Abstract:
A field emission cathode comprises a glass substrate in combination with an insulating layer sandwiched between two conducting layers functioning as electrodes. Cavities extending through one of the electrodes and the insulating layer to the surface of the other electrode contain highly compacted and porous electron emissive layers which provide high electrical resistance between said electrodes and are diffused with metallic gold to form needle-shaped metal deposits on the surface as well as within the emissive layers. Such cathodes are used in image converters and image display tubes.
Abstract:
A planar member such as a phosphor coated fiber optic plate, having a thermal coefficient of expansion that is incompatible with that of a cathode ray tube faceplate, is accurately supported a precise distance from the inner surface of the faceplate by a plurality of glass posts having slots in which the peripheral portion of the fiber optic plate is disposed. A spring contact member affixed to at least one glass post applies a holding force to the fiber optic plate and makes electrical contact between the plate and a conductive coating on the inside of the tube envelope.
Abstract:
An improved scan-conversion device is provided in the form of a combination of two separate cathode-ray tube sections utilizing a common faceplate portion therebetween. A method of fabrication embodies peripherally sealing an envelope funnel to a first surface of the common faceplate, whereupon a cathodoluminescent screen is formed. Upon positioning and sealing an electron gun in the funnel portion of the first envelope, the envelope is evacuated, sealed and processed to provide a display-forming section. A target electrode is then formed on the outer surface of the common faceplate, and a second envelope funnel, having an electron gun positioned and sealed therein, is peripherally bonded thereto; whereupon the second envelope is evacuated, sealed and processed to provide a display-reading section oriented to directly cooperate with the display-forming section.
Abstract:
A transducer mosaic includes a plurality of spaced transducers formed with piezoelectric material for converting incident ultrasonic energy into an electrical signal. The piezoelectric is supported on one side by a pressure release barrier, suitably a conductive syntactic foam. The syntactic foam material is a mixture of miniscule hollow glass balls and conductive epoxy resin.