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. 31, 2015
Filed:
Jun. 29, 2010
Tatsuya Ueno, Tokyo, JP;
Tatsuya Ueno, Tokyo, JP;
Azbil Corporation, Tokyo, JP;
Abstract
A tension/speed measuring device comprises a laser driver for driving the oscillation of a semiconductor laser, and a counter for counting interference waveforms included in the output of a photodiode for converting the output of the semiconductor laser into an electrical signal. The counter measures the periods of interference waveforms during a measuring interval, where a frequency distribution for the periods of the interference waveforms during the measuring interval is generated from the measuring results, where a class value wherein the product of the class value and the frequency is a maximum is used as a representative value Dat the periods of the interference waveform, to calculate a total Ns of the frequencies of the classes that are less than 0.5 times the representative value Tand to calculate a total Nwof the frequencies of the classes that are equal to or greater than (n+0.5) times the representative value Tand less than (n+1.5) times the representative value T, to correct the counting results based on these frequencies Ns and Nwn.