CN114002802A

CN114002802A - Lens module

Info

Publication number: CN114002802A
Application number: CN202111453040.8A
Authority: CN
Inventors: 刘述伦; 夏念明; 胡阳辉
Original assignee: Guangdong Haideya Technology Co ltd
Current assignee: Guangdong Haideya Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-02-01

Abstract

The invention relates to the technical field of camera shooting, in particular to a lens module. The lens module comprises a fixed seat, a driving device, a lens bracket and a lens; the driving device is arranged at one side of the fixed seat, the lens bracket is sleeved in the fixed seat, the lens bracket is provided with a through hole, and the lens is arranged in the through hole; the driving device comprises a magnet assembly and a coil assembly, and the coil assembly and the magnet assembly cooperate to drive the lens support to move along the direction parallel to the optical axis after being electrified. The lens driving device is characterized by further comprising an elastic assembly, the elastic assembly comprises a first elastic sheet and a second elastic sheet, the first elastic sheet is symmetrically arranged on two sides of the driving device, and the first elastic sheet and the second elastic sheet are fixed on the fixing base and the lens support. A driving device is arranged on one side of the fixed seat, a new magnetic field is generated after the coil assembly is electrified, and the electromagnetic force of the new magnetic field and the magnet assembly in a synergistic effect drives the lens bracket to move along the direction parallel to the optical axis. The driving device is miniaturized, the occupied space of the lens module is small, and the reduction of the size of the camera shooting equipment is facilitated.

Description

Lens module

Technical Field

The invention relates to the technical field of camera shooting, in particular to a lens module.

Background

With the rapid development of multimedia technology, digital cameras, video cameras, tablet computers and mobile phones with cameras are more and more favored by consumers, and in the digital cameras, video cameras, mobile phone cameras and other photographic devices, the lens module is an indispensable component. A camera module generally includes a lens barrel, a lens mount, a lens, and an image sensor. The lens is accommodated in the lens barrel, the image sensor is arranged on the lens base, and the motor drives the lens to move for focusing.

The conventional VCM leaf spring type motor is generally a symmetrical 2-side arranged driving unit, or a central symmetrical 4-side arranged driving unit. However, such an arrangement makes the whole lens module have a large volume and a complex structure, and cannot meet the demands of people for the light, thin, short and small camera module. Therefore, there is a need in the market to provide a lens module with low cost, simple structure and small occupied space.

Disclosure of Invention

The invention aims to provide a lens module which is simple in structure, small in occupied space and beneficial to reduction of the volume of camera equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

a lens module comprises a fixed seat, a driving device, a lens bracket and a lens;

the driving device is arranged on one side of the fixed seat, the lens support is sleeved in the fixed seat, a through hole is formed in the lens support, and the lens is arranged in the through hole;

the driving device comprises a magnet assembly and a coil assembly, and the coil assembly and the magnet assembly cooperate to drive the lens support to move along the direction parallel to the optical axis after being electrified.

The elastic component comprises a first elastic sheet and a second elastic sheet which are symmetrically arranged at two sides of the driving device perpendicular to the optical axis direction,

the first elastic sheet and the second elastic sheet are fixed on the fixed seat and the lens support.

Preferably, the first elastic sheet and the second elastic sheet are hollow.

Preferably, at least one damping glue is arranged between the lens support and the fixed seat.

Preferably, a plurality of damping glues are arranged between the lens support and the fixed seat, and the damping glues are symmetrically arranged on two sides of the driving device.

Preferably, the magnet assembly comprises a first magnet and a second magnet, and the coil assembly comprises a first coil;

the first coil is arranged between the first magnet and the second magnet and arranged on the lens support;

the first coil is electrified with current in a forward direction or a reverse direction to form a new magnetic field, and the new magnetic field is attracted or repelled with the first magnet and the second magnet so as to drive the first coil to move.

Preferably, the magnet assembly comprises a third magnet, and the coil assembly comprises a second coil and a third coil;

the third magnet is arranged between the second coil and the third coil, and the third magnet is arranged on the lens support;

the second coil and the third coil are electrified with current in opposite directions.

Preferably, the fixing seat is provided with two magnetic conductive sheets, the first magnet is fixed on one of the magnetic conductive sheets, and the second magnet is fixed on the other magnetic conductive sheet.

Preferably, the fixed seat is provided with two magnetic conductive sheets, the second coil is fixed on one of the magnetic conductive sheets, and the third coil is fixed on the other magnetic conductive sheet.

Preferably, the lens holder is provided with two groove-shaped receiving portions, and both ends of the first coil are mounted in the groove-shaped receiving portions.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

the single side of the fixing seat is provided with a driving device, the driving device comprises a magnet assembly and a coil assembly, a new magnetic field is generated after the coil assembly is electrified, the new magnetic field and the electromagnetic force of the synergistic effect of the magnet assembly drive the lens support to move up and down along the direction parallel to the optical axis, and the lens is installed on the lens support, so that the driving device drives the lens to move, and the lens module realizes the focusing function. The driving device is miniaturized, the lens module is simple in structure, occupies small space, and is beneficial to reduction of the size of the camera equipment. In addition, the arrangement of the driving devices on one side is advantageous to reduce the mutual interference of electromagnetic force between the two driving devices when the two-camera driving device is arranged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic front view of a lens module structure according to an embodiment of the invention;

fig. 2 is a schematic top view of a lens module structure according to an embodiment of the invention;

fig. 3 is an exploded schematic view of a lens module structure according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a second lens module according to an embodiment of the invention.

Illustration of the drawings: the device comprises a fixed seat 1, a driving device 2, a lens bracket 3, a lens 4, an elastic component 5, a magnetic conduction sheet 6 and damping glue 7;

a first magnet 21, a second magnet 22, a first coil 23, a third magnet 24, a second coil 25, and a third coil 26;

the groove-shaped accommodating part 31, the first elastic sheet 51 and the second elastic sheet 52.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below 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.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Example one

Referring to fig. 1 to 3, a lens module includes a fixing base 1, a driving device 2, a lens holder 3 and a lens 4;

the driving device 2 is arranged at one side of the fixed seat 1, the lens bracket 3 is sleeved in the fixed seat 1, the lens bracket 3 is provided with a through hole, and the lens 4 is arranged in the through hole;

the driving device 2 includes a magnet assembly and a coil assembly, and the coil assembly is energized to cooperate with the magnet assembly to drive the lens holder 3 to move in a direction parallel to the optical axis.

Specifically, the single side of the fixing seat 1 is provided with the driving device 2, the driving device 2 comprises a magnet assembly and a coil assembly, a new magnetic field is generated after the coil assembly is electrified, the new magnetic field and the magnet assembly cooperate to drive the lens support 3 to move up and down along the direction parallel to the optical axis, and the lens 4 is installed on the lens support 3, so that the driving device 2 drives the lens 4 to move, and the lens module realizes the focusing function. The driving device 2 is miniaturized, the lens module is simple in structure and small in occupied space, and the reduction of the size of the camera shooting equipment is facilitated. Further, the arrangement of the driving devices 2 on one side is advantageous for reducing the mutual interference of electromagnetic forces between the two driving devices 2 when the two-camera driving devices 2 are arranged.

When the driving device 2 drives the lens holder 3 and the lens 4 on one side, the lens holder 3 and the lens 4 are easily turned over by the force applied on one side. In order to avoid the above situation, in an alternative embodiment, the optical drive device further includes an elastic assembly 5, where the elastic assembly 5 includes a first elastic sheet 51 and a second elastic sheet 52, and the first elastic sheet 51 and the second elastic sheet 52 are symmetrically disposed on two sides of the driving device 2 perpendicular to the optical axis direction;

the first elastic sheet 51 and the second elastic sheet 52 are fixed on the fixing base 1 and the lens holder 3. The fixed seat 1 is fixed in the driving process, and the end parts of the first elastic sheet 51 and the second elastic sheet 52 are fixed on the fixed seat 1, so that the lens support 3 and the lens 4 are kept in a balanced state as much as possible in the moving process, and the side turning of the lens support is avoided. Optionally, the center of the pushing force of the driving device 2 coincides with the center of the first elastic sheet 51 and the center of the second elastic sheet 52.

Optionally, in the present application, the first elastic piece 51 and the second elastic piece 52 are hollow. The materials used by the first elastic sheet 51 and the second elastic sheet 52 are reduced, which is beneficial to saving cost.

At least one damping rubber 7 is arranged between the lens support 3 and the fixed seat 1. The damping glue 7 reduces the resonance amplitude of the lens support 3 and the fixed seat 1, shortens the resonance frequency and improves the stroke precision of the lens support 3.

Be provided with a plurality of damping between lens holder 3 and the fixing base 1 and glue 7, a plurality of damping glue 7 symmetries set up the both sides at drive arrangement 2. In this embodiment, four damping rubbers 7 are disposed between the lens holder 3 and the fixing base 1, and two damping rubbers 7 are disposed on two sides of the driving device 2.

In an alternative embodiment, the magnet assembly comprises a first magnet 21 and a second magnet 22, the coil assembly comprises a first coil 23;

the first coil 23 is arranged between the first magnet 21 and the second magnet 22, and the first coil 23 is arranged on the lens holder 3;

the first coil 23 is energized with a current in a forward direction or a reverse direction to form a new magnetic field, the new magnetic field attracts the first magnet 21 or the second magnet 22, and the new magnetic field repels the second magnet 22 or the first magnet 21.

For example, the S pole of the first magnet 21 is opposite to the first coil 23, when a direct current is applied to the first coil 23, two ends of the first coil 23 will generate magnetic poles, if the end of the first coil 23 facing the first magnet 21 is the N pole, the first magnet 21 will generate attraction force to the first coil 23 according to the physical principle of heteropolar attraction, and at the same time, the S pole of the second magnet 22 is opposite to the first coil 23, and the end of the first coil 23 facing the first magnet 21 is the S pole, and according to the physical principle of homopolar repulsion, the second magnet 22 will generate thrust force to the first coil 23, so that the first coil 23 is driven to move toward the first magnet 21, and the first coil 23 is disposed on the lens holder 3, and therefore, the lens holder 3 also moves toward the first magnet 21.

Furthermore, two magnetic conductive sheets 6 are arranged on the fixing seat 1, the first magnet 21 is fixed on one of the magnetic conductive sheets 6, and the second magnet 22 is fixed on the other magnetic conductive sheet 6. The magnetic conductive sheet 6 is made of magnetic conductive material, the magnetic conductive sheet 6 can be made of amorphous alloy or silicon steel sheet, but the silicon steel sheet generates excessive heat, and the electric utilization rate of the silicon steel sheet is less than one fourth of that of the amorphous alloy. In actual production, glue dispensing can be adopted to fix the two ends of the magnetic conductive sheet 6 on the fixed seat 1.

Alternatively, the lens holder 3 is provided with two groove-shaped receiving portions 31, and both ends of the first coil 23 are mounted in the groove-shaped receiving portions 31.

Example two

The arrangement of the magnet assembly and the coil assembly is not limited to the embodiment as a structure, and referring to fig. 4, the magnet assembly includes a third magnet 24, and the coil assembly includes a second coil 25 and a third coil 26;

the third magnet 24 is disposed between the second coil 25 and the third coil 26, and the third magnet 24 is disposed on the lens holder 3;

the second coil 25 and the third coil 26 are energized with currents in opposite directions.

For example, the N-pole of the third magnet 24 is opposite to the second coil 25, the S-pole of the third magnet 24 is opposite to the third coil 26, if a clockwise direct current is applied to the second coil 25, magnetic poles are generated at both ends of the second coil 25, the S-pole of the second coil 25 is opposite to the N-pole of the third magnet 24, and if a counterclockwise direct current is applied to the third coil 26, the S-pole of the third coil 26 is opposite to the S-pole of the third magnet 24, whereby the third magnet 24 and the lens holder 3 are driven to move toward the second coil 25.

In this embodiment, the third magnet 24 is disposed between the second coil 25 and the third coil 26, the third magnet 24 drives the lens holder 3 to move, the second coil 25 and the third coil 26 are fixed, and the second coil 25 and the third coil 26 are more convenient for connecting a power supply.

Furthermore, two magnetic conductive sheets 6 are arranged on the fixed seat 1, the second coil 25 is fixed on one of the magnetic conductive sheets 6, and the third coil 26 is fixed on the other magnetic conductive sheet 6.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A lens module is characterized by comprising a fixed seat (1), a driving device (2), a lens bracket (3) and a lens (4);

the driving device (2) is arranged on one side of the fixed seat (1), the lens support (3) is sleeved in the fixed seat (1), the lens support (3) is provided with a through hole, and the lens (4) is arranged in the through hole;

the driving device (2) comprises a magnet assembly and a coil assembly, and the coil assembly and the magnet assembly cooperate to drive the lens holder (3) to move along the direction parallel to the optical axis after being electrified.

2. The lens module as claimed in claim 1, further comprising an elastic assembly (5), wherein the elastic assembly comprises a first elastic sheet (51) and a second elastic sheet (52), the first elastic sheet (51) and the second elastic sheet (52) are symmetrically arranged on two sides of the driving device (2) perpendicular to the optical axis direction,

the first elastic sheet (51) and the second elastic sheet (52) are fixed on the fixed seat (1) and the lens support (3).

3. The lens module as claimed in claim 2, wherein the first resilient piece (51) and the second resilient piece (52) are hollow.

4. A lens module according to claim 1, characterized in that at least one damping glue (7) is arranged between the lens holder (3) and the holder (1).

5. The lens module as claimed in claim 4, wherein a plurality of damping rubbers (7) are disposed between the lens holder (3) and the fixing base (1), and the damping rubbers (7) are symmetrically disposed on two sides of the driving device (2).

6. The lens module as claimed in claim 1, wherein the magnet assembly comprises a first magnet (21) and a second magnet (22), and the coil assembly comprises a first coil (23);

the first coil (23) is arranged between the first magnet (21) and the second magnet (22), and the first coil (23) is arranged on the lens holder (3);

the first coil (23) is electrified with current in a forward direction or a reverse direction to form a new magnetic field, and the new magnetic field is attracted or repelled with the first magnet (21) and the second magnet (22) so as to drive the first coil (23) to move.

7. The lens module according to claim 1, wherein the magnet assembly comprises a third magnet (24), the coil assembly comprises a second coil (25) and a third coil (26);

the third magnet (24) is arranged between the second coil (25) and the third coil (26), the third magnet (24) is arranged on the lens holder (3);

the second coil (25) and the third coil (26) are energized with currents in opposite directions.

8. The lens module as claimed in claim 6, wherein the fixing base (1) is provided with two magnetic conductive plates (6), the first magnet (21) is fixed on one of the magnetic conductive plates (6), and the second magnet (22) is fixed on the other magnetic conductive plate (6).

9. The lens module as claimed in claim 7, wherein two magnetic conductive plates (6) are disposed on the fixing base (1), the second coil (25) is fixed on one of the magnetic conductive plates (6), and the third coil (26) is fixed on the other magnetic conductive plate (6).

10. The lens module according to claim 6, wherein the lens holder (3) is formed with two groove-shaped receiving portions (31), and both ends of the first coil (23) are mounted in the groove-shaped receiving portions (31).