| 摘要 |
PURPOSE:To enable the accurate confirmation of the position of an illuminated article even in an dimming condition by projecting an infrared ray to the article and detecting an infrared ray reflected therefrom. CONSTITUTION:A spot projection optical system 20 has a shutter 23 for controlling projected light in the optical path thereof and an infrared reflection filter 25 for reflecting an infrared ray from a light source 10 toward the outside of the optical path. Also, a whole system is constituted with the addition of an infrared projection optical system 30 for projecting the reflected infrared to the same projection direction as the light of the spot projection optical system 20 for lighting an illuminated article on a stage, and a monitor mechanism 40 for monitoring a reflected infrared ray from the illuminated article. As a result, the infrared ray projected to the article on the stage is reflected therefrom and an operator can detect the infrared ray reflected from the article with the monitor mechanism 40. According to the aforesaid construction, it is possible to obtain a stage projection device enabling the confirmation of the position of the illuminated article even in a dimming condition. |
