Two-dimensional code reading apparatus, two-dimensional code reading method, the production history information management method for orthogonal cross-section is substantially circular member to the central axis, and a method of manufacturing the member using the control method

摘要

PROBLEM TO BE SOLVED: To provide a two-dimensional code reader and a method for reading the two-dimensional code processed and formed on a member having an approximately circular cross section orthogonal to the central axis, and also to provide a manufacturing history information management method using the reader, and a manufacturing method for the member using the management method.;SOLUTION: A recessed part 11, processed and formed on the member and forming a two-dimensional code 10, has a tilted parts 12, 13 tilted so that an angle is made to normal direction R of the surface of the member. A two-dimensional code reader 20 is equipped with an imaging means 22 for receiving light reflected at the tilted part toward the direction in which the angle , satisfying a formula (1) 3035is made to the normal direction R, and a lighting means 21 to irradiate the tilted part from the direction in which the angle , satisfying the formula (2) =-180++2, is made to the normal direction R. In this case, the is less than 90, is in the range of -10 to 10, and the direction of and is opposite the direction where the angle is made by the tilted part to the normal direction R.;COPYRIGHT: (C)2010,JPO&INPIT