Image sensor unit, and image reading apparatus and image forming apparatus using the same
AssigneeCanon Components, Inc.
InventorShuuichi SHIMODA
Life of this patent
Estimating the term…
Abstract
An image sensor unit includes: a light guide reflecting light rays entering through a first light entering surface and a second light entering surface provided at both ends thereof, by a reflection surface to make the light rays exit through a light exiting surface and illuminates an original; a first light source provided near the first light entering surface; a second light source provided near the second light entering surface and different in wavelength from the first light source; and a first reflection part and a second reflection part provided on the reflection surface and composed of dot patterns constituted of two kinds of dots different in spectral reflectance.
Claims5
An illumination device, comprising:
- a light guide having a first light entering surface at one end in a longitudinal direction thereof and a second light entering surface at the other end, the light guide reflecting light rays from a first light source arranged near the first light entering surface and from a second light source arranged near the second light entering surface on a reflection surface to illuminate an illuminated object,
- wherein said first light source is composed of one or a plurality of light emitting elements,
- wherein said second light source is a light source different in emission wavelength from said first light source and composed of one or a plurality of light emitting elements,
- wherein the reflection surface provided at a surface opposing the light exiting surface is provided with a first reflection part and a second reflection part,
- wherein the first reflection part has a high spectral reflectance with respect to an emission wavelength from the light emitting element provided in said first light source, and has a reflectance on a side of the second light entering surface higher than a reflectance on a side of the first light entering surface, and
- wherein the second reflection part has a high spectral reflectance with respect to an emission wavelength from the light emitting element provided in said second light source, and has a reflectance on the side of the first light entering surface higher than a reflectance on the side of the second light entering surface.
Dependencies are inferred from the claim text.