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

1992-11-10

1995-12-19

Fuller, Benjamin R.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347132, 347134, 358300, 358296, H04N 1387

Patent

active

054772575

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: 4499489 (1985-02-01), Gall et al.
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4847654 (1989-07-01), Honma et al.
patent: 4980757 (1990-12-01), Nishigaki
patent: 5038298 (1991-08-01), Matsumoto et al.
patent: 5253082 (1993-10-01), Hayashi et al.

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