Digital image forming apparatus

Details Digital image forming apparatus Digital image forming apparatus

1997-11-24

1999-12-21

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358401, 358486, 358522, 395109, G06K 1500

Patent

active

060060107

ABSTRACT:
In a digital image forming apparatus, a document image is read as digital data, and an image type of bi-level image or multi-level image is discriminated from the digital data. For a bi-level image, an intensity of laser beam for exposing a photoconductor is modulated according to the image data with a duty ratio of 100%. On the other hand, for a multi-level image such as a photograph image, the intensity of laser beam is modulated with a duty ratio in the unit of two or more dots according to the image data. The duty ratio and the laser output power are changed according to a type or document image or according to sensitivity characteristic of the photoconductor.

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