Optical recording medium and apparatus for playing such a medium

Details Optical recording medium and apparatus for playing such a medium Optical recording medium and apparatus for playing such a medium

1992-05-21

1994-12-27

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 45, 428913, 346 76L, 3461351, 369788, B32B 300

Patent

active

053764226

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 device which generates reading 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: 4956214 (1990-09-01), Imataki et al.
patent: 5018123 (1991-05-01), Hosoya et al.

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