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:
Mar. 08, 2011
Filed:
Jun. 19, 2007
Teruhisa Sako, Kyoto, JP;
Naofumi Kanei, Kyoto, JP;
Teruhisa Sako, Kyoto, JP;
Naofumi Kanei, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A thermal printhead (A) includes an insulating substrate and a heating resistor element () formed on the substrate and elongated in the primary scanning direction. A plurality of electrodes are connected to the heating resistor element (). The electrodes and the heating resistor element () are covered by a protective film (). The protective film () includes a first layer (), a second layer () and a third layer (). The second layer () is porous and includes a plurality of pores (). The third layer () partially enters each of the pores () so that the upper surface pf the protective film () is an irregular surface including a plurality or recesses ().