| 摘要 |
PURPOSE:To illuminate both faces of an original with less thermal influence and a sufficient quantity of condensing light in a small-sized constitution, by interposing a lamp between an optical fiber and a ring-shaped concave mirror to illuminate the original and illuminating the original from an illumination system in an optical guide tube with the light transmitted through a window hole of the ring-shaped concave mirror. CONSTITUTION:The light of a lamp 44 illuminates a transmission original 2 through an auxiliary condenser lens 48, an aperture 49, a mirror 50 in an optical guide tube 43, and a condenser lens 51 and is transmitted through the original 2. A filament of the lamp 44 is focused onto a light receiving end face of an optical fiber 47 by a ring-shaped concave mirror 45, and the reverse face of the original 2 is illuminated from a light receiving head 41. Therefore, the focal length is made longer and the image of the filament is made larger, but a lamp house 42 is not made longer considering the focal length. Since the concave mirror 45 can be approximated sufficiently to the lamp 44, the quantity of condensed light is larger considering the diameter of the concave mirror to illuminate reflectively the original 2 with a sufficient quantity of light, and the dia meter of a window hole 46 is so set that the quantity of light for transmission illumination is deficient. Further, the production is easy because the constitution is simple, and a fear of troubles is lessened. |
