Process and device for measuring targeting in color picture tube

Details Process and device for measuring targeting in color picture tube Process and device for measuring targeting in color picture tube

1993-06-11

1995-07-11

Groody, James J.

Television

Monitoring, testing, or measuring

Testing of image reproducer

348189, H04N 1700, H04N 1704

Patent

active

054325498

ABSTRACT:
A process for measuring a targeting of an electron beam that passes through a slot in a shadow mask in a multiple-beam color picture tube and strikes a phosphor stripe on a screen of the tube includes: exciting a luminous stripe in the phosphor stripe, recording an image of the luminous stripe with an image converter, determining outer edges of the phosphor stripe, generating an electron beam in the picture tube to illuminate a luminous spot on the phosphor stripe, recording an image of the luminous spot, determining positions of outer edges by analyzing the image of the luminous spot, and comparing locations of the outer edges of the phosphor stripe with the positions of the outer edges of the luminous spot to determine the targeting of the electron beam. If the respective outer edges do not substantially coincide, then the process includes generating a displaced electron beam with an auxiliary deflector to illuminate a displaced luminous spot having two outer edges perceptible by the image converter, and determining from a width and displacement of the displaced luminous spot the position of the outer edges of the displaced luminous.

REFERENCES:
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patent: 4001877 (1977-01-01), Simpson
patent: 4137548 (1978-01-01), Kelly et al.
patent: 4286164 (1981-08-01), Ragland, Jr.
patent: 4602272 (1986-07-01), Duschl
patent: 5049791 (1991-09-01), Kawakami
Proc. IEEE Int. Conf. Robotics & Automation 14. Mai 1992, Nice, France Seiten 993-998, XP299852 Z Bien et al. `Development of an automatic adjustment system for integrated tube components`.
Displays Bd. 7, Nr. 1, Januar 1986, Guildford GB, Seiten 17-29. P Keller `Resolution measurement techniques for data display cathode ray tubes` Seite 22, "Image disector and diode array scanning methods"*.
Prospectus of the Company, "Innovationstechnik, Bremen".

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