Image forming apparatus

Details Image forming apparatus Image forming apparatus

1995-10-18

1998-06-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358296, 358443, 358452, 358453, 395112, 395114, H04N 121, B41B 1500, G06F 1500

Patent

active

057643784

ABSTRACT:
The present invention provides an image forming apparatus including first image density signal converter having a first conversion property for converting a multi-valued image density input signal to an image density output signal at a timing synchronizing with an image density signal clock, second image density signal converter having a second conversion property different from the first conversion property for converting a part of the image density input signal corresponding to a low density portion to an image density output signal indicating a value within a range in which an image is not developed, selection signal generator for outputting a selection signal having a period longer than that of the image density signal clock to select the first or second image density signal converter in a predetermined order, a phase of the selection signal being shifted in turn per every one or more main scanning synchronizing signals, pattern signal generator means for generating a pattern signal having a period longer than that of the image density signal clock, controller for shifting the phase of the pattern signal generated by the pattern signal generator means per every one or more main scanning synchronizing signals to form a screen image having a predetermined screen angle, a pulse width modulator for outputting a pulse width modulation signal generated by modulating pulse width of the image density output signal output from the first and second image density signal converter utilizing the pattern signal. An image is formed in accordance with the pulse width modulation signal output from the pulse width modulator.

REFERENCES:
patent: 4999718 (1991-03-01), Arai
patent: 5140349 (1992-08-01), Abe et al.
patent: 5194879 (1993-03-01), Kotabe et al.
patent: 5272544 (1993-12-01), Sakai et al.
patent: 5416506 (1995-05-01), Arai et al.
patent: 5450212 (1995-09-01), Asada
patent: 5477257 (1995-12-01), Murata
patent: 5495341 (1996-02-01), Kawana et al.
patent: 5519500 (1996-05-01), Kumamoto

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