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1. US6011944 - Printhead structure for improved dot size control in direct electrostatic image recording devices

Office
United States of America
Application Number 08757972
Application Date 05.12.1996
Publication Number 6011944
Publication Date 04.01.2000
Grant Number 6011944
Grant Date 04.01.2000
Publication Kind A
IPC
G03G 15/08
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
15Apparatus for electrographic processes using a charge pattern
06for developing
08using a solid developer, e.g. powder developer
B41J 2/385
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
385characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
B41J 2/41
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
385characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
41for electrostatic printing
B41J 2/415
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
385characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
41for electrostatic printing
415by passing charged particles through a hole or a slit
CPC
B41J 2/4155
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, ; e.g. INK-JET PRINTERS, THERMAL PRINTERS; , i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
385characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
41for electrostatic printing
415by passing charged particles through a hole or a slit
4155for direct electrostatic printing [DEP]
G03G 2217/0025
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
2217Details of electrographic processes using patterns other than charge patterns
0008Process where toner image is produced by controlling which part of the toner should move to the image- carrying member
0025where the toner starts moving from behind the electrode array, e.g. a mask of holes
Applicants Array Printers AB
Inventors Nilsson Daniel
Agents Knobbe, Martens, Olson & Bear, LLP
Title
(EN) Printhead structure for improved dot size control in direct electrostatic image recording devices
Abstract
(EN)

A printhead structure for a direct electrostatic printing device selectively conveys a stream of charged toner particles from a particle source directly onto an image receiving substrate. The printhead structure includes an electrode plate having openings which surround the apertures. A voltage applied to the electrode plate causes a converging electric field to applied to the toner particles passing through the apertures. The converging electric field causes the toner particles to converge toward respective central axes of the apertures to thereby focus the stream of toner particles. The focusing of the toner particles considerably reduces the dot sizes on the printed image. The use of the printhead structure results in increased print resolution and improved image quality.


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