Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1984-05-14
1987-02-17
Richardson, Robert L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 33, 369 43, 369 57, 369 52, G11B 2102
Patent
active
046445145
ABSTRACT:
A head drive control apparatus has a head and a scale reader. When the head is moved by a head drive mechanism, the scale reader detects the marks on a scale and converts them into a scale signal. In a speed control mode, the scale signal is compared with a target signal by an access signal generator, which produces an access signal representing the difference between the compared signals. The head is moved in accordance with the access signal until the scale signal becomes identical with the target signal. When these signals become equal, the speed control mode is switched to a position control mode. In the position control mode, a scale signal generator, a pulse generator, an up/down counter, a D/A converter, an adder and an interpolator convert the scale signal into an analog signal which represents the position of the head. The analog signal is compared with a position designating signal by a differential amplifier. The head is moved in accordance with the output signal of this amplifier.
REFERENCES:
patent: 3721882 (1973-03-01), Helms
patent: 4355273 (1982-10-01), Du Vall
patent: 4481613 (1984-11-01), Yokota
patent: 4513406 (1985-04-01), Ishihara
patent: 4532621 (1985-07-01), Nakagawa
Ohshima Ken
Okada Hiroo
Sakamoto Masaharu
Olympus Optical Co,. Ltd.
Richardson Robert L.
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