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:
Oct. 10, 2017
Filed:
May. 09, 2014
Korea Institute of Machinery & Materials, Daejeon, KR;
Dongwoo Kang, Daejeon, KR;
Taik Min Lee, Daejeon, KR;
Seung-Hyun Lee, Daejeon, KR;
Young Man Choi, Daejeon, KR;
Deokkyun Yoon, Daejeon, KR;
Kwang-Young Kim, Daejeon, KR;
Jeongdai Jo, Daejeon, KR;
KOREA INSTITUTE OF MACHINERY & MATERIALS, Daejeon, KR;
Abstract
A method of measuring feeding velocity of a web, on which a scale having pitches different from pitches of a mask are formed, is provided. The method includes: calculating a number of vibrations of a moiré image of light passing through the mask and the scale; calculating pitches of the scale of the fed web based on the calculated number of vibrations of the moiré image; averaging the pitches of the scale so that a change in a pitch between adjacent timings among the calculated pitches of the scale is minimized; extracting first signals corresponding to our phases for one pitch based on the averaged pitches of the scale; calculating two second signals for forming a Lissajous circle from the first signals; and calculating an angle of the Lissajous circle by the two second signals and then calculating the feeding velocity of the web by using the calculated angle.