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:
May. 19, 1998
Filed:
Nov. 28, 1994
Isamu Tomita, Kawasaki, JP;
Tsuyoshi Furukawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic disk drive unit includes a first read amplifier connected to an inductive head, a second read amplifier connected to a magneto-resistive head, a selective output unit for selecting either an output of the first read amplifier or an output of the second read amplifier and supplying a selected output to a demodulator, and a control unit for supplying a switching control signal. When reading servo information written onto a data surface of a magnetic recording medium, the control unit controls the switching control signal and thus causes the selective output unit to select an output of the first read amplifier associated with the inductive head. By the constitution, servo information can be detected in a wide range using a relatively simple data-surface servo pattern. This realizes high-precision off-tracking compensation.