Optical element and optical pickup apparatus

Details Optical element and optical pickup apparatus Optical element and optical pickup apparatus

2011-07-12

2011-07-12

Teskin, Fred M (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C264S001320, C264S001330, C264S002600, C369S112230

Reexamination Certificate

active

07977440

ABSTRACT:
A production method of an objective lens for optical pickup apparatus having a numerical aperture NA of image side of 0.80 to 0.90 is disclosed. The method includes steps of molding resin composition containing copolymer of α-olefin and a cyclic olefin represented by Formula (I) or (II) to form lens shape, and thermally processing the molded product under a condition at a temperature between Tg −45° C. and Tg −15° C. for 12 to 168 hours, wherein the Formula (I) and (II) is detailed in the specification.

REFERENCES:
patent: 2002-105131 (2002-04-01), None
patent: 2005-306009 (2005-11-01), None
patent: 2006-143927 (2006-06-01), None
Machine Translation of JP 2005-306009; publication date: Nov. 2005.
Machine Translation of JP 2006-143927; publication date: Jun. 2006.

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