CN115334215A

CN115334215A - Optical member driving device, camera device, and electronic apparatus

Info

Publication number: CN115334215A
Application number: CN202210146259.1A
Authority: CN
Inventors: 浅川新六
Original assignee: New Shicoh Motor Co Ltd
Current assignee: New Shicoh Motor Co Ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-11-11

Abstract

The invention provides an optical member driving device, a camera device and an electronic apparatus, wherein the shake of a rotating shaft of a movable part is less. The optical member driving device (3) includes: a holder (20) as a movable part for supporting the prism (2) as an optical member; a plate material (40) as a non-movable portion; and a support mechanism (30) for supporting the holder (20) relative to the plate (40) so as to be rotatable about the rotation axis. The support mechanism (30) has 2 sets of support portions (31 and 32), each set of support portions having balls (35 and 36) as convex portions fixed to the plate member (40) and plate springs (33 and 34) fixing both end portions (33 b, 33b and 34b, 34 b) to the holder (20) and having concave portions (33 a and 34 a) in central portions (33 c and 34 c) accommodating the balls (35 and 36). The 2 sets of support portions (31, 32) sandwich the holder (20) and are sandwiched between the holder (20) and the plate material (40).

Description

Optical member driving device, camera device, and electronic apparatus

Technical Field

The present invention relates to an optical member driving device, a camera device, and an electronic apparatus used for an electronic apparatus such as a smartphone.

Background

Among camera devices mounted on electronic devices such as smartphones are camera devices that: an optical member such as a lens body or a prism is disposed on an optical path from a subject to an image sensor, and an optical member driving device is provided for tilting the optical member about a predetermined rotation axis. As a document disclosing a technique related to such a camera device, there is patent document 1.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2020-177067.

Disclosure of Invention

(problems to be solved by the invention)

However, in the conventional camera device, the support shaft and the bearing are interposed between the movable portion supporting the optical member and the fixed portion, and the movable portion is rotatably supported with respect to the fixed portion. In this case, a clearance is necessarily required between the support shaft and the bearing, and therefore the rotation shaft may shake during use of the camera apparatus. In the related art, in order to prevent the wobbling of the rotating shaft, the support shaft and the bearing are pressed against each other by applying a lateral pressure. Further, when an impact is applied to the movable portion due to the fall of the camera device or the like, the impact is concentrated on the bearing and the support shaft, and therefore, it is necessary to increase the rigidity of the members constituting the support shaft and the bearing so that the rotational shaft does not shake in the rear, which causes a problem of increasing the member cost.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical member driving device, a camera device, and an electronic apparatus in which the amount of shake of the rotation axis of the movable portion is small.

(means for solving the problems)

In order to solve the above problem, an optical member driving device according to a preferred embodiment of the present invention includes: a movable portion supporting the optical member; an inactive portion; and a support mechanism for supporting the movable section relative to the non-movable section so as to be rotatable about a rotation axis, the support mechanism including 2 sets of support sections, each set of support sections including a convex surface portion fixed to one of the movable section and the non-movable section and a plate spring having both end portions fixed to the other of the movable section and the non-movable section and a concave surface portion in a central portion thereof for accommodating the convex surface portion, the 2 sets of support sections sandwiching the movable section therebetween and sandwiched between the movable section and the non-movable section.

In this aspect, the leaf spring may be curved convexly so that the central portion is raised relative to the other of the movable portion and the non-movable portion.

In addition, the movable portion may be pressed from both sides by the elastic force of the plate spring.

Further, the concave portion may be in non-contact with the other of the movable portion and the non-movable portion to which the leaf spring is fixed.

The one of the movable portion and the non-movable portion to which the convex surface portion is fixed may have a hole, and the convex surface portion may be fixed to the member so as to close the hole.

Further, the plate spring may be configured to be non-contact with the one of the movable portion and the non-movable portion to which the convex portion is fixed.

In addition, the method may further include: a fixed part; and a support shaft fixed to the fixing portion, the support shaft rotatably supporting the non-movable portion with respect to the fixing portion, the rotation shaft being parallel to a direction orthogonal to the support shaft.

A camera device according to another preferred embodiment of the present invention includes the optical member driving device.

An electronic device according to still another preferred embodiment of the present invention includes the above camera device.

(effect of the invention)

An optical member driving apparatus according to the present invention includes: a movable portion supporting the optical member; a non-movable section; and a support mechanism that supports the movable portion rotatably about a rotation axis with respect to the non-movable portion, the support mechanism including 2 sets of support portions, each set of support portions including a convex surface portion fixed to one of the movable portion or the non-movable portion and a plate spring having both end portions fixed to the other of the movable portion or the non-movable portion and a concave surface portion in a central portion thereof for accommodating the convex surface portion, the 2 sets of support portions sandwiching the movable portion and being sandwiched between the movable portion and the non-movable portion. A straight line passing through contact points of the two convex surface portions and the concave surface portion becomes a rotation axis. The concave and convex portions provided on the plate spring act to restore the original positional relationship even if the positional relationship is deviated. Therefore, the optical member driving device, the camera device, and the electronic apparatus can be provided in which the rotational axis of the movable portion is less likely to be shaken.

Drawings

Fig. 1 is a front view of a smartphone 9 equipped with a camera device 8 including an optical member driving device 3 according to an embodiment of the present invention.

Fig. 2 is a perspective view of the optical member driving device 3 of fig. 1.

Fig. 3 is a perspective view of the optical member driving device 3 with the housing 10 removed.

Fig. 4 is an exploded perspective view of fig. 2.

Fig. 5 is an exploded perspective view further illustrating portions of fig. 3.

Fig. 6 is a sectional view of the 1 st support part 31 taken along the longitudinal direction of the

leaf springs

33 and 34.

Fig. 7 is a sectional view of the periphery of the 1 st support part 31 of fig. 6 when a force in the-Y direction is applied to the prism 2.

Fig. 8 is a cross-sectional view of the optical member driving device 3 cut along the YZ plane passing through the 1 st support part 31 and the 2 nd support part 32.

Fig. 9 is a sectional view of the optical member driving device 3 of fig. 8 when a force in the-Z direction is applied to the prism 2.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in fig. 1, the camera apparatus 8 is housed in a housing of a smartphone 9.

The camera device 8 has: a prism 2 and a lens body 6 as optical members; an image sensor 7 that photoelectrically converts light guided from a photographic subject via the prism 2 and the lens body 6; and an optical member driving device 3 that drives the prism 2. Light incident on the prism 2 from the subject is bent by the prism 2, passes through the lens body 6, and then enters the image sensor 7.

The configuration of the present embodiment will be described below by setting an orthogonal coordinate system including X, Y, and Z axes orthogonal to each other. The X axis is an axis passing through the optical axis of the lens body 6. The X-axis and the Y-axis are axes orthogonal to each other and orthogonal to the Z-axis. Light from the subject of photographing enters the prism 2 from the Z-axis direction, is bent at a right angle by the prism 2, travels in the Z-axis direction, and passes through the lens body 6. Hereinafter, in the X-axis direction, the side where the prism 2 is viewed from the lens body 6 is referred to as the-X side, and the opposite side where the image sensor 7 is located is referred to as the + X side. In addition, in the Z-axis direction, the side of the photographic subject viewed from the prism 2 is referred to as + Z side, and the opposite side thereof is referred to as-Z side.

As shown in fig. 4, the optical member driving device 3 includes: a housing 10; a holder 20; a support mechanism 30 having a 1 st support part 31 and a 2 nd support part 32; a sheet material 40; and a base 50. Here, the housing 10 and the base 50 are fixed portions. The holder 20 is a movable portion that supports the prism 2 as an optical member. In the optical member driving device 3, a substantially rectangular parallelepiped housing is configured by combining the housing 10 and the base 50. The plate material 40 supporting the holder 20 is accommodated inside the frame body. In a housing having the case 10 and the base 50, the plate member 40 is rotatable about a rotation axis parallel to the Z axis. The plate material 40 is an immovable portion with respect to the holder 20 as a movable portion, and the holder 20 supported by the plate material 40 is rotatable about a rotation axis orthogonal to a plane including the rotation axis of the plate material 40. In the initial state, the rotation axis is rotatable about the rotation axis parallel to the Y axis.

As shown in fig. 2, the optical member driving device 3 has a substantially rectangular parallelepiped shape. As shown in fig. 4 and 5, the housing 10 is formed by bending a single sheet of plate-like metal member, and includes

side surface portions

11 and 12 on the-Y side and the + Y side of the optical member driving device 3 and a top surface portion 13 on the + Z side connecting these

side surface portions

11 and 12. The surfaces of the housing 10 on the + X side, the-Z side, and the + Z side other than the top surface portion 13 are open. A holder 20 that supports the prism 2 is accommodated in the housing 10. The incident surface of the prism 2 supported by the holder 20 is exposed from the opening portion on the + Z side of the housing 10, and the emission surface of the prism 2 is exposed from the opening portion on the + X side.

As shown in fig. 4 and 5, the base 50 has a base body 51 and an FPC (Flexible printed circuit) 52, and is substantially rectangular in shape as a whole.

The base main body 51 is formed by bending a single sheet of plate-like metal member, and has a bottom surface portion 51a on the-Z side, and a side surface portion 51b on the-X side and a side surface portion 51c on the + X side bent at right angles from the bottom surface portion 51 a. The case 10 is fitted into the surfaces of the opened + Y side, the-Y side, and the + Z side to form a frame. A hole 62 is formed in the bottom surface portion 51a at substantially the center in the Y axis direction, and a base end portion of a support shaft 61 made of metal is fixed to the hole 62 by caulking or welding. The side surface portion 51c is provided with an open portion 51d, and the emission surface of the prism 2 is exposed through the open portion on the + X side of the housing 10. Further, a yoke 77 is disposed on the-Z side surface of the bottom surface portion 51a, and a yoke 78 is disposed on the-X side surface of the side surface portion 51 b.

The FPC52 has a bottom surface portion 52a on the-Z side and a side surface portion 52b on the-X side bent at right angles from the bottom surface portion 52 a. A hole 63 is formed in the bottom surface portion 52a at a position corresponding to the hole 62.

Coils

71 and 72 are arranged side by side in the Y-axis direction on the + X side surface of side surface portion 52b. A hall IC73 is disposed on the inner peripheral side of the coil 71. The coil 75 is disposed on the + Z side surface of the bottom surface portion 52 a. A hall IC76 is disposed on the inner peripheral side of the coil 75. The FPC52 is inserted into the hole 63 of the bottom surface portion 52a of the base main body 51 through the support shaft 61 of the bottom surface portion 51a, and is accommodated in the base main body 51.

The plate member 40 is formed by bending a single plate-shaped metal member, and has a bottom surface portion 41 on the-Z side and

side surface portions

43 and 44 on the-Y side and the + Y side bent at right angles from the bottom surface portion 41. A hole 64 is formed in the bottom surface portion 41 at substantially the center in the Y axis direction. A proximal end portion of a hollow cylindrical bearing 65 is inserted and fixed into the hole 64. The support shaft 61 of the base 50 extends in the Z-axis direction and is inserted into the shaft hole of the bearing 65. Thereby, the plate material 40 can freely rotate around the support shaft 61 parallel to the Z axis.

Ball receiving holes

43a and 44a are formed in the

side surface portions

43 and 44 of the plate member 40. The line connecting the ball receiving hole 43a and the ball receiving hole 44a is parallel to the Y-axis, and the rotation axis of the holder 20 passes through the

ball receiving holes

43a and 44a.

The holder 20 has a substantially rectangular parallelepiped shape, and has a plane connecting the opposite corners of the-X + Z side and the + X-Z side, and a tilted part 23 on which the prism 2 is placed is formed on the + X + Z side. The holder 20 has

side surface portions

21 and 22 sandwiching the inclined portion 23 from both sides in the Y-axis direction, and the prism 2 is fixed by adhesion.

A support mechanism 30 having a 1 st support portion 31 and a 2 nd support portion 32 is interposed between the plate member 40 and the holder 20. The 1 st support part 31 has a ball 35 and a plate spring 33 as convex portions, and the 2 nd support part 32 has a ball 36 and a plate spring 34 as convex portions. The

balls

35 and 36 are spherical bodies made of a hard material such as metal or ceramic. The ball 35 is fixed to the + Y side surface of the side surface portion 43 of the plate 40 so as to close the ball receiving hole 43a, and the + Y side surface is convex. The ball 36 is fixed to the surface of the side surface portion 44 on the-Y side and on the-Y side so as to close the ball receiving hole 44a.

The leaf springs 33 and 34 are formed of a plate-shaped metal member having elasticity, and have

end portions

33b, 33b and 34b, 34b and

center portions

33c and 34c. The two

end portions

33b, 33b and 34b, 34b are formed on the same plane. In addition, positioning holes are respectively arranged. The

center portions

33c and 34c connect the two

end portions

33b and 34b in an arc shape.

Concave portions

33a and 34a recessed in the opposite direction to the arc are provided in the centers of the

center portions

33c and 34c. The

balls

35 and 36 are accommodated and abutted in the

concave portions

33a and 34a.

On the surface of the side surface portion 21 of the holder 20 on the-Y side, a recess for attaching the plate spring 33 is formed along the inclination of the inclined portion 23, a hole 24 for receiving the recess portion 33a is provided in the center of the recess, and positioning projections are provided on both ends. The side surface 22 of the holder 20 on the + Y side is also provided with a recess, a hole 25, and a positioning projection. The leaf springs 33 and 34 are positioned such that the positioning projections are inserted through the positioning holes and the

end portions

33b, 33b and 34b, 34b are fixed to the recesses. At this time, the

central portions

33c and 34c are formed and attached so as to be convexly curved so as to float with respect to the concave portion. The

concave portions

33a and 34a are recessed so as to exceed the convex curvature of the

central portions

33c and 34c, but the

central portions

33c and 34c of the

leaf springs

33 and 34 are accommodated in the

holes

24 and 25, and therefore the

central portions

33c and 34c of the

leaf springs

33 and 34 are not in contact with the retainer 20 including the

concave portions

33a and 34a. In this example, the

balls

35 and 36 are spherical bodies, but may have a hemispherical shape. The surface shape does not necessarily have to be a spherical surface, but may be a smooth curved surface. Similarly, the

concave portions

33a and 34a are concave spherical surfaces, but the surface shapes of the

concave portions

33a and 34a do not necessarily have to be spherical surfaces, and may be smooth curved surfaces. In the case of a spherical surface, the radii of the

concave portions

33a and 34a are equal to or larger than the radii of the

balls

35 and 36.

The retainer 20 to which the

leaf springs

33 and 34 are fixed is assembled to a plate material 40 to which the

balls

35 and 36 are fixed so that the

balls

35 and 36 are accommodated in the

concave portions

33a and 34a. At this time, the

central portions

33c and 34c of the

leaf springs

33 and 34 are deformed so as to be pressed toward the

side surface portions

21 and 22. That is, the holder 20 is pressed from both sides by the elastic force of the

leaf springs

33 and 34. Thus, the retainer 20 is supported by the plate member 40 via the 1 st support portion 31 and the 2 nd support portion 32, and can rotate about a straight line passing through a contact point between the ball 35 and the concave portion 33a and a contact point between the ball 36 and the concave portion 34a as a rotation axis. In the assembled state, the plate springs 33 and 34 are not in contact with the plate material 40.

In fig. 4 and 5, a magnet 81 is disposed on the surface of the holder 20 on the-X side so as to face the

coils

71 and 72. The magnet 81 and the

coils

71 and 72 constitute a driving unit that supplies a rotational driving force around a rotation axis parallel to the Z axis, specifically, around the support shaft 61 to the holder 20. The hall IC73 detects the rotational position of the holder 20 around the support shaft 61, and supplies a drive current for correcting the rotational position of the holder 20 to an appropriate position to the

coils

71 and 72. Further, the yoke 78 and the magnet 81 attract each other, and a force is applied to the holder 20 toward the side surface portion 51b side of the base main body 51 in the direction orthogonal to the support shaft 61 together with the plate material 40. In addition, it also functions as a magnetic spring to provide a force in the opposite direction for rotation about the support shaft 61.

A magnet 82 is disposed on the-Z side surface of the holder 20 so as to face the coil 75. The magnet 82 and the coil 75 constitute a driving portion that provides a rotational driving force around a rotation axis formed by the 1 st support portion 31 and the 2 nd support portion 32. The hall IC76 detects the rotational position of the holder 20 about the rotation axis, and supplies a drive current for correcting the rotational position of the holder 20 to an appropriate position to the coil 75. Further, the yoke 77 and the magnet 82 attract each other, and a force is applied to the holder 20 in a direction parallel to the support shaft 61, i.e., toward the bottom surface portion 51a of the base main body 51 together with the plate material 40. In addition, the first support portion 31 and the second support portion 32 function as a magnetic spring to provide a force in opposite directions for rotation around the rotation axis.

Fig. 6 and 7 show one function of the 1 st support part 31. Fig. 6 is a diagram of a normal state, and fig. 7 is a diagram of a state in which a force for moving the prism 2 in the-Y direction is applied. In fig. 6, as described above, the

end portions

33b and 33b of the plate spring 33 are fixed to the side surface portion 21 of the holder 20, and the balls 35 are fixed to the side surface portion 43 of the plate member 40. In a state where the ball 35 and the concave portion 33a are combined, the central portion 33c is pressed toward the side surface portion 21. The central portion 34c of the leaf spring 34 on the opposite side is also pressed toward the side surface portion 22 side, and a balance is achieved. In this state, the central portion 33c including the concave portion 33a does not contact the side surface portion 21 and the side surface portion 43.

As shown in fig. 7, when the prism 2 receives a force to move in the-Y direction, the central portion 33c is elastically deformed to reduce the amount of bending, and finally the concave portion 33a is completely accommodated in the hole 24, and the entire central portion 33c is in contact with the side surface portion 21 except for the hole 24. At this time, the central portion 34c of the leaf spring 34 on the opposite side is elastically deformed in a state where the concave portion 34a is kept in contact with the ball 36, so that the side surface portions 22 are separated. When the force disappears, the prism 2 returns to its original position due to the elastic force of the plate springs 33 and 34. Even if an impact is applied in this direction, the

leaf springs

33 and 34 elastically deform while being in contact with the

balls

35 and 36, and the impact is dispersed, so that the

leaf springs

33 and 34, the

balls

35 and 36, and the

side surface portions

21 and 22 fixing the

leaf springs

33 and 34 are less likely to be damaged by the impact. Therefore, the rotational shaft of the holder 20 is less likely to be shaken.

Fig. 8 and 9 show another function of the 1 st support part 31 and the 2 nd support part 32. Fig. 8 is a diagram in a normal state, and fig. 9 is a diagram in a state where a force for moving the prism 2 in the-Z direction is applied. The effect is the same for any direction of force of ZX.

The state in which no impact is applied to the prism 2, that is, the state shown in fig. 8 is the same as the state shown in fig. 6. At this time, the top of the ball 35 of the 1 st support part 31 contacts the deepest part of the concave part 33a, and the top of the ball 36 of the 2 nd support part 32 contacts the deepest part of the concave part 34a.

When a force for moving the prism 2 in the-Z direction is applied, as shown in fig. 9, the

concave portions

33a and 34a of the plate springs 33 and 34 move in the-Z direction so as to slide on the

balls

35 and 36, and the

central portions

33c and 34c elastically deform so as to allow the movement. When the force disappears, the prism 2 returns to its original position due to the elastic force of the plate springs 33 and 34. Even if an impact is applied in this direction, the

leaf springs

33 and 34 elastically deform while being in contact with the

balls

35 and 36, and the impact is dispersed, so that the

leaf springs

33 and 34, the

balls

35 and 36, and the

side surface portions

21 and 22 fixing the

leaf springs

The above is the details of the present embodiment. An optical member driving device 3 as one embodiment of the present invention includes: a holder 20 as a movable portion for supporting the prism 2 as an optical member; a plate material 40 as an inactive portion; and a support mechanism 30 for supporting the holder 20 to be rotatable about a rotation axis with respect to the plate member 40. The support mechanism 30 has 2 sets of

support portions

31 and 32, each having

balls

35 and 36 fixed to a convex portion of the plate material 40 and

leaf springs

33 and 34 fixing both

end portions

33b, 33b and 34b, 34b to the holder 20 and having

concave portions

33a and 34a in

central portions

33c and 34c accommodating the

balls

35 and 36. The 2 sets of

support portions

31, 32 sandwich the holder 20 and are sandwiched between the holder 20 and the plate member 40. With this configuration, a straight line passing through a contact point of the ball 35 and the concave portion 33a and a contact point of the ball 36 and the concave portion 34a becomes a rotation axis. The

concave portions

33a and 34a and the

balls

35 and 36 provided in the

leaf springs

33 and 34 act to restore the original positional relationship even if the positional relationship is deviated. Thus, the shake of the rotation shaft of the holder 20 is suppressed.

In the above embodiment, the

balls

35 and 36 are fixed to the plate material 40 and the plate springs 33 and 34 are fixed to the holder 20, but the

balls

35 and 36 may be fixed to the holder 20 and the plate springs 33 and 34 may be fixed to the plate material 40.

(description of reference numerals)

2, a prism; 3 an optical member driving device; 6 a lens body; 7 an image sensor; 8 a camera device; 9 a smart phone; 10 a shell; 11. 12, 21, 22, 43, 44, 51b, 51c, 52b side face portions; 41. 51a, 52a bottom surface parts; 13 a top surface portion; 20 a holder; 23 an inclined portion; 30 a support mechanism; 31 the 1 st support part; 32 nd support part 2; 33. 34 leaf springs; 33a, 34a concave portions; 33b, 34b ends; 33c, 34c center parts; 35. 36 balls; 24. 25, 62, 63, 64 holes; 40 of plates; 43a, 44a receive ball holes; 50 a base; 51a base body; 51d open part; 52FPC;61 supporting the shaft; 65 bearings; 77. 78 a magnetic yoke; 71. 72, 75 coils; 73. 76 Hall IC; 81. 82A magnet.

Claims

1. An optical member driving apparatus, comprising:

a movable portion supporting the optical member;

an inactive portion; and

a support mechanism for supporting the movable section so as to be rotatable about a rotation axis with respect to the non-movable section,

the support mechanism has 2 sets of support parts, each set of support parts has a convex surface part fixed on one of the movable part or the non-movable part and a plate spring with two end parts fixed on the other of the movable part or the non-movable part and a concave surface part for accommodating the convex surface part at the central part,

the 2 sets of support portions sandwich the movable portion and between the movable portion and the non-movable portion.

2. The optical member driving device according to claim 1, wherein:

the leaf spring is formed to be convexly curved so that a central portion floats with respect to the other of the movable portion or the non-movable portion.

3. The optical member driving device according to claim 1, wherein:

the movable portion is pressed from both sides by the elastic force of the plate spring.

4. The optical member driving device according to claim 1, wherein:

the concave portion is non-contact with the other of the movable portion or the non-movable portion to which the leaf spring is fixed.

5. The optical member driving device according to claim 1, wherein:

the one of the movable portion or the non-movable portion to which the convex surface portion is fixed has a hole, and the convex surface portion is fixed to the member so as to close the hole.

6. The optical member driving apparatus as claimed in claim 1, wherein:

the plate spring is in non-contact with the one of the movable portion and the non-movable portion to which the convex surface portion is fixed.

7. The optical member driving apparatus as claimed in claim 1, comprising:

a fixed part; and

a support shaft fixed to the fixing portion,

the support shaft rotatably supports the non-movable portion with respect to the fixed portion,

the rotation shaft is parallel to a direction orthogonal to the support shaft.

8. A camera device provided with the optical member driving device according to any one of claims 1 to 7.

9. An electronic device provided with the camera device according to claim 8.