Optical type disc with V-shaped groove and optical type reproduc

Details Optical type disc with V-shaped groove and optical type reproduc Optical type disc with V-shaped groove and optical type reproduc

1985-08-08

1987-06-16

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369111, 369275, 369109, G11B 7007

Patent

active

046740708

ABSTRACT:
An optical type disc is recorded with information signals on each sloping surface of a spiral or concentric V-shaped grooves formed on a recording surface thereof, wherein the information signals are recorded as rows of geometrical depressions or projections on each sloping surface of the V-shaped groove and the inclination angle of the bottom surface of the depression or the top surface of the projection is greater than the inclination angle of the sloping surface of the V-shaped groove. An optical type reproducing apparatus reproduces the signals from the disc by relatively scanning the sloping surface of the V-shaped groove by a reproducing spot having a diameter smaller than the width of the V-shaped groove. The reproducing apparatus comprises tracking spot forming system for forming a tracking spot across two mutually adjacent sloping surfaces of the V-shaped grooves at a position deviated with respect to the reproducing spot in a width direction of the V-shaped groove by a distance of 1/4 the width of the V-shaped groove, a photoelectric transducer for independently receiving light reflected from the two mutually adjacent sloping surfaces of the V-shaped grooves, and a moving mechanism for moving an optical system in the width direction of the V-shaped groove responsive to an output of the photoelectric transducer so that the reproducing spot is formed along a predetermined sloping surface of the V-shaped groove.

REFERENCES:
patent: 4037252 (1977-07-01), Janssen
patent: 4310916 (1982-01-01), Dil
patent: 4325135 (1982-04-01), Dil et al.
patent: 4553228 (1985-11-01), Gerard et al.
patent: 4569038 (1986-02-01), Nagashima et al.
"High Density Optical Disk With V-Shaped Grooves", by Nagashima, Appl. Phys. Lett., vol. 42, No. 2, Jan. 15, 1983.
"Experimental Estimation of an Optical Disk System With V-Shaped Grooves", by Nagashima et al., Appl. Phys. Lett., vol. 43, No. 1, Jul. 1, 1983.
"High Density Optical Disk With V-Shaped Grooves", by Nagashima et al., 13th Optical Engineering Conference.

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