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US 6,190,748 B1Granted
Optical discs
AssigneeDisctronics Manufacturing, Inc.
InventorsMiguel Nunes Xavier, Martin John Goldman
Life of this patent
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AssigneeDisctronics Manufacturing, Inc.
InventorsMiguel Nunes Xavier, Martin John Goldman
Estimating the term…
A method of manufacturing an optical disc master includes preparing the surface of a glass master plate (2) with an adhesion promoter 4. A photoresist layer (6) is coated on the adhesion promoter (4). This photoresist layer (6) is subjected to a first exposure of a modulated laser beam (8) to produce an exposed photoresist layer (10) corresponding to the modulation information of the laser beam (8). A transparent sheet (16) is placed on the photoresist layer (6). This sheet (16) contains a distinguishing mark to be located in the optical disc. White light (18) from a second light source is passed through the sheet (16) onto the photoresist layer (6) to expose the upper surface of this layer (6). The exposed part of this upper surface provides a pattern (22) corresponding to the mark on the sheet (16). The exposed master plate (2) is then developed to form the pits (12) and a reproduction (24) of the pattern (22).
A method of manufacturing an optical disc master comprising preparing the surface of a glass master plate, applying a photoresist layer to this prepared surface, subjecting the photoresist layer to a first exposure of a modulated laser beam to produce an exposed first pattern corresponding to the modulation information of the laser beam, locating a distinguishing mark in the path of light from a white light source, directing light from the white light source onto the previously exposed surface of the photoresist layer after locating the distinguishing mark to locate an exposed second pattern on the previously exposed surface corresponding to said distinguishing mark.
A method of manufacturing an optical disc master comprising preparing the surface of a glass master plate, applying a photoresist layer to this prepared surface, subjecting the photoresist layer to a first exposure of a modulated laser beam to produce an exposed first pattern corresponding to the modulation information of the laser beam, locating a distinguishing mark in the path of light from a white light source, directing light from the white light source onto the previously exposed surface of the photoresist layer after locating the distinguishing mark to locate an exposed second pattern on the previously exposed surface corresponding to said distinguishing mark including placing a transparent sheet with the distinguishing mark in contact with the surface of the photoresist layer and passing a tubular, approximately 300 watt white light across the photoresist layer at approximately 0.5 meters per second.
Dependencies are inferred from the claim text.