PROJECTION-TYPE DISPLAY DEVICE

PROBLEM TO BE SOLVED: To prevent image quality from being deteriorated for a long period, by solving the problem, wherein an image of dust or the like stuck to the outgoing surface of a rod integrator is formed on a light bulb and the quality of a projected image is deteriorated in a projection-type display device using the rod integrator and having optically conjugate relation between the outgoing surface and the surface of the light bulb and cleaning the outgoing surface of the rod integrator at the time of exchanging a lamp. SOLUTION: Since a cleaning mechanism is constituted of an actuator 10 energized to arrow A direction on the inserting position of a lamp unit 3, a linking mechanism 11 for transmitting the movement of the actuator 10 and a cleaning arm 13, which is driven by the link mechanism 11 and to a part of which a cleaning pad 12 made of microfibers is attached, the outgoing surface 6 of the rod integrator 4 can be cleaned at the time of substituting the lamp and proper image quality can be held. COPYRIGHT: (C)2006,JPO&NCIPI