JP3018758B2 - Fixing device for electronic components for printed circuit boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet which is inserted into a through hole formed in a printed circuit board on which a printed wiring is formed, and is attached to the lead terminal of the electronic component and the printed wiring which are inserted through the eyelet. The present invention relates to a device for fixing printed circuit board electronic components to be soldered.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a conventional fixing device for electronic parts for printed circuit boards. FIG.
A conventional fixing device shown in FIG. 6 is a printed circuit board 1 having a wiring copper foil 101 as a printed wiring formed on a surface thereof.
02, a through hole 103 penetrating through the wiring copper foil 101 is provided,
A brass eyelet 104 in which a flange 104a is provided at one end of the body from the component mounting surface 102a side in the through hole 103.
Is inserted into the through-hole 103 from the other end of the body, and the other end of the body is caulked and inverted so that the tip of the inverted portion 104b is brought into close contact with the wiring copper foil 101. In addition, a plurality of (six in this example) slits 104c are provided in the inversion portion 104b in order to make it easy for the solder 105 to enter.

To mount electronic components using such a fixing device, first, the component mounting surface 10 of the printed circuit board 102 is mounted.
When the lead terminal 106 of the electronic component (not shown) is inserted into the eyelet 104 from the side 2a, and the back surface 102b is immersed in a solder bath or the like in this state, the solder 10 as shown in FIG.
5 mechanically and electrically connects the wiring copper foil 101 and the lead terminals 106 via the eyelets 104.

However, in the above fixing device, the radius of curvature of the inverted portion 104b of the eyelet 104 is small, and the slit 10
Since the width of 4c is small, the solder cannot sufficiently enter the inside of the inverted portion 104b, and the connection between the wiring copper foil 101 and the eyelet 104 is mainly at only the outer surface of the inverted portion 104b. For this reason, cracks may occur due to expansion and contraction of the printed circuit board 102 due to temperature changes, and there has been a problem that sufficient reliability cannot be ensured.

Therefore, there is a fixing device configured as shown in FIGS. 7 and 8. 7 and 8, the same reference numerals as those in FIGS. 5 and 6 denote the same components as those in FIGS. 5 and 6. In the fixing structure shown in FIGS. 7 and 8, the plurality of inversion portions 104 b having the slits 104 c are attached to the adhesion inversion portion 104 d which holds the wiring copper foil 101 with a small radius of curvature, and the inclination angle is 3 degrees.
It is formed by caulking so as to alternately form the opening inverting portions 104e of 0 to 40 degrees.

In the case of this structure, the opening inversion portion 104e
Because a large gap is formed between the wiring copper foil 101 and the wiring copper foil 101, the molten solder 105 easily penetrates between them, and the connection between the wiring copper foil 101 and the eyelet 104 is ensured.

[0007]

However, in the conventional fixing structure shown in FIGS.
And the opening inversion portion 104e are provided alternately, and the solder 105 cannot enter between the adhesion inversion portion 104d and the wiring copper foil 101, so that the soldering is not always sufficient. In addition, the opening inversion portion 104e has a tilt angle of 30 to
Since it is formed at 40 degrees, as shown in FIG. 9, the distance H between the tip of the opening reversal portion 104 e and the back surface 102 b of the printed circuit board 102 increases. Therefore, for example, when mounting an electronic component, the lead terminal 106 is connected to the eyelet 1
In the case of performing clinching (bending) after inserting the lead through the 04, there is a problem that the required amount of bending cannot be performed due to the large distance H, and the lead components are not sufficiently soldered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to improve the reliability of soldering and to improve the reliability even when clinching is performed after inserting a lead terminal into an eyelet. An object of the present invention is to provide an electronic component fixing device for a printed circuit board having a structure that facilitates processing.

[0009]

According to the present invention, there is provided an apparatus for fixing an electronic component for a printed circuit board, comprising:
An eyelet provided with a plurality of cuts at an end thereof is inserted, and the cut pieces divided into a plurality of pieces by the cuts are respectively caulked and fixed to the printed circuit board, and a lead terminal of the electronic component inserted into the eyelet and the printed wiring are provided. Is soldered through the eyelets, and one end of each of the cut pieces in the direction along the circumference contacts the printed circuit board.
Away from the printed circuit board toward the other end
It is provided so as to be inclined. Further, in order to apply the caulking force on the caulking fixed side to the printed board surface averagely, the plurality of cut pieces may be provided to be inclined in the same direction. Further, the cut of the eyelet is provided only at one end, and at the other end, a flange is formed at a substantially right angle from the trunk of the eyelet, and the flange is brought into close contact with the printed circuit board surface. When attached, stable caulking becomes possible.

[0010]

According to this structure, since the cut pieces are provided inclined, a gap is formed between the cut piece and the printed board surface toward the upper side of the inclined portion. Since the eyelets are sufficiently soldered, the occurrence of cracks or the like due to the temperature change is eliminated.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 4 are enlarged views of a main part of a fixing device for an electronic component for a printed circuit board according to an embodiment of the present invention. FIG. 1 is a side view showing a state before lead terminals are attached. FIG. 3 is a plan view showing a state before the lead terminals are attached, as viewed from the back side, FIG. 3 is a sectional view showing the state where the lead terminals are attached, and FIG. 4 is a sectional view showing the same state where the lead terminals are attached.

The fixing device shown in FIGS. 1 to 4 is provided with a through-hole 3 penetrating the wiring copper foil 1 on a printed circuit board 2 having a wiring copper foil 1 as a printed wiring formed on a surface thereof. From the component mounting surface 2a side, a brass eyelet 4 having a flange-like portion 4a extending substantially perpendicular to the body at one end of the body is inserted through the other end of the body, and the other end of the body is inserted. It has a schematic structure in which the tip of a cut piece 4b formed by caulking and inverting is in close contact with the copper foil 1 for wiring.

More specifically, the cut piece 4b has a plurality of (six in this embodiment) slits (cuts) 8 at one end of the eyelet 4 at substantially equal intervals on the circumference at the other end. It is formed by forming it. Then, the eyelets 4 are inserted into the through holes 3 from the cut pieces 4b side until the flange-shaped portion 4a is brought into close contact with the component mounting surface 2a and is positioned in contact with the component mounting surface 2a. 4b in the direction along the circumference, with an inclination angle of about 20
Each of the cut pieces 4b is caulked so as to be inclined in the same direction and attached to the printed circuit board 2. Accordingly, each of the cut pieces 4b of the eyelets 4 attached to the printed board 2 in this manner has one end in the direction along the circumference abutting on the printed board 2 and moving away from the printed board 2 toward the other end, A gap of a maximum of t (see FIG. 1) is formed at the other end. 1 and 2
Indicates this state.

Next, in order to mount electronic components using such a fixing device, first, the component mounting surface 2 of the printed circuit board 1 is mounted.
The lead terminal 6 of the electronic component 10 is inserted into the eyelet 4 from the side a, and the back surface 2b is immersed in a solder bath or the like in this state.
Then, as shown in FIG. 3 and FIG.
The wiring copper foil 1 and the lead terminal 6 are mechanically and electrically connected via the.

In this case, each notch 4b is provided at an angle, and a maximum of t
Is formed, the solder 5 penetrates from this gap, and the soldering between each cut piece 4b and the printed board 2 is reliably performed. In addition, since the cut pieces 4b are provided to be inclined in the same direction, it is possible to apply the caulking force on the caulking fixed side to the back surface 2b of the printed circuit board 1 on average, and to make the printed board 2 and the cut piece 4b is also performed on average, the solderability is improved, and the reliability is improved. Further, the notch 4b of the eyelet 4 is provided only at one end, and the other end is provided with a flange-like portion 4 extending substantially at a right angle from the trunk of the eyelet 4.
Since the flange 4a is formed in close contact with the component mounting surface 2a of the printed circuit board 2, stable caulking becomes possible.

In addition, in this structure, since each cut piece 4b is inclined in the direction along the circumference, the inclination angle does not need to be too large, and the distance between the tip of each cut piece 4b and the printed circuit board 2 can be reduced. The maximum dimension h (see FIG. 4) can also be reduced. Therefore, for example, even when the lead terminal 6 of the electronic component 10 is inserted into the eyelet 4 and then clinched (bent), the bend can be sufficiently performed because the distance h is small as shown in FIG. Soldering will be ensured.

[0017]

As described above, according to the apparatus for fixing a printed circuit board electronic component according to the present invention, since the cut pieces are provided inclined, the gap between the cut piece and the printed board surface increases toward the upper side of the inclined portion. A gap is formed in the gap, the solder flows well into the gap, and the printed wiring and the eyelets are sufficiently soldered. Thus, cracks and the like due to a temperature change are eliminated, and a highly reliable fixing can be obtained. In the case where the plurality of cut pieces are provided to be inclined in the same direction, it is possible to apply the caulking force on the caulking fixed side to the printed board surface averagely, and to reduce the force between the printed board surface and the cut piece. Since the soldering between them is also performed on average, the solderability is improved and the reliability is further improved. Further, the cut of the eyelet is provided only at one end, and a flange extending substantially perpendicularly to the trunk of the eyelet is formed at the other end. In the case of mounting by mounting, stable caulking becomes possible and reliability is further improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a fixing device for a printed circuit board electronic component according to an embodiment of the present invention before a lead terminal is attached.

FIG. 2 is a plan view showing a main part of the apparatus of the embodiment from the back side before a lead terminal is attached.

FIG. 3 is a cross-sectional view illustrating a main part of the device of the present embodiment with lead terminals attached.

FIG. 4 is a cross-sectional view showing a main part of the apparatus of the present embodiment with clinch type lead terminals attached thereto.

FIG. 5 is a sectional view showing a first example of a conventional device.

FIG. 6 is a perspective view showing a first example of a conventional device in a state before lead terminals are attached.

FIG. 7 is a sectional view showing a second example of the conventional device.

FIG. 8 is a perspective view showing a second example of the conventional device in a state before lead terminals are attached.

FIG. 9 is a cross-sectional view for explaining a state where a lead terminal inserted as a second example of a conventional device is inserted into an eyelet and clinched.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copper foil for wiring (printed wiring) 2 Printed circuit board 2a Component mounting surface 2b Back surface 3 Through hole 4 Eyelet 4a Flange-shaped part 4b Cut piece 5 Solder 6 Lead terminal 8 Slit (cut) 10 Electronic component

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-37087 (JP, A) JP-A-3-153093 (JP, A) JP-A-51-122768 (JP, A) 83968 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 1/11 H05K 1/18

Claims (5)

(57) [Claims] An eyelet provided with a plurality of cuts at an end thereof is inserted into a through hole formed in a printed circuit board on which printed wiring is formed, and cut pieces divided into a plurality of pieces by the cut are respectively inserted into the printed circuit board. In a fixing device of a printed circuit board electronic component for soldering the printed wiring and the lead terminal of the electronic component inserted in the eyelet through the eyelet, the cut pieces are arranged in a direction along the circumference. One end is the pre
Contact the printed circuit board and print toward the other end.
A fixing device for an electronic component for a printed circuit board, which is provided so as to be inclined away from the printed circuit board. 2. The fixing device for a printed circuit board electronic component according to claim 1, wherein the plurality of cut pieces are provided to be inclined in the same direction. 3. The cutout of the eyelet is provided only at one end, and the other end is formed with a flange extending substantially perpendicularly from the trunk of the eyelet. 3. The printed circuit board according to claim 1, wherein the printed circuit board is attached to the printed circuit board.
The fixing device for an electronic component for a printed circuit board according to claim 1. 4. An eyelet provided with a plurality of cuts at an end thereof is inserted into a through hole formed in a printed circuit board on which printed wiring is formed, and cut pieces divided into a plurality of pieces by the cuts are respectively provided on the back surface of the printed board. A fixing device for an electronic component for a printed circuit board, in which a lead terminal of an electronic component is inserted into the eyelet and bent at the back side, and the lead terminal and the printed wiring are soldered through the eyelet. In each of the cut pieces , one end in a direction along a circumference is
Contact the printed circuit board and print toward the other end.
A fixing device for an electronic component for a printed circuit board, which is provided so as to be inclined away from the printed circuit board. 5. The printed circuit board electronic component fixing device according to claim 4, wherein the plurality of cut pieces are provided to be inclined in the same direction.