JPH052751A - Recorder for both side simultaneous reproducing disk - Google Patents

Abstract

PURPOSE:To easily realize the recording of a both side simultaneous reproducing disk whose constitution is simple, and whose efficiency is improved by synchronously driving two recorders, and operating two channel synchronous recording. CONSTITUTION:The first and second reference signals are outputted from first and second variable frequency-dividing means 12 and 13 based on the detection signal of the first irradiated position detecting means 4. The first reference signal is inputted to a first servo means 3 which controls the rotating phase of a first disk motor 1, and a second servo means 23 which controls a second motor 21. And also, the second reference signal is inputted to a third servo means 8 which controls the movement of a first recording head 6, and a fourth servo means 28 which controls a second recording head 26. Then, the rotating phase and irradiation radius of recording beams, of first and second records D1 and D2, are commonly held, and the recording signals of the two channel- divided channels are simultaneously recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for a double-sided simultaneous reproduction disc.

[0002]

2. Description of the Related Art JP-A-61-214244 (G1)
1B7 / 24) discloses a disc record in which disc records having spiral recording tracks formed in opposite directions are attached. Therefore, if you set up pickups on the upper and lower sides of the disc record and play it back,
The recorded signals can be simultaneously reproduced from both sides of the disc record, and the reproduction of the broadband signal becomes easy.

[0003]

However, in the above-described conventional disc record, when the front and back sides are recorded at different timings and pasted together, the disc records are simultaneously recorded due to the rotational fluctuation of the disc record at the time of recording. It is expected that the desired information is recorded with a large deviation in the track direction.
This deviation of the reproduction timing can be eliminated by largely displacing the irradiation position of the reproduction beam in the track direction or electrically changing the delay amount of the reproduction signal. However, it is not desirable to provide such a means because the cost of the reproducing apparatus increases. Therefore, it becomes necessary to prevent the above-mentioned phenomenon by simultaneously recording two discs. However, in order to mount and record two discs on the same rotary shaft, a drastic design change is required for the conventional recording device.

Therefore, the present invention proposes a technique for simultaneously recording two discs by two disc recorders.

[0005]

According to the present invention, a reference signal obtained from a first disc recorder is input as a reference signal of a second disc recorder, and a channel-divided signal is simultaneously supplied to two disc records for recording. It is characterized by doing.

[0006]

Therefore, according to the present invention, since the first disc record of the first disc recorder and the second disc record of the second disc recorder are driven in synchronization, recording can be performed without causing a shift at least in the rotational direction. To be done.

[0007]

The present invention will be described below with reference to the illustrated embodiments. As shown in FIG. 1, this embodiment employs a configuration in which the output of a channel division encoder 14 for band-dividing a high-quality video signal into two channels is recorded in two video disk recorders.

As shown in the figure, in this embodiment, the first disk recorder and the second disk recorder have the same constituent elements. However, the rotation direction of the second disk motor 21 is set opposite to the rotation direction of the first disk motor 1.

Therefore, the structure of the first disk recorder will be described below. The first disc motor 1 for driving the first disc record D1 is provided with a first rotation detecting means 2 for detecting the rotation speed thereof. The obtained rotation detection signal is supplied as a comparison signal of the first servo means 3 provided for disk drive control.

On the other hand, the first head drive motor 7 integrated with the first recording head 6 also has a third head for detecting the rotational speed.
A rotation detecting means 5 is additionally provided, and the first recording head 6 is provided.
It is used as a comparison input of the third servo means 8 for controlling the moving speed of.

The first irradiation position detecting means 4 provided integrally with the first recording head 6 slides on a resistance element formed along the moving path of the first recording head 6. It has a pendulum and generates a position detection signal having a voltage value proportional to the radial position of the first disk record D1.

This position detection signal is supplied to the 1 / X conversion means 10 constituting the first reference signal generation means and converted into a converted output which is inversely proportional to the voltage value. This converted output is a first input which receives the fixed clock generated by the fixed oscillator 11.
Input to the second variable frequency dividing means 12 and 13, respectively.
Each of the variable frequency dividing means 12 and 13 derives a frequency-divided output having a frequency proportional to the converted output as a first reference signal and a second reference signal having different frequencies. The first reference signal is supplied as the reference signal of the first servo means 3, and the second reference signal is supplied as the reference signal of the third servo means 8.

Therefore, the first disk motor 1 is driven at a speed inversely proportional to the radius of the irradiation position of the recording beam, and the first head drive motor 7 is moved at a speed inversely proportional to the radius. Therefore, the first disc record D
1 is driven at a constant linear velocity, and the first recording head 6 moves at a constant pitch.

In the above-mentioned state, the first signal and the second signal are derived from the channel division encoder 14 for inputting the high quality video signal, and the first signal is inputted to the first FM modulating means 9. This FM modulated output is supplied as a recording signal to the first recording head 6 to form a recording pit at the irradiation position on the disk surface.

The above-mentioned first signal and second signal are NTSC.
The color video signal and the horizontal sync signal format are common, and the luminance components of the effective video lines 1038 of the high-definition video signal are distributed and converted line-sequentially. Further, the color components are converted into line-sequential color signals, which are distributed and converted. The luminance component and the color component assigned to each line are time-division multiplexed and converted into signals of one channel. Such conversion by band division is also adopted as a standard of high-definition VCR called UNIHI, and since it is not a special new structure, its detailed description will be omitted.

All the constituent elements of the above description are disclosed in the second disk recorder, and the second disk motor 2
Reference numeral 1 is the first disk motor 1, second rotation detecting means 22 is the first rotation detecting means 2, second servo means 23 is the first servo means 3, and second irradiation position detecting means 24 is the irradiation position detecting means 4. In addition, the third rotation detecting means 25 is the first rotation detecting means 5
The second recording head 26 is used for the first recording head 6, the second head motor 27 is used for the first head motor 7, the fourth servo means 28 is used for the third servo means 8, and the second FM modulating means 29 is used for the first FM modulation. Means 9 and each component in the second reference signal generating means to each component in the first reference signal generating means,
Corresponds to each. In this embodiment, the second reference signal generating means and the second irradiation position detecting means 24 do not function.

The feature of this embodiment is that a second signal is supplied to the second FM modulating means 29, a first reference signal is inputted to the second servo means 23 of a second disk recorder, and a second disk is supplied. The point is to input a second reference signal to the fourth servo means 28 of the recorder.

Therefore, the second servo means 23 inputs the first reference signal common to the first servo means 3,
As long as the first servo means 3 and the second servo means 23 are operating stably, the second disk record D2 is rotationally driven in the same phase as the first disk record D1. Further, the fourth servo means 28 inputs the second reference signal common to the third servo means 8, and as long as the third servo means 8 and the fourth servo means 28 operate stably, the first The recording head 6 and the second recording head 26 are defined at a common radial position. In this state, the first signal and the second signal to be reproduced are simultaneously recorded at the same timing. Therefore, when a double-sided simultaneous reproduction disc in which these two recording discs are aligned and bonded to each other is reproduced from the same position on the front and back sides, signals are simultaneously reproduced without timing deviation in the recording track direction.

In this embodiment, the drive of the head motor is also controlled by the common reference signal. However, if the radial movement of the upper and lower pick-ups can be controlled independently during reproduction, the second reference signal is not always required. Needless to say, the output of the second variable frequency dividing means 33 may be supplied to the fourth servo without being required to be common.

[0020]

As described above, according to the present invention, two recorders are synchronously driven to simultaneously record on two channels, and therefore, it is possible to easily realize a highly accurate double-sided simultaneous reproduction disc recording with a simple structure. Is large.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a recording apparatus according to an embodiment of the invention.

[Explanation of symbols]

 D1 1st disk record D2 2nd disk record 1 1st disk motor 21 2nd disk motor 2 1st rotation detection means 22 2nd rotation detection means 3 1st servo 23 2nd servo 4 (1st) irradiation position detection means 5 Third rotation detecting means 25 Fourth rotation detecting means 6 First recording head 26 Second recording head 7 First head motor 27 Second head motor 8 Third servo 28 Fourth servo

Claims (1)

Claim: What is claimed is: 1. An encoder for dividing video information of 1 channel into video information of 2 channels and deriving it, a first disk motor for driving a first disk, and a second disk. A second disk motor, first rotation detecting means for detecting rotation of the first disk motor, and the second disk motor
Second rotation detecting means for detecting rotation of the disk motor,
A first recording head that is guided in the radial direction of the disk surface so as to face the recording surface that rotates in one direction of the mounted first disk, and a recording that rotates in the other direction of the mounted second disk. A second recording head facing the surface in the radial direction of the disk surface, a first head drive motor for driving the first head in the radial direction of the disk, and driving the second head in the radial direction of the disk. A second head drive motor, third rotation detection means for detecting rotation of the first head drive motor, fourth rotation detection means for detecting rotation of the second head drive motor, and Irradiation position detection means for detecting the beam irradiation position, reference signal generation means for generating a reference signal whose period is proportional to radius information obtained from the irradiation position detection means, the reference signal and the first signal.
A first servo means for phase-comparing the rotation detection output of the rotation detecting means to control the rotation of the first disk motor, and a second disk motor for phase comparing the reference signal and the rotation detection output of the second rotation detecting means. Second servo means for controlling the rotation of the first head drive motor by phase comparing the reference signal with the rotation detection output of the third rotation detecting means, and the reference signal. A double-sided simultaneous reproduction disk recording apparatus comprising: fourth servo means for controlling the rotation of the second head drive motor by phase comparison of the rotation detection outputs of the fourth rotation detection means.