Hole-size measuring system for CRT black matrix layer

Details Hole-size measuring system for CRT black matrix layer Hole-size measuring system for CRT black matrix layer

1996-01-26

1998-04-28

Peng, John K.

Television

Monitoring, testing, or measuring

Testing of image reproducer

348 92, 348 93, 348180, 356378, 382144, H04N 1700

Patent

active

057451680

ABSTRACT:
A hole-size measuring system that enables measurement of the size of individual holes of a black matrix layer of a CRT. This system includes an imaging device for producing an enlarged image of holes of a black matrix layer, and an image processor for electrically processing the image produced by the imaging device to measure a size of the holes. A CCD camera may be used as the imaging device. The CCD camera may have an automatic focusing function and is movable along a black matrix layer. For a color CRT, the holes are divided into three groups for red, green and blue colors, and the image processor has functions of measuring an average size of selected ones of the holes in the respective groups.

REFERENCES:
patent: 3636362 (1972-01-01), Beeman et al.
patent: 3744905 (1973-07-01), Smith
patent: 3746455 (1973-07-01), Flamholz
patent: 4379308 (1983-04-01), Kosmowski et al.
patent: 4417274 (1983-11-01), Henry
patent: 4555798 (1985-11-01), Broadbent, Jr. et al.
patent: 5432549 (1995-07-01), Hassler et al.
patent: 5610710 (1997-03-01), Canfield et al.

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