JP2010122518A - Optical mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical mechanism which is simple in structure, is simple in its control operation, and can accurately stop a rotating member. <P>SOLUTION: A charge mechanism 10 of the optical mechanism includes: a charge lever 7 which is biased by a torsion spring 13 and charges a spring for biasing a movable mirror moving back and forth between an entering position where it enters an optical path of an imaging optical system and a retreating position where it retreats from the optical path of the imaging optical system or a mechanical shutter for adjusting exposure time of an imaging device; a cam 4 which is a member to rotate, and a member to perform charge of the spring performed in the charge lever 7 and release thereof; and a locking lever 11 which suppresses inertial rotation of the cam 4 by locking with a portion of the cam 4 or a portion of the charge lever 7 by kinetic energy produced when performing release after charging operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical mechanism for switching the state of a subject light beam captured from an imaging optical system.

  Conventionally, as an optical mechanism for switching the state of a subject light beam captured from an imaging optical system, for example, in a single-lens reflex camera, the entry position (down position) of the imaging optical system into the optical path and the withdrawal from the optical path A movable mirror device having a movable mirror (main mirror) reciprocating between the position (up position) and a shutter device for adjusting the light amount and opening / closing the optical path are provided. The movable mirror device and the shutter device have a charge spring for performing the operation, and a charge mechanism for charging the charge spring is necessary for the operation.

  12A and 12B are perspective views illustrating an example of an optical mechanism including a conventional shutter device and a charging mechanism. FIG. 12A shows a state after charging, and FIG. 12B shows a charging state. In FIG. 12 and FIG. 13 described later, the optical axis of the subject light beam taken in by the photographing optical system is indicated by “O”.

  As shown in FIG. 12, the shutter device 101 is a mechanical shutter device including a shutter film 110, and the shutter film 110 is a first spring that is built in the shutter device 101 by the charge mechanism 102. It is driven to the closed position while being urged by a certain charge spring (not shown). Further, the shutter device 101 is provided with an electromagnet (not shown), and the opening and closing of the shutter film 110 in a charged state is controlled.

  The charge mechanism 102 includes a charge lever 106 for rotating the shutter lever 108 of the shutter device 101 to charge the charge spring. The charge lever 106 is rotated by a drive motor 103 through a gear train. The rotational position is controlled by the driven cam 105.

  As shown in FIG. 12A, when the cam follower 106a of the charge lever 106 reaches the cam top portion 105a by the rotation of the cam 105, the charge spring enters a charged state. Thereafter, when the cam 105 rotates in the S1 direction and reaches the cam bottom portion 105b, the charge lever 106 returns to the charge completion position shown in FIG. Thereafter, the charge spring is released under the control of the electromagnet, and the shutter film 110 is opened and closed. If the charging completion state is normal, the charge lever 106 and the shutter lever 108 are separated from each other with a slight gap. The rotational phase of the cam 105 is detected by a PI (photo interrupter) 111 and a motor pulse encoder (not shown), and the rotation of the drive motor 103 is controlled.

  When the cam 105 rotates to the cam bottom portion 105b, the cam follower 106a does not stop suddenly within a predetermined range due to inertia of each component such as a cam and a gear, and overruns beyond an allowable range (rotation angle range). You will ride on the cam. In this riding state, there is a possibility that the above-described gap disappears and the shutter lever 108 is pressed by the charge lever 106 and rotated. This pressing rotation changes the state of the shutter film 110, which may cause inconvenience in subsequent control of the shutter device 101.

  In order not to cause the above-described inconvenience, it is conceivable to increase the range of the cam bottom portion 105b of the cam 105 and widen the allowable range of the cam 105. However, this causes a delay in timing in the photographing sequence. When continuous shooting is performed, there is a problem in that it takes a long time to shoot every frame and it is difficult to increase the speed.

  Note that the movable mirror device in the conventional single-lens reflex camera is also driven to be charged by the charge mechanism as in the case of the shutter device 101. FIG. 13 is a perspective view showing an example of an optical device including the conventional movable mirror device and a charging mechanism.

  As shown in FIG. 13, a conventional movable mirror device 201 includes a movable mirror (main mirror) 211. The movable mirror 211 includes a charge spring 209 and a down biasing spring as second springs in the claims. A support shaft that is pivotable between an entry position P1 that has entered the optical path of the subject light that is the first position and a retracted position P2 that is retracted from the optical path that is the second position in a state of being biased through 210. 212. The mirror device side lever 208 is rotationally driven in the M2 direction via the charge lever 206 by a cam 205 that rotates in the M1 direction using the drive motor 203 of the charge mechanism 202 as a drive source. The charge spring 209 is charged by the rotation of the mirror device side lever 208, and the movable mirror 211 is rotationally driven to the entry position P1. Further, when the cam 205 rotates and the charge lever 206 rotates from the charge position to the release position, the charge spring 209 is released, and the movable mirror 211 is rotationally driven to the retracted position P2 in the M3 direction. In this charge mechanism 202, the same drive control as in the case of the charge mechanism 102 for the shutter device described above is performed, and the stop operation of the cam 205 has the same problem.

  Patent Documents 1, 2, and 3 are disclosed in order to solve the above-described problems with the conventional shutter device or the high-speed continuous shooting by the charge mechanism of the movable mirror device.

  Patent Documents 1, 2, and 3 employ a structure in which a locking member for mechanically quickly stopping a charge driving cam is disposed and the cam is suddenly stopped.

  Specifically, in the one disclosed in Patent Document 1, two locking members biased toward the cam are fitted into locking grooves provided at the operating points of the mirror entering position and the retracting position of the cam, and the cam Is stopped (see FIG. 2 of Patent Document 1). After stopping, a release plate (see FIG. 3 of Patent Document 1) having a projection provided coaxially with the cam by a spring so as to be able to rotate independently of the cam pushes up the locking lever to release the locking. (See FIG. 4 of Patent Document 1).

  In the one disclosed in Patent Document 2, the latch receiving member provided on the gear different from the torque transmission path is fitted with the latch member provided on the charge lever to stop the rotation of the cam. . Thereafter, the motor torque is transmitted, the locking receiving member is rotated, and the locking center is pushed by the oval type locking member having play, thereby releasing the locking (FIG. 2). 3).

In what is disclosed in Patent Document 3, two locking members that are biased to the opposite side with respect to the cam, are provided with a locking release member, and are held by a holding member provided separately from the locking release member, The cam is fitted in a locking groove provided at the operating point of the mirror entering position and retracted position, and the rotation of the cam is stopped. When the locking member fits into the locking groove of the cam, the locking release member is unlocked substantially simultaneously. However, since the locking member is pressed while the rotational force is applied to the cam, the cam continues to stop. When the cam stops, the pressing force from the cam to the locking member disappears, the urging force acts against friction, the locking member retracts to the opposite side of the cam, and the locking is released ( (See FIGS. 4 and 5 of Patent Document 3).
JP 2005-331698 A JP 2006-126389 A JP 2006-184717 A

  The charge mechanism disclosed in Patent Documents 1, 2, and 3 described above has a complicated structure. A plurality of locking members are mounted, which hinders downsizing. Further, in Patent Documents 1 and 3, the drive motor is driven and stopped twice to increase the stop accuracy, and the control operation is complicated.

  The present invention has been made to solve the above-described problems, and has an object to provide an optical mechanism that is simple in structure, simple in control operation, and capable of stopping a rotating member with high accuracy. And

  The optical mechanism according to claim 1 of the present invention is a charge member that is biased by a first spring, and includes a first position that enters the optical path of the imaging optical system and the optical path of the imaging optical system. A charge member that charges a movable mirror that reciprocates between the second position for retraction or a mechanical shutter that adjusts the exposure time of the image sensor, and a member that rotates. The rotating member, which is the member that charges and releases the charging member of the first spring, and the kinetic energy of the charging member or the rotating member that is generated when the charge of the first spring is released. And a part of the rotating member, or a part of the charge member, and a locking member that suppresses inertial rotation of the rotating member.

  An optical mechanism according to a second aspect of the present invention is the optical mechanism according to the first aspect, wherein the locking member is biased in a direction opposite to a direction in which the locking member operates. After the locking is performed, the locking is released by the urging.

  An optical mechanism according to a third aspect of the present invention is the optical mechanism according to the first aspect, wherein the kinetic energy is caused by a change in operating speed of the charge member when the charge of the first spring is released. The resulting kinetic energy.

  An optical mechanism according to a fourth aspect of the present invention is the optical mechanism according to the first aspect, wherein the kinetic energy is caused by a change in rotational speed of the rotating member when the charge of the first spring is released. The resulting kinetic energy.

  An optical mechanism according to a fifth aspect of the present invention is the optical mechanism according to the first aspect, wherein the kinetic energy is applied to a part of the charge member and the rotation when the charge of the first spring is released. It is collision energy that collides with a part of the member.

  According to the present invention, it is possible to provide an optical mechanism that is simple in structure, simple in control operation, and capable of stopping the rotating member with high accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a charging mechanism incorporated in an optical mechanism as a first embodiment of the present invention. FIG. 2 is a schematic diagram showing each operation state of the charge mechanism. In addition, the rotation direction or rotation direction of a structural member shall be represented by the rotation direction on the plane seen from the upper side of each perspective view including the case of other embodiment.

  The charge mechanism 10 of the present embodiment shown in FIG. 1 constitutes an optical mechanism together with the shutter device 101 of FIG. 12 or the movable mirror device 201 of FIG. Therefore, the charge mechanism 1 of this embodiment is incorporated in place of the conventional charge mechanism 102 of FIG. 12 or the conventional charge mechanism 202 of FIG. 13, and the optical mechanism of this embodiment is configured. Reference numerals in FIGS. 12 and 13 are applied to components common to the shutter device 101 and the mirror device 201.

  The charging mechanism 10 is fixed to a driven gear 104 that is rotationally driven in one clockwise direction by a drive motor 103, and a cam 4 as a rotating member that is rotatably supported by the cam shaft 3, and a lever support shaft 8. And a charge lever 7 as a charge member supported rotatably. The cam shaft 3 and the lever support shaft 8 are fixed to, for example, a mirror box in which the shutter device 101 is incorporated.

  The cam 4 includes a cam portion having a cam top portion 4a and a cam bottom portion 4b, and further includes a cam pin 4c that is a latch receiving member protruding to the upper surface side.

  The charge lever 7 abuts and slides on the cam 4, a cam follower 7 a that slides against the cam 4, for example, a drive pin 7 b that abuts on the shutter lever 108 (FIG. 12) of the shutter device 101 and charges, , And a locking lever 11 as a locking member is mounted on the upper surface of the locking lever stopper 7c so as to be rotatable by a locking lever support pin 7d.

  The charge lever 7 is rotatably supported in a state where the shaft hole is fitted in the lever support shaft 8, and the torsion spring 13, which is the first spring in the claims, is inserted into the lever support shaft 8. The charge lever 7 is urged clockwise. Therefore, the cam follower 7a of the charge lever 7 is in sliding contact with the outer peripheral cam portion of the cam 4 as the cam 4 rotates clockwise. Note that both ends of the hook of the torsion spring 13 are suspended from the mirror box side stopper 9 and the charge lever 7.

  The locking lever 11 is provided with a claw at the tip, and is biased counterclockwise by a torsion spring 12 inserted into the locking lever support pin 7d.

  In a state where the charge lever 7 does not receive an impact force (external force) around the lever support shaft 8, the locking lever 11 rotates counterclockwise and comes into contact with the locking lever stopper 7 c. It is held in a state retracted from the part. However, as will be described later, when the charge lever 7 suddenly stops rotating and receives an impact force around the lever support shaft 8, the claw portion of the locking lever 11 rotates clockwise due to inertial force, The cam 4 protrudes toward the cam 4 and can be locked with the cam pin 4c of the cam 4. As will be described later, the locking operation temporarily prevents the cam 4 from rotating clockwise.

  A charging operation of the charging mechanism 10 having the above-described configuration will be described with reference to FIG. Hereinafter, the charge mechanism 10 will be described as an operation when the shutter device 101 shown in FIG. 12 is driven to charge. However, when the charge spring 209 is charge-driven via the mirror device side lever 208 of the movable mirror device 201 shown in FIG. The operation of is the same.

  FIG. 2A is a schematic diagram showing each operation state of the charging mechanism 10. FIG. 2A shows a charging state in which the cam follower of the charge lever has reached the cam top position, and FIG. FIG. 2C shows a state where the cam follower has reached the cam bottom, and immediately after that, the impact lever receives an impact force and the locking lever starts to rotate due to an inertial force. FIG. 2 (D) shows a state where the locking lever is locked with the locking pin, and FIG. 2 (E) shows a state where the cam is stopped and the locking lever is unlocked. The waiting state of the charging operation is shown.

  In the charging mechanism 10, when charging a shutter film urging charge spring (not shown), which is the second spring in the claims of the shutter device 101, the driven gear 104 is driven by the drive motor 103 through the gear train. At the same time, the cam 4 is driven to rotate clockwise. When the cam follower 7a of the charge lever 7 reaches the cam top portion 4a from the cam bottom portion 4b of the cam 4 and pushes the shutter lever 108 to the left, the charging operation of the charge spring is finished (FIG. 2A). This timing is detected by the PI 111.

  Thereafter, the cam 4 rotates by a predetermined rotation angle, and the cam follower 7a of the charge lever 7 comes into contact with the cam bottom portion 4b (FIG. 2B).

  When the cam follower 7a contacts (collises) the cam bottom portion 4b, the rotation speed of the charge lever 7 changes suddenly. Due to the kinetic energy, the locking lever 11 receives an impact force and rotates clockwise by the inertial force, so that the claw portion of the locking lever 11 protrudes from the side surface of the charge lever 7 (FIG. 2C). . Therefore, the cam pin 4c of the cam 4 reaches the position of the claw portion of the locking lever 11 to be locked, and the rotation due to the clockwise inertia of the cam 4 thereafter is prevented, suddenly stops and the charging operation is completed. (FIG. 2D). In this state, a slight gap is maintained between the drive pin 7b of the charge lever 7 and the shutter lever 108, and the position of the shutter lever 108 may affect the shutter film opening / closing operation of the shutter device 101. Absent.

  After completion of the series of charging operations described above, in the shutter device 101, the opening / closing control of the shutter film 110 is performed according to an instruction from a camera control unit (not shown), and the charge spring is released. When the charging mechanism 10 is incorporated in the movable mirror device 201, the charging spring is released in the state where the above-described charging operation is completed. That is, the state of completion of the charge operation shown in FIG. 2D corresponds to the charge release state of the charge spring 209.

  After the sudden stop of the cam 4 described above, the locking lever 11 is rotated counterclockwise by the urging force of the torsion spring 12, and the locking between the claw portion and the cam pin 4c of the cam 4 is released (see FIG. 2 (E)). Therefore, it is possible to shift to the recharge operation that is continuously executed as it is.

  As described above, the optical mechanism to which the charging mechanism 10 of the present embodiment is applied causes the cam 4 to suddenly stop at the cam bottom phase using the inertial force when the charge lever 7 contacts the cam bottom portion 4b of the cam 4. Can do. Accordingly, it is possible to reduce a margin of the rotation angle of the cam bottom portion 4b of the cam 4, reduce the rotation time required for one charge operation of the cam 4, and enable high-speed continuous shooting.

  In addition, after the sudden stop at the cam bottom portion 4b of the cam 4, the locking lever 11 uses the biasing force of the torsion spring 12 to retract the locking lever 11 to the unlocked position with respect to the cam pin 4c. A complicated mechanism for release is unnecessary, and a simple charge mechanism can be configured.

  Next, a charge mechanism incorporated in the optical mechanism of the second embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a perspective view of a charge mechanism incorporated in the optical mechanism of the present embodiment. FIG. 4 is an enlarged plan view around the charge lever locking pin of the charge mechanism. FIG. 5 is an operation state diagram of the charge mechanism.

  A charge mechanism 10A of the present embodiment shown in FIG. 3 constitutes an optical mechanism together with the shutter device 101 of FIG. 12 or the movable mirror device 201 of FIG.

  The charging mechanism 10A is fixed on a driven gear 104 that is driven to rotate clockwise through a gear train by a drive motor 103, and a cam 4A that is a rotating member that is rotatably supported by the camshaft 3, and a lever. The charge lever 7A is a charge member that is rotatably supported by the support shaft 8. The cam shaft 3 and the lever support shaft 8 are fixed to, for example, a mirror box in which the shutter device 101 is incorporated. In addition, the same code | symbol is attached | subjected and demonstrated to the structural member similar to 1st embodiment.

  The cam 4A includes a cam portion (FIG. 5) having a cam top portion 4a and a cam bottom portion 4b, and further includes a fitting hole member 4Ac that is a latch receiving member on the upper surface side. A tip end portion of a locking pin 11A of a charge lever 7A described later can be fitted into the fitting hole member 4Ac.

  The charge lever 7A includes a cam follower 7a that abuts and slides on the cam 4A, a drive pin 7b that abuts on the shutter lever 108 (FIG. 12) of the shutter device 101 (FIG. 12) and performs charge driving, and a slide hole member 7Ac. And is supported by the lever support shaft 8 so as to be rotatable. And it is urged | biased clockwise by the torsion spring 13 inserted in the lever support shaft 8. FIG. Accordingly, the cam follower 7a slides while contacting the cam portion on the outer periphery of the cam 4A as the cam 4A rotates clockwise. Note that both ends of the hook of the torsion spring 13 are suspended from the mirror box side stopper 9 and the charge lever 7A.

  A locking pin 11A, which is a locking member, is fitted in the slide hole 7Ad of the slide hole member 7Ac in a slidable state. A biasing spring 12A made of a compression spring is inserted into the locking pin 11A at the rear part (left side in FIG. 4) penetrating the slide hole 7Ad, and biases the locking pin 11A to the left side which is the retracting direction. Yes. Moreover, the front-end | tip part of 11 A of latching pins protrudes from slide hole member 7Ac, and step part 11Ad which regulates the movement to back is provided (FIG. 4).

  In a state in which the charge lever 7A does not receive an impact force (external force) around the lever support shaft 8, the locking pin 11A moves to the left (upper side in FIG. 4) and its distal end retreats from the end of the charge lever 7. Is held in the state. However, as will be described later, when the charge lever 7 suddenly stops rotating and receives an impact force around the lever support shaft 8, the tip of the locking pin 11A moves to the right (upper side in FIG. 4) due to inertial force. And it protrudes to the cam 4 side, and it will be in the state which can be inserted in insertion hole member 4Ac. This locking temporarily prevents the cam 4 from rotating clockwise.

  A charging operation of the charging mechanism 10A having the above-described configuration will be described with reference to FIG. Hereinafter, the charge mechanism 10A will be described as an operation when the shutter device 101 shown in FIG. 12 is driven to charge. However, when the charge spring 209 is driven to drive via the mirror device side lever 208 of the movable mirror device 201 shown in FIG. The operation of is the same.

  5A, which is a schematic diagram showing each operation state of the charging mechanism 10A, FIG. 5A shows a charging state in which the cam follower of the charge lever has reached the cam top position, and FIG. FIG. 5C shows a state in which the cam follower has reached the cam bottom, and FIG. 5C shows a state in which the locking pin is locked to the locking hole member and the rotation of the cam is restricted immediately after that. Indicates a state in which the locking pin is unlocked and a waiting state for the next charging operation.

  In the charging mechanism 10A, when a charging spring (not shown) for energizing the shutter film of the shutter device 101 is charged, the cam 4A is rotated clockwise together with the driven gear 104 by the drive motor 103 through the gear train. The When the cam follower 7a of the charge lever 7A reaches the cam top portion 4a from the cam bottom portion 4b of the cam 4A and pushes the shutter lever 108 to the left, the charging operation of the charge spring is completed (FIG. 5A). This timing is detected by the PI 111 and input to the camera control unit.

  Further, the cam 4A rotates by a predetermined rotation angle, and the cam follower 7a of the charge lever 7A comes into contact with the cam bottom portion 4b (FIG. 5B).

  When the cam follower 7a comes into contact (collision) with the cam bottom portion 4b, the locking pin 11A receives an impact force due to the kinetic energy of the charge lever 7A and protrudes to the right (cam side) due to the inertial force, and the tip portion of the cam 4A It fits in the hole part of insertion hole member 4Ac, and will be in a latching state. Thereafter, the rotation due to the clockwise inertia of the cam 4A is prevented, and the cam 4A is suddenly stopped to complete the charging operation (FIG. 5C). In addition, it is preferable that the size of the hole portion of the insertion hole member 4Ac of the cam 4A has a margin in the circumferential direction with respect to the distal end portion of the locking pin 11A in order to absorb the shift of the insertion timing.

  After the sudden stop of the cam 4A, the locking pin 11A moves backward in the left direction by the biasing force of the biasing spring 12A, and the locking pin tip and the fitting hole member 4Ac of the cam 4 are locked. It is released (FIG. 5 (D)). Therefore, it is possible to shift to the recharge operation that is continuously executed as it is.

  The operation on the shutter device 101 side or the movable mirror device 201 side accompanying the series of charging operations described above is the same as in the case of the first embodiment.

  As described above, the optical mechanism to which the charging mechanism 10A of the present embodiment is applied also has the same effect as that of the optical mechanism of the first embodiment, and the margin of the rotation angle of the cam bottom portion 4b of the cam 4A can be reduced. Thus, the rotation time required for one charge operation of the cam 4A can be reduced, and high-speed continuous shooting is possible. Further, a complicated mechanism for releasing the locked state is unnecessary, and a simple charge mechanism can be configured.

  Next, a modified example of the charging mechanism 10A according to the second embodiment described above with respect to the insertion hole member 4Ac disposed on the cam 4A will be described with reference to a perspective view of the charging mechanism to which the present modified example of FIG. 6 is applied.

  As shown in FIG. 6, the cam 4AA of the charging mechanism 10AA to which the present modification is applied is provided with two cam pins 4AAc that face each other in place of the insertion hole member 4Ac in the second mounting form.

  When the cam 4A is rotated by the charging operation in the charging mechanism 10AA and the cam follower 7a of the charge lever 7A comes into contact with the cam bottom portion 4b, the locking pin 11A receives an impact force and moves rightward (cam side) by the inertial force. The locking pin tip portion is fitted between the two cam pins 4AAc on the cam 4A side to be locked, the subsequent clockwise rotation of the cam 4AA is restricted, suddenly stopped, and charged. Is completed. The interval between the cam pins 4AAc of the cam 4AA is preferably set to have a margin in the circumferential direction with respect to the width of the distal end portion of the locking pin 11A in order to absorb a shift in insertion timing.

  According to the charging mechanism 10AA to which the present modification is applied, the structure on the cam 4AA side is further simplified.

  Next, a charge mechanism incorporated in the optical mechanism of the third embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a perspective view of a charge mechanism incorporated in the optical mechanism of the present embodiment. FIG. 8 is a schematic diagram showing each operation state of the charge mechanism.

  The charging mechanism 10B of this embodiment constitutes an optical mechanism together with the shutter device 101 of FIG. 12 described above or the movable mirror device 201 of FIG. Accordingly, the charge mechanism 1 of the present embodiment is incorporated in place of the charge mechanism 102 of FIG. 12 or the charge mechanism 202 of FIG. 13, and the optical mechanism of the present embodiment is configured. 11 and 12 are applied to components common to the shutter device 101 and the mirror device 201.

  The charging mechanism 10B is fixed on a driven gear 104 that is rotationally driven in one clockwise direction by a drive motor 103 via a gear train, and is a rotating member that is rotatably supported by the camshaft 3. It consists of a charge lever 7B as a charge member that is rotatably supported by the lever support shaft 8. The cam shaft 3 and the lever support shaft 8 are fixed to, for example, a mirror box in which the shutter device 101 is incorporated.

  The cam 4B includes a cam portion having a cam top portion 4a and a cam bottom portion 4b, and further includes a lever support pin 4Bd protruding to the upper surface side on the axis of the cam shaft 3 and a stopper pin 4Be. . A locking lever 11B, which is a locking member, is rotatably fitted in the lever support pin 4Bd. The locking lever 11B is provided with a claw at the tip, and is further biased counterclockwise by a torsion spring 12B inserted into the lever support pin 4Bd, and in a state where an impact force described later does not act, a stopper It is located at the retracted position in contact with the pin 4Be (FIG. 8A).

  The charge lever 7B is a cam follower 7a that contacts and slides on the cam 4B, a drive pin 7b that contacts the shutter lever 108 (FIG. 12) of the shutter device 101 (FIG. 12), for example, and a latch receiving member. And a mating pin 7Be, which is fitted into the lever support shaft 8 and is rotatably supported. A torsion spring 13 is inserted into the lever support shaft 8, and both ends of the hook of the torsion spring 13 are suspended on the mirror box side stopper 9 and the charge lever 7B, and urge the charge lever 7B clockwise. Accordingly, the cam follower 7a of the charge lever 7B slides while contacting the cam portion on the outer periphery of the cam 4 as the cam 4B rotates clockwise.

  When the cam 4B is not subjected to an impact force (external force) around the cam shaft 3 during continuous rotation or when stopped, the locking lever 11B rotates and moves counterclockwise relative to the cam 4B. Then, it is held at the retracted position in contact with the stopper pin 4Be (FIG. 8A). However, as will be described later, when the cam 4B stops suddenly and the locking lever 11B receives an impact force around the cam shaft 3 due to kinetic energy, the locking lever 11B is relatively moved relative to the cam 4B by the inertial force. Rotate clockwise. This rotational position is a position that can be locked with the engaging pin 7Be of the charge lever 7B. The locking lever 11B returns to the above-described retracted position from the position where the locking can be performed after the cam 4B is completely stopped.

  A charging operation of the charging mechanism 10B having the above-described configuration will be described with reference to FIG. Hereinafter, the charge mechanism 10B will be described as an operation when the shutter device 101 shown in FIG. 12 is driven to charge. However, the operation when the charge spring 209 of the movable mirror device 201 shown in FIG.

  FIG. 8A is a schematic diagram showing each operation state of the charge mechanism 10B. FIG. 8A shows a charge state in which the cam follower of the charge lever has reached the cam top position, and FIG. FIG. 8C shows a state where the cam follower has reached the cam bottom portion, and immediately after that, the locking lever rotates and locks with the cam pin. FIG. 8D shows a state where the cam stops. In this state, the locking lever is unlocked, and a waiting state for the next charging operation is shown.

  In the charging mechanism 10B, when a charging spring (not shown) for energizing the shutter film of the shutter device 101 is charged, the cam 4 is driven to rotate clockwise together with the driven gear 104 through the gear train by the driving motor 103. Is done. When the cam follower 7a of the charge lever 7B reaches the cam top portion 4a from the cam bottom portion 4b of the cam 4B and pushes the shutter lever 108 to the left, the charging operation of the charge spring is completed (FIG. 8A). This timing is detected by the PI 111 and input to the camera control unit.

  Further, the cam 4B rotates by a predetermined rotation angle, and the cam follower 7a of the charge lever 7B comes into contact with the cam bottom portion 4b (FIG. 8B).

  Due to the sudden stop of the drive motor 103, the locking lever 11B receives an impact force due to the kinetic energy at that time and rotates clockwise due to the inertial force, and the claw portion of the locking lever 11B engages with the engagement pin 7Be of the charge lever 7B. (FIG. 8C). The engagement restricts the subsequent clockwise rotation of the cam 4B, completes the stop and completes the charging operation.

  After completion of the series of charging operations described above, in the shutter device 101, the opening / closing control of the shutter film 110 is performed according to an instruction from a camera control unit (not shown), and the charge spring is released. When incorporated in the movable mirror device 201, the charge spring is released upon completion of the charging operation.

  After the sudden stop of the cam 4B, the locking lever 11B rotates backward counterclockwise by the urging force of the torsion spring 12B, and the locking between the locking lever claw and the engaging pin 7Be is released. (FIG. 8D). Therefore, it is possible to shift to the recharge operation that is continuously executed as it is.

  The operation on the shutter device 101 side or the movable mirror device 201 side accompanying the series of charging operations described above is the same as in the case of the first embodiment.

  As described above, the optical mechanism to which the charging mechanism 10B of the present embodiment is applied is configured to rotate the locking lever 11B by the inertial force received by the locking lever 11B during a sudden stop after the charging of the cam 4B is completed, thereby charging the lever 7B. The cam 4B can be suddenly stopped at the cam bottom phase by engaging with the engagement pin 7Be. Therefore, it is possible to reduce the margin of the rotation angle of the cam bottom portion 4b of the cam 4B, reduce the rotation time required for each charging operation of the cam 4B, and enable high-speed continuous shooting.

  In addition, after the sudden stop of the cam 4B at the cam bottom phase, the locking lever 11B moves back to the non-locking position with respect to the engagement pin 7Be using the biasing force of the torsion spring 12B. A complicated mechanism is not required, and a simple charge mechanism can be configured.

  In the charge mechanism 10B described above, the locking lever 11B is rotatably supported by a lever support pin 4Bd arranged on the center of the cam shaft 3. It is also possible to employ a structure in which the lever support pin is disposed at a position deviated from the center of the cam shaft 3, and in this case, the rotation of the cam 4B can be efficiently controlled.

  Next, a modified example of the locking lever 11B arranged on the cam 4A in the charging mechanism 10B of the above-described third embodiment will be described with reference to a perspective view of a charging mechanism to which this modified example of FIG. 9 is applied.

  In the charging mechanism 10BB to which this modification is applied, a locking lever 11BB provided with a protrusion 11BBa is applied to the locking lever 11B arranged on the cam 4B as shown in FIG. To do. On the other hand, an abutting member 7BBf that can abut against the protrusion 11BBa is disposed on the charge lever 7BB.

  When the charge lever 7BB contacts the cam bottom portion 4b of the cam 4B, the protrusion 11BBa of the locking lever 11BB is repelled by the contact member 7BBf and rotates clockwise. By the rotation, the claw portion of the locking lever 11BB is engaged with the engaging pin 7Be of the charge lever 7BB, and the clockwise rotation of the cam 4B can be restricted and suddenly stopped.

  According to the charging mechanism 10BB to which this modification is applied, a reliable pivoting operation of the locking lever 11BB is obtained particularly when the cam 4B comes into contact with the cam bottom portion 4b, and the cam 4B is reliably stopped at the cam bottom phase. be able to.

  Next, a charge mechanism incorporated in the optical mechanism of the fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 10 is a perspective view of a charging mechanism incorporated in the optical mechanism of the present embodiment. FIG. 11 is a cross-sectional view showing each operation state of the charge mechanism.

  The charge mechanism 10C of this embodiment shown in FIG. 10 constitutes an optical mechanism together with the shutter device 101 of FIG. 12 or the movable mirror device 201 of FIG.

  The charging mechanism 10C is fixed on a driven gear 104C that is rotationally driven in one clockwise direction by a drive motor 103 via a gear train, and is a cam 4C as a rotating member that is rotatably supported by the camshaft 3. The charge lever 7C is a charge member that is rotatably supported by the lever support shaft 8. The cam shaft 3 and the lever support shaft 8 are fixed to, for example, a mirror box in which the shutter device 101 is incorporated. In addition, the same code | symbol is attached | subjected and demonstrated to the structural member similar to 1st embodiment.

  The driven gear 104C is an upper surface portion of the gear body, and includes an engagement hole 104Ca that is a latch receiving portion at a position near the cam bottom portion 4Cb of the cam 4C described later.

  The cam 4C is provided with a cam portion having a cam top portion 4a and a cam bottom portion 4Cb. The cam bottom portion 4Cb is formed by a cam bottom surface formed of a conical inclined surface inclined toward the cam shaft side in the downward direction (driven gear side). Is done.

  The charge lever 7C includes a cam follower member 11C and, for example, a drive pin 7b that abuts on the shutter lever 108 (FIG. 12) of the shutter device 101 and performs charge driving, and can be inserted into the lever support shaft 8 and rotated. It is supported by. Further, it is urged clockwise by a torsion spring 13 inserted into the lever support shaft 8.

  The cam follower member 11C is fixed to the shaft member 11Cc. The cam follower portion 11Ca is on the lower surface side of the charge lever 7C and is in sliding contact with the cam surface of the cam 4C. The cam follower portion 11C forms a locking portion having a smaller diameter than the cam follower portion 11Ca. And a stop pin portion 11Cb. The shaft member 11Cc is supported so as to be slidable in a direction parallel to the lever support shaft 8 with respect to the charge lever 7C, and is urged upward by an urging spring 12C.

  When the cam follower portion 11Ca of the charge lever 7C slides on the cam surface of the cam 4C, the cam follower member 11C is positioned above the charge lever 7C by the biasing force of the biasing spring 12C. When the cam follower portion 11Ca of the charge lever 7C suddenly moves while being in sliding contact from the cam top portion 4a toward the cam bottom portion 4Cb and comes into contact with the cam bottom portion 4Cb having a downward slope, the cam follower member 11C is subjected to a downward impact. The force (kinetic energy) is received and moved downward by the inertial force, and the locking pin portion 11 </ b> Cb is temporarily fitted in the engagement hole 104 </ b> Ca of the driven gear 104. As a result of this fitting, rotation restricting force acts on the cam 4C, and the cam 4C stops suddenly. After the cam 4C stops, the cam follower member 11C moves upward by the urging force of the urging spring 12C, and the engagement of the locking pin portion 11Cb is released.

  A charging operation of the charging mechanism 10C having the above-described configuration will be described with reference to FIG. Hereinafter, the charge mechanism 10C will be described as an operation when the shutter device 101 shown in FIG. 12 is driven to charge. However, when the charge spring 209 is driven to charge via the mirror device side lever 208 of the movable mirror device 201 shown in FIG. The operation of is the same.

  11A and 11B, which are cross-sectional views showing the operating states of the charging mechanism 10C, FIG. 11A shows a charging state in which the cam follower member of the charge lever has reached the cam top position, and FIG. 11C shows a state in which the cam follower member has reached the cam bottom portion. FIG. 11C shows a state in which the locking pin of the cam follower member is immediately inserted into the engagement hole of the driven gear, and the rotation of the cam is restricted. FIG. 11D shows a state in which the locking pin is unlocked and a waiting state for the next charging operation.

  In the charging mechanism 10C, when charging a shutter spring biasing charge spring (not shown) of the shutter device 101, the cam 4C is rotated clockwise together with the driven gear 104C by the drive motor 103 through the gear train. . When the cam follower member 11C of the charge lever 7C reaches the cam top portion 4a of the cam 4C and pushes the shutter lever 108 to the left, the charging operation of the charge spring is completed (FIG. 11A). This timing is detected by the PI 111 and input to the camera control unit.

  Further, the cam 4C rotates by a predetermined rotation angle, and the cam follower portion 11Ca of the cam follower member 11C comes into contact with the cam bottom portion 4Cb (FIG. 11B). Here, the drive motor 103 is braked. The cam rotation position at this time is detected by a motor rotation detection encoder (not shown) and input to the camera control unit.

  When the cam follower portion 11Ca abuts (collises) with the cam bottom portion 4Cb, the cam follower member 11C moves by receiving a downward impact force on the slope portion of the cam bottom portion 4Cb by the kinetic energy of the charge lever 7C, and the locking pin portion 11Cb is inserted into the insertion hole 104Ca of the driven gear 104C to be in a locked state. Thereafter, the clockwise rotation of the cam 4C is restricted, and the cam 4C is suddenly stopped to complete the charging operation (FIG. 11C). In addition, it is preferable that the size of the insertion hole 104Ca of the driven gear 104C has a margin with respect to the locking pin 11Cb in order to absorb the displacement of the insertion timing. Alternatively, the insertion hole 104Ca and the locking pin 11Cb are preferably tapered.

  After the sudden stop of the cam 4C, the cam follower member 11C is moved upward by the urging force of the urging spring 12C, and the engagement state between the locking pin portion 11Cb and the insertion hole portion 104Ca of the driven gear 104C is released. (FIG. 11D). Therefore, it is possible to shift to the recharge operation that is continuously executed as it is.

  The operation on the shutter device 101 side or the movable mirror device 201 side accompanying the series of charging operations described above is the same as in the case of the first embodiment.

  As described above, the optical mechanism to which the charging mechanism 10C of this embodiment is applied also has the same effect as that of the optical mechanism of the first embodiment, and the margin of the rotation angle of the cam bottom portion 4Cb of the cam 4C can be reduced. Thus, the rotation time required for one charging operation of the cam 4C is reduced, and high-speed continuous shooting is possible. Further, after the cam 4C is stopped, the cam follower member 11C is moved upward by the urging force of the urging spring 12C, and the locking state of the locking pin portion 11Cb is released, so that a complicated mechanism for releasing the locking is provided. A simple charging mechanism can be configured without the need for a unit.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  As described above, the optical mechanism of the present invention has a simple structure, a simple control operation, and can be used as an optical mechanism that can stop the rotating member with high accuracy.

It is a perspective view of the charge mechanism integrated in the optical mechanism which is 1st embodiment of this invention. FIG. 2A is a schematic diagram showing each operation state of the charge mechanism, in which FIG. 2A shows a charge state in which the cam follower of the charge lever has reached the cam top position, and FIG. 2C shows a state where the cam bottom has been reached. FIG. 2C shows a state where the locking lever immediately starts rotating due to an impact force. FIG. 2D shows a state where the locking lever is engaged with the locking pin. FIG. 2E shows a state in which the cam is stopped and the locking lever is released from the locking state, and shows a waiting state for the next charging operation. It is a perspective view of the charge mechanism integrated in the optical mechanism which is 2nd embodiment of this invention. FIG. 4 is an enlarged plan view around a charge lever locking pin of the charge mechanism. FIG. 5 (A) shows a charge state in which the cam follower of the charge lever has reached the cam top position, and FIG. 5 (B) shows the operation state of the cam follower at the cam bottom portion. FIG. 5C shows a state in which the locking pin is locked in the locking hole member and the rotation of the cam is restricted immediately after that, and FIG. 5D shows the locking pin. This shows a state in which the lock is released and shows a waiting state for the next charge operation. FIG. 4 is a perspective view of a charging mechanism in which a modification of the cam insertion hole member in the optical system mechanism of FIG. 3 is applied. It is a perspective view of the charge mechanism integrated in the optical mechanism which is 3rd embodiment of this invention. FIG. 8A is a schematic diagram showing each operation state of the charge mechanism, and FIG. 8A shows a charge state in which the cam follower of the charge lever has reached the cam top position, and FIG. 8B shows FIG. FIG. 8C shows a state where the cam follower has reached the cam bottom after the state of FIG. 8, and FIG. In this state, the cam is stopped and the locking lever is unlocked, and a waiting state for the next charging operation is shown. FIG. 8 is a perspective view of a charging mechanism to which a modification of a locking lever arranged on a cam of the optical mechanism of FIG. 7 is applied. It is a perspective view of the charge mechanism integrated in the optical mechanism which is the 4th embodiment of this invention. FIG. 11A is a cross-sectional view showing each operation state of the charge mechanism of FIG. 10, and FIG. 11A shows a charge state in which the cam follower member of the charge lever has reached the cam top position, and FIG. FIG. 11C shows a state in which the cam follower member has reached the cam bottom, and immediately after that, the locking pin of the cam follower member is fitted into the engagement hole of the driven gear, and the rotation of the cam is restricted. FIG. 11D shows a state in which the locking pin is unlocked and shows a waiting state for the next charging operation. It is a perspective view which shows an example of the optical mechanism which consists of the conventional shutter device and charge mechanism. It is a perspective view which shows an example of the optical apparatus which consists of the conventional movable mirror apparatus and a charge mechanism.

Explanation of symbols

4, 4A, 4AA, 4B, 4C
... Cam (rotating member)
7, 7A, 7B, 7BB, 7C
... Charge lever (charge member)
11, 11B, 11BB
... Locking lever (locking member)
11A: Locking pin (locking member)
11Cb ... Locking pin (locking member)
13 ... Torsion spring (first spring)
209 ... Charge spring (second spring)
110 ... Shutter film (mechanical shutter)
211 ... movable mirror P1 ... entry position (first position)
P2: Retraction position (second position)

Claims (5)

A charge member that is biased by a first spring, and is movable back and forth between a first position that enters the optical path of the imaging optical system and a second position that retreats from the optical path of the imaging optical system A charge member for charging a second spring for energizing a mirror or a mechanical shutter for adjusting an exposure time of the image sensor;
A rotating member that is a member that rotates and is a member that charges and releases the first spring;
The rotation of the rotating member or the charging member is performed by the kinetic energy of the charging member or the rotating member generated when the charge of the first spring is released. A locking member that suppresses inertial rotation of the member;
An optical mechanism comprising: The locking member is biased in a direction opposite to the direction in which the locking member operates. After the locking is performed, the locking is released by the biasing. The optical mechanism according to claim 1. The optical mechanism according to claim 1, wherein the kinetic energy is kinetic energy generated by a change in an operation speed of the charge member when the charge of the first spring is released. The optical mechanism according to claim 1, wherein the kinetic energy is kinetic energy generated by a change in a rotation speed of the rotating member when the charge of the first spring is released. The kinetic energy is collision energy in which a part of the charge member collides with a part of the rotating member when the charge of the first spring is released. Optical mechanism.

Images