| 摘要 |
A reduction optical system including a lens 12 and a mirror 13 , a CCD image sensor 11 and a frame including a frame member 4 for accommodating the reduction optical system and the CCD image sensor are integrated to constitute an image reading unit 2 , and the unit 2 is covered with a cover member 1 . A lamp 3 is provided on the cover member 1 and spatially isolated from the inner space of the unit 2 . A slit 16 of the cover member 1 is closed by a transparent member 10. The lamp 3 emits the light 15 a onto a document 17 on a document setting glass 18 , and the reflected light 15 b from the document 17 enters the CCD image sensor 11 through the transparent member 10 , slit 16 , slit 4 ', mirror 13 and the lens 12 and is converted into electrical information, thereby reading image information of the document 17.
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