Digital image forming apparatus and method with variable duty ra

Details Digital image forming apparatus and method with variable duty ra Digital image forming apparatus and method with variable duty ra

1996-03-04

1998-02-03

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358300, 358448, 358458, 347143, 347144, 347253, H04N 129, H04N 140, G01D 1514, G01D 942

Patent

active

057150672

ABSTRACT:
In a digital image forming apparatus, when a latent image is formed on a photoconductor, a light from a light source is emitted in a period of a duty ratio while modulated according to image data, and the latent image is developed and transferred onto a sheet of paper. The duty ratio, defined as a ratio of a light-emitting time of a light exposing the photoconductor to a period for exposing a dot, is changed in the same document according to dot information on the document such as an edge signal. In the modulation of the optical intensity, the light emission onto the photoconductor is performed with a duty ratio which may be set for each dot. Image portions formed with different duty ratios may exist at the same time in a reproduced image. For example, an edge portion in a document is reproduced at the duty ratio of 100% while a non-edge portion is reproduced at the duty ratio less than 100%.

REFERENCES:
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patent: 5381221 (1995-01-01), Mizaguchi et al.
patent: 5420614 (1995-05-01), Fukui et al.
patent: 5477317 (1995-12-01), Edmunds et al.
patent: 5479175 (1995-12-01), Cianciosi et al.
patent: 5485289 (1996-01-01), Curry
patent: 5581292 (1996-12-01), Cianciosi et al.

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