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IP.com Disclosure Number: IPCOM000080429D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Costa, MJ: AUTHOR

Abstract

Fig. 1 shows a sectional view of a portion of a target in a display of the type in Which a metal film is deformed, so that light that is reflected from the film can be used to provide a viewable image. The metal film is supported on an elastomer layer and the deformations are produced by the electrostatic forces of charges that are deposited on an insulating layer of mica. An electron beam produces charges on the mica layer in a pattern to produce the desired image. These components in the drawing are conventional.

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Fig. 1 shows a sectional view of a portion of a target in a display of the type in Which a metal film is deformed, so that light that is reflected from the film can be used to provide a viewable image. The metal film is supported on an elastomer layer and the deformations are produced by the electrostatic forces of charges that are deposited on an insulating layer of mica. An electron beam produces charges on the mica layer in a pattern to produce the desired image. These components in the drawing are conventional.

As electrons strike the mica, they cause the mica to emit secondary electrons. Depending on the target potential, the number of secondary electrons may be greater or less than the number of electrons supplied by the electron gun, so that the mica can be made either positive or negative according to the target potential. This relationship is shown in Fig. 2.

The target of the drawing has a collector mesh located close to the mica and maintained at a potential designated V2. This mesh changes the normal ratio of secondary electron emission (the solid line in Fig. 2), so that at a target potential of V2 the new function (the dashed line) crosses from a ratio greater than one for lower potentials to a ratio less than one for higher potentials. Thus, for a target potential greater than V3 and less than V2, the electron beam leaves a positive charge on the mica; for a potential greater than V1 and less than V2, the electron beam leaves a...