Dot printer for reproduction of halftone images

Details Dot printer for reproduction of halftone images Dot printer for reproduction of halftone images

1981-07-30

1983-07-19

Miller, Jr., George H.

Recorders

Combined with external recorder operating means

Well logging

346140R, 346160, 358298, G01D 900, G01D 1518, H04N 122

Patent

active

043946623

ABSTRACT:
To overcome the tendency of the recording head of a dot printer to become inoperative in a range below a threshold level, a gray scale input signal is modulated with an oscillating signal so that the modulated signal oscillates above and below the threshold level to reproduce halftone values below the otherwise inoperative range.

REFERENCES:
patent: 3828357 (1974-08-01), Koeblitz
patent: 3977007 (1976-08-01), Berry et al.
patent: 4052715 (1977-10-01), Streifer
patent: 4071849 (1978-01-01), Koyano et al.
patent: 4086600 (1978-04-01), McClure et al.
patent: 4189754 (1980-02-01), Gamblin
patent: 4314261 (1982-02-01), Martinage

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