Optical pickup apparatus, objective optical element and...

Details Optical pickup apparatus, objective optical element and... Optical pickup apparatus, objective optical element and...

2011-05-24

2011-05-24

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

07948857

ABSTRACT:
An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting-a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. The optical pickup apparatus provides a wavelength dependency of a spherical aberration so as to correct a change in a spherical aberration due to a refractive index change with a temperature change of the objective optical element.

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patent: 2005/0083562 (2005-04-01), Hendriks
patent: 2005/0237898 (2005-10-01), Kimura
patent: 1 521 248 (2005-04-01), None
patent: 1 580 737 (2005-09-01), None
patent: 1 596 383 (2005-11-01), None
European Search Report dated Mar. 25, 2009.

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