Method and device for reading stamped mark on metallic plate

  • Inventors: WASA YASUHIRO
  • Assignees: Nec Corp
  • Publication Date: August 30, 1988
  • Publication Number: JP-S63208701-A


PURPOSE: To obtain a high-reliability device which is free from mis-detection by deciding the level of the time-division detected difference signal between the signal outputs of two adjacent sensors among plural magnetic sensors which are arranged in array. CONSTITUTION: A magnetic sensor 3 consisting of plural (S 1 WS n ) (n) sets of sensors arrayed in a line is installed on the metallic plate 1 which has the stamped pattern 2. A time-division differential circuit 4 detects difference signal between couples of adjacent sensors of this magnetic sensor 3 in the order of a difference signal between the sensors S 1 and S 2 and the difference signal between the sensors S 2 and S 3 up to a difference signal between the sensors S n-1 and S n . Those difference signals are inputted to an upper-limit comparator 5 which generates an output when a signal is larger than a specific value and a lower-limit comparator 6 which generates an output when the signal is smaller than another specific value, and their outputs are supplied to the set and reset terminals of an RSFF7. COPYRIGHT: (C)1988,JPO&Japio




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