Browse Prior Art Database

Deformographic Storage Display Tube Target Assembly

IP.com Disclosure Number: IPCOM000085816D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 30K

Publishing Venue

IBM

Related People

Kozol, ET: AUTHOR

Abstract

The spatial frequency (resolution) of a deformographic storage display tube (DSDT) target assembly 10, Fig. 1, is fixed by conductive mesh 1. A typical DSDT target assembly is described in U.S. Patent 3,676,588, entitled "Deformographic Target Assembly with Integral Conductive Member", E.T. Kozol and R.J. Wohl.

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Deformographic Storage Display Tube Target Assembly

The spatial frequency (resolution) of a deformographic storage display tube (DSDT) target assembly 10, Fig. 1, is fixed by conductive mesh 1. A typical DSDT target assembly is described in U.S. Patent 3,676,588, entitled "Deformographic Target Assembly with Integral Conductive Member", E.T. Kozol and R.J. Wohl.

Electrically continuous mesh 1 is provided adjacent the mica surface 2 of the DSDT target assembly 10 in facing relationship to the DSDT's writing electron gun G. Mesh 1, for example, may be formed by depositing a conductive pattern of a rectangular array of interconnected printed-circuit conductors X, Y on mica surface 2, cf.

Fig. 2. As such a pattern of rectangular holes H are provided in mesh 1. Alternatively, other patterns and/or geometrical configurations of holes may be employed. Holes H provide small isolated storage areas A in the mica 3 that are charged and discharged by electron beams of appropriate energy, depending upon the secondary emission characteristics of the storage substrate 3.

The resolution of the mesh in holes or lines/inch is selected for optimum performance depending upon the sensitivity of the deformable member 4.

The elastomer, i.e., polymer, deformable layer member 4 of assembly 10 can be made to various specified durometer or stiffness values. Conductive ground plane 5 is a reflective conductive member which compatibly deforms with elastomer layer 4. The deformations are a result of charges which are stored on mica substrate 3, cf. stored positive charges (+) in area A and resultant deformation 6 of layers 4 and 5, shown in outline for sake of clarity in Fig. 1.

Because mesh 1 is conductive, only the open areas A are charged and discharged by the electron beam. Moreover, any line, character or image is written at the spatial frequency of mesh 1. By causing surface breakdown to occur before elastomer 4 or ground plane 5 can fracture, target 10 is made substantially nondestructive.

In addition, mesh 1 also acts as a field shielding mesh so that selective erasure can be easily controlled. Mesh 1 may be disposed directly on surface 2. Alternately, it may be slightly spaced from surface 2, thus reducing coplanar capacity effects and thereby make the target assembly 10 more sensitive.

Mesh 1 mitigates the limiting resolution problem of DSDT. This limitation is caused by the line-to-line interaction during simultaneous operation of radial, i.e., rotative, scanning (rho theta) and rectilinear scanning. The effect is a degr...