JPS6047698B2 - Getter flash method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for flushing a getter used to maintain a high vacuum inside a cathode ray tube.

Generally, in cathode ray tubes, after the air inside the tube is exhausted by a vacuum pump, the getter is flushed to create a film-like getter film, and the getter removes residual gas inside the tube and gases released during operation of the tube. It is made to absorb into the membrane and maintain a high vacuum inside the tube.

In order to flash the getter to create a getter film in the form of a film, a getter flash device as shown in FIG. 1 has been proposed.

That is, a getter flash device having a heating coil 3 into which the neck portion 2 of the cathode ray tube 1 is inserted has been proposed. In order to prevent getter material, such as barium, which evaporates by flashing the getter from adhering to each electrode of the electron gun of the cathode ray tube 1, each electrode is also heated by the heating coil 3. There is. However, since the cathode is located far from the getter, it is not sufficiently heated and is contaminated by gases released by heating a portion of the getter material and other electrodes.

As a result, the efficiency of electron emission from the cathode has decreased.
In order to prevent contamination of the cathode, it is effective to energize the heater in advance to raise the cathode temperature. However, after attaching a socket for energizing the heater to the stem pin of the neck section and heating the cathode, the socket is removed from the stem pin, the neck section is inserted into the getter heating coil, and the socket is attached to the stem pin again. The getter is flashed while heating the cathode, and then the socket is removed from the stem pin, the neck is removed from the heating coil, and the socket is attached to the stem pin to start aging, which requires a lot of work to attach and detach the socket. It was complicated and hot. In particular, if the above-mentioned work 1 is to be performed automatically by a machine, a very complicated machine is required. The present invention aims to provide a getter flush method that eliminates the drawbacks of the conventional getter flush device described above, makes it possible to reduce the number of times the socket is attached and detached, and facilitates mechanization of the work. An embodiment of the present invention will now be described with reference to FIG.

In FIG. 2, 11 is a cathode ray tube, 12 is a neck section in which an electron gun device 13 and a getter 14 are housed, and 15 is a funnel section, that is, a cone section.

A stem 16 is sealed to the end of the neck portion 12,
The aging socket 1 is attached to the stem pin 17 of the stem 16.
8 is removably attached. Further, the coil axes of the plurality of electromagnetic induction heating coils 19 arranged on the sides of the neck portion 12 are inclined with respect to the longitudinal direction of the neck portion 12 . Therefore, the magnetic field lines 20 generated by the coil 19
is applied obliquely to the getter 14 and the electron gun electrode. In the above configuration, first, the heater of the electron gun device 13 is energized via the aging socket 18 to heat the cathode to a high temperature.

With the cathode heated to a high temperature, the heating coil 19 is energized, and the getter 14 is flashed by the magnetic lines of force 20 to form a getter film, absorbing the gas inside the cathode ray tube 11, and creating a high vacuum inside the tube. shall be. Thereafter, with the aging socket 18 still attached to the stem pin 17, the electron gun device 1 is connected via the aging socket 18.
Electricity is applied to each electrode of No. 3 to perform aging. In this embodiment, the heating coil 19 can be brought closer to or moved away from the neck part 12 while the aging socket 18 is attached to the stem pin 17, so when placing or removing the heating coil 19, aging socket 18
There is no need to attach or detach the device, making the work easier.

Therefore, mechanization of the work can be easily carried out. In the above embodiment, it is effective to provide a suitable shield in order to prevent unnecessary portions from being heated by the lines of magnetic force emitted from the heating coil 19.

As is clear from the above description, according to the present invention, a heating coil for "heating" a getter disposed in the neck of a cathode ray tube is arranged so that lines of magnetic force are applied obliquely to the longitudinal direction of the neck. The heating coil can be moved closer or further away from the neck while the aging socket for heating the cathode of the electron gun device inside the neck remains attached to the stem pin. When placing and removing the aging socket, there is no need to attach or detach the aging socket, which simplifies the work and facilitates mechanization of the work.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a conventional getter flash method, and FIG. 2 is a diagram for explaining a getter flash method showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Cathode ray tube, 12... Neck part, 14... Getter, 19... Heating coil, 20... Lines of magnetic force.

Claims (1)

[Claims] 1. While supplying heating current to the cathode through a socket attached to the stem pin of the cathode ray tube, the getter and electron gun electrode sealed in the neck of the cathode ray tube are heated by a heating coil placed on the side of the neck. A method for flashing a getter, characterized in that the coil axis of the heating coil is inclined with respect to the longitudinal direction of the neck portion when the getter is flashed by electromagnetic induction heating.