KR100661612B1 - Camera module - Google Patents

Abstract

A camera module is provided to eliminate a badness factor by an impurity and to improve the image quality of the camera module by preventing the inflow of the impurity such as particles generated during a focusing process performed as soon as a lens barrel and a housing are engaged when the camera module is manufactured. One or more lenses are mounted in a lens barrel(6), and a cylindrical body is extended to a lower part of the lens barrel(6). A barrel to which the cylindrical body of the lens barrel(6) is combined is extended to an upper part of a housing(3). A PCB(1) closely adheres to a lower end part of the housing(3). An image sensor is attached to a central part of the PCB(1). An inflow preventing implement(20) is inserted between a lower surface of the cylindrical body of the lens barrel(6) and an inner circumference surface of the housing(3).

Description

Camera Module {CAMERA MODULE}

1 is a cross-sectional view schematically showing a conventional camera module

Figure 2 is a cross-sectional view showing the cause of the defect caused by foreign matter in the conventional camera module.

3 is an assembled perspective view of a first embodiment of a camera module according to the present invention;

4 is a sectional view of a first embodiment of a camera module according to the present invention;

5 is a sectional view of a second embodiment of a camera module according to the present invention;

<Explanation of symbols for the main parts of the drawings>

1. PCB Board 2. Image Sensor

3. Housing 6. Lens Barrel

8. IR filter 9. Seating wheel

10. Camera Module 20. Inflow Guard

31a. Protrusion ring insertion groove 32. Protrusion ring

The present invention relates to a structure that prevents the inflow of foreign matter into the module during the focusing process of the camera module, and more specifically, foreign matter such as particles generated during the focusing process performed at the same time as the screw barrel and the screw coupling of the housing when the camera module is manufactured. By preventing the inflow, it relates to a foreign matter inflow prevention structure of the camera module to remove the defects caused by the foreign matter to improve the image quality of the camera module.

In general, the camera module (CCM: COMPACT CAMERA MOUDULE) is compact and is applied to various IT devices such as a camera phone, a PDA, a smartphone, and a portable mobile communication device such as a toy camera (TOY CAMERA). Increasingly, devices equipped with small camera modules are gradually being released to meet various consumer tastes.

Such a camera module is manufactured using an image sensor such as a CCD or a CMOS as a main component, and collects an image of an object through the image sensor and stores it as data in a memory in the device, and the stored data is stored in the LCD or PC in the device. The image is displayed through a display medium such as a monitor.

1 is a cross-sectional view schematically showing a conventional camera module. In the conventional camera module 10, a printed circuit board 1 having a CCD or CMOS image sensor 2 mounted by a wire bonding method or a flip chip method may be formed of plastic. The lens barrel 6 is coupled to the lower portion of the housing 3 of the material and the cylindrical barrel 5 extending downward to the barrel 4 extending above the housing 3.

The camera module 10 is a screw combination of the female threaded portion 4a formed on the inner circumferential surface of the barrel 4 and the male threaded portion 5a formed on the outer circumferential surface of the cylindrical body 5 so that the housing 3 and the lens barrel 6 mutually interact with each other. Combined.

In this case, an infrared cut-off filter (IR) is formed between an upper surface of the printed board 1, that is, a lens L mounted on the lower end of the lens barrel 6 and an image sensor 2 attached to the lower surface of the printed board 1. CUT-OFF FILTER (hereinafter referred to as 'IR filter') 8 is combined to block infrared rays of excessive long wavelength flowing into the image sensor 2.

In the camera module assembled as described above, light flowing from a specific object passes through the lens L, and the image is inverted to focus on the surface of the image sensor 2, where the screw is coupled to the upper end of the housing 3. While rotating the lens barrel 6, the adhesive is injected between the clearance between the housing 3 and the lens barrel 6 at the point where the optimal focus is achieved, and the housing 3 and the lens barrel 6 are adhesively fixed to the final camera. Modular products are produced.

On the other hand, in recent years, as the resolution or number of pixels required by consumers increases, the emphasis has been placed on whether to manage foreign materials in the camera module or in the manufacturing process of the camera module. As a result, the problem is that there is a limit to the supply and demand management of materials that finally raise the unit price of the product and practically no foreign matters.

Therefore, in order to minimize the increase in product cost, the materials and parts that are generally widely used are still used. Problems generated during the inspection process, such as an image inspection due to a failure cause when assembling the camera module, are as follows.

As shown in FIG. 2, the conventional camera module having the above-described structure includes a female screw portion 4a provided on the inner circumferential surface of the barrel 4 of the housing 3 in the final focusing adjustment step after assembling the module. As the engagement portion is worn by the friction of the male screw portion 5a provided on the outer peripheral surface of the cylindrical body 5 of the lens barrel 6, fine particles P are generated.

As such, the particles P generated between the housing 3 and the lens barrel 6 are mounted on a flat seating ring 9 extending into the housing 3 so that the particles P are infrared cut filter 8. Although falling directly to the upper surface is prevented, free space is provided within the upper and lower conveyance range of the lens (L) to the upper portion of the seating ring (9) and the housing (3) shakes left and right during focus adjustment. As a result, particles P generated at the coupling portion of the housing 3 and the lens barrel 6 must flow into the upper surface of the IR filter 8, and thus act as a defect in reproducing an image through the image sensor 2. The problem is being pointed out.

Accordingly, the present invention was devised to solve the above-mentioned disadvantages and problems in the conventional camera module assembly process, and the foreign material defect rate caused by particles introduced in the focusing process during the manufacturing process of the camera module is introduced into the housing. It is an object of the present invention to provide a structure of a camera module so that it can be.

The object of the present invention is a multi-stage at least one lens inside the housing is coupled to the PCB substrate mounted with the image sensor and the IR filter is built into the upper portion of the PCB substrate, the cylindrical body is inserted through the upper opening of the housing. In the camera module manufactured by mutual coupling of the mounted lens barrel, an inflow prevention opening of an elastic material is inserted between the housing bottom and the lens barrel by the camera module.

The housing has a barrel having an insertion hole extending upward, and a female screw portion is formed on the inner circumferential surface of the barrel, and the lens barrel has a male barrel formed on the outer circumferential surface of the cylindrical body extending downward, so that the lens barrel is inserted into the barrel of the housing. The cylindrical bodies are assembled in close contact with each other by screwing.

In addition, the housing has a seating ring extending inwardly at a lower end of the inner circumferential surface thereof, and an IR filter is mounted at a lower side thereof. It is coupled to be in close contact with the upper surface of the inlet.

At this time, the inlet is mounted on the flow path of the particles generated by the friction of the female and male threads during assembly of the housing and the lens barrel.

The camera module of the present invention, which is assembled in such a structure, is formed by the O-ring-type inlet prevention mechanism that is press-bonded between the seating wheel of the housing and the lower periphery of the cylindrical body. The technical feature is that particles are prevented from entering the upper surface of the image sensor and the IR filter.

In addition, the present invention is a PCB substrate with an image sensor is coupled to the housing and the IR filter is built into the upper portion of the PCB substrate, at least one or more lenses are mounted in a multi-stage inside the cylindrical body inserted through the upper opening of the housing. In the camera module manufactured by the mutual coupling of the lens barrel, the insertion hole extending into the housing and the protrusion ring extending below the body of the lens barrel is achieved by the foreign matter inflow prevention structure of the camera module is cross-coupled.

The housing has an insertion hole with a protruding wheel insertion groove formed on the lower inner circumferential surface thereof, and an IR filter is mounted below the protruding wheel insertion groove. Tightly coupled.

In this case, the insertion hole and the protruding wheel are respectively extended to the opposite surface of the housing bottom and the lens barrel, and is located on the flow path of the particles generated by the friction of the female and male threads during assembly of the housing and the lens barrel.

Matters relating to the operational effects including the technical configuration of the object for preventing foreign matter inflow of the camera module of the present invention will be clearly understood by the following detailed description with reference to the drawings in which preferred embodiments of the present invention are shown.

The same reference numerals are given to the following embodiments according to the present invention and the same technical configuration of the prior art.

Example 1

First, Figure 3 is a perspective view of the assembly of the first embodiment of the camera module according to the present invention, Figure 4 is a cross-sectional view of the first embodiment of the camera module according to the present invention.

As shown, this embodiment is coupled to the cylindrical body 5 of the lens barrel 6 in which the plurality of lenses L are incorporated through the upper opening of the barrel 4 extending upwards of the housing 3. At this time, the camera module 10 is assembled between the inner bottom surface of the housing 3 and the lens barrel 6 in a state in which the inflow prevention opening 20 of the elastic material is inserted.

The housing 3 is coupled to the PCB substrate (1) equipped with an image sensor (2) such as CCD or CMOS at the bottom and the IR filter (8) is built in the upper PCB substrate 1 of the inner bottom, the housing To the upper portion of (3), a cylindrical barrel 4 provided with a male screw portion 4a on the outer circumferential surface thereof is extended.

In addition, the housing 3 has a seating wheel 9 protrudingly formed along the lower inner circumferential surface of the barrel 4, and an IR filter 8 is inserted into the lower side of the seating wheel 9, thereby providing the IR filter 8. To be positioned on the upper surface of the PCB substrate 1 on which the image sensor 2 is mounted.

On the seating ring 9 formed below the inner circumferential surface of the housing 3, an inflow prevention hole 20 contacting the lower periphery of the lens barrel 6 is inserted such that its outer circumferential surface is in contact with the inner circumferential surface of the housing 3. In addition, the cylindrical body 5 of the lens barrel 6 is vertically coupled through the upper opening of the barrel 4 after the insertion of the inflow prevention port 20.

Therefore, the inflow prevention port 20 is the outer peripheral surface in the inner barrel of the housing 3 is in close contact with the inner peripheral surface of the barrel 4, the upper peripheral edge of the cylindrical body 5 of the lens barrel 6 is pressed into the upper surface, the It is divided and separated into the side space of the housing (3) and the bottom space of the housing (3) corresponding to the diameter of the lens (L) mounted on the cylindrical body (5) by the inflow prevention port (20).

That is, the inflow prevention part 20 serves as a separating partition wall that separates the inner space portion from the side wall to which the cylindrical body 5 of the barrel 4 and the lens barrel 6 are coupled, and thus the barrel 4. The female threaded portion 4a and the male threaded portion 5a of the cylindrical body 5 are screwed together to prevent foreign substances generated from the friction contact surface from flowing into the inner space where the IR filter 8 and the image sensor 2 are located. It will play a role.

In addition, the inflow prevention port 20 is made of a synthetic resin material with elastic restoring force such as sponge, rubber, etc., the inner circumferential surface diameter of the lens barrel 6 is slightly smaller than the outer peripheral diameter of the lower end of the cylindrical body (5) It is preferable to form the same.

On the other hand, the inflow prevention port 20 is to be selected as a material with elastic restoring force, the cylindrical body 5 of the lens barrel 6 by rotating the left and right inside the barrel 4, the vertical movement This is to allow the separation partition wall between the inner space and the sidewall to be formed regardless of the height change of the lens L at the lowermost level due to the property of the material provided with the elastic restoring force.

At this time, the inflow prevention port 20 is preferably configured in the form of an O-ring (O-ring) of the same shape as the lower peripheral portion of the barrel 4 of the seating ring (9) of the housing (3).

As such, the camera module 10 of the present embodiment is compressed between the seating ring 9 extending into the bottom surface of the housing 3 and the lower periphery of the cylindrical body 5 of the lens barrel 6. A ring-shaped inflow prevention port 20 forms a separation partition that separates the inner space portion from the coupling portion of the housing 3 and the lens barrel 6, so that the foreign matter generated by frictional contact in the focusing process of the camera module. There is a technical feature to prevent the inflow to the upper surface of the IR filter (8).

Example 2

Next, FIG. 5 is a cross-sectional view of a second embodiment of the camera module according to the present invention. As shown, this embodiment shows a plurality of lenses L through the top opening of the barrel 4 extending to the top of the housing 3. When the cylindrical body 5 of the lens barrel 6 with built-in is coupled, the cylindrical shape of the lens barrel 6 is inserted into the protruding wheel insertion groove 31a formed in the seating wheel 31 inside the bottom of the housing 3. It consists of a camera module 10 that is assembled to be inserted into the protruding ring 32 extending to the lower portion of the body (5).

The housing 3 is a seating wheel provided with a protruding wheel inserting groove 31a on its upper surface on the lower inner circumferential surface of the barrel 4, like the seating ring 9 on the inner circumferential surface of the barrel 4 of the first embodiment described above. 31 is formed. In addition, on the lower end of the body of the lens barrel 6 at a position corresponding to the protruding wheel insertion groove 31a, the protruding wheel 32 extends downward along its outer periphery.

When the cylindrical body 5 of the lens barrel 6 is vertically coupled through the barrel 4 of the housing 3, the protrusion wheel 32 of the lower end of the cylindrical body 5 extends into the housing 3. By being closely coupled to the protruding ring insertion groove 31a of the 31, the bottom space portion of the housing 3 corresponding to the side of the housing 3 and the diameter of the lens L mounted on the cylindrical body 4 is distinguished. A partition is formed.

Therefore, in the present embodiment, fine foreign matters generated by frictional contact of each wall part during the focusing process by screwing the housing 3 and the lens barrel 6 and adjusting the height of the lens L of the lens barrel 6 are removed. Due to the partition wall formed by the combination of the seating wheel 31 and the protruding wheel 32, there is a technical feature to prevent the entry of the IR filter 8 on the bottom of the housing 3 or the inside of the camera module.

On the other hand, in the present embodiment, the position of the protruding wheel insertion groove 31a formed on the upper surface of the seating wheel 31 and the protruding wheel 32 formed on the lower end of the body of the lens barrel 6 may be formed opposite to each other. That is, a protrusion wheel is formed on an upper surface of the seating wheel 31 and a protrusion ring insertion groove is formed at the lower end of the body of the lens barrel 6 to insert the protrusion wheel into the lower portion of the lens barrel on the seating wheel of the housing. The elongated cylindrical bodies form an uneven bond with each other.

The present invention is not limited to the above-described technical configuration, but may be structurally various modifications and changes by those skilled in the art, which should be considered to be included in the spirit and scope of the present invention as defined in the appended claims. something to do.

As described above, the camera module of the present invention has a top surface of the IR filter and the image sensor on the bottom surface of the housing through the sidewalls of the fine foreign substances generated during the focusing process by adjusting the lens height at the same time as the lens barrel and the screw coupling of the housing when the camera module is manufactured. Since it is prevented from being introduced into, it is possible to significantly reduce the defective rate of the camera module due to foreign matters, as well as the effect of improving the image quality of the manufactured camera module can be expected.

Claims (10)

A lens barrel having one or more lenses mounted thereon and having a cylindrical body extending thereunder; A housing in which a barrel into which the cylindrical body of the lens barrel is coupled extends upward; A substrate tightly coupled to the lower end of the housing and having an image sensor attached to the center; And And an inflow prevention device interposed between the cylindrical body bottom of the lens barrel and the inner circumferential surface of the housing. The method of claim 1, The housing, the camera module, characterized in that the seating ring protrudes into the lower end of the barrel. The method of claim 1, The inflow prevention port, the camera module, characterized in that installed so as to be located inside the position of the interface between the cylindrical body of the lens barrel and the barrel of the housing. The method of claim 1, The inflow preventing device is in contact with any one surface of the cylindrical body bottom surface of the lens barrel and the seating ring upper surface of the housing. The method of claim 1, The inflow prevention port, the camera module, characterized in that formed in the O-ring (O-ring) form. The method of claim 5, The outer diameter of the inlet port, the camera module, characterized in that formed to be smaller than or the same as the outer peripheral diameter of the lower end of the cylindrical body of the lens barrel. The method of claim 1, The inflow prevention port, the camera module, characterized in that made of a synthetic resin material with elastic restoring force. A lens barrel having one or more lenses mounted thereon and having a cylindrical body extending thereunder; A housing including a barrel having the cylindrical body of the lens barrel inserted into and coupled from an upper portion thereof, and a seating ring protruded into the lower end of the barrel; And a substrate coupled to a lower portion of the housing and having an image sensor attached thereto. Camera module, characterized in that when the housing and the lens barrel is coupled, the seating wheel of the housing and the cylindrical body of the lens barrel is unevenly coupled to each other. The method of claim 8, Concave-convex coupling between the seating wheel of the housing and the cylindrical body of the lens barrel, the camera module, characterized in that made by a protrusion ring formed in the seating wheel of the housing and a protrusion ring insertion groove formed in the cylindrical body of the lens barrel. The method of claim 8, Concave-convex coupling between the seating wheel of the housing and the cylindrical body of the lens barrel, the camera module, characterized in that made by the protrusion ring insertion groove formed in the seating wheel of the housing and the protrusion wheel formed in the cylindrical body of the lens barrel.

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