Nippon Steel Sumitomo Metal Corporation

Masayuki Yoshida

Mutsumi Tanida

Masami Sakiyama

A two-dimensional code reading deviceis provided with image pickup devicewhich receives light reflected from either of a first inclined portionand a second inclined portionin a direction forming an angle &#x3b8; satisfying expression (1) with respect to the normal-line direction R, and light sourcewhich irradiates either of the inclined portions from a direction forming an angle &#x3b1; satisfying expression (2) with respect to the normal-line direction R:30&#xb0;&#x2266;&#x3b8;&#x2266;35&#xb0;&#x2003;&#x2003;(1)&#x394;&#x3b8;=&#x3b8;&#x2212;180&#xb0;+&#x3b1;+2&#x3b2;&#x2003;&#x2003;(2)where &#x3b2; is less than 90&#xb0;,

Two-dimensional code reading device, two-dimensional code reading method, method of controlling manufacturing history information of member having substantially circular section orthogonal to the central axis thereof, and method of manufacturing the member using the control method

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Amagasaki, Japan

Masayuki Yoshida