JPS60219656A - Recording and reproducing system of information signal - Google Patents

Abstract

PURPOSE:To realize simultaneous monitor by providing the 1st recording and reproducing means for recording and reproducing signals with a signal scanning element and the 2nd recording and reproducing means for performing recording/ reproduction with optical spot from a face opposite to the recording medium face. CONSTITUTION:The information signal is recorded and reproduced for an information recording medium D with the signal scanning element S provided with the electrode 9. Then the recording and reproduction are executed by using an electromagnetic wave from a face opposite to the recording medium face of the information recording medium D to which the electrode terminal of the electrode 9 of the signal scanning element S comes close. A recording and reproducing section PH records and reproduces the information signal by using the minute spot of the laser light or the minute spot of other energy for example. Thus, the simultaneous monitor is executed while performing high density recording and reproduction and the recording/reproduction is executed easily under the tracking control.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for high-density recording and reproduction using a rewritable information recording medium capable of high-density recording and reproduction. The present invention also relates to current recording/reproducing methods, particularly information signal recording/reproducing methods that allow simultaneous monitoring during recording of information signals.

(Prior Art) In recent years, as the demand for high-density recording and reproduction has increased in various technical fields, attempts have been made to achieve high-density recording and reproduction using various types of recording media. As a material (for example, To
, Ox) is provided on the substrate, and
A minute spot of laser light whose intensity is modulated by an information signal is projected through the substrate onto the recording layer of a recording medium having a thick layer of a material transparent to light on the upper surface of the recording layer. , an information signal is recorded on the recording layer of the recording medium by causing a phase change in the recording layer of the recording medium according to the information signal by the heat of the laser beam described above; A spot of a laser beam of a certain intensity is applied to the recording M in which an information signal is recorded due to a phase change, and the information signal recorded as a phase change on the recording layer of the recording medium is An optical recording and reproducing method for information signals, which reproduces the information by photoelectrically converting light reflected from the surface of the recording layer, is attracting attention partly because it has the possibility of being rewritten.

(Problem that lt1 Ming is trying to solve) Then, with the above-mentioned optical recording and reproducing method of information signals, there is a problem that it is difficult to realize simultaneous monitoring when recording information signals, and a solution has been sought. Ta.

(Means for Solving the Problems) The present invention prevents phase change from an amorphous state to a crystalline state, or from a crystalline state to an amorphous state, by application of electromagnetic waves or electric fields, heating, etc. 5. A method for recording and reproducing information signals on an information recording medium comprising at least a recording layer made of a material such as During reproduction, an information signal is recorded on an information recording medium and an information signal is reproduced from the information recording medium by a signal scanner equipped with an electrode whose electrode end is used close to the surface of the recording medium. 1st. A recording/reproducing means, and a minute light spot or other light spot separated from the surface opposite to the recording medium surface to which the end of the electrode in the signal scanner in the first recording/reproducing means is in close proximity. a second recording/reproducing means for recording an information signal on the information recording medium and reproducing the information signal from the information recording medium using a minute spot of energy; When an information signal is being recorded on a recording medium, the information signal recorded on the information recording medium by the first recording and reproducing means is immediately transferred from the information recording medium by the second recording and reproducing means. Play and also
When the recording operation of the information signal on the information recording medium is performed by the above-mentioned second recording/reproducing means,
i An information signal recording and reproducing method in which an information signal recorded on an information recording medium by the above-mentioned second recording and reproducing means is immediately reproduced from the information recording medium by the above-described first recording and reproducing means, and an information signal recording and reproducing method that uses electromagnetic waves and At least a recording layer made of a material that causes a phase change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state by application of an electric field, heating, etc.; ,
A method for recording and reproducing information signals on an information recording medium on which a tracking reference signal is recorded in advance, wherein when recording an information signal on the information recording medium or reproducing an information signal from the information recording medium, the recording medium The reproduction of the information signal from the information recording medium, such as ia#-, of the information signal to the information recording medium is performed under tracking control by a signal scanner equipped with an electrode whose electrode end is used close to the surface. A first recording/reproducing means such as the one described above and a signal scanner of the first recording/reproducing means described above, in which the ends of the electrodes of the signal scanner are separated from the surface opposite to the surface of the recording medium to which they are adjacent, emit a minute amount of light. a second recording/reproducing means for recording an information signal on the information recording medium and reproducing the information signal from the information recording medium using a spot or a minute spot using other energy under tracking control; When the recording operation of the information signal on the information recording medium is performed under tracking control by the first recording/reproducing means described above,
The information signal recorded on the information recording medium by the recording/reproducing means is immediately reproduced from the information recording medium under tracking control by the aforementioned second recording/reproducing means; When the information signal is recorded on the information recording medium by the means, the information signal recorded on the information recording medium by the second recording and reproducing means is tracked by the first recording and reproducing means. The present invention provides a recording and reproducing method for information signals that can be immediately reproduced from an information recording medium under the following conditions.

(Example) Hereinafter, specific contents of the information signal recording and reproducing method of the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the information signal recording and reproducing method of the present invention. In FIG. 1, D is an information recording medium, and in the following description, this information recording medium It is described as being a disc-shaped information recording medium.

In the information signal recording and reproducing method of the present invention, the information recording medium used for recording and reproducing information signals undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state by application of electromagnetic waves or electric fields, heating, etc. It is like having a recording layer made of a material that undergoes a phase change to an amorphous state.

2 to 7 are longitudinal sectional side views of various configuration examples of an information recording medium used in the information signal recording/reproducing method of the present invention. In FIGS. 2 to 7, l represents a substrate, and this substrate 1 is made of a resin material such as acrylic resin, polycarbonate resin, or vinyl chloride resin, and is transparent to light.

Further, 2 is a recording layer, and this recording layer 2 undergoes a phase change from an amorphous state to a crystalline state, or a phase change from a crystalline state to an amorphous state, due to the application of electromagnetic waves or electric fields, heating, etc. A layer having a predetermined thickness, for example, 1000 angstroms to 1500 angstroms, is formed using a material such as TeOx, Go, or Sn, by a film forming method such as a vapor deposition method or a sputtering method.

3 is 1/2 of the shortest recording wavelength recorded on the information recording medium
The dielectric layer 3 has the following thickness, and this dielectric layer 3 can be formed of a resin such as styrene by a spinner method or a sputtering method.

4 is a thin layer made of a conductive material (hereinafter sometimes referred to as conductor layer 4), and this layer is configured to be transparent to light.

The conductor layer 4 described above has a sheet resistance of 50Ω.
/♂〜100Ω/cd! It may have a thickness of about 100%.

Reference numeral 5 denotes a dielectric layer made of a material suitable for dielectric heating in accordance with the information signal when recording the information signal, and examples of the material for forming the dielectric layer 5 include barum titanate. The thickness of this dielectric layer 5 is, for example, approximately several hundred angstroms (for example, 500 angstroms).

In addition, 6 is a material that undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state by applying electromagnetic waves, electric fields, heating, etc., such as TeO
x, Ge, Sn, and a material suitable to be dielectrically heated in response to the information signal during the recording of the information signal, such as palium titanate, for example in a thickness of 1000 angstroms to 1500 angstroms. 7 is a recording layer configured as a substrate having a conductive property.

In the information recording medium shown in FIGS. 2 to 7, the above-mentioned substrate 1 in the recording medium and the substrate 7, which itself is configured to have conductivity, have a flat surface. In some cases, it is configured as a state in which the pits are arranged by the tracking reference signal on the surface, and in some cases it is structured as the state in which the pits are arranged by the tracking reference signal on the surface. In the case of an information recording medium constructed using a substrate of □, recording and reproducing operations of information signals on the information recording medium can be performed under tracking control.

To form pits using a tracking reference signal on the surface of the substrate 1 or 7, for example, a technique for forming sound grooves in a disc record may be used.

This can be easily carried out using a well-known technique for forming pits in a video disc, that is, a technique of transferring a predetermined pattern to a resin material using a standber.

8 and 9 show pits Py formed on the surface of the substrate 1 or the surface of the substrate 7 by the tracking reference signal.
Fig. 10 is a partially enlarged plan view of an example of each pattern of Pe..., and Fig. 10 is a case where pits PyP...p... are formed at the bottom of the groove by a tracking reference signal. Partially enlarged plan view ((a) of Figure 1O)
and a partially enlarged longitudinal cross-sectional view ((b) and (e) of FIG. 10).

The pattern of pits Pe Py P... based on the tracking reference signal shown in FIG. 8 is formed by recording traces tl, t2, . This is a pattern where pits P* Pe P... are continuously recorded and formed on both sides of the tracking reference signal by the tracking reference signal, and the tracking reference signal shown in FIG. The pattern of Pireto P* Pt... is based on the tracking reference signal number g on both sides of each recording trace tl, t2... where the information signal to be recorded and reproduced on the information recording medium is to be recorded and reproduced. This is a pattern in which pits PyP... are recorded and formed intermittently.

When the information signal to be recorded and reproduced on the information recording medium is a television video signal, the above-mentioned No. 9
By adopting the pattern of pits Py Py P... caused by the tracking reference signal as shown in the figure, the pits Ps Ps P... caused by the tracking reference signal correspond to the horizontal blanking period in the television video signal. By using an intermittent recording mode in which the tracking reference signal exists only during the specified period, the presence of the tracking reference signal will not cause any interference to the television video signal recorded on the information recording medium. It can be done.

By the way, as mentioned above, the pits Pt Pe P...- due to the tracking reference signal are located on both sides of the recording trace of the information signal to be recorded and reproduced on the information recording medium, as shown in FIG. When records are formed intermittently as shown in the diagram, unrecorded areas (t g, t g, However, using the above-mentioned non-recording area for recording and reproducing other information signals is due to the recording density of the information recording medium. It is also beneficial from the perspective of improving

Next, in (a) to (c) of FIG. 10, G, G.

G... is a groove with a depth of d formed in the substrate 1 (or 7), and at the bottom of the grooves G, G, G... are pits P* Pt... based on the tracking reference signal. is formed. The depth d of the grooves G, G, G, etc. described above is selected to be shorter than the recording wavelength of the pit PDP by the tracking reference signal to be recorded in the groove G, so that playback is possible. Even if the information signal is reproduced from the information recording medium during operation by detecting a change in capacitance value, the tracking reference signal can be reproduced satisfactorily.

T, T, T, . . . in the figure are portions where recording traces of information signals to be recorded and reproduced are to be formed on the information recording medium. 10(b) is a longitudinal cross-sectional side view taken along line bb in the plan view shown in FIG. 9(a), and FIG. It is a longitudinal side view taken along line cc in the plan view shown in (a).

Even when grooves G, G,... are provided in the information recording medium, and pits PsP... are formed in the grooves G by the tracking reference signal, the pits PyP... are formed by the tracking reference signal. , may be continuous, as in the pattern shown in FIG. 8, or intermittent, as in the pattern shown in FIG.

Figure 2 shows materials 1, such as T
1 is a longitudinal sectional side view of an information recording medium constructed by depositing a thin layer of materials such as O, Ge, and Sn on a substrate 1 as a recording layer 2 by applying a vapor deposition method or a sputtering method.

As mentioned above, a material that undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state by applying electromagnetic waves, electric fields, heating, etc., is produced by vapor deposition,
Alternatively, the recording layer 2 deposited and formed on the substrate 1 by sputtering is formed by bringing its constituent materials to a temperature above the melting point and then rapidly cooling them, so that the entire surface of the recording layer 2 is amorphous. is in a state of

When recording information signals on the recording layer 2 whose entire surface is in an amorphous state as described above, minute spot-like portions of the recording layer 2 are The information signal is transferred to the recording layer 2 by heating the material to a temperature above the softening point or melting point, and then slowly cooling that part so that the minute spot-like part becomes crystallized. However, it is also possible to record it in

The entire surface of the recording layer 2 is made into a crystalline state in advance, and during recording, minute spot-like portions of the recording layer 2 are heated to a temperature higher than the melting point of the constituent material of the recording layer 2, and then rapidly cooled. It is easier to perform recording by making the minute spot-like portions into an amorphous state, so it is easier to perform recording methods such as applying electromagnetic waves or electric fields, heating, etc. A material that causes a phase change from an amorphous state to a crystalline state or a phase change from a crystalline state to an amorphous state is applied to the substrate 1 as a thin layer by applying a vapor deposition method or a sputtering method. After being deposited, the entire surface of the thin layer is irradiated with light using, for example, a flash lamp to bring the constituent material of the thin layer to a temperature higher than the softening point or melting point of the material, and then slowly cooled to form a layer on the substrate 1. The recording layer 2 whose entire surface is crystallized is formed, and minute spot-like portions of the recording layer 2 are formed in the recording layer 2 whose entire surface is crystalline as described above. It is better to record the information signal by heating the material of the recording layer 2 to a temperature equal to or higher than the softening point or melting point, and then rapidly cooling that part (see Figures 3 and 3). The same applies to the information recording medium shown in FIG. 7).

Next, in the information recording medium shown in FIG. 3, the recording layer 2 of the information recording medium shown in FIG. A dielectric layer 3 having a thickness of 1/2 or less of the shortest recording wavelength is provided on the upper surface of the recording layer 2 made of a material that causes a phase change to a crystalline state or a phase change from a crystalline state to an amorphous state. It is something that The dielectric layer 3, as described above, is made of a thin film of resin such as styrene, for example.

The information recording medium shown in FIG. 3 has a recording layer 2.
Since the extremely thin dielectric layer 3 is formed on the top surface, the recording operation and the reproducing operation based on capacitance detection can be performed stably and reliably compared to the information recording medium described in the second diagram. It helps to make things happen.

The information recording medium shown in FIG.
In the recording layer 2 of the illustrated information recording medium, a phase change occurs from an amorphous state to a crystalline state, or from a crystalline state to an amorphous state, due to the application of electromagnetic waves or electric fields, heating, etc. A recording layer 2 and a substrate 1 made of materials such as
The information recording medium shown in FIG. 4 has a conductor layer 4 between the The reproducing operation based on the detection can be performed stably and reliably.

The information recording medium shown in FIG.
A dielectric layer 5 made of a dielectric material such as pallium titanate is formed on the top surface of the dielectric layer 5. Next, the top surface of the dielectric layer 5 is made amorphous by applying electromagnetic waves or an electric field, heating, etc. A recording layer 2 made of a material that causes a phase change from a crystalline state to a crystalline state or a phase change from a crystalline state to an amorphous state is deposited, and further, a recording layer 2 is formed on the upper surface of the recording layer 2 at the shortest distance. A dielectric layer 3 having a thickness of 1/2 or less of the recording wavelength is provided.

In the information recording medium having the configuration shown in FIG.
For example, a dielectric layer 5 made of a material such as pallium titanate that has a large dielectric constant and generates a large dielectric loss when a high frequency electric field is applied is provided adjacent to the recording layer 2. Therefore, the information signal can be easily recorded on the recording layer 2 by the heat generated in the dielectric layer 5 by the recording signal when recording the information signal.

Next, the information recording medium shown in FIG. 6 corresponds to a configuration in which the dielectric layer 5 and the recording layer 2 are combined into one layer 6 in the information recording medium explained with reference to FIG. . That is, the layer 6 in the information recording medium shown in FIG.
A recording layer made of a mixture of a dielectric material and a material that undergoes a phase change from an amorphous state to a crystalline state, or a phase change from a crystalline state to an amorphous state, due to the application of electromagnetic waves, electric fields, heating, etc. 6, the information recording medium shown in FIG. 6 undergoes a phase change from an amorphous state to a crystalline state due to the application of electromagnetic waves or electric fields, heating, etc.
For materials in the recording layer 6 where a phase change from a crystalline state to an amorphous state occurs.

Since the heat generated by the dielectric material such as barum titanate present in the recording layer is applied without loss, efficient recording can be achieved with the information recording medium shown in FIG. can.

Next, the information recording medium shown in FIG.
The upper surface of the substrate 7 undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state by applying electromagnetic waves or electric fields, heating, etc. A recording layer 6 is provided which is made of a mixture of an amorphous material that undergoes a phase change to a state and a dielectric material □.

In the information recording medium shown in FIG. 7, the conductive layer 5 that was required in the information recording medium described with reference to FIG. It becomes possible to apply methods such as a method for detecting changes in electrical resistance and a method for detecting changes in electrical resistance.

In the information signal recording and reproducing apparatus of the present invention shown in FIG.
The information recording medium is fixed by a fixing member 16 to a turntable 15 fixed to a rotation shaft 14 of a drive motor 13, and is rotated at a high speed at a predetermined number of rotations.

S is a signal scanning element (recording element, recording/reproducing element...recording needle, reproduction needle, recording/reproducing needle), which is, for example, the 11th
The configuration is as shown in the figure. The recording element S illustrated in FIG. 11 has a sliding contact surface 8 that comes into sliding contact with the upper surface of the recording medium in the information recording medium, and an electrode 9 that is made of an extremely thin conductive layer of, for example, 2000 angstroms. It is configured by being provided in the scanner main body 10.

The electrode 9 described above has an electrode width of, for example, about 1 micrometer. In FIG. 11, 11 is a cantilever, and 12 is a connection line used to provide information signals to the electrode 9. In FIG.

When reproducing information signals from an information recording medium is carried out in accordance with the difference in conductivity between an amorphous portion and a crystalline portion of the recording layer of the information recording medium, the above-mentioned The recording element S having such a configuration can also be used as a reproducing element, and in such a case, the recording element S described above is used as a recording/reproducing element.

Now, when high-frequency power whose intensity is modulated by an information signal is supplied to the electrode 9 of the recording element S shown in FIG. 1 via the connection line 12, the recording layer of the information recording medium In response to the above-mentioned high-frequency electric field, an amorphous state portion and a crystalline portion are generated in the recording layer that is strong due to the information signal, and the information signal is recorded.

Furthermore, in order to reproduce the information signal from the information recording medium on which the information signal has been recorded by the signal scanner S as described above, a reproducing element (11 A recording element having the configuration as shown in the figure and a reproducing element having the same configuration may be used. Then, the signal detection circuit detects the information signal recorded on the recording layer of the information-recording medium, thereby making it possible to reproduce the information.

When the information signal from the information recording medium is reproduced by the signal scanner S equipped with electrodes,
A signal detection circuit that detects an information signal based on the difference in electrical conductivity between an amorphous portion and a crystalline portion of a recording layer of an information recording medium includes:
For example, a detection circuit that detects a signal by detecting the difference in electrical resistance between an amorphous portion and a crystalline portion of a recording layer of an information recording medium, or A detection circuit or the like can be used that detects a signal by detecting a difference in capacitance between an amorphous portion and a crystalline portion of the recording layer.

As mentioned above, in order to detect the difference in capacitance between the amorphous state portion and the crystalline portion of the recording layer of an information recording medium, a capacitance change detection type video camera is used. A signal detection circuit with the same configuration as the signal detection circuit used when reproducing information signals from a disk, that is, the electrostatic capacitance between the electrode of the reproduction needle and the recording layer of the information recording medium, is used in the tank circuit of the ultra high frequency oscillator. A well-known structure is used in which the information recording medium is connected to a coupled semi-coaxial resonator, and a reproduced signal corresponding to the recorded information content in the recording layer of the information recording medium is obtained as a change in current. can.

The pit P of the tracking reference signal is recorded on the information recording medium in advance.
yP... is formed, the recording element S (signal scanning element S) is integrally driven and displaced by the actuator ACT of the tracking control system, and the recording element S records information under tracking control. Recording operations while correctly following the record traces on the recording medium (same for S life and funeral)
It becomes easier to get them to do this.

By the way, in the information signal recording and reproducing method of the present invention, a phase change from an amorphous state to a crystalline state or a phase change from a crystalline state to an amorphous state is caused by application of electromagnetic waves or electric fields, heating, etc. Recording of an information signal on an information recording medium comprising at least a recording layer made of a material such as that described above, and reproduction of an information signal from the above-mentioned information recording medium are carried out using the electrode 9 as described above. From the side opposite to the recording medium surface of the information recording medium, which is configured to be scanned by the signal scanner S and the electrode end of the electrode 9 in the signal scanner S is brought close to, The recording and reproducing unit PH is configured to perform recording and reproducing using electromagnetic waves.1 The recording and reproducing unit PH is configured to perform recording and reproducing of information signals using, for example, a minute spot of laser light or a minute spot of other energy. -ing

In the embodiment shown in the first figure, the signal scanner S
Information signals are recorded and reproduced using electromagnetic waves from the surface of the information recording medium opposite to the recording medium surface to which the electrode end of the electrode 9 is brought close. Recording and reproduction are shown as being performed using a minute spot of laser light.

In FIG. 1, the signal scanning element S (recording element, reproducing element) described above is an actuator CT used for driving and displacing the signal scanning element S for tracking control.
and the actuator ACT
is attached to the transport body 21 in the transport mechanism F, so that the signal scanner S is moved in the radial direction of the information recording medium as the transport body 21 moves.

In the illustrated example, the transfer mechanism F is a transfer body that includes a feed screw 23 that is driven and rotated by a transfer motor 22, a screw hole that meshes with the feed screw 23, and a hole that loosely fits into a guide groove 24. 21, however, it goes without saying that other configurations of the transfer mechanism F may be employed when implementing the present invention.

The transport body 21 in the transport mechanism F described above is also equipped with a recording and reproducing section I that performs recording and reproducing using electromagnetic waves. The recording/reproducing unit PH, which is configured to perform this, is simultaneously moved in the radial direction of the information recording medium as the transporting body 21 moves.

In the configuration example shown in FIG. 1, the recording and reproducing section P is configured to perform recording and reproducing using electromagnetic waves.
As mentioned above, H is configured to perform recording and reproduction using a laser beam, and in FIG. 1, 25 is a laser light source, and in the illustrated example, the laser light source is The laser beam emitted from 25 is intensity-modulated by the recording signal when the device is in the recording mode, and is in a state where the intensity is modulated by the recording signal when the device is in the playback mode.

Laser light is emitted from the laser light source 25 with a constant light intensity that is weaker than the intensity of the laser light emitted from the laser light source 25 during the recording mode.

The laser beam emitted from the laser light source 25 described above is 1. Lens 26 → Prism 27 → Polarizing prism 2
8→1/4 wavelength plate 29→reflector 30→objective lens 30, from the back side of the recording layer through the substrate of the information recording medium, to the vicinity of the part where the tip of the electrode 9 of the signal scanner S is located. When the device is in the recording mode, the laser beam emitted from the laser light source 25 is used to collect a small amount of light, whose intensity is modulated by the information signal to be recorded as described above. The information signal is recorded by heating the recording layer with a spot to generate an amorphous state portion and a crystalline state portion in the recording layer of the information recording medium in correspondence with the information signal. ,
Furthermore, when the apparatus is in the reproduction mode, a minute spot of a laser beam of constant light intensity emitted from the laser light source 25 as described above is projected onto the recording layer of the information recording medium, and the reflected light is Objective lens 31 → Reflector 30
→ 1/4 wavelength plate 29 → By being supplied to the signal detection circuit 32 via the polarizing prism 28, the reproduction signal corresponding to the information signal recorded on the information recording medium and the detection of the tracking reference signal are detected. This is done in the signal detection circuit 32. The tracking reference signal detected as described above is converted into a tracking control signal in the tracking control drive circuit 33, and the reflecting mirror 30 is driven and controlled using the tracking control signal, thereby performing a tracking control operation.

Tracking control for the laser beam may be performed by using a tracking control method arbitrarily selected from among various well-known tracking control methods in the optical recording/reproducing method, or by using the signal scanner S described above. A tracking control method such as that described later that is applied during recording and reproducing operations may be adopted, but in any case, tracking control is based on the control of the laser beam projected onto the recording layer of the information recording medium. A tracking reference signal is extracted from the reflected light to create a tracking control signal, and the tracking control signal drives and controls the reflecting mirror 30 to perform tracking control.

In FIG. 1, reference numeral 17 is an input terminal for the main information signal (for example, a color television video signal) to be recorded and reproduced. The main information signal supplied to the terminal 17 is converted into a modulated signal by a modulator (for example, an FM modulator) NOD, is amplified by a recording 1 amplifier RA, and is supplied to an adder DD.

The adder ADD combines the output signal from the recording amplifier RA described above and the signal supplied to the terminal 19 (for example, a signal representing the rotational phase of the information recording medium...in the following explanation, the signal fP3 with one frequency f3 is used). ) is added, and the recording/reproduction selector switch 5Wrpl is added.

It is given as a recording signal to the fixed contact R of 5Wrp2.

In the information signal recording and reproducing method of the present invention, recording and reproducing operations are performed using the signal scanner S (recording and reproducing operations by the first recording and reproducing means), and recording and reproducing operations are performed using electromagnetic waves. The recording and reproducing operation performed by the recording and reproducing unit PH (recording and reproducing operation by the second recording and reproducing means) means that when one recording and reproducing means is operating in the recording mode, the recording and reproducing operation performed by the other recording and reproducing means is operated in the playback mode, thereby enabling simultaneous monitor playback during recording.

The recording/reproducing state of the device shown in the 1st rM is
This is when the second recording and reproducing means is in the recording mode and the second recording and reproducing means is in the reproducing mode, and in this state, the movable contact V of the recording and reproducing switch 5Wrpl is switched by the switching control signal supplied to the terminal 20e. Fixed contact R
The recording signal is switched to the signal scanning element (recording element) S.
is supplied to the recording medium and recorded on the recording medium. In the above state, the switches S W r # S W p are in such a state that the switch SWr is turned off and the switch SWp is turned on by the switching control signal applied to the terminal 20r thereof.

No recording signal is supplied to the laser light source 25.

Further, the recording/reproducing switch 5Wrp2 has its movable contact V switched to the fixed contact P side by a switching control signal supplied to the terminal 20p, and recording/reproducing is performed using electromagnetic waves. The reproduced signal from the section PH is applied to the switch SWp in the on state → the preamplifier PA■ → the demodulator DHH, and the signal demodulated by the demodulator DEN is output to the output terminal 18.

Contrary to the above case, when the first recording/reproducing means is set to the reproducing mode and the second recording/reproducing means is set to the recording mode, the movable contact V of the recording/reproducing switch 5Wrp1 is supplied to the terminal 20e. The fixed contact P is
The reproduction signal from the signal scanner S (reproduction element) is switched to the preamplifier PA+.

→The signal given to the demodulator DHH and demodulated by the demodulator DEEM is outputted to the output terminal 18, and the recording/reproduction switch 5Wrp2 has its movable contact V fixed by the switching control signal supplied to the terminal 20p. Since the switch SWr is turned on and the switch SWp is turned off by the switching control signal supplied to the terminal 20r, the recording signal is transferred from the fixed contact R of the recording/reproduction changeover switch 5Wrp2 to the movable contact V → on. The switch SW is brought into the state of
A laser light source 25 in the recording and reproducing section PH, which is configured to perform recording and reproducing using electromagnetic waves via r.
By being supplied with the information, the recording/reproducing unit PH, which is configured to perform recording/reproducing using electromagnetic waves, performs a recording operation on the information recording medium.

Next, record traces tl, t2, for each round of the information recording medium,
t3... (FIGS. 8 and 9), each signal is composed of a pit array based on a predetermined tracking reference signal whose frequency is selected to occupy a frequency band different from that of the main information signal. A recording/reproducing operation performed by the signal scanner S using an information recording medium on which a recording trace has been previously recorded will be explained.

In the following explanation, the information recording medium is referred to as its record t.
l, t3. ...For t(2n+1), the frequency is f
A tracking reference signal fpl of t2.l is recorded, and a recording trace t2. t4. ...For t(2n),
It is assumed that a tracking reference signal fp2 having a frequency of f2 is recorded.

In the state where the signal scanner S is tracing the recording trace for the main information signal on the information recording medium to record the main information signal,
Two mutually different tracking reference signals f pi, f are obtained from the recording traces for the tracking reference signal of the information recording medium existing on both sides of the recording trace for the main information signal described above.
p2 is read and applied to the preamplifier pap.

The preamplifier PAp is equipped with the signal detection circuit described above, and the output signal from the preamplifier PAp is passed through the bandpass filters BPFI, BPF2 . Given to BPF3. The bandpass filter BPFI extracts the signal fP1, the bandpass filter BPF2 extracts the signal fp2, and the bandpass filter BPF2 extracts the signal fp2.
PF3 extracts a signal fP3.

Signal f P extracted by bandpass filters BPFI and BPF2
i.

fp2 is given to the signal polarity switching circuit SwC, and
The signal fp3 extracted by the bandpass filter BPF3 is given to a switching pulse generator FF (flip-flop FF) via a detector Det3.

Ninth, the signal polarity switching circuit SWC receives a signal from the switching pulse generation circuit FF at a specific rotational phase in the information recording medium (when the tracking reference signal switches from fpl to fP2 or from fp2 to fpl). The switching operation is performed by the switching pulse.

The output signal from the signal polarity switching circuit SC- is rectified and smoothed by a wave detector, etl, and Det2, and then sent to a differential amplifier D.
given to A. The output signal of the differential amplifier OA mentioned above is converted into a tracking control signal in the servo circuit SC and is supplied to the actuator ACT of the tracking control system.

The actuator ACT of the tracking control system drives and displaces the signal scanner S, so that the signal scanner S correctly follows the recording trace on the information recording medium by the operation of the tracking control system.

When the information signal recording/reproducing method is operated in the reproducing mode, the movable contact V of the recording/reproducing switch 5Wrpl is switched to the fixed contact P side by the switching control signal supplied to the terminal 20e, and the signal scanner S( In this case, the reproducing element S.
...The signal read by the reproduction needle S) is given to the demodulator DHH via the preamplifier PAm which includes the signal detection circuit as described above, and the signal is demodulated by the demodulator DIEN. is sent to the output terminal 18.

Furthermore, when the information signal recording and reproducing method is operated in the reproducing mode, the signal scanner S obtains two different tracking reference signals f pi and f p2 from the recording trace for the tracking reference signal on the information recording medium. Since the readout signal is read out and applied to the preamplifier PAp, the tracking control system operates in the same manner as in the recording mode described above, and the actuator ACT of the tracking control system drives and displaces the signal scanner S. is made to correctly follow the recording trace on the information recording medium by the operation of the tracking control system.

In the example described above, it is assumed that two tracking reference signals having different frequencies are used, but in implementing the present invention, tracking reference signals in other signal formats (for example, in phase two tracking reference signals with different values) may be used.

(Effects of the Invention) As is clear from the detailed explanation above, the information signal recording and reproducing method of the present invention can be applied by applying electromagnetic waves or electric fields,
At least a recording layer made of a material (1) that causes a phase change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state by heating or the like. As a method for recording and reproducing information signals on an information recording medium, the electrode end is used in close proximity to the surface of the recording medium when recording information signals on the information recording medium or reproducing information signals from the information recording medium. a first recording/reproducing means for recording information signals on an information recording medium and reproducing information signals from the information recording medium by means of a signal scanner provided with electrodes;

A minute spot of light or a minute spot caused by other energy is formed in a state where the end of the electrode in the signal scanner in the first recording/reproducing means is separated from the surface opposite to the surface of the recording medium to which it is close. a second recording/reproducing means for recording information signals on the information recording medium and reproducing the information signals from the information recording medium; If a recording operation is in progress,
The information signal recorded on the information recording medium by the first recording and reproducing means described above is immediately reproduced from the information recording medium by the second recording and reproducing means described above, and
When an information signal is recorded on the information recording medium by the recording/reproducing means, the information signal recorded on the information recording medium by the second recording/reproducing means is transferred to the first recording/reproducing means. A method for recording and reproducing information signals that is immediately reproduced from an information recording medium by using a method that changes the phase from an amorphous state to a crystalline state, or from a crystalline state to an amorphous state by applying electromagnetic waves or electric fields, heating, etc. A method for recording and reproducing information signals on an information recording medium that is provided with at least a recording layer made of a material that causes a phase change to a state and on which a tracking reference signal is recorded in advance, the information recording medium as described above. When recording information signals on or reproducing information signals from an information recording medium, recording of information signals on the information recording medium is performed using a signal scanner equipped with an electrode whose electrode end is used close to the surface of the recording medium. and a first recording/reproducing means in which information signals from an information recording medium are reproduced under tracking control, and ends of electrodes of the signal scanner in the first recording/reproducing means are close to each other. Recording of information signals on an information recording medium and reproduction of information signals from the information recording medium using a minute spot of light or a minute spot of other energy at a distance from the surface of the recording medium opposite to the surface of the recording medium being recorded. and a second recording and reproducing means in which the recording and reproducing means are performed under tracking control, and the recording operation of the information signal on the information recording medium is performed under tracking control by the first recording and reproducing means. The information signal recorded on the information recording medium by the first recording and reproducing means is immediately reproduced from the information recording medium under tracking control by the second recording and reproducing means, and When the recording/reproducing means is performing an operation of recording an information signal onto the information recording medium, the information signal recorded on the information recording medium by the second recording/reproducing means is recorded by the first recording/reproducing means. Since this is an information signal recording and reproducing method that is immediately reproduced from an information recording medium under tracking control, the information signal recording and reproducing method of the present invention allows simultaneous monitoring while performing high-density recording and reproducing operations. Moreover, recording and reproduction can be easily performed under tracking control.Furthermore, when reproducing information signals from an information recording medium, conductivity in the recording layer of the information recording medium is By adopting a method of detecting a change in electrical resistance value or a method of detecting a change in capacitance value, recorded information in a recording form based on a change in temperature can be reproduced by a reproducing device with a simple configuration. Therefore, all of the conventional problems mentioned above can be satisfactorily solved by the present invention.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the information signal recording/reproducing method of the present invention, FIGS. 2 to 9, and (b) of FIG. 10.
, (c) is a vertical cross-sectional side view of the information recording medium, and (a
) is a partially enlarged plan view of an information recording medium, and FIG. 11 is a perspective view of an example of a signal scanner. D... Information recording medium, S... Signal scanner, ACT.
...Actuator, PH...Recording and reproducing section that performs recording and reproducing using electromagnetic waves, F...
・Transfer mechanism section, S Wrpl, S Wrp2... recording/reproduction changeover switch, SWr, SWp... switch, TS
C...Tracking control circuit, PA+s, PAp...
- Preamplifier, 21... Transfer body, 22... Transfer motor, 23... Feed screw, 24...-Guide rod, 25...
...Laser light source, 30...Reflector, 31...Objective lens, 32...Signal detection circuit, 33...Tracking control drive circuit, 2. Sticky note 3. Mouthpiece 4. Procedure correction of Showa era 5 (Spontaneous) December 2, 1980 Patent Application No. 77161 2, Name of the Invention Information Signal Recording and Reproduction Method 3, Relationship with the Amendment Person Case Patent Applicant Location Yokohama, Kanagawa Prefecture 3-12 Moriyamachi, Kanayo-ku, Ichi Name (432) Japan Victor Co., Ltd. 4, Agent address: 3-4-19-915, Higashina-yo, Tokyo Parts-day Ward, Showa (Monday, Showa) (Shipping date: Month, Showa) 6. Detailed explanation of the invention in the specification to be amended 7. Contents of the amendment Amend "Figure 9" to "Figure 10" on page 16, line 4 of the specification. Procedural amendment (voluntary) 1. Indication of the case Patent Application No. 77161 of 1982 2, Name of the invention Information signal recording and reproducing method 3, Person making the amendment Relationship with the case Patent applicant Location 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Name (432) Victor Company of Japan Co., Ltd. 4, Agent address No. 7, 19-915, 3-4, Toshinayo, Tokyo Parts Store, page 15, line 13 of the statement of contents of the amendment, “Mizo de” is as follows: Correct as shown below. [Groove (Groove G is used for the same purpose as the well-known guide groove conventionally provided in information recording media to perform optical tracking control using a light spot).

Claims (1)

[Claims] 1. Recording using a material that undergoes a phase change from an amorphous state to a crystalline state, or from a crystalline state to an amorphous state, due to the application of electromagnetic waves or electric fields, heating, etc. A method for recording and reproducing information signals on an information recording medium configured to include at least a layer, wherein when recording an information signal on the information recording medium or reproducing an information signal from the information recording medium, a layer is formed on the surface of the recording medium. a first recording/reproducing means in which recording of an information signal on an information recording medium and reproduction of an information signal from the information recording medium are performed by a signal scanner having electrodes whose electrode ends are used close to each other; ,
A minute spot of light or a minute spot caused by other energy is formed in a state where the end of the electrode in the signal scanner in the first recording/reproducing means is separated from the surface opposite to the surface of the recording medium to which it is close. a second recording/reproducing means for recording information signals on the information recording medium and reproducing the information signals from the information recording medium; If a recording operation is in progress,
The information signal recorded on the information recording medium by the first recording and reproducing means described above is immediately reproduced from the information recording medium by the second recording and reproducing means described above, and
When an information signal is recorded on an information recording medium by the recording/reproducing means described in the above-mentioned 2.
Information signal recording and reproducing method 2, in which the information signal recorded on the information recording medium by the recording and reproducing means is immediately reproduced from the information recording medium by the first recording and reproducing means, application of electromagnetic waves and electric fields, heating, etc. The recording layer includes at least a recording layer made of a material that causes a phase change from an amorphous state to a crystalline state or a phase change from a crystalline state to an amorphous state, and a tracking reference signal is recorded in advance. This is a method for recording and reproducing information signals on an information recording medium such as the above, in which an electrode end is close to the surface of the recording medium when recording an information signal on the information recording medium or reproducing an information signal from the information recording medium. The recording of the information signal to the information recording medium and the reproduction of the information signal from the information recording medium are performed under tracking control by a signal scanner provided with electrodes as used in the first embodiment.
A recording/reproducing means, and a minute light spot or other light spot separated from the surface opposite to the recording medium surface to which the end of the electrode in the signal scanner in the first recording/reproducing means is in close proximity. a second recording/reproducing means for recording an information signal on the information recording medium and reproducing the information signal from the information recording medium using a minute spot of energy under tracking control; When the recording/reproducing means records the information signal onto the information recording medium under tracking control, the information signal recorded on the information recording medium by the first recording/reproducing means is recorded on the information recording medium by the second recording/reproducing means. When the recording/reproducing means immediately reproduces information from the information recording medium under tracking control, and the recording/reproducing means described above is performing the recording operation of the information signal onto the information recording medium, the aforementioned second recording/reproducing means The information signal recorded on the information recording medium by the recording/reproducing means of No. 2 is
An information signal recording and reproducing method in which the information signal is immediately reproduced from an information recording medium under tracking control using a recording and reproducing means.