Thermal ink jet printer

Abstract

Abstract PURPOSE:To minimize cavitation damage to prolong a life time, by providing a resistance region and a conductive region electrically connected to the central part of said resistance region to a printing head. CONSTITUTION:A resistor 5 has a conductive region 23 surrounded by a resistance region 21 and both regions are formed on a silicon substrate 25 by a membrane method. A conductor 27 supplies a current pulse to the resistor 5. Because the conductive region 23 is constituted of a material having resistivity extremely lower than that of the material forming the resistance region 21 in the resistivity thereof, a cooling point is generated at the center of the resistor 5 when ring shaped air bubbles are formed in the ink to which a current pulse is applied. Said air bubbles are broken into a large number of smaller air bubbles during collapsing and the shock due to the breaking of these air bubbles is not concentrated to the small central region while randomly distributed to the surface of the resistor and, therefore, cavitation damage can be prevented.

Inventors

• 👤 Deebitsudo Meiyaa Jiyon
• 👤 ジヨン・デ−ビツド・メイヤ−

Bibliographic Details