DOCUMENT ILLUMINATION DEVICE AND IMAGE READING APPARATUS

PROBLEM TO BE SOLVED: To provide a document illumination device and image reading apparatus for achieving high illuminance illumination without enlargement. SOLUTION: A first document illumination unit 4 and a second document illumination unit 7 are arranged so that LED (Light Emitting Diode) illumi...

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Bibliographic Details
Main Authors MIYAGAKI KAZUYA, NISHINA KIICHIRO, SAKURAI YASUO, ITO MASAHIRO, TAKAURA ATSUSHI, ONO NOBUAKI
Format Patent
LanguageEnglish
Published 09.09.2010
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
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Summary:PROBLEM TO BE SOLVED: To provide a document illumination device and image reading apparatus for achieving high illuminance illumination without enlargement. SOLUTION: A first document illumination unit 4 and a second document illumination unit 7 are arranged so that LED (Light Emitting Diode) illumination light sources 2 and 5 and light guide members 3 and 6 are mirror-symmetrically in a sub-scanning direction with respect to the center line A-A' of the sub-scanning direction of a document reading region. In the first document illumination unit 4 and the second document illumination unit 7, a multi-chip LED 1 of each of LED illumination light sources 2 and 5 is arranged so that the illumination light L points downward. Then, inside the first light guide member 3 and the second light guide member 6, the illumination lights of both document illumination units 4 and 7 are reflected so as to overlap on a document reading surface 9. COPYRIGHT: (C)2010,JPO&INPIT
Bibliography:Application Number: JP20090043686