Floppy disk apparatus

Details Floppy disk apparatus Floppy disk apparatus

2006-04-04

2006-04-04

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C318S696000

Reexamination Certificate

active

07023653

ABSTRACT:
A floppy disk apparatus improves power efficiency and quietness by commencing rotation of a stepping motor in a smooth fashion. The floppy disk apparatus includes an interface control circuit that outputs, in accordance with an instruction from a host apparatus, a first step pulse signal, step pulse period signals that indicate the period of the first step pulse signal and that are output before the first step pulse signal and a direction signal, and a floppy disk control circuit that generates a second step pulse signal delayed by a predetermined time from the first step pulse signal in accordance with the step pulse period signal, that generates a first signal that toggles in synchronization with the first step pulse signal and a second signal that toggles in synchronization with the second step pulse signal, and that outputs the first and second signals as control signals in accordance with the direction signal.

REFERENCES:
patent: 4489259 (1984-12-01), White et al.
patent: 4612588 (1986-09-01), Tsukahara
patent: 5264771 (1993-11-01), Kawauchi
patent: 6057978 (2000-05-01), Hayakawa
patent: 2002/0054452 (2002-05-01), Kato et al.
patent: 09-261997 (1997-10-01), None
patent: 11-306501 (1999-11-01), None
patent: 2000-311422 (2000-11-01), None

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