Apparatus for high voltage treatment of cathode ray tube

An apparatus for implementing high voltage treatment for a cathode ray tube, comprising:

• a container including an interior and one open end to permit high pressure gas to be supplied to the interior, the container being connected to a socket with a base, the socket including pressure-contact terminals on the base;
• a seal member of an elastic material fitted to the open end of the container;
• an advancing/retreating device for supporting said container, for moving the container along an axis of the cathode ray tube in a first direction until the seal member is pressed against a funnel portion of the cathode ray tube thereby forming an airtight seal between the open end of the container and the funnel portion of the cathode ray tube, wherein the pressure-contact terminals of the socket are brought into contact with pressure-contact terminals connected in advance to stem pins of a neck portion of the cathode ray tube, and for moving the container in a second direction until the seal member is separated from the funnel portion of the cathode ray tube, wherein the pressure-contact terminals of the socket are separated from the pressure-contact terminals connected to the stem pins;
• means for introducing a high pressure gas into the container after the air tight seal has been formed;
• and
• means for applying a voltage, via the contacted pressure-contact terminals, to the stem pins after the neck of the cathode ray tube has been surrounded by the introduced high pressure gas.

An apparatus for implementing high voltage treatment for a cathode ray tube, including a neck having one end closed with a stem, and housing an electron gun including at least first and second electrodes, and first and second stem pins, external to the cathode ray tube neck and housing, for the first and second electrodes, the apparatus comprising:

• first means for establishing a high pressure gas atmosphere around the neck;
• second means for applying a voltage which is sufficiently higher than an operating voltage of the cathode ray tube between the first and second stem pins after establishing the high pressure gas atmosphere;
• and
• a heating source external to the cathode ray tube neck and housing, for externally heating the part of the stem containing the first and second stem pins, above a temperature of the high pressure gas atmosphere, to thereby prevent a creeping discharge external to the cathode ray tube neck and housing due to the voltage applied to the first and second stem pins.

A high voltage treatment apparatus for a cathode ray tube including a neck having one end closed with a stem, and housing an electron gun including at least first and second electrodes and first and second stem pins for the first and second electrodes, the apparatus comprising:

• first means for establishing a high pressure gas atmosphere around the neck;
• second means for applying a voltage, which is sufficiently higher than an operating voltage of the cathode ray tube, between the first and second stem pins after establishing the high pressure gas atmosphere;
• and
• third means for setting the dew point of the high pressure gas atmosphere at a temperature of, at most, 25.degree. C., to thereby prevent a creeping discharge from the voltage applied to the first and second stem pins, wherein said third means for setting the dew point includes means for heating the high pressure gas before it is supplied to surrounding of the neck.

A high voltage treatment apparatus for a cathode ray tube including a neck having one end closed with a stem, and housing an electron gun including first and second electrodes, and first and second stem pins for the first and second electrodes, the apparatus comprising:

• a container which has one end open, which is provided with a socket on its base, and which is provided with a seal assembly including a hollow annular seal member of elastic material disposed on an inner peripheral surface of the container at the open end;
• first means for advancing the container toward the cathode ray tube such that the container encloses the neck and the socket and the container is connected with the first and second stem pins of the neck;
• second means for supplying compressed air into the hollow annular seal member so as to reduce its inner diameter such that it is pressed against an outer peripheral surface of the neck so as to form an airtight seal between the outer peripheral surface of the neck and the open end of the container;
• third means for introducing a high pressure gas into the container while said airtight seal is maintained between the outer peripheral surface of the neck and the open end of the container;
• and
• fourth means for applying a voltage which is sufficiently higher than an operating voltage of the cathode ray tube, between the first and second stem pins, via the socket to the stem pins, while the neck is surrounded by the high pressure gas.

A high voltage treatment apparatus for a cathode ray tube, including a neck having one end closed with a stem, and housing an electron gun including first and second electrodes, and first and second stem pins for the first and second electrodes, the apparatus comprising:

• a first socket having pressure-contact terminals, connected to the first and second stem pins on the neck of the cathode ray tube;
• first means for advancing a container, which has one open end and is provided with a second socket having pressure contact terminals on its base and a seal member of elastic material fitted to the open end, toward the cathode ray tube such that the seal member is pressed against a funnel of the cathode ray tube to form an airtight seal between the open end of the container and the funnel, and the pressure-contact terminals of the first and second sockets are contacted with each other to establish electrical connection;
• second means for introducing a high pressure gas into the container while the air tight seal is maintained to establish a high pressure gas atmosphere around the neck;
• and
• third means for applying a voltage, which is sufficiently higher than an operating voltage of the cathode ray tube, between the first and second stem pins for the first and said second electrodes, via the pressure-contact terminals to the first and second stem pins while the neck is surrounded by the high pressure gas.