Abstract: A light-source-incorporated image sensor in which a light receiving element formed on an insulating substrate is confronted through a light transmission layer with an EL light emitting element formed on a transparent substrate. In the image sensor, the thickness of the transparent substrate is smaller than that of the light transmission layer, whereby the focal depth can be set to a value which is sufficient in practical use.

Abstract: An image reading device in which light receiving elements formed on a first substrate are disposed in opposition to light emitting elements formed on a second substrate with a transparent layer being interposed therebetween. The transparent layer is made of a material whose reflectivity is smaller than that of the second substrate. In another embodiment, gas layers are provided between the transparent layer and the light emitting elements and the gas therein has an index of refraction less than the second substrate. Light transmitting windows provided in an opaque electrode of the light emitting elements have peripheral portions where no light is emitted.