Optical disc recording/reproducing apparatus with recorded track

Details Optical disc recording/reproducing apparatus with recorded track Optical disc recording/reproducing apparatus with recorded track

1985-12-05

1987-08-25

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 54, 369 44, 360 721, 360 78, G11B 1904, G11B 7085, G11B 7095

Patent

active

046897780

ABSTRACT:
In the case where an information signal is optically recorded on the tracks of a disc-like recording medium, the apparatus of the invention confirms that no information signal is recorded on the track prior to recording the information signal in order to prevent the overlap recording of the information signal. This apparatus has a track jump pulse generating circuit and an RF signal detecting circuit and the light spot sequentially moves to the adjacent tracks by a plurality of times during one rotation of the track. The presence or absence of an RF signal is detected from each track and the presence or absence of the recorded track is checked at a high speed.

REFERENCES:
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patent: 4550393 (1985-10-01), Sugiyama et al.
patent: 4580253 (1986-04-01), Yoshidome
patent: 4598394 (1986-07-01), Nonaka
patent: 4606016 (1986-08-01), Verboom et al.
patent: 4615023 (1986-09-01), Inada et al.
Hashimoto, "Recorder or Reproducer", Patents Abstracts of Japan, vol. 8, No. 179, 8/84.
Yamashita, "Optical Disc Reproducer", Patents Abstracts of Japan, vol. 17, No. 241, 10/83.
Deguchi, "Optical Type Recorder and Reproducer", Patents Abstracts of Japan, vol. 6, No. 252, 12/82.
Yamaguchi, "Optical Disk Device", Patents Abstracts of Japan, vol. 8, No. 121, 6/84.
Yoshida, "Optical Recording and Reproducing Unit", Patents Abstracts of Japan, vol. 4, No. 142, 10/80.
Hirasawa, "Optical Recording and Reproducing Device", Patents Abstracts of Japan, vol. 7, No. 10, 1/83.

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