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US 7,009,333 B2Granted
Structure of electron gun for color cathode ray tube
AssigneeLG.Philips Display Korea Co., Ltd.
InventorsCheol Ho Hwang, Moon Sik Kim, Ki Tae Kim, Dong Young Kim
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Abstract
A cathode ray tube with a reduced beam spot size on a fluorescent screen is obtained by forming electron beam passing holes on the electrodes composing a triode portion of an electron gun to have horizontally and vertically asymmetric shapes.
Claims22
A cathode ray tube mounted with an electron gun comprising:
- a triode portion consisting of a cathode;
- first and second electrodes for controlling and accelerating electron beams emitted from the cathode;
- and
- a plurality of focus electrodes for focusing the electron beams;
- wherein a ratio of a vertical size to a horizontal size of an electron beam passing hole on the first electrode ranges from 1.9 to 3.0.
2 more elements
A cathode ray tube with an electron gun comprising:
- a triode portion having a cathode;
- a first electrode for controlling and accelerating electron beams emitted from the cathode with an electron beam passing hole that has a first horizontal and vertical size on a first side near the cathode and a second horizontal and vertical size on a second side opposite the first side;
- a second electrode for controlling and accelerating electron beams emitted from the cathode with an electron beam passing hole that has a third horizontal and vertical size;
- and
- a plurality of focus electrodes for focusing the electron beams;
- wherein a ratio of the second vertical size to the second horizontal size of the second side opposite the first side of the first electrode is greater than a ratio of the first vertical size to the first horizontal size of the first side of the first electrode;
- and
- wherein a ratio of the vertical size to the first horizontal size is greater than 1.5, a ratio of the second vertical size to the second horizontal size is greater than 1.5, and a ratio of the third vertical size to the third horizontal size is greater than 1.5.
5 more elements
Dependencies are inferred from the claim text.