CN112596320A

CN112596320A - Aperture driving device, camera device, and electronic apparatus

Info

Publication number: CN112596320A
Application number: CN202011039978.0A
Authority: CN
Inventors: 寺嶋厚吉
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Motor Co Ltd; New Shicoh Technology Co Ltd
Priority date: 2019-10-01
Filing date: 2020-09-28
Publication date: 2021-04-02
Also published as: JP2021056448A; CN213581690U

Abstract

Provided are an aperture stop driving device, a camera device and an electronic apparatus, which can realize miniaturization and thinning. An aperture stop driving device (10) comprises at least two or more sets of stop blades (18,20) parallel to a virtual circle when the virtual circle is designed around a reference axis with the optical axis of a lens as the reference axis, a base (12) for freely supporting the stop blades (18,20) in the radial direction of the virtual circle, and a driving unit (32,34) which comprises a shape memory alloy part (40) extending in the tangential direction of the virtual circle and drives the stop blades (18,20) by the deformation of the shape memory alloy part (40).

Description

Aperture driving device, camera device, and electronic apparatus

[ technical field ] A method for producing a semiconductor device

The invention relates to an aperture stop driving device, a camera device and an electronic apparatus.

[ background of the invention ]

Conventionally, as described in patent document 1, the aperture stop device has a structure in which a rotation shaft is rotated to linearly move a stop blade, and therefore, there is a problem in that a large torsion force is required to rotate the rotation shaft, and a structure for generating a large torsion force is also required to be large-sized.

[ patent document ]

[ patent document 1 ] Japanese patent application laid-open No. 2017-167186

[ summary of the invention ]

[ problem to be solved by the invention ]

The invention provides an aperture stop driving device, a camera device and an electronic device, which can realize miniaturization and thinning.

[ technical solution ] A

One aspect of the present invention is an aperture stop driving device including at least two sets of aperture blades parallel to a virtual circle when the virtual circle is disposed around a reference axis with an optical axis of a lens as the reference axis, a base for freely supporting the aperture blades in a radial direction of the virtual circle, and a driving unit including a shape memory alloy portion extending in a tangential direction of the virtual circle and driving the aperture blades by deformation of the shape memory alloy portion.

The driving assembly further includes a support member extending in parallel with the shape memory alloy portion, having elasticity, and supporting the shape memory alloy portion. The shape memory alloy portion may be disposed on one of an outer side and an inner side in a radial direction of an imaginary circle of the support portion, or on the outer side and the inner side. And the two ends of the shape memory alloy part are fixed on the supporting part. The shape memory alloy portion may also be supported on the support member by a mounting ring. A fastening part formed by fastening two ends of the supporting part on the base in a freely rotating manner

Furthermore, a holder for fixing the aperture blade may be provided. The bracket may be provided with a projection on which the drive assembly is pressed into contact when the drive assembly is deformed. Further, the center of the driving unit may be coupled to the bracket to drive the bracket.

The aperture blade may be one piece or may be formed by overlapping at least two pieces.

Another aspect of the present invention is a photographic apparatus having the aperture stop driving device. Further, the present invention may be applied not to an aperture stop driving device but to a driving device for driving a lens.

Further, another aspect of the present invention is an electronic apparatus having the above-described camera device.

[ Effect of the invention ]

According to the present invention, the diaphragm blades are driven by the driving unit including the shape memory alloy portion extending in the tangential direction of the reference circle, thereby achieving downsizing and thinning.

[ description of the drawings ]

Fig. 1 is an oblique view showing an aperture stop driving device according to a first embodiment of the present invention.

Fig. 2 is an exploded perspective view showing an aperture stop driving device according to a first embodiment of the present invention.

Fig. 3 is a plan view showing an aperture stop driving device according to a first embodiment of the present invention.

Fig. 4 is a perspective view showing a second diaphragm blade, a second holder, an aperture-enlarging driving unit, and an aperture-reducing driving unit used in the aperture stop driving device according to the first embodiment of the present invention.

Fig. 5 is an exploded perspective view showing an aperture enlarging drive unit used in the aperture stop driving device according to the first embodiment of the present invention.

Fig. 6A is a schematic view illustrating enlargement of the aperture stop driving device according to the first embodiment of the present invention.

Fig. 6B is a schematic diagram illustrating the reduction of the aperture stop driving device according to the first embodiment of the present invention.

Fig. 7 is an oblique view showing an aperture stop driving device according to a second embodiment of the present invention.

Fig. 8 is a plan view showing an aperture stop driving device according to a second embodiment of the present invention.

Fig. 9 is an oblique view showing a second diaphragm blade, a second holder, and a driving unit used in the aperture stop driving apparatus according to the second embodiment of the present invention.

Fig. 10 is an exploded perspective view showing a driving unit used in an aperture stop driving apparatus according to a second embodiment of the present invention.

Fig. 11 is an oblique view showing an aperture stop driving device according to a third embodiment of the present invention.

Fig. 12 is an exploded perspective view showing an aperture stop driving device according to a third embodiment of the present invention.

Fig. 13 is a plan view showing an aperture stop driving device according to a third embodiment of the present invention.

Fig. 14 is an oblique view showing a first diaphragm blade, a first holder, and a driving unit used in an aperture stop driving apparatus according to a third embodiment of the present invention.

[ notation ] to show

10-aperture diaphragm driving device

12 base station

14 base side opening part

16 guide groove

18 first aperture blade

20 second aperture blade

22 aperture side opening part

24 first support

26 second support

28 outer protrusion

30 inner side projection

32 opening part enlarging drive assembly (drive assembly)

34 drive unit for reducing opening part (drive unit)

36 mounting component

38 support member

40 shape memory alloy part

42 mounting component body part

44 annular component

46 is inserted into the hole

48 support member insertion groove

50 support member body portion

52 is tied and combined part

54 is a joint part

56 first shape memory alloy portion

58 second shape memory alloy portion

60 convex part

62 third diaphragm blade

64 third support

66 front side blade

68 rear side blade

[ detailed description ] embodiments

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 to 6 show a first embodiment of the present invention. The aperture stop driving device 10 according to the first embodiment of the present invention is a camera device that blocks and adjusts light to be incident on a lens, and a lens driving device is provided at a rear stage of the aperture stop driving device 10. In the description of the first embodiment, the optical axis of the lens is defined as a reference axis Z, and axes orthogonal to the reference axis Z are defined as X and Y axes.

The aperture stop driving device 10 has a base 12. Base 12 is a rectangular member extending in the XY direction, and is made of resin or the like. As shown in fig. 2, a base-side opening 14 is formed in the center of the base 12. The base-side opening 14 is circular, and as shown in fig. 3, the center of the base-side opening 14 communicates with a reference axis.

A guide groove 16 extending in the radial direction (Y-axis direction) of a virtual circle centered on the reference axis is formed on the surface of the base 12 on the + Z side. The guide groove 16 is fitted with a first diaphragm blade 18 and a second diaphragm blade 20 in a freely slidable manner. The guide groove 16 guides the first diaphragm blade 18 and the second diaphragm blade 20 to overlap each other in the Z direction.

The first diaphragm blade 18 and the second diaphragm blade 20 have V-shaped notches formed on the reference axis side, and the peripheries of the notches overlap in the Z direction. A quadrangular diaphragm-side opening 22 is formed by the V-cut portions of the first diaphragm blade 18 and the second diaphragm blade 20.

A rectangular first bracket 24 is fixed to the + Z side surface of the first diaphragm blade 18, and a rectangular second bracket 26 is fixed to the + Z side surface of the second diaphragm blade 20. The first bracket 24 and the second bracket 26 are received in the guide groove 16, and they can slide.

Outer protruding

portions

28,28 and inner protruding

portions

30,30 are formed on the ± Y-side ends of the + Z-side surfaces of the first holder 24 and the second holder 26, respectively, and extend in the X direction and protrude in the Z direction. The inner side surfaces of the outer protruding portion 28 and the inner protruding portion 30 face each other in the Y direction.

The first and

second holders

24, 26 are provided with opening-enlarging

drive units

32,32 and opening-reducing

drive units

34, 34. The opening-enlarging drive unit 32 and the opening-reducing drive unit 34 may be simply referred to as

drive units

32, 34.

The

drive assemblies

32,34 are mounted in the Y direction only in the opposite direction and are identical in construction. The

drive assemblies

32,34 are shown in fig. 5 as being comprised of a support portion comprised of a mounting member 36 and a support member 38, and a shape memory alloy portion 40. The mounting member 36, the support member 38, and the shape memory alloy portion 40 all extend in the X direction.

The mounting member 36 is made of resin or the like, and has a linear mounting member main body 42, and in this embodiment, a plurality of 5 ring members 44 are formed on the Y-direction side surface of the mounting member main body 42 at a predetermined distance from one end to the other end. Insertion holes 46 that open in the X direction are formed in the ring member 44. The shape memory alloy portion 40 formed in a round bar shape is inserted into the insertion hole 46.

A support member insertion groove 48 is formed in the mounting member main body portion 42 of the mounting member 36 so as to penetrate in the X direction. The support member body portion 50 of the support member 38 is embedded in the support member insertion groove 48. The support member 38 is made of a material having elasticity such as phosphor bronze. The support member 38 is bent linearly in the Y direction at both ends of the support member main body 50, and engaged

portions

52,52 are formed so as to be bent in a semicircular shape in the opposite direction. The engaged

portions

52,52 are rotatably engaged with engaging portions 54,54 (shown in fig. 2) formed to protrude from the + Z surface of the base 12.

The shape memory alloy portion 40 is made of a shape memory alloy, such as nickel titanium or copper zinc aluminum, and returns to its original shape when a certain temperature or higher is reached. In this embodiment, the ring members 44 at both ends are restrained to fix their positions, and the other ring members 44 are fitted so that the shape memory alloy portion 40 is not separated from the mounting member 36. The shape memory alloy portion 40 is shorter in original shape than the illustrated shape, and when the shape memory alloy portion 40 reaches a certain temperature or higher, the shape memory alloy portion 40 deforms and contracts. In this embodiment, when an electric current is applied to the shape memory alloy portion 40, the length thereof is shortened by joule heat generated by the electric current flowing therethrough. Once the length of the shape memory alloy portion 40 is shortened, the

drive members

32,34 are deformed into a convex bow shape on the mounting member 36 side against the elasticity of the mounting member body portion 42 and the support member 50.

The mounting members 36 of the opening-enlarging

drive units

32,32 face the Y-direction inner surfaces of the

outer protrusions

28, 28. The mounting members 36 of the opening-narrowing

drive units

34,34 face the Y-direction inner side surfaces of the

inner protrusions

30, 30.

Next, the operation of the first embodiment will be described.

The situation of enlarging the opening diameter is shown in fig. 6A.

When the shape memory alloy portion 40 of the opening-enlarging

drive unit

32,32 is energized, the opening-enlarging

drive unit

32,32 is bent outward in the radial direction of the imaginary circle as shown in a state a1 in fig. a. The central portion of the attachment member 36 presses the outer

side protruding portions

28,28 to the outside, and pushes the first diaphragm blade 18 and the second diaphragm blade 20 outward against frictional force generated between the bases 12. In this case, as shown in a state a2 of fig. 6A, the movement is stopped when the contact is made with the opening-reducing

drive units

34,34 in which the

inner protrusions

30,30 are not deformed.

When the energization of the shape memory alloy portion 40 of the aperture-enlarging

driving unit

32,32 is stopped, the aperture-enlarging

driving unit

32,32 returns to the linear state, but the first diaphragm blade 18 and the second diaphragm blade 20 stay at the stopped positions together with the first holder 24 and the second holder 26, respectively, and the diaphragm diameter is maintained in the enlarged state.

The situation where the diameter of the opening is reduced is shown in fig. 6B.

When the shape memory alloy portion 40 of the opening

reduction drive units

34,34 is energized, the opening

reduction drive units

34,34 are bent inward in the radial direction of the imaginary circle as shown in state B1 of fig. 6B. The central portion of the mounting member 36 presses the

inner protrusions

30,30 inward, and pushes the first and

second diaphragm blades

18,20 inward against frictional force generated between the bases 12. In this case, as shown in a state B2 of fig. 6B, the movement is stopped when the opening-enlarging

drive unit

32 or 32 is in contact with the

outer side projections

28 or 28, which are not deformed.

When the energization of the shape memory alloy portion 40 of the aperture-reducing

drive units

34,34 is stopped, the aperture-expanding

drive units

34,34 are returned to the linear state, but the first diaphragm blade 18 and the second diaphragm blade 20 stay at the stop positions together with the first holder 24 and the second holder 26, respectively, and the diaphragm diameter is maintained in the reduced state.

Therefore, according to the first embodiment of the present invention, it is possible to provide an aperture stop driving device having a simple structure capable of setting a state in which the aperture stop diameter is large and a state in which the aperture stop diameter is small (two states of a small F value and a large F value), and capable of achieving downsizing and thinning.

Fig. 7 to 10 show an aperture stop driving device 10 according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in the structure of the drive assembly and the mounting position thereof.

The driving

units

32,32 are used for both the opening portion enlarging purpose and the opening portion reducing purpose, and as shown in fig. 10, the support portion is composed of a support member 38 used for both the mounting member 36 and the support member 38 of the first embodiment. A first shape memory alloy portion 56 and a second shape memory alloy portion 58 are provided on both sides of the support member 38 in the Y direction. The support member 38 is made of a member having elasticity such as phosphor bronze, and 5 ring members 44 made of an insulating material such as resin are formed on both side surfaces of the support member main body portion 50 of the support member 38 in the Y direction at a predetermined distance from one end to the other end. A first shape memory alloy portion 56 and a second shape memory alloy portion 58 formed in a round bar shape are inserted into the insertion hole 46. The first shape memory alloy portion 56 and the second shape memory alloy portion 58 are bound by the ring member 44 located at both ends in the X direction.

The support member 38 is curved in a semicircular shape in the Y direction at both ends of the support member main body 50, and the distal ends thereof form columnar engaged

portions

52, 52. The engaged

portions

52,52 are rotatably engaged with

engaging portions

54,54 formed to protrude from the + Z surface of the base 12.

The first shape memory alloy portion 56 of the driving unit 32 is disposed on the Y-direction inner side, and the second shape memory alloy portion 58 is disposed on the Y-direction outer side. Further, the first holder 24 and the second holder 26 are formed with a projection 60 projecting in the Y direction. The ring member 44 located at the center in the X direction is coupled to the convex portion 60 from the inner side in the Y direction.

In the illustrated configuration, when a current is applied between the end portions of the first shape-memory alloy portion 56, the first shape-memory alloy portion 56 contracts by a predetermined amount in the longitudinal direction according to the temperature increase amount caused by the current application. The second shape memory alloy portion 58 and the support member 38 do not contract, and therefore the drive assembly 32 is curved in an arcuate shape with the second shape memory alloy portion 58 side being convex. When a current is applied between the ends of the second shape memory alloy portion 58, the second shape memory alloy portion 58 contracts by a predetermined amount in the longitudinal direction according to the temperature increase amount caused by the current application. The first shape memory alloy portion 56 and the support member 38 do not contract, and therefore the drive assembly 32 is curved in an arcuate shape with the first shape memory alloy portion 56 side being convex.

That is, upon energizing the first shape memory alloy portion 56, the drive assembly 32 flexes outwardly, and the central annular member 44 pulls the

projections

60,60 of the first and

second brackets

24, 26 outwardly. The first diaphragm blade 18 moves outward against frictional force generated between the first diaphragm blade 18 and the first bracket 24, and the base 12, and the second diaphragm blade 20 moves outward against frictional force generated between the second diaphragm blade 20 and the second bracket 26, and the base 12. The aperture 22 is expanded to a position where the contraction force of the first shape memory alloy portion 56 and the restoring force with respect to the bending deflection of the support member 38 and the second shape memory alloy portion 58 are balanced.

When the energization of the first shape memory alloy portion 56 is stopped, the first shape memory alloy portion 56 returns to the length before contraction, the driving unit 32 is brought into the linear state, and the diaphragm-side opening 22 returns to the initial state.

On the other hand, upon energizing the second shape memory alloy portion 58, the drive assembly 32 flexes inwardly and the central annular member 44 pushes the

projections

60,60 of the first and

second brackets

24, 26 inwardly. The first diaphragm blade 18 moves inward against the frictional force generated between the first diaphragm blade 18 and the first bracket 24 and the base 12, and the second diaphragm blade 20 moves inward against the frictional force generated between the second diaphragm blade 20 and the second bracket 26 and the base 12. The aperture 22 is expanded to a position where the contraction force of the second shape memory alloy portion 58 and the restoring force with respect to the bending deflection of the support member 38 and the first shape memory alloy portion 56 are balanced.

Then, once the energization of the second shape memory alloy portion 58 is stopped, the second shape memory alloy portion 58 returns to the length before contraction, the driving unit 32 becomes the linear state, and the diaphragm-side opening portion 22 returns to the initial state.

Therefore, according to the second embodiment of the present invention, it is possible to provide an aperture stop driving device having a simple structure that can arbitrarily set the size of the aperture stop diameter (arbitrary diameter of a section from the F value small to the F value large) and can realize miniaturization and thinning.

Fig. 11 to 14 show an aperture stop driving device 10 according to a third embodiment of the present invention. The third embodiment is the same as the drive unit 32 of the second embodiment, but differs from the second embodiment in the sliding direction of the diaphragm blades, the number of diaphragm blades, and the configuration of the diaphragm blades, and forms a hexagonal aperture portion on the diaphragm side.

In the third embodiment, the reference axis is Z, and 3 directions forming an angle of 120 degrees with each other perpendicular to Z are P, Q, and R. The driving assembly 32 is coupled to the first, second, and

third brackets

24, 26, and 64 fixed to the first, second, and

third diaphragm blades

18,20, and 62. The driving unit 32 including the first shape memory alloy portion 56 and the second shape memory alloy portion 58 slides the first diaphragm blade 18, the second diaphragm blade 20, and the third diaphragm blade 62 in the P, Q, R directions, respectively.

Also, the first, second, and

third diaphragm blades

18,20, and 62 are composed of both the front-side blade 66 and the rear-side blade 68 overlapping.

The front blade 66 and the rear blade 68 are overlapped in the Z direction, and form two sides of the hexagonal V shape of the diaphragm-side opening 22.

The front side blades 66 of the first diaphragm blade 18, the diaphragm blade 20, and the third diaphragm blade 62 are disposed so as to be located on the front sides of the rear side blades 68 of the adjacent diaphragm blades 18 to 20, respectively.

In the first and second embodiments, the two sides of the V-shape are formed on 1 plate material by machining and etching. For this reason, the opening corner portion of the V remains somewhat rounded. If the presence of the circle is to be avoided, two overlapping leaves of the third embodiment are used.

Further, when it is necessary to set the set value of the aperture area of the diaphragm-side opening portion 22 to a small value, a part of the front-side blades 66 and the rear-side blades 68 may be cut off so as to avoid interference between the blades.

Therefore, according to the third embodiment of the present invention, it is possible to provide an aperture stop driving device having a simple structure that can arbitrarily set the size of the aperture stop diameter (arbitrary diameter of a section from the F value small to the F value large) and can realize miniaturization and thinning.

In the embodiment, an example in which the present invention is applied to an aperture stop driving device is described, but this description can be applied to a lens driving device. That is, instead of the diaphragm blades, a lens holding portion for supporting the lens is provided on the mover, and the mover is driven by a drive unit having the shape memory alloy portion. Further, although the description is given of the aperture stop driving device, the description is also applicable to a camera device using the aperture stop device, and even an electronic apparatus having the camera device.

Claims

1. An aperture stop driving device, comprising

At least two sets of diaphragm blades parallel to a virtual circle when the virtual circle is set around the reference axis with the optical axis of the lens as the reference axis,

A base for freely supporting the diaphragm blades in the radial direction of the imaginary circle,

And a driving unit including a shape memory alloy portion extending in a tangential direction of the imaginary circle and driving the diaphragm blades by deformation of the shape memory alloy portion.

2. The aperture stop driving device according to claim 1, wherein the driving assembly further comprises a support portion extending in parallel with the shape memory alloy portion, having elasticity, and supporting the shape memory alloy portion.

3. The aperture stop driving device according to claim 2, wherein the shape memory alloy portion is disposed on one of an outer side and an inner side in a radial direction of the imaginary circle of the support portion, or on the outer side and the inner side.

4. The aperture stop driving device as claimed in claim 3, wherein said shape memory alloy portion is fixed at both ends thereof to said supporting portion.

5. The aperture stop driving device according to claim 2, wherein the support portion has a plurality of annular members into which the shape memory alloy portion is inserted.

6. The aperture stop driving device according to claim 2, wherein both ends of the support portion are tied to tie portions formed on the base in a freely rotatable manner.

7. The aperture stop driving device according to claim 1, further comprising a holder freely movable in a radial direction of the base, the stop blade being fixed to the holder.

8. The aperture stop driving device according to claim 7, wherein the holder has a projection on which the driving member is press-contacted when the driving member is deformed.

9. The aperture stop driving device as claimed in claim 7, wherein the center of said driving unit is coupled to said frame.

10. The aperture stop driving device according to claim 1, wherein the stop blade is formed by overlapping at least two pieces in the reference axis direction.

11. A camera device, characterized in that it comprises an aperture stop according to one of claims 1 to 10.

12. A photographic apparatus, comprising

A lens,

A base for movably supporting a mover, the mover having a lens supporting part for supporting the lens,

And a driving unit having a shape memory alloy portion extending in a direction orthogonal to a moving direction of the mover and driving the mover by deformation of the shape memory alloy portion.

13. An electronic device characterized by comprising the camera apparatus according to claim 11 or 12.