JPS62200988A - Electronic still camera - Google Patents

Abstract

PURPOSE:To attain surely phase servo operation by driving the magnetic disk of an electronic still camera by a velocity servo system having no phase servo function. CONSTITUTION:In the electronic still camera 1 in which the magnetic disk 2 is rotated and drived at a prescribed speed by the velocity servo system SP1 and a recording signal is recorded on the magnetic disk 2, there are provided rotating phase signal forming means 14, 15 for detecting the rotating phase of the magnetic disk 2 and transmitting a rotating phase detection signal DP1 as a phase reference signal PHREF1 to the phase servo system PH0 of a reproducing device 3 during a dubbing mode for dubbing the recording signal PBVD reproduced from the reproducing device 3 on the magnetic disk 2. Since the phase servo system is not provided in the driving system of the electronic still camera 1, a satisfactory rise characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an electronic still camera, which is capable of dubbing from, for example, a recording/playback deck (referred to as a recording/playback deck).

B. Summary of the Invention The present invention provides an electronic still camera that records video signals on a magnetic disk driven by a speed servo system.
When dubbing the reproduced video signal supplied from the reproducer, the phase information obtained from the rotary phase detector is sent as a phase reference signal to the phase servo system of the reproducer. The phase servo system can be used to realize the phase servo operation, thereby effectively avoiding the risk of losing the advantages of the electronic still camera during the recording operation.

C. Conventional technology In general, in an electronic still camera, the drive motor for the magnetic disk is equipped with a phase servo function in order to drive the magnetic disk to rotate and record the recording signal obtained from the camera circuit, etc. on the track for one revolution. A system that uses a speed servo system to rotate at a predetermined speed is adopted.

This method of using only the speed servo system focuses on the fact that the speed servo system generally has a short rise time and is not easily affected by fluctuations in the power supply voltage, and uses a fast response speed for the photo opportunity. This is applied to the camera that requires it.

In general, phase servo systems have a slow rise speed and are easily affected by fluctuations in power supply voltage, so when applied to electronic still cameras, it is necessary to avoid deterioration of the camera's characteristics. I can't get it.

Recorded signals recorded on a magnetic disk by this type of electronic still camera are reproduced using a dedicated reproduction deck.

This playback deck consists of a speed servo system that rotates the magnetic disk recorded by the electronic still camera at a predetermined reference speed (corresponding to the recording speed of the electronic still camera), and a reference phase provided by a reference phase generation source. It has a phase servo system that performs phase servo operation based on The recorded signal can be reliably read out by the playback deck.

D Problems to be Solved by the Invention By focusing on the fact that electronic still cameras have a recording circuit dedicated to recording, it is possible to reproduce recorded signals recorded on a magnetic disk mounted on a reproduction deck using an electronic still camera. The electronic still camera is configured so that it can be dubbed by recording, thus making the electronic still camera multifunctional.

In order to realize such a dubbing function, it is generally necessary to rotate the magnetic disk on the electronic still camera side so as to synchronize with the playback speed and phase of the playback signal played from the magnetic disk mounted on the playback deck. be. Therefore, in the past, a method was adopted in which a phase servo system was newly provided in addition to the speed servo system originally provided in electronic still cameras. In this way, the magnetic disk on the electronic still camera side can be rotationally driven so as to synchronize the speed and phase with the magnetic disk on the reproduction deck.

However, by doing this, it was possible to create an electronic camera that had a fast rise speed at the start of recording and was resistant to fluctuations in power supply voltage by using only the speed servo system, whereas the phase servo system Because of this provision, when the electronic still camera is operated in image-focusing mode, the advantages of fast startup speed and resistance to fluctuations in power supply voltage are lost.

The present invention has been made in consideration of the above points, and it is possible to use a playback deck during dubbing without sacrificing any of the advantages of operating an electronic still camera (i.e., fast startup speed and resistance to fluctuations in power supply voltage). The present invention attempts to propose an electronic still camera in which the magnetic disk of the electronic still camera can be driven to rotate in phase synchronization with the magnetic disk of the electronic still camera.

E Means for Solving Problem E To solve this problem, in the present invention, the magnetic disk 2 is rotated at a predetermined speed by a speed servo system SPI to record recording signals on the magnetic disk 2. In the electronic still camera l, in a dubbing mode in which the recorded signal PBV reproduced by the reproducing device 3 is dubbed onto the magnetic disk 2, the rotational phase of the magnetic disk 2 is detected and the rotational phase detection signal DP is transmitted to the reproducing device 3. Rotary phase signal forming means 14 and 15 are provided to send out the phase reference signal PH*t□ to the phase servo system PHO.

In the F-action dubbing mode, the electronic still camera 1 drives the magnetic disk 2 at a predetermined speed by the phase servo system SPI. During this dubbing mode, the rotational phase of the magnetic disk 2 is detected by the rotational phase signal forming means 14.15, and a phase reference signal PH for the phase servo system PHO of the reproducing device 3 is detected.
It is sent as +it□.

As a result, the electronic still camera 1 has a built-in speed servo system S
By utilizing the phase servo operation of the phase servo system PHO of the regenerator 3 in addition to the speed servo operation by the PI,
The magnetic disk 21 of the player 3 can be driven to rotate in synchronization with the rotational speed and rotational phase of the magnetic disk 2.

Therefore, since the drive system of the electronic still camera 1 is not provided with a phase servo system, the advantages of the speed servo system SPI (that is, the advantages of fast rise speed and resistance to fluctuations in power supply voltage) are not available in the imaging mode. It is possible to realize an electronic still camera with good start-up characteristics by using the same without any loss.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, reference numeral 1 denotes an electronic still camera, which is constructed so that a reproduced image signal reproduced by a recording/reproducing deck 3 can be dubbed onto a magnetic disk 2 thereof.

In the electronic still camera 1, the rotation speed of the magnetic disk 2 rotationally driven by the drive motor 4 is detected by the frequency signal generator 10, and its detection output DF is
The speed comparison circuit 12 compares the reference signal REF generated from the reference oscillator 11 with the speed error signal E.
R, is fed back to the drive motor 4 via the servo amplifier circuit 13. In this way, a speed servo system SPI for the drive motor 4 is formed.

The rotational phase of the magnetic disk 2 is detected by a rotational phase detector 14, and sent to the recording/reproducing deck 3 as a phase/phase reference signal PHIIE□ via an amplifier circuit 15. Thus, the rotational phase detector 14 and the amplifier circuit 14 constitute a rotational phase signal forming means.

In addition to this, the playback signal PB sent out from the recording/playback deck 3
v* is transmitted via the recording circuit 16 and further to the recording gate circuit 1.
7 to a recording head 18 opposing the magnetic disk 2, and is thus recorded on the magnetic disk 2.

The recording gate circuit 17 is controlled to be open for one field period by the gate control signal GATE generated in the timing circuit 19 when the phase reference signal PHIIEFI is sent from the rotational phase detector 14 via the amplifier circuit 15. Ru.

In addition, in the recording/reproducing deck 3, the rotational speed of the drive motor 22 that rotationally drives the magnetic disk 21 is determined by the frequency signal generator 2.
3, the frequency detection signal DF2 is given to the speed detection circuit 24, and a speed error signal E representing the difference between the frequency represented by the frequency detection signal DF and a predetermined reference frequency is generated.
R, is supplied to the servo amplifier circuit 26 via the adder circuit 25, thus causing the drive motor 22 to rotate at a predetermined reference speed. In this way, a speed servo system SP2 for the magnetic disk 21 is formed.

In addition, a rotational phase detector 27 is provided to face the magnetic disk 21, and its rotational phase detection signal DP,
is given to the phase comparator circuit 28 as a detection input.

The output of the switching circuit 29 is applied to the phase comparison circuit 28 as a reference input signal PHIIE□. The switching circuit 29 is
When the recording/reproducing deck 3 is in the recording mode, the synchronizing signal VD supplied from the outside is taken in from the input signal terminal a, and is supplied to the comparison circuit 28 as the reference input PH□.

The switching circuit 29 also controls the reference phase signal PH*tr generated from the reference phase generation circuit 30 in the horizontal writing reproduction mode.
s from the input signal terminal and sends it out as the reference input PH□W2 of the phase comparison circuit 28. Furthermore, switching circuit 2
9 selects the phase reference signal PH1□ applied to the signal input terminal C via the delay circuit 31 when the electronic still camera 1 is in the dubbing operation mode, and the reference manual power PHREF! of the phase comparison circuit 28 is input. Supply as.

Thus, the comparison circuit 28 has a detection input DP and a reference input P.
Error signal ER representing the phase difference with HIE□.

is sent to the adder circuit 25 as an addition input, and then the adder circuit 25 adds the error signal ER2 to the error signal ERz supplied from the speed detection circuit 24 and supplies it to the servo amplifier circuit 26. ing.

In the dubbing mode, the recording signal picked up by the recording/reproducing head 35 is converted into a reproduction signal PBvn by the reproduction circuit 36 and supplied to the recording circuit 16 of the electronic still camera l.

In the above configuration, when the recording/reproducing deck 3 enters the recording mode, reproduction mode, or dubbing mode, the drive motor 22 is driven and controlled by the speed servo system SP2 to rotate the magnetic disk 21 at a predetermined reference speed.

In particular, when the recording/reproducing deck 3 enters the recording mode, the switching circuit 2
9 is switched to the signal input terminal a side, the external synchronization signal VD becomes the reference input PHat to the phase comparator circuit 28.
By being supplied as yz, the phase servo system PHO
An error signal ER whose phase is synchronized with the external synchronization signal VD
3, the error signal E_Rt of the speed servo system SP2 is corrected.

The magnetic disk 21 is thus driven to rotate at a predetermined reference speed and at a phase synchronized with the external synchronization signal VD, and a separately supplied recording signal is thus recorded on the magnetic disk 21 via the recording/reproducing head 35.

Next, when the recording/playback deck 3 enters the playback mode, the switching circuit 2
9 is switched to the signal input terminal side, and the reference phase generation circuit 3
A reference phase signal PHRKF2 generated from 0 is supplied as a reference input PH+1trz of the phase comparator circuit 28. Therefore, at this time, the phase servo system PHO
is the reference phase signal PH□.

The magnetic disk 21 is driven to rotate with a phase synchronized with the magnetic disk 21, and thus the recording signal recorded on the magnetic disk 21 can be read by the recording/reproducing head 35.

In addition, when the recording/reproducing deck 3 enters the dubbing mode of the electronic still camera l, the switching circuit 29 switches to the signal input terminal C side and transfers the phase reference signal PH*ty+ supplied from the electronic still camera 1 to the phase comparison circuit. 28 standard input PH
Supplied as □□.

Thus, the phase servo system PHO uses the phase reference signal PH□F
1, the magnetic disk 21
drive the rotation.

On the other hand, in this dubbing mode, the drive motor 4 is rotationally driven by the speed servo system SPI of the electronic still camera 1 at a speed synchronized with the reference speed signal REF of the reference oscillator 11, and the rotational phase of the magnetic disk 2 is detected. 14, and this signal is sent to the recording/reproducing deck 3 as a phase reference signal PH*tr+.

Here, the rotational phase of the magnetic disk 21 of the recording/reproducing deck 3 is
If the rotational phase of the magnetic disk 2 of the electronic still camera 1 is not synchronized, an error signal ER4 representing the phase difference is supplied to the adding circuit 25, thereby correcting the phase of the drive motor 22.

This phase correction is performed at a slow rise speed determined by the rise speed of the phase servo system PHO.

When the rotational phase of the magnetic disk 21 eventually matches the rotational phase of the magnetic disk 2, the drive motor 22 continues to rotate while maintaining this synchronized state by the phase servo system PHO.

In this state, the timing circuit 19 outputs the gate control signal G for a predetermined one track period based on the detection output DP obtained from the rotational phase detector 14 on the magnetic disk 2 side.
By generating ATE, the recording gate circuit 17 is opened, and the recording signal for one frame reproduced from one recording track of the magnetic disk 21 by the recording/reproducing head 35 is transmitted to the reproduction circuit 36 and the recording circuit. 16, the magnetic disk 2 via the recording gate circuit 17 and the recording/reproducing head 18
The recorded data is dubbed onto a determined track by the recording circuit 16 above.

According to the above configuration, although the electronic still camera 1 does not itself have a speed servo system 5 PIL, it can perform dubbing while realizing phase servo operation using the phase servo system PHO of the recording/playback deck 3. I can do it. Therefore, the electronic still camera 1 is in its original imaging operation mode (
In other words, in the operation mode (in which video signals obtained from the camera circuit provided in the electronic still camera 1 are recorded), the magnetic disk 2 is rotationally driven using a speed servo system SPI that has a fast startup speed and is resistant to fluctuations in power supply voltage. Thus, phase servo operation during dubbing can be realized without any loss of its original advantages.

In the above-mentioned embodiment, a dedicated recording/playback deck 3 is provided for the electronic still camera l, and the recorded signal reproduced by the recording/playback deck 3 is dubbed to the electronic still camera l. , electronic still camera 1
The device for dubbing in combination is not limited to this, but in other words, in a playback device that has a speed servo system SP2 and a phase servo system PHO, the electronic still camera 1 uses the electronic still camera 1 as a phase reference signal for the phase servo system PHO of the playback device. If the rotational phase detector 14 of the still camera 1 supplies the rotational phase detection signal DPI representing the rotational phase of the magnetic disk 2 of the electronic still camera 1, the same effect as described above can be obtained.

Effects of the Invention As described above, according to the present invention, the magnetic disk of an electronic still camera is driven by a speed servo system that does not have a phase servo function. An electronic system that can reliably perform phase servo operation using the phase servo system of the player used during dubbing without sacrificing any of the advantages obtained by rotationally driving the magnetic disk using a speed servo system that is resistant to pressure fluctuations. A still camera can be easily realized.

[Brief explanation of drawings]

The drawing is a schematic block diagram showing an embodiment of an electronic still camera according to the present invention. 1...Electronic still camera, 2.21...
・Magnetic disk, 3...Recording/playback deck, 4.22
...... Drive motor, 10.23... Frequency signal generator, 14.27... Rotation phase detector, 17. ... Recording gate circuit, 18...
・Recording head, 35...Recording/reproducing head, SPI,
SP2... Speed servo system, PHO...
Phase servo system.

Claims (1)

[Claims] An electronic still camera in which a magnetic disk is rotated at a predetermined speed by a speed servo system and a video signal is recorded on the magnetic disk. In a dubbing mode in which dubbing is performed on the magnetic disk, rotational phase signal forming means is provided for detecting the rotational phase of the magnetic disk and transmitting the rotational phase detection signal as a phase reference signal to the phase servo system of the reproducing machine. A distinctive electronic still camera.