Image reading device and image forming apparatus for detecting dirt at a document reading position

摘要

An image reading device includes: a document conveyance section configured to convey an original document placed on a document loading chute; an original glass plate allowing the document conveyed from the document conveyance section to pass thereover; a reading unit that includes a light-emitting part including first, second, and third light sources and configured to emit light toward the document at a predetermined document reading position and a light-receiving part configured to receive light reflected on the document; a housing including a hollow letting part of light from the light-emitting part out of the image reading device; a foreign matter detecting section configured to detect a foreign matter on the original glass plate; and an operation control section configured to control the operation of the light-emitting part and, upon detection of the foreign matter, allow the light-emitting part to emit light in a different color from when reading the document.

主权项

1. An image reading device comprising:
a housing forming an outer covering of the image reading device; a document conveyance section including a document loading chute and configured to convey an original document placed on the document loading chute; an original glass plate allowing the original document being conveyed from the document conveyance section to pass thereover; a reading unit including a light-emitting part and a light-receiving part, the light-emitting part including first light source, second light source, and third light source and configured to emit light toward the original document at a predetermined document reading position, the light-receiving part being configured to receive light reflected on the original document; an operation control section configured to control a light emitting operation of the light-emitting part; and a foreign matter detecting section configured to detect a foreign matter on the original glass plate, wherein the housing is provided with a hollow capable of letting part of the light emitted from the light-emitting part out of the image reading device, and the operation control section is further configured to, when the foreign matter detecting section detects the foreign matter on the original glass plate, allow the light-emitting part to emit light of a different color from the light emitted during reading of the original document.