| 摘要 |
A scanner unit is provided, which can make the amounts of light directed to a read line from the opposite sides of the optic axis plane substantially the same, thereby preventing a shade due to an edge of an attachment portion on a document form occurring.In the scanner unit of the present invention, the carriage mirror 23 and the second carriage 12 of the optical reading device read a document by scanning read lines LL on the document in the scanning direction (R, F) and using light reflected from the document along an optic axis plane PP which contains the read line and extends in perpendicular relation to a document glass table. An exposure lamp 21 and a reflector 22 forming an illumination device illuminate the read line from both sides of the optic axis plane with the light passing along light path L10, L11 and the light passing along light path L20, L21, respectively. An light amount adjusting member, e.g., a filter 25, reduces the amount of light passing along the light path L10, L11 so that the amounts of illumination light directed from both sides of the optic axis plane are made substantially the same at the read line, thereby preventing a shade when reading an edge of an attachment portion on the document.
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