JPS589229A - Optical recording medium - Google Patents

Abstract

PURPOSE:To obtain a high-sensitivity, long-life optical recording body which uses a low-output semiconductor laser while preventing the deformation of a resin plate and the oxidation of a recording film, by providing thin recording films, each consisting essentially of Te and C, on both sides of the organic resin plate which has low thermal conductivity. CONSTITUTION:On both surfaces of an organic resin substrate 3 with low thermal conductivity such as an acrylic resin plate having <=1X10<-3>cal/sec thermal conductivity, optical recording films 4 which consist essentially of Te and C while containing H and O are formed by sputtering Te in gaseous CH4, etc., obtaining an optical recording disk. Because both the surfaces of the resin plate 3 are covered with the films 4, neither curvature nor strain due to humidity and temperature is caused. Further, the films 4 never become transparent owing to oxidation and a high-sensitivity, long-life recording medium for optical recording and reading which uses a low-output semiconductor laser is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording medium using a heat cage. ) Relating to an optical recording medium in which the reflectance or transmittance of the medium is changed by altering or evaporating the medium film. 4. , .

Traditionally, typical examples of t species are G, CJeuw@y@
Kame al's paper, “All optical disk
reprac@s! 5mg Tape Lu” (1111
8PIiiiCTRUM, p attack!・b, 111? l),
) As shown in Figure 2, the disk substrate is made of a material with low thermal conductivity.
The body membrane uses a metal layer with low melting point, low boiling point, and low thermal conductivity.
The current technique of 01L is to use an acrylic tree layer on the substrate, a thick tellurium ('To) and a thin horse on the base.
0, which is coming to the previous stage of practical 4t.

The 1511th is a conventional light beam such as H, G, medium, and a cross-sectional view of the Cicada substrate (pass piece, I!,
- A medium with a low internal reflectivity (also a small external reflectance),
Genus-W! Intimidation.

1Jllaφ11111! KL holder for calligraphy,
The light is connected to the substrate (1) and the light is integrated from the medium film (2) side (
1) - Irradiation, irradiation, alteration of medium film (2), *form, evaporation 1
Let me know the information! 11! height,.

For reading, the medium film #2) is irradiated with a laser beam of 74 or less intensities of the laser beam used during self-writing, and the information is read by changes in reflectance or transmittance. Usually, the transparent substrate (1) is 1-
Made of acrylic resin with a thickness of 2mm, the media film (2) is approximately 5mm thick.
X's 〒・Thin film is used, and the distribution is 〒・Approximately I due to evaporation of the thin film.
It is made with a diameter of J1111φ, and the whole is in the shape of a disk with a diameter of 3 Daa.

However, in such conventional optical storage media,
There is a big problem that cannot be solved in practical application.

This means that no guarantee can be given regarding the lifespan, especially regarding the weather resistance and wetness resistance of the acrylic resin substrate and the T@ thin film.

As is well known, acrylic resin is transparent to visible light and near-infrared light, has excellent surface smoothness, formability, and preciousness, and has lower thermal conductivity than glass, so it is used as a substrate for heat mode recording. Hiro is an ideal material.

However, acrylic resin has the disadvantage that organic materials tend to absorb water and the resin expands and contracts depending on the degree of water absorption.In other words, if both sides of an acrylic board are exposed to the same temperature and humidity, both sides will expand and contract. The degree of expansion and contraction of is the same),
Warpage and distortion of the board do not occur, but if a metal film is formed on one side of the board, for example, which does not absorb or transmit water, the temperature of the acrylic resin on that surface will be slower. Since the other sides are open, they are sensitive and, on the other hand, tension occurs only on one side, and warping and distortion of the board immediately occur. This board sled,
Distortion etc. becomes more severe as the diameter of the deformer increases, and in the case of straight flaws, the warp direction is distorted and the plate is deformed by more than 1 in the thickness direction on dry and rainy days. Furthermore, stress and strain associated with the deformation occur in the deflection, making the polarization angle of the light look complicated. The problem with this plate is that the flatness of the plate surface, which allows focus to follow automatically, has become so large that it has become impossible to focus. , the disk will no longer be able to function as a disk. Also, polarization distortion 4
However, based on the method derived from Motoyori, which is used for the purpose of preserving the media film, a laser beam is dispersed and focused.
This causes noise etc. during J output *) and slows down the supply of uniform discs. .

Therefore, when acrylic resin is used as a high-density disk recording layer substrate, it is placed under strict temperature control from the time it is applied as a substrate and the film is formed.

It must be under the same conditions during assembly, operation, storage, etc. as a DLSC. It is almost impossible to guarantee a lifespan of more than 10 years in a climate like Japan, which has high temperatures and humidity, and low temperatures and dryness.This problem can be resolved by using a glass substrate, but glass@Mori acrylic resin Since the heat conductivity is more than twice that of the previous one, heat dissipates faster, so more than twice as much heat is required to record on the storage film in heat mode. -Kuseza, 11
1 chive.

And when a high-power laser is used, the equipment becomes larger and adjustments are required.
It takes a long time (ToI) in terms of maintenance life, etc., and is also expensive.

Now that semiconductor lasers have become widespread, the area around the disk has become smaller and more compact. If high output is produced, the service life will be extremely short. Because of the low output and 1%/m, it cannot be used as a laser source for the above-mentioned Meclas board disk, and the acrylic Tree M*@requires disk.

On the other hand, the thin film used as the media film also has a major drawback in terms of service life. It is easily oxidized in the presence of warm air, and the oxide film of '7' has a transparent round shape and a metallic color.In Japan's climate, it becomes a transparent film. It is heavy and has no use as a recording membrane. According to our accelerated test result, 70℃; 8
Under 1!11BH, transparency progresses in 4 hours. The combination of Atari kI and Te thin film to transmit moisture through 119V%9 produced excellent results at the research facility of the heat mode le sickle, but it has not yet reached the point of practical use. This is the current situation.

The original @Hiro examined those shortcomings. The purpose of the present invention is to provide an optical recording medium for one-to-one cards that uses an acrylic resin substrate and has a guaranteed lifespan of 10 years or more.

In other words, the light of the present invention is strictly an organic resin with low thermal conductivity! ! A memory film mainly composed of Te5esp (T) and carbon (C) is formed on both sides of the board, and by this, for example, warping of the board made of acrylic resin, distortion, etc. can be prevented. By preventing deformation and oxidation of the storage medium, it is possible to put into practical use a high-sensitivity, long-life optical recording/reading medium using a low-output semiconductor laser. That's it.

The present invention will be described in detail below with reference to the drawings.

2Ii is a sectional view showing an example of -s koji of the recording medium of the present invention.

Transparent acrylic resin group 1 [(3)
) and carbon (C) as the main components, recording and reading of information is performed using separate layers with different reflectances, and the thin films on both sides can be used as media films. It is a feature. That is, as mentioned above, in the structure shown in Fig. 1, the acrylic substrate is deformed by water **UC from one side, but in the structure of this invention, both sides of the acrylic substrate are covered with a film of the same material. Therefore, deformation lines will not occur. However, strict conditions are required for the film quality, and the first thing is that it has excellent weather resistance, especially moisture resistance, and the second is that it has a reflectance of 1 degree, which is the same as that of the KTe thin film, and has a reflectance of 1 degree. All you have to do is write information with a laser puff. As a result of searching for a thin film that satisfies both of these conditions, we found that a thin film containing T and C as main components satisfies these conditions. This thin film is formed by sputtering T· in methane (cH4) gas, so-called reactive sputtering, Jl ring.

The film quality is monocrystalline, and the film is made of Te and C.

h), the main components are TI and C
Also, although it has a base color of 1/2 compared to TI, it has almost the same reflectance in the vicinity of 800 m, which is the wavelength range of semiconductor seeds.

This thin film has extremely good moisture resistance. For example, when exposed to the atmosphere of To'o and Tssiii as an accelerated test, it oxidizes in 4 hours in To'o and Tssiii, making it no longer practical to supply electricity. ＠-〇ll showed no change even after 30 days or more, and simple calculations showed that it had 1110 times the II resistance of the TE film. If the 1lII resistance of Te-uma is assumed to be half a year, the TI-C thin film of TE-MA has an AM resistance of 110 years. From this result, the first condition mentioned above is satisfied by K
You can figure it out by adding 11. Next, under the conditions of 3, the -4 write sensitivity was also evaluated at the disc's length! It was found that a sensitivity comparable to that of a film can be obtained. Due to the heat peak, the sensitivity is expressed as the product of the irradiation time of the sheet and the irradiation time. So, if you irradiate 200m5 of Kk Tamitei conductor Lacey, T.
Desired holes are formed in both the membrane and the T/-C membrane as planned, and a readout output with a sufficient ratio can be obtained by distributing the information.

The reason why the Tee-C film has such outstanding properties is that when sputtering in methane gas, the menal group changes to @ and becomes a radical), and reacts with Chi ions to create a network that looks like an organic metal. This is presumed to be due to the formation of a film. This rounding and oversizing is 1 to 99 times smaller than that of conventional metals.
On the other hand, since it has a structure in which oxidation is impossible, it has excellent weather resistance, and the methyl group does not have any effect on irradiated light, so it is said that it has a sensitivity similar to that of Teuma. considered to be a thing. lLs, the conventional Demeta structure is mainly composed of a sandwich lid, but the disc structure of the present invention can be made into a simple structure of a single plate as shown in Fig. 3. (3) is the substrate, (4) is the medium film, and (5) is the center hole of the disk.

As can be seen from this figure, the distal device of the present invention has the simplest structure suitable for use in industrial engineering IIK.

As explained above, TI-C is applied to both Ws of the acrylic resin board.
By forming a body film on the IQ sickle medium, we succeeded in extending the lifespan of the heat disk storage medium.90 Moreover, the pigeonhole was made into a disk structure, and it became the simplest structure, making it suitable for self-sustainability. self-sufficient supply. In addition, it was possible to use rounded conductor sheaths, reduce the size of the metal body of the device, greatly improve reliability, and make it possible to put optical recording devices into practical use.

&&, due to handling of the disc, fingerprints, dust, etc.
) Since it grows naturally, a membrane may be formed on the genus in order to preserve its suppurative function.

In addition, acrylic resin was used as the expansion substrate in the examples.

9, the thermal conductivity is I x 1G-"cat/s
- The 4-hour phenomenon is possible with other organic substrates of C or lower, such as vinyl chloride, vinyl acetate, polystyrene, etc. Furthermore, reactive sputtering in methane gas is cited as a method for forming the e-C film. other gases such as ethane, propane, ethylene,
A. It is also possible to use a gas such as tyrene or other methods, such as using a gas such as tyrene.

[Brief explanation of drawings]

Figure 1 is a diagram of a conventional Koki Brass plot, No. J! The figure is a one-stroke diagram showing one embodiment of the present invention, and sIi is a cross-sectional view of a round frame in which the optical recording medium of the present invention is configured in a disk shape. (3)...Acrylic substrate, (4)...Te-C recording medium. (5)... Disk center type. Figure 1 1s 2 Figure 8

Claims (1)

[Claims] (5) Prejudice between an organic resin substrate having low thermal conductivity and a memory thin film mainly composed of tellurium and carbon formed on both sides of this substrate.1. The recording medium film is irradiated with an energy beam to alter, deform, or evaporate the storage medium to transfer information. Features nine features, such as brass, and a light
! Brass medium @,. (2) The optical recording medium according to claim 1, wherein the organic resin substrate is a metal having a thermal conductivity of less than or equal to 1/@@@. ) The optical recording medium according to claim 1, characterized in that the organic tree 11!! board is an acrylic or resin substrate. (4) Memory thin metals such as tellurium, carbon, and hydrogen 41111. Optical recording medium 0 according to claim 111, wherein the optical recording medium 0 contains a -element.