Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1988-07-29
1991-04-23
McElheny, Jr., Donald
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 1552, G11B 2722
Patent
active
050105400
ABSTRACT:
An apparatus for recording and reproducing information on and from an optical disk includes a first control for producing a first control signal for controlling the rotational speed of a rotational driving apparatus, on the basis of the detected radial position; a judging apparatus which judges whether or not the reproduced signals are reproduced from a recorded region of the optical disk; a second control for producing a second control signal for controlling the rotational speed of the rotational driving apparatus, on the basis of the signals reproduced from the disk; and a switch apparatus which switches the circuit so that the rotational driving apparatus is controlled by the first control signal when the reproduced signals are not reproduced from a non-recorded region, and controlled by the second control signal when the reproduced signals are reproduced from a recorded region.
REFERENCES:
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patent: 4390977 (1983-06-01), Onigata et al.
patent: 4404604 (1983-09-01), Ueki et al.
patent: 4672595 (1987-06-01), Senso
patent: 4757488 (1988-07-01), Nagai et al.
patent: 4766502 (1988-08-01), Mashimo
Deguchi Toshihisa
Fuji Hiroshi
Fujiwara Tsuneo
Iwaki Takashi
Kojima Kunio
McElheny Jr. Donald
Sharp Kabushiki Kaisha
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