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公开(公告)号：JPH09293347A
公开(公告)日：1997-11-11
申请号：JP10742696
申请日：1996-04-26
Applicant: TORAY INDUSTRIES
Inventor： IWAMOTO MASAAKI , FUKUDA HIROYUKI , KINOSHITA FUMIO
IPC: G11B23/03
Abstract: PROBLEM TO BE SOLVED: To obtain an inexpensive disk cartridge in which there is no fear of warp and deterioration in the appearance even in a severe usage and storage environment such as high-temperature, high-humidity or the like. SOLUTION: A disk cartridge is provided with a synthetic-resin cartridge case and with a shutter, and it houses a disk, for high-density recording, at a recording density of 1MB/cm or higher such as a phase-change optical disk, a magneto-optical disk, a magnetic disk or the like. At this time, the synthetic- resin cartridge disk is moled by an injection molding method or the like while a synthetic resin which contains N-phenylmaleimide as its component is used as a material. As a method of preparing the synthetic resin which contains the N-phenylmaleimide as its component, aniline is reacted with a synthetic resin which contains, e.g. the component of maleic anhydride, and a maleic anhydride group which is contained in the synthetic resin is converted into an imide. In this case, as the synthetic resin, e.g. an ABS resin is used, and the content of the component of the N-phenylmaleimide is set at 5 to 20wt.%.
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公开(公告)号：JPH09198722A
公开(公告)日：1997-07-31
申请号：JP2316496
申请日：1996-01-16
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a substrate of optical recording medium which reduces double refraction and is excellent in transferability. SOLUTION: Molding clamping pressure and/or core compressive force are controlled in plural steps while controlling the molding clamping pressure at a level higher than the core compressive force by which a fused resin within a cavity 24 is compressed during the time from the start of injection and filling until the opening of a mold when the fused resin is injected and filled into the cavity 24 of a molding die 8, to which a stamper 20 is fitted, to form the substrate of the optical recording medium.
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公开(公告)号：JPH09288852A
公开(公告)日：1997-11-04
申请号：JP12245196
申请日：1996-04-19
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To mold a substrate with high precision by improving flovability, a transferring property and a mold release property at the time of molding the substrate and to realize an optical recording medium excellent in recording and reproducing characteristics by using the substrate. SOLUTION: In a stamper 1 for forming a substrate recording surface of the optical recording medium having projected parts 2 for forming grooves and/or pits for recording signals on the substrate, a crossing part between a slope 3 and a top face 4 and/or a crossing part between the slope 3 and a bottom face 6 of the projected parts 2 of the stamper 1 are formed to be curved surfaces 5, 7 having radius of curvature equivalent to 1 to 5 times the height H of the projected parts 2.
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Patent Agency Ranking
公开(公告)号：JPH09180252A
公开(公告)日：1997-07-11
申请号：JP35259995
申请日：1995-12-28
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To improve the releasing property of a substrate from a stamper or a metallic mold, to suppress deformation such as the warpage of a surface and to make the mechanical characteristics excellent. SOLUTION: In the substrate 1 of an optical recording medium equipped with a information surface 2 having a recorded information area and a flat surface 3 on the rear side of the information surface 2, fine line grooves and/or recessed having a surface roughness Rmax of 20 to 100nm are formed in both areas, one area outside the recorded information area 4 on the information surface 2 or the other area outside the recorded information area 4 on the information surface 2 and the flat surface 3 on the rear side corresponding to this area.
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公开(公告)号：JPH09198723A
公开(公告)日：1997-07-31
申请号：JP2316596
申请日：1996-01-16
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To obtain a substrate which improves the durability of a cut punch, is less in deformation at the inner peripheral part, is good in machining accuracy and is less in fluctuation over a long period, and further to obtain the substrate which generates little strain at the time of cutting driving holes and enables the reduction of double refraction. SOLUTION: When the fused resin is injected and filled into the cavity 31 of a molding die 20, to which a stamper 30 for forming a groove and/or pit for information recording on the substrate is fitted, and a gate part 40 of the cut punch 34 at the inside of the die 20 is cut to manufacture the substrate of an optical recording medium, the cut punch 34 is constituted so as to be held forwarding and then followed by backwarding, while controlling the cut punch pressure in the releasing direction in plural steps or immediately after the lapse of a very short time or during the time until the opening of a mold after the gate part 40 is cut.
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公开(公告)号：JPH10241215A
公开(公告)日：1998-09-11
申请号：JP4221097
申请日：1997-02-26
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , IWAMOTO MASAAKI
IPC: G11B7/26
Abstract: PROBLEM TO BE SOLVED: To control warpage of an optical recording medium substrate to within a specified range and the suppress fluctuation of warpage by controlling the whole flow rate of the air blown on the opposite side to a stamper to be specified times as the whole flow rate of the air blown to the stamper side. SOLUTION: Solenoid valves 68, 69 are opened several seconds before the dies air opened by a solenoid valve controller 70 so as to blow air from an air supply surface of a specified time. The air is blown through a filter 71, solenoid valves 68, 69, flow controlling diaphragms 66, 67, flow meters 64, 65, air passages 60, 62 to the space between the substrate and a stamper 30 and the space between the substrate and the cavity. In this process, the whole flow amt. of the air blown to the side opposite to the stamper is controlled to
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公开(公告)号：JPH09180273A
公开(公告)日：1997-07-11
申请号：JP35260095
申请日：1995-12-28
Applicant: TORAY INDUSTRIES
Inventor： HATSU TOSHIHIRO , KINOSHITA FUMIO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To allow smooth thermal expansion of a stamper and to enable molding substrate of an optical recording medium of high quality. SOLUTION: At the time of molding the substrate of optical recording medium, this stamper 1 has an information region 3 for forming a groove and/or a pit for recording signals on the substrate 2 side. A thin thickness part 4 having a thickness thiner than the thickness at the information region 3 is formed in the radial direction of the stamper 1 from an outside of the information region 3 to the outer periphery of the stamper 1.
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公开(公告)号：JPH0954983A
公开(公告)日：1997-02-25
申请号：JP22591695
申请日：1995-08-10
Applicant: TORAY INDUSTRIES
Inventor： KINOSHITA FUMIO , HATSU TOSHIHIRO , NAKANISHI TOSHIHARU
Abstract: PROBLEM TO BE SOLVED: To improve flowability, transferability and mold releasability at the time of molding a substrate, to mold a high precision substrate and to obtain an optical recording medium having satisfactory recording and reproducing characteristics with the substrate. SOLUTION: A resin compsn. based on polycarbonate and contg. 0.001-0.05wt.% higher fatty acid ester of polyhydric alcohol based on the weight of the polycarbonate is molded to form a substrate. The ratio (Mw/Mn) of the wt. average mol. wt. (Mw) of the polycarbonate to the number average mol. wt. (Mn) is >=2.5 and the viscosity average mol. wt. of the polycarbonate is 13,000-18,000. A recording layer is formed on the substrate.
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