| 摘要 |
PROBLEM TO BE SOLVED: To provide an infrared crime-prevention sensor capable of easily and smoothly adjusting an optical axis when light-receiving sensitivity is adjusted by a projection power control.SOLUTION: Projectors 1A and 1B include: projection power control means 5 for switching projection power thereof among a plurality of stages on the basis of a level of a detecting signal to control light-receiving sensitivity of optical receivers 2A and 2B; and state discrimination means 7 for discriminating a state when adjusting the optical axis from a state when performing warning. The projection power control means 5 includes, in the optical axis adjustment, a manual adjusting section 10 for manually adjusting the projection power and an automatic adjusting section 11 for automatically adjusting it. The projectors 1A and 1B have adjustment selection sections 6 capable of selecting manual or automatic adjusting sections 10 and 11 such that the manual adjusting section 10 can manually adjust the projection power in the optical axis adjustment. |
