| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus capable of measuring the angle of a roof mirror etc. high accuracy. SOLUTION: A laser beam is irradiated to a surface to be measured. A reflected laser beam reflected at the surface to be measured is condensed to a light-receiving part and received. The measurement value of the angle of inclination of the surface to be measured is determined, on the basis of an amount of change in the position of light reception in the angle-measuring apparatus. The angle-measuring apparatus is provided with both a beam splitter 2, arranged in front of a laser beam emergent opening of a laser angle measuring device 1, for splitting the laser beam emergent from the laser beam emergent opening, transmitting one leaser beam toward one of a pair of roof surfaces, which are provided for the surface to be measured and form a roof angle, and reflecting the other in a direction vertical to the direction of the transmission and a mirror 3 for reflecting the laser beam reflected in a direction vertical to the direction of the transmission, in parallel with the direction of the transmission and irradiating it to the other roof surface. A polarizing filter 4a and a half-wave plate 5a for removing only one returning light to the light-receiving part are arranged on the optical path of the laser beam. COPYRIGHT: (C)2006,JPO&NCIPI
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