KR20060121666A - Camera module - Google Patents

Abstract

A camera module is provided to fix a holder onto a substrate with a predetermined strength even when the area of the fixed face is reduced in order to decrease the size of the camera module. A camera module includes a substrate(1) on which an image pickup element is set and a holder(5) fixed onto the substrate to hold a lens(25). A part(16) larger than the fixed portion(15) of the holder is formed at a part of the portion of the substrate to which the holder is fixed. An adhesive layer(61) is formed of an adhesive to attach the holder to the substrate. An adhesive fillet(62,63) is formed in contact with the adhesive layer to attach the part larger than the fixed portion of the holder to a portion adjacent to the side of the holder.

Description

Camera Module {CAMERA MODULE}

1 is a cross-sectional view of FIG. 2 showing an embodiment of the present invention, where (a) is an enlarged cross-sectional view taken along the line A-A, and (b) is a partially enlarged cross-sectional view taken along the line B-B.

Fig. 2 is a plan view showing one embodiment of the present invention.

3 is a front view of FIG. 2.

4 is a perspective view of FIG. 2 (not shown in the figure).

Fig. 5 is a perspective view showing barrel 2 (joint support for the annular elastic body 4 and not shown in the drawing) of the bolt 2 in Figs. 1 to 4, wherein (a) is an oblique view from above; (b) is the figure which inverted top and bottom of (a).

Fig. 6 is a perspective view showing the pedestal 5 (not shown in the drawings for the nut thread 53 in Fig. 1) in Figs. 1 to 4, wherein (a) is an oblique view from above, and (b) is a It is a figure which inverted up and down.

Fig. 7 is a perspective view showing the fixing surface of the substrate 1 and the pedestal 5, where (a) shows the fixing surface 55 of the pedestal 5 (the illustration of the nut part 53 for the nut is omitted), and (b) shows the substrate 1 ( The fixing surface 15 of the photographing element 11 or the circuit elements 12 to 14 is omitted.

8 is a cross-sectional view showing a state before screwing the barrel 2 to the pedestal 5 fixed to the substrate 1;

9 is a sectional view showing a conventional example.

* Explanation of symbols for main parts of drawings *

One… Substrate 15... Fixed surface of board 1

16, 17... Release part of the fixed surface 15

2… Barrel (example of first supporting member) 26... Thread for Bolt

30... Photocurable adhesive 31. Recess

5... Pedestal (example of second supporting member) 53. Thread for Nut

55... Fixed surface 56 of base 5... Stopper part

60... Adhesive 61... Adhesive layer

62, 63... Adhesive fillet 7... Support member

The present invention relates to a camera module for use in a cellular phone, a portable terminal, or the like.

In the conventional camera module, for example, as shown in Fig. 9, a circuit board 103 (hereinafter simply referred to as a substrate) 103 provided with the photographing element 101, a barrel 107 on which lenses 105 and 105 are supported, a barrel 107 and a screw And the base 113 fixed to the substrate 103 by the adhesives 109 and 111, together with the support of the barrel 107, and by adjusting the screwing amount of the barrel 107 and the base 113 between the lens 105, 105 and the photographing element 101. The distance (that is, the focal length of the lenses 105 and 105) was adjusted (see Patent Document 1, for example).

The fixing of the barrel 107 and the base 113 after adjustment was performed by inject | pouring an adhesive agent into the screw engaging part 115 of the barrel 107 and the base 113, for example (refer patent document 2).

Patent Document 1: Japanese Unexamined Patent Publication No. 2004-297282

Patent Document 2: Japanese Unexamined Patent Publication No. 2003-172859

However, in the above-described conventional example, since the fixed surfaces of the pedestal 113 and the substrate 103 are relatively large, the fixed strength of the pedestal 113 and the substrate 103 is not a problem, but in order to reduce the size of the camera module, the pedestal 113 and the substrate are smaller. If the area of the fixing surface of 103 is narrowed, there is a problem that the fixing strength of the pedestal 113 and the substrate 103 becomes weak.

For example, in order to reduce the size of the camera module, when the length of the substrate 103 is approximately 6 mm, the width of the approximately square annular fixed surface formed on the lower surface of the base 113 is about 0.3 mm (that is, The thickness of the side wall was narrowed to about 0.3 mm), and there was a problem in that a portion where the adhesive was not attached due to the twisting of the fixing surface generated during resin molding of the pedestal 113 was generated and destroyed by stress concentration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in order to reduce the size of the camera module, even if the area of the fixed surface is narrowed (for example, the width of the fixed surface is narrowed, such as 0.3 mm) or the surface is distorted, It is an object of the present invention to provide a camera module capable of setting a fixed strength of a substrate and a supporting member (for example, a pedestal) to a predetermined strength even if it is formed.

The invention of claim 1 is a camera module having a substrate on which a photographing element is installed and a support member that supports a lens and is fixed on the substrate, wherein the substrate is provided on a portion of a fixing surface with the support member on the substrate. Forming a release portion having a larger area than the corresponding portion of the fixing surface of the fixing surface, and forming an adhesive layer for adhering the fixing surface of the substrate and the facing portion of the fixing surface of the supporting member by means of an adhesive; And an adhesive fillet for adhering the release portion of the fixed surface and the portion adjacent to the release portion of the side wall of the support member.

According to the invention of claim 2, in the invention of claim 1, the fixing surface of the substrate and the fixing surface of the supporting member are formed in a substantially square annular shape so that a release portion is formed at four corners of the fixing surface of the substrate. It features.

In the invention according to claim 3, in the invention according to claim 1 or 2, the support member includes a first support member on which a lens is supported, and a first support member by screwing with the first support member to support the first support member. And a second supporting member fixed on the substrate, wherein the fixing surface with the substrate in the second supporting member is the fixing surface of the supporting member.

(Example)

1 to 8 show one embodiment of the present invention, in which 1 is a circuit board (hereinafter simply referred to as a substrate), 2 is a barrel as an example of a first support member, 4 is an elastic member. As an example, the annular elastic body 5 is a base as an example of a 2nd support member.

The barrel 2 and the base 5 support the lenses 25 and 25 and form a support member 7 fixed on the substrate 1.

As shown in Fig. 7B, the substrate 1 is formed of a synthetic resin in a substantially square plank shape, and is formed in a shape in which the four corners are cut out.

In the center portion of the upper surface of the substrate 1, as shown in Fig. 1A, photographing elements 11 and other circuit elements 12 to 14 electrically connected by wiring patterns (not shown in the drawing) are provided. Terminals for external connection (not shown in the drawings) are provided on the side and bottom surfaces of the substrate 1.

In the peripheral portion of the upper surface of the substrate 1, a fixing surface 15 as shown in Fig. 7B is formed.

The fixed surface 15 is an approximately square annular shape, and is formed in the shape which inclined the four corners by 45 degree inclination angle.

At the four corners of the fixing surface 15 and at the center of one side, there are formed 16 to 16 and 17 wider portions than the corresponding portions of the fixing surface 55 of the pedestal 5 (to be described later).

Barrel 2 is formed of a synthetic resin, and as shown in Figs. 5 (a) and 5 (b), a barrel body 21 formed in a substantially cylindrical shape, and an upper plate 22 which closes the upper opening of the barrel body 21 and protrudes an outer peripheral edge thereof. In this upper plate 22, an aperture hole 23 is formed.

Two lenses 25 and 25 are supported inside the barrel body 21, and a bolt thread 26 having bolt screws on the outer circumferential surface of the barrel body 21 is formed.

On the lower end opening side of the barrel body 21, an engagement step 28 for engaging and supporting the annular elastic body 4 is formed.

At the periphery of the upper plate 22, four recesses 31 are formed at equal intervals along the circumferential direction as shown in Figs. 5 (a) and 5 (b). It extends to the top. The recess 31 is for accommodating the photocurable adhesive 30 injected from the outside, and the photocurable adhesive 30 to be injected has a high viscosity such that it does not penetrate the screw coupling portions of the barrel 2 and the pedestal 5 and the ultraviolet ray. And curing with a visible light for a short time (for example, around 10 seconds).

The annular elastic body 4 is provided with the engaging part 41 and the contact part 42 integrally formed in the outer periphery edge by the elastic material like synthetic rubber.

The engaging portion 41 is formed in an approximately pentagonal cross section so as to be engageable with the engaging step portion 28 of the barrel body 21, and the contact portion 42 is formed in an approximately semicircular shape.

The pedestal 5 is formed of synthetic resin, and has an upper pedestal 51 formed in a substantially cylindrical shape as shown in Figs. 6 (a) and 6 (b), and a substantially quadrangular lower pedestal provided so as to be continuous under the upper pedestal 51. 52 is provided.

The upper pedestal 51 is provided with a nut thread 53 having a nut for screwing on its cylindrical inner circumferential surface, and the nut screw of the nut thread 53 is screwable with the bolt screw of the bolt thread 26 of the barrel body 21. Formed.

Inside the connecting portion of the upper pedestal 51 and the lower pedestal 52, a substantially annular stopper portion 56 which restricts the movement limit position in the screw travel direction of the bolt threaded portion 26 for the barrel 2 is formed to protrude.

Cutting grooves 57 are formed in the central portion of one side wall of the lower pedestal 52, and the cutting grooves 57 open at the upper side, the lower side, and the outer side.

The lower surface of the lower pedestal 52 is a fixed surface 55 with the substrate 1, and this fixed surface 55 is an approximately square annular as shown in Fig. 7 (a), and the four corners are inclined at an inclination angle of 45 degrees. In addition, it is formed in the shape which dug the center of one side.

The fixed surface 55 of the base 5 and the fixed surface 15 of the board | substrate 1 are being fixed by the contact bonding layer 61 formed by the adhesive agent 60, and the adhesive fillets 62 and 63.

Next, the assembly of the camera module will be described.

(1) Adhesive 60 is applied to at least one of the fixing surface 15 of the substrate 1 and the fixing surface 55 of the pedestal 5 on which the imaging elements 11 and the circuit elements 12 to 14 are mounted, and the center axis and the upper side of the light receiving surface of the imaging element 11 While the center axis of the pedestal 51 is aligned, the pedestal 5 is placed on the substrate 1 by bringing the fixing surface 15 and the fixing surface 55 into close contact with the adhesive 60 therebetween. The adhesive 60 may be any of thermosetting, room temperature curing and photocuring.

By curing the adhesive 60, an adhesive layer 61 for fixing both sides is formed in the fixing surface 15 of the substrate 1 facing the fixing surface 55 of the pedestal 5, and a predetermined portion continuous to the adhesive layer 61 is formed. To form both sides of the adhesive fillets 62 to 62 and 63.

The adhesive fillet 62 fixes the release part 16 of the fixing surface 15 of the board | substrate 1, and the part adjacent to the release part 16 in the outer side wall of the lower pedestal 52 as shown in FIG.1 (b).

As shown in the enlarged drawing of FIG. 1 (a), the adhesive fillet 63 fixes the release part 17 of the fixing surface 15 of the board | substrate 1, and the part adjacent to the release part 17 in the outer side wall of the lower pedestal 52. As shown in FIG.

As described above, since the substrate 1 and the pedestal 5 are fixed by the adhesive layers 61 and the adhesive fillets 62 to 62 and 63, the length and width of the substrate 1 are about 6 mm, and the thickness of the plate on the side wall of the lower pedestal 52 (that is, fixing) Even in a small camera module having a width of approximately 55 mm), a desired fixed strength can be obtained. For example, even when warpage occurs on the fixing surface 55 during molding of the pedestal 5 and the adhesive is hard to stick, the desired fixing strength can be obtained by the adhesive fillets 62 to 62 and 63.

(2) Subsequently, as shown in FIGS. 5 (a) and 5 (b), after the engaging portion 41 of the annular elastic body 4 is joined to the engaging step portion 28 of the barrel 2 to support the annular elastic body 4, FIGS. 8 and FIG. As shown in 1 (a), screw the bolt threaded portion 26 of the barrel 2 to the nut threaded portion 53 of the pedestal 5.

At this time, the center axes of the lenses 25 and 25 coincide with the center axis of the upper pedestal 51, and the annular elastic body 4 is pressed between the tip of the barrel 2 and the stopper portion 56 of the pedestal 5 and elastically deformed. The barrel 2 and the pedestal 5 are formed in advance so that the focal length of the lens is adjusted, and the number of threads of the bolt screw portion 20 and the nut screw portion 53 is set.

For this reason, when adjusting the screwing amount of the bolt thread part 26 and the nut thread part 53 and focusing the lens 25, 25 on the imaging element 11, the front end part of the barrel 2 and the base 5 of the barrel 2 in the state which the annular elastic body 4 was elastically deformed. The friction force between the bolt thread 26 and the nut thread 53 is reinforced by the elastic force between the stopper 56, thereby increasing the tightening force by screwing the barrel 2 and the pedestal 5, thereby increasing the spacing between the screw joints. The shift of the focal length of the lenses 25 and 25 can be prevented by

In addition, it is sufficient to insert the annular elastic body 4 between the tip of the barrel 2 and the stopper 56 of the pedestal 5, so that the size can be avoided as in the conventional example of inserting the pressure-contacting member and the leaf spring. have.

(3) Subsequently, a photocurable adhesive 30 is injected into the recesses 31 to 31 of the barrel 2 to fix the barrel 2 and the pedestal 5 as shown in Fig. 1 (a).

At this time, the photocurable adhesive 30 has a high viscosity such that the photocurable adhesive 30 does not penetrate the threaded portions of the barrel 2 and the pedestal 5, so that the photocurable adhesive 30 is formed from the recess 31 by the bolt thread 26 and the nut screw 53. Barrier 2 and pedestal 5 can be fixed by curing the photocurable adhesive 30 in a short time (for example, after 10 seconds) by ultraviolet rays or visible light because it does not penetrate into the gap between the screws of the screw.

The camera module assembled as described above is mounted on a wiring circuit board such as a mobile phone or a mobile terminal via the camera module connector or directly.

In the said embodiment, although the shape corresponding to the mold release part of the fixing surface of a board | substrate and a 2nd support member was described in the case where all four corners of square annular were formed inclined at 45 degree inclination angle, this invention is limited to this. Instead, the four corners of the fixing surface of the substrate are formed in an arc shape or a rectangular shape, and the four corners of the second supporting member are formed in an arc shape. It can be used also when the mold release part with a larger area than a corresponding part is formed.

In the above embodiment, the fixing surface of the substrate and the second supporting member is formed in a substantially square ring shape, and the area of the fixing surface of the second supporting member is centered on four corners and one side of the fixing surface of the substrate. Although the case where the wide mold release part was formed and the adhesive fillet was formed in these mold release parts was demonstrated, this invention is not limited to this, but rather than the corresponding part of the fixed surface of a 2nd support member on a part of the fixed surface on a board | substrate. It can be used also when a mold release part with a large area is formed and an adhesive fillet is formed in this mold release part.

For example, as shown by the dashed-dotted line in FIG. 7, by forming cutting grooves 57 on each side wall of the lower pedestal 52, the four corners of the fixing surface 15 of the substrate 1 and the fixing surface of the lower pedestal 52 correspond to the center of each side. It can be used also when the mold release part which has an area larger than the part to form, and the adhesive fillet is formed in these mold release parts.

Alternatively, the cutting grooves 57 formed on one side wall of the lower pedestal 52 are omitted from the embodiment shown by the solid line in FIG. 7, and the release portions 16 to 16 are formed only at the four corners of the fixing surface 15 of the substrate 1 to form the adhesive fillets 62 to 62. It can be used also in the case of forming, or in the case where the four corners of the fixing surface of the pedestal have the same shape as the fixing surface of the substrate, and the release portion is formed only at the center of each side of the fixing surface of the substrate to form an adhesive fillet.

In the above embodiment, the support member is formed of the first support member (e.g. barrel) and the second support member (e.g. pedestal), and the focus of the lens is determined by the screwing amount of the first support member and the second support member. Although the camera module which can adjust the distance was demonstrated, this invention is not limited to this, For example, it can use also in the camera module which used what integrally formed the barrel and the base as a support member.

In the above embodiment, a camera module in which the elastic member has an engaging portion and a contact portion, and the engaging portion is coupled to and supported by the engaging step portion of the first support member has been described. However, the present invention is not limited thereto. It can also be used in the camera module which elastically deforms by screwing of the 1st support member and the 2nd support member, and enlarged the fastening force by screwing of the 1st support member and the 2nd support member by the elastic force.

For example, a camera in which the elastic member is an annular elastic body having a circular cross section (for example, an O-ring), and a part of the side of the first supporting member is coupled to the annular concave groove formed in the front end surface of the first supporting member when screwed. It can also be used in a module.

Or it can be used also for the camera module provided with the screw part and the annular elastic body part in which the 1st support member was integrally formed, and shape the screw part from the material with high rigidity, and shape | molded the annular elastic body part with the elastic material as an elastic member. In this case, only the screwing of the first support member and the second support member can automatically assemble the elastic member (annular elastic body portion) to simplify the assembly process.

In the above embodiment, the camera module in which the elastic member is inserted between the first support member and the second support member has been described. However, the present invention is not limited to this, but between the first support member and the second support member. It can also be used in a camera module (for example, the camera module which is the conventional example of FIG. 9) which does not insert an elastic member in the inside.

In the above embodiment, the camera module in which four recesses accommodating the photocurable adhesive are formed at equal intervals along the circumferential direction in the upper peripheral portion of the first support member has been described, but the present invention is not limited thereto. It is also possible to use a camera module having one concave portion accommodating a burn adhesive or a plurality of concave portions accommodating a photocurable adhesive and formed at the same or different intervals along the circumferential direction.

In the above embodiment, the camera module in which the recessed portion for accommodating the photocurable adhesive is formed in the first support member has been described. However, the present invention is not limited to this, and the recessed portion for accommodating the photocurable adhesive is applied to the second support member. It can also be used also in the camera module which provided the recessed part which accommodates the formed camera module or the photocurable adhesive agent in the 1st support member and the 2nd support member.

In the above embodiment, in order to increase the fixed area of the first support member and the second support member, a concave portion for accommodating the photocurable adhesive is extended to the screw coupling portion of the first and second support members. However, the present invention is not limited to this, and the present invention can also be used in the case of a camera module in which the recess for accommodating the photocurable adhesive does not extend to the screw engaging portions of the first support member and the second support member.

In the above embodiment, the case of the camera module in which the first and second support members are formed of a material that does not transmit light (for example, synthetic resin) has been described. However, the present invention is not limited thereto, It can be used also in the case of the camera module in which at least one of the 2nd support members was shape | molded by the light transmissive material.

In this case, since external light can be irradiated to the screw coupling portions of the first and second support members, the formation of the recess is omitted, and a photocurable adhesive is injected into the screw coupling portions so that the first support member and the second support member can be shortened. Can be fixed.

In the above embodiment, in order to increase the fixed strength of the first and second support members, a camera module in which a recess for accommodating the photocurable adhesive is formed over the first and second support members has been described. It is not limited to this, and the recessed part which accommodates a photocurable adhesive is abbreviate | omitted, and the camera module which injected the general-purpose adhesive agent into the space | interval (gap) of a screw coupling part, or the camera module which does not inject adhesive to the space | interval (gap) of a screw coupling part. It can also be used.

The invention of claim 1 is a camera module having a substrate and a supporting member, wherein a part of the fixing surface on the substrate is formed with a release portion having a larger area than the corresponding portion of the fixing surface of the supporting member, In addition to the adhesive layer for adhering the facing portion of the fixing surface of the supporting member, a continuous adhesive fillet is formed on the adhesive layer, and the adhesive fillet is a portion adjacent to the mold release portion of the fixing surface of the substrate and the sidewall of the supporting member. Since the bonding strength of the substrate and the supporting member can be increased without increasing the fixing surface of the substrate and the supporting member, the camera module can be miniaturized.

According to the invention of claim 2, in the invention of claim 1, the fixing surface of the substrate and the fixing surface of the supporting member are formed in a substantially square annular shape, and a release portion is formed in four corners of the fixing surface of the substrate. It is possible to stably increase the fixed strength without almost widening the fixed surface of the support member.

In the invention according to claim 3, in the invention according to claim 1 or 2, the support member is formed of the first support member and the second support member, and the fixing surface of the support member is fixed to the support member in the second support member. Since it is a surface, this invention can be utilized in the camera module which can adjust the focal length of a lens by the screwing amount of a 1st support member and a 2nd support member.

Claims (3)

A substrate 1 on which the photographing element 11 is installed, The support members 7 fixed on the substrate 1 by supporting the lenses 25 and 25 are Equipped with a camera module, The release part of which the area is larger than the corresponding part of the fixed surface 55 with the board | substrate 1 in the support member 7 in a part of the fixed surface 15 with the support member 7 on the board | substrate 1. Form 16, The adhesive layer 60 forms an adhesive layer 61 for adhering a portion of the fixing surface 15 of the substrate 1 to the facing surface of the fixing surface 55 of the support member 7 by the adhesive 60. 61 to form an adhesive fillet 62 for adhering the release portion 16 of the fixing surface 15 of the substrate 1 and the portion adjacent to the release portion 16 of the side wall of the support member 7 in succession to 61. Thing Camera module. The method of claim 1, The fixing surface 15 of the substrate 1 and the fixing surface 55 of the support member 7 are formed in a substantially square annular shape, and the four corners of the fixing surface 15 of the substrate 1 have a release portion ( 16) that is formed Camera module. The method according to claim 1 or 2, The supporting member 7 A first support member 2 on which the lenses 25 and 25 are supported, The first support member 2 is screwed with the second support member 5 fixed to the substrate 1 while supporting the first support member 2. Done, In the second supporting member 5, the fixing surface with the substrate 1 is the fixing surface 55 of the supporting member 7. Camera module.

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