Patent ID: 6316767
Filing Date: 2001-11-13
Classification: H04N

Abstract:
An image scanner for scanning an image, comprising:a light sensor;a cover having a closed position and an open position, wherein the cover in closed position is located so as to block substantially all light otherwise incident on the light sensor and wherein the cover in open position is located so as to enable the light sensor to detect incident ambient light, wherein source of the incident ambient light is external to the scanner;an electrical-power-control circuit, comprising a rate of change detection circuit, a timing circuit, and an on/off circuit, wherein the rate of change detection circuit is configured to receive incident light signal from the light sensor and to activate the timing circuit when the rate of change of incident ambient light exceeds a preselected rate; andan exposure lamp, wherein the timing circuit is configured to activate the on/off circuit when the timing circuit is activated and wherein the on/off circuit is configured to provide connection for conduction of electrical power from an electrical-power source to the exposure lamp when the on/off circuit is activated.