Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1983-12-23
1986-12-16
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 33, 369 46, G11B 700
Patent
active
046302522
ABSTRACT:
An optical disc player for optically recording the video information or audio information onto a recording medium or optically reproducing the recorded information. The disc player includes a search unit for searching an information track having no signals recorded thereon prior to additionally recording an information signal on the unrecorded track. The search unit has a level detection circuit for detecting the energy value of the light reflected by the recording medium or an RF signal detection circuit for detecting the RF signal component. When the reflected light energy exceeds a predetermined value or the RF signal component is not detected, the search unit regards the track as a track having no signals recorded thereon, the search operation for a track having no signals being terminated and information can be recorded of the track having no signals recorded thereon.
REFERENCES:
patent: 4317190 (1982-02-01), Iyeta
patent: 4520469 (1985-05-01), Todokoro et al.
Fujishima Tooru
Kawashima Tooru
Kudo Yoshimichi
Miura Yoshio
Oku Masuo
Hitachi , Ltd.
Richardson Robert L.
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