Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-10-29
1981-09-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250568, H01J 314
Patent
active
042886902
ABSTRACT:
A system for uniformly illuminating a field of information is provided for optical character readers having a scanning device loosely constrained in movement. Lamps are symmetrically located about the optical axis of a sensor and enclosed within an illuminator. The sides of the illuminator converge at one end to port having dimensions defined by the field to be viewed. A plate between the lamps and the sensor partially encloses the second end of the illuminator with an aperture therein symmetrical to the optical axis of the sensor. The sides of two opposite walls of the illuminator adjacent to the port are cut out to remove a portion thereof to eliminate internal reflections and to give the operator a better view of the information to be scanned.
REFERENCES:
patent: 3976973 (1976-08-01), Martin et al.
patent: 4115703 (1978-09-01), Pobras
patent: 4210802 (1980-07-01), Sakai
Nelms David C.
Recognition Equipment Incorporated
Vandigriff John E.
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