Title:
METHOD FOR MEASURING FLATNESS OF SHEET MATERIAL AND STEEL SHEET PRODUCTION METHOD UTILIZING SAID METHOD
Document Type and Number:
WIPO Patent Application WO/2011/145168
Kind Code:
A1
Abstract:
[Problem to be solved] To provide a method whereby it is possible to measure the flatness of a sheet material without requiring a large-scale measuring device. [Solution] The method involves projecting a contrast pattern (P), comprising light areas and dark areas, onto the surface of a sheet (S) traveling in the lengthwise direction, and using an imaging means (2) with an imaging field larger than the width of the sheet material to acquire the contrast pattern, and analyzing the acquired pattern image in order to measure the flatness of the sheet material. The method is characterized in that the contrast pattern, in which the light areas are positioned at a prescribed spacing both longitudinally and transversely, is formed by the light from a LED light source (1) equipped with multiple LEDs (111) positioned at a prescribed spacing both longitudinally and transversely, and is projected on the surface of the sheet material such that the longitudinal direction of said contrast pattern is aligned with the long side of the sheet material and the transverse direction of said contrast pattern is aligned with the short side of the sheet material.
Inventors:
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
加藤 朋也 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
加藤 朋也 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
Application Number:
JP2010/058329
Publication Date:
November 24, 2011
Filing Date:
May 18, 2010
Export Citation:
Assignee:
Sumitomo Metal Industries, Ltd. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
ISEI Yoshito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
伊勢居 良仁 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KATO Tomoya (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
G01B11/25; B21B38/02; B21C51/00; G01B11/30
Attorney, Agent or Firm:
OHNAKA Minoru (Daiichijuken Nagahoribashi-ekimae bldg. 4F, 3-6 Minamisemba 2-chome, Chuo-ku, Osaka-sh, Osaka 81, 〒5420081, JP)
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Claims: