Magnetism shield for cathode ray tube
AssigneeLG Electronics Inc.
InventorEun Woo Lee
Life of this patent
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Abstract
A magnetism shield for a color cathode ray tube is disclosed including: a shadow mask through which an electron beam passes; a mask frame to which the shadow mask is fixed; an inner shield fixed to the mask frame and for preventing the path of the electron beam from being distorted due to magnetism; a panel; a phosphorous surface formed on the inner surface of the panel; and means for shielding an area placed between the shadow mask and phosphorous surface.
Claims16
A cathode ray tube comprising:
- a shadow mask in which an electron beam passes therethrough;
- a mask frame to which said shadow mask is fixed;
- a panel having a phosphorous surface;
- and
- a magnetic shield constructed and arranged to shield an area between said shadow mask and said panel from a magnetic field, said magnetic shield comprising a black matrix film formed on an inner side of said panel, said black matrix being made from a soft magnetic metallic material.
A cathode ray tube comprising:
- a shadow mask in which an electron beam passes therethrough;
- a mask frame to which said shadow mask is fixed;
- a panel having a phosphorous surface;
- and
- a magnetic shield constructed and arranged to shield an area between said shadow mask and said panel from a magnetic field, wherein said magnetic shield is a magnetic shielding layer made from a soft magnetic substance having high permeability and formed on an outer surface of said panel.
A method of illuminating a phosphorous screen of a cathode ray tube, the method comprising the steps of:
- generating an electron beam;
- passing the electron beam through a shadow mask;
- shielding the electron beam in an area between the shadow mask and the phosphorous screen from a magnetic field with a black matrix film made from a high permeability soft magnetic metallic material, provided on an inner side of the phosphorous screen;
- and
- selectively illuminating the phosphorous screen with the electron beam.
A method of illuminating a phosphorous screen of a cathode ray tube, the method comprising the steps of:
- generating an electron beam;
- passing the electron beam through a shadow mask;
- shielding the electron beam in an area between the shadow mask and the phosphorous screen from a magnetic field;
- and
- selectively illuminating the phosphorous screen with the electron beam, wherein said shielding step comprises shielding the electron beam with a shielding layer formed on an outer surface of the phosphorous screen.
Dependencies are inferred from the claim text.