JPS5932919B2 - Electric circuit wiring body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric circuit wiring structure, and particularly to a soldering wiring structure for electronic components that does not use a printed circuit board.

Electrical circuit wiring for high frequency tuners and the like can be divided into two methods: a printed wiring technique using a printed circuit board, and an aerial wiring or young angle wiring technique in which lead wires of electronic components are connected to each other by soldering. The former printed wiring method is advantageous in that it is suitable for automation in the assembly of circuit components and the soldering process, but in high-frequency circuits, due to the influence of high-frequency characteristics on the material of the printed circuit board, the characteristics may deteriorate or relatively expensive materials are required. Furthermore, the mounting density of components is regulated, limiting desired miniaturization and making the printed circuit board itself an essential component. On the other hand, the latter aerial wiring method enables dense wiring in a space by sandwiching many parts, but it is difficult to automate the soldering work and requires skilled workers and a large amount of time. However, this wiring method has the advantage of not only improving high frequency characteristics but also being extremely economically advantageous in that it eliminates the use of a printed circuit board. In particular, in high-frequency circuits that use a metal chassis base as a shielding body, the chassis base has the function of holding the circuit's electronic components, so there is virtually no requirement for a printed circuit board holding function. An aerial wiring method that does not use is effective. Therefore, there has been a desire for an electrical circuit wiring body and its manufacturing method that can perform automatic soldering as in the printed wiring method, and that is economical and does not require a printed circuit board as in the aerial wiring method, and that can improve characteristics. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a new and improved electric circuit wiring body including a circuit component directly soldered to a metal substrate of a chassis base and a circuit component soldered to its support lead via a stop terminal. There is a particular thing. Another object of the present invention is to provide a new and improved manufacturing method for an aerial wiring body in which the above-mentioned wiring body constructed without using a printed circuit board is automatically soldered using a solder processing apparatus similar to that used for printed wiring. According to a first aspect of the present invention, a first circuit component is soldered to a metal substrate of a chassis base, and a first circuit component is wired to one side of the metal substrate via a support lead and an eyelet terminal of the circuit component. An electrical circuit interconnect including a second circuit component is disclosed.

Since this wiring body is wired in the air without using a substantial printed circuit board, it is advantageous for improving high frequency characteristics and is economically inexpensive. In particular, a grommet terminal is used at the connection point between the second circuit component, and a grommet terminal soldered to the support lead of the first circuit component is used between the first and second circuit component. A connection between is achieved. Accordingly, an electric circuit comprising a first circuit component on a metal substrate and a second circuit component disposed between one side of the substrate and a grommet terminal and held via the grommet terminal and the post lead. A wiring body is provided. This wiring body is applied, for example, to a fixed-side tuner circuit in a VHF tuner, in which case the top plate of the chassis base is used as a metal substrate, and a ground terminal is connected here.
Circuit components such as a phono jack and a feedthrough capacitor are fixed as first circuit components using a high temperature solder material. On the other hand, the second circuit components are made up of electronic components such as coils, capacitors, resistors, diodes, and transistors that form the tuner's main circuit, and are soldered to each other via eyelet terminals, and are connected to the first circuit components. A predetermined circuit is constructed by holding the second circuit component in a space on one side of the metal substrate by soldering the support lead and the eyelet terminal. According to a second aspect of the present invention, a first soldering process of soldering a first circuit component to a metal substrate, a process of inserting a stopper terminal into a through hole of a jig plate,
A step of inserting the support lead part of the first circuit component and the drawer lead part of the second circuit component into the eyelet terminal, a step of regulating the metal board and the jig plate at a predetermined interval and incorporating them into the assembled body, a second soldering process of soldering the assembled bodies to each other at their eyelet terminals; a process of cutting and removing unnecessary portions of the leads of the soldered assembled body;
A method for manufacturing a wiring body is presented, which includes a third soldering process for correcting and soldering the cut portion of the lead portion, and a process for removing the jig plate from the assembled body. In this wiring body manufacturing method, for example, the first soldering process involves assembling relatively high-temperature ring-shaped solder material onto the metal board together with the first circuit component, and heating the first circuit component onto the metal board using a conveyor-type soldering furnace. In contrast, in the second and third soldering processes, solder material treated at a relatively low temperature is soldered by a solder immersion method similar to that used in printed wiring methods, for example, by a jet-type automatic soldering device. Ru. Therefore, a method for manufacturing a wiring body is proposed which can be automatically processed in the same manner as in conventional printed circuit boards. What should be noted here is that the soldering to the eyelet terminals is effectively done through the capillary action of the molten solder, and that a reliable solder connection is achieved by corrective soldering after cutting off the unnecessary lead parts. It is. Furthermore, since the second and third soldering steps are performed as an assembled body with a jig plate inserted, the arrangement of each circuit component can be precisely regulated. The electrical circuit wiring body and its manufacturing method described above are effective from both a characteristic and economical point of view when applied to high-frequency circuits such as tuners, and are particularly useful for the movable part of the rotating mechanism and the fixed part of the tuner's main circuit. This is practical in the constructed turret type tuner, etc.

That is, when the main part of the tuner circuit is formed as a fixed side circuit on the top plate of the chassis base constituting the shield case, and each channel is selected by a plurality of turret-shaped tuning coil segments, the wiring body according to the present invention can be used. The tuner circuit automates assembly, simplifies work, and stabilizes high-frequency characteristics. The wiring body and its manufacturing method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a main circuit diagram of a turret type HF tuner constructed using the wiring body of the present invention. This tuner has UHF moving parts. ．． It is constituted by a coil unit 1 for relaying an IF signal and a plurality of coil units 2 for VHF reception, and is constituted by a wiring body of the present invention in which a fixed part is connected to a group of fixed side terminals 3. This wiring body is characterized in that circuit components are connected by connection points 4 using eyelet terminals, and eyelet terminals are used at 2.0 connection points 4 in the circuit diagram of FIG. In particular, the formation of the connection point 4 in which the stop terminal is held by each support lead of the feedthrough capacitor, the ground terminal, and the phono jack terminal enables stable attachment to the chassis base board. Input/output signals to this tuner wiring body are sent to the phono jack type UIF input terminal (U
IFin), VHF input terminal (Vin) and IF output (
IFOut), feedthrough capacitor support lead type AGC signal terminal (AGC), B power supply terminal (+B),
AFT signal terminal (AFT) and UHF power supply terminal (UB)
It is supplied and output from. FIGS. 2 to 7 explain each process of the method for manufacturing a wiring body according to the present invention.

Here, FIG. 2 shows a completed wiring body, in which a phono jack 11, a feedthrough capacitor 12, and a ground terminal 13 are fixed to a metal substrate 10 of a chassis base with solder 14. These first circuit components 11 to 13 are connected to respective pillar leads 1.
5 and eyelet terminal 16 to resistor 17 and capacitor 18.
, the lead 2 of the second circuit component such as the transistor 19
5 and wired in the air on one side of the metal substrate 10.
Since such a wiring body arranges circuit components in a predetermined space without using a printed circuit board, high frequency characteristics can be maintained well. That is, by removing the printed circuit board, undesired coupling and loss due to strain capacitance in a high frequency signal processing circuit can be greatly improved. FIGS. 3 to 4 are cross-sectional views showing a method for manufacturing a wiring body according to the present invention,
Figure 2 shows each process to obtain the wiring body.
The figure shows a phono jack on a metal substrate 10 of a chassis base.
The state in which the first circuit components 11 to 13 with the feedthrough capacitor and the ground terminal support leads are soldered and fixed is shown.

The metal substrate 10 has a through hole through which the support lead 15 of each circuit component is inserted, and a first ring solder 14 or the like is applied around the through hole.
The first circuit components 11 to 13 are placed through the solder material. In this arrangement, the first circuit component and the metal substrate are bonded together through a soldering furnace in which the solder material is melted. Here, the first solder material is processed at a high temperature using a solder material having a higher temperature than the second solder material of the assembled body, which will be described later. FIG. 4 shows a jig plate 20 having a through hole into which a grommet terminal 16 can be inserted and held at a predetermined position, and a grommet terminal 16 and second circuit components 17 such as resistors, capacitors, transistors, etc. inserted into the through hole. 19 and the pull-out lead 25 is inserted into the eyelet terminal 16 to demonstrate assembly.

Here, the jig plate 20 is made of stainless steel, which does not adhere to solder. Both the insertion of the eyelet terminal 16 into the jig plate through-hole and the insertion of the second circuit components 17 to 19 into the eyelet terminal can be easily automated, thereby improving work efficiency. FIG. 5 shows that the sub-assemble bodies prepared in advance in FIGS. 3 and 4 are assembled into one body using the main assembly jig 21, and the metal substrate 10 is inserted into the insertion hole of the eyelet terminal 16 of the jig plate 20. The lower mold jig 22 and the upper mold jig 23 of the assembling jig 21 are inserted to insert the support leads 15 of
and combine them.

For example, the metal substrate 10 on which the first circuit component is soldered is stacked on the jig plate 20 in which the second circuit component and the eyelet terminal are assembled using the lower jig 31, and then pressed by the upper jig 23. do.
In this way, both sub-assembled bodies held by the assembly jig 21 are handled as the main assembled body 25 in this state until the next soldering process is completed. The assembled body 26 shown in FIG. 5 is subjected to flux treatment and solder dipping treatment in the same manner as the soldering treatment of ordinary printed circuit boards in order to fix the numerous leads inserted into the eyelet terminals 16 together with solder 24. .

Usually, the eyelet terminal part to be soldered is immersed in solder using the jet or flow method, and the action of surface tension causes the solder to seep into the insertion hole of the eyelet terminal, thereby achieving solder connections at each connection point. Ru. Assembled body 4 soldered in this way
As shown in FIG. 6, the soldering state of No. 0 is uneven and icicle-like, leaving unnecessary lead portions.

Therefore, unnecessary lead portions are cut and removed from the assembled body 30. For example, the terminal 16 is shaped by inserting the cutter 1 into an eyelet and cutting a portion of the tip of the terminal 16. After shaping the cutter, the hollow part inside the eyelet terminal 16 is exposed, so the soldering process is performed again for correction. FIG. 7 shows the soldered state after the corrected soldering process.

The end side cut surface of the eyelet terminal 16 is a modified solder 24.
Creates a more reliable connection point. After this soldering process, the assembly jig 21 and jig plate 20 are removed. the result,
A wiring body using the aligned eyelet terminals 16 as relay connection points is formed in a space on one side of the metal substrate. This type of wiring body is used for assembling the tuner as it forms a fixed part of the tuner shown in FIG. The modified soldering process is performed in the same manner as the second soldering process, but the assembled body 40
may be carried out at relatively high temperatures, making flux treatment difficult.

Therefore, in the flux treatment in such a case, a rotating flux-impregnated mat or the like is used to perform flux treatment on the corrected solder surface so that the flux can be effectively applied even if the foaming of the flux is eliminated by the hot assembled body. An important feature of the wiring body and its manufacturing method of the present invention described above is that it enables soldering by a printed wiring method without using a printed circuit board, and this makes it possible to obtain an aerial wiring method that is desirable for application to high frequency circuits. be.

In other words, we aim to reduce material costs by omitting the printed circuit board, and reduce assembly processing costs by converting manual soldering work for aerial wiring into automatic soldering work in the same manner as printed wiring, resulting in lower costs and improved characteristics. To provide a wiring body.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a VHF tuner using the wiring body of the present invention, FIG. 2 is a side view of the wiring body according to the present invention, and FIGS. 3 to 5 are each step of the wiring body of FIG. 2. The cross-sectional view, and FIGS. 6 and 7 are similarly enlarged cross-sectional views of another process of manufacturing the wiring body. 4... Connection point using eyelet terminal, 10...
...metal board, 11-13...first circuit component, 14...solder, 15...post lead, 16...eyelet terminal , 17-19...
...Second circuit component, 20...Jig plate, 21.
...Assembling jig, 24...Solder, 2
5...Assembled body.

Claims (1)

[Claims] 1. A first circuit component having a support lead, a metal board to which the circuit component is soldered and the support lead protrudes from one side, and a predetermined position spaced from one side of the metal board. The eyelet terminal is soldered to the support lead, and a second circuit component is soldered to the eyelet terminal and disposed in a space between the metal plate and the eyelet terminal, and the eyelet terminal is connected to the eyelet terminal. An electric circuit wiring body, characterized in that it serves as a connection point between the first and second circuit components. 2. The first circuit component is fixed to a predetermined position on the metal board by soldering with a first solder material, and a stop terminal is inserted into a jig plate having a through hole corresponding to the predetermined position, and Second
Insert the lead-out lead of the circuit component and the support lead of the first circuit component to position the metal board and the jig plate to form an assembled body, and connect the eyelet terminal of this assembled body. The second solder material is fixed by soldering, and after this soldering, unnecessary portions of both lead portions are removed from the assembled body, and after corrective soldering, the jig plate is removed from the assembled body. An electric circuit wiring body according to claim 1.