LIGHTING DEVICE, IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS
PROBLEM TO BE SOLVED: To provide a lighting device, an image reading apparatus and an image forming apparatus each of which includes a light source in which a plurality of light-emitting elements are lined and provides an excellent image by reliably reducing illuminance irregularities on the light i...
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| creator | MIYOSHI AYANORI YOSHIMOTO MITSUHARU |
| description | PROBLEM TO BE SOLVED: To provide a lighting device, an image reading apparatus and an image forming apparatus each of which includes a light source in which a plurality of light-emitting elements are lined and provides an excellent image by reliably reducing illuminance irregularities on the light irradiation surface of an original caused by the light-emitting elements while efficiently irradiating the light irradiation surface of the original with light from the light-emitting elements. SOLUTION: In the lighting device 210 having the light source 211 in which the plurality of light-emitting elements (212a), (212b) having strong directional characteristics in a prescribed direction and radiating an optical axis L toward a light irradiation area L' extending in a main-scanning direction X to the original document G are lined, the plurality of light-emitting elements (212a), (212b) are disposed in such a manner that optical axis distances Ha and Hb to the original G are different between the light-emitting elements 212a on one side and the light-emitting elements 212b on the other side opposing them and the optical axis distances Ha and Hb repeatedly become long and short alternately on both sides. COPYRIGHT: (C)2010,JPO&INPIT |
| format | Patent |
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SOLUTION: In the lighting device 210 having the light source 211 in which the plurality of light-emitting elements (212a), (212b) having strong directional characteristics in a prescribed direction and radiating an optical axis L toward a light irradiation area L' extending in a main-scanning direction X to the original document G are lined, the plurality of light-emitting elements (212a), (212b) are disposed in such a manner that optical axis distances Ha and Hb to the original G are different between the light-emitting elements 212a on one side and the light-emitting elements 212b on the other side opposing them and the optical axis distances Ha and Hb repeatedly become long and short alternately on both sides. 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SOLUTION: In the lighting device 210 having the light source 211 in which the plurality of light-emitting elements (212a), (212b) having strong directional characteristics in a prescribed direction and radiating an optical axis L toward a light irradiation area L' extending in a main-scanning direction X to the original document G are lined, the plurality of light-emitting elements (212a), (212b) are disposed in such a manner that optical axis distances Ha and Hb to the original G are different between the light-emitting elements 212a on one side and the light-emitting elements 212b on the other side opposing them and the optical axis distances Ha and Hb repeatedly become long and short alternately on both sides. 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SOLUTION: In the lighting device 210 having the light source 211 in which the plurality of light-emitting elements (212a), (212b) having strong directional characteristics in a prescribed direction and radiating an optical axis L toward a light irradiation area L' extending in a main-scanning direction X to the original document G are lined, the plurality of light-emitting elements (212a), (212b) are disposed in such a manner that optical axis distances Ha and Hb to the original G are different between the light-emitting elements 212a on one side and the light-emitting elements 212b on the other side opposing them and the optical axis distances Ha and Hb repeatedly become long and short alternately on both sides. COPYRIGHT: (C)2010,JPO&INPIT</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION |
| title | LIGHTING DEVICE, IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS |
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