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Focusing Ink Jet Head

IP.com Disclosure Number: IPCOM000079829D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Krause, KA: AUTHOR

Abstract

An ink jet head is described in which the isostatic pressure created by a transducer is focused by a concave lens, so as to increase the efficiency of the print head.

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Focusing Ink Jet Head

An ink jet head is described in which the isostatic pressure created by a transducer is focused by a concave lens, so as to increase the efficiency of the print head.

Fig. A shows an ink jet head which employs a piezoelectric transducer and implements this concept. The piezoelectric transducer 1 is mounted behind a rear wall structure 3 of the head. Rear wall structure 3 has a concave shape within ink reservoir 5. The concavity is directed towards orifice 7 of the print head. Fig. A further shows a reservoir shaped in a conical fashion so as to further increase the efficiency of the head.

It should be noted that focusing by a concave lens may be introduced in various ways. For example, Fig. B shows a system employing a concave lens in which a magnetostrictive rather than a piezoelectric transducer is employed. Further, if the transducer were located within the reservoir and in direct contact with the ink, it would have a concave shape so as to function as a concave lens. This focusing effect is maximized at certain frequencies which are related to the concavity of the lens.

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