Apparatus for detecting the presence and size of a document

Details Apparatus for detecting the presence and size of a document Apparatus for detecting the presence and size of a document

1988-11-18

1990-05-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, G01N 2186

Patent

active

049298445

ABSTRACT:
The invention relates to a reading apparatus provided with a document table. More particularly, it relates to a reading apparatus which automatically detects the presence or absence of a document and/or the size of a document mounted on the document table. The reading apparatus related to the invention is provided with a light source which illuminates the document table and a means for collecting information about light intensity of the document table. The reading apparatus first gains information about light intensity of the document table when the light source is off and that when it is on, and then by comparing these informations, it detects the presence or absence of a document and/or the size of the document. Accordingly, the reading apparatus correctly detects the presence or absence of a document and/or the size of the document without being affected by external light even when the document cover remains open. Furthermore, the reading apparatus correctly detects the presence or absence of a document and/or the size of the document without taking the open and closed condition of the document cover into account.

REFERENCES:
patent: 4458264 (1984-07-01), Tamura
patent: 4734762 (1988-03-01), Aoki et al.

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