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US 4,885,503 AGranted
Color cathode-ray tube
AssigneeHitachi, Ltd.
InventorsEiki Takahashi, Masahiro Miyazaki, Kiyoshi Nakamura
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AssigneeHitachi, Ltd.
InventorsEiki Takahashi, Masahiro Miyazaki, Kiyoshi Nakamura
Estimating the term…
A particle shielding element of a shape memory metal is installed between an electroconductive layer on the inner peripheral surface of a neck glass tube of a cathode-ray tube and a shield cup of an electron gun therein to close a gap between the neck glass tube and the shield cup for thereby guarding the electronic gun against invasion of particles, Before the particle shielding element is inserted into the neck glass tube, the element is deformed to reduce its outer diameter so that the element can be inserted into the neck glass tube without scratching the electroconductive layer. After the element has been installed in Position in the neck glass tube, the temperature therein is adjusted to cause the element to recovery to its initial shape into dust sealing engagement with the electroconductive layer.
A cathode-ray tube comprising a neck glass tube having an inner peripheral surface coated with an electroconductive layer, an electron gun including a shield cup having an outer peripheral surface radially inwardly spaced from said electroconductive layer and cooperating therewith to define therebetween a gap, and a particle shielding element extending between said shield cup and said electroconductive layer to close said gap to thereby guard said electron gun against invasion of particles, said particle shielding element having a radially outer portion disposed in contact with said electroconductive layer, at least a part of said particle shielding element being formed from a shape memory metal, said particle shielding element having been deformed to an outer diameter smaller than an inner diameter of said electroconductive layer before said particle shielding element is installed in position in said neck glass tube, to thereby allow said particle shielding element to be inserted into said neck glass tube without scratching said electroconductive layer.
A method of preparing a particle shielding element to be inserted into a neck glass tube of a cathode-ray tube together with an electron gun so as to close a gap defined between an inner peripheral surface of said neck glass tube and a shield cup of said electron gun so that the latter is guarded against invasion of particle, said method comprising the steps of:
Dependencies are inferred from the claim text.