JPH10256033A - Electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bending angle from scattering by forming a narrow part at the bending position of a terminal. SOLUTION: A base block is formed at an electromagnet block 10 that is connected to a lead frame 50 by secondary formation. A common terminal 21, fixed contact terminals 22 and 23, and a coil terminal 24 are cut and flexed at the lead frame 50. Narrow parts 22b and 23b (21b and 24b are not shown) are formed at the base part of terminals 21-24 projecting from the side surface of the base block. When the terminals 21-24 are curved downward, it can be bent with a high dimension accuracy from a specific position even without using a mold for forming a reference surface, thus preventing a flex position from scattering. When the thickness dimension of the terminals 21-24 is 0.15mm, a distance from the side surface of the base block before flex to the narrow parts 21b-24b may be 0-0.05mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component, and more particularly to an electronic component in which a terminal protruding from a housing is bent in a thickness direction.

[0002]

2. Description of the Related Art Conventionally, as an electronic component, for example, a terminal protruding from a side surface of a box-shaped base is bent at a substantially right angle in a plate thickness direction, such as a small electromagnetic relay. However, with the miniaturization of the electromagnetic relay, it is not easy to use a mold serving as a reference surface, so that it is not easy to bend the terminal at a substantially right angle. For this reason, the side wall of the base is used as a substitute for the mold, and the terminal is bent along the side wall of the base.

[0003]

However, in the above-mentioned electronic component, since the side wall of the base, which is a resin molded product, is used as a substitute for the mold, the bending angle tends to vary. Also, the bending angle tends to vary due to the variation in dimensional accuracy caused by resin molding. For this reason, for example, when a box-shaped case is fitted in a later process, there is a problem that the case cannot be assembled.

[0004] In view of the above problems, it is an object of the present invention to provide an electronic component in which a bending angle of a terminal protruding from a housing does not vary.

[0005]

In order to achieve the above object, an electronic component according to the present invention is characterized in that a terminal protruding from a housing is bent from its base in a plate thickness direction. It has a configuration in which a portion is formed.

The distance from the surface of the housing to the narrow portion before bending is 0 to 0.05 mm.
It may be set as.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment according to the present invention will be described with reference to FIGS. That is, the present embodiment is applied to an electromagnetic relay,
Generally, the base block 20 formed by subjecting the electromagnet block 10 to secondary molding, the movable block 30, and the case 4
0.

As shown in FIGS. 3B and 4, the electromagnet block 10 has a coil 1 attached to a substantially U-shaped iron core 11.
6 is wound. As a method of manufacturing the electromagnet block 10, as shown in FIG. 5, first, a substantially U-shaped iron core 11 is subjected to primary molding to form a spool 12.
The spool 12 includes flanges 13 and 14 formed on both ends of the iron core 11, respectively. A pair of connecting pieces 18 protruding from both side surfaces of the flange 14 extend along the axial direction. Further, a coil 16 is wound around an intermediate portion of the iron core 11, and the lead wire is connected to the flange 1
3 of the relay terminal 17 which is insert-molded into
And soldered (Fig. 6).

The base block 20 is formed by subjecting the electromagnet block 10 connected to the lead frame 50 to secondary molding, as shown in FIGS.
In the lead frame 50, the common terminal 21, the fixed contact terminals 22, 23, and the coil terminal 24 are cut out and bent, and the support piece 51 is cut out and bent. However, the fixed contact terminals 22 and 23 are provided with fixed contacts 22a and 23a, respectively.

The relay terminal 1 of the electromagnet block 10
7 is welded and integrated with the free end of the coil terminal 24 of the lead frame 50, and the connecting piece 18 is welded and integrated with the support piece 51 of the lead frame 50, and then these are positioned in a mold to perform secondary molding. I do. However, the base block 20 is completed by cutting the connecting piece 18 from the lead frame 50 and cutting and bending each of the terminals 21 to 24. At this time, the terminals 21 to 24
Is substantially flush with the outer surface of the base block 20.

Each of the terminals 21 to 24 projecting from the side surface of the base block 20 has narrow portions 21b, 22b, 23 at its base as shown in FIGS. 8 (b) and 8 (c), for example.
b, 24b (the narrow portions 21b, 24b are not shown). Therefore, when the terminals 21 to 24 are bent downward, the terminals 21 to 24 can be bent with high dimensional accuracy from a predetermined position without using a mold for forming a reference surface, and the bending positions do not vary. As a result, the terminals 21 to 24 are fitted into the shallow grooves provided on the outer surface of the base block 20, and these outer surfaces are substantially flush. When the thickness of each of the terminals 21 to 24 is, for example, 0.15 mm, each of the narrow portions 21 b to 24 from the side surface of the base block 20 before bending.
The distance to b may be 0 to 0.05 mm.

As shown in FIG. 1, the base block 20 obtained by the above-mentioned secondary molding has a shallow recess 25 on the upper surface thereof. Protrusions 26a and 26b are protruded. One convex part 26
“a” has a long ridgeline such that the top thereof is in line contact with a movable block 30 described later. The other convex portion 26b is
In order to absorb variations in dimensional accuracy in the width direction, the protrusion 26
It has a ridge top that is shorter than a.

A fixed contact terminal 2 is provided at a corner of the recess 25.
2, 23 fixed contacts 22a and 23a are respectively exposed. The magnetic pole portions 11a and 11b of the iron core 11 are exposed between the adjacent fixed contacts 22a and 22a and between the adjacent fixed contacts 23a and 23a, respectively.
Further, the magnetic pole portions 11a and 11b of the iron core 11 are separated from the fixed contacts 22a and 23a by insulating walls 27 having a substantially U-shaped plane. The outer side surface of the insulating wall 27 facing itself is a tapered surface (FIG. 4). The connection receiving portion 21a of the common terminal 21 is exposed from the corner of the opening edge of the base block 20 substantially at the center of the side.

As shown in FIGS. 1 and 2, a projection 28 projects from the center of both end faces of the base block 20. As shown in FIG. As shown in FIG. 3B, the protrusion 28
The connecting piece 18, the fixed contact terminal 23, and the coil terminal 24 protrude forward from the uncut ends 18a, 23c, and 24c. This is to prevent, for example, the end portion 23c and the end portion 24c from climbing over or catching with each other when the base block 20 is continuously transported.

The base block 20 does not need to be limited to the above-described one, and may be, for example, one provided with substantially L-shaped insulating walls 27, 27 as shown in FIG.

The movable block 30 is shown in FIG.
As shown in (b), the movable contact pieces 32, 32 are arranged on both sides of the permanent magnet 31 and the movable iron piece 33 is overlapped on one surface of the permanent magnet 31, and then the insulating table 34 is formed by resin molding. And integrated.

The permanent magnet 31 is narrower than the movable iron piece 33, and is superposed on the so-called drooping surface of the movable iron piece 33. This is to prevent the permanent magnet 31 from contacting the so-called burr generated when the movable iron piece 33 is subjected to press working, so that no gap is generated between the two.

Further, after partially fixing the edge of the joint surface between the permanent magnet 31 and the movable iron piece 33, resin molding may be performed. As the temporary fixing method, for example, an existing method such as laser welding, welding with a gas burner, spot welding, or the like can be used. Alternatively, a joining metal thin film formed on a joining surface of both may be melted and integrated. As a metal thin film for bonding,
For example, a simple substance such as nickel, zinc, cadmium, tin, copper, chromium, lead, silver, gold, and palladium or an alloy thereof may be used. In addition, as a method for forming the bonding metal thin film, existing methods such as plating, vapor deposition, and coating can be selected. Further, the bonding metal thin film may be formed on the entire bonding surface, or may be formed only on the edge of the bonding surface or only on the center. Examples of the method for melting the bonding metal thin film include laser irradiation, heating using a gas burner, and an existing heating method using electric resistance.

The movable contact piece 32 is formed by punching a conductive thin plate spring material. Movable contacts 32a and 32b are provided on each of the divided pieces formed at both ends by being divided in the width direction. . Further, the movable contact piece 32 has a substantially T-shaped connecting portion 32c extending laterally from a substantially central portion of the side.

As a method of forming the movable block 30, for example, after the movable contacts 32a and 32b are provided, the movable contact pieces 32 and 32 cut out from a lead frame (not shown) by press working are positioned in a mold. Next, there is a method in which the temporarily fixed permanent magnet 31 and the movable iron piece 33 are positioned in the mold, and then integrated by an insulating table 34 formed of a resin mold. The movable iron piece 33 has the same configuration as that of the iron core 11 except for a portion in contact with the magnetic pole portions 11a and 11b.
The entire surface may be resin-molded to enhance the insulating properties.

Then, the movable block 30 is dropped into the base block 20 from above, and a pair of recesses 34a, 34b (FIG. 2) provided on the lower surface of the insulating base 34 is formed on the upper surface of the base block 30 by a convex portion 26a. , 26b are automatically positioned. Further, the connection portion 32c of the movable contact piece 32 is connected to the connection receiving portion 2 of the common terminal 21.
The movable block 30 is rotatably supported by welding to 1a.

In this embodiment, the concave portions 34 a and 34 b provided on the lower surface of the insulating base 34 are
a and 26b to be fitted and supported. For example, even if the distance between the convex portions 26a and 26b has a variation due to the processing tolerance, the ridgeline at the top of the convex portion 26b is shorter than that of the convex portion 26a, and the variation in the processing tolerance can be absorbed. Therefore, it is possible to avoid a malfunction due to a variation in processing tolerance. Also, the concave portion 34 of the insulating table 34
a, 34b and the convex portions 26a, 26 of the base block 20.
The contact portion with b is located on substantially the same plane as the connecting portion 32c serving as the rotation axis. For this reason, there is no play due to the variation of the rotation axis, and a smooth rotation can be obtained.

In this embodiment, two convex portions 26 are provided.
Although the case where a and 26b are formed has been described, the present invention is not limited to this, and one or two or more may be formed. The shape of the projections 26a and 26b is not limited to the above-described one, and the top may be a triangular prism, a cone, or a hemisphere. Furthermore, while the tops of the protrusions 26a and 26b are formed to have an acute angle, and the bottoms of the recesses 34a and 34b are formed to have an obtuse angle, it is possible to provide a structure in which the rotation fulcrum hardly rattles.

Then, as a result of assembling the movable block 30 to the base block 20, as shown in FIG. 11, a substantially U-shaped insulating wall 27 separates the movable iron piece 33 and the movable contact piece 32. For this reason, the creepage distance between the two becomes long, and the insulation characteristics are high. Further, both ends 34 of the insulating table 34
c and 34 d extend long and overlap the insulating wall 27. For this reason, the extension distance between the two becomes even longer,
There is an advantage that the insulation characteristics are improved.

As shown in FIG. 1, the case 40 has a box shape that can be fitted to the base block 20, and has a notch 41 for fitting formed at the opening edge thereof. Also,
The case 40 has a gas vent hole 42 at the edge of the ceiling surface. Further, as shown in FIG. 13, the case 40 has an insulating rib 43 protruding from a ceiling surface thereof. One end of the insulating rib 43 is continuous with the inner surface of the case 40, and the joining surface joining the insulating wall 27 of the base block 20 is a tapered surface.

Then, the case 40 is attached to the base block 20 to which the movable block 30 is attached, and the terminal 2
The notches 41 are fitted to the respective 1 to 24. As a result, as shown in FIG.
Abuts against the outer surface of the insulating wall 27 provided on the base block 20. For this reason, the creepage distance between the two becomes longer,
The insulation properties are improved. Also, since the joining surfaces of both the insulating wall 27 and the insulating rib 43 are tapered surfaces,
There is an advantage that smooth assembling is possible and the assembling work is facilitated. Note that the insulating ribs 43 may be in contact with the opposing inner surfaces of the insulating wall 27.

Next, the base block 20 and the case 40
After sealing the joint surface with the gas vent hole 4 of the case 40,
The assembly operation is completed by extracting the internal gas from 2 and thermally sealing the gas vent hole 42.

Next, the operation of the electromagnetic relay having the above-described structure will be described. First, when no voltage is applied to the coil 16 of the electromagnet block 10, one end 33a of the movable iron piece 33 is attracted to the magnetic pole part 11a of the iron core 11 by the magnetic force of the magnetic flux of the permanent magnet 31, and the magnetic circuit is closed. And the movable contact 32a of the movable contact piece 32 is in contact with the fixed contact 22a.

When a voltage is applied to the coil 16 of the electromagnet block 10 so that a magnetic flux for canceling the magnetic flux of the permanent magnet 31 is generated, the movable iron piece 33 rotates against the magnetic force of the permanent magnet 31, and The movable contact piece 32 rotates. For this reason, after the movable contact 32a is separated from the fixed contact 22a, the movable contact 32b contacts the fixed contact 23a, and the other end 33b of the movable iron piece 33 is connected to the magnetic pole 1 of the iron core 11.
Adsorb to 1b. And even if the application of the above-mentioned voltage is released, the movable block 30
Hold that state.

Further, when a voltage in the opposite direction to the above-described application direction is applied to the coil 16, the coil 16 resists the magnetic force of the permanent magnet 31,
The movable iron piece 33 rotates in the direction opposite to the above-described rotation direction, and accordingly, the movable contact piece 32 also rotates. Therefore, the movable contact 32b is separated from the fixed contact 23a, and the movable contact 32a
After contacting with the fixed contact 22a, one end 33a of the movable iron piece 33 is attracted to the magnetic pole portion 11a of the iron core 11 and returns to the original state.

In the above embodiment, the self-holding type electromagnetic relay has been described. However, the present invention is not limited to this.
Needless to say, the present invention may be applied to a self-recovering type electromagnetic relay.

According to the present embodiment, the case where the present invention is applied to an electromagnetic relay has been described. However, the present invention is not limited to this, and it goes without saying that the present invention may be applied to other electronic components such as switches.

[0033]

As is clear from the above description, according to the electronic component of the first aspect of the present invention, a narrow portion is formed at the bent position of the terminal. Therefore, when the protruding terminal is bent in the thickness direction, the terminal always bends around the narrow portion. For this reason, the terminal is bent accurately in proportion to the bending moment based on the applied load, and there is no variation in the bending angle unlike the conventional example. As a result, the assembling work of the box shape or the like in the subsequent process becomes easy, and the workability is improved. According to the second aspect, the distance from the surface of the housing to the narrow portion before bending is set to 0 to 0.05 mm. Because of this,
In addition, even when a narrow terminal is bent, there is an effect that the terminal can be accurately bent from the end of the narrow portion on the housing side.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electromagnetic relay of FIG. 1 when viewed from below.

3A and 3B show a state after assembling the electromagnetic relay shown in FIG. 1, wherein FIG. 3A is a partial plan view and FIG. 3B is a partial front view.

FIG. 4 is a side sectional view of the electromagnetic relay shown in FIG.

5A and 5B show an iron core in which a spool is integrally formed. FIG. 5A is a perspective view seen from above, and FIG. 5B is a perspective view seen from below.

6A and 6B show an electromagnet block, wherein FIG. 6A is a perspective view seen from above, and FIG. 6B is a perspective view seen from below.

FIG. 7 is a perspective view for explaining a secondary molding method of the electromagnet block.

8A and 8B show a secondary molding method of an electromagnet block, wherein FIG. 8A is a plan view, and FIGS. 8B and 8C are enlarged plan views of a main part.

FIG. 9 shows a secondary molding method of the electromagnet block, wherein FIG. 9 (a) is a side view and FIG. 9 (b) is a front view.

FIG. 10 is an exploded perspective view of the movable block before resin molding, in which FIG. 10A is an exploded perspective view seen from above, and FIG. 10B is an exploded perspective view seen from below.

FIG. 11 is a perspective view showing a state where a movable block is assembled to a base block.

12A and 12B show another embodiment of the base block, wherein FIG. 12A is a perspective view and FIG. 12B is a plan view.

FIG. 13 is a perspective view in which a case is turned upside down and a part is cut away.

[Explanation of symbols]

10: electromagnet block, 11: iron core, 11a, 11b ...
Magnetic pole part, 12 ... spool, 13, 14 ... flange part, 16 ... coil, 17 ... relay terminal, 18 ... connecting piece, 18a ... end part,
Reference numeral 20: base block, 21: common terminal, 21a: connection receiving portion, 21b: narrow portion, 22, 23: fixed contact terminal,
22a, 23a: fixed contact, 22b, 23b: narrow portion,
22c, 23c: end, 24: coil terminal, 24b: narrow, 24c: end, 25: recess, 26a, 26b: convex, 27: insulating wall, 28: projection, 30: movable block,
31: permanent magnet, 32: movable contact piece, 32a, 32b ...
Movable contact point, 32c: connection portion, 33: movable iron piece, 34: insulating table, 34a, 34b: concave portion, 34c, 34d: end portion,
40 ... case, 41 ... notch, 42 ... gas vent hole,
43: an insulating rib, 50: a lead frame, 51: a support piece.

Claims (2)

[Claims] 1. An electronic component in which a terminal protruding from a housing is bent from its base in a plate thickness direction, wherein a narrow portion is formed at a bending position of the terminal. 2. The electronic component according to claim 1, wherein the distance from the surface of the housing to the narrow portion before bending is 0 to 0.05 mm.