JP4532462B2 - Press-fit terminal - Google Patents

Description

  The present invention relates to, for example, a press-fit terminal that is press-fitted and held in a through-hole formed in a substrate or the like of various electronic devices, and more particularly, to a press-fit terminal that can suppress damage to the terminal or the substrate.

  In recent years, press-fit terminals have been used as connectors used in various electronic devices from the viewpoints of solder-free, mounting work efficiency, cost reduction, and the like.

  A press-fit terminal is press-fitted and electrically connected to a through hole formed in a substrate or the like of various electronic devices, and has been conventionally proposed in various shapes.

  For example, Patent Document 1 discloses a press-fit portion that is an elongated plate-like body, and has a narrow introduction portion at the tip and a slit that extends from the introduction portion and extends in the longitudinal direction at the center portion. In the press-fit contact used by being press-fitted into the through hole, the press-fit portion is linearly expanded from the introduction portion to be wide, and the slit is about halfway from the introduction portion. There has been proposed a press-fit contact having a reduced opening whose width is reduced toward the end and an arc-shaped extended opening continuously extended at the tip. According to this press-fit contact, when the press-fit portion is press-fitted into the through-hole, the press-fit portion is forcedly displaced in the through-hole and is held and connected (hereinafter, this technique is referred to as Conventional Example 1).

Further, Patent Document 2 is a press-fit terminal in which a main body portion, a pressure holding portion, and an introduction portion are integrally formed and press-fitted and held in a through hole provided in a wiring board, and the pressure holding portion is A press-fit terminal has been proposed that has a predetermined press-fit diameter for the through-hole, has an elastic force that becomes a holding force when it is press-fitted into the through-hole, and the introduction portion has an elastic force that is weaker than the elastic force of the pressure holding portion. ing. According to this press-fit terminal, it is press-fitted and held in the through hole of the wiring board of the electronic control unit used in the high temperature environment in the automobile, and when it is press-fitted into the through hole, damage to the wiring board due to the press-fitting is suppressed (Hereinafter, this technique is referred to as Conventional Example 2).
JP 2005-71732 A JP 2004-127610 A

  In Conventional Example 1, the lower end of the opening is formed in an arc shape. However, when a through hole is press-fitted, stress tends to concentrate on the constricted portion at the base end of the arc, so that the terminal is damaged (cracked). There is a problem that damage (delamination) of the substrate may occur.

  In addition, in order to disperse the stress at the time of through-hole press-fitting, to prevent terminal cracks and to reduce substrate damage, it is necessary to reduce the inclination angle of the outer periphery of the introduction part. In order to obtain a size corresponding to the diameter of the hole, it is necessary to increase the distance in the longitudinal direction of the opening. However, if the upper and lower portions of the opening are formed symmetrically as in Conventional Example 1, there is a problem that the size of the terminal becomes large and it becomes impossible to cope with downsizing of the substrate.

  Furthermore, the amount of burrs generated in the through holes when the through holes are press-fitted is proportional to the contact area of the terminals in contact with the inner walls of the through holes. However, if the contact area is large as in Conventional Example 1, many burrs are generated. There was a problem to do.

  In Conventional Example 2, the upper end and the lower end of the opening are formed in a triangular shape. However, when the through hole is press-fitted, stress is easily concentrated at the bent portion of the base end of the triangle. There is a problem that damage (delamination) of the substrate may occur.

  The present invention has been made to solve the above-described problems, and provides a press-fit terminal that can suppress damage to the terminal and the substrate and the generation of burrs during press-fitting of a through hole, and can cope with downsizing of the substrate. The purpose is to do.

The press-fit terminal of the present invention is formed at the tip and is introduced into the through hole, connected to the introduction portion, press-fitted and held in the through-hole, and the pressure holding portion. In a press-fit terminal having a connected main body part and having an opening extending in the longitudinal direction from the center of the pressure holding part to the main body part side and the introduction part side,
The introduction part is formed to be narrower than the inner diameter of the through hole,
Length in the longitudinal direction from the center of the pressure holding portion to the opening one end of the body portion side is shorter than the longitudinal length from the center of the pressure holding portion to the opening the other end of the inlet side Formed,
The one end and the other end of the opening are formed to be curved outward in a substantially U shape in plan view,
The opening is formed so as to be inclined inwardly from the center of the pressure holding part toward the one end, and is inclined inward from the center of the pressure holding part toward the other end. Formed,
A portion substantially parallel to the central axis of the opening is provided on one end side of the other end of the opening.
It is characterized by this.

  The outer periphery of the introduction portion may be formed to be inclined inward toward the tip at an angle within a range of 5 ° to 12 ° with respect to the central axis of the opening.

  The length of the pressure holding portion in the longitudinal direction may be in the range of 0.05 to 0.5 mm.

  According to the first aspect of the present invention, the length in the longitudinal direction from the center of the pressure holding part to the one end of the opening on the main body part side, and the longitudinal direction from the center of the pressure holding part to the other end of the opening on the introduction part side The ratio with the length of the wire is in the range of 80: 220 to 120: 180. Therefore, the terminal size can be reduced to cope with the downsizing of the substrate and the like, and the stress in the opening can be reliably ensured when the through hole is press-fitted. It is possible to disperse, and damage to terminals (cracks) and damage to substrates (delamination) can be suppressed.

  In addition, since one end and the other end of the opening are formed to be curved outward in a substantially U shape in plan view, there are no constricted portions or bent portions in the opening as in the conventional example, and when the through hole is press-fitted It is possible to prevent concentration of the generated stress.

  According to the second aspect of the invention, since the load applied to the substrate is dispersed during the press-fitting of the through hole, damage to the substrate can be suppressed.

  According to the invention which concerns on Claim 3, since the contact area of the outer peripheral surface of a pressure holding part and the inner wall face of a through hole becomes small, generation | occurrence | production of the burr | flash of terminal plating can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A is a plan view showing a press-fit terminal according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line bb of FIG. 1A, and FIG. 1C is a press according to an embodiment of the present invention. It is explanatory drawing which shows the state which press-fits the fit terminal to the through hole.

  A press-fit terminal T according to an embodiment of the present invention is made of a plate-like body manufactured by punching a conductive metal plate such as copper or copper alloy (for example, phosphor bronze), and is shown in FIGS. As shown in FIG. 2, an introduction part 2 formed at the tip and introduced into the through hole 1 of the substrate 6, a pressure holding part 3 connected to the introduction part 2 and press-fitted and held in the through hole 1, and a pressure holding And a main body part 4 connected to the part 3.

  An opening 5 extending in the longitudinal direction is formed from the center of the pressure holding portion 3 to the main body 4 side and the introduction portion 2 side.

  The introduction portion 2 is a portion that guides the pressure holding portion 3 into the through hole 1 of the substrate 6, and has a width narrower than the inner diameter of the through hole 1.

  The outer periphery of the introduction portion 2 is inclined inward toward the tip at an angle θ within a range of 5 ° to 12 ° (13 ° to 15 ° for a conventional press-fit terminal) with respect to the central axis C of the opening 5. It is preferable to be formed. By forming the angle θ more gently than before, the load applied to the substrate 6 is dispersed when the through-hole 1 is press-fitted, so that damage to the substrate 6 can be suppressed.

  The pressure holding portion 3 is a portion that is press-fitted into the through hole 1, is deformed so as to have a narrow width, is held in the through hole 1, and is electrically connected.

  The pressure holding unit 3 is preferably formed to have a length in the longitudinal direction as short as possible within a range in which an appropriate holding force can be ensured according to a use such as a vehicle such as an automobile. As a result, the contact area between the outer peripheral surface of the pressure holding portion 3 and the inner wall surface of the through hole 1 is reduced, so that occurrence of burrs in terminal plating can be suppressed.

  For example, when the diameter of the through hole 1 is 1.1 mm and the length of the entire terminal in the longitudinal direction is 4.0 mm, the length of the pressure holding unit 3 in the width direction is 1.2 mm, and the length L1 in the longitudinal direction is It is preferably formed within a range of 0.05 to 0.5 mm.

  The main body 4 is connected to, for example, a connector (not shown) used in various electronic devices, and a large number of the press-fit terminals T described above are arranged at intervals in the connector.

  The length L2 in the longitudinal direction of the opening upper part 5b from the center of the pressure holding part 3 to the opening upper end 5a on the main body part 4 side, and the opening from the center of the pressure holding part 3 to the opening lower end 5c on the introduction part 2 side The ratio of the lower part 5d to the length L3 in the longitudinal direction is in the range of 80: 220 to 120: 180.

  Usually, the length of the press-fit terminal T held by pressure is limited by the size of the through hole 1 of the substrate 6. For this reason, in the eye needle type, if the length of the opening upper part 5b is not regulated in parallel with the inclination of the contact of the opening lower part 5d, the opening upper part 5b may be cracked. According to the experiment by the present inventor, when the ratio of the length in the longitudinal direction of the opening upper portion 5b and the opening lower portion 5d is the above ratio, the crack in the opening upper portion 5b did not occur. When this value was exceeded with products of other companies, cracks in the upper portion 5b of the opening occurred.

  Further, since the length in the longitudinal direction of the upper portion 5b of the opening is shorter than that of the lower portion 5d of the opening, the size of the press-fit terminal T can be reduced and the size of the substrate 6 and the like can be reduced.

  The upper end 5a and the lower end 5c of the opening are formed to be curved outward in a substantially U shape in plan view. As a result, there are no constricted portions or bent portions as in the conventional example, and it is possible to prevent stress concentration that occurs when the through-hole 1 is press-fitted.

  The upper portion 5b of the opening is formed so as to be inclined inwardly toward the substantially U-shaped upper end 5a. The opening lower portion 5d is formed so as to be inclined inwardly toward the substantially U-shaped lower end 5c, but on the upper side of the opening lower end 5c, the central axis C of the opening 5 is formed. A substantially parallel portion 5e is provided. This is because if a U-shaped portion is formed so as to be immediately deformed into an inverted C shape, a phenomenon similar to an arc shape (a phenomenon in which stress concentration occurs in the constricted portion) occurs. This is because the stress is dispersed by providing the substantially parallel portion 5e with respect to. The length in the longitudinal direction of the parallel part 5e is preferably about 20 μm or more.

  According to the press-fit terminal T according to the embodiment of the present invention, the length L2 in the longitudinal direction of the opening upper part 5b from the center of the pressure holding part 3 to the opening upper end 5a on the main body part 4 side, and the pressure holding part 3 is within the range of 80: 220 to 120: 180 in the longitudinal direction L3 of the opening lower portion 5d from the center of the opening 3 to the opening lower end 5c on the introduction portion 2 side. Thus, it is possible to cope with the downsizing of the substrate 6 and to reliably disperse the stress into the opening 5 when the through hole is press-fitted, thereby suppressing the damage (crack) of the terminal T and the damage (delamination) of the substrate 6. it can.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical matters described in the claims.

  The press-fit terminal T of the present invention is press-fitted and held in a through hole 1 formed on a substrate or the like of various electronic devices and used for electrical connection.

(A) is a plan view showing a press-fit terminal according to an embodiment of the present invention, (B) is a cross-sectional view taken along line bb of (A), and (C) is a press-fit terminal according to an embodiment of the present invention. It is explanatory drawing which shows the state which press-fitted and hold | maintained to the through hole.

Explanation of symbols

T: Press-fit terminal 1: Through hole 2: Introduction part 3: Pressure holding part 4: Body part 5: Opening part 6: Substrate

Claims (3)

An introduction part formed at the tip and introduced into the through hole; a pressure holding part connected to the introduction part and press-fitted and held in the through hole; and a main body part connected to the pressure holding part. In the press-fit terminal in which an opening extending in the longitudinal direction from the center of the pressure holding part to the main body part side and the introduction part side is formed,
The introduction part is formed to be narrower than the inner diameter of the through hole,
Length in the longitudinal direction from the center of the pressure holding portion to the opening one end of the body portion side is shorter than the longitudinal length from the center of the pressure holding portion to the opening the other end of the inlet side Formed,
The one end and the other end of the opening are formed to be curved outward in a substantially U shape in plan view,
The opening is formed so as to be inclined inwardly from the center of the pressure holding part toward the one end, and is inclined inward from the center of the pressure holding part toward the other end. Formed,
A portion substantially parallel to the central axis of the opening is provided on one end side of the other end of the opening.
A press-fit terminal characterized by that.   The outer periphery of the introduction portion is formed to be inclined inward toward the tip at an angle within a range of 5 ° to 12 ° with respect to the central axis of the opening. Press-fit terminal as described.   The press-fit terminal according to claim 1 or 2, wherein a length of the pressure holding portion in a longitudinal direction is in a range of 0.05 to 0.5 mm.

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