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. 16, 1995
Filed:
Mar. 15, 1994
Michio Ishijima, Kyoto, JP;
Takaya Nagahata, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
An electric erosion can be prevented from occurring in a thermal head when a bias voltage is being applied to the thermal head on non-printing. When the bias voltage is being applied to heating resistance elements in the thermal head on non-printing, a motor drive circuit causes a motor to rotate a platen roller so that a heat-sensitive medium will be delicately moved to change the moisture on the surfaces of the heating resistance elements. Alternatively, preliminary pulses may be intermittently applied to a driver IC through a head drive circuit to energize the heating resistance elements sufficiently not to color the heat-sensitive medium so that the moisture on the surfaces of the heating resistance elements will be evaporated to avoid the electric erosion in the thermal head.