Cathode ray, tube including an electron gun having specific relation of axial length of focus electrode and focus electrode-screen distance
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United States of America Patent
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May 25, 2004
Grant Date -
May 15, 2003
app pub date -
Jan 9, 2003
filing date -
Jan 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cathode ray tube has an anode and a focus electrode. The large-diameter cylinder portion of the focus electrode is disposed concentrically within a large-diameter cylinder portion of the anode. The anode and a first electrode facing a cathode side end of the focus electrode are electrically connected together within the cathode ray tube. The following relationship is satisfied: -LP+184.9.gtoreq.LG4.gtoreq.0.0004 LP.sup.3 -0.1571 LP.sup.2 +21.006 LP-922.41, where LG4 (mm) is an axial length of the focus electrode, and LP (mm) is a distance from a phosphor screen side end of the focus electrode to a center of a phosphor screen.
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