JP6080629B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging device such as a digital camera provided with a shutter device.

  In recent years, a digital camera having a function (hereinafter referred to as a live view) for displaying a subject image captured by an image sensor on a monitor such as an LCD (liquid crystal display) as a finder image for observing the subject at the time of shooting. A camera has been proposed.

  Patent Document 1 proposes an imaging apparatus and a shutter apparatus that perform an imaging operation using both a focal plane shutter and an electronic shutter. This image pickup apparatus starts an exposure operation by a charge accumulation start scan of the image pickup device, and ends the exposure operation by running a blade group composed of a mechanical shutter. In this shutter device, after the drive lever is attracted and held by energizing the electromagnet, the main mirror is moved up and the blade lever is released from tension, and the blade group moves from the closed state to the open state. (Referred to as return). Thereafter, the drive lever is released, and the electromagnet is turned off at a predetermined timing, so that the drive lever and the blade lever are integrally driven to close the shutter opening. In the live view state, since the drive lever is in contact with the cam top of the cam gear, it is not necessary to energize the electromagnet during the live view.

  Patent Document 2 proposes a camera that can select a state in which mirror driving and shutter charge driving are performed using one motor and a state in which the mirror is stopped and shutter charging driving is performed.

JP 2012-118346 A JP 2007-279270 A

  However, in Patent Document 1, since the main mirror and the blade group cannot be driven independently, the main mirror moves during the release even during live view.

  On the other hand, in Patent Document 2, although the main mirror and the blade group can be independently driven by one motor, electromagnet energization during live view is necessary. In addition, since it has a complicated configuration including a planetary mechanism, a shutter dedicated drive member, and a drive member for driving both mirrors and shutters, the size is increased and the cost is increased.

  In view of such problems, the present invention is driven by a single motor that can drive only the blade group without moving the main mirror during live view and does not require energization of the electromagnet during live view. An object of the present invention is to provide a shutter device and an imaging device with a simple configuration.

Imaging apparatus according to one aspect of the present invention, mirror and, first biasing member for biasing the mirror driving member for driving between said mirror mirror-up position and the mirror-down position, the front Symbol mirror drive member A blade member that opens and closes the exposure opening, a blade drive member that drives the blade member, a second biasing member that biases the blade drive member, and a biasing force of the first biasing member The mirror driving member is driven against this to charge the first biasing member, and the blade driving member is driven against the biasing force of the second biasing member to cause the second biasing. A charge member for charging the member, and a mirror charge cam portion that contacts the mirror driving member and a shutter charge cam portion that contacts the blade driving member are formed on the charge member, and the mirror The drive member is the mirror When contacting the cam portion, the charge member is rotated in the first direction so that the charge member charges the first urging member and the second urging member, and the mirror driving member is When not in contact with the charge cam portion, the charge member charges the second urging member without charging the first urging member by rotating the charge member in the first direction. It is characterized by that.

  According to the present invention, it is possible to drive only the blade group without moving the main mirror during live view, and a simple configuration imaging apparatus driven by one motor that does not require energization of the electromagnet during live view. Can be provided.

1 is a central cross-sectional view of a digital single lens reflex camera main body and an interchangeable lens as an imaging apparatus according to an embodiment of the present invention. It is a disassembled perspective view of a shutter unit. It is the top view and perspective view which show the principal part of a shutter unit. It is a side view which shows the principal part of a shutter unit. It is a partial enlarged view of a shutter unit. It is the figure which showed the cam diagram of a cam gear, the control voltage of a motor, and the operation | movement of the mechanism in each phase. FIG. 6 is a plan view showing a moment of releasing tension in a normal mode of the shutter unit. It is a top view showing the state in which the blade | wing return was completed in the normal mode of a shutter unit, and the bound lock operation | movement is effective. FIG. 7 is a plan view showing a state in which the cam gear is at the end of the bound lock phase after the mirror up operation is completed in the normal mode of the shutter unit. It is a top view showing the standby state before driving in the normal mode of the shutter unit. It is a top view which shows the state which the driving | running | working operation was completed in the normal mode of a shutter unit. It is a top view showing the completion state of the mirror charge operation in the normal mode of the shutter unit. It is a top view showing the completion state of the bound lock setting operation | movement in the normal mode of a shutter unit. FIG. 10 is a plan view showing a state where the tightening setting operation is completed in the normal mode of the shutter unit. It is a top view showing the moment of tension release in silent mode of a shutter unit. It is a top view showing the state in which the blade | wing return was completed and the bound lock operation | movement is effective in the silent mode of a shutter unit. It is a top view showing the start state of the bound lock release operation | movement in silent mode of a shutter unit. It is a top view showing the start state of the mirror up operation | movement in the silent mode of a shutter unit. It is a top view showing the state which the mirror up operation | movement in silent mode of a shutter unit was completed. It is a top view showing the live view state of a shutter unit. It is a top view showing the standby state before driving in the live view shooting mode of the shutter unit. FIG. 10 is a plan view illustrating a state in which a traveling operation is completed in a live view shooting mode of the shutter unit. It is a top view showing the state where the bound lock set operation was completed in the live view shooting mode of the shutter unit. FIG. 10 is a plan view showing a state in which a tight setting operation is completed in the live view shooting mode of the shutter unit. FIG. 6 is a plan view showing a state in which a rear curtain charging operation is completed in a live view shooting mode of the shutter unit. FIG. 10 is a plan view illustrating a read standby state in the second and subsequent continuous shooting operations in the live view shooting mode of the shutter unit. FIG. 10 is a plan view showing a moment when a tension is released in a shooting operation after the second frame in continuous shooting in the Live View shooting mode of the shutter unit. FIG. 10 is a plan view showing a state in which the blade return is completed and the bound lock operation is enabled in the second and subsequent shooting operations in the continuous shooting in the Live View shooting mode of the shutter unit. FIG. 10 is a plan view showing a state in which the cam gear is at the end of the bound lock phase in the second and subsequent shooting operations in the live view shooting mode of the shutter unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a central cross-sectional view of a digital single-lens reflex camera main body (hereinafter referred to as a camera) 1 and an interchangeable lens 5 as an imaging apparatus according to an embodiment of the present invention.

The interchangeable lens 5 is detachably fixed to the camera 1 by a mount portion 11 on the camera 1 side and a mount portion 51 on the interchangeable lens 5 side. When the interchangeable lens 5 is attached to the camera 1, the contact portion 12 of the camera 1 and the contact portion 52 of the interchangeable lens 5 are electrically connected. Thereby, the camera 1 detects that the interchangeable lens 5 is attached. Further, power supply from the camera 1 to the interchangeable lens 5 and communication for controlling the interchangeable lens 5 are performed via the contact portions 12 and 52.

The light beam that has passed through the focus lens 53 of the interchangeable lens 5 enters the main mirror 13 of the camera 1. The main mirror 13 is held in the main mirror holding frame 131, and is rotatably supported between the Miraa' flop position location and the mirror-down position location by the rotating shaft portion 131a.

  The main mirror 13 is a half mirror, and the light beam transmitted through the main mirror 13 is reflected downward by the sub mirror 14 and guided to the focus detection unit 15.

  The sub mirror 14 is held by the sub mirror holding frame 141. The sub mirror holding frame 141 is pivotally supported with respect to the main mirror holding frame 131 by a hinge shaft (not shown).

  The focus detection unit 15 detects the defocus amount of the focus lens 53 and calculates the drive amount of the focus lens 53 that brings the focus lens 53 into a focused state. The interchangeable lens 5 receives the calculated driving amount via the contact parts 12 and 52. The interchangeable lens 5 controls the motor (not shown) based on the received drive amount, and performs focus adjustment by driving the focus lens 53.

  The light beam reflected by the main mirror 13 is guided to the optical viewfinder 16. The optical viewfinder 16 includes a focus plate 17, a pentaprism 18, and an eyepiece lens 19. The light beam guided to the optical finder 16 by the main mirror 13 forms a subject image on the focus plate 17. The user can observe the subject image on the focusing screen 17 via the pentaprism 18 and the eyepiece lens 19.

  A shutter unit 20 is disposed behind the sub mirror 14. Behind the shutter unit 20, an optical low-pass filter 21, an image sensor holder 22, an image sensor 23, a cover member 24, and a rubber member 25 are disposed. At the time of shooting, the light beam that has passed through the optical low-pass filter 21 enters the image sensor 23. The image sensor holder 22 is fixed to the housing of the camera 1 with screws (not shown). The image sensor 23 is held by an image sensor holder 22. The cover member 24 protects the image sensor 23. The rubber member 25 holds the optical low-pass filter 21 and seals between the optical low-pass filter 21 and the image sensor 23.

  The display monitor 26 is a monitor composed of an LCD (liquid crystal display) or the like, and displays a captured image and various setting states of the camera 1.

  FIG. 2 is an exploded perspective view of the shutter unit 20 and the main mirror 13.

  The shutter base plate 201 is fixed to a mirror box (not shown) in the camera 1, and each component constituting the drive mechanism of the trailing blade group (blade member) 212 is attached. The shutter base plate 201 has an opening (exposure opening) 201e through which a subject light flux passes. The opening 201e is closed when the trailing blade group 212 is deployed, and the opening 201e is opened when the trailing blade group 212 is superimposed. The trailing blade group 212 is normally closed.

  The mirror drive lever (mirror drive member) 202 is supported so as to be rotatable about the shaft portion 203 a of the MG main plate 203. A contact portion 202 a formed on the mirror drive lever 202 contacts a shaft portion 131 b that is a driven portion of the main mirror holding frame 131. The main mirror holding frame 131 is biased by a spring (not shown) so as to follow the movement of the mirror drive lever 202.

  The cam gear (cam member) 204 is supported so as to be rotatable about a shaft 201 b formed on the shutter base plate 201.

The rear curtain drive lever ( blade drive member) 205 is supported so as to be rotatable about a shaft 201 a formed on the shutter base plate 201. The rear curtain drive lever 205 is formed with a cylindrical portion 205a, and a blade lever (blade moving member) 206 is rotatably supported by the cylindrical portion 205a. The blade lever 206 rotates between a closed position where the trailing blade group 212 closes the opening 201e and an open position where the trailing blade group 212 opens the opening 201e.

  The tension lever (locking member) 207 is supported so as to be rotatable about a shaft 201 c formed on the shutter base plate 201. A cam follower 207 a provided on the tension lever 207 abuts on a tension cam 204 c provided on the cam gear 204. When the cam gear 204 rotates, the cam follower 207a traces the tension cam 204c, and the tension lever 207 swings.

  The bound lock lever (regulating member) 208 is supported so as to be rotatable about a shaft 201 d formed on the shutter base plate 201. When the tightening lever 207 presses the roller 208a provided on the bound lock lever 208, the bound lock lever 208 rotates. The bound lock lever 208 moves between a restriction position that restricts the movement of the blade lever 206 and a release position that releases the movement restriction of the blade lever 206.

  The armature 209 is provided on the rear curtain drive lever 205, and the electromagnet 210 is provided on the MG base plate 203. The electromagnet 210 includes a yoke 210a and a coil 210b provided on the outer periphery of the yoke 210a. When a voltage is applied to the coil 210b, a magnetic force is generated in the yoke 210a, and the armature 209 can be attracted by this magnetic force.

  The motor 211 is attached to the shutter base plate 201. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213 disposed on the back side of the shutter base plate 201, and the cam gear 204 rotates. By this rotation, the mirror drive lever 202, the rear curtain drive lever 205, the blade lever 206, the tension lever 207, and the bound lock lever 208 are rotated, and the main mirror 13 is rotated and the rear curtain blade group 212 is reciprocated. The action can be performed. The motor 211 is provided with terminals 211a and 211b. By setting the voltage applied to the terminals 211a and 211b so that the direction of the current flowing through the motor 211 is switched, the rotation direction of the motor 211 can be switched.

  Next, the configuration of the shutter unit 20 will be described in detail with reference to FIGS. 3 to 5 show a state where the camera 1 is stopped.

  3A and 3B are diagrams in which only main members of the shutter unit 20 are extracted. FIG. 3A is a plan view seen from the subject side (the main mirror side in FIG. 2), and FIG. 3B is a view seen from the subject side. FIG. 3C is a perspective view seen from the photographer side.

  4 is a diagram in which only main members of the shutter unit 20 are extracted. FIG. 4 (a) is a side view seen from the direction A in FIG. 3, and FIG. 4 (b) is a side view seen from the direction B in FIG. It is.

  FIG. 5 is a partially enlarged view of the shutter unit 20. FIG. 5A is a plan view showing only the substantially right half of the shutter unit 20 as seen from the subject side. Only the main shape of the mirror drive lever 202 is described. FIG. 5B is a view showing the state in which the mirror drive lever 202 is omitted from FIG. 5A and only the cam gear 204 is cut along the section CC in FIG. 4A. It should be noted that unnecessary parts are omitted for easy understanding of the drawings.

  3 to 5 all show the state of the shutter unit 20 when the camera 1 is stopped.

  A mirror drive spring (first urging member) Sp1 is attached to the mirror drive lever 202. In FIG. 5, the mirror drive spring Sp1 biases the mirror drive lever 202 in the clockwise direction (the direction in which the main mirror 13 is raised). The cam follower 202b is in contact with a first mirror cam surface 204a1 provided on the mirror cam 204a. The mirror cam 204a performs a charging operation of the mirror drive spring Sp1 of the mirror drive lever 202 via the cam follower 202b.

  The rear curtain drive lever 205 is attached with a rear curtain drive spring (second urging member) Sp2. In FIG. 5, the rear curtain drive spring Sp2 urges the rear curtain drive lever 205 in the clockwise direction (the direction in which the rear curtain blade group 212 is deployed). A roller 205 b provided on the rear curtain drive lever 205 is in contact with a rear curtain cam (drive cam) 204 b provided on the cam gear 204. In FIG. 5, the trailing curtain drive lever 205 is in an overcharge state. The rear curtain cam 204b performs a charging operation of the rear curtain drive spring Sp2 attached to the rear curtain drive lever 205 via the roller 205b. The urging force of the rear curtain drive spring Sp2 is stronger than the urging force of a blade lever urging spring Sp5 of the sub arm 212b described later.

  The rear curtain drive lever 205 is provided with an armature support portion 205c, and the armature support portion 205c is formed with a through hole (not shown). An armature shaft 209a which is integrally attached to the armature 209 and has a flange portion larger than the inner diameter of the through hole portion is engaged with the through hole portion. The armature shaft 209a extends in a direction substantially orthogonal to the suction surface of the armature 209. An armature separation spring (not shown) is disposed between the armature 209 and the armature support portion 205c. The matcher separation spring biases the armature 209 and the armature support portion 205c in a direction to separate them from each other.

  A drive pin 206 a provided on the blade lever 206 passes through a groove 201 f formed on the shutter base plate 201 and engages with a hole 212 a 1 formed on the main arm 212 a of the trailing blade group 212. The rear curtain blade group 212 includes a main arm 212a, a sub arm 212b, a first blade 212c, a second blade 212d, a third blade 212e, and a blade crimping dowel 212f, and forms a parallel link mechanism. Further, a blade lever biasing spring (fifth biasing member) Sp5 is attached to the sub arm 212b. The blade lever biasing spring Sp5 biases the force in the direction in which the trailing blade group 212 is superimposed. Since the drive pin 206a is engaged with the hole 212a1, the blade lever 206 and the main arm 212a operate integrally. The rotation range of the blade lever 206 is limited by the groove 201f. Further, the protrusion 206c provided on the blade lever 206 abuts on the protrusion 205d provided on the trailing blade driving lever 205, so that the blade lever 206 is moved when the trailing blade group 212 is deployed. And rotate together.

  A tension lever biasing spring (third biasing member) Sp3 is attached to the tension lever 207. In FIG. 5, a tension lever biasing spring Sp3 biases the tension lever 207 in the counterclockwise direction. 3-5, the cam follower 207a is not in contact with the tension cam (locking cam) 204c, and the locking portion 207b of the tension lever 207 hits the wall (projection) 206d of the blade lever 206. It is in the state. The locking portion 207 b locks the locked portion 206 b provided on the blade lever 206. Therefore, the trailing blade group 212 is maintained in the unfolded state without moving in the superimposing direction.

In this case, the wall portion 206d is provided between the suction surface of the electromagnet 210 and the armature 209, the locking surface of the locking portion 207b and the engaged portion 206 b. By repeatedly engaging and releasing the locking between the locking part 207b and the locked part 206b, it is considered that the locking part 207b and the locked part 206b are worn and wear powder is generated. However, since the wall 206d is formed at the position described above, the generated wear powder is less likely to adhere to the attracting surfaces of the electromagnet 210 and the armature 209. Further, since the attracting surfaces of the electromagnet 210 and the armature 209 are not opposed to the retaining surfaces of the locking portion 207b and the locked portion 206b, the generated abrasion powder adheres to the attracting surface of the electromagnet 210 and the armature 209. It is difficult to do.

  Further, as shown in FIG. 4, the wall portion 206 d also has a role as a light shielding wall of the photo interrupter 215. The position of the blade lever 206 can be detected by allowing the wall 206d to block or pass the output light from the photo interrupter 215.

  A torsion coil spring (fourth urging member) Sp4 is attached to the bound lock lever 208. In FIG. 5, the torsion coil spring Sp4 biases the bound lock lever 208 in the counterclockwise direction. In FIG. 5, the bound lock lever 208 is in contact with the arc portion 206 e of the blade lever 206. When the tension lever 207 swings, the protrusion 207c of the tension lever 207 contacts the roller 208a, and the bound lock lever 208 swings.

  Next, the operation of the shutter unit 20 when actually shooting is described with reference to FIGS.

  In the following description, a mode in which the photographer shoots while confirming the subject image with the optical finder 16 is defined as a finder photographing mode, and a mode in which the photographer shoots while confirming the subject image with the display monitor 26 is defined as a live view photographing mode.

  Further, rotating the cam gear 204 clockwise as viewed from the subject side is defined as normal rotation and rotating counterclockwise is defined as reverse rotation. Similarly, the rotation direction of the motor 211 when the cam gear 204 rotates forward is defined as the normal rotation direction (first direction), and the rotation direction of the motor 211 when the cam gear 204 rotates reversely is defined as the reverse rotation direction (second direction). To do.

FIG. 6 is a list showing the cam diagram of the cam gear 204, the control voltage of the motor 211, and the mechanical operation at each phase. In addition, the control in each of the finder shooting mode and the live view shooting mode is shown in a list, and drawing numbers (FIGS. 5 and 7 to 29) corresponding to the respective points are also described. In FIG. 6, the cam gear 204 rotates 360 degrees by proceeding with angles A, B, C... O, P, A. In FIG. 6, FD indicates a finder, LV indicates a live view, and BL indicates a bound lock.

7 to 29 are diagrams showing each operation state of the shutter unit 20. 7 to 29, each drawing (a) is a plan view showing only the substantially right half of the shutter unit 20 as seen from the subject side. Only the main shape of the mirror drive lever 202 is described. Each figure (b) is the figure which abbreviate | omitted the mirror drive lever 202 from (a) of each figure, and has shown the state which cut | disconnected only the cam gear 204 in the cross section CC of Fig.4 (a). It should be noted that unnecessary parts are omitted for easy understanding of the drawings.
<Finder shooting mode>
First, the operation in the viewfinder shooting mode will be described.

In the viewfinder shooting mode, the “normal mode” gives priority to speeding up the continuous shooting frame speed and shortening the release time lag, and quieter mirror operation sound than speeding up the continuous shooting speed and reducing the release time lag. There are two types of "silent mode" that are prioritized. Here, the mirror operating sound is a sound generated when the main mirror holding frame 131 collides with the mirror box when the main mirror holding frame 131 moves back and forth with respect to the photographing optical path.
[Normal mode]
When the camera 1 is in the stop state, which is the first state, the cam gear 204 is in the camera stop state (first phase) shown between the angle A and the angle B in FIG. FIG. 5 shows the state of the angle A. When shooting in the normal mode, the armature 209 and the yoke 210a are attracted by energizing the coil 210b while the camera is stopped, and the cam gear 204 is rotated normally by applying a voltage in the normal rotation direction to the motor 211. As the cam gear 204 rotates forward, the angle of the cam gear 204 advances in the order of angles B, C, D, E, and F.

  FIG. 7 shows the state of the angle C, and shows the moment when the cam gear 204 rotates forward from the state of FIG. 5 and the lock of the blade lever 206 and the tension lever 207 is released. In FIG. 7B, the tensioning cam 204c presses the cam follower 207a, whereby the tensioning lever 207 rotates clockwise, and the locking part 207b is disengaged from the locked part 206b. This state is called a “tightening release state”.

  FIG. 8 shows a state of the angle D, and shows a state in which the blade lever 206 is rotated counterclockwise from the state of FIG. In FIG. 7, when the locking lever 207 and the blade lever 206 are unlocked, the blade lever 206 rotates counterclockwise. At this time, the rear-curtain blade group 212 changes from a state where it covers the opening 201e of the shutter base plate 201 to an open state. The operation of the blade lever 206 is referred to as “blade return operation”.

  In FIGS. 5 and 7, the bound lock lever 208 is stopped in contact with the arc portion 206 e of the blade lever 206. In FIG. 8, when the blade lever 206 is rotated counterclockwise, the bound lock lever 208 is also rotated counterclockwise, and the stopper portion 208b of the bound lock lever 208 is in contact with the protruding portion 201g of the shutter base plate 201. At rest.

  The blade lever 206 that has performed the blade return operation causes a so-called bounce in which the protruding portion 206c does not collide with the protrusion 205d of the trailing curtain drive lever 205. However, since the lock portion 208c of the bound lock lever 208 enters the clockwise movement trajectory of the blade lever 206, the locked portion 206f of the blade lever 206 contacts the lock portion 208c, and the bound amount is limited. . Since the bound amount is limited, the bound time is also suppressed. A series of operations is called “bound lock operation”. The position where the stopper portion 208b of the bound lock lever 208 abuts against the protrusion 201g of the shutter base plate 201 is a restriction position that restricts the movement of the blade lever 206 from the open position to the closed position. After the blade lever 206 moves from the closed position to the open position, the bound lock lever 208 enters the movement locus of the blade lever 206, thereby restricting the movement of the blade lever 206 from the open position to the closed position.

  In FIG. 8, the cam follower 207a is in contact with a second cam surface 204c2 formed on the tightening cam 204c. That is, the tension lever 207 is in a state of rotating further clockwise than the state of FIG.

Further, in FIG. 8, the roller 205b is separated from the cam surface 204b1 of the trailing curtain cam 204b, and the overcharge state is released.

  FIG. 9 shows a state at an angle E, and shows a state in which the cam follower 202b of the mirror drive lever 202 is detached from the first mirror cam surface 204a1 of the mirror cam 204a and rotated clockwise. At this time, the contact portion 202a of the mirror drive lever 202 is in contact with the shaft portion 131b of the main mirror holding frame 131 (not shown in FIG. 9). The main mirror holding frame 131 is in contact with the mirror box and is retracted from the photographing optical axis. A series of operations is called “mirror up operation”.

  In FIG. 9, the cam follower 207a is in contact with the end of the second cam surface 204c2. That is, the tension lever 207 does not move between FIG. 8 (angle D) and FIG. 9 (angle E).

  FIG. 10 shows a state at an angle F, and shows a standby state before traveling (second state) in which the tension lever 207 and the bound lock lever 208 are rotated clockwise from the state of FIG. In the process of moving from the state of FIG. 9 to the state of FIG. 10, the cam follower 207 a changes from the state of tracing the second cam surface 204 c 2 to the state of tracing the first cam surface 204 c 1, thereby Rotate. The first cam surface 204c1 is formed such that the cam diameter from the rotation center to the outer peripheral surface is longer than that of the second cam surface 204c2. Further, the bound lock lever 208 rotates clockwise when the roller 208a is pressed by the protrusion 207c. At this time, the lock portion 208c of the bound lock lever 208 is retracted from the movement locus of the blade lever 206. A series of operations is called a “bound lock release operation”. The position where the lock portion 208c of the bound lock lever 208 is retracted from the movement locus of the blade lever 206 is the release position. Before the trailing curtain drive lever 205 drives the blade lever 206, the tension lever 207 moves the bound lock lever 208 from the restriction position to the release position.

  In the state of FIG. 10, a photographing exposure operation is started by performing reset scanning of the pixels of the image sensor 23 (hereinafter referred to as electronic front curtain travel). After the electronic front curtain travel starts, after the time interval corresponding to the set shutter time elapses, the current to the coil 210b is cut off, so that the armature 209 and the yoke 210a are separated. When the armature 209 and the yoke 210a are separated from each other, the trailing blade driving lever 205 and the blade lever 206 are integrally rotated clockwise by the urging force of the trailing blade driving spring Sp2. Accordingly, the rear curtain blade group 212 is in the state of FIG. 11 covering the opening 201e of the shutter base plate 201. The operation in which the trailing curtain drive lever 205 and the blade lever 206 travel together is referred to as “traveling operation”.

  Here, the voltage applied to the motor 211 in the section from the angle A to the angle F will be described. First, in the camera stop state, a voltage (first voltage) V1 is applied so as to cause the motor 211 to rotate forward. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates forward. When the cam gear 204 is in the state of the angle D, the voltage applied to the motor 211 is switched to the voltage (second voltage) V2. When the cam gear 204 is in the state of the angle E, the voltage applied to the motor 211 is switched to the voltage (third voltage) V3. When the cam gear 204 is in an angle F state, the terminals 211a and 211b of the motor 211 are short-circuited. That is, by applying a so-called short brake to the motor 211, the cam gear 204 stops during the viewfinder imaging phase (second phase).

  There is the following relationship between the absolute values of the voltages V1 to V3.

Voltage V1> Voltage V2 and voltage V3> Voltage V2
The reason why the voltage V2 is lower than the voltage V1 is to perform the bound lock operation with certainty. The section in which the voltage V2 is applied (angle D to angle E, third phase) is a state in which the bound lock lever 208 enters the travel locus of the blade lever 206 as shown in FIGS. is there. However, there is a time lag until the blade lever 206 bounces after the blade lever 206 starts the blade return operation at the angle C until the locked portion 206f contacts the lock portion 208c. Therefore, if the voltage V2 remains high, the bound lock lever 208 may retract when the blade lever 206 bounces. That is, the bound lock releasing operation is performed before the bound lock operation is completed, and as a result, the bound time is extended.

  In order to perform the bounce lock operation with certainty, the normal shooting bounce lock phase indicated by the angles D to E may be set long, but if set too long, the cam gear 204 has a finite number of 360 degrees per cam rotation. Each phase cannot be efficiently assigned to the angle. In other words, by lowering the voltage V2, it is possible to efficiently use an angle of 360 degrees, and a larger angle can be assigned to work that requires a more angle such as charging. .

  After the bounce lock operation is performed in the normal shooting bounce lock phase, the bounce lock release operation is performed as soon as possible by driving the motor 211 with the voltage V3 higher than the voltage V2. By doing so, the release time lag can be shortened and the frame speed can be increased.

  After the traveling operation, the forward voltage is applied to the motor 211 again, and the cam gear 204 starts to rotate forward.

  When the cam follower 202b is pushed by the second mirror cam surface 204a2 from the angle G to the angle H, the mirror driving lever 202 rotates counterclockwise. FIG. 12 shows a state at an angle H, and shows a state in which the cam follower 202b is in contact with the first mirror cam surface 204a1. In FIG. 12, the mirror drive spring Sp1 has been charged. Further, the main mirror holding frame 131 is in a mirror-down state in which the main mirror holding frame 131 is lowered in conjunction with the mirror driving lever 202 and enters the photographing optical axis. A series of operations is called a “mirror charge operation”.

  From the angle I to the angle J, the tightening lever 207 rotates counterclockwise when the cam follower 207a changes from the state of tracing the first cam surface 204c1 to the state of tracing the second cam surface 204c3. FIG. 13 shows the state of the angle J. As the tightening lever 207 rotates counterclockwise, the bound lock lever 208 rotates counterclockwise and abuts against the arc portion 206e of the blade lever 206. At this time, the roller 208a is in a state separated from the protrusion 207c. A series of operations is called a “bound lock set operation”.

  From the angle K to the angle M, the cam follower 207a falls off from the second cam surface 204c3, and the tightening lever 207 rotates counterclockwise. FIG. 14 shows a state at an angle M, and shows a state in which the tension lever 207 is in contact with the wall portion 206 d of the blade lever 206. This operation of the tension lever 207 is referred to as “a tension setting operation”.

  From the angle M to the angle A, the rear curtain cam 204b of the cam gear 204 pushes the roller 205b to charge the rear curtain drive spring Sp2 and return to the initial state shown in FIG. This operation is called “rear curtain charge operation”. At this time, since the locking portion 207b locks the locked portion 206b, the blade return operation of the blade lever 206 is suppressed. Further, the rear curtain blade group 212 is configured to cover the opening 201e of the shutter base plate 201.

  Here, the voltage applied to the motor 211 in the section from the angle F to the angle A will be described. At the start of driving, the voltage V4 is applied so that the motor 211 rotates forward. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates forward. When the cam gear 204 is in the state of the angle P, the voltage applied to the motor 211 is switched to the voltage V5. When the cam gear 204 is in the state of the angle A, the cam gear 204 is stopped during the phase of the camera stop state by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V4 and V5.

Voltage V4> Voltage V5
By performing such voltage control, the overrun of the cam gear 204 when the motor 211 is stopped becomes smaller than when the same voltage is applied to the motor 211. That is, the phase range in the camera stop state can be set small, and the idling time when the mirror is raised is shortened, leading to an increase in frame speed.
[Silent mode]
When shooting in the silent mode, the armature 209 and the yoke 210a are attracted by energizing the coil 210b while the camera is stopped, and the cam gear 204 is reversed by applying a reverse voltage to the motor 211. As the cam gear 204 reverses, the angle of the cam gear 204 advances in the order of angles P, O, N, M, L, K, J, I, H, and G.

  FIG. 15 shows the state of the angle L, and shows the moment when the cam gear 204 reverses from the state of FIG. 5 and the locking of the blade lever 206 by the tightening lever 207 is released. In FIG. 15B, the cam follower 207a traces the tightening cam 204c, so that the tightening lever 207 rotates clockwise and the locking portion 207b is disengaged from the locked portion 206b. Further, the roller 205b is separated from the cam surface 204b1 of the trailing curtain cam 204b, and the overcharge state is released.

  FIG. 16 shows a state at an angle K, and shows a state in which the blade return operation and the bound lock operation are performed.

  FIG. 17 shows the state of the angle J. In FIG. 17, the cam follower 207a is in a state of tracing the end of the second cam surface 204c3. That is, the tension lever 207 does not move between FIG. 16 (angle K) and FIG. 17 (angle J).

  Bound lock release operation is performed between the angle J and the angle I, and the cam gear 204 is in the state of the angle H.

  FIG. 18 shows a state at an angle H, where the cam follower 202b is in contact with the end of the first mirror cam surface 204a1.

  FIG. 19 shows the state of the angle G. When the cam follower 202b moves along the second mirror cam surface 204a2 from the angle H to the angle G, the mirror driving lever 202 rotates clockwise and the mirror up operation is performed.

  In the mirror up operation in the normal mode, the cam follower 202b is executed by dropping from the first mirror cam surface 204a1. On the other hand, in the silent mode, the cam follower 202b slides on the second mirror cam surface 204a2 from the first mirror cam surface 204a1 to perform the mirror up operation. Therefore, by controlling the rotational speed of the cam gear 204 to be slow, the rotational speed of the mirror drive lever 202 during the mirror up operation can be controlled to be slow, and as a result, the mirror operation sound can be reduced.

  Further, in the state of FIG. 19, the electronic front curtain traveling and the traveling operation are performed.

  Here, the voltage applied to the motor 211 in the section from the angle A to the angle G will be described. First, the voltage V11 is applied so as to reverse the motor 211. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates in the reverse direction. When the cam gear 204 is in an angle K state, the voltage applied to the motor 211 is switched to the voltage V12. When the cam gear 204 is in the angle J state, the voltage applied to the motor 211 is switched to the voltage V13. When the cam gear 204 is in the state of the angle G, the cam gear 204 is stopped during the finder photographing phase by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V11 to V13.

Voltage V11> Voltage V12 and Voltage V11> Voltage V13
The reason why the voltage V12 is set lower than the voltage V11 is that the bound lock operation is reliably performed during the section (intermediate phase) between the angle K and the angle J, as in the normal mode. The reason why the voltage V13 is lowered is to control the rotational speed of the cam gear 204 to be low in order to reduce the mirror operation sound.

  In other words, the release time lag and the frame speed can be made as fast as possible by controlling the voltage V11 irrelevant to the bounce lock operation and the mirror operation sound with a high voltage.

  When the traveling operation is finished, a voltage in the forward direction is applied to the motor 211, the cam gear 204 starts to rotate forward, and proceeds in the angles G, H, I... O, P, A.

Since the operation from the angle G to the angle A is the same as that in the normal mode, detailed description is omitted. Also in FIG. 6, the operation from the angle G to the angle A in the silent mode is omitted.
《Live View shooting mode》
Next, the operation in the live view shooting mode will be described.

  The operation in the live view shooting mode is divided into four operations: a live view transition operation, a live view first frame shooting operation, a live view charge operation, and a live view continuous shooting second frame and subsequent shooting operation.

  The live view transition operation refers to an operation from a state where the camera 1 is stopped to a live view state in which a blade return operation and a mirror up operation are performed and a subject image can be confirmed on the display monitor 26.

  The live view first frame shooting operation refers to the operation from the live view state to the electronic front curtain running and the running operation being completed.

  The live view charge operation refers to an operation from the completion of the first live view shooting operation of the live view or the second and subsequent live view continuous shooting operations until the charging of the trailing curtain drive spring Sp2.

The shooting operation after the second frame of live view continuous shooting refers to the operation from the completion of the live view charge operation to the completion of the electronic front curtain travel and the travel operation.
[Live view migration operation]
In the camera stop state, the armature 209 and the yoke 210a are attracted by energizing the coil 210b, and the cam gear 204 is normally rotated by applying a voltage in the normal rotation direction to the motor 211. As the cam gear 204 rotates in the forward direction, the angle of the cam gear 204 advances as angles B, C, D, E, and F. During this time, the blade return operation and the mirror up operation are performed. That is, the state transitions from the state of FIG. 5 to the state of FIG. Since the control method at this time is the same as that in the normal mode of the finder photographing mode, detailed description is omitted. Also in FIG. 6, the operation from the angle B to the angle F of the live view transition operation is not shown.

  In the normal mode of the finder shooting mode, the electronic front curtain travel and the traveling operation are performed from the state of FIG. 9 and the state is shifted to the state of FIG. 10, but in the live view transition operation, the cam gear 204 is reversed from the state of FIG. Proceed with F, E, D, B.

  FIG. 20 shows the state of the angle B. The cam follower 202b is in a state where it enters a recess 204d formed inside the mirror cam 204a. Due to the presence of the recess 204d, the cam gear 204 can be rotated in the reverse direction while being in the mirror-up state. Further, since the blade return operation is completed, the opening 201e of the shutter base plate 201 is open. Therefore, the subject light can be guided to the image sensor 23 and a live view can be performed.

  After the transition to the state of FIG. 20, the coil 210 b is deenergized, and the subject image captured by the image sensor 23 is displayed on the display monitor 26, thereby entering a live view state (third state).

  Since the roller 205b is on the cam surface 204b1 of the rear curtain cam 204b, the rear curtain drive lever 205 does not travel even when the coil 210b is de-energized. Therefore, it is not necessary to energize the coil 210b during the live view, which contributes to power saving during the live view.

  As can be seen from the above description, the open / close state of the trailing blade group 212 and the up / down state of the mirror drive lever 202 are different between the live view state and the camera stop state, although the cam gear 204 is in the same phase.

  Here, the voltage applied to the motor 211 in the section from the angle F to the angle B will be described. In the live view transition operation, the voltage V21 is applied so as to reverse the motor 211 from the state of FIG. When the cam gear 204 is in an angle B state, the motor 211 is short-circuited.

  There is the following relationship between the absolute values of the voltage V21 and the voltage V4.

Voltage V21 <Voltage V4
The voltage V4 is set as high as possible so that the frame speed can be increased as much as possible. However, in the section in which the voltage V4 is applied, the mirror gear and the rear curtain charge are performed, so the rotation speed of the cam gear 204 is slow. The overrun of the cam gear 204 is suppressed more than when the short brake is applied from the state of the voltage V4 because the short brake is applied after switching to the voltage V5. The first phase that is the phase of the cam gear 204 between the angle A and the angle B is optimally set for this suppressed overrun. For this reason, when the voltage V21 is equal to or higher than the voltage V4, the overrun of the cam gear 204 becomes large, which may cause a problem that the cam gear 204 cannot be stopped during the first phase. If the first phase is increased, the problem of overrun does not occur, but the idling distance of the cam gear 204 at the start of shooting in the normal mode becomes longer and the release time lag becomes longer. In order to avoid the above problem, the voltage V21 is set lower than the voltage V4.
[Live view first frame shooting operation]
In the live view state (the state shown in FIG. 20), the armature 209 and the yoke 210a are attracted by energizing the coil 210b. Then, by reversing the cam gear 204, the angle of the cam gear 204 advances as angles A, P, O... K, J, and I.

  In the interval from angle A to angle M, the overcharge state of the trailing curtain drive lever 205 is released. When the cam follower 207a rides on the second cam surface 204c3 in the section from the angle M to the angle K, the tension lever 207 retracts from the travel locus of the blade lever 206. Then, when the cam follower 207a rides on the first cam surface 204c1 in the section from the angle J to the angle I, the protrusion 207c pushes the roller 208a, and the bound lock lever 208 retracts from the travel locus of the blade lever 206. In this way, the standby state before running in the live view mode shown in FIG. 21 is established.

  In FIG. 21, as in the live view transition operation, the cam follower 202b is in a state where it enters the recess 204d. Due to the presence of the recess 204d, the cam gear 204 can be further reversed from the live view state.

  In the state of FIG. 21, the electronic front curtain traveling and the traveling operation are performed, and the traveling completion state in the live view mode shown in FIG. 22 is obtained.

  Here, the voltage applied to the motor 211 in the section from the angle A to the angle I will be described. First, the voltage V31 is applied so as to reverse the motor 211. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates in the reverse direction. When the cam gear 204 is in an angle K state, the voltage applied to the motor 211 is switched to the voltage V32. When the cam gear 204 is in the state of the angle I, the cam gear 204 stops during the live view shooting phase (fourth phase) by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V31 and V32.

Voltage V31> Voltage V32
By performing such voltage control, the overrun of the cam gear 204 when the motor 211 is stopped becomes smaller than when the same voltage is applied to the motor 211. That is, the range of the live view shooting phase can be set small, and the degree of freedom in designing the second mirror cam surface 204a2 and the recess 204d is increased. As can be seen from FIG. 21, the second mirror cam surface 204a2 and the recess 204d are in a front-back relationship. If the overrun of the cam gear 204 is large, the recess 204d is required in a larger range, and the range of the second mirror cam surface 204a2 must be reduced so that the recess 204d does not penetrate the second mirror cam surface 204a2. Disappear. When the range of the second mirror cam surface 204a2 is reduced, the load applied to the cam gear 204 during mirror charging increases. If the overrun is small, the above problem can be minimized. In addition, if the overrun is small, there is an advantage that the idling time during the live view charge operation is shortened and the frame speed is increased.
[Live View Charge Operation]
When the cam gear 204 is rotated forward from the state shown in FIG. 22 and the angle of the cam gear 204 advances to the angles I, J, K... O, P, A, the live view charge operation is performed.

  The bound lock set operation is performed from the angle I to the angle J, and the bounce lock set operation is completed in the live view shooting mode shown in FIG.

  From the angle K to the angle M, the tension setting operation is performed, and the tension setting operation is completed in the live view shooting mode shown in FIG.

  From angle M to angle A, the rear curtain charge operation is performed, and the live view charge completion state (fourth state) shown in FIG. 25 is obtained. At this time, since the locking portion 207b locks the locked portion 206b, the blade return operation of the blade lever 206 is suppressed, and the trailing blade group 212 keeps covering the opening 201e of the shutter base plate 201. It has become. That is, although the live view state and the live view charge completion state are in the same phase, the open / close state of the trailing blade group 212 is different.

  Here, the voltage applied to the motor 211 in the section from the angle I to the angle A will be described. First, the voltage V41 is applied so that the motor 211 rotates forward. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates forward. When the cam gear 204 is in an angle P state, the voltage applied to the motor 211 is switched to the voltage V42. When the cam gear 204 is in the state of angle A, the cam gear 204 stops during the live view charge completion phase by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V41 and V42.

Voltage V41> Voltage V42
By performing such voltage control, the overrun of the cam gear 204 when the motor 211 is stopped becomes smaller than when the same voltage is applied to the motor 211. That is, the range of the live view charge completion phase can be set small, and the idling time during the shooting operation after the second frame of live view continuous shooting is shortened, leading to an increase in frame speed.

After the live view charge operation is completed, when returning to the live view state without performing continuous shooting, live view transition operation is performed, and when continuous shooting is performed, shooting operation is performed after the second frame of live view continuous shooting.
[Live View continuous shooting after 2 frames]
In the live view charge completion state (the state shown in FIG. 25), the armature 209 and the yoke 210a are attracted by energizing the coil 210b. Then, by reversing the cam gear 204, the angle of the cam gear 204 advances as angles A, P, O... K, J, and I.

  The state of the angle N is a read standby state shown in FIG. In FIG. 26, the roller 205b is separated from the cam surface 204b1 of the trailing curtain cam 204b, and the overcharge state is released.

  When the tension release is performed, the blade return operation is performed. The trailing blade group 212 is in a state in which the opening 201 e is opened, and light is guided to the image sensor 23. However, if a high-luminance light beam is incident on the image sensor 23 while the charge of the image sensor 23 is being read, noise such as smear may be added to the captured image. Therefore, the shutter unit 20 of this embodiment stands by in the read standby state of FIG. 26 until the charge reading of the image sensor 23 is completed. When the charge reading of the image sensor 23 is completed, the cam gear 204 is reversed again.

  FIG. 27 shows the state of the angle L. In FIG. 27B, when the cam follower 207a traces the tightening cam 204c, the tightening lever 207 rotates clockwise, and the locking portion 207b is disengaged from the locked portion 206b.

  FIG. 28 shows a state of the angle K, and shows a state where the blade return operation and the bound lock operation are performed.

  FIG. 29 shows the state of the angle J. In FIG. 29, the cam follower 207a is in a state of tracing the end of the second cam surface 204c3. That is, the tension lever 207 does not move between FIG. 28 (angle K) and FIG. 29 (angle J).

  The bound lock release operation is performed between the angle J and the angle I, and the pre-travel standby state in the live view mode shown in FIG.

  As can be seen from the above description, in the live view first frame shooting operation and the live view second frame and subsequent shooting operations, the start state (live view state / live view charge completion state) and the operation in the middle are different. Is in the state of FIG.

  In the second and subsequent live view shooting operations, the electronic front curtain travel and the travel operation are performed in the state of FIG. 21, as in the live view first frame shooting operation, and the travel completion state in the live view mode shown in FIG. Become. This completes the shooting operation from the second frame of the live view.

  When the shooting operation for the second and subsequent frames of Live View is completed, the Live View Charge operation is performed. When continuous shooting is continued, the shooting operation for the second and subsequent frames of Live View continuous shooting is performed again. .

  Here, the voltage applied to the motor 211 in the section from the angle A to the angle I will be described. First, the voltage V51 is applied so as to reverse the motor 211. The driving force of the motor 211 is transmitted to the cam gear 204 via the gear train 213, and the cam gear 204 rotates in the reverse direction. When the cam gear 204 is in the state of the angle O, the voltage applied to the motor 211 is switched to the voltage V52. When the cam gear 204 is in an angle N state, the cam gear 204 stops during the read standby phase (fifth phase) by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V51 and V52.

Voltage V51> Voltage V52
By performing such voltage control, the overrun of the cam gear 204 when the motor 211 is stopped becomes smaller than when the same voltage is applied to the motor 211. That is, the read standby phase range can be set small, and the idling time during driving at the voltage V53 described later is shortened, leading to an increase in the frame speed.

  After waiting for the charge readout of the image sensor 23 in the readout standby phase range, the voltage V53 is applied so as to reverse the motor 211.

  When the cam gear 204 is in an angle K state, the voltage applied to the motor 211 is switched to the voltage V54. When the cam gear 204 is in the angle J state, the voltage applied to the motor 211 is switched to the voltage V55. When the cam gear 204 is in an angle G state, the cam gear 204 stops during the live view shooting phase by applying a short brake to the motor 211.

  There is the following relationship between the absolute values of the voltages V53 to V55.

Voltage V53> Voltage V54 and Voltage V55> Voltage V54
The reason why the voltage V54 is set lower than the voltage V53 is that the bound lock operation is reliably performed as in the normal mode and the silent mode. In a section where the voltage V54 is applied (angle K to angle J, sixth phase), the bound lock lever 208 enters the travel locus of the blade lever 206 as shown in FIGS. is there. However, there is a time lag until the blade lever 206 bounces after the blade lever 206 starts the blade return operation at the angle L and the locked portion 206f contacts the lock portion 208c. Therefore, if the voltage V54 remains high, the bound lock lever 208 may retract when the blade lever 206 bounces. That is, the bound lock releasing operation is performed before the bound lock operation is completed, and the bound time is extended.

  In order to guarantee the bounce lock operation, the live view shooting bounce lock phase indicated by the angles K to J may be set long. However, if set too long, each phase cannot be efficiently allocated to a finite angle of 360 degrees by one cam rotation of the cam gear 204. In other words, by reducing the voltage V54, an angle of 360 degrees can be used efficiently, and a larger angle can be assigned to work that requires a more angle such as charging. .

  After the bounce lock operation is performed in the live view shooting bounce lock phase, the bounce lock release operation is performed as soon as possible by driving the motor 211 with the voltage V55 higher than the voltage V54. By doing so, the frame speed can be increased.

  As described above, when the shutter unit of the present embodiment is used, only one motor and without using planetary gears, a viewfinder shooting mode for driving both the mirror and the blade group, and a live view for driving only the blade group in the mirror-up state. Both shooting modes of the shooting mode can be implemented.

  As for the voltage control of the present embodiment, the magnitude of the voltage itself may be changed, or the effective value of the voltage may be changed by known PWM control.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

20 Shutter unit 202 Mirror drive lever (mirror drive member)
202b Cam follower 204 Cam gear (cam member)
204a Mirror cam 204b Recess 211 Motor

Claims (6)

Mirror,
A mirror driving member for driving the mirror between a mirror up position and a mirror down position ;
A first urging member for urging the front Symbol mirror drive member,
A blade member that opens and closes an exposure opening;
A blade driving member for driving the blade member;
A second biasing member for biasing the blade driving member;
Driving the mirror driving member against the biasing force of the first biasing member to charge the first biasing member, and driving the blade against the biasing force of the second biasing member A charge member that drives the member to charge the second urging member;
The charge member is formed with a mirror charge cam portion that contacts the mirror drive member and a shutter charge cam portion that contacts the blade drive member,
When the mirror driving member contacts the mirror charge cam portion, the charge member charges the first urging member and the second urging member by rotating the charge member in the first direction. ,
When the mirror driving member is not in contact with the mirror charge cam portion, the charge member rotates in the first direction so that the charge member does not charge the first urging member, and the second biasing member is not charged. An imaging apparatus characterized by charging an urging member . 2. The mirror driving member maintains the mirror in the mirror up position by the biasing force of the first biasing member when the mirror driving member does not contact the mirror charge cam portion. The imaging device described in 1. When the mirror driving member drives the mirror to the mirror up position, the mirror driving member is rotated from the state in which the mirror driving member abuts on the mirror charge cam portion by rotating the charge member in the second direction. the imaging apparatus according to claim 1 or 2, characterized in that switching to a state that does not contact with the mirror charge cam portion. When the mirror drive member contacts the mirror charge cam portion, a cam follower formed on the mirror drive member traces the mirror charge cam portion,
When the mirror driving member does not contact the mirror charge cam portion, the cam follower enters a region between the rotation center of the charge member and the mirror charge cam portion,
When the cam follower enters a region between the rotation center of the charge member and the mirror charge cam portion, the mirror driving member maintains the mirror in the mirror up position by the biasing force of the first biasing member. The imaging apparatus according to any one of claims 1 to 3, wherein A blade moving member that moves between an open position where the blade member opens the exposure opening and a closed position where the blade member closes the exposure opening;
A locking member that moves between a locking position that locks the blade moving member in the closed position and a non-locking position that does not lock the blade moving member in the closed position;
The blade moving member moves from the closed position to the open position independently of the blade driving member;
By the charge member moves the locking member to the unlocked position from the locked position, 4 from claim 1, characterized in that the blade moving member is moved to the open position from the closed position The imaging device according to any one of the above. A regulating member that moves between a regulating position that regulates movement of the blade moving member from the open position to the closed position and a non-regulating position that does not regulate movement of the blade moving member from the opened position to the closed position. When,
A cam member having a cam portion that contacts the locking member and moves the locking member from the locking position to the non-locking position;
After the blade moving member moves from the closed position to the open position, the regulating member moves from the non-regulating position to the regulating position,
The cam member moves the locking member from the non-locking position in a direction opposite to the locking position, so that the locking member moves the restriction member from the restriction position to the non-regulation position. The imaging apparatus according to claim 5.