JP5399691B2 - Opening and closing device and imaging device - Google Patents

Description

  The present invention relates to an opening / closing device and an imaging device, for example, an opening / closing mechanism for a member that protects an imaging optical system of the imaging device.

  In an imaging apparatus such as a compact camera, an imaging apparatus that protects an imaging optical system such as a lens or opens and closes an optical path to an optical element by opening and closing a movable member is known. For example, Patent Document 1 discloses an imaging apparatus including an opening / closing mechanism that moves a lens barrier, which is a movable member, between a protection position and a protection release position of a lens using a motor as a drive source.

  Patent Document 2 also includes an open / close mechanism that moves a lens barrier, which is a movable member, between a lens protection position and a protection release position using a motor as a drive source. An imaging apparatus in which transmission is canceled and the lens barrier can be moved manually is disclosed. Patent Document 3 discloses an imaging apparatus including an opening / closing mechanism that opens and closes a movable blade, which is a movable member, using a shape memory alloy as a drive source.

Japanese Patent Laid-Open No. 9-230431 JP 2004-126044 A JP 2007-127709 A

  Here, in an apparatus provided with such an opening / closing mechanism, it is necessary to prevent the movable member from being arbitrarily moved by the inertia even when vibration or impact is applied. For example, when the lens barrier is located at the protection position, if the lens barrier is moved to the protection release position by vibration or impact, the imaging optical system cannot be protected. In order to hold the movable member at a specific position even when vibration or impact is applied, there is a corresponding method by controlling a drive source such as a motor, but while the movable member is stopped. However, there is a problem that energization is required and power consumption increases. Therefore, it is desirable to hold the movable member by a mechanism that does not require electric power. However, as the number of parts increases, the assemblability and reliability may decrease, so a simple configuration is desirable.

  An object of the present invention is to hold a movable member at a required position with a simpler configuration without requiring electric power.

According to the present invention, rotation about the first rotation center line between the first position that does not cover the opening through which the light toward the image sensor passes and the second position that covers the opening. A movable member provided freely, and a pin having a peripheral surface abutting on an engagement surface which is an inner peripheral surface of a long hole formed in the movable member, and is parallel to the first rotation center line A drive member rotatably provided about a second rotation center line, and the drive member is rotated about the second rotation center line so that the peripheral surface of the pin with respect to the engagement surface and a driving means for rotating the movable member by the sliding, the drive unit, when rotating the movable member from said first position to said second position, said drive member first In the case where the movable member is rotated from the second position to the first position. The first direction wood is rotated in a second direction opposite said slot, said periphery of said pin so that the movable member is rotated to said first position and said second position The surface is one long hole having the shape of the engagement surface that is in sliding contact, the engagement surface is an inner peripheral surface of the one long hole formed in the movable member, and the engagement surface is When the movable member is in the first position, a normal direction of the engagement surface at the contact point of the peripheral surface of the pin with respect to the engagement surface toward the second rotation center line is When the movable member is directed to the second direction side with respect to the imaginary line passing through the center line of the drive pin and the second rotation center line , and the movable member is in the second position. The normal line of the engagement surface at the contact point of the peripheral surface of the pin with respect to the engagement surface toward the second rotation center line Direction is the the imaginary line passing through the center line of the drive pin and the second pivot axis, switchgear, characterized by being formed to direct the first direction side Provided.

In addition, according to the present invention, there is provided an imaging device including the above opening / closing device .

  According to the present invention, electric power is not required, and the movable member can be held at a required position with a simpler configuration.

  FIG. 1 is a perspective view of an imaging apparatus 1 according to an embodiment of the present invention. The imaging device 1 is a digital still camera, and includes a housing 2 and operation buttons 3. The operation unit 3 is, for example, an operation button for performing various operations such as a power switch of the imaging apparatus 1, imaging (shutter release, etc.), zooming, and the like. Although not shown, a display unit such as a liquid crystal display panel is attached to the rear surface of the housing 2 so that a photographed image or the like can be displayed. An opening / closing device A according to an embodiment of the present invention is provided on the front side of the housing 2. FIG. 2 is an exploded perspective view of the imaging device 1 in the vicinity of the opening / closing device A. FIG. FIG. 3 is an exploded perspective view of the opening / closing device A as seen from the back side.

  The opening / closing device A includes a base member 10, a movable member 20, a drive member 30, and a drive unit 40 that are attached to the attachment surface 4 and constitute a part of the housing 2. First, the configuration of the base member 10 will be described with reference to FIGS. 4A is a rear view of the base member 10, and FIG. 4B is a cross-sectional view taken along line XX of FIG. 4A.

  The base member 10 has a plate shape and includes a circular opening 11 which is a through hole. The opening 11 is formed at a position overlapping the opening 5 on the main body side of the image pickup apparatus 1, and these openings 5 and 11 are imaging optical systems (not a camera lens) disposed behind the opening 5. (Shown) is formed on the same axis as the optical axis. The light that has passed through the opening 11 and the opening 5 is imaged on an imaging element (not shown) such as a CCD sensor provided in the imaging apparatus 1 by the imaging optical system.

  On the back side of the base member 10, there is provided a protrusion 12 that fits into an engagement hole 6 (see FIG. 2) formed in the attachment surface 4 and serves as an attachment portion between the base member 10 and the main body of the imaging device 1. It has been. The base member 10 is fixed to the mounting surface 4 by fitting the protrusion 12 into the engagement hole 6 and by adhesion, heat caulking, screw tightening, or the like.

  On the back side of the base member 10, a recess 13 that forms a moving space for the movable member 20, a shaft portion 14 that supports the movable member 20, a recess 15 that forms a moving space for the drive member 30, and a drive member And a hole 16 for supporting 30. The recess 13 is formed with a rail portion 17 that protrudes on the back side of the base member 10 and on which the movable member 20 slides. In addition, restricting portions 18 a and 18 b that are in contact with the movable member 20 and form a rotation range thereof are formed on the periphery of the concave portion 13. The shaft portion 14 and the hole 16 are formed in a direction orthogonal to the surface direction of the base member 10, and the central axes L 1 and L 2 of the movable member 20 and the drive member 30 are parallel to each other. is there. When the base member 10 is attached to the attachment surface 4, the tip of the shaft portion 14 is inserted into a hole 7 (see FIG. 2) formed on the attachment surface 4 side.

  Next, the configuration of the movable member 20 will be described with reference to FIGS. 2 and 3. The movable member 20 includes a circular portion 20a having a larger diameter than the opening 5 and the opening 11 and opening and closing the opening 5 and the opening 11, and a triangular portion 20b. It is a plate-like member that is integrally formed in a shape like a jade ball. The shape of the movable member 20 is not limited to this, and any shape that can open and close the opening 11 can be employed.

  The movable member 20 has a hole 21 and a long hole 22. The shaft portion 14 of the base member 10 is inserted into the hole 21, and the movable member 20 is rotatably supported by the shaft portion 14. Thereby, the movable member 20 rotates around the rotation center line L1 in a direction parallel to the surface direction of the base member 10. In this embodiment, the shaft member 14 is provided in the base member 10 and the hole 21 is provided in the movable member 20. However, the base member 10 may be provided with a hole and the movable member 20 may be provided with a shaft portion. The long hole 22 constitutes a curved cam hole.

  At the time of assembling the opening / closing device A, the rail portion 17 abuts on the peripheral surface of the movable member 20 on the base member 10 side, and the movable member 20 slides on the rail portion 17 when rotating. The rail portion 17 is formed so as to avoid a portion overlapping with the opening portion 11 at a position overlapping with the trajectory along which the circular portion 20a of the movable member 20 moves.

  By providing the rail portion 17, the movable member 20 is restricted from moving in the direction of the rotation center line L <b> 1, and flutter during rotation is suppressed, and the sliding contact area between the movable member 20 and the base member 10 is suppressed. , The movable member 20 can be smoothly rotated, and the movable member 20 can be prevented from being damaged. Moreover, since the rail part 17 is formed avoiding the part which overlaps the opening part 11 among the circular parts 20a of the movable member 20, even if it gets damaged, it does not expose to the outside through the opening part 11. , Improve aesthetics. The cross-sectional shape of the rail portion 17 is best in terms of slidability as a cross-sectional shape, and ideally it is in line contact, but the surface of the sliding portion is appropriately flat for the purpose of reducing the damage by applying concentrated force to the sliding portion. You may increase the width.

  A rail portion 4a (see FIG. 2) similar to the rail portion 17 is also provided on the mounting surface 4 side of the imaging device 1, and the peripheral surface of the movable member 20 on the mounting surface 4 side when the switchgear A is assembled. The rail portion 4a comes into contact with the movable member 20, and the movable member 20 slides on the rail portion 4a when rotating. Thus, the movable member 20 rotates within the recess 13 of the base member 10 while the movement in the direction of the rotation center line L1 is restricted by the rail portion 17 and the rail portion 4a.

  Next, the structure of the drive member 30 is demonstrated with reference to FIG.2, FIG3 and FIG.5. FIG. 5A is a view showing a mode in which the driving member 30 is mounted on the movable member 20, and FIG. 5B is a cross-sectional view taken along line YY in FIG. 5A.

  The drive member 30 includes shaft portions 31a and 31b that protrude toward the base member 10 side and the mounting surface 4 side, respectively, and a pin 32 that is separated from the shaft portions 31a and 31b. The shaft portions 31a and 31b have both center axes that coincide with the rotation center line L2, the shaft portion 31a is formed in the hole 16 of the base member 10, and the shaft portion 31b is formed in the bottom portion of the recess 8 on the mounting surface 4 side. The holes 9 are inserted respectively. Thereby, the drive member 30 rotates in the direction parallel to the surface direction of the base member 10 around the rotation center line L2.

  In this embodiment, the holes 16 and 9 are provided on the base member 10 and the mounting surface 4 side, and the shaft portions 31a and 31b are provided on the drive member 30, but the holes are provided on the drive member 30 and the base member 10 or the mounting surface 4 side. It is good also as a structure which provided the axial part in.

  As shown in FIG. 5B, a gap is formed between the shaft portion 31a and the shaft portion 31b, and the end portion of the movable member 20 can be moved forward and backward. Further, a rotor magnet 41 constituting a drive unit 40 described later is fixed to the shaft portion 31b.

  The pin 32 has a cylindrical shape whose central axis is parallel to the rotation center line L2. As shown in FIGS. 5A and 5B, the pin 32 is inserted into the long hole 22, and the peripheral surface thereof abuts on the engagement surface 22 a that is the inner peripheral surface of the long hole 22. When the drive member 30 is rotated by a drive unit 40 described later, the peripheral surface of the pin 32 slides on the engagement surface 22a, and rotational force is applied to the movable member 20.

  Next, the configuration of the drive unit 40 will be described with reference to FIGS. In this embodiment, the drive unit 40 is a rotary solenoid type actuator, but other actuators can also be used. The drive unit 40 includes the rotor rotor magnet 41 fixed to the shaft portion 31b, the stator yoke 42, and the excitation coil 43 as described above, and includes the recess 15 on the base member 10 side and the recess 5 on the mounting surface 4 side. And is accommodated in a space formed by

  The rotor magnet 41 is a cylindrical permanent magnet whose outer peripheral surface is magnetized in the circumferential direction with two poles (N, S), and its central axis coincides with the rotation center line L2. The shaft portion 31b is inserted into the center hole of the rotor magnet 41, and the rotor magnet 41 is fixed to the shaft portion 31b by adhesion or the like.

  The stator yoke 42 is made of a soft magnetic material, and has an opening 42a and a slit 42b communicating with the opening 42a, and the outer shape is a horseshoe shape. The opening 41a is formed in a C shape so as to surround the rotor magnet 41, and the rotor magnet 41 is disposed in the opening 41a. A portion of the stator yoke 42 around the opening 42a forms a magnetic pole that faces the rotor magnet 42a with a gap.

  The exciting coil unit 43 is configured by winding a coil around a bobbin having a through hole. The exciting coil unit 43 is attached to the stator yoke 42 by inserting a part of the stator yoke 42 into the through hole of the bobbin.

  The drive unit 40 having such a configuration supplies a drive current to the coil of the exciting coil unit 43 to excite the stator yoke 42, so that the rotor magnet 41 rotates around the axis of the rotor magnet 41 in the opening 42a. In addition, the direction of rotation can be controlled by the sign of the drive current. As a result, the drive member 30 rotates about the rotation center line L2.

  Next, the operation of the opening / closing device A having such a configuration will be described with reference to FIGS. 6A to 6C are operation explanatory views of the opening / closing device A viewed from the back side of the base member 10, and FIG. 6A shows the movable member 20 opening the opening 11 (and the opening 5). 6C, when the movable member 20 is in the closed position covering the opening 11 (and the opening 5), FIG. 6B shows the movable member 20 in the open position and the closed position. The case where it exists in the middle position is shown. FIGS. 7A to 7C are enlarged views around the rotor magnet 41 in FIGS. 6A to 6C, respectively, and are diagrams in which the magnetic poles of the rotor magnet 41 are added.

  In the state shown in FIG. 6A, the movable member 20 does not overlap the opening 11 (and the opening 5), and is located at a position where the movable member 20 does not optically affect the photographing. The opening 11 (and the opening 5) is in an open state, and an image can be taken by the imaging device 1. When the drive member 30 is rotated clockwise (in the direction of the arrow d1 in FIG. 7A) from the state of FIG. 6A, the movable member 20 is rotated counterclockwise in FIG. The state shown in FIG. 6C is reached via the state shown in FIG. When the movable member 20 rotates counterclockwise, as shown in FIG. 6C, the side portion (left side in the figure) of the movable member 20 contacts the restricting portion 18b, and the movable member 20 rotates. It is physically stopped in the closed position.

  In the state of FIG. 6C, the circular portion 20a of the movable member 20 is at a position overlapping the opening 11 (and the opening 5), and the opening 11 (and the opening 5) is closed. Therefore, the movable member 20 can prevent finger contact with the imaging optical system of the imaging device 1 provided behind the opening 5, damage to the imaging optical system, and the imaging optical system is protected.

  When the drive member 30 is rotated counterclockwise (in the direction of arrow d2 in FIG. 7C) from the state of FIG. 6C, the movable member 20 is rotated clockwise in FIG. The state returns to the state of FIG. 6A through the state of 6B. When the movable member 20 rotates clockwise, as shown in FIG. 6A, the side portion (right side in the figure) of the movable member 20 contacts the restricting portion 18a, and the rotation of the movable member 20 is released. It is physically stopped at the position.

  In this way, in the opening / closing device A, the drive member 30 can be rotated by energizing the excitation coil unit 43 and the polarity thereof, and the movable member 20 can be rotated between the open position and the closed position. In the embodiment, the opening 11 (and the opening 5) that is an opening / closing target part can be opened and closed. Since the rotation range of the movable member 20 is regulated by the regulating portions 18a and 18b, the movable member 20 can be more reliably positioned at the open position and the closed position.

  In the present embodiment, the restricting portions 18a and 18b are formed so as to come into contact with the movable member 20. However, the rotation of the movable member 20 is controlled by contacting the drive member 30 and restricting the rotation range of the drive member 30. The moving range may be restricted. Further, the rotation range of the movable member 20 may be restricted only on the closed side. That is, it is also possible to employ a configuration in which only a configuration corresponding to the restriction portion 18b is provided and a configuration corresponding to the restriction portion 18a is not provided. When the movable member 20 is positioned at the closed position, the opening 11 (and the opening 5) is securely closed, so that the positional accuracy becomes more strict. When the movable member 20 is positioned at the open position, the opening 11 This is because the position accuracy is not so strict because (and the opening 5) need only be open.

  Next, in this embodiment, since a rotary solenoid type actuator is used as the drive unit 40, the stator yoke 42, the rotor magnet 41, The holding force of the movable member 20 in the open position and the closed position can be increased using the detent torque between the two.

  That is, when the movable member 20 is in the open position, a detent torque is generated so that the rotor magnet 41 rotates in the direction of the arrow d2 (FIG. 7C). A detent torque is generated so as to rotate in the direction of the arrow d1 (FIG. 7A). The direction of the detent torque can be set by the relative position between the N pole portion and the S pole portion of the rotor magnet 41 and the stator yoke 42. Examples of the magnetic poles of the rotor magnet 41 shown in FIGS. 7A to 7C are shown.

  In the state of FIG. 7A, when the magnetic teeth 421 of the stator yoke 42 are excited to the N pole and the magnetic teeth 422 are excited to the S pole, the rotor magnet 41 rotates in the direction of the arrow d1, and the state of FIG. Then, the state shown in FIG. 7C, when the magnetic teeth 421 of the stator yoke 42 are excited to the S pole and the magnetic teeth 422 are excited to the N pole, the rotor magnet 41 rotates in the arrow d1 direction, The state is reached as shown in FIG. The detent torque becomes 0 in the range before and after the position of the position shown in FIG. 7B, and the direction is reversed when the detent torque exceeds the range.

  In the state of FIG. 7A, the detent torque acts to rotate the rotor magnet 41 in the direction opposite to the arrow d1, and this acts to rotate the movable member 20 to the open position side. Since the rotation of the movable member 20 is restricted by the restricting portion 18a, the movable member 20 is held at the open position. In the state of FIG. 7C, the detent torque acts to rotate the rotor magnet 41 in the direction opposite to the arrow d2, and this acts to rotate the movable member 20 toward the closed position. Since the rotation of the movable member 20 is restricted by the restricting portion 18b, the movable member 20 is held at the open position. Thus, even when the supply of the drive current to the coils of the exciting coil unit 43 is stopped, the movable member 20 can be held in the open position and the closed position by the detent torque.

  In addition, when the movable member 20 is located at the intermediate position in FIG. 6B (FIG. 7B), when the drive current supply to the coil of the exciting coil unit 43 is cut off due to some accident. The movable member 20 may be rotated to the open position or the closed position by the detent torque. The rotation destination can be selected by setting the detent torque direction switching position to the closed position side from the intermediate point if you want to move it more to the open position, and detent torque direction if you want to move more to the closed position. The switching position may be set to the open position side from the intermediate point.

  Next, a structure for preventing the movable member 20 from rotating freely when vibration or impact is applied to the imaging apparatus 1 will be described with reference to FIG. FIGS. 8A and 8B show a state in which the stator yoke 42 and the exciting coil unit 43 have been removed from FIGS. 7A and 7C, and FIG. 8A shows the movable member 20 in the open position. FIG. 8B shows the positional relationship between the long hole 22 and the pin 41 when the movable member 20 is in the closed position.

  The detent torque described above also has a function of holding the movable member 20 in the open position and the closed position. In this embodiment, the open position and the closed position of the movable member 20 are configured by the configuration of the engagement surface 22a of the elongated hole 22 of the movable member 20. Increase the ability to hold in position.

  8A and 8B, the arrow d3 indicates the rotation direction of the movable member 20 when rotating from the open position to the closed position, and the arrow d4 indicates the case when rotating from the closed position to the open position. The rotation direction of the movable member 20 is shown respectively.

  The arrows d1 and d2 are as described above. The arrow d1 indicates the rotation direction of the drive member 30 that rotates the movable member 20 from the open position to the closed position, and the arrow d2 indicates the movable member 20 from the closed position to the open position. The rotation direction of the drive member 30 to be rotated is shown. In the case of the shape of the engagement surface 22a in the present embodiment, when the drive member 30 is rotated in the direction of the arrow d1 from the state of FIG. 8A, the rotational force in the direction of the arrow d4 is slightly applied to the movable member 20. Thereafter, the action point between the engagement surface 22a and the pin 32 moves due to the play of the mechanism and the bending of the member, the turning force in the direction of the arrow d3 acts, and the movable member 20 rotates to the closed position. Further, when the drive member 30 is rotated in the direction of the arrow d2 from the state of FIG. 8B, the rotating force in the direction of the arrow d3 is slightly applied to the movable member 20 and then is engaged due to the play of the mechanism or the bending of the member. The action point of the mating surface 22a and the pin 32 moves, the turning force in the direction of the arrow d4 acts, and the movable member 20 rotates to the open position.

  The line L4 is a virtual line passing through the rotation center line L2 and the center line L3 of the pin 32. The action point P indicates the action point of the force that acts on the pin 32 from the engagement surface 22a when vibration or impact acts on the imaging device 1 and the movable member 20 tries to rotate by inertial force. (A) shows the action point when the movable member 20 tries to rotate in the direction of the arrow d3, that is, when it tries to rotate in the direction from the open position to the closed position, and FIG. The action point when the member 20 tries to rotate in the direction of the arrow d4, that is, when it tries to rotate in the direction from the closed position toward the open position is shown.

  An arrow dV indicates a normal direction of the engagement surface 22 at the point of action P toward the rotation center line L2, is orthogonal to the tangent L5 of the peripheral surface of the pin 32 at the point of action P, and the center line L3 of the pin 32 Is the direction of passing through. In the case of this embodiment, the engagement surface 22a is oriented in the direction of the arrow d2 with respect to the imaginary line L4 in the state of FIG. 8A, and the normal direction dV of FIG. In the state, the normal direction dV is formed so as to be directed in the direction of the arrow d1 from the virtual line L4. Thereby, it can prevent that the movable member 20 rotates freely. Hereinafter, the reason will be described in the case of FIG.

  Assuming that the frictional force between the engaging surface 22a and the pin 32 is negligibly small, when the movable member 20 tries to rotate due to vibration or impact on the imaging device 1, the engaging surface 22a is moved to the pin 32. The direction of the acting force is the normal direction dV. In the state of FIG. 8A, when a force is applied to the pin 32 in the direction of the normal line dv, turning force in the direction of the arrow d <b> 2 is generated in the drive member 30. FIG. 9A is an explanatory diagram showing a force relationship acting on the drive member 30 when the movable member 20 attempts to rotate from the open position of FIG. 8A to the closed position with inertial force. It is.

  In FIG. 9A, the vector F indicates the force in the normal direction dV acting on the pin at the action point P, with the center line L3 of the pin 32 as the starting point. The vectors F1 and F2 are component forces of the force indicated by the vector F, the vector F1 indicates the component force in the imaginary line L4 direction, and the vector F2 indicates the component force in the imaginary line L4 'direction orthogonal to the imaginary line L4. Thus, the component force indicated by the vector F2 is a force for rotating the drive member 30, and the direction thereof is directed to the left side in FIG. 8, so that the rotational force in the direction of the arrow d2 in FIG. Will occur.

  When the drive member 30 rotates in the arrow d2 direction, the rotational force in the arrow d4 direction acts on the movable member 20 from the drive member 30. That is, the rotating force in the direction from the closed position to the open position acts on the movable member 20. As a result, when the movable member 20 attempts to rotate from the open position of FIG. 8A to the closed position with inertial force, mechanically, a reverse rotational force acts on the movable member 20, Resist the rotation of the movable member 20. The larger the size of the vector F2 in FIG. 9A, the more the movable member 20 can be prevented from rotating freely. However, if the value is too large, the drive unit 40 rotates more when the movable member 20 is rotated. Power is required. Therefore, the shape (normal direction dv) of the engagement surface 22a is set in consideration of the balance between the rotation prevention of the movable member 20 and the driving force necessary for the rotation of the movable member 20 by the drive unit 40. Is desirable.

  The case of FIG. 8B is the same as the case of FIG. 8A, and the normal direction dV is directed in the direction of the arrow d1 with respect to the imaginary line L4. When an attempt is made to rotate in the direction from the closed position toward the open position, a rotational force in the direction of the arrow d1 is generated in the drive member 30, and a rotational force in the direction of the arrow d3 acts on the movable member 20 from the drive member 30. That is, the rotating force in the direction of the open position → the closed position acts on the movable member 20. As a result, mechanically, a turning force in the opposite direction acts on the movable member 20 to resist the rotation of the movable member 20.

  Thus, in this embodiment, when the movable member 20 is in the open position and the closed position, the movable member 20 can be held at those positions without supplying power to the exciting coil unit 43. In addition, since the holding force of the movable member 20 is exhibited by the shape of the engagement surface 22, no additional parts are required, and the movable member 20 can be held at a required position with a simpler configuration. Further, the holding force of the movable member 20 can be further improved by the detent torque of the drive unit 40.

  Next, a configuration example of a control unit of the opening / closing device A mounted on the imaging device 1 will be described with reference to FIG. FIG. 9B is a block diagram illustrating a configuration example of the control unit 100 of the opening / closing device A. The control unit 100 includes a CPU 101, a ROM 102, and a RAM 103. These can be combined with those of the control unit of the imaging apparatus 1. The CPU 101 executes a program stored in the ROM 102 and controls the excitation coil unit 43 of the drive unit 40 (coil energization control). The ROM 102 stores programs executed by the CPU 101 and fixed data. The RAM 103 stores variable data. The ROM 104 and the RAM 105 may be other storage means.

  The operation unit 104 includes a switch or the like that instructs the user to open and close the movable member 20, and the CPU 101 opens and closes the movable member 20 in response to a user operation on the operation unit 101. The CPU 101 can also perform control to automatically open and close the movable member 20 when the imaging apparatus 1 is turned on or off.

  The sensor 105 is a sensor that detects the position of the movable member 20, and the CPU 101 detects the current position of the movable member 20 based on the detection result of the sensor 105. The sensor 105 is, for example, a photo sensor, for example, a position where the movable member 20 is detected when the movable member 20 is in the open / closed position, and a position where the movable member 20 is detected when the movable member 20 is in the closed position. Provided.

  The drive circuit 106 supplies a drive current to the coils of the exciting coil unit 43 based on a control signal from the CPU 101. In the case of this embodiment, it is sufficient to supply power to the exciting coil unit 43 only when the movable member 20 is rotated. After the movable member 20 reaches the open position and the closed position, the power supply can be cut off, and the power consumption is reduced. Can be reduced.

<Other embodiments>
In the above embodiment, the opening / closing device A is applied to the imaging device 1 which is a digital still camera. However, the opening / closing device of the present invention is a digital video camera, a camcorder in which a digital video camera and a recording device are integrated, and other lenses. The present invention can be widely applied to devices that include optical elements such as those that require protection thereof, or devices that require opening and closing of the opening.

  Moreover, in the said embodiment, when the movable member 20 exists in an open position and a closed position by the structure of the engaging surface 22a, it was set as the structure which can prevent the movable member 20 each turning freely (FIG. 8 ( a) and (b)), depending on the device on which the opening / closing device A is mounted, the engagement surface 22a is formed so as to prevent the movable member 20 from rotating freely only when the movable member 20 is in the open position. The engaging surface 22a may be configured to prevent the movable member 20 from rotating freely only when the movable member 20 is in the closed position.

1 is a perspective view of an imaging apparatus 1 according to an embodiment of the present invention. 2 is an exploded perspective view of the imaging device 1 in the vicinity of the opening / closing device A. FIG. It is an exploded perspective view of opening and closing device A seen from the back side. (A) is a rear view of the base member 10, (b) is sectional drawing in alignment with line XX of Fig.4 (a). (A) is a figure which shows the aspect which attached the drive member 30 to the movable member 20, (b) is sectional drawing which follows the line YY of Fig.5 (a). (A) thru | or (c) is operation | movement explanatory drawing which looked at the opening / closing apparatus A from the back side of the base member 10, (a) is the open position where the movable member 20 does not cover the opening part 11 (and opening part 5). (C) shows a case where the movable member 20 is in a closed position covering the opening 11 (and the opening 5), and (b) shows a case where the movable member 20 is in an intermediate position between the open position and the closed position. Show. (A) thru | or (c) is an enlarged view of the rotor magnet 41 periphery of FIG. 6 (a) thru | or (c), respectively, and is the figure which added the magnetic pole of the rotor magnet 41. FIG. (A) And (b) shows the state which removed the stator yoke 42 and the exciting coil unit 43 about FIG. 7 (a) and FIG.7 (c), (a) is the case where the movable member 20 exists in an open position. (B) shows the positional relationship between the long hole 22 and the pin 41 when the movable member 20 is in the closed position. (A) is a figure which shows the force relationship which acts on the drive member 30 when the movable member 20 tries to rotate to the closed position by the inertial force from the open position of Fig.8 (a), (b) is opening-and-closing. 3 is a block diagram illustrating a configuration example of a control unit 100 of the device A. FIG.

Explanation of symbols

A Opening / closing device 1 Imaging device 5, 11 Opening 20 Movable member 30 Drive member 32 Pin 40 Drive unit

Claims (5)

Movable provided so as to be rotatable about a first rotation center line between a first position that does not cover the opening through which light that passes toward the image sensor passes and a second position that covers the opening. Members,
A pin having a peripheral surface that abuts against an engagement surface, which is an inner peripheral surface of the elongated hole formed in the movable member, around a second rotation center line parallel to the first rotation center line; A drive member provided rotatably,
Drive means for rotating the drive member about the second rotation center line and rotating the movable member by sliding the peripheral surface of the pin with respect to the engagement surface ;
The driving means includes
When the movable member is rotated from the first position to the second position, the drive member is rotated in the first direction,
When rotating the movable member from the second position to the first position, the drive member is rotated in a second direction opposite to the first direction;
The long hole is one long hole having a shape having the engagement surface with which the peripheral surface of the pin slides so that the movable member rotates to the first position and the second position,
The engagement surface is an inner peripheral surface of the one long hole formed in the movable member,
The engagement surface is
When the movable member is in the first position, a normal direction of the engagement surface at the contact point of the peripheral surface of the pin with respect to the engagement surface toward the second rotation center line is , Directed to the second direction side from a virtual line passing through the center line of the drive pin and the second rotation center line , and
When the movable member is in the second position, a normal direction of the engagement surface at the contact point of the peripheral surface of the pin with the engagement surface toward the second rotation center line side is The opening / closing device is formed so as to be directed to the first direction side from an imaginary line passing through a center line of the drive pin and the second rotation center line . Restricting the rotation range in contact with the movable member, to claim 1, characterized in that it comprises a second regulating portion of the first regulating portion and the second position side of the first position side The switchgear described. The driving means includes
A rotor magnet composed of a permanent magnet concentric with the second rotation center line;
A stator yoke having a portion surrounding the rotor magnet;
An exciting coil for exciting the stator yoke and rotating the rotor magnet;
The switchgear according to claim 2 , further comprising: The driving means includes
When the movable member is rotated from the second position to the first position, the detent torque that presses the movable member to the first restricting portion even after the power supply to the exciting coil is cut off. Occur and
When the movable member is rotated from the first position to the second position, the detent torque that presses the movable member to the second restricting portion even after the power supply to the exciting coil is cut off. The switchgear according to claim 3 , wherein the switchgear is generated. An imaging apparatus comprising the opening / closing device according to claim 1 .

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