The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1988
Filed:
Nov. 29, 1985
Daniel Carteau, Limours, FR;
Jean-Jacques Couette, Montigny le Bretoneux, FR;
Christian Maury, Velizy, FR;
Pham D Tam, Bagneux, FR;
Cii Honeywell Bull, Paris, FR;
Abstract
A magnetic disk memory is moved between a first position beyond the disk periphery to a second position proximate the disk periphery while the head is at an idle height above the disk face. The head is moved between the disk periphery and a third position at the edge of an area on the disk where data are located while the head is lowered and raised between the idle height and a hovering height above a face of the disk. An assembly carrying the head includes a radially extending arm, turned by a rotary DC motor. A continuous step excitation waveform is supplied to the motor as the head is driven between the first and second positions until the head arrives at one of the two positions. Each of the steps has a constant amplitude that differs from the immediately preceding step by a predetermined incremental value. All of the steps, except the last step, has the same predetermined duration. The last step has a time duration no greater than that of the previous steps and determined by when the head arrives at the one position. To drive the head between the second and third positions a damping impulse having a predetermined constant amplitude and duration is applied to the motor to cause the motor to stop. The motor is stopped without overshoot and driven to a predetermined speed by then applying a decreasing ramp excitation waveform to it.