JPH0754667B2 - Magnetron device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetron device including a magnetron and an exciting circuit member thereof.

2. Description of the Related Art A magnetron device used in a microwave oven or the like is constructed, for example, as shown in FIG. 3, and the magnetron 1 has first and second magnetic pole pieces 2 and 3 facing each other at both open ends of an anode cylinder 4. Have in the department. The first magnetic pole piece 2 is provided with an output terminal lead-out metal tubular body 5, and the second magnetic pole piece 3 is provided with a cathode terminal lead-out metal tubular body 6. And the metal cylinder 5
An exhaust metal thin tube 8 is attached to the outer end surface of the via an insulating ring 7 made of ceramic or the like, and the tip of an electromagnetic wave guiding conductor 10 extending from the anode vane 4a is coupled to the metal thin tube 8. And a metal cap 9 covering the metal capillary 8.
The electromagnetic wave output is taken out from. In addition, the cathode terminal led out through the stem 11 attached to the outer end surface of the metal tubular body 6.
12 is connected to one end of a choke coil 14 inside the shield case 13, and the other end of the choke coil 14 is a feedthrough capacitor.
Connected to 15.

The ring-shaped permanent magnet 16 stacked on the first magnetic pole piece 2 in such a manner that the metal cylinder 5 is inserted therethrough is a ferrite magnet,
One magnetic pole S is magnetically coupled to the first magnetic pole piece 2. The other magnetic pole N is magnetically coupled to the second magnetic pole piece 3 through the cooling metal thin plate 17, the frame yoke 18 and the second annular permanent magnet 19 which are stacked on the other magnetic pole N.

The thin metal plate 17 interposed between the one end surface 18a of the frame yoke 18 and the annular permanent magnet 16 is made of a magnetic material and has a shape as shown in FIG. Then, the annular gasket 21 fitted in the through hole 20 formed in the one end face 18a is prevented from falling off. The annular gasket 21 is composed of a braided body of fine metal wires, plays a role of substantially closing the gap between the through hole 20 and the metal tubular body 5, and when mounted on a microwave oven or the like,
Serves as a binding packing.

However, when the electromagnetic wave introducing portion 22 of the heating chamber or the waveguide is strongly pressed against the annular gasket 21 as shown in FIG. 5 when it is attached to a microwave oven or the like, bending occurs around the hole of the metal thin plate 17. If such a situation occurs, a part of the output electromagnetic wave will enter the permanent magnet 16 side through the path shown by the arrow in the figure, and the permanent magnet 16 made of ferrite will be damaged, resulting in a dangerous result.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is therefore to provide a magnetron device which does not cause the above-mentioned danger and which can enhance the heat radiation effect of the thin metal plate.

Means for Solving the Problems According to the present invention, the thin metal plate is provided with a through hole having a short tubular collar portion. However, the collar portion is configured such that the output terminal lead-out metal cylinder body is press-fitted and pressed against the outer peripheral surface of the metal cylinder body without forming a gap.

Function With this structure, even if a strong force acts on the annular gasket, the thin metal plate hardly bends, and the gap between the through hole of the frame yoke and the output terminal lead-out metal cylinder body. Substantial occlusion of the can be reliably achieved by means of sheet metal. In addition, the heat dissipation effect of the thin metal plate can be improved.

Embodiment An embodiment of the present invention is shown in FIG. The structure shown in the figure is basically different from the structure shown in FIG. 3 in that a frame yoke is used.
A thin metal plate 23 interposed between the one end surface 18a of 18 and the annular permanent magnet 16 is formed as shown in FIG. 2, and the through hole has a short cylindrical collar portion 24. The point 24 is in pressure contact with the outer peripheral surface of the output terminal lead-out metal tubular body 5.
In addition, by disposing a plurality of claw portions 25 by cutting and raising on the circumference concentric with the collar portion 24 and bringing the claw portions 25 into contact with the inner peripheral surface of the annular permanent magnet 16, the position shift of the permanent magnet 16 is caused. Is being prevented.

However, the thin metal plate 23 made of iron or iron alloy is 0.2 to
A metal cylinder 5 is press-fitted and fixed to a short cylinder-shaped collar formed by burring and having a plate thickness of 0.5 mm.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, even if a strong force acts on the annular gasket, the metal thin plate is hardly bent, and the through hole of the frame-shaped yoke and the output terminal lead-out metal cylinder It is possible to eliminate the harmful effects caused by creating an undesired gap with the body. Further, the heat dissipation effect of the thin metal plate can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a magnetron device embodying the present invention, FIG. 2 is a perspective view of a thin metal plate of the device, FIG. 3 is a partially cutaway side view of a conventional magnetron device, and FIG. FIG. 5 is a perspective view of a thin metal plate of the device, and FIG. 5 is a partial side sectional view for explaining a mounted state of the device. 2 ... 1st pole piece, 4 ... Anode cylinder, 5 ... Metal cylinder, 16 ... Permanent magnet, 18 ... Frame yoke, 21 ... Gasket, 23 ... Metal thin plate, 24 ... ... color section.

Claims (1)

[Claims] 1. A magnetron having first and second magnetic pole pieces facing each other at both open end portions of an anode cylinder, wherein a metal cylinder for leading out an output terminal is attached to the first magnetic pole piece. An annular permanent magnet that is stacked on the first magnetic pole piece in such a manner that the metal cylindrical body is inserted therethrough, and one magnetic pole is magnetically coupled to the first magnetic pole piece, and a through hole through which the metal cylindrical body is inserted. A frame-like yoke for magnetically coupling the other magnetic pole of the permanent magnet to the second magnetic pole piece, and a thin metal plate interposed between the one end surface and the permanent magnet. An annular gasket which is located on the thin metal plate and is fitted into the through hole, and the thin metal plate is a short tubular shape that press-fits the metal tubular body and press-contacts the outer peripheral surface of the metal tubular body without forming a void. A magnetron device having a through hole with a collar portion.