Image reading apparatus, image forming apparatus, storage medium, and image reading method

摘要

An image reading apparatus irradiates an object with light and reads an image on or of the object. The image reading apparatus includes a table on which the object is placed, a planar light source configured to emit light to the object, a range-finding section configured to measure a distance between the table and the object, and a control section configured to cause the planar light source to entirely or partially emit light. The control section controls a light emitting portion of the planar light source thereby to control a light collection spot for the planar light source to a position based on a measurement value obtained by the range-finding section.

主权项

1. An image reading apparatus that irradiates an object with light and reads an image on or of the object, comprising:
a table having a flat surface on which the object is placed; a light source including an inner surface having a curved shape and being configured to emit the light from at least a light emitting portion to the object on the flat surface of the table, the light emitting portion being a portion of the inner surface, the curved shape allowing a location of the light emitting portion to be changed within the inner surface along the curved shape so that a light collection spot of the light shifts along a direction perpendicular to the flat surface of the table; an imaging device configured to detect light reflected off the object; a range-finding section configured to measure a distance between the flat surface of the table and the object; and a control section configured to change the location of the light emitting portion within the inner surface along the curved shape according to the distance measured by the range-finding section, wherein the image reading apparatus reads the image on or of the object through the imaging device detecting light reflected off the object.