JPH04347906A - Dielectric filter and its production - Google Patents

Abstract

PURPOSE:To shorten the assembling time of a dielectric filter, to prevent the occurrence of a failure of assembling, and to automatically assemble it by a machine by developing the method which simultaneously stores plural dielectric resonators in a case. CONSTITUTION:Cases 1 and 10, plural dielectric resonators 7a, 7b, 7c, 7d, and 7e arranged in parallel in cases 1 and 10, and a coupling part 9 which electrically couples these dielectric resonators are provided. Plural dielectric resonators are fixed by an adhesive 8 so that two or more of them are brought into contact with outer peripheral parts of each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter in which a plurality of dielectric resonators are housed in one case, and a method for manufacturing the same.

0002

[Prior Art] A dielectric filter includes a device in which a plurality of resonant holes are formed in one relatively large dielectric block to form a plurality of resonators, and these are coupled by coupling holes between the resonant holes. There is a block type dielectric filter.

On the other hand, in another type of resonator, one resonator hole is formed in the center of one cylindrical or quadrangular prism dielectric, and a large number of resonators are arranged and connected to an external dielectric substrate. There is a so-called discrete type dielectric filter that is formed by combining two types of filters. In the former monoblock type dielectric filter, since it is a single block, it can be easily housed in a metal case for attaching the filter to a wiring board.

However, in the latter discrete type dielectric filter, not only a dielectric substrate for coupling is housed in a single case, but also a plurality of separated resonators are housed in a predetermined position within the case. It was necessary to place the dielectric substrate at the location and then electrically connect it to the dielectric substrate.

[0005]

[Problems to be Solved by the Invention] As described above, in conventional discrete type dielectric filters, the independent dielectric resonators were arranged and electrically connected one by one in the case, which made the storage work and soldering difficult. The work had to be repeated many times, which took a lot of time.

[0006] Furthermore, each dielectric resonator has a slightly different length in order to adjust the required oscillation frequency, and when identifying these resonators and storing them in a predetermined location in the case, it is difficult to arrange the resonators. Mistakes, so-called misprints, were likely to occur. Furthermore, the work of housing small dielectric resonators one by one in a case is difficult to assemble automatically using a machine in terms of work precision, and often relies on manual work with poor work efficiency.

The present invention has been made to solve the above-mentioned problems, and aims to provide a dielectric filter and a method for manufacturing the same, which can shorten working time, prevent typographical errors, and facilitate automatic assembly by machine.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the dielectric filter of the present invention includes a case, a plurality of dielectric resonators arranged in parallel within the case, and an electrical connection between the dielectric resonators. The dielectric filter is characterized in that two or more of the plurality of dielectric resonators are fixed by a fixing member so as to be in contact with each other at their outer peripheries.

Furthermore, in the method for manufacturing a dielectric filter of the present invention, a plurality of dielectric resonators, which have been temporarily fixed to each other by fixing members in advance so that their outer circumferences are in contact with each other, are placed inside the case at once. The device is characterized by being housed in the device and fixed by soldering.

0010

[Function] In the present invention, before storing multiple dielectric resonators in a case, they are temporarily fixed to each other using fixing members, which shortens the storage time, prevents typographical errors, and facilitates automatic assembly by machine. become.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a dielectric filter in one embodiment of the present invention. 2, 3 and 4 are perspective views showing the steps of assembling the same filter. Based on these figures, the structure and manufacturing method of the dielectric filter of this example will be explained according to its assembly process.

(1) First, the lower metal case 1 made by drilling and bending a metal plate is fixed to a jig (not shown). This metal case houses and protects the dielectric filter, and serves as a means for electrically and mechanically connecting it to the printed wiring board. (2) Next, as shown in FIG. 2, the spacer 2, the input/output terminals 3a and 3b, and the coupling dielectric substrate 4 are attached to the end side of the lower metal case 1 fixed by a jig (not shown). A coupling circuit assembly 6 is housed therein. Here, the coupling circuit assembly 6 is prepared by electrically and mechanically connecting the spacer 2, the input terminals 3a, 3b, and the coupling dielectric substrate 4 to each other by reflow soldering.

[0013] Here, the spacer 2 has an electrode formed on its upper surface that contacts the input/output terminals 3a, 3b, and its role is to align the heights of the input/output terminals 3a, 3b and maintain insulation at a predetermined portion. It is something. In addition, input/output terminals 3a and 3b
is an input/output section for high-frequency signals, and is made by bending a tanzag-shaped metal plate.

Further, the coupling dielectric substrate 4 has electrodes formed on its upper and lower surfaces to form a capacitance via the dielectric substrate, and this formed capacitance is connected to a dielectric resonator described below. and input/output terminals 3a, 3
It serves as a capacitive connection between the dielectric resonator and the dielectric resonator.

(3) After the coupling circuit assembly 6 configured as described above is housed in the lower metal case 1, as shown in FIG.
As shown in the figure, dielectric resonators 7a, 7b, 7c, 7d, and 7e are housed in a lower metal case 1. Each of the dielectric resonators 7a, 7b, 7c, 7d, and 7e has one through hole, and the entire surface is made of a conductor except for the inside of the through hole and a portion of the end surface on the side where the connecting pin 9 is inserted. covered with a membrane (not shown). Further, the connecting pin 9 is fixed in the through hole of the dielectric resonators 7a, 7b, 7c, 7d, and 7e with one end electrically connected to the conductive film in the through hole.

Here, all of the dielectric resonators 7a to 7e are temporarily fixed in advance with an adhesive 8, and are integrated with their outer surfaces in contact with each other. During this temporary fixing, adjustment is made so that the end face on the side where the connecting pin 9 is inserted, that is, the open face, is aligned on one plane. Note that while the dielectric resonator is temporarily fixed in this manner, the surface trimming of the dielectric resonator for frequency adjustment has already been completed.

In this way, the temporarily fixed dielectric resonator 7
a to 7e are housed together in the lower metal case 1 manually or by vacuum suction means of an automated machine, and the connecting pins 9 come into contact with each electrode on the upper surface of the coupling dielectric substrate 4.

(4) Next, as shown in FIG. 4, the coupling circuit assembly 6, the dielectric resonators 7a, 7b, 7c, 7d, and 7e, and the connecting pins 9 are reflow soldered to predetermined portions, respectively. This reflow soldering is usually performed by applying paste-like solder to a predetermined portion and passing it through a high-temperature furnace. Note that the upper metal case 10 is finally combined and fixed with the lower metal case 1.

The dielectric filter assembled through the above manufacturing process has the structure shown in FIG. That is, the dielectric filter of this embodiment includes a case consisting of a lower metal case 1 and an upper metal case 10 having a storage section inside, and a coupling dielectric substrate 4 housed in the case and having an electrode film on its surface. It has a conductor film in one through hole formed in the center, and has a plurality of dielectric resonators 7a, 7b, 7c, 7d, and 7e arranged in parallel within this case. Furthermore, dielectric resonators 7a, 7b, 7c, 7d, 7
A connecting pin 9 is provided to electrically connect the conductive film in the through hole e and the electrode film on the surface of the dielectric substrate. A feature of this dielectric filter is that all of the plurality of dielectric block resonators 7a, 7b, 7c, 7d, and 7e are fixed with adhesive 8 so as to be in contact with each other at their outer peripheries. .

Next, based on FIGS. 5 to 8, the structure and manufacturing method of another embodiment in which some of the block resonators among the dielectric block resonators are temporarily fixed will be explained according to the assembly process. explain. Note that FIGS. 5 to 8 correspond to FIGS. 1 to 4, respectively.

(1) First, the lower metal case 1 made by drilling and bending a metal plate is fixed to a jig (not shown). This metal case houses and protects the dielectric filter, and serves as a means for electrically and mechanically connecting it to the printed wiring board. (2) Next, as shown in FIG. 6, a spacer 2, input/output terminals 3a and 3b, and a coupling dielectric substrate 4 are attached to the end side of the lower metal case 1 fixed by a jig (not shown). A coupling circuit assembly 6 comprising a coupling coil 5 is housed. Here, the coupling circuit assembly 6 is made by electrically and mechanically connecting the spacer 2, the input terminals 3a, 3b, the coupling dielectric substrate 4, and the coupling coil 5 to each other by reflow soldering. be.

Note that the coupling coil 5 may not be attached in this step, but may be soldered to the coupling dielectric substrate 4 together with the dielectric resonator in a later step.

Here, the spacer 2 has an electrode formed on its upper surface that contacts the input/output terminals 3a, 3b, and its role is to align the heights of the input/output terminals 3a, 3b and maintain insulation at a predetermined portion. It is something. In addition, input/output terminals 3a and 3b
is an input/output section for high-frequency signals, and is made by bending a tanzag-shaped metal plate.

Further, the coupling dielectric substrate 4 has electrodes formed on its upper and lower surfaces to form a capacitance via the dielectric substrate, and this formed capacitance is connected to a dielectric resonator described below. and input/output terminals 3a, 3
It serves as a capacitive connection between the dielectric resonator and the dielectric resonator.

The coupling coil 5 inductively couples the dielectric block resonators, and both terminals thereof are soldered to adjacent electrodes on the coupling dielectric substrate 4.

(3) After the coupling circuit assembly 6 configured as described above is housed in the lower metal case 1, as shown in FIG.
Dielectric resonators 7a, 7b, 7c and 7d as shown in
is stored in the lower metal case 1. This dielectric resonator 7a
, 7b, 7c, and 7d each have one through hole, and the entire surface except for the inside of the through hole and a portion of the end surface on the side where the connecting pin 9 is inserted is covered with a conductive film (not shown).
covered with. Further, the connecting pin 9 is fixed in the through hole of the dielectric resonators 7a, 7b, 7c, and 7d with one end electrically connected to the conductive film in the through hole.

Here, the dielectric resonators 7a, 7b, and 7c are temporarily fixed in advance with an adhesive 8, and are integrated with their outer surfaces in contact with each other. During this temporary fixing, adjustment is made so that the end face on the side where the connecting pin 9 is inserted, that is, the open face, is aligned on one plane. Therefore, the short side of the dielectric resonator 7b, which is longer than the others in order to obtain a predetermined resonance frequency, protrudes. Note that while the dielectric resonator is temporarily fixed in this manner, the surface trimming of the dielectric resonator for frequency adjustment has already been completed.

In this way, the temporarily fixed dielectric resonator 7
a, 7b and 7c are housed together in the lower metal case 1 manually or by vacuum suction means of an automated machine, and the connecting pins 9 are brought into contact with each electrode on the upper surface of the coupling dielectric substrate 4. .

Note that the dielectric resonator 7d is housed singly in a predetermined location of the lower metal case 1.

(4) Next, as shown in FIG. 8, the coupling circuit assembly 6 and the dielectric resonators 7a, 7b, 7c and 7
d and the connecting pin 9 are reflow soldered to respective predetermined portions. This reflow soldering is usually performed by applying paste-like solder to a predetermined portion and passing it through a high-temperature furnace. Note that the upper metal case 10 is finally combined and fixed with the lower metal case 1.

The dielectric filter assembled through the above manufacturing process has the structure shown in FIG. That is, the dielectric filter of this embodiment includes a case consisting of a lower metal case 1 and an upper metal case 10 having a storage section inside, and a coupling dielectric substrate 4 housed in the case and having an electrode film on its surface. It has a conductor film in one through hole formed in the center, and has a plurality of dielectric resonators 7a, 7b, 7c, and 7d arranged in parallel within this case. Furthermore, connection pins 9 are provided to electrically connect the conductor films in the through holes of the dielectric resonators 7a, 7b, 7c, and 7d and the electrode films on the surface of the dielectric substrate. A feature of this dielectric filter is that among the plurality of dielectric block resonators 7a, 7b, and 7c are fixed with an adhesive 8 so that their outer peripheral portions are in contact with each other.

As described above, when assembling a dielectric filter, conventionally it was necessary to repeatedly house the dielectric resonators in the case and solder them once, but in this embodiment, once By temporarily fixing the dielectric resonator with adhesive, there is less storage work involved, and soldering can be done all at once at the final stage, reducing work time. Also, 1
When storing dielectric resonators one by one in a case, misprints were likely to occur, but by correctly temporarily fixing them and storing them all at once, the frequency of misprints can be reduced.

Furthermore, by integrating the dielectric resonator,
The vacuum suction means of the automatic assembly machine facilitates handling, and by integrating non-directional dielectric blocks, directionality can be achieved, which facilitates automatic feeding by automatic machines.

Here, the dielectric resonators 7a, 7b, 7c,
Temporarily fixing all or two or more adjacent pieces of 7d and 7e can be done by using adhesive 8, or by: 1) Applying silver to the contact surface between dielectric resonators and firing 2) String or band 3) A method of temporarily fixing a plurality of dielectric resonators by tying them together, etc. 3) A method of temporarily fixing a plurality of dielectric resonators by housing them in a heat-shrink tube may be used.

[0035]

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, when manufacturing a dielectric filter, assembly time can be shortened, assembly errors can be prevented, and automatic assembly by a machine can be facilitated. The effect is produced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a dielectric filter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing one step in manufacturing the same filter.

FIG. 3 is a perspective view showing one step in manufacturing the same filter.

FIG. 4 is a perspective view of the completed filter.

FIG. 5 is an exploded perspective view of a dielectric filter according to another embodiment of the present invention.

FIG. 6 is a perspective view showing one step of manufacturing the same filter according to another example.

FIG. 7 is a perspective view showing one step of manufacturing the same filter according to another example.

FIG. 8 is a perspective view of the completed filter according to another example.

[Explanation of symbols]

1, 10 Case 4 Dielectric substrate (dielectric substrate for coupling) 7a, 7b, 7
c, 7d, 7e dielectric resonator 9 conductive connection member (
joint)

Claims (2)

[Claims] 1. A dielectric filter comprising: a case; a plurality of dielectric resonators arranged in parallel within the case; and a coupling portion that electrically couples the dielectric resonators. A dielectric filter characterized in that two or more body resonators are fixed by a fixing member so as to be in contact with each other at their outer peripheries. 2. A plurality of dielectric resonators, which have been temporarily fixed to each other with fixing members in advance so that their outer peripheral parts are in contact with each other, are housed in the case at once and fixed by soldering. A method for manufacturing a featured dielectric filter.