Browse Prior Art Database

Isolated Mesh Flood Gun

IP.com Disclosure Number: IPCOM000086008D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Kozol, ET: AUTHOR

Abstract

Certain storage tubes use a two gun system which provides the respective functions of WRITE and ERASE. The deformographic storage display tube (DSDT) is such an example, cf. U.S. Patent 3,676,588. In DSDT, the write gun is generally aligned, i.e., on-axis, with the main axis of the tube whereas the erase or flood gun is aligned off-axis.

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Isolated Mesh Flood Gun

Certain storage tubes use a two gun system which provides the respective functions of WRITE and ERASE. The deformographic storage display tube (DSDT) is such an example, cf. U.S. Patent 3,676,588. In DSDT, the write gun is generally aligned, i.e., on-axis, with the main axis of the tube whereas the erase or flood gun is aligned off-axis.

The publication entitled "Uniform Electron-Beam Current Density Flood Gun" by A. Sansom, IBM Technical Disclosure Bulletin, Vol. 18, No. 10, March 1976, pp. 3340-3341, describes a flood gun structure which provides a resultant electron flood beam that is uniform across its pattern, and which has an angle of dispersion which is relatively independent of the drive applied to the beam. The structure is shown schematically in the figure and includes the thermionic emitter cathode 10, concentric and part spherical grid electrode 14, and concentric cylindrical electrode 20, which is an extension of the tube's ultor coating into the neck of the tube, which neck houses the flood gun.

When the write beam gun is actuated, undesirable fields in the main chamber of the tube envelope can result from the interaction of the ultor potential, e.g., 10 KV, and flood gun potential, e.g., 7.5 KV, if present. Such a situation can occur, for example, when there are simultaneous write and erase operations being performed.

To mitigate the formations of these undesirable fields and thus provide a field free region in the main cham...