| 摘要 |
PURPOSE:To improve lighting efficiency by equalizing the shape of the light projection end surface of a light guide member to that of the reflecting surface of transmission surface of a prism or lens. CONSTITUTION:The projection end surface 12 of the light guide member is formed in the same shape with the reflecting surface 14a of the lighting prism 14. Luminous flux which is emitted by the light projection surface 12 and transmitted through a relay lens 13 is all reflected by the reflecting surface 14a of the lighting prism 14 because it forms a section in the same shape to the same area nearly with the reflecting surface, so almost no loss is generated. The light projection end surface and incidence end surface of the light guide member are therefore reduced in area and the light is converged by a condenser lens, etc., and made incident on an optical fiber, so the quantity of projection light per unit area on the light projection end surface 12 increases. Consequently, the quantity of illumination light of a surgical operation part increases and the number of necessary optical fibers is reducible, so a microscope for surgical operation is reduced in cost. |
