Manufacturing method of optical information recording medium

Details Manufacturing method of optical information recording medium Manufacturing method of optical information recording medium

2002-05-31

2010-10-26

Fletcher, III, William Phillip (Department: 1715)

Coating processes

Optical element produced

C427S508000, C427S240000, C427S407100

Reexamination Certificate

active

07820234

ABSTRACT:
A method of manufacturing an optical information recording medium to/from which signals can optically be recorded and reproduced. The recording medium includes a signal substrate (100), a signal recording layer (110), and a transparent cover layer (125) having a first transparent layer (115) and a second transparent layer (120), which is harder than the first transparent layer (115). Signals can be recorded and reproduced to and from the recording medium by a light transmitted to the signal recording layer through the transparent cover layer (125). The first transparent layer is formed so as to have a first predetermined distribution of thickness. The second transparent layer is formed so as to have a second predetermined distribution of thickness to make the total thickness of the transparent cover layer (125) uniform. The first transparent layer (115) may be made of a plurality of thin laminated transparent layers.

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