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.

主权项

1. A contact image sensor comprising:
a light source that emits light for irradiating a target to be read; a light guide in which light emitted from the light source and entering an entrance part disposed at one end of the light guide in a main scanning direction propagates, the light guide having a first exit part for emitting the light to the target to be read and a second exit part disposed at the other end of the light guide in the main scanning direction, for emitting light to the outside; a corrective light receiver that 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 reading light receiver that generates image data representing an image of the target to be read by photoelectrically converting the light emitted from the first exit part and reflected by the target to be read; and a corrector that compares predetermined criterion data with the reference data output from the corrective light receiver and, based on a result of the comparison, performs processing for correcting a bright output indicated by the image data generated by the reading light receiver when the target to be read is white.