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Corona charging apparatus
| Details |
Inventors: Cobb, Harold W.;
Assignee: Delphax Systems (Mississauga, CA)
Primary Examiner: Anderson; Bruce C.
Assistant Examiner:
Attorney, Agent or Firm: Moore; Arthur B.
A corona charging device including a dielectric-coated elongate conductor embedded in a slot in a conductive member. A high voltage varying potential between the elongate conductor and slotted conductive member induces a glow discharge in a region of proximity of the two conductors. The slotted conductor may act as a grounding member to provide a corona discharge device with respect to a proximate surface. Alternately, the slotted conductor may be maintained at a desired potential to provide a charging device with an automatically limited voltage. The slotted conductor and dielectric-coated conductor may be replaced with alternative structures which provide an equivalent enclosure. |
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DETAILED DESCRIPTION In achieving the above and related objects, the invention provides a corona charging device comprising a support structure defining a slot in which a sheathed elongate conductor is placed.
Sides of the support structure adjacent the conductor are conductive and the apparatus may be used for corona charging and discharging using a varying potential between the elongate conductor and the conductive sides of the support structure.
These sides are maintained at ground potential for charge neutralization, and at a limiting bias potential for corona charging.
In accordance with various aspects of the invention, the support structure may have different cross sections.
In the preferred embodiment, the support structure is a conductive beam in which the slot is formed, and the conductor is a cylindrical wire.
In accordance with a related aspect, a variety of insulating materials, preferably inorganic, may be utilized in the dielectric sheath for the elongate conductor.
In an alternative embodiment of the invention, sides of the slot are formed by a pair of conductive bars mounted one on each side of the dielectric-coated conductor.
In accordance with yet other aspects of the invention, the various dimensions may be altered to modify the ion output characteristics of the corona charging and discharging device.
Important parameters include: the lateral separation, if any, of the sheathed conductor from the sides of the support structure; the extent of protrusion or indentation of the sheathed conductor with respect to outer surfaces of these sides; and the width of the support structure as compared with the diameter of the sheathed conductor.
Another important parameter is the separation of the device from the surface to be charged or discharged.
In the preferred embodiment, the dielectric-sheathed conductor contacts the conductive sides of the support structure and protrudes slightly therefrom.
Advantageously, the structure is only slightly broader than the width of the slot.
In still another embodiment of the invention a pair of dielectric-sheathed conductors lie in parallel, one to each side of a central conductive rod, all mounted against an insulating support
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LCD 
