Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

2011-03-08

2011-03-08

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020

Reexamination Certificate

active

07903528

ABSTRACT:
An optical pickup apparatus for conducting recording and/or reproducing information for a first optical information recording medium including at least a transparent protective substrate, a first information recording surface, and a second information recording surface which are laminated in this order from a light source side along an optical axis, comprising:a first light source to emit a light flux having a wavelength of λ1(380 nm≦λ1≦450 nm);an objective lens to converge the light flux onto the first optical information recording medium;a spherical aberration correcting structure to correct a spherical aberration caused in a converged spot on the first and second information recording surfaces due to a difference in thickness between the thickness to the first information recording surface and the thickness to the second information recording surface.

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Abstract of JP 2000-285500 (Konica Corp.).

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