JPS61162829A - Substrate of information recording medium - Google Patents

Abstract

PURPOSE:To prevent the breakage of a groove by providing a formation part for pits, a formation part for grooves, and a plane part in a plane area in series. CONSTITUTION:The substrate of an information recording medium is provided with the formation part where pits p1, p1... are formed with a tracking refer ence signal, the formation part where grooves (g), (g)... are formed to specific depth as the tracking reference signal, and plane parts (f), (f)... in series as shown by an arrow X. Geometric shape variation by the tracking reference signal which is used for tracking control over a recording element and a repro ducing element by a different tracking control system employed by plural kinds of recording and reproduction systems in the recording of an information signal on the information recording medium and in the reproduction of the information signal from the information recording medium is formed previously on the substrate of the information recording medium at both sides of a recording track in a recording area. Consequently, even when a reproducing stylus is used for reproducing an information signal from the information recording medium, a sliding surface does not wear partially to make the sliding surface rugged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is applicable to, for example, image information memory, document files,
High-density recording of various information signals such as video and audio signal memory, digital data memory, etc.

Substrates of information recording media used in reproducible information recording media, especially those that undergo phase changes 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. Recording of an information signal on an information recording medium configured with at least a recording layer made of a material that causes a phase change and reproduction of an information signal from the information recording medium are performed by irradiating a light spot with a minute diameter or by using a light spot with an electrode. The present invention relates to a substrate for an information recording medium that can be reproduced by a reproducing needle.

(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 (e.g., TeO) 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, electric fields, heating, etc. In a recording medium having a configuration in which a recording layer is provided on a substrate and a thick layer of a material transparent to light is provided on the upper surface of the recording layer, the intensity is modulated by an information signal through the substrate. recording an information signal on the recording layer of the recording medium by projecting a minute spot of laser light on the recording layer of the recording medium and causing a phase change in accordance with the information signal by the heat of the laser beam;
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. The information signal recorded in the state of An information signal recording and reproducing method in which an information signal is reproduced as a change in capacitance by bringing a reproducing needle equipped with an electrode for detecting changes in capacitance into contact with a recording layer in which capacitance is recorded. but.

It is attracting attention partly because it has the possibility of being rewritten.

It is well known that tracking control has been conventionally employed as a means for recording and reproducing information signals on and from information recording media at high recording densities.

(Problems to be Solved by the Invention) By the way, when recording an information signal on an information recording medium,
When reproducing information signals from information recording media.

Various methods have been proposed as means for tracking control of recording elements and reproducing elements, but among them, there is a method in which a change in geometric shape is formed in advance on an information recording medium by a tracking reference signal. There have also been proposals to keep it in place.

In this case, the form of the tracking reference signal to be adopted is appropriate depending on the recording/reproducing method. If you are
Continuous grooves of a certain depth are often adopted as changes in the geometric shape to obtain tracking reference signals configured on information recording S media, and recording and reproducing of information signals is performed silently. In the case where the change is made by detecting a change in capacitance value, the bit arrangement according to the tracking reference signal is adopted as the change in the geometric shape to obtain the tracking reference signal configured on the information recording medium. depending on the recording/reproducing method being applied.

Each one is different.

Therefore, for an information recording medium on which recording and reproduction can be performed using a plurality of recording and reproduction methods.

Changes in the geometric shape due to the tracking reference signal are
In the case where the information recording medium is formed in advance, the changes in the geometric shape due to the tracking reference signals adopted in the multiple recording/reproducing forces and formulas to be applied are determined in advance on the information recording medium. It is necessary to keep it formed.

In view of the above-mentioned points, the applicant company has previously proposed that, for example, as described as an example in the memorandum of Japanese Patent Application No. 59-77160, the bottom of the groove that is continuously formed is , ・We have proposed a device that can record and reproduce information signals using an information recording medium in which bits are arranged according to tracking reference signals, and by implementing it, it is possible to achieve the desired effect. I was able to list it.

However, in the information recording medium proposed above, bits are arranged based on tracking reference signals at the bottom of grooves that are continuously formed. However, if grooves or bits are not always formed at a constant depth, or if a playback needle is used to play back information signals from an information recording medium, the sliding surface of the playback needle may not always be formed continuously. Protrusions are formed on the sliding surface due to partial abrasion of the grooves, which may damage the grooves when the playback needle is moved in the radial direction of the information recording medium. It was not inevitable that this would occur, and improvement was required.

(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. Recording of information signals on an information recording medium that is configured to include at least a recording layer made of a material that generates light, and reproduction of information signals from the information recording medium can be performed by irradiating a light spot with a minute diameter or by using a reproduction needle with an electrode. A substrate of an information recording medium that can be recorded using the above-described information signal, and the planar shape of the recording trace due to the information signal on both sides of the recording area where the information signal is to be recorded concentrically or spirally. A region having a planar shape similar to the above is provided with a region in which pits are formed by a tracking reference signal, a region in which a groove of a predetermined depth is formed to serve as a tracking reference signal, and a planar region are provided in series. It provides a substrate for an information recording medium.

(Example) Hereinafter, specific contents of the substrate of the information recording medium of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1(a) is a perspective view of the substrate of the information recording medium of the present invention, and FIG.
FIG. 1B is a partially enlarged sectional view of the circled portion in FIG. 1A. Further, FIGS. 2 and 3 are plan views of a part of the substrate of the information recording medium of the present invention.

In FIG. 1(a), 1 is a substrate of an information recording medium, and this substrate 1 is made of a resin material such as acrylic resin, polycarbonate resin, or vinyl chloride resin.

In FIG. 1(a), 2 is a center hole provided at the center of the substrate 1 of the information recording medium.

3 and 3.3 in FIG. 1(b) are bit formation parts (or grooves of a predetermined depth that are used as tracking reference signals) formed on the substrate 1 of the information recording medium by the tracking reference signal. (The depth of the bit or groove is exaggerated in the figure.)

In Figs. 2 and 3, PlePl..., p2゜p2... indicate bits based on the tracking reference signal, and 1gag... indicates the bit at a predetermined depth that is used as the tracking reference signal. indicates the groove, and also f, f
... is a planar part (groove g2g, bit p1, p2,
...is not formed), and furthermore, 1.1
. . . indicates a recording area in which an information signal is to be recorded, and the recording area 1.1 .

The substrate of the information recording medium of the present invention has recording areas t, t where information signals are to be recorded concentrically or spirally.
A pit P L P 2 caused by the tracking reference signal is formed in an area having a planar shape similar to the planar shape of the recording trace caused by the above-mentioned information signal on both sides of ...
, a groove gsg of a predetermined depth that serves as a tracking reference signal, and a planar partial molecule f are provided in series. However, pits p are formed on the surface of the substrate 1 of the information recording medium by the tracking reference signal.1. p2... or a groove gyg of a predetermined depth that is used as a tracking reference signal...
・For example, a well-known technique for forming sound grooves in a one-disc record or a pit forming technique for a video disc, that is, a technique for transferring a predetermined pattern onto a resin material using a stand bar, is used. It can be easily implemented using

As described above, in the substrate of the information recording medium of the present invention, the portion where the pits pl, pi... (or the portion where the bits P2#P2... are formed) are formed by the tracking reference signal.

A portion where a groove gag... having a predetermined depth is formed to serve as a tracking reference signal, and a planar portion.

f... are provided in series in the direction of the arrow X in FIGS. 2 and 3, and in FIG. A serial arrangement pattern is illustrated.

The serial arrangement pattern of the above-mentioned parts on the substrate l of the information recording medium in FIG.
2. a groove gyg of a predetermined depth to be used as a tracking reference signal.
The tracking reference signal described above is arranged in such a manner that planar partial molecules, f..., each having approximately the same length, are interposed between the forming portions of... Bit p 1. p 1...(or.

A forming part of a bit P L P 2...), a forming part of a groove gag... of a predetermined depth that is used as a tracking reference signal, and a planar part molecule, f...
This is an example of a configuration in which the above-described parts on the substrate 1 of the information recording medium in FIG.
Tracking reference signal number; bit p 1. p 1
. . . (or the formation portion of the bit P 2. p 2 . . . ) and the formation portion of the groove g9g . A group is formed by arranging the above-mentioned parts without a large interval between them, and a plane-shaped part molecule is placed between each group configured as described above.

The bits p 1 . p 1
... (or the forming part of bit p2. This is an example of a configuration in which the partial molecules, f... are arranged in series. In the serial arrangement pattern of each part, a part where bits P L, p 1 . . . are formed by the tracking reference signal, and a part where bits P 2 are formed
#P2... is sandwiched on both sides by the formed part, and both sides are sandwiched by the formed part of the groove gag... of a predetermined depth that is used as a tracking reference signal. Regarding the state part, it is clearly recognized in each figure as recording areas 1, 1..., but the recording areas 1, 1... in the planar partial molecule f... are not clear from the illustrations. However, regarding the above-mentioned planar partial molecule f..., the recording area 1.1... exists in the extension of the recording trace that is clear in the figure, as described above. Needless to say (in FIGS. 2 and 3, the existence of recording areas 1.1, . ).

In each of the configuration examples shown in FIGS. 2 and 3 above, the bit p due to the tracking reference signal
1. p 1... (or bit p2.P2...
(formation part) and the length of the formation part of a groove gel of a predetermined depth that is used as a tracking reference signal, and the planar part molecule.

It is a desirable embodiment that the lengths of f... are approximately equal.

Further, when the information signal to be recorded and reproduced on the information recording medium is a television video signal, the bit Plt P1*...
, p 2. If an intermittent recording mode is used in which P2... exists only in the period corresponding to the horizontal blanking period in the television video signal, the presence of the tracking reference signal is recorded on the information recording medium. It is possible to prevent any interference from being caused to the television video signal.

Substrate 1 of the information recording medium of the present invention configured as described above
For example, a material 1 that undergoes a phase change from an amorphous state to a crystalline state or from a crystalline layer to an amorphous state by applying electromagnetic waves or an electric field to it, heating, etc.
An information recording medium is formed by forming a recording layer with a predetermined thickness, for example, 1000 angstroms to 1500 angstroms, using a material such as Ox, Ge, or Sn by a film forming method such as a vapor deposition method or a sputtering method. It is done.

It goes without saying that a protective layer or the like is provided on the recording layer configured as described above.

In addition, the bit p due to the tracking reference signal mentioned above
1 and bit P2 based on the tracking reference signal are signals of different single frequencies (for example, 511K
Hz frequency signal and 716 KHz frequency signal)
It may be formed using

(Effects) As is clear from the above detailed explanation, the substrate of the information recording medium of the present invention 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. Recording of information signals on the recording medium and reproduction of information signals from the information recording medium are performed using a light spot with a minute diameter. A substrate of an information recording medium that can be irradiated with irradiation or using a reproducing needle with an electrode, wherein the irradiation is performed on both sides of a recording area to be recorded concentrically or spirally by an information signal. In an area with a planar shape similar to the planar shape of the recorded trace formed by the information signal, there are formed a bit forming part by the tracking reference signal, a groove forming part of a predetermined depth to be used as a tracking reference signal, and a planar shape. Therefore, in an information recording medium constructed using the information recording medium substrate of the present invention, information signals for the information recording medium are provided on both sides of the recording trace in the recording area. Tracking reference used for tracking control of recording elements and reproducing elements by different tracking control methods adopted in multiple types of recording and reproducing methods when recording information signals from information recording media and when reproducing information signals from information recording media. Since a change in the geometrical shape caused by the signal is formed in advance on the substrate of the information recording medium, a continuous groove of a certain depth is formed in the information recording medium in order to obtain a tracking reference signal. Recording and reproducing of information signals, such as when recording and reproducing information signals is performed by irradiating a light spot, and when recording and reproducing information signals is performed by forming a bit array according to the tracking reference signal on the information recording medium to obtain the tracking reference signal. It goes without saying that recording and reproducing information signals using a plurality of different recording and reproducing methods can be performed satisfactorily under tracking control. On both sides of the recording area that is to be recorded concentrically or spirally by the signal, a bit formation part by the tracking reference signal and a tracking reference are placed in an area having a planar shape similar to the planar shape of the recording trace by the information signal described above. In addition to the groove forming part of a predetermined depth that is used as a signal, a flat part is provided in series, so that a reproducing needle can be used to reproduce information signals from an information recording medium. Even in cases where the sliding contact surface is partially worn out and convex parts are not formed on the sliding contact surface, the drawbacks that occurred in the previously proposed information recording media as mentioned above can be avoided. resolved.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view of the substrate of the information recording medium of the present invention, and FIG. iv! Cb) of I is a side sectional view of a part of the substrate of the information recording medium of the present invention, and FIGS. 2 and 3 are plan views of a part of the substrate of the information recording medium of the present invention. 1... Substrate of information recording medium, 2... Center hole, 3...
・Bit by tracking reference signal (or groove of a predetermined depth that is used as a tracking reference signal), P
le P2...Bit based on a tracking reference signal, g...Groove of a predetermined depth to be used as a tracking reference signal,

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. Recording of an information signal on an information recording medium configured to include at least a layer and reproduction of an information signal from the information recording medium can be performed using irradiation with a light spot with a minute diameter or a reproduction needle with an electrode. A substrate of an information recording medium configured as shown in FIG. A substrate 2 of an information recording medium in which a region is provided in series with a region in which pits are formed by a tracking reference signal, a region in which a groove of a predetermined depth is formed to serve as a tracking reference signal, and a planar region. , the sum of the lengths of the portion where pits are formed by the tracking reference signal and the portion where grooves of a predetermined depth for tracking are formed and the length of the planar portion are set to be approximately equal. Substrate of the information recording medium according to item 1