Color picture tube having an inline electron gun with an einzel

Details Color picture tube having an inline electron gun with an einzel Color picture tube having an inline electron gun with an einzel

1987-07-20

1988-05-17

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2662

Patent

active

047453311

ABSTRACT:
The present invention provides an improvement in color picture tubes. Such tubes include an electron gun for generating and directing three inline electron beams, a center beam and two side beams, along initially coplanar paths toward a screen of the tube. The gun includes a plurality of spaced electrodes which form a main focus lens for focusing the electron beams. The improvement comprises the plurality of spaced electrodes which form a main focus lens including three electrodes that form an einzel lens in the path of each electron beam. A first einzel lens electrode includes three inline cylinders through which the electron beams pass. A second einzel lens electrode includes a large oval cylinder that overlaps all three cylinders of the first einzel lens electrode. A third einzel lens electrode includes three inline cylinders which are overlapped by the oval cylinder. The oval cylinder includes means for shaping the main focus lens to focus the three electron beams stigmatically near ground potential and to converge the outer beams at the center of the screen.

REFERENCES:
patent: 3448316 (1969-06-01), Yoshida et al.
patent: 3898521 (1975-08-01), Saito et al.
patent: 3949262 (1976-04-01), Ohkoshi et al.
patent: 4178532 (1979-12-01), Fukuzawa et al.
patent: 4232246 (1980-11-01), Sakurai et al.
patent: 4686420 (1987-08-01), Kamohara

Affiliated with

Also associated with

Rating

Color picture tube having an inline electron gun with an einzel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color picture tube having an inline electron gun with an einzel , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color picture tube having an inline electron gun with an einzel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1883258