Blade driving device

Abstract

Downsizing of the blade driving device is also required.SOLUTION: The blade drive device includes a base having an opening, a first blade rotatably attached to the base, a second blade rotatably attached to the base, an actuator attached to the base, and a drive arm attached to a drive shaft of the actuator. The drive arm includes an arm plate extending radially from the drive shaft. The drive arm includes a first pin protruding from one surface of the arm plate and inserted into the guide hole of the first blade. The driving arm may include a second pin protruding from the other surface of the arm plate and inserted into the guide hole of the second blade.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a blade drive device. [Background technology]

[0002] The imaging device has a blade drive device that functions as a shutter or an aperture, and the blade drive device has two motors that drive the shutter blades (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-17777 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, imaging devices equipped with blade drive devices have been made smaller, and there is a demand for the blade drive devices to also be made smaller. [Means for solving the problem]

[0005] According to the present disclosure, a blade driving device includes a base with an opening, a first blade rotatably attached to the base, and a second blade rotatably attached to the base. The blade driving device includes an actuator attached to the base and a drive arm attached to a drive shaft of the actuator. The drive arm includes an arm plate extending radially from the drive shaft. The drive arm includes a first pin protruding from one side of the arm plate and inserted into a guide hole of the first blade. The drive arm includes a second pin protruding from the other side of the arm plate and inserted into a guide hole of the second blade. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to achieve miniaturization of the blade drive device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing an imaging device including a blade driving device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing the blade driving device. [Figure 3] FIG. 3 is an exploded perspective view showing the structure of the blade driving device. [Figure 4] FIG. 4 is an exploded perspective view showing the structure of a drive unit provided in the blade drive device. [Figure 5] FIG. 5 is a perspective view showing a rotor magnet and a drive arm incorporated into the drive unit. [Figure 6A] FIG. 6A is a diagram showing a rotor magnet and its vicinity. [Figure 6B] FIG. 6B is a diagram showing the rotor magnet and its vicinity. [Figure 7A] FIG. 7A shows the drive unit with the partition plate removed. [Figure 7B] FIG. 7B shows the drive unit with the partition plate removed. [Figure 8A] FIG. 8A shows the blade drive unit with the blade cover and partition plate removed. [Figure 8B] FIG. 8B shows the blade drive unit with the blade cover and partition plate removed. [Figure 9] FIG. 9 is a cross-sectional view showing the blade driving device along line IX-IX in FIG. 8A. [Figure 10] FIG. 10 is a simplified diagram showing a variation of the blade attached to the drive arm. [Figure 11] FIG. 11 is a simplified diagram showing a variation of the blade attached to the drive arm. [Figure 12]FIG. 12 is a perspective view showing a modified drive arm. [Figure 13] FIG. 13 is a plan view showing a modified drive arm. [Figure 14] FIG. 14 is a plan view showing a modified drive arm. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, identical or substantially identical configurations and elements will be designated by the same reference numerals and repeated description will be omitted.

[0009] <Imaging device> FIG. 1 is a perspective view showing an imaging device 11 including a blade drive device 10 according to an embodiment of the present disclosure. The illustrated imaging device 11 is an infrared camera that captures infrared light and captures an image. As shown in FIG. 1, the imaging device 11 includes a housing 13 having an infrared inlet 12 and a blade drive device 10 that opens and closes the infrared inlet 12. The blade drive device 10 is used to perform calibration, which is temperature correction for an infrared sensor (not shown). In other words, with the infrared inlet 12 closed by the blade group 22 of the blade drive device 10, the infrared sensor can be imaged to calibrate the infrared sensor. The blade drive device 10 is also called a vane drive device or a curtain drive device.

[0010] <Blade drive unit structure> The structure of the blade driving device 10 will now be described. Fig. 2 is a perspective view showing the blade driving device 10, and Fig. 3 is an exploded perspective view showing the structure of the blade driving device 10. Fig. 4 is an exploded perspective view showing the structure of the drive unit 20 provided in the blade driving device 10, and Fig. 5 is a perspective view showing the rotor magnet 33 and drive arm 40 incorporated in the drive unit 20.

[0011] 2 and 3, the blade driving device 10 has a driving unit 20 consisting of a shutter base 21, and a blade group 22 assembled to the driving unit 20. As shown in Fig. 4, the driving unit 20 has a shutter base (base) 21 with an opening 21a, and an actuator 26 attached to a positioning shaft 25 of the shutter base 21. The actuator 26 has a substantially U-shaped core 29 with a pair of core pieces 27 and 28, a coil 30 wound around the core 29, and a controller 31 that controls the energization state of the coil 30. The actuator 26 is also rotatably attached to a support shaft 32 of the shutter base 21, and has a cylindrical rotor magnet (driving shaft) 33 arranged between the core pieces 27 and 28.

[0012] As shown in FIG. 5, a drive arm 40 having a pair of drive pins 41 and 42 is attached to the rotor magnet 33. The drive arm 40 includes an arm plate 43 extending in the radial direction Xa from the rotor magnet 33, a drive pin (first pin) 41 protruding from a front surface (one side) 43a of the arm plate 43, and a drive pin (second pin) 42 protruding from a rear surface (other side) 43b of the arm plate 43. The center line Cr of the rotor magnet 33 and the center line C1 of the drive pin 41 are parallel to each other, and the center line Cr of the rotor magnet 33 and the center line C2 of the drive pin 42 are parallel to each other. Furthermore, the distance (first distance) D1 from the center line Cr of the rotor magnet 33 to the center line C1 of the drive pin 41 and the distance (second distance) D2 from the center line Cr of the rotor magnet 33 to the center line C2 of the drive pin 42 are identical to each other. The center lines C1 and C2 overlap each other, and the drive pins 41 and 42 are arranged coaxially.

[0013] As shown in FIG. 4, the drive unit 20 has a link lever 35 rotatably attached to a support shaft 34 of the shutter base 21, and a link lever blade (second blade) 37 rotatably attached to a support shaft 36 of the shutter base 21. The link lever 35 has a pair of link pins 35a and 35b, and the link lever blade 37 has a pair of guide holes 37a and 37b. The drive pin 41 of the drive arm 40 is inserted into a through hole 50a of the partition plate 50, and the drive pin 42 of the drive arm 40 is inserted into the guide hole 37a of the link lever blade 37. The link pin 35a of the link lever 35 is inserted into the through hole 50b of the partition plate 50, and the link pin 35b of the link lever 35 is inserted into the guide hole 37b of the link lever blade 37. In other words, the drive arm 40 and the link lever 35 are connected to each other via the link lever blade 37.

[0014] 3, the blade group 22 assembled to the drive unit 20 has a shutter blade (first blade) 51 rotatably attached to the support shaft 45 of the shutter base 21, and shutter blades 52 and 53 rotatably attached to the support shaft 36 of the shutter base 21. The blade group 22 also has shutter blades 54 and 55 rotatably attached to the support shaft 46 of the shutter base 21, and a shutter blade 56 rotatably attached to the support shaft 47 of the shutter base 21. These shutter blades 51 to 56 are rotatable between an open position where they open the opening 21a of the shutter base 21 and a closed position where they close the opening 21a of the shutter base 21.

[0015] A drive pin 41 of the drive arm 40 is inserted into the guide holes 51a, 52a, and 53a of the shutter blades 51, 52, and 53. In other words, by rotating the drive arm 40 and moving the drive pin 41, the shutter blades 51 to 53 can be moved between the open position and the closed position. In addition, a link pin 35a of the link lever 35 is inserted into the guide holes 54a, 55a, and 56a of the shutter blades 54, 55, and 56. In other words, by rotating the link lever 35 and moving the link pin 35a, the shutter blades 54 to 56 can be moved between the open position and the closed position. A blade cover 57 having an opening 57a is attached to the shutter base 21.

[0016] <Blade drive unit operation> 6A and 6B are views showing the rotor magnet 33 and its vicinity, and FIGS. 7A and 7B are views showing the drive unit 20 with the partition plate 50 removed. Also, FIGS. 8A and 8B are views showing the blade drive device 10 with the blade cover 57 and the partition plate 50 removed. Note that FIGS. 6A, 7A, and 8A show the state when the shutter blades 51 to 56 have moved to the open position, and FIGS. 6B, 7B, and 8B show the state when the shutter blades 51 to 56 have moved to the closed position.

[0017] 6A, rotor magnet 33 disposed between core pieces 27 and 28 is magnetized to an N pole and an S pole. Controller 31 can switch between energizing and de-energizing coil 30, and can switch the direction of current flow through coil 30. That is, controller 31, which controls the energized state of coil 30, can magnetize core piece 27 to the N pole and magnetize core piece 28 to the S pole, and can magnetize core piece 27 to the S pole and magnetize core piece 28 to the N pole.

[0018] As shown in Fig. 6A, when core piece 27 is magnetized to the north pole and core piece 28 is magnetized to the south pole, rotor magnet 33 rotates in the direction of arrow OP1, and drive pins 41 and 42 move in the direction of arrow OP2. Also, as shown in Fig. 7A, when drive pin 42 moves in the direction of arrow OP2, link lever blade 37 moves link pin 35b in the direction of arrow OP3, and link pin 35a moves in the direction of arrow OP4.

[0019] 8A, when the drive pin 41 moves in the direction of the arrow OP2, the shutter blades 51 to 53 move in the direction of the arrow OP5 toward the open position. When the link pin 35a moves in the direction of the arrow OP4, the shutter blades 54 to 56 move in the direction of the arrow OP6 toward the open position. When the shutter blades 51 to 56 move to the open position, the controller 31 cuts off the power supply to the coil 30. Even when the power supply to the coil 30 is cut off, the rotor magnet 33 continues to be attracted to the core pieces 27 and 28, so the shutter blades 51 to 56 are held in the open position.

[0020] On the other hand, as shown in Fig. 6B, when core piece 27 is magnetized to the south pole and core piece 28 is magnetized to the north pole, rotor magnet 33 rotates in the direction of arrow CL1, and drive pins 41 and 42 move in the direction of arrow CL2. Also, as shown in Fig. 7B, when drive pin 42 moves in the direction of arrow CL2, link lever blade 37 moves link pin 35b in the direction of arrow CL3, and link pin 35a moves in the direction of arrow CL4.

[0021] 8B, when the drive pin 41 moves in the direction of the arrow CL2, the shutter blades 51 to 53 move in the direction of the arrow CL5 toward the closed position. When the link pin 35a moves in the direction of the arrow CL4, the shutter blades 54 to 56 move in the direction of the arrow CL6 toward the closed position. When the shutter blades 51 to 56 move to the closed position, the controller 31 cuts off the power to the coil 30. Even when the power to the coil 30 is cut off, the rotor magnet 33 continues to be attracted to the core pieces 27 and 28, so the shutter blades 51 to 56 are held in the closed position.

[0022] <Blade drive unit thickness> Fig. 9 is a cross-sectional view showing the blade driving device 10 taken along line IX-IX in Fig. 8A. Fig. 9 shows the blade driving device 10 with the blade cover 57 and the partition plate 50 attached.

[0023] 9, the drive arm 40 has a drive pin 41 that protrudes from a surface 43a of the arm plate 43, i.e., the drive pin 41 that protrudes on one side in the thickness direction of the arm plate 43. The drive arm 40 also has a drive pin 42 that protrudes from a back surface 43b of the arm plate 43, i.e., the drive pin 42 that protrudes on the other side in the thickness direction of the arm plate 43. Furthermore, the drive pin 41 of the drive arm 40 is inserted into the guide holes 51a to 53a of the shutter blades 51 to 53, and the drive pin 42 of the drive arm 40 is inserted into the guide hole 37a of the link lever blade 37.

[0024] That is, the drive arm 40 has a drive pin (first pin) 41 that protrudes from a front surface (one surface) 43a of the arm plate 43 and is inserted into a guide hole 51a of a shutter blade (first blade) 51. The drive arm 40 also has a drive pin (second pin) 42 that protrudes from a back surface (other surface) 43b of the arm plate 43 and is inserted into a guide hole 37a of a link lever blade (second blade) 37. As shown in FIGS. 3 and 4, the link lever blade 37 is connected to a shutter blade (third blade) 54 via a link lever 35. That is, in this embodiment, the shutter blade 51 may be referred to as a first blade, the link lever blade 37 may be referred to as a second blade, and the shutter blade 54 may be referred to as a third blade.

[0025] As described above, the drive arm 40 is provided with two drive pins 41, 42, and the shutter blade 51 and the link lever blade 37 are separately attached to the drive pins 41, 42, respectively, which enables a reduction in the thickness T1 of the blade drive device 10. That is, as shown in FIG. 9 , the shutter blade 51 and the link lever blade 37 are arranged to sandwich the arm plate 43, which enables a reduction in the number of blades attached to each of the drive pins 41, 42, thereby enabling a reduction in the thickness T1 of the blade drive device 10 and a reduction in size. For example, if only the drive pin 41 is provided on the drive arm 40 and both the shutter blade 51 and the link lever blade 37 are attached to this drive pin 41, the thickness T1 of the blade drive device 10 would increase by at least the thickness T2 of the link lever blade 37, but this problem can be solved.

[0026] <Variation 1> 9, the shutter blade 51 is attached to the drive pin 41 of the drive arm 40, and the link lever blade 37 is attached to the drive pin 42 of the drive arm 40, but this is not limiting. Here, FIG. 10 is a diagram simply showing a modified example of the blade attached to the drive arm 40.

[0027] 10, the drive pin 41 of the drive arm 40 is inserted into the guide holes 100a, 101a, and 102a of the shutter blades 100, 101, and 102. The drive pin 42 of the drive arm 40 is inserted into the guide holes 103a, 104a, and 105a of the shutter blades 103, 104, and 105. These shutter blades 100 to 105 are rotatably attached to the shutter base 21, similar to the shutter blades 51 to 56 described above. Similarly to the shutter blades 51 to 56 described above, the shutter blades 100 to 105 are rotatable between an open position that opens the opening 21a of the shutter base 21 and a closed position that closes the opening 21a.

[0028] That is, the drive arm 40 has a drive pin (first pin) 41 that protrudes from a front surface (one surface) 43a of the arm plate 43 and is inserted into a guide hole 100a of the shutter blade (first blade) 100. The drive arm 40 also has a drive pin (second pin) 42 that protrudes from a back surface (other surface) 43b of the arm plate 43 and is inserted into a guide hole 103a of the shutter blade (second blade) 103. That is, in this modified example, the shutter blade 100 may be referred to as a first blade, and the shutter blade 103 may be referred to as a second blade.

[0029] In this way, two drive pins 41 and 42 are provided on the drive arm 40, and the shutter blade 100 and the shutter blade 103 are separately attached to the drive pins 41 and 42. This makes it possible to achieve a thinner, more compact blade drive device, similar to the blade drive device 10 described above.

[0030] <Variation 2> 10, shutter blades 100-102 are attached to drive pin 41 of drive arm 40, and shutter blades 103-105 are attached to drive pin 42 of drive arm 40, but this is not limitative. Here, FIG. 11 is a diagram simply showing modified examples of blades attached to drive arm 40.

[0031] As shown in Fig. 11, the drive pin 41 of the drive arm 40 is inserted into a guide hole 110a of a link lever blade 110. Shutter blades 112, 113, and 114 are connected to the link lever blade 110 via a link lever 111. The drive pin 42 of the drive arm 40 is inserted into a guide hole 120a of a link lever blade 120. Shutter blades 122, 123, and 124 are connected to the link lever blade 120 via a link lever 121. These shutter blades 112 to 114 and 122 to 124 are rotatably attached to the shutter base 21, similar to the shutter blades 51 to 56 described above. Similarly to the shutter blades 51 to 56 described above, the shutter blades 112 to 114 and 122 to 124 are rotatable between an open position that opens the opening 21a of the shutter base 21 and a closed position that closes the opening 21a.

[0032] That is, the drive arm 40 protrudes from a front surface (one surface) 43a of the arm plate 43 and has a drive pin (first pin) 41 that is inserted into a guide hole 110a of a link lever blade (first blade) 110. The link lever blade 110 is connected to a shutter blade (third blade) 112 via a link lever 111. Similarly, the drive arm 40 protrudes from a back surface 43b (other surface) of the arm plate 43 and has a drive pin (second pin) 42 that is inserted into a guide hole 120a of a link lever blade (second blade) 120. The link lever blade 120 is connected to a shutter blade (fourth blade) 122 via a link lever 121. That is, in this modified example, the link lever blade 110 may be referred to as a first blade, and the link lever blade 120 may be referred to as a second blade. The shutter blade 112 may be referred to as a third blade, and the shutter blade 122 may be referred to as a fourth blade.

[0033] In this way, two drive pins 41, 42 are provided on the drive arm 40, and the link lever blade 110 and the link lever blade 120 are separately attached to the drive pins 41, 42. This makes it possible to achieve a thinner, more compact blade drive device, similar to the blade drive device 10 described above.

[0034] <Variation 3> 5, the center lines C1 and C2 of the drive pins 41 and 42 are aligned with each other, but this is not limitative and the center lines C1 and C2 of the drive pins 41 and 42 may be spaced apart. Here, FIG. 12 is a perspective view showing a drive arm 130 as a modified example.

[0035] 12, a drive arm 130 having a pair of drive pins 131, 132 is attached to the rotor magnet 33. The drive arm 130 has an arm plate 133 extending in the radial direction Xa from the rotor magnet 33. The drive arm 130 has a drive pin (first pin) 131 protruding from a front surface (one surface) 133a of the arm plate 133, and a drive pin (second pin) 132 protruding from a back surface (other surface) 133b of the arm plate 133.

[0036] The center line Cr of the rotor magnet 33 and the center line C1a of the drive pin 131 are parallel to each other, and the center line Cr of the rotor magnet 33 and the center line C2a of the drive pin 132 are parallel to each other. Furthermore, the distance (first distance) D1a from the center line Cr of the rotor magnet 33 to the center line C1a of the drive pin 131 and the distance (second distance) D2a from the center line Cr of the rotor magnet 33 to the center line C2a of the drive pin 132 are different from each other.

[0037] In this way, even if the distance D1a from the center line Cr to the center line C1a and the distance D2a from the center line Cr to the center line C2a are different from each other, the drive arm 130 can function in the same manner as the drive arm 40 described above. In other words, similar to the blade drive device 10 described above, a thinner, more compact blade drive device can be achieved. Furthermore, by making the distances D1a and D2a between the drive pins 131 and 132 different from each other, it becomes easy to adjust the rotation angles of the various blades connected to the drive pins 131 and 132. This simplifies the design of the blade drive device. Furthermore, since it is easy to adjust the rotational torque transmitted from the drive pins 131 and 132 to the various blades, this also simplifies the design of the blade drive device.

[0038] <Variation 4> 5, the center lines C1 and C2 of the drive pins 41 and 42 are arranged on the same imaginary plane, but this is not limiting, and the center lines C1 and C2 of the drive pins 41 and 42 may be arranged so as to be offset in the circumferential direction of the rotor magnet 33. Similarly, in the example shown in Fig. 12, the center lines C1a and C2a of the drive pins 131 and 132 are arranged on the same imaginary plane, but this is not limiting, and the center lines C1a and C2a of the drive pins 131 and 132 may be arranged so as to be offset in the circumferential direction of the rotor magnet 33. Here, Fig. 13 is a plan view showing a drive arm 140 as a modified example.

[0039] 13, a drive arm 140 having a pair of drive pins 141, 142 is attached to the rotor magnet 33. The drive arm 140 has an arm plate 143 extending in the radial direction Xa from the rotor magnet 33. The drive arm 140 has a drive pin (first pin) 141 protruding from a front surface (one surface) 143a of the arm plate 143, and a drive pin (second pin) 142 protruding from a back surface (other surface) 143b of the arm plate 143. The drive pin 141 and the drive pin 142 are spaced apart from each other in the circumferential direction Xb of the rotor magnet 33.

[0040] The center line Cr of the rotor magnet 33 and the center line C1b of the drive pin 141 are parallel to each other, and the center line Cr of the rotor magnet 33 and the center line C2b of the drive pin 142 are parallel to each other. Furthermore, the distance (first distance) D1b from the center line Cr of the rotor magnet 33 to the center line C1b of the drive pin 141 and the distance (second distance) D2b from the center line Cr of the rotor magnet 33 to the center line C2b of the drive pin 142 are equal to each other.

[0041] In this way, even when the center lines C1b, C2b of the drive pins 141, 142 are spaced apart from each other in the circumferential direction Xb of the rotor magnet 33, the drive arm 140 can function in the same manner as the drive arm 40 described above. In other words, similar to the blade drive device 10 described above, it is possible to achieve a thinner, more compact blade drive device. Furthermore, by shifting the drive pins 141, 142 in the circumferential direction Xb, it is possible to appropriately adjust the design conditions of the various blades connected to the drive pins 141, 142, making it easier to design the blade drive device.

[0042] <Variation 5> In the example shown in Fig. 13, the center lines C1b and C2b of the drive pins 141 and 142 are spaced apart in the circumferential direction Xb, and the distances D1b and D2b of the drive pins 141 and 142 are aligned with each other, but this is not limiting. Fig. 14 is a plan view showing a drive arm 150 as a modified example.

[0043] 14, a drive arm 150 having a pair of drive pins 151, 152 is attached to the rotor magnet 33. The drive arm 150 has an arm plate 153 extending in the radial direction Xa from the rotor magnet 33. The drive arm 150 has a drive pin (first pin) 151 protruding from a front surface (one surface) 153a of the arm plate 153, and a drive pin (second pin) 152 protruding from a back surface (other surface) 153b of the arm plate 153. The drive pin 151 and the drive pin 152 are spaced apart from each other in the circumferential direction Xb of the rotor magnet 33.

[0044] The center line Cr of the rotor magnet 33 and the center line C1c of the drive pin 151 are parallel to each other, and the center line Cr of the rotor magnet 33 and the center line C2c of the drive pin 152 are parallel to each other. Furthermore, the distance (first distance) D1c from the center line Cr of the rotor magnet 33 to the center line C1c of the drive pin 151 and the distance (second distance) D2c from the center line Cr of the rotor magnet 33 to the center line C2c of the drive pin 152 are different from each other.

[0045] In this way, even when the center lines C1c, C2c of the drive pins 151, 152 are spaced apart in the circumferential direction Xb of the rotor magnet 33 and the distances D1c, D2c of the drive pins 151, 152 are made different from each other, the drive arm 150 can function in the same manner as the drive arm 40 described above. In other words, similar to the blade drive device 10 described above, it is possible to achieve a thinner, more compact blade drive device. Furthermore, by shifting the drive pins 151, 152 in the circumferential direction Xb and making the distances D1c, D2c of the drive pins 151, 152 different from each other, it is possible to appropriately adjust the design conditions of the various blades connected to the drive pins 151, 152, and thus facilitate the design of the blade drive device.

[0046] <Other variations> The present disclosure is not limited to the above-described embodiment and may be modified in various ways without departing from the spirit and scope of the present disclosure. In the above description, an infrared camera is used as an example of the imaging device 11 to which the blade driving device 10 is attached. However, this is not limited thereto, and the imaging device may also be an imaging device that captures visible light. In the above description, the blade driving device 10 is used as a shutter device. However, this is not limited thereto, and the blade driving device 10 may also be used as an aperture device. In the illustrated example, six shutter blades are used, but this is not limited thereto. For example, the opening 21a may be opened and closed using one shutter blade, or two shutter blades may be used to open and close the opening 21a.

[0047] When using the drive arms 130, 140, 150 shown in Figures 12, 13, and 14, shutter blades may be attached to the drive pins 131, 141, 151, and shutter blades may be attached to the drive pins 132, 142, 152. Alternatively, link lever blades may be attached to the drive pins 131, 141, 151, and shutter blades may be attached to the drive pins 132, 142, 152. Alternatively, shutter blades may be attached to the drive pins 131, 141, 151, and link lever blades may be attached to the drive pins 132, 142, 152. Alternatively, link lever blades may be attached to the drive pins 131, 141, 151, and link lever blades may be attached to the drive pins 132, 142, 152.

[0048] 12 and 14, a link lever blade may be attached to the drive pin 131, 151 closer to the center line Cr, while a shutter blade may be attached to the drive pin 132, 152 farther from the center line Cr. In other words, since the shutter blade is connected to the link lever blade via the link lever, it is expected that the load acting on the link lever blade will be large. For this reason, the link lever blade may be attached to the drive pin 131, 151 closer to the center line Cr, i.e., the drive pin 131, 151 that outputs a large rotational torque.

[0049] 5, the diameters of drive pins 41 and 42 are set to be the same, but this is not limiting, and drive pins 41 and 42 may have different diameters. For example, because shutter blades 54 to 56 are connected to drive pin 42 via link lever blade 37 and link lever 35, it is possible that the load acting on drive pin 42 will be greater than that on drive pin 41. In this case, the diameter of drive pin 42 may be made larger than that of drive pin 41, thereby making drive pin 42 stronger than drive pin 41.

[0050] The present technology can be configured as follows. [1] a base having an opening; a first blade rotatably mounted to the base; a second blade rotatably mounted to the base; an actuator attached to the base; a drive arm attached to a drive shaft of the actuator; and The drive arm an arm plate extending radially from the drive shaft; a first pin that protrudes from one surface of the arm plate and is inserted into a guide hole of the first blade; a second pin protruding from the other surface of the arm plate and inserted into a guide hole of the second blade; Equipped with Blade drive unit. [2] In the blade driving device described in [1] above, the first blade is rotatable between an open position that opens the opening and a closed position that closes the opening; The second blade is rotatable between an open position that opens the opening and a closed position that closes the opening. Blade drive unit. [3] In the blade driving device described in [1] above, a third blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; a fourth blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; and the first blade is connected to the third blade; The second blade is connected to the fourth blade. Blade drive unit. [4] In the blade driving device described in [1] above, a third blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; and the first blade is rotatable between an open position that opens the opening and a closed position that closes the opening; The second blade is connected to the third blade. Blade drive unit. [5] In the blade driving device according to any one of [1] to [4], the center line of the drive shaft and the center line of the first pin are parallel to each other, the center line of the drive shaft and the center line of the second pin are parallel to each other, a first distance from the center line of the drive shaft to the center line of the first pin and a second distance from the center line of the drive shaft to the center line of the second pin are different from each other; Blade drive unit. [6] In the blade driving device according to any one of [1] to [4], the center line of the drive shaft and the center line of the first pin are parallel to each other, the center line of the drive shaft and the center line of the second pin are parallel to each other, a first distance from the center line of the drive shaft to the center line of the first pin and a second distance from the center line of the drive shaft to the center line of the second pin are equal to each other; Blade drive unit. [Explanation of symbols]

[0051] 10...blade drive device, 21...shutter base (base), 21a...opening, 26...actuator, 33...rotor magnet (drive shaft), 37...link lever blade (second blade), 37a...guide hole, 40...drive arm, 41...drive pin (first pin), 42...drive pin (second pin), 43...arm plate, 43a...surface (one side), 43b...back side (other side), 51...shutter blade (first blade), 51a...guide hole, 54...shutter blade (third blade), 100...shutter blade (first blade), 100a...guide hole, 103...shutter blade (second blade), 103a...guide hole, 110...link lever blade (first blade), 110a...guide hole, 112...shutter blade (third blade), 120...link lever blade (second blade), 120a...guide hole, 122...shutter blade (fourth blade), 130...drive arm, 131...drive pin (first pin), 132...drive pin (second pin), 133...arm plate, 133a...surface (one side), 133b...back side (other side), 140...drive arm, 141...drive pin (first pin), 142...drive pin (second pin), 143...arm plate, 143a...surface (one side), 143b ...back surface (other surface), 150...drive arm, 151...drive pin (first pin), 152...drive pin (second pin), 153...arm plate, 153a...front surface (one surface), 153b...back surface (other surface), Cr, C1, C2, C1a, C2a, C1b, C2b, C1c, C2c...center line, D1, D1a, D1b, D1c...distance (first distance), D2, D2a, D2b, D2c...distance (second distance), Xa...radial direction

Claims

1. a base having an opening; a first blade rotatably mounted to the base; a second blade rotatably mounted to the base; an actuator attached to the base; a drive arm attached to a drive shaft of the actuator; and The drive arm an arm plate extending radially from the drive shaft; a first pin protruding from one surface of the arm plate and inserted into a guide hole of the first blade; a second pin protruding from the other surface of the arm plate and inserted into a guide hole of the second blade; Equipped with Blade drive unit.

2. The blade drive device according to claim 1, the first blade is rotatable between an open position that opens the opening and a closed position that closes the opening; The second blade is rotatable between an open position that opens the opening and a closed position that closes the opening. Blade drive unit.

3. The blade drive device according to claim 1, a third blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; a fourth blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; and the first blade is connected to the third blade; The second blade is connected to the fourth blade. Blade drive unit.

4. The blade drive device according to claim 1, a third blade rotatably attached to the base and configured to rotate between an open position that opens the opening and a closed position that closes the opening; and the first blade is rotatable between an open position that opens the opening and a closed position that closes the opening; The second blade is connected to the third blade. Blade drive unit.

5. The blade drive device according to claim 1, a center line of the drive shaft and a center line of the first pin are parallel to each other; a center line of the drive shaft and a center line of the second pin are parallel to each other; a first distance from a center line of the drive shaft to a center line of the first pin and a second distance from the center line of the drive shaft to a center line of the second pin are different from each other; Blade drive unit.

6. The blade drive device according to claim 1, a center line of the drive shaft and a center line of the first pin are parallel to each other; a center line of the drive shaft and a center line of the second pin are parallel to each other; a first distance from a center line of the drive shaft to a center line of the first pin and a second distance from the center line of the drive shaft to a center line of the second pin are equal to each other; Blade drive unit.

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