| 摘要 |
PURPOSE:To obtain a device which satisfies the read precision even if the light source is a white light source such as a halogen lamp, by providing a wavelength band filter between a light source part and a photosensor. CONSTITUTION:The luminous flux from white light sources 27A and 27B is irradiated to originals 331-333 through an original table 26. Reflected luminous fluxes from originals 331-333 are converged and focused on photosensors 311- 313 by zone plates 281-283 having the focusing function. A wavelength band filter 30 is provided between zone plates 281-283 and photosensors 311-313, and luminous fluxes incident to photosensors 311-313 are converted to luminous fluxes having desired wavelength characteristics by this filter 30 and substantially are made monochromatic. |
