Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1981-12-18
1984-07-17
Tarcza, Thomas H.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346108, 358298, G01D 1500
Patent
active
044609094
ABSTRACT:
This invention relates to enhancing the apparent resolution of electrophotographic printers. This is accomplished by writing a gray of half-tone halo along the periphery of images written on the photoconductor. When the image with its half-tone halo is developed, transferred and fixed by steps in the electrophotographic process, the printed image has a substantially smooth contour. In effect, the gray halo placed around the image merges with the black interior of the image when the image is developed, transferred and fixed. To prevent the image from appearing to be too thick after its contour has been smoothed by the use of the half-tone halo, the number of black picture elements used to write the image on the photoconductor are reduced. Also, the width of image segments making up the image may be adjusted by changing the level of gray used to write the half-tone halo.
REFERENCES:
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patent: 3573789 (1971-04-01), Sharp et al.
patent: 4052715 (1977-10-01), Streifer
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patent: 4079367 (1978-03-01), Yonezawa et al.
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patent: 4365275 (1982-12-01), Berman et al.
IBM Technical Disclosure Bulletin, vol. 23, No. 11, Apr. 1981, entitled "High Resolution Display and Printing Technique," by Y. L. Yao, pp. 5225-5226.
IBM Technical Disclosure Bulletin, vol. 20, No. 1, Jun. 1977, entitled "Gray Scale to Pseudo Halftone Conversion," by A. L. Mix, Jr. et al., pp. 31-32.
Xerox Disclosure Journal, vol. 6, No. 1, Jan./Feb. 1981, entitled "Character Edge Smoothing for Matrix Printing," by D. L. Ort. p. 19.
IBM Technical Disclosure Bulletin, vol. 21, No. 2, Jul. 1978, pp. 729-730, entitled "Low Resolution Print Quality Enhancement," by J. E. Garcia.
Bassetti Larry W.
Hooker, III Ross B.
Kantor Sherwood
International Business Machines - Corporation
Knearl H. L.
Rohrer C. E.
Tarcza Thomas H.
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