JP2016095450A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable photography in which a mirror and a shutter are driven using one motor and photography in which a mirror-up state is maintained and only the shutter is driven.SOLUTION: A mirror mechanism 59 comprises a driving member 31 which can engages a cam member 33 driven a motor to rotate and reverse. The driving member 31 has a follower 31c engaged with and held by a cam surface 50a with the mirror 30 down, and also has the follower 31c engaged with and held by a mirror surface 50b with the mirror 30 up. The cam member 33 repeatedly acts in the rotating operation to move the follower 31c along the cam surface 50a, the cam surface 50b, and a movable cam member 52 and then to return it to the cam surface 50a, and also acts in the reversing operation to guide the follower 31c from the cam surface 50a to the cam surface 50b along the movable cam member 52 and move it along the cam surface 50b and also to push up the movable cam member 52 by the follower 31c against energizing force of an energizing member 53, so that the follower 31c continues to move along the cam surface 50b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an imaging apparatus such as a single-lens reflex camera including a mirror mechanism and a shutter mechanism.

  An imaging apparatus such as a single-lens reflex camera has a mirror mechanism that has a mirror that enters a photographing optical path during viewfinder observation and retracts from the photographing optical path during photographing. In many cases, the exposure amount of the imaging element during photographing is adjusted. A focal plane shutter is used as the shutter mechanism.

  As a conventional imaging apparatus of this type, a technique has been proposed in which two mechanisms, a mirror mechanism and a shutter mechanism, are independently driven and controlled using separate motors (Patent Document 1).

  In this proposal, in live view shooting where shooting is performed while displaying a through image from an image sensor on a display device, mirror up is performed by driving the shutter mechanism while keeping the mirror mechanism retracted from the shooting optical path. Continuous shooting is possible.

  For this reason, mirror-up continuous shooting eliminates the need to drive a mirror mechanism that generates noise and vibration during driving, and can be used for shooting in places and subjects where quiet shooting sound is required, and for the amount of blur in the shot image. It is effective for shooting that you want to reduce as much as possible.

  In addition, an imaging apparatus that drives and controls two mechanisms of a mirror mechanism and a shutter mechanism with a single motor has been proposed (Patent Document 2).

JP 2011-095687 A JP 2011-048194 A

  In Patent Document 1, the two mechanisms are independently driven and controlled using two motors, which hinders cost reduction, weight reduction, and size reduction of the imaging apparatus. On the other hand, in Patent Document 2, since the two mechanisms are driven and controlled using a single motor, the imaging apparatus can be reduced in cost, weight, and size as compared with the case where two motors are used. . However, in Patent Document 2, the mirror mechanism and the shutter mechanism cannot be driven and controlled independently, and mirror-up continuous shooting with less sound and vibration cannot be performed.

  Therefore, the present invention provides an imaging apparatus that enables shooting that controls driving of the mirror mechanism and the shutter mechanism using one motor and shooting that controls only the shutter mechanism while maintaining the mirror-up state. With the goal.

  In order to achieve the above object, the imaging apparatus of the present invention adjusts the exposure amount of the imaging element, a mirror that enters the imaging optical path during viewfinder observation and retracts from the imaging optical path during imaging, a mirror mechanism that drives the mirror, and the like. A shutter mechanism that drives the shutter, and a motor that is a drive source of the mirror mechanism and the shutter mechanism, wherein the shutter mechanism is moved in the forward and reverse directions by the motor. A shutter drive member that performs the same shutter drive operation regardless of which is driven to rotate, and the mirror mechanism has a cam follower, the mirror drive member that drives the mirror, and the mirror enters the imaging optical path. In such a state, the mirror follower has a cam portion with which the cam follower abuts and is driven to rotate forward or backward by the motor. A mirror cam member, one end of which is formed continuously with the cam portion, and the other end of which is movable, a biasing portion that biases the movable cam portion, and the mirror cam A space where the cam follower enters when the member is rotationally driven in the reverse direction, and the mirror is retracted from the photographing optical path, and the mirror cam member is not in contact with the cam portion. Is rotated in the positive direction, the cam follower slides on the movable cam part until the mirror enters the photographing optical path from the state where the mirror is retracted from the photographing optical path, When the cam follower is in contact with the cam portion, the mirror is retracted from the photographing optical path, and the mirror cam member is in contact with the cam portion from the state in which the cam follower is not in contact with the cam portion. When the cam follower is driven to rotate in the direction, the cam follower enters the space, moves the movable cam portion against the biasing force of the biasing portion, the mirror retracts from the photographing optical path, and the cam follower A state in which the cam portion is not in contact with the cam portion is maintained.

  According to the present invention, it is possible to perform shooting for driving and controlling the mirror mechanism and the shutter mechanism and shooting for driving and controlling only the shutter mechanism while maintaining the mirror-up state using one motor. As a result, it is possible to perform mirror-up shooting with less sound and vibration while reducing the cost, weight, and size of the imaging device.

(A) is the perspective view which looked at the digital single-lens reflex camera which is an example of Embodiment of the imaging device of this invention from the front side (object side), (b) is the digital single-lens reflex camera shown to (a) from the back side. FIG. It is a block diagram which shows the electric constitution of the digital single-lens reflex camera shown in FIG. It is the figure which looked at the shutter mechanism from the front side. (A) is the figure which looked at the mirror mechanism from the front side, (b) is the A section enlarged view of (a). It is a figure explaining operation | movement of a mirror mechanism when a mirror cam gear rotates in the clockwise direction (arrow D direction) of a figure, when a quick return mirror is in a mirror down state. It is a figure explaining operation | movement of a mirror mechanism when a mirror cam gear rotates in the anticlockwise direction (arrow E direction) of a figure, when a quick return mirror is in a mirror down state. It is a figure which shows operation | movement of the shutter mechanism at the time of finder imaging | photography. It is a figure which shows operation | movement of the shutter mechanism at the time of live view imaging | photography. It is a flowchart figure which shows the drive sequence of the shutter mechanism at the time of finder imaging | photography by a system control part, and a mirror mechanism. It is a flowchart figure which shows the drive sequence of the shutter mechanism by the system control part at the time of switching to live view imaging | photography mode, and a mirror mechanism. It is a flowchart figure which shows the drive sequence of the shutter mechanism by the system control part at the time of performing electronic front curtain photography in a live view imaging state, and a mirror mechanism. It is a flowchart figure which shows the drive sequence of the shutter mechanism by the system control part at the time of imaging | photography using a mechanical front curtain in a live view imaging state. It is a flowchart figure which shows the drive sequence of the shutter mechanism by the system control part at the time of completion | finish of live view imaging | photography mode, and a mirror mechanism.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a perspective view of a digital single-lens reflex camera as an example of an embodiment of an imaging apparatus of the present invention viewed from the front side (subject side), and FIG. 1B is a digital single lens shown in FIG. It is the perspective view which looked at the reflex camera from the back side.

  As shown in FIG. 1A, the digital single-lens reflex camera according to the present embodiment has a replaceable lens barrel 2 detachably mounted on the front side of the camera body 1. A release button 3 and a mode dial 5 are provided.

  The release button 3 is turned on by a half-press operation or the like by the user, and instructs the system control unit 14 (see FIG. 2) described later to start photometry or AF (autofocus). The release button 3 is turned on by a user's full pressing operation or the like, and instructs the system control unit 14 to start photographing (exposure). In the mode dial 5, a switching operation such as a live view shooting mode and an electronic front curtain shooting mode, which will be described later, is performed.

  As shown in FIG. 1B, an image display unit 6 such as an LCD, an optical finder 7, various operation button groups, and the like are provided on the back side of the camera body 1. A shutter mechanism 4 is provided inside the camera body 1. In this embodiment, a focal plane shutter is used as the shutter mechanism 4. The shutter mechanism 4 opens and closes in response to the switch SW 2 being turned on. 2) is controlled.

  The shutter mechanism 4 is opened before the switch SW2 is turned on (before photographing), whereby a subject image that has passed through the photographing optical system of the lens barrel 2 is imaged on the image sensor 10 and subjected to photoelectric conversion, A through image is generated. By displaying the through image on the image display unit 6, the user can perform live view shooting while observing the subject displayed on the image display unit 6.

  FIG. 2 is a block diagram showing an electrical configuration of the digital single-lens reflex camera shown in FIG. In FIG. 2, the lens barrel 2 has a photographing optical system including an optical lens group 8 and a diaphragm 9. The image sensor 10 is constituted by a CCD sensor, a CMOS sensor, or the like, and photoelectrically converts a subject image formed through the photographing optical system. The A / D converter 11 converts the analog image signal output from the image sensor 10 into a digital image signal. The timing generation circuit 12 is controlled by the memory control unit 13 and the system control unit 14 and supplies a clock signal and a control signal to the image sensor 10 and the A / D conversion unit 11.

  The image processing unit 15 performs image processing such as pixel interpolation processing and color conversion processing on the digital imaging signal from the A / D conversion unit 11 or the memory control unit 13 to generate image data. The image processing unit 15 performs predetermined calculation processing using the digital imaging signal output from the A / D conversion unit 11, and based on the obtained calculation result, a TTL (through-the-lens) AWB (automatic) Perform white balance control.

  The memory control unit 13 controls the A / D conversion unit 11, the timing generation circuit 12, the image processing unit 15, the image display memory 16, the display control unit 17, the memory 18, and the compression / decompression unit 19. Image data generated by the image processing unit 15 based on the digital imaging signal output from the A / D conversion unit 11 or the memory control unit 13 is written to the image display memory 16 or the memory 18 via the memory control unit 13. It is.

  The memory 18 is a memory for storing image data generated by photographing. The compression / decompression unit 19 compresses / decompresses the image data read from the memory 18 according to a predetermined image compression method (for example, applied discrete cosine transform). The compression / decompression unit 19 reads image data stored in the memory 18, performs compression processing or decompression processing, writes the processed image data in the memory 18, and records the processed image data in the recording medium 20. Is done. The recording medium 20 is configured by a nonvolatile memory such as a flash memory, and can be attached to and detached from the camera body 1.

  The image data read from the recording medium 20 to the memory 18 can be written into the image display memory 16 via the image processing unit 15 or the memory control unit 13 and displayed on the image display unit 6 by the display control unit 17.

  The system control unit 14 controls the entire camera. The system control unit 14 includes a microcomputer unit including a CPU, and executes a control program stored in the memory 18. The system control unit 14 controls the memory control unit 13, the image processing unit 15, the shutter control unit 21, the motor control unit 22, the aperture control unit 23, the AF control unit 24, the flash control unit 26, and the power supply control unit 28.

  The memory 27 stores constants, variables, control programs, and the like for the operation of the system control unit 14. Examples of the control program include a program for performing an imaging process, a program for performing an image process, a program for recording the created image file data on the recording medium 20, and a program for reading the image file data from the recording medium 20.

  The shutter control unit 21 controls energization of the leading blade electromagnet 39 and the trailing blade electromagnet 40 in accordance with a shutter control signal from the system control unit 14. The front blade electromagnet 39 holds a front blade group 66 (see FIG. 3), which will be described later, of the shutter mechanism 4 in a charged state using electromagnetic force generated by energizing a front blade coil (not shown). The rear blade electromagnet 40 holds the rear blade group 67 (see FIG. 3) of the shutter mechanism 4 in a charged state using electromagnetic force generated by energizing a rear blade coil (not shown).

  The drive of the motor 41 is controlled by the motor control unit 22 that has received a control signal from the system control unit 14. The system control unit 14 controls the motor 41 via the motor control unit 22 according to the operation of the release button 3 to drive the shutter mechanism 4 and the mirror mechanism 59 (see FIG. 4). The motor 41 is a drive source for the mirror mechanism and the shutter mechanism.

  The aperture controller 23 controls the aperture 9 to adjust the amount of light that passes through the imaging optical system and reaches the image sensor 10. The AF control unit 24 performs AF control by driving the focus lenses constituting the optical lens group 8 in the optical axis direction in accordance with an AF control signal (focus lens movement amount information) from the system control unit 14. The flash control unit 26 controls the flash 25 that emits light to illuminate the subject.

  The power controller 28 determines whether or not a battery as a power source is attached, the type of battery, the remaining battery level, and the like. The power supply control unit 28 supplies a necessary voltage to each part of the camera body 1 and the lens barrel 2 for a necessary period according to the determination result and an instruction from the system control unit 14.

  FIG. 3 is a view of the shutter mechanism 4 as seen from the front side. As shown in FIG. 3, in the shutter mechanism 4, each component constituting the driving mechanism for the leading blade group 66 and the trailing blade group 67 is attached to a shutter base plate (not shown).

  The shutter biasing spring 68a biases the leading blade drive lever 34 that drives the leading blade group 66 in the traveling direction, and the shutter biasing spring 68b moves the trailing blade drive lever 35 that drives the trailing blade group 67 in the traveling direction. Energize. Here, the leading blade driving lever 34 corresponds to an example of a leading blade driving member of the present invention, and the trailing blade driving lever 35 corresponds to an example of a trailing blade driving member of the present invention. The shutter urging spring 68a corresponds to an example of a leading blade urging member of the present invention, and the shutter urging spring 68b corresponds to an example of a trailing blade urging member of the present invention.

  The leading blade driving lever 34 and the trailing blade driving lever 35 are rotatably provided around the leading blade shaft 34a and the trailing blade shaft 35a, respectively. The leading blade charge follower 34 b provided on the leading blade drive lever 34 is in contact with the cam surface formed at the tip of the leading blade cam lever 60. The trailing blade charge follower 35 b provided on the trailing blade drive lever 35 is in contact with the cam surface formed at the tip of the trailing blade cam lever 61.

  A link lever 63 that transmits driving force is provided between the leading blade cam lever 60 and the gear 62. A four-bar linkage mechanism 69 is configured by a base (not shown), the gear 62, the link lever 63, and the leading blade cam lever 60, and the rotational motion of the gear 62 in the normal or reverse direction is converted into the swinging motion of the leading blade cam lever 60. The rear blade cam lever 61 is provided with a charge pin 61b and a release pin 61a for receiving a driving force from the swinging front blade cam lever 60. Here, the gear 62, the link lever 63, the leading blade cam lever 60, and the trailing blade cam lever 61 correspond to an example of a shutter driving member that performs a shutter driving operation. The shutter drive member performs the same shutter drive operation regardless of whether the shutter drive member is driven to rotate in the forward direction or the reverse direction by the motor. The charge pin 61b corresponds to an example of the first driven part of the present invention, and the release pin 61a corresponds to an example of the second driven part of the present invention.

  A leading blade armature 37 and a trailing blade armature 38 are attached to the leading blade driving lever 34 and the trailing blade driving lever 35, respectively. The leading blade armature 37 and the trailing blade armature 38 are respectively the leading blade electromagnet 39 and the trailing blade electromagnet 40 by electromagnetic force generated by energizing the leading blade electromagnet 39 and the trailing blade electromagnet 40 held on the MG ground plate (not shown). Is adsorbed and retained. The leading blade electromagnet 39 and the leading blade armature 37 correspond to an example of the leading blade electromagnetic holding means of the present invention, and the trailing blade electromagnet 40 and the trailing blade armature 38 correspond to an example of the trailing blade electromagnetic holding means of the present invention.

  The mirror cam gear 33 is rotationally driven in the forward and reverse directions by the motor 41 and is attached to a shutter base plate (not shown) so as to be rotatable about a mirror cam gear shaft provided in parallel with the photographing optical axis. Mesh directly. The mirror cam gear 33 and the gear 62 have the same number of teeth and need to be engaged with each other at a phase capable of executing a drive sequence described later.

  The driving force of the motor 41 having an output shaft parallel to the photographing optical axis rotates the mirror cam gear 33 and the gear 62 via the reduction gear train 42, respectively. As a result, the rotation of the mirror mechanism 59 (advance and retreat with respect to the photographing optical path) and the charging operation and the charge releasing operation of the leading blade driving lever 34 and trailing blade driving lever 35 of the shutter mechanism 4 are performed.

  Next, the mirror mechanism 59 will be described with reference to FIGS. 4A is a view of the mirror mechanism 59 as viewed from the front side, and FIG. 4B is an enlarged view of a portion A in FIG. 4A.

  As shown in FIG. 4A, the mirror mechanism 59 includes a quick return mirror 30, a mirror drive lever 31, a mirror down spring 32, a mirror cam gear 33, and a mirror up spring 36.

  The quick return mirror 30 is provided in the mirror box so as to be rotatable around a rotation shaft 30a. The quick return mirror 30 is rotated in the down direction when observing the viewfinder and enters the photographing optical path. Retreat from the light path.

  The mirror drive lever 31 is provided so as to be rotatable about a rotation shaft 31a, and includes a convex portion 31b and a cam follower 31c. The convex portion 31b can contact the shaft portion 30b of the quick return mirror 30, and the cam follower 31c can engage with a cam surface of a cam portion 50a and an inner diameter portion 50b (see FIG. 4) described later of the mirror cam gear 33. is there. Note that the shaft portion 30b of the quick return mirror 30 is disposed below the photographing optical axis at a mirror down position where the quick return mirror 30 enters the photographing optical path. The mirror drive lever 31 corresponds to an example of the mirror drive member of the present invention.

  The quick return mirror 30 is urged by a mirror down spring 32 so as to follow the turning operation of the mirror drive lever 31, and the mirror drive lever 31 retracts the quick return mirror 30 from the photographing optical path by the mirror up spring 36. Is biased in the direction.

  As shown in FIGS. 4A and 4B, the mirror cam gear 33 includes a cam gear body 50, a movable cam member 52, and a movable cam biasing spring 53. Here, the mirror cam gear 33 corresponds to an example of a mirror cam member of the present invention, and the movable cam biasing spring 53 corresponds to an example of a biasing portion of the present invention.

  The cam gear main body 50 is rotatably provided, an approximately arc-shaped cam portion 50a is provided on the outer peripheral side, and an inner diameter portion 50b having a smaller diameter than the cam portion 50a is provided at the center portion. The inner diameter portion 50b is provided along the 360 ° range indicated by the broken line B in FIG. 4B, that is, along the entire circumference in the rotational direction, and the cam portion 50a is indicated by the broken line C in FIG. 4B. It is provided in a substantially arc shape in a range exceeding 0 ° and less than 360 ° (in this embodiment, a range of about 120 °).

  A space 50d into which the cam follower 31c of the mirror drive lever 31 can enter is provided between the inner diameter portion 50b and the cam portion 50a. Here, the cam portion 50a corresponds to an example of the cam portion of the present invention, and the space 50d corresponds to an example of a space into which the cam follower of the present invention enters.

  The movable cam member 52 is formed in a substantially arc shape. One end portion of the movable cam member 52 is rotatably supported with respect to a shaft 50 c provided at the circumferential end portion of the cam portion 50 a of the cam gear main body 50, and the movable cam biasing spring 53 supports the movable cam member 53. The other end portion of the member 52 is biased in a direction approaching the inner diameter portion 50b. One end of the movable cam member 52 is formed continuously with the cam portion 50 a of the cam gear body 50. The other end of the movable cam member 52 is formed to be movable. The movable cam member 52 corresponds to an example of a movable cam portion.

  The shaft 50c is disposed at a position where the cam follower 31c can move 360 ° around the inner diameter portion 50b when the movable cam member 52 is rotated. Further, as described later, when the cam follower 31c slides on the movable cam member 52 and moves from the inner diameter portion 50b to the cam surface (outer peripheral surface) of the cam portion 50a, the rotation of the movable cam member 52 is restricted. Is desirable.

  The mirror down spring 32 urges the quick return mirror 30 in the down direction to enter the photographing optical path. When the quick return mirror 30 is in the mirror down position where it enters the imaging optical path, the cam follower 31c of the mirror drive lever 31 is movably in contact with the outer peripheral surface (cam surface) of the cam portion 50a.

  The mirror up spring 36 urges the mirror drive lever 31 in the clockwise direction of FIG. Due to this urging force, the shaft portion 30b of the quick return mirror 30 is pushed up by the convex portion 31b of the mirror drive lever 31, and the quick return mirror 30 rotates in the up direction to retract from the photographing optical path. At this time, the cam follower 31c of the mirror drive lever 31 is located inside the cam portion 50a. At this time, the cam follower 31c does not contact the inner diameter portion 50b. Therefore, in this state, the mirror drive lever 31 pushes up the quick return mirror 30 by the biasing force of the mirror up spring 36. While the mirror drive lever 31 pushes up the quick return mirror 30, the quick return mirror 30 is held at the mirror up position.

  FIG. 5 is a diagram for explaining the operation of the mirror mechanism 59 when the mirror cam gear 33 rotates in the clockwise direction (arrow D direction) in FIG. 5 when the quick return mirror 30 is in the mirror down state.

  FIG. 5A is a diagram showing a state when the quick return mirror 30 is in the mirror down position. At this time, the cam follower 31c is in contact with the cam surface of the cam portion 50a. When the mirror cam gear 33 rotates in the clockwise direction (arrow D direction) in FIG. 5 from this state, the cam follower 31c slides on the cam surface of the cam portion 50a.

  When the mirror cam gear 33 further rotates in the clockwise direction (arrow D direction) in FIG. 5 from the state of FIG. 5A, the cam follower 31c is disengaged from the cam surface of the cam portion 50a, and the mirror drive lever 31 is attached with the mirror up spring 36. It rotates in the clockwise direction in the figure by the force.

  As the mirror drive lever 31 rotates, the shaft portion 30b of the quick return mirror 30 is pushed up by the convex portion 31b of the mirror drive lever 31, and the quick return mirror 30 is retracted from the photographing optical path as shown in FIG. Become up position. At this time, the cam follower 31c does not contact the inner diameter portion 50b. Therefore, in this state, the mirror drive lever 31 pushes up the quick return mirror 30 by the biasing force of the mirror up spring 36. While the mirror drive lever 31 pushes up the quick return mirror 30, the quick return mirror 30 is held at the mirror up position.

  When the mirror cam gear 33 further rotates in the clockwise direction (arrow D direction) in FIG. 5 from the state of FIG. 5B, the cam follower 31c has a substantially arc-shaped movable cam member 52 as shown in FIG. 5C. It contacts the outer peripheral side and slides on the outer peripheral surface of the movable cam member 52.

  When the mirror cam gear 33 further rotates in the clockwise direction (arrow D direction) in FIG. 5 from the state of FIG. 5C, the cam follower 31c slides on the outer peripheral side of the movable cam member 52 as shown in FIG. From the moving state, the cam surface of the cam portion 50a is slid. Thereby, the mirror drive lever 31 is rotated counterclockwise in FIG. 5 against the urging force of the mirror up spring 36, and the quick return mirror 30 is rotated in the mirror down direction. Then, when the mirror cam gear 33 further rotates in the clockwise direction (arrow D direction) in FIG. 5 from the state shown in FIG. 5D, the state returns to the state shown in FIG.

  FIG. 6 is a diagram for explaining the operation of the mirror mechanism 59 when the mirror cam gear 33 rotates counterclockwise (arrow E direction) in FIG. 6 when the quick return mirror 30 is in the mirror down state.

  FIG. 6A is a diagram showing a state when the quick return mirror 30 is in the mirror down position. At this time, the cam follower 31c is in contact with the cam surface of the cam portion 50a. When the mirror cam gear 33 rotates counterclockwise (arrow E direction) in FIG. 6 from this state, the cam follower 31c slides on the cam surface of the cam portion 50a.

  Thereafter, when the mirror cam gear 33 further rotates counterclockwise in FIG. 6 (arrow E direction), the cam follower 31c is detached from the cam surface of the cam portion 50a, and a substantially arc-shaped movable cam member is applied by the urging force of the mirror up spring 36. The outer peripheral surface of 52 is slid. As a result, the mirror drive lever 31 is rotated in the clockwise direction in FIG. 6 by the urging force of the mirror up spring 36.

  The shaft portion 30b of the quick return mirror 30 is pushed up by the convex portion 31b of the mirror drive lever 31 by the rotation of the mirror drive lever 31, and the quick return mirror 30 is retracted from the photographing optical path as shown in FIG. 6B. Become up position. At this time, the mirror drive lever 31 pushes up the quick return mirror 30 by the biasing force of the mirror up spring 36. While the mirror drive lever 31 pushes up the quick return mirror 30, the quick return mirror 30 is held at the mirror up position. When the mirror cam gear 33 further rotates counterclockwise (arrow E direction) in FIG. 6 from the state of FIG. 6B, the cam follower 31c enters the space 50d formed between the cam portion 50a and the inner diameter portion 50b. . Thereafter, the cam follower 31c moves in the space 50d and comes into contact with the inner peripheral surface of the movable cam member 52 as shown in FIG.

  When the mirror cam gear 33 further rotates counterclockwise (arrow E direction) in FIG. 6 from the state of FIG. 6C, the cam follower 31c is attached with the movable cam biasing spring 53 as shown in FIG. 6D. The movable cam member 52 is pushed up against the force. Accordingly, the movable cam member 52 rotates so that the other end portion of the movable cam member 52 is separated from the inner diameter portion 50b. When the mirror cam gear 33 further rotates in the counterclockwise direction (arrow E direction) in FIG. 6 from the state of FIG. 6D, the cam follower 31c and the movable cam member 52 come out of contact with each other. When the contact between the cam follower 31c and the movable cam member 52 is released, the movable cam member 52 is moved by the biasing force of the movable cam biasing spring 53 so that the other end of the movable cam member 52 approaches the inner diameter portion 50b. The cam member 52 rotates to be in the state of FIG. 6B again. After the state of FIG. 6B, when the mirror cam gear 33 rotates counterclockwise (arrow E direction) in FIG. 6, the operations from FIG. 6B to FIG. 6D are repeated. Therefore, in the operation from FIG. 6B to FIG. 6D, the cam follower 31c does not slide on the outer peripheral surface of the cam portion 50a, so the quick return mirror 30 continues to maintain the mirror-up state.

  When the mirror cam gear 33 is rotated in the clockwise direction in FIG. 6 in the state shown in FIG. 6B, the operation from FIG. 5B to FIG. 5D is performed, and the cam follower 31c moves to the outer periphery of the movable cam member 52. After sliding on the side, the outer peripheral surface of the cam portion 50a is slid. Accordingly, the mirror drive lever 31 is rotated counterclockwise in FIG. 6 against the urging force of the mirror up spring 36, and the quick return mirror 30 is lowered to the state shown in FIG. 6A.

  Thus, in this embodiment, it is possible to realize different movements of the mirror mechanism 59 depending on the rotation direction of the mirror cam gear 33.

  When the mirror cam gear 33 is rotated clockwise (D direction in FIG. 5) from the mirror-down state of the quick return mirror 30 shown in FIG. 5A, the quick return mirror 30 is mirrored in conjunction with the rotation of the mirror cam gear 33. Transition from the down state to the mirror up state. Then, the quick return mirror 30 enters the mirror-down state again. On the other hand, when the mirror cam gear 33 is rotated counterclockwise (E direction in FIG. 6) from the mirror-down state of the quick return mirror 30 shown in FIG. 6A, the quick return mirror 30 is moved from the mirror-down state to the mirror-up state. Migrate to The mirror cam gear 33 can be rotated while maintaining the mirror-up state after shifting to the mirror-up state.

  As a result, as will be described later, it is possible to realize a movement for driving both the mirror mechanism 59 and the shutter mechanism 4 and a movement for driving only the shutter mechanism 4 with the quick return mirror 30 in the mirror-up state.

  Next, the operation of the shutter mechanism 4 will be described with reference to FIGS. FIG. 7 is a diagram illustrating the operation of the shutter mechanism 4 when photographing (finder photographing) while looking through the optical finder 7 and observing the subject. FIG. 7 illustrates the operation of the shutter mechanism 4 when the gear 62 rotates counterclockwise (arrow F direction) in FIG. However, since the shutter mechanism 4 is driven by the four-bar linkage mechanism 69 as described above, the same operation is performed even when the gear 62 rotates clockwise in FIG.

  In FIG. 7A, the leading blade group 66 (leading blade driving lever 34) and the trailing blade group 67 (rear blade driving lever 35) are charged against the biasing force of the shutter biasing springs 68a and 68b, respectively. It is a figure which shows a state. In this state, the leading blade electromagnet 39 and the trailing blade electromagnet 40 are energized, and the leading blade armature 37 and the trailing blade armature 38 of the leading blade driving lever 34 and the trailing blade driving lever 35 are held.

  When the gear 62 rotates counterclockwise (arrow F direction) in FIG. 7 from the state of FIG. 7A, the rotational motion of the gear 62 is converted into the swing motion of the leading blade cam lever 60 by the four-bar linkage mechanism 69. Is done. As a result, as shown in FIG. 7B, the leading blade cam lever 60 moves away from the leading blade charge follower 34b and the charge is released.

  When the gear 62 further rotates counterclockwise (arrow F direction) in FIG. 7 from the state of FIG. 7B, the leading blade cam lever 60 hits the release pin 61a of the trailing blade cam lever 61, and the trailing blade cam lever 61 is in FIG. Rotate clockwise. As a result, as shown in FIG. 7C, the trailing blade cam lever 61 is separated from the trailing blade charge follower 35b to release the charge.

  Even if the leading blade electromagnet 39 is de-energized at the time of FIG. 7B and the leading blade drive lever 34 travels, the leading blade cam lever 60 moves to a position that does not impede its movement, and the trailing blade cam lever 61 A release pin 61a is provided at a position where a non-driven state can be realized. Further, the position where the release pin 61a is provided is such that the rear blade electromagnet 40 is de-energized at the time of FIG. 7C, and even if the rear blade drive lever 35 travels, the rear blade is moved to a position where the movement is not hindered. It is also necessary to be in a position where the cam lever 61 can be driven.

  In FIG. 7C, the leading blade driving lever 34 and the trailing blade driving lever 35 are in a travelable state. When the gear 62 is rotated counterclockwise (arrow F direction) in FIG. 7 until this state is reached, the rotation of the gear 62 is stopped, the energization to the leading blade electromagnet 39 is interrupted, and then the energizing to the trailing blade electromagnet 40 is performed. Cut off. As a result, as shown in FIG. 7D, the leading blade driving lever 34 and the trailing blade driving lever 35 travel by the urging force of the shutter urging springs 68a and 68b.

  After the traveling of the leading blade driving lever 34 and the trailing blade driving lever 35 is completed, the rotation of the gear 62 in the counterclockwise direction (arrow F direction) in FIG. 7 is resumed to drive the leading blade cam lever 60. Then, after the charging of the shutter urging spring 68a by the leading blade charge follower 34b (charging of the leading blade group 66) is completed, the leading blade cam lever is connected to the charging pin 61b of the trailing blade cam lever 61 as shown in FIG. 60 contacts. Thereby, the charging of the shutter urging spring 68b by the trailing blade charge follower 35b (charging of the trailing blade group 67) is started, and when the charging of the shutter urging spring 68 by the trailing blade charge follower 35b is completed, FIG. Return to the state.

  In the present embodiment, the position of the charge pin 61b is set so that the charging of the shutter biasing spring 68b by the trailing blade charge follower 35b is started after the charging of the shutter biasing spring 68a by the leading blade charge follower 34b is completed. doing. The present invention is not limited to this.

  For example, the charge areas of the leading blade charge follower 34b and the trailing blade charge follower 35b may be overlapped, and the position of the charge pin 61b may be set based on the performance of the motor 41, the necessary continuous shooting performance, and the like. However, when the exposure surface of the image sensor 10 must be shielded by the leading blade group 66 and the trailing blade group 67, it is necessary to precede the charging of the shutter urging spring 68a by the leading blade charge follower 34b.

  FIG. 8 is a diagram illustrating the operation of the shutter mechanism 4 during live view shooting. In FIG. 8, the operation of the shutter mechanism 4 when the gear 62 rotates in the clockwise direction (arrow G direction) in FIG. 8 will be described. The shutter mechanism 4 operates in the same manner as in the above-described finder shooting. The same operation is performed even when the motor rotates counterclockwise in FIG.

  In FIG. 8A, the leading blade group 66 (leading blade drive lever 34) is in a travel-completed state, and the trailing blade group 67 (rear blade driving lever 35) is charged against the biasing force of the shutter biasing spring 68b. FIG. In this state, the rear blade electromagnet 40 is energized, and the rear blade armature 38 of the rear blade drive lever 35 is held.

  When the gear 62 rotates in the clockwise direction (arrow G direction) in FIG. 8 from the state of FIG. 8A, the rotational motion of the gear 62 is converted into the swing motion of the leading blade cam lever 60 by the four-bar linkage mechanism 69. The As a result, the leading blade cam lever 60 hits the release pin 61a of the trailing blade cam lever 61, and the trailing blade cam lever 61 is driven and the trailing blade cam lever 61 moves away from the trailing blade charge follower 35b as shown in FIG. 8B. The charge of the rear blade group 67 is released. When the charge of the trailing blade group 67 is released, the trailing blade drive lever 35 is ready to travel.

  After the gear 62 is rotated clockwise (in the direction of arrow G) in FIG. 8 until the trailing blade drive lever 35 can travel, the rotation of the gear 62 is stopped and the power supply to the trailing blade electromagnet 40 is interrupted. As a result, as shown in FIG. 8C, the rear blade drive lever 35 travels by the biasing force of the shutter biasing spring 68, and after the travel is completed, the gear 62 rotates in the clockwise direction (arrow G direction) in FIG. And the leading blade cam lever 60 is driven.

  When the leading blade cam lever 60 is driven and the charging of the shutter urging spring 68a by the leading blade charge follower 34b is completed, the leading blade cam lever 60 contacts the charge pin 61b of the trailing blade cam lever 61 as shown in FIG. Touch. Thereafter, charging of the shutter urging spring 68b by the trailing blade charge follower 35b (charging of the trailing blade group 67) is started. After the completion of the charging, as shown in FIG. 8E, the rotation of the gear 62 is stopped, the leading blade electromagnet 39 is energized, and the leading blade armature 37 of the leading blade drive lever 34 is held.

  With the leading blade electromagnet 39 energized and holding the leading blade armature 37 of the leading blade drive lever 34, the rotation of the gear 62 in the clockwise direction in FIG. Then, as shown in FIG. 8 (f), the leading blade cam lever 60 is driven to a position where the charging of the leading blade group 66 by the leading blade charge follower 34b is not hindered and the trailing blade cam lever 61 is not driven. Thereafter, the energization of the leading blade electromagnet 39 is interrupted and the leading blade drive lever 34 is caused to travel, thereby returning to the standby state shown in FIG.

  In the present embodiment, the rotational movement of the gear 62 is converted into the swinging movement of the leading blade cam lever 60 by using the four-bar linkage mechanism 69, so that the same applies regardless of whether the gear 62 is rotated in the left or right direction. A shutter operation can be performed. Further, after the leading blade cam lever 60 is driven, the trailing blade cam lever 61 is started to rotate with a delay.

  Thereby, only the charge while shielding the exposure surface of the image sensor 10 with the leading blade group 66 and the trailing blade group 67 and the charging of the leading blade group 66 are released, and the trailing blade group 67 is mechanically held during live view shooting. It becomes possible. As a result, it is possible to achieve both high-speed continuous shooting and power saving during live view shooting.

  FIG. 9 is a flowchart showing a driving sequence of the shutter mechanism 4 and the mirror mechanism 59 during viewfinder photographing by the system control unit 14.

  In FIG. 9, in step S101, when the system control unit 14 detects that the switch SW2 is turned on by, for example, pressing the release button 3 fully, the process proceeds to step S102.

  In step S102, the system control unit 14 drives the motor 41 in reverse rotation via the motor control unit 22 to rotate the mirror cam gear 33 in the clockwise direction in FIG. 5 (arrow D direction), and in step S103, the quick return mirror 30 is moved. The mirror is raised (FIG. 5B). At this time, the gear 62 meshing with the mirror cam gear 33 rotates in the counterclockwise direction (arrow F direction) in FIG.

  Then, the rotation of the gear 62 in the counterclockwise direction (arrow F direction) in FIG. 7 releases the charge of the leading blade group 66 (leading blade driving lever 34) in step S104 (FIG. 7B). In step S105, the charge of the rear blade group 67 (rear blade drive lever 35) is released (FIG. 7C).

  Thereafter, in step S106, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S107.

  In step S107, the system control unit 14 cuts off the energization of the leading blade electromagnet 39 via the shutter control unit 21 and travels the leading blade group 66. In step S108, the system control unit 14 adjusts the exposure amount of the image sensor 10 in step S108. The process proceeds to S109.

  In step S109, the system control unit 14 cuts off the energization of the rear blade electromagnet 40 via the shutter control unit 21 to run the rear blade group 67 (FIG. 7D), and proceeds to step S110.

  In step S110, the system control unit 14 rotates the mirror cam gear 33 in the clockwise direction (arrow D direction) in FIG. 5 by driving the motor 41 reversely again via the motor control unit 22 after the rear blade group 67 travels. Let As a result, in step S111, the quick return mirror 30 is mirrored down (FIG. 5D). At this time, the gear 62 meshing with the mirror cam gear 33 rotates in the counterclockwise direction (arrow F direction) in FIG.

  Then, the rotation of the gear 62 in the counterclockwise direction (arrow F direction) in FIG. 7 starts charging of the leading blade group 66 in step S112 (FIG. 7E), and charging of the trailing blade group 67 is started in step S113. The process proceeds to step S114.

  In step S114, the system control unit 14 stops the motor 41 via the motor control unit 22, whereby the shutter mechanism 4 returns to the standby state in step S115 (FIG. 7A).

  FIG. 10 is a flowchart showing a driving sequence of the shutter mechanism 4 and the mirror mechanism 59 by the system control unit 14 when the mode is switched to the live view shooting mode.

  In FIG. 10, in step S201, when the system control unit 14 detects an operation for switching to the live view shooting mode, the process proceeds to step S202.

  In step S202, the system control unit 14 drives the motor 41 in the reverse direction via the motor control unit 22 to rotate the mirror cam gear 33 in the clockwise direction (arrow D direction) in FIG. 5, and in step S203, the quick return mirror 30 is moved. The mirror is raised (FIG. 5B).

  In step S204, the system control unit 14 mirrors the quick return mirror 30 in step S203, stops the motor 41 via the motor control unit 22, and proceeds to step S205.

  In step S205, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction in FIG. 8 (arrow G direction), and in step S206, the front blade group 66 is rotated. The charge is released (FIG. 8 (f)), and the process proceeds to step S207.

  In step S207, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S208.

  In step S <b> 208, the system control unit 14 cuts off the energization of the leading blade electromagnet 39 via the shutter control unit 21 and causes the leading blade group 66 to travel. As a result, the live view shooting state is set in step S207.

  FIG. 11 is a flowchart showing a driving sequence of the shutter mechanism 4 and the mirror mechanism 59 by the system control unit 14 when electronic front curtain shooting is performed in the live view shooting state. Electronic front curtain photography is a photography technique that replaces the role of the front blade group 66 of the shutter mechanism 4 by resetting the charge of the image sensor 10. Since the electronic front curtain photography is a known technique (for example, Japanese Patent Application Laid-Open No. 2007-53742), description thereof is omitted.

  In FIG. 11, in step S301, when the electronic front curtain shooting mode is selected in the live view shooting state, the system control unit 14 proceeds to step S302 when it detects that the switch SW2 is turned on.

  In step S302, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction in FIG. 8 (arrow G direction), and in step S303, the rear blade group 67 is rotated. The charge is released (FIG. 8B), and the process proceeds to step S304.

  In step S304, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S305.

  In step S305, the system control unit 14 causes the electronic front curtain of the image sensor 10 to travel, adjusts the exposure amount of the image sensor 10 in step S306, and proceeds to step S307.

  In step S307, the system control unit 14 cuts off the energization of the rear blade electromagnet 40 via the shutter control unit 21 and causes the rear blade group 67 to travel (FIG. 8C), and proceeds to step S308.

  In step S308, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction (arrow G direction) in FIG. As a result, charging of the leading blade group 66 is performed at step S309 (FIG. 8D), charging of the trailing blade group 67 is performed at step S310 (FIG. 8E), and charging of the leading blade group 66 is canceled at step S311 (FIG. 8). (F)) is performed.

  In step S312, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S313. Here, the motor 41 may be stopped once between step S310 and step S311.

  In step S313, the system control unit 14 cuts off the energization of the leading blade electromagnet 39 via the shutter control unit 21 to run the leading blade group 66 (FIG. 8A), and in step S314, the live view shooting state is performed. Return to. Note that no matter how many times steps S301 to S314 are repeated, the mirror mechanism 59 only repeats the operations shown in FIGS. 6B to 6D, and the quick return mirror 30 maintains the mirror-up state.

  FIG. 12 is a flowchart showing a driving sequence of the shutter mechanism 4 and the mirror mechanism 59 by the system control unit 14 when shooting using the mechanical front curtain in the live view shooting state.

  In FIG. 12, in step S401, when the mechanical front curtain shooting mode is selected in the live view shooting state, the system control unit 14 proceeds to step S402 when detecting that the switch SW2 is turned on.

  In step S402, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction (arrow G direction) in FIG. The charge of the group 67 is released (FIG. 8B).

  In step S404, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S405.

  In step S405, the system control unit 14 cuts off the energization of the rear blade electromagnet 40 via the shutter control unit 21 to run the rear blade group 67 (FIG. 8C), and proceeds to step S406.

  In step S406, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction (arrow G direction) in FIG. Thus, the leading blade group 66 is charged in step S407 (FIG. 8D), and the trailing blade group 67 is charged in step S408 (FIG. 8E). In step S409, the charge of the leading blade group 66 is released (FIG. 8F), and in step S410, the charge of the trailing blade group 67 is released (FIG. 8A).

  In step S411, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S412. The motor 41 may be stopped once between step S408 and step S409.

  In step S412, the system control unit 14 cuts off the energization of the leading blade electromagnet 39 via the shutter control unit 21 and travels the leading blade group 66 (FIG. 8A). In step S413, the system control unit 14 After adjusting the exposure amount, the process proceeds to step S414.

  In step S414, the system control unit 14 cuts off the energization to the rear blade electromagnet 40 via the shutter control unit 21 to travel the rear blade group 67 (FIG. 8C), and proceeds to step S415.

  In step S415, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction (arrow G direction) in FIG. As a result, charging of the leading blade group 66 is performed at step S416 (FIG. 8D), charging of the trailing blade group 67 is performed at step S417 (FIG. 8E), and charging of the leading blade group 66 is canceled at step S418 (FIG. 8). (F)) is performed.

  In step S419, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S420. At this time, the motor 41 may be stopped once between step S417 and step S418.

  In step S420, the system control unit 14 cuts off the energization of the leading blade electromagnet 39 via the shutter control unit 21 and causes the leading blade group 66 to travel (FIG. 8A), thereby performing live in step S421. Return to view shooting mode. It should be noted that no matter how many times steps S401 to S421 are repeated, the mirror mechanism 59 only repeats the operations from FIG. 6B to FIG. 6D, and the quick return mirror 30 maintains the mirror-up state. .

  FIG. 13 is a flowchart showing a driving sequence of the shutter mechanism 4 and the mirror mechanism 59 by the system control unit 14 at the end of the live view shooting mode.

  In FIG. 13, in step S501, when the system control unit 14 detects a switching operation for ending the live view shooting mode in the live view shooting state, the process proceeds to step S502.

  In step S502, the system control unit 14 drives the motor 41 to rotate forward via the motor control unit 22 to rotate the gear 62 in the clockwise direction (arrow G direction) in FIG. Thereby, the charge of the rear blade group 67 is released in step S503, and the process proceeds to step S504.

  In step S504, the system control unit 14 stops the motor 41 via the motor control unit 22, and proceeds to step S505.

  In step S505, the system control unit 14 cuts off the energization of the rear blade electromagnet 40 via the shutter control unit 21 to travel the rear blade group 67 (FIG. 8C), and proceeds to step S506.

  In step S506, the system control unit 14 drives the motor 41 in reverse rotation via the motor control unit 22 to rotate the mirror cam gear 33 in the clockwise direction (arrow D direction) in FIG. As a result, in step S507, the quick return mirror 30 is mirrored down (FIG. 5D). In step S508, the leading blade group 66 is charged, and in step S509, the trailing blade group 67 is charged.

  In step S510, the system control unit 14 stops the motor 41 via the motor control unit 22, whereby the mirror mechanism 59 and the shutter mechanism 4 return to the standby phase in step S511, and the live view shooting mode ends. In this embodiment, the case where the motor 41 is driven in the reverse direction to perform the finder shooting and the forward rotation drive to perform the live view shooting has been illustrated. However, by changing the configuration of the reduction gear train 42, The reverse direction may be reversed.

  As described above, in this embodiment, the single motor 41 is used to drive and control only the shutter mechanism 4 while maintaining the mirror-up state and the viewfinder shooting for controlling the mirror mechanism 59 and the shutter mechanism 4. Live view continuous shooting can be performed. Thereby, it is possible to perform live view continuous shooting with less sound and vibration while reducing the cost, weight, and size of the camera.

  In the present embodiment, since the image sensor 10 can be shielded from light while the shutter mechanism 4 is charged, the continuous shooting speed can be improved.

  Furthermore, in the present embodiment, the rear blade charge follower 35b is mechanically held by the rear blade cam lever 61 during live view shooting, which eliminates the need to continue energizing the rear blade electromagnet 40 and is effective for power saving.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

4 Shutter mechanism 14 System control unit 30 Quick return mirror 33 Mirror cam gear 34 Lead blade drive lever 35 Rear blade drive lever 37 Lead blade armature 38 Rear blade armature 39 Lead blade electromagnet 40 Rear blade electromagnet 41 Motor 59 Mirror mechanism 60 Lead blade cam lever 61 Rear blade cam lever 66 Lead blade group 67 Rear blade group 69 Four-bar linkage mechanism

Claims (2)

A mirror that enters the imaging optical path during viewfinder observation and retracts from the imaging optical path during imaging, a mirror mechanism that drives the mirror, a shutter that adjusts the exposure amount of the image sensor, a shutter mechanism that drives the shutter, and the mirror An imaging device comprising a mechanism and a motor serving as a drive source for the shutter mechanism,
The shutter mechanism is
A shutter drive member that performs the same shutter drive operation regardless of whether the motor is driven to rotate in the forward direction or the reverse direction,
The mirror mechanism is
A mirror drive member that has a cam follower and that drives the mirror; and a cam portion with which the cam follower comes into contact with the mirror entering the imaging optical path, and is driven to rotate in the forward or reverse direction by the motor. A mirror cam member,
The mirror cam member has one end formed continuously with the cam portion and the other end movable, a biasing portion for biasing the movable cam portion, and the mirror cam member in the reverse direction. A space for the cam follower to enter when being driven to rotate;
When the mirror is retracted from the photographing optical path and the mirror cam member is driven to rotate in the positive direction from the state where the cam follower is not in contact with the cam portion, the mirror is photographed from the state where the mirror is retracted from the photographing optical path. Until the state of entering the optical path, the cam follower slides on the movable cam portion, and the cam follower comes into contact with the cam portion,
When the mirror is retracted from the photographing optical path and the mirror follower is driven to rotate in the reverse direction from a state where the cam follower is not in contact with the cam portion, the cam follower enters the space, and the biasing portion An imaging apparatus, wherein the movable cam portion is moved against the urging force, the mirror is retracted from the photographing optical path, and the cam follower is not in contact with the cam portion. The shutter mechanism is
A leading blade charge follower is provided, and a leading blade driving member that drives the leading blade group;
A trailing blade charge follower is provided, and a trailing blade driving member that drives the trailing blade group;
A leading blade biasing member that generates a biasing force for running the leading blade drive member;
A trailing blade biasing member that generates a biasing force for running the trailing blade drive member;
Leading blade electromagnetic holding means for holding the leading blade driving member using electromagnetic force in a state where the leading blade biasing member is charged by being energized;
Rear blade electromagnetic holding means for holding the rear blade driving member using electromagnetic force in a state where the rear blade biasing member is charged by being energized;
A leading blade cam lever that engages with the leading blade charge follower and rotates in a direction to charge the leading blade biasing member;
A trailing blade cam lever that engages with the trailing blade charge follower and rotates in a direction to charge the trailing blade biasing member;
A four-bar linkage mechanism that converts the rotational motion of the motor into the swing motion of the leading blade cam lever,
In the rear blade cam lever,
A first driven part that rotates the trailing blade cam lever in a direction to charge the trailing blade biasing member by receiving a force from the leading blade cam lever by a swinging motion of the leading blade cam lever;
By receiving the force from the leading blade cam lever by the swinging motion of the leading blade cam lever, the trailing blade cam lever moves away from the trailing blade charge follower in the direction to release the charging of the trailing blade biasing member. A second driven part for rotating the blade cam lever,
The imaging apparatus according to claim 1, wherein the trailing blade cam lever starts rotating with a delay after the leading blade cam lever is driven.

Images