Document size sensing having a spectroscope

Details Document size sensing having a spectroscope Document size sensing having a spectroscope

1992-11-13

1994-06-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356386, G03G 2100, G01N 2126

Patent

active

053212738

ABSTRACT:
A document size sensing device incorporated in an image recorder and capable of sensing a plurality of document sizes with a small number of optical elements. A sensor is made up of a single light emitting element, a spectroscope for dividing light issuing from the light emitting element into a plurality of beams toward a plane where a document is laid, a lens on which light reflected by the document is incident, and a plurality of light-sensitive elements for receiving the light propagating through the lens. A single sensor with such a configuration can sense a plurality of document sizes.

REFERENCES:
patent: 2791931 (1957-05-01), Summerhayes, Jr.
patent: 4505575 (1985-03-01), Kurata et al.
patent: 4572650 (1986-02-01), Okuda
patent: 4698511 (1987-10-01), Sueda et al.

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