JPS6070543A - Information recording carrier - Google Patents

Abstract

PURPOSE:To obtain an information recording carrier enabled to rewrite at least a part of information easily and stably and increase its recording density by laminating a magnetic recording medium film and a non-magnetic laser light recording medium film on a non-magnetic substrate. CONSTITUTION:The information recording carrier 1a is obtained by laminating the non-magnetic substrate 2, the non-magnetic laser light recording film 3 and the magnetic recording film 4 in this order. The laser light recording film 3 consists of a reflection factor change recording medium, and when laser light 7 converged through an optical system (optical head) 8 formed on a transparent substrate 2 is irradiated to the film 3, an amorphous area 5 in the film 3 is phase-shifted to a crystalline area 6 and recording is executed. Reproducing is executed by laser light 7 converged through the optical system 8 similarly to the recording. On the other hand, data are recorded in the magnetic recording film 4 by supplying current to a coil 10 and forming a vertical magnetization recording area 11 by a recording head (magnetic head) 9 and the reproducing is executed by a reproducing head (magnetic head) 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information recording carrier that records video, audio, etc. at high density. More specifically, at least a portion of the information can be rewritten easily and stably, and the recording retention can be greatly increased compared to conventional magnetic recording media or laser optical recording media. related to information record carriers.

[Technical background of the invention and its problems]

In recent years, information processing systems have become dramatically larger in volume and smaller due to advances in VLSI technology and the development of optical devices.As a result, large amounts of information processed in a short period of time can be recorded at high density in a small space.・The need for preservation has arisen, and the development of high-density recording carriers has become an urgent issue.

On the other hand, in response to demands for energy conservation, information recording carriers are required to record only truly necessary information, so that information that is no longer needed can be erased and replaced with necessary information. 3. To date, the most widely used rewritable information recording carrier is the magnetic recording medium.

As a high-density magnetic recording method, it is known that a method in which recording magnetization of a magnetic recording medium is performed in the thickness direction of a magnetic recording film (hereinafter referred to as perpendicular magnetization recording) is excellent. This method has the advantage that the shorter the wavelength of magnetization, the smaller the self-demagnetizing field, so the recording density can be increased.

The magnetic recording medium used for perpendicular magnetization recording is one in which the axis of easy magnetization is aligned in the thickness direction of the magnetic recording film, and ring heads, unipolar heads, etc. are used for recording, initialization, and erasing. There is.

However, in (+λr) recording, the recording width is usually only about 15 μm at the narrowest, and there is a limit to increasing the recording density. If so, a small magnetic head would be required, and the bare body would have to run in close contact with the magnetic head for recording and reproduction, which would result in wear and tear on the surface of the body. A problem arises.

On the other hand, laser light recording is a high-density information recording method that has recently attracted attention.

Since laser light recording can use a waveform using the Kashica lens system, it is possible to obtain a higher recording density than magnetic recording.

Recording methods used in laser beam recording include thermal processing recording, state change recording, optical energy effect recording, and other methods.

Thermal processing recording is a method of recording optical signals by irradiating a recording medium with a laser beam and causing the irradiated portion to evaporate and decompose to form holes. Known recording media used in this method include, for example, low 1s (point metal, thermoglass nac, photoresist, etc.).

State change recording is achieved by heating with a laser beam.
Recording is performed by causing a local phase change or (τ [structural change) in the recording medium. For example, (Get '
l”e + Sb + S), (As, 're, I
), (As,',l”e,Se), (V,O,,P
), (Na, H, TiO), ('I”e, Ge),
(1'e.

sb ), (Te+Ge+Ag+Ga+Fe) 4%
The force anode of the tellurium low oxide TeOx (o<
<2) The low oxide thin film whose main component is irradiated with laser light induces thermal transformation, and at that time, the optical density (shade of color) changes, so there is no reflection of light between the irradiated area and the unirradiated area. The rates will be different. . Therefore, in this type of recording medium, recording and reproduction can be performed by changing the reflectance.
Recording is removed by utilizing the fact that the metal alloy thin film, which has a two-layer structure including a -Te alloy film and a heat absorption layer, changes from amorphous to crystalline when irradiated with laser light.

Magneto-optical effect recording involves locally irradiating laser light onto a magnetic recording medium whose Curie point temperature or magnetic compensation temperature is relatively low and whose axis of easy magnetization is oriented perpendicular to the film surface. , thermally inverting the magnetization direction ((thus recording is performed). In this case, the recording medium is MnA4Ge, MnB1.

Ferromagnetic thin films such as GdFe, TbFc, and G(ICO) are used.

However, since 7'z, these laser optical recording media have not been able to erase the recorded information], even if it is possible to erase the recorded information, the recording cycle of repeating writing, erasing and writing, It had the disadvantage of insufficient practicality. For example, thermal processing records are difficult to erase, and many state change records are difficult to replace because their state changes are completely reversible. Further, even with magneto-optical effect recording in which records can be erased, there is a problem in that the reproducibility of recording cycles gradually but gradually deteriorates.

Furthermore, conventional laser beam recording media have low sensitivity and j? Since the i-image resolution is not necessarily sufficient, even in terms of high-density recording, the performance required today cannot be fully satisfied.

For this reason, it has a recording margin higher than that of conventional laser beam recording media, and at least a part of the recorded information is stable with good reproducibility [7.1 Development of a replaceable information recording carrier] was desired.

[Purpose of the invention]

An object of the present invention is to provide an information record carrier in which at least a portion of information can be easily and stably replaced, and the recording density can be greatly increased. purpose.

[Summary of the invention]

In order to achieve the above object, the present inventors conducted 11 Eikura researches, and as a result, we developed a magnetic recording part that allows easy rewriting of information on an information recording carrier, and a laser beam recorder that allows high-density speed recording. The present invention has been achieved based on the discovery that by arranging both parts together, at least part of the information can be erased and the recording density can be greatly increased.

That is, the information recording carrier according to the invention is characterized in that a film of a magnetic recording medium and a film of a nonmagnetic optical recording medium are laminated on a nonmagnetic substrate.

The non-magnetic substrate used supports the film of a magnetic recording medium (hereinafter referred to as a magnetic recording film) and the film of a laser beam recording medium (hereinafter referred to as a laser beam recording medium), and facilitates the handling of these recording films. This is a necessary element for this purpose.

Examples of nonmagnetic substrates include polymeric materials such as acetate, phenol, epoxy, and polyide resins, glass, and S.
iO2 moy non-magnetic ceramic, A e + Zn +
A plate, disk, sheet or film of non-magnetic Venus 2, such as Cu, can be shot.

The surface of the substrate is usually processed to be smooth, and if necessary, grooves or the like are formed in several stages as tracking guides for laser beam recording.

In the present invention, the magnetic recording film is an area for recording, storing, reproducing, and converting magnetic information signals.

Magnetic recording media include Fe, Co', Ni, V, Cr.
+I'V1n+Cu.

zr, Nb+Mo, Tc+Rt+rRh
r I]d r Hf HTa +W+ Re r
A well-known ferromagnetic material containing at least one element of Os r I r can be obtained.

The axis of easy magnetization of a stiff ferromagnetic material is preferably oriented perpendicularly to the film surface of the magnetic recording film, and is usually oriented perpendicularly to the film surface of the magnetic recording film.
(The coercive force (Hc) in the vertical direction is 750 to 18,000e.
, the saturation magnetization is 5000 or more.

If the coercive force (fic) in the direction of superimposition on the film surface is less than 500 Oe, it is difficult to increase the recording density, and if it exceeds 180° Oe, the magnetic recording head will be saturated. On the other hand, if the saturation magnetization is less than 100 G, the reproduction output in the low range of the magnetic recording medium will decrease, which is not preferable.

In the present invention, the laser beam recording film is an area in which laser beam information is recorded and reproduced at high recording density.

The laser beam recording medium used is one on which information is recorded and stored independently of the magnetic recording medium. Therefore, the state of mutual information recording and storage must not be affected by saturation or the like. Therefore, the laser beam recording medium is required to be non-magnetic.

As the laser beam recording medium, a medium for state change recording is preferable.
1. It is preferable to use the change in reflectance caused by thermal transformation of the IA pure body. Therefore, recording media that utilize such changes in reflectance (hereinafter referred to as reflectance change recording media) require a smaller laser output for recording than thermal processing recording media. This is because it is necessary to use an air sandwich structure for river use, so it has the advantages of being able to reduce the thickness of the information recording carrier and having a high signal-to-noise ratio (S/N ratio) for recording reproduction. be.

As the reflectance change recording medium, Al, Si, P, S+
Zn.

Ga, Ge, Ae, Se, Cd, In, Sn, Sb, T
Examples include recording materials containing at least one element selected from the group of e, TA, Pb, Bi, and Po, and more specifically, (1) causing a phase transition from amorphous to crystalline. ,
An alloy film with a two-layer structure consisting of an Sb-Se alloy film and a Bi-Te alloy film (1) GeOx (o<
2), low oxide thin film (iiD (Te, Sb,) mainly composed of TCOX (o<X<2), etc.
Examples include chalcogenide thin films such as I (Te, Ge 2 ) + (Te+As+Ge 2 ).

The thickness of the Rede optical recording film is normal! '1on-' 3500 people r+ Film J'f is 500 without vortex 6-J: Sufficient contrast and strike cannot be obtained, film stability such as oxidation corrosion is reduced, and on the other hand, film thickness If it exceeds a5ooA, a significantly large amount of energy is required for recording, which is disadvantageous.

The information recording carrier of the present invention has a magnetic recording film and a laser beam recording film laminated on a non-14z group.

The layers are stacked in any order of wild pitch, magnetic recording film, and laser light recording, or substrate, laser light recording film, and magnetic recording film. In the former laminated structure, the laser beam recording film and the latter laminated structure, the magnetic recording film also serves as a peritoneal retention film for the @air recording film and the laser beam recording film, respectively.

The magnetic recording film can be formed by, for example, vapor deposition, sputtering, electrodeposition,
The laser beam recording film, which can be obtained by electroless plating or by a known method such as embroidery, can be, for example, m9Ff.
j, sputtering, moon' B E (molecular
arbeam) etc.

Next, an information recording carrier of the present invention and a method of using the same will be explained with reference to the drawings.

Figure 1 shows the information recording carrier used in the book, 1H report of FF12 record, F+F report record of arrest,
FIG. 3 is a conceptual diagram showing an example of the positional relationship between the optical head and the optical head.

In the figure, the unexploded H)J information i1<recording JU body 1a is conceptually shown in its cross section. This information record 411 body 1a
A nonmagnetic substrate 2, a nonmagnetic laser beam recording film 3, and magnetic recording layers 1 and 4 are laminated in this order.

In this case, the magnetic recording film 4 also serves as a protective film for the laser beam recording film 3. A laser beam recording film 3 is formed from a reflectance change recording medium and is irradiated with a laser beam 7 focused through an optical system (optical head) 8 provided on a substrate 2 transparent to the laser beam used. , the amorphous region 5 within the skin 3 undergoes a phase transition to a crystalline region 6 7, and recording is performed. Similar to recording, reproduction is performed using laser beam 7 that is converged through j1' and optical system (optical head) 8. In this case, a laser beam with a sufficiently lower energy intensity (output) than during recording is used.

On the other hand, in magnetic recording jj, g 4, silver i-ide is performed by passing electricity through a coil 10 and forming a perpendicular magnetization recording area 11 by a recording head (magnetic head) 9, and reproduction thereof is performed by a reproducing head (magnetic head). 32.

In FIG. 1, the optical system (optical head) 8 is placed on the side of the base material 2,
(This is an example in which the heads 9 and 12 are provided on the side of the magnetic recording film 4. However, it is also possible to provide both the optical system (optical head) 8 and the magnetic heads 9 and 120 on the side of the magnetic recording film 4. Possible. However, in this case, magnetic recording N4
The film thickness is sufficiently thin, the thermal conductivity is low, and it is transparent to laser beams for recording and reproduction, and the cue point temperature and magnetic compensation condition 1''i of the magnetic silver phosphide medium are close to the heat of the laser beam recording medium. The transition temperature must also be kept in check.

The 21st "?+" is a conceptual diagram showing an example of the positional relationship among the information recording carrier, the magnetic head, and the optical head when performing recording and reproduction using the information recording carrier according to another aspect of the present invention.

In the figure, the information recording device 1 of the present invention, whose cross section is shown as il for the sake of design, has a non-corrosive substrate 2, a magnetic recording film 4,
and a non-E4 +l: laser beam recording film 3 are laminated in this order and have a thickness of 1 h, and the laser beam recording film 3 also serves as a protection film for the magnetic recording film 4.

Optical head (optical system) 8 and magnetic heads 9 and 12
are both arranged on the side of the laser beam recording film 3.

Rade optical recording is performed by irradiating a laser beam 7 converged through an optical system (optical head) 8 onto a laser beam recording film 3 made of a reflectance change recording medium to induce a phase transition. Reproduction is performed by using a laser beam 7 with a lower energy intensity than that used during recording, and by detecting its reflectance. On the other hand, magnetic recording and reproduction are performed using a recording head (magnetic head) 9 and a reproducing head (as shown in h (a) in FIG. 1).
(magnetic head) 12.

As mentioned above, [How to use the information recording carrier shown on page 1]
In both cases, one set of magnetic head and optical head is used for one information recording body, but two or more information recording carriers are arranged side by side at a constant interval, and the head is inserted between the information recording carriers. However, by recording and reproducing, it is also possible to process a large amount of 1'W information at one time.

〔Effect of the invention〕

Since the magnetic recording film and the laser beam recording film are mutually layered on the substrate (*information record carrier is α) of the present invention, recording can be superimposed magnetically and optically. The recording density will be significantly higher than that of conventional optical recording or magnetic recording information recording carriers. ■ A film that can be replaced with a permanent recording film (usually a laser beam recording film) as necessary. (usually a magnetic recording film) during recording, it is possible to rewrite at least part of the information; ■ Between a magnetic recording film and a laser beam recording film:
Since one of the fz and fz acts as a protective film, it has the effect of extending the life of the other recording film, and its industrial value is extremely large.

[Embodiments of the invention]

Hereinafter, the information automation silver 1 basis weight of the present invention will be explained in detail with reference to Examples and Comparative Examples.

Example 1 and Ratio Example 1 First, the thickness 1. ] After applying an ultraviolet curable resin with a thickness of 0.05++ on a glass disk with a diameter of 1 ft and a diameter of 200 mm, apply a stanbar for creating tracking grooves to the cloth surface and apply ultraviolet rays from the glass surface. By irradiating the resin, the resin is made into 6 moles, and then the stamper is removed and the resin is made to a depth of 7 mm.
A spiral tracking groove with a diameter of 50λ and a width of 0.5 μm was formed.

Next, a 1000λ thick TeOx (X = 1
．． 1) A laser beam recording film made of a thin film was obtained.

Next, on the obtained TeOx thin film, a vacuum degree of 1.5×1
Sputtering was carried out using Co with a Cr content of about 18% by weight as a target at a pressure of 0-'torr, a pressure of 2×10 torr, a high-frequency power of 200 W, and a film thickness of about 1 μm.
Magnetic expansion force (He) in the art dealer direction on the m+M plane is about 15,000e.

A magnetic recording film made of Go-18Cr with a saturation magnetization (Ms) of 390G was formed to obtain an information recording carrier of the present invention.

On the other hand, for comparison, a comparative information recording carrier consisting of only a thin film of Te0)(' (x = 1.1) with a thickness of 1ooO'jL was prepared on a lath substrate with tracking grooves by the same method as above. I got it.

For the information recording carrier disks of the present invention and for comparison thus obtained, 4'N information recording, restraint and turning tests were conducted.

Laser light recording is performed by rotating the information recording carrier disk at 180° rp.
GaAl operated with output cuff mW while rotating at m
As semiconductor laser light (wavelength λ-8300λ) is converted to numerical aperture (
This was performed by converging with a lens of NA) 0.5 and irradiating the laser beam recording film through the glass substrate. Also,
At the same time, regarding the information recording carrier disk of the present invention, a magnetic head was provided on the magnetic recording film side, and magnetic recording was performed with a gap [1 part 1 μm]. Next, for the information recording carrier disk of the present invention, recorded information was generated using an optical head and a magnetic head, and for the comparative information recording disk, recorded information was generated using only the optical head. It was confirmed that information was recorded at a density approximately 1.7 times higher than that of the comparative version.

``Information to be permanently recorded will be recorded using an optical head, and information to be erased will be recorded using a magnetic head, respectively, on the laser beam recording layer and the magnetic recording film.''
11? Part of the information will be permanently recorded and the other part will be stored on i4F! a
I was able to change it.

Example 2 and Comparative Example 1 A magnetic recording film made of Co-18Cr having a crotch thickness of approximately 1 μm was formed by the same method as in Example 1 on a polyimide resin disk having a thickness of 50 μm and a diameter of 2001i+Ilφ.

Next, on this magnetic recording film, a part of GeO2 is deposited through the air without ring formation, and GeoX (x=1
．． 2) The information recording medium of the present invention was obtained by forming a corrugated laser beam recording film.

On the other hand, for comparison, GeO
A comparative information recording carrier consisting of a thin film with x = 1.2) was obtained.

Information recording, reproduction, and )lJ switching tests were conducted in the same manner as in Example 1 on the information recording phase flexible disks of the present invention and comparative information recording disks thus obtained. As a result, it was confirmed that the information recording material of the present invention had a recording density 1.6 times higher than that of the information recording material for hino-aguri.

Unfortunately, the magnetic recording part can be erased and rewritten by a magnetic head, and the magnetic recording film has a life span of 2.4 times j+, R due to the protective effect of the laser beam recording film.

Example 3 and Comparative Example 3 μ2 1. L
Ojorrx argon positive 2.2 x 10-2torr
, high frequency power 650W, substrate temperature 1250℃, using Mo-Fe-Ni alloy as the target, about 20
Sputtering was performed for 1 minute, and the film thickness was 1/'rn%4A1) (force (He) 50e, saturation magnetization (Ms) approximately 6000
Eight of e = io -Fe -Ni (Fe 27% by weight
An alloy layer of 70% by weight of Ni was provided. Next, on this MO--Fe--Ni alloy layer, a magnetic recording film made of Co-18Cr of 111%9 about 1 μm was formed by the same method as in Example 1.

Next, this A18, 5 with a film thickness of 670 on the air record rise.
b2-Se3 alloy (Sb 60mff156,
Se 40ii1% )'lx) IIM film thickness 250
-Teae alloy (Bi45ifi, T
A laser beam recording film was formed by depositing a thin film of e55r and 4H in this j-order to obtain a +I'f recording base 4H body of the present invention.

On the other hand, the same method as above was applied to the tracking grooved glass disk for comparison /ζ.
, and 1Sb-Se alloy im and Sb-Te system association Kanazawa 1.11>! A comparative silver support was obtained.

Regarding the information recording button discs of the present invention and comparative information recording discs thus obtained, information recording, reproduction and ':S
When an @ exchange test was carried out, the recording density of the 41 yen information record carrier of the present invention was twice as large as that of the comparative one.

Erasing and replacement are possible using a lathe, a magnetic recording part, and a magnetic head, and the life of the magnetic recording film has been increased by 1.8 times due to the protective effect of the laser light recording film.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show the results of the invention.
An example of the position of the 4n information record carrier, magnetic head (recording head and reproducing head), and optical head (optical system) for recording and reproducing information using one recording device. FIG. la Tsutomu and 1b-information recording Jt1 body, 2... base material, 3
...Laser beam recording film, 4...Magnetic old; J +1'
; ...Coil, 11...
Perpendicular magnetization recording area, 12... reproducing head (magnetic head)
.

Claims (1)

[Claims] 1. An information recording carrier characterized in that a film of a magnetic recording medium and a film of a nonmagnetic laser beam recording medium are laminated on a nonmagnetic substrate. 2. The information recording medium according to claim 1, wherein recording and reproduction by a laser beam recording medium is performed by utilizing changes in reflectance accompanying thermal transformation of the medium. 3. The laser beam recording medium is made of Al, 5ijP, S+Zn
, Ga. Ce, As, Se, Cd, In, Sn, Sb, Te, T
The information/information recording carrier according to claim 1 or claim 2, which contains at least one element selected from the group consisting of 1, Pb, Bi, and Po.