Ink writing head with piezoelectrically excitable membrane

US4888598A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Joachim Heinzl · Munich, DE
• Manfred Lehmann · Cologne, DE
• Gunter Trausch · Hersbruck, DE

Key dates

• Filing date: Oct 11, 1988
• Grant date: Dec 19, 1989
• Expiry date: Oct 11, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B43/046
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An ink writing head comprising ink ejection channels and piezoelectric transducer elements allocated to the ink ejection channels, these transducer elements being supplied with writing fluid via supply lines, contains transducer elements comprising a first piezoelectrically excitable layer and a supporting layer firmly joined to the excitable layer. The piezoelectrically excitable layer comprises deflectable regions that are respectively subdivided into a peripheral and into a central region. For generating the needed excursion of the membrane, the regions of the membrane are driven such that the peripheral region is shortened, preferably by transversal contraction, and the central region is lengthened.