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:
Nov. 03, 1992
Filed:
Jul. 25, 1990
Akira Nakamura, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A reading circuit used for a floppy disk unit capable of reading data by converting data stored upon the surface of a floppy disk in the form of magnetic variations of a residual magnetism into voltage variations by using a magnetic head. While one of the voltage signals read by a magnetic head is differentiated by a differentiating circuit with a predetermined differential property, the other voltage signal is supplied to a level slicer and is output after being converted into rectangular pulses at a predetermined threshold value. The pulse signals are delayed in accordance with a phase shift period caused by a differential of a differentiating circuit. The delayed signals are then delivered to a comparator, which detects a signal output from the differentiating circuit by performing a comparison, so as to activate the comparator intermittently. The pulse signals, a peak value of which is detected by the comparator, are shaped by a pulse shaping circuit, and are output.