Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1998-03-09
2000-11-14
Barlow, John
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 206
Patent
active
06145964&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to the art of printing and, more particularly, to an electrode arrangement and contragraphy instrument.
An example of contragraphy process is disclosed in DE-OS 34 11 948. In the contragraphy process, an electrical field is developed through the paper, between the developer surface, which transports a thin layer of electrically charged toner particles, and suitable print electrodes. The respective print electrode develops the required drawing field. If the electrical field force is strong enough at the location of the developer surface in order to overcome the adhesive power of the toner, the toner is torn off at that location and accelerated in the direction of the paper. The shape of the reproduction of the toner on paper is basically determined by the spatial shape and force of the electrical field between print electrode and developer surface. A description is given in DE-OS 34 11 948 of the utilization of one or several, vis-a-vis the developer surface, vertically oriented needles of electrically conducting material (metal). In order to ensure appropriate through-put during the contragraphy process, several print electrodes must operate simultaneously. For example, for printing of DIN A 4 format pages with a resolution of 200 dpi on a page-at-a-time printer, 1654 of such print electrodes are needed.
With this type of matrix of print electrodes, it is, however, difficult to guarantee accurate position of electrodes to each other. Mass production of such an array of electrodes combined with difficulty in automated contacting of individual electrodes is the reason why contragraphy printing in this form has not as yet been able to establish itself on the market.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an electrode arrangement for use in contragraphy printing, which can be produced at favorable costs. Said object is achieved by the combination of characteristics of the present invention.
In the electrode arrangement according to the present invention, methods of industrial thin layer technology are employed which permit trouble-free control of combinations of electrically conducting and electrically isolating micro-structures with a resolution of up to the .mu.-range. Particularly suitable as carriers for the electrode structure are thin polymer foils, which can be structurally coated by the so-called "in-line-process". Normal conductor plates, which are, for example, structurally coated by the flow-solder method, can also be used. Representation of conductor paths with individual diameters of up into the .mu.-range is state of the art. So, preferably circularly-shaped electrodes can, from a production-engineering aspect, beneficially be electrically contacted. Contacting should preferably occur in the same plane. Available processes are, for example: wire-bonding, dye-bonding or the hot-weld process.
Still other advantages and benefits of the invention will become apparent to those skilled in the art upon a reading and understanding of the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The following are exemplary embodiments of the invention, which will be described in detail in this specification and illustrated in the accompanying drawings which form a part hereof, wherein:
FIG. 1 shows a cross-section through an electrode arrangement;
FIG. 2 shows a section along lines II--II in FIG. 1;
FIG. 3 shows a top view of the arrangement in FIG. 1;
FIG. 4 shows a schematic cross-section through the contragraphy instrument of the present invention;
FIG. 5 shows a schematic cross-section through another specific embodiment of the instrument of the present invention;
FIG. 6 shows another application of the electrode arrangement according to the present invention; and,
FIG. 7 shows a contragraphy instrument with an arrangement according to FIG. 6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings wherein the showings are for the purposes of illustrating the preferred embo
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patent: 4568955 (1986-02-01), Hosoya et al.
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patent: 4958172 (1990-09-01), McCallum et al.
patent: 5477250 (1995-12-01), Larson
patent: 5648805 (1997-07-01), Keefe et al.
Barlow John
Gordon Raquel Yvette
Pelikan Produktions AG
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