Thermal print head modulation using additive complements

Details Thermal print head modulation using additive complements Thermal print head modulation using additive complements

2007-05-29

2007-05-29

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

C347S183000, C358S451000

Reexamination Certificate

active

09358811

ABSTRACT:
A thermal print head in a thermal printer for printing a digital image, the digital image being composed of lines of multi-bit pixels, the print head having a plurality of thermal resistors, adapted to be simultaneously addressed in parallel by a corresponding plurality of shift register elements, the print head being pulsed a plurality of times to print one line of the image. The print head is driven by providing a table of additive complement values, one additive complement value for each of the possible values of a multi-bit pixel, successively adding each of the complement values to each of the pixel values in a line to create a succession of sums, each sum having an overflow bit, and applying the overflow bits to the shift register elements to drive the print head.

REFERENCES:
patent: 5321427 (1994-06-01), Agar et al.
patent: 5321429 (1994-06-01), Ono et al.
patent: 5768411 (1998-06-01), Shu et al.

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