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Title:
PURITY ADJUSTING DEVICE
Document Type and Number:
Japanese Patent JPS5637772
Kind Code:
A
Abstract:

PURPOSE: To increase the efficiency for the purity adjustment, by applying the magnetic field to the side surface of the color TV cathode-ray tube via the magnetic field generator and then detecting the fluorescent width of the fixed pattern by giving a fixed shift to the position of the electronic beam.

CONSTITUTION: The electronic guns 5R, 5G and 5B of the color TV cathode-ray tube 1 are energized by the picture pattern generator 8 and the driving circuit 7 to secure the display of the prescribed picture pattern. And the mislanding state is caused at the periphery of the display screen 1a of the tube 1 by the magnetic field generator 9. The photoelectric detectors 11 and 12 are provided in opposition to each other at the periphery of the screen 1a, and then the fluorescent width is detected from the display beam of the picture pattern. The detection values of the detectors 11 and 12 are stored in the memory 14, and the prescribed operation is carried out by the arithmetic circuit 15 to obtain the degree of compensation. Based on this degree of compensation, the purity adjusting mechanism 16 is actuated to shift the purity magnet 4 until the degree of compensation becomes zero. After adjustment of the purity, a decision 13 is given to the propriety of the position of the deflecting yoke 2, and then the position adjusting mechanisms 17 is actuated in accordance with the degree of position shift to perform a position adjustment of the yoke 2.


Inventors:
UNO SHINICHI
SUZUKI NOBUKAZU
Application Number:
JP11324479A
Publication Date:
April 11, 1981
Filing Date:
September 04, 1979
Export Citation:
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Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H01J9/44; H04N17/04; (IPC1-7): H01J9/42