Illumination source having programmable rise and fall times

Details Illumination source having programmable rise and fall times Illumination source having programmable rise and fall times

2011-08-02

2011-08-02

Perkey, W. B. (Department: 2862)

Photography

With object illumination for exposure

Variable intensity control

C348S371000, C355S068000, C355S069000, C315S158000, C396S182000, C399S220000

Reexamination Certificate

active

07991281

ABSTRACT:
An illumination source senses a level of ambient light and determines an illumination waveform to be used to illuminate at least a portion of a document. The rise and the fall time of the illumination waveform are independently controlled.

REFERENCES:
patent: 5739847 (1998-04-01), Tranchita et al.
patent: 2006/0033835 (2006-02-01), Pollard et al.
patent: 2009/0153063 (2009-06-01), Sudo
“A Slave Flash Trigger Unit for Underground Photography”, Cambridge Underground, 1977, pp. 66-67.

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