Blade driving device

Abstract

Provided is a blade drive device capable of suppressing damage to a shape memory alloy. In a blade drive device (101), the size of an opening (AP) formed by a plurality of blade members (2) that rotate with the rotation of a rotating member (3) changes. A drive mechanism (DM) for rotating the rotating member (3) has a shape memory alloy wire (SA) and a leaf spring member (7). The plate spring member (7) has an acting portion (7P) for moving a receiving portion (RP) provided to the rotating member (3), and a second wire fixing portion (7W) provided between the base portion (7B) and the acting portion (7P). The second wire fixing part (7W) is arranged at a position different from that of the first wire fixing part (8W) in the Z-axis direction. The shape memory alloy wire (SA) is configured such that one end is fixed to the first wire fixing part (8W) and the other end is fixed to the second wire fixing part (7W). The second wire fixing part (7W) is configured such that the height (HT11) when the current is supplied is different from the height (HT1) when the current is not supplied.

Description

Technical Field

[0001] The present application relates to a blade drive device. Background Art

[0002] Conventionally, there is known a blade driving device that uses a shape memory alloy to move a plurality of blades so as to change the diameter of the opening of an aperture formed by the plurality of blades (see Patent Document 1). In this device, the shape memory alloy is configured to have an inner peripheral portion and an outer peripheral portion extending in the circumferential direction of an annular member, and a folded portion (Japanese: folded back portion) connecting the inner peripheral portion and the outer peripheral portion.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-148842 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, the above device is configured such that when current is supplied to the shape memory alloy, the shape memory alloy contracts and pulls the protrusion provided on the annular member. This may cause the wire to break at the folded portion that pulls the protrusion after long-term use.

[0008] Therefore, it is desired to provide a blade drive device that can suppress damage such as wire breakage of the shape memory alloy.

[0009] Means for solving technical problems

[0010] The blade drive device of one embodiment of the present application comprises: a fixed side component; a rotating component that can rotate relative to the fixed side component; a plurality of blade components that can be rotatably supported on the fixed side component and rotate in conjunction with the rotation of the rotating component; and a driving mechanism that rotates the rotating component, the blade drive device rotates the plurality of blade components respectively along with the rotation of the rotating component, thereby changing the size of the opening formed by the plurality of blade components, the driving mechanism is composed of a shape memory alloy wire and a leaf spring component, the fixed side component has a first wire fixing portion, and the leaf spring component has a first wire fixing portion fixed to The fixed side component comprises a base, an action portion capable of moving a receiving portion provided on the rotating component, and a second wire fixing portion provided between the base and the action portion, wherein the second wire fixing portion is arranged at a position different from the first wire fixing portion in the axial direction along the rotation axis of the rotating component, the shape memory alloy wire is configured with one end fixed to the first wire fixing portion and the other end fixed to the second wire fixing portion, and is in a straight line when current is supplied, and the position of the second wire fixing portion in the axial direction when current is supplied is different from the position of the second wire fixing portion in the axial direction when current is not supplied.

[0011] Effects of the Invention

[0012] The above-mentioned blade driving device can suppress the occurrence of damage to the shape memory alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an upper perspective view of the blade drive device according to the embodiment of the present application.

[0014] Figure 2 yes Figure 1 An exploded perspective view of the blade drive device shown.

[0015] Figure 3 This is a bottom view of the cover component, blade component, and rotating component.

[0016] Figure 4 It is a top view of the cover component, the blade component, and the rotating component.

[0017] Figure 5 yes Figure 1 A bottom perspective view of the blade drive device is shown.

[0018] Figure 6 It is a bottom perspective view of the rotating component, base component, conductive component and driving mechanism.

[0019] Figure 7 These are top and bottom views of the drive mechanism and conductive components.

[0020] Figure 8 It is a left side view of the drive mechanism and conductive parts.

[0021] Fig. 9 It is a bottom perspective view of the blade component, rotating component and driving mechanism.

[0022] Fig.10 It is a bottom view of the blade driving device with the casing member removed.

[0023] Fig.11 It is a bottom view of the working part.

[0024] Fig.12 It is a bottom view of another structural example of the blade drive device. DETAILED DESCRIPTION

[0025] Hereinafter, a blade driving device 101 according to an embodiment of the present application will be described with reference to the drawings. Figure 1 1 is a top perspective view of the blade drive device 101 functioning as a variable aperture device. Specifically, Figure 1 The upper figure is a top perspective view of the blade driving device 101 when the aperture AP formed by the six blade components 2 is in a middle open state. Figure 1 The central figure is an upper perspective view of the blade driving device 101 when the aperture AP of the aperture is in the minimum open state. Figure 1 The lower figure is a top perspective view of the blade drive device 101 when the aperture AP of the aperture is in the maximum open state. The intermediate open state is a state in which the size of the aperture AP (opening area or aperture diameter) is larger than that in the minimum open state and smaller than that in the maximum open state. Figure 1 In the figure, a dot pattern is added to the opening AP for clarity.

[0026] exist Figure 1 In , X1 represents one direction of the X axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. In addition, Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. Figure 1In the figure, the X1 side of the blade drive device 101 corresponds to the front side (front side) of the blade drive device 101, and the X2 side of the blade drive device 101 corresponds to the rear side (back side) of the blade drive device 101. In addition, the Y1 side of the blade drive device 101 corresponds to the left side of the blade drive device 101, and the Y2 side of the blade drive device 101 corresponds to the right side of the blade drive device 101. In addition, the Z1 side of the blade drive device 101 corresponds to the upper side (the side of the object being photographed) of the blade drive device 101, and the Z2 side of the blade drive device 101 corresponds to the lower side (the side of the imaging element) of the blade drive device 101. The same is true in other figures.

[0027] In the illustrated example, the blade drive device 101 is configured to be mounted on the upper side (the side of the object being photographed) of a fixed lens not shown in the figure and function as a variable aperture device. In addition, the blade drive device 101 is also configured to be mounted on the upper side (the side of the object being photographed) of a movable lens that moves in the optical axis direction by an autofocus function and function as a variable aperture device. In this case, the movable lens may also be a lens included in a lens drive device having a hand shake correction function by a camera element shift method. In addition, the blade drive device 101 may also be configured to move together with the movable lens. Alternatively, the blade drive device 101 may also be configured to be mounted inside a lens drive device having a periscope actuator and function as a variable aperture device.

[0028] Specifically, the blade drive device 101 is as shown in the exploded perspective view of the blade drive device 101. Figure 2 As shown, it includes a cover member 1 , a blade member 2 , a rotating member 3 , an inner cover member 4 , a base member 5 , a conductive member 6 , a leaf spring member 7 , a metal member 8 , and a case member 9 .

[0029] The cover member 1 is a member constituting a part of the housing HS. Figure 1 As shown, the cover member 1 is joined to the case member 9 by adhesive or welding, etc., and constitutes the housing HS together with the case member 9. In the example shown in the figure, the cover member 1 is an annular member formed of a metal plate and has an opening 1K.

[0030] The blade member 2 is a member constituting the aperture. In the illustrated example, the blade member 2 is a flat plate-shaped member formed of a metal plate, and includes a first blade member 2A to a sixth blade member 2F. The first blade member 2A to the sixth blade member 2F have the same shape and the same size.

[0031] The rotating member 3 is a member constituting an opening and closing mechanism of the aperture, and is configured to be able to rotate Figure 1 The rotating member 3 rotates about the rotation axis RX shown. In the example shown in the figure, the rotating member 3 includes a first plate-shaped portion 3M which is an annular member formed of a metal plate having an opening 3K.

[0032] The inner cover member 4 is a member that cooperates with the cover member 1 to form a space for accommodating the blade member 2 and the rotating member 3. In the illustrated example, the inner cover member 4 is a substantially cylindrical member formed of a metal plate and has an opening 4K. Figure 2 As shown, the inner cover member 4 includes an annular second plate-shaped portion 4M and a cylindrical tube-shaped portion 4C extending from an inner edge portion of the second plate-shaped portion 4M along the rotation axis RX.

[0033] The base member 5 is a member that supports the driving mechanism DM. In the example shown in the figure, the base member 5 is a member formed by injection molding using a synthetic resin.

[0034] The driving mechanism DM is a mechanism for rotating the rotating member 3 around the rotation axis RX. In the example shown in the figure, the driving mechanism DM includes a leaf spring member 7, a metal member 8, and a shape memory alloy wire SA. Figure 2 As shown, the drive mechanism DM includes a first drive mechanism DM1 that rotates the rotating member 3 in the direction indicated by the arrow AR1 to increase the aperture AP of the diaphragm, and a second drive mechanism DM2 that rotates the rotating member 3 in the direction indicated by the arrow AR2 to decrease the aperture AP of the diaphragm.

[0035] The shape memory alloy wire SA is an example of a shape memory actuator and constitutes a driving mechanism DM. In the illustrated example, the shape memory alloy wire SA includes a right wire SAR constituting a first driving mechanism DM1 and a left wire SAL constituting a second driving mechanism DM2. When current flows, the temperature of the shape memory alloy wire SA rises and contracts in accordance with the rise in its temperature. The driving mechanism DM can rotate the rotating member 3 by utilizing the contraction of the shape memory alloy wire SA.

[0036] The conductive member 6 is a member for conducting electricity. In the example shown in the figure, the conductive member 6 is formed of a magnetic metal such as iron. The conductive member 6 is a member partially embedded in the base member 5, and includes a first conductive member 6A to a third conductive member 6C.

[0037] The leaf spring member 7 is a member constituting the drive mechanism DM. Specifically, the leaf spring member 7 includes a right leaf spring member 7R constituting the first drive mechanism DM1 and a left leaf spring member 7L constituting the second drive mechanism DM2.

[0038] The metal member 8 is a member constituting the drive mechanism DM. Specifically, the metal member 8 includes a right metal member 8R constituting the first drive mechanism DM1 and a left metal member 8L constituting the second drive mechanism DM2.

[0039] In the example shown, Figure 2As shown, one end of the shape memory alloy wire SA is fixed to the metal component 8, and the other end is fixed to the leaf spring component 7. Specifically, one end of the right side wire SAR is fixed to the right side metal component 8R, and the other end is fixed to the right side leaf spring component 7R. In addition, one end of the left side wire SAL is fixed to the left side metal component 8L, and the other end is fixed to the left side leaf spring component 7L. More specifically, the metal component 8 is formed with a first wire fixing portion 8W for fixing one end of the shape memory alloy wire SA, and the leaf spring component 7 is formed with a second wire fixing portion 7W for fixing the other end of the shape memory alloy wire SA. More specifically, the right side metal component 8R is formed with a first right side wire fixing portion 8WR for fixing one end of the right side wire SAR, and the right side leaf spring component 7R is formed with a second right side wire fixing portion 7WR for fixing the other end of the right side wire SAR. In addition, the left side metal component 8L is formed with a first left side wire fixing portion 8WL for fixing one end of the left side wire SAL, and the left side leaf spring component 7L is formed with a second left side wire fixing portion 7WL for fixing the other end of the left side wire SAL.

[0040] In the present embodiment, the fixing of one end of the shape memory alloy wire SA using the metal component 8 is achieved by bending a portion of the metal component 8 formed by a metal plate in a manner that clamps one end of the shape memory alloy wire SA. Therefore, the first wire fixing portion 8W becomes a clamping portion that clamps one end of the shape memory alloy wire SA. In addition, the fixing of the other end of the shape memory alloy wire SA using the leaf spring component 7 is achieved by bending a portion of the leaf spring component 7 formed by a metal plate in a manner that clamps the other end of the shape memory alloy wire SA. Therefore, the second wire fixing portion 7W becomes a clamping portion that clamps the other end of the shape memory alloy wire SA. In addition, the fixing of the metal component 8 or the leaf spring component 7 to the shape memory alloy wire SA can also be achieved by an adhesive, and can also be strengthened by an adhesive.

[0041] The housing member 9 is a member constituting a part of the housing HS. Figure 1 As shown, the housing member 9 is joined to the cover member 1 by adhesive or welding to form the housing HS together with the cover member 1. In the example shown in the figure, the housing member 9 is a cylindrical member formed of metal and has an opening 9K. Figure 2 As shown, the case member 9 includes an annular third plate-shaped portion 9M and a cylindrical tube-shaped portion 9C extending from the outer edge of the third plate-shaped portion 9M along the rotation axis RX.

[0042] like Figure 2As shown, the cover part 1, the blade part 2, the rotating part 3, and the inner cover part 4 are combined by engaging the engaging parts provided in each part with the engaged parts. Specifically, the cover part 1 has six convex parts 1P protruding downward from the lower surface as the engaging parts, and six through holes 1H having rounded rectangular (long hole shape) as the engaged parts. In addition, the six blade parts 2 respectively have a circular first through hole 2H1 and a rounded rectangular second through hole 2H2 as the engaged parts. In addition, the rotating part 3 has six convex parts 3P protruding upward from the upper surface of the first plate-shaped part 3M as the engaging parts, and six through holes 3H having rounded rectangular as the engaged parts. In addition, the inner cover part 4 has six circular first through holes 4H1 formed in the second plate-shaped part 4M as the engaged parts. In addition, the engaging parts (convex parts) and the engaged parts (through holes) of the illustrated example can also be replaced by the engaged parts (through holes) and the engaging parts (convex parts), respectively.

[0043] More specifically, the six protrusions 1P of the cover member 1 are as follows. Figure 2 As shown by the dotted line DL1, the first through hole 2H1 of the blade member 2, the through hole 3H of the rotating member 3, and the first through hole 4H1 of the inner cover member 4 are respectively inserted, and are configured to be unable to move approximately relative to the first through hole 2H1 and the first through hole 4H1 respectively in the first through hole 2H1 and the first through hole 4H1, and to be able to move relatively relative to the through hole 3H in the through hole 3H. In addition, the convex portion 3P of the rotating member 3 is as shown in FIG. Figure 2 As shown by the dotted line DL2, the blade member 2 is inserted into the second through hole 2H2 and the through hole 1H of the cover member 1, and is configured to be able to move relative to the second through hole 2H2 and the through hole 1H respectively.

[0044] Here, refer to Figure 3 as well as Figure 4 The positional relationship among the cover member 1 , the blade member 2 , the rotating member 3 , and the inner cover member 4 will be described in detail. Figure 3 FIG. 1 is a bottom view of the cover member 1, the blade member 2, and the rotating member 3. Figure 3 In the figure, for the sake of clarity, only the protrusion 3P of the rotating member 3 is shown by a dotted line. Figure 3 The upper left figure, the left center figure and the lower left figure show the state of the cover member 1 and the rotating member 3 without the blade member 2 installed. Figure 3The upper right figure, the right center figure, and the lower right figure show the states of the cover member 1 and the rotating member 3 to which the blade member 2 is mounted. Moreover, the upper left figure corresponds to the upper right figure, the left center figure corresponds to the right center figure, and the lower left figure corresponds to the lower right figure. In addition, the upper left figure and the upper right figure are figures when the aperture AP of the diaphragm is in an intermediate open state, the left center figure and the right center figure are figures when the aperture AP of the diaphragm is in a maximum open state, and the lower left figure and the lower right figure are figures when the aperture AP of the diaphragm is in a minimum open state.

[0045] Figure 4 1 is a top view of the cover member 1, the blade member 2, and the rotating member 3. Specifically, Figure 4 The top figure is a top view of the rotating part 3 and the cover part 1 without the blade part 2 installed. Figure 4 The second figure from the top, the third figure from the top, and the bottom figure are top views of the rotating member 3 and the cover member 1 to which the blade member 2 is mounted. Figure 4 In the figure, for the sake of clarity, only the protrusion 1P of the cover member 1 is shown by a dotted line. Figure 4 The top figure and the second figure from the top are the figures when the aperture AP is in the middle open state, corresponding to Figure 3 In addition, Figure 4 The third figure from the top is the figure when the aperture AP is at its maximum open state, corresponding to Figure 3 Left central image and right central image of . Figure 4 The bottom figure is the figure when the aperture AP is at its minimum open state, corresponding to Figure 3 In addition, Figure 4 The range with the dot pattern added in the second figure from the top shows the portion where two adjacent blade members 2 overlap and contact each other.

[0046] More specifically, if Figure 3 As shown in the right center figure of FIG. 1 , when looking up, the rotating member 3 rotates clockwise from the rotation axis RX to the rotation axis RX. Figure 3 When the rotating member 3 is rotated by an angle θ1 from the state shown in the upper right figure, the protrusion 3P of the rotating member 3 moves to the right in the second through hole 2H2 of the fourth blade member 2D, and thus the fourth blade member 2D rotates around the corresponding protrusion 1P in the direction indicated by the arrow AR3.

[0047] That is, Figure 4 As shown in the third figure from the top, if the rotating component 3 rotates counterclockwise relative to the rotation axis RX in a top view, Figure 4When the second figure is rotated by an angle θ1 from the state shown in the figure, the convex portion 3P of the rotating member 3 moves to the left in the second through hole 2H2 of the fourth blade member 2D, so the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction shown by the arrow AR3.

[0048] The same applies to the first blade member 2A, the second blade member 2B, the third blade member 2C, the fifth blade member 2E, and the sixth blade member 2F. As a result, the aperture AP of the diaphragm is enlarged to the maximum open state.

[0049] On the contrary, Figure 3 As shown in the figure below, when looking up, the rotating component 3 rotates counterclockwise from the rotation axis RX. Figure 3 When the rotating member 3 is rotated by an angle θ2 from the state shown in the upper right figure, the protrusion 3P of the rotating member 3 moves to the left in the second through hole 2H2 of the fourth blade member 2D, and thus the fourth blade member 2D rotates around the corresponding protrusion 1P in the direction indicated by the arrow AR4.

[0050] That is, Figure 4 As shown in the bottom figure, when viewed from above, the rotating member 3 rotates clockwise from the rotation axis RX. Figure 4 When the state shown in the second figure is rotated by an angle θ2, the convex portion 3P of the rotating member 3 moves to the right in the second through hole 2H2 of the fourth blade member 2D, so the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction indicated by the arrow AR4.

[0051] The same applies to the first blade member 2A, the second blade member 2B, the third blade member 2C, the fifth blade member 2E, and the sixth blade member 2F. As a result, the aperture AP of the diaphragm is reduced to the minimum open state.

[0052] Next, refer to Figure 5 to Figure 7 The path of the current flowing through the shape memory alloy wire SA will be described. Figure 5 1 is a bottom perspective view of the blade drive device 101. Specifically, Figure 5 The upper figure is a bottom perspective view of the blade drive device 101 with the housing member 9 installed. Figure 5 The central figure is a bottom perspective view of the blade drive device 101 with the housing member 9 removed. Figure 5 The lower figure is a bottom perspective view of the blade driving device 101 in a state where the cover member 1 and the inner cover member 4 are further removed. Figure 6 It is a bottom perspective view of the rotating member 3, the base member 5, the conductive member 6, and the driving mechanism DM. Figure 7 DM and the conductive member 6 are combined with each other. Specifically, Figure 7The above figure is a top view of the driving mechanism DM and the conductive component 6. Figure 7 The lower figure is a bottom view of the driving mechanism DM and the conductive component 6. Figure 7 In the figure, for the sake of clarity, a dot pattern is added to the leaf spring member 7 and the metal member 8 constituting the drive mechanism DM.

[0053] like Figure 6 As shown in FIG. 1 , the rotating member 3 has a protrusion 3T protruding downward from the lower surface of the first plate-shaped portion 3M. The protrusion 3T constitutes a receiving portion RP that receives the force (pressing force) generated by the driving mechanism DM. In the example shown in the figure, the protrusion 3T is formed by bending a portion of the first plate-shaped portion 3M downward. Figure 6 In the figure, for the sake of clarity, a dot pattern is added to the protrusion 3T serving as the receiving portion RP.

[0054] like Figure 6 As shown, the base member 5 has an annular and flat plate-shaped base portion 5B and a partially annular pedestal portion 5D protruding downward from the inner edge of the base portion 5B. A notch portion 5C is formed in the base portion 5B for the protrusion 3T of the receiving portion RP to pass through.

[0055] like Figure 6 As shown, the conductive component 6 includes an embedded portion EP embedded in the base component 5, a connecting portion CS exposed on the lower surface of the base component 5, and a terminal portion TM provided in a manner protruding downward from the base component 5. Specifically, the conductive component 6 includes a first conductive component 6A to a third conductive component 6C. Moreover, the first conductive component 6A includes a first embedded portion EP1, a first connecting portion CS1, and a first terminal portion TM1, the second conductive component 6B includes a second embedded portion EP2, a second connecting portion CS2, and a second terminal portion TM2, and the third conductive component 6C includes a third embedded portion EP3, a third connecting portion CS3, and a third terminal portion TM3. The third connecting portion CS3 includes a third left connecting portion CS3L and a third right connecting portion CS3R.

[0056] The first connection portion CS1 and the second connection portion CS2 are configured to be exposed at the position of the recess 5S in the lower surface of the base portion 5B of the base member 5. In addition, the third left connection portion CS3L and the third right connection portion CS3R are configured to be exposed at the position of the recess 5R in the lower surface of the pedestal portion 5D of the base member 5.

[0057] like Figure 6As shown, the leaf spring member 7 includes a base portion 7B fixed to the base member 5, an action portion 7P that can be moved by pressing a receiving portion RP provided on the rotating member 3, and a second wire fixing portion 7W provided between the base portion 7B and the action portion 7P. In addition, the leaf spring member 7 includes a first elastic arm portion 7F that can be elastically deformed and provided between the base portion 7B and the second wire fixing portion 7W, and a second elastic arm portion 7G that can be elastically deformed and provided between the action portion 7P and the second wire fixing portion 7W.

[0058] Specifically, the left leaf spring component 7L has a left base 7BL, a left action portion 7PL, a second left wire fixing portion 7WL, a first left elastic arm portion 7FL and a second left elastic arm portion 7GL, and the right leaf spring component 7R has a right base 7BR, a right action portion 7PR, a second right wire fixing portion 7WR, a first right elastic arm portion 7FR and a second right elastic arm portion 7GR.

[0059] like Figure 6 As shown, two first through holes 7H1 are formed in the base 7B, and two cylindrical protrusions 5P formed in a manner protruding downward from the lower surface of the base portion 5D of the base member 5 are inserted through the two first through holes 7H1. In the example shown in the figure, the base member 5 is joined to the base 7B by performing hot riveting or cold riveting on the two protrusions 5P inserted into the two first through holes 7H1. However, the base member 5 and the base 7B can also be joined by an adhesive.

[0060] In addition, if Figure 6 As shown, a second through hole 7H2 is formed in the central portion of each base 7B. The second through hole 7H2 is used when joining the base 7B to the conductive component 6. In the illustrated example, the second through hole 7H2 is used when joining the base 7B to the third connection portion CS3 of the conductive component 6. The joining of the base 7B to the third connection portion CS3 is achieved by laser welding. However, the joining of the base 7B to the third connection portion CS3 can also be achieved by solder or a conductive adhesive. In the illustrated example, the left base 7BL of the left leaf spring component 7L is joined to the third left connection portion CS3L of the third conductive component 6C by laser welding, and the right base 7BR of the right leaf spring component 7R is joined to the third right connection portion CS3R of the third conductive component 6C by laser welding.

[0061] The action part 7P is respectively arranged in the notch part 5C of the base member 5 so as to be able to press the protrusion 3T as the receiving part RP in the circumferential direction. In the example shown in the figure, the action part 7P is respectively arranged so as to press the protrusion 3T as the receiving part RP in the circumferential direction when the current is supplied to the corresponding shape memory alloy wire SA. Figure 5 As shown in the center figure of FIG. 1 , the inner cover member 4 slides on the lower surface of the second plate-shaped portion 4M and contacts the protrusion 3T serving as the receiving portion RP.

[0062] The metal component 8 is a component fixed to the base component 5, and includes a left metal component 8L and a right metal component 8R. Figure 6 As shown, two first through holes 8H1 are formed in the metal component 8, and two cylindrical protrusions 5Q formed in a manner protruding downward from the lower surface of the base 5B of the base component 5 are inserted into the two first through holes 8H1. In the example shown in the figure, the base component 5 is joined to the metal component 8 by performing hot riveting or cold riveting on the two protrusions 5Q inserted into the two first through holes 8H1. However, the base component 5 and the metal component 8 can also be joined by an adhesive.

[0063] In addition, if Figure 6 As shown, a second through hole 8H2 is formed in the central portion of each metal component 8. The second through hole 8H2 is used when joining the metal component 8 to the conductive component 6. In the illustrated example, the joining of the metal component 8 to the conductive component 6 is achieved by laser welding. However, the joining of the metal component 8 to the conductive component 6 can also be achieved by solder or a conductive adhesive. In the illustrated example, the right metal component 8R is joined to the first connecting portion CS1 of the first conductive component 6A by laser welding, and the left metal component 8L is joined to the second connecting portion CS2 of the second conductive component 6B by laser welding.

[0064] In the above-described configuration, if the first terminal portion TM1 of the first conductive member 6A is connected to a high potential and the third terminal portion TM3 of the third conductive member 6C is connected to a low potential, the current is as follows: Figure 7 As shown by the dotted arrow in the above figure, it flows to the third terminal portion TM3 of the third conductive component 6C through the first conductive component 6A (the first terminal portion TM1, the first embedded portion EP1, and the first connecting portion CS1), the right metal component 8R, the right wire SAR, the right leaf spring component 7R (the second right wire fixing portion 7WR, the first right elastic arm portion 7FR and the right base 7BR), and the third conductive component 6C (the third right connecting portion CS3R and the third embedded portion EP3).

[0065] In addition, if the second terminal portion TM2 of the second conductive component 6B is connected to a high potential and the third terminal portion TM3 of the third conductive component 6C is connected to a low potential, the current is as follows: Figure 7As shown by the single-dot dash arrow in the above figure, it flows to the third terminal portion TM3 of the third conductive component 6C through the second conductive component 6B (the second terminal portion TM2, the second embedded portion EP2, and the second connecting portion CS2), the left metal component 8L, the left wire SAL, the left leaf spring component 7L (the second left wire fixing portion 7WL, the first left elastic arm portion 7FL and the left base portion 7BL), and the third conductive component 6C (the third left connecting portion CS3L and the third embedded portion EP3).

[0066] Next, refer to Figure 8 to Figure 10 The operation of the driving mechanism DM will be described. Figure 8 DM2 is a left side view of the second driving mechanism DM2. Specifically, Figure 8 The upper figure is a left side view of the rotating member 3, the inner cover member 4, and the second driving mechanism DM2. Figure 8 The central figure and the lower figure are left side views of the rotating member 3 and the second driving mechanism DM2. Figure 8 The central figure of FIG. 1 is a figure showing a state when no current is supplied to the left side line SAL constituting the second drive mechanism DM2. Figure 8 The lower figure shows the state when current is supplied to the left line SAL. Fig. 9 2 is a bottom perspective view of the blade component 2, the rotating component 3, and the driving mechanism DM. Specifically, Fig. 9 The above picture shows the aperture AP at its maximum open state. Fig. 9 The central figure is when the aperture AP is in the middle open state. Fig. 9 The figure below shows the aperture AP at its minimum open state. Fig.10 1 is a bottom view of the blade drive device 101 with the housing member 9 removed. Specifically, Fig.10 The above picture shows the aperture AP at its maximum open state. Fig.10 The central figure is when the aperture AP is in the middle open state. Fig.10 The following figure shows the aperture AP at its minimum opening. Fig. 9 as well as Fig.10 In the figure, for the sake of clarity, a dot pattern is added to the components through which current flows.

[0067] The second driving mechanism DM2 is a mechanism for rotating the rotating member 3 around the rotation axis RX to reduce the aperture AP of the diaphragm. Figure 8 As shown, the left leaf spring member 7L, the left metal member 8L and the left wire SAL are included.

[0068] In the example shown, Figure 8As shown in the central figure of the left leaf spring component 7L, the left leaf spring component 7L is configured such that, in a state where no current is supplied to the left side wire SAL, the height HT1 of the second left side wire fixing portion 7WL is greater than the height HT2 of the left side action portion 7PL, greater than the height HT3 of the left side base portion 7BL, and greater than the height HT4 of the first left side wire fixing portion 8WL of the left side metal component 8L. In addition, the height HT1, the height HT2, the height HT3, and the height HT4 mean the distance to the lower surface of the first plate-shaped portion 3M of the rotating component 3 in the axial direction (Z-axis direction) along the rotation axis RX. In addition, the left leaf spring component 7L is configured such that the distance DS1 between the second left side wire fixing portion 7WL and the first left side wire fixing portion 8WL in the axial direction is greater than the distance DS2 between the second left side wire fixing portion 7WL and the left side base portion 7BL in the axial direction.

[0069] When current is supplied to the left side wire SAL of the second driving mechanism DM2 constituting the left side leaf spring member 7L including the above-mentioned structure and the left side wire SAL contracts, the first left side elastic arm portion 7FL bends and the second left side wire fixing portion 7WL moves upward (the lower side in the figure, i.e., the Z1 direction) along the rotation axis RX. Furthermore, when the second left side wire fixing portion 7WL moves upward, the second left side elastic arm portion 7GL bends and the left side action portion 7PL slides on the surface (lower surface) of the second plate-shaped portion 4M of the inner cover member 4 and moves in a direction away from the second left side wire fixing portion 7WL in a manner substantially along the circumference of a circle centered on the rotation axis RX.

[0070] Specifically, the height HT1 of the second left wire fixing portion 7WL when no current is supplied to the left wire SAL (see Figure 8 The position of the central figure) is moved to the height HT11 (refer to Figure 8 ) in the figure below). Figure 8 The square arrow in the figure below indicates that the second left side wire fixing portion 7WL moves upward (toward the first plate-shaped portion 3M of the rotating member 3). Figure 8 The above description relates to the second drive mechanism DM2 that rotates the rotating member 3 to reduce the aperture AP of the diaphragm, but the same is applicable to the first drive mechanism DM1 that rotates the rotating member 3 to increase the aperture AP of the diaphragm.

[0071] When changing the viewpoint, such as Fig. 9 As shown in the figure above, when current is supplied to the right line SAR, the right action part 7PR moves while pressing the protrusion 3T as the receiving part RP in the direction indicated by the arrow AR5, so that the protrusion 3T moves in the direction indicated by the arrow AR5, thereby rotating the rotating member 3. As a result, the blade member 2 rotates in accordance with the rotation of the rotating member 3, and the aperture AP becomes larger. Similarly, when current is supplied to the left line SAL, as shown in FIG. Fig. 9As shown in the figure below, the left action part 7PL moves while pressing the protrusion 3T as the receiving part RP in the direction indicated by the arrow AR6, so that the protrusion 3T moves in the direction indicated by the arrow AR6, thereby rotating the rotating member 3. As a result, the blade member 2 rotates in accordance with the rotation of the rotating member 3, and the aperture AP of the diaphragm becomes smaller.

[0072] When the viewpoint is further changed, Fig.10 As shown, when current is supplied to the right line SAR, Fig.10 As shown in the figure above, the right action part 7PR moves while pressing the protrusion 3T as the receiving part RP clockwise relative to the rotation axis RX when viewed from above, so that the protrusion 3T moves clockwise, thereby rotating the rotating member 3 by an angle θ1. The angle θ1 is the angle between the right action part 7PR and the rotating member 3. Fig.10 When the shape memory alloy wire SA is supplied with current as shown in the center figure, that is, when the aperture AP is in the middle open state, the rotation angle of the rotating member 3 about the rotation axis RX is centered. As a result, the blade member 2 rotates in accordance with the rotation of the rotating member 3, and the aperture AP becomes larger. Similarly, when the left wire SAL is supplied with current, as shown in Fig.10 As shown in the figure below, the left action part 7PL moves while pressing the protrusion 3T as the receiving part RP counterclockwise relative to the rotation axis RX when viewed from above, so that the protrusion 3T moves counterclockwise, thereby rotating the rotating member 3 by an angle θ2. The angle θ2 is the angle of rotation when the rotation axis RX is not aligned. Fig.10 The rotation angle about the rotation axis RX is the center when the shape memory alloy wire SA is supplied with current as shown in the center figure, that is, when the aperture AP is in the middle open state. As a result, the blade member 2 rotates in accordance with the rotation of the rotating member 3, and the aperture AP becomes smaller.

[0073] Here, refer to Fig.11 The details of the action portion 7P that contacts the protrusion 3T as the receiving portion RP provided on the rotating member 3 will be described. Fig.11 This is a bottom view of the action part 7P, which is equivalent to Fig.10 The enlarged view of the range R1 surrounded by the dotted line in the central figure of FIG. Fig.11 In the figure, for the sake of clarity, a fine dot pattern is added to the rotating member 3, and a coarse dot pattern is added to the second plate-shaped portion 4M of the inner cover member 4.

[0074] like Fig.11As shown, the protrusion 3T provided on the rotating member 3 is configured to penetrate the second through hole 4H2 of the rounded rectangular shape formed in the second plate-shaped portion 4M of the inner cover member 4 from the upper surface side (the surface side on the Z1 side) toward the lower surface side (the surface side on the Z2 side) of the second plate-shaped portion 4M. In addition, the two action portions 7P (the left action portion 7PL and the right action portion 7PR) each have a recessed portion DP provided between a pair of bent portions FD, and are configured so that the recessed portion DP can be pressed against the end of the protrusion 3T.

[0075] Specifically, the left action portion 7PL is configured to press the left recess DPL provided between a pair of left bending portions FDL against the left end portion LE of the protrusion 3T, and the right action portion 7PR is configured to press the right recess DPR provided between a pair of right bending portions FDR against the right end portion RE of the protrusion 3T.

[0076] That is, the two action parts 7P are respectively configured to move the protrusion 3T in one direction but not in the other direction. Specifically, the left action part 7PL is configured to move the protrusion 3T in the direction indicated by the arrow AR7 but not in the direction indicated by the arrow AR8. On the contrary, the right action part 7PR is configured to move the protrusion 3T in the direction indicated by the arrow AR8 but not in the direction indicated by the arrow AR7.

[0077] With this configuration, the drive mechanism DM can prevent the protrusion 3T from moving rightward along with the right-side action portion 7PR moving rightward (restoring to the initial position) when, for example, the supply of current to the right-side wire SAR is interrupted. Similarly, the drive mechanism DM can prevent the protrusion 3T from moving leftward along with the left-side action portion 7PL moving leftward (restoring to the initial position) when, for example, the supply of current to the left-side wire SAL is interrupted.

[0078] In the example shown in the figure, each of the six blade members 2 is arranged so as to partially contact the adjacent blade member 2 . Figure 4 The range with dot patterns in the second figure from the top represents the portion where two blade members 2 overlap and contact each other. With such an arrangement, the six blade members 2 can maintain the size of the aperture AP even when the supply of current to the shape memory alloy wire SA is interrupted or the supply of current to the shape memory alloy wire SA decreases. For example, Fig.10 As shown in the figure above, after the rotating member 3 is rotated clockwise when viewed from above, when the supply of current to the right wire SAR is interrupted, the right wire SAR is extended by the restoring force of the first right elastic arm portion 7FR and the second right elastic arm portion 7GR of the right leaf spring member 7R, and the right acting portion 7PR of the right leaf spring member 7R returns. Fig.10Even in this case, the blade drive device 101 can maintain the positions of the six blade components 2 as they are (maintained as they are) by utilizing the friction force acting on the contacting portions of the six blade components 2. Fig.10 Therefore, the blade drive device 101 can prevent the rotating member 3 from moving Fig.10 The initial position shown in the central figure is rotated to maintain the size of the aperture opening AP (maintaining the same Fig.10 With such a configuration, the blade drive device 101 can reduce power consumption compared to a configuration in which power must be continuously supplied in order to maintain the size of the aperture AP.

[0079] Next, refer to Fig.12 Another configuration example of the drive mechanism DM will be described. Fig.12 is a bottom view of the blade drive device 101 with the housing member 9 removed, corresponding to Fig.10 Specifically, Fig.12 The figure above is when the aperture AP is at its maximum open state, corresponding to Fig.10 In addition, Fig.12 The following figure shows the aperture AP at its minimum open state, corresponding to Fig.10 In addition, Fig.12 In the figure, for the sake of clarity, a dot pattern is added to the components through which current flows.

[0080] Fig.12 The driving mechanism DM shown in the figure is mainly different from the above-mentioned driving mechanism DM ( Fig.10 The drive mechanism DM) shown is different, but in other respects is the same Fig.10 Therefore, the description of the common parts will be omitted below, and the different parts will be described in detail.

[0081] Fig.12 The drive mechanism DM shown is roughly equivalent to Fig.10 The second driving mechanism DM2 in the driving mechanism DM shown. Specifically, Fig.12 The driving mechanism DM shown is composed of a left wire SAL, a left leaf spring member 7L, and a left metal member 8L.

[0082] Moreover, the composition Fig.12 The left leaf spring member 7L of the driving mechanism DM shown is configured to have a substantially rectangular ring-shaped left action portion 7PL having a through hole HL formed in a rounded rectangular shape surrounding the protrusion 3T corresponding to the size of the protrusion 3T as the receiving portion RP provided on the rotating member 3.

[0083] Through this composition, Fig.12 The driving mechanism DM shown can rotate the rotating member 3 in two directions (clockwise and counterclockwise, respectively, with respect to the rotation axis RX when viewed from below) via a single shape memory alloy wire SA.

[0084] In other words, Fig.12 The driving mechanism DM shown can adjust the aperture AP of the diaphragm between the maximum open state and the minimum open state by extending and contracting a shape memory alloy wire SA to rotate the rotating member 3 clockwise or counterclockwise within the range of an angle θ3.

[0085] As mentioned above, Figure 2 As shown, the blade drive device 101 of the embodiment of the present application has a fixed side part FB including a cover part 1, an inner cover part 4, a base part 5, a metal part 8 and a shell part 9, a rotating part 3 that can rotate relative to the fixed side part FB, a plurality of blade parts 2 that can be rotatably supported on the fixed side part FB (cover part 1) and rotate in conjunction with the rotation of the rotating part 3, and a driving mechanism DM that rotates the rotating part 3. In addition, as shown in FIG. Figure 1 As shown, the blade drive device 101 is constructed so that the plurality of blade components 2 rotate along with the rotation of the rotating component 3, respectively, thereby changing the size of the opening AP formed by the plurality of blade components 2. In addition, the drive mechanism DM is composed of a shape memory alloy wire SA and a leaf spring component 7. The fixed side component FB (metal component 8) has a first wire fixing portion 8W. The leaf spring component 7 has a base 7B fixed to the fixed side component FB (base component 5), an action portion 7P capable of moving a receiving portion RP provided on the rotating component 3, and a second wire fixing portion 7W provided between the base 7B and the action portion 7P. Moreover, as Figure 8 As shown in FIG. 1 , the second wire fixing portion 7W is arranged at a position different from the first wire fixing portion 8W in the axial direction (Z-axis direction) along the rotation axis RX of the rotating member 3. Figure 8 In the example shown in FIG. 1 , the second wire fixing portion 7W is arranged at a position farther from the rotating member 3 than the first wire fixing portion 8W in the axial direction (Z-axis direction). Figure 8 As shown, the shape memory alloy wire SA is configured such that one end is fixed to the first wire fixing portion 8W and the other end is fixed to the second wire fixing portion 7W, and is in a straight line when current is supplied, and the position (height HT11) of the second wire fixing portion 7W in the axial direction when current is supplied is different from the position (height HT1) of the second wire fixing portion 7W in the axial direction when no current is supplied. Figure 8 In the example shown, the shape memory alloy wire SA is configured as follows Figure 8The position (height HT11) of the second wire fixing portion 7W in the axial direction when current is supplied as shown in the following figure is Figure 8 The position (height HT1) of the second wire fixing portion 7W in the axial direction when no current is supplied as shown in the center figure is closer to the rotating member 3.

[0086] This configuration has an effect of preventing damage such as disconnection of the shape memory alloy due to long-term use, compared with a configuration in which the shape memory alloy has a folded portion.

[0087] In addition, if Figure 2 As shown, the rotating member 3 may also have a first plate-shaped portion 3M having a through portion (opening 3K) that penetrates along the axial direction (Z-axis direction). In this case, the blade member 2 may also be arranged on one side (Z1 side) of the first plate-shaped portion 3M, and the driving mechanism DM may also be arranged on the other side (Z2 side) of the first plate-shaped portion 3M.

[0088] This arrangement brings about an effect of suppressing interference between the blade member 2 and the drive mechanism DM, compared with a case where the blade member 2 and the drive mechanism DM are arranged on the same side when viewed from the first plate-shaped portion 3M.

[0089] In addition, if Figure 6 As shown, the receiving portion RP may be constituted by a protruding portion 3T protruding from the first plate-shaped portion 3M of the rotating member 3 toward the other surface side (Z2 side).

[0090] This configuration brings about an effect that the rotating member 3 can be reliably driven by the driving mechanism DM with a simple structure.

[0091] In addition, if Figure 7 As shown, the base 7B, the first wire fixing portion 8W, and the action portion 7P may be arranged on different sides of a virtual straight line L1 connecting the second wire fixing portion 7W and the rotation axis RX when viewed along the axial direction (Z-axis direction). Figure 7 In the example shown, the right side base 7BR, the first right side wire fixing portion 8WR, and the right side action portion 7PR are arranged on different sides of the right side virtual straight line L1R, and the left side base 7BL, the first left side wire fixing portion 8WL, and the left side action portion 7PL are arranged on different sides of the left side virtual straight line L1L.

[0092] This arrangement brings about an effect of improving the space efficiency in the housing HS, compared with a configuration in which the base 7B, the first wire fixing portion 8W, and the action portion 7P are all arranged on the same side with respect to the virtual straight line L1, or a configuration in which the base 7B, the first wire fixing portion 8W, and the action portion 7P are arranged on different sides with respect to the virtual straight line L1. In other words, this arrangement brings about an effect of accommodating the drive mechanism DM in a relatively small space.

[0093] In addition, if Figure 8 As shown in the central figure, a first elastic arm portion 7F capable of elastic deformation may be provided between the base portion 7B and the second wire fixing portion 7W. In addition, a second elastic arm portion 7G capable of elastic deformation may be provided between the action portion 7P and the second wire fixing portion 7W. Moreover, in the axial direction (Z-axis direction), the first wire fixing portion 8W and the action portion 7P may be arranged at a position closer to the first plate-shaped portion 3M of the rotating member 3 than the second wire fixing portion 7W. In addition, Figure 8 In the example shown in the center figure of FIG, when the current is not supplied to the shape memory alloy wire SA, the base portion 7B is arranged at a position closer to the first plate-shaped portion 3M than the second wire fixing portion 7W, but may be arranged at a position farther from the first plate-shaped portion 3M than the second wire fixing portion 7W. Alternatively, the base portion 7B and the second wire fixing portion 7W may be arranged at positions at substantially the same distance from the first plate-shaped portion 3M.

[0094] This configuration enables, with a simple structure, the second wire fixing portion 7W to be restored to the initial position ( Figure 8 This effect is achieved by moving the cursor in the center of the image.

[0095] In addition, if Fig.11 As shown, the fixed side member FB (inner cover member 4) may also include a second plate-shaped portion 4M disposed on the other side (Z2 side) of the first plate-shaped portion 3M of the rotating member 3 and having a through portion (second through hole 4H2) through which the receiving portion RP is exposed. In this case, the action portion 7P may also be configured to slide on the surface of the second plate-shaped portion 4M.

[0096] This configuration brings about an effect of making the movement of the action portion 7P in the circumferential direction smoother, compared with a configuration in which a member such as the second plate-shaped portion 4M for sliding the action portion 7P is not provided.

[0097] In addition, if Figure 8 As shown in the central figure, the drive mechanism DM can also be constructed so that the distance DS1 between the second wire fixing part 7W and the first wire fixing part 8W in the axial direction (Z-axis direction) is larger than the distance DS2 between the second wire fixing part 7W and the base 7B in the axial direction.

[0098] This configuration brings about an effect of increasing the amount of movement of the action portion 7P accompanying the contraction of the shape memory alloy wire SA, compared to a case where the distance DS1 is equal to or smaller than the distance DS2.

[0099] In addition, if Figure 2 As shown, the plurality of blade members 2 may also respectively include a first engaged portion (first through hole 2H1) engaged with a first engaging portion (convex portion 1P) provided on the fixed side member FB (cover member 1), and a second inner engaged portion (second through hole 2H2) engaged with a second engaging portion (convex portion 3P) provided on the rotating member 3. Figure 3 As shown, the fixed side member FB (cover member 1) may also have a second outer engaged portion (through hole 1H) engaged with a second engaging portion (convex portion 3P) provided on the rotating member 3. Furthermore, the plurality of blade members 2 may also be configured to rotate relative to the fixed side member FB (cover member 1) in conjunction with the rotation of the rotating member 3 relative to the fixed side member FB (cover member 1).

[0100] This configuration brings about an effect that the size of the aperture AP formed by the plurality of blade members 2 can be changed with a simple structure.

[0101] In addition, if Fig. 9 As shown, the drive mechanism DM may also include a first drive mechanism DM1 that rotates the rotating part 3 in one direction (clockwise relative to the rotation axis RX when viewed from above), and a second drive mechanism DM2 that rotates the rotating part 3 in the other direction (counterclockwise relative to the rotation axis RX when viewed from above). In this case, the first drive mechanism DM1 may also be composed of a first shape memory alloy wire (right side wire SAR) and a first leaf spring component (right side leaf spring component 7R), and the second drive mechanism DM2 may also be composed of a second shape memory alloy wire (left side wire SAL) and a second leaf spring component (left side leaf spring component 7L). In addition, as Fig. 9 As shown in the central figure, the supporting part RP provided on the rotating part 3 may also have a first supporting part RP1 and a second supporting part RP2. Furthermore, the first leaf spring part (right leaf spring part 7R) may also have a first base (right base 7BR) fixed to the fixed side part FB (base part 5), and a first action part (right action part 7PR) capable of moving the first supporting part RP1, and the second leaf spring part (left leaf spring part 7L) may also have a second base (left base 7BL) fixed to the fixed side part FB (base part 5), and a second action part (left action part 7PL) capable of moving the second supporting part RP2. In addition, the plurality of blade parts 2 may also respectively have portions that contact other blade parts 2. Figure 4In the example shown in the figure, a dot pattern is added to the portion where two adjacent blade members 2 overlap and contact. Fig.11 As shown, the first receiving portion RP1 (right end portion RE of the protrusion 3T) and the second receiving portion RP2 (left end portion LE of the protrusion 3T) are the same component (protrusion 3T), but they may be separate components.

[0102] The first drive mechanism DM1 and the second drive mechanism DM2 are provided. Fig.12 Compared with the structure shown in the figure, in which the rotating member 3 is rotated in two directions (clockwise and counterclockwise relative to the rotation axis RX when viewed from above), the size of the aperture AP formed by the plurality of blade members 2 can be relatively easily fine-tuned. In addition, even if the supply of current to the shape memory alloy wire SA is interrupted, the structure can maintain the current position of each of the plurality of blade members 2, thereby maintaining the size of the aperture AP formed by the plurality of blade members 2. Therefore, the structure can suppress power consumption.

[0103] In addition, if Fig. 9 As shown, the first bearing portion RP1 and the second bearing portion RP2 may also constitute the same part, namely the common bearing portion CRP. In this case, the first action portion (right action portion 7PR) and the second action portion (left action portion 7PL) may also be separated in the rotation direction of the rotating member 3 and face each other with the common bearing portion CRP between them.

[0104] This configuration brings about an effect of achieving miniaturization of the blade drive device 101, compared with a case where the first receiving portion RP1 and the second receiving portion RP2 are configured as separate parts.

[0105] Alternatively, the rotating member 3 may be formed of a metal plate, and at least the portion of the common receiving portion CRP that contacts the first action portion (right action portion 7PR) and the second action portion (left action portion 7PL) is formed of an insulating material. Figure 6 In the embodiment, a dot pattern is added to the portion of the common receiving portion CRP that may contact the first action portion (right action portion 7PR) and the second action portion (left action portion 7PL). Figure 6 In the example shown, this portion is coated with fluororesin.

[0106] This configuration has an effect of preventing the right side wire SAR and the left side wire SAL from being electrically connected via the common receiving portion CRP.

[0107] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Various modifications and substitutions can be applied to the above embodiments without departing from the scope of the present invention. In addition, the various features described with reference to the above embodiments can also be appropriately combined as long as there is no technical contradiction.

[0108] For example, in the above-described embodiment, the blade member 2 is composed of six blade members (first to sixth blade members 2A to 2F) having the same shape and size, but may be composed of two blade members having different shapes.

[0109] Description of Reference Numerals

[0110] 1…cover member, 1H…through hole, 1K…opening, 1P…convex portion, 2…blade member, 2A…first blade member, 2B…second blade member, 2C…third blade member, 2D…fourth blade member, 2E…fifth blade member, 2F…sixth blade member, 2H1…first through hole, 2H2…second through hole, 3…rotating member, 3H…through hole, 3K…opening, 3M…first plate-shaped portion, 3P…convex portion, 3T…protruding portion, 4…inner cover member, 4C…cylindrical portion, 4H1…first through hole, 4H2…second through hole, 4K…opening, 4M…second plate-shaped portion, 5…base member, 5B…base, 5C…notch portion, 5D…pedestal portion, 5P, 5Q …convex portion, 5R, 5S…recess, 6…conductive component, 6A…first conductive component, 6B…second conductive component, 6C…third conductive component, 7…leaf spring component, 7B…base, 7BL…left base, 7BR…right base, 7F…first elastic arm, 7FL…first left elastic arm, 7FR…first right elastic arm, 7G…second elastic arm, 7GL…second left elastic arm, 7GR…second right elastic arm, 7H1…first through hole, 7H2…second through hole, 7L…left leaf spring component, 7P…acting portion, 7PL…left acting portion, 7PR…right acting portion, 7R…right leaf spring component, 7W…second wire fixing portion, 7WL…second left Side wire fixing portion, 7WR…Second right side wire fixing portion, 8…Metal component, 8H1…First through hole, 8H2…Second through hole, 8L…Left side metal component, 8R…Right side metal component, 8W…First wire fixing portion, 8WL…First left side wire fixing portion, 8WR…First right side wire fixing portion, 9…Casing component, 9C…Cylinder-shaped portion, 9K…Opening, 9M…Third plate-shaped portion, 101…Blade driving device, AP…Opening, CRP…Common bearing portion, CS…Connection portion, CS1…First connection portion, CS2…Second connection portion, CS3…Third connection portion, CS3L…Third left side connection portion, CS3R…Third right side connection portion, DM…Drive mechanism, DM1…First drive Mechanism, DM2…second driving mechanism, DP…recess, DPL…left recess, DPR…right recess, EP…buried portion, EP1…first buried portion, EP2…second buried portion, EP3…third buried portion, FB…fixed side component, FD…bending portion, FDL…left bending portion, FDR…right bending portion, HL…through hole, HS…box, LE…left end portion, RE…right end portion, RP…supporting portion, RP1…first supporting portion, RP2…second supporting portion, RX…rotation axis, SA…shape memory alloy wire, SAL…left wire, SAR…right wire, TM…terminal portion, TM1…first terminal portion, TM2…second terminal portion, TM3…third terminal portion.

Claims

1. A blade driving device, comprising: Fixed side parts; A rotating component capable of rotating relative to the fixed side component; a plurality of blade members rotatably supported by the fixed-side member and rotating in conjunction with the rotation of the rotating member; as well as A driving mechanism causes the rotating member to rotate, The blade driving device rotates the plurality of blade members in accordance with the rotation of the rotating member, thereby changing the size of the opening formed by the plurality of blade members. The blade driving device is characterized in that: The driving mechanism is composed of a shape memory alloy wire and a leaf spring component. The fixed side member has a first wire fixing portion, The leaf spring member includes a base portion fixed to the fixed-side member, an action portion capable of moving a receiving portion provided on the rotating member, and a second wire fixing portion provided between the base portion and the action portion. The second wire fixing portion is arranged at a position different from the first wire fixing portion in the axial direction along the rotation axis of the rotating member. The shape memory alloy wire is configured such that one end is fixed to the first wire fixing portion and the other end is fixed to the second wire fixing portion, and is in a straight line when current is supplied, and the position of the second wire fixing portion in the axial direction when current is supplied is different from the position of the second wire fixing portion in the axial direction when no current is supplied.

2. The blade driving device according to claim 1, wherein: The rotating member includes a first plate-shaped portion having a through portion extending therethrough in the axial direction. The blade member is arranged on one side of the first plate-shaped portion. The driving mechanism is arranged on the other surface side of the first plate-shaped portion.

3. The blade driving device according to claim 2, wherein: The receiving portion is constituted by a protruding portion protruding from the first plate-shaped portion of the rotating member toward the other surface side.

4. The blade driving device according to claim 2, wherein: The base portion, the first wire fixing portion, and the action portion are arranged on different sides from each other across a virtual straight line connecting the second wire fixing portion and the rotation axis when viewed along the axial direction.

5. The blade driving device according to claim 2, wherein: A first elastic arm portion capable of elastic deformation is provided between the base portion and the second wire fixing portion. A second elastic arm portion capable of elastic deformation is provided between the action portion and the second wire fixing portion. The first wire fixing portion and the action portion are arranged at positions closer to the first plate-shaped portion of the rotating member than the second wire fixing portion in the axial direction.

6. The blade driving device according to claim 2, wherein: The fixed side member is arranged on the other side of the first plate-shaped portion of the rotating member and has a second plate-shaped portion having a through portion through which the receiving portion is exposed. The action portion is configured to slide on the surface of the second plate-shaped portion.

7. The blade drive device according to any one of claims 1 to 6, wherein: A distance between the second wire fixing portion and the first wire fixing portion in the axial direction is greater than a distance between the second wire fixing portion and the base portion in the axial direction.

8. The blade driving device according to claim 2, wherein: The plurality of blade members each include a first engaged portion engaged with a first engaging portion provided on the fixed side member, and a second inner engaged portion engaged with a second engaging portion provided on the rotating member. The fixed side member has a second outer engaged portion engaged with the second engaging portion provided on the rotating member. The plurality of blade members are configured to rotate relative to the stationary-side member in conjunction with the rotation of the rotating member relative to the stationary-side member.

9. The blade drive device according to any one of claims 1 to 6, wherein: The driving mechanism includes a first driving mechanism for rotating the rotating member in one direction and a second driving mechanism for rotating the rotating member in another direction. The first driving mechanism is composed of a first shape memory alloy wire and a first leaf spring component. The second driving mechanism is composed of a second shape memory alloy wire and a second leaf spring member. The receiving portion provided on the rotating member includes a first receiving portion and a second receiving portion. The first leaf spring member includes a first base portion fixed to the fixed-side member and a first action portion capable of moving the first receiving portion. The second leaf spring member includes a second base portion fixed to the fixed-side member and a second action portion capable of moving the second receiving portion. Each of the plurality of blade members has a portion in contact with other blade members.

10. The blade driving device according to claim 9, wherein: The first bearing part and the second bearing part constitute the same part, namely a common bearing part. The first acting portion and the second acting portion are opposed to each other with the common receiving portion interposed therebetween in a state where they are separated in the rotation direction of the rotating member.

11. The blade driving device according to claim 10, wherein: The rotating member is formed of a metal plate, and at least a portion of the common receiving portion that is in contact with each of the first acting portion and the second acting portion is formed of an insulating material.

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