Double-Beam Electrophotographic Laser Printer/Scanner
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
An electrophotographic printer/scanner system is shown and described in which dual beams are formed which are angularly separated so that, by summing the two printer/scanner signals, a better signal/noise ratio or dynamic range of a laser printer/ scanner is achieved. The system includes a photoconductor drum 10 upon which is formed a toned image by conventional techniques. A scanning beam 11 is projected along a path including a half-silvered mirror 12 which forms two separate beams 13 and 14. Beams 13 and 14 are each directed by mirrors 15, 16 and 17 over a path to photoconductor drum 10 to scan the image thereon. The scattered radiation from each of the beams is directed by a Fresnel lens 18 to a sensing photodiode 19.