公开(公告)号：JPH05124353A

公开(公告)日：1993-05-21

申请号：JP29149491

申请日：1991-11-07

Applicant: TORAY INDUSTRIES

Inventor： SUMIO KAZUO ,  OBAYASHI GENTARO ,  HIROTA KUSATO

IPC: B41M5/26 ,  G11B7/24 ,  G11B7/243

Abstract: PURPOSE:To obtain a photorecording medium having high sensitivity, deletion rate and C/N by providing a recording layer which is formed using tellurium of a single crystal as a main component of a recording material, blended with a non-reactive chemical compound on a substrate. CONSTITUTION:The subject photorecording medium consists of a recording layer formed using a blend of a substantially continuous recording material of tellurium of a single crystal as a main crystalline component, and a substantially non-reactive chemical compound additive to said recording materials, laminated with a derivative layer, on a substrate. The recording materials of the recording layer is a chalchogen compound based on Te which takes at least, two states, crystal and non-crystal, with a crystal materials. In addition, the additive blended in the recording layer are, for example, ZnS, SiO2, etc. The dielectric layer should preferably be formed using an inorganic film such as ZnS or Al2O3. The technique to form the recording layer on the substrate is such as vacuum evaporation, ion plating or sputtering.

公开(公告)号：JPH01115686A

公开(公告)日：1989-05-08

申请号：JP27433387

申请日：1987-10-29

Applicant: TORAY INDUSTRIES

Inventor： HIROTA KUSATO ,  OBAYASHI GENTARO ,  NAKANISHI TOSHIHARU

IPC: B41M5/26 ,  G11B7/243

Abstract: PURPOSE:To obtain an optical recording medium low in toxicity of a recording layer, requiring low power for recording and capable of high speed deletion of a record, by specifying the composition of the recording layer of an optical recording medium comprising the recording layer on a substrate and capable of recording, reproduction and deletion of information by irradiating the recording layer with light. CONSTITUTION:The composition of a recording layer is in the range of the formula (SbX Te100-X)100-YInY, in an optical recording medium comprising the recording layer on a substrate and capable of recording, reproduction and deletion of information by irradiating the recording layer with light. In the formula, X is a number satisfying 70>X>65, Y is a number satisfying 7>=Y>=1, the numbers X and 100-X inside the parentheses are respectively atomic ratios of Sb and Te, and the numbers 100-Y and Y outside the parentheses are respectively the total atom% of Te end the total atom% of In. Namely, Y=100X(the number of atoms of In)/(the total number of atoms of all constituents in the formula) and 100-Y=100X(the sum of the numbers of atoms of Sb and Te)/(the total number of atoms of all constituents in the formula). The optical recording medium requires low power for recording, is capable of high- speed deletion of a record, is high in thermal stability of recorded marks, and has excellent resistant to moist heat.

公开(公告)号：JP2003132535A

公开(公告)日：2003-05-09

申请号：JP2002253716

申请日：2002-08-30

Applicant: TORAY INDUSTRIES

Inventor： NAGINO KUNIHISA ,  HIROTA KUSATO ,  OBAYASHI GENTARO

IPC: G11B7/243 ,  G11B7/0045 ,  G11B7/24

Abstract: PROBLEM TO BE SOLVED: To provide a recording method on an optical recording medium, which can reduce cross talk, make even the amplitude of the signals reproduced from the lands and grooves and also reduce cross erasing. SOLUTION: In the recording method on an optical recording medium that information recording and erasing are made by changing the phases, amorphous and crystalline, and also on the lands and grooves, the method of this invention is featured in that it makes recording using the peak power and the bias power that make the mark width recorded on the lands 1/2 or larger but less than 1 or the mark on the flat land area or the mark width recorded on the grooves 1/2 or larger but less than 1 or the mark on the flat groove area.

公开(公告)号：JP2001134989A

公开(公告)日：2001-05-18

申请号：JP31502999

申请日：1999-11-05

Applicant: TORAY INDUSTRIES

Inventor： SADAKUNI HIRONOBU ,  HIROTA KUSATO

IPC: G11B7/26

Abstract: PROBLEM TO BE SOLVED: To provide an optical master disk for manufacturing an optical disk substrate and a method for manufacturing the optical disk substrate by which the substrate having a required groove shape is obtained in shaping of the optical disk substrate. SOLUTION: In the method for manufacturing the optical disk substrate having a groove, when the half-value width of the groove and the half-value width of the land of the optical master disk used in injection molding are shown by G and L respectively and the half-value width of the land and the half-value width of the groove of the optical disk substrate obtained by using the optical master disk are shown by L' and G' respectively, the optical master disk which is corrected so that L'/G is 1.02 to 1.08 and moreover G'/L is 0.92 to 0.98 is used.

公开(公告)号：JPH07161071A

公开(公告)日：1995-06-23

申请号：JP30828093

申请日：1993-12-08

Applicant: TORAY INDUSTRIES

Inventor： HIROTA KUSATO ,  OBAYASHI GENTARO ,  SEO HISAYA

IPC: G11B7/241 ,  G11B7/24

Abstract: PURPOSE:To improve the rate of erasure and jitter characteristics by forming a laminated body consisting of at least a transparent substrate, a 1st dielectric layer, a recording layer, a 2nd dielectric layer, a high refractive index layer and a light absorbing layer. CONSTITUTION:In this optical recording medium, the quantity of light absorbed in the recording layer in an amorphous state is reduced and can be made equal to or larger than that in a crystalline state by newly disposing a laminated part consisting of a high refractive index layer and a light absorbing layer in place of the conventional reflecting layer. As a result, difference in temp. rise at the time of recording is reduced, the deformation of recording marks and a shift of formation positions can be suppressed and erasing characteristics and jitter characteristics can be imporved. Even after recording and erasure are repeated many times, action is stable and the deterioration of the characteristics and the occurrence of defects are hardly caused.

公开(公告)号：JPH06333263A

公开(公告)日：1994-12-02

申请号：JP12137693

申请日：1993-05-24

Applicant: TORAY INDUSTRIES

Inventor： WATANABE YUJI ,  OBAYASHI GENTARO ,  HIROTA KUSATO

IPC: G11B7/241 ,  G11B7/24

Abstract: PURPOSE:To improve the recording sensitivity and to suppress changes in film properties of a recording layer or deterioration of performance of an optical recording medium consisting of a substrate, recording layer, and dielectric layer by incorporating an oxide and carbon into the dielectric layer. CONSTITUTION:The dielectric layer used for this recording medium consists of at least an oxide and carbon so that the inner stress of the dielectric layer is decreased. Thereby, the obtd. optical recording medium has little mechanical change such as warpage. Further, excellent adhesion strength with the recording layer is obtd. so that peeling of films or cracks can be suppressed. By an observation of the dielectric film such as SiO2 with addition of carbon (SiO2-C) by TEM(transmission electron microscope), it is found that the film is a uniform amorphous film and has no grain boundary which are apt to become the passage for oxygen and water. Thereby, changes of film properties or deterioration of performance of the recording layer can be suppressed.

公开(公告)号：JPH06215415A

公开(公告)日：1994-08-05

申请号：JP395293

申请日：1993-01-13

Applicant: TORAY INDUSTRIES

Inventor： SEO HISAYA ,  OBAYASHI GENTARO ,  HIROTA KUSATO

IPC: G11B7/00 ,  G11B7/003 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/24 ,  G11B7/241 ,  G11B7/254 ,  G11B7/257

Abstract: PURPOSE:To provide the optical recording medium with which high C/N is obtainable in spite of use of a short-wavelength laser beam for recording and erasing and which has a high recording density by specifying the range of the refractive index and thickness of a first dielectric layer. CONSTITUTION:The wavelength lambda of irradiating light, refractive index (n) and thickness (d) of a first dielectric layer in the optical recording medium successively having at least the first dielectric layer, recording layer, second dielectric layer and reflection layer on a substrate are specified to the range expressed by 1.5

公开(公告)号：JPH05334723A

公开(公告)日：1993-12-17

申请号：JP13932392

申请日：1992-05-29

Applicant: TORAY INDUSTRIES

Inventor： WATANABE YUJI ,  OBAYASHI GENTARO ,  HIROTA KUSATO

IPC: G11B7/254 ,  G11B7/24 ,  G11B7/257

Abstract: PURPOSE:To suppress mechanical deformation such as warp, to improve mechanical characteristics, to attain excellent adhesive strength of a dielectric layer to a recording layer, to prevent the exfoliation and cracking of the layers and to ensure reliability over a long period of time. CONSTITUTION:In an optical recording medium with a substrate, a recording layer and a dielectric layer, the dielectric layer is made of a composite contg. at least a chalcogen compd., a nitride and carbon. In the case of an optical recording medium capable of repeated recording and erasing, the extent of transfer of the material of the recording layer to the track direction is reduced and repetitive characteristics of recording and erasing is improved.

公开(公告)号：JPH05128591A

公开(公告)日：1993-05-25

申请号：JP29149091

申请日：1991-11-07

Applicant: TORAY INDUSTRIES

Inventor： WATANABE YUJI ,  OBAYASHI GENTARO ,  HIROTA KUSATO

IPC: G11B7/241 ,  B41M5/26 ,  G11B7/24 ,  G11B7/254 ,  G11B7/257

Abstract: PURPOSE:To remarkably, improve the degree of freedoms when an optical recording medium is optically designed. CONSTITUTION:An optical recording medium has a recording layer and a dielectric layer on a substrate. The dielectric layer contains a composite compound containing at least chalcogen compound, fluoride and carbon (C). Accordingly, since an internal stress generated in the dielectric layer can be reduced, a mechanical deformation such as warpage is small and mechanical characteristics are excellent. Further, adhesive strength of the dielectric layer and the recording layer is excellent. Peeling, a crack of the film are eliminated. Long term reliability is obtained. In the case of an optical recording medium which can be repeatedly recorded and erased, repeatability of recording/erasing is satisfactory. In addition, the refractive index of the dielectric layer can be controlled.

公开(公告)号：JPH0540961A

公开(公告)日：1993-02-19

申请号：JP19963091

申请日：1991-08-08

Applicant: TORAY INDUSTRIES

Inventor： HIROTA KUSATO ,  OBAYASHI GENTARO ,  WATANABE OSAMU

IPC: G11B7/258 ,  G11B7/24

Abstract: PURPOSE:To provide the optical recording medium which is stable in operation in spite of repetition of many times of recording and erasing, is substantially free from the generation of deterioration in characteristics and defects, is highly resistant to moist heat and oxidation, has a log life and a high erasing rate and c/n, and has a high sensitivity. CONSTITUTION:This phase transition type optical recording medium has a reflection layer consisting of a mixture composed of Al or Al alloy and the oxide, nitride, nitrooxide, carbide, sulfide, etc., of metals.