Cathode ray tube with UPF type electron gun having particular electrode structure and spacing
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United States of America Patent
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Jun 24, 2003
Grant Date -
N/A
app pub date -
Mar 8, 2000
filing date -
Mar 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lens structure of a pre-focus part of an Hi-UPF electron gun to be used for a cathode ray tube has a cathode, a control electrode, an acceleration electrode, a first anode, a focus electrode and a second anode arranged in this order. The first anode and the second anode are to be commonly supplied with an anode voltage, and the focus electrode is to be supplied with a focus electrode. In a cathode ray tube of this construction, in the pre-focus part, the control electrode has an electrode beam passage hole of 0.57 mm or smaller and the distance in the vicinity of the electron beam passage hole between the acceleration electrode and the first anode is 1.9 mm or smaller.
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