Electrostatic imaging device
AssigneeDennison Manufacturing Company
InventorRichard A. Fotland
Life of this patent
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Abstract
An electrostatic imaging device including an elongate conductor coated with a dielectric, and a transversely oriented conductor contacting or closely spaced from the dielectric-coated conductor. A varying potential between the two conductors results in the formation of a pool of ions of both polarities near the crossover area. Ions are selectively extracted by means of an extraction potential to form a discrete, well-defined charge image on a receptor surface.
Claims35
Electrostatic imaging apparatus, comprising:
- an elongate conductor;
- a dielectric sheath for said elongate conductor;
- a conductive member transversely oriented with respect to said elongate conductor and contacting or closely spaced from said dielectric sheath;
- a varying potential applied between said elongate conductor and said conductive member in order to generate ions in an air region adjacent the dielectric sheath and conductive member;
- and
- means for extracting ions from said air region to create an electrostatic image on a further member.
Electrostatic imaging apparatus, comprising:
- an elongate conductor;
- a dielectric sheath for said elongate conductor;
- a conductive member transversely oriented with respect to said elongate conductor and contacting or closely spaced from said dielectric sheath;
- a varying potential applied between said elongate conductor and said conductive member in order to generate ions in an air region ajacent the dielectric sheath and conductive member;
- an extraction potential between the conductive member and a further conductor;
- an apertured screen electrode;
- a dielectric layer separating the screen electrode from the conductive member;
- and
- a screen voltage between the screen electrode and the further conductor.
An electrostatic imaging method comprising the steps of
- applying a varying potential between an elongate conductor having a dielectric sheath and a conductive member transversely oriented with respect to said elongate conductor and contacting or closely spaced from said dielectric sheath, in order to generate ions in an air region adjacent the dielectric sheath and conductive member,
- extracting ions from said air region, and
- applying the extracted ions to a further member to form an electrostatic image.
Electrostatic imaging apparatus, comprising:
- an insulating substrate including at least one slot;
- an elongate conductor;
- a dielectric sheath for said elongate conductor, wherein said elongate conductor and dielectric sheath are embedded in the slot in said insulating substrate;
- a conductive member mounted on said insulating substrate transversely to and contacting or closely spaced from said dielectric sheath;
- a varying potential applied between the elongate conductor and conductive member to generate a glow discharge adjacent the dielectric sheath;
- and
- means for extracting ions from said glow discharge to create an electrostatic image on a further member.
Electrostatic imaging apparatus, comprising:
- a rotatable drum;
- an elongate conductor;
- a dielectric sheath for said elongate conductor, said elongate conductor and dielectric sheath being circumferentially mounted on said rotatable drum in a helical pattern;
- a plurality of conductive members disposed along an edge line of said rotatable drum, contacting or closely spaced from said dielectric sheath;
- a time varying potential applied between at least one of said conductive members and the elongate conductor to generate a glow discharge adjacent the dielectric sheath;
- and
- means for extracting ions from said glow discharge to create an electrostatic image on a further member.
Dependencies are inferred from the claim text.