| 摘要 |
PURPOSE:To project images with various kinds of variable power by uniting plural successive converging optical transmitter lens arrays and moving this structure in parallel to an original surface, and providing a means which rotates a lens array put on an optical path by 180 deg.. CONSTITUTION:A converging optical transmitter lens array 1 for life-size projection and a converging transmitter lens array 2 for reduced or enlarged projection are fixed by a lens fixing member 3 across a spacer, etc., when necessary. When the lens array 2 for magnification variation is fixed to the life-size lens array 1 so as to project a reduced image, the array 2 is only rotated by 180 deg. in this state to project an enlarged image. Both lens arrays 1 and 2 are fixed in the united structure so that optical conjugate points are in parallel position relation. The projection end of a driving shaft 10 moves the lens arrays 1 and 2 to right and left to switch lenses and the driving shaft 10 is so positioned between the original surface and a recording medium that its center coincides with the center part of the optical path. |
