Optical element and optical pickup device

Details Optical element and optical pickup device Optical element and optical pickup device

2011-07-26

2011-07-26

Chow, Lixi (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112220, C369S112230

Reexamination Certificate

active

07986604

ABSTRACT:
An objective lens causes birefringence, which causes wave aberration in outgoing light from the objective lens. A coated objective lens has a dielectric multilayer film that can reduce astigmatism component of the wave aberration to 5 mλ rms or smaller when 10 mλ rms or larger astigmatism component of wave aberration is generated.

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Office Action and English-language translation thereof regarding corresponding Chinese patent application 2007800454962, Office Action mailed on Aug. 11, 2010, 13 total pages.

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