OPTICAL AXIS ADJUSTMENT MECHANISM

摘要

PROBLEM TO BE SOLVED: To reduce the optical axis matching man-hour and enable automation of adjustment operation, by enabling two-dimensional displacement of a holding substrate of holding a light-projecting element into a direction perpendicular to an optical axis. SOLUTION: A holding substrate 5 is elastically pressed inside of a cut-out part 20 and temporarily fixed for enabling two-dimensional displacement by bush nuts 8 mounted on two shafts 23. A current is supplied to an LED 6 on the temporarily fixed holding substrate 5, and a light emitting part 60 is caused to emit light, thus performing optical axis adjustment for checking the light receiving state of a photodiode 13. In this case, when the holding substrate 5 which is plastically and lightly pressed inside of the cut-out part 20 is slide, this sliding causes unified two-dimensional displacement of the LED 6 inside a plane perpendicular to an optical axis L-L. Since the light emitting part 60 of the LED 6 is mounted in the direction perpendicular to the holding substrate 5, a projection optical path from the light emitting part 60 of the LED 6 may be caused to coincide with the optical axis L-L easily and accurately.