Objective lens, optical pickup apparatus and optical...

Details Objective lens, optical pickup apparatus and optical... Objective lens, optical pickup apparatus and optical...

2011-06-07

2011-06-07

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

07957249

ABSTRACT:
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.

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European Search Report dated Nov. 6, 2008.
Office Action in related U.S. Appl. No. 11/348,477, mailed Apr. 24, 2009.

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