Cathode-ray tube apparatus

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

Reexamination Certificate

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Details

C315S016000, C315S368150, C315S382000, C313S415000, C313S447000, C313S449000, C313S452000

Reexamination Certificate

active

07122977

ABSTRACT:
A prefocus lens section is formed by a screen electrode and an additional electrode. A main lens section is formed by a focus electrode, an anode electrode and an intermediate electrode that is disposed between the focus electrode and the anode electrode. Each of the focus electrode and the intermediate electrode has a cylindrical electrode on at least one of opposed faces thereof. The intermediate electrode and the anode electrode have cylindrical electrodes on opposed faces thereof. A voltage with a level higher than a focus voltage and lower than an anode voltage is applied to the additional electrode and the intermediate electrode.

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