Blade driving device

Abstract

To provide a blade driving device which can suppress damage to a shape memory alloy.SOLUTION: In a blade driving device 101, a size of an aperture AP formed by a plurality of blade members 2 rotated with rotation of a rotary member 3 varies. A driving mechanism DM for rotating the rotary member 3 has a shape memory alloy wire SA and a leaf spring member 7. The leaf spring member 7 has an action portion 7P for moving a receiving portion RP provided on the rotary member 3, and a second wire fixing portion 7W provided between a base 7B and the action portion 7P. The second wire fixing portion 7W is arranged at a position different from the first wire fixing portion 8W in a Z-axis direction. The shape memory alloy wire SA has one end fixed to the first wire fixing portion 8W and the other end fixed to the second wire fixing portion 7W. The second wire fixing portion 7W is configured so that a height HT11 when a current is supplied differs from a height HT1 when the current is not supplied.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to an impeller drive device. [Background technology]

[0002] Conventionally, a blade drive device is known that uses a shape memory alloy to operate multiple blades to change the diameter of an aperture formed by the multiple 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 that extend along the circumferential direction of the ring member, and a folded portion that connects the inner peripheral portion and the outer peripheral portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-148842 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned device, when an electric current is supplied to the shape memory alloy, the shape memory alloy contracts and pulls the protrusion on the ring member, so there is a risk that the folded part, which pulls the protrusion, will break if used for a long period of time.

[0005] Therefore, it is desirable to provide a blade drive device that can prevent damage such as breakage of the shape memory alloy. [Means for solving the problem]

[0006] A blade drive device according to an embodiment of the present disclosure includes a fixed-side member, a rotating member rotatable relative to the fixed-side member, a plurality of blade members rotatably supported on the fixed-side member and rotating in conjunction with the rotation of the rotating member, and a drive mechanism that rotates the rotating member, and the size of an opening formed by the plurality of blade members changes as each of the plurality of blade members rotates with the rotation of the rotating member. The drive mechanism is configured with a shape memory alloy wire and a leaf spring member, the fixed-side member has a first wire fixing portion, and the leaf spring member has a base portion fixed to the fixed-side member and a spring portion fixed to the rotating member. The rotating member has an operating part capable of moving a receiving part provided therein, and a second wire fixing part provided between the base and the operating part, the second wire fixing part being arranged at a different position from the first wire fixing part in an axial direction along the rotation axis of the rotating member, and the shape memory alloy wire has one end fixed to the first wire fixing part and the other end fixed to the second wire fixing part, and is configured to be straight when current is supplied, and such that the position of the second wire fixing part in the axial direction when current is supplied is different from the position of the second wire fixing part in the axial direction when current is not supplied. Effect of the Invention

[0007] The above-described blade driving device can suppress the occurrence of damage to the shape memory alloy. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a top perspective view of a blade drive device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is an exploded perspective view of the blade drive device shown in FIG. [Diagram 3] 4 is a bottom view of the cover member, the blade member, and the rotating member. FIG. [Figure 4] FIG. 4 is a top view of the cover member, the blade member, and the rotating member. [Diagram 5] FIG. 2 is a bottom perspective view of the blade drive device shown in FIG. [Figure 6] 1 is a bottom perspective view of the rotating member, the base member, the conductive member, and the drive mechanism; FIG. [Figure 7] 4A and 4B are top and bottom views of a drive mechanism and a conductive member. [Figure 8] FIG. 4 is a left side view of the drive mechanism and the conductive member. [Figure 9] FIG. 2 is a bottom perspective view of the blade member, the rotating member, and the drive mechanism. [Figure 10] FIG. 4 is a bottom view of the blade drive device with a case member removed. [Figure 11] FIG. [Figure 12] FIG. 11 is a bottom view of another configuration example of the blade drive device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the blade drive device 101 according to the embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is an upper perspective view of the blade drive device 101 that functions as a variable aperture device. Specifically, the upper view of FIG. 1 is an upper perspective view of the blade drive device 101 when the aperture opening AP formed by six blade members 2 is in an intermediate open state, the center view of FIG. 1 is an upper perspective view of the blade drive device 101 when the aperture opening AP is in a minimum open state, and the lower view of FIG. 1 is an upper perspective view of the blade drive device 101 when the aperture opening AP is in a maximum open state. The intermediate open state is a state in which the size of the aperture opening AP (opening area or aperture diameter) is larger than that in the minimum open state and smaller than that in the maximum open state. In FIG. 1, a dot pattern is applied to the aperture AP for clarity.

[0010] In FIG. 1, 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. Furthermore, 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. In FIG. 1, 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 (rear side) of the blade drive device 101. Furthermore, 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. Moreover, the Z1 side of the blade drive device 101 corresponds to the upper side (subject side) of the blade drive device 101, and the Z2 side of the blade drive device 101 corresponds to the lower side (imaging element side) of the blade drive device 101. The same applies to the other figures.

[0011] In the illustrated example, the blade drive device 101 is configured to be mounted above (on the subject side) a fixed lens (not shown) and function as a variable aperture device. The blade drive device 101 may also be configured to be mounted above (on the subject side) a movable lens that is moved in the optical axis direction by an autofocus function and function as a variable aperture device. In this case, the movable lens may be a lens included in a lens drive device equipped with an image sensor shift type image stabilization function. The blade drive device 101 may also be configured to be moved together with the movable lens. Alternatively, the blade drive device 101 may be configured to be mounted inside a lens drive device equipped with a periscope type actuator and function as a variable aperture device.

[0012] Specifically, the blade drive device 101 has 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, as shown in FIG. 2, which is an exploded oblique view of the blade drive device 101.

[0013] 1, the cover member 1 is joined to the case member 9 by adhesive, welding, or the like to form the housing HS together with the case member 9. In the illustrated example, the cover member 1 is an annular member made of a metal plate and has an opening 1K.

[0014] The blade members 2 are members that constitute the diaphragm. In the illustrated example, the blade members 2 are flat members made of a metal plate, and include 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.

[0015] The rotating member 3 is a member that constitutes the aperture opening and closing mechanism, and is configured to be rotatable around a rotation axis RX shown in Fig. 1. In the illustrated example, the rotating member 3 includes a first plate-shaped portion 3M that is an annular member formed of a metal plate having an opening 3K.

[0016] The inner cover member 4 is a member that cooperates with the cover member 1 to form a space that houses 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. Specifically, as shown in Fig. 2, the inner cover member 4 has an annular second plate-shaped portion 4M and a cylindrical tubular portion 4C that extends from the inner edge of the second plate-shaped portion 4M along the rotation axis RX.

[0017] The base member 5 is a member that supports the drive mechanism DM. In the illustrated example, the base member 5 is a member that is formed by injection molding using a synthetic resin.

[0018] The drive mechanism DM is a mechanism for rotating the rotating member 3 around the rotation axis RX. In the illustrated example, the drive mechanism DM includes a leaf spring member 7, a metal member 8, and a shape memory alloy wire SA. As shown in Fig. 2, 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 enlarge the aperture AP of the aperture, and a second drive mechanism DM2 that rotates the rotating member 3 in the direction indicated by the arrow AR2 to narrow the aperture AP of the aperture.

[0019] The shape memory alloy wire SA is an example of a shape memory actuator and constitutes the drive mechanism DM. In the illustrated example, the shape memory alloy wire SA includes a right wire SAR constituting the first drive mechanism DM1 and a left wire SAL constituting the second drive mechanism DM2. When a current flows through the shape memory alloy wire SA, the temperature increases and the wire contracts in response to the increase in temperature. The drive mechanism DM can rotate the rotating member 3 by utilizing the contraction of the shape memory alloy wire SA.

[0020] The conductive member 6 is a member for conducting electricity. In the illustrated example, 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.

[0021] The leaf spring members 7 are members that constitute the drive mechanism DM. Specifically, the leaf spring members 7 include a right leaf spring member 7R that constitutes the first drive mechanism DM1, and a left leaf spring member 7L that constitutes the second drive mechanism DM2.

[0022] The metal members 8 are members that constitute the drive mechanism DM. Specifically, the metal members 8 include a right metal member 8R that constitutes the first drive mechanism DM1, and a left metal member 8L that constitutes the second drive mechanism DM2.

[0023] In the illustrated example, as shown in FIG. 2, the shape memory alloy wire SA is fixed at one end to the metal member 8 and at the other end to the leaf spring member 7. Specifically, the right side wire SAR is fixed at one end to the right side metal member 8R and at the other end to the right side leaf spring member 7R. Also, the left side wire SAL is fixed at one end to the left side metal member 8L and at the other end to the left side leaf spring member 7L. More specifically, the metal member 8 is formed with a first wire fixing portion 8W to which one end of the shape memory alloy wire SA is fixed, and the leaf spring member 7 is formed with a second wire fixing portion 7W to which the other end of the shape memory alloy wire SA is fixed. More specifically, the right side metal member 8R is formed with a first right side wire fixing portion 8WR to which one end of the right side wire SAR is fixed, and the right side leaf spring member 7R is formed with a second right side wire fixing portion 7WR to which the other end of the right side wire SAR is fixed. In addition, a first left wire fixing portion 8WL to which one end of the left wire SAL is fixed is formed on the left metal member 8L, and a second left wire fixing portion 7WL to which the other end of the left wire SAL is fixed is formed on the left leaf spring member 7L.

[0024] In this embodiment, the fixing of one end of the shape memory alloy wire SA by the metal member 8 is realized by bending a part of the metal member 8 formed of a metal plate so as to sandwich one end of the shape memory alloy wire SA. Therefore, the first wire fixing part 8W is a clamping part that sandwiches one end of the shape memory alloy wire SA. Furthermore, the fixing of the other end of the shape memory alloy wire SA by the leaf spring member 7 is realized by bending a part of the leaf spring member 7 formed of a metal plate so as to sandwich the other end of the shape memory alloy wire SA. Therefore, the second wire fixing part 7W is a clamping part that sandwiches the other end of the shape memory alloy wire SA. The fixing of the shape memory alloy wire SA to the metal member 8 or the leaf spring member 7 may be realized by an adhesive, or may be reinforced by an adhesive.

[0025] The case member 9 is a member that constitutes a part of the housing HS, and is joined to the cover member 1 by adhesive, welding, or the like to constitute the housing HS together with the cover member 1, as shown in Fig. 1. In the illustrated example, the case member 9 is a cylindrical member made of metal and has an opening 9K. Specifically, as shown in Fig. 2, the case member 9 has an annular third plate-shaped portion 9M and a cylindrical tubular portion 9C that extends from the outer edge of the third plate-shaped portion 9M along the rotation axis RX.

[0026] As shown in FIG. 2, the cover member 1, the blade member 2, the rotating member 3, and the inner cover member 4 are assembled by engaging the engaging portion and the engaged portion provided on each member. Specifically, the cover member 1 has six protruding portions 1P protruding downward from the lower surface as engaging portions, and six rounded rectangular (long hole shaped) through holes 1H as engaged portions. Each of the six blade members 2 has a circular first through hole 2H1 and a rounded rectangular second through hole 2H2 as engaged portions. The rotating member 3 has six protruding portions 3P protruding upward from the upper surface of the first plate-shaped portion 3M as engaging portions, and six rounded rectangular through holes 3H as engaged portions. The inner cover member 4 has six circular first through holes 4H1 formed in the second plate-shaped portion 4M as engaged portions. The engaging portion (protrusion) and the engaged portion (through hole) in the illustrated example may be replaced with an engaged portion (through hole) and an engaging portion (protrusion), respectively.

[0027] More specifically, the six protrusions 1P of the cover member 1 are inserted into 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, as shown by the dashed line DL1 in Fig. 2, and are configured to be substantially immovable relative to the first through hole 2H1 and the first through hole 4H1 inside the first through hole 2H1 and the first through hole 4H1, respectively, and to be movable relative to the through hole 3H inside the through hole 3H. Also, the protrusions 3P of the rotating member 3 are inserted into the second through hole 2H2 of the blade member 2 and the through hole 1H of the cover member 1, as shown by the dashed line DL2 in Fig. 2, and are configured to be movable relative to the second through hole 2H2 and the through hole 1H inside the second through hole 2H2 and the through hole 1H, respectively.

[0028] Here, with reference to FIG. 3 and FIG. 4, the details of the positional relationship between the cover member 1, the blade member 2, the rotating member 3, and the inner cover member 4 will be described. FIG. 3 is a bottom view of the cover member 1, the blade member 2, and the rotating member 3. In FIG. 3, for clarity, only the convex portion 3P of the rotating member 3 is shown by a broken line. Specifically, the upper left view, the center left view, and the lower left view of FIG. 3 show the cover member 1 and the rotating member 3 in a state where the blade member 2 is not attached, and the upper right view, the center right view, and the lower right view of FIG. 3 show the cover member 1 and the rotating member 3 in a state where the blade member 2 is attached. The upper left view corresponds to the upper right view, the center left view corresponds to the center right view, and the lower left view corresponds to the lower right view. The upper left view and the upper right view are views when the aperture AP of the aperture is in a middle open state, the center left view and the center right view are views when the aperture AP of the aperture is in a maximum open state, and the lower left view and the lower right view are views when the aperture AP of the aperture is in a minimum open state.

[0029] FIG. 4 is a top view of the cover member 1, the blade member 2, and the rotating member 3. Specifically, the topmost view in FIG. 4 is a top view of the rotating member 3 and the cover member 1 to which the blade member 2 is not attached, and the second view from the top, the third view from the top, and the bottommost view in FIG. 4 are top views of the rotating member 3 and the cover member 1 to which the blade member 2 is attached. In FIG. 4, for clarity, only the protrusion 1P of the cover member 1 is shown by a broken line. In addition, the topmost view and the second view from the top in FIG. 4 are views when the aperture AP of the diaphragm is in a middle open state, and correspond to the upper left view and the upper right view in FIG. 3. In addition, the third view from the top in FIG. 4 is a view when the aperture AP of the diaphragm is in a maximum open state, and correspond to the left center view and the right center view in FIG. 3. The bottommost view in FIG. 4 is a view when the aperture AP of the diaphragm is in a minimum open state, and correspond to the left bottom view and the right bottom view in FIG. 3. Moreover, the area marked with a dot pattern in the second drawing from the top of FIG. 4 indicates the portion where two adjacent blade members 2 overlap and contact each other.

[0030] More specifically, as shown in the right center diagram of Figure 3, when the rotating member 3 rotates clockwise about the rotation axis RX when viewed from below by an angle θ1 from the state shown in the upper right diagram of Figure 3, the convex portion 3P of the rotating member 3 moves to the right in the diagram within the second through hole 2H2 of the fourth blade member 2D, and the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction indicated by arrow AR3.

[0031] That is, as shown in the third diagram from the top in Figure 4, when the rotating member 3 rotates counterclockwise about the rotation axis RX in a top view from the state shown in the second diagram from the top in Figure 4 by an angle θ1, the convex portion 3P of the rotating member 3 moves to the left in the figure within the second through hole 2H2 of the fourth blade member 2D, and the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction indicated by the arrow AR3.

[0032] The same is true for 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 becomes large until it reaches the maximum open state.

[0033] Conversely, as shown in the lower diagram of Figure 3, when the rotating member 3 rotates counterclockwise about the rotation axis RX when viewed from below by an angle θ2 from the state shown in the upper right diagram of Figure 3, the convex portion 3P of the rotating member 3 moves to the left in the diagram within the second through hole 2H2 of the fourth blade member 2D, and the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction indicated by arrow AR4.

[0034] That is, as shown in the bottom diagram of Figure 4, when the rotating member 3 rotates clockwise about the rotation axis RX in a top view from the state shown in the second diagram from the top of Figure 4 by an angle θ2, the convex portion 3P of the rotating member 3 moves to the right in the diagram within the second through hole 2H2 of the fourth blade member 2D, and the fourth blade member 2D rotates around the corresponding convex portion 1P in the direction indicated by the arrow AR4.

[0035] The same is true for 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 becomes smaller until it reaches the minimum open state.

[0036] Next, the path of the current flowing through the shape memory alloy wire SA will be described with reference to Figs. 5 to 7. Fig. 5 is a bottom perspective view of the blade drive device 101. Specifically, the upper view of Fig. 5 is a bottom perspective view of the blade drive device 101 with the case member 9 attached, the center view of Fig. 5 is a bottom perspective view of the blade drive device 101 with the case member 9 removed, and the lower view of Fig. 5 is a bottom perspective view of the blade drive device 101 with the cover member 1 and the inner cover member 4 further removed. Fig. 6 is a bottom perspective view of the rotating member 3, the base member 5, the conductive member 6, and the drive mechanism DM. Fig. 7 is a diagram showing the positional relationship between the drive mechanism DM and the conductive member 6 when the drive mechanism DM and the conductive member 6 are combined with each other. Specifically, the upper view of Fig. 7 is a top view of the drive mechanism DM and the conductive member 6, and the lower view of Fig. 7 is a bottom view of the drive mechanism DM and the conductive member 6. In addition, in FIG. 7, for clarity, a dot pattern is applied to the leaf spring member 7 and the metal member 8 that configure the drive mechanism DM.

[0037] As shown in Fig. 6, the rotating member 3 has a protrusion 3T that protrudes downward from the lower surface of the first plate-shaped portion 3M. The protrusion 3T constitutes a receiving portion RP that receives a force (pressing force) generated by the drive mechanism DM. In the illustrated example, the protrusion 3T is formed by bending a part of the first plate-shaped portion 3M downward. Note that in Fig. 6, for clarity, a dot pattern is applied to the protrusion 3T serving as the receiving portion RP.

[0038] 6, the base member 5 has an annular, flat base portion 5B and a partially annular pedestal portion 5D protruding downward from the inner edge of the base portion 5B. A cutout portion 5C is formed in the base portion 5B to allow the protrusion 3T serving as the receiving portion RP to pass therethrough.

[0039] 6, the conductive member 6 includes a buried portion EP buried in the base member 5, a connection portion CS exposed on the lower surface of the base member 5, and a terminal portion TM provided so as to protrude downward from the base member 5. Specifically, the conductive member 6 includes a first conductive member 6A to a third conductive member 6C. The first conductive member 6A includes a first buried portion EP1, a first connection portion CS1, and a first terminal portion TM1, the second conductive member 6B includes a second buried portion EP2, a second connection portion CS2, and a second terminal portion TM2, and the third conductive member 6C includes a third buried portion EP3, a third connection portion CS3, and a third terminal portion TM3. The third connection portion CS3 includes a third left connection portion CS3L and a third right connection portion CS3R.

[0040] The first connection portion CS1 and the second connection portion CS2 are arranged so as to be exposed at the position of the recess 5S on 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 arranged so as to be exposed at the position of the recess 5R on the lower surface of the pedestal portion 5D of the base member 5.

[0041] 6, the leaf spring member 7 has a base portion 7B fixed to the base member 5, an action portion 7P capable of pushing and moving 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. The leaf spring member 7 also has an elastically deformable first elastic arm portion 7F provided between the base portion 7B and the second wire-fixing portion 7W, and an elastically deformable second elastic arm portion 7G provided between the action portion 7P and the second wire-fixing portion 7W.

[0042] Specifically, the left side leaf spring member 7L has a left side base 7BL, a left side acting portion 7PL, a second left side wire fixing portion 7WL, a first left side elastic arm portion 7FL, and a second left side elastic arm portion 7GL, and the right side leaf spring member 7R has a right side base 7BR, a right side acting portion 7PR, a second right side wire fixing portion 7WR, a first right side elastic arm portion 7FR, and a second right side elastic arm portion 7GR.

[0043] 6, each of the bases 7B has two first through holes 7H1 through which two cylindrical protrusions 5P formed to protrude downward from the lower surface of the pedestal portion 5D of the base member 5 are inserted. In the illustrated example, the base member 5 and each of the bases 7B are joined by hot crimping or cold crimping the two protrusions 5P inserted into the two first through holes 7H1. However, the base member 5 and each of the bases 7B may be joined by an adhesive.

[0044] Further, as shown in FIG. 6, each of the bases 7B has a second through hole 7H2 formed in the center. The second through hole 7H2 is used when joining the base 7B and the conductive member 6. In the illustrated example, the second through hole 7H2 is used when joining the base 7B and the third connection portion CS3 of the conductive member 6. The joining between the base 7B and the third connection portion CS3 is realized by laser welding. However, the joining between the base 7B and the third connection portion CS3 may be realized by solder or a conductive adhesive. In the illustrated example, the left base portion 7BL of the left leaf spring member 7L is joined to the third left connection portion CS3L of the third conductive member 6C by laser welding, and the right base portion 7BR of the right leaf spring member 7R is joined to the third right connection portion CS3R of the third conductive member 6C by laser welding.

[0045] Each of the action parts 7P is arranged so as to be able to circumferentially press the protrusion 3T as the receiving part RP in the cutout part 5C of the base member 5. In the illustrated example, each of the action parts 7P is arranged so as to slide on the lower surface of the second plate-shaped part 4M of the inner cover member 4 and come into contact with the protrusion 3T as the receiving part RP when a current is supplied to the corresponding shape memory alloy wire SA, as shown in the center diagram of FIG.

[0046] The metal members 8 are members fixed to the base member 5, and include a left metal member 8L and a right metal member 8R. As shown in FIG. 6, each of the metal members 8 has two first through holes 8H1 through which two cylindrical protrusions 5Q formed to protrude downward from the lower surface of the base 5B of the base member 5 are inserted. In the illustrated example, the base member 5 and each of the metal members 8 are joined by hot crimping or cold crimping the two protrusions 5Q inserted into the two first through holes 8H1. However, the base member 5 and the metal members 8 may be joined by an adhesive.

[0047] 6, a second through hole 8H2 is formed in the center of each of the metal members 8. The second through hole 8H2 is used when joining the metal members 8 and the conductive member 6. In the illustrated example, the joining of the metal members 8 and the conductive member 6 is realized by laser welding. However, the joining of the metal members 8 and the conductive member 6 may also be realized by solder or a conductive adhesive. In the illustrated example, the right metal member 8R is joined to the first connection portion CS1 of the first conductive member 6A by laser welding, and the left metal member 8L is joined to the second connection portion CS2 of the second conductive member 6B by laser welding.

[0048] In the configuration described above, when 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, a current flows through the first conductive member 6A (first terminal portion TM1, first embedded portion EP1, and first connection portion CS1), the right metal member 8R, the right wire SAR, the right leaf spring member 7R (second right wire fixing portion 7WR, first right elastic arm portion 7FR, and right base portion 7BR), and the third conductive member 6C (third right connection portion CS3R and third embedded portion EP3) to the third terminal portion TM3 of the third conductive member 6C, as shown by the dashed arrows in the upper diagram of FIG.

[0049] Furthermore, when the second terminal portion TM2 of the second conductive member 6B is connected to a high potential and the third terminal portion TM3 of the third conductive member 6C is connected to a low potential, current flows through the second conductive member 6B (second terminal portion TM2, second embedded portion EP2, and second connection portion CS2), the left metal member 8L, the left wire SAL, the left leaf spring member 7L (second left wire fixing portion 7WL, first left elastic arm portion 7FL, and left base portion 7BL), and the third conductive member 6C (third left connection portion CS3L and third embedded portion EP3) to the third terminal portion TM3 of the third conductive member 6C, as shown by the dashed-dotted arrow in the upper diagram of FIG.

[0050] Next, the movement of the drive mechanism DM will be described with reference to Figs. 8 to 10. Fig. 8 is a left side view of the second drive mechanism DM2. Specifically, the upper view of Fig. 8 is a left side view of the rotating member 3, the inner cover member 4, and the second drive mechanism DM2, and the center view and the bottom view of Fig. 8 are left side views of the rotating member 3 and the second drive mechanism DM2. The center view of Fig. 8 is a view showing a state when no current is supplied to the left wire SAL constituting the second drive mechanism DM2, and the bottom view of Fig. 8 is a view showing a state when current is supplied to the left wire SAL. Fig. 9 is a bottom perspective view of the blade member 2, the rotating member 3, and the drive mechanism DM. Specifically, the upper view of Fig. 9 is a view when the aperture AP of the aperture is in a maximum open state, the center view of Fig. 9 is a view when the aperture AP of the aperture is in a middle open state, and the bottom view of Fig. 9 is a view when the aperture AP of the aperture is in a minimum open state. Fig. 10 is a bottom view of the blade drive device 101 with the case member 9 removed. Specifically, the upper diagram in Fig. 10 shows the aperture AP in the maximum open state, the center diagram in Fig. 10 shows the aperture AP in the intermediate open state, and the lower diagram in Fig. 10 shows the aperture AP in the minimum open state. Note that in Figs. 9 and 10, for clarity, dot patterns are applied to members through which current flows.

[0051] The second drive mechanism DM2 is a mechanism for rotating the rotating member 3 around the rotation axis RX to reduce the aperture AP of the aperture, and as shown in FIG. 8, is composed of a left leaf spring member 7L, a left metal member 8L, and a left wire SAL.

[0052] In the illustrated example, as shown in the center diagram of Fig. 8, the left leaf spring member 7L is configured such that, when no current is supplied to the left wire SAL, the height HT1 of the second left wire fixing portion 7WL is greater than the height HT2 of the left action portion 7PL, greater than the height HT3 of the left base portion 7BL, and greater than the height HT4 of the first left wire fixing portion 8WL of the left metal member 8L. Note that the heights HT1, HT2, HT3, and HT4 refer to the distances to the lower surface of the first plate-shaped portion 3M of the rotating member 3 in the axial direction (Z-axis direction) along the rotation axis RX. The left leaf spring member 7L is also configured such that the distance DS1 between the second left wire fixing portion 7WL and the first left wire fixing portion 8WL in the axial direction is greater than the distance DS2 between the second left wire fixing portion 7WL and the left base portion 7BL in the axial direction.

[0053] When an electric current is supplied to the left wire SAL constituting the second drive mechanism DM2 including the left leaf spring member 7L configured as described above and the left wire SAL contracts, the first left elastic arm 7FL bends and the second left wire fixing part 7WL moves upward (in the Z1 direction, which is downward in the figure) along the rotation axis RX. When the second left wire fixing part 7WL moves upward, the second left elastic arm 7GL bends and the left action part 7PL slides on the surface (on the lower surface) of the second plate-shaped part 4M of the inner cover member 4 and moves in a direction away from the second left wire fixing part 7WL approximately along the circumference of a circle centered on the rotation axis RX.

[0054] Specifically, the second left wire fixing part 7WL moves from a position at height HT1 (see the center diagram in FIG. 8) to a position at height HT11 (see the lower diagram in FIG. 8) when no current is supplied to the left wire SAL. The block arrow in the lower diagram in FIG. 8 indicates that the second left wire fixing part 7WL has moved upward (in a direction toward the first plate-shaped part 3M of the rotating member 3). Note that the above explanation with reference to FIG. 8 relates to the second driving mechanism DM2 that rotates the rotating member 3 to reduce the aperture AP of the diaphragm, but it also applies similarly to the first driving mechanism DM1 that rotates the rotating member 3 to increase the aperture AP of the diaphragm.

[0055] From another perspective, when a current is supplied to the right wire SAR, as shown in the upper diagram of FIG. 9, the right action part 7PR moves while pushing the protruding part 3T as the receiving part RP in the direction indicated by the arrow AR5, and rotates the rotating member 3 by moving the protruding part 3T in the direction indicated by the arrow AR5. As a result, the blade member 2 rotates in response to the rotation of the rotating member 3, and the aperture AP of the diaphragm becomes larger. Similarly, when a current is supplied to the left wire SAL, as shown in the lower diagram of FIG. 9, the left action part 7PL moves while pushing the protruding part 3T as the receiving part RP in the direction indicated by the arrow AR6, and rotates the rotating member 3 by moving the protruding part 3T in the direction indicated by the arrow AR6. As a result, the blade member 2 rotates in response to the rotation of the rotating member 3, and the aperture AP of the diaphragm becomes smaller.

[0056] From another perspective, as shown in FIG. 10, when a current is supplied to the right wire SAR, as shown in the upper diagram of FIG. 10, the right action part 7PR moves while pushing the protrusion 3T as the receiving part RP clockwise about the rotation axis RX in a bottom view, and rotates the rotating member 3 by an angle θ1 by moving the protrusion 3T clockwise. The angle θ1 is a rotation angle about the rotation axis RX with respect to the rotating member 3 when no current is supplied to the shape memory alloy wire SA as shown in the center diagram of FIG. 10, that is, when the aperture AP of the aperture is in a middle open state. As a result, the blade member 2 rotates in response to the rotation of the rotating member 3, and the aperture AP of the aperture becomes larger. Similarly, when a current is supplied to the left wire SAL, as shown in the lower diagram of FIG. 10, the left action part 7PL moves while pushing the protrusion 3T as the receiving part RP counterclockwise about the rotation axis RX in a bottom view, and rotates the rotating member 3 by an angle θ2 by moving the protrusion 3T counterclockwise. The angle θ2 is a rotation angle about the rotation axis RX with respect to the rotating member 3 when no current is supplied to the shape memory alloy wire SA as shown in the center of Fig. 10, i.e., when the aperture AP of the aperture is in a half-open state. As a result, the blade members 2 rotate in response to the rotation of the rotating member 3, and the aperture AP of the aperture becomes smaller.

[0057] Here, with reference to Fig. 11, details of the action part 7P that comes into contact with the protrusion 3T as the receiving part RP provided on the rotating member 3 will be described. Fig. 11 is a bottom view of the action part 7P, and corresponds to an enlarged view of the area R1 surrounded by the dashed line in the central view of Fig. 10. Note that in Fig. 11, for clarity, a fine dot pattern is applied to the rotating member 3, and a coarse dot pattern is applied to the second plate-shaped part 4M of the inner cover member 4.

[0058] 11, the protrusion 3T provided on the rotating member 3 is disposed so as to penetrate from the upper surface side (Z1 side surface side) of the second plate-shaped portion 4M toward the lower surface side (Z2 side surface side) through the rounded rectangular second through-hole 4H2 formed in the second plate-shaped portion 4M of the inner cover member 4. Each of the two acting portions 7P (the left acting portion 7PL and the right acting portion 7PR) has a recess DP provided between a pair of bent portions FD, and is configured so that the recess DP can be pressed against the end of the protrusion 3T.

[0059] Specifically, the left side acting portion 7PL is configured to be able to press a left side recess DPL provided between a pair of left side bending portions FDL against the left end portion LE of the protrusion portion 3T, and the right side acting portion 7PR is configured to be able to press a right side recess DPR provided between a pair of right side bending portions FDR against the right end portion RE of the protrusion portion 3T.

[0060] That is, each of the two acting parts 7P is configured to be able to move the protrusion 3T in one direction but not in the other. Specifically, the left acting part 7PL is configured to be able to move the protrusion 3T in the direction indicated by the arrow AR7 but not in the direction indicated by the arrow AR8. Conversely, the right acting part 7PR is configured to be able to move the protrusion 3T in the direction indicated by the arrow AR8 but not in the direction indicated by the arrow AR7.

[0061] With this configuration, the drive mechanism DM can prevent the protrusion 3T from moving rightward with the rightward movement of the right working part 7PR (returning to the initial position) when, for example, the supply of current to the right wire SAR is interrupted. Similarly, the drive mechanism DM can prevent the protrusion 3T from moving leftward with the leftward movement of the left working part 7PL (returning to the initial position) when, for example, the supply of current to the left wire SAL is interrupted.

[0062] In the illustrated example, each of the six blade members 2 is arranged so as to be partially in contact with the adjacent blade member 2. The area with the dot pattern in the second top view of FIG. 4 indicates the portion where the two blade members 2 overlap and are in contact with each other. With such an arrangement, the six blade members 2 can maintain the size of the aperture AP of the diaphragm even when the supply of current to the shape memory alloy wire SA is interrupted or when the amount of current supplied to the shape memory alloy wire SA is reduced. For example, as shown in the upper view of FIG. 10, when the supply of current to the right wire SAR is interrupted after the rotating member 3 is rotated clockwise in the bottom view, the right wire SAR is stretched 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 action portion 7PR of the right leaf spring member 7R returns to the initial position shown in the center view of FIG. 10. Even in this case, the blade drive device 101 can maintain the position of each of the six blade members 2 as it is (as shown in the upper diagram of FIG. 10) due to frictional forces acting on the portions of each of the six blade members 2 that are in contact with one another. Therefore, the blade drive device 101 can prevent the rotating member 3 from rotating toward the initial position shown in the center diagram of FIG. 10, and can maintain the size of the iris opening AP (as shown in the upper diagram of FIG. 10). With this configuration, the blade drive device 101 can reduce power consumption compared to a configuration in which power must be continuously supplied to maintain the size of the iris opening AP.

[0063] Next, another configuration example of the drive mechanism DM will be described with reference to Fig. 12. Fig. 12 is a bottom view of the blade drive device 101 with the case member 9 removed, and corresponds to Fig. 10. Specifically, the upper view of Fig. 12 is a view when the aperture AP of the diaphragm is in the maximum open state, and corresponds to the upper view of Fig. 10. The lower view of Fig. 12 is a view when the aperture AP of the diaphragm is in the minimum open state, and corresponds to the lower view of Fig. 10. Note that in Fig. 12, for clarity, a dot pattern is added to the members through which current flows.

[0064] The driving mechanism DM shown in Fig. 12 differs from the above-mentioned driving mechanism DM (driving mechanism DM shown in Fig. 10) which is configured with two shape memory alloy wires SA mainly in that it is configured with one shape memory alloy wire SA, but in other respects it is the same as the driving mechanism DM shown in Fig. 10. Therefore, in the following, a description of the common parts will be omitted and the different parts will be described in detail.

[0065] The drive mechanism DM shown in Fig. 12 roughly corresponds to the second drive mechanism DM2 in the drive mechanism DM shown in Fig. 10. Specifically, the drive mechanism DM shown in Fig. 12 is composed of a left wire SAL, a left leaf spring member 7L, and a left metal member 8L.

[0066] The left leaf spring member 7L constituting the drive mechanism DM shown in Figure 12 is configured to have a left acting portion 7PL having an approximately rectangular annular shape with a rounded rectangular through hole HL formed to surround the protrusion 3T, the rounded rectangular through hole HL corresponding to the size of the protrusion 3T as the receiving portion RP provided on the rotating member 3.

[0067] With this configuration, the drive mechanism DM shown in FIG. 12 can rotate the rotating member 3 in two directions (clockwise and counterclockwise with respect to the rotation axis RX when viewed from below) using a single shape memory alloy wire SA.

[0068] In other words, the driving mechanism DM shown in Figure 12 can adjust the aperture opening AP of the aperture between the maximum opening state and the minimum opening state by expanding and contracting a single shape memory alloy wire SA and rotating the rotating member 3 clockwise or counterclockwise within the range of angle θ3.

[0069] As described above, the blade drive device 101 according to the embodiment of the present disclosure includes a fixed side member FB including a cover member 1, an inner cover member 4, a base member 5, a metal member 8, and a case member 9, a rotating member 3 rotatable with respect to the fixed side member FB, a plurality of blade members 2 rotatably supported by the fixed side member FB (cover member 1) and rotating in conjunction with the rotation of the rotating member 3, and a drive mechanism DM for rotating the rotating member 3, as shown in FIG. 1. The blade drive device 101 is configured such that the size of the opening AP formed by the plurality of blade members 2 changes as each of the plurality of blade members 2 rotates with the rotation of the rotating member 3, as shown in FIG. 1. The drive mechanism DM includes a shape memory alloy wire SA and a leaf spring member 7. The fixed side member FB (metal member 8) has a first wire fixing portion 8W. The leaf spring member 7 has a base portion 7B fixed to the fixed side member FB (base member 5), an action portion 7P capable of moving 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. As shown in Fig. 8, the second wire-fixing portion 7W is disposed 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. In the example shown in Fig. 8, the second wire-fixing portion 7W is disposed at a position farther away from the rotating member 3 in the axial direction (Z-axis direction) than the first wire-fixing portion 8W. As shown in Fig. 8, 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 linear when a current is supplied, and the position (height HT11) of the second wire fixing portion 7W in the axial direction when a current is supplied is different from the position (height HT1) of the second wire fixing portion 7W in the axial direction when a current is not supplied. In the example shown in Fig. 8, the shape memory alloy wire SA is configured such that the position (height HT11) of the second wire fixing portion 7W in the axial direction when a current is supplied as shown in the lower drawing of Fig. 8 is closer to the rotating member 3 than the position (height HT1) of the second wire fixing portion 7W in the axial direction when a current is not supplied as shown in the center drawing of Fig. 8.

[0070] This configuration has the advantage that damage such as breakage of the shape memory alloy caused by long-term use can be suppressed, as compared with a configuration in which the shape memory alloy has a folded portion.

[0071] 2, the rotating member 3 may have a first plate-shaped portion 3M having a through-hole (opening 3K) penetrating in the axial direction (Z-axis direction) formed therein. In this case, the blade member 2 may be disposed on one surface side (Z1 side) of the first plate-shaped portion 3M, and the driving mechanism DM may be disposed on the other surface side (Z2 side) of the first plate-shaped portion 3M.

[0072] This arrangement brings about the effect of suppressing interference between the blade member 2 and the drive mechanism DM, compared to a case in which the blade member 2 and the drive mechanism DM are arranged on the same side as viewed from the first plate-shaped portion 3M.

[0073] 6, the receiving portion RP may be formed of a protruding portion 3T that protrudes from the first plate-shaped portion 3M of the rotating member 3 toward the other surface side (Z2 side).

[0074] This configuration brings about the effect of ensuring reliable driving of the rotary member 3 by the drive mechanism DM with a simple structure.

[0075] Furthermore, the base 7B, the first wire fixing portion 8W, and the action portion 7P may be disposed 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) as shown in Fig. 7. Specifically, in the example shown in Fig. 7, the right side base 7BR, the first right side wire fixing portion 8WR, and the right side action portion 7PR are disposed 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 disposed on different sides of the left side virtual straight line L1L.

[0076] This arrangement has the effect of improving the space efficiency within the housing HS compared to a configuration in which the base 7B, the first wire-fixing portion 8W, and the acting portion 7P are all arranged on the same side of the imaginary straight line L1, or a configuration in which the base 7B, the first wire-fixing portion 8W, and the acting portion 7P are arranged on different sides of the imaginary straight line L1, etc. In other words, this arrangement has the effect of making it possible to accommodate the drive mechanism DM in a relatively small space.

[0077] As shown in the center diagram of FIG. 8, a first elastic arm 7F capable of elastic deformation may be provided between the base 7B and the second wire fixing portion 7W. A second elastic arm 7G capable of elastic deformation may be provided between the action portion 7P and the second wire fixing portion 7W. In the axial direction (Z-axis direction), the first wire fixing portion 8W and the action portion 7P may be disposed closer to the first plate-shaped portion 3M of the rotating member 3 than the second wire fixing portion 7W. In the example shown in the center diagram of FIG. 8, when no current is supplied to the shape memory alloy wire SA, the base 7B is disposed closer to the first plate-shaped portion 3M than the second wire fixing portion 7W, but may be disposed farther from the first plate-shaped portion 3M than the second wire fixing portion 7W. Alternatively, the base 7B and the second wire fixing portion 7W may be disposed at substantially the same distance from the first plate-shaped portion 3M.

[0078] This arrangement has the advantage that, with a simple structure, when the supply of current to the shape memory alloy wire SA is interrupted, the restoring force of the leaf spring member 7 can return the second wire fixing portion 7W to its initial position (the position shown in the central diagram of Figure 8).

[0079] 11, the fixed-side member FB (inner cover member 4) may have a second plate-shaped portion 4M that is disposed on the other surface (Z2 side) of the first plate-shaped portion 3M of the rotating member 3 and has a through-hole (second through-hole 4H2) that exposes the receiving portion RP. In this case, the action portion 7P may be configured to slide on the surface of the second plate-shaped portion 4M.

[0080] This configuration brings about the effect that the movement of the action portion 7P in the circumferential direction can be made smoother than a configuration that does not have a member such as the second plate-shaped portion 4M for sliding the action portion 7P.

[0081] In addition, as shown in the central diagram of Figure 8, the drive mechanism DM may be configured so that the distance DS1 between the second wire-fixing portion 7W and the first wire-fixing portion 8W in the axial direction (Z-axis direction) is greater than the distance DS2 between the second wire-fixing portion 7W and the base 7B in the axial direction.

[0082] This configuration brings about an effect that the amount of movement of the action portion 7P accompanying the contraction of the shape memory alloy wire SA can be made larger than when the distance DS1 is equal to or smaller than the distance DS2.

[0083] Each of the blade members 2 may have a first engaged portion (first through hole 2H1) that engages with a first engaging portion (convex portion 1P) provided on the fixed member FB (cover member 1) and a second inner engaged portion (second through hole 2H2) that engages with a second engaging portion (convex portion 3P) provided on the rotating member 3, as shown in FIG. 2. The fixed member FB (cover member 1) may have a second outer engaged portion (through hole 1H) that engages with a second engaging portion (convex portion 3P) provided on the rotating member 3, as shown in FIG. 3. The blade members 2 may be configured to rotate relative to the fixed member FB (cover member 1) in conjunction with the rotation of the rotating member 3 relative to the fixed member FB (cover member 1).

[0084] This configuration brings about the effect of making it possible to change the size of the aperture AP of the diaphragm formed by the plurality of blade members 2 with a simple structure.

[0085] 9, the drive mechanism DM may have a first drive mechanism DM1 that rotates the rotating member 3 in one direction (clockwise with respect to the rotation axis RX as viewed from below) and a second drive mechanism DM2 that rotates the rotating member 3 in the other direction (counterclockwise with respect to the rotation axis RX as viewed from below). In this case, the first drive mechanism DM1 may be configured to have a first shape memory alloy wire (right wire SAR) and a first leaf spring member (right leaf spring member 7R), and the second drive mechanism DM2 may be configured to have a second shape memory alloy wire (left wire SAL) and a second leaf spring member (left leaf spring member 7L). Also, the receiving portion RP provided on the rotating member 3 may have a first receiving portion RP1 and a second receiving portion RP2 as shown in the center diagram of FIG. The first leaf spring member (right leaf spring member 7R) may have a first base portion (right base portion 7BR) fixed to the fixed member FB (base member 5) and a first action portion (right action portion 7PR) capable of moving the first receiving portion RP1, and the second leaf spring member (left leaf spring member 7L) may have a second base portion (left base portion 7BL) fixed to the fixed member FB (base member 5) and a second action portion (left action portion 7PL) capable of moving the second receiving portion RP2. Each of the plurality of blade members 2 may have a portion that contacts the other blade members 2. In FIG. 4, a dot pattern is applied to the portion where two adjacent blade members 2 overlap and contact each other. In the illustrated example, as shown in FIG. 11, 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 part (protrusion 3T), but they may be separate independent parts.

[0086] Such a configuration including a first drive mechanism DM1 and a second drive mechanism DM2 has the advantage that it is relatively easy to finely adjust the size of the aperture AP formed by the multiple blade members 2, compared to a configuration in which a single drive mechanism DM rotates the rotating member 3 in two directions (clockwise and counterclockwise when viewed from below with respect to the rotation axis RX) as shown in Fig. 12. This configuration also has the advantage that it is possible to hold the current positions of the multiple blade members 2 and maintain the size of the aperture AP formed by the multiple blade members 2, even if the supply of current to the shape memory alloy wire SA is interrupted. Therefore, this configuration has the advantage of being able to reduce power consumption.

[0087] Furthermore, the first receiving portion RP1 and the second receiving portion RP2 may form a common receiving portion CRP that is one and the same part, as shown in Fig. 9. In this case, the first acting portion (right acting portion 7PR) and the second acting portion (left acting portion 7PL) may face each other with the common receiving portion CRP therebetween, in a state separated from each other in the rotation direction of the rotating member 3.

[0088] This configuration brings about the effect that the blade drive device 101 can be made smaller in size than when the first receiving portion RP1 and the second receiving portion RP2 are configured as separate independent parts.

[0089] The rotating member 3 may be made of a metal plate, and at least the portion of the common receiving part CRP that comes into contact with the first acting part (right acting part 7PR) and the second acting part (left acting part 7PL) may be made of an insulating material. In Fig. 6, a dot pattern is applied to the portion of the common receiving part CRP that may come into contact with the first acting part (right acting part 7PR) and the second acting part (left acting part 7PL). In the example shown in Fig. 6, this portion is coated with fluororesin.

[0090] This configuration brings about the effect of preventing electrical continuity between the right wire SAR and the left wire SAL via the common receiving part CRP.

[0091] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications and substitutions may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

[0092] For example, in the above-described embodiment, the blade member 2 is composed of six blade members (first blade member 2A to sixth blade member 2F) having the same shape and size, but it may also be composed of two blade members having different shapes. [Explanation of symbols]

[0093] REFERENCE SIGNS LIST 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 Projecting 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...Notched portion 5D...Pedestal portion 5P, 5Q...Convex portion 5R, 5S...Concave portion 6...Conductive member 6A...First conductive member 6B...Second conductive member 6C...Third conductive member 7...Leaf spring member 7B...Base 7BL...Left side base 7BR...Right side base 7F...First elastic arm portion 7FL...First left side elastic arm portion 7FR...First right side elastic arm portion 7G...Second elastic arm portion 7GL...Second left side elastic arm portion 7GR...Second right side elastic arm portion 7H1...First through hole 7H2...Second through hole 7L...Left side leaf spring member 7P...Acting portion 7PL...Left side acting portion 7PR···Right side acting part 7R···Right side leaf spring member 7W···Second wire fixing part 7WL···Second left side wire fixing part 7WR···Second right side wire fixing part 8···Metal member 8H1···First through hole 8H2···Second through hole 8L···Left side metal member 8R···Right side metal member 8W···First wire fixing part 8WL···First left side wire fixing part 8WR···First right side wire fixing part 9···Case member 9C···Cylindrical part 9K···Opening 9M···Third plate-shaped part 101···Blade drive device AP···Opening CRP···Common receiving part CS···Connection part CS1···First connection part CS2···Second connection part CS3···Third connection part CS3L···Third left side connection part CS3R...Third right-side connection part DM...Drive mechanism DM1...First drive mechanism DM2...Second drive mechanism DP...Recess DPL...Left-side recess DPR...Right-side recess EP...Buried part EP1...First buried part EP2...Second buried part EP3...Third buried part FB...Fixed-side memberFD···Bent part FDL···Left bent part FDR···Right bent part HL···Through hole HS···Housing LE···Left end RE···Right end RP···Receiving part RP1···First receiving part RP2···Second receiving part RX···Rotation axis SA···Shape memory alloy wire SAL··Left wire SAR··Right wire TM···Terminal part TM1···First terminal part TM2···Second terminal part TM3···Third terminal part

Claims

1. A fixed member; a rotating member rotatable relative to the fixed member; a plurality of blade members that are rotatably supported by the fixed member and rotate in conjunction with the rotation of the rotating member; A drive mechanism for rotating the rotating member, A blade drive device in which a size of an opening formed by the plurality of blade members changes as each of the plurality of blade members rotates in accordance with the rotation of the rotating member, The drive mechanism includes a shape memory alloy wire and a leaf spring member, the fixed member has a first wire fixing portion, the leaf spring member has a base portion fixed to the fixed 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 disposed at a position different from that of the first wire-fixing portion in an axial direction along a rotation axis of the rotating member, The shape memory alloy wire has one end fixed to the first wire fixing portion and the other end fixed to the second wire fixing portion, is straight when a current is supplied thereto, and is configured such that the position of the second wire fixing portion in the axial direction when a current is supplied thereto differs from the position of the second wire fixing portion in the axial direction when a current is not supplied thereto. A blade drive device characterized by the above.

2. The rotating member has a first plate-shaped portion having a through-portion penetrating therethrough in the axial direction, The blade member is disposed on one surface side of the first plate-shaped portion, The drive mechanism is disposed on the other surface side of the first plate-shaped portion. The blade drive device according to claim 1 .

3. The receiving portion is configured by a protruding portion protruding from the first plate-shaped portion of the rotating member to the other surface side. The blade drive device according to claim 2 .

4. the base portion, the first wire-fixing portion, and the action portion are disposed on different sides of a virtual line connecting the second wire-fixing portion and the rotation axis when viewed along the axial direction. The blade drive device according to claim 2 .

5. a first elastic arm portion that is elastically deformable is provided between the base portion and the second wire fixing portion, a second elastic arm portion that is elastically deformable is provided between the action portion and the second wire fixing portion, In the axial direction, the first wire-fixing portion and the action portion are disposed at a position closer to the first plate-shaped portion of the rotating member than the second wire-fixing portion. The blade drive device according to claim 2 .

6. the fixed-side member is disposed on the other surface side of the first plate-shaped portion of the rotating member and has a second plate-shaped portion formed with a through-hole through which the receiving portion is exposed, The action portion is configured to slide on the surface of the second plate-shaped portion. The blade drive device according to claim 2 .

7. 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; The blade drive device according to any one of claims 1 to 6.

8. Each of the plurality of blade members has a first engaged portion that engages with a first engaging portion provided on the fixed member, and a second inner engaged portion that engages with a second engaging portion provided on the rotating member, the fixed member has a second outer engaged portion that engages with the second engaging portion provided on the rotating member, The plurality of blade members are configured to rotate relative to the fixed-side member in conjunction with the rotation of the rotating member relative to the fixed-side member. The blade drive device according to claim 2 .

9. the drive mechanism includes a first drive mechanism that rotates the rotary member in one direction and a second drive mechanism that rotates the rotary member in the other direction; The first driving mechanism includes a first shape memory alloy wire and a first leaf spring member, the second drive mechanism includes a second shape memory alloy wire and a second leaf spring member; The receiving portion provided on the rotating member has a first receiving portion and a second receiving portion, the first leaf spring member has a first base portion fixed to the fixed-side member and a first acting portion capable of moving the first receiving portion, the second leaf spring member has a second base portion fixed to the fixed member and a second acting portion capable of moving the second receiving portion, Each of the plurality of blade members has a portion that contacts the other blade members. The blade drive device according to any one of claims 1 to 6.

10. The first receiving portion and the second receiving portion constitute a common receiving portion that is one and the same part, The first acting portion and the second acting portion are opposed to each other across the common receiving portion in a state separated from each other in a rotation direction of the rotating member. The blade drive device according to claim 9.

11. The rotating member is made of a metal plate, and at least a portion of the common receiving portion that contacts the first acting portion and the second acting portion is made of an insulating material. The blade drive device according to claim 10.

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