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:
Jul. 01, 2008
Filed:
May. 20, 2005
Toshiro Horikawa, Kawasaki, JP;
Toshiro Horikawa, Kawasaki, JP;
Mitutoyo Corporation, Kawasaki, JP;
Abstract
A measuring apparatus employing a differential transformer includes a high-frequency oscillator which generates a high-frequency signal having a frequency higher than the excitation frequency of the differential transformer, a frequency divider which divides the high-frequency signal to generate a driving signal for the differential transformer, a multiplier or divider which reduces the frequency of the high frequency signal by the frequency of the driving signal, a mixer which mixes the output from the multiplier or the divider with the output from the differential transformer, a high-pass filter or a band-pass filter which cuts a low-frequency component of the output from the mixer, and a double balanced mixer which synchronously detects the output from the high-pass filter or the band-pass filter with the use of the high-frequency signal. With the use of the thus configured apparatus, an output signal having a fast response speed can be obtained through the use of an existing head having a low excitation frequency.