Optical pickup apparatus and objective optical element

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

2005-09-09

2010-10-26

Ortiz Criado, Jorge L (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S044370

Reexamination Certificate

active

07821904

ABSTRACT:
A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and the second phase structure, a light flux from the second light source forms a converged spot on second optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure, and a light flux from the third light source forms a converged spot on third optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure.

REFERENCES:
patent: 2004/0047269 (2004-03-01), Ikenaka et al.
patent: 2004/0257958 (2004-12-01), Kimura et al.
patent: 1 304 689 (2003-04-01), None

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