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Browse Prior Art Database

Ink on Demand Using Silicon Nozzles

IP.com Disclosure Number: IPCOM000086958D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR [+2]

Abstract

This is an ink-drop-on-demand printing system requiring low drive voltages due to the amplification effect of a nozzle having the shape of a truncated pyramid, a cone, etc.

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Ink on Demand Using Silicon Nozzles

This is an ink-drop-on-demand printing system requiring low drive voltages due to the amplification effect of a nozzle having the shape of a truncated pyramid, a cone, etc.

In Fig. 1 a head assembly 2 has a semiconductor wafer 4, which, for example, may be silicon, mounted therein. A nozzle 6 in the form of a truncated pyramid is etched in the silicon wafer using standard etching techniques, with the larger diameter of the nozzle forming an entrance aperture and the smaller diameter of the nozzle forming an exit aperture. Channels 8 and 10 are also etched in the silicon wafer for providing fluid flow paths for the printing ink.

Ink is supplied from a reservoir (not shown) to a cavity 12 with the ink then flowing through the channel 8 into the nozzle 6, through the channel 10, through a cavity 14 and back to the reservoir. This circulation system removes air bubbles from the ink and the pressure of the ink is sufficient to form a meniscus on the exit aperture of the nozzle.

A backing plate member 16 is formed within the assembly 2 and has a thin- film piezoelectric crystal 18 which is centered within the nozzle 6, mounted thereon. A line 19 is connected to the crystal 18 such that when a pulse is provided to the line 19 the backing plate member is caused to flex, thereby emitting a droplet from the exit aperture of the nozzle. Due to the amplification characteristic of the nozzle 6, low drive voltages may be utilized in the syst...