JP2015022000A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a continuous shooting speed from being delayed in an imaging device controlling an accumulation time of light upon shooting using an electronic front curtain and a rear blade of a focal plane shutter.SOLUTION: A first drive mode is to hold a charge member at a prescribed position after the drive lever is moved to the prescribed position by the charge member after exposed, and release a lock of a blade lever by release means after reading is ended, and a second drive mode is to absorb an armature by electrifying a yoke after the drive lever is moved to the prescribed position by the charge member after exposed, and move the charge lever to a standby position, hold the drive lever by absorbing the armature by means of the yoke, and release a lock of the blade lever by the release means after the reading is ended. A control device 9 controls an image pickup element 2 and a shutter device 2 in the first drive mode upon a single shot, and, upon a continuous shot, the control device 9 controls the image pickup element 2 and the shutter device 3 in the second drive mode.

Description

  The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus having a focal plane shutter.

  In an imaging apparatus having an imaging element and a focal plane shutter, exposure is controlled by the accumulation time of light received by the imaging element.

  Patent Document 1 proposes a method of using an electronic front curtain and a rear blade of a focal plane shutter as a method for controlling the accumulation time of light received by an image sensor during photographing.

JP2012-113112A

  However, in the prior art disclosed in the above-mentioned patent document, the light to the image sensor is shielded by using the rear blades of the focal plane shutter until the image sensor receives light and charges are accumulated and thereafter the charges are read out. There is a need.

Therefore, when performing continuous shooting with these imaging devices, after the readout of the first image is completed,
(I) Running the rear blade of the focal plane shutter and opening the opening (ii) Time is required to take the second image after the drive lever is released from the set release state, and the continuous shooting speed of the imaging device There is a problem of slowing down.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging device that does not slow down the continuous shooting speed in an imaging device that uses an electronic front curtain and a rear blade of a focal plane shutter to control the accumulation time of light received by the imaging device during shooting. That is.

In order to achieve the above object, the present invention provides:
A shutter blade group 202 that travels from a position to open an opening during exposure to a position to close;
A blade lever 208 coupled to the shutter blade group;
A blade return spring 207 that biases the blade lever in a direction in which the shutter blade group opens the opening;
A locking member 214 that locks the blade lever so that the shutter blade closes the opening against the biasing force of the blade return spring after the blade lever travels to close the opening;
Unlocking means 253 for unlocking the blade lever by the locking member;
A driving lever 211 for driving the blade lever in a direction in which the shutter blade closes the opening; a blade driving spring 215 for biasing the driving lever in a direction in which the shutter blade closes the opening;
An armature 212 disposed on the drive lever;
A yoke 213 that attracts the armature when energized;
A charge member 216 that charges the blade drive spring to contact the armature and the yoke and holds the drive lever in a predetermined position by moving the drive lever to a predetermined position;
A shutter 2 consisting of
The imaging element 3 and the shutter 2 are driven in the first drive mode: after the exposure, the charge member moves the drive lever to the predetermined position, the charge member holds the drive lever in the predetermined position, and after the reading is finished, the release means performs the blade Second drive mode for releasing the lock of the lever: After exposure, the charge member moves the drive lever to the predetermined position, then energizes the yoke to attract the armature, moves the charge lever to the standby position, and the yoke In an imaging device having a control device that holds the drive lever by adsorbing the armature and controls by releasing the locking of the blade lever by the release means after the reading is completed,
The control device controls the image sensor and shutter device in the first drive mode during single shooting,
An image pickup apparatus that controls an image pickup element and a shutter device in a second drive mode during continuous shooting.

  According to the present invention, it is possible to provide an imaging apparatus in which the continuous shooting speed is not slowed down in an imaging apparatus that uses the electronic front curtain and the rear blade of the focal plane shutter to control the accumulation time of light received by the imaging element during shooting. .

1 is an external perspective view of an imaging apparatus that is an example of an embodiment of the present invention. 1 is a block diagram of an imaging apparatus 100. FIG. 1 is an overall configuration diagram of an image sensor 3. FIG. 3 is a circuit diagram in one pixel of the image sensor 3. FIG. 3 is an electric circuit of the column common readout circuit 23. 4 is a timing chart showing operations per row in reset scanning and still image readout scanning of the image sensor 3. 3 is a timing chart showing operations per row in reset scanning and moving image reading scanning of the image sensor 3. 6 is a timing chart showing operation timings of the blade lever 208, the drive lever 211, the coil 251, the charge lever 216, the locking member 214, the blade group, and the image sensor. 6 is a timing chart showing operation timings of the blade lever 208, the drive lever 211, the coil 251, the charge lever 216, the locking member 214, the blade group, and the image sensor when moving to the live view. It is a block diagram of the shutter unit 2 used for the camera of this invention (the 1). It is a block diagram of the shutter unit 2 used for the camera of this invention (the 2). It is a block diagram of the shutter unit 2 used for the camera of this invention (the 3). It is a front view which shows the state of the shutter unit in a live view state. It is a rear view which shows the state of the shutter unit in a live view state. It is a figure which shows the state of the shutter unit in an energization holding state. It is a figure which shows the state of the shutter unit in the traveling state of a blade group. It is a figure which shows the state of the shutter unit in the travel completion state of a blade group. It is a figure which shows the state of the shutter unit in a charge completion state. It is a figure which shows the state of the shutter unit in an energization holding state. It is a figure which shows the state of the shutter unit in a preliminary | backup driving state. It is a figure which shows the state of the shutter unit in a preliminary | backup driving state.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an external perspective view of an imaging apparatus which is an example of an embodiment of the present invention.

  On the upper surface of the imaging apparatus 100, an accessory shoe 140 for attaching a photographing accessory such as a power button 110, a release button 130, and a flash device is provided. The lens mount 150 is an attachment portion for a photographing lens (not shown).

  Since the imaging apparatus 100 is a mirrorless type imaging apparatus that does not have a reflex mirror, the shutter curtain is open in a shooting standby state for live view display. Therefore, as shown in FIG. 1, the image pickup surface of the image pickup device 3 is exposed in a state where the photographing lens is removed.

  FIG. 2 is a block diagram of the imaging apparatus 100.

  The focal plane shutter 2 is provided between the imaging lens 1 and the imaging device 3 on the photographing optical path, and adjusts the time for exposing the imaging device 3 in conjunction with the electronic front curtain operation of the imaging device 3.

  A release switch SW2 99 is a switch for starting photographing.

  The image sensor 3 uses a CMOS image sensor or the like, and photoelectrically converts a subject image formed by the imaging lens 1 that forms light from the subject. An analog image signal generated and output by the image sensor 3 is converted into a digital signal by an AFE (Analog Front End) 4. The digital image signal output from the AFE 4 is subjected to various image processing, compression / decompression processing, and the like by a DSP (Digital Signal Processor) 5.

  The recording medium 6 records image data processed by the DSP 5. The display unit 7 uses a liquid crystal display (LCD) or the like, and displays captured images and various menu screens.

  The image sensor driving circuit 8 controls driving of the image sensor 3. The RAM 10 is connected to the DSP 5 and temporarily stores image data and the like. The shutter drive circuit 11 drives the focal plane shutter 2.

  A CPU (control unit) 9 controls the AFE 4, the DSP 5, the image sensor driving circuit 8, and the shutter driving circuit 11.

  The lens control means outputs lens information such as the focal length of the imaging lens 1, aperture diameter, exit pupil diameter, distance between the exit pupil and the image sensor to the CPU 9, and drives the aperture, lens, and the like according to control by the CPU 9. The detection result of each detection means is input to the CPU 9.

  Next, the imaging operation will be described. FIG. 3 is an overall configuration diagram of the image sensor 3, and FIG. 4 is a circuit diagram in one pixel of the image sensor 3.

  In the pixel area PA, the pixel units 20 are arranged on a matrix like p11 to pkn.

  Here, a circuit diagram in one pixel of the pixel portion 20 will be described with reference to FIG.

  A photodiode (hereinafter referred to as PD) 41 photoelectrically converts an incident optical signal and accumulates electric charges according to the exposure amount.

  The charges accumulated in the PD 41 are transferred to the FD (floating diffusion) unit 43 by setting the signal tx of the transfer gate 42 to the high level.

  The FD unit 43 is connected to the gate of a floating diffusion amplifier 44 (hereinafter referred to as an FD amplifier), and the amount of charge transferred from the PD 41 by the FD amplifier 44 is converted into a voltage amount.

  When the signal res of the FD reset switch 45 is set to High level, the FD unit 43 is reset. When resetting the charge of the PD 41, the signal tx and the signal res are simultaneously set to the high level, so that both the transfer gate 42 and the FD reset switch 45 are turned on, and the PD 41 is reset via the FD unit 43. become.

  By setting the signal sel of the pixel selection switch 46 to a high level, the pixel signal converted into a voltage by the FD amplifier 44 is output to the output vout of the pixel unit 20.

  Returning to FIG. 3, the vertical scanning circuit 21 supplies drive signals such as res_1, tx_1, sel_1, and the like to each pixel. These drive signals are connected to res, tx, and sel of each pixel, respectively. The output vout of each pixel is connected to the column common readout circuit 23 via the vertical output line 22 for each column.

  Here, a circuit diagram of the column common readout circuit 23 will be described with reference to FIG.

  The vertical output line 22 is provided for each column, and the output vout of the pixel unit 20 for one column is connected thereto. A current source 24 is connected to the vertical output line 22, and a source follower circuit is configured by the current source 24 and the FD amplifier 44 in each pixel of the pixel unit 20.

  The pixel signal S read from the pixel unit 20 is stored in the S signal holding capacitor 53 via the S signal transfer switch 51 by setting the signal ts to a high level.

  The noise signal N read from the pixel unit 20 is stored in the N signal holding capacitor 54 via the N signal transfer switch 52 by setting the signal tn to a high level.

  The S signal holding capacitor 53 and the N signal holding capacitor 54 are connected to the outputs vs and vn of the column common readout circuit 23, respectively.

  Returning to FIG. 3, horizontal transfer switches 25 and 26 are connected to the outputs vs and vn of the column common readout circuit 23, respectively.

  The horizontal transfer switches 25 and 26 are controlled by an output signal hsr * (* is a column number) of the horizontal scanning circuit 27. When the signal hsr * becomes a high level, the signals of the S signal holding capacitor 53 and the N signal holding capacitor 54 Are transferred to the horizontal output lines 28 and 29, respectively.

  The horizontal output lines 28 and 29 are connected to the input of the differential amplifier 30. The differential amplifier 30 obtains a difference between the S signal and the N signal and simultaneously applies a predetermined gain, and outputs a final image signal to the output terminal 31. Output to.

  The horizontal output line reset switches 32 and 33 are turned ON when the signal chres becomes High, and the horizontal output lines 28 and 29 are reset to the reset voltage Vchres.

  Next, still image readout scanning of the image sensor 3 will be described with reference to FIG. FIG. 6 is a timing chart showing operations per row in the reset scanning and still image reading scanning of the image sensor 3. Here, description will be made assuming that the data in the i-th row is read.

  First, the signal sel_i is set to the High level, and the pixel selection switch 46 of the pixel in the i-th row is turned on.

  Thereafter, the signal res_i is set to the Low level, the FD reset switch 45 is turned OFF, and the reset of the FD unit 43 is released.

  Next, the signal tn is set to the high level, and the N signal is stored in the N signal holding capacitor 54 via the N signal transfer switch 52.

  Subsequently, the signal tn is set to Low, the N signal transfer switch 52 is turned OFF, the signal ts is set to High level, the S signal transfer switch 51 is turned ON, and the transfer gate 42 is turned ON by setting the signal tx_i to High level. .

  By this operation, the signal accumulated in the PD 41 in the selected i-th row is output to the vertical output line 22 via the FD amplifier 44 and the pixel selection switch 46, and further, the S signal is transferred via the S signal transfer switch 51. It is stored in the signal holding capacitor 53.

  Next, after the signals tx_i and ts are set to Low level and the transfer gate 42 and the S signal transfer switch 51 are closed, the signal res_i is set to High level and the FD reset switch 45 is turned on to reset the FD unit 43.

  By the operation so far, the operation of storing the N signal and the S signal in the i-th row in the S signal holding capacitor 53 and the N signal holding capacitor 54 is finished.

  Subsequently, an operation of outputting the S signal and the N signal stored in the S signal holding capacitor 53 and the N signal holding capacitor 54 from the image sensor 3 is performed.

  First, when the output hsr1 of the horizontal scanning circuit 27 becomes a high level, the horizontal transfer switches 25 and 26 are turned ON, and the signals of the S signal holding capacitor 53 and the N signal holding capacitor 54 are differentially compared with the horizontal output lines 28 and 29. The signal is output to the output terminal 31 through the amplifier 30.

  The horizontal scanning circuit 27 outputs all data in the i-th row by sequentially setting the selection signals hsr1, hsr2,..., Hsrk of each column to High.

  While the signals of each column are read by the signals hsr1 to hsrk, the horizontal output line reset switches 32 and 33 are turned on by setting the signal chres to the high level, and the horizontal output lines 28 and 29 are once set to the reset voltage. Reset to Vchres level.

  This completes the reading operation for one row. By repeating this operation for each row, signals of all rows of the image sensor 3 are read out.

  Next, a live view imaging operation for the electronic viewfinder function will be described.

  First, reset scanning of the image sensor 3 is started, and accumulation of each row is sequentially started.

  After a predetermined time has elapsed from the start of reset scanning, live view readout scanning is started. The time from the start of reset scanning to the start of live view readout scanning is the electronic shutter time. This reset scanning and live view readout scanning are performed, for example, by thinning out rows every three rows due to frame rate restrictions. For this reason, the time required for reset scanning and live view readout scanning is shorter than the time required for still image readout scanning, and each can be completed within one frame time such as 30 frames / second.

  FIG. 7 is a timing chart showing operations per row in reset scanning and live view readout scanning of the image sensor 3. Here, it is assumed that the row in which reset scanning is performed is the j-th row, and the row in which live view readout scanning is performed is the i-th row.

  First, in the reset scanning row, the signal res_j is held at a high level, and the signal sel_j is held at a low level. In this state, by setting the signal tx_j to the high level, the PD 41 in the j-th row is reset. Next, by setting the signal tx_j to the low level, the reset of the PD 41 is finished and the storage state is entered.

  In the live view readout scanning row, the same operation as the still image readout scanning described with reference to FIG.

  By repeating this operation for each row, reset scanning / live view readout scanning is performed. In addition, after the reset scan / live view readout scan of the first frame, the reset scan / live view readout scan of the second frame and thereafter is repeated in the same manner.

  FIG. 10A and FIG. 10B are block diagrams of the shutter unit 2 used in the camera of the present invention.

  10 (a), 10 (b), 10 (c), 11 (a) and 11 (b), 201 is a shutter base plate. An opening 201a is formed at the center of the shutter base plate.

  A cover plate (not shown) is attached to the front side of the shutter base plate, and a blade chamber for arranging a blade group is formed between the shutter base plate 201 and the cover plate.

  An opening is formed in the center of the cover plate (not shown) at a position substantially coincident with the opening 201a of the shutter base plate 201, and the light flux passing through the shutter unit 2 is restricted by the two openings.

  The blade group includes a first blade 202a, a second blade 202b, a third blade 202c, a fourth blade 202d, a main arm 204, and a sub arm 205.

  The first blade 202a, the second blade 202b, the third blade 202c, and the fourth blade 202d as shutter blades are formed of polyethylene tephrate containing black paint.

  Each pin 206 is rotatably supported by a pin 206 on the main arm 204 and the sub arm 205.

  A shaft 201f and a shaft 201g are formed on the surface of the shutter base plate.

  The main arm 204 is rotatably supported on the shaft 201 f of the shutter base plate 1, and the sub arm is rotatably supported on the shaft 201 g of the shutter base plate 201.

  The main arm 204 rotates about the shaft 201f and the sub arm 205 rotates about the shaft 201g, so that the first blade 202a, the second blade 202b, the third blade 202c, and the fourth blade 202d are parallel links. Do exercise.

  The main arm 204 is formed with a hole 204a for engaging with an engaging portion 208a of a blade lever 208 described later.

  A blade return spring 207 is applied to the sub arm 205.

  In FIG. 10a, the blade return spring 207 urges the sub arm 205 in the counterclockwise direction, that is, the direction in which the blade group opens the opening 201a of the shutter base plate.

  An arc-shaped groove 201j is formed in the shutter base plate 201, and a stopper rubber 218 is provided at the lower part of the groove.

  The blade lever 208 is rotatably supported on a shaft 201f of the shutter base plate.

  The engaging portion 208a of the blade lever 208 passes through the groove 201j of the shutter base plate and engages with the hole 204a of the main arm 204 disposed on the back surface of the shutter base plate 201.

  The blade lever 208 and the main arm 204 rotate integrally around the shaft 201f of the shutter base plate.

  The blade lever 208 is provided with an engagement groove 208c.

  The blade lever 208 is formed with a protrusion 208d that comes into contact with a drive lever 211 described later.

  Reference numeral 214 denotes a locking member that is urged counterclockwise by a locking spring 250. The locking claw 214 a is inserted into the engagement groove 208 c of the blade lever 208 to lock the blade lever 208.

  Reference numeral 253 denotes an unlocking means composed of a stepping motor, for example, which rotates the locking member 214 counterclockwise against the locking spring 250 to release the locking of the blade lever 208 by the locking member 214.

  Reference numeral 211 denotes a drive lever, and the drive lever 211 is rotatably supported on a shaft 201 f of the shutter base plate 201.

  As shown in FIG. 10C, the drive lever 211 is formed with an armature holding portion 211a.

  A through hole 211b is formed in the armature holding portion 211a.

  At one end of the armature shaft 212a of the armature 212, a flange 212b having an outer diameter larger than the inner diameter of the through hole 211a is provided.

  The other end of the armature shaft 212a is loosely inserted into the through hole 211b of the drive lever 211, and after the armature 212 is attached to the armature shaft 212a, the other end of the armature shaft 212a is crimped.

  Between the armature 212 and the armature holding portion 211a, an armature spring 217, which is a compression spring, is disposed around the armature shaft 212a.

  The armature spring 217 applies an urging force in a direction to separate the armature 212 from the armature holding portion 211a.

  A hemispherical protrusion 211c is formed at a position facing the flange 212b of the armature holding portion 211a.

  The drive lever 211 is formed with a flat surface portion 211e that comes into contact with the protruding portion 208d of the blade lever 208.

  A drive spring 215 biases the drive lever 211 in the clockwise direction.

  Reference numeral 213 denotes a yoke, and 214 denotes a coil. The yoke 213 and the coil 214 form an electromagnet.

By energizing the coil 251 while the armature 212 and the yoke 213 are in contact with each other, the armature 212 and the yoke 213 are attracted and the drive lever 211 is held at the attracted position 216 is a charge lever. The standby position and the drive lever 211 are The charge lever driving device (not shown) moves between an overcharge position that charges against the biasing force of the drive spring 215 and holds the armature 212 and the yoke 213 at the overcharged position.

  Reference numeral 217 denotes a charge roller provided on the drive lever 211.

  8 and 9 are timing charts showing operation timings of the release button 130, the blade lever 208, the charge lever 216, the locking member 214, the coil 251, and the imaging element 3. FIG.

  The shutter unit operation from the state A shown in FIG. 8 to the state K will be described with reference to FIGS.

  8A is a live view state, and FIG. 11A is a front view showing a state of the shutter unit in the live view state. FIG. 11B is a rear view showing the state of the shutter unit in the live view state.

  The charge lever 216 is held at the overcharge position shown in FIG. 11A by a charge lever driving device (not shown).

  The cam portion 216a of the charge lever 216 contacts the charge roller 217 provided on the drive lever 211, and the drive lever 211 is held at a position where the armature 212 and the yoke 213 are overcharged.

  Since the drive lever 211 is held by the charge lever 216, the drive lever 211 is held at the position shown in the figure without energizing the coil 251.

  The locking claw 214 a of the locking member 214 is separated from the engagement groove 208 c of the blade lever 208, and the release of the blade lever 208 by the locking member 214 is released, and the sub arm 205 is driven by the urging force of the blade return spring 207. The main arm 204 and the blade lever 208 rotate counterclockwise, and the portion 208b of the blade lever 208 abuts on the portion 201h of the shutter base plate 201 and stops at a position where the blade group opens the opening 201a.

  There is a gap between the flat portion 211e of the drive lever 211 and the protrusion 208d of the blade lever 208.

  In the live view state, the subject image from the photographic lens unit passes through the shutter opening and forms an image on the image sensor. The imaged subject image is displayed on the rear monitor.

  Next, when the release button is pressed and SW2 is turned on (B), the shutter set release operation is performed, and the state transits to the energization holding state shown in FIG.

  FIG. 12 is a diagram illustrating a state of the shutter unit in the energization holding state.

  When the release button is pressed and SW2 is turned on, first, the coil 251 is energized in the state of A, and the armature 212 and the yoke 213 are attracted.

  The charge lever 216 is rotated counterclockwise from the state shown in FIG. 51 by a charge lever driving device (not shown) and is held at the standby position shown in the drawing.

  The drive lever 208 is rotated in the clockwise direction by the urging force of the drive spring 215 and is held at the position shown in the figure due to the attractive force of the armature 212 and the yoke 213.

  Since there is a gap between the protrusion 211e of the drive lever 211 and the protrusion 208d of the blade lever 208, the blade lever 211 and the blade group are maintained in the state shown in FIG.

  When the CPU 9 controls the image sensor driving circuit 8, the image sensor driving circuit 8 resets all the pixels of the image sensor 3 (FIG. 11 (4)). Specifically, the signals res_1 to res_n are set to the low level, the signals tx_1 to tx_n are set to the high level, and the PDs 41 of all the pixel units 20 in the first to nth rows are reset.

  Thereafter, the CPU 9 controls the image sensor driving circuit 8 so that the image sensor driving circuit 8 starts electronic front curtain scanning (FIG. 11 (5)). During the period from FIG. 11 (4) to FIG. 11 (5), the all-pixel reset state of the image sensor 3 is continued.

  Here, the electronic front curtain scanning refers to starting charge accumulation line by line with respect to the image sensor 3 in which all pixels are in a reset state. Specifically, the vertical scanning circuit 21 sequentially sets the signal tx_ * to the low level from the nth row to the first row. As a result, the reset of the PDs 41 in each row is sequentially released and enters the accumulation state.

  Since the scanning pattern for starting charge accumulation line by line is a scanning pattern that matches the running characteristics of the blade group 230, the uniform accumulation time (exposure time) is obtained for any line of the image sensor 3.

  Next, after the electronic front curtain scan is started, the blade is caused to travel to F after a time interval corresponding to the set shutter speed.

  8 is a traveling state of the blades, and FIG. 13 is a diagram illustrating a state of the shutter unit in the traveling state of the blade group.

  After starting the electronic front curtain scanning, after a time interval corresponding to the set shutter time, the shutter drive circuit 11 turns off the coil 251 and the armature 212 and the yoke 213 lose the attracting force, and the drive spring 215 The driving lever 211 rotates clockwise by the urging force.

  The flat portion 211e of the drive lever 211 and the protruding portion 208d of the blade lever 208 come into contact with each other, and the blade lever 208 rotates in the clockwise direction together with the drive lever 211.

  As the blade lever rotates, the sub arm 205 and the main arm 204 rotate clockwise, and the blade group moves from the state where the opening 201a is opened to the state where it is closed.

  The engagement claw 214a of the engagement member 214 is in contact with the cam surface 208e of the blade lever 208, and the state of H in FIG. 8 is a state where the blade group has completed traveling, and FIG. It is a figure which shows a state.

  The engaging portion 208a of the blade lever 208 abuts against a stopper rubber 218 provided on the shutter base plate and stops at the position shown in the figure.

  The locking claw 14 a of the locking member 214 enters the engagement groove 208 c of the blade lever 208 by the urging force of the locking spring 250 and locks the blade lever 208. The blade group is kept closed.

  The drive lever 211 is urged clockwise by the drive spring 215, the flat portion 211e of the drive lever 211 and the protrusion 208d of the blade lever 208 abut, and the drive lever is stopped at the position shown in the figure.

  When the traveling of the blade group of the shutter 2 is completed and the image sensor 3 is shielded from light, the CPU 9 controls the image sensor drive circuit 8 so that the image sensor drive circuit 8 starts the still image reading scan. In the still image readout scanning, the charge accumulated in the PD 41 of each pixel is sequentially read out from the first row by repeating the image signal readout operation for each row described in FIG. At this time, it is necessary to keep the light beam blocked in the area where the reading of the image signal is not completed.

  After a predetermined time from the running completion state (I), charging is started.

  J in FIG. 8 is the charge completion state, and FIG. 15 is a diagram illustrating the state of the shutter unit in the charge completion state.

  After a predetermined time from the travel completion state (I), the charge member 216 is rotated counterclockwise from the standby state of FIG. 14 by a charge lever driving device (not shown), and the cam portion 216a of the charge member 216 is charged with the charge roller of the drive lever 211. Abutting on 217, the drive lever 211 is rotated counterclockwise against the biasing force of the drive spring 215.

  When the cam portion 216a of the charge member 216 comes into contact with the charge roller 217 of the drive lever 211, the charge lever driving device (not shown) stops, and the drive lever 211 is a position where the armature 212 and the yoke 213 are overcharged by the charge member 216. Retained.

  The locking claw 14 a of the locking member 214 enters the engagement groove 208 c of the blade lever 208 by the urging force of the locking spring 250 and locks the blade lever 208. The blade group is kept closed.

  It is determined that the release button is pressed and SW2 is ON at time J in the charge completion state.

  If SW2 is ON, continuous shooting is performed, so shooting is continued. If SW2 is not ON, the process shifts to live view (described in FIG. 9).

  If SW2 is ON at J, the set is released, and the state shifts to the energization holding state.

  The state of K in FIG. 8 is the energization holding state, and FIG. 16 is a diagram showing the state of the shutter unit in the energization holding state.

  The coil 251 is energized in the state of FIG. 15 in the charge completion state, and the armature 212 and the yoke 213 are attracted.

  The charge lever 216 is rotated counterclockwise from the state shown in FIG. 15 by a charge lever driving device (not shown) and is held at the standby position shown in the drawing.

  The drive lever 211 is rotated in the clockwise direction by the urging force of the drive spring 215 and is held at the position shown in FIG.

  The locking claw 14 a of the locking member 214 enters the engagement groove 208 c of the blade lever 208 by the urging force of the locking spring 250 and locks the blade lever 208. The blade group is kept closed.

  After the shutter is energized and the reading of the charge of the image sensor is completed (L), the preliminary traveling of the blade is started.

  8 is a preliminary traveling state, and FIG. 17 is a diagram illustrating a state of the shutter unit in the preliminary traveling state.

  The drive lever is held in the energization holding state of FIG.

  The latch releasing means 253 rotates the locking member 214 clockwise, the locking claw 214a is separated from the engaging groove 208c, and the release of the blade lever 208 by the locking member 214 is released. Due to the urging force, the sub arm 5, the main arm 4 and the blade lever 208 rotate counterclockwise, and the blade group moves in a direction to open the opening 201a.

  The sub arm 205, the main arm 204, and the blade lever 208 are further rotated counterclockwise by the urging force of the blade return spring 207 from the state of M in FIG. The contact blade group stops at the position where it opens the opening 201a, and the preliminary traveling is completed at N in FIG.

  This state is the state of the sequence chart C, and since continuous shooting, the operations after C are repeated.

  If the release button is pressed in J and SW2 is not ON, shooting is stopped and the live view is entered.

  FIG. 9 shows a single-shot sequence. In single shooting, A to I are the same as the continuous shooting described above. The transition to the live view will be described after J. In J, the drive lever is held in the charge completion state of FIG. FIG. 18 is a diagram illustrating a state of the shutter unit in the preliminary traveling state.

  At O when the image pickup device has completed the charge reading, the locking release means 253 rotates the locking member 214 counterclockwise, the locking claw 214a moves away from the engagement groove 208c, and the locking member 214 locks the blade lever 208. To release.

  Due to the urging force of the blade return spring 207, the sub arm 205, the main arm 204 and the blade lever 208 rotate counterclockwise, and the blade group moves in the direction to open the opening 201a. Preliminary travel is completed at Q in FIG.

  The sub arm 205, the main arm 204, and the blade lever 208 are further rotated counterclockwise by the urging force of the blade return spring 207 from the state P in FIG. The contact blade group stops at the position where it opens the opening 201a, and the state shown in FIG. This state is the state of the sequence chart A and becomes a live view state.

202: Shutter blade group 208: Blade lever 214: Locking member 211: Drive lever

Claims (1)

A shutter blade group 202 that travels from a position to open an opening during exposure to a position to close;
A blade lever 208 coupled to the shutter blade group;
A blade return spring 207 that biases the blade lever in a direction in which the shutter blade group opens the opening;
A locking member 214 that locks the blade lever so that the shutter blade closes the opening against the biasing force of the blade return spring after the blade lever has traveled to close the opening;
Unlocking means 253 for unlocking the blade lever by the locking member;
A drive lever 211 that drives the blade lever in a direction in which the shutter blade closes the opening; a blade drive spring 215 that biases the drive lever in a direction in which the shutter blade closes the opening;
An armature 212 disposed on the drive lever;
A yoke 213 that attracts the armature by being energized;
A charge member 216 that charges the blade drive spring to contact the armature and the yoke and holds the previous drive lever in a predetermined position by moving the drive lever to a predetermined position;
Shutter 2 consisting of
First drive mode of the image sensor 3 and the shutter 2: After exposure, after the charge member moves the drive lever to the predetermined position, the charge member holds the drive lever in the predetermined position, and after the reading is finished, the blade is released by the release means Second drive mode for releasing the lock of the lever: After exposure, the charge member moves the drive lever to the predetermined position, then energizes the yoke to attract the armature, moves the charge lever to the standby position, and the yoke In an imaging device having a control device that holds the drive lever by adsorbing the armature and controls by releasing the locking of the blade lever by the release means after the reading is completed,
The control device controls the image sensor and the shutter device in a first drive mode during single shooting, and controls the image sensor and the shutter device in a second drive mode during continuous shooting.