Patent ID: 6163414
Filing Date: 2000-12-19
Classification: G02B

Abstract:
An image reading apparatus comprising:illuminating means for illuminating an original with light;a lens forming an image of reflected light from the original, said lens having a resolution characteristic in which a resolution in a vertical scanning direction in an image-reading wavelength region at a field angle in a vicinity of an end of the original is lower than a minimum resolution in an image-reading wavelength region at a field angle on an inner side of the vicinity of the end of the original;light shielding means for shielding part of the reflected light such that a pupil diameter in the vertical scanning direction in the reflected light from the vicinity of the end of the original is reduced; andphotoelectrically converting means for converting the reflected light partly shielded by said light shielding means and undergone image formation by said lens into an electrical signal.