Document illuminating apparatus using light sources A, B, and C

Details Document illuminating apparatus using light sources A, B, and C Document illuminating apparatus using light sources A, B, and C

1987-06-29

1989-03-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, H01J 4014

Patent

active

048146307

ABSTRACT:
A document imaging apparatus which is used to illuminate a portion of a document at a scanning line in a scanning plane of the apparatus. First and second light arrays are positioned symmetrically with respect to the optical axis of the apparatus, which optical axis is perpendicular to the scanning line. Each of the first and second arrays includes light sources A, B, and C which are arranged in a periodic, repeating sequence ABCA to provide a superposition of light in both spatial and spectral domains at the scanning line. Light emitting diodes, for example, may be used as the light sources.

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