Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-01-30
2007-01-30
Psitos, A M (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112070, C369S044230
Reexamination Certificate
active
10893969
ABSTRACT:
In an optical pick-up apparatus for recording to or reproducing from an optical information recording medium, the optical pick-up apparatus includes: a light source for emitting light flux; a light converging optical system having an aperture and an objective lens and converging the light flux emitted from the light source on the optical information recording medium; a photodetector for detecting light reflected from the optical information recording medium; and a driving section for driving the objective lens and the aperture in association with the objective lens. A non-parallel light is incident on the objective lens, the light converging optical system includes a first part and a second part which is more apart from an optical axis of the light converging optical system than the first part, and the light flux passed through the first part is converged on an information recording surface of the optical information recording medium through a transparent substrate of the optical information recording medium so that a wavefront aberration on the information recording surface is not more than 0.07 λ rms, and the light flux passed through the second part generates a spherical aberration.
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Konica Corporation
Psitos A M
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