Method and apparatus for manufacture of cathode-ray tube

Details Method and apparatus for manufacture of cathode-ray tube Method and apparatus for manufacture of cathode-ray tube

1990-09-12

1992-12-01

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

Generating gas or vapor within an envelope, or coating by...

445 6, 445 55, H01J 938

Patent

active

051675552

ABSTRACT:
A method and an apparatus for manufacture of a cathode-ray tube where an electron gun for emitting a plurality of electron beams is enclosed in a tube body with discrete electrodes disposed individually to such beams and joint electrodes disposed commonly to the beams. The method comprises the steps of incorporating the electron gun in the tube body and applying high-frequency induction heat principally to the joint electrodes to thereby evacuate and seal up the tube body; flashing a getter material; and disposing at least a pair of cored coils on both sides of the tube body at positions opposite to the discrete electrodes disposed individually to the plurality of beams, and applying high-frequency induction heat principally to the discrete electrodes. Meanwhile, the apparatus is equipped with a high-frequency induction heating device having a pair of cored coils to execute the electron gun heating with certainty, hence realizing satisfactory manufacture of a high-reliability cathode-ray tube having a long service life.

REFERENCES:
patent: 1929212 (1933-10-01), O'Neill
patent: 2004646 (1935-06-01), Becker
patent: 3698786 (1972-10-01), Gronka
patent: 4131824 (1978-12-01), Nakai et al.
patent: 4410310 (1983-10-01), Halbrook
H. Armagnat, The Theory, Design, and Construction of Induction Coils, Transl. by O. A. Kenyon, McGraw, N.Y., 1908, pp. 49-56.

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