Cathode ray tube with cone having non-circular cross-section
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United States of America Patent
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Jul 10, 2007
Grant Date -
Mar 30, 2006
app pub date -
May 31, 2005
filing date -
Sep 30, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When we let the aspect ratio of the fluorescent screen of a cathode ray tube be M:N and, in a coordinate system in which the origin is a point on the tube axis and the horizontal axis and vertical axis intersect at right angles, when we let LA be the horizontal radius of the outer surface of a cone component 4, SA be the vertical radius, and .theta. be the angle formed by a horizontal axis H and an axis D in the direction of the maximum diameter on the inner surface of the cone component 4, then when the position Z on the tube axis, using as its origin a reference line position that serves as a reference for a deflection angle, is within a range of -30 mm.ltoreq.Z.ltoreq.10 mm, a portion is included such that the angle .theta. and the values of M, N, LA(Z), and SA(Z) satisfy the relational formula .theta.=tan.sup.-1[(N/M).times.(LA(Z)/SA(Z))].
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