CORRECTING MECHANISM FOR LIGHT DISTRIBUTION AND LIGHT QUANTITY OF IMAGE PROJECTING MECHANISM

摘要

PURPOSE:To perform stable and secure light distribution correction and light quantity correction over a wide range by providing a swing member, and bringing one end part of the swing member into contact with a frame body at different positions from respective shafts and the other end part into contact with a cam fixed to a main body. CONSTITUTION:A light distribution adjusting member 46 is rotatable around shafts 46' and 46'A and a light quantity adjusting member 48 is rotatable around a shaft 48'. The light distribution adjusting member 46 is moved by a lens moving base 40 to a prescribed position together with a projection lens 7 according to magnification M. At this time, the frame 45A where the light distribution adjusting member 46 has its shaft 46'A received by bearings 41 and 42A and a lever 113 which swings around a support shaft 112 fixed at a different position of the bearing 42A is provided as the swing member; and a pin 114 as a guide member is fixed at an end part of the lever and the pin 114 is fitted in the long-sized guide groove 45B of the frame 45A. Further, a pin 52 as a guide member is fixed at the other end part of the lever. Consequently, the displacement quantity L1 of the cam is smaller than the movement distance of the lens moving base 40 and the slope of the cam is reduced to smooth the operation.