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US 6,211,611 B1Granted
Color cathode-ray tube with resistive spring contact
AssigneeMatsushita Electronics Corporation
InventorsYuji Taguchi, Hideharu Ohmae
Life of this patent
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AssigneeMatsushita Electronics Corporation
InventorsYuji Taguchi, Hideharu Ohmae
Estimating the term…
A cathode-ray tube comprises a bulb formed by connecting a panel having a phosphor provided on the inner surface and a funnel having a conductive coating film provided on the inner wall, an electron gun housed in the neck portion of the funnel, and springs that are provided for a final electrode of the electron gun. The springs have contact portions to electrically contact the coating film on the funnel inner wall and the final electrode, in which the specific resistance value of the contact portions of the springs is determined to be greater than that of the graphite coating film contacting with the contact portions. As only one kind of conductive coating film need be applied, the production process can be simplified compared to the case for using plural kinds of coating films, and problems in connecting the junctions of the coating films can be also resolved. Furthermore, the maximum instantaneous current generated at a discharge inside the bulb can be reduced, and thus, malfunction or breakage of the circuit parts of a TV set can be prevented.
A cathode-ray tube comprising a bulb having a panel with a phosphor provided on the inner surface and having a funnel with a conductive film provided on the inner wall, an electron gun housed in the neck portion of the funnel, and a spring provided for a final electrode in the electron gun and electrically connecting the conductive film on the funnel inner wall with the final electrode;
A cathode-ray tube comprising a bulb having a panel with a phosphor provided on the inner surface and having a funnel with a conductive film provided on the inner wall, an electron gun housed in the neck portion of the funnel, and a spring provided for a final electrode in the electron gun and having a contact portion to electrically connect the conductive film on the funnel inner wall with the final electrode;
A cathode-ray tube comprising a bulb having a panel with a phosphor provided on the inner surface and having a funnel with a conductive film provided on the inner wall, an electron gun housed in the neck portion of the funnel, and a spring provided for a final electrode in the electron gun and having a contact portion to electrically connect the conductive film on the funnel inner wall with the final electrode;
Dependencies are inferred from the claim text.