Retardation compensating light beam guiding system in an optical

Details Retardation compensating light beam guiding system in an optical Retardation compensating light beam guiding system in an optical

1985-09-04

1988-03-08

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369107, 369112, G11B 700

Patent

active

047302976

ABSTRACT:
An optical storage medium drive apparatus having a light beam source for recording information on an optical storage medium and reading out the recorded information from the storage medium by using a light beam. The apparatus has an optical head in which the light source is included for emitting a light beam, and a light detector for converting reflected light from the storage medium into an electric signal and an optical system for guiding the light beam from the light source to the optical storage medium and a reflected light beam from the optical storage medium to the light detector. The optical system has therein a light reflector for changing the direction of the light beam and which causes retardation of the light. An optical phase compensator is disposed on the optical path between the optical head and the optical storage medium for compensating for retardation of the light beam caused by the reflector.

REFERENCES:
patent: 3898629 (1975-08-01), Westerberg
patent: 4005935 (1977-02-01), Wang
patent: 4310910 (1982-01-01), Sheng

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