Apparatus for printing grey scale images

Photocopying – Contact printing – Light boxes

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

355326, 430 43, 430 45, G03G 1508

Patent

active

051841835

ABSTRACT:
An electrophotographic printing process enables a two-color printer having only binary printing capability to produce high-quality monochrome grey-scale output having, for example, up to 100 grey levels in a 3.times.3 super-pixel through the use of a second toner comprising a mixture of opaque black, opaque white, and clear toner. A layer of the second toner is applied so as to overlie the first toner layer on the substrate, the first toner comprising black toner. The composition of the second toner may be, for example, 9 percent opaque black toner, 9 percent opaque white toner, and 82 percent clear toner. Another embodiment extends this concept to the high-quality, enhanced grey-scale printing of a color other than black. In another embodiment, the layer of the second toner is comprised of a mixture of equal amounts of opaque black toner and opaque white toner and is applied so as to overlie the first toner layer on the substrate, the first toner layer comprised of black toner having a charge-to-mass ratio in the range of 2 to 10 times less than the second toner. This embodiment is also extended to high-quality, enhanced grey-scale printing of a color other than black. The use of these concepts is also extended to a full-color printer, in which each color is printed using enhanced grey-scale.

REFERENCES:
patent: 4302201 (1981-11-01), Hasegawa et al.
patent: 4935782 (1990-06-01), Kohyama
patent: 5077158 (1991-12-01), Nakano

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Apparatus for printing grey scale images does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for printing grey scale images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for printing grey scale images will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-9965

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.