Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Electrophoretic imaging – process – composition – or product
Patent
1997-05-28
1999-02-02
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Electrophoretic imaging, process, composition, or product
359296, 345107, G03G 1700, G02B 2600
Patent
active
058662847
ABSTRACT:
A low cost, high speed, high resolution laser printer method and apparatus for re-writable media is presented. Three aspects are presented: 1) a bi-stable, microencapsulated dichroic sphere colorant and surface coating therefore for producing an electric field writable and erasable medium--such as paper or a paper-like display, 2) an electrophotographic printer that is capable of conventional toner-based printing and re-writable "paper" printing and 3) a greatly simplified electrophotographic printer that is dedicated to printing re-writable media. The printer embodiments are based on conventional low cost laser printer designs, and have significant advantages in product cost, printing resolution and speed over the electrode array printer. A laser scanner is used to writably erase the uniform, high voltage charge deposited on the surface of a photoconductor drum or belt. When the re-writable paper is brought in contact with the charge written photoconductor through a biased back electrode roller, fields generated between the photoconductor and back electrode cause color rotation of the dichroic spheres to develop the desired print image.
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Goodrow John
Hewlett--Packard Company
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