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:
Apr. 14, 2015
Filed:
Oct. 18, 2012
Yoshito Isei, Osaka, JP;
Tomoya Kato, Osaka, JP;
Masahiro Osugi, Osaka, JP;
Hideyuki Takahashi, Osaka, JP;
Yoshito Isei, Osaka, JP;
Tomoya Kato, Osaka, JP;
Masahiro Osugi, Osaka, JP;
Hideyuki Takahashi, Osaka, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
Measuring sheet material flatness includes projecting a bright and dark pattern made up of bright parts and dark parts onto a sheet material surface travelling in a lengthwise direction, picking up an image of pattern with image pickup device to acquire a pattern image, with the pickup device having a field of view larger than a sheet material width. The acquired pattern image is analyzed, wherein a pattern in which a bright part is disposed at a predetermined set pitch respectively in longitudinal and lateral directions is formed by an LED light at a predetermined pitch respectively in the longitudinal and lateral directions. The pattern is projected onto the surface such that the longitudinal direction of the pattern lies along a lengthwise direction of the sheet material, and the lateral direction of the pattern lies along a width direction of the sheet material.