Finnegan, Henderson Farabow, Garrett and Dunner
Thermal printing device
 A printing device in which pulses corresponding in number to gradations to be visibly expressed are applied to the heat generating elements of a thermal had in such a manner that the heat generating elements are controlled in heat generation time. Image data storing means stores, as a recording unit of image data, image data of picture elements which can be recorded in one action. Gradation-to-bit-train conversion means receive the image data from the image data storing means in units of picture elements, and output bit trains representing the numbers of pulses according to the gradation to be expressed. Latch means latch the outputted bit trains thus outputted, selector means select bit for pulse application control from the latched bit trains, and count means cause the selector means to perform the selecting operation a predetermined number of times according to the gradation to be expressed, for all picture elements of each recording unit to control the number of pulses applied to each of the heat generating elements. 
Fuji Xerox Co., Ltd
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inventional inventional inventional
Nobuhisa
Kato