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. 10, 1992
Filed:
Oct. 26, 1990
Nikon Corporation, Tokyo, JP;
Abstract
An oscillation degree measuring apparatus measures the fixing state of an object to be measured as a numerical value of the degree of oscillation and comprises an ultrasonic exciter for generating ultrasonic waves which shock the object and exciting oscillations, an oscillation detector for detecting the oscillations of the object and converting the oscillations into electrical signals, a band amplifier for extracting a signal element of a predetermined frequency band including a resonant frequency of the object from the detected signals from the oscillation detector, a smoothing circuit for smoothing the signals amplified by the band amplifier, an A/D converter for converting the signals smoothed by the smoothing circuit into digital signals, a control device for operating the A/D converter a plurality of times every time a predetermined time passes, and a data processor for finding an average value of a plurality of digital data obtained by the A/D converter and calculating the degree of oscillation based on the average value.