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JPS6392438A |
PURPOSE: To highly accurately transfer information group to a substrate at low cost by a structure wherein a positioning mechanism consists of a centering member, which abuts against the inner wall of the center hole of the substrate at ...
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JPS6391823A |
1. Smooth, thin, circular, rigid substrate made of polymeric material, for a magnetic recording disc, characterized by the following points : the said polymer is a thermotropic polymer chosen from wholly aromatic polyesters, alkylaromati...
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JPS6318254B2 |
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JPS6315650B2 |
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JPS6369041A |
PURPOSE: To easily produce a substrate for an optical recording medium which does not contain air bubbles and has high reliability by heating a curable resin in the stage before the substrate is imposed on the curable resin and removing ...
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JPS6313807B2 |
A hot sprue assembly is provided for controlling flow of molten material into the mold cavity of an injection molding machine. The hot sprue assembly is particularly designed for use with an injection molding machine for molding centrall...
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JPS6312778B2 |
The device of the invention allows a flexible substrate to be applied against the etched matrix with insertion therebetween of a layer of resin, the application of the substrate on the matrix taking place from the center progressively to...
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JPS6310481B2 |
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JPS6310482B2 |
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JPS6334108A |
PURPOSE: To manufacture a disc board excellent in dimensional accuracy by a method wherein the irradiation of light energy over photo-setting resin is performed under the state that a nozzle is protruded spatially and the center hole spa...
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JPS633799Y2 |
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JPS631641B2 |
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JPS63212B2 |
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JPS6261418B2 |
A preform molding apparatus includes a mold cup which has opposed top and bottom mold members and a carrier arm between the mold members. The top mold member has a concave mold recess in its bottom surface and a semi-cylindrical rim exte...
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JPS62293535A |
PURPOSE: To improve the mass productivity and pattern transfer performance by coating a high polymer resin film to an electronic plating face of a master mold transferring pattern information so as to improve the removal of the transferr...
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JPS6261419B2 |
An improved apparatus and method of molding a high density information disc which includes maintaining the molding composition at an elevated temperature between the extrusion step and the record pressing step, such that the resultant di...
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JPS6260260B2 |
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JPS62279540A |
PURPOSE: To obtain a disk having high stability for a long period of time by providing a thin film consisting of a mixture composed of a silicone oil and specific surface active agent on the surface of an information recording disk consi...
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JPS62279541A |
PURPOSE: To obtain a disk which has excellent durability an is stable for a long period of time by providing a thin film consisting of a mixture composed of specific compds. on the surface of an information recording disk consisting of a...
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JPS6255201B2 |
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JPS6253338B2 |
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JPS6252704B2 |
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JPS6250897B2 |
A method for manufacturing an information memory disk comprises a process for preparing a die having an annular first rugged portion corresponding to tracks, and an annular second rugged portion corresponding to a positioning mark and co...
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JPS62238723A |
PURPOSE: To cover both surfaces of a core material with uniform thickness resin layer by preventing deformation of the core material, by a method wherein a positioning protrusion of a mold is inserted into a positioning hole of the diskl...
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JPS62231436A |
PURPOSE: To prevent an adhesive from infiltrating to the center hold and to obtain an optical disk substrate for an optical disk with high quality by forming projecting part on an inner circumferential part of a bonded face of at least o...
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JPS6245809B2 |
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JPS6237708Y2 |
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JPS6237710Y2 |
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JPS6237697Y2 |
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JPS6237709Y2 |
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JPS6244323B2 |
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JPS6241852B2 |
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JPS62200547A |
PURPOSE: To obtain an optical disk substrate which is highly resistant to heat and moisture absorption and has a low double refractive index by injecting and curing a reactive liquid for molding a synthetic resin by a reaction injection ...
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JPS6241451B2 |
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JPS62197937A |
PURPOSE: To obtain many optical disk substrates by cast molding of one time and improve productivity by forming a cylindrical material of optical disk by cast molding and obtaining plural optical disk substrates by cutting it. CONSTITUTI...
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JPS62197938A |
PURPOSE: To improve efficiency of work and mass productivity by including a process in which sheet material of semi-hardened state is obtained by extrusion molding, a process in which a substrate is cut out and a process in which the sub...
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JPS62196126A |
PURPOSE: To obtain an optical disc excellent in productivity by a structure wherein a reloadable recording layer is held on a substrate made of specified polycarbonate. CONSTITUTION: A plastic substrate consists of polycarbonate which co...
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JPS62196127A |
PURPOSE: To obtain a high sensitivity magneto-optical recording disc by a structure wherein an amorphous layer of rare earth-transition metal is held on a substrate made of specified polycarbonate. CONSTITUTION: A plastic substrate consi...
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JPS62162526A |
PURPOSE: To obtain a recording medium whose error rate is low and whose stamper can be used for a long period of time, by a method wherein a recording layer is provided on the stamper, over which a resin layer curing through a specific w...
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JPS62162257A |
PURPOSE: To reduce the warpage and reggedness of the titled substrate and to improve the flatness by completely curing the cross-linking plastic plate of vinyl ester resin, polyester resin, etc., which has been primarily cured in a mold ...
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JPS62162256A |
PURPOSE: To obtain the titled optical disk having high recording sensitivity, density, and reliability by using the material obtained by curing an UV curing resin composition consisting of a specified compd. and a photopolymerization ini...
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JPS62142617A |
PURPOSE: To constitute the titled device so that a stamper disk does not deform even if the stamper disk is fixed firmly and strong negative pressure is applied to the same by so constituting the stamper that the negative pressure acts u...
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JPS6224517Y2 |
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JPS6225092B2 |
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JPS62117153A |
PURPOSE: To obtain the titled disk without any remaining molding strains and capable of regulating the refractive index by treating both surfaces of the substrate with a soln. contg. a silane compd. having an ethylenic double bond, heati...
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JPS62109623A |
PURPOSE: To manufacture the disc with an accurately finished aperture carrying the tapered face by combining the specific molding process and the cutting process. CONSTITUTION: The disc molded part 13 in which the signals of stamper 6 ar...
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JPS6258439A |
(57) [Abstract] Since this gazette is application data in front of an electronic application, the data of an abstract is not recorded.
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JPS629943A |
PURPOSE: To offer a spin sticking method without any adhesion of a liquidous viscous material (UV resin) which rebounds from a cover for scattering protec tion on a base plate surface even if scattering of UV resin occurs during spin nin...
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JPS623933A |
PURPOSE: To prevent rejected product from generating by a method wherein the required amount of ultraviolet curing resin, which is supplied onto a reproduction master disc for reproducing information recording medium disc, is supplied at...
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JPS6159209B2 |
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