Optical system for recording and reproducing for use in optical

Details Optical system for recording and reproducing for use in optical Optical system for recording and reproducing for use in optical

1999-06-15

2000-04-11

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

060495197

ABSTRACT:
An optical system for recording or reproducing of information to or from an optical information recording medium, includes a light source, a coupling lens for converting a diverging light emergent from the light source to a converging light, and an objective lens for further converging the converted converging light and for focusing on an information recording surface of the optical information recording medium. A lateral magnification M.sub.c of the coupling lens on an image side for a light source side and a numerical aperture NA.sub.o on the light source side of the coupling lens satisfy the following expressions respectively, -7.0.ltoreq.M.sub.c .ltoreq.-0.5 and 0.06.ltoreq.NA.sub.o .ltoreq.0.21.

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