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. 17, 1995
Filed:
Oct. 23, 1992
Masafumi Nagami, Saitama, JP;
Kansei Corporation, Saitama, JP;
Abstract
A cross-coil type measuring instrument which is employed as an engine tachometer for instance. A cross-coil type measuring instrument includes a cross-coil type measuring unit having a pair of coils arranged crossed forming a predetermined angle with each other, and a movable magnet magnetized bi-polar which is set rotatable by the magnetic action of said pair of coils, a driving circuit for producing polarized drive signals which are different from each other in phase and change in response to variation in values to be measured, and a constant voltage source for supplying a first constant voltage to the driving unit, the first constant voltage being switched to a second constant voltage periodically in response to a switching signal. Due to the switching of the constant voltage, the amount of power supplied to the cross coils can be made smaller resulting in reducing the amount of heat generated therein as much.