JP2017174642A - Press-fit terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press-fit terminal capable of efficiently removing a formed film formed on the inner peripheral surface of a through hole and suppressing the influence on a substrate.SOLUTION: In a press-fit terminal 1 including: an insertion portion 9 which is provided in a substrate 3 and is inserted into a through hole 7 in which a generation film 5 is formed on the inner peripheral surface; and a bulging portion 11 provided in the insertion portion 9 and brought into close contact with the inner peripheral surface of the through hole 7, a communication hole 13 communicating the inside and the outside of the insertion portion 9 and a housing part 15, provided inside the insertion portion 9, housing the generated film 5 which has passed through the communication hole 13 are provided in the insertion portion 9.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a press-fit terminal. Specifically, the present invention relates to a press-fit terminal that is inserted in close contact with an inner peripheral surface of a through hole of a substrate.

  Conventionally, as a press-fit terminal, a press-fit pin as an insertion portion that is inserted into a through-hole provided in a substrate, and a bulge portion that is provided in this press-fit pin and is in close contact with the inner peripheral surface of the through-hole A device including a key is known (for example, see Patent Document 1).

  By the way, in recent years, for example, a water-soluble preflux (OSP) is used on a substrate to which a press-fit terminal is connected in order to prevent oxidation of plating made of copper or the like, which is a conductor portion located in a through hole, and to improve solderability. As a result of the surface treatment, a generated film such as an OSP film is formed on the surface.

  When the press-fit pin of the press-fit terminal is inserted into the through-hole, the key provided on the press-fit pin slides in close contact with the inner peripheral surface of the through-hole on the substrate on which such a generated film is formed. Thus, the generated film formed on the inner peripheral surface of the through hole is removed, and the newly formed surface on the inner peripheral surface of the through hole and the key of the press-fit pin can be brought into contact with each other to perform adhesion between metals.

JP 2007-250549 A

  However, in the press-fit terminal as in Patent Document 1, a certain amount of the generated film can be removed by sliding between the bulging portion and the inner peripheral surface of the through hole. There is a possibility that a generated film that is deposited on the front side in the insertion direction or cannot be removed is interposed between the bulging portion and the inner peripheral surface of the through hole, thereby increasing the contact resistance.

  On the other hand, it is conceivable to increase the contact load between the bulge and the inner peripheral surface of the through hole to increase the removal rate of the formed film formed on the inner peripheral surface of the through hole. If it is too much, the plating which is the conductive part of the substrate may be peeled off.

  Accordingly, an object of the present invention is to provide a press-fit terminal capable of efficiently removing a generated film formed on the inner peripheral surface of a through hole and suppressing an influence on a substrate.

  According to the first aspect of the present invention, there is provided an insertion portion that is provided on the substrate and is inserted into a through hole in which a generated film is formed on an inner peripheral surface, and an inner peripheral surface of the through hole that is provided in the insertion portion and is in close contact with the through hole A press-fit terminal provided with a bulging portion, wherein the insertion portion has a communication hole communicating with the inside and the outside of the insertion portion, and is provided inside the insertion portion and passes through the communication hole. And an accommodating portion for accommodating the generated film.

  In this press-fit terminal, the insertion portion is provided with a communication hole that communicates the inside and the outside of the insertion portion, and a housing portion that is provided inside the insertion portion and accommodates the generated film that has passed through the communication hole. The generated film removed from the inner peripheral surface of the through hole is not deposited by sliding between the bulging portion and the inner peripheral surface of the through hole.

  For this reason, the generated film formed on the inner peripheral surface of the through hole by sliding between the bulged portion and the inner peripheral surface of the through hole can be efficiently removed, and the inner peripheral surface of the bulged portion and the through hole A sufficient contact area with the new surface can be ensured, and adhesion of the metal between the bulging portion and the through hole can be performed stably.

  In addition, since the generated film formed on the inner peripheral surface of the through hole can be efficiently removed, the contact load between the bulging portion and the inner peripheral surface of the through hole is not excessively increased, and the substrate The influence on the substrate can be suppressed, for example, by removing the plating that is the conductive portion.

  Accordingly, in such a press-fit terminal, by providing the insertion hole with the communication hole and the accommodating portion, the generated film formed on the inner peripheral surface of the through hole is efficiently removed, and the influence on the substrate is suppressed. be able to.

  Invention of Claim 2 is the press fit terminal of Claim 1, Comprising: The said communicating hole is arrange | positioned ahead of the said bulging part with respect to the insertion direction of the said through hole of the said insertion part. It is characterized by.

  In this press-fit terminal, since the communication hole is arranged in front of the bulging portion with respect to the insertion direction of the through hole of the insertion portion, the generated film to be deposited on the front side in the insertion direction of the bulging portion is formed. It can be efficiently guided to the accommodating portion through the communication hole, and the generated film formed on the inner peripheral surface of the through hole can be more efficiently removed.

  According to the present invention, there is an effect that it is possible to provide a press-fit terminal that can efficiently remove the generated film formed on the inner peripheral surface of the through hole and suppress the influence on the substrate.

It is a perspective view of a press fit terminal concerning an embodiment of the invention. It is sectional drawing of the board | substrate with which the press fit terminal which concerns on embodiment of this invention is connected. It is sectional drawing when connecting the press fit terminal which concerns on embodiment of this invention to a board | substrate. It is sectional drawing when the press fit terminal which concerns on embodiment of this invention is connected to the board | substrate. It is a perspective view which shows the other example of the press fit terminal which concerns on embodiment of this invention.

  A press-fit terminal according to an embodiment of the present invention will be described with reference to FIGS.

  The press-fit terminal 1 according to the present embodiment includes an insertion portion 9 that is provided in the substrate 3 and is inserted into a through hole 7 in which a generation film 5 is formed on an inner peripheral surface, and a through hole 7 that is provided in the insertion portion 9. And a bulging portion 11 in close contact with and in contact with the inner peripheral surface.

  The insertion portion 9 is provided with a communication hole 13 that communicates the inside and the outside of the insertion portion 9 and a storage portion 15 that is provided inside the insertion portion 9 and that accommodates the generated film 5 that has passed through the communication hole 13. It has been.

  The communication hole 13 is disposed on the front side of the bulging portion 11 with respect to the insertion direction of the through hole 7 of the insertion portion 9.

  As shown in FIGS. 1 to 4, the substrate 3 has a plurality of electronic components (not shown) and the like, and a conductive portion that constitutes a circuit that electrically connects the electronic components is a conductive material such as copper. It consists of a printed wiring board formed as plating 17.

  In order to improve the solderability for fixing the connection member such as the press-fit terminal 1 connected to the substrate 3, this substrate 3 is not subjected to oxidation prevention of the plating 17 or in the present embodiment. A surface treatment is performed by water-soluble preflux (OSP), and an OSP film as the generation film 5 is formed on the surface.

  In such a substrate 3, a through hole 7 is provided so as to penetrate the substrate 3 in the thickness direction in a portion of the plating 17 that is a conductive portion, and the press-fit terminal 1 is inserted into the through hole 7. The substrate 3 and the press-fit terminal 1 are electrically connected.

  The press-fit terminal 1 is made of a conductive material such as copper, and is provided with an insertion portion 9 that is electrically connected at one end side to a power source or equipment and connected to the substrate 3 at the other end side.

  The insertion portion 9 is provided so as to be able to pass through the through hole 7 of the substrate 3 and is inserted into the through hole 7 from one side of the substrate 3 toward the other side. The insertion portion 9 is provided with a bulging portion 11.

  The bulging portion 11 is set to have an outer diameter slightly larger than the inner diameter of the through hole 7, and slides in close contact with the inner peripheral surface of the through hole 7 when the insertion portion 9 is inserted into the through hole 7. It is press-fitted into the through hole 7.

  By press-fitting the bulging portion 11 into the through hole 7 in this way, the press-fit terminal 1 can be fixed to the substrate 3 without performing soldering, and the inner periphery of the bulging portion 11 and the through hole 7 can be fixed. The surface can be brought into close contact with each other, and the connection reliability between the substrate 3 and the press-fit terminal 1 can be maintained.

  Here, when the bulging portion 11 is press-fitted into the through hole 7, the sliding between the bulging portion 11 and the inner peripheral surface of the through hole 7 causes the surface of the plating 17 located on the inner peripheral surface of the through hole 7 to slide. The formed production film 5 can be removed.

  However, the generated film 5 peeled off from the surface of the plating 17 is deposited on the front side in the insertion direction of the bulging portion 11 or is generated on the rear side in the insertion direction of the bulging portion 11 when the amount of deposition increases. The film 5 remains, and the generated film 5 is interposed between the bulging portion 11 and the inner peripheral surface (plating 17) of the through hole 7 to increase the contact resistance and the holding force of the press-fit terminal 1 against the substrate 3. There was a risk of causing a decline.

  Therefore, the insertion portion 9 is provided with a communication hole 13 that communicates the inside and the outside of the insertion portion 9 and a housing portion 15 that is provided inside the insertion portion 9 and accommodates the generated film 5 that has passed through the communication hole 13. It has been.

  A plurality of communication holes 13 are arranged in front of the bulging portion 11 with respect to the insertion direction of the through hole 7 of the insertion portion 9, and the internal space of the insertion portion 9 formed by providing the bulging portion 11 and the outside are provided. Communicate.

  The accommodating portion 15 is an internal space of the insertion portion 9 formed by providing the bulging portion 11, and is communicated to the outside through a plurality of communication holes 13.

  The communication hole 13 and the accommodating portion 15 are formed on the surface of the plating 17 located on the inner peripheral surface of the through hole 7 by sliding between the bulging portion 11 and the inner peripheral surface of the through hole 7. The generated film 5 is peeled off, and the peeled generated film 5 is accommodated in the accommodating portion 15 through the communication hole 13.

  By accommodating the peeled production film 5 in the communication hole 13 and the accommodation portion 15, the production film 5 peeled off is not deposited on the front side in the insertion direction of the bulging portion 11. The amount does not increase, and the generation film 5 can be prevented from remaining on the rear side in the insertion direction of the bulging portion 11.

  Therefore, the generated film 5 formed on the inner peripheral surface of the through hole 7 can be efficiently removed by sliding between the bulging portion 11 and the inner peripheral surface of the through hole 7. The contact area of the new surface, which is the surface of the plating 17 located on the peripheral surface, can be sufficiently secured, and the metal adhesion between the bulging portion 11 and the plating 17 is stably performed, and the substrate 3 and the press-fit terminal The connection reliability with 1 can be improved.

  In addition, since the generated film 5 formed on the inner peripheral surface of the through hole 7 can be efficiently removed, the contact load between the bulging portion 11 and the inner peripheral surface of the through hole 7 is increased more than necessary. Therefore, the influence on the substrate 3 in the connection of the press-fit terminal 1 can be suppressed, such as peeling off the plating 17 in the through-hole 7 in the press-fitting of the bulging portion 11.

  In addition, since the OSP which is the peeled product film 5 is an insulator, unlike the metal powder or the like, it may be left in the state of being accommodated in the communication hole 13 or the accommodating portion 15, but may be left by air blow or the like. It may be removed.

  Here, as shown in FIG. 5, the insertion part 9 and the bulging part 11 may be provided with a slit 19 along the length direction of the insertion part 9a to form the bulging part 11a in a spherical shape.

  Also in such an insertion part 9a, a plurality of communication holes 13 are provided in front of the bulging part 11a in the insertion direction of the through hole 7 of the insertion part 9a, and the plurality of communication holes 13 communicate with the inside of the insertion part 9a. What is necessary is just to provide the accommodating part 15 to perform.

  In such a press-fit terminal 1, the insertion portion 9 accommodates the communication hole 13 that connects the inside and the outside of the insertion portion 9 and the generated film 5 that is provided inside the insertion portion 9 and passes through the communication hole 13. Since the accommodating portion 15 is provided, the generated film 5 removed from the inner peripheral surface of the through hole 7 due to sliding between the bulging portion 11 and the inner peripheral surface of the through hole 7 is not deposited.

  For this reason, the generated film 5 formed on the inner peripheral surface of the through hole 7 can be efficiently removed by sliding between the bulging portion 11 and the inner peripheral surface of the through hole 7. A sufficient contact area between the inner peripheral surface of the hole 7 and the new surface can be ensured, and adhesion of the metal between the bulging portion 11 and the through hole 7 can be performed stably.

  In addition, since the generated film 5 formed on the inner peripheral surface of the through hole 7 can be efficiently removed, the contact load between the bulging portion 11 and the inner peripheral surface of the through hole 7 may be excessively increased. In addition, it is possible to suppress the influence on the substrate 3 such as peeling off the plating 17 which is the conductive portion of the substrate 3.

  Therefore, in such a press-fit terminal 1, by providing the insertion hole 9 with the communication hole 13 and the accommodating part 15, the generated film 5 formed on the inner peripheral surface of the through hole 7 can be efficiently removed, and the substrate 3 can be suppressed.

  Further, since the communication hole 13 is disposed in front of the bulging portion 11 with respect to the insertion direction of the through hole 7 of the insertion portion 9, the generated film to be deposited on the front side in the insertion direction of the bulging portion 11. 5 can be efficiently guided to the accommodating portion 15 through the communication hole 13, and the generated film 5 formed on the inner peripheral surface of the through hole 7 can be more efficiently removed.

  In the press-fit terminal according to the embodiment of the present invention, a plurality of communication holes are provided. However, the present invention is not limited to this, and the number of communication holes may be one. It is preferable to provide a plurality of communication holes uniformly over the entire contact area.

  Moreover, although the opening of the communication hole is circular, it is not limited to this and may be a square such as a triangle or a rhombus.

DESCRIPTION OF SYMBOLS 1 ... Press fit terminal 3 ... Board | substrate 5 ... Generated film 7 ... Through-hole 9, 9a ... Insertion part 11, 11a ... Expansion part 13 ... Communication hole 15 ... Accommodating part

Claims (2)

An insertion portion provided in the substrate and inserted into a through hole having a generated film formed on an inner peripheral surface thereof, and a bulging portion provided in the insertion portion and in close contact with and contacted with the inner peripheral surface of the through hole. Press-fit terminals,
The insertion portion is provided with a communication hole that communicates the inside and the outside of the insertion portion, and a storage portion that is provided inside the insertion portion and that stores the generated film that has passed through the communication hole. A press-fit terminal characterized by The press-fit terminal according to claim 1,
The press-fit terminal, wherein the communication hole is disposed in front of the bulging portion with respect to the insertion direction of the through hole of the insertion portion.

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