Speed detection apparatus, speed control motor, and track jump c

Details Speed detection apparatus, speed control motor, and track jump c Speed detection apparatus, speed control motor, and track jump c

1994-10-17

1996-05-28

Chin, Tommy P.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4435, 369 4425, 369 58, 369 43, 360 7702, 360 7806, 360 7804, 318560, G11B 700

Patent

active

055218911

ABSTRACT:
A track jump control circuit comprises: a head; a rotary motor which drives the head and is controlled in accordance with an input signal; a unit for detecting a speed of rotation corresponding to the rotation of the rotary motor; distance detection unit for producing a signal corresponding to a distance which the head should move with using no data read by the head when the head is moved to a desired position; speed setting unit for setting a speed of movement of the head based on the signal produced by the distance detection unit; and a unit for comparing a speed detected by the speed detection unit with a speed set by the speed setting unit to produce an output as the input signal to the rotary motor.

REFERENCES:
patent: 4322712 (1982-03-01), Yoshida
patent: 4748607 (1988-05-01), Nakane
patent: 4931889 (1990-06-01), Osafune
patent: 5016216 (1991-05-01), Horie et al.
patent: 5087997 (1992-02-01), Osada et al.
"Videorecorder-Technik, Grundlagen, Schaltungstechnik und Service", Friedrich Manz, 1987, pp. 92-93 and 102-103.
Patent Abstracts of Japan, vol. 9, No. 26, (p-332)[1749], Feb. 5, 1985 based on JP-A-59-171080.
Patent Abstracts of Japan, vol. 11, No. 137, (P-572)[2584], May 2, 1987, based on JP-A-61-276133.

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