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Inventor
HIRAO KEIKO
JP
2 patents
Patents
2 patents
US7855940B2
Dec 21, 2010
Pickup lens with phase compensator and optical pickup apparatus using the same
HITACHI MAXELL
0 citations
45
US7586815B2
Sep 8, 2009
Pickup lens with phase compensator and optical pickup apparatus using the same
HITACHI MAXELL
0 citations
45