Manufacturing method of color cathode ray tube

Details Manufacturing method of color cathode ray tube Manufacturing method of color cathode ray tube

2006-01-27

2008-12-30

Assouad, Patrick J (Department: 2862)

Photography

Exposing multicolor cathode-ray tube targets

C445S047000

Reexamination Certificate

active

07471894

ABSTRACT:
A correction filter used in the exposure for forming a phosphor screen includes three kinds of correction filters consisting of a grading filter, a monochroic local correction filter and a multi-color local correction filter. With the use of three kinds of correction filters, it is possible to improve the whiteness uniformity which may be degraded due to the wall thickness difference at the center and a peripheral portion of a panel portion of a flat-face-type color cathode ray tube.

REFERENCES:
patent: 6091191 (2000-07-01), Togawa
patent: 2005/0104494 (2005-05-01), Yotani et al.

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