PURPOSE: To increase the light quantity of an LED radiated to a document, to enlarge a detecting signal of an element train, and also, to reduce the variance of an output voltage, and to improve the read photographic printing quality of halftone density of the document by performing a light reflection preventive processing to the surface of an inner wall of a through-hole of a supporting body.
CONSTITUTION: Light generated by light emission of a light emitting element, that is an LED 2 enhances a reflection factor of the inner wall surface 4B of a housing, therefore, a part thereof is reflected by the inner wall surface, and also, its reflected light is radiated to the inner wall surface 9 of a through- hole 8 of a supporting body and the light reflection preventive surface 10. In this case, since a light reflection preventive processing is performed to the inner wall surface 9, it does not occur that a secondary reflection is furthermore generated from these surfaces 9, 10.
HIDAKA RYOICHI
TAJIRI HIROMITSU
