Pyroelectric direct marking method and apparatus
US5153615A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Apr 26, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/344
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for printing including the use of a pyroelectric material in a novel fashion to directly mark an image on a print substrate. The image is produced by initially coating a poled pyroelectric material with a uniform coating of charged marking particles and subsequently thermally exposing the pyroelectric material in a localized fashion, thus reversing the polarity of the charge which repels the particles from the surface of the pyroelectric material, and in the direction of the surface of a print substrate placed in close proximity thereto. Subsequently, the image formed by the transferred marking particles is fixed to the substrate by a thermal or other well known fusing treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.