| 摘要 |
PURPOSE:To reduce and record a light from an LED light emitting element to a minute light spot by providing a minute semi-spherical lens between the first lens for condensing a light from the light emitting element and the second lens for condensing a light which passes through the first lens to a photosensitive recording body. CONSTITUTION:An output light from an LED tip 10 is directed to the direction of the first lens 13 by an epoxy resin lens 11, and is condensed onto a flat plane of a minute semi-spherical lens 14 by the lens 13. A light emitted from the flat semi-spherical lens 14 comes to have a strong directivity, is reduced again by the second lens 16, and a minute light spot 17 whose diameter is about 100mum is formed on an image face 15. According to such a constitution, the utilizing efficiency of an output light of an LED light emitting element 12 becomes very high, also the optical path length is shortened, for instance, to about 1/5 comparing with that which condenses the output light of the LED light emitting element 12 onto the image face 15 at the same time, and a compact recording light source device is obtained. |
