Dual light source voltage-modulated reciprocal control...

Details Dual light source voltage-modulated reciprocal control... Dual light source voltage-modulated reciprocal control...

2006-07-04

2006-07-04

Lee, Michael G. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S455000

Reexamination Certificate

active

07070102

ABSTRACT:
A dual light source voltage-modulated reciprocal control circuit for a scanner. The circuit includes a voltage modulation circuit, a first lamp driving circuit, a second lamp driving circuit and a reciprocal control circuit. The voltage-modulating circuit generates a modulated voltage whose magnitude can be adjusted through pulse width modulation of a square wave. The first lamp driving circuit receives the modulated voltage to drive a first lamp. Similarly, the second lamp driving circuit receives the modulated voltage to drive a second lamp. The reciprocal control circuit redirects the modulated voltage to the first lamp driving circuit or the second lamp driving circuit according to the dictate of a reciprocal logic signal.

REFERENCES:
patent: 4504951 (1985-03-01), McMahan et al.
patent: 5144117 (1992-09-01), Hasegawa et al.

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