Projection cathode ray tube

Details Projection cathode ray tube Projection cathode ray tube

1992-04-13

1993-09-28

Bell, Janyce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 68, 427269, 4274191, B05D 506

Patent

active

052485188

ABSTRACT:
A projection cathode ray tube has an interference filter which is disposed at a boundary between a face plate and fluorescent layers. The interference filter is designed to be thinnest at the central area of the CRT and to become gradually thicker toward the peripheral area of the CRT, so that the CRT can produce a uniformly bright image over the central and peripheral areas. The fluorescent layers include a first layer composed of small fluorescent particles and a second layer composed of large fluorescent particles. With this first fluorescent layer, light beams emitted by the second fluorescent layer can be prevented from being reflected in multiple directions, thereby minimizing halo due to such multi-direction reflection of the light beams.

REFERENCES:
patent: Re29203 (1977-05-01), Branin
patent: 3275466 (1966-09-01), Kell
patent: 3639138 (1972-02-01), Shortes
patent: 4242371 (1980-12-01), Galves
patent: 4310784 (1982-01-01), Anthon et al.
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4642695 (1987-02-01), Iwasaki
patent: 4647812 (1987-03-01), Vriens et al.
patent: 4683398 (1987-07-01), Vriens et al.
patent: 4804884 (1989-02-01), Vriens et al.
patent: 4831307 (1989-05-01), Takenaka et al.

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