Projection tube apparatus

Details Projection tube apparatus Projection tube apparatus

2007-06-05

2007-06-05

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

C313S426000, C313S440000

Reexamination Certificate

active

11055237

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≦Ls≦80 mm.

REFERENCES:
patent: 6307314 (2001-10-01), Sano
patent: 6750602 (2004-06-01), Hirota et al.
patent: 7015634 (2006-03-01), Watanabe et al.
patent: 2003-123669 (2003-04-01), None

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