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US 5,861,710 AGranted
Color cathode ray tube with reduced moire
AssigneeHitachi, Ltd.
InventorsGo Uchida, Shoji Shirai, Kenichi Watanabe
Life of this patent
Estimating the term…
Abstract
A color cathode ray tube includes a panel portion with its inner surface coated with a phosphor film; and an in-line type electron gun having a cathode, a control electrode, an accelerating electrode, a focus electrode, and an anode for projecting three electron beams toward the phosphor film. The in-line type electron gun projects the three electron beams substantially in parallel to each other in a plane perpendicular to the major axis of the screen.
Claims8
A color cathode ray tube comprising:
- a panel portion having a screen comprised of a phosphor film coated on an inner surface of the panel portion;
- and
- an in-line type electron gun including at least a cathode, a control electrode, an accelerating electrode, a focus electrode, and an anode for projecting three electron beams toward said screen;
- wherein said in-line type electron gun projects said three electron beams substantially in parallel to each other in a plane perpendicular to a major axis of said screen, and wherein said three electron beams converge on a common area on said phosphor film.
1 more element
A color cathode ray tube comprising:
- a panel portion having a screen comprised of a phosphor film coated on an inner surface of the panel portion;
- a shadow mask disposed closely spaced from said screen;
- an in-line type electron gun including at least a cathode, a control electrode, an accelerating electrode, a focus electrode, and an anode for projecting three electron beams toward said screen;
- and
- a deflection yoke disposed between said screen and said in-line type electron gun;
- wherein said in-line type electron gun projects said three electron beams substantially in parallel to each other in a plane perpendicular to a major axis of said screen, and wherein said three electron beams converge on a common area on said phosphor film.
3 more elements
A color cathode ray tube comprising:
- a panel portion having a screen comprised of a phosphor film coated on an inner surface of the panel portion;
- and
- an in-line type electron gun including at least a cathode, a control electrode, an accelerating electrode, a focus electrode, and an anode for projecting three electron beams toward said screen;
- wherein said in-line type electron gun projects said three electron beams substantially in parallel to each other in a plane perpendicular to a major axis of said screen, and wherein said in-line type electron gun further includes a main lens for converging the three electron beams on a common area of the phosphor film to trace a single scanning line at a time on said screen.
1 more element
A color cathode ray tube comprising:
- a panel portion having a screen comprised of a phosphor film coated on an inner surface of the panel portion;
- a shadow mask disposed closely spaced from said screen;
- an in-line type electron gun including at least a cathode, a control electrode, an accelerating electrode, a focus electrode, and an anode for projecting three electron beams toward said screen;
- and
- a deflection yoke disposed between said screen and said in-line type electron gun;
- wherein said in-line type electron gun projects said three electron beams substantially in parallel to each other in a plane perpendicular to a major axis of said screen, wherein said in-line type electron gun further includes a main lens for converging the three electron beams on a common area of the phosphor film, and wherein said deflection yoke operates in conjunction with the in-line type electron gun to trace a single scanning line at a time, formed from said three electron beams, on the screen;
- and
- a horizontal deflection magnetic field formed by said deflection yoke for deflecting said three electron beams in a direction of said major axis of said screen has a barrel-like distribution, and a vertical deflection magnetic field formed by said deflection yoke for deflecting said three electron beams in a direction perpendicular to said major axis of said screen has a pin cushion-like distribution.
5 more elements
Dependencies are inferred from the claim text.