Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-01-29
1997-04-01
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369111, 3692754, 2502015, G11B 709
Patent
active
056173890
ABSTRACT:
An optical disc has a recording surface on which a spiral track having a predetermined track pitch is formed. A plurality of information units are formed on the track each of which has a predetermined unit length in a circumferential direction and a radial direction of the optical disc respectively. The information is converted in a shape and a disposed position of an information pit, which is formed in each of the plurality of information units. A method of reproducing the information includes the steps of: irradiating a reading light to form a light spot on the information pit; detecting an outer light portion, which corresponds to an outer circumferential side domain, among a reflective light shaped in a spot from the information pit, which is projected on an imaginary plane including a light receiving surface of a light detecting apparatus to output a light detection signal indicating the detected outer light portion; and reproducing the information on the basis of the light detection signal.
REFERENCES:
patent: 4585933 (1986-04-01), Ando
patent: 4742218 (1988-05-01), Nakamura et al.
patent: 5357499 (1994-10-01), Nomoto
patent: 5359591 (1994-10-01), Nomoto
Nakajima Hiroyuki
Satoh Makoto
Pioneer Electronic Corporation
Tran Thang V.
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