Objective lens for an optical pickup apparatus

Details Objective lens for an optical pickup apparatus Objective lens for an optical pickup apparatus

2007-03-12

2010-06-08

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

07733758

ABSTRACT:
An objective lens for use in an optical pickup apparatus, comprises an objective lens satisfying the following expression: 0.01≦|δSA3obj/δλ|<0.1 (λrms
m), where δSA3obj/δλ represents the wavelength dependency of the 3rd order spherical aberration of the objective lens when the oscillation wavelength is fluctuated between ±2 nm.

REFERENCES:
patent: 6366542 (2002-04-01), Kojima et al.
patent: 2004/0047040 (2004-03-01), Ota et al.
patent: 2004/0080831 (2004-04-01), Kimura
patent: 2007/0177481 (2007-08-01), Kimura et al.

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