Electron gun for color CRT

Details Electron gun for color CRT Electron gun for color CRT

2006-09-12

2006-09-12

Santiago, Marceli (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

C313S414000, C313S412000, C313S413000, C313S416000

Reexamination Certificate

active

07105996

ABSTRACT:
An electron gun for a color CRT includes a main focusing lens unit that focuses the electron beams generated by a triode unit. The main focusing lens unit includes a first and a second electrostatic screen grid having three electron beam through holes linearly-arranged for passing three electron beams, two of the holes being external and an oval shaped hole that passes all three electron beams. The oval shaped holes being spaced a distance, d1and d2, respectively, from the through holes. Furthermore, the first grid external holes have an external distance HL1and an internal distance HR1and the second grid external holes have an external distance HL2 and an internal distance HR2; and wherein HL1is greater than HR1, HL2is greater than HR2, d1is greater than d2, HL2is greater than HL1, and HL2+HR2 is greater than HL1+HR1.

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patent: 6545403 (2003-04-01), Lee
patent: 002052847 (1981-01-01), None
patent: 07-142003 (1995-06-01), None

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