Device and process for measuring an electron density distributio

Details Device and process for measuring an electron density distributio Device and process for measuring an electron density distributio

1993-06-16

1994-06-21

Groody, James J.

Television

Monitoring, testing, or measuring

Monitor

348811, H04N 1702

Patent

active

053232313

ABSTRACT:
The invention concerns the measurement of the radiant density of electron beams from shadow mask tubes. According to a known process, the beam is displaced on the screen and pictures are taken of the light spot areas, as they are detected by the effect of apertures when the beam has been displaced. The pictures are then evaluated with respect to their luminance distribution. This process requires an extraordinary number of adjustments. For that reason the invention states that the pictures are taken by an image converter camera, that light spots are produced over the entire field of view of the image converter, which serve as simulated apertures for the detection of light spot sections and that, to determine the luminous density distribution, the displacement width is selected so that the light spot sections that were detectable before a displacement step can no longer be detected after the displacement step, that the camera takes a picture before the first and after each displacement step, and that all the pictures are stored and composed into a total picture of the light spot distribution.

REFERENCES:
patent: 4602272 (1986-07-01), Duschl
Displays, Bd. 7, Nr. 1, Jan. 1986, Guildford GB Seiten 17-29 P. Keller `Resolution measurement techniques for data display cathode ray tubes`.
SID International Symposium: Digest of Technical Papers, Mai 1987, New Orleans, US Seiten 225-227. D Bortfeld et al `Semi-automatic measurement of the two-dimensional intensity distribution of a color CRT electron-beam spot` Seite 225, Measurement Techniques.

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