Image forming apparatus capable of forming an image by dots havi

Details Image forming apparatus capable of forming an image by dots havi Image forming apparatus capable of forming an image by dots havi

1990-10-09

1992-09-01

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, H04N 121

Patent

active

051443376

ABSTRACT:
An image forming apparatus capable of changing the diameter of a dot in the main and subscanning directions to form various kinds of dots and thereby high resolution images with tones. A data converting circuit separates input image data into pulse width modulation data and power modulation data and distributes them to a pulse width modulating circuit and a power modulating circuit. The pulse width modulating circuit changes the duration of a laser beam issuing from a laser diode to change the diameter of a dot in the main scanning direction. The power modulating circuit changes the exposing energy of the laser beam per unit area and unit time in order to change the dot diameter in the subscanning direction. The modulating circuits control an image writing device in cooperation so as to produce a high resolution image with tones.

REFERENCES:
patent: 4307408 (1981-12-01), Kiyohara et al.
patent: 4905023 (1990-02-01), Suzuki

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