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SYMMETRICAL INK JET DRIVER WITH CONTROLLABLE ZERO MOTION NODAL POINT

IP.com Disclosure Number: IPCOM000025205D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 87K

Publishing Venue

Xerox Disclosure Journal

Abstract

One of the difficulties with ink jet drivers lies in attempting to control the placement of the zero motion nodal point. The placement is important because it determines where vibration will occur and therefore, what part of system will vibrate with what force. Since it is advisable to be able to maximize or minimize the placement of movement within the structure of a driver assembly, the idea of symmetry is one way to control the nodal point and thus the placement of the maximum drive force.

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XEROX DISCLOSURE JOURNAL

SYMMETRICAL INK JET DRIVER WITH CONTROLLABLE ZERO MOTION NODAL POINT Int. C1. Cold 15/18 Roger R. D. Snyder

Proposed Classification
U.S. C1. 346/75

One of the difficulties with ink jet drivers lies in attempting to control the placement of the zero motion nodal point. The placement is important because it determines where vibration will occur and therefore, what part of system will vibrate with what force. Since it is advisable to be able to maximize or minimize the placement of movement within the structure of a driver assembly, the idea of symmetry is one way to control the nodal point and thus the placement of the maximum drive force.

The practical side of symmetrical assembly leaves a set of problems concerning the dimensions of the assembly. If the operating frequency of the system is in the range of several hundred kilohertz, the dimensions of the assembly become relatively small and any. structural material which is thick enough to be of adequate structural strength is likely to be sufficiently thick to shift nodal points dramatically. The result leaves only a gross ability to position minimum and maximum motion points. This, in turn, causes unwanted vibration within the driver and unwanted wavefronts in the fluid medium.

The simplest method of constructing a driver to obtain a known zero motion point is to construct a driver that is symmetrical in the plane of the driving force. This naturally places the zero motion nodal point in the center of driver assembly. If this centerline is used as the mounting point it means that minimum motion is transferred to the assembly which is directly connected to the ac'tual driver. The result is that maximum motion is applied to the end of the driver an...