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1. (WO1987003412) DETECTION AND AMPLIFICATION CIRCUIT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1987/003412 International Application No.: PCT/US1986/001986
Publication Date: 04.06.1987 International Filing Date: 25.09.1986
IPC:
G11B 5/596 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
58
with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596
for track following on discs
Applicants:
XEBEC DEVELOPMENT PARTNERS, LTD. [US/US]; 580 California Street Suite 2100 San Francisco, CA 94104, US
Inventors:
BLESSUM, Norman, S.; US
Agent:
CHARTOVE, Alex; Spensley Horn Jubas & Lubitz 1880 Century Park East Suite 500 Los Angeles, CA 90067, US
Priority Data:
800,06320.11.1985US
Title (EN) DETECTION AND AMPLIFICATION CIRCUIT
(FR) CIRCUIT DE DETECTION ET D'AMPLIFICATION
Abstract:
(EN) A disc drive control system including servo sectors (S1, S2...) written on a disk, (13) with each sector containing three sets of marker pulses (P1, P2, P3) arranged to that three adjacent marker pulses from each of the sets spans two tracks (G1). The pulses each comprise high frequency sinusoidal signals. Servo control depends upon the pulse amplitudes sensed by the read/write head while traversing a servo sector.
(FR) Système de commande d'une unité de disque comprenant des secteurs d'asservissement (S1, S2 ...) écrits sur un disque (13), chaque secteur contenant trois ensembles d'impulsions de marquage (P1, P2, P3) disposés de sorte que trois impulsions de marquage adjacentes de chacun des ensembles s'étendent sur deux pistes (G1). Chaque impulsion comprend des signaux sinusoïdaux à haute fréquence. La commande d'asservissement se base sur les amplitudes des impulsions captées par la tête de lecture/écriture lorsqu'elle traverse un secteur d'asservissement.
Designated States: DE, GB, JP, KR
European Patent Office (AT, BE, CH, DE, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0245303DE000003690612GB2191609KR1019887000995