Method for measuring the convergence of a three-gun shadow-mask

Details Method for measuring the convergence of a three-gun shadow-mask Method for measuring the convergence of a three-gun shadow-mask

1984-03-21

1987-01-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

315368, H04N 1702

Patent

active

046350950

ABSTRACT:
Monochrome bar patterns approximately seven millimeters in width are produced on the screen of a three-color television picture tube by means of a video signal having a substantially Gaussian waveform. The value of the convergence component is given by the distance between centers of two bars of different colors. Measurement of convergence is carried out by means of a photosensor consisting of a charge-coupled photosensitive strip and an optical system comprising a biconvex lens and a cylindrical lens.

REFERENCES:
patent: 4001877 (1977-01-01), Simpson
patent: 4316211 (1982-02-01), Mackey et al.
patent: 4364079 (1982-12-01), Pons
patent: 4441120 (1984-04-01), Gerritsen
patent: 4551748 (1985-11-01), Mattle

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