JPS61260587A - High frequency coil for local heating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a high-frequency heating coil suitable for local heating.

[Background of the invention]

Conventional high-frequency heating coils were formed by shaping only the high-frequency coil into various shapes suitable for the shape of the material to be heated ("Vacuum Tube Materials and Ultra-High Vacuum Technology" by Shukichi Fukagawa (Ohmsha)). (pp. 258-260) For example, as shown in FIG.
In the case of heating from the outside, a high-frequency coil 4 wound in a hollow shape as shown in FIG. By applying electricity, the shigetsuter 2 was heated by high frequency. In another example shown in FIG. 2, a spirally wound high-frequency coil 5 is disposed close to the side surface of the electron gun assembly 1 to heat the getter 2.

However, even if an attempt is made to heat only the getter 2 using a high-frequency coil 4 as shown in FIG. 1, all of the electrodes of the electron gun assembly 1 disposed within the high-frequency coil 4 are heated and the electrodes are deformed. was there. Further, when a high-frequency coil 5 as shown in FIG. 82 is used, the electrode of the electron gun assembly 1 in the vicinity of the getter 2 is heated, resulting in the same problem as described above.

[Purpose of the invention]

An object of the present invention is to provide a high-frequency coil for local heating that can locally heat only a predetermined object to be heated.

[Summary of the invention]

In order to achieve such an object, the present invention comprises a heating high-frequency coil that is a combination of a ferrite core and a high-frequency coil.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

Figures 3-) and 3) are rounded diagrams illustrating an embodiment of the high-frequency coil for local heating according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. In the figure, the heating high-frequency coil 6 is configured by closely winding a high-frequency coil 8t around the outer peripheral surface of a cylindrical ferrite core 7. Then, as shown in FIG. The electron gun assembly 1 is arranged so that the magnetic flux is concentrated in the
Only the getter 2 attached to the getter 2 can be intensively heated with high frequency.

FIGS. 4(a) and 4(b) are diagrams for explaining another embodiment of the present invention, and the same parts as in the previous figures are given the same reference numerals. In the figure, the heating high-frequency coil 6' has a ferrite core 7 having a flat plate shape, and an end portion adjacent to the glass tube 3 having a curved surface 7a that is almost the same as the curved surface of the glass tube 3. There is.

According to such a configuration, the heating high frequency coil 6' is
Since the end of the ferrite core 7 forms a curved surface 7a, the distance between the end and the getter 2 can be made as small as possible, and since the magnetic flux emitted from the curved surface 7a tends to be focused toward the getter 2, only the getter 2 can be used. can be locally heated. In this case, the cross-sectional area of the ferrite core 7 facing the getter 2 can be made small, and the thickness direction of the plate-shaped ferrite 7 is oriented in the direction of the electrode axis, so that the local heating effect only in the vicinity of the getter is even better than in the embodiment shown in FIG. There is.

FIGS. 5(a) and 5(b) are diagrams for explaining still another embodiment of the present invention, and the same parts as in the previous figures are given the same reference numerals. In the same figure, different parts from Fig. 4 are shown.
A ferrite core T is formed in an E shape having curved surfaces 7a at three convex ends, and a high frequency coil 8 is wound around the central convex portion 7b to constitute a heating high frequency coil 6''.

According to such a configuration, the same effect as described above can be obtained, and in this embodiment, the outermost two convex portions of the E shape are used as the return path (re-turn path) of the magnetic circuit.
), only the getter 2 can be intensively and efficiently heated with high frequency.

〔Effect of the invention〕

As explained above, according to the present invention, since the heating high-frequency coil is configured by a combination of a ferrite core and a high-frequency coil, the object to be heated can be intensively and efficiently high-frequency heated.

[Brief explanation of drawings]

1 and 2 are diagrams showing an example of heating a getter attached to an electron gun body using a conventional heating high-frequency coil, and FIG. 3 is an illustration of an example of a heating high-frequency coil according to the present invention. Figure 4. FIG. 5 is a diagram for explaining another embodiment of the present invention. 6, 6', 6'...Heating high frequency coil, 7
...Ferrite core, 7a...Curved surface, 8...
-High frequency coil. Agent: Patent Attorney Katsuo Ogawa, (, -

Claims (1)

[Claims] A high-frequency coil for local heating that locally heats only a predetermined portion of the heated object by placing a coil that conducts high-frequency current in close proximity to the heated object, characterized in that a plate-shaped ferrite core is disposed within the coil. A high-frequency coil for local heating.