Optical recording medium with trays located so that multiple tra

Details Optical recording medium with trays located so that multiple tra Optical recording medium with trays located so that multiple tra

1994-09-15

1996-09-17

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692751, 3692753, 369124, 369107, G11B 7007

Patent

active

055576001

ABSTRACT:
An apparatus for playback of an optical recording medium where data are recorded after combined calculation of a difference signal and a sum signal generated by detecting reference patterns and the return light reflected from the optical recording medium. The recording medium has tracks formed at such a pitch that at least two tracks are scanned simultaneously by a spot of a light beam irradiated onto the recording surface. Each track has data composed of wobble pits formed at positions deviated from the track center and a multiplicity of pits formed exactly on the track center, wherein the multiple pits and the wobble pits are disposed successively. The apparatus comprises an optical detector and a signal discriminator. The optical detector has first and second adjacent light receiving areas divided along the tangential direction of the tracks and serving to receive the return light reflected from the optical recording medium. The signal discriminator comprises a subtracter for calculating the difference between the output detection signals of the first and second light receiving areas, and an adder for calculating the sum of such output detection signals. The signal discriminator discriminates the recorded data of the optical recording medium in accordance with the result of the combined calculation of the difference signal and the sum signal obtained respectively from the subtracter and the adder.

REFERENCES:
patent: 5018123 (1991-05-01), Hosoya et al.
patent: 5193081 (1993-03-01), Osawa et al.
patent: 5214629 (1993-05-01), Watanabe
patent: 5255263 (1993-10-01), Van Uijen et al.
patent: 5347504 (1994-09-01), Ito et al.
patent: 5416766 (1995-05-01), Horimai
Patent Abstracts of Japan, vol. 13, No. 387 (P-924), 28 Aug. 1989 & JP-A-01 134 728 (NEC Corp.).
Patent Abstracts of Japan, vol. 9, No. 76 (P-346), 5 Apr. 1985 & JP-A-59 207 433 (Sony KK).

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