Optical and reversible recording and reproducing apparatus

Details Optical and reversible recording and reproducing apparatus Optical and reversible recording and reproducing apparatus

1983-10-12

1986-01-21

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

346 76L, 365113, 369111, 369116, 369122, 369275, G11B 700

Patent

active

045660883

ABSTRACT:
An optical and reversible recording and reproducing apparatus providing a practical apparatus in which information signals can be recorded, reproduced and erased by irradiating a laser beam and the like on the substrate to be optically recorded. More practically, there is provided such an apparatus wherein two light sources such as lasers having different wavelengths are used, and a first almost circular micro-lightspot is produced by one light source, while a second elliptic light spot having a longitudinal diameter in the tangential direction of a guide track on a disc is produced by the other light source. These first and second light spots are closely irradiated on one and the same guide track of an optical recording disc. The recording and reproducing of the signals are performed using the first light spot while the erasure of the recorded signals can be made by using the second light spot or using both first and second light spots in combination.

REFERENCES:
patent: 4264986 (1981-04-01), Willis
patent: 4383261 (1983-05-01), Goldberg
patent: 4403318 (1983-09-01), Nagashima et al.

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