Illumination warm-up control in a document scanner

Details Illumination warm-up control in a document scanner Illumination warm-up control in a document scanner

1993-04-26

1994-08-09

Mis, David

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Radiant energy responsive control type

315158, 315219, 315224, 315226, 315307, 315360, 355 69, 355229, H05B 4139, G03B 2772

Patent

active

053369769

ABSTRACT:
A method for determining when overall lamp intensity is stable for a lamp in a document scanner. The intensity of a relatively small portion of the lamp is controlled as part of a closed loop intensity control system. During a warm-up transient period, the intensity of the small portion of the lamp is monitored and power to the lamp is monitored. A changing power to the lamp indicates that the overall lamp intensity has not stabilized. Scanning is initiated when the intensity of the monitored portion of the lamp is within a predetermined control range and the power to the lamp has stabilized for a predetermined time period. The predetermined time period can be a default value or can be determined by a user.

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