JPH0414734A - Magnetron - Google Patents

Abstract

PURPOSE:To prevent erroneous operation in an antenna installing process by making the thicknesses of vains alternately different as defined. CONSTITUTION:To a vain 1 of larger thickness w1, a large-size strap ring 4 which forms an outside is brazed, and to a vain 2 of smaller thickness w2 a small-size strap ring 5 which forms an inside is brazed. An antenna 6 with the cutoff portion of larger width w3 is installed on the vain 1 of larger thickness w1 connected to the outside strap ring 4. An antenna 8 with the cutoff portion 9 of smaller width w4 is installed on the vain 2 of smaller thickness w2. In this way, wrong connection can be prevented.

Description

[Detailed Description of the Invention] [Industrial Fields of Application] The present invention is directed to antenna mounting to prevent work errors in the process;
This invention relates to a magnetron suitable for mass production that improves yield.

[Prior Art] Conventionally, it has been common sense to use vanes with the same thickness for forming a group of cavity resonators in a magnetron (for example, Utility Model Application No. 53-20850, Publication No. 57-25937, etc.). Note that Japanese Utility Model Application Publication No. 54-98163 discloses a vane in which only one of the plurality of vanes has a different specification from the others.

[Problems to be Solved by the Invention] As is well known, in order to synchronize the oscillation phase of each resonator of the cavity resonator group formed on the anode side of the magnetron, an anode protruding from the inner circumferential wall of the cylinder toward the center. A plurality of vanes, each forming a wall of a cavity resonator, are alternately electrically connected to each other by equalizing rings (strap rings). The strap ring used for this purpose is
Two types of diameters are made, one of which is larger than the other's outer diameter, and the larger diameter one is provided with a part that protrudes further outward to correspond to the vane space. It is electrically connected to the large-diameter side wall surface of the notch formed on the end surface in the axial direction of the tube, and the small-diameter one is provided with a part that protrudes further inward corresponding to the vane-hole, so that the notch on the vane end surface electrically connected to the small diameter side wall surface of the

The vane is connected to a large diameter strap ring or
Depending on whether the vane is connected to a small-diameter strap ring, the state of the oscillation current flowing through the vane, the high-frequency potential distribution of each part of the vane, etc. differ. Therefore, the output characteristics also differ depending on whether the end of the antenna for output extraction is connected to a vane connected to a large-diameter strap ring or to a vane connected to a small-diameter strap ring. . In order to make the product quality consistent with the same standard characteristics, it is specified for each type of magnetron which of the two types of vanes the end of the antenna should be connected to.

However, in conventional magnetrons, all the vanes have the same thickness as mentioned above, so in the mass production process, it is possible that the antenna connection may not be made as specified in the design. Ta. If we decide to use either of the above two types of connection between the antenna and the vane, the characteristics of shipped products will vary greatly,
This makes it difficult for users to use.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetron in which the connection between an antenna and a vane is naturally and uniquely determined, and in which an incorrect connection contrary to design specifications does not occur.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of vanes protruding from the inner circumferential wall of the anode cylinder toward the center to form a cavity resonator group. In a magnetron whose ends are attached to vanes to extract microwave output, the wall thickness of every other vane is alternately set to different predetermined dimensions.

In addition, in combination with the anode formed as described above, the attachment of the antenna end to the vane is completely impossible by making a cut in the part that matches the specific thickness of the vane. I made it so that

[Effect] If you do the above, the diameter will be large (or small).
It is obvious to the operator which set of vanes (thick set or thin set) the strap ring should be connected to, and it is also easy to automate this work. The prevention of incorrect connection between the intended antenna and the vane can be completely achieved by providing a notch that matches the thickness of the vane at the end of the antenna to be connected to the vane as described above.

In addition, according to the extrusion method (hobbing method), it is extremely difficult to alternately form the thickness of the plurality of vanes protruding toward the center from the inner circumferential wall of the anode cylinder to different predetermined dimensions. It can be easily achieved.

[Embodiment] FIG. 1 is a plan view of an anode cylinder according to an embodiment of the present invention. A strap ring 4 with a large diameter on the outside is hard-brazed to the vane 1 with a large wall thickness w1, and a strap ring 5 with a small diameter on the inside to the vane 2 with a small wall thickness w2.
It is hard soldered.

The antenna 6 is shown attached to the vane 1 having a large wall thickness w1. The width w3 of the notch 7 of the antenna 6 is slightly larger than the wall thickness w1 of the vane 1 so that hard brazing is easier to perform. The width dimension W of this antenna notch 7 is much larger than the wall thickness dimension W2 of the vane 2, and it can be easily seen just by looking at it. An antenna 8 is shown that is attached to a vane 2 having a small wall thickness w2. Notch 9 of antenna 8
The width w4 of the antenna 8 is slightly larger than the wall thickness w2 of the vane 2 in order to make the hard brazing work easier, but it is smaller than the wall thickness W of the vane 1. It is completely impossible to attach it to 1.

As mentioned above, according to one aspect of the present invention, if an antenna is specified to be attached to a particular vane.

There is no chance of accidentally attaching it to another vane.

In addition, like the anode whose plan view is shown in FIG. 4, a set of vanes 1 with a large wall thickness w6 and a set of vanes 2 with a small wall thickness w5 are made, and the wall thickness of a part of the vane 1 is You may also change this to emphasize the difference from Bane 2.

[Effects of the Invention] As explained above, according to the present invention, antenna attachment prevents work errors in the process, and high quality magnetrons with well-matched characteristics can be easily mass-produced with a high and stable yield. It becomes like this.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an anode cylinder according to an embodiment of the present invention. Figure 2 shows an antenna attached to a thick-walled vane connected to an outer strap ring, Figure 3 shows an antenna attached to a thin-walled vane connected to an inner strap ring, and Figure 4 shows an antenna attached to a thin-walled vane connected to an inner strap ring. FIG. 7 is a plan view of an anode cylinder according to another embodiment of the present invention. 1...Vane with large wall thickness, 2...Vane with small wall thickness, 3...Anode cylinder, 4...Outer large diameter strap ring, 5...Inner small diameter strap ring, 6... Antenna, 7... Notch, 8 Fig. 1 Fig. 2 (cL) (shi) t: fA force廂Ensho 4;-) Mi;, Iso0; Person, Totsubu song. 5;・1・1 All human traps 'Lua' (cL) Figure (b Figure

Claims (1)

[Claims] 1. In a magnetron in which a plurality of vanes are provided that protrude toward the center from the inner peripheral wall of the anode cylinder to form a cavity resonator group, and the end of the antenna is attached to the vanes to extract microwave output, the vane A magnetron characterized in that the wall thickness of every other magnetron is alternately set to different predetermined dimensions.