Filter for visual display devices and the method of its manufact

Details Filter for visual display devices and the method of its manufact Filter for visual display devices and the method of its manufact

1990-06-11

1992-01-28

Boudreau, Leo H.

Electric lamp and discharge devices

Cathode ray tube

Screen

313478, 358252, 428 68, H01J 2910, H05K 900, B32B 330, B32B 2712

Patent

active

050846493

ABSTRACT:
A filter consists of a base made of transparent thermoplastic resin and of a black meshed screen made of such resins as nylon and polyester. The black meshed screen, which is coated with carbon, is heated and pressed against the transparent base to embed it in one side of the base. The base is then heated and deformed into a convex shape so that the side where the black meshed screen is embedded is expanded. The deformed base is cooled while it is kept in the convex shape. As a result, a number of indented portions enclosed by the individual meshes are formed in the base because of a difference in thermal shrinkage coefficient between the base and the meshed screen. When external light is radiated against the filter, the indented portions on the base scatter the light, thus reducing the unwanted glare on the CRT screen. The carbon coated on the meshed screen absorbs incoming external light, further enhancing the glare prevention effect of the filter. The black meshed screen also contributes to a substantial improvement in the contrast of the displayed picture.

REFERENCES:
patent: 3898509 (1975-08-01), Brown, Jr. et al.
patent: 4562481 (1985-12-01), Trakas
patent: 4631214 (1986-12-01), Hasegawa
patent: 4661856 (1987-04-01), Schnack
patent: 4745518 (1988-05-01), Fang
patent: 4755716 (1988-07-01), Hayafune et al.
patent: 4945282 (1990-07-01), Kawamura et al.

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