Patent
1992-06-09
1995-08-08
Powell, Mark R.
395108, 395115, G06F 1562
Patent
active
054406846
ABSTRACT:
A method of manipulating a train of electrical signals equal in binary terms to the density gradation levels of a plurality of image pixels of an original image over a range of density gradation levels for controlling the reproduction of the original image on a receiving sheet in a thermal printer having an array of controllable printing elements corresponding in number to the pixels in an image line and an actuating circuit for actuating the respective printing elements in individually accessible fashion. In the method, the electrical signals for a given line of the image pixels are stored in a line memory and are outputted one by one from the line memory to a non-zero detector and downcounter for identification as to zero or non-zero status and downcounting of all non-zero signals to reduce the level thereof by one level. The detector and downcounter outputs for each signal inputted thereto a control signal to the printer actuating circuit which is a printing signal for each non-zero pixel signal and a non-printing signal for each zero pixel signal to actuate the corresponding printing elements for one printing time period which is selected to result in a reproduction on the receiving sheet of one density gradation level. A feedback re-circulates the zero and value-reduced signals from the downcounter to the input of the line memory for re-delivery to the non-zero detector and downcounter. The cycle is repeated for a total number of cycles necessary for all pixel signal values to be reduced to zero. The printing elements are actuated for a number of printing time periods equal to the total number of cycles so that the ultimate density of each of the reproduced pixels equals the aggregate of the density gradation levels reproduced on the receiving sheet.
REFERENCES:
patent: 4513313 (1985-04-01), Kinoshita et al.
patent: 4731673 (1988-03-01), Yamakawa
patent: 5111217 (1992-05-01), Zeise
patent: 5200765 (1993-04-01), Tai
patent: 5300960 (1994-04-01), Pham et al.
Govaert Renee R.
Tack Henri M.
Agfa-Gevaert N. V.
Chauhan U.
Daniel William J.
Powell Mark R.
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