Clocked optical sensing apparatus

Details Clocked optical sensing apparatus Clocked optical sensing apparatus

1986-12-30

1989-05-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, 377 53, G01N 2186

Patent

active

048354031

ABSTRACT:
A document sensor comprises a source of infrared light directed toward a document and a photocell for reacting to the light as it is reflected from the document. A clock drives the light source to send cyclically recurring light pulses toward the document. The clock source also enables a detector each time that the document light source is switched on. After a predetermined number of successive reflected light pulses have been picked up, a document present signal is given.

REFERENCES:
patent: 4068222 (1978-01-01), Treviranus
patent: 4458146 (1984-07-01), Reiner et al.
patent: 4591708 (1986-05-01), Shu
patent: 4636633 (1987-06-01), Roger et al.
patent: 4652742 (1987-03-01), Wauer et al.

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