KR101032933B1 - Contact for press fit and press fit connector using the same - Google Patents

Abstract

The present invention does not inhibit proper deformation of the interference fitting portion when pressed into the through hole, and prevents the occurrence of buckling or cracking in the interference fitting portion even when obliquely inserted into the through hole. An object of the present invention is to provide a hole-type interference fit contact and a connector using the same.

In the case of an interference fit contact of the needle hole type, a projection having a thin thickness is provided so as to cover at least a part of the slit in the interference fit portion.

Description

CONTACT FOR PRESS FIT AND PRESS FIT CONNECTOR USING THE SAME}

1 is a plan view of the main part of a conventional interference fit contact;

2A and 2B are perspective views seen from the front end (bottom) side of the interference fit contact of the present invention and from the front top side;

3A to 3D are front plan views, rear plan views, side views, and plan views, respectively, of the interference fit contact of the present invention;

FIG. 4 is an explanatory diagram for explaining the deformation of a contact in the case where the interference fit contact of the present invention is press-fitted into a through hole of a circuit board. FIG. 4A is a side view showing a state where an introduction portion is inserted into a through hole. 4B is a side view showing a state in which the interference fitting portion 12 is pressed into the through hole, and FIG. 4C is a bottom view of the state of FIG. 4B (a plan view seen from the back side of the through hole of the circuit board).

5A and 5B are schematic side and schematic bottom views of a connector of the present invention.

<Description of the symbols for the main parts of the drawings>

10: Force fit contact (contact)

11: Introduction

12: interference fit                 

13, 14: branch

15: slit

16: first protrusion

17: second protrusion

18: derivation unit

20: connector

21: housing

21a: opening

21b: contact insert

P: circuit board

H: through hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference fitting contact press-fitted into an electrically conductive through hole provided in a circuit board or the like and used for electrical connection, and an interference fit connector using the same.

Connectors used in various electronic devices generally have a housing and contacts held therein. The connector is used to electrically connect the contact to the wiring of a circuit board mounted on an electronic device. However, in recent years, a connector of an interference fit type has been used as a contact in terms of solder free and work efficiency.

This kind of contact includes a needle hole type contact for interference fit. This needle hole type contact for interference fit is also described in Patent Literature 1 below, and has an elongated plate shape as shown in FIG. 1, and an introduction portion 101 at the tip and an interference fit portion 102 extending from the introduction portion. It is to be provided. The introduction portion 101 is narrow and extends in a straight line, and the interference fit portion 102 extends in a wide width extending in an arc shape from the introduction portion 101. Further, in the center of the interference fitting portion 102, slits 103 having a long and thin shape along the outer shape of the interference fitting portion 102 are formed, and the interference fitting portion 102 is shaped like a needle hole. have. In other words, the contact 100 is formed from the introduction portion 101 extending in a straight line of the distal end portion into two arced fitting portions 102 branched so as to extend on both sides in an arc shape, and then integrated again to reduce the diameter. have.

Such a contact 100 is inserted from the inlet 101 into a through hole formed in a circuit board, for example, and a wide interference fit portion 102 is forced into the slit 103 in the through hole by press-fitting. It is displaced and held and connected by pressing the inner wall of the through-hole. Therefore, the width of the interference fitting portion 102 is narrower than the inner diameter of the through hole at the connection portion with the introduction portion 101, and then gradually expands in an arc shape to become wider than the inner diameter of the through hole, and then again to the inner diameter of the through hole. It is narrow.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-148271 (see the third and fourth paragraphs and FIGS. 1 and 2).

When the conventional needle hole type contact 100 is press-fitted into the through-hole, when pressed in the inclined direction with respect to the through-hole or press-fitted by an improper pressing force, the contact 100 is not forcibly deformed in the through-hole and is forcibly inserted. There is a problem that buckling and cracking are likely to occur in the fitting portion 102, and as a result, there is a risk of poor connection.

The present invention does not inhibit proper deformation of the interference fitting portion when pressed into the through hole, and prevents buckling and cracks from occurring in the interference fitting portion even when obliquely inserted into the through hole, thereby enabling good electrical connection. An object of the present invention is to provide an interference fit contact of a needle hole type and a connector using the same.

As a result of intensive studies to solve the problems described above, the inventors have provided a thin projecting portion to cover at least a part of the slit in the interference fitting portion in the needle-hole type interference fitting contact. In this case, proper deformation occurs when press-fitted into the through-hole, so that the press-fitting can be improved smoothly, and the strength of the interference fit portion can be improved, and the stress can be properly distributed even when inserted at an angle, thereby buckling or cracking the interference fit portion. It discovered that this can be prevented.

That is, the present invention has a thin linear introduction portion and an interference fit portion extending in a planar wide width from the introduction portion, wherein the interference fit portion is press-fitted into the through hole and used in the interference fit portion from the front surface thereof. A slit portion penetrating to a rear surface thereof is formed, and a protrusion having a thin thickness projecting from the front surface of the interference fitting portion is formed so as to cover a part or all of the slit portion.

According to this interference fit contact, since the protrusion which covers a part or all of the slit part of the interference fit part is provided, the strength of the interference fit part can be improved, and since the protrusion is formed thin, it press-fits into the through hole. In one case, it is possible to reduce the interference between the interference fit portion by narrowing the width of the slit portion and the narrow deformation, and to press-fit into the through hole as appropriate. As a result, even if the press fitting is obliquely inserted into the through-hole, the interference fitting portion can be buckled or cracks can be prevented from occurring in the interference fitting portion, and good electrical connection can be achieved.

In addition, since the protrusion is deformed to expand outward when the interference fitting portion is deformed to narrow the slit portion to narrow the width when the contact is pressed into the through hole, the degree of protrusion of the protrusion after pressing into the through hole is observed. As a result, the degree of indentation can be confirmed, and it can be an index for checking whether the interference fit contact is properly indented and well connected.

In the interference fit contact of the present invention, the protrusion is formed so as to cover a part of the slit part, and another protrusion having a thin thickness protruding from the rear surface of the interference fit part is formed so as to cover a part of the slit part. You may. That is, since the protrusions covering a part of the slit portion are provided on both the front and rear surfaces of the interference fitting portion, the stress at the time of press-fitting into the through-hole can be more balanced, and the force-fitting when pressing into the through-hole is performed. It is possible to more significantly prevent the buckling of the portion, the occurrence of cracks in the interference fit portion, or the occurrence of connection failure.

The protrusion may cover the lower portion of the slit portion, the other protrusion may cover the upper portion of the slit portion, and may be formed spaced apart from the protrusion. That is, two projections covering part of the slit portions at the front and rear of the interference fitting portion are installed apart from the upper and lower portions of the slit portion so that the two projection portions expanded in opposite directions from each of the front and rear surfaces of the interference fitting portion are formed of one sheet of metal plate. It can form by press working, can simplify the manufacturing process of a contact, and can improve productivity.

The present invention also includes an interference fit connector formed by holding the interference fit contact made in this way in the connector housing.

According to this interference fit connector, the direction is deviated from a predetermined direction due to an external stress applied to the interference fit contact, or is kept slightly deviated from a predetermined position when the interference fit contact is held in the connector housing. Even in this case, since the projection of the interference fit contact can reduce or prevent the occurrence of buckling or cracking of the interference fit portion, the electrical connection can be favorably pushed into the through hole. In addition, even if a slight error occurs in the arrangement position (arrangement interval) when the plurality of interference fit contacts are placed and held in the connector housing, the gaps are formed in the formation intervals of the through-holes that press-fit these interference fit contacts. Even if a slight error occurs, the electrical connection can be similarly well pressed into the through hole.

Hereinafter, the features of the present invention will be described in more detail by showing preferred embodiments for carrying out the present invention.

2 and 3 show an interference fit contact (hereinafter referred to as a contact) 10 according to the present invention. The contact 10 has an inlet 11, an interference fit 12, and a lead 18 from the tip. The inlet portion 11 has a thin line bar shape in which both ends are tapered in shape so that the tip is tapered. The inlet portion 11 is inserted into the wiring through hole of the circuit board to guide the interference fit portion 12 into the through hole. The width and thickness of the through holes are narrower than that of the through holes.

The interference fitting portion 12 is a portion that is deformed (forcedly deformed) to be narrowed by being pressed into the through hole as an electrical connection terminal provided on the circuit board, held in the through hole, and electrically connected. It is also gradually expanded in line symmetry to widen the width, and then again the diameter is reduced and the width is narrowed to extend and then connected to the lead-out portion 18. In addition, in the interference fitting portion 12, a slit 15 penetrating from the front surface to the rear surface of the center portion is formed along the extension direction. In other words, the interference fitting portion 12 has two branching portions 13 and 14 branched from the inlet portion 11, and these branching portions 13 and 14 are again combined as one in the lead-out portion 18. . At this time, the two branched branches 13 and 14 may be connected to the lead-out unit 18 after recombination. These branch portions 13 and 14 are formed to have a narrower width than the inlet portion 11, so that they are easily deformed when pressed into the through holes.

The first protrusion 16, which is thinner than other portions, is provided to cover the lower portion of the slit portion 15 on the front side of the interference fitting portion 12. As shown in FIG. The first protrusion 16 covers the slit 15 from its lower end to almost the center, i.e. to connect the lower part of one branch 13 and the lower part of the other branch 14. It is expanded so as to protrude in a direction (see FIGS. 3A, 3C and 3D). Moreover, similarly to the 1st protrusion part 16, the 2nd protrusion part 17 which is thin is provided so that the upper part of the slit part 15 may be covered in the back surface side of the interference fitting part 12. As shown in FIG. The second protrusion 17 has a rear surface to cover the slit portion 15 from its upper end to approximately the center portion, that is, to connect the upper portion of one branch portion 13 and the upper portion of the other branch portion 14. It is expanded so as to protrude in a direction (see FIGS. 3B to 3D). These first protrusions 16 and the second protrusions 17 are slightly spaced apart from the center portion of the slit portion 15, and the spaced apart portions 15a of the center portion of the slit portion 15 have an interference fit portion ( It is a hole penetrating straight from the front to the back of 12). Since the first protrusion 16 and the second protrusion 17 improve the strength of the interference fitting portion 12 and are formed to be thin and protrude outward, the interference fitting portion 12 penetrates. Proper forced deformation caused when pressed into the hole is not impeded.                     

The interference fit portion 12 thus formed protrudes in both sides in a plane from the introduction portion 11, which is narrower than the inner diameter of the through hole to be press-fitted, until the width becomes wider than the inner diameter of the through hole. It extends in an arc or straight line to extend, and then the diameter is reduced in an arc or straight line to a width dimension substantially equivalent to the inlet portion 11, and is almost elliptical when viewed as a whole in the plane.

The slit portion 15 is gradually widened from the lower end (tip) to both sides in a planar and linear symmetry so as to almost follow the outer circumference of the interference fitting portion 12, and is formed in a wide width. It is elliptical, and the width dimension of the two branch parts 13 and 14 becomes substantially uniform throughout.

The lead-out section 18 is connected to the interference fitting section 12 and draws electrical signals from a circuit board or the like to the outside, and is formed almost in a spherical shape, but is used as a contact for a general connector, for example, a wire. It can be processed and used in various arbitrary shapes, such as the shape of the crimping | compression-bonding part to connect, the shape of mass connectors, such as a cylindrical shape.

The contact 10 thus formed is formed by punching a conductive metal plate, such as copper or copper alloy, having a substantially uniform thickness, using a suitable mold, and simultaneously, or afterwards, rolling by pressing to form the first and second protrusions. (16, 17) can be manufactured by forming a thin thickness. Moreover, it can also manufacture by joining a pair of electroconductive metal plate punched and pressed to a predetermined shape using a suitable metal mold | die.

In the above embodiment, the pair of first and second protrusions 16 and 17 are provided in the interference fitting portion 12, but in the interference fitting contact of the present invention, at least part of the slit portion 15 is provided. The protrusions may be provided so as to cover, for example, only one of the first and second protrusions may be provided, and the entire slit portion 15 is covered on the front side or the rear side of the interference fitting portion 12. It may be provided with a protrusion so as to.

Next, the forced deformation in the case where the above-described contact 10 is used by press-fitting into the through-hole of the circuit board will be described. As shown in FIG. 4A, a substantially circular through hole H provided in the circuit board P (although not shown, a conductive layer connected to a circuit pattern on the circuit board P is formed inside the through hole H). Formed on the wall surface], and the outer edge of the interference fit portion 12 contacts the opening edge of the through hole H by inserting the contact 10 from the introduction portion 11 thereof. Thereafter, by pressing downward (arrow a), the interference fitting portion 12 is compressed and press-fitted into the through hole H. As shown in FIG. At this time, the slit 15 is pushed from the left and the right so that it is crushed so that one branch 13 and the other branch 14 are approached, as shown in Figs. 4B and 4C. The first and second protrusions 16 and 17 are deformed to increase the expansion toward the outside (the direction of the arrow b in the first protrusion 16 and the direction of the arrow c in the second protrusion 17), thereby interfering with each other. The fitting part 12 is press-fitted so that it may be located in the through-hole H. That is, the contact 10 is press-fitted while the interference fitting portion 12 is deformed in contact with the opening edge of the through hole H, and the first and second protrusions are deformed according to the deformation of the interference fitting portion 12. (16, 17) is deformed to increase the degree of expansion. In addition, the first protrusions 16 and the second protrusions 17 provided in the interference fitting portion 12 are in an expanded state thereof, and are in contact with the inner wall surface of the through hole H, so that the contact 10 ) May be inserted into the through hole H up to a predetermined position. The size, shape, and the like of each part of the interference fit portion 12 and the like of the contact 10 may be appropriately determined according to the size or shape of the diameter of the through hole H, and the contact 10 is connected to the through hole H. When press-fitted in the inside, it is preferable that the first and second protrusions 16 and 17 have a size and shape such that they are inserted or press-fitted in the through-holes H while increasing the expansion.

Thus, the degree of expansion and the deformation state of the first and second protrusions 16 and 17 which increase the position and expansion of the interference fit portion 12 when the contact 10 is pressed into the through hole H are described, for example. It can confirm by observing the through-hole H from the back surface (lower surface) of the circuit board P. FIG. At this time, the position of the interference fitting portion 12 with respect to the through hole H and the degree of expansion of the first and second protrusions 16 and 17 are used to indent the contact 10 into the through hole H. Know the condition. That is, as shown in FIG. 4C, the interference fitting portion 12 is located at substantially the center portion of the through hole H, and the first protrusion 16 and the second symmetry are substantially symmetrical with respect to the interference fitting portion 12. If the projection part 17 is expanded, it can be judged that it is appropriately press-fitted.

Next, an example of a connector using the contact 10 will be described. As shown in FIG. 5, the connector 20 includes a housing 21 made of an insulating resin and a contact 10. The housing 21 is almost spherical, and on one end face is formed a pair with this connector 20, and the opening part 21a for inserting and attaching the contact of the other connector attached to and used by this is formed, and the other On the end face, four slit-shaped contact insertion holes 21b for press-fitting and holding the contact 10 are formed in parallel from the other end face toward the opening 21a. In addition, an end portion 21c is formed on the lower surface of the housing 21 so as to divide the central portion into two stages, while the upper surface formed by the end portion 21c is positioned when the connector 20 is mounted on the circuit board. A pair of projections 21d for protruding are formed between the contact insertion holes 21b.

Here, the contact 10 is formed with an elongate spherical shape of the lead portion 18, and the three introduction portions 11 and the interference fitting portion 12 are equally spaced at a predetermined pitch from the lower edge near the one end. It is formed so as to extend in parallel. Then, the contact 10 is press-fitted into each of the four contact insertion openings 21b in the housing 21 from the other end of the housing 21, so that the introduction portion 11 and the interference fitting portion 12 of the contact 10 are pressed. Are arranged in three rows and four columns on the upper surface of the lower surface of the housing 21 and protrude.

The connector 20 formed as described above has the end edges of the circuit boards at the end portions 21c with respect to the circuit boards in which the through holes for contacting the contact press-fit wires and the through holes for positioning are formed at edge portions at predetermined intervals. It is mounted and used so as to be stored so as to be opposed to the recessed portion on the lower surface side of the housing 21 formed by the end portion 21c.

According to the present invention, since the strength of the interference fit contact can be improved and the interference fit portion can be well press-fitted and deformed, the interference fit portion is buckled or a crack is generated in the interference fit portion. It can alleviate or prevent it, and good electrical connection can be aimed at.

In addition, the degree of indentation can be confirmed by the protrusion of the protrusion provided on the interference fitting portion.

Claims (4)

An interference fit contact having a linear introduction portion and an interference fit portion extending from the introduction portion to a wider width than the introduction portion, and press-fitted into a through hole, wherein the contact fit is used. The interference fitting portion is provided with a slit portion penetrating from the front surface to the rear surface, protruding from the front surface of the interference fitting portion so as to cover part or all of the slit portion, and the width of the slit portion when pressed into the through hole is increased. The protrusion is thin so that the narrow deformation is not inhibited, The protruding portion is deformed to increase the expansion toward the outside according to the deformation of the interference fitting portion when the interference fitting portion is deformed by contacting the through hole, and pressed against the inner wall surface of the through hole. An interference fit contact. 2. The width of the slit portion as set forth in claim 1, wherein the protruding portion is formed to cover a portion of the slit portion, and protrudes from the rear surface of the interference fitting portion so as to cover a portion of the slit portion, and the width of the slit portion when pressed into the through hole. An interference fit contact, characterized in that a further thin protrusion is formed so that the narrow deformation is not inhibited. The interference fit contact according to claim 2, wherein the protruding portion covers the lower portion of the slit portion, the other protruding portion covers the upper portion of the slit portion, and the protruding portion and the other protruding portion are spaced apart from each other. An interference fit connector made by holding the interference fit contact according to any one of claims 1 to 3 in a connector housing.

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