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:
Mar. 29, 1994
Filed:
Jul. 21, 1992
Norio Fujii, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A flexible disk drive device includes an adjusting circuit which sets termination timing of outputting of an index signal in response to the rotating speed of a motor by adjusting charge or discharge time constant of a capacitor; a reference voltage generating circuit which includes a plurality of resistors connected in series between the power source line and the ground line and generates the reference voltage at one of the nodes of the resistor chain; and a reference voltage switching circuit which switches the reference voltage to another reference voltage upon receipt of a speed selection signal which represents a different rotating speed from a predetermined rotating speed, wherein the other reference voltage is so set that the pulse width of the index signal corresponds to a predetermined rotating angle of the motor.