Compact illumination system with light absorbing and reflecting

Details Compact illumination system with light absorbing and reflecting Compact illumination system with light absorbing and reflecting

1976-08-11

1977-01-25

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250566, 250239, H01J 314, H01J 516, H01J 3912

Patent

active

040052869

ABSTRACT:
A method and system for uniformly illuminating a field of information is provided for optical readers having a scanning device loosely constrained in movement. Lamps are symmetrically located about the optical axis of a sensor and enclosed within a four-sided illuminator. The sides of the illuminator converge at one end to a port having dimensions defined by the field to be viewed. A plate between the lamps and the sensor partially closes the second end of the illuminator, with an aperture therein symmetrical to the optical axis of the sensor. Internal wall portions of the illuminator adjacent to the reflecting plate are of a high diffuse reflectance, while portions adjacent to the port are of a low diffuse reflectance.

REFERENCES:
patent: 2957085 (1960-10-01), Faulhaber
patent: 3359425 (1967-12-01), Smith
patent: 3561846 (1971-02-01), Kingsland
patent: 3581100 (1971-05-01), Milford
patent: 3673416 (1972-06-01), Berler
patent: 3784794 (1974-01-01), Allais

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