CONTACT IMAGE SENSOR, AND IMAGE READING APPARATUS

PROBLEM TO BE SOLVED: To provide a contact image sensor providing excellent images because a light guide is not deformed due to heat from an LED by efficiently diffusing the heat, even when heat generation of the LED increases due to an increase in luminance (an increase in power consumption ) of the LED. SOLUTION: The contact image sensor includes: the rod-like light guide 30; an LED substrate 32 which is arranged on at least one end of the light guide 30 and holds a light emitting device for emitting light toward the light guide 30; a radiation block 34 which has heat conductivity higher than that of the LED substrate 32 and the light guide 30 and which is in contact with the LED substrate 32; and a frame 40 which is arranged on the upper surface of a chassis 20 storing the light guide 30, the LED substrate 32 and the radiation block 34, and in which an opening 41 for exposing at least part of the surface of the radiation block 34 and radiating heat is formed. COPYRIGHT: (C)2010,JPO&INPIT