U.S. Philips Corporation

Leslie H Francis

Colin D Overall

Robert J Baker

A cathode ray tube has an envelope comprising a mild steel rear housing (1) with a side wall portion (4) defining an opening over which a flat, glass, faceplate (2) is mounted. The faceplate is sealed in a vacuum tight manner using a compliant pressure bonded seal (10), comprising pressure deformable material such as lead, to the outer, flat surface of a flange (8) of the rear housing which projects inwardly of the opening from the side wall portion.

Cathode ray tube having a flat faceplate attached by a compliant

A cathode ray tube has a thin flexible circuit (48) comprising one or more films of polyimide with a plurality of conductive tracks deposited directly thereon for establishing electrical connection between a multi-pin lead through (45) passing through the wall of the tube's envelope (31) and terminals of electrically operable components within the envelope, e.g. electron gun (35) and beam-deflection electrodes (36,39 and 40). A number of track-carrying films may be stacked together to form a laminate structure. Such a flexible circuit avoids outgassing problems and, being thin and flexible, occupies minimal space and is easily routed around internal components to ease assembly.

Cathode ray tubes provided with flexible connectors

An envelope of a cathode-ray tube comprises a metal rear housing (1) and a glass face-plate (3) which is sealed in a vacuum-tight manner to a flange (2) on the rear housing by means of a seal (4) formed between the face-plate and the flange. To prevent the face-plate from peeling away from the seal and/or the seal from peeling away from the flange of the rear housing when the face-plate deflects inwards during evacuation of the envelope, spring clamps 5 are provided on the edges of the face-plate and flange, each clamp consisting of a spring-steel channel member with wall portions (9a and 9b) which converge towards the mouth of the channel member. The channel member, at parts (10a and 10b) thereof which bound or adjoin the converging wall portions where these portions are nearest one another, engage the front and rear surfaces (6 and 7) of the face-plate and the flange respectively to exert clamping forces on these surfaces in directions substantially perpendicular thereto. The clamps are especially suitable for envelopes in which the face-plate and the flange of the rear housing are of rectangular shape with straight edges.

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Horley, United Kingdom

Leslie H Francis