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Mercury Controlled Ink Jet

IP.com Disclosure Number: IPCOM000084637D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Lennemann, E: AUTHOR [+2]

Abstract

A multinozzle ink jet head 1 (Fig. 1) is arranged between pole pieces 2, 3 of a magnet. The head 1 consists of wafers 4 bonded to a stack.

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Mercury Controlled Ink Jet

A multinozzle ink jet head 1 (Fig. 1) is arranged between pole pieces 2, 3 of a magnet. The head 1 consists of wafers 4 bonded to a stack.

Each wafer 4 has a funnel-shaped pump chamber 5 (Fig. 2) with two preamalgamated electrodes 6, 7. These are in contact with a mercury pellet 8. The chamber behind pellet 8 is vented via 9 to permit motion of pellet 8. Below pellet 8 is a flux concentrator 10 of soft magnetic material, which is covered by an isolating layer 17.

Constriction 11 of the funnel merges with capillary feed channel 12.

Capillary feed channel 12 is directly fed from ink supply 13.

Nozzle 14 is in line with constriction 11 of pump chamber 5. The high-surface tension of mercury ensures self-sealing against ink on the surfaces of wafer 4. The vicinity 15 of nozzle 14 is shaped for double turbulence of the surrounding air. Turbulence caused by an ejected droplet 16 would tend to remove excess ink on nozzle 14.

Mercury pellet 8 lies directly in the magnetic field. When an electric current flows through pellet 8 it is subjected to a driving force. The polarity of this is such that pellet 8 is driven forward towards nozzle 14 by electrodynamic action. As the cross section of chamber 5 is much larger than that of constriction 11, hydraulic velocity amplification occurs between pellet 8 and constriction 11.

A current pulse through pellet 8 causes a high velocity ink column to be ejected from funnel constriction 11. The column shoots t...