JPH0817681A - Surface mount electronic components - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a surface mount electronic component capable of easily bending a terminal member and minimizing a distance between an end face of a substrate and a tip of the terminal member. According to the present invention, a surface having a substrate 1 including electronic component elements and terminal members 40, 50 connected to the electronic component elements and having a substantially flat plate shape bent from the rear surface to the end surface of the substrate 1 is formed. In the mountable electronic component, the flat plate-shaped terminal members 40, 50 have bent protrusions 44, 54 formed in the vicinity of the bending line so as to substantially contact the back surface of the substrate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component surface-mounted on a printed wiring board, and more particularly to a surface-mounted electronic component capable of stably bending a terminal member.

[0002]

2. Description of the Related Art Generally, a surface mount type electronic component having a substrate including an electronic component element and a terminal member of a substantially flat plate which is connected to the electronic component element and is bent from a rear surface to an end surface of the substrate. An example is an open trimmer capacitor.

Specifically, as shown in FIGS. 5 and 6, it is composed of a stator substrate 1, a dielectric rotor 2, adjusting pins 3, a stator metal fitting 4 embedded in the stator substrate 1, and a rotor metal fitting 5. It was

The stator substrate 1 is made of, for example, a heat resistant resin, and a through hole 11 is formed in the central portion thereof, and a recess 12 is formed around the opening of the through hole 11 on the back surface side. A part of the stator metal fitting 4 is embedded in the stator substrate 1, and a horseshoe-shaped stator electrode 4 a that is a part of the stator metal fitting 4 is exposed on the surface of the substrate 1.

A part of the stator metal fitting 4 extends outward from the rear surface of the substrate 1 and is led out to one end face along the rear surface of the substrate 1. The portion that extends outward from the back surface of the substrate 1 is referred to as a stator terminal member 40.

The stator terminal member 40 comprises an intermediate portion 41 extending along the back surface of the substrate 1 and a tip portion 42 bent in a direction along the end face of the substrate 1. The boundary portion between the intermediate portion 41 and the tip portion 42 is referred to as a folding curve portion 43.

The dielectric rotor 2 is composed of a substantially disk-shaped laminated dielectric porcelain having a through hole 21 formed in the center thereof, and a semi-circular rotor electrode 2a is formed therein, and the rotor electrode 2a is formed.
Is partially led out to the through hole 21. A conductor film 22 electrically connected to the rotor electrode 2a is formed on the inner wall of the through hole 21 of the rotor.

The adjusting pin 3 is made of a metal member or the like, and has a disk-shaped head portion 31 in which an adjusting groove 33 is formed, and the pin portion 3.
Have two. The adjustment pin 3 is for rotatably fixing the dielectric rotor 2 arranged on the stator substrate 1. Specifically, the adjustment pin 3 is a pin in the through hole 21 of the dielectric rotor 2 and the through hole 11 of the stator substrate 1. The substrate 1 is inserted through the portion 32.
In the concave portion 12 on the back surface side, the caulking process is performed via a part of the rotor fitting 5.

The rotor fitting 5 is a recess 1 of the stator substrate 1.
2, the crimp receiving portion 5a of the pin portion 32 of the adjusting pin 3 and the intermediate portion 51 extending from the crimp receiving portion 5a along the back surface of the substrate 1 to the other end surface of the substrate 1; 1 and a front end portion 52 that is bent in a direction along the end surface of the first.
The boundary portion between the intermediate portion 51 and the tip portion 52 is referred to as a bent curve portion 53, and the intermediate portion 51 and the tip portion 52 are collectively referred to as a rotor terminal member 50.

Bending of the stator terminal member 40 and the rotor terminal member 50 as described above is performed as shown in FIGS. 7 (a) and 7 (b). In the drawing, the stator terminal member 40 side is used for description.

As shown in FIG. 7A, the terminal member 40
Are arranged so as to be horizontally led out from the back surface of the substrate 1 in the end face direction.

Next, as shown in FIG. 7B, the bending fulcrum member 7 is brought into contact with the folding curve portion 43 of the terminal member 40 along the end face of the substrate 1. Next, while the bending fulcrum member 7 is brought into contact with the terminal member 40, the tip end portion 42 of the terminal member 40 is
Is bent in the direction of the arrow in the drawing and raised so as to contact the end face of the substrate 1.

[0013]

However, in the surface mount type electronic component (trimmer capacitor) having the above-mentioned structure, the tip end portions 42 and 52 of the terminal members 40 and 50 and the substrate 1 are provided.
There is a problem that the distance between the end member and the end face becomes large and the bending process of the terminal members 40 and 50 becomes complicated.

That is, in order to bend the terminal members 40 and 50 while interposing the bending fulcrum member 7, the end portions 42 and 52 of the bent terminal members 40 and 50 and the end face of the substrate 1 are formed. A space corresponding to the thickness of the bending fulcrum member 7 is formed between them. Although it is conceivable to reduce the thickness of the bending fulcrum member 7 in order to narrow this interval, the rigidity of the bending fulcrum member 7 is reduced, and stable bending cannot be performed. The life of the fulcrum member 7 is shortened.

Further, the tip end portions 42 of the terminal members 40 and 50,
Since the distance between 52 and the end face of the substrate 1 becomes large, the shape of the electronic component becomes large.

In the trimmer capacitor of FIG. 5, in order to suppress the enlargement of the shape of the electronic component, the notch 13,
13 is formed. Since the substrate 1 has a simple structure, the notches 13 and 13 can be formed.
When the substrate 1 is further miniaturized, the cut portions 13, 13 cannot be formed substantially.

The present invention has been devised in view of the above problems, and an object thereof is to easily bend a terminal member and to minimize the distance between the end face of the substrate and the tip of the terminal member. An object of the present invention is to provide a surface mount electronic component that can be manufactured.

[0018]

The present invention provides a surface mount type electronic component having a substrate including an electronic component element and a terminal member connected to the electronic component element and led out from the back surface to the end surface of the substrate, The flat plate-shaped terminal member is a surface-mounted electronic component in which bent protrusions that come into contact with the back surface of the substrate are formed near corners between the back surface and the end surface of the board.

[0019]

According to the present invention, the plate-like terminal member is formed with the bent protrusion which substantially abuts the back surface of the substrate in the vicinity of the bent portion. Therefore, when bending the tip end portion of the terminal member that is drawn out horizontally from the back surface of the substrate horizontally, simply bending the tip end of the terminal member without interposing a bending fulcrum member as in the conventional case, The bent protrusion contacts the back surface of the substrate, and this bent protrusion serves as a fulcrum during bending, so that the terminal member can be easily bent to the end face of the substrate.

Even if the bending fulcrum member is not used, the bent portion is regulated by the bent protruding portion and substantially becomes the boundary portion on the tip side of the bent protruding portion, so that bending at a stable position is possible. Become.

Further, since a bending fulcrum member unlike the conventional case is not interposed between the end face of the substrate and the bent terminal member, a gap for interposing the bending fulcrum member is substantially eliminated. The shape of the electronic component can be reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface mount type electronic component of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an open type trimmer capacitor which is an example of the surface mount type electronic component of the present invention. The same parts as those in FIGS. 5 and 6 are described with the same reference numerals.

The trimmer capacitor is the stator substrate 1
, Dielectric rotor 2, adjusting pin 3, stator metal fitting 4
And the rotor fitting 5 are mainly configured.

The stator substrate 1 has a substantially rectangular parallelepiped shape made of resin. A through hole 11 into which the pin portion 32 of the adjustment pin 3 is inserted is formed in the center of the stator substrate 1. At the opening of the through hole 11 on the bottom surface of the stator substrate 1, a concave portion 12 is provided in which the caulking portion at the tip of the adjustment pin 3 is housed.
Are formed. In addition, a stator metal fitting 4 including a stator electrode 4a and a stator terminal member 40 is embedded in the stator substrate 1.

The stator metal fitting 4 is a metal member having a substantially flat plate shape, and is extended to the stator electrode 4a exposed on the surface of the substrate 1 and the back surface side of the stator substrate 1, and along the back surface of the substrate 1 in the direction of one end surface. It is composed of an extending intermediate portion 41 and a bent tip portion 42. Incidentally, this intermediate portion 41
And the tip 42 are collectively referred to as a stator terminal member 40.

The stator substrate 1 having such a complicated shape
Is formed by resin molding, but at the same time, the stator fitting 4 is integrally formed so as to be embedded in a predetermined portion.

The dielectric rotor 2 is in the form of a disc made of a predetermined dielectric material, and a through hole 21 through which the pin portion 32 of the adjusting pin 3 is inserted is formed in the center thereof. A semi-circular rotor electrode 2a is formed inside the dielectric rotor 2. A part of the rotor electrode 2a appears in the through hole 21, and the rotor lead conductor film 22 is formed on the inner wall of the through hole 21 and the upper surface of the dielectric rotor 2. In such a dielectric rotor 2, a dielectric green sheet and a dielectric green sheet on which a pattern of Pd and Ag-Pd to be the rotor electrode 2a is printed are laminated to form a hole to be the through hole 21. Then, a pattern to be the rotor lead-out conductor film 22 is printed and finally sintered.

The adjusting pin 3 is composed of a metal member and has a head portion 31 having an adjusting groove 33 formed on the surface thereof, and a pin portion 32 hanging from the head portion. The pin portion 32 is inserted into the through hole 21 of the dielectric rotor 2 and the through hole 11 of the stator substrate 1, and further the rotor fitting 5 described later.
The caulking process is performed via the caulking receiving portion 5a.

The rotor fitting 5 is made of a substantially flat metal member having elasticity, and one end of the rotor fitting 5 is a recess 1 of the stator substrate 1.
The pin portion 32 of the adjustment pin 3 is inserted at 2, and the crimping receiving portion 5a and the crimping receiving portion 5 are joined by the crimping process.
The terminal member 50 extends from a to the other end surface of the substrate 1 along the back surface of the substrate 1. The terminal member 50
Is composed of an intermediate portion 51 arranged substantially along the back surface of the insulating substrate 1 and a bent tip portion 52.

In the trimmer capacitor having the above structure, when the adjusting pin 3 is rotated by a predetermined amount, the stator electrode 4
The facing area between a and the rotor electrode 2a changes, and a capacitance that changes in proportion to the facing area is obtained between the stator terminal member 40 and the rotor terminal member 50.

Here, the electronic component elements are the stator electrode 4a, the rotor electrode 2a, the dielectric rotor 2, and the adjusting pin 3.
The substrate substantially corresponds to the stator substrate 1, and the bent plate-like terminal member corresponds to the stator terminal member 40 and the rotor terminal member 50.

A characteristic of the present invention is that the bent projecting portions 44, 54 are provided in the vicinity of the bent curved portions 43, 53 of the stator terminal member 40 and the rotor terminal member 50, which are bent plate-like terminal members. Is formed.

FIG. 2 is an enlarged view of a tip portion of a stator terminal member 40, which is a terminal member, for example.

Specifically, for example, the stator terminal has a bent portion 4 corresponding to the ridgeline between the back surface and the end surface of the substrate 1.
3, the substrate 1 is bent from the back surface to the end surface in a direction substantially at right angles. The portion that is bent as described above and corresponds to the end surface of the substrate 1 is the tip portion 42.
The portion along the back surface of is the intermediate portion 41.

A bent protrusion 44 is formed at a position of the intermediate portion 41 of the stator terminal member 40, which is in contact with the folding curve portion 43, so as to come into contact with the back surface of the substrate 1 during bending.

FIG. 3 shows the stator terminal member 4 as described above.
It is a partial top view of the 0 expanded state. The terminal width increases from the intermediate portion 41 to the tip portion 42 so as to come into contact with the folding curve portion. The widened portion 45 becomes the bent protruding portion 44.

That is, in the actual terminal member 40, the root portion X of the expanded portion 45 is bent in a substantially vertical direction on the front surface side of the substrate 1 (the direction in which it abuts the back surface of the substrate) to form the bent protrusion portion 44. To do.

In the terminal member 40 having such a bent protrusion portion 44, as a method for forming an actual terminal member structure, as shown in FIG. 4A, first, the bent portion 44 is formed as described above. The terminal member 40 included therein is arranged on the back surface of the substrate 1. The stator terminal member 40 is integrated when the substrate 1 is molded, and the rotor terminal member 50 is held by the caulking receiving portion 5a.

At this time, the tip portion 42 of the terminal member 40 extends outward from the end surface of the substrate 1.

Next, as shown in FIG. 4B, the terminal member 4
Bending is performed upward in the direction of the arrow in the figure so that the tip portion 42 of 0 extending from the end surface of the substrate 1 contacts the end surface of the substrate 1.

At this time, since the bent protrusion 44 which is wider and is bent near the boundary with the tip of the intermediate portion 41 is formed, the bent protrusion 44 does not bend. That is, the portion that is actually bent is bent near the boundary of the end portion on the tip end side of the bending protrusion 44, and the bending of the bending curve portion 43 is small and the bending can be performed at a stable position.

When the tip 42 is bent upward, the bent protrusion 44 comes into contact with the back surface of the substrate 1, and the bent protrusion 44 serves as a fulcrum during bending.
A stable bending process can be performed. The bent protrusion 4
It is not necessary for all 4 to come into contact with the back surface of the substrate 1, and only a portion thereof should come into contact with the back surface of the substrate 1.

Further, when the tip end portion 42 of the terminal member 40 is bent, the bending fulcrum member 7 is not interposed unlike the prior art, so that the tip end portion 42 of the terminal member 40 and the substrate 1 are bent. An unnecessary gap (a gap corresponding to the thickness of the bending fulcrum member 7) with the end surface of the is not formed.

Therefore, the bending fulcrum member for stably performing the bending as in the prior art is unnecessary, and the terminal member 40 is directly connected.
Since the tip portion of the terminal is bent, the bending is very easy and the bent portion is stable, and the terminal member 40
It is possible to minimize the gap between the front end portion 42 and the end surface of the substrate 1, and to reduce the size of the electronic component as a whole.

In the description of the terminal member 40 of the above-mentioned embodiment, the stator terminal member side has been described, but the rotor terminal member side can be similarly applied. Further, it may be used for either the stator terminal member or the rotor terminal member.

Further, although the open type trimmer capacitor has been described as an example of the surface mount type electronic component, the invention is not limited to the trimmer capacitor, but can be applied to all electronic components in which the terminal electrode is led out from the back surface.

[0047]

As described above, in the surface mount type electronic component of the present invention, since the bent protrusion is formed in the portion which abuts the back surface of the terminal member, when the terminal member is bent from the back surface toward the end surface, it is bent. It can be easily bent at the boundary portion on the tip side of the terminal member.

Further, since it is not necessary to interpose a bending fulcrum member or the like between the tip of the terminal member and the end face of the substrate, the unnecessary gap between the tip of the terminal member and the end face of the substrate should be minimized. This can contribute to downsizing of surface mount electronic components.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an open type trimmer capacitor which is an example of a surface mount electronic component of the present invention.

FIG. 2 is an enlarged view of a tip portion of a stator terminal that is a terminal member.

FIG. 3 is a partial plan view showing a state in which an intermediate portion and a tip portion of a stator terminal, which is a terminal member, are developed.

4A and 4B are schematic diagrams for explaining bending processing.

FIG. 5 is a perspective view of a conventional trimmer capacitor.

FIG. 6 is a sectional view of a conventional trimmer capacitor.

7A and 7B are schematic views for explaining bending of a terminal member of a conventional trimmer capacitor.

[Explanation of symbols]

 1-stator substrate 11-through hole 12-recess 4-stator metal fitting 4a-stator electrode 40-stator terminal member 41-intermediate Part 42 ... Tip part 43 ... Folded curve part 44 ... Bending protrusion 2 ... Dielectric rotor 21 ... Through hole 22 ... Rotor electrode 3 ...・ ・ ・ ・ Adjustment pin 31 ・ ・ ・ Head part 32 ・ ・ ・ Pin part 5 ・ ・ ・ Rotor metal fitting 50 ・ ・ ・ ・ Rotor terminal member 51 ・ ・ ・ ・ Intermediate part 52 ・ ・ ・ ・Tip part 53 ... Bending curve part 54 ... Bending projection

Claims (1)

[Claims] 1. A surface mount electronic component, comprising: a substrate including an electronic component element; and a terminal member connected to the electronic component element and led out from a back surface to an end surface of the substrate, wherein the terminal member is a back surface of the substrate. A surface mount type electronic component, characterized in that a bent protrusion that abuts on the back surface of the substrate is formed in the vicinity of a corner with the end face.