JPS603204A - Assembling method of high frequency filter device - Google Patents

Abstract

PURPOSE:To attain ease of the assembling work and to improve the high frequency characteristic by assembling an inductor before the assembling of a coupling element. CONSTITUTION:A variable capacitor 21 is fitted to a variable capacitor fitting part 5 of a base plate 1. Then a supporting part 25b of the inductor 25 is soldered while being passed through the fitting part 6 and also one end of an inductor main body 25a is soldered to a connecting terminal 23. Then preassembled cavities 10, 10 are assembled. This assembling is conducted by inserting each fitting piece 19 through each square hole 8 and soldering its tip to a conductor foil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency filter device that handles high frequency signals such as UHF, and more specifically, a high frequency filter comprising a substrate, a cavity, and an internal conductor element provided in each cavity. The present invention relates to a method of assembling a high frequency filter device comprising:

In the conventional method of assembling a high frequency filter device, a cavity is attached to a substrate, an inductor is built into the narrow internal space of the cavity, and coupling elements are also built into the narrow internal space on both sides of the inductor. The conventional method has the disadvantage that the work is difficult because it requires very detailed work, and the high-frequency characteristics of the products produced by such work deviate from the predetermined ones. there were.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a method for assembling a high frequency filter device which is easy to assemble and has good high frequency characteristics.

The drawings showing the embodiments of the present application will be described below.

In FIGS. 1 to 8, a high frequency filter device A consists of a substrate 1 and a high frequency filter (bandpass filter) B attached to the substrate. The substrate 1 is formed by pasting conductor foils (copper foils) 3 and 4 on the surface and the mounting surface of an insulating plate 2, respectively. These conductor foils 3.4 form the ground conductor. Note that this substrate 1 may be formed of a metal plate with good conductivity such as a copper plate or an iron plate. In the substrate 1, 5 is a capacitor fixing member, and 6 is an inductor fixing member, each of which has a through hole. Reference numeral 7 denotes a cavity stopper part, which has a plurality of square holes 8. Next, in the high frequency filter B, 10 and 10 respectively indicate cavities, and in this embodiment, there are three side plates (1) made of metal plates with good conductivity, such as copper plates or iron plates plated with copper. The two cavities 10, 10 are integrally formed by assembling the two end plates as shown and soldering them together. (The middle side plate U is used for both cavities 10 and 10.) In the above side plate ■ and the end plate, (L3 is a fitting part, 14 is a fitting piece, and these are used to assemble the side plate 11 and the end plate ν. This is provided to ensure that the mutual positional relationship matches the specified alignment when mating. 6 is the support plate attachment part, and the side plate ■
), and a screw hole 16 is bored therein. Reference numeral 17 denotes a cutout, and its lower edge 17a is formed to be lower than the height of the mounting portion 15 so that a supporting plate, which will be described later, does not come into contact with it. The slide is a piece of material for fixing the lid, and the base IBa is formed to be thin as shown in the figure. 19 indicates a stopper piece. Next, the members provided inside the cavity 10 will be explained. Reference numeral 4 denotes a variable capacitor, which has a grounding terminal η and an inductor connecting terminal, and the grounding terminal ρ is fixed to the board 1 with a set screw rod.

The threaded rod U is made of a conductive material (metal) so that the ground terminal 4 and the conductive foil 4 on the back surface of the substrate 1 are electrically connected to each other by the screw rod U. Reference numeral 5 denotes an inductor, which is composed of a main body 25a and a support portion 25b. The support portion 25b has the role of mechanically fixing the main body 25a to the substrate l and the role of electrically connecting one end of the main body δa to the ground conductor (conductor foil 4) of the substrate 1. The support part δblf has a positioning member so that the main body 25a of the inductor 5 is located at a predetermined height from the board 1 when the lower end of the support part 3b is attached to the board 1. It is. Next is the support plate, which is made of a conductor foil (copper foil) pasted on one side of the insulating plate (referred to as a printed circuit board). In this supporting plate road, the field is inside the cavity, and is exactly at the cavity 10.
, 10, and has dimensions corresponding to the inner dimensions of the cavity 10. 31 is a notch portion, 32 is a terminal portion, and the brim is a large through hole for inserting a set screw rod. The adjustment hole is formed at a position that overlaps the rotation axis of the variable capacitor 210 in projection.

Next, in the various conductors formed by printing wiring means (etching means) on the conductor foil, 35 is a ground part, 36 is a terminal, one is an input terminal, and the other is an output terminal. used. The wire is the connecting conductor.

The numerals 39 and 39 each represent a coupling element, one end of which is connected to a grounding section, and the other end connected to a terminal section or a connecting conductor a. Next, the chrysanthemum is a trimmer capacitor for adjustment, which is connected between all four connections and the back of the ground section. Reference numeral 41 denotes a lid, which is formed by pressing a material with good conductivity (for example, a copper plate), and is used for inserting an adjustment rod at a location where it overlaps the shaft of the variable capacitor 4 and the shaft of the trimmer capacitor 4 in a projection manner. It has a through hole C043, and also has a through hole for a stopper. Note that this lid d is designed to shield the interior space of the cavity 10.

Next, the procedure for assembling the above structure will be explained.

First, as shown in FIG.
Attach the variable capacitor 21 to with a set screw rod. Next, the support part 25b of the inductor device is inserted through the stopper part 6 to connect the ground conductor 4.
At the same time, one end of the inductor body 25a is soldered to the connection terminal. Note that the support portion 25b may be soldered to the ground conductor 3 on the surface of the board, or both may be soldered to 3.degree. 4.

Next, the cavities 10, which have been assembled in advance as shown in FIG. 4, are assembled. This assembly is carried out by inserting each stopper piece I9 into each square hole 8 and soldering its tip to the conductor foil 4.

Incidentally, the fixing of the cavity 10 may be performed before the capacitor 4 and the inductor 25 are assembled.

Next, the support plate A to which the trimmer capacitor chrysanthemum was attached in advance is placed inside the cavity, J, aO are each cavity 10,
10 so that their edges rest on the mounting part, and insert the retaining threaded rod into the screw hole 1 through the through-hole field.
6 to integrally fix the support Iida to the cavity 10. As a result, the grounding section becomes electrically connected to the cavity 10 (at the same potential) via the mounting section.

Further, as shown in FIG. 3, the coupling elements 39 in each cavity 10 are arranged side by side on both sides of the inductor section in a designed positional relationship.

Next, the lid 41 is placed on the lid 41 so that the stopper piece passes through the hole, and the lid d is fixed to the cavity 10 by screwing and deforming the portion of the stopper piece that protrudes from the hole blade.

The filter device A is completed by the above operations.

In the above configuration K, a high frequency signal (
For example, a UHF television signal) is transmitted within one cavity 10 to a coupling element connected to the terminal portion thereof, and further transmitted to the coupling element through well-known electrical connections between the members within the cavity 10. Further, the signal is transmitted through the connecting conductor J to the coupling element in the other cavity 10, through the well-known electrical coupling of the members in that cavity 10 to the coupling element, and through there to the coupling element in the other terminal (
output terminal). In this way, a well-known filtering effect is performed during the process in which the above-mentioned signal passes through the high-frequency filter B, and even if there are many signals input to the filter B, only the signals in a predetermined band among them are sent to the output terminal. appears in

Next, FIG. 9, which shows a different embodiment of the present application, will be described. This figure shows an example in which the support plate 2Be is further provided with other circuit conductors. In the figure, support plate 281
3 is formed by providing conductor foil on both the front and back surfaces of an insulating plate 29e. The conductor foil on the back side has a conductor of type 4 similar to the previous example, while the conductor foil on the front side has a ground portion 6.
．． 45 and a coupling degree adjusting element 46 are formed. The degree of coupling adjustment element 46 has a shape of 1 at a position where it overlaps the inductor in projection when the support plate 28e is attached to the cavity.

When the device having the above configuration is installed in the cavity and used, it exhibits the characteristics shown by the two-dot chain line in FIG. 10 and can widen the band. A filter with such characteristics is conveniently used as a bandpass filter that passes a plurality of channels. In addition, when the adjustment element weak and the ground part 6 are connected by soldering at the positions indicated by 47, 47, etc. in the above-mentioned state of use, the characteristic shown by the solid line in Fig. 1O is exhibited and the band is narrowed. can do. A filter with such characteristics is conveniently used as a bandpass filter that passes a single channel.

The adjustment element chestnut may be formed with both ends connected to the ground portions 6, 45, and the connected portions may be cut with a knife or the like, if desired.

It should be noted that parts that are functionally the same or equivalent to those in the previous figure are given the same reference numerals with the letter e and redundant explanations are omitted. (The same concept will be used in the next version as well, and the redundant explanation will be omitted.) Next, FIG. 11 shows a further different embodiment of the present application.
This is an example of a filter device in which a large number of filters are arranged in parallel.

As described above, in this invention, (a) When assembling the inductor 5 during assembly, it is done before assembling the coupling element device 39, so that the inductor 5 can be assembled alone. It has the effect of being easy to assemble (because there is no need to mount the connecting elements side by side on both sides) and workability is very good (much easier than installing 3 pieces side by side).

Similarly, regarding the assembly of the cavity 10, there is an effect that the assembly can be easily performed by the cavity alone.

(c) Further, in the ridge 11 that fixes the inductor 6 and the cavity 10 to the substrate 1, the cavity lO and the inductor δ can be positioned centering on the substrate 1, and their mutual positional relationship is set as planned in the design. There are features that allow you to

In addition, when the two coupling elements 38 and 39 are assembled so that they are positioned one inch each on both sides of the inductor 6, the coupling elements 38 and 39 are arranged so that the positional relationship with the cavity 10 is determined in advance. Since the support plate is formed with a printed wiring means, the support plate is simply attached to the mounting portion provided in the cavity 10, and both connecting elements 38 are connected.
．． 39 can be completed in a predetermined position, and there is also an effect that the assembling work can be performed extremely easily.

Even if the assembly is performed individually as described above, in the assembled state, the cavity 10 and the inductor 5, the cavity 10 and both coupling elements 38 and 31, and the inductor and both couplings are connected as described above. The positional relationship between elements 0 and 3g is determined, and there is an effect that the designed high frequency characteristics can be obtained correctly.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along line I-1, FIG. 3 is a sectional view taken along line I-1, and FIG.
The figure is a perspective view showing the state before the cavity is assembled.
The figure is a perspective view showing the state before the support plate is assembled, Figure 6 is a back view of the support plate, Figure 7 is a three-dimensional circuit diagram, Figure 8 is an exploded perspective view of the cavity, and Figure 9 is a view of the support plate. FIG. 10 is a perspective view showing a different example, FIG. 10 is a characteristic diagram, and FIG. 11 is a diagram of a multi-connected filter device in which only the support plates are separated so that the internal structure can be seen. DESCRIPTION OF SYMBOLS 1...Substrate, 10...Cavity, 5...Inductor, A...Support plate, holder, 39...Coupling element. Figure 1 Figure 3 [ Figure 1 Figure 4

Claims (1)

[Claims] A high frequency filter consisting of a cavity and an internal conductor element provided in the cavity is attached to the substrate, and the internal conductor element is connected to an inductor and coupling elements arranged in parallel on each side of the inductor. In the method for assembling a high frequency filter device, the substrate is provided with a cavity top part and an inductor top part in advance, the cavity is provided with a support plate mounting part in advance, and the other part is provided with a support plate mounting part in advance. , the coupling element is attached in advance by printed wiring means to a support plate formed to be able to be attached to the support plate attachment part, and during assembly, A method for assembling a high frequency filter device, comprising the steps of fixing a cavity and an inductor to the attachment parts, respectively, and then attaching a support plate to which the coupling element is attached to the support plate attachment part.