Image reading apparatus

Details Image reading apparatus Image reading apparatus

1996-01-11

1997-11-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358475, 358474, 358494, 359894, 359798, 359740, H04N 104, G02B 900, G02B 2702, G02B 500

Patent

active

056870086

ABSTRACT:
A drum scanning type image reading apparatus includes an illumination optical system and an imaging optical system. The illumination optical system is an optical system for irradiating light upon an original. A variable aperture stop is disposed at a conjugate position with the original. In the imaging optical system, a pick-up lens focuses an image of an image reading region of the original on an image focusing surface, and photomultiplier tubes read light passing through one of holes which are formed in a main aperture plate which is disposed on the image focusing surface. To change an image reading resolution in the image reading apparatus, the image reading region and an illumination region are changed by changing the aperture size of the main aperture plate and the size of the variable aperture stop.

REFERENCES:
patent: 3994589 (1976-11-01), Nodwell et al.
patent: 4729036 (1988-03-01), Ikeda et al.
patent: 4945220 (1990-07-01), Mallory et al.
patent: 5144478 (1992-09-01), Toshimitsu
patent: 5392094 (1995-02-01), Kudo
patent: 5530518 (1996-06-01), Ushida et al.

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