JPH0623046Y2 - Loop mounting structure for junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a junction box used in a transmission common device for, for example, an automobile telephone, and more particularly to a coaxial cable and a loop of a channel filter in the junction box. The present invention relates to a loop attachment structure that can be easily soldered.

[Conventional technology]

Generally, when making a telephone call using a car telephone, a radio base station is installed in each radio zone in order to relay a transmission signal and a reception signal between the mobile station and a communication partner. In this radio base station, it is necessary to provide a large number of radio channels, that is, transmitters and receivers. Conventionally, an antenna sharing device that shares one antenna with the plurality of transmitters and receivers has been adopted. . In this antenna sharing device, in order to prevent a large number of transmitters and receivers from interfering with each other and radiating a disturbing signal to others, a transmitter and a receiver that share a transmission wave are used.
A shared reception device and a shared transmission device that combines transmission waves from multiple transmitters are essential.

FIG. 8 shows a schematic configuration of a general transmission sharing device, which mainly includes an isolator 20 for preventing backflow of a transmitter output, a channel filter 21 functioning as a bandpass filter, and a combination of transmission signals for transmission. The power combining unit 22, the antenna filter 24 having a large amount of attenuation in the reception band, and the single antenna 25 are electrically connected,
It is configured by mechanical connection. By the way, in order to suppress the loss between the input and the output to a low level, the power combiner 22 sets each reference point so that the impedance on the short reference point B side of each channel filter 21 seen from each combination point A becomes infinite. The electrical length l ₁ from B to the synthesis point A and the electrical length l ₂ between the synthesis points A and A are λ / 4 wavelength and λ /, respectively.
It is set to be an odd multiple of two wavelengths. That is, the power combiner 22 is configured by accommodating the coaxial cable set to have the predetermined electric length l ₁ in the junction box.

In such a transmission common device, conventionally, when the channel filter 21 is connected to the power combiner 22, as shown in FIG. 7, the cavity 2 of the channel filter 21 is connected.
The output loop 26 arranged in the la 1 and the junction box 27 constituting the power combiner 22 attached to the support substrate 30 are connected by a connector 29 connected to a coaxial cable 28. Incidentally, 31 is a dielectric resonator, 32 is an input loop, and the input loop 32 is connected to an isolator (not shown) via an input cable 33.

By the way, since a large number of channel filters 21 are installed on the support substrate 30, it is necessary to reduce the installation space of the filters 21 as much as possible. However, since the conventional channel filter 21 is connected via the connector 29 or the like, there is a problem that the installation space is expanded accordingly.

Therefore, the present inventors have proposed a connection structure as shown in FIGS. 3 to 6 in order to solve the above conventional problems.

In the figure, reference numeral 1 denotes a support substrate configured so that two sets of channel filters can be arranged in the vertical direction, and four guide pins 2 for each set are attached to the support substrate 1. It is planted in a direction perpendicular to the plane. Also,
A rectangular parallelepiped metal junction box 3 is attached to the support substrate 1, and an output loop 4 is arranged in the box 3. One end 4a of the output loop 4 is soldered to the coaxial cable 14 arranged in the junction box 3 via a connecting chip 13, and the other end 4b is on the upper surface of the convex portion 3a of the box 3. It is connected.

Reference numeral 5 denotes a channel filter, which is composed of a ceramic-made cavity 5a in which a dielectric resonator is incorporated and which is metallized, and a frame 6 which supports the cavity 5a. The frame body 6 opposes the operation plate 7 and the mounting plate 8 to which the cavity 5a is fixed, and guide pipes into which the guide pins 2 are inserted at four corners between the operation plate 7 and the mounting plate 8. 9 is inserted and fixed. A coaxial cable 10 connected to an input loop disposed in the cavity 5a is connected to the bottom surface of the mounting plate 8, and an insertion hole 11 into which the output loop 4 is inserted is formed. There is.

Connect the channel filter 5 to the junction box 3
In the case of connecting the output loop 4 in the insertion hole 11, the filter 5 is only brought into contact with the surface of the support substrate 1 so that the guide pin 2 is inserted into the guide pipe 9 of the output loop 4. Since the channel filter 5 and the junction box 3 can be directly connected to each other, the conventional connector 29 and the like can be eliminated and the installation space can be reduced accordingly.

[Problems to be solved by the invention]

By the way, in the above connection structure, since the output loop 4 is directly attached to the junction box 3, the connection chip 13 and the one end 4a of the output loop 4 must be soldered in the box 3. There is concern about the deterioration of sex. That is, when soldering in the junction box 3, there is no choice but to use the loop insertion hole 3b penetrating from the convex portion 3a of the box 3 to the bottom surface, and in this case, when soldering from above, the output loop 4 Since there is a risk of damaging the product, it is conceivable that connection work can only be done from below, resulting in a decrease in productivity.

Therefore, it is an object of the present invention to provide a loop mounting structure for a junction box that facilitates the soldering work performed in the junction box.

[Means for solving problems]

The present invention has a structure for soldering a cable and a filter loop in both ends of a junction box in which a cable having a predetermined electric length is accommodated. A feature is that a working hole for soldering that intersects the loop insertion hole is formed in a portion facing the position.

[Action]

According to the loop mounting structure of the junction box according to the present invention, since the working hole intersecting with the loop insertion hole is formed, when soldering the loop and the cable, the inside can be seen through the working hole. Therefore, since the work can be performed by utilizing this, the soldering work can be facilitated accordingly, and the decrease in productivity can be avoided.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are views for explaining a loop mounting structure of a junction box according to an embodiment of the present invention, in which the same reference numerals as in FIG. 6 denote the same or corresponding parts.

In the longitudinal direction of the junction box 3 of this embodiment,
Two coaxial cables 14, 14 having a length such that the electrical length is λ / 4 wavelength are inserted, and the opposing portions of the both coaxial cables 14 are penetrating formed in the central portion of the junction box 3. Soldering connection is made in the hole 16 via the connection chip 13a. Further, the opposing portions of both semi-rigid cables 15 having a length orthogonal to the coaxial cable 14 and having an electrical length of λ / 2 wavelength are also soldered to the connection chip 13a. Further, a ground rod 17 which can move back and forth is provided under the through hole 16.
Is disposed with its upper surface facing the connection chip 13a.

Further, loop insertion holes 3b are formed through both ends of the junction box 3, and one end 4a of the output loop 4 is inserted into each of the insertion holes 3b, and the one end 4a is a connection chip. The coaxial cable 1 through 13
4 is connected to the tip. The other end 4b of the output loop 4 is soldered to the protrusion 3a.

Work holes 18 for soldering are formed in both side walls 3c of the junction box 3 in the longitudinal direction of the box 3 and side walls 3d adjacent thereto. Each of the working holes 18 communicates with the loop insertion hole 3b at a position orthogonal to the loop insertion hole 3b at a position facing the connection tip 13 to which the one end portion 4a of the output loop 4 and the coaxial cable 14 are connected. 13 is visible from the outside. A cover plate 19 for closing the work holes 18 is detachably attached to each work hole 18.

Next, the function and effect of this embodiment will be described.

The junction box 3 is for combining the transmission signals from the respective channel filters 5 with low loss and sending them to the antenna via the antenna filter. Therefore, the coaxial cable 14 and the semi-rigid cable 15 are respectively provided. The electrical lengths are set to λ / 4 wavelength and λ / 2 wavelength (see FIG. 8).

Here, in this embodiment, the output loop 4 is soldered and connected to each coaxial cable 14 in the junction box 3, but in this case, first, from the working hole 18 of the side wall 3d of the junction box 3 to the connection chip 13. And insert the tip of the coaxial cable 14 into the connection tip 13
Insert it into the hole. Next, the one end 4a of the output loop 4 is inserted into the hole on the upper surface of the connection chip 13. Then, for example, a positioning jig is inserted from below the loop insertion hole 3b to support the connection chip 13 at a predetermined position, and in this state, the solder and the soldering iron are inserted from the respective working holes 18, The connection chip 13 is soldered to the one end 4a of the output loop 4 and the coaxial cable 14.

As described above, according to the mounting structure of the output loop 4 of the present embodiment, since the working hole 18 is formed in the portion of the junction box 3 facing the soldering position, the working hole 18 is used to utilize the output loop 4 and the coaxial cable. 14 can be easily connected by soldering, and productivity can be improved as compared with the case where only the loop insertion hole 3b is used.

Although the three working holes 18 for soldering are formed in each of the side walls 3c and 3d in the above embodiment, the number of working holes is not limited to this, and at least one working hole is formed according to the soldering work. do it.

In the above embodiment, the case of the output loop has been described as an example, but the present invention can be applied to the one in which the input coupling portion is realized by the loop, and to the one having both the input loop and the output loop. it can.

[Effect of device]

As described above, according to the loop mounting structure of the junction box of the present invention, since the working hole intersecting with the loop insertion hole is formed at the position where the cable and the loop of the junction box are soldered, the soldering work is easy. There is an effect that can be.

[Brief description of drawings]

1 and 2 are for explaining an output loop mounting structure of a junction box according to an embodiment of the present invention. FIG. 1 is a perspective view showing a soldering working hole thereof, and FIG. ) Is a plan view of the junction box, second
Figure (b) is a sectional view taken along the line IIb-IIb, Figure 3 (a) and Figure 3.
(b) is a side view showing the supporting substrate, a front view thereof, FIG. 4 is a side view showing a state in which the channel filter is attached to the supporting substrate, and FIGS. 5 (a) and 5 (b) are respectively shown. A front view and a bottom view showing a channel filter, FIG. 6 is a perspective view for explaining the formation process of the present invention, FIG. 7 is a schematic view for explaining a conventional connection structure, and FIG. 8 is a general view. It is a schematic block diagram which shows a transmission shared device. In the figure, 3 is a junction box, 4 is an output loop (loop), 5 is a channel filter, 14 is a coaxial cable, and 18 is a working hole for soldering.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toru Tanizaki Toru Tanizaki 2 26-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Shigeji Arakawa 2 26-10 Tenjin, Nagaokakyo, Kyoto Stock Murata Manufacturing Co., Ltd. (56) Reference JP 62-245701 (JP, A) JP 59-133702 (JP, A) JP 63-299602 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A junction box, which connects a branch portion of a common line and a plurality of filters, and which has a built-in cable having a length that provides a predetermined electric length, wherein the cable is provided at both ends of the junction box. A structure for soldering a loop of a filter and a filter, in the portion facing the soldering position of the junction box, a junction box characterized by forming a soldering working hole intersecting the loop insertion hole. Loop mounting structure.