Cathode ray tube device having insulator coating
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKouji Nakamura
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Abstract
A CRT having a glass faceplate for forming an image display surface and a metal funnel connected to a peripheral part of the faceplate and forming a side wall. The glass faceplate has a phosphor screen coated on the inside surface and a metal film covering the phosphor screen. A high voltage of 25 KV is applied to the metal film, while the metal funnel is grounded. An insulating layer covers adjacent inside areas of the funnel and faceplate, thereby increasing the distance between the metal film and exposed surfaces of the funnel and preventing creeping discharges.
Claims7
A cathode ray tube for an image display comprising:
- a glass faceplate forming an image display surface;
- said metal funnel connected to a peripheral part of said faceplate and forming a side wall;
- a phosphor screen coated on an inside surface of said faceplate;
- a metal film covering said phosphor screen, said metal film being spaced from metal funnel along the peripheral part of said faceplate;
- and
- an insulating layer covering mutually adjacent inside areas of said metal film and said faceplate.
Dependencies are inferred from the claim text.