| 摘要 |
PROBLEM TO BE SOLVED: To provide the projection display device which uses laser light of high power density enabling projection on a large screen and is equipped with a means for improving the safety. SOLUTION: This device projects and displays an image while scanning a screen by polygon mirrors 17 and 18 by sending a signal from a control part 40 according to image data inputted to an image input part 47 and making laser light emitting units of three colors provided for a laser scanner part 10 emit lights. If the entry of foreign body into an optical path or abnormality of the scanning is detected by a human body sensor part 30, a pyroelectric sensor 31 that a laser scanner part 10 is equipped with, a horizontal scanning beam sensor 19, or a vertical scanning beam sensor 20, the scanner control part 12 electrically stops the laser light emitting units from emitting the lights and an optical path cutting-off device 61 mechanically stops the scanning light from being projected to completely prevent unexpected danger to a human body.
|
