JP6742672B2 - Adjustment screw lock mechanism - Google Patents

Description

The present invention relates to an adjusting screw locking mechanism that can lock an adjusting screw that adjusts electrical characteristics.

Patent Document 1 discloses a conventional coaxial bandpass filter, and FIG. 15 shows a configuration of a conventional coaxial bandpass filter F100 having a similar structure. In FIG. 15, the case 101 is shown in cross section, and the upper portion of the resonator 110 is shown broken away.
The coaxial bandpass filter F100 shown in FIG. 15 is configured by cascading two filters of a first stage 001 and a second stage 002, and the first stage 001 and the second stage 002 have the same configuration. ing. The coaxial bandpass filter F100 is housed in a case 101 formed of a conductive case plate 102 that is grounded, and a resonator 110 formed of a cylindrical conductor is arranged at each stage. A conductive lid (not shown) is fixed to the case 101 with a large number of screws. Further, connectors 104 for inputting and outputting a high-frequency signal to the coaxial bandpass filter F100 are provided at both ends of the side of the case 101. In this case, the connector 104 is fixed to the case plate 102 with screws via the connector fixing plate 107.

One end of a U-shaped coupling loop 112 is connected to the center conductor of the connector 104 by soldering, and the other end of the coupling loop 112 is connected to the connector fixing plate 107 by soldering. Further, a conductive resonator 110 is arranged so as to face the coupling loop 112, and the lower end of the resonator 110 is electrically connected to the case plate 102, and the resonator 110 is fixed. A cylindrical rotor conductor 118 is inserted from the upper end into the cylindrical resonator 110, and the rotor conductor 118 and the resonator 110 are arranged with a gap. The resonance frequency of the resonator 110 can be adjusted by moving the rotor conductor 118 up and down.

Furthermore, the signal resonated by the resonator 110 of the first stage 001 is coupled to the resonator 110 that constitutes the filter of the second stage 002 through the coupling window 105 formed in the shield plate. The second-stage filter includes the resonator 110 and the rotor conductor 118 that adjusts the resonance frequency of the resonator 110, as in the first-stage filter 001. In the filter of the second stage 002, the bandpass filter output is taken out from the connector 104 to which the coupling loop 112 electromagnetically coupled to the resonator 110 is connected.

The operation of the coaxial bandpass filter F100 will be described. A high frequency signal input from the connector 104 at the first stage 001 is input to the resonator 110 via the coupling loop 112. Then, only the signal of the frequency component in which the resonator 110 resonates in the input signal is extracted by the resonator 110, and the extracted signal is input to the filter of the second stage 002 through the coupling window 105. Then, also in the second stage 002, as in the case of the first stage 001, only the signal of the frequency component in which the resonator 110 resonates in the signal input in the resonator 110 is extracted and is output via the coupling loop 112 to the output side. It is output from the connector 104. Thereby, the high-frequency signal is filtered by the bandpass filter having two stages.

JP, 10-178303, A

As described above, the rotor conductor 118 is moved up and down to adjust the resonance frequency of the resonator 110, and the rotor conductor 118 is moved up and down by the adjusting screw lock mechanism 100. FIG. 16 is a side view showing the configuration of the adjusting screw lock mechanism 100 in a sectional view.
As shown in this figure, the cylindrical rotor conductor 118 is fixed to the tip of the rod-shaped rotation adjusting shaft 117, and the outer peripheral surface of the rotation adjusting shaft 117 is formed with a threaded portion 117b which is a male screw over the entire surface. There is. To the case plate 102, a disc-shaped bearing portion 111 having a female screw formed at the center is fixed. In this case, the side peripheral surface of the bearing portion 111, which has a step and has a slightly reduced diameter, is press-fitted into the through hole formed in the case plate 102 so as to be fixed. The rotor conductor 118 is arranged inside the case 101, and the rotation adjusting shaft 117 is screwed into the female screw of the bearing portion 111 so that the other end of the rotation adjusting shaft 117 is located outside the case plate 102. Further, in the bearing portion 111, two female screw portions into which the mounting screws 115 are screwed are formed so as to face each other around the female screw. A nut 113 is screwed onto the portion of the rotation adjusting shaft 117 located outside. An internal thread is formed in the central portion of the nut 113, and two insertion holes are formed facing each other around the internal thread. Then, the mounting screws 115 in which the washers 116 are fitted are inserted into the two insertion holes of the nut 113, and the two mounting screws 115 are respectively screwed into the female screw portions of the bearing portion 111.

When adjusting the resonance frequency of the resonator 110 by moving the rotor conductor 118 up and down, a slotted screwdriver is engaged with the groove 117a formed at the tip of the rotation adjusting shaft 117 to move the rotation adjusting shaft 117 in a desired direction. It will rotate. As a result, the rotor conductor 118 moves up and down according to the rotation direction of the rotation adjusting shaft 117. At this time, the tightening of the mounting screw 115 is adjusted to adjust the stress (indicated by a black arrow) from the bearing 111 and the nut 113 applied to the rotation adjusting shaft 117 as shown in FIG. The adjustment shaft 117 applies a predetermined rotational load capable of rotating. As a result, during the adjustment work, it is possible to adjust the rotation adjusting shaft 117 to a desired rotation position while a predetermined rotation load is applied to the rotation adjusting shaft 117. When the adjustment of the resonance frequency is completed, the rotation adjusting shaft 117 is locked in order to prevent the resonance frequency from shifting. To lock, the two mounting screws 115 are tightened to increase the stress applied to the rotation adjusting shaft 117 from the bearing 111 and the nut 113 as shown in FIG. As a result, the rotation adjusting shaft 117 is locked.

By the way, when the degree of perpendicularity of the rotation adjusting shaft 117 to the case plate 102 changes, the gap between the rotor conductor 118 and the resonator 110 slightly changes, so that the resonance frequency of the resonator 110 shifts. The vertical accuracy of the rotation adjusting shaft 117 with respect to the case plate 102 is governed by the inclination of the nut 113 directly screwed into the rotation adjusting shaft 17, and the inclination is large depending on the tightening balance of the two mounting screws 115. Change. However, when locking, the two mounting screws 115 cannot be tightened at the same time with the same tightening force, and normally, the mounting screws 115 are tightened one by one, so that the nut 113 tilts. Then, the verticality of the rotation adjustment shaft 117 changes. As a result, there is a problem that the resonance frequency of the resonator 110 shifts when locking.

Therefore, it is an object of the present invention to provide an adjusting screw locking mechanism that can prevent the electrical characteristics from shifting when locking the adjusting screw.

The adjusting screw locking mechanism of the present invention is fixed to a flat plate-like mounting plate, has a through hole in which a female screw is formed in the central portion, and forms a plurality of screw holes so as to face the periphery of the through hole. Bearing part and a rotor conductor for adjusting electrical characteristics are fixed to one end of the screw part, and the screw part is screwed into the female screw of the through hole, and the rotation adjusting shaft. An elastic body fitted to the rotation adjusting shaft, a polygonal nut screwed to the rotation adjusting shaft, a notch portion for engaging the nut so as not to rotate, a through hole inserted into the rotation adjusting shaft, A lock ring having a plurality of insertion holes formed so as to face each other around the through hole, and the lock ring is inserted into each of the plurality of insertion holes and screwed into the plurality of screw holes of the bearing portion. A mounting screw is provided, and the elastic body, the nut, and the locking ring are mounted in the threaded portion of the rotation adjusting shaft protruding from the bearing portion in this order without a gap, and the degree of compression of the elastic body is attached to the mounting portion. The most main feature is that the rotation adjustment shaft can be rotated or the rotation adjustment shaft can be locked depending on the tightening condition of the screw.
In the adjusting screw lock mechanism described above, the mounting plate is a case plate that constitutes a case of the filter, and the electrical characteristics of the filter are adjusted by rotating the rotation adjusting shaft to move the rotor conductor up and down. It may be done.

The adjustment screw locking mechanism of the present invention can adjust the degree of compression of the elastic body by the tightening degree of the mounting screw, and the rotation adjusting shaft can be rotated or locked by the tightening degree of the mounting screw. Can be As a result, when the tightening of the mounting screw is adjusted to adjust the position of the rotor conductor and then the tightening of the mounting screw is adjusted to the locked state, the repulsive force of the elastic body is uniformly applied to the nut. Even if the mounting screws are tightened one by one, the nut is held without tilting with respect to the rotation adjusting shaft. As a result, the verticality of the rotation adjusting shaft is maintained, and it is possible to prevent the electrical characteristics from shifting.

It is a figure which shows the structure of the filter provided with the screw lock mechanism for adjustment of the Example of this invention. It is a side view which shows the structure of the adjustment screw locking mechanism of the Example of this invention. It is a front view which shows the structure of the screw lock mechanism for adjustment of the Example of this invention. It is a rear view which shows the structure of the screw lock mechanism for adjustment of the Example of this invention. It is a side view showing the composition of the screw lock mechanism for adjustment of the example of the present invention in a sectional view. It is a side view showing the composition of the adjusting screw lock mechanism of the example of the present invention in an exploded view. It is a side view and a front view showing composition of a rotation adjustment axis in a screw lock mechanism for adjustment of an example of the present invention. It is the front view which shows the structure of the lock ring in the adjustment screw lock mechanism of the Example of this invention, a rear view, and the side view shown by a half cross-sectional view. It is a front view and a side view showing composition of a nut in a screw lock mechanism for adjustment of an example of the present invention. It is a front view showing the composition of the bearing part in the screw lock mechanism for adjustment of the example of the present invention, a rear view, and a side view shown in half section. It is the side view shown by the front view and sectional drawing which show the composition of the elastic body in the screw lock mechanism for adjustment of the example of the present invention. It is a side view shown with a sectional view showing a situation of repulsive force at the time of adjustment in an adjustment screw lock mechanism of an example of the present invention. FIG. 8 is a side view showing a cross-sectional view showing another repulsive force at the time of adjustment in the adjusting screw lock mechanism of the embodiment of the present invention. FIG. 8 is a side view showing a cross-sectional view showing another repulsive force at the time of adjustment in the adjusting screw lock mechanism of the embodiment of the present invention. It is a figure which shows the structure of the filter provided with the conventional screw lock mechanism for adjustment. It is a side view which shows the structure of the conventional adjustment screw locking mechanism in a cross-sectional view. It is a side view shown with a sectional view showing a situation of repulsive force at the time of adjustment in a screw lock mechanism for adjustment of a conventional example. It is a side view shown with a sectional view showing a situation of repulsive force at the time of adjustment in a screw lock mechanism for adjustment of a conventional example.

FIG. 1 shows the configuration of a coaxial bandpass filter F1 which is a filter including the adjusting screw lock mechanism 1 according to the embodiment of the present invention. In FIG. 1, the case 2 is shown in cross section, and the upper portion of the resonator 3 is cut away.
The coaxial bandpass filter F1 shown in FIG. 1 is configured by cascading two filters of a first stage 01 and a second stage 02, and the first stage 01 and the second stage 02 have the same configuration. ing. The coaxial bandpass filter F1 is housed in a box-shaped case 2 made of a conductive case plate 2a which is grounded, and a resonator 3 made of a cylindrical conductor is arranged at each stage. .. A conductive lid (not shown) is fixed to the case 2 with a large number of screws. Further, connectors 4 for inputting/outputting a high frequency signal to/from the coaxial bandpass filter F1 are provided at both ends of a side portion of the case 2. In this case, the connector 4 is fixed to the case plate 2a with screws via the connector fixing plate 7.

One end of a U-shaped coupling loop 6 is connected to the center conductor of the connector 4 by soldering, and the other end of the coupling loop 6 is connected to the connector fixing plate 7 by soldering. In addition, a conductive resonator 3 is arranged so as to face the coupling loop 6, and the lower end of the resonator 3 is electrically connected to the case plate 2a by soldering or brazing, so that the resonator 3 is a case. It is fixed inside 2. A cylindrical rotor conductor 18 is inserted from the upper end into the cylindrical resonator 3, and the rotor conductor 18 and the resonator 3 are arranged to face each other with a predetermined gap. By moving the rotor conductor 18 up and down, the capacitance component between the resonator 10 and the rotor conductor 18 is changed so that the resonance frequency can be adjusted.

Further, the signal resonated by the resonator 3 of the first stage 01 is coupled to the resonator 3 constituting the filter of the second stage 02 through the coupling window 5 formed on the shield plate. The filter in the second stage 02 is provided with the resonator 3 and the rotor conductor 18 for adjusting the resonance frequency of the resonator 3 as in the case of the first stage 01. In the filter of the second stage 02, the bandpass filter output is taken out from the connector 4 to which the coupling loop 6 electromagnetically coupled to the resonator 3 is connected.

The operation of the coaxial bandpass filter F1 will be described. The high frequency signal input from the connector 4 of the first stage 01 is input to the resonator 3 via the coupling loop 6. Then, only the signal of the frequency component in which the resonator 3 resonates in the input signal is extracted by the resonator 3, and the extracted signal is input to the filter of the second stage 02 via the coupling window 5. Then, in the second stage 02 as well as in the first stage 01, only the signal of the frequency component in which the resonator 3 resonates in the signal input in the resonator 3 is extracted, and is output via the coupling loop 6 to the output side. It is output from the connector 4. As a result, the high-frequency signal is filtered by the bandpass filter having two stages.
In the adjusting screw lock mechanism 1 of the embodiment of the present invention provided in the coaxial bandpass filter F1, the frequency of the coaxial bandpass filter F1 is changed by rotating the rotation adjusting shaft 17 and moving the rotor conductor 18 up and down. Can be adjusted. In this case, depending on the degree of tightening of the mounting screw 15, the rotation adjusting shaft 17 can be roughly adjusted in a freely rotating state, can be finely adjusted under a predetermined rotation load, and the rotation adjusting shaft 17 can be locked after the adjustment. be able to. The adjusting screw lock mechanism 1 according to the embodiment of the present invention will be described below.

The configuration of the adjusting screw lock mechanism 1 according to the embodiment of the present invention is shown in FIGS. Further, FIGS. 7 to 11 are component diagrams of components constituting the adjusting screw lock mechanism 1 according to the present invention. 2 is a side view showing the configuration of the adjusting screw lock mechanism 1 according to the present invention, FIG. 3 is a front view showing the configuration, FIG. 4 is a rear view showing the configuration, and FIG. 5 is an adjustment according to the present invention. FIG. 6 is a side view showing a cross-sectional view of the structure of the screw lock mechanism for use 1, and FIG. 6 is an exploded view showing the structure. 7A is a side view showing the configuration of the rotation adjusting shaft 17, FIG. 7B is a front view thereof, and FIG. 8A is a front view showing the configuration of the locking ring 14. 8B is a rear view thereof, FIG. 8C is a side view thereof showing a half sectional view thereof, FIG. 9A is a front view showing the configuration of the nut 13, and FIG. 9B is a side view thereof. Yes, FIG. 10(a) is a front view showing the structure of the bearing portion 11, FIG. 10(b) is a rear view thereof, and FIG. 10(c) is a side view showing a half sectional view thereof. Is a front view showing the structure of the elastic body 12, and FIG. 11(b) is a side view showing its cross-sectional view.

The structure of the adjusting screw lock mechanism 1 according to the present invention will be described. The case plate 2a, which is made of a flat metal and forms the case 2 of the coaxial bandpass filter F1, has the number of stages of the coaxial bandpass filter F1. The same number of bearing portions 11 as those in FIG. The bearing portion 11 is made of a disc-shaped metal, and as shown in FIGS. 10A, 10B, and 10C, a through hole 11c having a female screw is formed in the central portion, and the bearing portion 11 faces the periphery of the through hole 11c. So that two screw holes 11a are formed. Further, a stepped portion 11e is formed on the side peripheral surface of the bearing portion 11, and a flange portion 11b having a slightly larger outer diameter and a circular portion 11d having a slightly smaller outer diameter are formed. The case plate 2a is formed with an insertion hole that is slightly smaller than the outer diameter of the circular portion 11d. It is fixed.

A rotation adjusting shaft 17 is screwed into the through hole 11c of the bearing portion 11. As shown in FIGS. 7(a) and 7(b), the rotation adjusting shaft 17 has a rotor conductor 18 made of a cylindrical metal that is fixed to the tip, and a rod shape having a male screw formed over the entire outer peripheral surface. It is composed of a screw portion 17b made of metal. The screw portion 17b is screwed into the through hole 11c of the bearing portion 11 from the inside of the case plate 2a so that the rotor conductor 18 is located inside the case plate 2a. Further, an I-shaped groove portion 17a is formed on the other end surface of the rotation adjusting shaft 17, and the groove portion 17a serves as a groove for engaging a rotary tool such as a minus driver when the rotation adjusting shaft 17 is rotated. Has been done.

The elastic body 12 shown in FIGS. 11A and 11B is fitted and inserted into the threaded portion 17b protruding from the bearing portion 11 to the outside. The elastic body 12 is composed of a ring-shaped elastic body 12a made of rubber or resin having a ring shape having a circular cross section as shown in the drawing. Then, the nut 13 is screwed onto the threaded portion 17b so as to be on the elastic body 12. As shown in FIGS. 9A and 9B, the nut 13 is a hexagonal nut, and a threaded hole 13b having a female thread is formed at the center thereof. The threaded hole 13b is screwed into the threaded portion 17b of the rotation adjusting shaft 17. To be done. Further, the locking ring 14 is arranged on the nut 13. The locking ring 14 is made of a disc-shaped metal, and has a disc-shaped ring portion 14a as shown in FIGS. 8A, 8B, and 8C, and a threaded portion 17b is provided at the center of the ring portion 14a. A through hole 14b having a diameter that allows insertion is formed, and two insertion holes 14c are formed so as to face the periphery of the through hole 14b. Further, a cutout portion 14d having a width wider than the diameter of the through hole 14b is formed on the back surface of the ring portion 14a. The width of the cutout portion 14d is set so that the hexagonal nut 13 can engage with the cutout portion 14d and prevent the nut 13 from rotating. Further, the mounting screws 15 in which the washers 16 are fitted are respectively inserted into the two insertion holes 14c, and the mounting screws 15 are respectively screwed into the screw holes 11a of the bearing portion 11.

In the adjusting screw lock mechanism 1 of the embodiment of the present invention, the steps of moving the rotor conductor 18 up and down to adjust the frequency of the coaxial bandpass filter F1 include the following three steps.
In step 1, the nut 13 is screwed into the threaded portion 17b with a predetermined tightening. In this state, the through hole 14b of the locking ring 14 is inserted through the rotation adjusting shaft 17 and the notch 14d of the locking ring 14 is engaged with the nut 13 so as not to rotate. Next, the mounting screws 15 inserted into the two insertion holes 14c of the lock ring 14 are screwed into the two screw holes 11a of the bearing portion 11, respectively. When the two mounting screws 15 of the lock ring 14 are tightened, the nut 13 pressed by the lock ring 14 moves toward the elastic body 12 in accordance with the tightening. The state of this step 1 is shown in FIG. In this step 1, the mounting screw 15 of the locking ring 14 is tightened so that the slopes of the screw threads of the rotation adjusting shaft 17, the nut 13, and the bearing portion 11 do not contact each other. In step 1, stress is applied from the locking ring 14 to the elastic body 12 via the nut 13, and the elastic body 12 is compressed to generate a repulsive force indicated by a black arrow. This repulsive force balances the stress applied from the bearing portion 11 and the nut 13 to the elastic body 12 as indicated by the black arrow. As a result, the thread of the screw portion 17b of the rotation adjusting shaft 17 is located in the thread trough of the nut 13, and the thread of the screw portion 17b of the rotation adjusting shaft 17 is located in the thread trough of the through hole 11c of the bearing portion 11. Come to be located. Therefore, when the rotation adjusting shaft 17 is rotated by engaging the slotted screwdriver with the groove portion 17a, the rotation adjusting shaft 17 can be rotated in a free state in which a rotational load is not applied. As described above, in the process 1, since the rotation adjusting shaft 17 can freely rotate, the bearing portion 11 and the nut can be rotated when it is desired to temporarily release the rotation load in order to make the rotation adjusting shaft 17 to rotate many times by re-adjustment. It is possible to reduce the risk of wear and bite of the screw on the shaft 13 and the rotation adjusting shaft 17.

In step 2, the two mounting screws 15 of the lock ring 14 are further tightened from the state of step 1. The state of this step 2 is shown in FIG. In this step 2, the screw thread left slope of the nut 13 is pressed against the screw thread right slope of the screw portion 17b of the rotation adjusting shaft 17, and the screw thread right slope of the through hole 11c of the bearing portion 11 is changed to the rotation adjusting shaft. The mounting screw 15 of the locking ring 14 is tightened until it is pressed against the left slope of the thread of the threaded portion 17b of the thread 17. The state of this step 2 is shown in FIG. In step 2, since a larger stress than in step 1 is applied to the elastic body 12 from the lock ring 14 via the nut 13, the elastic body 12 is compressed in step 1 and the repulsive force indicated by a black arrow is greater than that in step 1. It becomes larger and is balanced with the stress applied to the elastic body 12 from the bearing portion 11 and the nut 13 which is larger than that in the step 1 indicated by the black arrow. As a result, when an attempt is made to rotate the rotation adjusting shaft 17 by engaging a slotted screwdriver in the groove portion 17a, the screw thread 17b of the rotation adjusting shaft 17 is rubbed against the right slope of the screw thread and the left slope of the screw thread of the nut 13. While rotating, the right slope of the screw thread of the through hole 11c of the bearing 11 and the left slope of the screw thread of the screw portion 17b of the rotation adjusting shaft 17 rub against each other and rotate. That is, the rotation adjusting shaft 17 can be rotated under a predetermined rotation load, and the insertion length g can be finely adjusted to a desired length.

In step 3, the two mounting screws 15 of the lock ring 14 are tightened further than in step 2. In this step 3, the left slope of the thread of the nut 13 is strongly pressed against the right slope of the thread of the screw portion 17b of the rotation adjusting shaft 17, and the right slope of the screw thread of the through hole 11c of the bearing 11 is adjusted for rotation. The mounting screw 15 of the locking ring 14 is tightened until it is strongly pressed against the left slope of the thread of the threaded portion 17b of the shaft 17. The state of this step 3 is shown in FIG. In step 3, since a larger stress than in step 2 is applied from the locking ring 14 to the elastic body 12 via the nut 13, the elastic body 12 is compressed in step 2 and the repulsive force indicated by the black arrow is greater than in step 2. It becomes larger, and the stress applied to the elastic body 12 from the bearing portion 11 and the nut 13 is larger than that in the step 2 indicated by the black arrow. As a result, when an attempt is made to rotate the rotation adjusting shaft 17 by engaging a slotted screwdriver in the groove portion 17a, the screw thread right slope of the screw portion 17b of the rotation adjusting shaft 17 and the screw thread left slope of the nut 13 become strong. At the same time as rubbing, the right slope of the thread of the through hole 11c of the bearing 11 and the left slope of the thread of the screw 17b of the rotation adjusting shaft 17 are strongly rubbed, and a large rotational load is applied to the rotation adjusting shaft 17. Get locked.
In steps 1 to 3 described above, since the repulsive force of the elastic body 12 is evenly applied to the nuts 13, even if the mounting screws 15 are tightened one by one, the nuts 13 are held without tilting with respect to the rotation adjusting shaft 17. To be done. Therefore, the verticality of the rotation adjusting shaft 17 with respect to the case plate 2a can be prevented from changing, and the rotation adjusting shaft 17 can be locked so as not to rotate, and the adjustment time can be shortened and mass production with stable quality becomes possible. ..

The adjusting screw lock mechanism according to the embodiment of the present invention described above is fixed to a case plate that is a flat plate-like mounting plate, a through hole having a female screw is formed in the central portion, and the through hole is formed. A bearing portion having a plurality of screw holes formed so as to face each other around the rotor and a rotor conductor for adjusting electrical characteristics are fixed to one end of the screw portion, and the screw portion is screwed into the female screw of the through hole. A rotation adjusting shaft, an elastic body fitted to the rotation adjusting shaft, a polygonal nut screwed to the rotation adjusting shaft, a notch portion for engaging the nut so as not to rotate, A through hole inserted into the rotation adjusting shaft, a lock ring in which a plurality of insertion holes are formed so as to face the periphery of the through hole, and a plurality of insertion holes of the lock ring are respectively inserted, And a mounting screw screwed into a plurality of screw holes of the bearing portion. Then, the elastic body, the nut, and the lock ring are attached in this order to the threaded portion of the rotation adjusting shaft protruding from the bearing portion on the opposite side of the rotor conductor, and the stress applied to the elastic body is applied. Since the stress depends on the tightening degree of the mounting screw, the degree of compression of the elastic body can be adjusted by the tightening degree of the mounting screw, and the rotation adjusting shaft can be rotated by the tightening degree of the mounting screw. Alternatively, the rotation adjusting shaft can be locked.

In the above description, the case plate in the adjusting screw locking mechanism according to the present invention and each component constituting the adjusting screw locking mechanism are preferably made of metal using a metal made of copper. It may be made of metal plated with good silver or the like. The shape of the rotor conductor may be a shape other than the illustrated cylindrical shape, for example, a disk shape, depending on the purpose. Further, the rotation adjusting shaft and the rotor conductor may be integrated, or the rotation adjusting shaft may be screwed and fixed to a screw hole formed in the rotor conductor. Further, although the head of the nut is hexagonal, the present invention is not limited to this and may be an even polygon such as a quadrangle or an octagon or an oval shape in which opposite surfaces are chamfered from a circle. If the shape of the head of the nut is changed, the shape of the notch of the lock ring should be changed accordingly. Furthermore, although the outer shape of the elastic body is basically circular, another shape may be used as long as the required function can be maintained. The elastic material suitable for the elastic body is synthetic rubber typified by silicon, nitrile, etc., but a metal toothed washer may be used. Further, although the number of mounting screws is two, the number of mounting screws is not limited to this, and the number of screws can be three or more as required. In this case, the number of screw holes corresponding to the number of mounting screws is formed in the bearing portion, and the number of insertion holes corresponding to the number of mounting screws is formed in the lock ring. When changing the number of mounting screws, change the number of insertion holes of the lock ring and the number of screw holes of the bearing according to the number of mounting screws.
The adjusting screw locking mechanism according to the present invention can be applied to the coaxial bandpass filter as described above, but is not limited to the coaxial bandpass filter, and can be applied to general filters and electronic circuit devices including adjusting screws. Can be applied. The filter to which the adjusting screw lock mechanism according to the present invention is applied is preferably a VHF band or UHF band filter.

In the adjusting screw lock mechanism according to the present invention described above, when the insertion length g is finely adjusted to a desired length, the fine adjustment can be performed as follows.
First, the nut 13 is screwed into the threaded portion 17b with a predetermined tightening. As a result, a stress in the direction of compression is applied to the elastic body 12 fitted between the bearing portion 11 and the nut 13, and as a result, the elastic body 12 is compressed and a repulsive force is generated in the elastic body 12. .. This repulsive force becomes a stress that pushes the bearing portion 11 and the nut 13 away from the elastic body 12, so that the right slope of the screw thread of the nut 13 is the left slope of the screw thread of the screw portion 17b of the rotation adjusting shaft 17. In addition, the screw thread left slope of the through hole 11c of the bearing portion 11 is pressed against the screw thread right slope of the screw portion 17b of the rotation adjusting shaft 17. In this state, the through hole 14b of the locking ring 14 is inserted through the rotation adjusting shaft 17 and the notch 14d of the locking ring 14 is engaged with the nut 13 so as not to rotate. Next, the mounting screws 15 inserted into the two insertion holes 14c of the lock ring 14 are screwed into the two screw holes 11a of the bearing portion 11, respectively. Here, the two mounting screws 15 of the locking ring 14 are not tightened. When the rotation adjusting shaft 17 is rotated by engaging a slotted screwdriver in the groove portion 17a, the screw thread right slope of the nut 13 is rubbed against the screw thread left slope surface of the screw portion 17b of the rotation adjusting shaft 17 to rotate. At the same time, the screw thread left slope of the through hole 11c of the bearing portion 11 rubs against the screw thread right slope of the screw portion 17b of the rotation adjusting shaft 17 to rotate. That is, the rotation adjusting shaft 17 can be rotated under a predetermined rotation load, and the insertion length g can be finely adjusted to a desired length.

1 adjusting screw locking mechanism, 2 case, 2a case plate, 3 resonator, 4 connector, 5 coupling window, 6 coupling loop, 10 resonator, 11 bearing section, 11a hole, 11b collar section, 11c through hole, 11d circular shape Part, 11e step part, 12 elastic body, 12a ring-shaped elastic body, 13 nut, 13b screw hole, 14 lock ring, 14a ring part, 14b through hole, 14c insertion hole, 14d notch part, 16 washer, 17 rotation adjustment Shaft, 17a Groove, 17b Screw, 18 Rotor conductor, 100 Adjustment screw lock mechanism, 101 Case, 102 Case plate, 104 Connector, 105 Coupling window, 110 Resonator, 111 Bearing, 112 Coupling loop, 113 Nut, 116 Washer 117 Rotation adjustment shaft 117a Groove portion 117b Screw portion 118 Rotor conductor 120 Resonator F1, F100 Coaxial bandpass filter

Claims (2)

A bearing portion which is fixed to a flat plate-shaped mounting plate and has a through hole in which a female screw is formed in the central portion, and a plurality of screw holes are formed so as to face the periphery of the through hole.
A rotor conductor for adjusting electrical characteristics is fixed to one end of a screw portion, and the screw portion is screwed into a female screw of the through hole, and a rotation adjusting shaft,
An elastic body fitted on the rotation adjusting shaft;
A polygonal nut screwed to the rotation adjusting shaft,
A cutout portion that engages so that the nut does not rotate, a through hole that is inserted into the rotation adjusting shaft, and a locking ring in which a plurality of insertion holes are formed so as to face the periphery of the through hole.
A mounting screw that is inserted into each of the plurality of insertion holes of the lock ring and is screwed into the plurality of screw holes of the bearing portion,
The elastic body, the nut, and the lock ring are mounted in this order on the threaded portion of the rotation adjusting shaft protruding from the bearing portion, and the degree of compression of the elastic body is adjusted by the degree of tightening of the mounting screw. The adjustment screw is characterized in that the rotation adjusting shaft can be freely rotated according to the degree of tightening of the mounting screw, can be rotated under a predetermined rotation load, and the rotation adjusting shaft can be locked. Lock mechanism. 2. The filter according to claim 1, wherein the mounting plate is a case plate constituting a case of the filter, and the electric characteristic of the filter is adjusted by rotating the rotation adjusting shaft to move the rotor conductor up and down. Adjustment screw lock mechanism described.

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