JPH0582192A - Fastener for substrate and substrate device - Google Patents

Abstract

(57) [Summary] [Purpose] In a fastener for a substrate, which is inserted into a through hole of a substrate or a substrate and a body with a substrate and adhered to the substrate or the substrate to be secured by axially pressing,
(EN) A substrate fastener in which warpage of a substrate in a fixed state is prevented and damage around a through hole is prevented, and a substrate device using the same. A substrate fastener includes a first cylindrical portion 101a that can be inserted into a through hole of a printed substrate 901 or a substrate and a bus bar 1102, and a second cylindrical portion 101b that extends from one end of the first cylindrical portion. A flange portion 8 that extends from the other end of the first cylindrical portion and is prevented from being inserted into the through hole
04, and the thickness 101c of the first cylindrical portion is set thicker than the thickness 101d of the second cylindrical portion, and the length of the first cylindrical portion is approximately equal to the thickness of the substrate or the thickness of the adherend. Set to equal length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate fastener and a substrate device which are fixed to a substrate or a substrate to be bonded with a substrate assembly.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view of a conventional substrate fastener disclosed in, for example, Japanese Patent Application Laid-Open No. 2-159787.

In the drawing, 801 is a cylindrical portion having an outer diameter 802 and an inner diameter 803.

Reference numeral 804 is a flange body, for example, a flange portion, which extends axially from one end of the cylindrical portion 801.
The outer diameter 805 of this flange portion is larger than the outer diameter 802 of the cylindrical portion 801, and the inner diameter 803 is the same as that of the cylindrical portion 801.
have.

Reference numeral 806 is a nut portion extending axially from the other end of the cylindrical portion 801. In addition, this nut portion 8
Reference numeral 06 denotes a cylindrical body having an outer diameter 802 identical to that of the cylindrical portion 801, and a concentric female screw 807 provided therein. The female screw 807 has a diameter smaller than the inner diameter 803 of the cylindrical portion 801.

The cylindrical portion 801, the flange portion 804,
Further, the fastener 800 for the substrate is configured by the nut portion 806.

Next, a procedure for fixing the board fastener 800 shown in FIG. 8 and the board, for example, the printed board 901 to each other by caulking will be described.

First, as shown in FIG. 9, a fastener 8 for a substrate is used.
00 is a through hole 90 provided on the printed circuit board 901.
1a, and the flange portion 804 is pushed in to a position where it comes into contact with the printed board 901.

The diameter of the through hole 901a is the same as that of the cylindrical portion 80.
1 and the outer diameter 802 of the nut portion 806 is slightly larger than the outer diameter 805 of the flange portion 804.

Now, in the state shown in FIG. 9, when a tool (not shown) is used to axially compress, the portion 801b of the cylindrical portion 801 protruding from the through hole 901a of the printed circuit board 901 is exposed. The diameter 802 is deformed so as to be enlarged.

Then, as shown in FIG. 10, the printed circuit board 901 is sandwiched between the deformed portion 1001 and the flange portion 804, and the printed circuit board 901 and the caulking fixed body 10 are sandwiched.
00 and 100 are fixed to each other.

The substrate fastener 800 crimped on the printed circuit board 901 is referred to as a crimp fixing body 1000.

At this time, if the through hole 901a is a through hole, the through hole and the caulking fixed body 1000 are electrically connected. Then, the circuit parts (not shown) and the like screwed to the screw portion 806 are electrically connected to the through holes.

FIG. 11 is an explanatory diagram of another application example of the substrate fastener 800 shown in FIG.

According to this application example, the board assembly, for example, the through hole 1102a of the bus bar 1102 and the through hole 901s of the printed board 901 are overlapped with each other, and after the board fastener 800 is penetrated, they are crimped to each other. ..

The board fastener 800 in which the adhered body in which the bus bar 1102 and the printed board 901 are superposed is caulked is referred to as a caulked adherent 1100.

Further, the screw 11 screwed into the nut portion 806.
By 03, the bus bar 1104 and the terminal 1105a of the circuit component 1105 are overlapped and fixed to the caulking fixed body 1100.

That is, in this case, the bus bar 110
A large current path connecting the busbar 1104 and the busbar 2 is formed,
The terminal 1105a of the circuit component 1105 is the bus bar 1104.
They are fixed to each other and electrically connected to each other.

The printed circuit board 901 is fixed to the caulked fixing body 1100 and the bus bar 1102, and the through hole 901s of the printed circuit board 901 is electrically connected to the caulking fixed body 1100 and the bus bar 1102.

The length of the cylindrical portion 801 of the board fastener 800 used in FIG. 11 is the printed board 901.
The total length of the thickness of the bus bar 1102, the thickness of the bus bar 1102, and the length for the deformed portion 1101 due to caulking is required.

FIG. 12 shows another conventional fastener 12 for a substrate.
It is sectional drawing of 00. This substrate fastener 1200 is
In the conventional fastener 800 for a substrate shown in FIG. 8, the nut portion 806 and the cylindrical portion 1 without the female screw 807 are provided.
It was changed to 201.

That is, the outer diameter of the cylindrical portion 1201 is equal to the outer diameter 802 of the cylindrical portion 801 of the substrate fastener 800,
The inner diameter 1202 is smaller than the inner diameter 803 of the cylindrical portion 801.

FIG. 13 is an explanatory diagram of an application example of the fastener 1200 for a substrate. According to this application example, the board fastener 1200 is passed through the through hole 901s provided in the printed board 901 and is caulked to be fixed to the printed board 901.

The substrate fastener 1200 fixed to the printed circuit board 901 by crimping is fixed to the printed circuit board 901 by crimping.
Called 0.

Further, after the screw 1304 is inserted into the through hole 1302a of the bus bar 1302, the screw 1304 is inserted into the caulking fixed body 1300 from the side of the cylindrical body portion 1201 to form the flange portion 1203.
The screw portion 1304a of the screw 1304 is projected from the side.

Then, the screw portion 1304a is screwed into a screw hole provided in the terminal 1303a of the circuit component 1303, and the screw 1304 is fastened to the bus bar 130.
2 and the terminal 1303a are fixed to the caulked fixing body 1300.

Then, the through holes 901s of the printed board 901 are electrically connected to the caulked fixing body 1300, and the bus bar 1302, the terminal 1303a of the circuit component 1303, and the caulking fixed body 1300 are electrically connected.

[0028]

According to the above-described conventional board fastener and board device, for example, the board fastener 800 shown in FIG. 8 is caulked and caulked on the printed board 901 as shown in FIG. When deformed to the shape of the fixed body 1000, the deformed portion 1001 presses the edge portion 901c of the through hole 901a of the printed circuit board 901, and the edge portion 901c is easily damaged. There was a problem that the adhesive strength was likely to deteriorate.

The edge portion 901c is damaged by the through hole 9
It may appear as delamination (delamination) or measling (whitening phenomenon) around 01a. In particular, when the through hole 901a is a through hole, the conductor pattern of the through hole is cut due to the damage of the edge portion 901c, or the electrical deformation between the through hole and the caulking fixed body 1000 is caused by the temporal deformation of the edge portion 901c. There is a problem that the contact resistance changes.

Further, the deformed portion 1001 of the caulking fixed body 1000 presses the through hole 901a so as to increase the diameter of the through hole 901a unevenly in the depth direction, which causes a problem that the printed circuit board 901 is warped.

The caulked fixed body 1 shown in FIGS. 11 and 13.
The printed circuit board devices using 100 and 1300 have the same problem.

The present invention has been made in order to solve such a problem, and it is warped of the substrate due to caulking, the edge part of the through hole is damaged, and the edge part of the through hole is deformed with time. An object of the present invention is to obtain a substrate fastener and a substrate device in which deterioration of adhesion is prevented.

[0033]

A fastener for a substrate according to the present invention comprises a first hollow columnar body, a flange body extending axially from one end of the first hollow columnar body, and the first hollow columnar body. A second hollow columnar body having a thickness smaller than that of the wall, one end of which is connected to the other end of the first hollow columnar body, extends in the axial direction, and is compressed by being pressed in the axial direction to expand the outer circumference. And, are provided.

Further, a nut portion having a screw hole extends at the other end of the second hollow columnar body.

Further, in the substrate device using the substrate fastener, the substrate fastener is a first hollow columnar body having a length substantially equal to the thickness of the substrate or the adherend to which the substrate-provided body is superposed on the substrate. After being inserted into the through hole of the substrate or the adherend, the outer circumference of the second hollow columnar body is expanded by being pressed in the axial direction so as to be fixed to the substrate or the adherend. is there.

[0036]

When the substrate fastener configured as described above is pressed in the axial direction, the outer periphery of the second hollow columnar body is expanded and deformed while the outer periphery of the first hollow columnar body remains substantially constant.

Further, in the substrate device constructed as described above, the axial length of the first hollow columnar body is approximately equal to the thickness of the substrate or the thickness of the adherend in which the substrate-attached body is superposed on the substrate. When the substrate fastener is inserted into the through hole of the substrate or the adherend and is pressed in the axial direction, the outer circumference of the second hollow columnar body is expanded and fixed to the substrate or the adherend.

[0038]

【Example】

Example 1. FIG. 1 is a sectional view of a fastener 100 for a substrate showing an embodiment of the present invention.

In FIG. 1, reference numerals 802 to 807 are the same as those in the conventional fastener 800 for a substrate shown in FIG.

Reference numeral 101 is a tubular body portion in which a flange portion 804 extends from one end in the axial direction and a nut portion 806 extends from the other end in the axial direction.

This tubular body portion 101 includes a first hollow columnar body on the side of the flange portion 804, for example, the first cylindrical portion 101a, and a second hollow columnar body on the side of the nut portion 806, for example, the second cylindrical portion 1.
01b, and.

The wall thickness 101 of the first cylindrical portion 101a
c is configured to be thicker than the wall thickness 101d of the second cylindrical portion 101b.

Next, the deforming operation of the board fastener 100 when the board fastener 100 and the printed board 901 are fixed to each other by crimping will be described.

Prior to caulking, first, the fastener 1 for the substrate
00 is a through hole 901a provided in the printed circuit board 901.
To insert. Then, as shown in FIG. 2, the flange portion 80
The fourth surface 804a on the first cylindrical portion 101a side is pushed until it contacts one surface of the printed circuit board 901.

A through hole 901 of the printed circuit board 901 is provided.
The diameter of a is slightly larger than the outer diameter 102 of the first cylindrical portion 101a and smaller than the outer diameter 805 of the flange portion 804,
The axial length 808 of the first cylindrical portion 101a is set to be approximately equal to the thickness 910 of the printed circuit board 901 or slightly shorter than this.

In the state shown in FIG. 2, the nut portion 806 is pressed toward the flange portion 804 by a caulking tool (not shown). Then, due to this pressurization, the second cylindrical portion 101b
The outer and inner diameters of the are deformed so that they are expanded.

Then, as shown in FIG. 3, the second cylindrical portion 10
The printed board 901 is pressed and fixed between the deformed portion 301 of 1b and the flange portion 804.

A printed circuit board 90 as shown in FIG.
The substrate fastener 100 in the crimped state 1 is referred to as a crimped fixing body 300.

In this caulking operation, the first cylindrical portion 101
a is hardly deformed, and as shown in FIG. 3, the edge portion 90 of the through hole 901 a of the printed circuit board 901.
1c is not pressed by the deforming portion 301.

Further, a non-uniform force in the depth direction which acts to widen the diameter of the through hole 901a does not apply to the printed circuit board 901 and does not warp the printed circuit board 901.

Example 2. Further, similarly to the cylindrical portion 1201 of FIG. 12 showing the conventional example, in FIG.
May have a cylindrical shape without the female screw 807.

Example 3. In addition, the above-mentioned female screw 8
The inner diameter of the cylindrical portion without 07 is as shown by the portion 406 in FIG.
Even if the inner diameter 803 of the cylindrical portion 101b is the same as that of the first embodiment.
Alternatively, the same effect as the second embodiment can be obtained.

In the case of the shape shown in FIG. 4,
To prevent the inner diameter 803 and outer diameter 802 of portion 406 from expanding during crimping, an adapter (not shown) having a cylindrical recess that fits into portion 406 is attached to portion 40.
It is necessary to pressurize in the state that it is fitted in 6.

Example 4. Further, in the third embodiment, pressure is applied without using an adapter (not shown) having a cylindrical recess that fits into the cylindrical portion 406, and the caulking and the portion 406 are performed.
The inner diameter 803 and the outer diameter 802 may be expanded.

Example 5. In addition, in the first to fourth embodiments, the length of the first cylindrical portion 101a is the printed circuit board 90.
5 shows a case in which the length is approximately equal to the thickness of 1 or is set to be slightly shorter than this length and the caulking is performed on the printed circuit board 901. However, the present invention is not limited to this and is shown in FIG. As described above, the board-attached body, for example, the bus bar 1102 may be sandwiched between the printed board 901 and the flange portion 804, and in this state, the bus bar 1102 and the printed board 901 may be overlapped and caulked. In this case, bus bar 1
A stack of the printed circuit board 901 and the printed circuit board 901 is referred to as an adherend.

The axial length of the first cylindrical portion 101a in this case is approximately equal to the thickness of the bus bar 1102 plus the thickness of the substrate, or a length slightly shorter than this length. Is set to

Example 6. FIG. 6 is a sectional view of a substrate fastener 600 showing still another embodiment of the present invention.

FIG. 6 is the same as FIG. 1 except that the rounding is performed so that the wall thickness gradually changes at the joint between the first cylindrical portion 101a and the second cylindrical portion 101b.

FIG. 7 is a partial cross-sectional view of the board device in the state where the board fastener 600 is fixed to the printed board 901 by crimping.

It is to be noted that the board fastener 600 in a state where the printed board 901 is crimped is fixed to the fixed body 70 by crimping.
Called 0.

The substrate fastener 600 has an effect of preventing cracks and buckling of the substrate fastener 600 itself when the substrate or the adherend is caulked.

In the sixth embodiment, R processing is applied to the joint between the first cylindrical portion 101a and the second cylindrical portion 101b in the first embodiment, but the present invention is not limited to this, and the second to fifth embodiments are provided.
Can be applied to any of the above, and has the same effect.

Example 7. In addition, in the first to sixth embodiments, the first cylindrical portion 101a and the second cylindrical portion 101b.
Although the inner diameters are the same, the present invention is not limited to this, and the same effect can be obtained even if the outer diameters are made the same and the inner diameters are made different from each other.

Example 8. Further, in the first to seventh embodiments, the first cylindrical portion 101a and the second cylindrical portion 101b are cylindrical bodies, but the present invention is not limited to this, and may be rectangular cylindrical bodies.

[0065]

The present invention is configured as described above, and when the substrate fastener is axially pressed, the outer circumference of the first hollow columnar body is substantially constant, and the second hollow columnar body is substantially constant. Since the outer circumference of the substrate expands, the axial length of the first hollow columnar body is set to be approximately equal to the thickness of the substrate or the thickness of the adherend to which the substrate-attached body is superposed on the substrate. Or after inserting into the through hole of the adherend,
When pressed and crimped in the axial direction, deterioration of the caulking fixing force due to warpage of the substrate, damage to the edge part of the through hole and temporal deformation of the edge part of the through hole is prevented, and the reliability of the device using this can be improved. effective.

[Brief description of drawings]

FIG. 1 is a sectional view of a substrate fastener according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which the board fastener shown in FIG. 1 is inserted into a through hole of a printed board.

FIG. 3 is a partial cross-sectional view of the board device in a state where the board fastener is caulked and fixed to the printed board from the state shown in FIG.

FIG. 4 is a cross-sectional view showing an example in which the nut portion of the substrate fastener shown in FIG. 1 is a cylindrical body having the same inner diameter and outer diameter as the second cylindrical portion.

FIG. 5 is a partial cross-sectional view of the substrate device showing a state in which the substrate fastener shown in FIG. 1 is inserted into the through holes of the printed circuit board and the through holes of the bus bar and caulked.

FIG. 6 is a sectional view of a fastener for a substrate according to a sixth embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of the board device in a state where the board fastener shown in FIG. 6 is caulked and fixed to a printed board.

FIG. 8 is a cross-sectional view of a conventional substrate fastener.

9 is an explanatory view showing a state in which the board fastener shown in FIG. 8 is inserted into a printed board.

FIG. 10 is a partial cross-sectional view of the conventional board device in a state where the board fastener is caulked and fixed to the printed board from the state shown in FIG. 9;

11 is an explanatory diagram showing an application example of the fastener for a substrate shown in FIG.

FIG. 12 is a cross-sectional view of another conventional fastener for a substrate.

FIG. 13 is an explanatory diagram showing an application example of the substrate fastener shown in FIG.

[Explanation of symbols]

 100 Board Fastener 101a First Cylindrical Section 101b Second Cylindrical Section 600 Board Fastener 804 Flange Section 806 Nut Section 901 Printed Circuit Board 1102 Busbar

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Nakajima 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation

Claims (3)

[Claims] 1. A first hollow columnar body, a flange body extending axially from one end of the first hollow columnar body, and a wall thickness smaller than that of the first hollow columnar body, wherein one end is A fastener for a substrate, comprising: a second hollow columnar body which is connected to the other end of the first hollow columnar body, extends in the axial direction, is compressed by being pressed in the axial direction, and has an expanded outer periphery. 2. The fastener for a substrate according to claim 1, wherein a nut portion having a screw hole extends at the other end of the second hollow columnar body. 3. A substrate device using the substrate fastener according to claim 1 or 2, wherein the substrate fastener has a thickness substantially equal to that of a substrate or a body to be adhered in which a substrate assembly is superposed on the substrate. 〞Has first hollow pillars of equal length,
After being inserted into the through hole of the substrate or the adherend,
A substrate device, wherein the outer periphery of the second hollow columnar body is expanded by being pressed in the axial direction and is fixed to the substrate or the adherend.