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    • 1. 发明专利
    • POSITION MEASURING INSTRUMENT OF UNDERGROUND EXCAVATOR
    • JP2000292168A
    • 2000-10-20
    • JP10428299
    • 1999-04-12
    • HITACHI CONSTRUCTION MACHINERY
    • MINOMOTO YASUSHISHIMOMURA YOSHIAKIKAMEI TAKESHI
    • E21D9/06G01C15/00
    • PROBLEM TO BE SOLVED: To provide the position measuring instrument of the underground excavator which never lowers the reliability of measurement even if the light of a light source other than an object to be detected is made incident on a measurement unit in the measurement. SOLUTION: A measurement base point, an intermediate measurement point, and a point to be measured are set in order, and a measurement unit 400 having a common lens 411 which converges diffused lights from front and rear light sources 41 and 42, position detecting elements 412-1 and 412-2 which detect the photodetection positions of the converged lights, a controller 43 which processes their detection results, reflecting prisms 413-1 and 413-2 which transmit the lights to be made incident on the lens and guide the lights converted by the lens to the respective detecting elements, and the light sources 41 and 42 whose lights are directed to the front and rear by the reflecting prisms is provided at each measurement point; and the position of the point to be measured relative to the measurement base point is measured on the basis of the detection results of the measurement units and the distances between the measurement units, the pixel outputting a maximum detection output is selected out of the respective pixels of the position detecting elements, and the photodetection positions of the lights are calculated by the controller 43 according to the detection values of the selected pixel and its peripheral pixels.