Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2007-03-01

2009-12-22

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112050, C369S112250

Reexamination Certificate

active

07636291

ABSTRACT:
The present invention provides an optical pickup apparatus including a first light source, a second light source, a third light source, and a light-converging optical system including an objective lens. The objective lens includes at least one optical surface with a diffractive structure. The diffractive structure includes a plurality of ring shaped zones. Each of the ring shaped zones is concentrically arranged around an optical axis and includes a step difference extending along the optical axis. In the objective lens, the predetermined conditions according to the offence against a sine condition, an average of step differences of the plurality of ring shaped zones, a focal length, and a magnification, are satisfied.

REFERENCES:
patent: 2004/0213136 (2004-10-01), Arai et al.
patent: 2005/0111337 (2005-05-01), Hatano et al.
patent: 2005-209250 (2005-08-01), None

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