Abstract: An evacuated envelope includes substantially parallel front and back walls with a cathodoluminescent screen on the front wall. Within the envelope, in spaced relation to the back wall and substantially parallel to the screen, it is an electron beam guide comprising a pair of spaced apart, elongated guide grids having a plurality of apertures therethrough. At one end of the beam guide is an electron beam generating and directing means which directs at least one beam of electrons between the guide grids. A shielding member is disposed between the screen and the beam guide adjacent to the electron beam generating means.

Abstract: A system for controlling the emission of a device having a sense electrode for sensing a measure of an emission species from a source within the device. The sensed measure of the emission species is converted to a control signal. The output of the source is modified in response to the control signal by varying the time during which the source emits the emission species.

Abstract: In a display device a modulator structure may be formed by disposing on a surface of the back wall a plurality of first control electrodes. A modulator member having a smoothly continuous surface has disposed thereon a plurality of second control electrodes. The surfaces of the back wall and the top member having the electrodes thereon are joined together to form opposing pairs of control electrodes.

Abstract: An ion feedback electron multiplier has an envelope containing an ionizable gas. Within the envelope is a chain of multiplier dynodes divided into two planar groups spaced from and parallel to one another. At one end of the multiplier chain is an electron source capable of emitting electrons upon ion bombardment. An electron lens which is between the multiplier chain and the electron source, focuses the electrons from the source onto one of the dynodes of the multiplier.