| 摘要 |
PURPOSE:To diffuse effectively light which is propagated in a photoconductor cable and to light up a wide range by forming numbers of grooves annularly in the surface of a columnar photoconductor and radiating the light which is propagated in the photoconductor out of the photoconductor through groove parts. CONSTITUTION:The light propagated in the photoconductor 1 in parallel to the photoconductor is reflected partially out of the photoconductor 1 by groove parts 21-2n as shown by arrows and the remaining unreflected light further travels in the photoconductor 1. Similarly, light reflected by each groove part is emitted out of the photoconductor 1, but the light propagated in the photoconductor 1 is actually converged light, so the light is diffused and the emitted effectively at the respective groove parts 21-2n in respective directions. Then, the density of the luminous flux in the photoconductor 1 decreases as the light travels and the quantity of the light decreases gradually while the light is emitted out of the photoconductor 1, so the groove density is increased in the propagation direction of the light and the depth of the grooves is increases so as to emit the light uniformly from the entire surface of the photoconductor 1. |
