JPS58223227A - Method of fixing connecting terminal - 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 The present invention relates to a method for sealing connection terminals of a single-layer component.

In recent years, there has been a demand for mechanical electronic components that are suitable for mounting on printed wiring boards, such as lightweight and compact electromagnetic relays and switches, and these electronic components can be mounted on printed wiring boards and wired using fluff coating or other methods. d) This is done by soldering the external connection terminals in an automatic soldering tank that includes heat treatment.

For this reason, for example, in the case of an electromagnetic relay, the purpose is to protect the electromagnetic relay from adhesion of flux to the electromagnetic relay body, especially the contact part, and solvent adhesion during soldering work, and to protect it from dust during operation. Therefore, electromagnetic relays are manufactured in which the main body is housed in a resin case.

Furthermore, after soldering, there are cases where it is necessary to perform so-called "washing" with the components mounted on the printed wiring board in order to remove flux from the surface of the printed wiring board, and there are cases where the printed wiring board is exposed to harmful gases such as corrosive gases during operation. In some cases, electromagnetic relays are required to have a highly airtight seal that can withstand use in In order to prevent the infiltration of the solvent, flux, harmful gas, etc. through the gaps between the parts, conventionally, as shown in Fig. 1, the electromagnetic relay body R was assembled and housed in the case 3, and then inserted into the pace 1. The periphery of the external connection terminal 2 was filled with an adhesive E such as resin, and the gap was sealed, but this method of fixing requires adhesive, which increases the material cost. Furthermore, in order to avoid excess adhesive from adhering to the soldered parts of the external connection terminals, careful attention is required during the sealing process, and assembly time is required. there were. The present invention has been made to eliminate these drawbacks and provide inexpensive electronic components (electromagnetic relays, etc.).The present invention will be explained below in sequence with reference to the drawings.

2 to 6 are diagrams for explaining an embodiment in which the present invention is applied to an electromagnetic relay, and FIG. 2 (A
) T (B) is a side view and a bottom view of an electromagnetic relay embodying the present invention, respectively, FIGS. 3(A) to (D) are sectional views of essential parts explaining the fixing method according to the present invention, and FIG. Illustrated prisoner~(
9) is a cross-sectional view of the main part after implementing the present invention for various shapes of external connection terminals, and FIGS. 5 and 6 are cross-sectional views of the main part showing other embodiments of the external terminal insertion hole. It is a diagram.

In Figures 2 to 6, 1 is a paste molded from thermoplastic resin, 2 is an external connection terminal (hereinafter referred to as a terminal),
3 is a case, R is the electromagnetic relay body, F is a mold for secondary molding (hereinafter referred to as the mold), and in Pace 1, 11 (11A, 11B) are terminal insertion holes (hereinafter referred to as holes). .) 12 is the thick part, 21 is the groove in the terminal 2, 2
2 is a protrusion, and in the mold F, a recess for fl-forming, f
2 is a side view of the depression fl, which is an escape hole for the terminal f3. As shown in FIG. 3 (4), the pace 1 is provided with a hole 11 penetrating the front and back sides through which the terminal 2 is inserted.
A thick wall portion 12, which is thicker than other portions, is formed in a cylindrical shape around the periphery. Further, the inner diameter dimension r1 of the hole 11 is set to be slightly larger than the diameter dimension r2 of the terminal 2, so that the terminal 2 can be easily inserted into the hole 11. As shown in FIG. 2, after assembly of the electromagnetic relay main body R, the terminal 2 is inserted through the paste 1, and the electromagnetic relay main body R is housed in a case 3 which also serves as a protective cover.

Of course, in this case, the electromagnetic relay body R housed in the case 3 should be held in position (5) by appropriate means so as not to shift. In this state, the hole 11 of the paste 1 and the terminal 2 are arranged with a slight gap g as shown in FIG. 3(4).

From this state, as shown in FIG. 3 (I3), the mold F heated to such an extent as to soften and melt the resin constituting the paste 1 is moved and pressed down along the axial direction (arrow direction) of the terminal 2. By the way, as shown in FIG. 3(B), the mold F has a thick wall portion 12 having a side wall surface f2 formed as an inclined surface.
It consists of a recess fl for the next forming process and an escape hole f3 for the terminal when the mold F is moved during the secondary forming process, and the diameter r4 of the opening of the self fl is the same as that of the pace 1. The diameter dimension r3 of the thick portion 12 is somewhat larger, and the recess 1f1
The diameter dimension r5 of the bottom part is the diameter dimension r of the thick part 12 of the pace 1.
3, and when the mold F is lowered, the thick portion 12 is contained in the recess fl. It goes without saying that the diameter of the escape hole f3 of the terminal 2 is set larger than the diameter of the terminal 2.

(6) Therefore, as shown in Fig. 3(B), when the mold F is moved and compressed in the direction of the arrow, the 12-thick part of Pace 1 is enclosed inside the depression fl of the mold F, and the slope is Due to the formed side wall surface f2, the resin in the thick part 12 is drawn into the hole 1 during the rolling process.
Fig. 3 (C)
As shown in FIG.
are in close contact with each other. Since the deformation of the thick portion 12 is plastic deformation, the deformation is maintained as it is even if the mold F is removed after the secondary molding process, as shown in FIG. 3(9). In this way, the terminal 2 is sealed and fixed to the paste 1 after the resin has cooled.

Various modifications are made to the shape of the terminal 2 in order to enhance the fixing and sealing effect of the terminal 2 by the method according to the present invention. 4(A) to 4(D) show the deformation of the shape of the terminal 2. FIG. B) is the one in which the protrusion 22 is provided around the entire circumference of the fixed part of the terminal 2, Fig. 4 (C)
4 shows a case in which a groove 21 is provided in the axial direction of the fixed part of the terminal 2, and a protrusion 22 is provided in the axial direction of the fixed part of the terminal 2.

3(A) to (D) above for terminals of these shapes.
When the terminal 2 is fixed to the paste 1 by the fixing method explained in , the thermoplastic resin of the thick part 12 is attached to the groove 21 or the protrusion 22.
Figure 3 (A).

The shape shown in (B) is effective in obtaining a structure to prevent the terminal 2 from coming out and a better sealing structure, and the shape shown in FIGS. 3(C) and (D) is ,
This is effective in obtaining a structure for preventing the terminal 2 from slipping out and a structure for preventing rotation.

In addition to the above, the same effect can be obtained by providing an appropriate shape of unevenness or knurling on the fixed part of the terminal 2. Furthermore, if the terminal 2 itself has a prismatic shape, it can rotate by itself. Provides a stopping effect.

Note that for the terminal 2 provided with the protrusion 22, the pace 1
Needless to say, the diameter r1 of the hole 11 is set to be slightly larger than the diameter of the virtual circle in which the protrusion 22 is inscribed and centered on the axis of the terminal 2. refers to the diameter dimension of the above-mentioned virtual circle.

In the structure of the terminal 2 described above, as shown in FIG. 5, the hole 11 of the paste 1 is
A portion 11A having a diameter slightly larger than the diameter across the projection 22, and a portion 11B having a diameter slightly smaller than the diameter across the projection 22 and slightly larger than the diameter of the terminal 2.
If the two-stage structure is adopted, the relationship between the structure of the hole 11 and the shape of the terminal 2 becomes a means for positioning the buried and fixed position of the terminal 2, which is convenient. Incidentally, FIG. 5 shows the shape before the secondary molding process.

Furthermore, the present invention can also be applied to the production of electronic components such as relay terminals in which the terminals 2 do not penetrate the front and back sides of the paste 1. That is, as shown in Figure 6,
The paste 1 is provided with a hole 11 having a non-penetrating opening on one side, and the terminal 2 may be inserted into the hole 11 to perform the above-mentioned secondary forming process. In this case as well, it is more effective if the seed (9) is provided with a structure that prevents the seed from rotating or being pulled out as described above. Incidentally, FIG. 6 shows the shape after the secondary molding process.

In addition, in the above description of the embodiment, the results are obtained based on the case where a heated mold is used, but the so-called ultrasonic wave processing is performed by applying ultrasonic vibrations to the mold F and heating the material of PACE 1 itself due to molecular motion, etc. The above-mentioned secondary forming process is also possible by processing.

The key is to partially form the thick part 12 of Pace 1 (secondary forming process)
The gist of the present invention is a method of sealing the terminal 2 through
Differences in the means of secondary molding, the shape of the terminal, the shape of the paste, etc. do not change the gist of the present invention.

As explained in detail above, according to the fixing method according to the present invention, terminals can be sealed without using materials such as adhesives, so the process of fixing terminals is not only simplified but also simple. This method provides the advantage that it is easy to fix the terminal to a resin that is not suitable for adhesives.

Further, according to the present invention, there is no mixing of adhesive or the like into the main body of the electronic component (10), so the present invention is particularly effective for mechanical electronic components such as electromagnetic relays.

In the above explanation, the present invention was mainly applied to an electromagnetic relay, but the present invention can be applied to any electronic component as long as the terminal is embedded and fixed in a thermoplastic resin paste. I can do it.

[Brief explanation of drawings]

FIGS. 1(4) and 1(B) are a side view and a bottom view showing a conventional example, and FIGS. 2 to 6 are diagrams explaining the present invention in detail,
Figures 2 (A) and (B) are side and bottom views of an electronic component implementing the present invention, and Figures 3 (4) to (D) are cross-sectional views of essential parts of the processing method according to the present invention. Figure, Figure 4 (A)
Figures 5 and 6 are sectional views of essential parts for explaining other embodiments of the present invention with respect to various terminal shapes. 1...Base 11 (IIA, IIB)...Terminal insertion hole 12...
Thick part 2...Terminal 21...Groove
22...Protrusion F...Mold for secondary molding 1.
... Forming surface f2... Side wall surface Fig. 1 Fig. 2 (A) (δ) Fig. 5 Fig. 6 (D) Fig. 4 (A) (8) (c) (o> Procedure Amendment (Relationship to the case) Applicant 4, Agent Address 2-6-2 Marunouchi, Chiyoda-ku, Tokyo, 330m, Shigesu Building 2-7, Particulars subject to amendment 1 Column 8 of Detailed Description of the Invention, Contents of the Amendment As shown in the attached document, the following matters in the specification of the application will be amended. In the second line of page 1 and 3, the words ``Fla-tsuku coating'' have been corrected to ``Flux coating.'' 2. On page 3, lines 6 to 7, the phrase "from the adhesion of flux and sox" is corrected to "from the adhesion of flux and solvent to the electromagnetic relay body 9, especially the contact parts." . 3. On page 4, lines 13 and 14, the phrase "about the embodiments of the present invention" is corrected to read "the embodiments of the present invention." 4. On page 5, line 7, it says ``Toi 5゜) 12 is''. ), 12 is corrected. 5. On page 8, lines 7 and 10, the words ``Figure 3'' are corrected to ``Figure 4.'' 6. On page 5, line 10, the word "side view" is corrected to "side wall surface."

Claims (1)

[Scope of Claims] 1. A hole provided in the fixed portion of the connecting terminal and set to a diameter that allows the connecting terminal to be inserted, and a hole provided in the peripheral edge of the reading tag and formed thicker than other portions. A thermoplastic resin is molded to form a paste so as to have a thick part, and a connecting terminal is inserted into the hole of the paste, and then the thick part is secondary molded in the direction in which the diameter of the hole is reduced. A method for fixing a connecting terminal by molding and fixing the connecting terminal to the paste. 2. The method for fixing a connecting terminal according to claim 1, wherein the holes penetrate through the front and back sides of the paste. 3. The method for fixing a connecting terminal according to claim 1, wherein the hole is opened on one side of the paste. 4. The method for fixing a connecting terminal according to claim 1, wherein the fixed part of the connecting terminal has a structure to prevent it from coming off. 5. The method for fixing a connecting terminal according to claim 1, wherein the part to be fixed of the connecting terminal has a rotating structure. 6. A protrusion is formed on the fixed portion of the connection terminal, and the hole has a two-stage structure consisting of a portion into which the protrusion formation portion of the connection terminal can be inserted and a portion into which it cannot be inserted. A method for fixing a connecting terminal according to item 1 or 2. 7. The method for fixing a connecting terminal according to claim 1, wherein the secondary molding is performed using a mold heated to an extent that the paste is softened and melted. 8. The method for fixing a connecting terminal according to claim 1, wherein the secondary molding is performed using an ultrasonic mold. 9. The method for fixing a connecting terminal according to any one of claims 1 to 8, wherein the connecting terminal is an external connecting terminal of an electromagnetic relay.