Sensing of original size

Details Sensing of original size Sensing of original size

2005-10-04

2005-10-04

Coles, Edward (Department: 2622)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S449000, C358S448000, C250S208100

Reexamination Certificate

active

06952290

ABSTRACT:
An original size sensing method for an apparatus which includes a photoelectric converter for reading an image of an original placed on a platen, and a light source for irradiating the original with light, determines the presence/absence of incidence of ambient light on the basis of an output from the photoelectric converter while the light source is kept off. When ambient light is found to be incident, the method determines the size of an original placed on the platen on the basis of that output from the photoelectric converter, which falls outside the range in which the ambient light is incident, while the light source is kept on.

REFERENCES:
patent: 4816867 (1989-03-01), Ito
patent: 4929844 (1990-05-01), Houjiyou et al.
patent: 5041874 (1991-08-01), Nishimori et al.
patent: 5225688 (1993-07-01), Endo
patent: 0525383 (1996-01-01), None
patent: 1-136460 (1989-05-01), None
patent: 5-207239 (1993-08-01), None
patent: 9-329848 (1997-12-01), None

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