Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1989-04-21
1990-07-03
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 313479, 313482, H01J 2907, H01J 2902
Patent
active
RE0332534
ABSTRACT:
A front assembly for a color cathode ray tube is disclosed that as having improved means for mounting components for electrical interconnection and magnetic shielding. The assembly comprises a faceplate having on its inner surface a centrally disposed, electrically conductive phosphor screen. A peripheral sealing area is located on the inner surface of the faceplate for receiving a funnel, and the funnel has an internal electrically conductive funnel coating adapted to receive a high electrical potential. A metallic shadow mask support structure is secured to the inner surface of the faceplate between the screen and the peripheral sealing area, and encloses the screen and is in contact with the screen. The structure supports in electrical union therewith a tensed foil shadow mask. The structure has a side adjacent to the sealing area essentially perpendicular to the screen which has secured thereto by weldments an internal magnetic shield. The assembly includes an electrical conductor located in an opening in the shield and in contact with the internal conductive coating of the funnel, whereby a high voltage connection is formed between the funnel coating, the screen and the mask.
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N.F. Fyler, "The CBS-Colortron: A Color Picture Tube of Advanced Design", Jan. 1954, pp. 326-334.
Robinder et al., "A High-Brightness Shadow-Mask Color CRT for Cockpit Displays", Tektronix, Inc., 12/83, pp. 72-73.
Horabik Michael
Yusko Donald J.
Zenith Electronics Corporation
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