Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1993-01-21
1997-11-11
Frahm, Eric
Facsimile and static presentation processing
Facsimile
Recording apparatus
358459, 347128, H04N 140, G01D 1506
Patent
active
056870019
ABSTRACT:
The invention makes it possible to drive a halftone image device and achieve high halftone reproduction by allowing at least one of the leading and trailing edges of a pulse width-modulated signal applied to a recording head, or forming amplitude- and width-modulated pulses, respectively, as driving pulses for placing one dot under halftone control, and changing pulse width modulation in a stepwise manner, using the pulse width of the amplitude-modulated pulse as a unit pulse width.
The invention intends to achieve high-voltage and high-speed pulse output and low power consumption by converting input data such as halftone image data to a voltage signal, superposing pulse voltages of opposite polarities and applying the resulting signal to a switching circuit constituting an output state in the form of a switching signal, and also makes it possible to achieve high speed and high-voltage driving by connecting at least one of equivalent two-terminal elements in series to at least one of the respective driving elements of a complementary FET driving circuit, said equivalent two-terminal elements are each turned on with a current of a certain or higher value passing therethrough to show constant-voltage characteristics and turned off with a current of a certain or lower value passing therethrough to become a constant resistance.
REFERENCES:
patent: 4149183 (1979-04-01), Pellar et al.
patent: 4841313 (1989-06-01), Weiner
patent: 4992807 (1991-02-01), Thomson
patent: 5172132 (1992-12-01), Haneda et al.
Iijima Masayuki
Kadowaki Hiroyuki
Shibuya Akira
Shinbo Tomohiro
Dai Nippon Printing Co. Ltd.
Frahm Eric
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