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US 4,057,747 AGranted
In-line plural beam color cathode ray tube having deflection defocus correcting elements
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorEizaburo Hamano
Life of this patent
Estimating the term…
Abstract
In a color cathode ray tube including an electron gun means for projecting three electron beams in an in-line arrangement, there is provided deflection defocus correcting means which are disposed adjacent the side electron beams for neutralizing the deflection defocus of the side beam caused by the non-uniformity of the deflection fields.
Claims13
A color cathode ray tube comprising:
- an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section;
- a phosphor screen formed on the inner surface of the face plate;
- a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen;
- electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through horizontal and vertical deflection fields produced by a deflection yoke;
- and
- deflection defocus correcting means comprising a pair of similarly shaped elements having high magnetic permeability and symmetrically located above and below the plane of the beam arrangement and disposed adjacent to the side beams and biassed substantially inwardly from the center of the beam bundle of said side beams so as to couple the deflection fields and to introduce asymmetrical forces to said side beams for correcting the beam distortion caused by the non-uniformity of said deflection fields.
3 more elements
A color cathode ray tube comprising:
- a phosphor screen;
- a shadow mask having a multiplicity of apertures disposed adjacent to the phosphor screen;
- electron gun means for projecting a plurality of electron beams in an in-line arrangement toward the screen through deflection fields produced by a deflection yoke;
- raster control means comprising at least a pair of control members disposed adjacent the path of the electron beams and in the region of the deflection field between the electron gun means and the deflection yoke;
- deflection defocus correcting means comprising a pair of elements of high magnetic permeability symmetrically located above and below the plane of the beam arrangement and disposed adjacent the path of the side beams in an in-line arrangement to impart assymetrical forces to said side beams to neutralize the beam distortion caused by the non-uniformity of the deflection fields.
2 more elements
A color cathode ray tube comprising:
- an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section;
- a phosphor screen formed on the inner surface of the face plate;
- a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen;
- electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through a pin-cushion shaped horizontal deflection field produced by a deflection yoke;
- and
- high magnetic permeability deflection defocus correcting means disposed adjacent the paths of the side beams to impart asymmetrical forces to the side beams to compensate for the beam distortion caused by the non-uniformity of the pin-cushion shaped deflection field.
3 more elements
Dependencies are inferred from the claim text.