Method and apparatus for controlling the temperature of thermal

Details Method and apparatus for controlling the temperature of thermal Method and apparatus for controlling the temperature of thermal

1991-10-17

1992-09-01

Fuller, Benjamin R.

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Thermal recording

346140R, 400120, 400126, 400121, 34082552, 34082579, 34082581, 34082582, G01D 1500, H04N 1032, H04N 1034, B41J 235

Patent

active

051443368

ABSTRACT:
This disclosure presents methods for controlling the temperature of a thermal ink jet and thermal printhead so that the quality of black and white printing, gray-scale printing, and color printing is improved. The methods control the average residual power of the columns of resistors so that the average residual power of an addressed column has a prescribed relationship to the average residual powder of an unaddressed column. This is achieved by altering the magnitude of the drive voltage that drive the unaddressed resistors of the printhead matrix or by using nonprinting pulses. Methods for measuring the efficiency of the printhead are also presented.

REFERENCES:
patent: 3938136 (1976-02-01), Kawakami
patent: 4032925 (1977-06-01), Kos
patent: 4313684 (1982-02-01), Tazaki et al.
patent: 4490728 (1984-12-01), Vaught et al.

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