Optical system for recording and/or reproducing an optical infor

Details Optical system for recording and/or reproducing an optical infor Optical system for recording and/or reproducing an optical infor

1997-03-26

1998-10-06

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 7135

Patent

active

058188096

ABSTRACT:
An optical system for recording or reproducing information in an optical information recording medium, includes: a light source having a wavelength .lambda. thereof; an objective lens; tracking device for tracking the objective lens by moving the objective lens in a direction perpendicular to an optical axis of the optical system; and a coupling lens optical system including at least one plastic lens and having a positive focal length, and being provided between the light source and the objective lens for guiding a light emitted from the light source to the objective lens. A maximum amount of change in a wavefront aberration of the coupling lens optical system in a numerical aperture corresponding to a maximum amount of tracking is 0.02 .lambda.rms or less.

REFERENCES:
patent: 5475537 (1995-12-01), Kobayashi et al.

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