Testing apparatus for displaying scanning beam spot size and lin

Details Testing apparatus for displaying scanning beam spot size and lin Testing apparatus for displaying scanning beam spot size and lin

1987-10-19

1988-08-30

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

324404, 328187, 328188, H04N 1704

Patent

active

047680911

ABSTRACT:
Testing apparatus in accordance with the invention generates a composite video signal for a CRT which produces a scanning line raster on the video screen thereof clearly displaying the spot size and line focus of the scanning electron beam generating such raster. The display consists of a single scanning test line of high luminance, or white, within an intermediate low luminance or black portion of an otherwise white scanning line raster. The test line is segmented, with black gaps at several discrete locations thereon, each gap being approximately three times the width of the scanning beam spot. Centered within each such gap is a region of high luminance, or white, of a width approximately that of the beam spot. The line focus and spot size of the smallest possible picture element is thereby accurately displayed and so can be measured on the video screen, enabling adjustment of the focussing components for optimum focus.

REFERENCES:
patent: 4536792 (1985-08-01), Harshbarger
patent: 4568975 (1986-02-01), Harshbarger

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