Abstract An arrangement for compensating for changes in the output of a corotron due to environmental changes. The arrangement includes a control corona device and a controlled corona device, the controlled corona device located in a xerographic reproduction machine in a position to deposit charge on an imaging surface and the control device located remote from said imaging surface and inoperative to deposit charge thereon, but exposed to the same environmental conditions of pressure and temperature, etc. The control corotron is connected in electrical parallel with the controlled corotron, which may be one or all of the corotrons used in the xerographic process, so that changes in the current flow in the control corotron due to the environment effect the voltage applied to the controlled corotron to produce a more stable output therefrom.
In combination, a housing, an electrostatic reproduction system including an imaging surface, located in said housing, a first corona discharge device located adjacent said surface for depositing charge on said imaging surface, said device including a first electrode and a first shield partially surrounding said electrode, a second corona discharge device located remote from said imaging surface and inoperative to deposit charge on said surface, said second device including a second corona discharge electrode and an adjacent conductive charge collecting shield, said first and second corona devices connected in electrical parallel with each other, and a constant current power supply for applying a corona energizing potential to said first and second electrodes.
Claim 2
Dependent Claim
112 words
In combination, a housing, an electrostatic reproduction system including an imaging surface, located in said housing, a first corona discharge device located adjacent said surface for depositing charge on said imaging surface, said device including a first electrode and a first shield partially surrounding said electrode, a second corona discharge device located remote from said imaging surface and inoperative to deposit charge on said surface, said second device including a second corona discharge electrode and an adjacent conductive charge collecting shield, said first and second corona devices connected in electrical parallel with each other, and a constant current power supply for applying a corona energizing potential to said first and second electrodes.
Claim 3
Independent Claim
67 words
The method of stabilizing the flow of charge from a first corona device to an imaging surface of a xerographic reproduction system produced by a high voltage constant current power supply comprising the steps of: connecting a second corona device in electrical parallel with said first device, and locating said second device remote from said surface but subject to the same ambient conditions as said first device.
Claim 4
Independent Claim
67 words
The method of stabilizing the flow of charge from a first corona device to an imaging surface of a xerographic reproduction system produced by a high voltage constant current power supply comprising the steps of: connecting a second corona device in electrical parallel with said first device, and locating said second device remote from said surface but subject to the same ambient conditions as said first device.