Electromagnetic interference suppresion for electrical discharge printers
US4628325A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1984 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Feb 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24917
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a system and method for reducing the level of electromagnetic emission radiated by electrical discharge type printers. Such printers utilize one or more styluses which are scanned across the width of a roll of electrosensitive paper and are selectively energized to vaporize small areas on the paper's coating to thereby form characters. When the coating vaporizes, a spark is produced which generates a broad band of electromagnetic energy which is conducted into the environment due to the conductive coating of the previously printed paper acting as an antenna. In order to reduce the effective antenna length and/or propagation capability to thereby reduce the energy radiated, the present system creates isolation bands at preset intervals as the printing occurs. The isolation bands are produced by continuously energizing all styluses as they scan across the full width of the paper, thereby causing an entire band of the paper's conductive coating to be burned off across the entire width of the paper. Each isolation band severs the conductive surface of the paper, thereby reducing the effective length and/or propagation capability of the antenna created by the printed paper …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.