Electrographic methods using hard magnetic carrier particles

G - Physics – 03 – G

Patent

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G03G 19/00 (2006.01) G03G 9/097 (2006.01) G03G 9/107 (2006.01) G03G 13/05 (2006.01) G03G 15/09 (2006.01)

Patent

CA 2375298

Disclosed are methods and apparatus for electrographic development which utilize a rotating magnetic core, a toner shell disposed around the rotating magnetic core, and developer compositions disposed on the toner shell which include a hard magnetic material, such as a strontium ferrite. The shell in embodiments has an outer surface with a surface roughness Ra of less than 32 microinches. The methods and apparatus do not require special manufacturing steps to place surface roughness or irregularities on the shell, and, thus, can provide the same or better image quality with relatively less complex manufacturing steps and at reduced cost.

L'invention concerne des procédés et un dispositif utiles dans le développement électrographique, qui emploient un noyau magnétique tournant, une enveloppe de toner placée autour du noyau magnétique tournant, et des compositions de révélateur placées sur l'enveloppe de toner et qui contiennent une matière magnétique dure telle que la ferrite de strontium. L'enveloppe, dans certaines formes de réalisation, comporte une surface extérieure présentant une rugosité de surface Ra inférieure à 32 micropouces. Les procédés et le dispositif ne nécessitent pas d'étapes spéciales de fabrication pour former les rugosités ou irrégularités sur la surface de l'enveloppe, et permettent ainsi d'obtenir une qualité d'image égale ou supérieure avec des étapes de fabrication relativement moins complexes et à moindre coût.

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