Abstract: 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.

Abstract: The light source unit comprises a light source emitting visible light and light of a non-visible wavelength; a rod-like light guide at the end of which the light source is provided and within which incident light from the light source is propagated in the long axis direction; a reflector that is linear along the long axis direction and provided on the contour surface of the light guide; and a support member encompassing the reflector and light guide, having a given width in the direction perpendicular to the long axis direction, and provided with an opening extending along the long axis direction. The reflector and support member are formed by a reflecting material containing a substance reflecting the light of a non-visible light wavelength and reflecting the visible light and light of a non-visible light wavelength.

Abstract: 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.

Abstract: The light source unit comprises a light source emitting visible light and light of a non-visible wavelength; a rod-like light guide at the end of which the light source is provided and within which incident light from the light source is propagated in the long axis direction; a reflector that is linear along the long axis direction and provided on the contour surface of the light guide; and a support member encompassing the reflector and light guide, having a given width in the direction perpendicular to the long axis direction, and provided with an opening extending along the long axis direction. The reflector and support member are formed by a reflecting material containing a substance reflecting the light of a non-visible light wavelength and reflecting the visible light and light of a non-visible light wavelength.