Color cathode ray tube having an improved electron gun
First Claim
1. A color cathode ray tube comprisingan evacuated envelope comprising a panel portion, a neck portion and a funnel portion for connecting said panel portion and said neck portion,a three-color phosphor screen formed on an inner surface of said panel portion,a shadow mask having a multiplicity of apertures therein and spaced from said phosphor screen,a three-beam in-line type electron gun housed in said neck portion,said three-beam in-line type electron gun including an electron beam generating section for generating three controlled electron beams and a main lens section for focusing said three electron beams on said three-color phosphor screen anda deflecting device mounted in a vicinity of a transition region between said funnel portion and said neck portion for scanning said three electron beams on said three-color phosphor screen,wherein said main lens section comprises a focus electrode and an anode facing said focus electrode,each of said focus electrode and said anode comprises an electrode having a single opening common for said three electron beams in an end thereof facing each other and a plate electrode disposed therein and for forming three beam apertures for passing said three electron beams respectively, and satisfies a following inequality:
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space="preserve" listing-type="equation">(A+566)/106>
H-2×
Swhere A is V1×
V2×
T,V1 is a vertical diameter of said single opening,V2 is a vertical diameter of a center one of said three beam apertures andT is an axial distance between said single opening and said plate electrode,H is a horizontal diameter of said single opening,S is P×
L/Q,P is a horizontal center-to-center spacing between adjacent phosphor elements at a center of said three-color phosphor screen,Q is an axial spacing between said three-color phosphor screen and said shadow mask at the center of said three-color phosphor screen, andL is an axial distance between said shadow mask and said single opening in said focus electrode.
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Accused Products
Abstract
A color cathode ray tube includes a three-beam in-line type electron gun. The main lens section includes a focus electrode and an anode facing the focus electrode, each of the focus electrode and the anode has an electrode having a single opening common for three electron beams in an end thereof facing each other and a plate electrode disposed therein and having beam apertures. The focus electrode and the anode satisfy a following inequality:
(A+566)/106>H-2×S
where A is V1×V2×T, V1 is a vertical diameter of the single opening, V2 is a vertical diameter of a center one of the beam apertures and T is an axial distance between the single opening and the plate electrode, H is a horizontal diameter of the single opening, S is P×L/Q, P is a horizontal center-to-center spacing between adjacent phosphor elements at a center of the three-color phosphor screen, Q is an axial spacing between the three-color phosphor screen and the shadow mask at the center of the three-color phosphor screen, and L is an axial distance between the shadow mask and the single opening in the focus electrode.
6 Citations
3 Claims
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1. A color cathode ray tube comprising
an evacuated envelope comprising a panel portion, a neck portion and a funnel portion for connecting said panel portion and said neck portion, a three-color phosphor screen formed on an inner surface of said panel portion, a shadow mask having a multiplicity of apertures therein and spaced from said phosphor screen, a three-beam in-line type electron gun housed in said neck portion, said three-beam in-line type electron gun including an electron beam generating section for generating three controlled electron beams and a main lens section for focusing said three electron beams on said three-color phosphor screen and a deflecting device mounted in a vicinity of a transition region between said funnel portion and said neck portion for scanning said three electron beams on said three-color phosphor screen, wherein said main lens section comprises a focus electrode and an anode facing said focus electrode, each of said focus electrode and said anode comprises an electrode having a single opening common for said three electron beams in an end thereof facing each other and a plate electrode disposed therein and for forming three beam apertures for passing said three electron beams respectively, and satisfies a following inequality: -
space="preserve" listing-type="equation">(A+566)/106>
H-2×
Swhere A is V1×
V2×
T,V1 is a vertical diameter of said single opening, V2 is a vertical diameter of a center one of said three beam apertures and T is an axial distance between said single opening and said plate electrode, H is a horizontal diameter of said single opening, S is P×
L/Q,P is a horizontal center-to-center spacing between adjacent phosphor elements at a center of said three-color phosphor screen, Q is an axial spacing between said three-color phosphor screen and said shadow mask at the center of said three-color phosphor screen, and L is an axial distance between said shadow mask and said single opening in said focus electrode. - View Dependent Claims (2, 3)
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Specification