BEAM PASSING LINE BLOCKING EQUIPMENT FOR LASER SCANNING UNIT

摘要

PURPOSE: An equipment for blocking the beam passing line of a laser scanning unit is provided, to allow the blocked state to be maintained irrespective of the turning on or off of an equipment, thereby preventing the invasion of impurities or the outflow of a laser beam. CONSTITUTION: The equipment(100) comprises a sliding window member(130) which has a beam passing window corresponding to a beam passing line(5) and can slide between the position blocking the beam passing line and the position opening the beam passing line; a shutter(110) which can slide the blocking position and the opening position horizontally to the sliding direction of the sliding window member between the sliding window member and the beam passing line; a position fixing means(180) which elastically compresses the shutter on the blocking position; and a shutter moving means(150) which is located between the sliding window member and the shutter and moves the shutter from the position where the beam passing window corresponds to the beam passing line to the opening position.