US2583793A - Magnetron anode - Google Patents

Description

Jan. 29, 1952 R. B. NELSON MAGNETRON ANODE Filed July 26, 1950 Inventor: Richard B. Ne lson,

by w 4 W His Attorney- Patented Jan. 29, 1952 PATENT OF P .I'CE

MAGNETRON ODE Richard B. Nelson, Schenectady,

EN. .Y., .ass'ignor to General Electric Company, :a vcorp-oration =01 .New York Application July 26, 195(1, Ser'ialNmL175,979

.1 Claim.

"quency electromagneticart, as oscillators for in- :stance, usuallycomprises a group ofradially extending anodesegments forming at their center ,;:a generally cylindrical chamber adapted to ac- :commodate a rotating space-charge. Between theanodesegments is-fQrmed a series of'resonant cavities communicating with the space-charge I chamber. The anodes and resonant cavities are in general .made .from a solid block of material. -As is well .known to those skilled in the art, the

normally loose .coupling between the individual resonant cavities .-frequently causes the mag- ;netron apparatus to function at undesired .frequencies and in undesired modes.

Heretofore, .to overcome this objection, it has been the practice to strap alternate anodes.

.Strapping was accomplished by connecting to- ,gether alternate anodes at eachend of the .anode block. .Thisarrangement has not been completely satisfactory, especially with anode blocks of long axial length.

:What I propose is to strap alternate anode segments along the axial length of the anode structure .as .wellas at the ends thereof. 'In this way a more stable operation in the magnetron apparatus is obtained, and furthermore, anode structures of longer axial length can be used with all the resultant advantages.

Therefore, it is an object of the presentiuvention to provide an improved anode structure which .is simple to construct and which has improved performance qualities.

fItis a further object 'of "the'present invention toprovide an anode structure with strapping of alternate anode segments along the axial length of the anode structure as well as at the ends of the anode structure.

In the exemplary embodiment shown in the drawing the foregoing objects are achieved by forming the anode section from a group of dissimilar laminations. Each lamination is so constructed such that when the group of laminations is assembled or stacked together they form an anode structure in which short-circuiting straps are formed along the length of anode structure as well as near the ends of the anode structure.

The features of the invention desired to be protected are pointed out in the appended claim. The invention itself together with its further objects and advantages may be understood by reference to the following description and to the appended drawing in which Fig. 1 shows an expanded view of a unit group of laminations; Fig. 2

shows *a p'lan view in partial :section of the laminations of Fig.1 stacked together to rorm a unit group; Fig. 3 shows aside view insectionof the lamination of Fig. 1 stacked'together to form a unit group.

Referring nowto Fig. l there is shown a-group of =laminations l, "2, 3, 3, 5, 6 and of the kind utilized to form the improved anode structure or" the invention. "From an examination of this figure itis rea'dilyapparent that generally speak- *ing eacher the laminations are constructed in .a. manner so that when the laminaticns of the group are stacked together they form a unitsecton of an anode structure in :which alternate ..node segments are strapped together. The laminations are made zfrom the usual conductive material employed in anode structures, for example, copper. Around the periphery of each of the laminations are distributed a series of aliening holes 8. These holes are for the purposeof receiving pins -to mold the laminations in alignment-while they are soldered together. .An alloy of'silver and copper, or :a similar solder, is suitable for this purpose. If desired, in order '170 decrease #the losses :in the anode structure, the anode structure may :be plated with silver. .11; should be :understood that unit. groups of laminations may be stacked together ltO iorm an anode structureof relatively long axial length inxwhich there is strapping distributed along the axial length, one pair of .straps being incorporated .tin each unit group. When an :anode structure 101 this construction is incorporated .into the mag- =netrondevice :an improved magnetron device free from the aforementioned defects is .obtained.

Referring now to a :detailed, description :of the laminations shown in Fig. 1, .ilamination I comprises a series of radially extending anode sections 9 in insulated relationship at their inner ends and forming at their inner ends a generally cylindrical space adapted to accommodate a rdtating space-charge. The other ends of the anode sections are conductively connected by a ring I so that in eifect a series of openings II is formed between adjacent anode sections. These openings ll communicate with the aforementioned space-charge space. The openings ll comprise the resonators of the magnetron when the individual laminations are stacked together in operative relationship. Lamination 2 comprises a thin plate similar to lamination l except that the alternate anode sections l2 are truncated in the manner shown to about half the length of the other anode section [3. Lamination 3 is similar to the second lamination except 56 that the long anode sections I 4 are connected V respectively,

. .ing straps.

together by means of shorting bars I5. In addition, at the end of each long anode section is located a protuberance l6 about the width of the tip of the long anode section extending perpendicular to the plane of the laminations for three thicknesses of an individual lamination. The truncated sections 11 of lamination 3 do not make contact with the short-circuiting straps I5 01' with the long anode section M at their truncated ends. Lamination 4 comprises a structure similar to the structure of the lamination 2 except that all of the anode sections [8 are truncated. Lamination 5 comprises a structure identical with the structure of the lamination 3. However, when lamination 5 is assembled with the other laminations the protuberances IQ of this lamination face in opposite direction from the protuberdially extending anode sections at one end formances on lamination 3 and the protuberances of lamination 5 are aligned so that the long anode sections on the lamination 5 are stacked over the short lamination sections on lamination 3. -With this stacking arrangement the protuberances of the fifth and the third anode sections are located ,side by side and separated from each other when all of the laminations are stacked together as shown in Fig. 2. In lamination 5 as well as in lamination 3, the portion of the short-circuiting strap between long anode sections is recessed so ,as to accommodate the protuberance from the other anode section. It is essential that these protuberances avoid conductive contact with the shorting straps. -.the second anode lamination except that in the Lamination 6 is identical with assembly of the group of laminations lamination .6.is stacked so that its truncated anode sections are located over the long anode sections of the I lamination 2.

.Referring now to Figs. 2 and 3, there are shown,

plan and side views of the laminations of Fig. 1 assembled to form a magnetron anode structure. Fig. 3 is a sectional view taken along section 33 of Fig. 2. On the assembled anode structure the aforementioned short-circuiting straps connect alternate composite anode sections. Elements l5 in Fig. 3 are short-circuit- .While a unit group of an anode structure has been described, it is readily appreciated that by stacking unit groups of laminations together an anode structure of long axially length is obtained with all'the resultant advantages of a 1 long anode structure. With the strapping along the'axial length of the anode structure, the magnetron apparatus in which it is incorporated has considerably less tendency to operate at undesired frequencies.

While I have shown and described particular embodiments .of my invention, it will be obvious ing a portion of a generally cylindrical chamber and at the other end terminated in a ring to form an opening in said lamination between said anode sections and communicating with said chamber; a second lamination similar to said first lamination and having alternate anode sections truncated; a third lamination similar to said second except that the long anode sections are connected together by a short-circuiting strap, said long anode section having a protuberance on the end thereof perpendicular to the plane of said lamination, said short-circuiting strap being recessed from the extreme end of the long anode section, said truncated anode sections making no direct conductive connection with a long anode section at the end adjacent the chamber, the length of said protuberances being about the thickness of three laminations; a fourth lamination having all anode sections truncated; at fifth anode lamination similar to said third lamination except with said protuberances facing in the opposite direction and with the alternate set of anode sections truncated; a

" sixth anode lamination identical to said second circuits formed between adjacent anode segments within said anode structure communicating with said chambers and short-circuiting straps conductively connecting alternate anodes within the ,body of said anode structure.

RICHARD B. NELSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,432,827 Spencer Dec. 16, 194"! 2,443,445 Donal, Jr., et al. June 15, 1948

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