| 摘要 |
PURPOSE:To improve the read precision by inserting a light-transmissive plate, which corrects the difference of the distance between an image and an object for insertion of one of filters inserted in time division to the optical path through which the reflected light from the surface of an original is incident on an image sensor, together with the other. CONSTITUTION:The optical path where the reflected light from the surface of an original 1 is incident on an image sensor 5 through a lens 4 is formed. Filters 9a, 9b, and 9c are inserted to the optical path in time division, and color signals of two colors are read divisionally. The distance between the original 1 and the sensor 5 is set to a value for insertion of the filter 9a having a maximum optical path length. When the filter 9b is inserted, a light- transmissive plate 11 which corrects the difference of the distance between the original 1 and the sensor 5 is put on the filter 9b and they are inserted to the optical path. When the filter 9c is inserted, a light-transmissive plate 12 which corrects the difference is put on the filter 9c and they are inserted to the optical path. Thus, the read precision is improved.
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