JPS6180733A - Magnetron device - Google Patents

Abstract

PURPOSE:To provide the captioned magnetron device suitable for mass production by inserting a pair of projecting lugs provided on one piece of yoke into a slot provided in the vicinity of one side of the other piece of yoke to caulk the lugs. CONSTITUTION:Inserting a pair of projecting lugs 14, 15 of a second piece of yoke 7 into a slot 13 of a first piece of yoke 6, one side 7a of the second piece 7 of yoke is brought into close contact with a plate surface of the first piece of yoke 6. Applying, in such a state of the insertion, press force 17 for caulking to a band region 16 between the slot 13 and the side 6a, the band region 16 is bent and allowed to intrude between the projecting lugs 14, 15. Since a mutual distance between the lugs 14, 15 is narrowed as they go toward tip ends thereof, not only locking impossible to be released applied between both the pieces of yoke 6, 7, but tightening force to permit both the pieces to approach each other is applied between both pieces 6, 7 for increasing the degree of the close contact therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetron device comprising a magnetron and its excitation circuit member.

Conventional Structures and Problems Magnetro devices in which a magnetron and its excitation circuit members are combined and integrated are widely used in microwave ovens and the like. The excitation circuit member typically includes two annular permanent magnets that are stacked on one and the other pole piece of the magnetron to magnetically couple one pole to the pole piece, and both permanent magnets Q and the other pole pieces. It consists of a frame-shaped yoke that magnetically couples the yoke. The frame-shaped yoke is obtained by combining a first yoke piece with a U-shaped cross section and a second yoke piece with a flat plate shape so as to have a cross-sectional shape and tightening them with screws. The process of making several small holes and inserting and screwing bolts into these holes is complicated and is not particularly suitable for mass production.

Therefore, a caulking method as disclosed in Japanese Patent Application Laid-Open No. 49-103961 has been proposed. However, simply inserting the prongs of the other wire into the slots provided on one side of both wire iron pieces,
This caulking method that crushes and deforms the insertion part tends to create a gap between the two due to elongation of the prongs during crushing or due to variations in component precision. Not only does the mechanical strength of the magnet decrease, but the magnetic circuit resistance increases, resulting in a decrease in excitation assistance.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a magnetron device suitable for mass production in which a first yoke piece and a second yoke piece can be tightly connected by caulking.

Structure of the Invention According to the magnetron device of the present invention, a pair of prongs provided on the other yoke are inserted into a slot provided near one side of one yoke and crimped. take. The gap between the pair of protrusions narrows toward the tip, so when crimping, the band region between the -side and the slot is bent and wedged between the pair of protrusions. , it is possible to apply a tightening force between the two sets of iron pieces, and this will be explained in detail below with reference to embodiments shown in the drawings.

DESCRIPTION OF THE EMBODIMENTS As shown in FIG. The frame-shaped yoke 5 surrounding the second annular permanent magnet 4 stacked on the second magnetic pole piece at the end includes a first yoke piece 6 with a U-shaped cross section and a second yoke piece 7 with a flat plate shape. It consists of a complex made by combining and bonding so that the cross section has a cross section. However, the first and second
One magnetic pole of each of the annular permanent magnets 3 and 4 is magnetically coupled to the first and second magnetic pole pieces, respectively, and the other magnetic pole is magnetically coupled to the frame-shaped yoke 6, respectively. There is. Further, the electromagnetic wave emission terminal 8 of the magnetron 1 protrudes through the center hole of the second yoke piece 7, and the cathode terminal of the magnetron 1 penetrates the center hole of the first yoke piece 6 and protrudes from the shield case. It protrudes into the inside of the shield case 9.

It is connected to the C filter circuit member. 10 is mentioned above,
A through-type capacitor of the C filter circuit member, 11 is a radiation fin attached to the outer peripheral surface of the anode part 2, and 12 is a gasket made of a braided body of thin metal wires.

Incidentally, the connection between the first yoke piece 6 and the second yoke piece 7 is achieved by a configuration as shown in FIGS. 2 and 3. That is, the first yoke piece 6 has a slot 13 near its negative side 6a, and the second yoke piece 7 has a slot 13 near its negative side 6a.
1 that protrudes from the - side 7a and is inserted into the slot 13.
It has a pair of protruding ears 14° and 15°. However, the pair of ears 14 and 15 are cut in the shape of a .

The length L of the slot 13 is slightly larger than the distance between the outer sides of both protrusions j4.15, and the width W is slightly larger than the plate thickness T2 of the second yoke piece 7. Also, 1 pair of protruding ears 1
The protrusion length P of 4 and 15 is slightly larger than the plate thickness T of the first yoke piece 6.

As shown in FIG.
3, one side of the second yoke piece 7?
L comes into contact with the plate surface of the first yoke pieces. In this insertion state, when a pressing force 17 for caulking is applied to the band region 16 between the slot 13 and one side 6a, the band region 16 is bent and inserted between the pair of prongs 14 and 15. Dig into it. As mentioned above, the mutual spacing between the pair of prongs 14 and 15 becomes narrower toward the tip, so not only does an irremovable locking effect occur between both joint iron pieces 7, but also the two assembled iron pieces A tightening force of mutual approach acts between 6 and 7,
The abutment increases the degree of tightness.

According to the embodiment, the first yoke piece 6 was provided with the slot 13 and the second yoke piece 7 was provided with the pair of prongs 14,16, but the first yoke piece 6 was provided with the pair of prongs. An ear may be provided and a slot may be provided in the second yoke. It goes without saying that the present invention can also be applied to a type in which a frame-shaped yoke is formed by a combination of three or more yoke pieces.

Effects of the Invention Since the present invention is configured as described above, the first yoke piece and the second yoke piece forming the frame-shaped yoke can be tightly connected by caulking, and have a high mechanical strength and a magnetic yoke. A highly efficient magnetron device with low circuit resistance can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetron device that is a practical example of the present invention.
Figure 2 is a perspective view of the main parts of the device before caulking;
The figure is a cross-sectional view of the main parts of the same device after caulking. 1... Magnetron, 2... Anode part, 3,
4... Annular permanent magnet, 5... Frame-shaped yoke, 6
...First yoke piece, 7...Second yoke piece, 1
3... Slot, 14.115... Pronged ear, 16... Band area. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A frame-shaped yoke for an excitation circuit that surrounds the anode part of the magnetron and the permanent magnet on its magnetic pole piece is composed of at least first and second yoke pieces coupled to each other, and the first yoke piece is connected to the second yoke piece.
The first yoke has a slot near one side through which a pair of protrusions are inserted, and the distance between the pair of protrusions becomes narrower toward the tip. A magnetron device characterized in that the coupling is achieved by a band region between the two being bent and biting into a pair of protrusions.