Optical disc with phase pits and a reproducing apparatus for dat

Details Optical disc with phase pits and a reproducing apparatus for dat Optical disc with phase pits and a reproducing apparatus for dat

1993-10-19

1996-07-30

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, G11B 724

Patent

active

055419097

ABSTRACT:
A masking type light control layer for decreasing its reflection factor in a high-temperature region is formed on phase pits of an optical disc, and the phase pit depth is set to a predetermined value. A light spot for reproduction is shaped to an elliptical form and two sub-flux beams on the optical disc are spaced by 5/4 track pitch from a principal flux beam in the radial direction of the optical disc. The kind of optical disc is discriminated and reproduction laser power and characteristics of an equalizer circuit are switched in accordance with the type of an optical disc. Through this, a stable servo signal detection can be ensured and repetitive reproduction characteristics can be improved.

REFERENCES:
patent: 5199022 (1993-03-01), Suzuki et al.
"Superresolution Optical Head Technics", O plus E, 1992-9 No. 154, pp. 81-83 Sep. 5, 1992, New Technical Communications Ltd.

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