Process for correcting down-the-page nonuniformity in thermal pr

Details Process for correcting down-the-page nonuniformity in thermal pr Process for correcting down-the-page nonuniformity in thermal pr

1988-06-16

1989-05-02

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, G01D 1510

Patent

active

048272817

ABSTRACT:
The present invention provides a method for correcting the density nonuniformities that occur down the page of a thermally printed document by providing a correction component, representing heating pulses, to each thermal printing element as a function of the line on which the thermal printer is printing. The correction component is determined from the product of a correction factor times the logarithm of the total number of lines to be printed divided by the number of the line next to be printed. The correction factor is calculated from the average number of heat pulses to be applied across the head at any time, or as a compromise a single number may be selected.

REFERENCES:
patent: 4284876 (1981-08-01), Isibashi et al.
patent: 4415904 (1983-11-01), Inui et al.
patent: 4449136 (1984-05-01), Moriguchi et al.
patent: 4536774 (1985-08-01), Inui et al.
patent: 4574293 (1986-03-01), Inui et al.
patent: 4587530 (1986-05-01), Noguchi
patent: 4688051 (1987-08-01), Kawakami et al.

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