elastic connection 61 is a spring or an elastic metal sheet.

Specifically, the sensor assembly 30 includes a substrate 31, an image sensor 32 disposed on the substrate 31 and close to the lens 20, and a flexible circuit board 33 fixedly connected to the substrate 31, wherein the flexible circuit board 33 is electrically connected to the image sensor 32 through the substrate 31 for data transmission.

The substrate 31 is connected to the inner wall of the housing 10 by the elastic member, so that the sensor assembly 30 is movably mounted in the housing 10. When the lens module 100 shakes, the driving device 40 drives the sensor assembly 30 to move, and the sensor assembly 30 moves along the direction of the force applied by the driving device 40 to compensate the offset of the lens module 100 caused by the shake. The image sensor 32 of the lens module 100 transmits data through the flexible circuit board 33, and the flexible circuit board 33 has low rigidity and small resistance to the driving device 40, so that the driving force of the driving device 40 can be reduced.

In other embodiments, the sensor assembly 30 may further include a filter, and the driving device 40 drives the filter to move.

The driving device 40 includes a first driving member 41 and a second driving member 42 capable of generating a magnetic field, and either one of the first driving member 41 and the second driving member 42 generates a constant magnetic field while the other generates a varying magnetic field. The first driving member 41 is disposed on the substrate 31, the second driving member 42 is disposed at an end of the lens 20 opposite to the substrate 31, and the first driving member 41 and the second driving member 42 are disposed opposite to each other. The magnetic fields generated by the first driving element 41 and the second driving element 42 are different, and under the interaction of the respective magnetic fields of the first driving element 41 and the second driving element 42, the sensor assembly 30 moves in a direction perpendicular to the optical axis of the lens 20, i.e. in a direction perpendicular to the Z-axis, such as in the X-direction (as shown in fig. 2) or rotates around the Z-axis, so as to compensate for the offset of the lens module 100 caused by shake, so that the lens module 100 has an anti-shake function. Alternatively, the first driving member 41 is a coil capable of generating a variable magnetic field, and the second driving member 42 is a magnetic steel capable of generating a constant magnetic field. In other embodiments, the drive device 40 may be a memory alloy motor or a MEMS motor.

In addition, since the sensor assembly 30 has a small volume, the movement space of the housing 10 reserved for the sensor assembly 30 is also small, so that the volume of the housing 10 can be reduced, and the axial thickness of the lens module 100 is reduced. The sensor assembly 30 has a small structure and light weight, and the driving force required for driving the sensor assembly 30 is small, so that the driving force requirement of the driving device 40 is reduced; the sensor assembly 30 and the driving device 40 can flexibly adapt to the lenses 20 with different specifications, and the development period of the lens module is shortened.

The lens module 100 further includes a fifth driving element 51 disposed on the lens 20 and a sixth driving element 52 disposed on the inner wall of the housing 10, the lens 20 is connected to the housing 10 through an elastic connection element 62, and the fifth driving element 51 interacts with the sixth driving element 52 to move the lens 20 along the Z-axis direction, so as to achieve auto-focusing of the lens module 100. Optionally, the fifth driving element 51 is a magnetic steel, and the sixth driving element 52 is a coil.

Fig. 3-5 illustrate a second embodiment of the present invention, in which the lens module 200 of the present embodiment includes a housing 10 ', a lens 20 ' accommodated in the housing 10 ', a sensor assembly 30 ', a driving device 40 ', and an elastic connecting member 61 ', wherein the sensor assembly 30 ' is disposed opposite to the lens 20 ', and the elastic connecting member 61 ' connects the housing 10 ' and the sensor assembly 30 ' such that the sensor assembly 30 ' is movably accommodated in the housing 10 '.

Specifically, the housing 10 'includes a fixing portion 11' protruding from an inner wall of the housing 10 'toward a center of the housing 10', and the lens 20 'is mounted on the fixing portion 11'.

The sensor assembly 30 'includes a substrate 31', an image sensor 32 'disposed on the substrate 31', and a flexible printed circuit 33 'fixedly connected to the substrate 31'. The elastic connection member 61 ' connects the substrate 31 ' and the inner wall of the housing 10 ', so that the sensor assembly 30 ' is movably mounted in the housing 10 '.

The driving device 40 'includes a first driving member 41', a second driving member 42 'and a third driving member 43', the first driving member 41 'is fixed on the substrate 31', the second driving member 42 'is fixed on the fixing portion 11' and the end opposite to the substrate 31 ', the second driving member 42' and the first driving member 41 'are oppositely arranged along the optical axis direction, and the third driving member 43' is fixed on the inner wall of the housing 10 'and directly faces one side of the first driving member 41'. The first driver 41 'and the third driver 43' are disposed oppositely in a direction perpendicular to the optical axis. Optionally, the first driving element 41 ' is a magnetic steel, and the second driving element 42 ' and the third driving element 43 ' are both coils. The magnetizing direction of the first driver 41' is perpendicular to the optical axis.

When the lens module 200 'works, the second driving element 42' and the third driving element 43 'are energized to generate magnetic fields, and the magnetic fields of the first driving element 41' and the second driving element 42 'interact with each other, so that the sensor assembly 30' moves in a direction perpendicular to the optical axis of the lens 20 ', and the anti-shake function of the lens module 200' is realized; the third driving member 43 ' interacts with the second driving member 42 ' to move the sensor assembly 300 ' along the direction of the optical axis of the lens 20 ', i.e., along the Z-axis direction, to achieve auto-focusing of the lens module 100 '. That is, the lens module 200 'can achieve the anti-shake and auto-focusing functions by the second driving element 42' and the third driving element 43 'acting on the first driving element 41', and has the advantages of simple structure, small occupied volume, and further reduced overall size of the lens module 200.

Fig. 6 is a third embodiment of the present invention, and the lens module 300 of the present embodiment includes a housing 10 ', a lens 20 ' accommodated in the housing 10 ', a sensor assembly 30 ', a driving device 40 ', and an elastic connecting member 61 ', wherein the sensor assembly 30 ' is disposed opposite to the lens 20 ', and the elastic connecting member 61 ' connects the housing 10 ' and the sensor assembly 30 ', so that the sensor assembly 30 ' is movably accommodated in the housing 10 '.

Specifically, the housing 10 'includes therein a fixing portion 11' protruding from an inner wall of the housing 10 'toward a center of the housing 10', and the lens 20 'is mounted to the fixing portion 11'.

The sensor assembly 30 'includes a substrate 31', an image sensor 32 'disposed on the substrate 31', and a flexible circuit board 33 'fixedly connected to the substrate 31'. The elastic connector 61 ' connects the substrate 31 ' with the inner wall of the housing 10 ', thereby movably mounting the sensor assembly 30 ' in the housing 10 '.

The driving device 40 'includes a first driving member 41', a second driving member 42 ', a third driving member 43', and a fourth driving member 44 ', the first driving member 41' and the fourth driving member 44 'are fixed to the substrate 31', the second driving member 42 'is fixed to an end of the fixing portion 11' opposite to the substrate 31 ', the second driving member 42' is disposed opposite to the first driving member 41 ', and the third driving member 43' is fixed to an inner wall of the housing 10 'and faces the fourth driving member 44'. Optionally, the first driving element 41 'and the fourth driving element 44' are both magnetic steel, and the second driving element 42 'and the third driving element 43' are both coils. The first driving member 41 'and the second driving member 42' are disposed opposite to each other in the optical axis direction; the third driving member 43 ' and the fourth driving member 44 ' are disposed opposite to each other along a direction perpendicular to the optical axis, and the first driving member 41 ' is disposed between the image sensor 32 ' and the fourth driving member 44 '. The magnetization direction of the first driving member 41' is perpendicular to the optical axis direction. The magnetization direction of the fourth driving member 44' is parallel to the optical axis direction.

In operation, the second driving element 42 ' and the third driving element 43 ' are energized to generate magnetic fields, and the magnetic fields of the first driving element 41 ' and the second driving element 42 ' interact with each other to move the sensor assembly 30 ' in a direction perpendicular to the optical axis of the lens 20 ', so as to achieve the anti-shake function of the lens module 300 '; the third driving member 43 ' and the fourth driving member 44 ' interact with each other by magnetic fields to move the sensor assembly 30 ' along the direction of the optical axis of the lens 20 ', i.e. along the Z-axis direction, so as to achieve the auto-focusing of the lens module 300 '.

Compared with the prior art, the lens module increases the shake compensation freedom degree by moving the image sensor, namely, compensates the shake rotating around the optical axis, thereby improving the optical anti-shake effect; the driving device directly drives the image sensor to move, so that the structure is simple, and the occupied volume is small; the sensor assembly is small in size, the movable space reserved for the sensor assembly by the shell is small, the size of the shell can be reduced, and the axial thickness of the lens module is reduced.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. The lens module, characterized in that, the lens module includes:

a housing having an accommodating space;

the lens is accommodated in the accommodating space;

the sensor assembly is movably accommodated in the accommodating space and is opposite to the lens along the optical axis direction of the lens; and

and the driving device is accommodated in the accommodating space and drives the sensor assembly to move along/around the optical axis direction or along the direction vertical to the optical axis relative to the lens.

2. The lens module as claimed in claim 1, wherein the sensor assembly includes a substrate and an image sensor disposed on a side of the substrate adjacent to the lens, the driving device includes a first driving member and a second driving member disposed opposite to each other, the first driving member is disposed on the substrate, the second driving member is fixed to the lens or the housing, and the first driving member and the second driving member interact with each other to move the sensor assembly in a direction perpendicular to the optical axis.

3. The lens module as claimed in claim 2, wherein the housing further includes a fixing portion protruding from an inner wall of the housing toward a center of the housing, the lens is mounted on the fixing portion, the second driving member is fixed to an end of the fixing portion opposite to the substrate, and the first driving member and the second driving member are disposed opposite to each other in the direction of the optical axis.

4. The lens module as claimed in claim 2, wherein the driving device further comprises a third driving member disposed in the housing, the third driving member interacting with the first driving member to move the sensor assembly along the direction of the optical axis of the lens.

5. The lens module as claimed in claim 4, wherein the first driving member is a magnetic steel, and the second driving member and the third driving member are coils.

6. The lens module as claimed in claim 4, wherein the first driving member and the second driving member are disposed opposite to each other along the optical axis; the first driving member and the third driving member are oppositely arranged along a direction perpendicular to the optical axis.

7. The lens module as claimed in claim 4, wherein the magnetization direction of the first driving member is perpendicular to the optical axis direction.

8. The lens module as claimed in claim 2, wherein the driving device further includes a third driving member disposed in the housing and a fourth driving member disposed on the substrate, the third driving member and the fourth driving member interacting with each other to move the image sensor along the optical axis.

9. The lens module as claimed in claim 8, wherein the first driving member and the second driving member are disposed opposite to each other in the optical axis direction; the third driving piece and the fourth driving piece are arranged oppositely along a direction perpendicular to an optical axis, and the first driving piece is located between the image sensor and the fourth driving piece.

10. The lens module as claimed in claim 8, wherein the first driving member and the fourth driving member are both magnetic steel, and the second driving member and the third driving member are both coils.

11. The lens module as claimed in claim 10, wherein the first driving member is magnetized in a direction perpendicular to the optical axis, and the fourth driving member is magnetized in a direction parallel to the optical axis.

12. The lens module as recited in claim 2, wherein the sensor assembly further comprises a flexible circuit board fixedly connected to the substrate and electrically connected to the image sensor through the substrate.

13. The lens module as recited in claim 1, further comprising a resilient connecting member connecting the housing and the sensor assembly, so that the sensor assembly is movably received in the housing.