Image forming apparatus including a pulse width modulator

Details Image forming apparatus including a pulse width modulator Image forming apparatus including a pulse width modulator

1994-09-09

1996-02-27

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

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H04N 121

Patent

active

054952786

ABSTRACT:
In an image forming apparatus including a pulse-width modulating unit for subjecting an image-density signal to pulse-width modulation and an image-forming unit for forming an image in accordance with a pulse-width modulation signal outputted by the pulse-width modulating unit, an arrangement is provided such that the image is formed with a small number of lines when the image density is a low density, while the image is formed with a large number of lines when the image density is a medium/high density. In an example of the arrangement thereof, the pulse-width modulating unit has a unit for effecting modulation on the basis of a plurality of different modulation periods, and is provided with a selecting unit for selecting a modulation period of a pulse-width modulated wave to be outputted, in accordance with the image-density signal.

REFERENCES:
patent: 4870499 (1989-09-01), Suzuki et al.
patent: 5153609 (1992-10-01), Ando et al.

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