JPS598244A - Magnetron anode body structure - Google Patents

Abstract

PURPOSE:To obtain a small-sized and lightweight magnetron with the diameter of an anode cylinder being made smaller without affecting a resonant frequency by forming multiple anode pieces protruding toward the center axis section from the inner peripheral surface of anode cylinder axis so that the cross section vertical to the cylinder axis is made nearly in a dog-legged shape. CONSTITUTION:Multiple anode pieces 5a, 5b, 5c, 5d, 5e, 5f... protruding toward the center axis section from the inner peripheral surface of a round anode cylinder 1 are formed so that the cross section vertical to the anode cylinder 1 axis is made in a dog-legged shape. Accordingly, if the protrusion length l1 is selected at the same value as the protrusion length l in the conventional structure, the electrical length l2 becomes l2<l. Therefore, the diameter of the anode cylinder 1 can be made smaller by making l2=l, i.e., while keeping the resonant frequency (f) the same as before.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an anode structure of a magnetron used in a microwave oven or the like.

Conventional Structure and Problems The anode structure of a magnetron usually includes a cylindrical anode body 1 and a large number of tubes protruding from the inner peripheral surface of the anode body 1 toward the central axis, as shown in FIG. rectangular flat anode piece 2 a,
2 b, 2 C, 2tl+ 28. 2 f...
...and every other anode piece 21L + 20H'
It consists of an inner pressure equalizing ring 3 that interconnects 2 el..., and an outer pressure equalizing ring 4 that interconnects the remaining anode pieces 2b, 2d, and 2f. The anode structure occupies a very large proportion of the entire magnetron, and each part of the anode structure is made of high-purity copper. Therefore, in order to make the magnetron smaller, lighter, and cost-effective, it is necessary to focus on the anode tube. 1 is preferably small in diameter. However, reducing the diameter of the anode cylinder 1 means that the anode pieces 2a, 2b, 2c...
The shortening of the inductance will therefore affect the resonant frequency.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a small, lightweight, and inexpensive magnetron in which the diameter of the anode cylinder is reduced without affecting the resonance frequency.

Structure of the Invention According to the magnetron anode assembly of the present invention, a large number of anode pieces protruding from the inner circumferential surface of the anode cylinder toward the central axis have a substantially doglegged cross-sectional shape perpendicular to the cylinder axis.

DESCRIPTION OF EMBODIMENTS In the embodiment shown in FIGS. 2 and 3, a large number of anode pieces 51L, 6b, 5C, 5d, 6eT5f, ... is bent in one direction in the middle, so that the cross-sectional shape perpendicular to the axis (cylindrical axis) of the anode cylinder 1 is shaped like a letter.

However, the anode piece 61 protrudes from the inner peripheral surface of the anode cylinder 1! If the protrusion length 11 of L, 5b, 50... is selected to be the same value as the protrusion length l of the conventional structure, the electrical length 12 is (
h>It, and /h=1, that is, it becomes possible to reduce the diameter of the anode cylinder 1 while keeping the resonance frequency f as conventional.

Note that the cross-sectional shape of the anode piece may be close to an arcuate shape, and such bending can be achieved by pressing or the like.

Effects of the Invention Since the magnetron anode structure of the present invention is constructed as described above, although the mechanical length of the anode piece is slightly larger, the length of the anode piece is approximately 31@f, and moreover, the length of the anode piece is approximately 31@f. It is possible to reduce the diameter of the much longer anode cylinder, making it possible to make the magnetron smaller, lighter, and lower in cost.

[Brief explanation of drawings]

FIG. 1 is a partially cut-away plan view of a conventional magnetron anode structure, FIG. 2 is a partially cut-away plan view of a magnetron anode structure according to the present invention, and FIG. 3 is a perspective view of essential parts thereof. 1...Anode cylinder, 6a+6bl 50,5d
・・・・・・Anode piece. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure b Figure 2 = 22 Third factor

Claims (1)

[Claims] A magnetron anode structure characterized in that a large number of anode pieces protrude from the inner circumferential surface of an anode cylinder toward a central axis, and the cross-sectional shape perpendicular to the cylinder axis is approximately dogleg-shaped.