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US 6,583,812 B1Granted
Method and apparatus for inspecting phosphor screen of cathode ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsTatsuya Yamazaki, Toshiyuki Imaizumi, Katsumi Omote, Kazumasa Hirayama
Life of this patent
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Abstract
A cathode ray tube phosphor screen inspecting method includes the steps of illuminating a panel of a cathode ray tube, in which a phosphor screen having a regular pattern is formed the inner surface of a face, from the inner surface of the face, imaging the face inner surface, and specifying a defect on the phosphor screen from data obtained by the imaging. The panel, an illuminating unit for illumination, and an image unit for performing the imaging are moved relative to each other. The amount of light from the illuminating unit is changed in accordance with this relative movement.
Claims19
A cathode ray tube phosphor screen inspecting method comprising:
- illuminating a panel of a cathode ray tube with light, in which a phosphor screen having a regular pattern is formed on an inner surface of a face of the panel, from the inner surface side of said face;
- imaging a light image reflected from the inner surface of said face;
- and
- specifying a defect on said phosphor screen from data obtained by said imaging;
- wherein said panel, and illuminating means for illumination and imaging means for imaging are moved relative to each other, and an amount of light from said illuminating means is changed in accordance with the relative movement such that the amount of illumination at an imaging position on said panel remains unchanged;
- and
- wherein a plurality of illuminating means are juxtaposed in a direction of movement relative to said panel, and an amount of light from each illuminating means is changed such that a total amount of light irradiated from said plurality of illuminating means onto the face inner surface remains unchanged.
4 more elements
A cathode ray tube phosphor screen inspecting method comprising:
- illuminating a panel of a cathode ray tube, in which a phosphor screen having a regular pattern is formed on an inner surface of a face, from the inner surface or an outer surface of said face;
- imaging light components transmitted through the same position on said phosphor screen of said panel in a plurality of directions at the same time;
- moving an imaging position relative to said phosphor screen of said panel;
- keeping the amount of illumination at said imaging position on said panel unchanged;
- and
- specifying a potential defective portion detected by the simultaneous imaging in a plurality of directions as a defect on said phosphor screen;
- wherein the illumination is performed in a plurality of directions opposite to the imaging directions.
4 more elements
A cathode ray tube phosphor screen inspecting apparatus comprising:
- an illuminating mechanism illuminating a panel of a cathode ray tube with light, in which a phosphor screen having a regular pattern is formed on an inner surface of a face of the panel, from the inner surface side of said face;
- an arrangement imaging a light image reflected from the inner surface of said face;
- a defect detecting mechanism specifying a defect on said phosphor screen from imaging data obtained by said imaging mechanism;
- and
- moving means for moving said panel, and illuminating means and imaging means relative to each other;
- and illumination control means for changing a light amount of said illuminating means in accordance with the relative movement such that the amount of illumination at an imaging position on said panel remains unchanged;
- wherein a plurality of illuminating means are juxtaposed in a direction of movement relative to said panel, and an amount of light from each illuminating means is changed such that a total amount of light irradiated from said plurality of illuminating means onto the face inner surface remains unchanged.
4 more elements
A cathode ray tube phosphor screen inspecting apparatus comprising:
- illuminating means for illuminating a panel of a cathode ray tube, in which a phosphor screen having a regular pattern is formed on an inner surface of a face, from the inner surface or an outer surface of said face;
- a plurality of imaging means for imaging light components transmitted through the same position on said phosphor screen of said panel in a plurality of directions at the same time;
- moving means for moving an imaging position relative to said phosphor screen of said panel;
- illumination control means for controlling the amount of light which is illuminated from said illumination means such that the amount of illumination at said imaging position on said panel is unchanged;
- and
- defect detecting means for specifying a potential defective portion detected by the simultaneous imaging in a plurality of directions as a defect on said phosphor screen;
- wherein a plurality of illuminating means are arranged in opposite directions to the imaging directions.
4 more elements
A cathode ray tube phosphor screen inspecting method comprising:
- illuminating a panel of a cathode ray tube with light, in which a phosphor screen having a regular pattern is formed on an inner surface of a face of the panel, from the inner surface side of said face;
- imaging a light image reflected from the inner surface of said face;
- and
- specifying a defect on said phosphor screen from data obtained by said imaging;
- wherein a plurality of imaging means are juxtaposed in a direction of movement relative to said panel, and imaging operations of said imaging means are switched in accordance with the movement relative to said panel;
- and
- wherein an amount of light from said illuminating means is changed in accordance with the relative movement such that the amount of illumination at an imaging position on said panel remains unchanged.
4 more elements
A cathode ray tube phosphor screen inspecting method comprising:
- illuminating a panel of a cathode ray tube, in which a phosphor screen having a regular pattern is formed on an inner surface of a face, from the inner surface or an outer surface of said face;
- imaging light components transmitted through the same position on said phosphor screen of said panel in a plurality of directions at the same time;
- moving an imaging position relative to said phosphor screen of said panel;
- keeping the amount of illumination at said imaging position on said panel unchanged;
- and
- specifying a potential defective portion detected by the simultaneous imaging in a plurality of directions as a defect on said phosphor screen;
- wherein the imaging directions are two directions along a direction in which the imaging position is moved relative to said phosphor screen of said panel, and symmetrically inclined 5 to 15° to an axis perpendicular to said phosphor screen of said panel.
4 more elements
A cathode ray tube phosphor screen inspecting apparatus comprising:
- illuminating means for illuminating a panel of a cathode ray tube, in which a phosphor screen having a regular pattern is formed on an inner surface of a face, from the inner surface or an outer surface of said face;
- a plurality of imaging means for imaging light components transmitted through the same position on said phosphor screen of said panel in a plurality of directions at the same time;
- moving means for moving an imaging position relative to said phosphor screen of said panel;
- illumination control means for controlling the amount of light which is illuminated from said illumination means such that the amount of illumination at said imaging position on said panel is unchanged;
- and
- defect detecting means for specifying a potential defective portion detected by the simultaneous imaging in a plurality of directions as a defect on said phosphor screen;
- wherein a pair of imaging means are juxtaposed along a direction in which the imaging position is moved relative to said phosphor screen of said panel by said moving means, and symmetrically inclined 5 to 15° to an axis perpendicular to said phosphor screen of said panel.
4 more elements
A cathode ray tube phosphor screen inspecting apparatus comprising:
- an illuminating mechanism illuminating a panel of a cathode ray tube with light, in which a phosphor screen having a regular pattern is formed on an inner surface of a face of the panel, from the inner surface side of said face;
- an arrangement imaging a light image reflected from the inner surface of said face;
- and
- a defect detecting mechanism specifying a defect on said phosphor screen from imaging data obtained by said imaging mechanism;
- wherein a plurality of imaging means are juxtaposed in a direction of movement relative to said panel;
- and
- moving means for moving said panel, and illuminating means and imaging means relative to each other;
- and imaging control means for switching imaging operations of said imaging means in accordance with the relative movement and an amount of light from said illuminating means is changed in accordance with the relative movement such that the amount of illumination at an imaging position on said panel remains unchanged.
5 more elements
Dependencies are inferred from the claim text.