CN112946969B

CN112946969B - Optical component drive device, camera device, and electronic apparatus

Info

Publication number: CN112946969B
Application number: CN201911163605.1A
Authority: CN
Inventors: 赤津政宏
Original assignee: New Shicoh Motor Co Ltd
Current assignee: New Shicoh Motor Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2022-12-06
Anticipated expiration: 2039-11-25
Also published as: CN115755426A; CN112946969A

Abstract

The invention provides an optical component driving device, a camera device and an electronic device, wherein the optical component driving device is composed of an insulating material with strong bonding strength with an adhesive. The OIS lens driving device (1) is provided with a base (2), a metal sub-base (3) fixed on the base (2), a metal lower plate (4) fixed on the sub-base (3), an upper plate (6) sliding on the lower plate (4), and 4 SMA wires (7) of which both ends are fixed on a winding hook part (48) of the lower plate (4) and a winding hook part (68) of the upper plate (6), wherein the sub-base (3) is provided with 3 main bodies of the metal sub-base and a polyimide resin layer (30) formed in a manner of covering the upper surfaces of the 3 main bodies of the sub-base.

Description

Optical member driving device, camera device, and electronic apparatus

Technical Field

The present invention relates to an optical component driving device, a camera device, and an electronic device used in an electronic device such as a smartphone.

Background

Some camera apparatuses having an OIS (Optical Image Stabilizer) function include a camera apparatus in which an SMA (Shape Memory Alloy) wire is disposed between a movable member holding an Optical member and a support structure holding an Image pickup element, and the movable member and the support structure are relatively moved by contraction of the SMA wire. As a document disclosing a technique related to such a camera device, there is patent document 1. The camera device described in patent document 1 includes a movable member having a plate-like spring plate, and a support structure in which a support member and a conductive plate are laminated on a base. The movable member and the support structure are disposed opposite to each other with the bearing interposed therebetween, the spring plate and the conductive plate have hook portions at diagonally intersecting corners, respectively, and an SMA wire is laid between the hook portions of the spring plate and the hook portions of the conductive plate. When the SMA wire contracts, the movable member slides on the bearing relative to the support structure.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] International publication No. WO2019/086855A

Disclosure of Invention

[ problem to be solved by the invention ]

However, in the technique of patent document 1, an electrical insulating layer for insulating from a conductive plate on a supporting member is formed by Parylene (Parylene) which is one of high molecular compounds. However, it cannot be said that the adhesive strength of the support member, the adhesive for bonding the conductive plate, and the parylene is sufficiently strong.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical component driving device, a camera device, and an electronic apparatus, each of which is made of an insulating material having high adhesive strength with an adhesive.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

In order to solve the above problem, an optical component driving device according to a preferred embodiment of the present invention includes: a sub-base; a metal lower plate fixed to the sub-base; an upper plate sliding on the lower plate; and a plurality of SMA wire rods having both ends fixed to the lower plate and the upper plate, wherein the sub-base includes a metal sub-base body and a polyimide resin layer formed so as to cover an upper surface of the sub-base body.

In this embodiment, the polyimide resin layer may be formed by electrodeposition coating.

As another preferred embodiment of the present invention, a camera device is provided with the optical member driving device.

A camera device according to another preferred embodiment of the present invention includes the above camera device.

[ Effect of the invention ]

In the optical component driving device of the present invention, the metal sub base body is covered with the polyimide resin layer. Therefore, when the lower plate is adhesively fixed to the sub-base, the polyimide resin layer has insulation properties and has high adhesive strength with the adhesive. Therefore, it is possible to provide an optical component driving device, a camera device, and an electronic apparatus, each of which is made of an insulating material having a high adhesive strength with an adhesive.

Drawings

Fig. 1 is a front view of a smartphone 99 as an electronic device equipped with a camera device 10.

Fig. 2 is a perspective view of the OIS lens driving apparatus 1 of fig. 1.

Fig. 3 is a perspective view of a layered body of the sub base 3 and the lower plate 4 of the OIS lens driving apparatus 1 of fig. 2.

FIG. 4 is a drawing showing a plate for a pull-up test used in an effect confirmation test of the present invention.

Fig. 5 is a bar-like curve of the peel strength per unit area of the insulator recorded in the experiment for confirming the effect of the present invention.

FIG. 6 is a photograph showing the peeled surfaces of a parylene plate and a SUS304 stainless steel plate used in the experiment for confirming the effect of the present invention.

Fig. 7 is a photograph of peeled surfaces of a PET laminate and a SUS304 stainless steel plate used in the effect confirmation experiment of the present invention.

FIG. 8 is a photograph of the peeled surfaces of a PI spray plate and a SUS304 stainless steel plate used in the experiment for confirming the effect of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. As shown in fig. 1, the camera device 10 is housed in a housing of a smartphone 99. The camera device 10 includes: a lens body 11 as an optical member; an image sensor 12 that photoelectrically converts light incident from a subject via a lens body 11; an AF (auto focus) actuator 13 that drives the lens body 11 in the optical axis direction; and an OIS lens driving apparatus 1 that drives the AF actuator 13 in a plane orthogonal to the optical axis.

Hereinafter, a side of the lens body 11 where the optical axis is located on the object may be referred to as an upper side, and a side opposite to the object where the image sensor 12 is provided may be referred to as a lower side.

As shown in fig. 2, the OIS lens driving apparatus 1 includes: a metal base 2; a metal sub-base 3 fixed to the base 2; a metal lower plate 4 fixed to the sub-base 3; a plurality of sliding members 5 provided on the sub base 3; an upper plate 6 facing the lower plate 4 and sliding on the sliding member 5; both ends of the 4 SMA wires 7 are fixed to the

hook portions

48 and 68 provided on the lower and upper plates 4 and 6, respectively.

Among the above, the base 2, the sub-base 3, the lower plate 4, and the slide member 5 form a fixed portion, and the upper plate 6 forms a movable portion that moves relative to the fixed portion. The respective parts are configured as follows.

The base 2 has a thin square shape having a through hole 27 at the center. A part of one end edge of the base 2 is slightly notched to enable the AF actuator 13 to be electrically connected to the outside therefrom.

The sub-base 3 has a thin square shape having a through hole 37 at the center. The upper surfaces of the sub-base 3 bodies are covered with a polyimide resin layer 30 as an insulating material. The entire surface of the sub-base 3 main bodies may be covered with the polyimide resin layer 30. The sub base 3 is provided with sliding member attaching portions 31 at 4 locations surrounding the through-hole 37. The lower surface of the sub-base 3 is fixed by adhesion to the upper surface of the base 2.

The lower plate 4 is configured to include six plates 40-j (j =1 to 6). As shown in fig. 3, the lower plate 4 as a whole has a hole shape corresponding to the through-hole 37 and a square shape corresponding to the outer shape of the sub-base 3. The lower surface of the lower plate 4 is bonded and fixed to the upper surface of the sub-mount 3. The six plates 40-j (j =1 to 6) are arranged with a space therebetween. The six plate pieces 40-j (j =1 to 6) are insulated from the 3 main bodies of the metal sub base by the polyimide resin layer 30 of the sub base 3.

Of the plates 40-j (j =1 to 6), one end of each of the plates 40-1 to 40-5 extends downward from the end edge of the sub-base 3 to form a terminal. In addition, the other end portions of the sheet pieces 40-2 to 40-5 form hook portions 48. Two of the hook portions 48 are provided at 2 corners of a predetermined diagonal.

Notches 45 are provided in the lower plate 4 at positions of the plates 40-3, 40-4, and 40-6 corresponding to the slide member attaching portions 31, and the slide member attaching portions 31 are exposed to the upper side through the notches 45. The lower surface of the sliding member 5 is bonded and fixed to the sliding member mounting portion 31. The lower surface of the slide member 5 is flat, but a part of the upper surface is raised, and the upper plate 6 abuts against and slides on the part.

The upper plate 6 has: a substantially square body portion 60 having a through hole 67 at the center; and 2 arm portions 65 extending outward along the end edges from the 2 opposite end edges. Each arm 65 extends from the end edge around a diagonally chamfered corner outwardly and further along the adjacent end edge. The upper plate 6 is provided at the corner of the other diagonal with a connecting

piece

61, and 2 hook portions 68 are provided at the tip of the connecting piece 61. The hook portion 68 may be provided directly to the upper plate 6.

The hook portions 68 of the upper plate 6 and the hook portions 48 of the lower plate 4 form four corners of a square, and the upper plate 6 and the lower plate 4 overlap with the slide member 5 interposed therebetween. The front end of the wrist portion 65 is fixed to and electrically connected to the plate 40-1 and the plate 40-6, respectively.

One end and the other end of the SMA wire 7 are caulked and fixed to the hook portion 68 of the upper plate 6 and the hook portion 48 of the lower plate 4. When an electric current is supplied to the SMA wires 7, the SMA wires 7 contract by heat generation due to energization. The upper plate 6 of the movable portion slides on the slide member 5 by contraction of the SMA wire 7 and moves relative to the fixed portion.

Here, there are roughly two methods for forming the sub-mount 3. 1 is a method of forming the polyimide resin layer 30 by electrodeposition paint after forming the sub base 3 body shape. In this case, in the step of forming the shape of the thin sub base 3 main body, there is press working or etching working. The press working is advantageous in terms of cost, and the etching working is advantageous in terms of working accuracy. The polyimide resin layer 30 is formed on both sides. Another method is a method in which the polyimide resin layer 30 is formed on a thin plate before the shape of the sub base 3 main body is formed, and then the shape of the sub base 3 is formed by press working. In this case, etching cannot be used. In addition, a spray coating method or a lamination method may be used for forming the polyimide resin layer 30, and the polyimide resin layer 30 may be formed on one surface or both surfaces.

The above is the details of the configuration of the present embodiment. In the OIS lens driving apparatus 1 as the optical component driving apparatus according to the present embodiment, the main body of the metal sub base 3 is covered with the polyimide resin layer 30. Therefore, when the lower plate 4 is bonded and fixed to the sub-base 3, the polyimide resin layer 30 has insulation properties and has high adhesive strength with an adhesive. Therefore, it is possible to provide an optical component driving device, a camera device, and an electronic apparatus, each of which is made of an insulating material having high adhesive strength with an adhesive.

Here, the inventors of the present application conducted the following experiment in order to confirm how much the adhesive strength between the lower plate 4 and the sub-base 3 is improved by polyimide as the insulating material of the surface of the main body of the sub-base 3. The inventors selected the following materials a1 and b1 as insulating materials not including polyimide, and selected the following materials c1 and d1 as insulating materials including polyimide.

a1. Poly (p-xylylene)

Here, in patent document 1, which is a material used as an electric insulating layer for insulating a support member and an electric conductive plate, parylene is formed on a surface of a plate 91 as an experimental piece.

b1.PET lamination

This is obtained by forming polyethylene terephthalate (polyethylene terephthalate) on the surface of the sheet 91 by a lamination method.

PI spraying

Which is obtained by forming polyimide on the surface of the plate 91 by spraying.

PI lamination

Which is obtained by forming polyimide on the surface of the sheet 91 by a lamination method.

As shown in fig. 4, the inventors overlapped a plate 91 having materials a1, b1, c1, and d1 formed on the surface thereof with a part of a SUS304 stainless steel plate 92, which is a material used for the actual lower plate 4, and adhered the overlapped portion 93 with an adhesive used for the actual production to obtain a plate for the pull-up test. On the basis of this, the plate for the pull-up test of the materials a1, b1, c1 and d1 was subjected to five pull-up tests by using a pull-up shear tester, and the peel strength (N/cm) per unit area was recorded. The results are shown in the following table. Fig. 5 shows bar-like curves of the peel strength per unit area of the materials a1, b1, and c1.

[ TABLE 1 ]

The symbol "-" in the respective tables indicates that the peel strength per unit area could not be obtained because the peel strength measurement failed.

From the above table and the recorded results of fig. 5, it is understood that the adhesion strength per unit area of the laminate of parylene and PET is approximately the same, but the adhesion strength per unit area of PI spray is less than 2 times that of the laminate of parylene and PET.

In addition, the inventors of the present invention observed which of parylene, PET laminate, and PI spray plate and SUS304 stainless steel plate had adhesive left after peeling the plate for the pull-up test in the pull-up test, and imaged the peeled surface of the plate. Fig. 6, 7, and 8 are photographs of the release surface of the parylene, PET laminate, and PI spray from the first to fifth pull-up experiments.

From the photographs of fig. 6, 7, and 8, all the adhesive remained on one side of the SUS304 stainless steel plate in the lamination of parylene and PET. That is, the adhesive strength of the parylene and PET laminates with the adhesive was weaker than that of SUS304 stainless steel and the adhesive in all 5 times.

In contrast, in the PI spray, almost all of the adhesive remains on the side of the spray plate on which the polyimide was sprayed. That is, the adhesive strength of the PI spray and the adhesive was stronger than that of SUS304 stainless steel and the adhesive in all 5 times.

Thus, the peel strength shown in the peel strength of the parylene and PET laminates of table 1 represents the peel strength of the parylene and PET laminates and the adhesive. However, the peel strength of the PI spray (and PI lamination) does not indicate the peel strength of the PI spray (and PI lamination) and the adhesive, but indicates the peel strength of SUS304 stainless steel and the adhesive. That is, the peel strength of the actual PI spray (and PI laminate) and adhesive is still greater than the numbers in table 1.

From the above experimental results, it was confirmed that when the insulating material on the surface of the main body of the sub-base 3 is polyimide, the adhesive strength with the adhesive is improved to such an extent that it is parylene or PET, or compared with it, it is improved to such an extent that it is peeled off before being adhered to SUS304 stainless steel having a strong adhesive strength.

[ description of reference ]

1OIS lens drive; 2, a base; 3 pairs of bases; 4 a lower plate; 5a sliding member; 6 an upper plate; 7, SMA wire rods; 10 a camera device; 11 a lens body; 12 an image sensor; 13AF actuator; 27. 37, 67 through the hole; 30 a polyimide resin layer; 31 a sliding member mounting portion; 40-1, 40-2, 40-3, 40-4, 40-5 and 40-6 plates; 45, cutting; 48. 68 a hook portion; 60 a body portion; 61 connecting sheets; 65 wrist part; 99 smart phones.

Claims

1. An optical component driving device is characterized by comprising:

a sub base having a square shape with a through hole at the center and a plurality of slide members fixed to the slide member mounting portion;

a lower plate made of metal, having a hole shape corresponding to the through hole of the sub base and a square shape corresponding to the outer shape of the sub base as a whole, including a plurality of plate pieces, and fixed to the upper surface of the sub base by an adhesive;

a square-shaped upper plate having a through hole at the center thereof, 2 arm portions electrically connected to the 2 plate pieces of the lower plate, and sliding on the lower plate with the plurality of sliding members interposed therebetween; and

a plurality of SMA wires, both ends of which are fixed to a hook portion of a plate piece in the lower plate and a hook portion in the upper plate, and which move the upper plate with the slide member interposed therebetween,

the hook portions of the sheet pieces of the lower plate are formed one on each of the sheet pieces and two at 2 corners of one diagonal in the lower plate, and the hook portions of the sheet pieces of the upper plate are formed two at 2 corners of the other diagonal in the upper plate, so that the hook portions of the sheet pieces of the lower plate and the hook portions of the sheet pieces of the upper plate are provided at four corners of the square shape,

the sub base includes a sub base body made of metal and a polyimide resin layer formed so as to cover an upper surface of the sub base body,

any of the plate pieces of the lower plate provided with a hook portion extends from a corner portion of the square shape provided with the hook portion toward a terminal of the plate piece to at least a center of a side portion of the square shape, and is fixed to an upper surface of the sub-base,

when the lower surface of the lower plate and the upper surface of the sub base body fixed by the adhesive are peeled off, peeling occurs between the adhesive remaining on the upper surface of the sub base body and the lower surface of the lower plate, and the peel strength per unit area is improved by the polyimide resin layer.

2. Optical component driving apparatus according to claim 1,

the polyimide resin layer is formed by electroplating coating.

3. A camera device comprising the optical member driving device according to claim 1 or 2.

4. An electronic device comprising the camera device according to claim 3.