Corona charging element
AssigneeXerox Corporation
InventorsDonald A. Seanor, Judy P. Nagel
Life of this patent
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Abstract
Corona discharge electrodes are coated with compressed dielectric materials. A corona discharge electrode is placed under tension and coated with a molten, viscous dielectric material, such as glass, while under tension. The dielectric material is allowed to cool so that the dielectric material becomes bonded securely to the corona discharge electrode. The tension upon the corona discharge electrode is released thereby causing a compression of the dielectric material adhered thereto. The resulting dielectric coated corona discharge electrode has a substantially improved life and delivers substantially uniform currents.
Claims25
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying tension to the inner conductive electrode;
- depositing a dielectric material adhering the dielectric material to the inner conductive electrode at the interface of the inner conductive electrode and the dielectric material;
- and releasing the tension on the inner conductive electrode thereby causing compression of the dielectric material.
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying stress to the inner conductive electrode;
- coating the inner conductive electrode with a dielectric coating capable of being compressed, said dielectric being in a molten state;
- cooling the dielectric after it has wet the surface of the inner conductive electrode;
- and releasing the stress on the inner conductive electrode, whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating.
A method of making a coated corona discharge member of the type having an inner conductive electrode and an outer dielectric coating comprising:
- (a) applying stress to the inner conductive electrode;
- (b) coating the inner conductive electrode with a dielectric coating capable of being compressed, the dielectric being in a molten state;
- (c) cooling the dielectric after it has wet the surface of the inner conductive electrode to a temperature at which the dielectric becomes securely bonded to the inner conductive electrode;
- and
- (d) releasing the stress on the inner conductive electrode whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating while the outer dielectric coating remains bonded to the inner conductive electrode.
Dependencies are inferred from the claim text.