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JPS60131657A |
The invention provides a process for manufacturing optical disks by pressing and disks obtained by such a process, for improving the inherent flatness of the optical disk of the thick type, obtained by a process of pressing between a rec...
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JPS6098124U |
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JPS6098125U |
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JPS6028041B2 |
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JPS60122141A |
PURPOSE: To permit manufacturing of a disk with a thin layer of resin by reducing, to a certain degree of vacuum, the pressure of a resin layer between a stamper and a transparent substrate. CONSTITUTION: During the process of transfer a...
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JPS60122138A |
PURPOSE: To secure the transfer of signals onto a resin layer from a stamper by reducing pressure down to a specified vacuum between a base and a transparent substrate placed on the stamper through a liquid radiation hardening resin to p...
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JPS60122139A |
PURPOSE: To separate a disc from a stamper quickly and accurately without damage thereto by forcing air between a base kept airtight and the inner surface of a transparent substrate. CONSTITUTION: In the separation process, a vacuum pad ...
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JPS60115023A |
A double-sided stretched surface recording disk (10) includes a circular, planar main body (24) at the periphery of which are located two reference surfaces (20, 22). Iron-oxide coated polymer films (14, 16) are stretched across the refe...
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JPS60115001A |
PURPOSE: To prevent the eccentricity by fitting a radiant ray transmitting substrate having a center hole to the center of a metallic part having a projection which is fitted to the center hole of said substrate and injecting simultaneou...
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JPS60111355A |
PURPOSE: To make it possible to transfer micro-ruggedness for recording of a stamper without generating micro-bubbles on a UV resin layer surface by contacting the stamper with pressure at the UV resin layer surface as a transfer layer i...
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JPS60107701A |
PURPOSE: To make holding work and washing process unnecessary by putting a substrate of a replica in a projecting part for centering and pressing it down to center the center hole of the replica simultaneously with supporting of the subs...
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JPS6023014B2 |
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JPS6087447A |
PURPOSE: To obtain a transfer mold of high accuracy by producing a silicone rubber mold with transfer of the disk surface from a glass master disk and casting the transparent liquid resin into said rubber mold by casting method. CONSTITU...
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JPS6018527B2 |
This invention relates generally to a manner of cooling an injection mold assembly which is designed for molding a centrally apertured part such as a video disc. The mold assembly comprises two halves 14, each including a platen 148 whic...
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JPS6079542A |
PURPOSE: To eliminate a defective article from interposing dust in air and the circumference between a metallic mold and a formed film and to obtain a formed article whose accuracy is increased in accordance with a metallic mold, by exec...
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JPS6054272U |
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JPS6026624U |
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JPS6024937A |
PURPOSE: To eliminate troubles with moisture absorptive substance by a method in which a conductive material obtained from mixing pure carbon black with a thermoplastic resin is molded into a disc-shaped molding having an unevenness corr...
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JPS6016332U |
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JPS603683B2 |
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JPS603685B2 |
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JPS603682B2 |
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JPS603684B2 |
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JPS602344A |
PURPOSE: To raise the thermal deformation resistance of an optical resin material by forming an optical resin material from a copolymer composed of cyclohexyl methacrylate, methyl metahcrylate, an aromatic vinyl compound and maleic anhyd...
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JPS59232826A |
PURPOSE: To obtain the base plate for photo disk having no possibility of generating abnormal unevenness on its surface during manufacture and also during recording after manufacture by curing preliminarily a photo curing resin by weak u...
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JPS59227423A |
PURPOSE: To make it possible to easily form a duplicate matrix mold having good mold release characteristics by eliminating a gap into which a duplicate material is penetrated, by integrating attachment jig to a mold and the duplicate mo...
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JPS59224320A |
PURPOSE: To obtain easily a mold for duplicating a disk by a method wherein information is printed on the resist provided on a substrate, developed, then etched and the mold is made by removing the residual resist. CONSTITUTION: An oxida...
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JPS59218822A |
PURPOSE: To prevent resin from hardening in an injecting passage and unhardened resin from remaining on a disk by a strucure wherein the injecting passage of radiation hardening resin can be sealed to radiation without having a movable p...
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JPS59218821A |
PURPOSE: To reduce adhesion of a stamper to resin and to prevent resin from remaining there by proiding an organic film excellent in releasability on the stamper surface (by the use of film preparation due to glow discharge such as plasm...
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JPS5950490B2 |
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JPS59215830A |
PURPOSE: To manufacture a record disc with no change in the sound quality eliminating cutting of a sound groove with a high surface sensitivity by a method wherein a composition mainly made up of a vinyl chloride based resin is subjected...
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JPS59214624A |
PURPOSE: To obtain the titled product in which the carbon is dispersed favorably, by mixing and dispersing a resin that will serve as a matrix, electroconductive carbon black, and various additives in a solvent whose amount is down to th...
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JPS59213043A |
PURPOSE: To obtain a photoresist layer thickness, and exposure and development conditions which are suitable for a mold used for a pre-group master disk by constituting so that both a thickness of a photoresist layer and a thickness of a...
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JPS59210547A |
PURPOSE: To prevent the corrosion of a recording medium by moisture, oxygen, etc. by using glass in the formation of guide signals or guide addresses. CONSTITUTION: Light 7 from Ar laser or the like is irradiated on a resist film 6 coate...
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JPS5948736B2 |
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JPS59209834A |
PURPOSE: To obtain a matrix for duplicating that is excellent in accuracy for transferring a pattern, and high in durability and has a long life, by forming a thin film of a fluorocarbon, a thin film of silicon dioxide and a thin film of...
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JPS59198124A |
PURPOSE: To obtain a recording medium substrate adapted to facilitate the release from a matrix by a method wherein after a replica work, a transparent substrate is placed on the matrix coated with a mold release agent and a light harden...
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JPS59193560A |
PURPOSE: To obtain easily a stamper having excellent performance by forming successively an information transfer layer consisting of a material having high surface hardness and an intermediate layer consisting of a metal by a vacuum film...
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JPS59157219U |
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JPS59186154A |
PURPOSE: To obtain a mother disc from which plural stampers are obtained and where monitoring at laser recording is possible and the shape of pit is excellent by performing prescribed processes after forming sequentially the 1st metallic...
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JPS59185003A |
PURPOSE: To suppress production of noise by forming an organic protecting film on the surface of a record disc to improve the surface strength and the wear resistance. CONSTITUTION: The record disc 1 is arranged in a chamber 5 while bein...
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JPS59153622U |
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JPS59180801A |
PURPOSE: To obtain many master stampers from a sheet of an original disk without giving any damage to the projecting/recessing pattern of the original disk, by applying the conductivity and plating to the surface of a polymer replica and...
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JPS59178636A |
PURPOSE: To obtain an optical disk having little optical strain and high durability with superior transfer efficiency by coating a specified ultraviolet curing resin on a stamper, covering the coated surface with an injection molded plat...
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JPS59177742A |
PURPOSE: To obtain a long life without deterioration in a mold release property in the stage of reproducing an information recording carrier by covering the surface for holding information with a metallic film having excellent resistance...
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JPS5935423Y2 |
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JPS59171629A |
PURPOSE: To produce a bubble-free replica by using a flat stamper mold at the copying time of disc by a method in which a resin stamper is made of an ultraviolet rays-curable resin, and by using the stamper, a replica with an undercoat i...
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JPS59171004A |
PURPOSE: To obtain a stamper which generates no distortion of sound grooves nor ghost by providing a thermoplastic resin layer on the rear side of the stamper on which a projecting bar corresponding to information recording grooves is fo...
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JPS59171003A |
PURPOSE: To obtain a stamper which generates no distortion of sound grooves nor ghost by forming the rear side of the stamper on which a projecting bar corresponding to information recording grooves is formed, as a smooth ground surface ...
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JPS59171002A |
PURPOSE: To obtain a stamper which generates no distortion of sound grooves nor ghost by providing a plating layer on the rear side of the stamper on which a projecting bar corresponding to information recording grooves is formed, and fo...
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