Image forming method and apparatus using rotated screen with pul

Details Image forming method and apparatus using rotated screen with pul Image forming method and apparatus using rotated screen with pul

1997-02-27

1998-04-14

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347247, 347135, 347132, 347134, 358298, B41J 247, B41J 2385, G01D 1514, H01N 121

Patent

active

057398429

ABSTRACT:
Image forming apparatus and method for forming half tone images by pulse width modulating multi-valued image signals comprises first and second pattern signal generators which generate pattern signals each having the same period and a phase shifted from each other, first and second pulse width modulators for pulse width modulating said image signals using the first and second pattern signals, respectively, a selector for selecting either of the first and second pulse width modulated signals and a controller for controlling the selector to obtain a screen angle of 45.degree..
Further, image forming apparatus and method which realizes a screen angle .theta. wherein tan .theta. is represented by a rational number.

REFERENCES:
patent: 5155599 (1992-10-01), Delabastita

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