| 摘要 |
PROBLEM TO BE SOLVED: To provide a wave length plate for optical information recording/reproducing apparatus, the plate having excellent initial characteristics and long-term reliability hardly influenced by the use environment or the manufacturing environment. SOLUTION: The wave plate comprises two or more retardation films, in which retardation films are not adhered to each other in a part where laser light transmits. COPYRIGHT: (C)2005,JPO&NCIPI
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