Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2006-11-06

2010-02-23

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, C369S112160

Reexamination Certificate

active

07668066

ABSTRACT:
An optical pickup apparatus for information recording and/or reproduction on different optical information recording media with compatibility among these media, the optical surface of a first objective lens and the optical surface of a second objective lens are formed only of a refractive surface. The second objective lens is used in common for the first light flux with a wavelength of λ1and the second light flux with a wavelength of λ2,but in the case where the protective substrate t2of the second optical information recording medium and the protective substrate t3of the third optical information recording medium are the same, it is not necessary to take the difference in thickness of the protective substrate into consideration. Chromatic aberration based on the difference in wavelength between the first light flux and the second light flux can be corrected by displacing the second coupling lens.

REFERENCES:
patent: 2004/0213131 (2004-10-01), Kimura et al.
patent: 2006/0002247 (2006-01-01), Kim et al.
patent: 2006/0007812 (2006-01-01), Nishi et al.

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