Colour projection memory tube - uses Fabry-Perot filters with deforming mirror to deflect light beam

摘要

The target of the information projection tube is made from a dielectric surface which provides a deforming mirror (36) and a transparent series of Fabry-Perot filters (22). A writing electron-gun (16) forms a charge on the target which deforms the mirror surface. A light source (60) is directed through an optical system into the target and, due to the interference action of the filters, creates a coloured pattern on an optical screen (74). An erase-gun (28) is also provided. The target can be made of alternate layers of zinc sulphide and cryolite with a mirror of deposited silver. This provides colour projection of the electron-gun information instead of the black and white display in previous tubes using Schlieren optics.