JP2629299B2 - Male connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a high-density connector, and more particularly to a male connector for surface mounting which has a small contact pitch and can be manufactured at low cost. The purpose of the present invention is to provide a male connector for surface mounting that reduces the number of parts by double-molding the contact area of the contact area and has a high-density and high-precision contact arrangement. An insulating base having a substantially inverted T-shape in cross section, comprising a base mounted on the surface of the printed board and an insertion portion projecting upward from the base and fitted into the female connector of the mating side; And a plurality of strip-shaped contact areas formed by double molding at a predetermined pitch so as to surround the contact area, and the surface of the contact area is coated with metal by electroplating. And Configurations.

[Industrial applications]

The present invention relates to a high-density connector, and more particularly to a male connector for surface mounting that has a small arrangement pitch of contacts and can be manufactured at low cost.

With the increase in the density of electronic devices, the number of terminals of connectors mounted on the printed board has increased and the density has been increasing. For this reason, the printed board to be mounted has no through holes for inserting terminals, and connection pads on the surface of the printed board In recent years, surface mounting for directly soldering terminal portions of connectors has been widely used.
It is required to provide such a connector at low cost.

[Conventional technology]

FIG. 4 shows a conventional general male connector for high-density surface mounting.

In the figure, a male connector (plug connector) 1
Is an insulating substrate 11 made of an insulating resin molded product.
And a plurality of contacts 12, which are reflow soldered to the soldering pads 41 of the printed board 4.

A plurality of contact press-fit holes are formed in the insulating base 11 at a predetermined pitch, and the contact portions 12 are separately manufactured from a metal material such as a copper alloy through press working or continuous plating.
a and a contact 12 having a terminal portion 12c for surface mounting are press-fitted and implanted.

[Problems to be solved by the invention]

Due to the high density of electronic devices, the arrangement pitch of contacts has been reduced from the conventional standard of 2.54 mm to, for example, half that of 1.27 mm.
(Half-pitch connector) is becoming standard. However, when the contact pitch is reduced in this way, in the conventional male connector for press-fitting and fixing the contact, the partition wall between the contact press-fitting holes of the insulator becomes thin, and the contact is planted. There was a problem that press-fit cracking sometimes occurred.

In addition, as a constituent member, an insulating base formed by a molding process and a plurality of contacts formed by press working or continuous plating are required, so that the number of parts is large, and assembly for implanting the contacts on the insulator is required. There is also a problem that the cost is increased because a process is required.

Furthermore, it is desirable that the terminal portions of a plurality of contacts are arranged with high accuracy in the same plane in order to perform reflow soldering at the time of mounting on a printed board well.
There is also a disadvantage that the accuracy is poor because individual contacts are planted.

The present invention has been made in view of the above problems, and is intended for a surface mount having a high-density and high-precision contact arrangement by double-molding a conductive resin contact on an insulating substrate to reduce the number of components. The purpose of the present invention is to provide a male connector.

[Means for solving the problem]

In order to achieve the above object, as shown in FIG. 1, the present invention provides a base 21 made of a molded product of a non-platable resin, which is surface-mounted on a printed board, and which projects upward from the base 21 to form a mating part. An insulating base 24 having a substantially inverted T-shaped cross section including an insertion portion 22 to be fitted into the female connector, and a plurality of strip-shaped contact areas formed by double-molding an electroplatable resin at a predetermined pitch so as to surround the outer circumference of the insulating base 24. 23.

The surface of the contact region 23 has a structure in which a metal is deposited by electroplating.

[Action]

Since the contact area is formed integrally with the insulating base by plating with a resin that can be plated, there is no need to manufacture the contacts separately from the insulating base by pressing, or to implant the contacts in the insulating base, and Contacts can be arranged with high precision and high density.
For this reason, the basic component of the connector is only one molded product, and the manufacturing cost can be significantly reduced without reducing the cost of the members or the number of assembly steps. In addition, since it is not necessary to press-fit the contacts, it is possible to achieve a high-density contact arrangement.

〔Example〕

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an external perspective view of a male connector of the present invention, FIG. 2 is a sectional view of a contact region, and FIG. 3 is a view showing a manufacturing method.

In FIG. 1, the male connector 2 of the present invention is a rod-shaped molded integral molded product having a substantially inverted T-shaped cross section having a base 21 having a square cross section on the lower side and an insertion portion 22 protruding above the base 21. The lower surface 21a or the side surface 21b of the base 21 is a surface to be reflow soldered to the pad of the printed board, and the insertion portion 21
Is a plug portion to be fitted into the mating female connector.

Then, on the surface of the rod-shaped body, a plurality of strip-shaped contact regions 23 in which the groove 24a is filled with a conductive resin and plated with metal, as described later, are formed at an arrangement pitch of, for example, 1.27 mm around the outer periphery. I have.

FIG. 2 shows an AA cross section in FIG. 1 together with a mating female connector to show the layer configuration of the contact region.

In the figure, reference numeral 3 denotes a mating female connector to be inserted into the male connector 2 of the present invention. A plurality of female contacts 31 having a U-shaped spring contact portion 31a correspond to the arrangement pitch of the contact areas of the male connector. And are juxtaposed in the insulator 32.

The contact area of the male connector 2 is composed of a second molded part 25 formed in a band shape by plating a resin double mold around an insulating base 24 made of a first molded product made of a non-platable resin. 25 surfaces, for example, Cu
A metal plating layer 26 having a three-layer structure of Ni / Au is formed as a conductive material and a contact material to a desired thickness by potential plating.

Reference numeral 4 denotes a printed board on which the male connector 2 is mounted.
The soldering pad 41 on the front surface and the metal plating layer 26a on the lower surface of the base 21 having excellent flatness are satisfactorily soldered by the reflow solder.

In the portion other than the contact region 23 in FIG. 1, the first molded product of the insulator remains exposed on the surface, and since there is no metal plating layer, the contact region is independently a plurality of conductive portions. .

FIG. 3 shows an example of the manufacturing method. First, non-plating grade PPS (polyphenylene sulfide), which is an insulator
The insulating base 24 shown in FIG. 1A is formed by injection molding of a resin. (First Molding) The insulating base 24 has an insertion portion 22 having a thickness corresponding to the female connector on the mating side, and a plurality of belt-like portions surrounding the outer periphery at a predetermined arrangement pitch at a portion corresponding to the contact region. A groove 24a is formed.

Then, the insulating base 24 is attached to the second molding die, and a conductive plating-grade PPS resin is injection-molded into the plurality of grooves 24a by double molding, as shown in FIG. As shown in the part corresponding to the contact area,
A plurality of second molded portions 25 surrounding the insulating base 42 in a belt shape are formed.

Since the contact area is formed by the double mold as described above, the width and the arrangement pitch are governed by the precision of the mold, so that the contact area can be arranged with extremely high precision and the first molding resin and the second molding resin can be used. Since the boundary with the resin is melt-bonded, the bonding strength is large and it can be regarded as an integrally molded product.

Since the second molding is performed by a multipoint gate type mold in which the gate 25a is formed in each second molding portion 24, a plurality of contact regions are electrically connected by the gate 25a and the runner portion 25b. Thus, a molded article in a sunk state is obtained.

Next, using this runner part 25b as a plating electrode,
Electroplating is performed only on the second molded portion 25 where the surface of the conductive plating resin is exposed to form a contact region. By applying a plating voltage to the runner portion 24a,
Plating current can be easily supplied to a plurality of contact regions, and Cu and Ni / Au electroplating can be easily performed to a predetermined thickness.

By cutting the gate 25a after the plating step, a plurality of contact regions can be easily separated, and a plurality of contacts insulated from each other can be obtained.

〔The invention's effect〕

As described above, according to the present invention, it is possible to reduce the number of male connector parts to one, and it is not necessary to perform an assembling step of implanting contacts on an insulator, so that a high-density connector can be manufactured at low cost. It becomes possible.

[Brief description of the drawings]

 1 is an external perspective view of a male connector of the present invention, FIG. 2 is a cross-sectional view of a contact area, FIG. 3 is a view showing a method of manufacturing a male connector of the present invention, and FIG. FIG. In the drawing, 2 ... male connector, 21 ... base, 22 ... insertion, 23 ... contact area, 24 ... insulating base, 24a ... groove, 25 ... second molded part, 26 ... metal plating Layers.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-142689 (JP, A) JP-A-52-50587 (JP, A) Real opening Sho-61-141787 (JP, U)

Claims (1)

(57) [Claims] 1. A base (21), which is made of a molded product of a non-metallic resin and is surface-mounted on a printed board, and the base (21).
An insulating base (24) having a substantially inverted T-shaped cross section, comprising an insertion portion (22) projecting upward from the connector and fitted into a mating female connector.
And a plurality of strip-shaped contact regions (23) formed by double-molding an electroplatable resin at a predetermined pitch so as to surround the outer periphery of the insulating base (24). The surface of the contact region (23) A male connector, wherein a metal is applied by electroplating.