JP2013113996A - Rotating plate drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating plate drive device capable of adjusting the position of a rotating plate when the rotating plate is stopped due to a failure even when intrusion of foreign matter is prevented.SOLUTION: In a rotating plate drive device 1, an opening 125b is provided at a position facing a distal end face 961 of a first rotation axis 96 of a housing 120 and the opening 125b is sealed by a sealing member 124. An engaged section 962 formed of a minus shaped groove (recess) is formed on the distal end face 961 of the first rotation axis 96. Accordingly, if the sealing member 124 is removed or destroyed and a tool such as a minus driver is inserted from the opening 125b to be engaged to the engaged section 962 when a first shutter plate 20 is stopped at an improper position due to the occurrence of a failure in a first motor 90, etc, the first rotation axis 96 can be rotated and the first shutter plate 20 can be moved to a proper position.

Description

  The present invention relates to a rotary plate drive device in which a housing is provided around a rotary shaft and a rotary drive mechanism.

  As a rotating plate driving device for driving the rotating plate, for example, a device for rotating a rotating plate made of a shutter plate provided with a light transmitting portion by a driving source such as a motor has been proposed. In this way, a moving image can be taken as a continuous still image like time-lapse photography. Further, since two rotating plates (shutter plates) are provided, exposure time can be adjusted (see Patent Document 1).

  Patent Document 1 describes a configuration in which a rotating shaft or the like that transmits the rotation of a motor to a rotating plate is exposed.

JP 2011-33178 A

  However, when the rotating shaft or the like is exposed as in the configuration described in Patent Document 1, there is a problem in that foreign matters such as dust enter the movable portion and problems are likely to occur. On the other hand, if the rotating shaft etc. are completely covered by the housing, if the drive source breaks down while the rotating plate drive device is in use, or if the rotating plate stops at an improper position, shooting will not be possible at all, causing serious damage. May occur.

  In view of the above problems, an object of the present invention is to provide a rotating plate driving device capable of adjusting the position of the rotating plate when the rotating plate stops due to a problem even when foreign matter is prevented from entering. There is.

  In order to solve the above problems, the present invention provides a first rotating plate, a first driving source for driving the first rotating plate, and the rotation of the first driving source transmitted to the first rotating plate. A rotary plate drive device having a first rotary shaft and a housing that covers the first rotary shaft and the first drive source, the rotary plate drive device being provided at a position facing the end surface of the first rotary shaft in the housing. And a sealing member that seals the opening, and an engaged portion that includes a convex portion or a concave portion formed on the end surface of the first rotating shaft.

  In the present invention, the housing covers the first rotary shaft and the first drive source, and foreign matter such as dust is less likely to enter the space in which the first rotary shaft and the first drive source are arranged. Moreover, although the opening part is provided in the position which opposes the end surface of a 1st rotating shaft in a housing, since an opening part is sealed with the sealing member, even when providing an opening part, a 1st rotating shaft is provided. In addition, foreign matters such as dust are less likely to enter the space where the first drive source is disposed. Here, since the engaged part which consists of a convex part or a recessed part is formed in the end surface of the 1st rotating shaft, a malfunction occurred in a drive source etc. and the 1st rotating plate stopped at an improper position. In this case, if the sealing member is removed or destroyed and a tool such as a screwdriver is inserted through the opening and engaged with the engaged portion, the first rotating shaft can be rotated by an external force. Therefore, the first rotating plate can be moved to an appropriate position.

  In the present invention, it is preferable that the engaged portion is a negative groove or a positive groove. According to such a configuration, the first rotation shaft can be rotated by a minus driver or a plus driver.

  In the present invention, the sealing member is preferably in the form of a sheet. According to this configuration, the sheet-like sealing member can be pierced with a tool such as a screwdriver without removing the sealing member, and the first rotation shaft can be rotated.

  In the present invention, it is preferable that the first rotating plate is a first shutter plate having a first light transmitting portion. According to such a configuration, when a failure occurs in the drive source or the like and the first rotating plate (first shutter plate) stops at an inappropriate position, the first rotating shaft is rotated by using the tool to rotate the first rotating shaft. The 1st translucent part of a rotating plate can be moved to an appropriate position.

  In the present invention, the second rotating plate that rotates around the same axis as the first rotating plate, the second driving source for driving the second rotating plate, and the rotation of the second driving source are A second rotating shaft that transmits to the second rotating plate, and the second rotating plate is a second shutter member that faces the first rotating plate and is located at a position that overlaps the first light transmitting portion. It is preferable that the second rotating plate is driven when the first rotating shaft is rotated by an external force in a state where the second light transmitting portion is provided and the first driving source and the second driving source are stopped. According to this configuration, when a problem occurs in the drive source or the like and the first rotating plate (first shutter plate) and the second rotating plate (second shutter plate) stop at an inappropriate position, a tool is used. By rotating the first rotating shaft, the first light transmitting portion of the first rotating plate and the second light transmitting portion of the second rotating plate can be moved to appropriate positions.

  In the present invention, the housing covers the first rotary shaft and the first drive source, and it is difficult for foreign matters such as dust to enter the space where the rotary shaft and the first drive source are arranged. In addition, the opening is provided in the housing at a position facing the end surface of the first rotation shaft. However, since the opening is sealed by the sealing member, even when the opening is provided, the rotation shaft and the first rotation shaft are provided. It is difficult for foreign matter such as dust to enter the space where one drive source is arranged. Here, since the engaged portion consisting of a convex portion or a concave portion is formed on the end surface of the first rotating shaft, when a malfunction occurs in the drive source or the like and the rotating plate stops at an inappropriate position, If the sealing member is removed or destroyed and a tool such as a screwdriver is inserted from the opening and engaged with the engaged portion, the first rotating plate can be rotated. Therefore, when the rotating plate stops due to a problem, the first rotating plate can be adjusted to the optimum position.

It is explanatory drawing which shows the external appearance etc. of the rotary plate drive device to which this invention is applied. It is a longitudinal cross-sectional view of the rotary plate drive device to which this invention is applied. It is explanatory drawing when the rotary plate drive device to which this invention is applied is seen from the front side of an optical axis direction.

  Embodiments of the present invention will be described with reference to the drawings. In the following explanation, L is given to the rotation center axis of the rotating plate, La is given to one side of the rotation center axis L, and Lb is given to the other side.

[Configuration example of rotating plate driving device (rotary shutter device)]
FIG. 1 is an explanatory view showing the appearance and the like of a rotating plate drive device to which the present invention is applied. FIGS. 1A and 1B are a perspective view of the rotating plate drive device as viewed from the front, and a rotating plate drive. It is the perspective view which looked at the apparatus from back.

(overall structure)
As shown in FIG. 1, the rotary plate driving device 1 includes a first shutter plate 20 (first rotary plate), a second shutter plate 30 (second rotary plate), and a rotary drive mechanism 40 on the rotation center axis L. It has a coaxially arranged structure. In the following description, for the sake of convenience, in the direction of the rotation center axis L, the side on which the first shutter plate 20 is disposed will be referred to as the front side, and the side on which the rotation drive mechanism 40 is disposed will be referred to as the rear side. The first shutter plate 20 and the second shutter plate 30 are discs having a diameter larger than that of the rotation drive mechanism 40. The first shutter plate 20 includes a light transmitting portion and a light shielding portion, and a fan-shaped first light transmitting portion 20a extending in the circumferential direction over a predetermined angle range is provided at a predetermined position in the radial direction L1. Is formed. The second shutter plate 30 also includes a light transmitting portion and a light shielding portion, and has the same shape as the first shutter plate 20. That is, a fan-shaped second light-transmitting portion 30a extending in the circumferential direction over a predetermined angle range is formed at a predetermined position in the radial direction L1 of the second shutter plate 30. The first shutter plate 20 and the second shutter plate 30 face each other at a narrow interval, and in FIG. 1, the phases of the first light transmitting portion 20a and the second light transmitting portion 30a are shifted by 90 degrees. In addition, a fan-shaped shutter opening 50 is formed over a predetermined angular range by the overlapping portion of the first light transmitting portion 20a and the second light transmitting portion 30a. The shutter opening 50 is located on the outer peripheral side of the outer peripheral surface of the rotation drive mechanism 40.

  When the rotating plate driving device 1 is incorporated in a photographing camera, as shown by an imaginary line (two-dot chain line) in FIG. 1, a photographing lens 60 is disposed in front of the first shutter plate 20, and the second shutter plate. An imaging unit 70 such as a CCD is disposed behind 30. When the first shutter plate 20 and the second shutter plate 30 are rotationally driven by the rotational drive mechanism 40, the shutter opening 50 passes between the photographing lens 60 and the imaging unit 70. The rotation drive mechanism 40 is driven and controlled by, for example, a drive control unit 80 of the photographing camera.

  Next, the operation of the rotating plate driving device 1 will be described. In the rotary plate driving device 1 of the present embodiment, in the initial state, the opening angle of the shutter opening 50 is set to 90 degrees, for example. When operating the rotary plate driving device 1, the drive control unit 80 rotates the first shutter plate 20 and the second shutter plate 30 integrally at the same speed. At that time, when the shutter speed is increased, the rotation speeds of the first shutter plate 20 and the second shutter plate 30 are set to 5000 to 10,000 rotations / second, and when the shutter speed is decreased, the first shutter plate. The rotation speed of the 20 and the second shutter plate 30 is set to 200 to 500 rotations / second.

  Next, when changing the exposure time, the drive control unit 80 changes the phases of the first light transmitting part 20a of the first shutter plate 20 and the second light transmitting part 30a of the second shutter plate 30 to change the shutter. The opening angle of the opening 50 is changed. More specifically, the drive control unit 80 rotationally drives the first motor 90 and the second motor 10 at different rotational speeds, and sets the opening angle of the shutter opening 50 to a predetermined condition. In this way, after the opening angle of the shutter opening 50 is set to a desired angle, the drive control unit 80 again unites the first shutter plate 20 and the second shutter plate 30 at a predetermined rotational speed. Rotate. Therefore, the moving image can be photographed as a continuous still image like a time-lapse photography and the exposure time can be adjusted by a method of photographing a moving image as usual.

(Internal structure of rotating plate drive device (rotary shutter device))
FIG. 2 is a longitudinal sectional view of the rotary plate driving device 1 to which the present invention is applied. As shown in FIG. 2, in the rotary plate driving device 1 of the present embodiment, the rotary drive mechanism 40 includes a first rotary shaft 96, a first motor 90 (first drive source), a second rotary shaft 100, and a second motor 10. (Second drive source), the wave gear mechanism 110, and a housing 120 that covers the entire periphery of the wave gear mechanism 110 are provided. The housing 120 includes a plurality of housing members 125, 126, 127, 128, and 129. The first motor 90 and the first rotating shaft 96 are disposed inside the housing member 125, and the wave gear mechanism 110, the second motor 10, and the second rotating shaft 100 are disposed inside the housing members 128 and 129. ing. The first rotating shaft 96, the second rotating shaft 100, the wave gear mechanism 110, the first motor 90, and the second motor 10 are coaxially arranged on the rotation center axis L.

  In the rotary plate driving device 1, the first motor 90 includes a rotor 91 having a magnet 93 fixed to a first rotating shaft 96 via a cylindrical connecting member 95. A back yoke 97 is provided behind (front side). In addition, two stator substrates 94 each including a stator coil 94a are arranged in a stacked manner at a position facing the magnet 93 on the rear side. In the stator substrate 94, the stator coil 94a is covered with an insulating film (not shown), and no short circuit occurs even if the stator substrates 94 are stacked. In the first motor 90, the outer peripheral side end portion of the stator substrate 94 is sandwiched between housing members 125 and 126 adjacent in the direction of the rotation center axis L. In the present embodiment, the first annular hub 180 is fixed to the first rotating shaft 96, and the first shutter plate 20 is connected to the first annular hub 180.

  The second motor 10 includes a rotor 101 in which a magnet 102 is fixed to a second rotating shaft 100 via a cylindrical connecting member 106. In the rotor 101, a back (rear side) behind the magnet 102 is a back. A yoke 104 is provided. In addition, two stator substrates 103 each provided with a stator coil 103a are disposed so as to overlap each other at a position facing the magnet 102 on the front side. In the stator substrate 103, the stator coil 103a is covered with an insulating film (not shown), and even if the stator substrates 103 are arranged to overlap, a short circuit does not occur. In the second motor 10, the outer peripheral side end portion of the stator substrate 103 is sandwiched between housing members 128 and 129 that are adjacent in the rotation center axis L direction.

  The wave gear mechanism 110 is a flexure-meshing type wave gear mechanism, and includes a cylindrical circular spline 111, a cup-shaped flex spline 112 disposed inside the circular spline 111, and a flexing engagement position by bending the flex spline 112. And a wave generator 113 that moves the sensor in the circumferential direction.

  The wave generator 113 is connected to the second rotating shaft 100 of the second motor 10. The circular spline 111 is centered on the rotational center axis L by two bearings 150 and 160 provided at positions spaced in the direction of the rotational center axis L between the outer peripheral surface of the circular spline 111 and the inner peripheral surface of the housing member 128. Is supported rotatably. The inner rings of the bearings 150 and 160 are sandwiched between a step formed on the outer peripheral surface of the circular spline 111 and a pressing plate 116 fixed to the rear end surface of the circular spline 111 with the sleeve 157 interposed therebetween. Is retained. On the other hand, the outer rings of the bearings 150 and 160 are held between a step formed on the inner peripheral surface of the housing member 128 and a ring 123 screwed to the housing member 128. Further, the central portion of the diaphragm portion 112 c of the flex spline 112 is rotatably supported by the second rotating shaft 100 via the bearing bearing 170, and the circular spline 111 also rotates to the second rotating shaft 100 via the bearing bearing 170. Supported as possible.

  A second annular hub 200 is connected to the circular spline 111, and a second shutter plate 30 is connected to the second annular hub 200. For this reason, the first shutter plate 20 is directly driven by the first motor 90, while the second shutter plate 30 is driven by the second motor 10 via the wave gear mechanism 110.

  In this embodiment, a concave portion 111e is formed at the front end portion of the circular spline 111, while the rear end portion 960 of the first rotating shaft 96 is fitted into the concave portion 111e of the circular spline 111 and is rotatably supported. . In this way, the coaxiality between the first rotating shaft 96 and the second rotating shaft 100 is ensured.

  In the first motor 90, when the auxiliary yoke 11 b is provided on the rotor 91, the auxiliary yoke 11 b is provided using the first annular hub 180 as the auxiliary yoke mounting member 9. In other words, the first annular hub 180 is provided in a portion that expands from the cylindrical portion 9a in which the first rotation shaft 96 is fitted and faces the stator substrate 94 on the rear side. More specifically, the auxiliary yoke mounting member 9 (first annular hub 180) has an annular large diameter that expands at the cylindrical portion 9a into which the first rotating shaft 96 is fitted and the rear end portion of the cylindrical portion 9a. In this auxiliary yoke mounting member 9, an auxiliary yoke 11b made of an annular magnetic plate is attached to the front surface of the large diameter portion 9c via a spacer 11c. It is fixed by. As described above, the auxiliary yoke 11 b is provided in the rotor 91 and rotates integrally with the rotor 91. For this reason, the magnetic attractive force acting between the magnet 93 and the auxiliary yoke 11 b does not act on the first rotating shaft 96 as a thrust force. Further, since the magnet 93 and the auxiliary yoke 11b rotate integrally, no eddy current is generated in the auxiliary yoke 11b, so that a brake caused by the eddy current is not applied to the rotor 91.

  Further, in providing the auxiliary yoke 11e to the rotor 101 in the second motor 10, the auxiliary yoke mounting member 7 including the cylindrical portion 7a into which the second rotating shaft 100 is fitted is used, and the auxiliary yoke 11e is expanded from the cylindrical portion 7a. The diameter is provided at a portion facing the stator substrate 103 on the front side. More specifically, the auxiliary yoke attaching member 7 includes a cylindrical portion 7a into which the second rotating shaft 100 is fitted, and an annular large-diameter portion 7c that expands at the front end portion of the cylindrical portion 7a. The auxiliary yoke 11e is constituted by the large diameter portion 7c. Thus, the auxiliary yoke 11e is provided on the rotor 101 and rotates integrally with the rotor 101. For this reason, the magnetic attractive force acting between the magnet 102 and the auxiliary yoke 11e does not act on the second rotating shaft 100 as a thrust force. Further, since the magnet 102 and the auxiliary yoke 11e rotate integrally, no eddy current is generated in the auxiliary yoke 11e, so that a brake caused by the eddy current is not applied to the rotor 101.

(Configuration of housing 120)
FIG. 3 is an explanatory diagram when the rotary plate driving device 1 to which the present invention is applied is viewed from the front side in the optical axis direction, and FIGS. 3A and 3B show a state before the sealing member is attached. It is explanatory drawing and explanatory drawing which shows the state after attaching the sealing member.

  As shown in FIG. 2, in the rotary plate driving apparatus 1 of this embodiment, the housing 120 includes the first rotary shaft 96, the first motor 90, the second rotary shaft 100, the second motor 10, and the wave gear mechanism 110 throughout. Covering. In the housing 120, the housing member 125 has the same configuration as the housing member 129, and common parts are used.

  As shown in FIGS. 2 and 3, in this embodiment, the housing member 125 is formed at the cylindrical body 125 s that houses the rotor 91, the first rotating shaft 96, and the like, and at the end of the cylindrical body 125 s. A rectangular flange portion 125t is provided, and a notch 125u for fixing the wiring board 5 is formed on the outer peripheral surface of the cylindrical body portion 125s.

  Here, the housing member 125 has a flat plate portion 125a at a portion facing the tip surface 961 (end surface) of the first rotation shaft 96, and the flat plate portion 125a faces the tip surface 961 of the first rotation shaft 96. An opening 125b is formed in the portion to be performed. The opening 125 b is a circular hole having an inner diameter that is slightly larger than the outer diameter of the distal end surface 961 of the first rotating shaft 96.

  A sealing member 124 is attached to the flat plate portion 125 a of the housing member 125 from the front side (outside), and the opening 125 b is closed by the sealing member 124. In this embodiment, the sealing member 124 has a sheet shape and is attached to the housing member 125 with an adhesive material or the like.

  In addition, an engaged portion 962 including a convex portion or a concave portion is formed on the distal end surface 961 of the first rotating shaft 96. In this embodiment, the engaged portion 962 includes a minus (−)-shaped groove (concave portion).

  With the above-described configuration, the rotary plate driving device 1 is caused by problems such as the first motor 90 and the second motor 10 when the first shutter plate 20 and the second shutter plate 30 are rotating at the same speed, for example. When the first shutter plate 20 and the second shutter plate 30 are stopped at an inappropriate position, a tool such as a flathead screwdriver is inserted through the opening 125b and engaged with the engaged portion 962, so that the first rotating shaft 96 can be rotated. Here, the rear end portion 960 of the first rotating shaft 96 is fitted in the concave portion 111e of the circular spline 111 and is rotatably supported. For this reason, when a tool such as a flathead screwdriver is inserted and engaged with the engaged portion 962 and the first rotating shaft 96 is rotated by an external force, the rear end portion 960 of the first rotating shaft 96 and the concave portion 111e of the circular spline 111 are obtained. The circular spline 111 follows and rotates by the frictional force between the second shutter plate 30 and the second shutter plate 30. Accordingly, the first shutter plate 20 and the second shutter plate 30 can be moved simultaneously. Therefore, when the first motor 90 and the second motor 10 that are being driven are stopped due to a failure or the like, the position of the shutter opening 50 described with reference to FIG. 1 can be moved to the position where the imaging unit 70 is disposed. It can be done. In such a state, since the first shutter plate 20 and the second shutter plate 30 do not rotate, it is difficult to capture a moving image like a time-lapse shooting, but emergency measures such as shooting a normal moving image are possible. It is. Therefore, even if a failure occurs in the first motor 90 and the second motor 10, it is possible to avoid a situation where the image is completely missed.

(Main effects of this form)
As described above, in the rotary plate driving device 1 of this embodiment, the housing 120 covers the entire periphery of the first rotary shaft 96, the rotor 91, the second rotary shaft 101, and the rotor 101, so that dust or the like Can be prevented from entering the inside. In addition, the housing member 125 facing the tip surface 961 of the first rotating shaft 96 in the housing 120 is provided with an opening 125b. Since the opening 125b is sealed by the sealing member 124, the opening Even when 125b is provided, foreign matter such as dust is unlikely to enter the housing 120.

  Here, an engaged portion 962 including a minus (−)-shaped groove (concave portion) is formed on the distal end surface 961 of the first rotating shaft 96. For this reason, when a trouble occurs in the first motor 90 or the like and the first shutter plate 20 stops at an inappropriate position, the sealing member 124 is removed or destroyed, and a tool such as a flat-blade screwdriver is inserted through the opening 125b. By engaging with the engaged portion 962, the first rotating shaft 96 can be rotated by an external force. Therefore, the first shutter plate 20 can be moved to an appropriate position.

  For example, when the first shutter plate 20 and the second shutter plate 30 are rotating at the same speed, the first shutter plate 20 and the second shutter plate 30 are caused by problems such as the first motor 90 and the second motor 10. Is stopped at an inappropriate position, the first rotating shaft 96 can be rotated by inserting a tool such as a flathead screwdriver through the opening 125b and engaging with the engaged portion 962. Here, the rear end portion 960 of the first rotating shaft 96 is fitted in the concave portion 111e of the circular spline 111 and is rotatably supported. For this reason, when the first rotating shaft 96 is rotated by an external force, the circular spline 111 rotates following the frictional force between the rear end portion 960 of the first rotating shaft 96 and the concave portion 111e of the circular spline 111, The second shutter plate 30 rotates. Therefore, the first shutter plate 20 and the second shutter plate 30 can be moved simultaneously. Therefore, even if the first motor 90 and the second motor 10 are stopped, the position of the shutter opening 50 described with reference to FIG. 1 can be moved to the position where the imaging unit 70 is disposed. In such a state, since the first shutter plate 20 and the second shutter plate 30 do not rotate, it is difficult to capture a moving image like a time-lapse shooting, but emergency measures such as shooting a normal moving image are possible. It is. Therefore, even if a failure occurs in the first motor 90 and the second motor 10, it is possible to avoid a situation in which an image is not completely taken.

  In this embodiment, the sealing member 124 is in the form of a sheet. Therefore, even if the sealing member 124 is not removed, the first rotating shaft 96 can be rotated if the sheet-like sealing member 124 is pierced with a flat-blade screwdriver.

(Other embodiments)
In the above embodiment, the engaged portion 962 made of a minus (−) shaped groove (recess) is formed on the tip surface 961 of the first rotating shaft 96, but a plus (+) shaped groove (recessed) is formed. In this case, the first rotating shaft 96 can be rotated by a tool such as a Phillips screwdriver. Further, the shape of the engaged portion 962 may be a convex portion as long as the shape can engage the tool.

  In the above embodiment, the opening portion 125b is provided in the housing 120 at a position facing the front end surface 961 of the first rotation shaft 96, and the engaged portion 962 is formed on the front end surface 961 of the first rotation shaft 96. The housing 120 may also be provided with an opening at a position facing the rear end surface of the second rotation shaft 100, and the engaged portion may be formed on the rear end surface of the second rotation shaft 100. Even in such a configuration, the first shutter plate 20 and the second shutter plate 30 can be moved by an external force.

  In the above embodiment, a seal is attached as the sealing member 124, but an oil seal or the like may be used.

  In the above embodiment, the present invention is applied to the rotating plate driving device 1 in which the first shutter plate 20 is connected to the first rotating shaft 96. However, the rotating plate driving device 1 described in Japanese Patent Application Laid-Open No. 2011-33178 is disclosed. As described above, the wave generator 113 of the flexure meshing wave gear mechanism is driven by the first motor, the circular spline 111 is driven by the second motor, the first shutter plate is connected to the flex spline 112, and the second is connected to the circular spline 111. The present invention may be applied to the rotating plate driving device 1 connected with the shutter plate.

DESCRIPTION OF SYMBOLS 1 Rotating plate drive device 10 2nd motor 90 1st motor 91, 101 Rotor 96 1st rotating shaft 100 2nd rotating shaft 120 Motor housing 124 Sealing member 125-129 Housing member 125b Front end surface (end surface)

Claims (5)

A first rotating plate;
A first drive source for driving the first rotating plate;
A first rotating shaft for transmitting rotation of the first drive source to the first rotating plate;
A housing covering the first rotating shaft and the first drive source;
A rotary plate drive device comprising:
An opening provided at a position facing the end surface of the first rotation shaft in the housing;
A sealing member for sealing the opening;
An engaged portion comprising a convex portion or a concave portion formed on the end surface of the first rotation shaft;
A rotating plate driving device comprising:   The rotary plate driving device according to claim 1, wherein the engaged portion includes a −-shaped groove or a + -shaped groove.   The rotary plate driving device according to claim 1, wherein the sealing member is in a sheet shape.   4. The rotating plate driving device according to claim 1, wherein the first rotating plate is a first shutter plate having a first light transmitting portion. 5. further,
A second rotating plate that rotates about the same axis as the first rotating plate;
A second drive source for driving the second rotating plate;
A second rotating shaft for transmitting rotation of the second drive source to the second rotating plate;
Have
The second rotating plate is a second shutter member facing the first rotating plate, and includes a second light transmitting part at a position overlapping the first light transmitting part,
The second rotating plate is driven when the first rotating shaft is rotated by an external force in a state where the first driving source and the second driving source are stopped. A rotating plate driving device according to claim 1.

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