Illumination device and image reading apparatus

摘要

An illumination device and an image reading apparatus having improved heat resistance and spectral characteristics are provided. An illumination device used in an image reading apparatus that moves relative to a read area of a document includes: a light source; a light guide including an incident surface on which light from the light source is incident and an exit surface from which light from the light source exits; and a spectroscopic unit that is provided between the light source and the light guide and includes, on a surface of a glass substrate facing the light source, a multi-layer film for reflecting infrared light toward the light source.

主权项

1. An illumination device comprising:
a light source; a light guide including an incident surface on which light from the light source is incident; and a spectroscopic unit disposed between the light source and the incident surface, wherein the spectroscopic unit includes:
a substrate made of glass; anda multi-layer film that is provided on a surface of the substrate facing the light source and reflects infrared light toward the light source.