Abstract:
An evacuated envelope having a plurality of spaced, parallel support walls extending between and substantially perpendicular to flat substantially parallel front and back walls to provide a plurality of parallel channels extending along the front and back walls. The front and back walls and the support walls are of an electrically insulating material, typically glass. Compressed between each of the support walls and the front wall is a metal strip which serves as the tip of the support wall and which extends along the entire length of the support wall. Each tip is tapered in thickness from a thickness substantially equal to the thickness of the support wall at the support wall to a thinner thickness at the front wall. Means is provided between each metal tip and either the support wall or the front wall to prevent movement of the tip transversely of the channels. A shadow mask extends across each of the channels and extends between the metal tips and the support walls. The shadow mask is held in proper position with respect to the phosphor screen on the inner surface of the front wall by the metal tips.
Abstract:
An electron gun construction for cathode ray tubes which produces plural beams from a single electron gun having a single cathode and having a control grid and a first anode each of which have at least three beam apertures arranged for example to produce three vertically spaced beams. Focus and accelerating anodes for the plural beams are also provided. In a preferred tri-color example, the phosphor screen is made up of successive vertical sets of color-producing phosphor zones arranged in three, substantially horizontal rows of red, blue and green producing phosphor spaced in vertical succession and scanned by the three beams.
Abstract:
A cathode ray tube which produces plural beams from a single electron gun having a single cathode and having a control grid and a first anode each of which have at least three beam apertures arranged for example to produce three vertically spaced beams. Focus and accelerating anodes for the plural beams are also provided. The phosphor screen area is made up of plural parallel vertically spaced substantially horizontal bands of phosphor material. In a preferred tri-color example, each band is made up of three, substantially horizontal phosphor strips of red, blue and green producing phosphor spaced in vertical succession and scanned by the three beams.
Abstract:
A plural-layer dual persistence screen is incorporated in a CRT having defined low and high velocity electron beams. A first layer of an optically excited long persistence phosphor is formed on a supporting surface. A second layer of electron responsive material is laid thereover to provide the aforementioned optical excitation. Each particle of the second layer is peripherally modified to effect a barrier therearound to limit excitation of the unmodified interior to energy of the high velocity beam. The second screen layer has a thickness to absorb the electron energy impinged thereon. A third layer of short persistence electron responsive phosphor is disposed over the second layer to be impinged and excited by the low velocity beam.