Optical recording and reproducing apparatus

Details Optical recording and reproducing apparatus Optical recording and reproducing apparatus

1987-09-04

1989-01-10

Sikes, William L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 44, 369112, 369121, 358342, G11B 700

Patent

active

047978708

ABSTRACT:
An optical recording and reproducing apparatus comprises an optical disc having a recording surface; a laser diode emitting a laser beam; an optical lens for changing the laser beam into a parallel laser beam; a diffraction grating for diffracting the parallel laser beam and generating 0-order and .+-.1st diffracted lights, a light intensity ratio of each of the .+-.1st diffracted lights to the 0-order diffracted light ranging from 8:1 to 9:1; and an optical system for forming spot lights of the 0-order and .+-.1st diffracted lights on the recording surface of the disc and extracting the 0-order and .+-.1st diffracted lights which have been reflected from on the recording surface.

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