JPH04177628A - Chip memory - Google Patents

Abstract

PURPOSE:To obtain a number of recording medium chips from one memory plate and facilitate the mass-production of a large number of chip memories in order to manufacture the chip-type optical information recording media for recording and reproducing information optically by a method wherein the chip is buried in a protective substrate. CONSTITUTION:A recording layer 5 made of inorganic recording material for reproducing only is formed on one side of a recording layer forming substrate 4 in which recorded information for reproducing only such as bits are recorded to form a recording layer substrate 6. Then the recording layer 5 side is covered with a protective layer 7 to compose a recording medium 1. In this composition, in order to make the handling of the recording medium chip 1 easy, the chip 1 is buried in a protective substrate 22 to obtain a required chip memory 21. As the material for the protective substrate, any of glass, ceramics, metal, synthetic paper, plastic film and woven cloth may be employed. With this constitution, a number of recording media chips can be manufactured in one film forming process.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a chip-shaped optical information recording medium (chip memory) that optically records and reproduces information using a light beam.
Regarding.

(b) Prior Art In recent years, it has become easier to record and reproduce information using optical information recording media, such as optical discs and compact discs (CDs).

For optical information recording, laser light is applied to the recording layer on the substrate at a wavelength of approximately
By irradiating the recording film with condensed light below a certain level, the shape change due to heat (
This is a method of recording by causing a change in the crystal state due to light (heat mode type) or a change in the crystal state due to light (photon mode type).
CDs (compact discs) are read-only, and D RAW (direct read) is a write-once recording medium.
(after write), rewritable magneto-optical disks, and the like are known.

The recording layer used in the heat mode information recording material includes metal thin films such as tellurium and hismuth, organic thin films such as cyanine dyes and natutalonanine dyes, and tellurium oxide films that utilize phase transition. These information recording materials are so-called DR materials that do not require any development treatment after information is written, and can be "directly read after writing."
Since it is an AW medium, high-density recording is possible, and additional writing is possible, it is expected to be used as an information recording material for disks or cards.

BACKGROUND ART Currently, an advanced information society is in progress, and the quantity and quality of information are expanding, and high-density, large-capacity information recording media, such as optical disks, are being developed.

These have a much larger recording capacity; for example, a 5-inch magneto-optical disk has a capacity of 500 MB (double-sided recording).
In addition, 12-inch recording media of approximately 2.1 gigabytes or more have been developed.

(c) Problems to be Solved by the Invention However, the recording capacity of these optical information recording media is extremely large, and the information recording capacity of a 5.25-inch optical disc is, for example, 540 megabytes. To explain the capacity of this recording medium using books and dictionaries currently on the market as an example, the recording capacity of V Kojien J is equivalent to about 30 books. The fact that the information equivalent to 30 volumes of ``Kojien'' can be recorded on a single optical disk with a recording capacity of 540 megabytes means that 540 mechabytes is too large for an individual to handle on a daily basis.

The recording layer of information media such as newspapers, many general books, and paperbacks that individuals often come into contact with on a daily basis is approximately several megabytes or tens of megabytes or less, and each of these is recorded on a separate optical disk. If an optical disk were to be made into a commercial product, it would be extremely large in terms of capacity and shape, and as an information medium used by individuals on a daily basis, it would have to be an expensive information medium. There's only one.

The present invention is an attempt to solve the problems associated with these conventional techniques.In particular, the amount of recorded information (on the order of several megabytes) of newspapers, general books, paperbacks, etc., which are everyday and personal information sources, is an object of the present invention. ) The object of the present invention is to provide an extremely small chip-shaped optical information recording medium that can record information such as:

(d) Means for Solving the Problems Thus, according to the present invention, a recording medium chip formed by cutting a recording medium having a recording layer on a substrate that can be recorded and reproduced by a light beam is embedded in a holding base material. A chip memory is provided comprising:

The chip memory of the present invention solves the above-mentioned problems, and in manufacturing thereof, a recording material is coated on a substrate by various coating methods such as a spin code method and a vacuum evaporation method, and then the substrate is cut. By,
- It is possible to use a mass production method that can produce a large number of recording medium chips for multiple film forming processes;
Cost reduction is possible.

The optical information recording medium of the present invention may be provided with a protective layer or a protective substrate on the recording layer for protecting the recording layer. Such a protective layer or protective substrate may be provided directly on the recording layer or may be provided via an air layer, and their specific structures will be shown in the specific examples and examples below. It can be done.

Further, the recording layer may not only be made of the various optical recording materials described above, but may also have a light reflecting layer (for example, metal vapor deposited) on the input surface of the light beam.

Further, the optical information recording medium of the present invention has a configuration in which the above-mentioned recording medium chip is embedded in a suitable holding base material, so that it is extremely convenient to handle.

The size of such a recording medium chip is determined by the intended recording capacity, but from the purpose of the present invention, it is determined by taking into account the recording capacity of newspapers, general books, paperback books, etc. This point will be explained in detail below.

First, a rough estimate of the storage capacity of newspapers, general books, paperback books, etc. will be explained.

[Estimation of newspaper storage capacity] (a) The size of one page of most newspapers is 51c x
It is 38cm, and this one page has a maximum of approximately 17,000
Characters can be recorded.

(b) The number of pages in a newspaper differs depending on whether it is a morning or evening paper, a newspaper, a trade paper, etc., but one copy is approximately 36 pages or less. The number of pages in the morning paper on a given day is shown below.

◆24 pages (Sankei, Denpa, Nippon Kogyo), ◆28 pages (Asahi, Mainichi, Yomiuri), ◆32 pages (Nikkei Sangyo, Nikkan Kogyo), ◆36 pages (
(Nikkei) (c) Lf If we calculate the vane number of one copy of a newspaper as 36 pages or less, the information recording capacity (number of characters) written in one copy of a newspaper is approximately 610,000 characters or less, and approximately 1
With a storage capacity of 2 megabytes, it would be possible to record characters equivalent to one newspaper (one character is calculated as 2 bytes).

(d) Also, since newspapers publish images such as photographs, extra information storage capacity is required, but by using techniques such as image compression, the storage capacity can be increased to several megabytes. If there is, it will be possible to record the outline of a general newspaper.

(e) Also, ``As a concrete indication of the recording medium, 1 gigahit is equivalent to 4000 beno newspapers (Nikkei Sangyo, 1
(July 6, 989), approximately 36 pages is approximately 1.1 megabytes.

(b) Approximate recording capacity of general books (a) The storage capacity of general books is 32 in 85 edition size.
4-page book (Applications of new photofunctional polymers, 1988
Calculated using 1.
The results are shown below.

(b) 43 characters can be written on one line and 32 lines can be written on one page, and one book of 20 books is 324 benos, so when calculating the recording amount in terms of characters, the recording capacity of one book is approximately 0.9 megabytes. become.

[Approximate storage capacity of paperback books] (a) The number of characters written on one page is approximately 500.1
If we calculate that a book has 270 pages, one book is approximately 063 megabytes.

Therefore, in order to record newspapers, general books, paperbacks, etc., which are examples of the needs of the present invention, optical information recording requires a recording capacity of several megabytes or tens of megabytes, even if photographs, diagrams, etc. are taken into account. It would be good if the medium could be produced. In addition, with a recording capacity of 1 megabyte, it is possible to record an amount equivalent to 250 benes of blank paper, assuming that the recording capacity of one page is 2000 characters, and it is suitable for personal use as a recording medium. Media with a capacity of about 1 megabyte are very easy to use.

[Recording Density] Optical recording can focus laser light to about 1 μm2 or less, so the recording density of bits is approximately 50 million pits/c.
m” or more (TEC[INILOGY AND MARK
ET, April 1989), which, expressed in bytes, is more than 6.25 megabytes/am''.

From this point of view, the size (cutting size) of the recording medium chip in the present invention is suitably a card shape of several xi to several tens of square meters or a disk shape of several square to several tens of square meters, particularly five to several tens of square meters. It is preferable to have a shape of 2511 squares or a diameter of 5 to 25 ii. Further, as for the data recording method, it is desirable to record data on a spiral track at a constant speed. This is because during recording and reproduction, drive systems such as pickups and memory media can be moved smoothly, allowing high-speed access and high-speed data transfer.

The optical information recording medium of the present invention comprising a chip of such size is light, thin, compact and low cost;
It is extremely suitable for recording and reproducing the contents of newspapers, books, paperbacks, etc.

Hereinafter, the configuration and manufacturing method of the present invention will be specifically explained by dividing it into a read-only type, a write-once type, and a rewritable type, with reference to the accompanying drawings.

Structure> FIG. 1 is a sectional view showing an example of a read-only chip memory 21 of the present invention. In FIG. 1, the recording medium chip 1 of the present invention has a recording layer 5 made of a read-only type inorganic recording material formed on a recording layer substrate 4 on which read-only recorded information (pits) and the like are recorded. The obtained recording layer substrate 6 was coated with a protective layer 7 and formed into chips (15x15zx: recording capacity (
The chip memory 21 is embedded in the holding base material 22 to make the recording medium chip 1 easier to handle.

FIG. 2(1) is a sectional view showing an example of the write-once recording medium chip 1 of the present invention. In FIG. 2 (1), the recording medium chip I of the present invention has a recording layer substrate 4 on which grooves for laser beam tracking and the like are formed on a substrate 3 using an ultraviolet facilitation resin 2. An adhesive layer 8 is formed on a recording layer substrate 6 prepared by forming a recording layer 5 made of an inorganic recording material or an organic recording material, and a protective substrate 9 is bonded to the chip (15Xt5++). 1o is
It is provided between the recording layer 5 and the protective substrate 9 (0, 1ix). Further, a metal reflective film (not shown) may be provided between the recording layer 5 and the air layer 10, if necessary. Mako, 2nd
FIG. (2) is a cross-sectional view showing an example of the chip memory 21 of the present invention. In FIG. 2(2), a chip memory 21 of the present invention is embedded in a holding base material 22 to facilitate handling of the recording medium chip 1 shown in FIG. 2(1). These are these.

FIG. 3 is a sectional view showing an example of the rewritable chip memory 21 of the present invention. In FIG. 3, the recording medium chip l of the present invention is manufactured by forming a recording layer 5 made of a rewritable inorganic recording material or an organic recording material on a recording layer substrate 4 provided with tracking grooves, etc. Recording layer substrate 6
Then, a protective layer 7 is coated and the chip is made into a chip.In order to facilitate the handling of the recording medium chip I, it is embedded in a holding base material 22 to produce a chip memory 21. Alternatively, a metal reflective film (not shown) may be provided between the recording layer 5 and the protective layer 7, if necessary.

FIG. 4 shows an example of an assembly (memory plate 15) of recording medium chips of the present invention.

As shown in FIG. 4, the recording medium chip 1 is produced by cutting an assembly (memory plate 15) of a large number of recording medium chips 1 that are simultaneously formed and sealed.

FIG. 5 shows an example of the chip memory of the present invention. To facilitate handling of the recording medium chip,
The chip memory 21 shown in FIG. 5 is manufactured by fixing on the holding base material 22 by adhesion or embedding.

<Manufacturing process> The manufacturing process of the chip memory of the present invention can be roughly divided into five stages. That is, (a) base fabrication process, (b) film formation process, (c) soil installation process, (d) chip formation process, (e)
This is a fixation step. Each step will be explained below.

(a) A metal stamper (not shown) on which grooves for laser beam tracking, recording information such as format information, etc. are formed is prepared. The recording layer substrate 4 is prepared by transferring the recorded information of a fine pattern from the metal stamper to the substrate 3 using an ultraviolet curing resin 2, or by transferring the recorded information etc. from the metal stamper using a high-precision injection molding method or the like. In the substrate manufacturing process, the recording layer substrate 4 is manufactured by transferring the .

At this time, a pattern such as a single cutting line or a mark may be transferred to facilitate cutting in the chip forming process described later.

(b) The process of coating the recording film 5 on the recording layer substrate 4 is a film forming process. The method of forming the recording film 5 can be divided into a wet process and a drive process, and a solution coating method (
Various methods have been developed, such as spin coating method), vacuum evaporation method, sputtering method, plasma polymerization method, and LB method. Various film forming methods are used depending on the recording/reproducing method (read-only type, write-once type, rewritable type) and the characteristics of the recording material. For example, a spin coating method is an example of a film forming process when an organic dye is used for a recording film. In the spin coating method, a chromogen is dissolved in a predetermined solvent to a predetermined concentration, and then the solution is filtered to obtain a coating stock solution. Set the recording layer substrate described above on the spinner,
After dropping the stock solution, it is shaken off by high-speed rotation, and the remaining solvent is removed by heating or the like to produce the recording layer substrate 6.

(c) In the case of the invention shown in FIG. 2(1), the recording layer substrate 6 is sealed with a protective substrate 9 after forming the adhesive layer 8, as shown in FIG. 1 or 3. In the case of the invention shown in , the soil-laying process is to manufacture the memory plate 15 by coating the protective layer 7 made of synthetic resin.

(d) The memory plate 15 is cut into polygonal shapes such as squares and rectangles, circles, and ellipses by a mechanical method such as dicing with a blade, or a thermal method using a carbon dioxide laser, etc., and records are recorded. This is the process of producing the medium chip 1 or the process of forming a chip. By adding this chip forming step, a large number of recording medium chips 1 can be manufactured from the memory plate 15 at one time.

(e) In order to facilitate the handling of this recording medium chip l, it is fixed to the holding base material 22 by adhesion or embedding, and the chip memory (optical card or optical disc) 2
1 is produced in the immobilization step.

Note that the chip manufacturing process is performed in a clean space.

Recording Layer Substrate and Protection Substrate> The recording layer protection substrate used in the present invention is particularly suitable as long as the side into which the laser beam is input, that is, the side of the laser light source for recording and reproduction, is light-transmissive. A wide range of materials can be used without limitation. For example, you can specifically use the following: Glass, plastic, and ceramic can be used as substrate materials. Plastics include polyvinyl chloride, polyethylene,
Polypropylene, polystyrene, phenolic resin, unsaturated polyester, ABS grain, AESlt, ll,
AA, S resin, Astetll#, ACS resin, ionomer resin, epoxy resin, polyacetal resin,
Polyamide (nylon resin), polycarbonate, polyethylene terephthalate, polymethyl methacrylate,
Polybutylene terephthalate, polyphenylene sulfide, polysulfone, etc. are used, but glass, polycarbonate, polymethyl methacrylate, polyolefin, etc. are particularly preferred from the viewpoint of productivity and prior permeability.

<Protective layer> A wide variety of materials can be used for the protective layer used in the present invention, as long as the material protects the recording layer without damaging it. For example, polyvinyl chloride, polyethylene, polypropylene, polystyrene, phenolic resin, unsaturated polyester, ABS resin, ABS resin, AAS resin, AS resin, AC3 resin, ionomer resin, epoxy resin, polyacetal resin, polyamide (nylon resin), polycarbonate , polyethylene terephthalate, polymethyl methacrylate, polybutylene terephthalate, polyphenylene sulfide, polysulfone, etc. are used, but from the viewpoint of productivity and long-term reliability, polycarbonate, polymethyl methacrylate, polyolefin, etc. are particularly preferred.

<Reproduction-only type inorganic optical recording material> The reproduction-only type inorganic optical recording material is a metal with high reflectance, such as AI, AuSAg, Zn, or Cd.

It is preferable to use a reflective metal thin film made of a single metal such as Sn, SbsTe5Pb, or Bi or an alloy of two or more metals. Such a reflective metal thin film layer may be formed by a conventionally known method such as a sputtering method, a vacuum evaporation method, an ion blating method, or an electroplating method. The thickness of this reflective metal thin film layer is 200 to 1
000 people is preferable.

<Write-once type inorganic optical recording material> When writing by irradiation with an energy beam, write-once type inorganic optical recording materials are made of low melting point metals such as Te, Zn, and Pb.
SCd, Bi, Sn, Se, In.

It is preferable to use a reflective metal thin film containing a metal such as Ga or Rh as the main component, especially Te-5e or T-5e.
e-5e-Pb, Te-Pb, Te-5n-S, 5n
-CuSTe-Cu, Te-Cu-Pb and other alloys are preferred. Such a reflective metal H film layer may be formed by a conventionally known method such as a sputtering method, a vacuum evaporation method, an ion blating method, or an electroplating method. The thickness of this reflective metal thin film layer is preferably from 20 mm to 1000 mm. In some cases, a multilayer film made of the above-mentioned metals, such as a multilayer film of an In film and a Tel film, is also used.

Write-once type organic optical recording material〉 Write-once type organic optical recording material is a dye that has an absorption wavelength that corresponds to the wavelength of the laser beam, and can record information by forming pits with the thermal energy of the laser beam. It is the material. There are near-infrared absorption dyes corresponding to the wavelength of near-infrared lasers, and visible light absorption dyes corresponding to visible light lasers.

Examples of near-infrared absorbing dyes include polymethine dyes (
near-infrared absorbing dyes such as noanine dyes), squarylium dyes, thiol nickel complex salts, phthalocyanine dyes, natutalone dyes, triallylmethane dyes, immonium, diimmonium dyes, naphthoquinone dyes, anthraquinone dyes, etc. Pigments are used as write-once recording materials in which pits are formed by reactions such as melting and sublimation of the organic material in the thin film layer by heat energy from, for example, a near-infrared semiconductor laser beam.

Such an organic thin film layer may be formed by a conventionally known method such as a solution coating method, a vacuum evaporation method, a sputtering method, or a plasma polymerization method. Furthermore, in order to enhance the reflection of the laser beam used when reproducing recorded information, a light reflecting layer made of a metal thin film may be provided under the organic thin film layer.

Metal @ Thin Film Light Reflective Layer> As a reflective layer for the laser beam, a metal with high reflectance, such as Al, Au, Ag, Zn, Cd, and S is used. ,Sb,T
It is preferable to use a reflective metal thin film made of a single metal such as e%Pb or Bi or an alloy of 2FJt or higher metals. Such a reflective metal thin film layer may be formed by a conventionally known method such as a sputtering method, a vacuum evaporation method, an ion blating method, or an electroplating method.

Rewritable inorganic optical recording material (magneto-optical)> A rewritable inorganic optical recording material (magneto-optical) is a material that can record and/or rewrite information using a magnetic material such as TbFe. Magneto-optical recording involves irradiating the recording material with laser beam energy and applying a magnetic field at the same time to reverse the magnetization of the thin metal film, resulting in effects such as the Kerr effect and Faraday effect, in which the linearly polarized light rotates depending on the direction of magnetization. This is a method of recording, reproducing, and rewriting information by detecting the direction of magnetization.

TbFe, TbCo, GdCo, GdFe, DyFe5
TbFeCo, TbDyF eS GdTbFe, G
dFeB1. DyFeCo, NdFeCo, MnCuB
1, GdTbFeCo, GdTbFeGe1 GdDy
A thin film made of an alloy of magnetic materials such as FeCo, NdDyFeCo, and NdTbFeCo is preferred. Such a metal thin film layer may be formed by a conventionally known method such as a sputtering method, a vacuum evaporation method, an ion blating method, or an electroplating method. Further, a dielectric transparent protective film may be provided as a protective layer above and below the magneto-optical recording layer. This protective film was made of TEHA, SiN, AIN%SiAl.

A dielectric material such as N is used.

<Rewritable inorganic optical recording material (phase change)> In rewritable inorganic optical recording material (phase change), a phase transition occurs due to differences in the energy irradiation amount of the laser beam, and the reflectance or transmittance changes. It is an inorganic material with reversibility. As a phase change material, 5nTeSe
, Ge5bTe, Ge5bTb, In5eTl, In5
eTa1SbTeSe, TeGe5nAuSGeSbT
e-Co, GeSbTe-AgT1, etc. are used.

Rewritable organic optical recording materials> Photon mode materials are mainly used as rewritable organic optical recording materials. Examples of rewritable organic optical recording materials include (a) ring-opening reaction (recording material example: spiropyran), (b) ring-closing reaction (recording material example: fulgide), and (c) cis - trans isomerization reaction (recording material example: azobenzene), (d) tautomerization reaction by hydrogen transfer (recording material example: salicylideneaniline), (
e) Free radical generation reaction by dissociation reaction (example of recording material:
β-tetrachloro-1-ketodihydronaphthalene), (
f) Photooxidation-reduction reaction (example of recording material: tetrabenzopentacene), etc., and the materials shown in each classification example are used.

Holding base material> Materials for the holding base include glass, ceramic, metal,
Any material that can be used as a normal card substrate such as synthetic paper, paper, plastic film, woven fabric, non-woven fabric can be used, but from the viewpoint of productivity and smoothness, glass and plastic film are preferable. Plastic films include polyvinyl chloride, polyethylene, polypropylene, polystyrene, phenolic resin, unsaturated polyester, ABS resin, AES resin, AAS resin, A
S resin, ACS resin, ionomer resin, Epoquin resin, polyacetal resin, polyamide (nylon resin),
Polycarbonate, polyethylene terephthalate, polymethyl methacrylate, polybutylene terephthalate,
Polyphenylene sulfide, polysulfone, cellulose derivatives, polyester resin, polyimide resin, acrylic resin, polyether resin, polysulfone resin,
Vinyl chloride/vinyl acetate copolymer, polyvinylidene chloride, polyvinyl butyral, etc. can be used, but
From the viewpoint of dimensional stability and smoothness, cellulose triacetate, polyethylene terephthalate, polyimide, polycarbonate, polymethyl methacrylate, polyolefin and the like are particularly preferred.

In some cases, metal notes such as iron, stainless steel, aluminum, tin, copper, and zinc may also be used.

Next, a method for manufacturing a chip memory (optical card, optical disk) of the present invention fixed to a holding base material will be explained.

First, using a holding base material such as polyethylene terephthalate or white hard vinyl chloride, heat press a concave part in which to embed a recording medium chip in a circular, square, or rectangular shape onto a card or disk-shaped holding base material. If necessary, the surface of the card or disc-shaped holding base material, including these four parts, is treated with an adhesive primer. Next, as described above, the recording medium chip is cut into a rectangular, circular, oval, etc. shape of several mm to several cm by a mechanical method or a thermal method such as a laser. Then, the chip memory of the present invention is completed by fitting and fixing it into the four parts of the holding base material.

Also, at this time, a transparent polycarbonate film (not shown) or the like provided with a thermal adhesive layer on one side, for example, is superimposed on the recording medium chip, and the film is pressed with a heat fixing roll heated to about 90 to 150 degrees Celsius. In this way, the desired chip memory may be manufactured.

Next, FIG. 6 shows information on writing information to the recording layer (write-once type, rewritable type) and reading out the written information (read-only type, write-once type, rewritable type) produced as described above. An outline of the recording/reproducing system will be shown and explained.

In the case of the write-once type, information is written to the recording layer of the write-once type using a wavelength of 3° Onm.
After condensing an energy beam such as a laser beam of ~1l100n with a lens or the like, the recording layer is irradiated to evaporate and evaporate the metal or organic material in the irradiated area.
This is done by forming recording bits by scattering or unevenly distributing them. At this time, the intensity of the energy beam is O, l
mW~100mW.

The pulse width is 5nsec to 500m5ec, and the beam diameter is
It is preferable that it is 0.5 micrometer - 50 micrometers.

As the energy beam irradiated onto the recording layer, a semiconductor laser, an argon laser, a helium-neon laser, or the like is used.

In the case of information writing/rewriting type>Writing information to the rewritable type recording layer requires a wavelength of 300 nm to 1 lo
By focusing an energy beam such as an on m laser beam with a lens or the like and then irradiating it onto the recording layer, in the case of inorganic recording materials, by changing the magnetization direction and crystal structure of the metal material in the irradiated area, In the case of organic recording materials, this is done by changing the absorption spectrum of the organic recording material through various photon mode reactions. At this time, the intensity of the energy beam is 0.1 mW ~ 1
00 mW, pulse width is 5nsec~500m5e
c. The beam diameter is preferably 0.5 μm to 50 μm.

As the energy beam irradiated onto the recording layer, a semiconductor laser, an argon laser, a helium-neon laser, or the like is used.

Reading out information - Reading out information written on the optical information recording medium invented by Rikiki can be carried out to the extent that the material or condition of the recording layer is not changed.
For example, after condensing a low-energy beam, white light, tungsten light, etc. that does not cause melting or structural changes through a lens, recording is performed from the recording layer substrate side or the protective layer (protective substrate) side. This is done by irradiating the layer and detecting the intensity, phase change, etc. of the reflected light.

(E) Effect The chip memory of the present invention can produce a large number of recording medium chips in - times of film forming process by adding a chip forming process to the manufacturing process, and has the following effects. .

(a) A large number of small-sized recording medium chips having the same shape can be manufactured at the same time, and a low-cost chip memory can be provided with a wallet.

(b) By applying a high-density recording/reproducing method using a laser, newspapers, books, paperbacks, etc. can be recorded and reproduced in a small recording medium chip, and the recording capacity can be adjusted.

(f) Examples The present invention will be explained below using Examples, but the present invention is not limited to these Examples.

<Example 1 Example using a read-only inorganic recording material> (a) A metal stamper was prepared to form read-only recorded information, grooves (width 0.8 μm) for laser beam tracking, etc. . Using this metal standber, a substrate for a recording layer was prepared by transferring recorded information of a fine pattern to an acrylate-based ultraviolet curing resin on a glass substrate. Another method is to transfer recorded information from a metal standby by integral molding using high-precision injection molding of polycarbonate.
A substrate for a recording layer of 1.0 mm in diameter could be produced.

(b) Next, using a vacuum evaporation device, 4002 to 6
A recording layer made of a reflective metal thin film of aluminum having a thickness of 0x was formed on a recording layer substrate to produce a recording layer substrate.

(c) This recording layer substrate was coated with a plastic protective layer (polycarbonate) of about 10 μm to prepare a memory plate.

(cl) The memory plate was cut into squares using a mechanical method (dicing) using a blade to produce a large number of recording medium chips ((5×15 mm)).

(e) To facilitate handling of this chip, a fifth
As shown in the figure, a read-only chip memory was fabricated by fixing it to a holding base material (made of plastic) by embedding.

Alternatively, instead of coating the recording layer substrate with a protective layer, the recording layer substrate can be formed by adding an adhesive to form an adhesive layer, sealing the recording layer substrate with a protective substrate, producing a memory plate, and then cutting it. A read-only recording medium chip as shown in FIG. 7 was manufactured.

<Example 2 Example using write-once type inorganic recording material> (2L
) A metal stubber similar to the above was prepared in which grooves for laser beam tracking and recording information such as format information were formed. A substrate for a recording layer was prepared by transferring recorded information in a fine pattern from a metal stand to a glass substrate using an acrylate-based ultraviolet curable resin. As another method, a substrate for a recording layer with a thickness of 1 to 2 mm could be produced by integrally molding polycarbonate by high-precision injection molding and transferring recording information etc. from a metal stand.

(b) Next, by reactive sputtering of Te using methane (CH,) gas in Ar gas, 30
A recording layer substrate was produced by forming a metal thin film (recording film) of Te-C having a thickness of 0 to 600 mm on the recording layer substrate.

(c) A memory plate was produced by adding an adhesive to this recording layer substrate to form an adhesive layer and sealing it with a protective substrate.

(d) The memory plate was cut into squares by a mechanical method (dicing) using a blade to produce a large number of recording medium chips (15 x 15 mm).

(e) In order to facilitate the handling of this chip, it was fixed to a holding base (made of plastic) by embedding, and a chip memory using a write-once type inorganic recording material similar to that shown in FIG. 5 was fabricated.

<Example 3 Example using write-once type organic recording material> (λ)
A metal stamper similar to that described above was prepared in which grooves for laser beam tracking and recording information such as format information were formed. A substrate for a recording layer was prepared by transferring recorded information in a fine pattern from a metal stamper to a glass substrate using an acrylate-based ultraviolet curable resin.

As another method, a substrate for a recording layer with a thickness of 1 to 2 mm could be produced by integrally molding polycarbonate by high-precision injection molding and transferring recording information etc. from a metal stamper.

(b) Next, after dissolving a cyanine dye, which is a near-infrared absorbing dye with a reflectance of 20 to 50%, in a methanol solvent, the solution is filtered and used as a coating stock solution. The recording layer substrate described above was set on a spinner, and after dropping the stock solution, it was spun off at high speed, and the surface was dried to form a recording layer having a film thickness of approximately 700 mm.

Furthermore, when a phthalonoamine dye was used as the near-infrared absorbing dye, film formation was possible even when a vapor deposition apparatus was used at a vacuum level of about 1 O-5 Torr.

(c) A memory plate is produced by adding an adhesive to this recording layer substrate to form an adhesive layer and sealing it with a protective substrate.

(d) The memory plate was cut into squares by a mechanical method (dicing) using a blade, and a large number of recording medium chips (15 x 15 mm) were produced.

(e) To facilitate the handling of this chip, it was fixed to a holding base material (made of plastic) by embedding, and a chip memory using a write-once type organic recording material similar to that shown in FIG. 5 was fabricated.

<Example 4 Example using a rewritable inorganic recording material (magneto-optical)> (a) A metal stamper similar to the above was prepared with grooves for laser beam tracking, recording information such as format information, etc. D. A substrate for a recording layer was prepared by transferring recorded information in a fine pattern from a metal stamper to a glass substrate using an acrylate-based ultraviolet curable resin. Alternatively, a recording layer substrate with a thickness of L2 mm can be produced by integrally molding polycarbonate using a high-precision injection molding method and transferring recorded information from a metal stamper.

(b) Next, using a sputtering device, first a dielectric protective film made of SiN is laminated, and then a recording layer made of a magnetic thin film made of TbFeCo with a thickness of about 100 mm is formed,
A dielectric protective film made of SiN was laminated again. Note that if an aluminum reflective film is added after this, the sensitivity will improve, so the TbFeCo magnetic film should be added at 200A to 30A.
0. I was able to make it as thin as A.

(c) This recording layer substrate was coated with a plastic protective layer (paint) of about 10 μm to produce a memory plate.

(d) The memory plate was cut into squares by a thermal method using a carbon dioxide laser to produce a large number of recording medium chips (15×15 mm).

(e) To facilitate handling of this chip, it is fixed to a holding base material (made of plastic) by embedding and the fifth
A chip memory using a rewritable inorganic recording material (magneto-optical) similar to the one shown in the figure was fabricated.

<Example fPI5: Example using rewritable inorganic recording material (phase change)> (a) A metal stamper similar to the above was prepared in which grooves for laser beam tracking, recording information such as format information, etc. were formed. A substrate for a recording layer was prepared by transferring recorded information in a fine pattern from a metal stamper to a glass substrate using an acrylate-based ultraviolet curable resin. Alternatively, a recording layer substrate with a thickness of 1.2 mm could be produced by integrally molding polycarbonate using a high-precision injection molding method and transferring recorded information from a metal stamper.

(b) Next, using a sputtering device, a thickness of 15
0000 SiN dielectric protective film is laminated, and then about 2
A recording layer was formed using a metal thin film of Ge5bTe with a thickness of approximately 120 nm, and a dielectric protective film of SiN with a thickness of approximately 120 nm was laminated again. Note that after this, the thickness will be approximately 500 mm.
A reflective film made of human gold was laminated to form a recording layer substrate.

(c) This recording layer substrate was coated with a plastic protective layer (paint) of approximately 10 μm to produce a memory plate.

(d) The memory plate was cut into squares by a thermal method using a carbon dioxide laser to produce a large number of recording medium chips (15×15 mm).

(e) To facilitate handling of this chip, it is fixed to a holding base material (made of plastic) by embedding and the fifth
A chip memory using a rewritable inorganic recording material (phase change) similar to the one shown in the figure was fabricated.

<Example 6 Example using rewritable organic material> (a)
A metal stamper similar to the one described above was prepared in which grooves for laser beam tracking, recording information such as format information, etc. were formed. A substrate for a recording layer was prepared by transferring recorded information in a fine pattern from a metal stamper to a glass substrate using an acrylate-based ultraviolet curable resin.

Alternatively, a substrate for a recording layer with a thickness of 1.2 mm could be produced by transferring recording information and the like from a metal stamp I by monolithically molding polycarbonate using a high-precision injection molding method.

(b) Next, spiropyran dye, which is an organic photochromic material, was dissolved in a solvent mixed with a vinyl chloride polymer, and the solution was filtered to obtain a coating stock solution. The recording layer substrate described above was set on a spinner, and after dropping the stock solution, it was spun off at high speed. The surface was dried to form a recording layer with a thickness of about 0.7 μm. Then, as a reflective layer,
A recording layer substrate was prepared by laminating a silver vapor-deposited film with a thickness of 0.2 μm.

(c) This recording layer substrate was coated with a plastic protective layer (paint) of approximately 10 μm to produce a memory plate.

(d) The memory plate was cut into squares by a mechanical method (dicing) using a blade to produce a large number of recording medium chips (15×15xx).

(e) In order to facilitate the handling of this recording medium chip, it was fixed to a holding base material (made of plastic) by embedding, and a chip memory was produced using the same rewritable organic recording material as described above.

(G) Effects of the Invention The chip memory of the present invention can be mass-produced by adding a chip forming process after the film forming process, in which a large number of recording medium chips can be obtained from one memory plate. Therefore, it can be provided as a low-cost optical information recording medium. Furthermore, the recording medium chip of the present invention has sufficient recording capacity for general use, but is very small, so it can be processed into various shapes of recording media (optical cards, optical disks) that are convenient to carry. be.

[Brief explanation of the drawing]

FIG. 1, FIG. 2 (2), and FIG. 3 are configuration explanatory diagrams illustrating the chip memory of the present invention, and FIG. 2 (1) and FIG.
The figures are respectively a configuration explanatory diagram of the recording medium chip of the present invention and a fourth figure.
FIG. 5 is a perspective view showing a recording medium before being cut into chips, FIG. 5 is a perspective view showing a chip memory embedded in a holding base material, and FIG. 6 is a configuration diagram illustrating an optical information recording/reproducing system. It is a diagram. l...recording medium chip, 2...ultraviolet curing resin, 3...substrate,
419. ...Recording layer substrate, 5...Recording layer (
reflective layer), 6...recording layer substrate, 7...
Protective layer, 8...adhesive layer, 9...protective substrate, 10...air layer, 15...memory plate,

Claims (1)

[Claims] 1. A chip memory in which a recording medium chip formed by cutting a recording medium having a recording layer on a substrate that can be recorded and reproduced by a light beam is embedded in a holding base material. 2. The optical information recording medium according to claim 1, wherein the recording layer of the recording medium chip is coated and protected with a protective layer or a protective substrate, either directly or via an air layer. 3. The chip memory according to claim 1, wherein the recording layer is made of an inorganic read-only thin film optical recording material. 4. The chip memory according to claim 1, wherein the recording layer is made of an organic or inorganic write-once thin film optical recording material. 5. The chip memory according to claim 1, wherein the recording layer is made of an organic or inorganic rewritable thin film optical recording material. 6. The chip memory according to claim 1, which is card-shaped or disk-shaped.