JPS6048857B2 - How to manufacture a magnetron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetron, and particularly to a method for evacuating the inside of a magnetron tube.

Generally, an exhaust pipe made of a soft metal such as copper is formed protruding from the anode portion of the magnetron, and the inside of the magnetron tube is evacuated to a vacuum through the exhaust pipe.

In this case, it is important to have an exhaust port in airtight communication with the distal end of the exhaust pipe, and the distal end of the exhaust pipe is processed into various shapes. However, about 6wr
Outer diameter of 1n~8wL and about 0.8W0n~1.0Trr
! If complicated processing is applied to an exhaust pipe having a wall thickness of rL, it is inevitable that a considerable increase in cost will be caused. The present invention has been made with the above-mentioned points in mind, and a method for manufacturing a magnetron according to the present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, an anode cylinder 2 surrounding a cathode 1 has a magnetic pole piece 3 sealed at one open end thereof, and metal rings 4, 5 made of Kovar or the like are attached to the outer end surface of the magnetic pole piece 3. An exhaust pipe 7 made of a soft metal such as copper is formed to protrude through an insulating ring 6 made of ceramic or the like.

Further, the other end of the electromagnetic wave guiding conductor 9, one end of which is fixed to one of the many anode vanes 8 protruding from the inner peripheral surface of the anode cylinder 2 toward the cathode 1, is located in the exhaust pipe 7. ing.
The tip 10 of the exhaust pipe 7 and the open portion adjacent thereto are made thinner than the crush sealing portion 11, and the tip 10 is processed into a flared shape that opens at the tip.

As shown in FIG. 2, such a flared tip 10 is obtained by making the exhaust pipe tip and the neck portion adjacent thereto thin in advance, and press-fitting a punch-like jig 12 into the thin tip. It can be formed relatively easily. A large-diameter opening is formed at the tip of the flared tip 10, which is held between the front and back sides by the exhaust port 13 as shown in FIG.

That is, the exhaust port 13 includes a pipe 14 that communicates with an exhaust pump (not shown) and has a conical tip surface that is in close contact with the inner surface of the flared tip 10, and a cap tube 15 that is screwed into the tip of the pipe 14. It consists of a presser tube 16 that is housed in the cap tube 15 and presses the flared tip 10 from the outside. It is held airtight. After driving the exhaust pump in the clamped state shown in FIG. 3 to evacuate the inside of the magnetron tube, the crushing sealing part 11 shown in FIG.
It is conventional to perform pinch-off by crushing at position 17 and cut at position 17, but in the present invention, the tip part of the exhaust pipe and the neck part adjacent thereto are particularly made thinner than the crushing sealing part. In addition, since the tip is formed into a flared shape that opens at the tip, an opening larger than the outer diameter of the exhaust pipe can be formed at the tip at a low cost using extremely simple tools and machining. This enables communication over a wide bonding area.

Further, the hole diameter of the vibrator 14 can be set to be approximately equal to the exhaust pipe hole diameter, and the exhaust efficiency can be improved. Furthermore, since the thin neck portion deforms appropriately and absorbs the strain force when the crushing seal portion is crushed, the risk of this strain force spreading to the tip portion and causing leaks or cracks is eliminated.

[Brief explanation of drawings]

Fig. 1 is a side cross-sectional view of a part of a semi-finished magnetron manufactured by the manufacturing method of the present invention, Fig. 2 is a side cross-sectional view of the exhaust pipe portion of the same magnetron, and Fig. 3 is a side cross-sectional view of the exhaust pipe portion of the same magnetron and the exhaust boat. FIG. 1...Cathode, 2...Anode cylinder, 7
...Exhaust pipe, 10...Tip of exhaust pipe, 11...Crushing sealing part, 13...Exhaust boat.

Claims (1)

[Claims] 1. The tip of the calibrated metal exhaust pipe protruding from the anode of the magnetron and the neck portion adjacent thereto are made thinner than the crushing sealing portion, and the tip is formed into a flared shape that opens at the tip. A method for manufacturing a magnetron, characterized in that the flared tip is communicated with exhaust ports sandwiched from both the front and back surfaces to evacuate the inside of the tube of the magnetron, and then the crushing sealing portion is crushed.