21-11-2013 дата публикации
Номер: US20130308982A1
Принадлежит:
Printers, methods, and apparatus to form an image on a substrate are disclosed. An example disclosed charge roller includes a dielectric outer layer () comprising an inner surface () and an outer surface (), the outer surface () to be charged by a first external surface and to discharge onto a second external surface, and the dielectric outer layer () to substantially prevent charge transfer between the inner surface () and the outer surface (), and an electrically conductive inner layer () to direct electrical charge toward and away from the inner surface () of the outer layer (), and to be coupled to an electrical source to control a transfer of the electrical charge. 1. A charge roller , comprising:{'b': 104', '106', '108', '108', '104', '106', '108, 'a dielectric outer layer () comprising an inner surface () and an outer surface (), the outer surface () to be charged by a first external surface and to discharge onto a second external surface, and the dielectric outer layer () to substantially prevent charge transfer between the inner surface () and the outer surface (); and'}{'b': 102', '106', '104, 'an electrically conductive inner layer () to direct electrical charge toward and away from the inner surface () of the outer layer (), and to be coupled to an electrical source to control a transfer of the electrical charge.'}2102. A charge roller as defined in claim 1 , wherein the inner layer () comprises at least one of an electrically conductive rubber or a metal.3104. A charge roller as defined in claim 1 , wherein the outer layer () comprises para-xylylene or a derivative of para-xylylene.41041061081. A charge roller as defined in claim 1 , wherein the outer layer () is to conduct between the inner () and outer () surfaces less than about percent of current transferred from the first external surface to the second external surface.5102. A charge roller as defined in claim 1 , wherein the inner layer () is to be biased with at least one of an alternating ...
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