Image forming apparatus, and modulating method therein

Details Image forming apparatus, and modulating method therein Image forming apparatus, and modulating method therein

1993-08-17

1996-01-30

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358445, 358298, 327258, H04N 123, H03K 5135, H03K 514

Patent

active

054884870

ABSTRACT:
A multivalued input recording signal is subjected to pulse-width modulation at a time unit shorter than the period of a clock signal within the period of the recording signal. Alternatively, the multivalued input recording signal is converted into a plurality of different signals each of whose length of time is shorter than a clock signal within the period of the recording signal, thereby performing pulse-width modulation in accordance with a predetermined weighting. This makes it possible to obtain a highly toned recording signal without raising the frequency of the clock signal. Further, density tone data is generated in dependence upon inputted multivalued pixel data, and control is performed using both the irradiation time and emission intensity of a light beam based on the generated density tone data. An image is formed by irradiating a photosensitive body with the controlled light beam.

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