JPH07231401A - Electronic still camera - Google Patents

Abstract

PURPOSE:To reduce the power consumption of an electronic still camera by alternatively supplying control power corresponding to the serial operation in a set mode. CONSTITUTION:In each mode, standby or operating power is supplied to processing parts to be operated for only a necessary period and the power is not supplied to other processing parts. When buttons are depressed in a video output mode, operating power is supplied to image pickup parts (1 to 9) and a frame memory 10. When image pickup data equivalent to one screen is stored, the state is returned to a standby power state. Next, operating power synchronizing with a frequency higher than that at the time of an image pickup is supplied to video output parts (a PM encoder 11 and an output part 12) and a frame memory 10 and a video still image is delivered to a TV monitor. Every time the buttons for the image pickup parts, a frame memory 10 and record parts (a compression processor 13 and a memory card 14) are depressed in a record mode, operating power is supplied. In a reproduction mode, high speed operation power is supplied to a video output part, reproduction parts (the memory card 14, an elongation processor 15) and the frame memory 10, and a reproduced image is delivered to the TV monitor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic still camera, and more particularly to an electronic still camera with reduced power consumption in a control system.

[0002]

2. Description of the Related Art Conventionally, the control power to each functional unit relating to system control in an electronic still camera has been supplied so that the entire system is uniformly driven regardless of the functional sequence between the respective units.

However, in the conventional control power supply system as described above, power corresponding to the drive state is supplied to a processing unit that is not executed in a series of successive processes in the successive process, and recording is performed. Alternatively, when the system such as the reproduction system is set to the specific mode, the processing unit belonging to the mode which is not set is also supplied with the electric power according to the driving state of the processing unit, so that the electric power unnecessary for the sequence control is consumed.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, an electronic device is provided which selectively supplies control power corresponding to successive drive in a mode set only for a processing unit to be controlled to reduce power consumption in the system. The purpose is to provide a still camera.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is a two-dimensional image of an object which is imaged on a field by an image pickup lens, an optical finder and an aperture controlled by the image pickup lens. An image pickup device for photoelectrically converting an optical image into an image signal, an exposure time control means for controlling an exposure time of the two-dimensional optical image photoelectrically converted by the image pickup device in association with a release operation, and an exposure time control means. From the frame, an analog-to-digital conversion means for converting the controlled and photoelectrically converted analog image signal into a digital signal, a frame memory for storing one screen of image data projected and photoelectrically converted by the image sensor, Recording means for compressing the read image data and recording the compressed image data on a recording medium; and the frame memory for expanding the image data read from the recording medium. In an electronic still camera provided with a decompressed image data transmitting means for transmitting, and a conversion output means for converting digital image data in the frame memory into desired data and outputting the converted data, the image data stored in the frame memory is converted into video image data. And a video output mode setting means capable of setting a mode capable of outputting the image data, a recording mode setting means capable of setting a mode capable of recording the image data stored in the frame memory in the recording medium, and a recording mode setting means stored in the recording medium. A reproduction mode setting means capable of setting the reproduced image data into a mode capable of reproducing the video image data; an image pickup section including the diaphragm, an image pickup lens, an image pickup device, an exposure time control means, and a frame memory; A recording unit including a recording unit, the recording medium, the expanded image data transmitting unit, and the frame. Control power is selectively applied to the reproducing section including the memory and conversion output means and the video data output section including the frame memory and conversion output means in correspondence with the successive drive of the release operation process in each mode. The control circuit includes a control power supply unit for supplying the control data, and a synchronization frequency reduction unit for generating a reduced synchronization frequency which is reduced to the synchronization frequency required by the processing unit belonging to the video data output unit. When the output unit is in the non-operating state, the control power supply means sends the control power synchronized with the diminishing sync frequency to the imaging unit, the recording unit and the reproducing unit, and the diminishing sync frequency is the imaging unit. The minimum synchronizing frequency required by the recording unit and the reproducing unit is adopted.

A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. The optical amount of the optical image of the subject is controlled by the diaphragm 1, and the optical image of the subject is formed on the imaging surface by passing through the imaging lens 2. The optical image on the imaging surface is a solid-state charge transfer device, such as a CCD (Charge C
photoelectric conversion by an area image sensor (hereinafter abbreviated as CCD) 3. The sample hold circuit 4 samples and holds the photoelectric conversion output from the CCD 3. Analog-digital converter (hereinafter simply referred to as A / D
A converter 5 converts the analog signal output of each pixel of the sample hold circuit 4 into digital data. A
The E (automatic exposure adjustment) calculation unit 6 receives the output of the analog / digital converter 5 and calculates the exposure. The diaphragm driver 7 drives the diaphragm 1 under the control of the AE calculation unit 6. The imaging lens driver 8 has an optical image of the subject CCD3.
The imaging lens 2 is driven so as to reach the focus on the imaging surface of. The CCD driver 9 performs electronic shutter operation of the CCD 3. The frame memory 10 is connected to the output terminal of the analog / digital converter 5 and is set to 1 on the image pickup surface of the CCD 3.
Frame image data for the screen is stored.

These diaphragm 1, image pickup lens 2, CCD 3,
Sample-and-hold circuit 4, A / D converter 5, AE calculation unit 6, diaphragm driver 7, imaging lens driver 8, CCD
The driver 9 and the frame memory 10 constitute an image pickup section.

The output of the frame memory 10 is connected to the process matrix encoder 11 and
Still video image data is generated from the frame image data stored in
To send still video image data.

These frame memory 10, process matrix encoder 11 and video data transmission terminal 12
Constitutes a video data output unit.

The compression processing unit 13 is connected to the output of the frame memory 10 and compresses the frame image data sent from the frame memory 10 by, for example, discrete cosine transform or the like. The memory card 14 is connected to the output end of the compression processing unit 13 and records the frame image data compressed by the compression processing unit 13. A plurality of frame image data can be recorded in the memory card 14.

The frame memory 10, compression processing section 13 and memory card 14 constitute a recording section.

A decompression processor 15 is connected to the output of the memory card 14 to decompress the compressed image data sent from the memory card 14, and the decompressed image data is connected to the output of the decompression processor 15. Is sent to the frame memory 10.

The memory card 14, expansion processor 15, frame memory 10, process matrix encoder 11 and video data transmission terminal 12 constitute a reproducing unit.

The control power transmission circuit 16 is connected to the central processing unit 17 and the control data bus 18, and each processing unit such as an image pickup unit, a video data output unit, a recording unit and a reproducing unit based on the content of the control command of the central processing unit 17. The standby electric power (standby electric power) or the operating electric power (drive electric power) to be supplied to the control data bus 18 is sent out. Control power transmission circuit 16 and central processing unit
A clock signal generator 19 is connected between the control signal output circuit 16 and the control signal output circuit 16 based on a control command from the central processing unit 17.

The video output mode setting switch 20 is operated from the outside of the camera to set a mode in which the image data stored in the frame memory 10 can be output as video image data. The recording mode setting switch 21 is operated from the outside of the camera to set a mode in which the image data stored in the frame memory 10 can be recorded in the memory card 14. The reproduction mode setting switch 22 is operated from the outside of the camera to set the mode in which the image data recorded in the memory card can be reproduced as video image data. The release switch 23 is linked to the release operation.

2 shows the video output mode setting switch 20, the recording mode setting switch 21 shown in FIG. 1 in which the control power transmission circuit 16 shown in FIG.
Based on each mode information and release operation information input through the switching states of the reproduction mode setting switch 22 and the release switch 23, the diaphragm 1, the imaging lens 2, C
Imaging including a CD 3, a sample hold circuit 4 constituting an exposure time control means, an A / D converter 5, an AE calculation unit 6, an aperture driver 7, an imaging lens driver 8, a CCD driver 9 and a frame memory 10. Part and frame memory
10 and a recording unit including a compression processing unit 13 and a memory card 14 that configure a recording unit, and a frame memory 10, a memory card 14, a decompression processing unit 15, and a conversion output unit that configure a decompressed image data transmission unit. The control power supply state selectively supplied to the reproducing unit including the process matrix encoder 11 and the video data transmitting terminal 12 and the video data outputting unit including the frame memory 10 and the conversion output unit is shown. It is a thing.

The operation of the embodiment having such a structure will be described with reference to FIGS. First, the operation in the recording mode will be described. When the operator sets a recording mode by operating a recording mode button (not shown), for example, the recording mode setting switch 21 shown in FIG. 1 is closed and the central processing unit 17 controls the control power transmission circuit.
Send the recording mode command signal to 16. Based on the content of the command signal, the control power transmission circuit 16 controls the processing unit belonging to the image pickup unit via the control data bus 18, that is, the CCD 3, the sample hold circuit 4, the A / D converter 5, the AE calculation unit 6, the diaphragm drive. Device 7, image pickup lens driver 8, CCD driver 9, frame memory 10, and processing unit belonging to the recording unit, that is, frame memory 10, compression processing unit 13, memory card
The standby powers 30 and 31 shown in FIG. 2 are supplied to 14 respectively, and the respective processing units are brought into the standby state in preparation for operation.

Subsequently, when the operator executes a preliminary operation of a release button (not shown), the release switch 23 shown in FIG. 1 is closed and the central processing unit 17 causes the control power transmission circuit 16 to interlock with the preliminary operation. Sends a release preliminary operation command signal. Based on the content of the command signal, the control power transmission circuit 16 supplies the operating power 32 shown in FIG. 2 to the processing units belonging to the image pickup unit via the control data bus 18 to put the processing units in the operating state. In this state, the image pickup unit starts automatic photometry.

The light quantity of the subject, which is grasped by an operator by an optical finder (not shown) and controlled by the diaphragm 1, is converted into an optical image by the imaging lens 2, and the optical image is C
An image is formed on the image pickup surface of the CD 3. The optical image is photoelectrically converted, and an analog image signal which is the converted output is input to the sample hold circuit 4, which is a clock signal generator.
Synchronized with the clock pulse generated from 19, a sample hold drive pulse transmitted to the control data bus 18 via the control power transmission circuit 16 is received to generate a sampled image on the time axis. Pixel data for each pixel of this sampled image is converted into a digital image signal by an A / D converter 5 driven by a conversion pulse generated in synchronization with a clock pulse.

The data converted into a digital image signal is sent to the AE calculator 6 to perform exposure calculation, and its output is fed back to the diaphragm driver 7 and the imaging lens driver 8 via the control data bus 18. . This operation is executed in the preliminary operation of the release operation, and the CCD driver 9 drives the electronic shutter of the CCD 3 by the main operation of the release operation.
The photoelectric conversion output for one screen corresponding to the optical image on the imaging surface formed with proper exposure is processed by the sample hold circuit 4 and the analog / digital converter 5 and stored in the frame memory 10.

When the control power transmission circuit 16 receives the storage end signal transmitted from the frame memory 10 via the control data bus 18, the control power transmission circuit 16 causes the processing unit other than the frame memory 10 belonging to the image pickup unit, that is, the diaphragm. 1, the imaging lens 2, the CCD 3, the sample and hold circuit 4, the A / D converter 5, the AE calculation unit 6, the diaphragm driver 7, the imaging lens driver 8, and the CCD driver 9 in place of the operating power 32 shown in FIG. The standby power 35 is supplied to put the processing unit in the standby state, and at the same time, the processing unit belonging to the recording unit, that is, the compression processing unit 1
3. The operating power 36 shown in FIG. 2 is supplied to the memory card 14 (FIG. 1) to put the processing unit in the operating state. In this state, the recording unit starts recording. That is, the frame image data of the frame memory 10 shown in FIG. 1 is divided into small blocks, read out, and transferred to the compression processing unit 13. In the compression processing unit 13, for example, data compression by discrete cosine transform is executed. The compressed data is transferred to the memory card 14 and stored therein. In this way, one still image is compressed and recorded in the memory card 14 in the recording mode. When it is desired to record a plurality of still images, the operator repeatedly performs the release operation for the number of sheets while maintaining the recording mode. In this state, the power supply state to each processing unit repeats the pattern in the recording mode shown in FIG.

In the state of the mode, the control power transmission circuit 16 shown in FIG. 1 has the process matrix encoder 11 and the video data transmission terminal 12 belonging to the video data output section as shown in the power states 33 and 34 in FIG. Also, no power is transmitted to the memory card 14 and the expansion processing unit 15 belonging to the reproducing unit. When the operator releases the recording mode, the recording mode setting switch 21 shown in FIG. 1 is opened and the central processing unit 17 sends a recording mode cancellation command signal to the control power sending circuit 16 in conjunction with the releasing operation. Based on the content of the command signal, the control power transmission circuit 16 cuts off the power supply to all the processing units belonging to the imaging unit and the recording unit via the control data bus 18.

Next, the operation in the video output mode will be described. When the operator sets the video output mode by operating a video output mode button (not shown), for example, the video output mode setting switch 20 shown in FIG. A video output mode command signal is sent to the circuit 16. Based on the content of the command signal, the control power transmission circuit 16 supplies the standby powers 37 and 38 shown in FIG. 2 to the image pickup unit and the video data output unit via the control data bus 18, respectively, and operates each processing unit. Be prepared to wait.

Subsequently, when the operator executes a preliminary operation of a release button (not shown), the release switch 23 shown in FIG. 1 is closed and the central processing unit 17 causes the control power transmission circuit 16 to interlock with the preliminary operation. Sends a release preliminary operation command signal. Based on the content of the command signal, the control power transmission circuit 16 supplies the operating power 39 shown in FIG. 2 to the image pickup unit via the control data bus 18 to bring each processing unit of the image pickup unit into the operating state. In this state, the image pickup unit starts automatic photometry. After metering, the CCD3 is released by the main release operation.
The electronic shutter of is activated, image pickup is executed, and image data for one screen is stored in the frame memory 10
When the control power transmission circuit 16 receives the storage end signal transmitted from the control data bus 18 by the control power transmission circuit 16, the control power transmission circuit 16 causes the processing units except the frame memory 10 belonging to the image pickup unit to perform the operations shown in FIG. The standby power 40 is supplied in place of the power 39 to put the processing unit in the standby state, and at the same time, the operating power 41 shown in FIG. 2 is supplied to the video data output unit to put the processing unit in the operating state. In this state, the video data output section starts outputting video data.

The frame image data of the frame memory 10 shown in FIG. 1 is transferred to a process matrix encoder 11 for generating a video signal, and the video signal generated by the encoder is output from a video data transmission terminal 12 to output a still image. As a TV monitor. The still image data provided to the TV monitor is retrieved by refreshing the frame memory 10. In this way, one still image is supplied to the TV monitor in the video output mode.
When a TV monitor of a plurality of still images is desired, the operator repeatedly performs the release operation for the number of images while maintaining the video output mode. The power supply state to each processing unit in this state repeats the pattern in the video output mode shown in FIG.

In the state of the mode, the control power transmission circuit 16 shown in FIG. 1 shows, as shown in power states 42 and 43 in FIG. 2, a processing section except the frame memory 10 belonging to the recording section, that is, a compression processing section 13, The processing unit except the memory card 14 and the frame memory 10 belonging to the reproducing unit, that is, the memory card
14. No power is sent to the expansion processing unit 15. Therefore, power consumption can be reduced.

When the operator releases the video output mode,
In conjunction with this canceling operation, the video output mode setting switch 20 shown in FIG. 1 is opened and the central processing unit 17 sends a video output mode canceling command signal to the control power sending circuit 16. Based on the content of the command signal, the control power transmission circuit 16 cuts off the power supply to all the processing units belonging to the image pickup unit and the video data output unit via the control data bus 18.

Next, the operation in the reproduction mode will be described. For example, when the operator sets a reproduction mode by operating a reproduction mode button (not shown), the reproduction mode setting switch 22 shown in FIG. 1 is closed in conjunction with the operation of this button and the central processing unit 17 controls the control power transmission circuit 16 Send a playback mode command signal to. Based on the content of the command signal, the control power transmission circuit 16 controls the processing unit belonging to the reproducing unit via the control data bus 18, that is, the frame memory 10, the memory card 14,
The decompression processing unit 15 and the processing unit belonging to the video data output unit, ie, the process matrix encoder 11 and the video data transmission terminal 12, are supplied with the standby powers 44 and 45 shown in FIG. 2, respectively, to prepare each processing unit for operation. Put in a waiting state.

Subsequently, when the operator executes a preliminary operation of a release button (not shown), the release switch 22 shown in FIG. 1 is closed in conjunction with the preliminary operation and the central processing unit 17 causes the control power transmission circuit 16 to operate. Sends a release preliminary operation command signal. Based on the content of the command signal, the control power transmission circuit 16 supplies the operation power 46 and 47 shown in FIG. 2 to the reproduction section and the video data output section via the control data bus 18, respectively.
Is supplied to bring the processing unit into an operating state. In this state, the processing section starts the reproducing operation.

After the reproduction operation is started, even if the release switch 23 shown in FIG. 1 is opened in association with the opening of the preliminary operation being performed by the operator through the release button, the start state is maintained for a predetermined time. to continue. Memory card shown in FIG.
The compressed image data stored in 14 is divided into small blocks, read out, and transferred to a decompression processing unit 15. In the decompression processing unit 15, for example, decompression of data by inverse discrete cosine transform is executed, and this decompression is performed. The data is transferred to the frame memory 10 and rewritten by overwriting to write decompressed frame image data for one screen. The expanded frame image data is transferred to the process matrix encoder 11 for generating a video signal, and the video signal generated by the encoder is a video data transmission terminal.
It is output from 12 and used as a still image on a TV monitor.
The still image data provided to the TV monitor is retrieved by refreshing the frame memory 10. When the control power transmission circuit 16 receives an instruction to elapse a predetermined time from the central processing unit 17 and the clock signal generator 19 after the predetermined time desired for viewing has passed, the control power transmission circuit 16 is based on the content of this command.
The reference numeral 16 supplies standby power 48, 49 to the processing units 10, 14, 15 belonging to the reproducing unit and the processing units 11, 12 belonging to the video data output unit, respectively, in place of the operating powers 46, 47 shown in FIG. Put the processing unit in the waiting state. In this way, one still image is reproduced in the reproduction mode. When it is desired to reproduce the compressed data of a plurality of screens stored in the memory card one after another, the operator repeats the preliminary operation of the release operation for the number of sheets while maintaining the reproduction mode. The state of power supply to each processing unit in this state repeats the state pattern in the reproduction mode shown in FIG.

In the state of the mode, the control power transmission circuit 16 shown in FIG. 1 supplies power to each processing unit except the frame memory 10 belonging to the image pickup unit as shown in power states 50 and 51 in FIG. Do not send at all.

When the operator releases the reproduction mode, the reproduction mode setting switch shown in FIG. 1 is interlocked with this release operation.
22 is opened and the central processing unit 17 sends a reproduction mode cancellation command signal to the control power sending circuit 16. Based on the content of the command signal, the control power transmission circuit 16 cuts off the power supply to all the processing units belonging to the reproduction unit and the video data output unit via the control data bus 18.

When it is desired to reproduce compressed data of a plurality of screens stored in the memory card one after another, the system may automatically reproduce one after another without repeating the preliminary release operation. it can. In this case,
The control power transmission circuit 16 shown in FIG. 1 controls the central processing unit 17 and the clock signal after a predetermined time desired by the viewer for one screen reproduced by the operator's release preliminary operation and being provided on the TV monitor. When a desired time elapse command is received from the generator 19, the control power transmission circuit 16 maintains the operating power 46, 47 (see FIG. 2) supplied to the reproducing section and the video data output section based on the content of the command. In this state, one screen for reading the compressed image data is divided into the memory card 14 via the control data bus 18 and the read command is transferred for each small block. The decompression processing unit 15 decompresses the read small block compressed data one after another by inverse discrete cosine transform for each small block, and then the frame memory
The frame image at the time of the previous reproduction is rewritten by overwriting and transferred to 10, and the expanded frame image data for this one screen is written. The decompressed frame image data is converted into a video signal by the process matrix encoder 11 and supplied to the TV monitor from the video data sending terminal 12.

When the desired time desired by the viewer for one screen this time has elapsed and the control power transmission circuit 16 shown in FIG. 1 receives the desired time elapse command, the transmission circuit 16 causes the memory card 14 to display the next 1 The reproduction of compressed data for the screen is instructed via the control data bus 18. In this way, while the playback mode is maintained, playback is continued as long as there is unplayed compressed data in the memory card. To stop continuous playback, cancel the playback mode.

Further, the processing speed can be slowed down to reduce power consumption. A processing unit belonging to the video data output unit is required to have a corresponding processing speed because it generates a TV signal, but a processing unit not belonging to the video data output unit can realize processing at a relatively slow processing speed. . Utilizing this fact, the low frequency control power is relatively sent to the processing unit capable of low speed processing.

When the video output mode is set, the clock signal generator 17 reduces the clock frequency by a frequency divider included in the generator 19 based on a command from the central processing unit 17 and reduces the reduced frequency. It is sent to the control power sending circuit 16. The control power transmission circuit 16 transmits the standby powers 37 and 38 (see FIG. 2) synchronized with the reduced frequency to the image pickup section and the video data output section, respectively. Next, the light metering of the image pickup section is started by the preliminary operation of the release, and when the image pickup is executed, the control power sending circuit 16 sends the operating power 39 (see FIG. 2) synchronized with the declining frequency to the image pickup section. When one frame of the image data is stored in the frame memory 10 and the storage end signal is received by the control power transmission circuit 16, the control power transmission circuit 16 applies a decreasing frequency to each processing unit except the frame memory 10 belonging to the image capturing unit. Synchronized operating power 39 (see Figure 2)
Instead of the standby power 40 synchronized with the diminishing frequency (Fig. 2)
Is supplied to bring the processing unit into the expected state, and at the same time requests the clock signal generator 19 to have a relatively high frequency corresponding to driving the video data output unit. In response to this request, operating power 41 (see FIG. 2) synchronized with the frequency sent from the clock signal generator 19 is supplied to the processing unit by the control power sending circuit, and the processing unit is put into the operating state. In this state, the video data output unit supplies the video still image to the TV monitor.

In the state of the mode, the control power transmission circuit 16 shown in FIG. 1 excludes the processing units except the frame memory 10 belonging to the recording unit, that is, the compression processing unit 13, the memory card 14 and the frame memory 10 belonging to the reproducing unit. In addition to transmitting no power to the processing unit, that is, the memory card 14 and the expansion processing unit 15 (see 42 and 43 in FIG. 2), the control power transmission circuit 16 is a processing unit frame memory belonging to the video data output unit. 10, the process matrix encoder 11, the video data transmission terminal 12, and the processing unit in other cases except the case where the processing unit is in the operating state, that is, the operating state of the video data output unit belonging to the imaging unit The control power synchronized with the diminishing frequency is supplied to each processing unit except the frame memory 10 and each processing unit belonging to the video data output unit in the waiting state. As a result, the power consumption can be further reduced.

When the recording mode is set, the video data output section does not operate as shown in the power state 33 of FIG. 2, so that the control power is sent to all the image processing sections belonging to the imaging section and the recording section in the mode. The circuit 16 outputs control power in synchronization with the diminishing frequency to reduce power consumption.

When set in the playback mode, the control power transmission circuit 16 sends the video data to the playback section in the operating state 46 (FIG. 2) simultaneously with the video data output section in the operating state 47 (FIG. 2). Control power synchronized with a relatively high frequency that drives the output unit is sent out, but when each processing unit is in a waiting state, control power synchronized with the diminishing frequency is sent to the processing unit and consumed. A reduction in power can be realized.

Further, the control power transmission circuit 16 uses the AE calculator 6
Further, by sending the control power synchronized with the most reduced frequency matched with the processing unit capable of processing at the lowest speed to the processing units other than the processing unit belonging to the video data output unit in the operating state, the system as a whole further Low power consumption can be realized.

[0042]

As described above, according to the present invention, in each mode, only the processing section to be operated is supplied with the standby power for the standby state, and the other processing sections are not supplied with power at all, and the operation is performed. Since the processing power is supplied only when the processing unit to be operated is in the operating state, and the processing power that is not in the other operating state is always supplied to the standby power, it is the processing to be operated and the system as a whole does. Low power consumption can be realized.

Further, in the case of the processing unit belonging to the video data output unit and in other cases except the case of being in the operating state, the standby power or the operating power supplied to each processing unit is set to a frequency that is relatively reduced. By making the control power synchronized,
Furthermore, low power consumption can be realized.

[Brief description of drawings]

FIG. 1 is a block functional diagram showing an embodiment of the present invention.

FIG. 2 is a state diagram showing a power supply state in the embodiment shown in FIG.

[Explanation of symbols]

1 diaphragm, 2 imaging lens, 3 CCD, 4 sample and hold circuit, 5 analog / digital converter, 6 A
E calculator, 7 diaphragm driver, 8 imaging lens driver, 9
CCD driver, 10 frame memory, 11 processes
Matrix encoder, 13 compression processing unit, 14 memory card, 15 expansion processing unit, 16 control power transmission circuit, 17
Central processing unit, 18 control data bus, 19 clock signal generator, 20 video output mode switch, 21 recording mode switch, 22 playback mode switch, 23 release switch

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[Procedure amendment]

[Submission date] March 2, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 16, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

Claims (6)

[Claims] 1. An electronic still camera comprising an image pickup section, a recording section, a reproducing section, and a video data output section, and having a video output mode, a recording mode, and a reproduction mode, each of the selected modes. An electronic still camera characterized in that control power is supplied to an imaging unit, a recording unit, a reproducing unit, and a video data output unit corresponding to the operation process of. 2. The electronic still camera according to claim 1, wherein when the video output mode is selected, control power is supplied only to the imaging section and the video output section. 3. The electronic still camera according to claim 1, wherein when the recording mode is selected, control power is supplied only to the image pickup section and the recording section. 4. The electronic still camera according to claim 1, wherein when the reproduction mode is selected, control power is supplied only to the video output section and the reproduction section. 5. A synchronization frequency reduction means for generating a reduced synchronization frequency which is reduced from the synchronization frequency required for the video data output section, the control being performed when the video data output section is in a non-operating state. 3. The power supply means sends control power synchronized with the diminishing sync frequency to the imaging unit, recording unit, and reproduction unit.
The electronic still camera described in 3 or 4. 6. The electronic still camera according to claim 5, wherein the diminishing sync frequency is a lowest speed sync frequency required in the imaging unit, the recording unit, and the reproducing unit.