The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1988
Filed:
Apr. 28, 1986
Masaaki Mori, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A system for driving a thermal print head including a plurality of heat-producing elements which are activated selectively in accordance with digital image data obtained from an analog image signal is provided. In one aspect, the driving system is so structured to insert additional data between any two adjacent image data whenever the space between the two exceeds a predetermined level thereby allowing to maintain the dot density at constant when printed. In another aspect, the driving system controls the time period of activation of each of the heat-producing elements in accordance with preheat control data obtained by carrying out AND processing between each of the digital image data of one print line and the corresponding each of the digital image data of the next following print line. In a further aspect, the present driving system has a structure such that a reference point in a print line may be set at a desired location along the print line.