Copier capable of detecting document size

Details Copier capable of detecting document size Copier capable of detecting document size

1991-10-11

1992-06-16

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355 75, 355230, 355311, G03G 2100

Patent

active

051228335

ABSTRACT:
A copier having a platen for laying a document thereon and a platen cover having the inner surface thereof implemented as a mirror surface or similar reflective surface for covering the platen and document, and capable of detecting the size of the document by illuminating the reflective surface of the platen cover and the document, reading the resulting reflections from the platen cover and document, and discriminating the platen cover and document on the basis of data representative of the reflections. Since the density of the reflective surface of the platen cover associated with the area outside of an effective image area changes with the angle of the platen cover, i.e., the thickness of the document, an optimal parameter matching the inclination angle of the platen cover is selected to compensate for the change in density. Even the size of a relatively thick document is surely detected with no regard to the position of the platen cover.

REFERENCES:
patent: 3914049 (1975-10-01), Basu et al.
patent: 4511246 (1985-04-01), Nishiyama
patent: 5016049 (1991-05-01), Onishi et al.

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