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:
Sep. 20, 1994
Filed:
Jun. 15, 1992
Yasuki Matsumoto, Hirakata, JP;
Haruo Yamashita, Osaka, JP;
Yoshihiro Mushika, Neyagawa, JP;
Hideshi Ishihara, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A thermal head drive unit comprises electric power supply means for supplying electric power to heat-generating resistor elements arranged in a line in a thermal head. Head drive means is provided for electrically driving the heat-generating resistor elements in a lump by supplying electric power continuously variably in time to the heat-generating resistor elements depending on input gradation data. Head drive control means controls the head drive means in such a manner that, in a one-line recording time period composed of a power supply time during which electric power is supplied to the heat-generating resistor elements and an intermission time during which no electric power is supplied to the heat-generating resistor elements in disregard of the gradation data, the intermission time occupies a part not more than approximately 40% in the one-line recording time period.