CN108227105B

CN108227105B - Lens module

Info

Publication number: CN108227105B
Application number: CN201611200133.9A
Authority: CN
Inventors: 吴富源; 林坤仕; 徐尚榆
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2016-12-22
Filing date: 2016-12-22
Publication date: 2021-07-30
Anticipated expiration: 2036-12-22
Also published as: CN108227105A

Abstract

The present disclosure provides a lens module including an optical lens unit, a carrier and a base. The optical lens unit is arranged in the bearing piece and is provided with an optical axis. The bearing piece is provided with a flange and a bottom surface, wherein the flange protrudes out of the bottom surface along the optical axis direction. The base is connected with the bearing piece and is provided with an upper surface and a protruding part, wherein the protruding part protrudes out of the upper surface towards the direction of the bearing piece. An L-shaped channel or a Z-shaped channel is formed between the convex part and the flange.

Description

Lens module

Technical Field

The present disclosure relates to lens modules, and more particularly to a lens module having a carrier and a base with a staggered structure therebetween.

Background

With the rapid development of communication technology, camera modules have been widely used in portable electronic devices such as mobile phones and tablet computers. In order to improve the quality of the pictures taken by the camera module, the camera module generally has a lens and a photosensitive element, and the driving motor is used to adjust the position of the lens module, so as to achieve the functions of auto focus (auto focus) and/or zoom (zoom).

However, the internal structure of the conventional camera module is difficult to isolate the intrusion of foreign objects, so that dust entering from the outside or generated by the driving motor stays between the lens and the photosensitive element, thereby affecting the image quality.

Disclosure of Invention

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a lens module, which includes an optical lens unit having an optical axis; a bearing piece bearing the optical lens unit and having a flange and a bottom surface, wherein the flange protrudes from the bottom surface along the optical axis direction; and a base connected with the bearing piece and provided with an upper surface and a protruding part, wherein the protruding part protrudes out of the upper surface towards the direction of the bearing piece, and an L-shaped channel or a Z-shaped channel is formed between the protruding part and the flange.

In one embodiment, the distance between the flange and the upper surface of the base is smaller than the distance between the protrusion and the bottom surface of the lens carrier.

In an embodiment, the protruding portion forms a first inclined surface and the flange forms a second inclined surface, wherein the first inclined surface of the protruding portion is parallel to the second inclined surface of the flange, and the first inclined surface faces the second inclined surface.

In an embodiment, a distance between the flange and the optical axis is smaller than a distance between the protrusion and the optical axis.

In an embodiment, a distance between the protrusion and the optical axis is smaller than a distance between the flange and the optical axis.

In an embodiment, the base includes a first protruding portion and a second protruding portion, and the upper surface is located between the first protruding portion and the second protruding portion.

In an embodiment, the supporting member has a first through hole and the base has a second through hole, and the first through hole and the second through hole have circular structures and substantially equal diameters.

In an embodiment, the optical lens unit has a circular structure with a diameter substantially equal to a diameter of the first through hole.

In an embodiment, the lens module further includes a housing, an elastic element, a coil, and a magnetic element, and the housing, the elastic element, the coil, and the magnetic element are connected to the carrier.

In an embodiment, the elastic element has an upper elastic sheet and a lower elastic sheet, and the supporting element is located between the upper elastic sheet and the lower elastic sheet.

Drawings

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

Fig. 1B is a sectional view of the lens module of fig. 1A.

Fig. 1C is a partially enlarged view of the lens module of fig. 1B.

Fig. 2A is a cross-sectional view of a lens module according to an embodiment of the invention.

Fig. 2B is a partially enlarged view of the lens module of fig. 2A.

Fig. 3A is a cross-sectional view of a lens module according to an embodiment of the invention.

Fig. 3B is a partially enlarged view of the lens module of fig. 3A.

[ notation ] to show

Lens module 1

Outer casing 10

Accommodating space 11

Elastic element 20

Upper spring plate 21

Lower spring plate 22

Optical lens unit 30

Carrier 40

First via 401

Bottom surface 41

Flange 42

Second inclined plane 421

Coil 50

Magnetic element 60

Base 70

Second via 701

Upper surface 71

First projecting portion 72

First inclined plane 721

Second projecting portion 73

Optical axis C

Distance h1

Distance h2

Distance L1

Distance L2

Detailed Description

In order to make the objects, features and advantages of the present disclosure more comprehensible, embodiments accompanied with figures are described in detail below. The configuration of the elements in the embodiments is illustrative and not intended to limit the disclosure. And the reference numerals are repeated among the embodiments, and the association between different embodiments is not intended for the sake of simplifying the description. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are directions with reference to the attached drawings only. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.

Referring to fig. 1A, fig. 1A is an exploded view of a lens module 1 according to an embodiment of the invention. The lens module 1 can be applied to a portable electronic device (e.g., a mobile phone, a tablet computer or a notebook computer), a wearable electronic device (e.g., a smart watch) or a vehicular electronic device (e.g., a driving recorder). As shown in fig. 1A, the lens module 1 of the present embodiment mainly includes a housing 10, an upper elastic sheet 21, an optical lens unit 30, a carrier 40, a coil 50, a plurality of magnetic elements 60, a lower elastic sheet 22 and a base 70, wherein the housing 10 is fixed to the base 70 and has a receiving space 11 for receiving other elements, the magnetic elements 60 are located at four corners of the receiving space 11, the carrier 40 has a first through hole 401, and the base 70 has a second through hole 701, wherein the first through hole 401 and the second through hole 701 respectively have a circular structure and have substantially the same diameter, and the optical lens unit 30 also has a circular structure and has a diameter substantially equal to the diameter of the first through hole 401 and the diameter of the second through hole 701.

Next, please refer to fig. 1B and fig. 1C together, in which fig. 1B is a sectional view of the lens module 1 of fig. 1A after assembly, and fig. 1C is a partial enlarged view of the left side of the lens module 1 of fig. 1B. As shown in fig. 1B, the upper elastic sheet 21 and the lower elastic sheet 22 may form an elastic structure for connecting the supporting member 40 to the housing 10 and the base 70, wherein the upper elastic sheet 21 and the lower elastic sheet 22 have a metal material and a hollow structure, and may be formed by mechanical stamping, etching, electrical discharge machining or laser cutting. The optical lens unit 30 is disposed in the first through hole 401 of the supporting member 40, has plastic or glass material, and has an optical axis C parallel to the Z-axis direction; since the supporting member 40 is movably connected to the housing 10 and the base 70 through the upper spring plate 21 and the lower spring plate 22, and the coil 50 is disposed on the outer side thereof, the supporting member 40 and the optical lens unit 30 can be driven to move relative to the base 70 along the direction of the optical axis C by the magnetic force generated between the coil 50 and the magnetic element 60, thereby achieving the purpose of fast focusing.

As shown in fig. 1C, the supporting member 40 supports the optical lens unit 30 and has a bottom surface 41 and a flange 42, wherein the flange 42 protrudes from the bottom surface 41 along the Z-axis direction (parallel to the optical axis C); the base 70 has an upper surface 71, a first protrusion 72 and a second protrusion 73, wherein the first protrusion 72 and the second protrusion 73 protrude from the upper surface 71 toward the supporting member 40, and the upper surface 71 is located between the first protrusion 72 and the second protrusion 73. It should be noted that a zigzag channel is formed between the first protrusion 72 and the flange 42, and a U-shaped channel is formed between the first protrusion 72, the second protrusion 73 and the flange 42 (as shown in fig. 1C), wherein a distance h1 between the flange 42 and the upper surface 71 of the base 70 is smaller than a distance h2 between the first protrusion 72 and the bottom surface 41 of the carrier 40, and a distance L2 between the first protrusion 72 and the optical axis C is smaller than a distance L1 between the flange 42 and the optical axis C (as shown in fig. 1B).

When the lens module 1 is subjected to an external force (e.g., dropped or bumped) to cause the carrier 40 and the base 70 to approach each other, the flange 42 and the upper surface 71 may contact each other, but the first protrusion 72 does not contact the bottom surface 41(h1< h2), so when dust is generated by collision friction between the flange 42 and the upper surface 71, the staggered structure can retain the foreign matter on the upper surface 71 and the zigzag channel, so as to prevent the foreign matter from entering the optically effective area and contaminating the optical lens unit 30 or the photosensitive element (not shown), thereby obtaining a better captured image.

Referring to fig. 2A and 2B, fig. 2A and 2B are a cross-sectional view and a partial enlarged view of a lens module 1 according to another embodiment of the invention, respectively. As shown in fig. 2A and 2B, the lens module 1 of the present embodiment mainly includes a housing 10, an upper elastic sheet 21, an optical lens unit 30, a carrier 40, a coil 50, a lower elastic sheet 22, and a base 70. It should be noted that the main differences between the lens module 1 of the present embodiment and the lens module 1 of the embodiment of fig. 1A-1C are: an L-shaped channel is formed between the first protrusion 72 and the flange 42, and a distance L1 between the flange 42 and the optical axis C is smaller than a distance L2 (as shown in fig. 2A) between the first protrusion 72 and the optical axis C, that is, the flange 42 is closer to the optical axis C than the first protrusion 72, wherein the flange 42 and the base 70 do not overlap in the Z-axis direction.

As can be seen in fig. 2A, the inner surface of the flange 42 directly contacts the optical lens unit 30, and the lower end surface thereof is aligned with the optical lens unit 30, so that the optical lens unit 30 does not contact the base 70, and therefore the length of the optical lens unit 30 along the optical axis C can be increased, and the arrangement of the lenses can be varied. The dual retaining wall structure formed by the flange 42 and the first protrusion 72 can also retain the foreign objects on the upper surface 71 and in the L-shaped channel, and since the length of the optical lens unit 30 can be designed to be longer in this embodiment, the overall performance of the lens module 1 can be greatly improved.

Referring to fig. 3A and 3B, fig. 3A and 3B are a cross-sectional view and a partial enlarged view of a lens module 1 according to another embodiment of the invention, respectively. As shown in fig. 3A and 3B, the lens module 1 of the present embodiment mainly includes a housing 10, an upper elastic sheet 21, an optical lens unit 30, a carrier 40, a coil 50, a lower elastic sheet 22, and a base 70. It should be noted that the main difference between the lens module 1 of the present embodiment and the lens module 1 of the embodiment of fig. 1A to 1C is that: the first protrusion 72 forms a first inclined surface 721, and the flange 42 forms a second inclined surface 421 (as shown in fig. 3B), wherein the first inclined surface 721 of the first protrusion 72 is substantially parallel to the second inclined surface 421 of the flange 42, and the first inclined surface 721 faces the second inclined surface 421.

It should be understood that the supporting member 40 and the base 70 are usually made of plastic by injection molding, however, the plastic needs to have a certain minimum thickness during the molding process, so that the width of the first protrusion 72 and the flange 42 cannot be effectively reduced, and the width of the lens module 1 is difficult to be reduced, which is not favorable for miniaturization. In the present embodiment, the first and second

inclined surfaces

721, 421 are respectively formed on the first protrusion 72 and the flange 42, so that the width of the lens module 1 can be greatly reduced and plastic molding is facilitated. The inclined plane structure of the flange 42 and the first protrusion 72 not only can greatly shorten the width of the lens module 1, so that the overall size of the lens module 1 is more miniaturized, but also the dual retaining wall formed by the first protrusion 72 and the flange 42 can retain foreign matters on the upper surface 71 and in the zigzag channel, so that a better photographed image can be obtained.

In summary, the present invention provides a lens module, including an optical lens unit, a carrier and a base, wherein the optical lens unit is disposed in the carrier and has an optical axis, the carrier has a flange and a bottom surface, the flange protrudes from the bottom surface along the optical axis, the base is connected to the carrier and has an upper surface and a protrusion, the protrusion protrudes from the upper surface toward the carrier, and an L-shaped channel or a zigzag channel is formed between the protrusion and the flange, so that a foreign object entering the lens module can be retained in the zigzag structure, and the influence of the foreign object entering between the optical lens unit and the photosensitive element on the image quality can be effectively avoided.

Although embodiments of the present disclosure and their advantages have been disclosed above, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the disclosure. Moreover, the scope of the present disclosure is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but rather, the process, machine, manufacture, composition of matter, means, methods and steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein. Accordingly, the scope of the present disclosure includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described above. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present disclosure also includes combinations of the respective claims and embodiments.

Claims

1. A lens module, comprising:

an optical lens unit having an optical axis;

a bearing piece bearing the optical lens unit and having a flange and a bottom surface, wherein the flange protrudes from the bottom surface along the optical axis direction;

a base movably connected to the bearing member and having an upper surface, a first protrusion and a second protrusion, wherein the first protrusion protrudes from the upper surface toward the bearing member, an L-shaped channel or a Z-shaped channel is formed between the first protrusion and the flange, the upper surface is located between the first protrusion and the second protrusion, and the first protrusion and the second protrusion are located on the same side of the optical axis; and

and the driving component comprises a magnetic component and a coil, wherein the magnetic component and the coil generate a magnetic force to drive the bearing piece and the optical lens unit to move relative to the base.

2. The lens module as claimed in claim 1, wherein a distance between the flange and the upper surface of the base is smaller than a distance between the first protrusion and the bottom surface of the carrier.

3. The lens module as claimed in claim 1, wherein the first protrusion forms a first slope and the flange forms a second slope, wherein the first slope faces the second slope.

4. The lens module as claimed in claim 1, wherein the first protrusion forms a first slope and the flange forms a second slope, wherein the first slope is parallel to the second slope.

5. The lens module as claimed in claim 1, wherein a distance between the first protrusion and the optical axis is smaller than a distance between the flange and the optical axis.

6. The lens module as claimed in claim 1, wherein a distance between the flange and the optical axis is smaller than a distance between the first protrusion and the optical axis.

7. The lens module as claimed in claim 6, wherein the flange and the base do not overlap in the optical axis direction.

8. The lens module as claimed in claim 6, wherein the flange contacts the optical lens unit.

9. The lens module as claimed in claim 1, wherein the lens module further has a housing, an upper spring and a lower spring, wherein the housing is fixed to the base, the upper spring is connected to the housing and the supporting member, and the lower spring is connected to the supporting member and the base.