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Smoke detector is commonly used to reduce fire detection time. However, technical problems regarding its inaccuracy of laser beam-receiving point on the surface of the sensor associated with incoming interference are identified when the laser transmitter and receiver are installed at a distance of about 100m. In this paper, we propose the auto focus alignment algorithm with high precision to adjust tilting angle of lasers caused by environmental interference so that solve existing issues using multi-level worm gear set.  : ,  , IR , ,  Key word : Fire Detectors, IR Smoke Detectors, IR Laser, High-Precision Control, Focus Matching Journal of the Korea Institute of Information and Communication Engineering (J. Korea Inst. Inf. Commun. Eng.) Vol. 18, No. 11 : 2759~2764 Nov. 2014

A Study on High-precision Autofocus Matching Device for Smoke Detector Based on IR Laser