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JP59020627 |
PURPOSE: To obtain an information recorded disk having an uneven surface molded in excellent transferability and improved picture and sound qualities by performing compression molding of an information recorded medium in unrecorded dies,...
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JP59016152 |
PURPOSE: To prevent a warp or the like deformation of a disc, and to enable its use in any environment, by laminating a thermoplastic resin layer made of a copolymer of α-methylstyrene and methacrylate having pits corresponding to infor...
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JP59016155 |
PURPOSE: To facilitate peeling from a stamper after manufacturing a disc to prevent a warp or the like deformation, and to enable its use in any environment whatever, from the view point of production, by using a transparent plate made o...
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JP59011553 |
PURPOSE: To improve the tansparency, the low bending restorability, the formability, and the performance of vapor deposition, by adopting a three-layer structure constituting the front and rear layers of the 1st thermoplastic resin and t...
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JP59009024 |
PURPOSE: To obtain the titled duplicate in which a fine air bubble does not mix in a resin layer and a dropout is scarce, by arranging a base plate opposing to a mold, reducing the pressure of a clearance part, casting a radiation curabl...
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JP59009012 |
PURPOSE: To manufacture a stamper having a necessary and satisfactory flatness by lining up and reinforcing the back of a replicating mold prior to rleasing the replicating mold from its original. CONSTITUTION: A back-up reinforcement 15...
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JP59008149 |
PURPOSE: To form a uniform thin film to form high-precision signal pits, by providing a thin metallic film consisting of a metal, which can be etched optically and chemically, on the surface of a glass board. CONSTITUTION: A thin aluminu...
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JP59007023 |
PURPOSE: To make it possible to mold a disk without dust adhering to it, by allowing a stamper that is mounted on a mold to be secured at its central section by a securing shaft and at its periphery by a securing ring, and providing blow...
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JP59001221 |
PURPOSE: To obtain the disk of a good S/N ratio, by controlling the feeding of a material to a main screw by the control of the rotation of a feed motor and varying the load of a main motor and the material density fed to the main screw ...
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JP59001222 |
PURPOSE: To improve the accuracy of a transfer, by placing a softened utraviolet-curing resin between said surface of the original plate having undulatory information signals on its surface and a transparent base plate, pressing the tran...
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JP58224730 |
PURPOSE: To prevent the generation of an residual stress and a sink mark in a resin near the outer peripheral edge of a disk like product, by providing the ring mold which contacts the most outer peripheral edge face of the disk with an ...
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JP58224450 |
PURPOSE: To obtain an original disc of an optical disc high in quality, by forming a specified org. substance layer on a base, forming a metallic layer on this layer, forming holes corresponding to information bits with light beams, and ...
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JP58220709 |
PURPOSE: To improve a manufacturing efficiency and enable to reduce a manufacturing cost, by pushing out a cooling water in a groove by sending a pneumatic air into the fluid passing groove provided in a mold, then sending a steam for he...
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JP58201619 |
PURPOSE: To obtain a disk-like record carrier which is useful for an electrostatic capacity type video disk, etc. by such an arrangement wherein electroconductive carbon black is heat treated in an atmosphere of steam, O2 and SO2, etc. a...
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JP58199124 |
PURPOSE: To obtain a disk excellent in regeneration, heat resistance and shock resistance by a method wherein the disk is formed by the material containing irradiation crosslinking resin of a comparatively low polymerization degree and r...
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JP58196962 |
PURPOSE: To finish the surface of a thin plate satisfactorily in a short time by attaching the thin plate on a turntable to turn the plate and moving an abrasive member in the radial directon, while pressing and forcing it to vibrate. CO...
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JP58193121 |
PURPOSE: To obtain a disk recording body free from defects due to compression molding and of high grade by a method wherein a nozzle part of a melt extruder is provided through the fixed plate of a die clamping device and resin is extrud...
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JP58188636 |
PURPOSE: To provide an injection molding machine capable of punching a penetration hole on the molding after molding in the mold so designed that a receiving die and spool bush are caused to go back by acting in contact with the punch ou...
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JP58185049 |
PURPOSE: To eliminate the separation of a metallic layer from a substrate, by forming a metallic layer having high coupling force with an adhesive on a metallic film to which a recording track pattern is formed and then adhering the meta...
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JP58177539 |
PURPOSE: To prevent a pickup head (reproducing stylus) from breaking, by arranging a conductive softened resin on the base film side of a lamination sheet formed by laminating a thermal deforming resin on a base film and performing compl...
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JP58177327 |
PURPOSE: To increase the molding accuracy, by arranging, at the central parts of top and bottom forces, center pins having a stamper fixing function and a function for molding a central hole in a recording medium, and making at least one...
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JP58177536 |
PURPOSE: To generate a signal for tracking with high precision at low cost by providing a layer where a spiral porjection-recess signal for tracking is provided concentrically on a recording medium provided on a base disk. CONSTITUTION: ...
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JP58177540 |
PURPOSE: To form a high-density disk of high quality with good reproductivity, by arragning a softened resin on the base film side of a lamination sheet formed by laminating a thermal deforming resin film on a base film. CONSTITUTION: A ...
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JP58177325 |
PURPOSE: To mold a disk central hole readily, by providing a columnar projection at the center of one of molds and a cylindrical recess in the center of the other that will mate with the columnar projection, and drilling a material feedi...
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JP58177326 |
PURPOSE: To provide a novel apparatus for molding a disklike recording medium wherein a residual resin that will remain at the disk recording medium central section when it is molded is held by a central hole molding center member, the m...
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JP58176204 |
PURPOSE: To produce the titled low-warpage, optical memory disc in a concentrically and uniformly oriented state, by injection-molding poly-4-methyl-1-pentene of a specified melt flow rate under specified conditions. CONSTITUTION: Poly-4...
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JP58175152 |
PURPOSE: To prevent a metallic film from being peeled from a substrate, namely, a backing material when a disc is duplicated, by attaching a peeling prevention member to the outside circumferential part. CONSTITUTION: A stamper consists ...
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JP58173625 |
PURPOSE: To obtain an information disk of less eccentricity by such an arrangement wherein a radial ray permeable base board having a hole for positioning is coupled with a metal mold having a protruded point for positioning at its cente...
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JP58173623 |
PURPOSE: To obtain an information disk of which distance between its surface and the surface of information signal is constant by such an arrangement wherein a metal mold having uneven information signals, a base board and a pressing pla...
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JP58173624 |
PURPOSE: To obtain an information disk of high precision by such an arrangement wherein a radial ray permeable base board is arranged against a metal mold having uneven information signals with a specified space provided between them, an...
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JP58173626 |
PURPOSE: To obtain a copy of an information disk which is uniform in thickness of its molded resin layer and free from air bubbles and warp by such an arrangement wherein a base board is arranged opposingly to a metal mold with a specifi...
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JP58168528 |
PURPOSE: To obtain a recorded disc made of resin with a uniform thickness by a method wherein photosetting resin is coated on a duplicate mold and then a replica base is placed on the resin and clamped with a pressing plate, which enable...
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JP58166545 |
PURPOSE: To improve heat resistance, molding workability, moisture resistance, replica properties, and mechanical strength as compared with usual unsatured polyester resins by using a thermosetting crystalline unsaturated polyester resin...
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JP58166549 |
PURPOSE: To obtain a disk substrate with superior resistance to heat, moisture, impact and chemicals, superior transparency, resistance to optical rotation, fidelity in molding, etc. by using a specified polymer composition. CONSTITUTION...
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JP58166550 |
PURPOSE: To enhance the resistance to heat, chemicals, moisture and impact, the transparency, resistance to optical rotation and fidelity in molding by forming a magnetic layer which can be changed by energy on one side of an optically t...
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JP58162320 |
PURPOSE: To prevent burrs from producing and a disk surface from breaking by coating the surface of a mold with photosetting resin, placing a replica base thereon, further putting a mask on necessary portion projecting irradiation rays a...
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JP58159202 |
PURPOSE: To prolong service life, by using a radiation curing lacquer layer consisting essentially of a mixture of a radiation curable compd. and a polymer compd. which has compatibility with said compd. and has adhesion to plastic subst...
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JP58158057 |
PURPOSE: To obtain a stamper which is durable to many-time use while improving its surface hardness, by coating surfaces of a master stamper and a dome stamper with nitrified films of aluminum or chromium. CONSTITUTION: The surfaces of t...
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JP58158225 |
PURPOSE: To manufacture an information recording substrate, by using a stamper formed by a special method, and utilizing a spiral concave part wherein stable following of a track can be performed on the entire surfce of the substrate. CO...
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JP58158001 |
PURPOSE: To maintain the adhesion between a radiation-curable lacquer layer and a plastic substrate, by contg. a compd. having unsated. bonds that have the power to dissolve said substrate as a component of the radiation-curable lacquer....
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JP58155550 |
PURPOSE: To make the forming of a stamper easy, by coating duplicatedly photo resists having different sensitivity on a base, exposing the resists in different amount of light, and sensing light is accordance with the pattern so as to fo...
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JP58151223 |
PURPOSE: To enable to mass-produce readily an optical disk substrate which enables to write arbitrarily and has large mechanical strength and high accuracy, by attaching a stamper to the molding surface of a core in a specified condition...
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JP58151222 |
PURPOSE: To contrive improvement of planar accuracy and heat resistance of the titled substrate, by rotating the plastic substrate provided with track grooves at a high speed under the atmosphere of a specified temperature, then lowering...
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JP58150148 |
PURPOSE: To form a stamper which is excellent in transferring and replicating characteristics of a fine pattern and is highly resistive to abrasion and corrosion, by forming a stamper layer on the surface of a coating layer by a nickel e...
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JP58140223 |
PURPOSE: To eliminate cleaning while facilitating the removal of a disc substrate and a molding resin from a stamper by removing a resin material with a high speed air flow as extruded from the inner circumference and the outer circumfer...
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JP58130449 |
PURPOSE: To make the transfer accuracy of signal its good and transfer time short and to improve releasing from a stamper and adhesion to a plastic substrate by using radiation-curable polybutadiene as radiation curable lacquer. CONSTITU...
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JP58126119 |
PURPOSE: To prepare molding excellent in transparency, poor in optical distorsion by making injection molding of specific polycarbonate resin containig phosphite. CONSTITUTION: Bis(hydroxy phenyl)alkane polycarbonate resin with an averag...
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JP58118222 |
PURPOSE: To considerably reduce the size of a forming device by such an arrangement wherein a substrate on which ultraviolet ray setting type resin is dripped is caused to rotate at a high speed and a stamper having specific signals is b...
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JP58110220 |
PURPOSE: To produce a substrate for optical disc excellent in a transferring property, by using a stamper prepared by applying a solution of a phosphate ester containing a fluoroalkyl group on an Ni stamper surface and baking the surface...
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JP58104724 |
PURPOSE: To reduce the pressed-out amount of ultraviolet curing resin as less as possible during the transfer by weighing the disk base, spraying ultraviolet curing resin thereon and fixing the total weight of the disk base and the ultra...
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