JPH0287882A - Electrode still camera - Google Patents

Abstract

PURPOSE:To record a video signal from the outside without delaying a rise of a rotating speed of a disk, and also, without complicating a circuit constitution by providing an output terminal for outputting a reference signal synchronized with a rotational phase of the disk, and an input terminal for inputting an external video signal synchronized with the reference signal. CONSTITUTION:The title camera is provided with an output terminal 90 for outputting a reference signal synchronized with a rotational phase of a disk 40, and an input terminal 80 for inputting an external video signal synchronized with the reference signal. In this state, a recorder part 402 of the electronic still camera inputs a reference signal outputted from a synchronizing signal generating circuit 60 and a servo-circuit 41 to a servo-circuit 141 of an image reproducing device 401, and inputs an image signal reproduced by this reference signal to an external signal input terminal 80 of a recorder part 401. In such a way, an external video signal can be stored without delaying a control of the speed of revolution and a phase synchronization of the disk 40, and also, without complicating a circuit constitution.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic still camera that records still images on a magnetic recording medium such as a magnetic sheet using an optical system including a solid-state image sensor (CCD). be.

[Background of the invention]

FIG. 7 shows a block diagram of a conventional electronic still camera. In the figure, a solid-state imaging device (hereinafter referred to as a CCD) 20 is used instead of a film. The CCD photoelectrically converts light received by a light receiving section into electric charge, and this electric charge is accumulated in a depletion layer in the substrate of the CCD 20. The magnetic disk 40 is a magnetic recording device that rotates a disc-shaped magnetic sheet 43, and can store about 50 frames of still images in conjunction with the movement of the shutter 11. Instead of negative film, a CCD 20 and a magnetic sheet 43 in a video floppy are used to record images.

When the release 51 is pressed, the system control circuit 50 outputs a set signal to the servo circuit 41. Servo circuit 4
1 drives the motor 42 to increase the number of rotations of the magnetic disk 40 to a predetermined number of rotations. When the rotational speed of the magnetic disk 40 reaches a predetermined value, the servo circuit 41 outputs a reset signal to the synchronization signal generation circuit 60.

This reset signal is a single pulse that has a certain phase relationship with the PC signal indicating that the PC yoke on the magnetic sheet 43 has been detected, and the phase of the PG multiplied signal magnetic sheet 43 starts memory of one frame image. This is a signal indicating that the vehicle is in a position to

The operation of the synchronizing signal generating circuit 60 is disrupted when a reset signal from the servo circuit 41 is input. After waiting for this disturbance in the synchronizing signal generating circuit 60 to stabilize, the shutter 11 is released at a preset shutter speed and aperture. As a result, reflected light from the object is focused by the photographing lens 10 and imaged on the photodiode of the light receiving section of the CCD 20, and a charge corresponding to the intensity is generated and accumulated by the photoelectric conversion action.

After the exposure is completed, recording starts from the first PG signal, and then at the first read timing (specific timing during vertical blanking, which varies depending on the COD model), charge is transferred from the light receiving section to the vertical transfer COD. Move. Thereafter, by applying pulses to the vertical transfer COD and horizontal transfer CCD, the signals are sequentially read out, processed, and recorded on the magnetic sheet 43 in the video floppy. This recording ends with the next PG.

The signal processing circuit 22 performs signal processing on the image signal and outputs it to the FM modulation circuit 30. The FM modulation circuit 30 performs frequency modulation on this image signal and outputs it to the head amplifier 31. Based on the control signal from the system control circuit 50, the head amplifier 31 outputs an image signal to the throat 32 during the period from the first PG to the next PG after the end of exposure.

The image signal input to the head 32 is a current, and a magnetic field is generated in the head 32 by this current. The strength of the magnetic field generated in the head 32 is stored as a magnetic signal in the magnetic sheet 43 of the rotating magnetic disk 40 by the servo circuit 41. By synchronizing the phase of the image signal with the rotational phase of the magnetic disk 40 in this way, the image signal can be quickly stored in the magnetic sheet 43 of the magnetic disk 40.

Such electronic still cameras are now required to also record image information based on external signals. As a recorder for recording image information from the outside, a recorder as shown in FIG. 5 is generally used.

An image information reproducing device 501 that reproduces image information and a recorder 502 that records the image are connected to a code 5 that sends a video signal.
03.

In the image reproducing device 501, the servo circuit 141 drives the motor 142 based on the clock frequency of the clock pulse from the synchronization signal generation circuit 160 to generate the magnetic disk 140.
Raise the rotation speed to the specified rotation speed. The reproducing circuit 110 reads the image signal stored in the magnetic sheet 143 via the head, generates a video signal from this image signal, and outputs it to the recorder 502 via the code 503.

In the recorder 502, the video signal input to the external input terminal 80 via the cord 503 is transmitted to the recording circuit 100.
The synchronization signal is branched and inputted to the video signal and the synchronization separation circuit 70, the synchronization separation circuit 82 separates the synchronization signal from the video signal, and this synchronization signal is inputted to the servo circuit 45. The servo circuit 45 drives the motor 42 based on the tarok frequency of the synchronization signal to increase the rotation speed of the disk 40 to a predetermined number. The rotational phase of the magnetic disk 40 is rotated by a servo circuit 45 in synchronization with the phase of the video signal. On the other hand, the recording circuit 100 performs signal processing on the image signal included in the video signal. This image signal is sent to the magnetic disk 4 as a magnetic signal via a head etc.
It is memorized in the magnetic sort 43 plane of o.

[Problem that the invention seeks to solve]

The electronic still camera shown in FIG. 6 is an electronic still camera that adopts the concept of recording image signals from outside the recorder. This electronic still camera records both an image signal obtained by photoelectrically converting light from a photographing lens IO using a CCD 20 and an external video signal inputted via an external input terminal 80. The switch 200 connects an image signal and C from a signal processing circuit 81 that performs signal processing on an image signal included in an external video signal.
, the image signal from the CD 20 and the FM modulation circuit 30.
Switch to connect. The switch 201 connects a synchronization signal separated from an external video signal and a synchronization signal generation circuit 60.
The clock pulse from the servo circuit 45 is switched and input to the servo circuit 45. Components having the same configuration as the electronic still camera shown in FIG. 7 are given the same reference numerals.

The electronic still camera inputs a video signal consisting of an external image signal and a synchronization signal through an external input terminal 80, separates a synchronization signal from this video signal in a synchronization separation circuit 70, and switches this synchronization signal to a switch. A switching input is made to the servo circuit 45 by 201. Further, a signal processing circuit 81 performs signal processing on a video signal input from an external input terminal 80, and this video signal is switched and input to the FM modulation circuit 30 by a switch 201.

As mentioned above, the electronic still camera has the problem that the rotation speed and phase control of the magnetic disk is slow because it uses the rotation speed and phase reference signals of the magnetic disk separately from the external video signal. There is a problem that the circuit configuration becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic still camera that is capable of storing external video signals without slowing disk rotational speed control and phase synchronization and without complicating the circuit configuration.

[Means for solving problems]

The above object is to provide an electronic still camera that records a still image by synchronizing the phase of a video signal with the rotational phase of the disk by synchronizing the phase of a synchronization signal generation circuit with the rotational phase of the disk. This is achieved by an electronic still camera characterized by comprising an output terminal for outputting a synchronized reference signal and an input terminal for inputting an external video signal synchronized with the reference signal.

[For production]

The present invention is an electronic still camera having a function of recording an external video signal, which is characterized by a coupling relationship when recording an external video signal, and an image reproducing device for reproducing the video signal. FIG. 4 shows the coupling relationship between the camera and the recorder section of the electronic still camera of the present invention.

The recorder section 402 of the electronic still camera of the present invention inputs a reference signal outputted from the synchronization signal generation circuit 60 and the servo circuit 4-1 to the servo circuit 141 of the image reproducing device 401, and reproduces an image signal using the reference signal. is input to the external signal input terminal 8o of the recorder section 401.

The phase of the video signal here is read on the magnetic disk 4 during playback.
It is synchronized with the rotational phase of 0.

〔Example〕

FIG. 1 shows a first embodiment of an electronic still camera according to the present invention, and is a block diagram showing an outline of its configuration.

In the embodiments of the present invention, circuits having the same functions as those explained in FIGS. 7 and 4 are designated by the same reference numerals.

The characteristic configuration of this embodiment includes an external input terminal 90 for inputting a video signal from an image reproduction device (hereinafter referred to as an external video signal), and a signal processing circuit 91 connected to the external input terminal 90.
Furthermore, an external output terminal 90 is provided for outputting a PG multiplied signal indicating the rotational phase of the magnetic disk 40 on which an external video signal is recorded.

In this camera, when the release 51 is used as a camera, it outputs a command signal to increase the rotation speed of the magnetic disk 4o to a predetermined rotation speed, and the shutter 11 is activated at a preset shutter speed and aperture. It has the function to release and then record, but release 5
1 is a magnetic disk 4 when dubbing a video signal.
It has a function of outputting a command signal to increase the 0 rotation speed to a predetermined rotation speed and then perform recording.

In this embodiment, the PG output from the external output terminal 9o
This double signal indicates that the PG yoke on the surface of the magnetic sheet 43 has been detected, and this PG double signal is a signal indicating that the phase of the magnetic disk 40 is at the position to start recording one frame of image.

To dub an external video signal, switch the input selector switch 200 to the external input side, and connect the external input terminal 80.
A signal processing circuit 81 performs signal processing on an image signal included in a video signal outputted from the image reproducing apparatus shown in FIG.

Here, when the release 51 is pressed, the system control circuit 50 inputs a set signal to the servo circuit 41. The servo circuit 41 outputs a PG double signal from an external output terminal 90,
At the same time, the servo circuit 41 quickly raises the rotation speed of the magnetic disk 40 to one revolution in 1/60 sec based on the tarok frequency of the clock pulse from the synchronization signal generation circuit 60.

In the image reproducing apparatus that receives the PG multiplied signal from the external output terminal 90, the PG signal indicating the rotational phase of the magnetic disk 40 of this embodiment is used.
A video signal consisting of an image signal and a synchronization signal is reproduced as a double signal reference signal. Therefore, the video signal input from the external input terminal 80 is already synchronized with the rotational phase of the magnetic disk 40.

This video signal is input via the cord to the external input terminal 80 described above. A video signal consisting of an image signal and a synchronization signal is input from the external input terminal 80 to the signal processing circuit 8I. The signal processing circuit 22 performs signal processing on the image signal and outputs it to the FM modulation circuit 30. The FM modulation circuit 30 performs frequency modulation on this image signal and outputs it to the head amplifier 31.

The synchronization signal generation circuit 60 is the system control circuit 50
Outputs clock pulses to [System control] Roll time t150 inputs a control signal to the head amplifier 31.

The head amplifier 31 records the video signal as a magnetic signal frame by frame on the magnetic sheet 43 of the magnetic disk 40 via the head 32 based on the clock frequency of the clock pulse.

Further, when photographing a still image with the electronic still camera of this embodiment, the input changeover switch 200 is switched to the internal input side. Thereby, this electronic still camera can photograph and record still images as explained in FIG.

FIG. 2 is a block diagram showing a general configuration of an electronic still camera according to a second embodiment of the present invention, in which a composite synchronization signal is output from an external output terminal 91. The composite synchronization signal is output from the synchronization signal generation circuit 60. The composite synchronization signal is a combination of a vertical synchronization signal and a horizontal synchronization signal. The other configurations are the same as in FIG. 1.

The signal format of the video signal includes a vertical synchronization signal and a subsequent image signal, which are repeated. In an electronic still camera, the phase difference between the PG double signal video signal, which indicates the rotational phase of the magnetic disk, and the vertical synchronization signal is 7H±2H.
There is a relationship between The rotational phase of the magnetic disk can be easily calculated from the vertical synchronization signal. Therefore, the vertical synchronization signal is used as a reference signal for phase synchronization of video signals.

In this way, video equipment unrelated to the methylvideo standard, such as a video camera that can be synchronized externally, can be connected, expanding the range of video equipment that can be connected.

FIG. 3 is a block diagram showing an outline of the configuration of an electronic still camera according to a third embodiment of the present invention.
Two external output terminals 92a and 92b are provided to output a vertical synchronization signal and a horizontal synchronization signal. The other configurations are the same as those in FIGS. 1 and 2.

Some video cameras capable of external synchronization require a vertical synchronization signal and a horizontal synchronization signal instead of a composite synchronization signal. This embodiment can be applied to such a camera.

〔Effect of the invention〕

The present invention makes it possible to synchronize the phase of the input video signal with the rotational phase of the disk without slowing down the rise in the rotational speed of the disk and without complicating the circuit configuration. As a result, an electronic still camera that can record external video signals, has a simple circuit configuration, is inexpensive, and is small has been realized.

[Brief explanation of the drawing]

1 to 3 are block diagrams showing three embodiments of an electronic still camera according to the present invention, FIG. 4 is a block diagram showing the basic concept of the present invention, and FIG. 5 is a block diagram showing a recorder having an external signal input circuit. FIG. 6 is a block diagram showing the configuration of an electronic still camera with an external signal input circuit added, and FIG. 7 is a block diagram showing the configuration of a conventional electronic still camera. It is a block diagram. IO...Photographing lens 11...Shutter 20...
・Solid-state image sensor (CCD) 2■...Solid-state image sensor (CCD) drive circuit 22.81
...Signal processing circuit 30...FM modulation circuit 31, .
131...Head 7' 32,132...Head 40.140...Magnetic disk 41,45,14
1... Servo circuit 42.142... Motor
43.143...Magnetic sheet 50...System control circuit 60.160...Sync signal generation circuit 51...Release 70...Sync separation circuit 80...External input terminal 9
0 to 92...External output terminal 100...Recording circuit 11
0... Playback circuit 200, 201... Switch 401.501... Image playback device 402... Recorder section

Claims (1)

[Scope of Claims] (1) An electronic still camera that records images by synchronizing the phase of a video signal with the rotational phase of the disk by synchronizing the phase of a synchronization signal generation circuit with the rotational phase of the disk. An electronic still camera comprising: an output terminal for outputting a reference signal synchronized with the rotational phase of the electronic still camera; and an input terminal for inputting an external video signal synchronized with the reference signal. (2) The electronic still camera according to claim 1, wherein the output terminal outputs a PG pulse. (3) Claim 1, wherein the output terminal outputs a composite synchronization signal.
Electronic still camera described. (4) The electronic still camera according to claim 1, wherein the output terminal outputs a horizontal synchronization signal and a vertical synchronization signal.