JPH01176629A - Magnetron - Google Patents

Abstract

PURPOSE:To make it possible to further reduce the size of a magnetron by slotting a passage hole for a slender conductor, for guiding out a microwave output and extending from an anode vane, to pass through so that the conductor passes through the slot along the longitudinal direction of the slot. CONSTITUTION:A tapered annular-shaped magnetic pole piece 10 provided at one opening end of an anode cylinder body 1 has a slot 11 at an eccentric position. A conductor 12 for guiding out a microwave output and extending from an anode vane passes through the slot 11 without coming into contact with the slot 11 and lies in the slot 11 along the longitudinal direction of the slot 11. This arrangement makes it possible to shorten the projecting length on the output side of a magnetron without shortening the conductor, namely without lowering the transmission efficiency, and to increase the size of the conductor for guiding out the microwave output by the amount which lies along the slot.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetron used in microwave heating equipment such as a microwave oven.

Conventional technology A magnetron used in microwave heating equipment such as a microwave oven is usually configured as shown in FIG. It has a large number of rectangular anode vanes 3 on its inner peripheral surface that protrude to form a cavity resonator, and a forest-like magnetic pole piece 4 is attached to one open end. In addition, the elongated microwave output deriving conductor 5 whose base edge is fixed to one of the anode vanes 3 is connected to the circular through hole 6 bored in the inclined surface of the magnetic pole piece 4 without contacting (penetrating) it. and reaches a microwave output terminal 7 which also serves as an exhaust pipe.The microwave output terminal 7 is
It is sealed to an eyelet-shaped sealing metal tube 9 via an insulating ring 8 made of ceramic, and the outer peripheral edge of the flange portion of this metal tube 9 is hermetically sealed to the open end of the anode body 1. There is.

Problem to be Solved by the Invention The microwave energy resonated in the cavity resonator is transferred to the microwave output terminal 8 through the microwave output deriving conductor 6.
However, if the total length of the conductor 6 is less than a predetermined value, excitation at the resonant frequency will be difficult to occur and the transmission efficiency will decrease.

Therefore, if an attempt is made to miniaturize the tube by shortening the protrusion length on the output side of the magnetron, there is a problem in that the conductor 6 is also shortened and the transmission efficiency is reduced.

Means for Solving the Problems The present invention has been made to solve the above-mentioned conventional problems.According to the magnetron of the present invention, a magnetic pole provided at one open end of an anode cylinder. A through hole is formed at an eccentric position of the piece and passes through the elongated microwave output deriving conductor extending from the anode vane, and the through hole is not circular but is formed into a slot having an elongated planar shape such as an arc shape, and The conductor is configured to penetrate through the slot substantially along the longitudinal direction of the slot. Note that the longitudinal length of the slot is preferably 2.5 times or more the widthwise length.

Function: With this configuration, the microwave output deriving conductor can be made longer by the length of the conductor lying along the slot, and the conductor can be made shorter (i.e. 1. The output side protrusion length can be shortened or shortened.

EMBODIMENTS Next, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, a slotted magnetic pole piece 10 provided at one open end of the anode cylinder 1 has a slot 11 at an eccentric position. As mentioned above, the microwave output conductor 12 extending from the anode vane passes through the slot 11 without contacting it.
Slot] 1 lies along the longitudinal direction of the slot 11.

The planar shape of the slot 11 may be an arc curved along an arc centered on the tube axis as shown in FIG. 2, or may be linear as shown in FIG. 3. however,
The length in the longitudinal direction is set to be 2.5 times or more the length W in the width direction.

As mentioned above, the microwave energy resonated in the cavity resonator is transmitted to the microwave output terminal section through the microwave output deriving conductor 12.
Since the portion from 1 to 1 lies within the slot 11, the conductor 12 can be made longer and the length of the output side protrusion of the magnetron can be shortened without shortening the conductor 12.

Effects of the Invention As described above, according to the present invention, the length of the output side protrusion of the magnetron can be shortened or shortened while maintaining the total length of the microwave output deriving conductor at a predetermined value, that is, without reducing the transmission efficiency. , further miniaturization of the magnetron becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of an embodiment of the present invention, FIGS. 2 and 3 are plan views of the main parts of the same embodiment, and FIG. 4 is a side sectional view of a part of a conventional magnetron. . 1...Anode cylinder, 10...
・Magnetic pole piece, 11...Slot, 12...
・・・・・・Conductor for deriving microwave output. Name of agent Patent attorney Toshio Nakao and 1 other person

Claims (2)

[Claims] (1) A slot is formed as a through hole that is bored at an eccentric position of a magnetic pole piece provided at one open end of the anode cylinder, and is passed through the elongated microwave output conductor extending from the anode vane; The magnetron is characterized in that the conductor passes through the slot substantially along the longitudinal direction of the slot. (2) The magnetron according to claim 1, wherein the length in the longitudinal direction of the slot is 2.5 times or more the length in the width direction.