Optical pickup apparatus objective lens and converging optical s

Details Optical pickup apparatus objective lens and converging optical s Optical pickup apparatus objective lens and converging optical s

1996-12-09

1998-05-26

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, G11B 700

Patent

active

057577587

ABSTRACT:
An optical pickup apparatus includes: a laser light source; a light converging optical system for converging a light beam emitted from the laser light source onto a first information recording surface of a first optical information recording medium having a thickness t1 of a transparent substrate, or a second information recording surface of a second optical information recording medium having a thickness t2 of a transparent substrate. The light converging optical system has a best fit wavefront aberration of 0.07 .lambda. rms or less at a numerical aperture of NA1 when the thickness t1 of the transparent substrate is used, and has a best fit wavefront aberration of 0.07 .lambda. rms or less at a numerical aperture of NA2 when the thickness t2 of the transparent substrate is used, where NA1 represents a numerical aperture on a side of the first optical information recording medium in the light converging optical system when the light beam emitted from the laser light source is converged as a light spot to be read out, NA2 represents an effective numerical aperture on a side of the second optical information recording medium in the light converging optical system when the light beam emitted from the laser light source is converged as a light spot to be read out, and .lambda. represents a wavelength of the light beam emergent from the laser light source. The optical pickup apparatus further includes a light detector for detecting light reflected from the first or second information recording surface.

REFERENCES:
patent: 4449792 (1984-05-01), Arai et al.
patent: 5161063 (1992-11-01), Krill et al.

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