Image reading apparatus

Details Image reading apparatus Image reading apparatus

1998-10-13

2000-12-19

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359778, 399 8, 399 72, G02B 936

Patent

active

06163414&

ABSTRACT:
An image reading apparatus includes: illuminating means for illuminating an original with light; a lens forming an image of reflected light from the original, the 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; and photoelectrically converting means for converting the reflected light partly shielded by the light shielding means and undergone image formation by the lens into an electrical signal.

REFERENCES:
patent: 4450358 (1984-05-01), Reynolds
patent: 4863251 (1989-09-01), Herloski et al.
patent: 5617252 (1997-04-01), Manhart et al.
patent: 5646788 (1997-07-01), Bietry

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