KR940008587Y1 - F-ceramic of cathode for magnetron - Google Patents

Abstract

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Description

F-ceramic of magnetron cathode

1 is a longitudinal sectional view showing the installation state of a general magnetron.

Figure 2 is a longitudinal cross-sectional view showing the installation state of the cathode portion of the magnetron according to FIG.

3 is a longitudinal sectional view of a conventional ceramic.

Figure 4 is a longitudinal sectional view showing an installation state of the present invention.

* Explanation of symbols for main parts of the drawings

1: F ceramic 2: Through hole

3: center lead 4: side lead

5: metallization layer

The present invention relates to the F-Ceramic of the magnetron cathode portion, and more particularly, to the molybdenumide for supporting the metalizing layer and the filament during the assembly of the cathode portion of the magnetron mounted in the microwave oven. (Molybden Lead) is firmly combined to reduce the eccentricity of the filament which is easy to occur in the manufacture of magnetron.

In general, the magnetron is a bipolar vacuum tube that produces an efficient microwave, and is used in the microwave to thaw and heat foods.

In the magnetron for a microwave oven, as shown in FIG. 1, the hot electrons generated in the filament 8 in the magnetron are arranged at the end of the plurality of vanes 10 extending from the inner wall of the anode cylinder 9 and the filament. On the electric field and magnets (12) and (13) which are discharged into the space (11) between (8) and are formed between the vanes (10) and the filaments (8). Due to the magnetic flux applied to the space 11 in the magnetic circuit composed of the lower frames 14, 15, and the upper and lower poles 16, 17, the hot electrons generate energy by the cycloid motion. Microwaves are generated by feeding the vanes 10.

Thus, microwaves are radiated out through an antenna 18 through an output consisting of an A-Ceramic 19, an exhaust pipe 20, and an antenna cap 21, and through a microwave waveguide. It is delivered in an oven to thaw and heat food.

On the other hand, the image of the filament (8) to prevent the hot electrons emitted from the filament (8) to escape to the outside of the space portion (11). Each award at the bottom. Lower shields (22), (23) are installed, the upper. Center leads (3) and side leads (4) are installed to support the lower shields (22) and (23), and the leads (3) (4) provide insulation from the outside. To ceramic ceramic ceramics 1 by brazing. Each end of the lead (3), (4) is protruded to the outside through the f ceramic (1) is coupled to the F terminal (7) for coupling the choke coil (6) by brazing.

Also, in the cathode ceramic of the magnetron as shown in FIG. 2, the conventional f ceramic 1 is formed with a plurality of through holes 2 having a diameter of about 1 to 2 mm in the f ceramic 1 as shown in FIG. And the center lead 3 and the side lead 4 made of a high melting point metal, such as molybdenum having a small diameter, are inserted into the through hole 2, and chokes are formed at the ends of the leads 3 and 4. A plurality of F terminals 7 for coupling the coils 6 are inserted, and the F terminals 7 are brazed to the metallized layer 5a formed at the end of the F ceramic 1 as shown in FIG. Are combined by.

In addition, a spiral filament 8 is fixed to the lower shield 23 coupled to the upper end of the side lead 4 through the center lead 3, and the upper end of the filament 8 is fixed to the center lead 3. It is fixed by the top shield 22 coupled to the top.

However, in the magnetron, the center lead 3 and the side lead 4 fixing the filament 8 during the initial assembly of the negative electrode part are coupled in parallel with the magnetron central axis so that they are located at the center of the anode cylinder 9 so as not to be eccentric. The terminal of the center lead (3) and the side lead (4) is coupled to several sockets several times due to the electrical property test and the power supply, etc. The braided center lead 3 and the side lead 4 are deformed and eccentric.

Therefore, since the filament 8 coupled to the center lead 3 and the side lead 4 is not located at the center of the space 11 formed in the anode cylinder 9, the generation of dark current that does not contribute to the magnetron oscillation is generated. In addition, the service life of the magnetron is not only shortened, and the time for correcting the eccentricity is long, resulting in a decrease in productivity.

In particular, when performing the process of correcting the eccentricity of the conventional f ceramic (1) phase. Since the metallization layer 5a is formed only at the lower end, the vacuum breakage phenomenon is frequently caused by the leakage of leaks in the brazing portion between the F terminal 7 and the center, the side leads 3 and 4. There were many problems, such as caused.

The present invention is to solve the above problems, the present invention by forming a metallizing layer on the inner surface of the through hole of the filament support molybdenum formed in the f ceramic, the metalizing layer and when The purpose of the present invention is to provide an f-ceramic of the magnetron negative electrode portion which can improve the service life of the magnetron by greatly reducing the eccentricity of the filament, which is easily generated during the manufacture of the magnetron, by firmly bonding molybdenum lead for filament support.

The present invention for achieving the above object is the f-ceramic of the magnetron cathode portion in which a metallization layer of a predetermined depth is formed on the inner surface of the through-hole of the f-ceramic to which the center lead and the side lead are coupled.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 4 of the accompanying drawings.

1 is a longitudinal cross-sectional view showing the installation state of the general magnetron, Figure 4 is a longitudinal cross-sectional view showing the installation state of the present invention, a plurality of through holes (2) are formed in the f ceramic (1) of the magnetron cathode portion, The center lead 3 and the side lead 4 are inserted into and fixed to the hole 2, and a metallizing layer 5 having a predetermined depth is formed on an inner surface of the through hole 2 so that the f ceramic 1 may be formed in the hole 2. The center lead 3 and the side lead 4 are configured to be firmly fixed.

The present invention configured as described above has a very thin thickness of a metal having a similar thermal expansion coefficient and a ceramic having a predetermined depth on the inner surface of the through hole 2 formed in the f ceramic 1 of the magnetron cathode portion, as shown in FIGS. 1 and 4. The center lead 3 and the side lead 4 in the through hole 2 of the f ceramic 1 due to the coating and fixing are formed to form the metallization layer 5, thereby forming a magnetron. Eccentricity due to external force during the process can be prevented.

In addition, each end portion of the center lead 3 and the side lead 4 is protruded to the outside through the f ceramic 1 to be coupled to the F terminal 7 for coupling the choke coil 6 by brazing.

In addition, the metallization layer 5 formed in a predetermined depth on the inner surface of the through-hole 2 of the f ceramic 1 has a screen having a predetermined thickness on the f ceramic 1 using a general screen printing method. When printing and printing the metal in the paste (Paste) state on the top, it is easily formed by adjusting the printing pressure, thereby reducing the leakage and dark current correction rate of the F terminal 7 part accordingly.

As described above, the present invention forms a metallizing layer 5 having a predetermined depth on the inner surface of the through hole 2 formed in the f ceramic 1 of the magnetron cathode portion, thereby providing a center lead 3 and a side lead 4. ) Is firmly coupled by brazing, so that the eccentricity of the magnetron is reduced, so that the eccentricity of the filament 8 is reduced, thereby eliminating the dark current correction process or significantly reducing the correction time, It is possible to prevent the occurrence of leakage in the brazing part between the F terminal 7 and the center, the side leads 3, and 4, which is a very useful design that greatly improves the service life, efficiency and reliability of the magnetron.

Claims (1)

The f-ceramic of the magnetron cathode portion, characterized in that the metallization layer (5) of a predetermined depth is formed on the inner surface of the through-hole (2) of the f-ceramic (1) to which the center lead (3) and the side lead (4) are coupled.