INFRARED RAY DETECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a lens in an optical system not to move even under a high impact and high rotation. SOLUTION: With the side surface of a lens 12 tapered in thickness direction, the lens 12 is brought into tight contact with an adapter 13 where a hole of the same tapered shape as the lens 12 is formed so that the adapter 13 holds the lens 12. The taper angle of the lens 12 and the adapter 13 is pre-set by considering the degree or assumed impact. The infrared ray condensed with the lens 12 is detected by a photo-diode 8.