Back to results
US 5,637,956 AGranted
Color cathode ray tube with reduced halo
AssigneeHitachi, Ltd.
InventorsMitsuhiro Sugiyama, Satoru Endo, Mamoru Ikeda, Masayoshi Misono
Life of this patent
Estimating the term…
Abstract
An electron beam aperture of a second grid electrode of a color cathode ray tube is a rectangular hole formed in the center of a slit-like recess having longer sides extending in the horizontal direction. The vertical width of the rectangular hole is greater than the width of each shorter side of the slit-like recess.
Claims13
An electron gun comprising in the order named:
- a triode part including a cathode, a first grid electrode, and a second grid electrode;
- a pre-focusing part including said second grid electrode and a third grid electrode;
- and
- a main lens part including at least said third grid electrode;
- wherein an electron beam aperture of at least one grid electrode selected from said first grid electrode and said second grid electrode is a rectangular hole formed in the center of a slit-like recess having longer sides extending in one direction, the width of said rectangular hole in a direction perpendicular to said one direction being greater than the width of said slit-like recess in said direction perpendicular to said one direction.
2 more elements
A color cathode ray tube comprising:
- a vacuum envelope including
- a panel portion having phosphors formed on an internal face of said panel portion,
- a neck portion, and
- a funnel portion connecting said panel portion and said neck portion;
- a shadow mask suspended inside said vacuum envelope;
- and
- an electron gun disposed in said neck portion, said electron gun including in the order named:
- a triode part including a cathode, a first grid electrode, and a second grid electrode;
- a pre-focusing part including said second grid electrode and a third grid electrode;
- and
- a main lens part including at least said third grid electrode;
- wherein an electron beam aperture of at least one grid electrode selected from said first grid electrode and said second grid electrode is a rectangular hole formed in the center of a slit-like recess having longer sides extending in one direction, the width of said rectangular hole in a direction perpendicular to said one direction being greater than the width of said slit-like recess in said direction perpendicular to said one direction.
9 more elements
Dependencies are inferred from the claim text.