Browse Prior Art Database

Drum Head Type Screen Grid

IP.com Disclosure Number: IPCOM000086921D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Ruckel, RR: AUTHOR [+3]

Abstract

Mobility analyzers have been developed in which ions of trace substances in a gas are moved in an electric field and collected at a plate. A screen grid is located adjacent the collection plate and functions to minimize the induction of secondary currents in the collection plate as the ions approach. The screen grid is constructed of intermeshed fine wires and one of the problems that arises with operation of apparatus of this type is due to vibrations or movements of the wires of the screen grid. The screen grid is electrically biased so that the movements tend to induce unwanted currents in the collection plate.

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Drum Head Type Screen Grid

Mobility analyzers have been developed in which ions of trace substances in a gas are moved in an electric field and collected at a plate. A screen grid is located adjacent the collection plate and functions to minimize the induction of secondary currents in the collection plate as the ions approach. The screen grid is constructed of intermeshed fine wires and one of the problems that arises with operation of apparatus of this type is due to vibrations or movements of the wires of the screen grid. The screen grid is electrically biased so that the movements tend to induce unwanted currents in the collection plate.

The drawing shows a way in which the screen grid can be constructed so as to place the various wires making up the grid in tension and, thereby, to minimize unwanted movement. As shown, a support ring is provided with an annular hub over which the mesh forming the grid is placed. A compression ring is pressed over the mesh so as to pull the wires of the mesh tight and secure the mesh in place

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