KR101835146B1 - Camera Module - Google Patents

Abstract

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 mounted on the holder module; A plurality of wire springs, one end of which is connected to the second printed circuit board and the other end of which is connected to the third printed circuit board; And an impact absorbing portion formed on a sidewall of the housing unit and elastically deforming when the shock of the housing unit is generated.

Description

Camera module {Camera Module}

The present invention relates to a camera module.

In the case of a camera module mounted on a small electronic product, the camera module may be frequently hit during use, and the camera module may be shaken finely due to hand shake or the like during shooting. Taking these points into consideration, a camera module having an anti-shake device has recently been disclosed.

For example, Korean Patent Registration No. 10-0741823 (registered Jul. 14, 2007) discloses a gyro sensor IC or an angular velocity sensor installed inside a device in which a camera module such as a mobile phone is mounted for correction of a hand- Is introduced.

However, when a separate angular velocity detection sensor is provided as described above, a separate detection sensor must be provided in order to realize the anti-shake function, thereby increasing the manufacturing cost. In addition, in order to construct and install the anti- There is a hassle to provide space.

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

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 mounted on the holder module; A plurality of wire springs, one end of which is connected to the second printed circuit board and the other end of which is connected to the third printed circuit board; And an impact absorbing portion formed on a sidewall of the housing unit and elastically deforming when the shock of the housing unit is generated.

The housing unit may include: a first housing disposed on the first printed circuit board; A second housing disposed above the first housing and having the third printed circuit board mounted on an upper side thereof; First and second permanent magnets interposed between the first and second housings; And a yoke disposed between the first and second permanent magnets to transmit a magnetic force to the holder module, wherein the shock absorber is formed in the second housing.

The shock absorber may be formed on a sidewall of the second housing and may include at least one groove formed at a predetermined depth on a sidewall of the second housing.

It is preferable that the groove has a depth smaller than the thickness of the second housing.

According to a preferred embodiment of the present invention, the shock absorber is provided with at least three grooves formed at a predetermined depth on the entire sidewall of the second housing, each groove having the same depth, The first housing and the second housing are spaced apart from each other by a predetermined distance.

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

At this time, the second printed circuit board is preferably installed on the bottom surface of the outer blade, and is preferably fixed to the bottom surface of the outer blade with an adhesive member.

It is preferable that the wire spring is made of a metal material and is electrically connected to the second and third printed circuit boards.

In addition, at least six wire springs are provided to supply two polarities for autofocusing control and four polarity power sources for OIS driving to the holder module through connection with the second and third printed circuit boards .

The wire springs may have the same length, and two wire springs may be arranged at the corner portions of the holder module, and a total of eight wire springs may be provided.

The present invention has a buffer part in the camera module so that it can absorb the load repeatedly applied to the wire spring, so that the wire spring can be firmly connected to the connection part of the printed circuit board.

Further, even if the wire spring receives an excessive force during the assembly process of the lens module, the excessive force can be absorbed by the cushioning member, so that not only the assembling property but also the component loss due to the assembly failure can be minimized.

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,
FIG. 4 is a side view showing a state in which the shield can of FIG. 3 is removed,
5 and 6 are enlarged views of a portion B in FIG. 2, and are cross-sectional views schematically showing an operation state of the shock absorber according to an 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 sectional view taken along the line AA of Fig. 1; Fig. 3 is a side view of a camera module according to an embodiment of the present invention; FIGS. 5 and 6 are enlarged views of a portion B of FIG. 2, and are cross-sectional views schematically showing an operation state of the shock absorber according to an embodiment of the present invention.

2, the camera module according to the present invention includes a first printed circuit board 10, a housing unit 20, and a second printed circuit board 10, A holder module 30, a second printed circuit board 40, a third printed circuit board 50, a wire spring 60, and a shock absorber 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 to be described later is adhered and fixed to the upper surface of the second housing 22 by a fixing member such as a double-sided tape or an adhesive. However, the present invention is not limited thereto, The third printed circuit board 50 may be provided with a separate third housing such as a case or shield can and the third printed circuit board 50 may be fixed to the inner side of the third printed circuit board 50 with the fixing member. If the third housing is provided, the third printed circuit board 50 may be pushed 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. It is preferable that the first and second permanent magnets 23 and 24 have 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, if the size of the first and second permanent magnets 23 and 24 increases, the OIS drive becomes large even if the current is small. If the first and second permanent magnets 23 and 24 are constant in size , The OIS drive becomes larger as the currents flowing through the first and second coils 31a and 32a disposed at positions corresponding to the first and second permanent magnets 23 and 24 are increased. As a result, the larger the size of the first and second permanent magnets 23 and 24, the better the OIS drive, but it is desirable to design the optimal size within other design tolerances.

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 and lower sides of the outer blade 31 so as to be elastically supported by the spring member 35 so that the bobbin 32 can move upward and downward.

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 surface of the outer blade 31 with a fixing member 33 such as double-sided tape or adhesive. The outer blade 31 is rotated in the longitudinal, left and / or diagonal directions as shown by arrows in FIG. 2 in accordance with the interaction between the magnetic forces of the first and second permanent magnets 22 and 23 and the first coil 31a And is spaced apart from the bottom surface of the first housing 21 by a predetermined distance.

A plurality of spring through holes 37 may be formed in the outer blade 31 so that the wire spring 60 penetrates the outer blade 31 and is 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 be connected to the first and second coils 31a and 32a . The connection can be done in any way as long as it can be connected by soldering or other conductive material. That is, the connection portion w 'of the second printed circuit board 40 is connected to the first and second coils 31a and 32a, respectively, as shown in FIG. 2, To the first and second coils 31a and 32a so as to form an electromagnetic force.

In this case, the second coil 32a may be directly connected to the second printed circuit board 40 and connected to the lower spring 36 first, as shown in FIG. 2. Then, 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 portion of the second housing 22 by a fixing member such as a double sided tape or an adhesive member as described above. The power transmitted through the terminal portion 52 of the printed circuit board 50 is transferred 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 side wall of the first and second housings 21 and 22, A window 55 may be formed on the surface facing the second permanent magnets 23 and 24 and the yoke 25 so that interference with them can be avoided.

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.

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) But the present invention is not limited thereto, and any substrate can be used as long as it is electrically connected.

The wire springs 60 are connected at both ends to the second and third printed circuit boards 40 and 50 by soldering. However, the wire springs 60 are not limited thereto.

The wire spring 60 connected to the pad 51 supplies the power supplied through the terminal unit 52 to the second printed circuit board 40 so that the first and second coils 31a 32a are allowed to interact with the first and second permanent magnets 23, 24.

2, the other end of the wire spring 60 passes through a spring through hole 37 formed in the outer blade 31, and a second end of the wire spring 60, And is connected to the printed circuit board 40. 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, (Not shown) through which the wire springs 60 are inserted is formed at the center of the base plate (not shown). 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, it is preferable that at least six wire springs (60) are provided, and at least two polarities for auto focus control and four polarity power sources for correction of camera shake correction movement are provided to the second and third printed circuits It is necessary to supply the holder module 30 through the connection with the substrate 40 (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, .

2, the third printed circuit board 50 may include a third housing, such as the shield can 70, as described above. In this case, The magnets 23 and 24 and the yoke 25 are fixedly coupled to the shield can 70 by epoxy or the like so that a window 55 is formed in order to avoid this coupling portion, (21) (22).

If the shield can 70 is omitted, the third printed circuit board 50 is formed of PCB or the like, and the first and second permanent magnets 23 and 24 and the yoke The third printed circuit board 50 is formed of a PCB as described above. The above-described window 55 may be provided, and the window 55 may be provided with the above- 1 and the second permanent magnets 23 and 24 and the yoke 25 may be inserted into the yoke 25 and the yoke 25 may be further reinforced by a shielding tape or the like.

2, 5 and 6, the shock absorber 100 may be formed on the side wall of the second housing 22 and may be formed on the side wall of the second housing 22 at a predetermined depth At least one groove may be provided. The shock absorbing portion 100 formed with the groove may have a depth less than the thickness of the second housing 22. [

According to a preferred embodiment of the present invention, the shock absorbing part 100 may be provided with at least one groove formed at a predetermined depth on the entire side wall of the second housing 22.

At this time, each of the grooves has the same depth, and can be formed in a state of being spaced apart from another neighboring groove by a predetermined distance. In addition, the shock absorbing portion 100 may be formed at an intersection of the outer side surface and the inner side surface of the second housing 22, as shown in FIG.

When the shock absorber 100 is formed, the cross section of the side wall of the second housing 22 is provided in a zigzag shape. Therefore, when an external impact is applied to the second housing 22, Since the second housing 22 can be elastically deformed with both side walls of the shock absorbing part 100 formed as grooves being close to each other, the external impact energy can be converted into the displacement energy of the second housing 22 . As a result, the shock absorber 100 can absorb an external impact through the elastic deformation of the second housing 22. As a result, the connection between the wire spring 60 and the third printed circuit board 50 the load due to the movement of the holder module 30 transmitted to the wrist can be reduced, and the damage of the connection portion w can be minimized.

The same effect can be expected even if the shock absorbing part 100 is replaced with a material which can be elastically deformed only by the material of the side wall of the second housing 22. [ However, when a material such as silicon or rubber is used which is too soft, it is necessary to maintain a certain level of strength or more because the movement of the holder module 30 may be greatly affected.

According to a preferred embodiment of the present invention, a through hole is provided at a position corresponding to the lens module 30 around the connection portion w of the third printed circuit board 50 and the wire spring 60, And a shield can 70 installed to enclose the units 21 and 22. In this case, as described above, the third printed circuit board 50 may be fixedly attached 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 the range allowed by the design such as center or edge, 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; The 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; The third printed circuit board
51; Pad 52; Terminals
53; Hole 60; Wire spring
70; Shield can 100; Shock absorber
W; Connection

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 on 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 mounted on the holder module;
A plurality of wire springs, one end of which is connected to the second printed circuit board and the other end of which is connected to the third printed circuit board; And
And a shock absorbing part formed on a side wall of the housing unit and elastically deforming when an impact is generated in the housing unit.
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 mounted on an upper side thereof;
First and second permanent magnets interposed between the first and second housings;
And a yoke disposed between the first and second permanent magnets for transmitting magnetic force to the holder module,
Wherein the shock absorber is formed in the second housing.
The shock absorber according to claim 2,
And the second housing is formed on the side wall of the second housing.
The shock absorber according to claim 3,
And at least one groove formed at a predetermined depth on a side wall of the second housing.
The method of claim 4,
The second housing having a depth less than the thickness of the second housing.
The shock absorber according to claim 3,
At least three grooves formed at a predetermined depth on the entire side wall of the second housing,
Wherein each of the grooves has an equal depth and is formed at an intersection of an outer side surface and an inner side surface of the second housing in a state of being spaced apart from other adjacent grooves by a predetermined distance.
The optical module according to claim 1,
An outer blade having an outer circumferential surface on which the first coil is wound;
A bobbin which is supported by an elastic member on an upper side of the outer blade and is arranged to be movable up and down inside the outer blade, a second coil is wound on an outer circumference of the outer blade, and at least one lens is installed therein; And
And upper and lower elastic members disposed on the 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.
5. The method according to claim 4 or 5,
Wherein the yoke protrudes from the center of the yoke toward the holder module.
The optical module according to claim 1,
An outer blade having an outer circumferential surface on which the first coil is wound;
A bobbin which is supported by an elastic member on an upper side of the outer blade and is arranged to be movable up and down inside the outer blade, a second coil is wound on an outer circumference of the outer blade, and at least one lens is 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.
10. The method of claim 9,
And the second printed circuit board is installed on a bottom surface of the outer blade.
11. The method of claim 10,
Wherein the second printed circuit board is fixed to the bottom surface of the outer blade by an adhesive member.
The wire springs according to claim 1,
And is connected to the second and third printed circuit boards so as to be energizable.
The wire springs according to claim 1,
Wherein at least six polarity supplies for polarity control and four polarity power supplies for OIS driving are provided to the holder module through connection with the second and third printed circuit boards.
14. The wire springs according to claim 13,
Two camera module modules are provided in the corner module of the holder module with the same length.
10. The method of claim 9,
The second coil is connected to the lower spring to be energizable,
Wherein the lower spring is electrically connected to the wire spring on the second printed circuit board.
10. The method of claim 9,
And the second coil is directly connected to the second printed circuit board.
10. 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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