Beam focusing means in a unitized tri-potential CRT electron gun

Details Beam focusing means in a unitized tri-potential CRT electron gun Beam focusing means in a unitized tri-potential CRT electron gun

1980-10-15

1983-02-15

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2950, H01J 2956

Patent

active

043743412

ABSTRACT:
Means for achieving improved focusing of shaped electron beams are introduced into the low focusing electrode member of the multi-electrode distributed focusing lens of at least one of the gun structures in a CRT plural beam tri-potential in-line electron gun assembly. This improvement is in the form of a pair of substantially planar insert elements, one of which is horizontally positioned on either side of a forward aperture of the unitized low focusing electrode. These impart correctional influences to asymmetrics in the respective lensing field, and aid in alleviating subsequent spherical aberration of the shaped beam, thereby achieving a desired circular beam spot landing at the center of the screen.

REFERENCES:
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4208610 (1980-06-01), Schwartz
patent: 4275332 (1981-06-01), Ashizaki et al.

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