Electron gun for a color cathode ray tube
First Claim
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1. An electron gun for a color cathode ray tube comprising:
- a cathode;
a control electrode adjacent to and spaced from said cathode;
a screen electrode adjacent to and spaced from said control electrode, said cathode, said screen electrode and said control electrode together constituting a triode which generates an electron beam;
first, second, third and fourth electrodes arranged sequentially;
an accelerating electrode adjacent to and spaced from said fourth electrode;
a first bipotential dynamic quadruple pre-focus lens positioned between said first and third electrodes;
a second dynamic quadruple pre-focus lens positioned between said third and fourth electrodes;
a main lens positioned between said fourth electrode and said accelerating electrode;
means for varying the intensity of said first bipotential dynamic quadruple pre-focus lens;
means for varying the intensity of said second dynamic quadruple pre-focus lens; and
means for varying the intensity of said main lens.
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Abstract
An electron gun for a color cathode ray tube includes a cathode, a control electrode and a screen electrode constituting a prepositioned triode. First, second, third and fourth focus electrodes form two pre-focus lenses and a final accelerating electrode positioned adjacent to the fourth focus electrode forms a main focus lens. The first pre-focus lens is synchronous with a deflection signal. Variation of the focussing intensity of the main focus lens is compensated for by the first pre-focus lens.
7 Citations
19 Claims
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1. An electron gun for a color cathode ray tube comprising:
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a cathode; a control electrode adjacent to and spaced from said cathode; a screen electrode adjacent to and spaced from said control electrode, said cathode, said screen electrode and said control electrode together constituting a triode which generates an electron beam; first, second, third and fourth electrodes arranged sequentially; an accelerating electrode adjacent to and spaced from said fourth electrode; a first bipotential dynamic quadruple pre-focus lens positioned between said first and third electrodes; a second dynamic quadruple pre-focus lens positioned between said third and fourth electrodes; a main lens positioned between said fourth electrode and said accelerating electrode; means for varying the intensity of said first bipotential dynamic quadruple pre-focus lens; means for varying the intensity of said second dynamic quadruple pre-focus lens; and means for varying the intensity of said main lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 18, 19)
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8. An electron gun for a color cathode ray tube comprising:
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a cathode; a control electrode adjacent to and spaced from said cathode; a screen electrode adjacent to and spaced from said control electrode, said cathode, said screen electrode and said control electrode together constituting a triode which generates an electron beam; first, second, third and fourth electrodes arranged sequentially; an accelerating electrode adjacent to and spaced from said fourth electrode and electrically connected to said second electrode; means for supplying a screen voltage to said screen electrode; means for supplying a static focus voltage to said third electrode, the static focus voltage having a higher potential than the screen voltage; means for supplying a static anode voltage to said second electrode and said accelerating electrode; and means for supplying a dynamic focus voltage to said first and fourth electrodes, the dynamic focus voltage having a minimum potential equal to the potential of the static focus voltage. - View Dependent Claims (9, 10, 11, 12)
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13. An electron gun for a color cathode ray tube comprising:
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a cathode; a control electrode adjacent to and spaced from said cathode; a screen electrode adjacent to and spaced from said control electrode, said cathode, said screen electrode and said control electrode together constituting a triode which generates an electron beam; first, second, third and fourth electrodes arranged sequentially, said second electrode being electrically connected to said screen electrode and said first electrode being electrically connected to said fourth electrode; an accelerating electrode adjacent to and spaced from said fourth electrode; means for supplying a screen voltage to said screen electrode and said second electrode; means for supplying a static focus voltage to said third electrode, the static focus voltage having a higher potential than the screen voltage; means for supplying a static anode voltage to said accelerating electrode; and means for supplying a dynamic focus voltage to said first and fourth electrodes, the dynamic focus voltage having a minimum potential equal to the potential of the static focus voltage. - View Dependent Claims (14, 15, 16, 17)
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Specification