Contact image sensor, output correction device for contact image sensor, and output correction method for contact image sensor

摘要

A light source unit emits light for irradiating a document. A light guide in which light emitted from the light source unit propagates has a first exit part for emitting light to the document and a second exit part, which is a different part from the first light part, for emitting light to the outside. A corrective light receiver is disposed in an area receiving direct light of the light emitted from the second exit part, and outputs reference data corresponding to the direct light. A controller compares predetermined criterion data with the reference data output from the corrective light receiver, and performs processing for correcting a bright output based on a result of the comparison.