JPH0738699B2 - Electronic still camera - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an electronic still camera, more specifically, a subject is photographed by an image pickup device such as a solid-state image pickup device, and a video signal thereof is recorded on a rotary recording medium such as a magnetic disk. The present invention relates to an electronic still camera for recording.

[Background of the Invention]

Recently, an image pickup device such as a solid-state image pickup device or a pickup tube is combined with a recording device using a rotary magnetic recording medium such as a magnetic disk which is inexpensive and has a relatively large storage capacity as a recording medium.
An electronic still camera system has been developed in which a subject is photographed electronically as a still image, recorded on a rotating magnetic recording medium, and an image is reproduced by a separate television system or printer.

In such an electronic still camera, an optical finder is used as the finder. When shooting while checking the subject with an optical viewfinder in an electronic still camera, recording on a recording medium such as a magnetic disk due to the characteristics of the solid-state image sensor such as CCD or the number of pixels of the image sensor is limited. The image information of the subject that is formed does not actually match the subject information that is visually recognized through the optical viewfinder. Therefore, it is normal for the photographer to have some discomfort when viewing the reproduced image.

On the other hand, there is an electronic viewfinder for the optical viewfinder, which electrically processes a subject image and displays it on a display screen using image information of the subject recorded on a recording medium.

Therefore, the subject image confirmed by the electronic viewfinder is the same as the image reproduced from the image information actually recorded on the recording medium, and the recorded subject image can be confirmed as it is by the finder. In the current electronic still cameras, an electronic viewfinder can be attached as an adapter.

On the other hand, a system has been proposed in which an electronic still camera can be used as a movie camera by mounting an adapter on the electronic still camera. By attaching a movie adapter as an interface to the camera body, it is possible to switch the shooting mode from the normal mode for still shooting using the optical viewfinder provided on the camera body to the movie camera mode for shooting as a movie camera. It was made possible.

As described above, there are conventional electronic still cameras capable of shooting in the normal mode and the movie camera mode, but the normal mode and the movie adapter are mounted for still shooting, and the video signal is output to the outside. There was no one that could switch between movie still mode and shoot.

[Object of the Invention]

The present invention has been made in view of such circumstances,
As for the shooting mode, while shooting still images of the subject using the normal mode and electronic viewfinder that use the optical viewfinder provided on the camera body,
An object of the present invention is to provide an electronic still camera that can be used by switching to a movie still mode for outputting a video signal to the outside via an interface.

[Outline of Invention]

The present invention, in order to achieve the above object, a mode switching means for switching between a normal mode and a movie still mode,
Exposure means for exposing a subject image to the image pickup means, image pickup means for photoelectrically converting the subject image exposed by the exposing means, and reading an image pickup signal corresponding to the subject image, and one track of a rotating rotary recording medium. Recording means for recording a video signal for one frame read from the image pickup means, driving means for rotating a rotary recording medium, frequency signal generating means for generating a frequency signal indicating the rotation speed of the rotary recording medium, and the rotation. Phase pulse generating means for generating one phase pulse each time the rotating recording medium makes one revolution by detecting a phase generating member provided on the recording medium, and the frequency signal are preset in the normal mode. The drive means is controlled to match the steady frequency so that the frequency signal matches the steady frequency in the movie still mode and Servo means for controlling the driving means so that the phase pulse coincides with the vertical synchronizing signal output from the synchronizing signal generating means, and a lock detection signal is outputted when the frequency signal coincides with a steady frequency in the normal mode, Lock detection means for outputting a lock detection signal when the frequency signal matches the stationary frequency and the phase pulse matches the vertical synchronization signal in the movie still mode, and a synchronization signal including the vertical synchronization signal to the imaging means and the recording means. Sync signal generating means for outputting, when the lock detection signal is input in the normal mode and then the first phase pulse is input, the sync signal generating means resets and starts the sync signal at the time of input of the phase pulse; A control means for controlling the drive means, the exposure means, the image pickup means, and the recording means. Wherein,
When the activation instruction is input in the normal mode, the drive means is activated, and when the exposure instruction is input, the exposure means is operated and at least the image pickup means and the recording means are operated after the lock detection signal is input from the lock detection means. In the movie still mode, the exposure means and the image pickup means are operated to output a video signal to the outside through the interface, and when the activation instruction is input, the driving means is activated, and when the exposure instruction is input, at least the The recording means is operated after the lock detection signal is input from the lock detection means.

〔Example〕

Hereinafter, preferred embodiments of an electronic still camera according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, an electronic still camera according to the present invention implements a photographing lens system 10 for forming a subject image and an aperture 12.
And an imaging optical system 24 including the optical shutter 14. The taking lens system 10 of the image pickup optical system 24 is connected via the AF motor 11,
Further, the diaphragm 12 is connected to the control circuit 20 via a diaphragm motor 13. The photometric element 16 is arranged in the optical path of the image pickup optical system 24, and the detection output from the photometric element 16 is taken into the control circuit 20 as the luminance information of the subject. The mirror 15 is a mirror for guiding the reflected light from the subject to an optical finder (not shown), and is normally at the position shown by the solid line, but at the time of exposure, it is jumped up to the position shown by the dotted line.
More controlled. Regarding the exposure control, the control circuit 20 responds to the photometric element 16, the switch SW2 that operates in response to the shutter release button 22, and the synchronization signal generation circuit 18, and operates the shutter 1
4 and diaphragm 12 are controlled.

In the present embodiment, the shutter release button 22 operates in a two-step stroke, and the switch SW1 is closed in the first stroke of the shutter release button 22 so that the circuit system power supply 76 responds to turn on the power to each part of the apparatus. As a result, the motor 44 that drives the magnetic disk 42 as a rotary recording medium is activated by a drive signal from the servo circuit 50 described later, and the AF lens 11 that receives the control signal from the control circuit 20 causes the taking lens system 10 to operate. It is driven in the optical axis direction and automatic focusing is performed.

Further, the control circuit 20 operates so as to perform shutter release, photographing, and recording in the next stroke of the button 22. With such a configuration, it is configured to avoid power consumption of a power source such as a battery.

The control circuit 20 is supplied with mode switching signals MCS1 and MCS2 for switching the shooting mode. The mode switching signals MCS1 and MCS2 are electronic viewfinder adapters (hereinafter referred to as EVF adapter It is also configured to occur when the movie adapter is attached to the camera body.

In the electronic still camera according to the present embodiment, the normal mode,
Shooting in each of the shooting modes EVF mode, movie still mode, and movie camera mode is possible, but the shooting operation in the EVF mode is not directly related to the gist of the present invention, and a description thereof will be omitted.

When shooting stills using the optical viewfinder of the electronic still camera body, it is in normal mode.When the EVF adapter is attached to the camera body, the mode is switched to EVF mode, and when the movie adapter is attached, the movie mode is set. It can be switched to (including movie still mode and movie camera mode).

At the focal plane of the optical system 24, a solid-state image pickup device 26 having a two-dimensional image pickup cell array such as CCD is arranged.
In response to a drive signal including a vertical synchronizing signal and a horizontal synchronizing signal sent from the synchronizing signal generating circuit 18 through a control line 30, a video signal corresponding to a subject image formed on the image pickup surface 28 is accumulated, and Is output to the output line 32 as a serial signal.

The output line 32 of the image pickup device 26 is connected to the recording signal processing circuit 34. The recording signal processing 34 responds to a drive signal including a vertical synchronizing signal and a horizontal synchronizing signal sent from the synchronizing signal generating circuit 18 through a control line 36 and a phase pulse PG described later, and further sends from the control circuit 20 through a control line 35. A circuit for frequency-modulating the image pickup signal output from the solid-state image pickup device 26 by raster scanning in response to the recorded instruction signal, and outputting it to the output line 37 as a modulated video signal of a predetermined format. The output line 37 is connected to a magnetic recording head 40 via a recording amplifier 38.

The magnetic recording head 40 is a magnetic conversion element which is carried by a head transfer mechanism conceptually indicated by a dotted line 92, and is transferred onto an empty track of the magnetic disk 42 by the head transfer circuit 90 to record a video signal on it. The head transfer circuit 90 is controlled by the control circuit 20. The magnetic disk 42 has a core 48, and the core 48 is detachably attached to a rotary shaft 46 driven by a spindle motor 44, and is stationary in a predetermined direction by a motor 44, a frequency generator (FG) 54 and a servo circuit 50. Rotate.

The magnetic disk 42 has a track pitch of about 100 μm, that is, a track width of about 50 to 60 μm and a guard band width of 50 to 40 μm on a magnetic recording sheet having a small diameter of about 47 mm, for example.
About 50 tracks are recorded. The motor 44 drives the magnetic disk 42 at a predetermined rotation speed N of, for example, 3,600 rotations per minute.
It rotates at a constant speed, which enables recording of a video signal at a field or frame speed.

The core 48 is provided with a phase generator 52 for generating one phase pulse PG at a predetermined reference rotation phase (angle) per one rotation of the disk 42. A detection coil 56 is arranged near the core 48, and this is a detector that outputs a phase pulse PG to the signal line 58 when the phase generator 52 passes near the coil 56. The signal line 58 is connected to one input ends of the control circuit 20, the signal processing circuit 34, and the AND gate 60.

The servo circuit 50 supplies the drive current of the motor 44 to the connection line 62, and the frequency signal FG generated by the frequency generator 54 on the signal line 64.
And the reference clock received from the reference generation circuit 68 on the signal line 66.
It is a motor control circuit having a phase locked loop (PLL) that controls the rotation speed and rotation phase of the motor 44 according to CLK1. As a PLL control circuit, for example, Toshiba model TC9142P
An integrated circuit for motor control such as is used.

In the frequency generator 54, in this embodiment, the repetition frequency of the signal FG is an integer fraction of the frequency of the color subcarrier of the video signal,
Well higher than that of the phase pulse PG. For example, it is set to take a value about 20 times higher.

The reference generation circuit 68 has a crystal oscillation element 70 that generates a clock with a stable frequency, and divides this to generate a reference clock CLK2 of 14.3 MHz, and further divides this to generate a frequency corresponding to a color subcarrier ( 3.58MHz) CLK1 output line 7
This is the circuit generated in 2 and 66.

The servo circuit 50 has a lock detecting circuit 100. The lock detecting circuit 100 counts the cycle or frequency of the frequency signal FG by the reference clock CLK1, and the motor 44 maintains a predetermined rotation speed N within a predetermined allowable range. There is. That is, "lock"
It is a circuit that detects whether or not the state is present. An example of the configuration is shown in FIG.

In FIG. 2, the lock detection circuit 100 is configured by connecting flip-flops (FF) 102 and 114, AND gates 104 and 106, a binary counter 108, and comparators 110 and 112 as shown in the figure. There is.

The lock detection circuit 100 has a third
As can be seen, the frequency signal FG received on signal line 64
The period of the frequency signal FG is counted by using the output 116 obtained by dividing the frequency of (Fig. 3 (a)) by 1/2 in the flip-flop 102, and the period is included in the predetermined range L (Fig. 4). When output 74
Is a circuit that sets to a high level.

More specifically, one input 116 of the AND gate 104 is energized by the frequency signal FG divided by 1/2 (FIG. 3 (b)), while the other input 116 is at the high level. input
The 66 reference clock CLK1 appears at its output 120 (the same (c)). The counter 108 counts this and outputs the count data to the output 118 (the same (d)). Counter 108
It is reset when the flip-flop 102 is reset.

The two comparators 110 and 112 are circuits for comparing the count data 118 with reference values L1 and L2, respectively, and a weighted logical comparison circuit such as Toshiba model TC4063BP / BF is used. These reference values L1 and L2 are set around a predetermined steady rotation speed N, for example, 3600 rpm, so as to define a predetermined lock range L of rotation of the motor 44 as shown in FIG. This range L is advantageously set to, for example, about 2H period.

Since the value of the output data 118 of the counter 108 has an inverse relationship with the rotation speed of the motor 44, the relationship between the two is a straight line 200 in FIG.
Is plotted. Therefore, when the output data 118 is in the range L, the outputs 120 and 122 of both comparators 110 and 112 are high level, and the output of the AND gate 106 is high level. Therefore, flip-flop 114 is set and its output 74 goes high. This is a lock detect signal 75 which indicates that the rotation of the motor 44 is "locked" at a predetermined rotational speed.

The output 74 of the lock detection circuit 100 is fed through the set input S of the flip-flop 76 and the inverter 78 to the monostable circuit (M
M) 80 is connected. The output 82 of the latter is connected to an audible signal generator 84 such as a piezoelectric element, and the lock detection circuit 100
Output 74 goes from high to low for a certain period of time,
The generator 84 is energized and an audible alarm is output.
Instead of or in addition to the audible alarm, a visual display device that outputs a visual display may be used.

On the other hand, the lock signal 75 is also supplied to the control circuit 20 via the control line 91.

The Q output 85 of the flip-flop 76 is connected to another input of the AND gate 60, and the output 86 of the latter is connected to the reset input R of the flip-flop 76 and the reset input of the synchronizing signal generating circuit 18. As can be seen from this configuration, when the output 74 of the lock detection circuit 100 becomes high level, that is, when the lock detection signal 75 is output, the flip-flop 76 is set and one input 85 of the AND gate 60 is activated. It Therefore, the first phase pulse detected by coil 52 thereafter.
PG passes through the gate 60 and is input as a reset pulse 88 to the synchronization signal generation circuit 18, which resets the circuit 18.
Further, the analog switches 150 and 152 are switches for switching the phase input information and phase reference signal of the servo circuit 50 which performs servo control of the spindle motor 44 between the normal mode and the movie still mode, and are switched by the control signal from the control circuit 20. It is designed to be used. In the normal mode, the switches 150 and 152 are in the positions indicated by solid lines, and the signal FG is selected as the phase input information and the internal reference signal is selected as the phase reference signal. Further, in the movie still mode, the switches 150 and 152 are switched to the dotted line side, the signal PG is selected as the phase input information, and the sync signal output from the sync signal generating circuit is selected as the phase reference signal. As described above, in the normal mode, the synchronizing signal generating circuit 18 is reset by the reset pulse 88 with the signal FG as a reference, and this reset operation synchronizes the signal FG with the vertical synchronizing signal output from the synchronizing signal generating circuit 18. . On the other hand, in the movie still mode, the rotation cycle of the servo circuit 50, and eventually the spindle motor 44, can be taken for the vertical synchronizing signal.

The sync signal generation circuit 18 is a reference clock of the clock input 72.
It is a circuit that self-generates various periodic control signals from CLK2 and outputs them to the output lines 30 and 36. For example, the output line
A sensor drive signal including a 15.7 KHz pixel clock for driving each image pickup cell of the image pickup device 26 to output accumulated charges and a synchronization signal are output to 30. A recording control signal for controlling the recording signal processing circuit 34 and synchronizing signals such as a 60 Hz vertical synchronizing signal and a horizontal synchronizing signal are output to the output line 36.

The synchronization signal generation circuit 18 is reset to the initial state by the reset pulse 88. Therefore, after confirming the reset time, various control signals can be output in a predetermined cycle with the confirmed phase. In the present embodiment, these control signals and synchronization signals are vertical synchronization signals located after a predetermined period, for example, 7H period, from the phase pulse PG, and one unit, for example, one field (1V) still image video signal from that position. Is recorded on one track of the disc 42,
Output to control lines 30 and 36. Therefore, the magnetic disk 42
Unless there is a large fluctuation in the rotation of, the subsequent vertical synchronization signal is generated in synchronization with the pulse PG with a delay of substantially 7H. For example, a model MN6064 manufactured by Matsushita Electric Industrial Co., Ltd. is advantageously applied to the synchronization signal generation circuit 18.

Next, regarding the mode switching signal generation circuit for generating the mode switching signals MCS1 and MCS2 for switching the shooting mode from the normal mode to the EVF mode or the movie mode when the EVF adapter or the movie adapter is attached to the electronic still camera body, FIG. 5 Will be described. In the figure, a mode switching signal generation circuit 310 is provided in the camera body 300, and the circuit 310 is composed of comparators 312 and 314, inverters 316 and 318, an AND gate 320, and resistors R1 to R4. For the sake of convenience, the resistance values of the resistors R1 to R4 are represented by the same symbols, and R1 = R2 = R3 and R4> R1 + R2 + R3. The inverting input terminals of the comparators 312 and 314 have high resistance R4.
Through the grounded non-inverting input terminal is in a voltage V _2, V ₁ to the power supply voltage Vcc is divided by the resistors R1-R3. The terminal 322a of the female connector 322 provided on the camera body 300 is connected to the inverting input terminals of the comparators 312 and 314.
322b is grounded.

On the other hand, the EVF adapter 400 is provided with a female connector 410 to be attached to the connector 322, and the connector pin 410
b is grounded, and the power supply voltage Vcc is
The voltage V ₂ 'is supplied divided by R5 to R7. Further, the movie adapter 500 is also provided with a male connector 510 to be attached to the connector 322, the connector pin 510b of the connector 510 is grounded, and the power supply voltage Vcc is divided by the resistors R5 to R7 to the connector pin 510a. Voltage V ₁ 'is supplied.

The voltages V ₁ , V ₁ ′, V ₂ and V ₂ ′ thus set are V ₁
<V ₁ ′ <V ₂ <V ₂ ′ <Vcc. Therefore, the outputs of the comparators 312 and 314 are in a high level state when the EVF adapter 400 or the movie adapter 500 is not connected to the camera body 300. Therefore, the outputs of the inverter 316 and the AND gate 320 are both low level,
The mode switching signals MCS1 and MCS2 are not output to the control circuit 20.

Next, when the EVF adapter 400 is attached to the camera body 300,
The voltage at the inverting input terminals of the comparators 312 and 314 becomes V ₂ ′, and V ₂ ′> V ₂ > V ₁ , and therefore the outputs of the comparators 312 and 314 are inverted.

As a result, only the output of the inverter 316 becomes high level, and the mode switching signal MSC1 is output to the control circuit 20.

On the other hand, when the movie adapter 500 is attached to the camera body 300, the voltage at the inverting input terminals of the comparators 312 and 314 is V ₁ ′.
From the relationship of V ₁ <V ₁ ′ <V ₂ , the output of only the comparator 314 is inverted from the high level to the low level, and the output of the comparator 312 remains at the high level. As a result, only the mode switching signal MCS2 is output from the AND gate 320 to the control circuit 20.

In this way, in the control circuit 20, the mode switching signals MCS1 and MC
From the combination of the output states (high level or low level) of S2, it is determined which adapter is attached to the camera body 300, and various controls are performed according to the corresponding shooting mode.

Here, when the movie adapter 500 is attached to the camera body 300, one of two shooting modes, movie still mode and movie camera mode, can be selected. This selection is a mode switch provided on the movie adapter 500. It is performed by an operation (not shown).

The movie adapter 500 converts the video signal output (luminance signal and color difference signals RY and BY) from the camera body 300 into a video signal, and also converts the power supply from the outside into a voltage of a predetermined level to the camera body. Power is supplied to each circuit in 300.

As a video signal output, a video signal for an electronic viewfinder is output.

FIG. 6 (A) is a front view and a side view showing a mounted state of the camera body 300 and the EVF adapter 400, and FIG. 6 (B) is a front view and a side view showing a mounted state of the camera body 300 and the movie adapter 500. It is a figure.

Next, the operation of the electronic still camera according to the present invention will be described based on the timing charts shown in FIGS. 7 and 8.
FIG. 7 shows an operation example in the normal mode. In FIG. 7, when the release button 22 is operated at time t1, the switch SW1 is first closed ((a) in the same figure). At this time, power is supplied to each circuit diagram of the present device, and the brightness information of the subject from the photometric element 16 is taken into the control circuit 22, and
The spindle motor 44 is driven by the drive signal from the servo circuit 50.
Also starts rotating ((k) in the same figure). At the same time AF motor
11 is continuously driven in response to a control signal from the control circuit 20 to move the taking lens system 10 in the optical axis direction for automatic focusing ((l) in the same figure). Here, the automatic focusing by the AF motor 11 is configured so that it can be continuously controlled from the time the spindle motor 44 is activated to the time it is locked, but once the subject is in focus, the shooting lens system will not move unless the subject moves. At that point, the driving of the AF motor 11 is stopped.

As the rotation speed of the spindle motor 44 increases, the coil 56 begins to output the phase pulse PG, and the repetition cycle thereof gradually becomes shorter. At the same time, the frequency signal FG generated by the frequency generator 54 also has a shorter cycle, and eventually enters the “locked” state. That is, when the rotation speed of the motor 44 approaches the predetermined value N and the count value of the counter 108 falls within the predetermined lock range L, the lock signal 75 is output from the detection circuit 100, which sets the flip-flop 76. One of the inputs of gate 60 is activated. The lock signal 75 is also input to the control circuit 20 through the control line 91.

In this state, for example, when the phase pulse PG arrives from the coil 56 at time t2, the output of the gate 60 becomes high level, and the reset pulse 88 is output to the synchronization signal generation circuit 18. As a result, the vertical synchronization signal is reset at time t3 ((j) in the figure), and after time t3, the vertical synchronization signal is output substantially in synchronization with the phase pulse PG.

On the other hand, in response to the input of the lock signal 75, the control circuit 20 can read the signal indicating the state of the switch SW2 ((b) in the figure).

Next, for example, as shown in FIG. 7 (b), when the release button 22 is further pressed at time t4 and the release switch SW2 is closed, the control circuit 20 rotationally drives the aperture motor 13 and the aperture 12 The aperture control is started so that the aperture value becomes a predetermined aperture value based on the brightness information of the subject captured from the photometric element 16, the mirror 15 is flipped up, and the exposure preparation is completed ((d) and (e) in the same figure). ). Further, when the driving of the aperture mirror 13 is stopped at time t5, the shutter 14 is opened, the image pickup surface 28 of the solid-state image pickup device 26 is exposed, and a video signal corresponding to the subject image formed on the image pickup surface 28 is generated. The data is accumulated in the solid-state image sensor 26 and is read out in synchronization with the vertical synchronizing signal. The recording signal processing circuit 34 receives the control signal from the control circuit 20 in synchronization with the reading period of the solid-state image sensor 26, and the recording signal processing circuit 34 outputs the video signal read from the solid-state image sensor 26 to the magnetic disk 42.
After the recording, the content recorded on the magnetic disk 42 is checked at the time (time t8) when a period of 0.5 V has elapsed from the end of the recording (time (t8)). Further, at time t9, the head phase circuit
The head 40 is fed forward by one track from 92 ((i) in the same figure).

Next, the operation of the movie still mode will be described with reference to the timing chart of FIG. Time in the figure
At t1, the movie adapter 500 is attached to the camera body 300,
Moreover, when the power switch of the movie adapter (not shown) is closed and the movie still mode is selected by the mode switch provided in the movie adapter 500,
The switches 150 and 152 are switched to the dotted line side by the control signal from the control circuit 20, the phase input information in the servo circuit 50 is switched from the FG reference to the PG reference, and the phase reference signal is changed from the internal reference signal to the synchronization signal generator. Switches to the output vertical sync signal. Then, the mode switching signal generating circuit in the camera body 300 sends the mode switching signal MCS2 to the control circuit 20.
Is output and power is supplied to each circuit unit. As a result, the control circuit 20 starts taking in the brightness information of the subject from the photometric element 16, and the diaphragm motor 13 is rotationally driven by the control signal from the control circuit 20 to start diaphragm control ((c) in FIG. (D)). This aperture control is continuously performed as long as the movie still mode is designated. At the same time, the mirror 15 is flipped up in response to a control signal from the control circuit 20, the shutter 14 is opened, the driving of the solid-state image pickup device 26 is started, and a subject image is formed on the image pickup surface 28 of the device 26. It is imaged ((e), (f), (g) in the figure).
From this time t ₁ , the synchronization signal generating circuit 18 to the fixed image sensor 26
A video signal is read from the solid-state imaging device 26 in units of one field in synchronization with a vertical sync signal ((k) in the same figure) output to the video signal, and the video signal is converted into a video signal by the movie adapter 500 and externally output. The video signal is also output to an electronic viewfinder (not shown) mounted on the camera body 300 ((g), (j)).

In this way, the subject image is displayed on the electronic viewfinder. After the photographer confirms the subject image with the electronic viewfinder and operates the release button 22 at time t2 to close the release switch SW1 ((a) in the figure), the spindle motor 44 is rotationally driven. At the same time, the AF motor 11 is also driven to rotate periodically, and the shooting lens system
10 automatic focusing is performed ((l) in the figure,
(M)).

Further, the rotation speed of the spindle motor 44 increases and approaches the predetermined value N as in the normal mode, and the counter 108
When the count value of is included in the predetermined lock range L, the lock signal 75 (not shown) is output from the detection circuit 100 at time t3.
Is output from. After that, when the release button 22 is further pressed at time t5 and the release switch SW2 is closed ((b) in the figure), the time is from t5 to t6 in synchronization with the read cycle of the video signal from the fixed image sensor 26. The video signal read from the image sensor 26 during the period of time is recorded on a predetermined track of the magnetic disk by the magnetic head 40 via the recording signal processing circuit 34, and a predetermined time (for example, 0.5 V) has elapsed from time t6. At t7, the recorded contents are checked ((h) in the same figure).

Further, when the release switch SW2 is closed at time t8, at the same time, the drive signal from the head transfer circuit 90 moves the magnetic head 40 forward by one track from the current track ((i) in the figure). , To prepare for the next shooting.

As can be seen from the above description, the shooting operation in the movie still mode is different from that in the normal mode. (1) Power supply to each part of the circuit is performed at the time when the movie still mode is switched, and (2) Photometry for the subject. Is always performed from the time of power supply, (3) The aperture control is always performed, (4) The mirror 15 is placed in a state of being flipped up from the time of power supply, and (5) the shutter 14 is the power source. Always be left open from the time of supply,
(6) The solid-state image pickup device 26 is controlled so that the signal charge, that is, the video signal is always read out in synchronization with the vertical synchronizing signal from the time of power supply, (7) Spindle motor 44
Is to rotate in synchronization with the vertical synchronizing signal output by the synchronizing signal generating circuit.

These differences are due to the fact that it is necessary to always output a video signal to the outside in the movie still mode.

As described above, according to this embodiment, shooting can be performed in both the normal mode and the movie still mode.

〔The invention's effect〕

As described above, in the present invention, the movie adapter is configured to be attachable to the electronic still camera body, and the exposure means is provided in accordance with the photographing mode based on the mode switching signal indicating whether the movie adapter is attached or not attached, Since the recording means and the image pickup means are controlled, according to the present invention, the photographing mode can be switched between the normal mode and the movie still mode for use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic still camera according to the present invention, and FIG. 2 is a block showing a configuration example of a lock detection circuit of the embodiment shown in FIG. Figure, Figure 3 is the second
Timing chart showing signal waveforms appearing in each part of the circuit shown in the figure, FIG. 4 is a bluff for explaining the operation of the circuit of FIG. 2, and FIG. 5 is mounting of an electronic still camera body and an EVF adapter or movie adapter. A circuit diagram showing a mode switching signal generating circuit for generating a mode switching signal at times.
Figures (A ₁ ) and (A ₂ ) are a front view and a side view showing a state in which the electronic still camera body and the EVF adapter are mounted, the same figure (B ₁ ),
(B ₂ ) is a front view and a side view showing the mounting state of the electronic still camera body and the movie adapter, FIG. 7 is a timing chart showing the operation of the electronic still camera in the normal mode, and FIG. 8 is a movie still of the electronic still camera. 6 is a timing chart showing an operation in a mode. 11 ... AF motor, 12 ... Aperture, 13 ... Aperture motor, 14 ...
… Shutter, 15 …… Mirror, 18 …… Sync signal generator,
20 ... Control circuit, 22 ... Shutter release button, 26 ...
Image sensor, 34 Recording signal processing circuit, 40 Magnetic head, 42 Magnetic disk, 44 Spindle motor, 50
…… Servo circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Konishi Inventor Masahiro Konishi 2-26-30 Nishiazabu, Minato-ku, Tokyo Fuji Shashin Film Co., Ltd. In the photo light machine Co., Ltd. (72) Inventor Kazutsugu Ogata 1-324, Uetakecho, Omiya City, Saitama Prefecture In the Fuji photo light machine Co., Ltd. (56) Reference JP-A-58-163929 (JP, A) JP-A-SHO 60-165875 (JP, A)

Claims (1)

[Claims] 1. A mode switching means for switching between a normal mode and a movie still mode, an exposing means for exposing a subject image to an image pickup means, and a subject image exposed by the exposing means by photoelectric conversion to correspond to the subject image. An image pickup means for reading the image signal, a recording means for recording one frame of the image signal read from the image pickup means on one track of a rotating rotating recording medium, a driving means for rotating the rotating recording medium, and the rotating recording A frequency signal generating means for generating a frequency signal indicating the rotation speed of the medium, and a phase generating member provided on the rotary recording medium are detected to generate one phase pulse every one rotation of the rotary recording medium. The phase pulse generating means and the drive unit so that the frequency signal in the normal mode coincides with a preset stationary frequency. Servo means for controlling the driving means so that the frequency signal coincides with a stationary frequency in the movie still mode and the phase pulse coincides with a vertical synchronizing signal output from the synchronizing signal generating means. , A lock detection signal is output when the frequency signal matches the steady frequency in the normal mode, and a lock detection signal is generated when the frequency signal matches the steady frequency and the phase pulse matches the vertical synchronization signal in the movie still mode. Lock detection means for outputting and a synchronization signal generation means for outputting a synchronization signal including a vertical synchronization signal to the image pickup means and the recording means, wherein the first phase pulse after the lock detection signal is input in the normal mode When input, the sync signal that resets and starts the sync signal at the input of the phase pulse A generator is provided, and a controller that controls the drive unit, the exposure unit, the imaging unit, and the recording unit, and the control unit activates the drive unit and outputs the exposure instruction when the activation instruction is input in the normal mode. When you type
In addition to operating the exposure means, at least after inputting a lock detection signal from the lock detection means, the image pickup means and the recording means are operated, and in the movie still mode, the exposure means and the image pickup means are operated to externally operate via an interface. When the video signal is output to and the activation instruction is input, the drive unit is activated, and when the exposure instruction is input, the recording unit is operated at least after the lock detection signal is input from the lock detection unit. Electronic still camera.