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:
Jan. 26, 1988
Filed:
Apr. 28, 1986
Applicant:
Inventors:
Hiroshi Suzuki, Tokyo, JP;
Shouji Nakajima, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 46 ; 360 65 ;
Abstract
In a read circuit for an FDD, a differentiator is constituted by a pair of current control transistors connected differentially, and a series circuit of a capacitor, an inductor, and first and second resistors connected between the transistors. A switch is connected across one of the resistors. When a track counter detects an inner track, it supplies an active signal to the switch. The switch is closed to short-circuit the resistor, thereby decreasing the damping value of the differentiator.