Process for correcting across-the-head nonuniformity in thermal

Details Process for correcting across-the-head nonuniformity in thermal Process for correcting across-the-head nonuniformity in thermal

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

048272795

ABSTRACT:
A method and apparatus of the present invention corrects the nonuniformity in the printing density between the printing elements of a thermal print head by first printing across a transparent receiver with each element of the head activated with equal inputs (flat field). The print transmittance values are read from the transparent receiver using, for example, a microdensitometer, and an adjustment factor for each heating element is computed and maintained in storage to be combined with the number of heating pulses assigned to each of the respective heating elements as they perform their normal printing function.

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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