PURPOSE: To minimize the number of the element necessary to the photodetector and to facilitate to manufacture the attitude detecting device in the excavator with a low cost by providing the lens to convert to the transmitting light to diffuse the laser beam in the fan-shaped way on the irradiating line of the laser beam and being equipped with the photodetecting element arranged along the line to cross to the surface including the transmitting light from the lens.
CONSTITUTION: On the irradiating line of one side reflecting laser beam L1, the first diffusing lens 19 to convert the beam L1 to the transmitting light to diffuse only in the fan-shaped Y shaft equivalent direction is provided. To the surface including the transmitting light, a photodetecting element 15 is arranged along the crossing X shaft equivalent line, and the first photodetecting device 12 to detect the photodetecting position in the X shaft direction is formed. On the irradiating line of other side reflecting laser beam L2, the second diffusing lens 20 to convert the beam L2 to the transmitting light to diffuse only in the fan-shaped X shaft equivalent direction is provided. To the surface including the transmitting light, the element 15 is arranged along the line in the crossing Y shaft equivalent direction and the second photodetector 13 to detect the photodetecting position in the Y shaft direction is formed.
TSUCHIMOTO MASAAKI
IMOMOTO MASAHIRO
SUGIOKA SHOJI
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