Blade driving device and method for manufacturing blade driving device

Abstract

This blade driving device (BD) includes: a fixed-side member (FB); a rotating member (5) that can rotate relative to the fixed-side member (FB); a drive mechanism (DM) that rotates the rotating member (5); and a plurality of blade members (3) that turn in conjunction with the rotation of the rotating member (5). The drive mechanism (DM) includes a coil (12) provided to the fixed-side member (FB), and a magnet (6) provided to the rotating member (5) and disposed so as to face the coil (12). The coil (12) is provided at a position closer to a rotation center (rotation axis RX) than the magnet (6).

Description

Blade drive device and method for manufacturing the same

[0001] The present disclosure relates to a blade drive device and a method for manufacturing the blade drive device.

[0002] Conventionally, a blade drive device is known that changes the diameter of an aperture formed by a plurality of blades by rotating a rotating member using a drive mechanism composed of a magnet and a coil arranged to face each other, thereby operating the plurality of blades (see Patent Document 1). In this device, the coil is provided on a fixed-side member, and the magnet is provided on the rotating member.

[0003] Specification of Chinese Patent Application Publication No. 115480433

[0004] However, in the above-described device, the coil is arranged at a position farther from the optical axis than the magnet. Therefore, the size of the coil becomes large, and the length of the conducting wire (wire rod) constituting the coil also becomes long, which may increase the conduction resistance.

[0005] Therefore, it is desirable to provide a blade drive device that can suppress the increase in the size of the coil.

[0006] A blade drive device according to an embodiment of the present disclosure includes a fixed-side member, a rotating member rotatable with respect to the fixed-side member, a drive mechanism for rotating the rotating member, and a plurality of blade members that rotate in conjunction with the rotation of the rotating member. The drive mechanism includes a coil provided on the fixed-side member and a magnet provided on the rotating member and arranged to face the coil. The coil is provided at a position closer to the rotation center than the magnet.

[0007] The above-described blade drive device can suppress an increase in the size of the coil.

[0008] Figure 1 is an overhead perspective view of a blade drive device according to an embodiment of the present disclosure. Figure 1 is an exploded perspective view of the blade drive device shown in Figure 1. Figure 1 is a perspective view of the second fixed member and coil constituting the blade drive device shown in Figure 1. Figure 1 is a bottom view of the blade support member and blade member constituting the blade drive device shown in Figure 1. Figure 1 is a top view of the blade member and rotating member constituting the blade drive device shown in Figure 1. Figures of the leaf spring, rotating member, first fixed member, and second fixed member. Figure 1 is a downward perspective view of the second fixed member and coil constituting the blade drive device shown in Figure 1. Figure 1 is a downward perspective view of the first fixed member, second fixed member, coil, substrate, and sensor constituting the blade drive device shown in Figure 1. Figure 1 is a downward perspective view of the rotating member and magnet constituting the blade drive device shown in Figure 1. Figure 1 is an overhead perspective view of the rotating member, magnetic member, support member, first fixed member, second fixed member, coil, substrate, and sensor constituting the blade drive device shown in Figure 1. Figure 1 is an overhead perspective view of the cover member, blade support member, blade member, leaf spring, rotating member, first fixed member, second fixed member, and substrate constituting the blade drive device shown in Figure 1. Figure 1 is a bottom view of the leaf spring, rotating member, magnet, magnetic member, support member, coil, and sensor that constitute the blade drive device shown in Figure 1. Figure 1 is a top view of the leaf spring, magnet, magnetic member, support member, first fixing member, second fixing member, coil, and sensor that constitute the blade drive device shown in Figure 1. Figure 1 is a cross-sectional view of the blade drive device shown in Figure 1.

[0009] Hereinafter, the blade drive device BD according to the embodiment of this disclosure will be described with reference to the drawings. Figure 1 is an upper perspective view of the blade drive device BD functioning as a variable aperture device. Specifically, the upper part of Figure 1 is an upper perspective view of the blade drive device BD when the aperture AP formed by the six blade members 3 is in the maximum open state, the middle part of Figure 1 is an upper perspective view of the blade drive device BD when the aperture AP is in the intermediate open state, and the lower part of Figure 1 is an upper perspective view of the blade drive device BD when the aperture AP is in the minimum open state. Note that in the lower part of Figure 1, the blade drive device BD is shown attached to the lens body LS. Also, in Figure 1, a dot pattern is added to the aperture AP for clarity.

[0010] In Figure 1, X1 represents one direction of the X-axis in the three-dimensional Cartesian coordinate system, and X2 represents the other direction of the X-axis. Similarly, Y1 represents one direction of the Y-axis in the three-dimensional Cartesian coordinate system, and Y2 represents the other direction of the Y-axis. Likewise, Z1 represents one direction of the Z-axis in the three-dimensional Cartesian coordinate system, and Z2 represents the other direction of the Z-axis. In Figure 1, the X1 side of the blade drive unit BD corresponds to the front side of the blade drive unit BD, and the X2 side of the blade drive unit BD corresponds to the rear side of the blade drive unit BD. Also, the Y1 side of the blade drive unit BD corresponds to the left side of the blade drive unit BD, and the Y2 side of the blade drive unit BD corresponds to the right side of the blade drive unit BD. Furthermore, the Z1 side of the blade drive unit BD corresponds to the upper side (subject side) of the blade drive unit BD, and the Z2 side of the blade drive unit BD corresponds to the lower side (image sensor side) of the blade drive unit BD. The same applies to the other figures.

[0011] In the illustrated example, the blade drive unit BD is mounted on the upper side (subject side) of the fixed lens body LS, as shown in the lower diagram of Figure 1, and is positioned to function as a variable aperture device. Alternatively, the blade drive unit BD may be mounted on the upper side (subject side) of the movable lens, which is moved in the optical axis direction by the autofocus function, and is positioned to 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. Furthermore, the blade drive unit BD may be configured to move together with the movable lens. Alternatively, the blade drive unit BD may be mounted inside a lens drive device equipped with a periscope actuator and positioned to function as a variable aperture device.

[0012] Specifically, as shown in Figure 2, the blade drive device BD includes a cover member 1, a blade support member 2, a blade member 3, a leaf spring 4, a rotating member 5, a magnet 6, a magnet 7, a magnetic member 8, a support member 9, a first fixed member 10, a second fixed member 11, a coil 12, a substrate 13, and a sensor 14. The cover member 1, the blade support member 2, the magnetic member 8, the first fixed member 10, the second fixed member 11, the coil 12, the substrate 13, and the sensor 14 constitute the fixed-side member FB. The rotating member 5, magnet 6, and magnet 7 are configured to rotate around the rotation axis RX relative to the fixed-side member FB. In other words, the blade drive device BD is a so-called moving magnet type blade drive device.

[0013] The cover member 1 is a component that constitutes a part of the housing HS, and as shown in Figure 1, it is joined to the first fixing member 10 by adhesive or welding, and together with the first fixing member 10, constitutes the housing HS. In this embodiment, the cover member 1 is a component made of metal and is composed of a cylindrical outer peripheral portion 1A and an annular plate-shaped top plate portion 1B. A central opening 1K is formed in the top plate portion 1B. The cover member 1 may also be made of synthetic resin.

[0014] The blade support member 2 is a member that supports the blade member 3. In the illustrated example, the blade support member 2 is a substantially annular plate-shaped member made of a synthetic resin such as polyimide, and has six notches 2C, six through holes 2H, and a central opening 2K. The blade support member 2 may also be made of metal.

[0015] The blade member 3 is a component of the aperture. In this embodiment, the blade member 3 is a flat plate-shaped member made of a synthetic resin such as polyimide, and includes the first blade member 3A to the sixth blade member 3F, as shown in Figure 2. In the illustrated example, the first blade member 3A to the sixth blade member 3F have the same shape and size. The blade member 3 may also be made of metal. Figure 2 shows the state of the blade member 3 when the aperture opening AP is in its minimum open state.

[0016] The leaf spring 4 is a component of the drive mechanism DM and is formed from a metal plate such as a copper alloy. Specifically, the leaf spring 4 includes a first leaf spring 4A and a second leaf spring 4B. In the illustrated example, the leaf spring 4 has a fixed side portion 4F fixed to the second fixed member 11, a movable side portion 4M fixed to the rotating member 5, and an elastic arm portion 4G connecting the fixed side portion 4F and the movable side portion 4M. Specifically, the first leaf spring 4A has a first fixed side portion 4FA, a first movable side portion 4MA, and a first elastic arm portion 4GA, and the second leaf spring 4B has a second fixed side portion 4FB, a second movable side portion 4MB, and a second elastic arm portion 4GB.

[0017] The rotating member 5 is a member that is rotated by the drive mechanism DM, which is the opening and closing mechanism of the aperture, and is configured to rotate around the rotation axis RX shown in Figure 1. In this embodiment, as shown in Figure 2, the rotating member 5 is a member made of a synthetic resin such as a liquid crystal polymer, and includes a substantially cylindrical tubular portion 5N having a central opening 5K, and a flange portion 5T that protrudes radially outward from the tubular portion 5N along the X-axis direction. The flange portion 5T includes a first flange portion 5TA that protrudes in the direction of X1, and a second flange portion 5TB that protrudes in the direction of X2. The rotating member 5 may also be made of metal.

[0018] Magnet 6 is a component of the drive mechanism DM and is attached to the rotating member 5. In the illustrated example, magnet 6 is a quadrupole magnetized permanent magnet and includes a first magnet 6A and a second magnet 6B. Note that the first magnet 6A may be a combination of two bipole magnetized permanent magnets. The same applies to the second magnet 6B. In the illustrated example, for the sake of clarity, a cross pattern is applied to the north pole portion of magnet 6 and a dot pattern is applied to the south pole portion of magnet 6. The same applies to magnet 7.

[0019] Furthermore, in the illustrated example, the magnet 6 has a substantially rectangular parallelepiped shape, and is positioned so that the normal to its inner end face SF passes through the rotation axis RX. However, if the magnet 6 is composed of a combination of two bipolar magnetized permanent magnets, the magnet 6 may be positioned such that the line connecting the center points of each of the two permanent magnets to the rotation axis RX is perpendicular to the inner end faces SF of each of the two permanent magnets when viewed in a plan view (top view) along the rotation axis RX. In other words, the magnet 6 may be positioned so that the inner end faces SF of each of the two permanent magnets are inclined relative to each other. Also, the magnet 6 may be configured such that the inner end face SF and the outer end face are arc-shaped when viewed from above.

[0020] The magnet 7 is a component of the rotation position detection means for detecting the rotational position of the rotating member 5, and is attached to the rotating member 5. In the illustrated example, the magnet 7 is a bipolar magnetized permanent magnet and is arranged to cooperate with the sensor 14 attached to the substrate 13.

[0021] The magnetic member 8 is a component of a separation suppression means that prevents the rotating member 5 from separating from the first fixed member 10, and is attached to the fixed-side member FB. In the illustrated example, as shown in Figure 2, the magnetic member 8 is a substantially arc-shaped plate member and includes a first magnetic member 8A and a second magnetic member 8B. Specifically, the magnetic member 8 is attached to the first fixed member 10 at a position facing the magnet 6 along the direction of the rotation axis RX, such that the magnet 6 attached to the rotating member 5 is attracted to the magnetic member 8 by the magnetic force of the magnet 6.

[0022] The support member 9 is a member that supports the rotating member 5 so that it can rotate relative to the fixed member FB. In the illustrated example, the support member 9 is a non-magnetic ceramic ball (rolling element, sphere) and includes the first support member 9A to the fourth support member 9D. Specifically, the support member 9 is arranged to be sandwiched between the rotating member 5 and the first fixed member 10. The support member 9 may also be made of other materials such as a non-magnetic metal or synthetic resin.

[0023] The first fixing member 10 is a component that constitutes a part of the housing HS, and as shown in Figure 1, it is joined to the cover member 1 by adhesive or welding, and together with the cover member 1, constitutes the housing HS. In this embodiment, the first fixing member 10 is a component made of a synthetic resin such as polyimide, and is composed of an inner circumference portion 100, a cylindrical outer circumference portion 101, and an annular plate-shaped bottom plate portion 102. Specifically, the inner circumference portion 100 is composed of an inner wall portion 100W (first inner wall portion 100W1 and second inner wall portion 100W2) and a notch portion 100N (first notch portion 100N1 and second notch portion 100N2). The inner wall portion 100W (first inner wall portion 100W1 and second inner wall portion 100W2) is a part of the inner circumference portion 100 (a partially cylindrical portion), and the notch portion 100N (first notch portion 100N1 and second notch portion 100N2) is another part of the inner circumference portion 100 (a partially cylindrical space).

[0024] The second fixing member 11 is a component that constitutes a part of the fixing side member FB. In this embodiment, the second fixing member 11 is a component made of a synthetic resin such as polyimide. The coil 12 is attached to the second fixing member 11.

[0025] The coil 12 is a component of the drive mechanism DM and is attached to the second fixing member 11. Specifically, the coil 12 works in cooperation with the magnet 6 to constitute the drive mechanism DM.

[0026] Figure 3 is a perspective view of the second fixing member 11 and the coil 12. Specifically, the top of Figure 3 is a perspective view of the second fixing member 11, the middle of Figure 3 is a perspective view of the coil 12, and the bottom of Figure 3 is a perspective view of the second fixing member 11 to which the coil 12 is attached. The block arrow attached to the coil 12 indicates the direction of current flow.

[0027] The second fixing member 11 includes a cylindrical tubular portion 110, a protruding portion 111 projecting radially outward from the tubular portion 110 along the Y-axis direction, a holding portion 112 that holds (winds around) the end of the conductor (wire material) constituting the coil 12, and a flange portion 113 that projects radially outward from the tubular portion 110 along the X-axis direction. Specifically, the protruding portion 111 includes a first protruding portion 111A projecting in the Y1 direction and a second protruding portion 111B projecting in the Y2 direction. The holding portion 112 includes a first holding portion 112A that holds one end of the conductor constituting the coil 12 and a second holding portion 112B that holds the other end of the conductor constituting the coil 12. The flange portion 113 includes a first flange portion 113A projecting in the X1 direction and a second flange portion 113B projecting in the X2 direction.

[0028] The coil 12 includes a main body portion 121 around which a conductor is wound, an extension portion 122 extending between the main body portion 121 and the end of the conductor, and a connecting portion 123 connecting the two main body portions 121. The connecting portion 123 is also called a "crossover." Specifically, the main body portion 121 includes a first main body portion 121A attached to the first projection portion 111A, and a second main body portion 121B attached to the second projection portion 111B. The extension portion 122 includes a first extension portion 122A directly wound around the first holding portion 112A, and a second extension portion 122B directly wound around the second holding portion 112B. The main body portion 121 may be directly wound around the projection portion 111, or it may be wound elsewhere and then attached to the projection portion 111 in a wound state. Furthermore, the coil 12 may be a combination of multiple separate and independent coils. Furthermore, the first protrusion 111A and the second protrusion 111B may each be divided into multiple (two) parts by grooves (recesses), as shown in the upper diagram of Figure 7. This is to allow the end of the jig used when winding the main body 121 of the coil 12 around the protrusion 111 to abut against the inner bottom surface of the groove. In other words, this is to prevent the end of the jig from abutting the end of the protrusion 111 and causing an indentation on the end of the protrusion 111 (the outermost surface of the protrusion 111 on the radially outward side). To put it another way, if an indentation occurs on the end of the protrusion 111, there is a risk that the protrusion 111 may interfere with a component such as a magnet 6 that is facing the protrusion 111 with a small gap between them. In addition, the volume of the protrusion 111 can be reduced, and consequently, the occurrence of sink marks during molding can be suppressed and the dimensional accuracy of the protrusion 111 can be improved.

[0029] The substrate 13 is a component for supplying current to the coil 12. In the illustrated example, the substrate 13 is a flat, flexible wiring board. However, the substrate 13 may be a rigid board.

[0030] Sensor 14 is a component of a rotational position detection means that detects the rotational position of the rotating member 5. In the illustrated example, the rotational position detection means is composed of a combination of a magnet 7 and a sensor 14. Sensor 14 is a Hall sensor (Hall element) that converts the magnetic field generated by the magnet 7 into an electrical signal and outputs it, and is mounted on the substrate 13.

[0031] The drive mechanism DM is a mechanism for rotating the rotating member 5 around the rotation axis RX. In the illustrated example, the drive mechanism DM includes a magnet 6 and a coil 12. Furthermore, as shown in Figure 2, the drive mechanism DM includes a first drive mechanism DM1 and a second drive mechanism DM2, and is configured to rotate the rotating member 5 in the direction indicated by arrow AR1 to reduce the aperture AP of the diaphragm.

[0032] As shown in Figure 2, the blade support member 2, blade members 3, rotating member 5, and second fixing member 11 are assembled by engaging the engaging portion and engaged portion provided on each member. Specifically, the blade support member 2 has six circular through holes 2H and six notches 2C as engaged portions. Each of the six blade members 3 has a circular first through hole 3H1 and a substantially arc-shaped second through hole 3H2 as engaged portions. The rotating member 5 has six protrusions 5P that project upward from the upper surface of the cylindrical portion 5N as engaged portions. The second fixing member 11 also has six protrusions 11P that project upward from the upper surface of the cylindrical portion 110 as engaged portions. Note that the engaging portion (protrusion) and engaged portion (through hole or notch) in the illustrated example may be replaced with engaged portion (through hole or notch) and engaging portion (protrusion), respectively. Furthermore, the notch 2C may be a through hole, and the through hole 2H may be a notch.

[0033] More specifically, the protrusions 5P of the rotating member 5 are inserted through the first through-hole 3H1 of the blade member 3 and the notch 2C of the blade support member 2, as shown by the dashed line DL1 in Figure 2. The protrusions 5P are configured to be immobile relative to the first through-hole 3H1 within the first through-hole 3H1, and to be movable relative to the notch 2C within the notch 2C. The six protrusions 11P of the second fixing member 11 are inserted through the second through-hole 3H2 of the blade member 3 and the through-hole 2H of the blade support member 2, as shown by the dashed line DL2 in Figure 2. The protrusions 11P are configured to be substantially movable relative to the second through-hole 3H2 within the second through-hole 3H2, and to be substantially immobile relative to the through-hole 2H within the through-hole 2H.

[0034] Here, with reference to Figures 4 and 5, the positional relationships of the blade support member 2, blade member 3, rotating member 5, and second fixing member 11 will be described in detail. Figure 4 is a bottom view of the blade support member 2 and blade member 3. In Figure 4, for clarity, the six protrusions 5P of the rotating member 5 are shown with dotted lines, and the six protrusions 11P of the second fixing member 11 are shown with dashed lines. Specifically, the upper left and lower left views of Figure 4 are bottom views of the blade support member 2 without the blade member 3 attached, and the upper right and lower right views of Figure 4 are bottom views of the blade support member 2 with the blade member 3 attached. The upper left view corresponds to the upper right view, and the lower left view corresponds to the lower right view. The upper left and upper right views show the aperture AP in its maximum open state, and the lower left and lower right views show the aperture AP in its minimum open state. Figure 5 is a top view of the blade member 3 and rotating member 5. Specifically, the top view of Figure 5 is a top view of the rotating member 5 without the blade member 3 attached, while the center and bottom views of Figure 5 are top views of the rotating member 5 with the blade member 3 attached. In the center and bottom views of Figure 5, for clarity, the six protrusions 11P of the second fixing member 11 are shown with dashed lines. The top and center views of Figure 5 show the aperture AP in its maximum open state and correspond to the upper left and upper right views of Figure 4. The bottom view of Figure 5 shows the aperture AP in its minimum open state and corresponds to the lower left and lower right views of Figure 4.

[0035] More specifically, as shown in the lower right of Figure 4, when the rotating member 5 rotates by an angle θ1 counterclockwise with respect to the rotation axis RX in a bottom view from the state shown in the upper right of Figure 4, the protrusion 5P moves, causing the blade member 3 to oscillate. Specifically, the protrusion 5P of the rotating member 5 corresponding to the first blade member 3A moves diagonally upward and to the left in the figure within the notch 2C of the blade support member 2, and the protrusion 11P of the second fixing member 11 corresponding to the first blade member 3A moves relatively within the second through hole 3H2 of the first blade member 3A. Therefore, the first blade member 3A oscillates around the corresponding protrusion 5P in the direction indicated by the arrow AR2 in the upper right of Figure 4. The same applies to the second blade members 3B to the sixth blade members 3F.

[0036] In other words, as shown in the lower part of Figure 5, when the rotating member 5 rotates clockwise around the rotation axis RX in a plan view by an angle θ1 from the state shown in the center of Figure 5, the protrusion 5P moves, causing the blade member 3 to oscillate. Specifically, the protrusion 5P of the rotating member 5 corresponding to the first blade member 3A moves diagonally downward to the left in the first through hole 3H1 of the first blade member 3A, and the protrusion 11P of the second fixed member 11 corresponding to the first blade member 3A moves relatively within the second through hole 3H2 of the first blade member 3A. As a result, the first blade member 3A oscillates around the corresponding protrusion 5P in the direction indicated by arrow AR3 in the center of Figure 5. The same applies to the second blade members 3B to the sixth blade members 3F. As a result, the aperture AP of the diaphragm becomes smaller until it reaches its minimum open state.

[0037] Next, with reference to Figure 6, the positional relationship between the rotating member 5, the first fixed member 10, and the second fixed member 11 will be explained. Figure 6 shows the state in which the rotating member 5, the first fixed member 10, and the second fixed member 11 are assembled. Specifically, the left side of Figure 6 is a top view of the rotating member 5, the first fixed member 10, and the second fixed member 11, and the center side of Figure 6 is a bottom view of the rotating member 5, the first fixed member 10, and the second fixed member 11. The right side of Figure 6 is a cross-sectional view of the rotating member 5, the first fixed member 10, and the second fixed member 11. More specifically, the right side of Figure 6 is a view of the cross-section of the rotating member 5, the first fixed member 10, and the second fixed member 11 as seen from the Y2 side in a virtual plane parallel to the XZ plane containing the cutting line CL1 in the left and center sides of Figure 6. In Figure 6, for clarity, the first fixing member 10 is marked with a coarse dot pattern, the rotating member 5 with a fine dot pattern, and the second fixing member 11 with an even finer dot pattern. Also, the left side of Figure 6 shows a leaf spring 4.

[0038] As shown in Figure 6, the first fixing member 10 is positioned radially outward of the second fixing member 11 so as to surround the second fixing member 11. Specifically, as shown in the center view of Figure 6, the second fixing member 11 is fixed to the first fixing member 10 by fitting a flange portion 113, which protrudes radially outward along the X-axis from the cylindrical portion 110, into a recess 10R of the first fixing member 10. More specifically, the flange portion 113 includes a first flange portion 113A protruding in the direction of X1 and a second flange portion 113B protruding in the direction of X2, and the recess 10R includes a first recess 10RA that receives the first flange portion 113A and a second recess 10RB that receives the second flange portion 113B.

[0039] Furthermore, as shown in the right-hand diagram of Figure 6, the rotating member 5 is positioned such that the cylindrical portion 5N surrounds the inner wall portion 100W of the first fixing member 10 and the second fixing member 11, and the flange portion 5T is located on the Z1 side of the bottom plate portion 102 of the first fixing member 10.

[0040] Furthermore, as shown in the left diagram of Figure 6, the leaf spring 4 is positioned such that a protrusion 5Q provided on the upper surface of the flange portion 5T is inserted through a through hole formed in the movable portion 4M. Also, as shown in the left diagram of Figure 6, the leaf spring 4 is positioned such that a protrusion 10Q provided on the upper surface of the outer circumference 101 of the first fixing member 10 is inserted through a through hole formed in the fixed portion 4F.

[0041] Next, the manufacturing method (assembly method) of the blade drive device BD will be described with reference to Figures 7 to 11. Specifically, Figure 7 is a downward perspective view of the second fixing member 11 to which the coil 12 is attached, Figure 8 is a downward perspective view of the first fixing member 10 to which the second fixing member 11 and the substrate 13 are attached, and Figure 9 is a downward perspective view of the rotating member 5 to which the magnets 6 and 7 are attached. Furthermore, Figure 10 is an upward perspective view of the first fixing member 10 to which the rotating member 5, magnetic member 8, and support member 9 are attached, and Figure 11 is an upward perspective view of the first fixing member 10 and the second fixing member 11 to which the cover member 1, blade support member 2, and blade member 3 are attached.

[0042] Specifically, as shown in FIG. 7, the coil 12 is attached to the second fixing member 11 before the second fixing member 11 is attached to the first fixing member 10. In the example shown in the lower diagram of FIG. 7, first, the first extending portion 122A is wound around the first holding portion 112A, then the first main body portion 121A is wound around the first protruding portion 111A, then the second main body portion 121B is wound around the second protruding portion 111B, and finally, the second extending portion 122B is wound around the second holding portion 112B.

[0043] In addition, the holding portion 112 is provided with an inclined portion SL for avoiding the connection portion CN extending between the main body portion 121 of the extending portion 122 and the holding portion 112 from bending at a substantially right angle or an acute angle. Specifically, as shown in the upper diagram of FIG. 3, the first holding portion 112A is provided with a first inclined portion SLA for avoiding the connection portion CN of the first extending portion 122A from bending at a substantially right angle or an acute angle. Also, as shown in the upper diagram of FIG. 7, the second holding portion 112B is provided with a second inclined portion SLB for avoiding the connection portion CN of the second extending portion 122B from bending at a substantially right angle or an acute angle. This inclined portion SL has the effect of suppressing damage to the conducting wire constituting the coil 12 when the coil 12 is wound around the second fixing member 11.

[0044] Thereafter, the second fixing member 11 is attached to the first fixing member 10 as shown in the central diagram of FIG. 8. Specifically, the second fixing member 11 to which the coil 12 is attached is fitted radially inward of the inner peripheral portion 100 of the first fixing member 10 from the Z2 side (lower side) of the first fixing member 10 and fixed to the first fixing member 10 with an adhesive. In the example shown in the central diagram of FIG. 8, the first flange portion 113A (see FIG. 7) of the second fixing member 11 is fitted into the first recess 10RA of the first fixing member 10, and the second flange portion 113B (see FIG. 7) of the second fixing member 11 is fitted into the second recess 10RB of the first fixing member 10. Also, the first main body portion 121A of the coil 12 is arranged to correspond to the first notch portion 100N1 of the first fixing member 10, and the second main body portion 121B of the coil 12 is arranged to correspond to the second notch portion 100N2 of the first fixing member 10.

[0045] Subsequently, the substrate 13 on which the sensor 14 is mounted is attached to the second fixing member 11, as shown in the lower diagram of Figure 8. The second fixing member 11 may be attached to the first fixing member 10 after the substrate 13 has been attached. Specifically, the substrate 13 is attached to the second fixing member 11 such that the sensor 14 mounted on the Z1 side (upper side) of the substrate 13 is positioned inside the substantially rectangular through hole 10H provided in the first fixing member 10. The substrate 13 also includes two through holes 13H through which two protrusions 10T provided on the lower surface of the first fixing member 10 are inserted, and two notches 13C through which two retaining parts 112 provided on the lower surface of the second fixing member 11 are inserted. Then, as shown in the lower diagram of Figure 8, the substrate 13 is attached to the first fixing member 10 and the second fixing member 11 such that two protrusions 10T are inserted through two through holes 13H and two holding portions 112 are inserted through two notches 13C. At this stage, the extended portion 122 of the coil 12 wound around the holding portion 112 is joined to a conductive pattern (not shown) formed on the lower surface of the substrate 13 via solder SD.

[0046] Furthermore, magnets 6 and 7 are attached to the rotating member 5 as shown in Figure 9. Specifically, magnet 6 is fitted into a large recess 5R provided in the cylindrical portion 5N of the rotating member 5 and fixed with adhesive. Magnet 7 is fitted into a small recess 5U provided in the cylindrical portion 5N of the rotating member 5 and fixed with adhesive. In the illustrated example, the first magnet 6A is fitted into the large recess 5R (first large recess 5RA) so that the Z2 side (lower side) and the Y2 side (inner, right side) are exposed, and the second magnet 6B is fitted into the large recess 5R (second large recess 5RB) so that the Z2 side (lower side) and the Y1 side (inner, left side) are exposed. Magnet 7 is fitted into the small recess 5U so that the Z2 side (lower side) is exposed.

[0047] After that, as shown in the upper diagram of FIG. 10, the first fixing member 10, the second fixing member 11 to which the coil 12 is attached, and the substrate 13 on which the sensor 14 is mounted are combined to form the first assembly AS1. After that, the magnetic member 8 is fitted into the arc-shaped recess 10U formed in the bottom plate portion 102 of the first fixing member 10. Specifically, as shown in the central diagram of FIG. 10, the first magnetic member 8A is fitted into the first arc-shaped recess 10UA and fixed with an adhesive, and the second magnetic member 8B is fitted into the second arc-shaped recess 10UB and fixed with an adhesive. Further, as shown in the central diagram of FIG. 10, the support member 9 is arranged to be rollable in the arc-shaped groove 10G formed in the bottom plate portion 102 of the first fixing member 10. Specifically, the first support member 9A is arranged in the first arc-shaped groove 1bGa, the second support member 9B is arranged in the second arc-shaped groove 1bGb, the third support member 9C is arranged in the third arc-shaped groove 1bGc, and the fourth support member 9D is arranged in the fourth arc-shaped groove 1bGd. Note that the magnetic member 8 may be attached to the first fixing member 10 before the first fixing member 10 is combined with other members.

[0048] After that, the rotating member 5 (see the lower diagram of FIG. 9) to which the magnets 6 and 7 are attached is combined with the first assembly AS1 as shown in the lower diagram of FIG. 10 to form the second assembly AS2.

[0049] After that, as shown in the upper diagram of FIG. 11, the blade member 3 is attached to the second assembly AS2, as shown in the central diagram of FIG. 11, the blade support member 2 is attached, and further, as shown in the lower diagram of FIG. 11, the cover member 1 is attached.

[0050] Next, referring to FIGS. 12 to 14, the positional relationship among the leaf spring 4, the rotating member 5, the magnets 6 and 7, the magnetic member 8, the support member 9, the first fixing member 10, the second fixing member 11, the coil 12, and the sensor 14 when the rotating member 5 rotates will be described.

[0051] Figure 12 is a bottom view of the leaf spring 4, rotating member 5, magnet 6, magnet 7, and magnetic member 8. Specifically, the top view of Figure 12 shows the state of the leaf spring 4, rotating member 5, magnet 6, magnet 7, magnetic member 8, and support member 9 in the blade drive device BD when no current is flowing through the coil 12, that is, when the aperture opening AP is in its maximum open state as shown in the top view of Figure 1. The middle view of Figure 12 shows the state of the leaf spring 4, rotating member 5, magnet 6, magnet 7, magnetic member 8, and support member 9 in the blade drive device BD when the aperture opening AP is in an intermediate open state as shown in the middle view of Figure 1. The bottom view of Figure 12 shows the state of the leaf spring 4, rotating member 5, magnet 6, magnet 7, magnetic member 8, and support member 9 in the blade drive device BD when the aperture opening AP is in its minimum open state as shown in the bottom view of Figure 1. Note that in Figure 12, a dot pattern is added to the rotating member 5 for clarity.

[0052] Figure 13 is a top view of the leaf spring 4, magnet 6, magnet 7, magnetic member 8, support member 9, first fixing member 10, second fixing member 11, coil 12, and sensor 14. Specifically, the top view of Figure 13 shows the state of the leaf spring 4, magnet 6, magnet 7, magnetic member 8, support member 9, first fixing member 10, second fixing member 11, coil 12, and sensor 14 in the blade drive device BD when no current is flowing through the coil 12, that is, when the aperture opening AP is in the fully open state as shown in the top view of Figure 1. Also, the center view of Figure 13 shows the state of the leaf spring 4, magnet 6, magnet 7, magnetic member 8, support member 9, first fixing member 10, second fixing member 11, coil 12, and sensor 14 in the blade drive device BD when the aperture opening AP is in the intermediate open state as shown in the center view of Figure 1. Furthermore, the lower diagram of Figure 13 shows the state of the leaf spring 4, magnet 6, magnet 7, magnetic member 8, support member 9, first fixing member 10, second fixing member 11, coil 12, and sensor 14 in the blade drive device BD when the aperture AP is in its minimum open state, as shown in the lower diagram of Figure 1. Note that in Figure 13, a dot pattern is added to the first fixing member 10 for clarity.

[0053] Figure 14 is a cross-sectional view of the blade drive unit BD. Specifically, Figure 14 is a view of the cross-section of the blade drive unit BD as seen in the direction indicated by the dashed arrow, in a virtual plane parallel to the rotation axis RX that includes the cutting line CL2 in Figures 12 and 13, respectively. In Figure 14, for clarity, the first fixed member 10 is marked with a coarse dot pattern, the rotating member 5 is marked with a fine dot pattern, and the second fixed member 11 is marked with an even finer dot pattern.

[0054] In the illustrated example, when no current flows through the coil 12, that is, when the aperture AP is in its minimum open state, the rotating member 5 is in the initial state shown in the upper part of Figure 12, and the inner end face SF of the magnet 6 is positioned to be inclined with respect to the coil axis 12X. Specifically, the first inner end face SFA of the first magnet 6A is inclined with respect to the first coil axis 12AX, and the second inner end face SFB of the second magnet 6B is inclined with respect to the second coil axis 12BX. More precisely, the magnets 6 are positioned such that the front portion (X1 side portion) of the first magnet 6A is closer to the first main body 121A than the rear portion (X2 side portion) of the first magnet 6A, and the front portion of the second magnet 6B is further from the second main body 121B than the rear portion of the second magnet 6B.

[0055] When current flows through coil 12, the rotating member 5 rotates in the direction indicated by arrow AR4 in the center view of Figure 12. The same applies to magnets 6 and 7 attached to the rotating member 5.

[0056] The leaf spring 4 stretches as the rotating member 5 rotates. In the illustrated example, as shown in Figure 13, the second leaf spring 4B is configured such that the distance DS between the second fixed portion 4FB and the second movable portion 4MB increases as the rotating member 5 rotates around the rotation axis RX, and the restoring force by the second leaf spring 4B also increases. The same applies to the first leaf spring 4A. Specifically, the distance DS is value DS1 when the aperture AP is in its minimum open state (see the upper diagram in Figure 13), value DS2 when the aperture AP is in an intermediate open state (> value DS1) (see the middle diagram in Figure 13), and value DS3 when the aperture AP is in its maximum open state (> value DS2) (see the lower diagram in Figure 13).

[0057] Then, when the current flowing through the coil 12 increases to a predetermined level, as shown in the center diagram of Figure 12, the rotating member 5 rotates by an angle θ2 from its initial state, and the inner end face SF of the magnet 6 becomes perpendicular to the coil axis 12X. Furthermore, when the current flowing through the coil 12 increases even more, as shown in the lower diagram of Figure 12, the rotating member 5 rotates by an angle θ3 from its initial state, and the inner end face SF of the magnet 6 tilts to the opposite side with respect to the coil axis 12X. Specifically, the inner end face SF of the magnet 6 tilts such that the front part of the first magnet 6A is further from the first main body 121A than the rear part of the first magnet 6A, and the front part of the second magnet 6B is closer to the second main body 121B than the rear part of the second magnet 6B.

[0058] In the illustrated example, as shown in Figure 12, the magnetic member 8 is positioned such that the overlapping area of ​​the magnet 6 and the magnetic member 8 in a plan view along the rotation axis RX is the same size, regardless of the rotation angle of the rotating member 5. In Figures 12 and 13, a cross pattern is added to the overlapping area of ​​the magnet 6 and the magnetic member 8 for clarity. This configuration has the effect that the force exerted by the separation suppression means (the magnetic attractive force acting between the magnet 6 and the magnetic member 8) does not change regardless of the rotation angle of the rotating member 5. However, the magnetic member 8 may also be positioned such that the overlapping area of ​​the magnet 6 and the magnetic member 8 in a plan view along the rotation axis RX changes according to the rotation angle of the rotating member 5.

[0059] The support member 9 is positioned between the arc-shaped groove 5G (see upper diagram in Figure 12) formed on the lower surface of the cylindrical portion 5N of the rotating member 5 and the arc-shaped groove 10G (see upper diagram in Figure 13) formed on the upper surface of the bottom plate portion 102 of the first fixing member 10. Specifically, the first support member 9A is held between the first arc-shaped groove 5GA and the first arc-shaped groove 10GA, the second support member 9B is held between the second arc-shaped groove 5GB and the second arc-shaped groove 10GB, the third support member 9C is held between the third arc-shaped groove 5GC and the third arc-shaped groove 10GC, and the fourth support member 9D is held between the fourth arc-shaped groove 5GD and the fourth arc-shaped groove 10GD.

[0060] More specifically, as shown in Figure 14, the first support member 9A contacts the bottom surface of the first arc-shaped groove 10GA at the first contact point CP1, the outer circumferential surface of the first inner wall 100W1 at the second contact point CP2, and the bottom surface (top surface) of the first arc-shaped groove 5GA at the third contact point CP3. In other words, the first support member 9A is positioned to contact other members at two points (first contact point CP1 and third contact point CP3) in the direction along the rotation axis RX (X-axis direction), and to contact other members at one point (second contact point CP2) in the radial direction perpendicular to the rotation axis RX. Furthermore, when the rotating member 5 moves in the Y1 direction in a plane perpendicular to the rotation axis RX (XY plane), the first support member 9A is positioned to contact the wall surface of the first arc-shaped groove 5GA at the fourth contact point CP4. In other words, the first support member 9A is positioned to contact another member at a different point (fourth contact point CP4) in the radial direction perpendicular to the rotation axis RX. Similarly, the third support member 9C contacts the bottom surface of the third arc-shaped groove 10GC at the first contact point CP1, the outer circumferential surface of the second inner wall 100W2 at the second contact point CP2, and the bottom surface (ceiling surface) of the third arc-shaped groove 5GC at the third contact point CP3. Furthermore, the third support member 9C is positioned so that when the rotating member 5 moves in the Y2 direction in a plane perpendicular to the rotation axis RX (XY plane), it contacts the wall surface of the third arc-shaped groove 5GC at the fourth contact point CP4. The same applies to the second support member 9B and the fourth support member 9D.

[0061] This arrangement has the effect of allowing the support member 9 to stably rotate the rotating member 5 relative to the first fixing member 10 and the second fixing member 11.

[0062] As described above, the blade drive device BD according to the embodiment of the present disclosure, as shown in Figure 2, includes a fixed-side member FB, a rotating member 5 rotatable relative to the fixed-side member FB, a drive mechanism DM for rotating the rotating member 5, and a plurality of blade members 3 that rotate in conjunction with the rotation of the rotating member 5. The drive mechanism DM includes a coil 12 provided on the fixed-side member FB and a magnet 6 provided on the rotating member 5 and positioned opposite the coil 12. The coil 12 is positioned closer to the center of rotation (rotation axis RX) than the magnet 6. In the illustrated example, the magnet 6 and the coil 12 are positioned opposite each other in the radial direction (direction perpendicular to the rotation axis RX), but they may be positioned opposite each other in a direction extending diagonally with respect to the rotation axis RX.

[0063] This configuration has the effect of preventing the size of the coil 12, which constitutes the drive mechanism DM of the blade drive unit BD, from becoming too large. This is because this configuration prevents the length of the wires constituting the coil 12 from becoming too long compared to the case where the coil 12 is located further from the center of rotation (rotation axis RX) than the magnet 6. Therefore, this configuration has the effect of preventing the conductive resistance of the wires constituting the coil 12 from becoming too large.

[0064] Furthermore, the fixed-side member FB (second fixed member 11) may have a protruding portion 111 that extends radially outward, and a coil 12 may be provided on the outer circumference of the protruding portion 111. That is, the coil 12 may have a coil shaft 12X that extends radially.

[0065] This configuration has the effect of improving the positioning accuracy of the coil 12 compared to a configuration in which the protruding portion 111 does not exist (for example, a configuration in which the fixed-side member FB has a flat surface to which the coil 12 is attached).

[0066] Furthermore, as shown in Figure 3, the coil 12 may have a main body portion 121 in which a conductor is wound around the outer circumference of the protruding portion 111. The fixed-side member FB (second fixed member 11) may have a support surface 110S facing the main body portion 121. The main body portion 121 may also be wound directly around the protruding portion 111. In the example shown in Figure 3, the second fixed member 11 includes a flat first support surface 110SA facing the first main body portion 121A and a flat second support surface 110SB facing the second main body portion 121B.

[0067] This configuration has the effect of improving the positioning accuracy of the coil 12 relative to the magnet 6.

[0068] Furthermore, as shown in Figure 3, the coil 12 may have a main body portion 121 with a wire wound around the outer circumference of the protruding portion 111, and an extended portion 122 extending from the main body portion 121. The fixed-side member FB (second fixed member 11) may have a holding portion 112 that holds a part of the extended portion 122. The holding portion 112 may be located further away from the blade member 3 than the main body portion 121 (a position lower than the main body portion 121) in the direction along the rotation axis RX of the rotating member 5 (Z-axis direction). In other words, the main body portion 121 may be arranged to be located between the blade member 3 and the holding portion 112 in the direction along the rotation axis RX (Z-axis direction).

[0069] Unlike the case where the blade member 3 and the holding part 112 are arranged on the same side when viewed from the main body 121, this configuration has the effect of avoiding interference between the blade member 3 and the holding part 112. Therefore, this configuration increases the degree of freedom in the arrangement of the holding part 112, allowing the conductors (wires) that make up the coil 12 to be routed without being obstructed by the blade member 3, and consequently, enabling current to flow through the coil 12 reliably and easily.

[0070] Furthermore, as shown in Figure 2, the blade drive device BD may have a substrate 13 to which one end of the extended portion 122 held by the holding portion 112 is electrically connected. In the illustrated example, one end of the extended portion 122 and the substrate 13 are electrically connected via solder SD, as shown in the lower part of Figure 8. The substrate 13 may also be arranged without being curved. That is, the extended portion 122 and the substrate 13 may be arranged to be connected at a position further away from the blade member 3 than the main body portion 121 (a position lower than the main body portion 121) in the direction along the rotation axis RX of the rotating member 5.

[0071] Unlike the case where the blade member 3 and the substrate 13 are arranged on the same side when viewed from the main body 121, this configuration has the effect of avoiding interference between the blade member 3 and the substrate 13. Therefore, this configuration has the effect of easily realizing an electrical connection between the extended portion 122 wrapped around the holding portion 112 and the conductor pattern formed on the substrate 13. Furthermore, this configuration allows for miniaturization of the substrate 13 compared to the configuration in which the substrate is arranged on the outer circumference of the fixed side member FB, and consequently, miniaturization of the blade drive device BD.

[0072] Furthermore, the fixed-side member FB may have a first fixed member 10 and a second fixed member 11 positioned radially inward from the first fixed member 10, as shown in Figure 2. The coil 12 may be attached to the second fixed member 11. That is, the protrusion 111 may be provided on the second fixed member 11.

[0073] This configuration has the effect of allowing the coil 12 to be wound around the protruding portion 111 of the second fixing member 11, and then the second fixing member 11 with the coil 12 wound around it to be assembled to the first fixing member 10. Therefore, this configuration has the effect of making it easier to position the coil 12 inside the magnet 6 in the radial direction.

[0074] Furthermore, the first fixing member 10 may have an inner circumference 100, as shown in Figure 2. The rotating member 5 may be positioned radially outward from the inner circumference 100. The inner circumference 100 may have an inner wall 100W and a notch 100N. The coil 12 may be provided at a position corresponding to the notch 100N. That is, the protruding portion 111 may be provided at a position corresponding to the notch 100N. In the example shown in Figure 2, the inner wall 100W includes a first inner wall 100W1 positioned on the X1 side of the rotating shaft RX and a second inner wall 100W2 positioned on the X2 side of the rotating shaft RX. The notch 100N includes a first notch 100N1 positioned on the Y1 side of the rotating shaft RX and a second notch 100N2 positioned on the Y2 side of the rotating shaft RX. Furthermore, the protrusion 111 includes a first protrusion 111A provided at a position corresponding to the first notch 100N1 and a second protrusion 111B provided at a position corresponding to the second notch 100N2. In the illustrated example, the cylindrical portion 110 of the second fixing member 11 and the inner circumference 100 of the first fixing member 10 are configured not to overlap in the radial direction, but they may be configured to partially overlap. That is, a part of the cylindrical portion 110 of the second fixing member 11 may be positioned radially outward from the inner wall portion 100W of the first fixing member 10.

[0075] This configuration allows the rotation of the rotating member 5 to be guided by the inner wall portion 100W, thus providing the effect of stabilizing the rotation of the rotating member 5. Furthermore, by positioning the protrusion 111 in a location where the inner wall portion 100W does not exist, this configuration allows the coil 12 wound around the protrusion 111 to be positioned further from the rotation axis RX than the inner circumferential surface of the inner wall portion 100W. Therefore, this configuration allows the distance between the coil 12 and the magnet 6 to be reduced, and consequently, the driving force of the drive mechanism DM to be increased.

[0076] Furthermore, multiple coils 12 and magnets 6 may be provided. In this case, the main body portion 121 of each of the multiple coils 12 may be connected by a connecting portion 123, as shown in Figure 3. That is, multiple coils 12 may be integrated into a single coil 12. And, as shown in Figure 3, a single coil 12 may include multiple (two) main body portions 121 and be composed of a single continuous conductor.

[0077] This configuration has the effect of increasing the driving force of the drive mechanism DM compared to the case where the drive mechanism DM is composed of one main body 121 and one magnet 6. In addition, the configuration in which multiple coils 12 are integrated into one coil 12 has the effect of reducing the number of connection points on the substrate 13 compared to when multiple coils 12 exist separately and independently, thereby improving the ease of assembly of the blade drive device BD.

[0078] Furthermore, a magnetic member 8 may be provided on the fixed-side member FB. The magnetic member 8 may be positioned to face the magnet 6 in the direction of the rotation axis RX of the rotating member 5.

[0079] This configuration has the effect of preventing the rotating member 5 from separating from the stationary member FB due to the magnetic force acting between the magnet 6 and the magnetic member 8. Furthermore, this configuration has the effect of stabilizing the rotation of the rotating member 5.

[0080] Furthermore, the blade drive device BD may have a leaf spring 4. One end of the leaf spring 4 may be fixed to the stationary member FB, and the other end of the leaf spring 4 may be fixed to the rotating member 5. In this case, the leaf spring 4 may be arranged to extend in accordance with the rotation of the rotating member 5 by the drive mechanism DM, as shown in Figure 13.

[0081] This configuration has the effect of allowing the rotating member 5 to return to its initial position when no current is flowing through the coil 12, thanks to the restoring force of the leaf spring 4.

[0082] Furthermore, the rotating member 5 may be rotatably supported by a support member 9 provided on the fixed-side member FB.

[0083] This configuration has the effect of further stabilizing the rotation of the rotating member 5 around the rotation axis RX.

[0084] Furthermore, the manufacturing method of the blade drive device BD according to the embodiment of this disclosure includes the steps of preparing a first fixing member 10 and a second fixing member 11 that constitute the fixed-side member FB as shown in Figure 2; attaching a coil 12 to the second fixing member 11 as shown in the lower part of Figure 7; combining the second fixing member 11 with the coil 12 attached to the first fixing member 10 as shown in the center part of Figure 8; and combining the rotating member 5 with the first fixing member 10 (fixed-side member FB) with the second fixing member 11 attached, as shown in the lower part of Figure 10.

[0085] This manufacturing method has the effect of making it easier to attach (wind) the coil 12 to the fixing side member FB (second fixing member 11) compared to a configuration in which the first fixing member 10 and the second fixing member 11 are not separated.

[0086] Preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described above. Various modifications and substitutions can be applied to the embodiments described above without departing from the scope of the present invention. Furthermore, each of the features described with reference to the embodiments described above may be combined as appropriate, as long as they do not conflict technically.

[0087] For example, in the embodiment described above, the blade member 3 is composed of six blade members (first blade member 3A to sixth blade member 3F) having the same shape and size, but it may also be composed of two to five or seven or more blade members having the same shape and size, or it may be composed of two or more blade members having different shapes.

[0088] Furthermore, in the above-described embodiment, the protrusion 5P provided on the rotating member 5 is inserted through the circular first through-hole 3H1 provided on the blade member 3, and the protrusion 11P provided on the second fixing member 11 is inserted through the substantially arc-shaped second through-hole 3H2 provided on the blade member 3. However, the blade drive device BD may be configured such that the protrusion provided on the rotating member 5 is inserted through the substantially arc-shaped second through-hole provided on the blade member 3, and the protrusion provided on the second fixing member 11 is inserted through the circular first through-hole provided on the blade member 3.

[0089] This application claims priority based on Japanese Patent Application No. 2025-006924, filed on 17 January 2025, and the entire contents of that Japanese Patent Application are incorporated herein by reference.

[0090]

Claims

1. A blade drive device comprising: a fixed side member; a rotating member rotatable relative to the fixed side member; a drive mechanism for rotating the rotating member; and a plurality of blade members that rotate in conjunction with the rotation of the rotating member, wherein the drive mechanism includes a coil provided on the fixed side member and a magnet provided on the rotating member and arranged opposite to the coil, and the coil is provided at a position closer to the center of rotation than the magnet.

2. The blade drive device according to claim 1, wherein the fixed side member has a projection that protrudes radially outward, and the coil is provided on the outer circumference of the projection.

3. The blade drive device according to claim 2, wherein the coil has a main body portion around which a conductor is wound on the outer circumference of the protruding portion, the fixed side member has a support surface facing the main body portion, and the main body portion is wound directly around the protruding portion.

4. The blade drive device according to claim 2, wherein the coil has a main body portion around which a conductor is wound on the outer circumference of the protruding portion, and an extended portion extending from the main body portion, the fixed side member has a holding portion that holds a part of the extended portion, and the holding portion is provided at a position further away from the blade member than the main body portion in a direction along the rotation axis of the rotating member.

5. The blade drive device according to claim 4, wherein one end of the extended portion held by the holding portion has a substrate to which it is electrically connected.

6. The vane drive device according to any one of claims 1 to 5, wherein the fixed side member comprises a first fixed member and a second fixed member disposed radially inward from the first fixed member, and the coil is attached to the second fixed member.

7. The vane drive device according to claim 6, wherein the first fixing member has an inner circumference, the rotating member is arranged radially outward from the inner circumference, the inner circumference has an inner wall and a notch, and the coil is provided at a position corresponding to the notch.

8. The blade drive device according to claim 6, wherein a plurality of coils and magnets are provided, and the plurality of coils are composed of a single continuous wire.

9. The vane drive device according to claim 6, wherein the fixed side member is provided with a magnetic member, and the magnetic member is arranged to face the magnet in the direction of the rotation axis of the rotating member.

10. The blade drive device according to claim 6, comprising a leaf spring, one end of the leaf spring being fixed to the fixed side member, and the other end of the leaf spring being fixed to the rotating member.

11. The blade drive device according to claim 6, wherein the rotating member is rotatably supported by a support member provided on the fixed side member.

12. A blade drive device comprising a fixed side member, a rotating member rotatable relative to the fixed side member, a drive mechanism for rotating the rotating member, and a plurality of blade members that rotate in conjunction with the rotation of the rotating member, wherein the drive mechanism includes a coil provided on the fixed side member and a magnet provided on the rotating member and arranged opposite to the coil, and the coil is provided closer to the center of rotation than the magnet, a method for manufacturing a blade drive device, comprising the steps of: preparing a first fixed member and a second fixed member constituting the fixed side member; attaching the coil to the second fixed member; combining the second fixed member with the coil attached and the first fixed member; and combining the rotating member with the fixed side member formed by combining the second fixed member and the first fixed member.

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