Electrode structure for an electron gun for a cathode ray tube
First Claim
1. An electron gun for a color cathode ray tube comprising:
- an electron beam generating part including a cathode, a control electrode, and a screen electrode for generating an electron beam having first, second and third components; and
a main lens including a focus electrode and an acceleration electrode for accelerating and focusing the electron beam, wherein a recess, through which the first, second and third components commonly pass, is provided by forming a rim at each of the edges of an electron beam outgoing side plane of the focus electrode and an incoming side plane of the acceleration electrode, and three independent small-aperture electron beam passing holes are formed on the bottom of the recess in the focus electrode and when the vertical and horizontal diameters of the central electron beam passing hole of said three small-aperture electron beam passing holes of said focus electrode are DV and DH, respectively, and the vertical and horizontal diameters of the flanking electron beam passing holes are DV'"'"' and DH'"'"', respectively, the following expression is satisfied;
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Accused Products
Abstract
An electron gun for a cathode ray tube includes common large-aperture electron beam passing holes which are formed by recessing the portion except the rims on the outgoing side plane of a focus electrode and the incoming side plane of a final accelerating electrode, for expanding an electric field. Three independent small-aperture electron beam passing holes are formed at the recessed position by a predetermined depth from the rims. The ratio of the horizontal diameter to the vertical diameter of the central electron beam passing hole among the three independent small-aperture electron beam passing holes of the focus electrode is smaller than those of the outer independent small-aperture electron beam passing holes. Accordingly, the influence of the spherical aberration to the electron beam which passes through the main lens is reduced, so that the quality of the picture reproduced on the screen is improved.
13 Citations
1 Claim
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1. An electron gun for a color cathode ray tube comprising:
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an electron beam generating part including a cathode, a control electrode, and a screen electrode for generating an electron beam having first, second and third components; and a main lens including a focus electrode and an acceleration electrode for accelerating and focusing the electron beam, wherein a recess, through which the first, second and third components commonly pass, is provided by forming a rim at each of the edges of an electron beam outgoing side plane of the focus electrode and an incoming side plane of the acceleration electrode, and three independent small-aperture electron beam passing holes are formed on the bottom of the recess in the focus electrode and when the vertical and horizontal diameters of the central electron beam passing hole of said three small-aperture electron beam passing holes of said focus electrode are DV and DH, respectively, and the vertical and horizontal diameters of the flanking electron beam passing holes are DV'"'"' and DH'"'"', respectively, the following expression is satisfied;
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Specification
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- Resources
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Current AssigneeSamsung Electronics Co. Ltd.
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Original AssigneeSamsung Electronics Co. Ltd.
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InventorsKweon, Yong-geol
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Primary Examiner(s)Yusko, Donald J.
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Assistant Examiner(s)PATEL, NIMESHKUMAR D
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Application NumberUS07/809,434Time in Patent Office839 DaysField of Search313/414, 313/409, 313/412, 313/413, 313/439US Class Current313/414CPC Class CodesH01J 29/503 Three or more guns, the axe...
