Electron gun of CRT and manufacturing method therefor

Details Electron gun of CRT and manufacturing method therefor Electron gun of CRT and manufacturing method therefor

1994-06-20

1996-05-07

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313446, 313447, 313456, H01J 2904, H01J 0120

Patent

active

055149308

ABSTRACT:
An electron gun cathode structure includes a support member made of an insulating material, a first grid fixed to the support member, and a cathode disposed on the side of the support member opposite to the first grid. A thermal expansion .DELTA.L.sub.s /L.sub.s of the insulating material constituting the support member due to heat from the cathode is larger than a thermal expansion .DELTA.L.sub.G /L.sub.G of a material constituting the first grid due to heat from the cathode. A manufacturing method of an electron gun cathode structure includes preparing a member including a first face and a second face having a step therebetween, a height of the step being equal to a predetermined distance d.sub.12, placing a first grid on the first face, placing a spacer on the second face, placing an insulating support member on the first grid and the spacer, and grinding a top surface of the spacer opposite to its surface that is fixed to the support member so that an actual distance d.sub.12 becomes a desired value. Further, a distance d between the top surface of the spacer and a cathode is measured with a non-contact type distance measuring instrument, and a position of the cathode with respect to the first grid is so set that a difference d-d.sub.12 becomes a desired value.

REFERENCES:
patent: 4298818 (1981-11-01), McCandless
patent: 4468588 (1984-08-01), Schlack et al.
patent: 4629934 (1986-12-01), Wright
patent: 4631443 (1986-12-01), Villanyi
patent: 4633130 (1986-12-01), McCandless
patent: 4649317 (1987-03-01), Opresko

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