Dynamic focusing device for cathode ray tube

Details Dynamic focusing device for cathode ray tube Dynamic focusing device for cathode ray tube

1993-09-29

1995-10-31

Groody, James J.

Television

Video display

Cathode-ray tube

348807, 348745, 31536811, 31536812, 31536813, H04N 928, H04N 326

Patent

active

054634270

ABSTRACT:
A dynamic focusing device for cathode ray tubes comprising a crosshatch pattern generator for providing a surface of cathode ray tubes with a crosshatch pattern indicating an adjustment point at which focusing control is carried out. The system uses correction data to achieve proper focus at each adjustment point, i.e., the intersection of the vertical and horizontal lines of the crosshatch pattern defined by arbitrarily divided blocks on the surface of the cathode ray tube. The data between adjacent adjustment points is interpolated in the vertical and horizontal directions to supply an output signal providing proper dynamic focus of the cathode ray tube. The disclosed device produces proper focus uniformity and is able to produce a high definition television image on direct-view devices or projection systems which utilize cathode ray tubes.

REFERENCES:
patent: 4549117 (1985-10-01), Takahashi et al.
patent: 4672275 (1987-06-01), Ando
patent: 5016075 (1991-05-01), Kii
patent: 5111284 (1992-05-01), Tsujihara et al.
patent: 5216497 (1993-06-01), Tsujihara et al.

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