Abstract: Method for evaporating a getter material in a vacuum tube, comprising a step of providing a high frequency induction coil on the outside of the vacuum tube, near the location of the holder of the getter material, and passing an alternating current through the high-frequency induction coil for evaporating the getter material. The alternating current is generated by a high-frequency generator with a variable frequency. The induction coil and a capacitor are jointly incorporated in a resonant circuit. During execution of the evaporating step, the frequency of the high-frequency generator is attuned to the resonant frequency of the LC resonator. The dissipated power in the getter material in the holder is then determined from the power delivered by the high-frequency generator and the dissipated power in the LC resonator. The dissipated power can be controlled by adjusting the total power of the high-frequency generator.

Abstract: A method and an apparatus for manufacture of a cathode-ray tube where an electron gun for emitting a plurality of electron beams is enclosed in a tube body with discrete electrodes disposed individually to such beams and joint electrodes disposed commonly to the beams. The method comprises the steps of incorporating the electron gun in the tube body and applying high-frequency induction heat principally to the joint electrodes to thereby evacuate and seal up the tube body; flashing a getter material; and disposing at least a pair of cored coils on both sides of the tube body at positions opposite to the discrete electrodes disposed individually to the plurality of beams, and applying high-frequency induction heat principally to the discrete electrodes.

Abstract: A method of manufacturing a vaporized metal discharge lamp wherein a metal halide is attached to the tip of a metal rod, such as through vapor deposition or sputtering. The rod is then inserted into a light emission envelope of the lamp, and the metal halide attached to the metal rod tip is transferred to the inside of the envelope through high frequency induction heating.

Abstract: In a getter arrangement for providing a getter spot on the walll of an evacuated space, for example an electron tube, the power transfer can be of too short or too long a duration (for example because of positional inaccuracies of the holder containing the getter material or inaccuracies in the shape or composition of the wall). In the first case the intended quality of the getter process is not obtained, in the second case the electron tube may get damaged. A control unit measures the duration of the time interval which starts at the beginning of the power transfer and ends at the instant the getter spot is created. This instant is determined by a detector which detects the getter spot. After this instant the control unit continues the power transfer during a further time interval whose length depends on the first time interval. Consequently, the duration of the transfer depends on the behaviour of the gettering process, which improves the quality of the gettering process and prevents damage to the tube.

Abstract: A getter flasher has a movable, self-centering coil enclosure including an rf induction coil adapted to heat a getter container disposed within a cathode-ray tube and adjacent to a funnellike surface thereof. The coil enclosure is supported by a holder and has a spring coupled thereto for moving the coil enclosure in a direction away from the holder. A surface of the coil enclosure has a contour substantially similar to a portion of the funnellike surface of the tube.

Abstract: An induction coil and a process for evenly heating an asymmetric getter device. The induction coil has a major coil and a smaller minor coil. A portion of the major coil is substantially coincidental with a portion of the minor coil. A different portion of the major coil is offset with respect to the minor coil.

Abstract: A gettering device installed in a picture display tube includes an annular, channel-shaped metal holder containing an evaporable gettering metal and a heat-activated gas releasing material. The gas releasing material is disposed in the holder against a surface which rapidly increases in temperature in response to inductive heating of the holder. This material is covered by the gettering metal to protect it against deterioration by exposure to moist, high temperature air during tube manufacturing processes occurring after installation of the device. During inductive heating, the temperature of the gas releasing material increases faster than that of the gettering metal and begins releasing gas before the gettering metal begins to evaporate.

Abstract: A mercury-releasing assembly for dosing lamps, tubes, and the like with a charge of mercury, contains a mixture of an intermetallic compound of mercury and a metal. When the mixture is heated to a particular temperature the mixture reacts yielding a molten eutectic and mercury vapor. The mixture may be protected from contamination by a foil shield which ruptures under pressure of the released mercury.

Abstract: A method is proposed for eliminating so-called halo blocked apertures in color picture cathode-ray tubes. The cathode-ray tube comprises an evacuated envelope having therein a luminescent viewing screen, an electron gun for producing at least one electron beam for exciting the screen to luminescence and an apertured mask closely spaced from the screen for selectively intercepting and transmitting portions of the electron beam. A getter is provided for coating an interior surface of the apertured mask with a gas-sorbing, conductive getter material film. The halo blocked apertures are caused by insulative negatively-charged particles attached to the interior surface of the apertured mask. The conventional tube processing includes the steps of getter flashing, cathode discharge ball gap, cathode conversion, hot shot, first low voltage age, implosion proofing, external coating, frit breakdown check, radio frequency spot knock and final low voltage age.