JP2007195012A - Electronic camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic camera which stops a moving picture photographing in a mirror down state when the moving picture photographing can not be continued. <P>SOLUTION: A main mirror 11 of a single lens reflex electronic camera is surely subjected to mirror down at a position A when the photographing is stopped. When a photographic lens 50 is removed from a camera body 10, a system control part determines that it is impossible to continue moving picture photographing and stops moving picture photographing. When a residual photographing time of a recording medium runs out, the system control part determines that it is impossible to continue moving picture photographing and stops moving picture photographing. In addition, when a residual photographing time of the recording medium becomes smaller than one minute, the system control part makes an external liquid crystal display 17 perform display (flickering of residual photographing time) showing such a state that it is impossible to continue moving picture photographing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic camera that acquires an electronic image.

  A technique for taking a moving image with a single-lens reflex electronic camera is known (see Patent Document 1). According to Japanese Patent Application Laid-Open No. 2004-133620, in an electronic camera for taking a still image, a quick return mirror is rotated according to a shooting start operation, and the position of the mirror is retracted from the optical path of a subject light beam (mirror up) Thus, the image sensor is exposed. The position of the quick return mirror is returned to the optical path after the exposure (mirror down). In the case of moving image shooting, the electronic camera is kept in a mirror-up state according to the shooting start operation until the shooting stop operation is performed. An operation for stopping moving image shooting in the mirror-up state and an operation for stopping moving image shooting after the mirror is lowered can be selected by setting.

JP 2004-109831 A

  Japanese Patent Application Laid-Open No. 2004-228561 only discloses an operation for stopping moving image shooting after a shooting stop operation is performed, and quick return when it is impossible to continue moving image shooting before the shooting stop operation is performed. There is no disclosure regarding the control of the mirror, which may cause inconvenience.

An electronic camera according to the present invention allows an image sensor that captures an optical image from a photographic optical system, a first position that prohibits the optical image from being guided to the image sensor, and allows the optical image to be guided to the image sensor. A mirror member that moves between the second position and the determination unit that determines a state in which it is impossible to continue moving image capturing in which the imaging element repeats imaging while the mirror member is positioned at the second position. And a control means for moving the mirror member to at least the first position and stopping the moving image shooting when the determining means determines a state incapable of continuing during moving image shooting.
In the electronic camera according to claim 1, the determination unit can also determine based on an external operation.
In the electronic camera according to claim 1, the determination unit may perform determination based on a factor inside the camera.
4. The electronic camera according to claim 3, further comprising display means for displaying that the determination means has determined that it cannot continue before the mirror member control means moves the mirror member to the first position. May be.
In the electronic camera according to claim 4, when the determination unit makes a determination according to a decrease in the remaining capacity of the recording medium, it is preferable that the display unit displays an expected moving image shooting time corresponding to the remaining capacity.
5. The electronic camera according to claim 4, wherein when the determination unit makes a determination according to a decrease in the remaining capacity of the battery, the control unit leaves a capacity necessary for moving the mirror member to the first position. It is preferable to stop moving image shooting.

  According to the present invention, it is possible to provide an electronic camera that stops moving image shooting in a mirror-down state when it is impossible to continue moving image shooting.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a single-lens reflex electronic camera according to an embodiment of the present invention. In FIG. 1, a replaceable photographic lens 50 is attached to the camera body 10 via a lens mount 30. The taking lens 50 includes a lens optical system 51, a focus motor 52, and an aperture unit 53.

  Light from the subject enters the camera body 10 via the lens optical system 51 of the photographing lens 50 and the aperture unit 53. The focus motor 52 drives the focus lens back and forth in the optical axis direction (left and right direction in the figure) in accordance with a focus adjustment signal from the camera body 10.

  The camera body 10 includes a main mirror 11, a sub mirror 12, a distance measuring unit 13, a shutter 14, an optical filter 15, an image sensor 16, an external liquid crystal 17, a pentaprism 18, a finder liquid crystal 19, It has a photometric unit 20 and an eyepiece optical system 21.

  The subject luminous flux incident on the camera body 10 from the photographic lens 50 is guided upward by a quick return mirror (hereinafter referred to as a main mirror) 11 positioned on the optical path L (position A) before being released, and is a diffusion screen (not shown). ) And a part of the subject light beam is reflected downward by the sub-mirror 12 and forms an image on the distance measuring unit 13 as well. The subject light beam formed on the diffusion screen is further incident on the pentaprism 18. The pentaprism 18 guides the incident subject light flux to the eyepiece optical system 21, and also guides a part thereof to the photometry unit 20.

  After the release, the main mirror 11 rotates upward and retracts to the outside of the optical path (position B), and the subject light flux is guided to the imaging element 16 for photographing through the shutter 14. An optical filter 15 that removes unnecessary spatial frequency components is disposed on the imaging surface of the imaging element 16.

  An external liquid crystal display (referred to as an external liquid crystal) 17 reproduces and displays captured images. A finder liquid crystal display (referred to as finder liquid crystal) 19 displays information shown in the finder. The half mirror 22 combines display light from the finder liquid crystal 19 with a subject light beam guided to the eyepiece optical system 21. Thus, the subject image and the display information in the viewfinder can be observed through the eyepiece optical system 21.

  FIG. 2 is a block diagram illustrating the configuration of the single-lens reflex electronic camera of FIG. The system control unit 101 is configured by a microcomputer or the like. The system control unit 101 receives a signal output from each block described later, performs a predetermined calculation, and outputs a control signal based on the calculation result to each block.

  The half-press switch SW1 and the full-press switch SW2 each output an ON signal to the system control unit 101 in conjunction with a pressing operation of a release button (not shown). The ON signal from the switch SW1 is output when the release button is pressed down to about half of the normal stroke, and the output is canceled when the half stroke is pressed down. The ON signal from the switch SW2 is output when the release button is pushed down to the normal stroke, and the output is released when the normal stroke push-down operation is released.

  The moving image / still image selection operation member 105 outputs a mode selection signal for moving image shooting mode or still image shooting mode to the system control unit 101 in accordance with the selection operation. The shooting information setting operation member 104 outputs setting signals for imaging sensitivity (ISO sensitivity) and exposure calculation mode (program auto, aperture priority auto, shutter speed priority auto, etc.) to the system control unit 101 in accordance with the setting operation.

  The photometric control calculation unit 103 (corresponding to the photometric unit 20 in FIG. 1) calculates the subject luminance using the detection signal from the photometric sensor. The photometric control calculation unit 103 further performs a known exposure calculation using the set imaging sensitivity, lens information described later, and the calculated subject luminance, and determines the control exposure. The exposure calculation mode is performed in an exposure calculation mode corresponding to a setting signal from the photographing information setting operation member 104.

  The distance measurement control calculation unit 102 (corresponding to the distance measurement unit 13 in FIG. 1) detects the focus adjustment state (defocus amount) by the photographing lens 50 using the detection signal from the distance measurement sensor, and focuses according to the detection result. The amount of lens movement is calculated. A signal indicating the amount of movement of the focus lens is transmitted to the photographing lens 50 via the system control unit 101 and the communication interface 106.

  The communication interface 106 communicates with the communication interface 505 on the photographic lens 50 side that is attached to the lens mount 30. Through communication between the camera body 10 and the photographing lens 50, lens information such as an aperture value and lens data is transmitted from the photographing lens 50 to the camera body 10, while lens control information such as the movement amount of the focus lens and an operation command is received. It is transmitted from the camera body 10 to the taking lens 50.

  A shutter control unit 107 performs charge and drive control of a shutter device (not shown) according to an instruction sent from the system control unit 101. In response to an instruction sent from the system control unit 101, the mirror control unit 108 drives the mirror up (retracts to the position indicated by position B in FIG. 1) and drives the mirror down (at position A in FIG. 1). Controls driving (returning to the indicated position).

  The power supply unit 109 is turned on / off according to an instruction from the system control unit 101, and supplies power to each part of the camera body 10 and the photographing lens 50 when turned on. The system control unit 101 is configured to be always supplied with power when a battery (not shown) is loaded, regardless of whether the power supply unit 109 is on or off.

  The image sensor 16 is constituted by a CCD image sensor, for example. The image sensor 16 captures a subject image guided from the photographing lens 50 and outputs an image signal to the AFE circuit 113. The image sensor 16 is driven at a predetermined operation timing by a drive signal output from the driver circuit 114. An AFE (Analog Front End) circuit 113 includes an A / D conversion circuit, performs analog processing (gain control, etc.) on the photoelectric conversion signal (accumulated charge) output from the image sensor 16, and analog image signal after analog processing Is converted to a digital signal.

  The image processing unit 112 is configured by an ASIC or the like. The image processing unit 112 performs image processing such as white balance processing on the digitally converted image data in accordance with an instruction from the system control unit 101, and compresses the image data after image processing in a predetermined format. For example, decompression processing is performed to decompress the image data. The image processing unit 112 generates display data to be displayed on the external liquid crystal 17 and the finder liquid crystal 19. The external liquid crystal 17 displays a captured image that has been subjected to image processing by the image processing unit 112. The finder liquid crystal 19 displays shooting information such as the set exposure calculation mode, imaging sensitivity, shutter speed, and aperture value.

  The recording medium 60 is configured by a data storage member such as a memory card, for example. The image recording unit 111 can store captured image data in the recording medium 60 and read out data stored in the recording medium 60 according to an instruction from the image processing unit 112. The remaining capacity calculation unit 110 calculates the free capacity (referred to as remaining capacity) of the recording medium 60 that can newly store data.

  The imaging control unit 115 instructs the driver circuit 114 to switch the drive signal. Accordingly, the driver circuit 114 supplies a drive signal for moving image shooting to the image sensor 16 at the time of moving image shooting and a drive signal for still image shooting at the time of still image shooting. The imaging control unit 115 further manages recording and reading of data with respect to an image buffer memory (hereinafter referred to as an image buffer) 116 described later. By temporarily storing the image data before the image processing by the image processing unit 112, after the image processing, and during the image processing in the image buffer 116, the processing for the captured image data of the previous frame is awaited. Without being configured, the next frame can be imaged.

  The lens control unit 501 instructs the focus drive control unit 504 to drive the focus motor 52 (FIG. 1) based on lens control information input from the camera body 10 via the communication interface 505. The lens control unit 501 transmits aperture position information from an aperture control unit 503 (to be described later) and lens data stored in the lens data storage unit 502 to the camera body 10 as lens information.

  A focus drive control unit 504 drives the focus motor 52 to drive the focus lens back and forth in the optical axis direction. Thereby, the photographing lens 50 is focused on the main subject. The aperture control unit 503 drives the aperture of the aperture unit 53 (FIG. 1) according to an instruction from the camera body 10 side, detects the position of the aperture, and sends a detection signal to the camera via the lens control unit 501. Output to the body 10 side. The aperture control unit 503 has an aperture locking device (not shown), locks the aperture being driven in accordance with an instruction from the camera body 10 side, and stops the aperture driving at a predetermined aperture value.

  The lens data storage unit 502 stores data indicating the characteristics (open F value, focal length, etc.) of the lens optical system 51 in advance, and can be read out in response to a request from the camera body 10 side.

Processing of the camera operation performed by the system control unit 101 of the single-lens reflex electronic camera described above will be described with reference to the flowcharts of FIGS.
<Still image shooting>
When a main switch (not shown) of the single-lens reflex electronic camera is turned on and the system control unit 101 instructs the power supply unit 109 to turn on, the program is started. When the mode selection signal to the still image shooting mode is input from the moving image / still image selection operation member 105, the system control unit 101 starts the still image shooting process shown in FIG.

  In step S301 in FIG. 3, the system control unit 101 instructs the distance measurement control calculation unit 102 to perform focus measurement. Specifically, the movement amount of the focus lens necessary for focusing is calculated based on the defocus amount, and the process proceeds to step S302.

  In step S302, the system control unit 101 instructs the photometry control calculation unit 103 to measure the subject luminance, and the process proceeds to step S303. In step S303, the system control unit 101 instructs the photometry control calculation unit 103 to calculate the photographing control value, and the process proceeds to step S304. The metering control calculation unit 103 performs an exposure calculation in the set exposure calculation mode, and determines a control shutter speed and a control aperture value at the time of shooting.

  In step S304, the system control unit 101 determines whether or not the half-press switch SW1 is on. When the ON signal is input from the half-press switch SW1, the system control unit 101 makes an affirmative determination in step S304 and proceeds to step S305. If the ON signal is not input, the system control unit 101 makes a negative determination in step S304. Return to S301.

  In step S305, the system control unit 101 instructs the photographing lens 50 to drive the lens. Specifically, lens control information for moving the focus lens to the in-focus position is transmitted to the photographing lens 50 via the communication interface 106.

  In step S306, the system control unit 101 determines whether the in-focus state has been achieved. When the defocus amount detected by the distance measurement control calculation unit 102 is equal to or smaller than the predetermined amount, the system control unit 101 makes an affirmative determination in step S306 and proceeds to step S307, and when the defocus amount exceeds the predetermined amount. Makes a negative determination in step S306 and returns to step S301. The defocus amount detection by the distance measurement control calculation unit 102 is configured to be performed in parallel while the focus lens is being driven.

  In step S307, the system control unit 101 instructs the taking lens 50 to stop driving the lens, and the process proceeds to step S308. In the present embodiment, the lens drive is stopped until the half-push switch SW1 is turned on again after being turned off, and the in-focus state is maintained (AF lock).

  In step S308, the system control unit 101 instructs the photometry control calculation unit 103 to measure the subject luminance, and the process proceeds to step S309. In step S309, the system control unit 101 instructs the photometry control calculation unit 103 to calculate the photographing control value, and the process proceeds to step S310.

  In step S310, the system control unit 101 determines whether or not the full push switch SW2 is on. The system control unit 101 makes an affirmative determination in step S310 when an on signal is input from the full-press switch SW2, and proceeds to step S312. If an on signal is not input, the system control unit 101 makes a negative determination in step S310. Return to S308.

  In step S312, the system control unit 101 controls the shooting operation and proceeds to step S313. Specifically, the main mirror 11 is retracted to the outside of the optical path (position B), the photographing lens 50 is instructed to narrow the aperture to the control aperture value, the image sensor 16 starts the accumulation operation, and the shutter control unit 107 is instructed. Open the shutter. Further, the system control unit 101 closes the shutter after the exposure time corresponding to the control shutter speed has elapsed, causes the image sensor 16 to finish the accumulation operation, and causes the image sensor 16 to output an image signal (image capture). The captured image data is subjected to image processing and compression processing and recorded on the recording medium 60. In addition, the photographed image is displayed on the external liquid crystal 17.

  After the shutter is closed, in parallel with the image processing, the main mirror 11 is returned to the optical path (position A), the photographing lens 50 is instructed to return the aperture to the open value, and preparation for the next shutter drive is performed. For this purpose, the shutter is charged.

  In step S313, the system control unit 101 causes the remaining capacity calculation unit 110 to calculate the remaining storage capacity of the recording medium 60, and proceeds to step S314. The remaining storage capacity calculation instruction is sent via the image processing unit 112. In step S314, the system control unit 101 determines whether the recording medium 60 is full. If the remaining storage capacity is less than the capacity necessary for recording a new captured image (still image), the system control unit 101 makes a positive determination in step S314 and proceeds to step S316. On the other hand, if the remaining storage capacity is larger than the capacity necessary for recording a new captured image (still image), the system control unit 101 makes a negative determination in step S314 and proceeds to step S315.

  In step S315, the system control unit 101 causes the finder liquid crystal 19 to display the number of shots (number of shot images recorded on the recording medium 60) and the remaining number of shots (number of shot images newly recordable on the recording medium 60). 3 is terminated. A display instruction to the finder liquid crystal 19 is sent via the image processing unit 112.

  In step S316, the system control unit 101 causes the finder liquid crystal 19 to perform a full display (display indicating that the remaining storage capacity of the recording medium 60 is insufficient), and the processing in FIG. A display instruction to the finder liquid crystal 19 is sent via the image processing unit 112.

<Video shooting>
When the mode selection signal to the moving image shooting mode is input from the moving image / still image selection operation member 105, the system control unit 101 starts moving image shooting processing shown in the flowchart of FIG. The single-lens reflex electronic camera of this embodiment starts moving image shooting when the full push switch SW2 is turned on while the moving image shooting mode is selected, and starts moving image shooting when the full push switch SW2 is turned on again after the full push switch SW2 is turned off. Stop. Since each process of step S401 to step S410 in FIG. 4 is the same as each process of step S301 to step S310 described above, description thereof will be omitted.

  In step S411, which proceeds after making an affirmative determination in step S410, the system control unit 101 controls the photographing operation and proceeds to step S412. Specifically, the AF lock is released, the main mirror 11 is retracted to the outside of the optical path (position B), the photographing lens 50 is instructed to narrow the aperture to the control aperture value, and the image sensor 16 starts the accumulation operation. Then, the shutter control unit 107 opens the shutter. The exposure time control in moving image shooting is performed by accumulation time control (so-called electronic shutter control). The accumulation time and the control aperture value are feedback-controlled using the result of luminance measurement (step S412) using an imaging signal described later.

  The system control unit 101 further outputs an imaging signal from the imaging device 16 every time the accumulation time of one frame elapses (image capture), performs image processing and compression processing on the captured image data, and records them on the recording medium 60. Let In addition, the photographed image is displayed on the external liquid crystal 17. Thereby, a frame image is repeatedly photographed, recorded on the recording medium 60, and displayed on the external liquid crystal 17.

  In step S412, the system control unit 101 performs photographed image luminance measurement and proceeds to step S413. Since the subject light is not guided to the photometry unit 20 during moving image shooting, the subject luminance is calculated using the image pickup signal from the image pickup device 16.

  In step S413, the system control unit 101 performs video feedback AF control. Specifically, focus adjustment is performed by a focus detection method called a hill climbing method. The system control unit 101 detects the in-focus position so that the focus evaluation value takes the maximum value while driving the focus lens forward / backward in the optical axis direction and the data based on the high-frequency component of the image pickup signal captured from the image pickup device 16. To do.

  In step S414, the system control unit 101 causes the remaining capacity calculation unit 110 to calculate the remaining storage capacity of the recording medium 60, and proceeds to step S415. The remaining capacity calculation instruction is sent via the image processing unit 112. In step S415, the system control unit 101 determines whether the remaining photographing time is 1 minute or longer. The remaining shooting time (expected moving image shooting time) is calculated using, for example, the remaining storage capacity and the compression bit rate by the image processing unit 112. If the remaining storage capacity is equal to or larger than the capacity necessary for recording a moving image taken for one minute, the system control unit 101 makes an affirmative decision in step S415 and proceeds to step S416. On the other hand, if the remaining storage capacity is less than the capacity required for recording a moving image taken for one minute, the system control unit 101 makes a negative determination in step S415 and proceeds to step S417.

  In step S417, the system control unit 101 determines whether there is no remaining. If the remaining storage capacity is less than the capacity required for recording a new captured image (moving image), the system control unit 101 makes an affirmative decision in step S417 and proceeds to step S419. If the determination in step S417 is affirmative, it is considered that moving image shooting cannot be continued. On the other hand, if the remaining storage capacity is larger than the capacity necessary for recording a new captured image (moving image), the system control unit 101 makes a negative determination in step S417 and proceeds to step S418. When a negative determination is made in step S417, it is considered that moving image shooting can be continued.

  In step S416, the system control unit 101 displays the remaining photographing time on the external liquid crystal 17 so as to proceed to step S420. In this case, the remaining shooting time is sequentially updated as the moving image shooting proceeds. The remaining shooting time is displayed, for example, as an overlay on the shot image.

  In step S418, the system control unit 101 causes the external liquid crystal 17 to blink the remaining photographing time and proceeds to step S420. Also in this case, the remaining shooting time is sequentially updated as the moving image shooting proceeds. The remaining shooting time is displayed, for example, as an overlay on the shot image.

  In step S419, the system control unit 101 turns on and displays a full display (display indicating that the remaining storage capacity of the recording medium 60 is insufficient) on the external liquid crystal 17, and proceeds to step S424. In the full display, for example, an overlay display is made on the captured image.

  In step S420, the system control unit 101 determines whether or not the full press switch SW2 is turned on again. If the full-press switch SW2 is turned on again after turning off, the system control unit 101 makes an affirmative decision in step S420 and proceeds to step S423, and if not turned on again, makes a negative decision in step S420 and proceeds to step S421. .

  In step S <b> 421 that proceeds when the full-press switch SW <b> 2 is not turned on again, the system control unit 101 determines whether the taking lens 50 is removed. If communication with the taking lens 50 is not established, the system control unit 101 determines that the lens has been removed (Yes in step S421), and proceeds to step S424. If the determination in step S421 is affirmative, it is considered that moving image shooting cannot be continued. If communication with the taking lens 50 is established, the system control unit 101 makes a negative determination in step S421 and returns to step S411. When a negative determination is made in step S421, it is considered that moving image shooting can be continued.

  In step S423, which proceeds when the full-press switch SW2 is turned on again, the system control unit 101 determines whether or not a change operation to the still image shooting mode has been performed. When the mode selection signal to the still image shooting mode is input from the moving image / still image selection operation member 105, the system control unit 101 makes a positive determination in step S423 and proceeds to step S425 to select the mode for moving image shooting mode. If a signal is input, a negative determination is made in step S423, and the process proceeds to step S422. The negative determination in step S423 is a case where a normal moving image shooting stop operation is performed in the moving image shooting mode.

  In step S422, the system control unit 101 causes the photographing lens 50 to stop driving the lens, and proceeds to step S424.

  In step S424, the system control unit 101 causes the shutter control unit 107 to close the shutter, causes the image sensor 16 to stop the accumulation operation (imaging), and returns the main mirror 11 to the optical path (position A) after the shutter is closed. Then, the photographing lens 50 is instructed to return the aperture to the open value, the shutter is charged in preparation for the next shutter drive, and the process shown in FIG. 4 ends.

  The process proceeds to step S425 when the operation for changing to the still image shooting mode is performed during moving image shooting. In this case, the system control unit 101 immediately shifts to the still image shooting mode in response to the full-press switch SW2 being turned on again (step S420). In step S425, the lens driving of the taking lens 50 is stopped, and the process proceeds to step S426.

  In step S426, the system control unit 101 closes the shutter, stops the image pickup device 16 from accumulating (imaging), and after closing the shutter, returns the main mirror 11 to the optical path (position A) and opens the aperture. The photographing lens 50 is instructed to return to the value, the shutter is charged for preparation for the next shutter driving, the processing in FIG. 4 is terminated, and the process proceeds to step S301 in FIG. 3 (still image photographing processing).

According to the embodiment described above, the following operational effects can be obtained.
(1) When the main mirror 11 of the single-lens reflex electronic camera is mirrored down to the position A, the light beam that has passed through the photographing lens 50 is blocked (reflected) by the main mirror 11 and is not guided to the image sensor 16. Since the image pickup device 16 (shutter 14) is covered with the main mirror 11 by always lowering the main mirror 11 to the position A when shooting is stopped, the image pickup device 16 is removed when the shooting lens 50 is removed from the camera body 10. (Shutter 14) can be protected from adhesion of dust and the like.

(2) When the taking lens 50 is removed from the camera body 10 (Yes in step S421), the system control unit 101 determines that the moving image shooting cannot be continued and stops moving image shooting. Thereby, it is possible to prevent the video recording from being continued despite the lens being removed and the remaining storage capacity of the recording medium 60 from being wasted.

(3) When there is no remaining shooting time (expected moving image shooting time) of the recording medium 60 (Yes in step S417), the system control unit 101 determines that moving image shooting cannot be continued and stops moving image shooting. . Thus, it is possible to prevent the moving image shooting operation (so-called aerial shooting) from being continued even though the shot image cannot be stored.

(4) When the remaining shooting time of the recording medium 60 becomes less than 1 minute, the system control unit 101 causes the external liquid crystal 17 to display a state indicating that movie shooting cannot be continued (flashing remaining shooting time). Since this is done, the photographer can be notified before the mirror is lowered (and the moving image shooting is stopped). In addition, since the remaining shooting time is sequentially updated as the moving image shooting progresses, the photographer can be notified in real time.

(Modification 1)
Although an example in which the finder liquid crystal 19 displays the number of shots and the number of remaining shots in the still image shooting mode and the full display has been described, the external liquid crystal 17 is used instead of the finder liquid crystal 19 or the finder liquid crystal 19 and the external liquid crystal 17 may be configured to be performed by both of them.

(Modification 2)
Although the example in which the display of the remaining shooting time and the full display in the moving image shooting mode is performed on the external liquid crystal 17 has been described, the finder liquid crystal 19 is used instead of the external liquid crystal 17 or both the finder liquid crystal 19 and the external liquid crystal 17 are displayed. You may make it the structure to perform.

(Modification 3)
The display of the remaining shooting time in the moving image shooting mode has been described as an example of blinking when the remaining shooting time is less than 1 minute. However, the remaining shooting time for switching to blinking display may be 2 minutes or 30 seconds, and is set as appropriate. Good.

(Modification 4)
In the movie shooting mode, the remaining shooting time is displayed when the remaining shooting time is longer than the predetermined time (1 minute). However, when the remaining shooting time is longer than the predetermined time, the remaining shooting time is displayed. Instead, the display may be started from the time when the remaining photographing time has divided a predetermined time.

(Modification 5)
Instead of the blinking display, the display color (for example, red) different from the display color (for example, black) of the normal remaining photographing time may be lit. Further, the display color may be changed to a display color different from the display color of the normal remaining photographing time and then blinked. By displaying in a manner different from the normal display of the remaining photographing time, it is possible to warn the photographer that the remaining photographing time is short.

(Modification 6)
A configuration may be adopted in which the number of remaining shots in the still image shooting mode is displayed together with the remaining shooting time during moving image shooting. By displaying the remaining number of still image shots during moving image shooting, it is possible to notify the photographer how many shots can be taken when changing to the still image shooting mode.

(Modification 7)
The detachment determination of the photographic lens 50 (step S421) is performed based on whether or not the communication between the camera body 10 and the photographic lens 50 is established, but a detection switch for detecting the mounting of the photographic lens 50 is provided. You may comprise so that a removal determination may be performed based on the detection signal from a detection switch.

(Modification 8)
In addition to the photographic lens 50 being removed from the camera body 10, the recording medium 60 is removed from the camera body 10, the camera body 10 is wired to an external device (for example, a personal computer, etc.), or the camera body 10 is external device ( For example, even when wirelessly connected to a wireless device or the like, it may be determined that the moving image shooting cannot be continued and the moving image shooting may be stopped. Thereby, it is possible to prevent the moving image shooting from being continued even though the moving image shooting is impossible due to the external operation.

(Modification 9)
In the embodiment described above, an example has been described in which it is determined that it is impossible to continue moving image shooting when there is no remaining shooting time (expected moving image shooting time) of the recording medium 60 (Yes in step S417). Instead of this, it may be determined that the time when the remaining shooting time reaches a predetermined time (for example, 30 seconds) cannot continue moving image shooting. In this case, it is predicted in advance that it is impossible to continue moving image shooting due to an internal factor of the camera, and moving image shooting can be stopped before the remaining shooting time of the recording medium 60 actually becomes zero. Alternatively, the remaining number of still images or the time when the remaining capacity of the recording medium 60 becomes a predetermined value or less may be determined as a state where moving image shooting cannot be continued. As described above, when changing to the still image shooting mode after moving image shooting is stopped, a still image can be captured for several frames, and the captured image can be recorded on the recording medium 60.

(Modification 10)
A configuration may be adopted in which a decrease in battery voltage is detected and the remaining photographing time (remaining battery capacity) is calculated according to the detected voltage. In this case, the system control unit 101 calculates the remaining photographing time according to the decrease in the battery voltage detected by the power supply unit 109. For example, when the battery voltage drops to a voltage corresponding to the remaining shooting time of 5 minutes, the system control unit 101 causes the external liquid crystal 17 or the finder liquid crystal 19 (or both) to blink the battery mark.

  The system control unit 101 of the modified example 10 further retains the remaining battery capacity required for mirroring the main mirror 11 down to the position A when the battery voltage decreases even after the battery mark blinks. Stop shooting. Also in this case, it is possible to predict in advance that it is impossible to continue moving image shooting due to an internal factor of the camera, and the moving image shooting operation can be stopped after the mirror is lowered.

  The above description is merely an example, and the interpretation of the invention is not limited to the correspondence between the components of the above-described embodiment and the components of the present invention.

It is a figure explaining the single-lens reflex electronic camera by one Embodiment of this invention. It is a block diagram explaining the structure of a single-lens reflex electronic camera. It is a flowchart explaining the still image photography processing performed in a system control part. It is a flowchart explaining the moving image shooting process performed in a system control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Camera body 11 ... Main mirror 16 ... Image pick-up element 17 ... External liquid crystal 19 ... Finder liquid crystal 50 ... Shooting lens 101 ... System control part 108 ... Mirror control part 112 ... Image processing part

Claims (6)

An image sensor that captures an optical image from the imaging optical system;
A mirror member that moves between a first position that prohibits the optical image from being guided to the imaging element and a second position that permits the optical image to be guided to the imaging element;
A determination unit that determines a state in which the moving image capturing in which the imaging element repeats the image capturing cannot be continued in a state where the mirror member is positioned at the second position;
And a control unit that moves at least the mirror member to the first position and stops the moving image shooting when the determining unit determines the state incapable of continuing during moving image shooting. Electronic camera. The electronic camera according to claim 1,
The electronic camera according to claim 1, wherein the determination unit performs the determination based on an external operation. The electronic camera according to claim 1,
The electronic camera according to claim 1, wherein the determination unit performs the determination based on a factor inside the camera. The electronic camera according to claim 3.
The electronic apparatus further comprises display means for performing a display indicating that the determination means has determined the inability to continue before the mirror member control means moves the mirror member to the first position. camera. The electronic camera according to claim 4,
When the determination unit performs the determination in accordance with a decrease in the remaining capacity of the recording medium, the display unit displays an expected moving image shooting time corresponding to the remaining capacity. The electronic camera according to claim 4,
When the determination unit performs the determination according to a decrease in the remaining capacity of the battery, the control unit stops the video shooting while leaving a capacity necessary for moving the mirror member to the first position. An electronic camera characterized in that

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