JPH0538517Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a traveling wave tube, and more particularly to a novel fixing structure for a periodic magnetic field focusing device of a traveling wave tube.

BACKGROUND ART A so-called traveling wave tube has an electron tube section that includes an electron gun that forms an electron beam, a slow wave circuit that amplifies a high-frequency signal, a collector that efficiently collects the electron beam, and the like. A periodic magnetic field focusing device is provided around the slow wave circuit of the electron tube section to prevent the electron beam from scattering and allow it to pass through the slow wave circuit, thereby operating the traveling wave tube efficiently.

Figures 5 and 6 mainly illustrate the configuration of the periodic magnetic field focusing device and the conventional configuration of the entire traveling wave tube, and Figure 5 is a perspective view showing the configuration of the slow wave circuit and its surrounding members. 6 is a cross-sectional view of the slow wave circuit shown in FIG. 5 taken along line A--A in FIG. 5. A periodic magnetic field focusing device is generally constructed by alternately arranging a plurality of annular magnets 1 made of alnico, samarium cobalt, etc., and a plurality of pole pieces 2 also made of a magnetic material such as pure iron. be done. As shown in FIG. 6, the periodic magnetic field focusing device 3 and the slow wave circuit 4 are arranged concentrically with each other, and the electron beams passing through the slow wave circuit 4 are mutually affected by the electric charges of the electrons. A periodic magnetic field focusing device 3 focuses the electron beam so that the electron beam does not expand in diameter due to repulsion.

In order to prevent the optimal positional relationship between the electron beam and the periodic magnetic field focusing device from being disturbed due to vibrations, shocks, etc. applied to the traveling wave tube, these periodic magnetic field focusing devices have a diameter approximately equal to the outer diameter of the annular magnet 1. It is installed on a pedestal 5 having a recess. At this time, in order to efficiently release the heat generated in the slow wave circuit 4 to the outside,
A presser metal fitting 6 made of a lightweight material with excellent thermal conductivity, such as aluminum, is placed on top, and the presser metal fitting 6 is fixed to the pedestal 5 with screws 7 or the like.

In actual assembly of a traveling wave tube, the electron gun 8 is placed on the electron gun pedestal 9 and the collector 10 is placed on the collector pedestal 11 in the same positional relationship as the periodic magnetic field focusing device 3 is placed on the pedestal 5. be placed. An annular magnet 1 is used to correct the misalignment between the central axes of the periodic magnetic field focusing device 3 and the slow wave circuit section 4, and to correct the biased magnetic field in the cylindrical direction of the periodic magnetic field focusing device 3.
is adjusted so that the amount of the electron beam generated by the electron gun 8 colliding with the slow wave circuit 4 is minimized.

When this adjustment is completed, the presser metal fitting 6 is fixed to the pedestal 5 with the screw 7 to prevent the adjustment of the periodic magnetic field focusing device 3 from going out of order.

Furthermore, in order to reduce the amount of electron beams that impinge on the slow wave circuit to the utmost limit and to satisfy the given characteristics of the traveling wave tube, so-called beam transmission adjustment is carried out.
A small magnetic piece 12 is attached to the outer peripheral surface of the slow wave circuit section 3. Once this transmitted beam adjustment was completed, the annular magnet 1, pole piece 2, and small magnetic piece 12 were fixed with adhesive.

Problems to be solved by the invention However, as can be seen from FIG.
It is fixed only by mechanical compression by the presser metal fitting 6. Therefore, when the traveling wave tube repeatedly operates/stops and a thermal history occurs, these members may become misaligned.

In order to avoid this, when assembling the presser metal fitting 6, it is possible to fix the annular magnet covered by the presser metal fitting 6 with adhesive, but in an actual traveling wave tube, the final beam transmission Even if the adjustment is performed, there may be cases where the given characteristics cannot be satisfied, and in this case, the adjustment of the annular magnet must be started again. However, if the annular magnet under the presser is fixed with adhesive, readjustment is impossible, and as a result, the entire traveling wave tube must be discarded as defective.

As described above, conventional traveling wave tubes have a short lifespan due to the annular magnet hidden under the holder, and if adhesive is used to assemble the holder to avoid this, the product yield will be reduced. The problem was that it got worse.

SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling wave tube with a novel configuration in which all the annular magnets can be adjusted and fixed even after the presser fittings are assembled.

Means for Solving the Problems According to the present invention, an electron gun, a collector receiving the electron beam from the electron gun, and a slow wave circuit located between the electron gun and the collector,
a periodic magnetic field focusing device provided around the slow wave circuit so that the electron beam passes through the slow wave circuit; a pedestal on which the periodic magnetic field focusing device is placed; and a pedestal for placing the periodic magnetic field focusing device on the pedestal. A traveling wave tube comprising: a holding metal fitting attached to the periodic magnetic field focusing device so as to be fixed thereon; the holding metal fitting has a plurality of holes formed in a portion that comes into contact with the periodic magnetic field focusing device; A traveling wave tube is provided in which the holes are filled with an adhesive having excellent thermal conductivity.

Function As mentioned above, in the traveling wave tube according to the present invention, a hole is made in the holding metal fitting, and the annular magnet and pole piece of the part covered with the holding metal fitting are glued through the hole. It can be fixed with.
Therefore, even if the traveling wave tube undergoes thermal history due to repeated operation/stopping, these members can prevent displacement.

After performing the final beam transmission adjustment, the annular magnet or pole piece covered by the presser can be fixed with adhesive through the hole in the presser, allowing final beam transmission adjustment. If the given characteristics cannot be satisfied even after this, it is possible to start adjusting the annular magnet again.

Furthermore, if it becomes necessary to adjust the position of the annular magnet underneath after fixing the presser metal fitting, you can continue to adjust the position of the magnet under the presser metal fitting using this hole. It is possible.

In addition, adhesive is filled through the hole into the gap between the annular magnet, the pole piece, and the presser fitting to increase the adhesion between these members and the presser fitting,
It becomes possible to efficiently transmit and dissipate the heat generated in the slow wave circuit to the outside.

EXAMPLES The present invention will be described in more detail below with reference to the attached drawings, but what is shown below is only an example of the present invention and does not limit the technical scope of the present invention in any way. do not have.

FIG. 1 is a perspective view showing the configuration of a traveling wave tube constructed according to the present invention.

As shown in FIG. 1, the overall configuration of a traveling wave tube is basically the same as a conventional traveling wave tube.
That is, the periodic magnetic field focusing device is composed of a plurality of annular magnets 21 and a plurality of annular pole pieces 22 that are alternately arranged concentrically with the slow wave circuit. This periodic magnetic field focusing device is placed on a pedestal 25 having a recess approximately equal to the outer diameter of the annular magnet 1. At this time, the electron gun 28 and collector 30
They are also placed on pedestals 29 and 31 that match their respective shapes.

Here, the first transmission beam adjustment is performed. That is, the electron beam formed by the electron gun 28 is aligned with the central axis of the periodic magnetic field focusing device 4, and the polarized magnetic field of the periodic magnetic field focusing device is used to collide with, for example, a helix constituting the slow wave circuit section. Adjustments are made by rotating the annular magnet 21 so as to minimize the amount of electron beam generated. Then, when the number of electron beams colliding with the helix is at a minimum and no further improvement is desired, the presser metal fitting 26 is assembled to sandwich the periodic magnetic field focusing device 23 between it and the pedestal 25, and the screw 27 Fix it.

As shown in FIG. 2, this presser metal fitting 26 is
A plurality of oval holes 40 are provided. This hole 40 is provided so that the annular magnet and the pole piece located under the presser metal fitting 26 can be fixed with adhesive, and also so that the annular magnet and the pole piece can be accessed from the outside through the hole 40. The traveling wave tube has an oval shape that is elongated in the tube axis direction, and its major axis is at least larger than the thickness of the pole piece, and each hole 40 has one pole piece 22 and two annular magnets 21. are arranged so that they can be seen.

After fixing the periodic magnetic field focusing device 23 so that it does not easily rotate with such a presser metal fitting 26, precise beam transmission adjustment is performed using a small magnet piece. That is, the small magnet piece 32 is attached to the surface of the periodic magnetic field focusing device 23, and the adhesion position of the small magnet piece 32 is adjusted so that the electron beam satisfies predetermined electrical characteristics.

If it is confirmed that predetermined electrical characteristics have been obtained through this beam transmission adjustment, adhesive is applied between the periodic magnetic field focusing device 23, the pedestal 25, and the small magnetic piece 32, and these members are Fix the positional relationship.

At this time, by injecting adhesive through the hole 40 of the presser metal fitting 26, the annular magnet 21 and the pole piece 22 covered by the presser metal fitting 26 can also be fixed.

Furthermore, by injecting an adhesive with relatively good fluidity and thermal conductivity through the hole 40 of the presser metal fitting 26, the adhesion between the annular magnet 21 and the pole piece 22 and the presser metal fitting 26 is improved, and the adhesive is retarded. Heat generated in the wave circuit can be efficiently dissipated to the outside.

In addition, if the predetermined electrical characteristics cannot be obtained even with the precise beam transmission adjustment using the small magnet piece 32, remove the holding metal fitting 26 or open the hole 40 of the holding metal fitting 26. Then, the adjustment by rotating the annular magnet 21 will have to be done again. At this time, hold down metal fitting 2
6 through the hole 40 drilled in the presser metal fitting 26.
Since the annular magnet 21 located below can also be rotated, complete adjustment can be carried out again without removing the presser fitting 26, which is convenient.

Now, FIG. 3 is for explaining a different aspect of the traveling wave tube according to the present invention, and only the holding metal fitting 26 thereof is taken up and shown as holding metal fitting 26'.

The holding fitting 26' has a hole 40' which is longer in the tube axis direction of the electron tube to be fixed, and the annular magnet 21 and the pole piece 22 of the periodic magnetic field focusing device 23 fixed by the holding fitting 26 are It is structured so that several parts can be seen. In addition, the holes 40' are arranged little by little in the tube axis direction, and with a single design of the holding fitting, the periodic magnetic field focusing device 23 of different standards, that is, the annular magnet 2
1 and pole piece 22 having different thicknesses.

FIG. 4 is for explaining a further different aspect of the traveling wave tube according to the present invention.
It is shown as

The presser metal fitting 26'' is a long hole 4 in the circumferential direction of the annular magnet 21 of the periodic magnetic field focusing device 23 to be fixed.
0'' and visible through the hole.
can be rotated more easily. Therefore, if the thickness of the annular magnet 21 is predetermined, it is advantageous because the annular magnet 21'' located below the presser metal fitting 26'' can be adjusted more easily.

Effects of the Invention As detailed above, in the traveling wave tube according to the present invention, after the holding fitting is attached and the annular magnet of the periodic magnetic field focusing device is finally adjusted, the adhesive is applied through the hole provided in the holding fitting. By injecting
Even if the periodic magnetic field focusing device is completely fixed and subjected to external vibrations or shocks during use,
Its initial desirable electrical properties can be maintained. Therefore, it is possible to realize a highly efficient traveling wave tube in which adjustment is unlikely to go out of order.

Furthermore, by using an adhesive with excellent thermal conductivity when injecting the adhesive, the adhesiveness between the presser metal fitting and the periodic magnetic field focusing device is improved, and the heat generated in the slow-wave circuit section is dissipated more efficiently. becomes possible.

Further, in the traveling wave tube according to the present invention, the annular magnet of the periodic magnetic field focusing device can be adjusted with the holding fitting attached. Therefore, beam transmission adjustment can be easily performed even after the traveling wave tube is assembled.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a traveling-wave tube according to the present invention, and FIG. 2 is a perspective view showing in more detail a clamp of the traveling-wave tube shown in FIG.
3 and 4 show different embodiments of the clamp shown in FIG. 2, and FIG.
FIG. 6 is a perspective view showing the configuration of a conventional traveling-wave tube, and FIG. 6 shows the traveling-wave tube shown in FIG.
FIG. 1 is a cross-sectional view taken along line A-A in the drawing.
22 ... pole piece; 3, 23 ... periodic magnetic field focusing device; 4 ... slow wave circuit; 5, 25 ... base of periodic magnetic field focusing device; 6, 26, 26', 26" ... clamp; 7, 27 ... screw; 8, 28 ... electron gun; 9, 29 ... base of electron gun; 10, 30 ...
Collector, 11, 31... Collector's pedestal, 1
2, 32... small magnet pieces, 40, 40', 40"...
hole.

Claims (1)

[Scope of utility model registration request] an electron gun, a collector that receives an electron beam from the electron gun, a slow wave circuit located between the electron gun and the collector, and a slow wave circuit that allows the electron beam to pass through the slow wave circuit. a periodic magnetic field focusing device provided around the periodic magnetic field focusing device, a pedestal on which the periodic magnetic field focusing device is placed, and a presser mounted on the periodic magnetic field focusing device so as to fix the periodic magnetic field focusing device on the pedestal. A traveling wave tube comprising: a plurality of holes formed in a portion of the holding metal fitting that comes into contact with the periodic magnetic field focusing device;
A traveling wave tube whose holes are filled with an adhesive with excellent thermal conductivity.