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Ink Jet Printer Head

IP.com Disclosure Number: IPCOM000043393D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Usui, H: AUTHOR [+2]

Abstract

This article describes an on-demand-type ink jet print head which has a fluid activator located at the ink inlet port of the ink cavity. The fluid activator moves ink into the ink cavity to maintain ink meniscus at the outer edge of the nozzle after pressurized ink in the ink cavity is broken up into droplets at nozzle. Fig. 1 shows the concept of this article. The ink jet print head 1 includes an ink cavity 2, an ink inlet port 3, an nozzle 4 and a piezoelectric transducer 5. The piezoelectric transducer 5 periodically produces pressure waves in the ink within the ink cavity 2 to break up the ink into the droplets. More particularly, during period (a), meniscus 6 of the ink is maintained at the outer edge of the nozzle 4.

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Ink Jet Printer Head

This article describes an on-demand-type ink jet print head which has a fluid activator located at the ink inlet port of the ink cavity. The fluid activator moves ink into the ink cavity to maintain ink meniscus at the outer edge of the nozzle after pressurized ink in the ink cavity is broken up into droplets at nozzle. Fig. 1 shows the concept of this article. The ink jet print head 1 includes an ink cavity 2, an ink inlet port 3, an nozzle 4 and a piezoelectric transducer 5. The piezoelectric transducer 5 periodically produces pressure waves in the ink within the ink cavity 2 to break up the ink into the droplets. More particularly, during period (a), meniscus 6 of the ink is maintained at the outer edge of the nozzle 4. During period (b), the piezoelectric transducer 5 applies pressure to the ink to break it up into a droplet. During period (c), the piezoelectric transducer 5 returns to its initial flat shape, so that the meniscus 6 tends to move toward the ink cavity, which causes air bubbles to flow into the ink, resulting in a significant decrease of operational quality. To solve the problem, the fluid activator 7 is arranged at the ink inlet port 3, as shown by dashed line. Referring to Fig. 2, the fluid activator 7 comprises a magnetic field applicator including magnetic poles 8 and 9 and an electric field applicator including electrodes 10 and 11 and voltage source 12. The magnetic field applicator and the electric field applicator a...