Document size detection apparatus

Details Document size detection apparatus Document size detection apparatus

1991-11-05

1993-03-30

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355202, 355203, 355311, 358449, 358488, G03G 2100

Patent

active

051988534

ABSTRACT:
A document size detector for detecting a size of a document in use with a document scanner. The document size detector has an irradiator to irradiate the document with a light beam; a cover of the document; a receiver of the reflection light from the document and the cover; a converter to convert the reflection light to image signals; a detector to detect the shadow of the document on the cover in the image signals; and the determiner to determine the size of the document according to the detected shadow of the document.

REFERENCES:
patent: 4630127 (1986-12-01), Fuwa
patent: 4672461 (1987-06-01), Yoshida
patent: 4922350 (1990-05-01), Rombola et al.

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