Cathode-ray tube apparatus

Details Cathode-ray tube apparatus Cathode-ray tube apparatus

2006-04-18

2006-04-18

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C315S382000

Reexamination Certificate

active

07030548

ABSTRACT:
A prefocus lens section is formed by a second grid and a third grid in a substantially rotation-symmetric fashion. A sub-lens section is formed by the third grid and a first segment. A main lens section is formed by a fourth grid and a fifth grid. The third grid is supplied with a voltage that is higher than a focus voltage and lower than an anode voltage. An electron beam, which is prior to entering the main lens section, is shaped to have a greater horizontal dimension than a vertical dimension.

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