JPS60133557A - Recording system - Google Patents

Abstract

PURPOSE:To record and reproduce signals with high SN and density and to extend the life of a recording electrode by a recording voltage by boosting the recording voltage when frequency is high and dropping the recording voltage in case of low drequency in accordance with the level of the frequncy of an information signal. CONSTITUTION:The 1st insulating film 103 and the 2nd insulating film 104 having a charge accumulating function are successively formed on the surface of a semiconductor layer 102 to form a recording medium. The recording electrode 107 to which the recording pulse voltage corresponding to an information signal to be recorded is applied is relatively moved and the charge corresponding to the information signal is accumulated in the 2nd insulating film 104. The reproducing electrode is relatively moved on the recording medium 101 and the change of electric characteristics of the recording medium to obtain a reproducing signal. The recording pulse voltage 108 is changed on the basis of the frequency of the information signal to be recorded. The recording voltage of a recording electrode stylus is finely controlled on the basis of the frequency of the information signal, so that the life of the electrode stylus is expanded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a recording method for recording information signals in the form of electrostatic charges using a recording medium composed of a semiconductor layer and an insulating film. Background and problems r'a, ] Conventional, IC
Dynamic memory devices other than memory are broadly divided into magnetic disk storage tapes, optical disks,
It is classified as a capacitive disk. The magnetic type has the great advantage of being able to perform recording, reproduction, and erasing easily, but has the disadvantage of low recording density. On the other hand, in optical discs and capacitive discs, an information signal such as a video signal, an audio signal, or a theta signal is recorded in a concave and convex form on a disc-shaped recording medium such as vinyl chloride.

Since it employs an optical or electrostatic angulation method, high-density recording and reproduction is possible, but it has the disadvantage that erasing and re-recording are practically impossible.

Although various rewritable optical discs have been proposed, most of them are still in the experimental stage.

Therefore, the inventors formed a first KbR film, such as a silicon oxide (Si0) film, on a semiconductor layer such as silicon, as a recording/reproducing method that has a high recording density and is capable of re-recording. A recording medium having a structure in which a second insulating film having a charge storage function such as a silicon nitride (813N4) film is further formed is formed on the groove 2, and recording electrodes are arranged on this recording medium. By moving the recording electrode relative to the recording medium while applying a recording pulse voltage corresponding to the binary information signal to be recorded on the electrode, the tunneling effect of the first insulating film is achieved. Signals are recorded by accumulating charges in the second insulating film using A method has already been proposed in which the presence or absence of a depletion layer occurring in a semiconductor layer is detected as a change in capacitance.

By the way, in this method, when recording on a recording medium by applying the full recording pulse voltage to the recording 1F pole, the 11+ raw output decreases as the frequency of the recording signal increases with the same valve voltage.

In other words, the amount of charge trapped on the recording medium (fT raw output) is related to the time during which the recording electrode is applied to a certain point on the recording medium and the recording voltage.

However, the width of the recording electrode in the wavelength direction is made thinner in order to increase the recording density. In order to improve the recording/reproducing frequency characteristics, the recording voltage must be increased to a certain extent, but as a matter of course, increasing the recording voltage shortens the life of the recording electrode, which is a problem.

In order to increase the recording density, the recording voltage is set to optimally record when the frequency of the information signal is high. When the frequency of the information signal is low, a voltage exceeding the optimal recording voltage is used for a long period of time. Since the voltage is applied to the recording electrode, the life of the recording electrode is shortened, and conversely, if the recording voltage is set to optimally record when the frequency of the information signal is low, there is a problem that high-density recording is no longer possible.

[Purpose of the invention]

The purpose of this invention is to provide a recording method that makes it possible to record information signals with high density and over a long life using a recording medium using a semiconductor. Invention 1-t, a recording medium formed by sequentially forming a first insulating film and a second insulating film having a charge storage function on a semiconductor layer, and moving relatively thereon; t(
Recording is performed by applying the 2-pulse IE pressure described above to the information signal to be recorded via T, ', and I, and accumulating a charge corresponding to the information signal in the insulating film with r'> 2. J, %i 'FF 1 The recording pulse voltage is roughened depending on the recording frequency.

In other words, the recording characteristic is that at the same recording voltage, as the family 1 inverse number increases, the tJr raw output id il'? Little 1. S
Since the N ratio deteriorates, the frequency may vary depending on the frequency of the information 1'14 signal. By increasing the recording voltage when the frequency is low and lowering the recording pressure when the frequency is low, it is possible to record and reproduce at high density with a good signal-to-noise ratio, and the recording electrode is also long and thin. The recording voltage is controlled.

[ZuC light hook “14-] According to this invention, the information signal can be transmitted with high density and the S/N ratio is also good.
It is possible to record a record 11f, and it is also advantageous in terms of being able to make a record of power.

[Embodiments of the invention]

1st f:g+ is a schematic configuration diagram in one embodiment of the present invention. In the figure, the recording medium (101) is half 2! The body layer (102), for example, an N-type silicon single crystal substrate, is coated with a silicon oxide (Si0) film of 2π1 (dural layer 1032, for example, 20A, 8 degrees Celsius).
The insulating film (1,04) of 21 l2 is formed with a total charge accumulation state of 4 in SiN'J with a thickness of about A and a thickness of λ; Tun layer (1'O
5) is applied as necessary.

Then, on this t1d recording medium (1011), the signal d
The recording electrode needle (106) covered with the recording electrode (107) for performing α recording is brought into contact with the recording medium (107) while applying the high voltage pulse signal (108) supplied from the recording circuit (O9). 101), 13
Let's record the issue.

Figure 2 shows the recording circuit (109) in the schematic configuration diagram of Figure 1.
It is a simple circuit block diagram of the -119 example and video [Squid record example it].

A video signal input from the INFO'J' terminal is once amplified by a video amplifier (201). The amplified video signal is sent to a recording circuit (place) and an FM modulator (202).
supplied to The video signal fed to the FM modulator (202) is FM modulated, e.g. with a frequency deviation of 4.8M1
ff, ~5Lil (converted to Z FM modulated wave.

Thereafter, the FM modulated wave is converted to a converter circuit (203) in order to drive the recording pulse output transistor (207) of the recording circuit (1i9.).
It is converted into a digital signal (2) and input to the recording pulse output transistor (2O7).

On the other hand, the video signal supplied to the recording circuit (D'') has its DC component reproduced by the clamp diode (204).
The inverting amplification transistor (205) can invert the polarity. The inverted video signal is expressed as “Main source voltage jj;
Applied to the base of group 1 transistor (20t3), electrolytic corrosion? The voltage control transistor 111 (206) controls the voltage A corresponding to the potential of the video signal for one period. '11L pressure A is supplied to the recording pulse output transistor (2 (17'). As mentioned above, the recording pulse output transistor (207)
Since the FM modulated wave converted to a digital signal is input to the base, a recording pulse corresponding to this signal is output, and its amplitude (is
), the voltage A is controlled according to the potential of the video signal. The recording pulse output transistor (207) changes the pulse to output amplitude! I did it (' M
The odd M'31 skin is 0 (output from JTPU'l' and the first
The record shown in the figure is applied to the record 'Ichigoku Kugi° (' River).

As an example of the actual performance of the present invention, the 41r recording method has been conventionally used for recording and reproducing video signals on various recording media. It's clear. This method is a method in which the frequency is changed by the potential of the video signal (well-known). , sieve 311 go (
For example, the white peak portion) is a modulation method that increases the carrier frequency. Therefore, in order to generate a pulse whose output voltage changes according to the frequency of the Ii' M modulated wave corresponding to the video signal to be recorded, it is necessary to supply it to the recording pulse output transistor (207) that outputs the recording pulse. The voltage A (ill) that determines the amplitude voltage of the recording pulse can be controlled by the Ql video signal by the m11 transistor (2 (H3)) on the power supply.
11 fjll l transistor (206) is PNP
The synchronous negative video signal, which is normally used in 1b type transistor, is inverted by the video intensifier 1Vii (201).
E pressure! li' is input to the base of the control transistor (206), so it is input to the FM modulator (202);ii
4 laps? Since the horizontal/vertical synchronizing signal part with a low frequency has the base NT and the digit is one hit,'(LIE, A kt
The recording pulse output transistor (20?) becomes low and the recording pulse is rejected by the recording pulse output transistor (20?) corresponding to the heavy pressure A.

′:j-ta]rr'3 to 1・”%Ichangei1.!] device (
202) Changed to 3+4 '+': Frequency g'i's current peak signal 'rj part t; 1-Base level has decreased, so voltage A becomes 7H', 5 <, recording pulse output transistor The amplitude of the recording pulse output from (207) becomes All corresponding to the voltage A.

I-J: iiR, Akashi/Thus, according to the present invention,
High-density recording with a good S/N ratio is achieved from the recording medium.The recording voltage, which determines the life of the recording electrode needle, is controlled to a minute aV++ by the frequency of the information signal. Therefore, the life of the recording machine needle is extended. And I
Since the heat generation of the recording pulse output transistor is suppressed due to '-j+shuttle', the circuit becomes stable and there is also an effect in saving power to some extent.

[Brief explanation of the drawing]

The eleventh problem is the outline h:'t in one embodiment of the present invention ψ
1r father diagram, FIG. 2 is a diagram showing an example of the configuration of the circuit shown in FIG.
3-First absolute r & I! Momme, 104 second monochromatic membrane,
105 conductive layer, 106-K: gold k'FFi
, MVg 1°, 1 0 7 ≦e&'#? i5 pole, 108 recording pulse voltage signal

Claims (1)

[Claims] A recording medium in which a first insulating film and a second insulating film having a charge storage function are sequentially formed on a semiconductor layer, and a recording pulse voltage corresponding to an information signal to be recorded. is applied to the recording electrode, and the electric charge corresponding to the information signal is generated by moving the recording electrodes to which the information signal is applied. A recording means for recording the information signal by accumulating it on an insulating film of ζ2, and a reproducing electrode that is moved relatively over the recording medium to detect a change in the electrical characteristics of the recording medium through the reproducing electrode. 1. A recording/reproducing system comprising a reproducing means for obtaining a reproducing signal by means of a reproducing means, characterized in that the total recording voltage of the recording pulse voltage is changed depending on the frequency of the information signal to be recorded.