| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a linear light source capable of accomplishing a document reading apparatus in which an illuminance difference in a depth direction of document placing glass is reduced and even when the height of a document to be read is changed, the contrast of a copied image is not changed considerably with respect to the document. <P>SOLUTION: In a linear light source in which an LED is arranged at an end portion of an approximately cylindrical light guiding member, the light guiding member is configured such that an upper portion, which has an approximately circular portion and which includes a light-emitting face, a flat lower portion, which includes a light reflection face formed so as to face the upper portion, and side portions which connect the upper portion and the lower portion to each other, are arranged to extend in a longitudinal direction, respectively, and a light diffusion and reflection member is provided outside the light guiding member over at least one of the lower portion and the side portions through an air layer. <P>COPYRIGHT: (C)2011,JPO&INPIT |
