| 摘要 |
PURPOSE:To always eliminate the parallax even if a distance of an object to be photographed is varied by providing a prism in front of a projection optical system, and varying a prism fitting angle in accordance with a focus ring. CONSTITUTION:In front of a light emitting element 34 and a projection lens 35, a prism 36 is placed, connected to a focus ring 30 by a lever 39, and the focus ring 30 rotates and slides forward and backward, by which the prism 36 turns centering around a fulcrum 31. Therefore, an angle (angle theta) made by a straight line vertical to base length and a focus lens optical axis, and a projection light beam can be varied. Accordingly, since the projection light beam 37 is set so as to be always on the focus lens optical axis 32, the parallax on this plane always is eliminated. |
