Halftone image printing device

Details Halftone image printing device Halftone image printing device

1987-04-23

1989-12-26

Shaw, Clifford C.

Recorders

Thermal recording

358296, 358298, 400120, G01D 1510, H04N 123, B41J 320

Patent

active

048901210

ABSTRACT:
A halftone image printing device represents an image using a pixel matrix, prints each pixel as a dot pattern constituted by predetermined dots in a dot matrix, and controls the dot pattern and the printing density (multilevel density) of each dot included in the dot pattern in accordance with the density (multilevel) of the pixel. An overall printing density range is divided into four density ranges, i.e., from the lowest to the highest density ranges, and each pixel is defined by a 3.times.3 dot matrix. A dot pattern in the lowest density range has a dot at the center of the matrix, a dot pattern in the next lowest range has dots at the center of the matrix and at positions above and to the right of the center, a dot pattern in the next highest density range has dots at the center of the matrix and at positions above, below, and to the right and left of the center, and a dot pattern in the highest density range has dots at the center of the matrix and at positions above, below, to the right, left, and upper right of the center. In order to print each dot at each density level in each density range, the level of energy supplied to the heating element of the thermal head corresponding to each dot is precisely controlled.

REFERENCES:
patent: 3710913 (1973-01-01), Brennan, Jr. et al.
patent: 3922484 (1975-11-01), Keller
patent: 4333112 (1982-01-01), Matsumoto
patent: 4368491 (1983-01-01), Saito
patent: 4394693 (1983-07-01), Shirley
patent: 4412225 (1983-10-01), Yoshida et al.
patent: 4531160 (1985-07-01), Ehn
patent: 4532523 (1985-07-01), Tanaka
patent: 4536771 (1985-08-01), Tanaka
patent: 4563691 (1986-01-01), Noguchi et al.
patent: 4578713 (1986-03-01), Tsao et al.
patent: 4595956 (1986-06-01), Kawamura et al.

Affiliated with

Also associated with

Rating

Halftone image printing device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Halftone image printing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Halftone image printing device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1579329