Multi-level xerography exposure control through multi-beam...

G - Physics – 03 – G

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G03G 13/04 (2006.01) B41J 2/435 (2006.01) G06K 15/12 (2006.01)

Patent

CA 2134517

A raster output scanning system is disclosed which utilizes two light beams to double scan two scan lines on a photoreceptor in order to generate three exposure levels required for a tri-level printing system. In the raster output scanner of this invention, the two light beams scan two separate scan lines. At the completion of the simultaneous scanning of two light beams when the first light beam starts to scan a new scan line, the second light beam start to scan the scan line that the first light beam just completed scanning. In this invention the first light beam generates two exposure levels and the second light beam adds additional exposure to the second exposure level in order to generate a third exposure level. The same method can be utilized to generate additional levels for printing systems with more xerographic levels than three.

L'invention est un système de balayage générateur de trames qui utilise deux faisceaux lumineux pour balayer en double deux lignes d'un photorécepteur pour produire les trois niveaux d'exposition nécessaires à un système d'impression à trois niveaux. Dans le système de balayage de l'invention, les deux faisceaux lumineux balaient deux lignes distinctes. € la fin du balayage simultané effectué par les deux faisceaux lumineux, quand le premier faisceau commence à balayer une nouvelle ligne, le second faisceau commence à balayer la ligne que le premier faisceau vient de balayer. Dans cette invention, le premier faisceau lumineux produit deux niveaux d'exposition, alors que le second faisceau ajoute une exposition additionnelle au second niveau d'exposition afin de produire le troisième niveau d'exposition. La même méthode peut être utilisée pour produire des niveaux additionnels dans les systèmes d'impression utilisant plus de trois niveaux xérographiques.

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