JPS60219652A - Recording and reproducing device of information signal - Google Patents

Abstract

PURPOSE:To realize a higher recording density with simple mechanism by making an electromagnetic wave incident from a face opposite to a recording medium face to which an electrode terminal of a signal scanning device comes close. CONSTITUTION:The electromagnetic wave incident from the face opposite to the recording medium face to which an electrode terminal of an electrode 9 of a recording element S comes close is used as laser light. Then the intensity of the laser light is selected to a value heating the said recording layer to a temperature slightly lower than the temperature causing the phase change in constituting material of the recording layer. Thus, the signal scanning element S having the very thin electrode 9 in recording and reproducing the information signal is used, and then the information signal is recorded on the recording layer of the information recording medium D in the state of very high recording density and the information signal is reproduced.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an information signal recording and reproducing device, and in particular, to recording and reproducing information signals using an information recording medium that is rewritable and capable of high-density recording and reproduction. The present invention relates to an information signal recording and reproducing device configured to perform the following.

(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. Materials that undergo 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, electric fields, heating, etc.
Information is transferred through the substrate to the recording layer of a recording medium having a recording layer made of (To, Ox) on the substrate, and a thick layer of a material transparent to light on the upper surface of the recording layer. A minute spot of laser light whose intensity is modulated by the signal is projected onto the recording layer of the recording medium, and the heat of the laser beam causes a phase change in accordance with the information signal, thereby transferring information to the recording layer of the recording medium. record the signal,
Further, as described above, a laser beam spot of a certain intensity is applied to the recording layer in which an information signal is recorded by a phase change according to the information signal, and the recording layer of the recording medium undergoes a phase change. It is also possible that the optical recording and reproducing method for information signals, which reproduces information signals recorded as states by photoelectrically converting light reflected from the surface of the recording layer, may also be rewritten. It is attracting attention.

(Problem that the invention attempts to solve) The above-mentioned optical recording and reproducing method of the information signal is as follows.

Since a minute spot of light is used to record and reproduce information signals, the recording and reproduction mechanism is complicated and expensive, and even if higher recording density is desired, it is difficult to achieve it. The problem was that it was.

In other words, since the use of an optical system is essential, it is inevitable that the mechanism will be complicated and expensive, and the size of the light spot is theoretically determined based on the wavelength of the light used. This makes it difficult to realize even higher density recording and reproduction.

(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. As an information signal recording and reproducing apparatus that performs recording and reproduction using an information recording medium that is configured with at least a recording layer made of a material such as At the time of recording, the information signal to be recorded is supplied to the electrode of the signal scanner that has the signal scanner, and the recording medium surface where the electrode end of the electrode □ in the signal scanner is brought close as described above. Electromagnetic waves are incident on the recording layer of the information recording medium from the side opposite to the side opposite to the side of the recording medium where the electrode end is brought close to the recording layer of the information recording medium according to the information signal. An information signal recording and reproducing apparatus, wherein electromagnetic waves are made incident on the recording layer of the information recording medium, so that recording is performed in the recording layer of the information recording medium with different conductive bottoms depending on the information signal; 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, due to the application of electromagnetic waves, electric fields, heating, etc. The electrode end of the electrode of the signal scanner is brought close to the recording medium surface of the recording medium on which recording is being performed, with the conductive bottom being in a different state depending on the information signal. Provided is an information signal recording and reproducing apparatus which reproduces, via a signal scanner, an information signal recorded on a recording layer of a recording medium as a change in the conductive bottom according to the information signal, and the above-mentioned This solves the problems of the conventional method.

(Example) Hereinafter, specific contents of the information signal recording and reproducing apparatus 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 an information serial number recording and reproducing apparatus according to the present invention. The recording medium is described as being a disc-shaped information recording medium.

In the information signal recording and reproducing apparatus 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 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 from an amorphous state to an amorphous state.

2 to 7 are recordings of information signals according to the present invention.

FIG. 3 is a longitudinal side view of an example of voice recording of each member of the information recording medium used in the recuperation device. In FIGS. 2 to 7, reference numeral 1 denotes 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 from a crystalline state to an amorphous state by applying an electromagnetic wave or an electric field, or by heating a body. A layer having a predetermined thickness, for example, 1000 angstroms to 1500 angstroms, is formed by a film forming method such as vapor deposition or sputtering using a material such as TeOx, Ge, Sn, etc. .

3 is the shortest recording wavelength recorded on the information recording medium.
The dielectric layer 3 is a dielectric layer having a thickness of /2 or less, and the 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.
It may have a thickness of about 1- to 100 Ω/J.

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 1 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.
With materials like x, Go, Sn.

A recording layer having a thickness of, for example, about 1000 angstroms to 1500 angstroms, made of a material suitable for being dielectrically heated in accordance with the information signal during recording of the information signal, for example, a mixture with barium titanate. 7 is a substrate configured such that the substrate itself is conductive.

In the information recording medium shown in FIGS. 2 to 7, the above-mentioned substrate 1 in the recording medium, the substrate 7 itself configured to have conductivity, etc. have a flat surface. In some cases, it is configured with a bit array formed by a tracking reference signal on its surface. In an information recording medium constructed using a substrate of the present invention, recording and reproducing operations of information signals on the information recording medium can be performed under tracking control.

Substrate 1. Alternatively, to form pits using a tracking reference signal on the surface of the substrate 7, etc., a technique for forming sound grooves in a one-disc record, for example, 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 jt 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 Pp..., and Fig. 10 is a case where pits PDP...p... are formed at the bottom of the groove by a tracking reference signal. A partially enlarged plan view ((a) in Fig. 1θ) and a partially enlarged longitudinal sectional view ((b) and (C) in Fig. 10) of The pattern of pits Py Pt P... is a pit Py based on a tracking reference signal on both sides of each recording trace tl, t2... where an information signal to be recorded and reproduced on an information recording medium is to be recorded and reproduced. This is a pattern when Pt P... is recorded and formed continuously, and the pattern of pits P* Py... based on the tracking reference signal shown in FIG. Pit PDPs are intermittently recorded and formed by tracking reference signals on both sides of each recording trace tl, t2, where the information signal to be recorded and reproduced on the recording medium is to be recorded and reproduced. This is the pattern when it is set to .

When the information signal to be recorded and reproduced on an information recording medium is a television video signal.

By adopting the pattern of pits Pa Py P... caused by the tracking reference signal as shown in FIG.
If an intermittent recording mode is used in which tP... exists only in one period corresponding to the horizontal blanking period in the television video signal, the presence of the tracking reference signal will cause the information W to be recorded on the recording medium. It is possible to prevent any interference from being caused to the television video signal being displayed.

By the way, as mentioned above, the pits Py Pt P... due to the tracking reference signal are formed on both sides of the recording trace where the information signal to be recorded and reproduced is to be recorded and reproduced on the information recording medium, as shown in FIG. When records are formed intermittently as shown in the figure, unrecorded areas (Ig, !g... However, using the above-mentioned non-recording portion for recording and reproducing other information signals improves the recording density of the information recording medium. It is also useful from this point of view.

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. Then, the depth d of the grooves G, G, G... is selected to be shorter than the recording wavelength of the pit PeP... 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 vertical side view taken along line cc in the plan view shown in (q).

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

Figure 2 shows materials that undergo 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., such as To.
A thin layer of a material such as Go, 8n is deposited on a substrate 1 as a recording layer 2 by applying a vapor deposition method or a sputtering method.
FIG. 2 is a longitudinal cross-sectional side view of an information recording medium constructed by adhering and forming the same.

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, since 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, the entire surface of the recording layer 2 is amorphous. is in a state of

When recording an information signal on the recording layer 2 whose entire surface is in an amorphous state as described above, the minute outer spot-like portion of the recording layer 2 is recorded a.
After heating the layer to a temperature above the softening or melting point of the material forming the layer, that part is slowly cooled so that the minute spot-like part becomes crystallized.
Information signals can also be recorded on the recording layer 2, but 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 form the recording Ji 12. It is better to record the material by heating it to a temperature above the melting point of the material and then rapidly cooling it so that the minute spot-like part becomes amorphous. Because it is easy to implement, it is possible to use 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. After forming a thin layer on the substrate 1 by applying a vapor deposition method or a sputtering method, the entire surface of the thin layer is irradiated with light from, for example, a flash lamp, and the constituent materials of the thin layer are heated to their softening point. A recording layer 2 whose entire surface is crystallized is formed on the substrate 1 by raising the temperature to a temperature higher than the melting point and then slowly cooling the recording layer 2 whose entire surface is crystallized as described above. Information signals are generated by heating a minute spot-like portion of the recording layer 2 to a temperature higher than the softening point or melting point of the material forming the recording layer 2, and then rapidly cooling the portion. (The same applies to the information recording media shown in FIGS. 3 to 7).

Next, in the information recording medium shown in FIG. 31, the recording layer 2 of the information recording medium shown in FIG. A dielectric layer 3 having a thickness of 172 mm or less of the shortest recording wavelength is formed 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 has been established. The above-mentioned AT body layer 3 is
As mentioned above, it 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 storage medium shown in FIG.
A dielectric layer 5 made of a dielectric material such as pallium titanate is formed on the top surface, and then an amorphous layer is formed on the top surface of the dielectric layer 5 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. A dielectric layer 3 having a thickness of 1/2 or less 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 conductive 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, therefore, in the information recording medium shown in Figure 6, electromagnetic waves and electric fields are applied.

For materials in the recording layer 6 that undergo 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 heating or the like.

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. 6. .

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 made of a mixture of a dielectric material and a material that undergoes a phase change to an amorphous state is provided.

The information recording medium shown in FIG. 7 does not require the conductive layer 5 that was required in the information recording medium described with reference to FIG. It becomes possible to apply a method of detecting a change in capacitance, a method of detecting a change in electrical resistance, etc.

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 first
1 has a configuration 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, 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.

In the recording layer of the information recording medium, a high frequency electric field whose intensity is modulated by the information signal is applied to the electrode 9 of the recording element described above.
As a result, an amorphous state portion and a crystalline portion are generated in the recording layer of an information recording medium in response to the above-mentioned high frequency electric field, and an information signal is recorded. In order to record an information signal on the recording layer of the information recording medium by the high-frequency electric field supplied to the electrode 9 of the recording/reproducing element S, the temperature of the recording layer of the information recording medium is raised to the above-described predetermined temperature or higher. A problem arises in that a strong high-frequency electric field is required for this purpose.

Therefore, in the information signal recording and reproducing apparatus of the present invention, phase change from an amorphous state to a crystalline state, or a phase change from a crystalline state to an amorphous state, is achieved by application of electromagnetic waves or electric fields, heating, etc. When recording information signals on an information recording medium that includes at least a recording layer made of a material that causes The recording medium surface where the electrode end of the electrode 9 in the recording element winding S is brought close to is supplied as described above. By making electromagnetic waves incident on the recording layer of the information recording medium from the opposite side, even if the high frequency electric field to be supplied to the electrode 9 of the recording element S is weak, the information recording medium This allows recording to be performed on different recording layers with different electrical conductivities depending on the information signal.

In the embodiment shown in the first figure, the electromagnetic wave incident from the surface opposite to the surface of the recording medium to which the electrode end of the electrode 9 of the recording element S is close is used as laser light.

In addition, the laser beam is set so as to be applied to a portion corresponding to the portion where the electrode end of the electrode 9 of the recording element S is close to, and the laser beam is applied to a portion corresponding to the portion where the electrode end of the electrode 9 of the recording element SK is close to. The laser beam incident from the surface opposite to the surface of the recording medium used is of such intensity as to heat the recording layer to a temperature slightly lower than the temperature that causes a phase change in the constituent materials of the recording layer. It is being made into something.

When reproducing an information signal from an information recording medium on which the information signal has been recorded as described above, a reproducing element (having the configuration shown in FIG. 11) is installed on the recording medium surface of the information recording medium. The sliding surfaces of the reproducing element (which may have the same configuration as the recording element) are brought into sliding contact, the connecting wires connected to the electrodes are connected to a signal detection circuit, and the signal detection circuit detects the information recording medium. This allows information signals recorded on the recording layer to be reproduced.

In the signal detection circuit described above, the information signal is detected based on the difference in electrical conductivity between the amorphous state portion and the crystalline portion of the recording layer of the information recording medium. As a method for detecting the difference in electrical conductivity between an amorphous state part and a crystalline part in a recording layer of an information recording medium, for example, one method is to detect a difference in electrical conductivity between an amorphous state part and a crystalline part in the recording layer of an information recording medium. Detection of a difference in electrical resistance value between a crystalline portion or, for example, detection of a difference in capacitance value between an amorphous portion and a crystalline portion of a recording layer of an information recording medium can be employed.

To detect the difference in capacitance between an amorphous portion and a crystalline portion of the recording layer of an information recording medium, an information signal from a video disc that detects changes in capacitance is used. A signal detection circuit with the same configuration as the signal detection circuit used during playback.

That is, the capacitance between the electrode of the reproduction needle and the recording layer of the information recording medium is connected to the semi-coaxial resonator coupled to the tank circuit of the ultrahigh frequency oscillator, and the capacitance between the electrode of the reproduction needle and the recording layer of the information recording medium is It is possible to use a known configuration in which a reproduction signal corresponding to the content of information recorded in the recording layer is obtained as a change in current.

The pit F of the tracking reference signal is recorded in advance on the information recording medium.
When DP... is formed, the circular recording element S (signal scanning element S) is integrally driven and displaced by the actuator ACT of the tracking control system, so that the recording element S is under tracking control. Recording operation while correctly following the recording trace on the information recording medium (same as playback operation)
Do the following.

In FIG. 1, reference numeral 17 is an input terminal for the main information signal to be recorded and reproduced (for example, a color TV screen video signal), and when the information signal recording and reproducing apparatus is in the recording mode. , the main information signal supplied to the input terminal 1 is converted into a modulated signal in the modulation lI (for example, FM modulation @) NOD, is amplified by the recording amplification @RM, and is supplied to the adder DD. .

The adder ADD combines the output signal from the recording amplifier Rm and the signal supplied to the terminal 1g (for example, a signal representing the rotational phase of the information recording medium...in the following explanation, a signal fp3 with a frequency of f3). ) is added to give a recording signal to the fixed contact R of the recording/reproducing switch 5Wrp.

Recording and reproduction of information signals: When the device is in the recording mode, the movable contact V of the recording/reproduction switch 5Wrp is switched to the fixed contact R by the switching control signal supplied to the terminal 20.
The recording signal is supplied to the recording element S.

The recording trace consisting of the bit arrangement based on the tracking reference signal recorded in advance on the information recording medium is
Record traces tl, t2 for each round of the information recording medium. t3・
... (FIGS. 81 and 9), respective predetermined tracking reference signals whose frequencies are selected so as to occupy a frequency band different from that of the main information signal are recorded. In the following explanation, record traces tl, t3. ...t
(2n+1), a tracking reference signal fpl with one frequency fl is recorded, and a recording trace t2.
t4. . . . It is assumed that a tracking reference signal fp2 having a frequency of f2 is recorded for t(2n).

Therefore, in the state where the recording element S is tracing the recording trace for the main information signal on the information recording medium to record the main information signal, the recording element S records the information existing on both sides of the recording trace for the main information signal described above. Two mutually different tracking reference signals f PI from the recording trace for the tracking reference signal on the recording medium,
Read f p2 and feed to preamplifier @PAp.

The preamplifier PAp is equipped with the signal detection circuit described above, and the output signal number from the preamplifier PAP, the bandpass filters BPFI, BPF2 . Given to BPF3. The bandpass filter BPFI extracts the signal fpl, the bandpass filter BPF2 extracts the signal fP2, and the bandpass filter BPF3 extracts the signal fp3.

Signal fP extracted by bandpass filter 1IBPFI, BrF3
1°fp2 is given to the signal polarity switching circuit SvC, and the signal fP3 extracted by the bandpass filter @BPF3 is given to the switching pulse generator FF (flip-flop FF) via the detector Data.

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

The output signal from the signal polarity switching circuit SvC is sent to the detector De.
After being rectified and smoothed by tl and Det2, it is applied to the differential amplifier DA. The output signal of the differential amplifier Dm described above is converted into a tracking control signal in the servo circuit TSC, and is supplied to the actuator ACT of the tracking control system.

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

When the information signal recording and reproducing apparatus is operated in the reproducing mode, the switching control signal supplied to the terminal 20 switches the movable contact V of the recording/reproducing switch 5Wrp to the fixed contact P side, and the signal scanner S (in this case, the reproducing element S.
...The signal read by the regenerator S) is given to the demodulator DEH via the preamplifier P which is configured including the signal detection circuit as described above, and is demodulated by the demodulator DEM. The generated signal is sent to the output terminal 18.

Further, when the information signal recording and reproducing apparatus is operated in the reproducing mode, the reproducing element 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 it 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 reproducing element S.
The reproducing element S is made to correctly follow the recording trace on the information recording medium by the operation of the tracking control system.

In the above example, the two tracking reference signals are 1. Although it is assumed that devices with different frequencies are used, in carrying out the present invention, different frequencies may be used. Tracking reference signals in the form of signals (eg, two tracking reference signals with different phases) may be used.

An actuator A that drives and displaces the front signal scanner S (recording element, reproducing element) for tracking control.
Since the CT is attached to the transport body 21 in the transport mechanism F, the signal scanner S is moved in the radial direction of the information recording medium as the transport motor 22 rotates.

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 engages with the feed screw 23, and a hole that loosely fits into a guide rod 24. 21, however, it goes without saying that other configurations of the transfer mechanism F may be employed when implementing the present invention.

An electromagnetic wave projection section vS is also attached to the transfer body 21 in the transfer mechanism F described above, and as the transfer body 21 is transferred, the electromagnetic wave projection section WS also moves in the radial direction of the information recording medium. The electrode ends of the electrodes in the signal scanner S are brought close to the position opposite to the position of the electrodes 9 of the signal scanner S, which has the electrode ends close to the recording medium surface of the information recording medium as shown in FIG. Electromagnetic waves are made to enter the recording layer of the information recording medium from the side opposite to the recording medium side where the information recording medium is located.

In the embodiment shown in FIG. 1, the above-mentioned Ilt magnetic wave projection section l1lS is configured as a laser beam projection section US. That is, in the electromagnetic wave projection section wS shown in FIG. 1, 25 is a laser light source, and as this laser light source 25, for example, a semiconductor laser can be used. The laser beam emitted from the laser beam W125 described above is
δ Seven Shinsho 26 → Prism 27 → Polarizing Prism 28 →
From the back side of the recording layer through the substrate of the information recording medium via the 1/4 wavelength plate 29 → reflection fi 30 → objective lens 30,
The light is focused on the area where the tip of the electrode 9 of the signal scanner S is located.

Then, as described above, the electrode 9 in the signal scanning element S is
The light is incident from the surface opposite to the surface of the recording medium to which the electrode end is adjacent. The laser beam is of such intensity that it can heat the recording layer to a temperature slightly lower than the temperature that causes a phase change in the constituent material of the recording layer.

The area of the laser beam spot applied to the recording layer of the information recording medium as described above is larger than the area of the electrode 9 of the signal scanner S, and the area of the spot of the laser beam applied to the recording layer of the information recording medium is larger than the area of the electrode 9 of the signal scanner S and the electromagnetic wave projection section w.
Since the signal scanner S is being transported by the same transporting body 21, the range in which the signal scanner S is driven and displaced by tracking control is in a state where it is displaced within the spot of the laser beam. In this case, there is no need to separately perform tracking control for the laser beam, but if tracking control is also to be performed for the laser beam, the laser beam projected onto the recording layer of the information recording medium as described above should be A tracking reference signal may be extracted from the reflected light, a tracking control signal may be generated therefrom, and the reflecting mirror 30 may be driven and controlled using the tracking reference signal to perform tracking control. In the electromagnetic wave projection section S shown in FIG. 1, 32 is a tracking reference signal detection circuit, and 33 is a tracking control circuit.

(Effects of the Invention) As is clear from the above detailed explanation, the information signal recording and reproducing apparatus of the present invention can change the phase from an amorphous state to a crystalline state by applying electromagnetic waves, electric fields, heating, etc. An information signal recording and reproducing device that records and reproduces information using an information recording medium that includes at least a recording layer made of a material that undergoes a phase change or a phase change from a crystalline state to an amorphous state. At the time of recording, an information signal to be recorded is supplied to the electrode 9 of the signal scanner S, which has an electrode end close to the recording medium surface of the information recording medium. As shown in FIG. 2, electromagnetic waves are applied to the recording layer of the information recording medium from the surface opposite to the surface of the recording medium to which the electrode end of the electrode 9 in the signal scanner S is brought close to the recording layer of the information recording medium. An information signal recording and reproducing device that records information signals in states with different conductivities depending on the information signal, and a phase change from an amorphous state to a crystalline state by application of electromagnetic waves or electric fields, heating, etc. , or a recording layer in an information recording medium configured to include at least a recording layer 8 made of a material that undergoes a phase change from a crystalline state to an amorphous state, the recording layer having different electrical conductivity depending on the information signal. By bringing the electrode end of the electrode 9 of the signal scanner S close to the recording medium surface of the recording medium on which recording is being performed, the recording layer of the information recording medium is exposed to changes in conductivity according to the information signal. Since this is an information signal recording and reproducing device in which the recorded information signal is reproduced via the signal scanner S, the signal scanner S having an extremely thin electrode 9 can be used when recording and reproducing the information signal. , thereby forming the recording layer of the information recording medium.
It is possible to record information signals at an extremely high recording density and to reproduce information signals at extremely high recording density. By making the laser beam incident from the surface opposite to the laser beam have such an intensity that it can heat the recording layer to a temperature slightly lower than the temperature that causes a phase change in the constituent material of the recording layer. , the electric field strength due to the information signal to be applied to the electrode 9 of the signal scanner S can be made weak when recording the information signal, and furthermore, when reproducing the information signal from the information recording medium, the electric field strength of the information recording medium can be reduced. Information is recorded in a recording format based on changes in electrical conductivity in the recording layer by detecting changes in electrical resistance or capacitance.

A playback operation can be performed using a playback device with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the information signal recording and reproducing apparatus of the present invention, FIGS. 2 to 9, and (b) of FIG. 1O.
) and (C) are longitudinal sectional side views of the information recording medium. FIG. 10(a) is a partially enlarged plan view of the information recording medium, and FIG. 11 is a perspective view of an example of the signal scanner. D... Information recording medium, S... Signal scanner, Mu CT-
・Actuator, vs. Electromagnetic wave projection unit, F...
- Transfer mechanism section, 21... Transfer body, 22... Transfer motor, 23... Feed screw, 24... Guide rod, 25.
... Laser light source, 30... Reflector. 31...Objective lens, Figure 2 Figure 4 Tail 5 Oral procedure correction band (spontaneous) December 7, 1982 Manabu Shiga, Commissioner of the Patent Office 2, Recording and reproducing device for the name of the invention information signal 3 , Relationship to the case of the person making the amendment Patent Applicant Address 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa Name (432) Victor Company of Japan Co., Ltd. 4 Address of agent: Tokyo Parts Co., Ltd. No. 3-4-19-915, Showa, Month, Day (Shipping date: Showa, Month, Day) Page 13, line 18, Figure 9 of the specification is amended to ``Figure 1O''. Procedural amendment (voluntary) ■, Indication of the case 1982 Patent Application No. 77160 2, Name of the invention Information signal recording and reproducing device 3, Person making the amendment Relationship with the case Patent applicant Location: Yokohama City, Kanagawa Prefecture 3-12 Moriyamachi, Kanayo-ku Name (432) Victor Company of Japan Co., Ltd. 4, Agent 5, Date of amendment order (voluntary) 7. Details of amendment, page 13, line 7, groove F. Correct as follows. "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 spot of light)"

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. An information signal recording and reproducing apparatus for recording and reproducing information using an information recording medium having at least a layer, the apparatus having an electrode end that is brought close to the recording medium surface of the information recording medium. In addition to supplying the information signal targeted for recording during recording to the electrodes of the signal scanner,
As described above, electromagnetic waves are incident on the recording layer of the information recording medium from the surface opposite to the surface of the recording medium where the electrode ends of the electrodes in the signal scanner are brought close to each other, so that an information signal is transmitted to the recording layer of the information recording medium. An information signal recording and reproducing device 2 in which recording is performed with different conductivities depending on the information signal, and an information signal is incident from the surface opposite to the surface of the recording medium to which the electrode ends of the electrodes in the signal scanner are adjacent. The information signal according to claim 1, wherein the electromagnetic wave transmitted is light, and the light is applied to a portion corresponding to a portion of the electrode of the signal scanner where the electrode end is in close proximity. In the recording/reproducing device 3, the light incident from the surface opposite to the surface of the recording medium where the electrode ends of the electrodes in the signal scanner are in close proximity has a temperature higher than that which causes a phase change in the constituent material of the recording layer. 2. The recording of information signals according to claim 1, wherein the recording layer is so strong as to heat the recording layer to a slightly lower temperature. The reproducing device 4 includes at least a recording layer made of a material that undergoes a phase change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state upon application of an electromagnetic wave or electric field, heating, etc. The electrode end of the electrode of the signal scanner is brought close to the recording medium surface of the recording medium on which recording is performed in a state where the electrical conductivity differs depending on the information signal. The information signal recording and reproducing device 5 is configured to reproduce, via a signal scanner, an information signal recorded on a recording layer of an information recording medium as a change in a conductive bottom according to an information signal. An information signal recording and reproducing device 6 according to claim 4, wherein a change in electrical resistance is detected as a change in electric resistance value to obtain a reproduced signal, and a change in the conductive bottom is detected as a change in capacitance value. Claim 4 in which a reproduced signal is obtained by
Recording and reproducing device for information item i described in section