Aperture drive device, camera device and electronic equipment

Abstract

Provided are an aperture diaphragm drive device, a camera device and an electronic device that can be miniaturized and thinned. The aperture diaphragm drive device (10) comprises at least two groups of aperture blades (18, 20) parallel to an imaginary circle designed around the optical axis of a lens as a reference axis, a base (12) that freely supports the aperture blades (18, 20) in the radial direction of the imaginary circle, and a drive assembly (32, 34) that includes a shape memory alloy portion (40) extending in the tangent direction of the imaginary circle and drives the aperture blades (18, 20) by deformation of the shape memory alloy portion (40).

Description

[Technical field]

[0001] The invention relates to an aperture driving device, a photographing device and an electronic device. [Background technology]

[0002] Conventionally, the aperture diaphragm device has a structure as described in Patent Document 1, in which the aperture blades are linearly moved by rotating the rotation shaft. Therefore, there is a problem that a large torque is required to rotate the rotation shaft, and the structure for generating the large torque also needs to be large.

[0003] [Patent Literature]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-167186 [Summary of the invention]

[0005] [Technical Problems to be Solved by the Invention]

[0006] The present invention aims to provide an aperture stop driving device, a camera device and an electronic device which can be miniaturized and thinned.

[0007]

Technical solution

[0008] One aspect of the present invention is an aperture driving device, which has at least two groups of aperture blades parallel to the imaginary circle when an imaginary circle is set around the reference axis with the optical axis of the lens as the reference axis, a base that freely supports the aperture blades in the radial direction of the imaginary circle, and a driving component including a shape memory alloy portion extending in the tangential direction of the imaginary circle and driving the aperture blades by deformation of the shape memory alloy portion.

[0009] The drive assembly also includes a support component that extends parallel to the shape memory alloy portion, has elasticity, and supports the shape memory alloy portion. The shape memory alloy portion can be arranged on one of the radial outer side or inner side of the imaginary circle of the support portion, or can be arranged on the outer side and the inner side. The shape memory alloy portion has its two ends fixed on the support portion. The shape memory alloy portion can also be supported on the support component by a mounting ring. The two ends of the support portion are freely rotatably fastened to the fastening portion formed on the base.

[0010] Furthermore, a bracket for fixing the aperture blades may be provided. The bracket may be provided with a protrusion, and the drive assembly is pressed against the protrusion when the drive assembly is deformed. Furthermore, the center of the drive assembly may be connected to the bracket to drive the bracket.

[0011] Furthermore, the aperture blade may be one piece or at least two pieces overlapped.

[0012] Another aspect of the present invention is a camera device having the aperture stop driving device. Furthermore, the camera device may be used as a lens driving device instead of an aperture stop driving device.

[0013] Furthermore, another aspect of the present invention is an electronic device having the above-mentioned camera device.

[0014] [Effects of the invention]

[0015] According to the present invention, the aperture blades are driven by a driving member including a shape memory alloy portion extending in the tangential direction of a reference circle, thereby achieving miniaturization and thinning.

Brief Description of the Drawings

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Figure 1

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Figure 2

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Figure 3

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Figure 4

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Figure 5

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Fig. 6A

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Figure 6B

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Figure 7

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Figure 8

[0025]

Fig. 9

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Fig.10

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Fig.11

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Fig.12

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Fig.13

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Fig.14

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Explanation of symbols

[0032] 10 Aperture drive device

[0033] 12 abutment

[0034] 14 Abutment side opening

[0035] 16 Guide groove

[0036] 18 1st aperture blade

[0037] 20 2nd aperture blade

[0038] 22 Aperture side opening

[0039] 24 First Bracket

[0040] 26 Second bracket

[0041] 28 Outer protrusion

[0042] 30 Medial protrusion

[0043] 32 Driving unit for opening enlargement (driving unit)

[0044] 34 Driving unit for reducing the opening (driving unit)

[0045] 36 Installing parts

[0046] 38 Support components

[0047] 40 Shape memory alloy part

[0048] 42 Mounting component body

[0049] 44 Ring parts

[0050] 46 Insertion hole

[0051] 48 Support component insertion slot

[0052] 50 Supporting member body

[0053] 52 quilt closure

[0054] 54 Joint

[0055] 56 First Shape Memory Alloy Department

[0056] 58 Second Shape Memory Alloy Department

[0057] 60 bulge

[0058] 62 3rd aperture blade

[0059] 64 Third bracket

[0060] 66 Front blade

[0061] 68 rear blade [Specific implementation method]

[0062] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0063] Figure 1 FIG6 shows the first embodiment of the present invention. The aperture stop driving device 10 according to the first embodiment of the present invention is arranged in a photographing device by blocking and adjusting light so that it is incident on a lens, and a lens driving device is arranged in the rear stage of the aperture stop driving device 10. In the description of the first embodiment, the optical axis of the lens is taken as a reference axis Z, and the axes orthogonal to the reference axis Z are taken as an X axis and a Y axis.

[0064] The aperture stop driving device 10 has a base 12. The base 12 is a quadrangular member extending in the XY direction and is made of resin or the like. Figure 2 As shown in FIG. 1 , a base side opening 14 is formed in the center of the base 12. The base side opening 14 is circular. Figure 3 As shown, the center of the base side opening 14 communicates with the reference axis.

[0065] Furthermore, a guide groove 16 extending in the radial direction (Y-axis direction) of an imaginary circle centered on the reference axis is formed on the surface on the +Z side of the base 12. The first aperture blade 18 and the second aperture blade 20 are slidably fitted into the guide groove 16. The guide groove 16 guides the first aperture blade 18 and the second aperture blade 20 to overlap in the Z direction.

[0066] The first diaphragm blade 18 and the second diaphragm blade 20 have V-shaped cutouts on the reference axis side, and the peripheries of the cutouts overlap in the Z direction. The V-shaped cutouts of the first diaphragm blade 18 and the second diaphragm blade 20 form a quadrangular diaphragm side opening 22 .

[0067] A square first bracket 24 is fixed to the +Z side of the first aperture blade 18, and a square second bracket 26 is fixed to the +Z side of the second aperture blade 20. The first bracket 24 and the second bracket 26 are accommodated in the guide groove 16 and are slidable.

[0068] Outer protrusions 28, 28 and inner protrusions 30, 30 are formed at the ±Y side ends of the +Z side of the first bracket 24 and the second bracket 26, respectively, extending in the X direction and protruding in the Z direction. The inner side surfaces of the outer protrusions 28 and the inner protrusions 30 face each other in the Y direction.

[0069] The first bracket 24 and the second bracket 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 are sometimes simply referred to as drive units 32, 34.

[0070] The above-mentioned drive components 32, 34 are only installed in the opposite direction in the Y direction, and their structures are the same. Figure 5 As shown, the support portion is composed 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 along the X direction.

[0071] The mounting member 36 is made of resin or the like, and has a linear mounting member body 42. In this embodiment, a plurality of five annular members 44 are formed at a predetermined distance from one end to the other end on the Y-direction side surface of the mounting member body 42. Insertion holes 46 opening in the X-direction are formed in each of the annular members 44. The shape memory alloy part 40 formed in a round bar shape is inserted into the insertion hole 46.

[0072] Furthermore, a support member insertion groove 48 is formed in the mounting member body portion 42 of the mounting member 36, which penetrates 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 an elastic material such as phosphor bronze. Furthermore, the support member 38 is bent linearly in the Y direction at both ends of the support member body portion 50, thereby forming fastening portions 52, 52 that are bent in the opposite direction into a semicircular shape. The fastening portions 52, 52 are connected to the fastening portions 54, 54 (such as Figure 2 shown) are tied together so as to rotate freely.

[0073] The shape memory alloy part 40 is a shape memory alloy, composed of nickel-titanium or copper-zinc-aluminum alloys, and returns to its original shape once it reaches a certain temperature. In this embodiment, the annular parts 44 at both ends are bound to fix their positions, and the other annular parts 44 are embedded so that the shape memory alloy part 40 does not detach from the mounting part 36. The original shape of the shape memory alloy part 40 is shorter than the shape shown in the figure. Once it reaches a certain temperature, the shape memory alloy part 40 deforms and shrinks. In this embodiment, once the shape memory alloy part 40 is passed through an electric current, it is heated by the Joule heat generated by the current flowing through it, and its length becomes shorter. Once the length of the shape memory alloy part 40 becomes shorter, the elasticity of the drive components 32, 34 and the mounting part body 42 and the support part 50 resist each other, and it is deformed into a bow shape protruding from the side of the mounting part 36.

[0074] The mounting members 36 of the opening enlarging drive units 32, 32 face the inner side surfaces of the outer protruding parts 28, 28 in the Y direction. The mounting members 36 of the opening reducing drive units 34, 34 face the inner side surfaces of the inner protruding parts 30, 30 in the Y direction.

[0075] Next, the operation of the first embodiment will be described.

[0076] exist Fig. 6A The case where the opening diameter is enlarged is shown in FIG.

[0077] When the shape memory alloy part 40 of the opening expansion drive assembly 32, 32 is energized, the opening expansion drive assembly 32, 32 bends radially outward of the imaginary circle as shown in the state A1 of FIG. Moreover, the center part of the mounting member 36 presses the outer protrusions 28, 28 to contact the outer side, and resists the friction force generated between the base 12, pushing the first aperture blade 18 and the second aperture blade 20 outward. In this case, Fig. 6A As shown in the state A2, when it contacts the opening reduction driving components 34, 34 of each inner protrusion 30, 30 which has not been deformed, the movement stops.

[0078] Once the shape memory alloy portion 40 of the opening expansion drive assembly 32, 32 is no longer energized, the opening expansion drive assembly 32, 32 returns to a straight state, but the first aperture blade 18 and the second aperture blade 20 respectively stay at the stopped position together with the first bracket 24 and the second bracket 26, and the aperture diameter remains in the expanded state.

[0079] exist Figure 6B The case where the opening diameter is reduced is shown in FIG.

[0080] When the shape memory alloy portion 40 of the opening reduction drive components 34, 34 is energized, the opening reduction drive components 34, 34 are Figure 6B As shown in the state B1, it bends radially inward of the imaginary circle. Moreover, the central part of the mounting member 36 presses the inner protrusions 30, 30 inward, resists the friction force generated between the base 12, and pushes the first aperture blade 18 and the second aperture blade 20 inward. In this case, as Figure 6B As shown in the state B2, when it contacts the opening enlarging driving components 32, 32 of each outer protrusion 28, 28 which has not been deformed, the movement stops.

[0081] Once the shape memory alloy portion 40 of the opening reduction drive assembly 34, 34 is no longer energized, the opening expansion drive assembly 34, 34 returns to a straight state, but the first aperture blade 18 and the second aperture blade 20 respectively stay at the stopped position together with the first bracket 24 and the second bracket 26, and the aperture diameter remains in the reduced state.

[0082] Therefore, according to the first embodiment of the present invention, it is possible to provide an aperture stop driving device with a simple structure capable of setting the aperture stop diameter to a large state or a small state (two states of small F value and large F value) and achieving miniaturization and thinning.

[0083] Figures 7 to 10 The second embodiment of the present invention is an aperture stop driving device 10. The second embodiment is different from the first embodiment in the structure of the driving assembly and the mounting position thereof.

[0084] The drive components 32, 32 are used for both opening enlargement and opening reduction. Fig.10As shown, the support portion is composed of a support member 38 that is used as 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 composed of an elastic member such as phosphor bronze, and five annular members 44 composed of an insulating material such as resin are formed at a predetermined distance from one end to the other end on both sides of the support member body 50 in the Y direction of the support member 38. The first shape memory alloy portion 56 and the second shape memory alloy portion 58 formed in a round rod 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 annular members 44 located at both ends in the X direction.

[0085] The supporting member 38 is bent into a semicircle at both ends of the supporting member body 50 in the Y direction, and cylindrical fastened parts 52, 52 are formed at the top ends. The fastened parts 52, 52 are rotatably fastened to fastening parts 54, 54 formed to protrude from the +Z surface of the base 12.

[0086] The first shape memory alloy part 56 of the driving assembly 32 is arranged on the inner side in the Y direction, and the second shape memory alloy part 58 is arranged on the outer side in the Y direction. In addition, a convex part 60 protruding in the Y direction is formed on the first bracket 24 and the second bracket 26. The annular component 44 located in the center in the X direction is connected to the convex part 60 from the inner side in the Y direction.

[0087] In the structure shown, once a current is passed between the ends of the first shape memory alloy part 56, the first shape memory alloy part 56 contracts by a predetermined amount in the long-side direction according to the temperature rise caused by the energization. The second shape memory alloy part 58 and the support member 38 do not contract, so the drive assembly 32 is convex on the side of the second shape memory alloy part 58 and is bent into an arch. Moreover, once a current is passed between the ends of the second shape memory alloy part 58, the second shape memory alloy part 58 contracts by a predetermined amount in the long-side direction according to the temperature rise caused by the energization. The first shape memory alloy part 56 and the support member 38 do not contract, so the drive assembly 32 is convex on the side of the first shape memory alloy part 56 and is bent into an arch.

[0088] That is, when the first shape memory alloy part 56 is energized, the drive assembly 32 bends outward, and the central annular member 44 pulls the convex portions 60, 60 of the first bracket 24 and the second bracket 26 outward. The first aperture blade 18 resists the friction force generated between the first aperture blade 18, the first bracket 24, and the base 12, and moves outward, and the second aperture blade 20 resists the friction force generated between the second aperture blade 20, the second bracket 26, and the base 12, and moves outward. The aperture opening 22 expands to a position where the contraction force of the first shape memory alloy part 56 and the restoring force relative to the bending deflection of the support member 38 and the second shape memory alloy part 58 are balanced.

[0089] When the power supply to the first shape memory alloy portion 56 is subsequently stopped, the first shape memory alloy portion 56 returns to its length before contraction, the drive assembly 32 becomes a straight state, and the aperture side opening portion 22 returns to the initial state.

[0090] On the other hand, when the second shape memory alloy part 58 is energized, the drive assembly 32 bends inwardly, and the central annular member 44 pushes the protrusions 60, 60 of the first bracket 24 and the second bracket 26 inwardly. The first aperture blade 18 moves inwardly against the friction force generated between the first aperture blade 18, the first bracket 24, and the base 12, and the second aperture blade 20 moves inward against the friction force generated between the second aperture blade 20, the second bracket 26, and the base 12. The aperture opening 22 expands to a position where the contraction force of the second shape memory alloy part 58 and the restoring force to the bending deflection of the support member 38 and the first shape memory alloy part 56 are balanced.

[0091] When the power supply to the second shape memory alloy portion 58 is subsequently stopped, the second shape memory alloy portion 58 returns to its length before contraction, the drive assembly 32 becomes a straight state, and the aperture side opening portion 22 returns to the initial state.

[0092] Therefore, according to the second embodiment of the present invention, it is possible to provide an aperture stop driving device with a simple structure that can arbitrarily set the aperture stop diameter size (any diameter in the range of small F value to large F value) and can achieve miniaturization and thinning.

[0093] Figures 11 to 14 The third embodiment of the present invention is an aperture diaphragm driving device 10. The third embodiment is the same as the driving assembly 32 of the second embodiment, but the sliding direction of the diaphragm blades, the number of diaphragm blades, and the structure of the diaphragm blades are different from those of the second embodiment, forming a hexagonal diaphragm side opening.

[0094] In the third embodiment, the reference axis is Z, and three directions that are perpendicular to Z and mutually form an angle of 120 degrees are P, Q, and R. The drive unit 32 is connected to the first bracket 24, the second bracket 26, and the third bracket 64 fixed to the first aperture blade 18, the second aperture blade 20, and the third aperture blade 62. The drive unit 32 including the first shape memory alloy portion 56 and the second shape memory alloy portion 58 slides the first aperture blade 18, the second aperture blade 20, and the third aperture blade 62 in the directions of P, Q, and R, respectively.

[0095] Furthermore, the first diaphragm blade 18 , the second diaphragm blade 20 , and the third diaphragm blade 62 are composed of a front blade 66 and a rear blade 68 that overlap each other.

[0096] The front blade 66 and the rear blade 68 overlap in the Z direction to form two sides of the V-shape of the hexagonal diaphragm-side opening 22 .

[0097] The first diaphragm blade 18 , the diaphragm blade 20 , and the front blade 66 of the third diaphragm blade 62 are arranged so as to be located in front of the rear blade 68 of the adjacent diaphragm blades 18 to 20 , respectively.

[0098] In the first and second embodiments, one plate is machined and etched to form two sides of a V-shape. Therefore, the opening angle of the V-shape remains rounded to a certain extent. If you want to avoid the existence of this round shape, use the two overlapping blades of the third embodiment.

[0099] Furthermore, when it is necessary to set the opening area of ​​the aperture side opening portion 22 to a smaller value, a portion of the front blade 66 and the rear blade 68 may be cut off to avoid mutual interference between the blades.

[0100] Therefore, according to the third embodiment of the present invention, it is possible to provide an aperture stop driving device with a simple structure that can arbitrarily set the aperture stop diameter size (any diameter in the range of small F value to large F value) and can achieve miniaturization and thinning.

[0101] In the above embodiment, an example of using the present invention in an aperture diaphragm driving device is described, but this description can also be applied to a lens driving device. That is, a lens holding portion that supports the lens can be provided on a mover instead of an aperture blade, and the mover can be driven by a driving assembly having the shape memory alloy portion. Furthermore, an aperture diaphragm driving device is described, but this description can also be applied to a photographic device using the aperture diaphragm device, or even an electronic device having a photographic device.

Claims

1. An aperture driving device, characterized in that: include When an imaginary circle is set around the optical axis of the lens as a reference axis, at least two groups of aperture blades parallel to the imaginary circle are provided. a base for freely supporting the aperture blades in the radial direction of the imaginary circle, A drive assembly including a shape memory alloy portion extending in a tangent direction of the imaginary circle and driving the aperture blades by deformation of the shape memory alloy portion; and The driving assembly further includes a support portion extending parallel to the shape memory alloy portion, having elasticity, and supporting the shape memory alloy portion; The shape memory alloy portion is arranged on one of the radially outer side or the radially inner side of the imaginary circle of the support portion, or is arranged on the outer side and the inner side; The shape memory alloy part has two ends fixed on the support part; Both ends of the support portion are freely rotatably fastened to the fastening portions formed on the base; The aperture drive device further comprises a bracket which is free to move in the radial direction of the base, and the aperture blades are fixed on the bracket; The bracket has a protrusion, and the driving component is deformed into a bow shape by passing a current through the shape memory alloy part, thereby shortening the length of the shape memory alloy part. When the driving component is deformed, the driving component presses and contacts the protrusion.

2. The aperture diaphragm driving device according to claim 1, characterized in that: The support portion has a plurality of annular components into which the shape memory alloy portion is inserted.

3. The aperture diaphragm driving device according to claim 1, characterized in that: The center of the driving assembly is connected to the bracket.

4. The aperture diaphragm driving device according to claim 1, characterized in that: The aperture blades are formed by at least two overlapping blades in the reference axis direction.

5. A photographic device, characterized in that: Comprising the opening aperture as described in any one of claims 1 to 4.

6. A photographic device, characterized in that: include A lens, wherein an optical axis of the lens is used as a reference axis and an imaginary circle is set around the reference axis; A base that movably supports a mover, the mover having a lens support portion that supports the lens; A drive assembly having a shape memory alloy portion extending in a direction orthogonal to the moving direction of the mover, and driving the mover by deformation of the shape memory alloy portion; The driving assembly further includes a support portion extending parallel to the shape memory alloy portion, having elasticity, and supporting the shape memory alloy portion; The shape memory alloy portion is arranged on one of the radially outer side or the radially inner side of the imaginary circle of the support portion, or is arranged on the outer side and the inner side; The shape memory alloy part has two ends fixed on the support part; Both ends of the support portion are freely rotatably fastened to the fastening portions formed on the base; A bracket freely movable in the radial direction of the base, the lens support portion being fixed on the bracket; The bracket has a protrusion, and the driving component is deformed into a bow shape by passing a current through the shape memory alloy part, thereby shortening the length of the shape memory alloy part. When the driving component is deformed, the driving component presses and contacts the protrusion.

7. An electronic device, characterized in that: A photographic device comprising the photographic device described in claim 5 or 6.

Images