KR940002761Y1 - Filter casing of magnetron - Google Patents

Abstract

No content.

Description

Magnetron Filter Casing

1 is a side cross-sectional view of a magnetron filter casing of the prior art.

2 is a side cross-sectional view of the magnetron filter casing of the present invention.

3 is a front view of the magnetron filter casing of FIG.

4 is an enlarged sectional view of part “A” of FIG. 2;

FIG. 5 is an enlarged cross-sectional view of part “B” of FIG. 4.

6 is a graph showing a fifth harmonic leak value according to the conventional design.

7 is a graph showing the leakage of the fifth harmonic according to the present invention.

* Explanation of symbols for main parts of the drawings

10: energy generating unit 11: yoke

12: anode 13: cooling fin

14: permanent magnet 20: filter unit

21: cathode 22: choke coil

23: through-type condenser 24: fixed ground plate

25: filter box casing 26: through hole

27: fixing protrusion 30: support portion

The present invention relates to an improved type of magnetron filter casing for preventing leakage of the fifth harmonic at the fastening portion of the magnetron input terminal.

Conventional magnetron filter casing, as shown in Figure 1, the anode 12 is installed inside the yoke 11 to generate a high frequency energy, the cooling fin 13 to support and fixed it, and the anode 12 The energy generating unit 10 which consists of permanent magnets 14 attached to the upper and lower sides of the upper and lower sides to supply magnetic energy, the cathode 21 electrically connected to the anode 12 of the energy generating unit 10, and the choke. The coil 22 is composed of a fixed ground plate 24 which is connected to and fastened to the through-type capacitor 23, and a filter portion 20 including a filter box casing 25 to which the fixed ground plate 24 is attached. .

The magnetron filter casing forms four through holes 26 in the fixed ground plate 24 to which the through-type capacitor 23 is fastened, and fixes the corresponding projections 27 to the filter box casing 25. Formed and pressed together. In this method of attachment, a gap is formed between the fixed grounding plate 24 and the filter box casing 25, which lowers the shielding function. Through this gap, the fifth harmonic leaks, which causes communication failure and harmful effects on the human body. There was this.

An object of the present invention is to provide an improved type of magnetron filter casing in order to prevent leakage of the fifth harmonic that causes a communication failure at the fastening portion of the magnetron input terminal and harmfully affects the human body.

Hereinafter, the technical configuration of the present invention in detail.

The magnetron filter casing of the present invention has an anode 12 installed inside the yoke 11 to generate high frequency energy, a cooling fin 13 supporting and fixed thereto, and the anode ( An energy generating unit 10 formed of permanent magnets 14 attached to the upper and lower sides of 12 to supply magnetic energy, and a cathode 21 electrically connected to the anode 12 of the energy generating unit 10; The choke coil 22 is composed of a fixed grounding plate 24 which is connected to and fastened to the through-type capacitor 23, and a filter unit 20 including a filter box casing 25 to which the fixed grounding plate 24 is attached. 3 is a front view showing a fastening state of the present invention. Referring to the fastening state of the magnetron filter casing in detail with reference to Figure 4, the through-type capacitor 23 is fastened to the fixed ground plate 24 is attached to the filter box casing 25 as in the prior art, this fixed ground An elastic support portion 30 is formed around the edge of the plate 24 to increase airtightness. 5 shows an enlarged cross-sectional view of the support part 30, and the support part 30 of the fixed ground plate 24 attached to the filter box casing 25 has a predetermined inclination angle a and has a predetermined length L. It is a technical feature to taper. As a preferred embodiment, when the thickness of the fixed grounding plate 24 is 0.1-0.4 mm, the inclination angle a is 5 ° -40 °, and the airtightness is the best when the length L is 2-5 mm, When the thickness of the fixed grounding plate 24 is 0.5-0.6 mm, the inclination angle a is 10 ° to 30 °. When the length (L) is 3-5mm, the airtightness was found to be good.

6 is a test value showing the leakage value of the fifth harmonic according to the prior art, and FIG. 7 is a test value showing the leakage value of the fifth harmonic according to the present invention. As can be seen from the above test values, the harmonics generated by the fastening of the filter box casing and the fixed ground plate and the fifth harmonic harmful to the human body are about 25 dB lower than the leak values according to the prior art.

As described above, the present invention is a useful design that significantly reduces the leakage of the fifth harmonic that adversely affects the human body by forming a tapered support around the edge of the fixed ground plate attached to the filter box casing.

Claims (3)

Magnetron filter casing, characterized in that to form a support tapered by a predetermined length (L) with a predetermined inclination angle (a) to give elasticity around the edge of the fixed ground plate attached to the filter box casing of the magnetron. The magnetron according to claim 1, wherein the support portion forms an inclination angle (a) of 5 ° -40 ° and a length (L) of 2-5 mm when the thickness of the fixed ground plate is 0.1-0.4 mm. Filter casing. The magnetron according to claim 1, wherein the support portion forms an inclination angle a of 10 ° -30 ° and a length L of 3-5 mm when the thickness of the fixed ground plate is 0.5-0.6 mm. Filter Casing.