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Grooved Nodal Ring Mount for Crystal

IP.com Disclosure Number: IPCOM000086704D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

McAllister, MR: AUTHOR

Abstract

An ink jet printer employes a liquid horn drop generator 11 (Fig. 2) having a piezoelectric crystal 13 which is excited at high frequency to create an ink drop pattern after the ink is expelled from the nozzle orifice 15. The piezoelectric crystal is clamped at its nodal diameter (point of least motion) by nodal ring mounts 17a and 17b. The electrically grounded face 19 (Fig. 1) of the crystal 13 is in contact with the ink. Ink may thus become trapped between the nodal contact point of the clamp 17b and the seal 21 around the crystal. When this happens, the trapped ink tends to become less fluid causing a change of crystal behavior.

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Grooved Nodal Ring Mount for Crystal

An ink jet printer employes a liquid horn drop generator 11 (Fig. 2) having a piezoelectric crystal 13 which is excited at high frequency to create an ink drop pattern after the ink is expelled from the nozzle orifice 15. The piezoelectric crystal is clamped at its nodal diameter (point of least motion) by nodal ring mounts 17a and 17b. The electrically grounded face 19 (Fig. 1) of the crystal 13 is in contact with the ink. Ink may thus become trapped between the nodal contact point of the clamp 17b and the seal 21 around the crystal. When this happens, the trapped ink tends to become less fluid causing a change of crystal behavior.

Additionally, as the temperature of the ink changes, the sensitivity of the crystal changes. Openings 23, in the nodal ring 17b at the crystal mounting point, allow the free flow of ink between the horn cavity 25 and the small cavity 27 containing the trapped ink. This reduces the change in response of the crystal with temperature change.

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