Cathode ray tube including an electron gun having specific relation between axial length of focus electrode and lens-screen distance
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United States of America Patent
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Jan 14, 2003
Grant Date -
Dec 12, 2002
app pub date -
Jan 26, 2001
filing date -
Jan 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cathode ray tube has an anode of a large-diameter cylinder portion on its phosphor screen side and a small-diameter cylinder portion on its cathode side connected together, and a focus electrode formed of a large-diameter cylinder portion of a diameter larger than that of the small-diameter cylinder portion of the anode and a small-diameter cylinder portion having a diameter smaller than that of the small-diameter cylinder portion of the anode, the large-diameter and small-diameter cylinder portions being connected together. The large-diameter cylinder portion of the focus electrode is disposed concentrically within the 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, LP.gtoreq.131.7, 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 the phosphor screen.
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