US2659031A - Magnetron of the cavity resonator type - Google Patents

Description

Nov. 10, 1953 K. H. J. BOKHOVE 2,659,031

MAGNETRON OF THE CAVITY RESONATOR TYPE Filed March '7, 1952 2 Sheets-Sheet 1 INYENTOR Karel Herman Jon Bokhove Agent 1953 K. H. J. BOKHOVE MAGNETRON OF THE CAVITY RESONATOR TYPE 2 Sheets-Sheet 2 Filed March 7, 1952 Patented Nov. 10, 1953 Karel Herman Jan Bokhove, Eindhoven, Netherlands, assignor to Hartford National Bank and Trust Company, Hartford, Conn., as trustee Application March 7, 1952, Serial No. 275,403

Claims priority, application Netherlands April 14, 1951 30laims. ((1315-40) 2 This invention relates to magnetrons of the cavity resonator type.

Heretofore, magnetrons of the foregoing type generally comprised an anode block, containing resonant cavities, sandwiched between terminal members having a single flat surface. The terminal members were secured to the anode block by means of setting studs and solder interposed between the mating surfaces thereof. This arrangement resulted in difilculties in that the solder would flow toward the resonant cavities resulting in losses and changes in the frequency for which the magnetron was designed.

It is an object of the invention to obviate the aforesaid difficulties.

This and other objects of the invention will appear from the description that follows.

According to the invention, a magnetron of the foregoing type comprises an anode block having end faces and defining at least one resonant cavity opening into a discharge space. The anode block is provided with a passageway having a central portion of given width and end portions having a greater width co-operating therewith to form an H-shaped channel for connecting the cavity to some form of hollow wave guide. A substantially annular rim portion of the anode block which is eccentric with respect to the cavity and the discharge space is raised or depressed with respect to the surface of the block so that the inner peripheral border thereof is spaced by a given distance from the resonant cavity and the H-shaped channel. A pair of terminal members having complementary surfaces adapted to interfit with the end faces of the block are affixed thereto by solder interposed between the annular rim portion of the block and the corresponding surface of the terminal member, the surface portion adjacent the annular rim portion serving to prevent the entry of the solder into the resonant cavity or the H-shaped channel. The mating surfaces of the annular rim portion of the block and the corresponding surface of the terminal members are spaced by a small distance, of the order of about a few hundredths of a millimeter, for accommodating the solder. The peripheral edge of the small enclosure containing the solder may be tapered or otherwise widened to form a groove for holding a wire or strip of solder.

The invention will now be described with reference to the accompanying drawings wherein:

Fig. 1 is a view, in cross-section, of one form of magnetron exemplifying the invention;

Fig. 2 is a plan view of an anode block;

Fig. 3 is a perspective view of the block shown in Fig. 2;

Fig. 4 is a perspective view of. a terminal mem- Fig. 5 is a view, in cross section, of another form of magnetron exemplifying the invention.

Referring to the figures, an anode block I is sandwiched between upper and lower terminal members 3 and 2, respectively. 'A plurality of resonant cavities II to I8 open into a common discharge space Ill. Opposite ends of the resonant cavities II to I8 terminate in upper and lower terminal spaces which are designated 8 and 9, respectively. The block I is provided with a passageway I9 and channels 20' and ,2I forming an H-shaped channel extending from one of the cavities II and utilized for transmitting the energy produced in the magnetron to, for example, a hollow wave guide not shown which may be secured to projecting lugs 26, 21, 2B of the lower terminal member 2, the block I and the upper terminal member 3, respectively. The edge portions of the upper surface 4 and the lower surface 6 are depressed as shown at 5, 1 respectively, to form annular rim portions which are eccentric with respect to the discharge space I 0 and in which the inner peripheral border region of the depressed portions 5, l are spaced by a given distance from the resonant cavities II to I8 and the channels 20, 2 I.

The terminal members 2, 3 are provided with recesses 23 which conform to the surfaces 4, 6 of the block and openings 24, 25 for accommodating pole shoes and a cathode not shown. The terminal members 2, 3 and the block I are shaped such that a space of a few hundredths of a millimeter separates the depressed surface portions 5, 6 from the corresponding surface portions 22 of the terminal members 2, 3. The solder for securing the terminal plates 2, 3 to the block I is confined within the above space and prevented from entering the channels 20, 2I and the cavities II to I8 by the peripheral barrier separating the depressed portions 5, 6 from the surfaces 4,

the block I as shown in Fig. 5 in lieu of depressreadily apparent to those skilled in the art with- I out departing from the invention as defined in the appended claims:

What I claim is:

1. A magnetron anode structure of the cavity resonator type comprising an anode block having end faces and defining a resonant cavity opening into a discharge space, said block being provided with a passageway having a central portion of given width and end portions having a width greater than said given width thereby forming an H-shaped channel for connecting the resonant cavity with a hollow wave guide, each of said end faces having one portion depressed with respect to another portion thereby defining a substantially annular rim portion eccentric I with respect to said resonant cavity and said discharge space and having an inner peripheral border spaced by a given distance from the resonant cavity and the H-shaped channel, terminal plates having complementary surfaces interfit ting with the end faces of said block, and solder means securing the terminal i'nembers to said block.

2. A magnetron anode structure of thecavity resonator type comprising an anode block having end faces and defining a resonant cavity opening into a discharge space, said block being provided with a passageway having a central portion of given width and end portions having a width greater than said given width thereby forming an H-shaped channel for connecting the resonant cavity with a hollow wave guide, each or said end faces having one portion depressed with respect to another portion thereby defining a substantially annular rim portion eccentric with respect to said resonant cavity and said discharge space and having an inner peripheral border spaced by a given distance from the resonant cavity and the H-shaped channel, terminal plates having complementary surfaces interfitting with the end faces of said block, said annular rim portion being spaced by a small distance from the coresponding surface portion of said terminal members thereby defining a small space, and solder means located in said space and securing the terminal members to said block.

3. A magnetron anode structure of the cavity resonator type comprising an anode block having end faces and defining a resonant cavity opening into a discharge space, said block being provided with a passageway having a central portion of given width and end portions having a Width greater than said given width thereby forming an Hshaped channel for connecting the resonant cavity with a hollow wave guide, each of said end faces having one portion depressed with respect to another portion thereby defining a substantially annular rim portion eccentric with respect to said resonant cavity and said discharge space and having an inner peripheral border spaced by a given distance from the resonant cavity and the H- -shaped channel, terminal plates having complementary surfaces interfitting with the end faces of said block, said annular rim portion being spaced byv a few hundredths of a millimeter from the corresponding surface portion of said terminal members thereby defining a small space, and solder means located in said space and securing the terminal members to said block.

KAREL HERMAN JAN BOKHOVE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,466,922 Wax Apr. 12, 1949

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