JP2015225189A - Electronic imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic imaging apparatus capable of preventing damage to an SH blade or an imaging element caused by sunlight during power-off, in a structure in which a subject can be viewed through a finder while subject light is exposed by the imaging element.SOLUTION: A second light-shielding plate driving unit for driving a second light-shielding plate to a position for covering an SH unit opening is arranged on the undersurface of a mirror box. The second light-shielding plate is driven during power-off to prevent sunlight from being incident to an SH blade or an imaging element.

Description

  The present invention relates to an electronic imaging apparatus, and more particularly to an apparatus that divides imaging light by a reflecting member.

  Conventionally, a semi-transparent mirror is placed in the shooting optical path so that the subject can be confirmed with the image sensor while exposing the subject light, and part of the light is transmitted to the image sensor and the remaining light is reflected to the viewfinder. The structure to be made is proposed.

  In Patent Document 1, a light-shielding member having a semi-transparent mirror holding frame tip as a rotation axis is driven by a toggle spring to a position approaching the semi-transparent mirror holding frame at the mirror up position, and from the semi-transparent mirror holding frame at the mirror down position. A structure that is driven away is disclosed.

Japanese Patent Laid-Open No. 11-295810

  However, in the prior art disclosed in the above-mentioned patent document, sunlight can be incident through the semi-transmissive mirror even when the power is turned off, and if the sunlight is incident, there is a possibility that the SH blade and the image sensor are damaged. It was.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic image pickup apparatus that prevents damage to SH blades and an image sensor due to sunlight when the power is turned off in a configuration in which the subject can be confirmed with a viewfinder while exposing the subject light with the image sensor. That is.

To achieve the above object, according to the present invention, the semi-transparent mirror 203 is held in an electronic imaging apparatus that is rotatably provided with a semi-transparent mirror 203 that separates subject light into the imaging element and the other. A semi-transparent mirror holding frame 204 having an opening 204-f through which subject light passes, a mirror box 200 that rotatably holds the semi-transparent mirror holding frame 204, and a subject-side tip of the semi-transparent mirror holding frame 204 A first light shielding member 205 having a rotation center in the vicinity thereof, a biasing spring 206 that biases the first light shielding member 205 and the semi-transmissive mirror holding frame 204 in the opening direction by rotation, and a photographing optical axis on the inner wall of the mirror box A first convex portion 300 that protrudes to a position that can be brought into contact with the first light shielding member 205, and in the vicinity of the lower surface of the mirror box 200. A semi-transparent mirror holding frame 204 and a first light-shielding member 205 are disposed in a photographing light beam when waiting for photographing. The second light shielding member 401 is configured to be able to rotate and hold between one position (mirror down position) and a second position (mirror up position) retreated from the photographing light beam during photographing. Sometimes it is rotated between the first position (accommodated position) withdrawn from the photographing light flux and the second position (light-shielded position) where the subject light passing through the opening 204-f of the semi-transparent mirror holding frame 204 is shielded when the power is turned off. In the mirror down position, the transflective mirror holding frame 204 and the first light shielding member 205 are urged by the urging spring 206 in predetermined areas 204-e and 205-c. Contact Is held in position,
In the mirror-up position, the first light shielding member 205 is held in a state of being in contact with the first convex portion 300 provided on the inner wall of the mirror box in a region 205-d closer to the subject than the rotation center. Yes.

  According to the second aspect of the present invention, when the power OFF operation is performed in the first aspect, after the semi-transmissive mirror holding frame 204 and the first light shielding member 205 are driven to the mirror up position, After the light shielding member 401 is driven to the light shielding position and the second light shielding member 401 is driven to the light shielding position, the semi-transparent mirror holding frame 204 and the first light shielding member 205 are driven to the mirror down position. It is a feature.

  According to a third aspect of the present invention, in the first aspect, a notch shape is provided in the vicinity of the rotation axis of the second light shielding member 401.

  According to a fourth aspect of the present invention, in the first aspect, the tip width of the second light shielding member 401 is narrower than the width near the rotation center.

  According to a fifth aspect of the present invention, in the first aspect, the drive source for driving the second light shielding member 401 is disposed on the lower surface of the mirror box 200.

  According to a sixth aspect of the present invention, in the first and second aspects, the speed at which the semi-transmissive mirror holding frame 204 and the first light shielding member 205 are driven to the mirror-up position when the power is turned off is semi-transmissive at the time of photographing. The mirror holding frame 204 and the first light shielding member 205 are characterized by being slower than the speed at which they are driven to the mirror up position.

  According to the present invention, it is possible to prevent damage to the SH blade and the image sensor due to sunlight when the power is turned off even when the subject is exposed with the image sensor and the subject can be confirmed with the viewfinder. An electronic imaging device can be provided.

1A is a front perspective view of an electronic imaging apparatus to which the present invention is applied. FIG. (B) is a back side perspective view of the electronic imaging device to which the present invention is applied. It is a figure which has the flash device of the electronic imaging device to which this invention is applied in a use position. It is a block diagram of the electronic imaging device to which the present invention is applied. It is a perspective view of the mirror box unit to which the present invention is applied. It is a side view of the components in a mirror box and an image sensor to which the present invention is applied. It is the perspective view seen from the imaging | photography optical axis side of the mirror unit to which this invention is applied. It is the perspective view seen from the photographing optical axis reverse side of the mirror unit to which the present invention is applied. It is a down position side view of the mirror unit to which the present invention is applied. It is a side view near the up position of the mirror unit to which the present invention is applied. It is an up position side view of a mirror unit to which the present invention is applied. It is a down position side view of the mirror unit to which the present invention is applied. It is a side view near the up position of the mirror unit to which the present invention is applied. It is an up position side view of a mirror unit to which the present invention is applied. It is an up position side view of a mirror unit to which the present invention is applied. It is an up position side view of a mirror unit to which the present invention is applied. It is a perspective view which shows the mirror unit and 2nd light-shielding plate to which this invention is applied. (A) is a flowchart at the time of power-off of the electronic imaging device to which the present invention is applied. FIG. 6B is a flowchart when the electronic imaging apparatus to which the present invention is applied is turned on.

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

The outline of the operation of the digital single-lens reflex camera will be described below with reference to FIGS. FIG. 1 is an external perspective view of a digital single-lens reflex camera to which the present invention is applied.
FIG. 2 is an external perspective view of the flash unit of the digital single-lens reflex camera to which the present invention is applied moved to the light emitting position. FIG. 3 is a block diagram of the digital single-lens reflex camera in the present embodiment.

  In this embodiment, a digital single-lens reflex camera with a detachable lens is illustrated, but the present invention is not limited to this, and any imaging apparatus having a transflective mirror that can move between a photographing position and a photographing retreat position will be described. Applicable.

  As will be described later, the digital single-lens reflex camera according to the present embodiment does not include a so-called phase difference AF unit below the mirror box, and does not include a reflecting mirror for guiding subject light to the phase difference AF unit. The mirror unit 112 includes a semi-transmissive mirror, transmits a part of the subject light transmitted through the photographing optical system, guides it to an image sensor (not shown), and reflects the remaining subject light to the finder unit 113. The photographer can observe the subject light.

  When the main power switch 107 provided on the upper exterior cover 101 of the camera body 100 is operated to the ON position, the camera microcomputer 10 starts the camera in a predetermined sequence.

  When the operation microcomputer 12 detects the operation of the operation member by the operation detection circuit 12, the camera microcomputer 10 performs a corresponding setting. For example, when the shooting mode dial 108 is operated to select a shooting mode, a program diagram for determining a combination of shutter speed and aperture corresponding to the selected shooting mode is set. When the electronic dial 105 is operated, settings such as exposure correction are performed. When the ISO sensitivity setting button 106 is operated, an ISO sensitivity condition is set.

  A series of shooting operations when the automatic setting mode is selected with the shooting mode dial 108 will be described. When it is detected by the operation detection circuit 12 that the release button 104 has been pushed to the first position, the camera microcomputer 10 drives the shooting condition control circuit 13 to determine an appropriate shutter speed and aperture value. The subject light is measured by a photometric sensor (not shown) provided near the viewfinder unit 113. Alternatively, subject light that has passed through the semi-transmissive mirror and entered the image sensor may be measured.

  If it is determined from the obtained photometric result that the subject light is lower than the predetermined luminance, the camera microcomputer 10 drives the motor control circuit 14 and drives a motor (not shown) to move the flash unit 103 to the light emitting position. Then, it moves to a predetermined position by the rotational movement (position shown in FIG. 2).

  When it is detected by the operation detection circuit 12 that the release button 104 has been pushed to the second position, the camera microcomputer 10 drives the motor control circuit 14 so that the subject light reaches an image sensor (not shown), The mirror unit 112 is retracted to a predetermined position, and the flash control circuit 11 is driven to emit light at a predetermined timing and irradiate the subject with appropriate light.

  The camera microcomputer 10 drives the image sensor driving circuit 15 in a state where the subject light has reached the image sensor, and acquires the subject light as electronic data by photoelectric conversion. The acquired electronic data is subjected to predetermined data processing such as amplification, conversion, and correction by the data processing circuit 16 to become photographed image data.

  The camera microcomputer 10 drives the recording processing circuit 17 to record the obtained captured image data in a memory (not shown). When the photographer operates an image reproduction button (not shown), the camera microcomputer 10 drives the reproduction processing circuit 18 to display the photographed image stored in the memory on the display device 110 provided on the camera rear exterior cover 111.

  Reference numeral 109 denotes an accessory shoe, which can be connected to the attached external accessory by attaching an external accessory such as an external strobe and being connected to a circuit inside the camera at a contact portion.

  FIG. 4 is a perspective view of a mirror box unit of a digital single lens reflex camera to which the present invention is applied. A known mirror driving unit 201 for driving the mirror unit 112 is fixed to the side surface of the mirror box 200. The mirror drive unit 201 includes a motor, a gear (not shown), a spring, a mirror unit drive lever, and the like. A finder unit (not shown) is fixed to the upper part of the mirror box 200. The mirror unit 112 that reflects part of the subject light to the viewfinder unit includes a semi-transmissive mirror 203, a semi-transmissive mirror holding frame 204, a first light shielding plate 205, and a light shielding plate biasing spring 206. The semi-transmissive mirror 203 is fixed to the semi-transmissive mirror holding frame 204 with a double-sided tape (not shown). The fixing method of the semi-transparent mirror 203 to the semi-transparent mirror holding frame 204 may be any method as long as it has sufficient strength. An antireflection sheet 207, which is a known technique, is attached to the inner wall of the mirror box 200 to prevent harmful reflection light.

  The antireflection sheet 207 is not an essential component of the present invention, and it is desirable that an antireflection structure such as antireflection coating is adopted, but it may be provided if necessary. A second light shielding plate 401, which will be described later, is disposed on the lower surface of the mirror box 200, and is configured to be rotatable about the photographer side end. The mirror unit 112 collides with the shock absorbing member 208 and is held at the up position during photographing.

  FIG. 5 is a side view of the structure inside the mirror box and the image sensor. The semi-transparent mirror holding frame 204 to which the semi-transparent mirror 203 is fixed has a first position where the photographer observes the subject light (hereinafter referred to as a mirror down position) with the holding frame rotation axis 204-a as the rotation center and at the time of photographing. It is configured to be rotatable to a second position (hereinafter referred to as a mirror up position) retracted from the photographing light beam, and is configured to be held at the mirror down position and the mirror up position, respectively.

  The semi-transmissive mirror holding frame 204 is configured to be able to rotate and hold the mirror down position and the mirror up position by driving the drive shaft 204-b by a mirror unit drive lever (not shown) and a mirror unit drive spring. Yes. An up position driving pin 300 and a down-bound prevention pin 301 are provided on at least one of the inner side walls of the mirror box 200. The operation of the up position drive pin 300 and the downbound prevention pin 301 will be described later.

  The first light shielding plate 205 is made of a light and strong metal in order to reduce the influence on the operation of the mirror unit 112. Further, harmful light antireflection sheets 205-a and 205-b are attached to the front and back surfaces of the first light shielding plate 205 to reduce reflection of harmful light during focusing and photographing. The width of the front end of the first light-shielding plate 205 on the image sensor side only needs to be wide enough to cover the opening provided in the transflective mirror holding frame 204, and is narrower than the width near the rotation center. The load at the tip is reduced. The material may be anything as long as it does not affect the driving of the mirror unit 112. The antireflection sheet may also be an antireflection coating or an antireflection shape (for example, a continuous shape of a mountain valley).

  A light-shielding plate rotation shaft 204-c serving as a rotation center of the first light-shielding plate 205 is provided in the vicinity of the subject-side tip of the semi-transparent mirror holding frame 204, and the first light-shielding plate 205 is rotatably attached. . The first light shielding plate 205 is rotatable about the light shielding plate rotation axis with respect to the semitransparent mirror holding frame 204, and the rotation shaft 204-of the semitransparent mirror holding frame 204 together with the semitransmissive mirror holding frame 204. It is configured to be rotatable around a.

  The first light shielding plate 205 is urged by an urging spring 206 in a direction away from (opening) the semi-transmissive mirror holding frame 204. The biasing spring 206 has a winding portion disposed on the light shielding plate rotating shaft 204-c, one end abutting against the semi-transparent mirror holding frame 204, and the other end abutting against the first light shielding plate 205. The urging spring 206 may be in the vicinity of the light shielding plate rotating shaft 204-c on one side, but may be on both sides. When the mirror unit 112 is disposed at the mirror down position, the first light shielding plate 205 is held in a state of being separated (opened) from the semi-transmissive mirror holding frame 204 by the biasing force of the biasing spring 206 (FIG. 5). State).

  When the mirror unit 112 is disposed at the mirror down position, the subject light transmitted through the semi-transmissive mirror 203 can enter the image sensor 302 from the opening 204-f provided in the semi-transmissive mirror holding frame 204. It has become. At this time, if harmful light is reflected on the first light shielding plate 205, the image quality is deteriorated and the focusing accuracy is affected. However, the harmful light reflection preventing sheet 205-b can reduce harmful reflected light. . Further, when the mirror unit 112 is disposed at the mirror down position, the image quality obtained by the image sensor 302 is improved when subject light is incident between the subject-side tip of the semi-transmissive mirror holding frame 204 and the lower surface of the mirror box 200. However, since the first light shielding plate 205 blocks harmful light, it is possible to prevent the image quality obtained by the image sensor 302 from being deteriorated.

  Using the image data obtained from the image sensor 302, it is possible to perform a focusing operation by so-called contrast AF or imaging surface phase difference AF, which are known techniques. In addition, photometry can be performed using an image sensor or a dedicated photometer if provided.

  In the present invention, the subject light transmitted through the semi-transmissive mirror 203 is converted into an electrical signal by the image sensor 302 and a focusing operation is performed. Therefore, the phase difference AF unit conventionally provided on the lower surface of the mirror box 200 becomes unnecessary. Since image data is obtained by subject light transmitted through the opening 204-f of the semi-transparent mirror holding frame 204 at the mirror down position, a focusable range is determined by the size of the opening. The present invention is not particularly limited by the focusable range, but it is desirable that an opening size of 50% or more of the photographing size is provided because the focusable area is wide and the usability is good. When the size of the semi-transmissive mirror 203 is reduced, the size of the opening 204-f of the semi-transmissive mirror holding frame 204 is also reduced. Therefore, the larger the size of the semi-transmissive mirror 203 is, the more convenient for the photographer.

  FIG. 6 is a perspective view of the mirror unit 112. A mirror positioning abutment surface 204-d that abuts a mirror positioning portion 303 (see FIG. 7) provided on the inner surface of the mirror box 200 is provided on the side surface of the semi-transmissive mirror holding frame 204. The angle of the transmission mirror 203 is configured to be maintained at a predetermined angle. The front end of the translucent mirror holding frame 204 is in contact with the first light shielding plate 205, and the position of the first light shielding plate 205 in the separated (open) state is held by the biasing force of the biasing spring 206. A holding frame contact surface 204-e is provided for this purpose. As a corresponding part to the first light shielding plate 205, a light shielding plate contact surface 205-c is provided. The light shielding plate contact surface 205-c is provided as a different plane from the other areas of the first light shielding plate 205. This is to ensure the strength by securing the thickness of the tip of the semi-transmissive mirror holding 04. The positions other than the light shielding plate contact surface 205-c are set at positions that can be arranged as close to the semi-transmissive mirror holding 204 as possible at the mirror up position.

  In this embodiment, the light-shielding plate contact surface 205-c is a flat surface different from other regions. However, the present invention is not limited to this, and even at the same position, it is semi-transmissive at the mirror-up position. The opening 204-f of the mirror holding frame 204 may be covered.

  Near the rotation center of the first light shielding plate 205, a pin contact portion 205-d that contacts the up position drive pin 300 and the downbound prevention pin 301 is provided at a position that is substantially symmetrical with respect to the photographing optical axis. . The pin contact portion 205-d is provided on a wall portion 205-e provided to increase the strength provided on both side surfaces of the first light shielding plate 205. Further, the pin contact portion 205-d is provided as a surface extending in a direction farther from the photographing optical axis than the light shielding plate rotation shaft 204-c provided in the semi-transmissive mirror holding frame 204. In addition, although pin contact part 205-d is supposed to be provided in wall part 205-e, in this invention, it is not essential and may be provided from light-shielding plate contact surface 205-c. The surface on the finder side of the pin contact portion 205-d contacts the up position driving pin 300, and the surface on the opposite side of the finder contacts the downbound prevention pin 301. The urging spring 206 is disposed so as to abut on the finder side surface of the pin abutting portion 205-d.

  FIG. 7 is a side view showing the operation of the mirror unit 112. FIG. 7A is a mirror down position, and is a side view of FIG. 5 viewed from the reverse side. FIG. 7B is a side view showing the pin contact portion 205-d of the first light shielding plate 205 starting to contact the up position drive pin 300 or starting to separate. FIG. 7C shows the mirror up position which is the retracted state at the time of exposure. The operation of the mirror unit 112 will be described with reference to FIG.

  In the mirror down position, the semi-transmissive mirror holding frame 204 is held while maintaining a predetermined angle with the mirror positioning portion 303 and the positioning receiving surface 204-d being in contact with each other. The mirror positioning portion 303 has a shape that avoids interference with the wall portion 205-e of the first light shielding plate 205, but may be arranged so as not to interfere by changing the distance from the photographing optical axis. In that case, the wall 205-e of the first light shielding plate 205 is disposed at a position close to the photographing optical axis. The bounce prevention pin 301 and the pin contact portion 205-d of the first light shielding plate 205 are disposed at a predetermined distance away from each other, and are disposed without contact at the mirror down position. Thus, the photographer can correctly recognize the subject light reflected by the semi-transmissive mirror 203 through the finder optical system.

  The subject light transmitted through the semi-transmissive mirror 203 is incident on the image sensor 302, and the subject light is converted into an electrical signal, and a focusing operation is performed by a known technique. When the photographer operates the release button 104, focusing control and shooting condition setting are performed by the above-described camera operation. After the photographing becomes possible, the semi-transmissive mirror holding frame 204 is rotationally driven by a mirror driving lever (not shown) and starts moving to the mirror up position. The first light shielding plate 205 moves together with the semi-transmissive mirror holding frame 204, and the up position driving pin 300 and the pin contact portion 205-d of the first light shielding plate 205 start to contact each other before the mirror up position (FIG. 7). (State of (b)). The place where the up position drive pin 300 and the pin contact portion 205-d of the first light shielding plate 205 abut is closer to the subject than the center of rotation of the first light shielding plate 205, and the first light shielding plate 205 is The first light-shielding plate 205 is driven to approach (close) the semi-transparent mirror holding frame 204 by receiving a rotational driving force in a direction approaching (closing) the semi-transparent mirror holding frame 204 from the up position driving pin 300. . In the picture of the embodiment, the end of the biasing spring 206 on the first light shielding plate 205 side interferes with the first light shielding plate 205, but actually the pin contact portion 205-d and It arrange | positions in the position which the edge part contact | abutted in the position which contact | connects.

  When the semi-transmissive mirror holding frame 204 is driven to the mirror-up position by the mirror unit drive lever, the subject-side tip of the semi-transmissive mirror holding frame 204 collides with the impact interference member 208 and is held at a predetermined compression position (FIG. 7). (C) state). At this time, the first light shielding plate 205 is held in the closest (closed) state with respect to the semi-transmissive mirror holding frame 204 by the up position driving pin 300.

  After the mirror unit 112 is driven to the mirror up position, photographing data acquisition (exposure) is performed by the image sensor 302. At this time, the first light shielding plate 205 is held in a state of covering the opening 204-f of the semi-transparent mirror holding frame 204, and prevents harmful light from the viewfinder from reaching the image sensor 302. In addition, an antireflection sheet 205-a is attached to the photographing optical axis side to reduce reflection due to harmful light transmitted through the photographing optical system. This makes it possible to reduce harmful light from entering the subject light being exposed.

  When the semi-transparent mirror holding frame 204 is moved to the mirror down position after the exposure operation, the first light shielding plate 205 is photographed together with the semi-transmissive mirror holding frame 204 as the semi-transparent mirror holding frame 204 approaches the photographing optical axis. In order to approach the optical axis, it begins to move away from the up-position drive pin 300 and moves away from the semi-transparent mirror holding frame 204 by the biasing force of the biasing spring 206 (opens).

  When the mirror unit 112 moves to the mirror down position, the first light shielding plate 205 may bounce and approach the imaging optical axis. In the case of bouncing, the first light shielding plate 205 rotates about the rotation center axis 204-c of the semi-transparent mirror holding frame 204, and the first frame is connected to the holding frame contact portion 204-e of the semi-transparent mirror holding frame 204. The light-shielding plate contact portion 205-c of the light-shielding plate 205 is separated. However, the bounce prevention pin 301 and the pin abutment portion 205-d, which are provided with a predetermined gap between the pin abutment portion 205-d of the first light shielding plate 205, abut against each other to prevent bounce. It becomes possible. In this embodiment, the form using the bounce prevention pin 301 is described. However, the present invention is not limited to this, and it is not essential to provide the bounce prevention pin 301 when the bounce is small.

  FIG. 8 is a side view showing the mirror unit 112 and the second light shielding plate driving unit 400 showing the operation when the power source of the camera is turned off by the main power switch 107. FIG. 8A is a side view showing the mirror unit 112 and the second light-shielding plate driving unit 400 in a shooting standby state. The second light shielding plate driving unit 400 includes a light shielding plate driving motor 402, connecting gears 403 and 404, a second light shielding plate 401, a holding frame (not shown), and the like. The second light shielding plate driving unit 400 is disposed on the lower surface side of the mirror box 200, and is disposed in the space where the conventional phase difference AF unit is disposed.

  In the present embodiment, the above configuration is used. However, the present invention is not limited to this configuration, and any configuration that can drive the second light shielding plate 401 is applicable.

  FIG. 8B is a side view showing a state in which the mirror unit 112 is disposed at the mirror-up position after the photographer performs a power-off operation. FIG. 8C is a side view showing a state in which the mirror unit 112 is in the mirror up state and the second light shielding plate 401 is disposed at the light shielding position. FIG. 8D is a side view showing a state in which the second light shielding plate 401 is disposed at the light shielding position and the mirror unit 112 is disposed in the vicinity of the mirror down position. FIG. 8E is a side view showing a state in which the second light shielding plate 401 is disposed at the light shielding position and the mirror unit 112 is disposed at the mirror down position.

  When the photographer operates the main power switch 107 and the operation detection circuit 12 detects that the main power switch 107 is operated to the power OFF position, the camera microcomputer 10 causes the motor control circuit 14 to operate the motor of the mirror drive unit 201. And the mirror unit 112 is driven to the mirror up position (state shown in FIG. 8B). After the mirror unit 112 is driven to the mirror-up position, the camera microcomputer 10 drives the second light shielding plate driving motor 402 by the motor control circuit 14 to rotate the connecting gears 403 and 404 and the rotation shaft of the second light shielding plate 401. The second light-shielding plate 401 is driven to rotate by interlocking with the gear provided in 401-a. The second light shielding plate 401 is rotationally driven to the vicinity of the SH unit (not shown), and is disposed at a position covering the opening of the SH unit (not shown) (state shown in FIG. 8C). As shown in FIG. 9, a tip relief shape 401-c is provided at the tip of the second light shielding plate 401 so that the second light shielding plate 401 does not interfere with the vicinity of the rotation center of the semi-transparent mirror holding frame 204. It is configured.

  After the second light shielding plate 401 is arranged at a position covering the SH unit opening, the mirror unit 112 starts moving to the mirror down position. When the mirror unit 112 starts to move to the mirror down position, the first light shielding plate 205 is driven to a position away from the semi-transmissive mirror holding frame 204 by the biasing force of the biasing spring 206. The semi-transparent mirror holding frame 204 and the first light shielding plate 205 are opened to approach the mirror down position, and the photographer side tip of the first light shielding plate 205 approaches the second light shielding plate 401 (FIG. 8 ( d) state).

  As shown in FIG. 9, a root relief shape 401-b is provided near the rotation shaft 401-a of the second light shielding plate 401, and the tip of the first light shielding plate 205 and the second light shielding plate 401 interfere with each other. It is configured not to.

  When the mirror unit 112 is arranged at the mirror down position, the tip of the first light shielding plate 205 is held in a state where it enters the escape portion 401-b of the second light shielding plate 401 (the state shown in FIG. 8E). ).

  The second light-shielding plate 401 is arranged to cover the SH unit opening, and it is possible to prevent the sunlight that has passed through the semi-transmissive mirror 203 from entering the SH blade and the image sensor 302 (not shown).

  Next, the operation when the photographer operates the main power switch 107 and turns on the power will be described. In the power OFF state, the mirror unit 112 is held at the mirror down position, and the second light shielding plate 401 is disposed at a position covering the opening of the SH unit (state shown in FIG. 8E).

  When the main power switch 107 is operated by the photographer and the operation detection circuit 12 detects that the main power switch 107 is operated to the power ON position, the camera microcomputer 10 uses the motor control circuit 14 to turn on the motor of the mirror drive unit 201. Then, the mirror unit 112 is driven to the mirror up position (the state shown in FIG. 8C). After the mirror unit 112 is driven to the mirror up position, the camera microcomputer 10 drives the second light shielding plate driving motor 402 by the motor control circuit 14 and rotationally drives the second light shielding plate 401. The second light shielding plate 401 is rotationally driven to the storage position on the lower surface of the mirror box 200 (state shown in FIG. 8B). After the second light shielding plate 401 is rotationally driven to the storage position, the mirror unit 112 is driven to the mirror down position and enters a photographing standby state (the state shown in FIG. 8A).

  FIG. 10 is a flowchart when the power is turned on and off. FIG. 10A is a flowchart when the power is turned off. FIG. 10B is a flowchart when the power is turned on. The operations other than the second light shielding plate driving unit 400 are omitted because they are known sequences. The operation when the power is turned off will be described with reference to FIG. START is a shooting standby state.

  In STEP-A1, it is determined whether the main power switch 107 has been operated by the photographer. If it is determined that the main power switch 107 is not operated, the photographing standby state is maintained. If it is determined that the main power switch 107 has been operated, the mirror unit 112 is driven to the mirror up position in STEP-A2. The drive speed of the mirror unit 112 at this time is driven at a speed slower than the drive speed of the mirror unit 112 during normal photographing. When the mirror unit 112 is driven at a low speed, it is possible to reduce the sound generated at the time of driving and to perform an operation without a sense of incongruity. However, priority may be given to shortening the time until the power is turned off, and the mirror unit 112 may be driven at the driving speed during normal photographing.

  After the mirror unit 112 is driven to the mirror up position, in STEP-A3, the second light shielding plate 401 is driven by the large light shielding plate drive motor 402 from the storage position to a position covering the SH unit opening. After the second light shielding plate 401 is driven to a position that covers the SH unit opening, the mirror unit 112 is driven to the mirror down position in STEP-A4. The drive speed of the mirror unit 112 at this time is driven at a speed slower than the drive speed of the mirror unit 112 during normal photographing. When the mirror unit 112 is driven at a low speed, it is possible to reduce the sound generated at the time of driving and to perform an operation without a sense of incongruity. However, priority may be given to shortening the time until the power is turned off, and the mirror unit 112 may be driven at the driving speed during normal photographing. After the mirror unit 112 is driven to the mirror down position, the power of the camera is turned off in a predetermined sequence (STOP).

  The operation when the power is turned on will be described with reference to FIG. START is a power-off state. In STEP-B1, it is determined whether the photographer has operated the main power switch 107. When it is determined that the main power switch 107 has not been operated, the power OFF state is maintained. If it is determined that the main power switch 107 has been operated, the mirror unit 112 is driven to the mirror up position in STEP-B2. The drive speed of the mirror unit 112 at this time is equal to the drive speed of the mirror unit 112 during normal shooting. By driving the mirror unit 112 at a speed equivalent to that during normal shooting, it is possible to minimize delay in the start-up time, and it is possible to perform an operation without a sense of incongruity. However, it may be driven at a speed slower than the driving speed of the mirror unit 112 at the time of normal photographing in preference to reducing the generated sound.

  After the mirror unit 112 is driven to the mirror up position, the second light shielding plate 401 is rotationally driven to the storage position by the second light shielding plate driving motor 402 in STEP-B3. After the second light shielding plate 401 is driven to the storage position, the mirror unit 112 is driven to the mirror down position in STEP-B4. The drive speed of the mirror unit 112 at this time is equal to the drive speed of the mirror unit 112 during normal shooting. By driving the mirror unit 112 at a speed equivalent to that during normal shooting, it is possible to minimize delay in the start-up time, and it is possible to perform an operation without a sense of incongruity. However, it may be driven at a speed slower than the driving speed of the mirror unit 112 at the time of normal photographing in preference to reducing the generated sound. After the mirror unit 112 is driven to the mirror down position, the camera is turned on in a predetermined sequence.

  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.

100 camera body, 101 top exterior cover, 102 front exterior cover,
103 flash unit, 104 release button, 105 electronic dial,
106 ISO sensitivity setting button, 107 Main power switch,
108 shooting mode dial, 109 accessory shoe, 110 display device,
111 Rear exterior cover, 112 Mirror unit, 113 Viewfinder unit,
200 mirror box, 201 mirror drive unit,
202 photographing optical system communication unit, 203 transflective mirror,
204 semi-transparent mirror holding frame, 204-a semi-transparent mirror holding frame rotation axis,
204-b transflective mirror holding frame drive shaft, 204-c light shielding plate rotation shaft,
204-d mirror positioning member contact surface, 204-e holding frame contact surface,
204-f transflective mirror holding frame opening, 205 light shielding plate, 205-a antireflection sheet,
205-b antireflection sheet, 205-c light shielding plate contact surface, 205-d pin contact surface,
205-e light shielding plate wall portion, 206 biasing spring, 207 antireflection sheet,
300 up position drive pin, 301 bounce prevention pin, 302 image sensor,
303 mirror positioning unit, 400 second light shielding plate driving unit,
401 2nd light shielding plate, 401-a The rotating shaft of a 2nd light shielding plate,
401-b Shading plate relief shape of the second shading plate,
401-c Translucent mirror holding frame relief shape of the second light shielding plate,
402 2nd light shielding plate drive motor, 403 gear, 404 gear

Claims (6)

In an electronic imaging device that is rotatably provided with a semi-transmissive mirror (203) that separates subject light into an imaging element and the other,
A semi-transmissive mirror holding frame (204) that holds the semi-transmissive mirror (203) and has an opening (204-f) through which subject light passes;
A mirror box (200) for rotatably holding the transflective mirror holding frame (204);
A first light-shielding member (205) having a center of rotation near the subject-side tip of the semi-transmissive mirror holding frame (204);
An urging spring (206) for urging the first light shielding member (205) and the semi-transparent mirror holding frame (204) in a direction to open by rotation;
A first convex part (300) projecting at a position on the inner wall of the mirror box above the photographic optical axis and capable of contacting the first light shielding member (205);
A second light-shielding member (401) disposed in the vicinity of the lower surface of the mirror box (200) and in the vicinity of the image pickup device side end of the mirror box (200), and a semi-transparent mirror holding frame ( 204) and the first light shielding member (205) are a first position (mirror down position) disposed in the photographing light beam during photographing standby and a second position (mirror up position) retracted from the photographing light beam during photographing. And can be rotated and held,
The second light shielding member (401) passes through the first position (accommodation position) retracted from the imaging light beam during imaging standby and the opening (204-f) of the semi-transmissive mirror holding frame (204) when the power is turned off. It is configured to be rotatable and holdable to a second position (light-shielding position) that shields subject light,
In the mirror down position, the semi-transmissive mirror holding frame (204) and the first light shielding member (205) are brought into contact with each other in a predetermined region (204-e, 205-c) by the urging force of the urging spring (206). Held in position,
At the mirror up position, the first light blocking member (205) is held in contact with the first convex portion (300) provided on the inner wall of the mirror box in the region (205-d) closer to the subject than the center of rotation. An electronic imaging apparatus characterized in that: When the power is turned off, the translucent mirror holding frame (204) and the first light shielding member (205) are driven to the mirror up position, and then the second light shielding member (401) is driven to the light shielding position. After the second light shielding member (401) is driven to the light shielding position, the transflective mirror holding frame (204) and the first light shielding member (205) are driven to the mirror down position. The electronic imaging device according to claim 1. The electronic imaging device according to claim 1, wherein a notch shape is provided in the vicinity of the rotation axis of the second light shielding member (401). The electronic imaging apparatus according to claim 1, wherein the tip width of the second light shielding member (401) is narrower than the width near the rotation center. The electronic imaging apparatus according to claim 1, wherein a drive source for driving the second light shielding member (401) is disposed on a lower surface of the mirror box (200). The speed at which the semi-transparent mirror holding frame (204) and the first light-shielding member (205) are driven to the mirror-up position when the power is OFF is such that the semi-transparent mirror holding frame (204) and the first light-shielding member (205) at the time of photographing. The electronic imaging apparatus according to claim 1, wherein the speed is lower than a speed at which the lens is driven to the mirror-up position.