JP3110568B2 - Electronic still camera and operation method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention captures a subject and converts a video signal representing a still image of the subject into a predetermined recording signal.
An electronic still / recorder that records on a recording medium such as a video floppy (magnetic disk) or a memory card (semiconductor memory)
About the camera.

[0002]

2. Description of the Related Art A conventional camera using a silver halide film for capturing a still image and a VTR for capturing an image electronically and recording the video signal electronically or magnetically.
Since an electronic still camera having the characteristics of a camera is required to be portable, a battery is built in the electronic still camera, and the battery is used as a driving power source to capture an image of a subject and record the image on a recording medium. However, since the electronic still camera is required to be small and lightweight, the battery that can be built in is limited. Therefore, it is an indispensable subject to reduce power consumption in an electronic still camera.

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to reduce the power consumption of an electronic still camera by enabling a power supply circuit of a block not required for processing to be turned off.

An electronic still camera according to the present invention includes a photometric block including a circuit for measuring the luminance of a subject, a power supply for the photometric block included in the photometric block, and applying an operating voltage to the circuit included in the photometric block. An imaging block including a circuit, a circuit for imaging a subject and outputting a video signal representing the subject, an imaging block power supply circuit included in the imaging block, and applying an operating voltage to a circuit included in the imaging block; A recording block including a circuit for recording a video signal representing a subject output from the imaging block and recording the video signal on a recording medium; and an operating voltage included in the recording block and included in the recording block. The power supply circuit for the recording block, the timing pulse for photometry to be supplied to the photometry block, the imaging block A timing pulse for imaging to be supplied to the recording block, a timing pulse generation circuit for generating a timing pulse for recording to be supplied to the recording block, and a timing for photometry from the timing pulse generation circuit to the photometry block Photometric timing for controlling supply of pulses; pulse control switch means; timing for imaging from the pulse generation circuit to the imaging block; imaging timing for controlling supply of pulses to the imaging block; pulse control switch means; Recording timing / pulse control switch means for controlling supply of a recording timing pulse from a pulse generation circuit to the recording block, a two-stage stroke type shutter capable of first-stage depression and second-stage depression・ Release button and above In response to the first-step depression of the release button, the photometric timing / pulse control switch means, the photometric block power supply circuit, the imaging timing / pulse control switch means, and the imaging block power supply circuit are turned on. The recording timing / pulse control switch means is turned on, the recording timing / pulse control switch means and the recording block power supply circuit are turned off, and the imaging timing / pulse control switch means is responsive to the second-step depression of the shutter release button. ,
The power supply circuit for the imaging block, the timing for recording,
The pulse control switch means and the recording block power supply circuit are turned on, and the photometric timing / pulse control switch means and the photometry timing / pulse control switch means are turned off. A timing / pulse control switch means; a recording / timing pulse control switch means; and a control means for controlling the photometric block power supply circuit, the imaging block power supply circuit, and the recording block power supply circuit, respectively. And

According to the present invention, a photometric block including a circuit for measuring the luminance of a subject, an imaging block including a circuit for capturing an image of a subject and outputting a video signal representing the subject, and a subject output from the above-described imaging block are represented. A photometric timing pulse control switch for controlling supply of photometric timing pulses to said photometric block in an electronic still camera having a recording block including a circuit for recording and recording a video signal on a recording medium; An imaging timing / pulse control switch for controlling supply of an imaging timing pulse to the imaging block; a recording timing / pulse control switch for controlling supply of a recording timing / pulse to the recording block; Circuit included in the photometry block and included in the photometry block A power supply circuit for a photometric block that provides an operating voltage, a power supply circuit for the imaging block that is included in the imaging block, and that provides an operating voltage to a circuit included in the imaging block, that is included in the recording block, and A power supply circuit for a recording block for applying an operating voltage to a circuit included in the recording block, and a two-stage stroke capable of depressing in a first stage and a second stage.
Type shutter release button
In response to the first-step depression of the shutter release button, the timing pulse control switch for photometry, the power supply circuit for the photometry block, the timing pulse control switch for imaging, and the power supply circuit for the imaging block Are turned on, the recording timing / pulse control switch means and the recording block power supply circuit are turned off, and in response to the second-step depression of the shutter release button, the imaging timing / pulse control switch is turned off.
The pulse control switch means, the power supply circuit for the imaging block, the recording timing / pulse control switch means and the power supply circuit for the recording block are turned on, respectively, and the timing / pulse control switch means for photometry and the power supply circuit for the photometry block are turned on. It is characterized in that it is turned off.

In an imaging block, a recording block, and a photometry block, a timing pulse is applied to each block in order to perform the operation of each block. In a block to which a timing pulse is applied, a prescribed operation is performed in response to each timing pulse.

[0007] In an electronic still camera, in order to save power when divided into functions such as imaging, recording, and photometry,
It is preferable to turn off a power supply circuit of a block that is not necessary for each processing during each of the imaging processing, the recording processing, and the photometry processing. However, when a power supply circuit of a block is turned off, a timing pulse may be input to a block whose power supply circuit is turned off. When a timing pulse is input to a block in which the power supply circuit is turned off, an excessive current flows in the block and the circuit of the block may be destroyed.

According to the present invention, a photometric timing pulse control switch means for controlling supply of a photometric timing pulse to the photometric block, and an imaging timing for controlling supply of an imaging timing pulse to the imaging block A pulse control switch means and a recording timing / pulse control switch means for controlling supply of a recording timing pulse to the recording block. According to the settings of various modes, the timing pulse is supplied only to the blocks necessary for the function of the set mode, and the timing pulse is supplied to the blocks unnecessary for the function of the set mode. Each timing / pulse control switch is turned on and off.

Therefore, when a power supply circuit of a block unnecessary for the function of the set mode is turned off, a timing pulse is not supplied to the block of the power supply circuit that has been turned off. Therefore, it is possible to prevent an excessive current from flowing into the block in which the power supply circuit is turned off due to the input of the timing pulse.

Further, according to the present invention, the photometric timing pulse control switch means, the photometric block power supply circuit, and the imaging timing pulse control switch are responsive to the first-step depression of the shutter release button. The means and the power supply circuit for the imaging block are respectively turned on, and the timing / pulse control switch means for recording and the power supply circuit for the recording block are turned off. Then, in response to the second stage depression of the shutter release button, the imaging timing / pulse control switch means, the imaging block power supply circuit, the recording timing / pulse control switch means, and the recording block / pulse control switch means. The power supply circuits are turned on, and the photometric timing pulse control switch means and the photometric block power supply circuit are turned off.

In response to depression of the shutter release button, ON / OFF control of each timing pulse control switch means and ON / OFF control of each power supply circuit can be performed. The user can perform on / off control along with a series of operations necessary for shutter release without any particular awareness. Further, the photometric timing / pulse control switch means and the photometric block power supply circuit, the imaging timing / pulse control switch means and the imaging block power supply circuit, and the recording timing / pulse control switch means and the recording block power supply circuit correspond to each other. ON / OFF control is possible. When the power supply circuit is turned off, the timing / pulse control switch means corresponding to the power supply circuit is also turned off, and when the power supply circuit is turned on, the timing / pulse control switch means corresponding to the power supply circuit is also turned on. When the power supply circuit is off, the corresponding timing pulse control switch means is turned on, so that it is possible to prevent a timing pulse from being input to a circuit in the corresponding block by mistake. In addition, it is possible to prevent the corresponding timing pulse control switch means from being turned off when the power supply circuit is turned on, thereby preventing a necessary timing pulse from being supplied to a circuit in the corresponding block.

The electronic still camera can also have a reproducing function, and a circuit included in a reproducing block for performing a reproducing process may be common to a circuit included in a recording block. It can be positioned as a recording / playback block.

In an electronic still camera having a recording / reproducing block, a timing pulse control switch is controlled so that a timing pulse is applied to the recording / reproducing block when a reproducing mode is set. The power supply circuits of the imaging block and the photometry block are turned off.

In the above, for example, the imaging timing pulse includes a charge transfer pulse of the solid-state electronic imaging device, the recording timing pulse includes a horizontal synchronization pulse, and the photometry timing pulse includes a horizontal synchronization pulse. Pulse included.

Further, in the above description, turning off the power supply circuit includes stopping the supply of the voltage from the power supply and stopping the output of the power supply circuit. It also includes turning off a switching regulator included in the power supply circuit.

[0016]

FIG. 1 is a block diagram showing an electrical configuration of a digital still camera according to an embodiment of the present invention.

The whole digital still camera is controlled by a controller 2.

The digital still camera has an image pickup block 20 for picking up an image of a subject and outputting a video signal representing a still image of the subject, converting the video signal into a predetermined recording signal and recording it on a recording medium; It includes a recording / reproducing block 30 for reproducing and a photometric block 40 for measuring the luminance of the subject.

The image pickup block 20 includes an image pickup system power supply circuit 5 for supplying an operation voltage to each circuit included in the image pickup block 20, and the recording / reproduction block 30 applies the operation voltage to each circuit included in the recording / reproduction block 30. Recording / playback power supply circuit
35, and the photometric block 40 includes a photometric power supply circuit 45 for supplying an operating voltage to each circuit included in the photometric block 40.

A voltage is supplied to each of these power supply circuits 5, 35 and 45 from a main power supply (not shown). Power supply circuit 3,35
When the switches 45 and 45 are turned off, the supply of the voltage from the main power supply to each of the power supply circuits 5, 35 or 45 is stopped by a switch circuit or the like. Of course, the output of the voltage from each power supply circuit 5, 35 or 45 may be stopped, or each power supply circuit 5, 35 or
The transistor of the switching regulator included in 45 may be turned off.

Further, a voltage is also supplied to the CG 1, the controller 2 and the distance measuring sensor 51 by the main power supply. CG
A voltage is always supplied to the controller 1, the distance measuring sensor 51, and the distance measuring sensor 51 when a power switch (not shown) of the digital still camera is turned on. Further, the controller 2 is always supplied with a voltage from an auxiliary power supply (not shown) and is backed up.

The circuit included in each block operates in response to a given timing pulse. Digital still circuits are used to generate timing pulses.
A clock signal generation circuit (hereinafter referred to as CG) 1 for the camera
It is included.

CG1 is a vertical transfer pulse φV for driving the vertical transfer path of the CCD 4, a horizontal transfer pulse φH for driving the horizontal transfer path of the CCD 4, and double sampling pulses DS and R for correlated double sampling.
(Red), G (Green), B (Blue) color separation sampling pulse SP for color separation of the signal, Sample hold pulse SH for resampling the color separated RGB signal, Analog of video signal / Outputs AD clock pulse ADCLK for digital conversion. These pulses are used as imaging timing pulses in the imaging block.
20, the imaging block through the switch circuit group 3
Given to each of the 20 circuits.

The CG 1 outputs an index R signal IXR for identifying the R signal, a 27 MHz clock signal, a horizontal synchronizing signal HD, and a field index signal FI for discriminating between the A and B fields. These signals and the AD clock signal are supplied to the recording / reproducing block 30 as recording / reproducing timing pulses, and supplied to the respective circuits of the recording / reproducing block 30 via the switch circuit group 33.

Further, CG1 outputs an X timing pulse XTM as a flash emission timing signal. X
The timing pulse XTM is supplied to the photometry block 40 as a photometry timing pulse together with the horizontal synchronization signal HD and the field index signal FI, and is supplied to each circuit of the photometry block 40 via the switch circuit group 43.

The switches included in switch circuit groups 3, 33 and 43 can be realized by, for example, semiconductor switching elements.

The digital still camera includes a distance measuring sensor 51 for measuring the distance to the subject, and distance information is given to the controller 2. An imaging lens (not shown) is positioned at a focus position based on the distance information.

The digital still camera is capable of both recording image data on the memory card 32 and reproducing image data recorded on the memory card 32.
Recording / playback switch 52 for setting recording or playback
It is included. Further, the digital still camera includes a shutter release button 53. The shutter release button 53 is of a two-stage stroke type. When the shutter is depressed in the first step, photometry, exposure control based on the photometry and focusing control based on the distance measurement are performed. The image data is recorded on the memory card 32 by the lowering.

The vertical transfer pulse φV and the horizontal transfer pulse φH are applied to the CCD 4.

In the CCD 4, interlaced photographing is performed by a substrate removal pulse, an A-field vertical transfer pulse, a B-field vertical transfer pulse, and a horizontal transfer pulse H, and the A-field and B-field video signals (GR
GB color sequential signals) are alternately generated for each field period and sequentially read. The driving of the CCD 4 (imaging and reading out of a video signal) is performed at least at the time of photographing and in the photometric processing preceding it.

The double sampling pulse DS is applied to a correlated double sampling circuit (CDS) 7.

The A-field and B-field video signals output from the CCD 4 are supplied to a correlated double sampling circuit 7, which performs a correlated double sampling process on the basis of the RGB color sequential signals input in response to the double sampling pulse DS. Is applied to the color separation circuit 8.

The color separation circuit 8 has a sampling pulse S
P is given.

The color separation circuit 8 separates the video signal into three primary color, G, R and B color signals representing the subject image based on the sampling pulse SP.

The color signals G, R, and B are adjusted in color balance by a gain control circuit (hereinafter, referred to as GCA) 9, and then subjected to gradation correction by a gamma correction circuit 10 to be resampled. Enter 11

The resampling circuit 11 is supplied with a sample / hold pulse SH.

The resampling circuit 11 performs three color signals R, G, B on the basis of the sample / hold pulse SH.
Are converted into color sequential signals of GRGB. This color sequential signal is supplied to the A / D converter 13.

The A / D converter 13 is supplied with an AD clock pulse ADCLK.

The A / D converter 13 converts a color sequential signal into digital image data in synchronization with the AD clock pulse ADCLK.

When the recording mode is set by the recording / reproducing switch 52, as described in detail later, before photographing, the shutter release button 53 is depressed in the first stage to enter the photometric mode, and photometric processing and photometric values are performed. (Control of the aperture and the shutter speed) based on. This photometric processing is performed based on the output signal of GCA9. After such photometric processing and exposure control, distance measurement processing is performed by the distance measuring sensor 51, and focusing control of the imaging lens is performed. When the shutter release button is depressed in the second stage, the imaging mode is set, and the image signals obtained from the CCD 4 by the imaging are transmitted to the circuits 10, 11, and 10 described above.
The digital image data is passed through 12 and 13 and is supplied to the recording / reproducing processing circuit 31 of the recording / reproducing block 30.

The recording / reproducing processing circuit 31 is supplied with an index R signal IXR, an AD clock signal, a 27 MHz clock signal, a horizontal synchronizing signal HD and a field index signal FI.

The color-sequential digital image data of RGB,...
Luminance (Y) and color (C) data are generated from color-sequential digital image data based on the XR and the clock signal. The generated digital luminance data and digital color data are subjected to
(Discrete Cosine Transformation) The image data is compressed by performing conversion, Huffman coding, run-length coding and the like. The compressed digital image data is converted to a horizontal synchronizing signal HD and a field index signal FI.
Thus, the image data is provided to the memory card 32 for each field image and recorded.

The digital still camera has a recording /
When the reproduction mode is set by using the reproduction switch 52, the reproduction mode is set. The digital image data recorded on the memory card 32 is read, reproduced, and output as an analog reproduction signal.

The compressed digital image data recorded on the memory card 32 is supplied to a recording / reproducing processing circuit 31. In the recording / reproducing processing circuit 31, decoding of digital image data, inverse DCT conversion, etc. are performed, and D / A
The conversion is performed and output as a reproduction signal. When the reproduction signal is given to a television device or the like, it is visually displayed.

First, the photometric processing will be described. In the photometry processing, each circuit included in the imaging block 20 and the photometry block 40
Are used, and the switch circuit groups 3 and
43, the imaging system power supply circuit 5 and the photometry system power supply circuit 45 are all turned on by the controller 2. In the photometric processing, the circuits included in the recording / reproducing block 30 do not need to operate, so the switch circuit group 33 and the recording / reproducing power supply circuit 35 are turned off by the controller 2.

[0046] For light measurement process, Y _L synthesizing circuit 14, the gate circuit 15, integrating circuit 16 and the amplifier circuit 17 is provided. The controller 2 outputs a window signal WIND for controlling the gate circuit 15 and a reset signal HLRST for resetting the integration circuit 16. The timing of these signals WIND and HLRST will be described later. In this embodiment, the CPU 41 has an A / D converter 48 built therein.

The CPU 41 is supplied with a horizontal synchronizing signal HD, a field index signal FI and an X timing signal XTM via a switch circuit group 43. C
In the PU 41, the horizontal synchronizing signal HD and the field
Based on the index signal FI, predetermined data for each horizontal line is added in accordance with each field, and photometric calculation processing is performed.

The color signals R, G and B output from the gain control circuit 9 are added by the _YL synthesis circuit 14 and
A relatively low-frequency luminance signal Y _L (hereinafter simply referred to as a luminance signal Y _L
Is generated. The luminance signal Y _L is passed through the period gate circuit 15 the window signal WIND is given in the required horizontal scanning period. The integrating circuit 16 is reset when a reset signal HLRST is given,
Then integrating the luminance signal Y _L input from the gate circuit 15. After the integration signal of the integration circuit 16 is amplified by the amplification circuit 17, the A / A of the CPU 41 is immediately before the integration circuit 16 is reset.
It is converted to digital integrated data by the D converter 48,
It is taken into the CPU 41.

In this embodiment, average photometry (hereinafter, referred to as AV photometry) for measuring the average brightness in the visual field, and spot photometry (hereinafter, referred to as SP photometry) for measuring the brightness of the main subject in the visual field. ) And is possible. SP
The photometry is particularly useful when the brightness of the main subject in the field of view and the background are different and it is necessary to set appropriate exposure conditions accordingly. Since it is considered that the A-field image and the B-field image that constitute one frame represent almost the same point-of-view image, the A-field video signal is used for AV photometry, and the B-field video signal is used for SP photometry. Respectively.

In this embodiment, the integration by the integration circuit 16 and the A / D conversion operation and the addition processing by the A / D converter 18 are alternately performed for each horizontal scanning period.

FIG. 2 shows an AV metering area and an SP metering area set in the photographing area 50 of the CCD.

The AV metering area is basically set over almost the entire photographing area 50. In this embodiment, the AV photometry area is set in the horizontal direction to a period of 40 μs (first photometry period) after a lapse of 16 μs from the fall of the horizontal synchronization signal HD (at the start of the horizontal scanning period), and in the vertical direction. Is set between the 35th horizontal scanning line and the 246th horizontal scanning line (second photometric period).

The SP metering area is set as a small area at an arbitrary position in the photographing area 50. In this embodiment, the SP photometry area is set at the center of the photographing area 50, and the horizontal direction is set to 15 μs after a lapse of 28.5 μs from the fall of the horizontal synchronization signal HD (first photometry period), and the vertical direction is set to the vertical direction. The period is set between the 87th horizontal scanning line and the 194th horizontal scanning line (second photometric period).

As shown in FIG. 3, in the AV photometry in the A-field period, a window signal WIND having a pulse width of 40 μs is applied to the gate circuit 15 16 μs after the falling edge of the 35th horizontal synchronization signal HD. While the window signal WIND is supplied, the gate circuit 15
It passes the luminance signal Y _L for inputting the luminance signal Y _L
Is input to the integration circuit 16.

The integrating circuit 16 has already been reset at field preceding integrates the luminance signal Y _L for inputting through the gate circuit 15. Window signal WIND
There the input to the integrator circuit 16 of the luminance signal Y _L becomes L level is stopped, the integration circuit 16 of the integrated output is A / D converted incorporated integral output of the integrating circuit 16 to the CPU41 is held as it is The data is converted into digital data by the unit 48. The time required for A / D conversion is
15 μs. After that, the integration circuit 16
And is ready for the next integration operation by the horizontal line reset signal HLRST given by

A memory attached to the CPU 41 (for example, RA
M) The AV integrated data storage area is cleared in synchronization with the 34th horizontal synchronization signal HD. The integrated value converted to digital data by A / D converter 48 is
The data is added to the previous data (in the first case, it is zero because it is cleared) and stored in the V integral data storage area.

The A / D conversion by the A / D converter 48, the resetting of the integration circuit 16 and the addition processing of the integration data are performed in the following steps.
This is performed in the 36th horizontal scanning period.

As described above, the integration of the luminance signal Y _L by the integration circuit 16 into one horizontal scanning line in the AV photometry area and the A of the integrated signal obtained by this integration are performed.
The / D conversion, the reset of the integration circuit 16 and the addition of the integration data to the memory are alternately repeated every horizontal scanning period. This repetition is performed until the 246th horizontal scanning period, that is, over the entire area within the AV photometry area.

When SP photometry is performed, a pulse width of 15
window signal WIND of μs is supplied to the gate circuit 15 after 28.5μs the falling of the 87-th horizontal synchronizing signal HD, during this period, the integration circuit 16 integrates the luminance signal Y _L for inputting. The window signal WIND is performed every other horizontal scanning period until the 193rd horizontal scanning period. The A / D conversion of the integration signal output from the integration circuit 16 to the integration data, the resetting of the integration circuit 16 and the addition of the integration data in the memory are performed in the same manner as in the case of the AV photometry described above, ie, the next horizontal scanning. It takes place in a period.

FIG. 4 shows the overall operation of a recording or reproducing process in a digital still camera.

When a power switch (not shown) of the digital still camera is turned on, power is supplied to the CG 1 and the controller 2 to determine whether recording or reproduction is set (step 61).

When recording is set by the recording / reproducing switch 52, it is determined whether or not the shutter release button 53 has been pressed in the first stage (step 62). When the shutter release button 53 is depressed at the first stage (YES in step 62), the photometric mode is set.

The imaging block 20 and the photometry block 40 are required for photometry processing, and the recording / reproducing block 30 is not required for photometry processing. In the photometry mode, the switch circuit groups 3 and 43, the imaging power supply circuit 5, and the photometry power supply circuit 45
Are turned on, and the switch circuit group 33 and the recording / reproducing power supply circuit 35 are turned off (step 6).
3).

[0064] from the RGB signals outputted from the GCA9 as described above followed, subject brightness given to CPU41 through the circuit 15, 16 and 17 are extracted luminance signal by Y _L synthesizing circuit 14 is measured (Step 64 ). The aperture value and the shutter speed of the aperture (not shown) are controlled so as to obtain an appropriate exposure amount based on the measured subject luminance.

When the exposure control processing is completed (at step 65,
YES), shift to the distance measurement process.

The distance information to the subject output from the distance measuring sensor 51 is given to the controller 2. Based on the distance information to the subject, the controller 2 positions the imaging lens (not shown) at the in-focus position (step S1).
66). When the focusing control is completed (YES in step 68), the operation of the camera is in a standby state until the shutter release button 53 is pressed down in the second stage.

When the photographer presses the shutter release button 53 in the second stage (step 68).
YES), shift to recording mode. The recording of the image data on the memory card 32 requires the imaging block 20 and the recording / reproducing block 30, and the photometry block 40 is not required.
Therefore, when the mode shifts to the recording mode, the switch circuit groups 3 and 33, the imaging power supply circuit 5 and the recording / reproduction power supply circuit 35 are turned on, respectively, and the switch circuit group 43 and the photometry power supply circuit 45 are turned off (step 69).

Subsequently, a recording process is performed (step 7).
0), the image data representing the subject image passes through a CCD 4, circuits 7, 8, 9, 10, 11 and 13 and a recording / reproducing processing circuit 31
Then, a predetermined process such as data compression is performed in a recording / reproducing processing circuit 31 to be recorded on the memory card 32.

At the time of reproduction, the recording / reproduction block 30 is required, and the imaging block 20 and the photometry block 40 are not required. Therefore, when the reproduction is set by the recording / reproduction switch 52 (step 61), the reproduction mode is set, and the switch circuit group 33 and the recording / reproduction power supply circuit 35 are turned on.
The switch circuit groups 3 and 43, the imaging system power supply circuit 5, and the photometry system power supply circuit 45 are turned off (step 71).

Subsequently, the image data of the frame designated by the camera user is read from the memory card 32, and
The decoding, inverse DCT transform,
D / A conversion and the like are performed and output as a reproduction signal (step 72). The reproduction signal is visually displayed by being supplied to the television device.

[Brief description of the drawings]

FIG. 1 shows a digital still image according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an electrical configuration of the video camera.

FIG. 2 shows a photometry area set in an imaging area.

FIG. 3 is a time chart when performing average photometry.

FIG. 4 is a flowchart showing a processing procedure when performing recording and reproduction processing.

[Explanation of symbols]

 Reference Signs List 1 CG 2 controller 3, 33, 43, switch circuit group 5 imaging system power supply circuit 20 imaging block 30 recording / reproduction block 35 recording / reproduction system power supply circuit 40 photometry block

Continuation of front page (56) References JP-A-64-25682 (JP, A) JP-A-63-260279 (JP, A) JP-A-64-37177 (JP, A) JP-A-62-183280 (JP, A) JP-A-1-307372 (JP, A) JP-A-2-248170 (JP, A) JP-A-3-195331 (JP, A) JP-A-4-16086 (JP, A) 63-1331464 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/225 H04N 5/235

Claims (12)

(57) [Claims] 1. A photometric block including a circuit for measuring the luminance of an object , a photometric block included in the photometric block, and
For photometric block that gives operating voltage to circuits included in the block
Power supply circuit, times for outputting an image signal representing a subject by imaging a subject
An imaging block including a road, included in the imaging block , and
For imaging blocks that apply operating voltage to circuits included in the block
Power supply circuit, a recording block comprising a circuit for recording the recording process to the recording medium a video signal representing a subject outputted from the imaging block, included in the recording block, and the recording Bro
For the recording block that gives the operating voltage to the circuit included in the block
A power supply circuit, a timing pulse for photometry to be supplied to the photometry block, a timing pulse for imaging to be supplied to the imaging block, and a timing for generating a timing pulse for recording to be supplied to the recording block. A pulse generating circuit, a photometric timing / pulse control switch means for controlling supply of a photometric timing pulse from the timing / pulse generating circuit to the photometric block, and an imaging timing from the timing / pulse generating circuit to the imaging block Imaging timing for controlling the supply of pulses; pulse control switch means; timing for recording from the timing pulse generation circuit to the recording block recording timing for controlling supply of pulses; pulse control switch means , first stage Down and second stage down Door that can be two
Step-stroke type shutter release button,
And the first step of the shutter release button
In response to the depression, the photometric timing and pulse control switch means , the photometric block power supply circuit, the imaging timing and pulse control switch means, and the
The image block power supply circuits are turned on, and the recording timing / pulse control switch means and the recording block are turned on.
Turn off the power supply circuit for the shutter and release the shutter release button.
In response to the depression of the second stage of Tan, the imaging timing pulse control switch means, for the IMAGING block
The power supply circuit, the recording timing / pulse control switch means, and the recording block power supply circuit are each turned on, and the photometric timing / pulse control switch means and the power supply circuit are turned on .
And the photometric timing pulse control switch means so as to turn off the power supply circuit for the photometric block, the imaging timing pulse control switch means, the recording timing pulse control switch means and said metering Bed
A power supply circuit for locking, a power supply circuit for the imaging block, and
The recording block respectively controlled to that control unit power supply circuit for an electronic still camera equipped with. 2. The recording block according to claim 1, wherein the recording block is a recording / reproducing block capable of reproducing a recording signal recorded on the recording medium to obtain a reproduction signal. A recording / reproduction timing pulse to be generated, wherein the recording / timing pulse control switch means controls the supply of the recording / reproduction timing pulse from the timing pulse generation circuit to the recording / reproduction block. to is intended, the upper Symbol control means turns on the timing pulse control switch means for the recording and reproduction when the reproducing mode for obtaining a reproduction signal is set, the photometric timing pulse control switch means and the 2. The imaging timing / pulse control switch means is turned off, respectively. Mounting electronic still camera. 3. The electronic still camera according to claim 1, wherein the imaging timing pulse includes a charge transfer pulse of a solid-state electronic imaging device. 4. The electronic still camera according to claim 1, wherein the recording timing pulse includes a reference clock pulse and a horizontal synchronization pulse. 5. The electronic still camera according to claim 1, wherein the photometric timing pulse includes a horizontal synchronizing pulse. 6. The above type recording reproducing block power supply circuit for supplying an operating voltage to the recording and reproducing block, and the turns on the power supply circuit for the recording and reproducing block when the reproduction mode is set, and the photometric block power circuit and 3. The electronic still camera according to claim 2, further comprising a power supply circuit control unit that controls the power supply circuit for the imaging block to be turned off. 7. A photometric block including a circuit for measuring the luminance of a subject, an imaging block including a circuit for capturing a subject and outputting a video signal representing the subject, and a video signal representing the subject output from the imaging block. An electronic still camera including a recording block including a circuit for performing recording processing and recording on a recording medium, comprising: a photometric timing / pulse control switch means for controlling supply of a photometric timing pulse to the photometric block; Imaging timing / pulse control switch means for controlling the supply of the imaging timing pulse to the block; recording timing / pulse control switch means for controlling the supply of the recording timing pulse to the recording block; And above
A photometry block that applies operating voltage to the circuits included in the photometry block
Locking power supply circuit, included in the above imaging block
Operating voltage to the circuits included in the imaging block.
The power supply circuit for the imaging block, which is provided in the recording block
Circuit included in the above recording block
A power supply circuit for a recording block for applying an operating voltage;
A two-stage switch that can push down the stage and push down the second stage
Providing a trolley type shutter release button, and depressing the shutter release button in the first step
Responding to the above, the photometric timing / pulse control switch means , the photometric block power supply circuit, the imaging timing / pulse control switch means, and the imaging block.
The recording power supply circuit is turned on, and the recording timing / pulse control switch means and the recording block power supply are turned on.
The power supply circuit is turned off, and the shutter release button
In response to the two-step depression ,
Pulse control switch means , power supply for the imaging block
Road, your above-mentioned recording timing pulse control switch means
And the power supply circuit for the recording block is turned on, and the timing / pulse control switch means for photometry and the
An operation control method for an electronic still camera that turns off the power circuit for the photometry block . 8. The recording / reproducing block, wherein the recording block is a recording / reproducing block capable of reproducing a recording signal recorded on the recording medium to obtain a reproduction signal. It controls the supply of recording / reproducing timing pulses to the block. When a reproducing mode for obtaining a reproducing signal is set, the recording / reproducing timing / pulse control switch means is turned on, and the photometric timing / pulse is turned on. The method of operating an electronic still camera according to claim 7 , wherein the pulse control switch means and the imaging timing / pulse control switch means are respectively turned off. 9. The electronic still camera according to claim 7 , wherein the imaging timing pulse includes a charge transfer pulse of a solid-state electronic imaging device. 10. The electronic still camera according to claim 7 , wherein the recording timing pulse includes a reference clock pulse and a horizontal synchronization pulse. 11. The electronic still camera according to claim 7 , wherein the timing pulse for photometry includes a horizontal synchronization pulse. 12. The upper Symbol further electronic still camera equipped with a power circuit for recording and reproducing block providing an operating voltage to the recording and reproducing block, and turn on the power circuit for the recording and reproducing block when the reproduction mode is set, 9. The operation method of the electronic still camera according to claim 8 , wherein the power supply circuit for the photometry block and the power supply circuit for the imaging block are turned off.