Browse Prior Art Database

Obtaining Gray Scale in DSDT Tube

IP.com Disclosure Number: IPCOM000075520D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Kazan, B: AUTHOR

Abstract

In a deformographic storage display tube (DSDT), a visible output is produced only if the writing electron beam scans the target in the form of a finely-focused line or dot arrangement so that continuously varying electric fields are created. On the other hand, where the electron beam uniformly covers a relatively large area, a visible output may not be obtained over certain regions of the tube. This condition may result, for example, in the case where the electron beam is poorly focused and successive scanning lines overlap.

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Obtaining Gray Scale in DSDT Tube

In a deformographic storage display tube (DSDT), a visible output is produced only if the writing electron beam scans the target in the form of a finely- focused line or dot arrangement so that continuously varying electric fields are created. On the other hand, where the electron beam uniformly covers a relatively large area, a visible output may not be obtained over certain regions of the tube. This condition may result, for example, in the case where the electron beam is poorly focused and successive scanning lines overlap.

Thus, as shown in Fig. 1, for example, where the electron beam deposits a single line of charge on the mica surface, corresponding deformations occur in the gold film and underlying elastomer, which deformations may aptly represent the information intended to be stored by the controlled electron beam. However, where the information to be stored consists of a continuous charge, no deformations occur, except at the edges of such areas. Accordingly, no visible light is produced on the screen corresponding to such uniformly charged areas.

To obviate this difficulty a target structure, such as shown in Fig. 2, may be employed. In Fig. 2, the electron-beam side of the target is coated with a mesh of insulating material. such as SiO(2).

In operation, even if a uniform charge of relatively large area is deposited by the electron beam on the insulating mesh and exposed mica, varying electric fields will result acros...