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:
Jan. 16, 2001
Filed:
May. 09, 2000
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
The improved thermal head of the invention is the one having a protective film of a heater formed on the heater, the protective film comprising a ceramic-based lower protective layer composed of at least one sub-layer and a carbon-based upper protective layer formed on the lower protective layer, wherein a surface of the lower protective layer on which the upper protective layer is to be formed has a surface roughness value Ra of 0.005 to 0.5 &mgr;m; or the one in which the depth of a depression step which may be formed on the surface of the lower protective layer due to the thickness of the electrodes used for supplying power to the heater (or heat-generating resistor) was reduced to 0.2 &mgr;m or less. Therefore, the thermal head of the invention has a protective film which has significantly reduced corrosion and wear, which is advantageously protected from cracks and peeling-off due to heat and mechanical impact and which allows the thermal head to have a sufficient durability to exhibit high reliability over an extended period of time, thereby ensuring that the thermal recording of high-quality images is consistently performed over an extended period of operation.