Optical recording and retrieving disc

Details Optical recording and retrieving disc Optical recording and retrieving disc

1982-10-07

1985-10-15

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369109, G11B 700

Patent

active

045478759

ABSTRACT:
An optical disc for optical recording, retrieving and erasing of informations. The phase difference .psi. of reflected light produced by the tracking groove in the form of convexity or protrusion of concavity or groove and the change .DELTA..psi. in the phase difference caused by a recording in a recording film are selected in relation to each other to provide a stable detection signal for tracking, thereby to permit a highly accurate tracking on the optical disc carrying information at a high density.

REFERENCES:
patent: 4209804 (1980-06-01), Dil
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4310910 (1982-01-01), Sheng
patent: 4310916 (1982-01-01), Dil
patent: 4325135 (1982-04-01), Dil et al.
patent: 4359750 (1982-11-01), Howe
patent: 4423502 (1983-12-01), Dil
Ping Sheng, "Theoretical Considerations of Optical Diffraction from RCA Videodisc Signals", RCA Review, vol. 39, Sep. 1978, pp. 512-531.
"Electronik 1978" vol. 27, No. 15, pp. 31-34.

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