JPS6139513A - Method of mounting lead terminal in electronic component - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to the process of attaching lead terminals included in a 1934-style electronic component in which the lead terminals are soldered to the electrodes of the electronic component body. There are some related to how to attach lead terminals.

For example, in the yJ structure of an electronic component such as a ceramic capacitor, where the lead terminal is attached (:j l-J), the lead wire is attached to the electronic component body. It involves a process. This process is often done by half+11 r=
1, but in efficiently processing Okawa's electronic components, soldering is accomplished by immersion in a half-tU bath.

However, J-togi using the above-mentioned immersion method,
A relatively large amount of solder is lost to the entire electrode of the electronic component (= J-1), and to the parts that do not directly contribute to the connection of the lead pant, resulting in a problem of wasted solder.

Therefore, the following two methods were proposed: (1) applying solder only to the tip of the lead terminal in advance;
3) Heat this while keeping it in contact with the electrode of the electronic component body, and melt 'l' 11 with the 'I' wire. lt! Sa U
There is C of b where you are trying to achieve 1 inch of solder. FIGS. 5J and 6 show the state in which a ceramic condenser is fitted with a culm of 5° and a half.

For example, with reference to FIGS. 5 and 6,
Electrodes 2.2 are provided on the front and back surfaces of the body 1, respectively. The lead terminal 3 has a shape f made by bending a single piece of metal wire.
n;, and each end is pre-applied with solder +I'-J
and flux is applied if necessary. The element body 1 is elastically supported between each end of the lead terminal 3. In the preliminary assembly 4 of the lead terminals 3 and the element body 1 which have been plated 1) in this way, the respective electrodes 2 are arranged on one plane in a J: pattern.
It is sent in the 5th direction of the 51st M arrow.

Hot air is applied to the plurality of pre-assemblies 1, which are being sent in an array, in the direction and position shown by the arrow 6 in FIG. This hot air is blown out from a fixed outlet (not shown) with a size of 45mm. The blowing direction of the hot air is perpendicular to the traveling direction of the spare assembly 4, but is diagonal to the lead terminal 3. The hot air is not directly applied to the part of the lead terminal 3 that is lυ(N1'4), but is chosen to avoid direct contact with the element body 1, as shown in Figure 6. The reason is that the cracks in the element body 1 that may occur in the case of IJJ where hot air is directly spread can be
-It's for the purpose of doing so.

In this way, in the conventional method described above, the lead terminal 3 is heated by first heating the part d3 to which the hot air has been applied, and the heat is transmitted through the lead terminal 3 to the part previously applied. Melt the wire and solder the jiff pole 2 and lead terminal 3.

Problem L+j to be Solved by the Invention According to the above-mentioned prior art, a heating cup l is used to raise the temperature of the preliminary solder placed on the lead terminal 3 to its melting point.
Since υ depends on heat conduction via the lead terminals 3, a relatively long time is required for such heat transfer, making it impossible to increase productivity. In addition, since the hot air outlet is only on one side 1111 (for example, the upper side in FIG. 6), the way the heat is transmitted to each end of the lead terminal 3 is different depending on the structure, and even if the hot air circulation is not properly generated. Even if a cover (not shown) is installed to prevent the soldering, the disadvantage is that the soldering conditions of the upper and lower electrode surfaces 2 of the element body 1 cannot be made equal.

Furthermore, 1-) The conventional method described above is to
Although consideration has been given to preventing the occurrence of cracks in t), the occurrence of cracks cannot be completely avoided.1. Next to that, the 71st! '/! Please refer to Figure 11! ! ! 1. /τ゛Explanation.

Figure 7 J5 and Figure 8 show lead tubes in heated condition.
/) Since the amount of heat applied to the element body 1 is 1 [I, etc.) S, shown by one line, Fig. 7 shows (is shown in the cross-sectional direction of the body 1,
(Figure 3 is shown facing the back side I of the element body 1). When the heating method shown in these figures is adopted, the lead terminal 3, the element body 1 is connected to the lead terminal 3 while the heat is gradually transmitted toward its end.
Temperature increases starting from the part that is in contact with the

9 and 10 show, by arrows, thermal strain forces applied to the element body 1 as a result of the above-mentioned temperature rise. FIG. 9 shows the force in the cross-sectional direction of the element body 1, and The figure shows the force in the plane direction of the element body 1. .

Note that the arrows indicated by dotted lines in FIG. 10 represent the distribution of force on the back side of the element body 1 as shown in the diagram. The element body 1 becomes hotter at the part where it is in contact with the lead terminal 3 and expands to a greater extent, but as it gets further away from the lead terminal 3, the humidity becomes lower and the expansion force decreases. are J and J shown by arrows in FIG. 9 J3 and FIG. 10, respectively.

As a result, as shown by arrows 7a and 7b in FIG.
Cracks 8a and 8b are formed in the parts where the force applied to the element body 1 is large.
This invention has a 1 degree lever on the occurrence of l.
i 111.1 melts the solder while applying heat to the given terminal, thereby making it semi-I'll
The method of installing lead terminals by performing ft.
This is an attempt to solve the problems of productivity as described above, the problem of uneven soldering on the upper and lower surfaces of the element body, and the problem of occurrence of cracks in the element body.

Means for Solving the Problem of νΩ In this invention, in order to solve the above problem, the method of applying hot air to melt the solder is a special feature.

In other words, a pipe in which a slit that extends continuously in the axial direction is formed and a hot air outlet for flowing hot air in the axial direction is provided is III tc.
be done. On the other hand, a lead terminal to which solder has been applied in advance is used, and one electronic part suspension cable is temporarily held at the lead end r, with the soldered part of this lead terminal avoiding contact with the electrode of the electronic component body. I'll leave it as that.

The electronic component element (hereinafter referred to as a preliminary assembly) temporarily held by this lead Q;1: lead 4
;;: The child passes through the pickpocket =l+- and is pulled out of the pipe and then passed into the pipe. At this time, the traveling direction of the preliminary assembly is opposite to that of the hot air. In this way, the solder applied to the lead terminal is melted, and 2+'ITj attachment is achieved.

Effects of the Invention According to this invention, the heat exchanger that makes it possible to melt solder
Since the l is supplied into the vibrator, the energy efficiency is high, and it has been confirmed that the energy efficiency is increased by more than 50% compared to the conventional energy efficiency. It can be preheated from the stage when it is introduced into the vibrator, and can be sufficiently preheated while passing through the vibrator. This makes it possible to avoid cracks in the element body due to thermal shock, and to realize a highly reliable lead terminal attachment method. In addition, since the heating state can be made uniform at different locations on the cable f, it is possible to achieve half Ui evenly at each location. Furthermore, since the lead terminal and the element body can be preheated at the same time, high-speed processing is possible and productivity is improved. According to ``1-Tatsuki'', the state in which the tatsuki is real/one color is shown. In Figure 1, 13
The pre-assembly 4 is similar to the one shown in FIGS. Apply flux to one corner of the inner cloth: After that, the element body 1 is attached to each end of the lead terminal 3.
To be held at 1, J-τ is also held Δ. Each kitten Asen I'J4 is #Ll element, body 1
The surfaces on which the electrodes 2 are formed are lined up in a single plane, arranged in a cross-shaped pattern, and moved in the direction indicated by the arrow 9. , This movement is performed by moving the bent portion of the lead terminal 3 of each preliminary assembly 4 and the vicinity of the lead terminal 3 by appropriate means (not shown).
It is carried out while being held in place.

The preassembly 4 described above is threaded into the pipe 10.

The pipe 10 is formed from a ridge or other temporary groove 1 and is provided with a slit 11 extending continuously in the axial direction of the pipe 10. The lead terminals 3 of the preliminary assembly 1 described above are drawn out to the outside of the pipe 10 through this slit.

Therefore, the spare assembly 194 is installed outside the pipe 10.
Rideho 1. +? Even if the width 4 of the slit 11 allows the passage of the lead terminal 3, it is poisonous.
, the smaller is preferable. For example, the convergence of Slip 1-11 is 5111111Pi! degree tosarel.

A hot air outlet 12 is provided at a predetermined length n from the inlet end of the pipe 10. In this embodiment, two hot air outlets 12 are provided above and below the pipe 10, facing each other. The hot squirting rko 12 is in the form of JIi FJruze,! The dam 13 extends through the pipe 10. , the distance between the tip of the conduit 13 and the central axis 14 of the pipe 1o, l1Jt #, ,
It is said to be about 20-30ml11. 2 a) >t
p tube 13.12. , , each central axis 15.1
5 intersect at one point on the central axis 14 of the pipe 1o1. Shite, 1lf1. 'ao, central axis 615 and b? Bu10(1), central axis t! 1114 and the pattern angle is 1 year old,
l2 ande! Two r'! It is said to be 5 degrees. like this(,,
, when the dedicated pipe 13 was fired and installed around 1, the heat was 8il.
Heat I blown out from the blowout C112! Lt is vibe 10
Inside the vibrator 10, the flow moves in the direction of arrow 1. This arrow 16 is opposite to the advancing direction (arrow 9) of the preparatory assembly 4. The element body 1 is positioned so as to pass through the central axis 14'' of the pipe 10.

Sat J Ho's. 1. The first assembly 4 is the vibrator 1.
While passing through 0, it is preheated by Wf+, and finally, the heat 1
! n (blowout 1: I self-receives heat Jjl from 12 1): II of Lc ni゛Ii r (1 attachment is completed - (l-ru 1゜ Figure 2 is the Δ arrow 62 diagram in Figure 1) and pipe 10
The relationship between the inside (3) and the hot air 17 is shown.As can be seen from this figure 2, the hot air 1
7 is distributed evenly on the 1-bottom surface of the element 1 included in the 'F 1lill/' assembly 4 ('l-III lノ, so the heat transfer is also uniform. That I, :me, Imi rainbow) Half IJI month is possible.Also, half ffl (=1 acts on the completed preassembly 4 and lζζ output17, sequentially completes the subsequent preassembly 4 (!+ #lI
Therefore, the heat η of elementary body 1 is 'Fl;
Avoid the occurrence of cracks due to i-attack, 1lif7t
9 and 1V, and energy is improved by more than 50% compared to conventional products such as young cows.

3 and 4 show the temperature distribution within the pipe 10 carried out in accordance with the present invention. The data shown in these drawings is based on a total diameter of 1 m and an internal diameter of 16.0 m.
This is a case where a 500° C. pipe is used and hot air of 500° C. is supplied from the hot air outlet. .

In FIG. 3 J3 and FIG. 11, the horizontal axis shows the radial distance from the central axis 14 of the pipe 1°, and the vertical axis shows the temperature. In addition, the temperature measured on the vertical axis is measured on a straight line passing through the central axis 1/I of the pipe 10 and the center of the slit 11 in the width direction.

In Figure 3, hot air outlet J, t13ooI, 6, respectively.
The item 1α in the pipe 10 at a position of 00 mm is shown. Center axis of pipe 10 ¥4111/l-1, 2
The temperature increases as the preassembly progresses from 00°C to 300°C. Therefore, it is confirmed that there is a pre-U crystal heating effect.

FIG. 4 shows the hot melon portion 71i at the hot air outlet.

At the central axis 1 /I, J- of the pipe 10, the highest hot air region of 500 °C occurs, 9, such Ij2
By passing the preliminary Ahimbri 4 through the hot air area, the semi-ffl attachment is completed.

As can be seen from FIG. 3 and FIG. 4, the temperature of the preparatory assembly is gradually raised while being preheated 1711, and soldering is completed at an instant of +1i'j near the hot air outlet.

The above is an example of this invention. I31! However, the form of the electronic component, ie, the front assembly, which is suitable for the present invention is not limited to that shown in the drawings. Therefore, the electronic component element body and the TL formed thereon.
IIT iFl is 1 for electronic parts scales.
5'< Not necessarily.

Depending on the formation state of the electrodes of the electronic component body, the preliminary assembly may be changed.

In addition, IllIllIllustrated! lft'llte is ba,
Eve 10 has a circular cross section of 6, and lζ is -F of 11!
! With the shape of -) ℃ is also J. 1 Ijwal ;), this.
It may be of any shape or structure as long as it allows hot air to flow in the axial direction. In addition, although the hot air outlet is shown as one pair, two or more pairs may be provided along the axial direction of the pipe, and the hot air outlet temperature of each pair is changed, that is, as it approaches the intake port of the preliminary assembly. If necessary, the temperature of the hot air at the outlet may be lowered stepwise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a step of attaching a lead terminal 3 to a tooth body 1 according to the present invention is being carried out. FIG. 2 is a view along arrow A in FIG. 1 showing the relationship between each preliminary assembly 4 and hot air 17 in the pipe 10 in FIG. 1. 3 and 4 show the temperature Qi inside the pipe 10.
Figure 3 shows hot air Suita [IJ: 300 liters each]
The temperature m at the position III111600III11 is shown, and in FIG. 4, the temperature is 1! i! Figures 1 and 1 show the temperature distribution at the outlet. ) shows the base 1j state of Nibi Ahi Ni Noburi,
No. 61-1 shows the state of hot air being applied to the -'F' lea assembly. 7 and 8 show the lagoon 1 of the element body 1'c which appears by the conventional method shown in FIGS. 5 and 6.
Shows food distribution. Figure 9 a3. '' and FIG. 10 show the thermal strain force applied to the element body 1 due to the knot T of the knitting part 0i shown in FIGS. 7 and 8. Figure 11 is the same as Figure 9 J: and Figure 10.
The crack condition caused by the force shown in the figure is not shown. In the figure, 1 is an electronic component body, 2 is a t, l electrode, and 3 is a
is a lead terminal, 4 is a spare ahimbri, 10 is a pipe, 1
1 is a slit, 12 is a hot air blowout [1 and 17 are hot air. Figure 7 913! l! Figure 8
Figure 10 Figure 11

Claims (1)

[Claims] A method for attaching a lead terminal to an electrode provided on an electronic component body, comprising: preparing a lead terminal to which solder has been applied in advance; and attaching the soldered portion of the lead terminal to an electrode provided on an electronic component body. The electronic component body is temporarily held on the lead terminal while in contact with the electrode, and a slit that continuously extends in the axial direction is formed, and a hot air outlet is provided to supply hot air so that it flows in the axial direction. The electronic component element, temporarily held by the lead terminal, is advanced in the opposite direction to the direction of the hot air, with the lead terminal passing through the slit and being pulled out of the pipe. A method for attaching a lead terminal to an electronic component, comprising the steps of melting solder applied to the lead terminal and performing soldering.