Electron gun for color cathode ray tube

Details Electron gun for color cathode ray tube Electron gun for color cathode ray tube

1990-07-23

1993-03-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313414, 313449, H01J 2946, H01J 2956

Patent

active

051947781

ABSTRACT:
An electron gun for color cathode ray tube is disclosed which includes: a triode section for forming the thermionic electrons from the cathode into electron beams; a multistep focusing type electrostatic lens means for focusing the electron beams from the triode section. The characteristic feature of the present invention is that: an electrostatic lens is formed through the combination of a UPF type electrostatic lens and a BPF type electrostatic lens; and another UPF type electrostatic lens is formed between the electrodes disposed closely to the triode section among the UPF type or BPF type electrostatic lens forming electrodes, so as for a multiplex multistep focusing type electrostatic lens to be formed. According to the present invention, the spherical aberration acting on the electron beams at the main electrostatic focusing lens can be largely eliminated, and therefore, a high quality picture can be obtained.

REFERENCES:
patent: 4701677 (1987-10-01), Ashizaki et al.
patent: 4866335 (1989-09-01), Cho

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