Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1981-02-23
1983-10-04
Stellar, George G.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
G11B 700, G11B 1902, G11B 2110
Patent
active
044083149
ABSTRACT:
A single laser beam emitted from a laser generator driven by a laser driver in a record mode is alternately switched between a recording beam with large power and a tracking beam with small power. The switched beam is focused onto an optical disc through a laser beam transmitting section and then is reflected from the optical disc. The reflected laser beam from the optical disc is received by a pair of photo detecting elements in a two-divided way. Pulsate signal components with peaks corresponding to the recording beam contained in the output signals produced from the photo detecting elements are removed by sample-hold circuits in a wave-shaping section. A level difference between the output signals from the wave-shaping section is detected by a differential amplifier. The output signal from the differential amplifier, that is, a tracking control signal, drives a drive section to move an optical head.
REFERENCES:
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4243848 (1981-01-01), Utsumi
patent: 4243850 (1981-01-01), Edwards
patent: 4310912 (1982-01-01), Kikuchi et al.
Stellar George G.
Tokyo Shibaura Denki Kabushiki Kaisha
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