Electron gun for cathode ray tube
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 10, 2003
Issued Date -
N/A
app pub date -
Feb 9, 2000
filing date -
Apr 1, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection type cathode ray tube has a panel and an electron gun. The electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals. The second anode has a first cylindrical portion at the panel side and a second cylindrical portion at the cathode side, the first cylindrical portion having a larger inner dinner diameter than the inner diameter of the second cylindrical portion. The focus electrode has a panel side cylindrical portion with an inner diameter D1 and a length L1, an intermediate cylindrical portion with an inner diameter D3 and a length L3, and a cathode side cylindrical portion with an inner diameter D2 and a length L2. The inner diameters D1, D2, and D3 are different from each other. The focus electrode also has a first funnel like connecting portion between the panel side cylindrical portion and the intermediate cylindrical portion.
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