Vane driving apparatus

Abstract

To provide a vane driving apparatus capable of increasing a holding force for maintaining the open or closed state of a vane and improving the durability of the vane.SOLUTION: The vane driving apparatus includes a link member 50 configured to synchronously operate a first vane 60 and a second vane 80. The link member 50 includes: a first link arm 51 to which a first operation long hole 63b and an output part 97b are connected; a second link arm 52 to which a second operation long hole 83b is connected; and a first angular portion CN1 mounted on a link shaft 25d, for connecting the first link arm 51 and the second link arm 52. A base member 20 is provided with an opening-side stopper portion 26a and a closing-side stopper portion 27a for restricting the rotation angle of the link member 50.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] For example, Patent Document 1 describes an optical device that includes a base plate having an opening, a plurality of shutter blades that open and close the opening, and a rotor drive shaft that opens and closes the plurality of shutter blades. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-195084 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, multiple shutter blades are connected to a rotor drive shaft, and the opening and closing conditions (aperture conditions) of the multiple shutter blades are adjusted by rotating the rotor drive shaft. Therefore, when a large external force such as an impact is applied, the holding force of the rotor drive shaft to hold the shutter blades is insufficient, and there is a risk that the shutter blades will rattle. In particular, if the shutter blades are wide open, they may open even wider and collide with the side wall of the base plate.

[0005] An object of the present disclosure is to provide a blade drive device that can increase the holding force that holds the blades in the open / closed state and improve the durability of the blades. [Means for solving the problem]

[0006] The present disclosure provides a fan assembly comprising: a base member having an opening; a first blade and a second blade rotatably attached to a first blade shaft and a second blade shaft provided on the base member, respectively, and configured to open and close the opening; a link member rotatably attached to a link shaft provided on the base member, and configured to synchronize the operation of the first blade and the second blade; and an actuator provided on the base member and configured to have an output portion for rotating the link member, wherein the link member comprises: a first link arm provided on one longitudinal side of the link member, and configured to connect a first blade connecting portion provided on the first blade and the output portion; a second link arm provided on the other longitudinal side of the link member, and configured to connect a second blade connecting portion provided on the second blade; and a link shaft mounting portion connecting the first link arm and the second link arm and mounted on the link shaft, and the base member is provided with a stopper portion for restricting the rotation angle of the link member. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to realize a blade drive device that can increase the holding force that holds the blades in the open / closed state and improve the durability of the blades. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a view of the blade drive device of the first embodiment as seen from the front side. [Figure 2] FIG. 2 is a rear view of the blade drive device of FIG. [Figure 3] FIG. 3 is an exploded perspective view of the blade drive device of FIG. [Figure 4] FIG. 4 is a perspective view showing the base member alone. [Figure 5] FIG. 5 is a perspective view showing the link member alone. [Figure 6] FIG. 6 is a perspective view showing the first and second blades individually. [Figure 7] FIG. 7 is a perspective view showing the actuator alone. [Figure 8] FIG. 8 is a diagram illustrating the opening operation of the blade drive device of FIG. [Figure 9] FIG. 9 is a diagram illustrating the closing operation of the blade drive device of FIG. [Figure 10] FIG. 10 is a perspective view showing the base member according to the second embodiment alone. [Figure 11] FIG. 11 is a perspective view showing the link member according to the second embodiment alone. [Figure 12] FIG. 12 is a diagram illustrating the opening operation of the blade drive device according to the second embodiment. [Figure 13] FIG. 13 is a diagram illustrating the closing operation of the blade drive device according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the drawings.

[0010] <First Embodiment> 1 is a view of the blade drive device of embodiment 1 as seen from the front side, FIG. 2 is a view of the blade drive device of FIG. 1 as seen from the back side, FIG. 3 is an exploded perspective view of the blade drive device of FIG. 1, FIG. 4 is a perspective view showing the base member alone, FIG. 5 is a perspective view showing the link member alone, FIG. 6 is a perspective view showing the first and second blades alone, FIG. 7 is a perspective view showing the actuator alone, FIG. 8 is a diagram explaining the opening operation of the blade drive device of FIG. 1, and FIG. 9 is a diagram explaining the closing operation of the blade drive device of FIG. 1.

[0011] <Blade drive device> 1 to 3 is a shutter device for an infrared camera used in, for example, a surveillance camera. The entire blade drive device 10 is formed in a substantially circular disk shape, and an example of the size of the blade drive device 10 is that the outer diameter of the base member 20 is about 30 mm, the inner diameter of the opening 21a (see FIGS. 2 and 3) is about 12.5 mm, and the thickness of the base member 20 is about 3 mm.

[0012] As described above, the blade drive device 10 is a small device that is placed near the lens of the camera, and therefore miniaturization and weight reduction of the components of the blade drive device 10 are both important requirements.

[0013] <Housing> 1 to 4, the blade drive device 10 includes a housing 11 that forms the outer shell of the blade drive device 10. The housing 11 includes a base member 20 and a cover member 40.

[0014] The base member 20 is formed into a substantially circular plate shape by injection molding a resin material such as plastic. By making the base member 20 out of resin, the overall weight of the blade drive device 10 is reduced. The base member 20 includes a bottom wall 21 having an opening 21a in the center, and a side wall 22 integrally formed on the outer periphery of the bottom wall 21. The opening 21a formed in the base member 20 can be opened and closed by the first blade 60 and the second blade 80.

[0015] Side wall portion 22 extends in the axial direction of base member 20 and is provided over the entire circumferential area of ​​base member 20. An accommodation chamber 23 that accommodates components such as first blade 60, second blade 80, and link member 50 is formed inside base member 20, surrounded by bottom wall portion 21 and side wall portion 22. In other words, side wall portion 22 covers first blade 60, second blade 80, and link member 50 when base member 20 is viewed from a direction perpendicular to its axial direction.

[0016] A base opening 24 is formed on the axial side of base member 20 opposite bottom wall portion 21. Base opening 24 is closed by cover member 40. As a result, as shown in FIG. 1 , the components housed in housing chamber 23 (first blade 60, second blade 80, link member 50, etc.) are covered and hidden, and dust and the like are prevented from entering inside housing chamber 23.

[0017] Here, cover member 40 is made of a thin metal plate such as stainless steel, and is fixed to base member 20 by a total of three first fixing screws S1. Furthermore, cover member 40 has a cover opening 41 in the center thereof, which has the same diameter as opening 21a of base member 20, and cover opening 41 can also be opened and closed by first blade 60 and second blade 80.

[0018] <Base material> 3, the housing chamber 23 of the base member 20 houses the link member 50, the first blade 60, the partition plate 70, and the second blade 80. Specifically, in the axial direction of the base member 20, the link member 50, the first blade 60, the partition plate 70, and the second blade 80 are arranged in this order from the bottom wall portion 21 side toward the base opening 24 side.

[0019] Here, the three components, link member 50, first blade 60, and second blade 80, are each rotatable in the radial direction of base member 20 inside accommodation chamber 23. Furthermore, partition plate 70 has the function of preventing first blade 60 and second blade 80 from interfering with each other when opening and closing, thereby allowing first and second blade 60 and 80 to open and close smoothly. Specifically, partition plate 70 is formed from a resin film or a thin metal plate with a smooth surface.

[0020] <Link member storage section> 4, a link member accommodating portion 25 is provided in the accommodating chamber 23. The link member accommodating portion 25 is disposed at the deepest recessed position from the base opening 24 side of the base member 20 toward the bottom wall portion 21 side. The link member accommodating portion 25 is formed in a substantially arc shape when the base member 20 is viewed from the axial direction, and is disposed over approximately half the range (a range of approximately 180 degrees) in the circumferential direction of the opening 21a.

[0021] The link member accommodating portion 25 includes a first linear recess 25a, a second linear recess 25b, and a third linear recess 25c. Specifically, the second and third linear recesses 25b, 25c are connected to both longitudinal sides of the first linear recess 25a so that the interior angle is approximately 120 degrees. In other words, the link member accommodating portion 25 is formed in a substantially arc shape with two corners.

[0022] A link member 50 (see FIGS. 3 and 5) having two corners and formed in a generally arcuate shape, similar to the link member accommodating portion 25, is rotatably accommodated inside the link member accommodating portion 25. A link shaft 25d is provided at the connection between the first linear recess 25a and the third linear recess 25c, and the link shaft 25d extends from the bottom wall portion 21 side of the base member 20 toward the base opening 24 side. A link mounting hole 53 (see FIG. 5) of the link member 50 is rotatably mounted on the link shaft 25d, thereby allowing the link member 50 to rotate about the first axis C1.

[0023] Furthermore, first linear recess 25a includes first opposing wall 26 and second opposing wall 27 disposed opposite each other in the rotation direction of link member 50, i.e., in a direction perpendicular to the axial direction of base member 20. First opposing wall 26 is provided with an open-side stopper portion (stopper portion) 26a against which link member 50 abuts, and second opposing wall 27 is provided with a close-side stopper portion (stopper portion) 27a against which link member 50 abuts.

[0024] Specifically, the opening-side stopper portion 26a and the closing-side stopper portion 27a protrude at a predetermined height in the opposing direction from the first opposing wall 26 and the second opposing wall 27. Furthermore, the opening-side stopper portion 26a and the closing-side stopper portion 27a are disposed inside the first linear recess 25a and closer to the second linear recess 25b.

[0025] When first blade 60 and second blade 80 are in the open state, opening-side abutment surface SF1 of first link arm 51 of link member 50 abuts in surface contact against opening-side stopper portion 26a (see FIG. 8). When first blade 60 and second blade 80 are in the closed state, closing-side abutment surface SF2 of first link arm 51 of link member 50 abuts in surface contact against closing-side stopper portion 27a (see FIG. 9).

[0026] In this manner, the opening-side stopper portion 26a and the closing-side stopper portion 27a provided on the base member 20 have the function of restricting the rotation angle of the link member 50.

[0027] 4, an arc-shaped through-hole 25e is provided on the opposite side of the second linear recess 25b in the longitudinal direction from the first linear recess 25a side, penetrating the bottom wall 21. An output portion 97b (see FIG. 7) of an actuator 90 fixed to the opposite side (back side) of the bottom wall 21 from the accommodation chamber 23 side (front side) is inserted into the arc-shaped through-hole 25e, and the output portion 97b is moved inside the arc-shaped through-hole 25e by driving the actuator 90.

[0028] Furthermore, the tip side of the output portion 97b exposed inside the second linear recess 25b is coupled to the arc hole 51a (see FIG. 5) of the link member 50 housed inside the link member housing portion 25. In other words, the actuator 90 fixed to the base member 20 includes the output portion 97b that rotates the link member 50 inside the link member housing portion 25.

[0029] <First blade housing section> 4, accommodation chamber 23 is provided with first blade accommodation section 28 that accommodates first blade 60. First blade accommodation section 28 is arranged closer to base opening 24 than link member accommodation section 25, and is arranged on the opposite side of link member accommodation section 25 with opening 21a as the center. In other words, first blade accommodation section 28 is arranged at a different position from link member accommodation section 25 in the axial direction of base member 20, and first blade accommodation section 28 faces link member accommodation section 25 with opening 21a as the center in a direction perpendicular to the axial direction of base member 20.

[0030] A first blade shaft 28a is provided in the first blade housing 28, and the first blade shaft 28a extends from the bottom wall 21 side of the base member 20 toward the base opening 24 side. Specifically, the first blade shaft 28a is disposed in the vicinity of the arc-shaped through-hole 25e of the link member housing 25. A first blade 60 is rotatably attached to the first blade shaft 28a, so that the first blade 60 is rotatable around the second axis C2 inside the first blade housing 28.

[0031] Here, first blade shaft 28a and arc-shaped through-hole 25e face first blade operating portion 62 of first blade 60 in the axial direction of base member 20. First blade mounting hole 63a (see FIG. 6) of first blade operating portion 62 is rotatably mounted on first blade shaft 28a. First operating elongated hole 63b (see FIG. 6) of first blade operating portion 62 is coupled to output portion 97b (see FIG. 7) inserted through arc-shaped through-hole 25e.

[0032] As a result, by driving the output portion 97b of the actuator 90, the first blade 60 is rotated inside the first blade housing portion 28. In other words, the first blade 60 opens and closes approximately half of one radial side of the opening 21a of the base member 20.

[0033] Here, as shown in Fig. 8, when the opening-side abutment surface SF1 of the link member 50 abuts against the opening-side stopper portion 26a, the first blade 60 approaches the side wall portion 22 of the base member 20, but the first blade 60 does not come into contact with the side wall portion 22. Specifically, a minute gap (gap) G1 is formed between the first blade 60 and the side wall portion 22. Furthermore, as shown in Fig. 9, when the closing-side abutment surface SF2 of the link member 50 abuts against the closing-side stopper portion 27a, the first blade 60 closes approximately half of one radial side of the opening 21a of the base member 20. At this time, the first blade 60 does not come into contact with anything.

[0034] In other words, the first blade 60, which rotates inside the first blade housing portion 28, does not come into contact with the base member 20 or other components on either side of its rotation direction. Therefore, the first blade 60 can rotate smoothly, and damage to the first blade 60 is reliably prevented.

[0035] <Second blade housing section> 4, second blade housing section 29 is provided in housing chamber 23. Second blade housing section 29 is provided closer to base opening 24 than first blade housing section 28, and is arranged so as to overlap link member housing section 25 in the axial direction of base member 20. In other words, link member housing section 25, first blade housing section 28, and second blade housing section 29 provided in housing chamber 23 are arranged at different positions in the axial direction of base member 20. Specifically, link member housing section 25, first blade housing section 28, and second blade housing section 29 are arranged hierarchically in this order from the bottom wall section 21 side toward the base opening 24 side.

[0036] Further, the second blade housing portion 29 faces the first blade housing portion 28 in a direction perpendicular to the axial direction of the base member 20, with the opening 21a as the center.

[0037] A second blade shaft 29a is provided in the second blade housing portion 29, and the second blade shaft 29a extends from the bottom wall portion 21 side of the base member 20 toward the base opening 24 side. Specifically, the second blade shaft 29a is disposed in the vicinity of the opposite side of the third linear recess 25c from the link shaft 25d side in the longitudinal direction of the third linear recess 25c. The second blade 80 is rotatably attached to the second blade shaft 29a, so that the second blade 80 is rotatable around the third axis C3 inside the second blade housing portion 29.

[0038] Here, second blade shaft 29a of second blade housing portion 29 and operation protrusion 54 (see FIG. 5) of link member 50 housed in link member housing portion 25 are disposed close to each other. Furthermore, second blade shaft 29a and operation protrusion 54 face second blade operating portion 82 of second blade 80 in the axial direction of base member 20. Second blade mounting hole 83a (see FIG. 6) of second blade operating portion 82 is rotatably mounted on second blade shaft 29a. Furthermore, second operation elongated hole 83b (see FIG. 6) of second blade operating portion 82 is connected to operation protrusion 54.

[0039] As a result, by driving the link member 50 with the actuator 90, the second blade 80 is rotated inside the second blade housing portion 29. In other words, the second blade 80 opens and closes approximately the other radial half of the opening 21a of the base member 20.

[0040] 8, when the opening-side abutment surface SF1 of the link member 50 abuts against the opening-side stopper portion 26a, the second blade 80 approaches the side wall portion 22 of the base member 20, but similar to the first blade 60, the second blade 80 does not come into contact with the side wall portion 22. Specifically, a minute gap (gap) G2 is formed between the second blade 80 and the side wall portion 22. Also, as shown in FIG. 9, when the closing-side abutment surface SF2 of the link member 50 abuts against the closing-side stopper portion 27a, the second blade 80 closes approximately the other radial half of the opening 21a of the base member 20. At this time, similar to the first blade 60, the second blade 80 does not come into contact with anything.

[0041] That is, the second blade 80, which rotates inside the second blade housing portion 29, does not come into contact with the base member 20 or other components on either side of its rotation direction. Therefore, the second blade 80 can rotate smoothly in the same way as the first blade 60, and damage to the second blade 80 is reliably prevented.

[0042] <Link material> 5, the link member 50 is made of a resin material such as plastic and is formed in a generally arcuate shape having two corners. A first link arm 51 is provided on one longitudinal side of the link member 50 (the right side in the figure), and a second link arm 52 is provided on the other longitudinal side of the link member 50 (the left side in the figure).

[0043] Furthermore, a first corner portion (protrusion, link shaft mounting portion) CN1 is provided between the first link arm 51 and the second link arm 52. That is, the first corner portion CN1 has the function of connecting the first link arm 51 and the second link arm 52. The interior angle between the first link arm 51 and the second link arm 52 is approximately 120 degrees, and the first corner portion CN1 is provided with a link mounting hole 53 that is rotatably supported by the link shaft 25d (see FIG. 4) of the link member accommodating portion 25.

[0044] Specifically, the first corner CN1 provided on the link member 50 is a protrusion that protrudes radially outward from the opening 21a, and is rotatably attached to the link shaft 25d.

[0045] Furthermore, the length of the first link arm 51 is greater than the length of the second link arm 52, and an arc-shaped hole 51a is provided on one longitudinal side (tip side) of the first link arm 51. The arc-shaped hole 51a extends in the longitudinal direction of the first link arm 51 and penetrates the first link arm 51 in the thickness direction (the direction in which the first axis C1 extends). An output portion 97b of the actuator 90 is connected to the arc-shaped hole 51a.

[0046] As a result, the link member 50 is rotatable around the link mounting hole 53 (first axis C1) inside the link member accommodating portion 25 as the output portion 97b (see FIG. 7) is driven. Here, the output portion 97b is connected to both the first operation elongated hole 63b (see FIG. 6) of the first blade 60 and the arc-shaped hole 51a of the link member 50. In other words, the arc-shaped hole 51a of the first link arm 51 is connected to both the output portion 97b of the actuator 90 and the first operation elongated hole 63b of the first blade 60 via the output portion 97b.

[0047] Furthermore, a second corner CN2 is provided between the arc hole 51a and the link attachment hole 53 in the longitudinal direction of the first link arm 51. The second corner CN2 is located closer to one side in the longitudinal direction of the first link arm 51. In other words, the second corner CN2 is located closer to the arc hole 51a than the link attachment hole 53. The interior angle of the second corner CN2 is also approximately 120 degrees.

[0048] Here, similar to the first corner CN1, the second corner CN2 provided on the link member 50 also forms a protrusion that protrudes radially outward from the opening 21a.

[0049] In this way, by providing the second corner portion CN2 on the first link arm 51, which is longer than the second link arm 52, the entire link member 50 is made to have a substantially arc shape. This makes it possible to arrange the link member 50 over approximately half the range in the circumferential direction of the opening 21a provided in the base member 20 (see FIGS. 8 and 9).

[0050] Here, one longitudinal side of the first link arm 51 is accommodated in the second linear recess 25b of the link member accommodating portion 25, and the other longitudinal side (base end side) of the first link arm 51 is accommodated in the first linear recess 25a of the link member accommodating portion 25.

[0051] 5, 8, and 9, an opening-side abutment surface SF1 and a closing-side abutment surface SF2 are provided on both sides of the first link arm 51 in the rotational direction. When the link member 50 is accommodated in the link member accommodating portion 25, the opening-side abutment surface SF1 near the second corner portion CN2 faces the opening-side stopper portion 26a of the base member 20. On the other hand, the closing-side abutment surface SF2 near the second corner portion CN2 faces the closing-side stopper portion 27a of the base member 20.

[0052] Furthermore, the open-side abutment surface SF1 of the link member 50 is capable of surface contact with the open-side stopper portion 26a of the base member 20, and the closed-side abutment surface SF2 of the link member 50 is capable of surface contact with the closed-side stopper portion 27a of the base member 20. As a result, the rotation angle of the link member 50 is restricted by the open-side stopper portion 26a and the closed-side stopper portion 27a, and since the link member 50 and the base member 20 are in surface contact with each other, stress concentration at the time of abutment can be avoided compared to, for example, point contact. This improves the durability of the blade drive device 10.

[0053] When the opening-side abutment surface SF1 and the opening-side stopper portion 26a come into surface contact with each other, the first blade 60 and the second blade 80 are in the open state (see FIG. 8). When the closing-side abutment surface SF2 and the closing-side stopper portion 27a come into surface contact with each other, the first blade 60 and the second blade 80 are in the closed state (see FIG. 9).

[0054] Furthermore, an operation protrusion 54 that protrudes in the axial direction of the first axis C1 is integrally provided on the other longitudinal side (tip side) of the second link arm 52. Specifically, the operation protrusion 54 is formed in a cylindrical shape and extends toward the second blade 80 (upward in FIG. 3). The operation protrusion 54 is connected to a second operation elongated hole 83b (see FIG. 6) of the second blade operation portion 82.

[0055] As a result, when link member 50 is rotated by output portion 97b, first blade 60 and second blade 80 are rotated in synchronization. In this manner, link member 50 has the function of causing first blade 60 and second blade 80 to operate in synchronization.

[0056] <First and second wings> 1 to 3 and 6, the first and second blades 60, 80 have the same shape. However, when the first and second blades 60, 80 are attached to the base member 20, the first blade 60 is attached in the forward direction and the second blade 80 is attached in the reverse direction. In other words, the first and second blades 60, 80 are attached to the base member 20 with their front and backs facing in opposite directions. This eliminates the need for dedicated designs for the first and second blades 60, 80, improving the use of standardized parts and ease of assembly.

[0057] As shown in Fig. 6, the first and second blades 60, 80 are formed in a substantially semicircular shape from a resin film or a thin metal plate having a smooth surface, similar to the partition plate 70 (see Fig. 3). Specifically, the first and second blades 60, 80 include first and second blade main bodies 61, 81 and first and second blade operating units 62, 82, respectively. The first and second blade main bodies 61, 81 are formed in a substantially semicircular shape, and these first and second blade main bodies 61, 81 function as shutter units that open and close the opening 21a (see Figs. 4 and 9) of the bottom wall unit 21 provided in the base member 20.

[0058] 6 indicate the boundaries between the first and second blade main bodies 61 and 81 and the first and second blade operating sections 62 and .

[0059] The first and second blade operating parts 62, 82 are parts that are operated by the output part 97b (see FIG. 7) of the actuator 90 that opens and closes the first and second blades 60, 80, and the operating protrusion 54 (see FIG. 5) of the link member 50. Specifically, first and second reinforcing parts 63, 83 that are thicker than the first and second blade main bodies 61, 81, respectively, are fixed to the first and second blade operating parts 62, 82. The output part 97b of the actuator 90 and the operating protrusion 54 of the link member 50 are then connected to the first and second reinforcing parts 63, 83.

[0060] In this way, by connecting the output portion 97b of the actuator 90 and the operation protrusion 54 of the link member 50 to the first and second reinforcing portions 63, 83, the durability of the first and second blades 60, 80 is improved.

[0061] The first and second reinforcing portions 63 and 83 that form the first and second blade operating portions 62 and 82 are provided with first and second blade mounting holes 63a and 83a, respectively. Specifically, the first and second blade mounting holes 63a and 83a are disposed near corners of the first and second reinforcing portions 63 and 83, which are formed in a substantially L-shape, and penetrate in the direction in which the second and third axes C2 and C3 extend. The first and second blade mounting holes 63a and 83a have a circular cross-sectional shape along a direction perpendicular to the direction in which the second and third axes C2 and C3 extend. The first and second blade mounting holes 63a and 83a are rotatably mounted on the first and second blade shafts 28a and 29a (see FIG. 4) provided on the base member 20, respectively, without any rattle.

[0062] Furthermore, the first and second reinforcing portions 63 and 83 are provided with a first operation elongated hole (first blade connecting portion) 63b and a second operation elongated hole (second blade connecting portion) 83b. These first and second operation elongated holes 63b and 83b penetrate in the direction in which the second and third axes C2 and C3 extend. The first and second operation elongated holes 63b and 83b have a substantially elliptical shape along a direction perpendicular to the direction in which the second and third axes C2 and C3 extend. The output portion 97b of the actuator 90 movably fits inside the first operation elongated hole 63b, and the operation protrusion 54 of the link member 50 movably fits inside the second operation elongated hole 83b. In other words, the first and second operation elongated holes 63b and 83b serve as connecting portions between the actuator 90 (see FIG. 7) and the link member 50.

[0063] 6, the first and second reinforcing portions 63, 83 are provided with other elongated holes LH1, LH2, respectively. The elongated hole LH1 of the first reinforcing portion 63 is a elongated hole that functions as the second operation elongated hole 83b of the second blade 80 when the first blade 60 is used as the second blade. On the other hand, the elongated hole LH2 of the second reinforcing portion 83 is a elongated hole that functions as the first operation elongated hole 63b of the first blade 60 when the second blade 80 is used as the first blade. Forming the first and second blades 60, 80 in this manner allows for the use of common components.

[0064] <Actuator> 7, the actuator 90 includes a base 91 formed in a generally crescent shape, a drive unit 92, and a wiring board 93 that supplies a drive current to the drive unit 92. The drive unit 92 is attached to the front side (upper side in the figure) of the base 91, and the wiring board 93 is attached to the back side (see FIG. 2) of the base 91. Furthermore, screw holes 91a are provided on both longitudinal sides of the base 91, respectively, through which second fixing screws S2 (see FIGS. 2 and 3) are inserted. The actuator 90 is provided on the back side (see FIG. 2) of the base member 20, and is fixed near the arc-shaped through-hole 25e (see FIG. 4) of the base member 20.

[0065] The drive unit 92 is a drive source that rotates the first and second blades 60, 80 and the link member 50. The drive unit 92 includes a metal (ferromagnetic) yoke 94 formed in a generally U-shape. The yoke 94 has a first arm 94a and a second arm 94b, and a coil bobbin 95 made of a resin material (non-magnetic material) such as plastic is fixed to the first arm 94a. A coil (copper wire) 96 is wound around the coil bobbin 95 with a predetermined number of turns. A pair of first and second terminals T1 and T2 (see FIG. 2) made of a conductor such as brass is provided at one end of the coil 96. The first and second terminals T1 and T2 are electrically connected to a wiring board 93.

[0066] The wiring board 93 is a so-called flexible board and is flexible. A controller CU (see FIGS. 1 and 2) is electrically connected to the end of the wiring board 93 on the side opposite to the first and second terminals T1 and T2 (the lower side in FIG. 2). The controller CU turns on and off the supply of drive current to the coil 96 and switches the direction of the drive current between forward and reverse.

[0067] Specifically, by switching the direction of the drive current flowing through the coil 96 between the forward and reverse directions, the first arm 94a, which is a ferromagnetic material, is magnetized to a north pole or a south pole. On the other hand, the second arm 94b, which is a ferromagnetic material, becomes a south pole when the first arm 94a is magnetized to a north pole, and becomes a north pole when the first arm 94a is magnetized to a south pole. As a result, the operating member 97, which forms the movable part of the drive unit 92, rotates in the forward and reverse directions according to the switching of the polarity of the first and second arms 94a, 94b.

[0068] An operating member 97 of the drive unit 92 is rotatably supported on a rotation shaft 91b provided on the base 91. When the drive unit 92 is attached to the base 91, the operating member 97 is disposed between the first arm 94a and the second arm 94b.

[0069] The operating member 97 is made of a resin material such as plastic and includes an annular main body 97a formed in an annular shape. An output portion 97b is integrally provided on the outer periphery of the annular main body 97a, the tip of which extends along the axis Ct and is inserted into an arc-shaped through-hole 25e (see FIG. 4) of the base member 20. The output portion 97b inserted into the arc-shaped through-hole 25e is connected to both the arc-shaped hole 51a of the link member 50 (see FIG. 5) and the first elongated operating hole 63b of the first blade 60 (see FIG. 6).

[0070] A rotor magnet 98 formed in a generally cylindrical shape is fixed to the annular main body 97a so as to be coaxial with the annular main body 97a. In other words, the rotor magnet 98 is rotatable between the first arm portion 94a and the second arm portion 94b. The rotor magnet 98 is a so-called plastic magnet, which can be molded with high precision and is not brittle, eliminating the risk of chipping.

[0071] Here, the rotor magnet 98 is magnetized with north and south poles at 180-degree intervals in the circumferential direction thereof, so that the operating member 97 is attracted to or repelled by the first and second arms 94a and 94b, respectively, in accordance with the switching of the polarities of the first and second arms 94a and 94b, and is rotated around the axis Ct.

[0072] When the coil 96 is de-energized, the first and second arms 94a, 94b become non-polar metal (ferromagnetic material). For example, when a drive current is supplied to the coil 96 to make the first arm 94a a north pole, the south pole of the rotor magnet 98 is attracted to the first arm 94a. When the coil 96 is then de-energized, the magnetic force (in this case, the south pole) of the rotor magnet 98 maintains the state in which the non-polar ferromagnetic first arm 94a is attracted (de-energization maintaining function). As a result, it is only necessary to temporarily pass a drive current through the coil 96, thereby reducing power consumption.

[0073] <Opening operation> The opening operation (OPEN) of the first and second blades 60, 80 will be described below with reference to FIGS.

[0074] 7, when the actuator 90 is driven to rotate the operating member 97 in the direction of arrow CW (clockwise direction) around the axis Ct, the output portion 97b moves from one side to the other inside the arc-shaped through-hole 25e (see FIG. 4). Specifically, the output portion 97b moves from the radially outer side of the base member 20 to the radially inner side inside the arc-shaped through-hole 25e.

[0075] 8, the link member 50 is rotated around the link shaft 25d (first axis C1) in the direction of arrow R1 (counterclockwise) inside the link member accommodating portion 25. As a result, the opening-side abutment surface SF1 of the link member 50 abuts against the opening-side stopper portion 26a as shown by arrow STP1. Therefore, further rotation of the link member 50 is restricted, and the rotation of the link member 50 is stopped.

[0076] At this time, as the output portion 97b is driven, the first blade 60 rotates in the direction of arrow R2 (clockwise) around the first blade shaft 28a (second axis C2). This causes the first blade 60 to perform an opening operation, opening approximately half of one radial side of the opening 21a. Unlike the second blade 80, the first blade 60 is not rotated by the link member 50 but is rotated directly by the output portion 97b.

[0077] Furthermore, since the rotation of the link member 50 is restricted by the open side stopper portion 26a, the first blade body 61 of the first blade 60 does not collide with the side wall portion 22 of the base member 20, and a small gap G1 is formed between the first blade 60 and the side wall portion 22.

[0078] Meanwhile, as the operating protrusion 54 forming the link member 50 rotates in the direction of the arrow R3 (counterclockwise), the second blade 80 rotates around the second blade shaft 29a (third axis C3) in the direction of the arrow R4 (clockwise). This causes the second blade 80 to perform an opening operation, opening approximately half of the other radial side of the opening 21a. Unlike the first blade 60, the second blade 80 is not rotated directly by the output portion 97b, but is rotated by the link member 50.

[0079] Furthermore, since the rotation of the link member 50 is restricted by the open side stopper portion 26a, the second blade body 81 of the second blade 80 does not collide with the side wall portion 22 of the base member 20, and a small gap G2 is formed between the second blade 80 and the side wall portion 22.

[0080] Thereafter, the supply of the drive current to the coil 96 is stopped, and the magnetic force of the rotor magnet 98 maintains the first and second blades 60, 80 in the open state.

[0081] Here, second blade 80 is rotated by actuator 90 via link member 50, so actuator 90 also needs a driving force (driving torque) to rotate link member 50. Therefore, in this embodiment, the so-called "leverage principle" is used to rotate link member 50 and second blade 80 with the minimum necessary driving force.

[0082] 8, the position of the first elongated operating hole 63b to which the output portion 97b is connected is the "point of force," the position of the link shaft 25d is the "fulcrum," and the position of the second elongated operating hole 83b to which the operating protrusion 54 is connected is the "point of action." A first distance L1 from the link shaft 25d to the output portion 97b is longer than a second distance L2 from the link shaft 25d to the second elongated operating hole 83b (L1>L2).

[0083] In this way, output section 97b of actuator 90 directly rotates first blade 60, while utilizing the "principle of leverage" to rotate link member 50 and second blade 80 with the minimum necessary driving force. Therefore, there is no need to increase the output of actuator 90, and power consumption is reduced.

[0084] On the other hand, when a large external force (such as an impact) is applied to the blade drive device 10 from the radial direction while the opening 21a is in the open state shown in FIG. 8, the first and second blades 60, 80 attempt to rotate in a direction to close the opening 21a. In this case, in addition to the holding force (first holding force) when no current is applied by the actuator 90, the moment of inertia of the link member 50 present between the first blade 60 and the second blade 80 acts as a rotation resistance (second holding force) for the first and second blades 60, 80, and this second holding force is added to the first holding force. Therefore, the first and second blades 60, 80 are difficult to close (difficult to rotate) due to an external force such as an impact. In other words, the blade drive device 10 has sufficient impact resistance.

[0085] As shown in FIG. 8, the first blade shaft 28a and the second blade shaft 29a are disposed facing each other around the opening 21a of the base member 20. That is, the first blade 60 and the second blade 80 are disposed at 180-degree intervals from each other in the circumferential direction of the opening 21a. As a result, when the first blade 60 attempts to close, the second blade 80 attempts to rotate in the direction opposite to the first blade 60, and when the second blade 80 attempts to close, the first blade 60 attempts to rotate in the direction opposite to the second blade 80. In this way, the first blade 60 and the second blade 80 operate to cancel each other's moments. This also ensures sufficient impact resistance of the blade drive device 10.

[0086] <Closing operation> The closing operation (CLOSE) of the first and second blades 60, 80 will be described below with reference to FIGS.

[0087] 7, when the actuator 90 is driven to rotate the operating member 97 in the CCW direction (counterclockwise direction) around the axis Ct, the output portion 97b moves inside the arc-shaped through-hole 25e (see FIG. 4) in one direction from the other side. Specifically, the output portion 97b moves inside the arc-shaped through-hole 25e from the radially inner side of the base member 20 to the radially outer side.

[0088] 9, the link member 50 is rotated around the link shaft 25d (first axis C1) in the direction of arrow R5 (clockwise direction) inside the link member accommodating portion 25. As a result, the closing-side abutment surface SF2 of the link member 50 abuts against the closing-side stopper portion 27a as shown by the arrow STP2. Therefore, further rotation of the link member 50 is restricted, and the rotation of the link member 50 is stopped.

[0089] At this time, the first blade 60 rotates in the direction of arrow R6 (counterclockwise) around the first blade shaft 28a (second axis C2) as the output portion 97b is driven, thereby causing the first blade 60 to perform a closing operation, and approximately half of one radial side of the opening 21a is closed.

[0090] Meanwhile, as the operating protrusion 54 forming the link member 50 rotates in the direction of the arrow R7 (clockwise direction), the second blade 80 rotates around the second blade shaft 29a (third axis C3) in the direction of the arrow R8 (counterclockwise direction), thereby causing the second blade 80 to perform a closing operation, and approximately the other radial half of the opening 21a is closed.

[0091] Thereafter, the supply of the drive current to the coil 96 is stopped, and the magnetic force of the rotor magnet 98 keeps the first and second blades 60, 80 in the closed state.

[0092] Here, as in the opening operation, second blade 80 is rotated by actuator 90 using the minimum necessary driving force based on the "leverage principle." Therefore, as in the opening operation, there is no need to increase the output of actuator 90 in the closing operation, and power consumption is reduced.

[0093] Furthermore, even when a large external force (such as an impact) is applied to the blade drive device 10 from the radial direction while the opening 21a is in the closed state, the rotational resistance (second holding force) of the first and second blades 60, 80 due to the moment of inertia of the link member 50 is added to the holding force (first holding force) when no current is applied, just as when the opening 21a is in the open state. Therefore, the first and second blades 60, 80 are difficult to open (difficult to rotate) due to an external force such as an impact, and sufficient impact resistance is ensured just as when the opening 21a is in the open state.

[0094] Furthermore, just as when opening 21a is in the open state, when first blade 60 tries to open, second blade 80 tries to rotate in the direction opposite to first blade 60, and when second blade 80 tries to open, first blade 60 tries to rotate in the direction opposite to second blade 80. In other words, even when opening 21a is in the closed state, first and second blades 60, 80 operate to cancel each other's moments. Therefore, just as when opening 21a is in the open state, sufficient impact resistance is ensured.

[0095] As described above in detail, the blade drive device 10 of embodiment 1 includes the link member 50 that synchronizes the operation of the first blade 60 and the second blade 80, and the link member 50 has the first link arm 51 to which the first operating elongated hole 63b and the output portion 97b are connected, the second link arm 52 to which the second operating elongated hole 83b is connected, and the first corner portion CN1 that connects the first link arm 51 and the second link arm 52 and is attached to the link shaft 25d, and the base member 20 is provided with the open-side stopper portion 26a and the closed-side stopper portion 27a that regulate the rotation angle of the link member 50.

[0096] As a result, the actuator 90 rotates the first blade 60 and the second blade 80 via the link member 50, and therefore the rotational resistance (second holding force) of the first and second blades 60, 80 due to the moment of inertia of the link member 50 can be added to the holding force (first holding force) when no current is applied by the actuator 90. This makes it possible to increase the holding force that holds the first and second blades 60, 80 in the open / closed state.

[0097] Furthermore, the rotation angle of link member 50 can be restricted by open-side stopper portion 26a and closed-side stopper portion 27a, which in turn restricts the rotation angles of first blade 60 and second blade 80. This makes it possible to prevent first and second blades 60, 80 from colliding with side wall portion 22, thereby improving the durability of first and second blades 60, 80.

[0098] Furthermore, according to the blade drive device 10 of embodiment 1, the first blade shaft 28a and the second blade shaft 29a are arranged opposite each other with the opening 21a at the center, so that the first blade 60 and the second blade 80 can be operated so as to cancel each other's moments.

[0099] This also increases the force with which the first and second blades 60, 80 are held in the open and closed states, thereby ensuring sufficient impact resistance of the blade drive device 10.

[0100] Furthermore, according to the blade drive device 10 of embodiment 1, the base member 20 has a bottom wall portion 21 and a side wall portion 22, and the side wall portion 22 covers the first blade 60 and the second blade 80 when the base member 20 is viewed from a direction perpendicular to its axial direction, and when the rotation of the link member 50 is restricted by the open-side and closed-side stopper portions 26a and 27a, minute gaps G1 and G2 are provided between the first blade 60 and the side wall portion 22 and between the second blade 80 and the side wall portion 22, respectively.

[0101] This makes it possible to prevent the first and second blades 60, 80 from being damaged, and ultimately makes it possible to improve the durability of the blade drive device 10.

[0102] Furthermore, according to the blade drive device 10 of the first embodiment, the first distance L1 from the link shaft 25d to the output portion 97b is longer than the second distance L2 from the link shaft 25d to the second operation elongated hole 83b.

[0103] This makes it possible to open and close second blade 80 with a small driving force by utilizing the "principle of leverage." Therefore, the power consumption of actuator 90 can be reduced.

[0104] Furthermore, according to the blade drive device 10 of embodiment 1, the link member 50 is provided with a first corner portion CN1 that protrudes radially outward from the opening 21a, and the first corner portion CN1 is rotatably supported by the link shaft 25d.

[0105] This allows the link member 50 to be formed in a generally arcuate shape extending circumferentially around the opening 21a, which in turn prevents the base member 20 from becoming larger in diameter (size), and prevents the blade drive device 10 from becoming larger.

[0106] <Embodiment 2> FIG. 10 is a perspective view showing the base member of the second embodiment alone, FIG. 11 is a perspective view showing the link member of the second embodiment alone, FIG. 12 is a diagram explaining the opening operation of the blade drive device of the second embodiment, and FIG. 13 is a diagram explaining the closing operation of the blade drive device of the second embodiment.

[0107] The same reference numerals are used to designate parts having the same functions as those in the first embodiment, and detailed descriptions thereof will be omitted.

[0108] As shown in Figures 10 to 13, the blade drive device 100 of embodiment 2 is different from the blade drive device 10 of embodiment 1 described above (see Figures 8 and 9) in the shape of the base member 110 and the shape of the link member 120.

[0109] <Base material> 10, in the base member 110 of the second embodiment, an arc-shaped through hole 111 is provided at the connection portion between the first linear recess 25a and the second linear recess 25b that form the link member accommodating portion 25. Accordingly, the position at which the actuator 90 (see FIG. 7) is fixed to the base member 110 is also changed to match the position of the arc-shaped through hole 111.

[0110] <Link material> As shown in Figure 11, in the link member 120 of embodiment 2, a link corner portion (output portion connecting protrusion) CN that protrudes radially outward from the opening 21a is provided on the first link arm 51 in accordance with the position of the arc-shaped through hole 111 (see Figure 10) of the base member 110, and an arc hole 121 to which the output portion 97b (see Figures 12 and 13) is connected is provided on the link corner portion CN.

[0111] An operating protrusion 122 is provided on one longitudinal side (tip side) of the first link arm 51. Similar to the operating protrusion 54 of the second link arm 52, the operating protrusion 122 is formed in a cylindrical shape and extends toward the first blade 60 (upward in FIG. 10). The operating protrusion 122 is connected to the first operating elongated hole 63b of the first blade operating part 62 (see FIGS. 12 and 13).

[0112] Thus, in link member 120 of embodiment 2, output portion 97b is disposed between first operation elongated hole 63b and link shaft 25d in the longitudinal direction of first link arm 51. In embodiment 2, output portion 97b rotates only link member 120, and first blade 60 and second blade 80 are both rotated by link member 120.

[0113] <Opening operation> The opening operation (OPEN) of the blade drive device 100 will be described below with reference to FIG.

[0114] When the actuator 90 (see FIG. 7) is driven in the CW direction, the output portion 97b moves inside the arc-shaped through-hole 111 from the radially outer side to the radially inner side of the base member 20. This causes the link member 120 to rotate in the direction of arrow R11 (counterclockwise) around the link shaft 25d (first axis C1). As a result, the opening-side abutment surface SF1 of the link member 120 abuts against the opening-side stopper portion 26a, stopping the rotation of the link member 120.

[0115] At this time, the operating protrusion 122 rotates in the direction of arrow R12 (counterclockwise) in accordance with the rotation of the link member 120. As a result, the first blade 60 rotates in the direction of arrow R13 (clockwise), and approximately half of one radial side of the opening 21a is opened.

[0116] Meanwhile, second blade 80 rotates in the direction of arrow R15 (clockwise direction) as operation protrusion 54 rotates in the direction of arrow R14 (counterclockwise direction), thereby opening second blade 80 and opening approximately half of opening 21a on the other radial side.

[0117] In the second embodiment, the first blade 60 is also rotated by the link member 120 in the same manner as the second blade 80 .

[0118] Thereafter, the supply of the drive current to the coil 96 (see FIG. 7) is stopped, and the magnetic force of the rotor magnet 98 maintains the first and second blades 60, 80 in the open state.

[0119] In the second embodiment, the first distance L3 from the link shaft 25d to the output portion 97b is approximately the same as the second distance L4 from the link shaft 25d to the second operation elongated hole 83b (L3≈L4). Therefore, compared to the blade drive device 10 of the first embodiment, the actuator 90 needs to be driven with a larger drive torque. Furthermore, the holding force of the first and second blades 60, 80 against external forces such as impacts is larger than that of the blade drive device 10 of the first embodiment because a larger drive torque is required as described above.

[0120] <Closing operation> The closing operation (CLOSE) of the blade drive device 100 will be described below with reference to FIG.

[0121] When the actuator 90 (see FIG. 7) is driven in the CCW direction, the output portion 97b moves inside the arc-shaped through-hole 111 from the radially inner side of the base member 20 to the radially outer side. This causes the link member 120 to rotate in the direction of arrow R16 (clockwise direction) around the link shaft 25d (first axis C1). As a result, the closing-side abutment surface SF2 of the link member 120 abuts against the closing-side stopper portion 27a, stopping the rotation of the link member 120.

[0122] At this time, the operating protrusion 122 rotates in the direction of arrow R17 (clockwise direction) in accordance with the rotation of the link member 120. As a result, the first blade 60 rotates in the direction of arrow R18 (counterclockwise direction), and approximately one half of the radial side of the opening 21a is closed.

[0123] Meanwhile, second blade 80 rotates in the direction of arrow R20 (counterclockwise) as operation protrusion 54 rotates in the direction of arrow R19 (clockwise), thereby performing a closing operation on second blade 80, and approximately the other radial half of opening 21a is closed.

[0124] Thereafter, the supply of the drive current to the coil 96 (see FIG. 7) is stopped, and the magnetic force of the rotor magnet 98 keeps the first and second blades 60, 80 closed.

[0125] The blade drive device 100 of the second embodiment configured as described above can also achieve the same effects as those of the first embodiment. In addition, in the blade drive device 100 of the second embodiment, the link member 120 rotates both the first blade 60 and the second blade 80. Therefore, the output portion 97b of the actuator 90 can be disposed in another portion of the link member 120, that is, between the first operation elongated hole 63b and the link shaft 25d, and the output portion 97b can be configured to rotate only the link member 120. Specifically, the length of the output portion 97b can be made shorter than that of the output portion 97b of the first embodiment. Therefore, even if a large load is applied to the output portion 97b, tilting or damage to the output portion 97b can be effectively prevented.

[0126] In each of the above-described embodiments, the first linear recess 25a of the base member 20 is provided with the open-side and closed-side stopper portions 26a and 27a as stopper portions, but this is not limited to the present disclosure, and stopper portions can also be provided in the second linear recess 25b or the third linear recess 25c of the base member 20.

[0127] Furthermore, in each of the above-described embodiments, the blade drive device 10, 100 is shown as being for an infrared camera used in a surveillance camera, but this is not limited to the present disclosure, and the device can also be used for cameras that are susceptible to external forces such as vibrations, such as an in-vehicle camera mounted on a vehicle such as an automobile, or an aerial camera mounted on a drone.

[0128] Furthermore, the present technology can be configured as follows.

[0129] (1) A blade drive device comprising: a base member having an opening; a first blade and a second blade rotatably attached to a first blade shaft and a second blade shaft provided on the base member, respectively, and opening and closing the opening; a link member rotatably attached to a link shaft provided on the base member, and causing the first blade and the second blade to move synchronously; and an actuator provided on the base member and having an output part for rotating the link member, wherein the link member comprises: a first link arm provided on one longitudinal side of the link member, and to which a first blade connecting part provided on the first blade and the output part are connected; a second link arm provided on the other longitudinal side of the link member, and to which a second blade connecting part provided on the second blade is connected; and a link shaft mounting part connecting the first link arm and the second link arm and mounted on the link shaft, wherein the base member is provided with a stopper part for restricting the rotation angle of the link member.

[0130] (2) The blade drive device according to (1), wherein the first blade shaft and the second blade shaft are arranged opposite each other with the opening at the center.

[0131] (3) The blade drive device described in (1) or (2), wherein the base member has a bottom wall portion and a side wall portion, and the side wall portion covers the first blade and the second blade when the base member is viewed from a direction perpendicular to its axial direction, and when the rotation of the link member is restricted by the stopper portion, a gap is provided between the first blade and the side wall portion and between the second blade and the side wall portion.

[0132] (4) The blade drive device according to any one of (1) to (3), wherein a first distance from the link shaft to the output portion is longer than a second distance from the link shaft to the second blade connecting portion.

[0133] (5) A blade drive device according to any one of (1) to (4), wherein the link member has a protrusion that protrudes radially outward from the opening, and the protrusion is the link shaft mounting portion.

[0134] (6) The blade drive device according to any one of (1) to (5), wherein the output portion is disposed between the first blade connecting portion and the link shaft in the longitudinal direction of the first link arm.

[0135] (7) The blade drive device according to (6), wherein the first link arm is provided with an output portion coupling protrusion that protrudes radially outward from the opening and to which the output portion is coupled. [Explanation of symbols]

[0136] 10... blade drive device, 11... housing, 20... base member, 21... bottom wall portion, 21a... opening, 22... side wall portion, 23... accommodation chamber, 24... base opening, 25... link member accommodation portion, 25a... first linear recess, 25b... second linear recess, 25c... third linear recess, 25d... link shaft, 25e... arc-shaped through hole, 26... first opposing wall, 26a... opening side stopper portion (stopper portion), 27... second opposing wall, 27a... closing side stopper portion (stopper portion), 28... first blade accommodation portion, 2 8a...first blade shaft, 29...second blade housing section, 29a...second blade shaft, 40...cover member, 41...cover opening, 50...link member, 51...first link arm, 51a...arc hole, 52...second link arm, 53...link mounting hole, 54...operation protrusion, 60...first blade, 61...first blade main body, 62...first blade operating section, 63...first reinforcing section, 63a...first blade mounting hole, 63b...first operation elongated hole (first blade connecting section), 70...partition plate, 80...second blade, 81...second blade main body, 82...second Blade operating portion, 83...second reinforcing portion, 83a...second blade mounting hole, 83b...second operating elongated hole (second blade connecting portion), 90...actuator, 91...base, 91a...screw hole, 91b...rotating shaft, 92...drive unit, 93...wiring board, 94...yoke, 94a...first arm portion, 94b...second arm portion, 95...coil bobbin, 96...coil, 97...operating member, 97a...annular main body, 97b...output portion, 98...rotor magnet, 100...blade driving device, 110...base member, 111...circle Arc-shaped through hole, 120...link member, 121...circular hole, 122...operating protrusion, CN...link corner (output portion connecting protrusion), CN1...first corner (protrusion, link shaft mounting portion), CN2...second corner, CU...controller, G1...minor gap (gap), G2...minor gap (gap), L1, L3...first distance, L2, L4...second distance, LH1, LH2...long hole, S1...first fixing screw, S2...second fixing screw, SF1...opening side abutment surface, SF2...closing side abutment surface, T1...first terminal, T2...second terminal

Claims

1. a base member having an opening; a first blade and a second blade rotatably attached to a first blade shaft and a second blade shaft, respectively, provided on the base member, and configured to open and close the opening; a link member rotatably attached to a link shaft provided on the base member, the link member causing the first blade and the second blade to operate synchronously; an actuator provided on the base member and having an output portion that rotates the link member; and The link member is a first link arm provided on one longitudinal side of the link member, the first link arm being connected to a first blade connecting portion provided on the first blade and the output portion; a second link arm provided on the other longitudinal side of the link member, to which a second blade connecting portion provided on the second blade is connected; a link shaft mounting portion that connects the first link arm and the second link arm and is mounted on the link shaft; Equipped with The base member is provided with a stopper portion that restricts the rotation angle of the link member. Blade drive device.

2. The blade drive device according to claim 1, the first blade shaft and the second blade shaft are arranged opposite to each other with the opening at the center; Blade drive device.

3. The blade drive device according to claim 1, the base member has a bottom wall and a side wall; the side wall portion covers the first blade and the second blade when the base member is viewed from a direction perpendicular to the axial direction of the base member, When the rotation of the link member is restricted by the stopper portion, a gap is provided between the first blade and the side wall portion and between the second blade and the side wall portion. Blade drive device.

4. The blade drive device according to claim 1, a first distance from the link shaft to the output portion is longer than a second distance from the link shaft to the second blade connecting portion; Blade drive device.

5. The blade drive device according to claim 1, The link member is provided with a protrusion that protrudes radially outward from the opening, and the protrusion is the link shaft mounting portion. Blade drive device.

6. The blade drive device according to claim 1, the output portion is disposed between the first blade connecting portion and the link shaft in the longitudinal direction of the first link arm. Blade drive device.

7. The blade drive device according to claim 6, The first link arm is provided with an output portion coupling protrusion that protrudes radially outward from the opening and to which the output portion is coupled. Blade drive device.

Images