CN111796388A

CN111796388A - Waterproof and dustproof method for camera module

Info

Publication number: CN111796388A
Application number: CN201910281105.1A
Authority: CN
Inventors: 杨伟成; 赵立新
Original assignee: Geke Microelectronics Shanghai Co Ltd
Current assignee: Geke Microelectronics Shanghai Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2020-10-20
Anticipated expiration: 2039-04-09
Also published as: CN111796388B

Abstract

The invention designs a waterproof and dustproof method of a camera module, wherein a flexible connecting structure is arranged at the bottom of the camera module and is positioned between the lower part of a lens cone module and an image sensor chip and a substrate, and a cavity is formed between the lens cone module and the image sensor chip and the substrate; when the lens cone module moves, the soft connection structure moves along with the lens cone module, and prevents foreign matters affecting the imaging performance of the module from entering the cavity, wherein the foreign matters comprise: water, oil, dust.

Description

Waterproof and dustproof method for camera module

Technical Field

The invention relates to the technical field of camera modules, in particular to a waterproof and dustproof method of a camera module.

Background

At present, most mobile equipment such as mobile phones and tablet computers carry camera modules, the conversion between optical signals and electric signals is realized through the camera modules, and image information is recorded and stored, so that the photographing and photographing functions are realized. Compared with the conventional Camera system, a Cell phone Camera Module (CCM) is widely used in various new-generation portable Camera devices due to its advantages of miniaturization, low power consumption, low cost, high image quality, and the like.

At present, the structure of the camera module includes a lens unit, a Voice Coil Motor (VCM), an infrared cut-off filter, an image sensor chip, a Flexible Printed Circuit Board (FPC) or a Printed Circuit Board (PCB), and a connector connected to a main Board of the mobile phone. The voice coil motor is used for achieving the automatic focusing function of the lens unit, the voice coil motor usually comprises a magnet, a coil and other structures, in the working process of the camera module, current is firstly supplied to the coil, a magnetic field is generated after the current is supplied to the coil, the magnetic field generated in the coil and the magnetic field generated by the magnet interact to generate electromagnetic force, the coil or the magnet moves under the action of the electromagnetic force, so that the lens unit connected with the voice coil motor is driven to move, the image distance and the object distance of the camera module are adjusted, and clear images are presented. Usually, a Hall Sensor (Hall-effect Sensor) may be further disposed in the voice coil motor, and the Hall Sensor is utilized to measure the change of the magnetic field in the voice coil motor, and the position of the coil or the magnet is determined according to the change of the magnetic field, thereby implementing the closed-loop control of the voice coil motor.

In the camera module course of operation, work as promptly when the camera lens unit is flexible, because the external atmospheric pressure of camera module and the unbalance of inside atmospheric pressure, the cavity that the outside air can pass through the clearance business turn over between each part of camera module by the camera lens unit, the image sensor chip constitutes, makes the inside cavity pollution image sensor chip that the dust granule in the outside air got into the camera module from this, it is bad such as black spot to form black group in camera imaging region, and then influences imaging quality and camera module performance.

At present, a common solution in the industry is to add a dustproof structure to the camera module part design as much as possible, for example, to add a dustproof groove in a motor of a camera, and to ensure the dustproof level of the camera module production line environment and the mobile device assembly production line environment. The dustproof structure is complex, the dustproof effect is poor, and the problem cannot be well solved.

Disclosure of Invention

The invention aims to provide a method for realizing optical anti-shake of a camera module, which improves the imaging quality of the camera module.

In order to solve the technical problems, the invention provides a waterproof and dustproof method for a camera module, wherein a flexible connecting structure is arranged at the bottom of the camera module and is positioned between the lower part of a lens cone module and an image sensor chip and a substrate, and a cavity is formed between the lens cone module and the image sensor chip and the substrate;

when the lens cone module moves, the soft connection structure moves along with the lens cone module, and prevents foreign matters affecting the imaging performance of the module from entering the cavity, wherein the foreign matters comprise: water, oil, dust.

Optionally, an inner opening of the flexible connection structure is connected to the lens barrel module by using an annular structure, and an outer opening of the flexible connection structure is connected to the substrate.

Optionally, the bottom of the lens barrel module has a groove for connecting the inner opening of the flexible connection structure to the lens barrel module.

Optionally, the flexible connection structure is a flexible material structure, and can deform along with the movement of the lens barrel module, and the deformation applies an additional acting force to the lens barrel module that is less than 50% of the pushing force for pushing the lens barrel module to move.

Optionally, the soft connecting structure is a hydrophobic air-permeable filter screen structure, and when the lens barrel module moves, air enters the cavity through the hydrophobic air-permeable filter screen structure, so that the air pressure inside and outside the cavity is balanced.

Optionally, the flexible connection structure includes a folding point located in the middle, and a moving point contacting the bottom of the lens barrel module, and after the lens barrel module is extended out, the moving point is higher than the folding point; after the lens cone module retracts, the moving point is lower than the folding point.

Compared with the prior art, the waterproof and dustproof method for the camera module has the following beneficial effects that:

according to the invention, a flexible connecting structure is arranged at the bottom of a camera module, the flexible connecting structure is positioned between the lower part of a lens cone module and an image sensor chip and a substrate, and a cavity is formed between the lens cone module and the image sensor chip and the substrate; when the lens cone module moves, the soft connection structure moves along with the lens cone module, and prevents foreign matters affecting the imaging performance of the module from entering the cavity, wherein the foreign matters comprise: water, oil, dust.

Drawings

Fig. 1 is a cross-sectional view of a camera module according to an embodiment of the invention;

FIG. 2 is a schematic view of a flexible connection structure when the lens barrel module retracts according to an embodiment of the present invention;

fig. 3 is a schematic view of a flexible connection structure when the lens barrel module extends out according to an embodiment of the invention.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.

Next, the present invention is described in detail by using schematic diagrams, and when the embodiments of the present invention are described in detail, the schematic diagrams are only examples for convenience of description, and the scope of the present invention should not be limited herein.

In order to solve the problems in the background art, the bottom of the camera module is provided with a flexible connecting structure, the flexible connecting structure is positioned between the lower part of the lens cone module and the image sensor chip and the substrate, and a cavity is formed between the lens cone module and the image sensor chip and the substrate; when the lens cone module moves, the soft connection structure moves along with the lens cone module, and prevents foreign matters affecting the imaging performance of the module from entering the cavity, wherein the foreign matters comprise: water, oil, dust.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, a detailed description of a waterproof and dustproof method for a camera module according to the present invention is provided below with reference to the accompanying drawings.

Referring to fig. 1, the camera module of the present invention includes: upper structure 10, lens barrel module 50, coil 40, module housing 21, and magnetic member 22. In the waterproof and dustproof method of the camera module, the flexible connecting structure 33 is arranged at the bottom of the camera module, the flexible connecting structure 33 is positioned between the lower part of the lens barrel module 50 and an image sensor chip (not shown in the figure) and the substrate 31, the substrate 31 is arranged at the bottom of the module, and the image sensor chip is arranged above the substrate 31 and below the lens barrel module 50. Soft connection structure 33 is connected with lens barrel module 50, base plate 31 respectively, forms the cavity between lens barrel module 50 and image sensor chip, base plate 31, and when lens barrel module 50 carried out concertina movement, soft connection structure companion 33 moved along with lens barrel module 50, prevented that the external foreign matter that influences the module imaging performance from getting into the cavity, the foreign matter includes: water, oil, dust prevent that the image sensor chip in the cavity from receiving the foreign matter pollution, improve the imaging quality of image sensor chip, improve the module performance.

In the invention, the annular structural member is adopted to assemble the flexible connecting structure, the inner opening of the flexible connecting structure is connected to the lens cone module, and the outer opening of the flexible connecting structure is connected to the substrate.

Specifically, as shown in fig. 2 and fig. 3, the edge of the substrate 31 has a side wall 311, and the outer opening of the flexible connecting structure 33 is connected to the surface of the substrate 31 and covers the side wall 311, so as to prevent the flexible connecting structure 33 from being folded and adhered together during the movement process. The bottom of the lens barrel module 50 has a groove 51 for connecting the inner opening of the flexible connecting structure 33 to the lens barrel module 50. In this embodiment, the inner opening of the flexible connecting structure 33 is fixedly connected to the annular structural member 32, the annular structural member 32 is a rigid structure with a central circular hole, one end of the annular structural member 32 is connected to the groove 51 at the bottom of the lens barrel module 50, and the other end of the annular structural member is connected to the inner opening of the flexible connecting structure 33. In addition, the inner opening of the flexible connecting structure 33 may also cover the inner side surface of the annular structural member 32 until being connected to the groove 51 at the bottom of the lens barrel module 50, and the flexible connecting structure 33 is fixed, that is, the inner opening of the flexible connecting structure 33 is connected to the groove 51 at the bottom of the lens barrel module 50, so that the flexible connecting structure 33 is connected more stably. The flexible connecting structure 33, the substrate 31 and the annular structural member 32 may be connected by compression, adhesion, or the like, which is not limited in the present invention.

In an embodiment, the flexible connecting structure 33 is a flexible material structure, and can deform along with the movement of the lens barrel module 50, and the deformation applies an additional acting force to the lens barrel module 50 that is less than 50% of the pushing force for pushing the lens barrel module 50 to move, so that the focusing movement of the lens barrel module is not affected.

Further, the flexible connecting structure 33 is a hydrophobic air-permeable filter structure, and when the lens barrel module 50 moves, air enters the cavity through the hydrophobic air-permeable filter structure, so as to balance the air pressure inside and outside the cavity, thereby avoiding the influence on the movement of the lens barrel module due to the imbalance of the internal and external pressures.

Referring again to fig. 2 and 3, the flexible connecting structure 33 includes a folding point 331 at the middle portion and a moving point 332 contacting the bottom of the lens barrel module 50 (or the bottom of the ring structure 32). During the movement of lens barrel module 50, base plate 31 is fixed, and annular structure 32 moves along with lens barrel module 50, so that folding point 331 does not move along with lens barrel module 50, and moving point 332 moves along with lens barrel module 50. After the lens barrel module 50 is retracted, the moving point 332 is lower than the folding point 331 as shown in fig. 2, and after the lens barrel module 50 is extended, the moving point 332 is higher than the folding point 331 as shown in fig. 3.

In summary, in the present invention, a flexible connecting structure is disposed at the bottom of the camera module, and the flexible connecting structure is located between the lower portion of the lens barrel module and the image sensor chip and the substrate, so as to form a cavity between the lens barrel module and the image sensor chip and the substrate; when the lens cone module moves, the soft connection structure moves along with the lens cone module, and prevents foreign matters affecting the imaging performance of the module from entering the cavity, wherein the foreign matters comprise: water, oil, dust.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims

1. A waterproof and dustproof method of a camera module is characterized in that a flexible connecting structure is arranged at the bottom of the camera module and is positioned between the lower part of a lens cone module and an image sensor chip and a substrate, and a cavity is formed between the lens cone module and the image sensor chip and the substrate;

2. The waterproof and dustproof method for a camera module according to claim 1, wherein an inner opening of the flexible connecting structure is connected to the lens barrel module by using an annular structural member, and an outer opening of the flexible connecting structure is connected to the substrate.

3. The waterproof and dustproof method for a camera module according to claim 2, wherein the bottom of the lens barrel module has a groove for connecting the inner opening of the flexible connecting structure to the lens barrel module.

4. The waterproof and dustproof method for a camera module according to claim 1, wherein the flexible connection structure is a flexible material structure and can deform along with the movement of the lens barrel module, and the deformation applies an additional acting force to the lens barrel module that is less than 50% of the pushing force for pushing the lens barrel module to move.

5. The waterproof and dustproof method for camera module according to claim 1, wherein the flexible connection structure is a hydrophobic air-permeable screen structure, and when the lens barrel module moves, air enters the cavity through the hydrophobic air-permeable screen structure to balance the air pressure inside and outside the cavity.

6. The waterproof and dustproof method for the camera module according to claim 1, wherein the flexible connecting structure comprises a folding point located in the middle and a moving point contacting the bottom of the lens barrel module, and after the lens barrel module is extended, the moving point is higher than the folding point; after the lens cone module retracts, the moving point is lower than the folding point.