KR20130047344A - Camera module - Google Patents

Abstract

PURPOSE: A camera module is provided to enable absorbing of loads which are repetitively applied to wire springs by including a shock-absorbing unit, thereby firmly fixing the camera module to a connection unit of PCBs(Printed Circuit Board). CONSTITUTION: A camera module comprises a first PCB(Printed Circuit Board)(10), a housing unit(20), a holder module(30), a second PCB(40), a third PCB(50), a plurality of wire springs(60), and a shock-absorbing unit(100). An image sensor is mounted on the first PCB. The housing unit is arranged in the upper part of the first PCB. The holder module is arranged by being separated from the inner bottom surface of the housing unit at a predetermined interval. A first coil is reeled in the outer periphery of the holder module, and the holder module includes at least one lens in the inside. The second PCB is joined to the bottom surface of the holder module. One end of the wire spring is connected to the second PCB, and the other end of the wire spring is connected to the third PCB. The shock-absorbing unit is formed in a connected portion of the wire springs and the third PCB to be integrated with the wire springs.

Description

Camera module {Camera Module}

The present invention relates to a camera module.

In the case of a camera module mounted in a small electronic product, the camera module may be frequently shocked during use, and the camera module may be minutely shaken due to the shaking of the user during shooting. In view of such a point, the camera module which has the shake prevention means in recent years is disclosed.

For example, in Korean Patent Registration No. 10-0741823 (registered on July 16, 2007), a gyro sensor IC or an angular velocity sensor is installed inside a device in which a camera module such as a mobile phone is mounted to correct a hand shake phenomenon. How to do is introduced.

However, if a separate angular velocity detection sensor is provided in this way, a separate detection sensor must be provided to implement a hand shake prevention function, causing an increase in manufacturing cost, and for configuring and installing a hand shake prevention device separately from a camera module. There is a hassle to make room.

Korean Patent No. 10-0741823 (July 16, 2007)

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera module having an optical image stabilizer function.

A camera module according to the present invention includes a first printed circuit board on which an image sensor is mounted; A housing unit disposed on the first printed circuit board; A holder module disposed at a distance from the bottom surface of the housing unit, the holder module including a first coil wound around an outer circumferential surface thereof and including at least one lens therein; A second printed circuit board coupled to the bottom surface of the holder module; A third printed circuit board installed above the holder module; A plurality of wire springs having one end connected to the second printed circuit board and the other end connected to the third printed circuit board; And a buffer part integrally formed with the wire spring at a connection portion of the wire spring and the third printed circuit board.

The shock absorbing portion may be formed by bending the wire spring in a zigzag shape, or may be formed by bending the wire spring in a coil spring shape.

The housing unit may include a first housing disposed above the first printed circuit board; A second housing disposed above the first housing and having the third printed circuit board installed thereon; First and second permanent magnets interposed between the first and second housings; It is preferable to include a; disposed between the first and second permanent magnet, the yoke for transmitting a magnetic force into the holder module.

The housing unit may include a first housing disposed above the first printed circuit board; A second housing disposed above the first housing and having the third printed circuit board installed thereon; First and second permanent magnets disposed on inner surfaces of the first and second housings; It is preferable to include a; disposed between the first and second permanent magnet, the yoke for transmitting a magnetic force into the holder module.

According to an exemplary embodiment of the present invention, a shield can having a through hole at a position corresponding to the connecting portion of the third printed circuit board and the wire spring and the lens module may be installed to surround the housing unit. have.

The holder module may include an outer blade having a first coil wound around an outer circumferential surface thereof; A bobbin elastically supported by an elastic member on the upper side of the outer blade, arranged to be movable up and down inside the outer blade, and having a second coil wound around its outer circumferential surface, and having at least one lens installed therein; And upper and lower elastic members disposed at upper and lower sides of the bobbin, respectively, to elastically support the bobbin with respect to the outer blade, wherein the center of the first coil has magnetic force invested in the second coil side. It is preferable that a space portion is formed so that it is formed.

In addition, the yoke is preferably formed to protrude near the center toward the holder module.

The holder module may include an outer blade having a first coil wound around an outer circumferential surface thereof; A bobbin elastically supported by an elastic member on the upper side of the outer blade, arranged to be movable up and down inside the outer blade, and having a second coil wound around its outer circumferential surface, and having at least one lens installed therein; And upper and lower elastic members disposed at upper and lower sides of the bobbin, respectively, to elastically support the bobbin with respect to the outer blade.

The second printed circuit board is preferably installed on the bottom surface of the outer blade.

The second printed circuit board is preferably fixed to the bottom surface of the outer blade and the adhesive member.

The wire spring may be made of a metal material and may be electrically connected to the second and third printed circuit boards.

In addition, at least six wire springs are provided to supply two polarities for auto focusing control and four polarity powers for driving OIS to the holder module through connection with the second and third printed circuit boards. It is desirable to.

In addition, it is preferable that the wire springs are arranged at two corner portions of the holder module with the same length, and a total of eight wire springs are provided.

In this case, it is preferable that the second coil is electrically connected to the lower spring, and the lower spring is electrically connected to the wire spring in the second printed circuit board.

In addition, the second coil may be directly connected to the second printed circuit board to enable electricity.

In addition, a space portion may be formed at the center of the first coil so that magnetic force may be invested into the second coil side.

The present invention has a shock absorbing portion in the wire spring to absorb the load applied repeatedly, it can be firmly connected to the connection portion of the printed circuit board.

In addition, even if the wire spring receives excessive force during the assembly process of the lens module, it is possible to absorb the force applied excessively in the shock absorbing member, thereby improving assembly performance and minimizing component loss due to poor assembly.

1 is a schematic plan view of a camera module according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1,
3 is a side view of a camera module according to an embodiment of the present invention;
4 is a side view illustrating a state in which the shield can of FIG. 3 is removed;
5 is an enlarged view of a portion B of FIG. 2 according to the first embodiment of the present invention; and
6 is an enlarged view of a portion B of FIG. 2 according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 is a schematic plan view of a camera module according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is a side view of the camera module according to an embodiment of the present invention, and FIG. 4 is a shield of FIG. 3. 5 is an enlarged view of a portion B of FIG. 2 according to a first embodiment of the present invention, and FIG. 6 is a view of FIG. 2 according to a second embodiment of the present invention. The enlarged view of the portion B.

As shown in FIG. 2, which shows a schematic plan view of FIG. 1 and a schematic side view showing an AA section of FIG. 1, the camera module according to the present invention includes a first printed circuit board 10 and a housing unit 20. , A holder module 30, a second printed circuit board 40, a third printed circuit board 50, a wire spring 60, and a buffer unit 100.

The first printed circuit board 10 is mounted on the image sensor 11 in the vicinity of the center thereof and is preferably provided as a PCB substrate. The first printed circuit board 10 may be provided with a plurality of terminal portions for arranging components for operating the image sensor 11 or for supplying power and outputting information of the image sensor 11 .

The housing unit 20 is disposed on the first printed circuit board 10 to form a skeleton of the camera module. According to a preferred embodiment of the present invention, the housing unit 20 includes a first housing 21, a second housing 22, first and second permanent magnets 23 and 24, and a yoke 25, .

The first housing 21 is disposed on an upper surface of the first printed circuit board 10 as a base and spaced apart from the image sensor 11 by a predetermined distance. The first housing 21 may further include a filter member for filtering an image incident on the image sensor 11 if necessary.

The second housing 22 is disposed on the upper side of the first housing 21 to cover the first housing 21. An opening is formed in the vicinity of the center of the second housing 22 at a position corresponding to the image sensor 11. The third printed circuit board 50, which will be described later, is adhesively fixed to the upper side of the second housing 22 by a fixing member such as a double-sided tape or an adhesive, but is not limited thereto. The third printed circuit board 50 may be provided with a separate third housing such as a case or a shield can, and the third printed circuit board 50 may be fixed to the inner surface thereof with the fixing member. If the third housing is provided, the third printed circuit board 50 may be pressed and supported by the third housing without a separate fixing member.

The first and second permanent magnets 23 and 24 are interposed between the first and second housings 21 and 22 so that a magnetic force is applied to the holder module 30. The first and second permanent magnets 23 and 24 may be provided in the same size. Also, the first and second permanent magnets 23 and 24 and the yoke 25 may be disposed on the inner side surfaces of the first and second housings, if possible, within the design tolerance range.

On the other hand, when the sizes of the first and second permanent magnets 23 and 24 become larger, the OIS driving becomes larger even with a small current, and if the first and second permanent magnets 23 and 24 have a constant size, In this case, the OIS driving becomes larger as the current flowing through the first and second coils 31a and 32a disposed at positions corresponding to the first and second permanent magnets 23 and 24 increases. In conclusion, the larger the size of the first and second permanent magnets 23 and 24 is, the better OIS driving is, but it is desirable to design the optimum size within other design allowances.

The yoke 25 is interposed between the first and second permanent magnets 23 and 24. The yoke 25 is provided in a shape protruding near the center so that the magnetic force of the first and second permanent magnets 23 and 24 can be invested into the inner space of the holder module 30. Preferably, the width is provided in the same manner as the first and second permanent magnets 23 and 24, and the center is protruded by a predetermined size so that the permanent magnet and the yoke are formed to have a substantially "T" desirable.

The holder module 30 is spaced apart from the inner bottom surface of the housing unit 20 by a predetermined distance. The holder module 30 includes an outer blade 31 and a bobbin 32. The holder module 30 can perform pendulum movement in the forward / backward / left / right and diagonal directions while being suspended from the wire spring 60.

Spring members 35 and 36 are provided on the upper side and the lower side of the outer blade 31 and are elastically supported by the spring member 35 so as to be able to move upward and downward in the bobbin 32.

As shown in FIG. 1, the outer blade 31 has a total of four first coils 31a to 31d wound on the outer circumferential surface of four sides, and the four side central portions around which the coils 31a to 31d are wound There is no coil. The yoke 25 may be disposed at a position corresponding to the opened space and the yoke 25 may be partially inserted into the space.

The second printed circuit board 40 may be fixed to the bottom of the outer blade 31 by a fixing member 33 such as a double-sided tape or an adhesive. The outer blade 31 may be moved back and forth, left and right or diagonally as shown in the arrow of FIG. 2 according to the interaction between the magnetic force of the first and second permanent magnets 22 and 23 and the first coil 31a. Hanging by a plurality of wire springs 60 to be movable, spaced apart from the bottom surface of the first housing 21 by a predetermined interval.

In addition, a plurality of spring through holes 37 may be provided in the outer blade 31 so that the wire spring 60 may pass through and be connected to the second printed circuit board 40.

The bobbin (32) is arranged such that the outer blade (31) is vertically movable inside and at least one lens (34) is installed therein. A second coil 32a is wound on the outer circumferential surface of the bobbin 32. The second coil 32a is connected to the first coils 31a to 31d of the outer blade 31 through the yoke 25, And moves up and down the bobbin 32 by interaction with the magnetic force that is invested through the open space. The larger the size of the yoke 25, the better the AF drive, but this also depends on the optimum design value. The focus of the image transmitted to the image sensor 11 can be automatically adjusted by the bobbin 32 moving up and down.

The second printed circuit board 40 is disposed on the bottom surface of the outer blade 31 as described above, so that the wire spring 60 can supply power to the first and second coils 31a and 32a. Connected. The connection can be done in any way as long as it can be connected by soldering or other conductive material. That is, as shown in FIG. 2, the connecting portion w ′ of the second printed circuit board 40 is connected to the first and second coils 31a and 32a, respectively, to form the wire spring 60. The power supplied through) is transferred to the first and second coils 31a and 32a to form an electromagnetic force.

In this case, in the case of the second coil 32a, the second coil 32a may be directly connected to the second printed circuit board 40, and as shown in FIG. 2, first, the lower coil 36 is connected to the lower spring 36. ) May be connected to the second printed circuit board 40.

The third printed circuit board 50 is fixed to the upper side of the second housing 22 by a fixing member such as a double-sided tape and an adhesive member, as described above, wherein the third printed circuit board 50 is connected to the first printed circuit board 10. The power transmitted through the terminal portion 52 of the printed circuit board 50 is transmitted to the second printed circuit board 40 through the wire spring 60 connected with the second printed circuit board 40. The connection can be done in any way as long as it can be connected by soldering or other conductive material.

As shown in FIGS. 3 and 4, the third printed circuit board 50 is provided to cover one wall surface of the first and second housings 21 and 22. A window 55 is formed on a surface facing the second permanent magnets 23 and 24 and the yoke 25, and may be configured to avoid interference with them.

This is because the first and second permanent magnets 23 and 24 and the yoke 25 are directly attached to the shield can 70 to be described later by fixing means such as epoxy.

Meanwhile, the second printed circuit board 40 and the third printed circuit board 50 may be a flexible printed circuit board (FPCB), a printed circuit board (PCB), or an R-FPCB (Rigid FPCB integrated type). The present invention is not limited thereto, and may be any substrate that allows electrical connection.

Both ends of the wire spring 60 are connected to the second and third printed circuit boards 40 and 50. At this time, one end of the wire spring 60, as shown in Figure 5, is connected from the pad 51 formed on the third printed circuit board 50, the wire spring in the center of the pad 51 The through hole 53 through which the 60 passes is formed. The connection can be done in any way as long as it can be connected by soldering or other conductive material. Meanwhile, a solder register (SR) is provided around the pad 51 to protect the surface of the third printed circuit board 50, and the pad 51 region may be soldered open to be electrically connected. have.

In this way, the wire spring 60 connected from the pad 51 supplies the power supplied through the terminal portion 52 to the second printed circuit board 40, so that the first and second coils 31a ( 32a) enables interaction with the first and second permanent magnets 23,24.

In addition, as shown in FIG. 2, the other end of the wire spring 60 passes through a spring through hole 37 formed in the outer blade 31 and is provided on the bottom surface of the outer blade 31. It is connected to the printed circuit board 40. In this case, the other end of the wire spring 60 is connected to a pad (not shown) formed on the second printed circuit board 40, like the third printed circuit board 50, although not shown. In the center of the (not shown) is formed a through hole (not shown) through which the wire spring 60 passes. The connection can be done in any way as long as it can be connected by soldering or other conductive material. According to this configuration, the outer blade 31 may be suspended from the wire spring 60, and may be spaced apart from the bottom surface of the first housing 21 by a certain distance. The outer blade 31 performs the pendulum motion according to the interaction between the first coil 31a and the first and second permanent magnets 23 and 24 so that the outer blade 31 can be corrected by the interaction of the first coil 31a and the first and second permanent magnets 23, 24. For this purpose, it is preferable that the wire spring 60 is made of a metal material which is elastic and able to withstand an impact, and is made conductive.

On the other hand, the thinner the thickness of the wire spring 60, the better the mobility for correcting the shaking motion even with a small current, which may vary depending on the optimum design value. Preferably, the thickness of the wire spring 60 is several 탆 to several hundred 탆, preferably 1 to 100 탆.

In addition, the wire spring 60 is preferably provided with at least six or more, at least two polarities for auto focusing control and four polarity power supplies for image stabilization movement second and third printed circuits It is necessary to supply the holder module 30 through the connection with the substrates 40 and 50.

According to a preferred embodiment of the present invention, as shown in FIG. 1 and FIG. 2, it is preferable that a total of 8 pieces are provided at the corner portions of the holder module 30 with the same length, .

On the other hand, as shown in Figure 2, if further comprises a separate third housing, such as the shield can 70, as described above, the third printed circuit board 50 is the first and second permanent Since the magnets 23 and 24 and the yoke 25 are fixedly bonded to the shield can 70 by epoxy or the like, in order to avoid this coupling portion, a window 55 is formed to form the window 55 and the first and second housings. (21) It covers the side wall surface of 22.

If the shield can 70 is removed, the third printed circuit board 50 may be formed of a PCB or the like, and the first and second permanent magnets 23 and 24 and the yoke may be formed therein. It is also possible to attach and fix 25, and as described above, the third printed circuit board 50 may be made of a PCB, and the window 55 as described above is provided to provide the The first and second permanent magnets 23 and 24 and the yoke 25 can be inserted and further configured to be reinforced with a shielding tape or the like.

The buffer unit 100 may be integrally formed in a portion of the wire spring 60. As shown in FIG. 5, the shock absorbing part 100 may be formed by bending the wire spring 60 in a zigzag form, or as shown in FIG. 6, by bending the coil spring in a coil spring shape. Do.

In this case, the buffer part 100 may design the shape of the second housing 22 at a position that does not interfere with the second housing 22 of the wire spring 60.

The buffer unit 100 has a structure of a normal light down narrow, as shown in Figures 5 and 6, it is preferably provided in a conical funnel shape that narrows toward the lower side. The support hole 122 is formed through the coaxial with the through-hole 53, preferably corresponding to or larger than the diameter of the through-hole (53).

The diameter of the through hole 53 is preferably formed to be slightly larger than the diameter of the wire spring 60, the soldering or when connected to the pad 51 formed on the wire spring 60 and the third printed circuit board 50 Connection materials such as other conductive materials may be designed to flow down through the through hole 53 so as to be connected to and fixed to the wire springs 60 on both upper and lower surfaces of the third printed circuit board 50.

The diameter of the support hole 122 is preferably formed to be slightly larger than the diameter of the wire spring 60, it may be the same as or larger than the diameter of the through hole (53). That is, the wire spring 60 may be designed to prevent interference by contacting the second holder 22 near the support hole 122.

 The buffer unit 100 configured as described above serves to absorb the load added to the wire spring 60, thereby reducing the load added to the pad 51 provided on the third printed circuit board 50. The load added directly to the connecting portion w fixing the wire spring 60 can be reduced.

On the other hand, after assembling the bobbin 32 and the outer blade 31, the general assembly sequence is the second housing 22, the second and third printed circuit board 40, 50 and the wire spring (using a jig) 60, the bobbin 32 provided with the lens barrel is coupled, and then the first housing 21 is connected and mounted on the first printed circuit board 10. Before connecting the first housing 21, the permanent magnet and the yoke coupling may be made first. This assembly order may be changed as necessary. That is, it may be possible directly in the equipment without jig. In this process, even if the force for inserting and combining the bobbin 32 provided with the lens barrel acts too largely to impose the connection portion (w), the buffer unit 100 can absorb this excessive force.

That is, the buffer part 100 is the wire spring 60 in the vicinity of the connection portion (w) of the wire spring 60 and the third printed circuit board 50, as shown in Figs. ) And the load generated when the load is pulled in the direction of gravity or shaken from side to side is absorbed by the strain energy of the buffer unit 100.

Therefore, the connection work can be performed again due to the breakage of the connection part (w) during the assembly process, or the trouble of the parts being unusable can be prevented, and a more reliable camera module can be produced.

On the other hand, according to a preferred embodiment of the present invention, the through hole in the position corresponding to the lens module 30 around the connection portion (w) of the third printed circuit board 50 and the wire spring 60, the housing It may further include a shield can 70 is installed to surround the unit (21) (22). In this case, as described above, the third printed circuit board 50 may be attached and fixed to the inner circumferential surface of the shield can 70. Meanwhile, the shield can 70 is not necessarily required, and may be omitted depending on the configuration of the housing units 21 and 22.

2, the hook unit 80 may be provided on four sides or at least one side of the shield can 70 in order to fix the shield can 70 to the first housing 21. As shown in FIG. The position may be within a range allowed by the center or edge design, and the number may be one or more.

The hook unit 80 may include a hook 81 protruding from the first housing 21 and a hook hole 82 formed through the shield can 70 facing the hook 81 , And may be configured as the opposite if necessary.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10; A first printed circuit board 20; The housing unit
21; A first housing 22; Second housing
23; A first permanent magnet 24; The second permanent magnet
25; Yoke 30; Holder module
31; An outer blade 31a; The first coil
32; Bobbin 32a; The second coil
40; A second printed circuit board 50; 3rd printed circuit board
51; Pad 52; Terminals
53; Through 60; Wire spring
70; Shield can 100; Buffer
W; Connection 122; Support hole

Claims (17)

A first printed circuit board on which an image sensor is mounted;
A housing unit disposed on the first printed circuit board;
A holder module disposed at a distance from the bottom surface of the housing unit, the holder module including a first coil wound around an outer circumferential surface thereof and including at least one lens therein;
A second printed circuit board coupled to the bottom surface of the holder module;
A third printed circuit board installed above the holder module;
A plurality of wire springs having one end connected to the second printed circuit board and the other end connected to the third printed circuit board; And
And a buffer part integrally formed with the wire spring at a connection portion of the wire spring and the third printed circuit board.
The method of claim 1, wherein the buffer portion,
Camera module to form the wire spring bent in a zigzag.
The method of claim 1, wherein the buffer portion,
Camera module for forming the wire spring by bending the coil spring shape.
The connector according to claim 1, wherein the housing unit comprises:
A first housing disposed above the first printed circuit board;
A second housing disposed above the first housing and having the third printed circuit board installed thereon;
First and second permanent magnets interposed between the first and second housings;
And a yoke disposed between the first and second permanent magnets to transfer a magnetic force into the holder module.
The connector according to claim 1, wherein the housing unit comprises:
A first housing disposed above the first printed circuit board;
A second housing disposed above the first housing and having the third printed circuit board installed thereon;
First and second permanent magnets disposed on inner surfaces of the first and second housings;
And a yoke disposed between the first and second permanent magnets to transfer a magnetic force into the holder module.
The method of claim 1,
And a shield can having a through hole at a position corresponding to the connection portion of the third printed circuit board and the wire spring and the lens module, the shield can being installed to surround the housing unit.
The optical module according to claim 1,
An outer blade having a first coil wound around an outer circumferential surface thereof;
A bobbin elastically supported by an elastic member on the upper side of the outer blade, arranged to be movable up and down inside the outer blade, and having a second coil wound around its outer circumferential surface, and having at least one lens installed therein; And
And upper and lower elastic members disposed on upper and lower sides of the bobbin to elastically support the bobbin with respect to the outer blade,
Wherein a center portion of the first coil is formed with a space portion so that a magnetic force can be invested in the second coil.
The method according to claim 4 or 5,
The yoke is a camera module protruding near the center toward the holder module.
The optical module according to claim 1,
An outer blade having a first coil wound around an outer circumferential surface thereof;
A bobbin elastically supported by an elastic member on the upper side of the outer blade, arranged to be movable up and down inside the outer blade, and having a second coil wound around its outer circumferential surface, and having at least one lens installed therein; And
And upper and lower elastic members disposed on the upper side and the lower side of the bobbin to elastically support the bobbin with respect to the outer blade.
The method of claim 9,
The second printed circuit board is a camera module installed on the bottom surface of the outer blade.
11. The method of claim 10,
The second printed circuit board is a camera module fixed to the bottom surface of the outer blade and the adhesive member.
The wire springs according to claim 1,
The camera module is made of a metal material and is electrically connected to the second and third printed circuit boards.
The wire springs according to claim 1,
At least six or more camera modules are provided to supply two polarities for auto focusing control and four polarities for driving OIS to the holder module through connection with the second and third printed circuit boards.
The method of claim 13, wherein the wire spring,
Two camera module modules are provided in the corner module of the holder module with the same length.
The method of claim 9,
The second coil is electrically connected to the lower spring,
The lower spring is a camera module that is electrically connected to the wire spring in the second printed circuit board.
The method of claim 9,
The second coil is connected to the second printed circuit board directly connected to the camera module.
The method of claim 9,
Wherein a center portion of the first coil is formed with a space portion so that a magnetic force can be invested in the second coil.

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