| 摘要 |
<p>A color reading apparatus is disclosed. In the apparatus, a reflection type one dimensional blazed diffraction grating for color separation is provided on an optical path between an imaging optical system for focusing an color image on a photosensor and the photosensor in which three line sensor are disposed on a same substrate. The pitch of the diffraction grating is varied in a direction of the pitch so as to control the reflective diffraction angle from reflection points resulting from different incident angles on the diffraction grating and to prevent the occurrence of a blur of +/-1st-order diffracted lights in the pitch cross section on the diffraction grating. <IMAGE></p> |
