JPS624808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a reed relay in which the thickness of the outer resin is kept constant.

Conventionally, a method for manufacturing an exterior resin molded reed relay includes the steps of inserting a reed switch into the central cavity of a spool wrapped with an excitation coil;
A process of connecting the external terminal of the reed switch and the lead wire of the excitation coil to each lead piece of the lead frame, followed by a process of applying an exterior resin mold, and after this molding, cutting and separating each of the above lead pieces from the lead frame body. There are some that have a process. However, in this manufacturing method, during the exterior resin molding process, the reed relay in the molding die is displaced in the thickness direction of the lead frame due to mold pressure, causing variations in the thickness of the exterior resin and internal parts such as excitation coils. The disadvantage is that the displacement of the relay has to be added to the thickness of the exterior resin to make it thicker than necessary, thereby causing exposure of the exterior resin and cracking and blistering of the exterior resin.

This invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and an object of the present invention is to provide a method for manufacturing a reed relay that can keep the thickness of the exterior resin constant by simple means and avoid wasting the resin used. It is an object.

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

FIG. 1 shows an assembly process diagram of a reed relay. In this process drawing and the cross-sectional view in FIG. Fixed. External terminals 15 and 16 protruding from both ends of the reed switch 13 are connected to lead pieces 18 and 19 of the lead frame 17 by soldering or welding, and the other pair of lead pieces 20 and 21 of the lead frame 17 are connected to Lead wire 2 of excitation coil 11
2 and 23 are connected. The collar portions 24 and 25 integrally formed at both ends of the spool 10 include a third
As shown in the figure, protrusions 26 and 27 that protrude in the vertical direction
are provided for each.

External terminal 1 of reed switch 13 as described above.
5 and 16 to lead pieces 18 and 19, and excitation coil 1.
After connecting the lead wires 22 and 23 of 1 to the lead pieces 20 and 21, respectively, the relay exterior part 28 containing the excitation coil 11 and the collars 24 and 25 of the spool 10 is placed in a molding die 29 as shown in FIG. The mold is placed between the upper mold 30 and lower mold 31 and the mold is closed. At this time, the upper and lower protrusions 26, 27 of the collars 24, 15 of the spool 10 come into contact with the opposing surfaces 32, 33 of the upper mold 30 and lower mold 31, and the collars 24, 25 are moved between the opposing surfaces 32, 33. or this opposing surface 3
The protrusions 26 and 27 face the protrusions 2 and 33 with a slight gap between them. Thereafter, a resin such as epoxy is injected into the cavity 34 of the molding die 29 to form an exterior resin mold, and after this molding, each of the lead pieces 18, 19 and 20 of the lead frame 17,
21 is cut and separated from the lead frame main body 35. As a result, a reed relay 37 having an exterior resin 36 as shown in FIGS. 5 to 7 and from which each lead piece 18, 19 and 20, 21 protrudes is obtained.

In the above-mentioned exterior resin molding process, the flange portion 2 of the spool 10 is used to set the exterior resin thickness t in the thickness direction A of the lead frame 17 (see FIG. 6).
The protrusions 26 and 27 of 4 and 25 are the upper mold 30 and the lower mold 31
The reed relay 37 is positioned in the thickness direction of the lead frame 17 by contacting the opposing surfaces 32 and 33 thereof. Therefore, reed relay 37
is not displaced in the thickness direction of the lead frame 17 due to mold pressure. As a result, the thickness of the exterior resin 36 of the reed relay 37 is kept constant,
Waste of the resin used is eliminated, and the exposure of internal parts such as the excitation coil 11 and the cracking and blistering of the exterior resin 36 are prevented by using the minimum amount of resin.

On the other hand, each protrusion 26, 2 of the brim portion 24, 25
Although the tip of the spool 7 is exposed on the surface of the exterior resin 36 and affects the appearance, this influence can be avoided by setting the spool 10 to the same color as the exterior resin 36.

As explained above, according to the present invention, when molding the exterior resin of a reed relay, the collar of the excitation coil spool is positioned between the upper mold and the lower mold of the molding die using projections provided above and below the collar. By this means, it is possible to provide a method for manufacturing a reed relay in which the thickness of the exterior resin can be kept constant and waste of resin used can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the assembly process of a reed relay according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a side view of the spool, and FIG. Reed relay exterior resin molding process diagram,
5 is a front view of the reed relay, FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a sectional view taken along line 7-7 in FIG. DESCRIPTION OF SYMBOLS 10... Spool, 11... Excitation coil, 12... Central cavity, 13... Reed switch, 15, 16...
External terminal, 17... Lead frame, 18, 19...
Lead piece, 20, 21... Lead piece, 22, 23...
Leader line, 24, 25...Brim part, 26, 27...Protrusion, 29...Molding die, 30...Upper die, 31...Lower die,
35...Lead frame body, 37...Reed relay.

Claims (1)

[Claims] 1. A step of inserting a reed switch into the central cavity of the spool around which the excitation coil is wound, and connecting the external terminal of the reed switch and the lead wire of the excitation coil to each lead piece of the lead frame. In the method for manufacturing a reed relay, the method includes a step of applying an exterior resin mold, and a step of cutting and separating each of the lead pieces from the lead frame body after the molding. A method of manufacturing a reed relay, characterized in that the part is positioned between an upper mold and a lower mold of a molding die using protrusions provided above and below the reed relay. 2. The method for manufacturing a reed relay according to claim 1, wherein the spool has the same color as the exterior resin.