Optical disk reproducing apparatus for reading a track by irradi

Details Optical disk reproducing apparatus for reading a track by irradi Optical disk reproducing apparatus for reading a track by irradi

1994-08-25

1996-06-04

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, G11B 700

Patent

active

055239927

ABSTRACT:
An optical disk is provided, on which a light spot is formed by projecting a light beam to optically reproduce information recorded on the optical disk by receiving a light from the light spot by use of a photodetector having two divided light receiving surfaces. The optical disk includes: a disk-shaped information recording member having an information recording surface; a track formed on the information recording surface, disposed along a circular direction of the optical disk, and having track pitch smaller than the diameter of the light spot; and a plurality of pits arranged on the track and modulated by the information recorded on the information recording surface. The pits have parameters determined as functions of the wavelength, the numerical aperture, and the track pitch such that the light from the light spot covering two adjacent turns of the track is detected to be a DC component signal by one of the two divided light receiving surfaces of the photodetector.

REFERENCES:
patent: 4310916 (1982-01-01), Dil
patent: 4325135 (1982-04-01), Dil et al.
patent: 4455632 (1984-06-01), Braat
patent: 4674070 (1987-06-01), Tajima et al.
patent: 5060214 (1991-10-01), Nakayama et al.
patent: 5247504 (1993-09-01), Akatsuka

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