Optical device for optically recording and reproducing informati

Details Optical device for optically recording and reproducing informati Optical device for optically recording and reproducing informati

1982-07-12

1985-03-26

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, 369 44, 369 46, 369110, G11B 712

Patent

active

045077665

ABSTRACT:
An optical device for optically recording and reproducing information in and out of a recording medium. The device consists of a movable optical system which carries out at least two-dimensional movements and a stationary optical system. The movable optical system includes a beam splitter adapted to receive a parallel light beam, an objective lens for focussing the light beam from the second beam splitter onto the medium and a photodetector disposed in the vicinity of the beam splitter and adapted to receive, through the objective lens and the beam splitter, the light beam reflected by the information carrier. The stationary optical system includes a beam splitter for directing the parallel light beam from the source to the beam splitter of the movable optical system and a photodetector for receiving the reflected light beam coming through the beam splitter. The photodetector of the movable optical system provides at least a tracking control signal while the photodetector of the stationary optical system provides at least a focussing control signal.

REFERENCES:
patent: 3962688 (1976-06-01), Westerberg
patent: 4408314 (1983-10-01), Yokota

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