System for charging a photoreceptor
AssigneeEastman Kodak Company
InventorMark C. Zaretsky
Life of this patent
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Abstract
A system for charging a photoreceptor (3) includes a first corona charging unit (2) a first corona electrode (4), a first shell electrode (6), and a first high voltage power supply (22). The shell electrode is connected through a resistor to ground and the high voltage power supply is connected to the first corona electrode. A second corona charging unit (10) has a second corona electrode (12), and a first grid electrode (14) connected to a second shell electrode (16). A first corona current from the first high voltage power supply to the first corona electrode and a return current from the first shell electrode to ground is sensed and a voltage on the high voltage power supply is adjusted to maintain a constant difference. The first corona charging unit charges the photoreceptor to at least 63% of the desired voltage.
Claims17
A system for charging a photoreceptor to a desired voltage level comprising:
- a first corona charging unit having a first corona electrode, a first shell electrode, and a first high voltage power supply;
- wherein the first shell electrode is connected through a resistor to a first ammeter;
- wherein the first high voltage power supply is connected to the first corona electrode;
- a second corona charging unit having a second corona electrode, a first grid electrode, and a second shell electrode;
- wherein the grid electrode is connected to the second shell electrode;
- a second ammeter for sensing a first corona current from the first high voltage power supply to the first corona electrode;
- wherein the first ammeter senses a return current from the first shell electrode to ground;
- a controller for adjusting a voltage on the first high voltage power supply to maintain a constant difference between the first corona current and the return current;
- wherein the first corona charging unit charges the photoreceptor to at least 63% of the desired voltage;
- and
- wherein the second corona charging unit charges the photoreceptor to within plus or minus 10% of the desired voltage.
A system for charging a photoreceptor to a desired voltage level comprising:
- a first corona charging unit having a first corona electrode, a first shell electrode, and a first high voltage power supply;
- wherein the first high voltage power supply is connected to the first corona electrode;
- a DC high voltage power supply for raising the potential of the first shell electrode to at least one tenth the magnitude of the potential of the first corona electrode;
- a second corona charging unit having a second corona electrode, a grid electrode, and a second shell electrode;
- wherein the grid electrode is connected to the second shell electrode;
- a first ammeter for sensing a first corona current from the first high voltage power supply to the first corona electrode;
- a second ammeter for sensing a return current from the first shell electrode to ground;
- a controller for adjusting a voltage on the first high voltage power supply to maintain a constant difference between the first corona current and the return current;
- wherein the first corona charging unit charges the photoreceptor to at least 63% of the desired voltage;
- and
- wherein the second corona charging unit charges the photoreceptor to within plus or minus 10% of the desired voltage.
A system for charging a photoreceptor to a desired voltage level comprising:
- a first corona charging unit having a first corona electrode, a first shell electrode, a first grid electrode, and a first high voltage power supply;
- wherein the first shell electrode is connected through a resistor to a first ammeter;
- wherein the first grid electrode is connected to the first shell electrode;
- wherein the first high voltage power supply is connected to the first corona electrode;
- a second corona charging unit having a second corona electrode, a second grid electrode, and a second shell electrode;
- wherein the second grid electrode is connected to the second shell electrode;
- a second ammeter for sensing a first corona current from the first high voltage power supply to the first corona electrode;
- wherein the first ammeter senses a return current from the first shell electrode to ground;
- a controller for adjusting a voltage on the first high voltage power supply to maintain a constant difference between the first corona current and the return current;
- wherein the first corona charging unit charges the photoreceptor to at least 63% of the desired voltage;
- and
- wherein the second corona charging unit charges the photoreceptor to within plus or minus 10% of the desired voltage.
Dependencies are inferred from the claim text.