IMAGE SENSOR UNIT, AND IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS USING THE SAME
First Claim
1. 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, andwherein 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.
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Accused Products
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.
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Citations
5 Claims
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1. An illumination device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification