Global Patent Index - EP 1090770 A1

EP 1090770 A1 2001-04-11 - A device for direct electrostatic printing with a conventional printhead structure and an AC-voltage coupled to both the toner bearing surface and the control electrodes

Title (en)

A device for direct electrostatic printing with a conventional printhead structure and an AC-voltage coupled to both the toner bearing surface and the control electrodes

Title (de)

Vorrichtung zum direkten elektrostatischen Drucken mit einer konventionellen Druckkopfstruktur und einer Wechselspannung, die sowohl an die tonertragende Oberfläche als an die Steuerelektroden gekoppelt ist

Title (fr)

Dispositif d'impression électrostatique directe avec une structure d'une tête d'impression conventionelle et un circuit AC aussi bien couplé à la surface portante du toner qu'aux électrodes de commande

Publication

EP 1090770 A1 (EN)

Application

EP 99203305 A

Priority

EP 99203305 A

Abstract (en)

A DEP device wherein printing is realised by applying a first AC-voltage upon a surface bearing charged toner particles with an amplitude that is not sufficient for toner particles to pass through the printing apertures, and enhancing said AC-field present between the toner bearing surface and the printhead structure, by applying a second AC-voltage (which is out of phase with respect to the first AC-voltage) upon the control electrodes, so that in an image wise manner the AC-field between the toner bearing member and the control electrodes can be switched from an ON condition in which toner particles can pass the printing apertures, to an OFF condition in which said toner particles are prevented from passing said printing apertures. <IMAGE>

IPC 1-7 (main, further and additional classification)

B41J 2/415

IPC 8 full level (invention and additional information)

B41J 2/415 (2006.01)

CPC (invention and additional information)

B41J 2/4155 (2013.01)

Citation (applicant)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1090770 A1 20010411

INPADOC legal status


2003-11-05 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030503

2002-02-20 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: AGFA-GEVAERT

2002-01-02 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR GB

2001-12-05 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20011011

2001-04-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB

2001-04-11 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI