JPS586137Y2 - magnetron device - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a magnetron, a permanent magnet stacked on the outer end surface of a first magnetic pole piece of the magnetron, and one magnetic pole magnetically coupled to the first magnetic pole piece. a frame-shaped yoke in which the other magnetic pole of the permanent magnet is magnetically coupled to the second magnetic pole piece of the magnetron; and a frame-shaped yoke that is attached to the top wall of the frame-shaped yoke and connected to the cathode terminal button of the magnetron. A magnetron device comprising a shield case for accommodating connected filter circuit components, wherein a bulge portion for immersing a portion of the permanent magnet is formed in the top wall of the frame-shaped yoke, and the bulge portion By fitting it into the periphery of a recess formed in the bottom wall of the shield case, the risk of leakage electromagnetic waves leaking out of the device through the space between the frame-shaped yoke and the shield case attached to it is prevented. This makes it possible to reduce the size of the device.

To explain the magnetron device of the present invention together with the embodiment shown in the drawings, a cylinder is coaxially stacked on the outer end surface of the first magnetic pole piece 2 of the magnetron 1 so as to surround the cathode terminal lead-out portion 3 of the magnetron 1. The shaped permanent magnet 4 is made of a cast magnet made of Alnico or samarium cobalt, and one magnetic pole N thereof is magnetically coupled to the first magnetic pole piece 2.
The other magnetic pole S of the permanent magnet 4 is an assembled frame-shaped yoke 7 consisting of a yoke 5 having a U-shaped cross section and a flat yoke 6 coupled thereto.
It is magnetically coupled to a second pole piece 9 of the magnetron 1 via a columnar permanent magnet 8 .

A shield case 10 made of non-magnetic metal is attached to the top wall of the assembled frame-like yoke 7 with screws or rivets (not shown), and a cathode terminal 11 of the magnetron 1 and filter circuit components connected thereto, i.e. A choke coil 12 button and a capacitor 13 are housed.

By the way, the frame-shaped yoke 7 has a circular bulge 14 in a circular area of its top wall, and this bulge 14 allows a part of the permanent magnet 4 to be immersed therein, and is formed on the bottom wall of the shield case 10. It fits into the circular recess 15 and tightly fits with the periphery of the recess 15.

Therefore, a portion of the permanent magnet 4 enters into the shield case 10, and relatively long permanent magnets 4 and 8 can be used without increasing the frame opening area (HXW) of the frame-shaped yoke 7.

This eliminates the uneconomical problem of the conventional method in which a blower duct (not shown) provided in communication with the frame opening of the frame-shaped yoke 7 is adapted to the type of magnetron device used.

In addition, the frame-shaped yoke 7 and the shield case 10 are not only integrally connected by screws or rivets, but also the periphery of the bulge 14 and the recess 150 fit together as described above. The contact surface is L-shaped, and there is no possibility that electromagnetic waves leaked into the shield case 10 through the cathode terminal 11 of the magnetron 1 will leak out of the device through the contact surface.

Note that 16 is a heat sink attached to the outer periphery of the anode cylinder of the magnetron 1, and 1T is an electromagnetic wave emitting antenna.

As mentioned above, in the magnetron device of the present invention,
In particular, a bulge is formed on the top wall of the frame-shaped yoke into which a part of the permanent magnet is immersed, and this bulge is fitted into the periphery of a recess formed on the bottom wall of the shield case, thereby preventing leakage of electromagnetic waves. In addition to eliminating the risk of a part of the leakage outside the device through the wide contact surface between the frame yoke and the shield case, the compatibility of the ventilation duct with the magnetron device is expanded, and the device can be made more compact. It becomes possible.

[Brief explanation of drawings]

The drawing is a partially cutaway side box diagram of a magnetron device embodying the present invention. 1... Magnetron, 4, 8... Permanent magnet, 7...
- Frame-shaped yoke, 10... Shield case, 11... Cathode terminal, 12... Choke coil, 13... Capacitor, 14... Swelling part, 15... Recessed part.

Claims (1)

[Scope of utility model registration request] a permanent magnet stacked on the outer end of a first magnetic pole piece of the magnetron and having one magnetic pole magnetically coupled to the first magnetic pole piece; A frame-shaped yoke magnetically coupled to two magnetic pole pieces, and a filter circuit component attached to the outer end surface of the top wall of the frame-shaped yoke and connected to the cathode terminal button of the magnetron. The frame-shaped yoke has a bulge portion on the top wall in which a portion of the permanent magnet is immersed, and the bulge portion is a recess formed in the bottom wall of the shield case. A magnetron device that is fitted around the periphery of the magnetron.