Title: Gray tone generation

Abstract: An ink jet printer in which refined half-tones or shades of gray are produced while retaining high contrast capability using a dot matrix in which the dots are of the same density for the same shading plus or minus one drop of ink at selected dot locations within the matrix but with each dot being printed in response to an individual shading density or darkness input signal.

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Inventors: Berry, James M. (Deerfield, IL, US)
Hauser, Anthony J. (Bellwood, IL, US)
Knuth, Kurt E. (Mount Prospect, IL, US)
Ollendick, Gary B. (Chicago, IL, US)

Application Number: 583306
Filing Date: 1975-06-02
Publication_date: 1976-08-24
Assignee: Teletype Corporation (Skokie, IL)
Primary Class(es): 347/15 283/93, 283/117, 347/74, 358/3.01
Other Classes:
US Patent Ref:

3373437	Mar, 1968	Sweet et al.	346/75.
3604846	Sep, 1971	Behane et al.	178/6.
3681650	Aug, 1972	Koll	178/6.
3928718	Dec, 1975	Sagae et al.	178/6.

Other Refs:
Primary Examiner: Hartary, Joseph W.
Assistant Examiner:
Attorney: Dosse; W. G., Landis; J. L.