Projection tube apparatus
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United States of America Patent
Stats
-
Jun 5, 2007
Grant Date -
Sep 1, 2005
app pub date -
Feb 8, 2005
filing date -
Feb 27, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection tube apparatus includes: a valve made up of a face panel having a screen face on its external face, a funnel connected to a rear portion of the face panel, and a neck portion; an electron gun that emits an electron beam and is housed in the neck portion; and a deflection device mounted at an outer circumference of the funnel on the neck portion side. The deflection device at least includes: horizontal deflection coils that generate a horizontal deflection field for deflecting the electron beam in the horizontal direction; vertical deflection coils that generate a vertical deflection field for deflecting the electron beam in the vertical direction and is disposed outside the horizontal deflection coils; and a ferrite core disposed outside the vertical deflection coils. A distance Ls between an end portion of the horizontal deflection coils on the screen face side and the screen face is set to 55 mm.ltoreq.Ls.ltoreq.80 mm.
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