Apparatus for playing optical recording medium with combination

Details Apparatus for playing optical recording medium with combination Apparatus for playing optical recording medium with combination

1994-09-20

1995-07-04

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4441, G11B 709

Patent

active

054307007

ABSTRACT:
An optical recording medium in which tracks are constructed by a plurality of combination tracks and-the distance between tracks is narrowed so that data is recorded at a high density, and a playing apparatus for such a medium. The recording medium has a plurality of combination tracks whose track pitch is smaller than a spot diameter of a reading beam of an optical pickup. A track gap which is larger than an optical cut-off wavelength of the optical pickup and is larger than the track pitch is provided for each combination track. The playing apparatus includes a reading which generates beam spots which are equal in number to the tracks constructing the combination track of the recording medium, and a tracking error detecting section for detecting a level difference between two reading signals obtained from tracks at both inner and outer peripheries of the combination track by the reading means, thereby detecting a tracking error.

REFERENCES:
patent: 4290122 (1981-09-01), Bates et al.
patent: 4875203 (1989-10-01), Takamura et al.
patent: 4956214 (1990-09-01), Imataki et al.
patent: 5018123 (1991-05-01), Hosoya et al.
patent: 5184340 (1993-02-01), Kachi et al.
Patent Abstracts of Japan, vol. 10, No. 225, p. 484, Aug. 6, 1986, & JP 61-061236.
Patent Abstractsof Japan, vol. 6, No. 241, P158, Jan. 25, 1982, & JP 57-141032.

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