JP2555652B2 - Connector manufacturing method - Google Patents

Description

The present invention relates to a connector for surface mounting, and more particularly to a method of manufacturing a connector having a low-profile and high-density contact arrangement, which is surface-mounted on a printed board on a mother board. In order to provide a surface-mounting connector for the card edge, which has a low profile, the contact surface connection terminal parts are arranged with high accuracy, and there is little variation in height position, the card is inserted in the upper part. A contact insertion member having a substantially T-shaped contact insertion groove having a wide portion at the bottom and vertically penetrating the card insertion opening and outer walls on both sides of the card insertion opening, and an inverted J-shape at the top. When inserting a plurality of contacts each having a bent contact part, a wide fixing part in the middle, and a surface connecting terminal part that is obliquely led out at the bottom, the surface connecting end is extended downward from the fixing part. The narrow connecting portions of the plurality of contacts, which are connected to each other via a connecting portion in which the child portion is cut and raised and a narrow connecting portion that extends downward from the connecting portion and has a narrower width than the fixing portion, The contact insertion groove is inserted into the contact member from the side surface of the installation member, and the fixing portion is press-fitted into the wide portion from above to be implanted in the contact installation member.

[Industrial applications]

The present invention relates to a surface mount connector, and more particularly to a method for manufacturing a connector having a low-profile and high-density contact arrangement.

With the miniaturization of electronic equipment, the electronic components mounted on the printed circuit board are also downsized, and the mounting method is also surface mounting that does not have through holes for inserting lead wires in the printed circuit board and is connected to the surface connection pads by soldering, etc. (SMT; Surface Mount Techno
logy) has become popular.

Therefore, a structure suitable for surface mounting is also required for a connector mounted on a printed board, and various connectors have been proposed.

And recently, in order to connect a daughter board card mounted on a printed circuit board for a mother board and mounted with a high density of LSIs, etc., there is a demand for a card edge type surface mount connector that uses the contact pad of the card as a male side contact. However, there is a demand for miniaturization and higher density.

[Conventional technology]

FIG. 3 is a perspective view showing a conventional surface mounting connector.

In the figure, 1 is a card edge type surface mounting connector, 4 is a daughter board side card to be inserted into the connector 1, and 5 is a motherboard side printed board on which the connector 1 is mounted by surface mounting.

The connector 1 has a plurality of contacts 3'planted in two rows on a contact setting member 2'made of a molded product of an insulating material. The contact 3'is a substantially L-shaped member formed by pressing a spring plate material, and a contactor portion 31 'for pressing the contact pad 41 of the card 4 to contact the upper part.
A fixed portion 32 'is formed at the base of the contact portion 31', and a surface connection terminal portion 33 'is formed on the lower portion of the contact portion 31' for surface connection to the connection pad 51 on the surface of the printed board 5 to be mounted by reflow soldering or the like. The contact portions 31 'are arranged in the printed board insertion opening 21' of the contact installation member 2'to face each other so as to sandwich both sides of the printed board 4.

Assembling such a connector requires a plurality of contacts 3 '.
Are manufactured in a state in which they are connected to each other at a predetermined pitch by a connecting portion 34 'at the tip of the surface connection terminal portion 33', and are inserted from below the contact installation member 2 ', and then the connecting portion is cut to form individual contacts. And press like P, contact setting member
It was planted at 31 '.

Then, the connector 1 is mounted on the printed board 5, heated by infrared rays or high temperature gas, and provided on the surface of the printed board 5 corresponding to the arrangement of the surface connection terminal portions 33 ', and solder paste or the like is applied thereto. It is mounted by being reflow-soldered to the existing soldering pad 51.

In this way, when the daughter board side card is inserted into the connector 1 mounted on the printed board 5 on the mother board side,
Depending on the plate thickness of the card 4, the contacts 3 facing each other are deflected in directions away from each other, and the contact pads 41 are pressed by a predetermined contact force to form a connection.

[Problems to be solved by the invention]

In conventional connectors, the contact pitch is 2.54
Since it is as large as about mm, the width of the surface connection terminal can be widened and the rigidity of the connection part is large, so even when handling with the tip of the surface connection terminal connected in the contact manufacturing process such as pressing or plating. There was little variation in the arrangement pitch of the upper ends of the contacts, and it was possible to insert them all at once into the contact installation member.

However, at a high contact pitch of about 1.27 mm, the connection pad, that is, the soldering area becomes smaller, so the fixing force becomes weaker and the peeling stress on the soldered part caused by the variation in the height direction of the surface connection terminals is reduced. Therefore, it is necessary to reduce the width of the surface connection terminal portion. For this reason, the rigidity of the surface connection terminal portion decreases, so that when the surface connection terminals are connected at the tips as in the conventional case, the arrangement pitch of the upper ends of the contacts varies greatly, and it becomes impossible to insert them collectively into the contact installation member. There was a point.

Further, in the prior art, when the contact is press-fitted into the contact installation member, the root of the surface connection terminal portion is pressed, so the bending angle of the surface connection terminal portion changes and the surface abutting on the connection pad of the printed board fluctuates up and down. There was also the problem that they were not on the same plane.

Further, in a card edge type connector into which a card made of a laminated printed circuit board or the like is directly inserted as a mating plug, the mating plate thickness fluctuates greatly, so the amount of deflection of the contact spring part fluctuates. . It is desirable that the stiffness, which is the ratio of the force and the displacement, is small in order to suppress the variation in the contact force against the variation in the deflection amount.

The conventional card edge type surface mounting connector employs a simple cantilever spring as the shape of the spring portion, and the stiffness is reduced by increasing the length of the spring. Therefore, there is also a problem that the height of the connector cannot be lowered.

The present invention has been made in view of the above problems, and has a low profile when mounted on a printed circuit board on the motherboard side, and the terminal portions of the contacts are arranged with high accuracy, and the variation in height position is small. An object is to provide a surface mount connector for an edge.

[Means for solving problems]

The above-mentioned conventional problem is that a card insertion slot made of an insulating material into which a card is inserted and an outer wall on both sides of the card insertion slot are provided with a substantially T-shaped contact insertion groove having a wide portion at the bottom. The contact installation member that is formed to penetrate through is formed of a spring material and has a contact part bent in an inverted J shape at the top, a wide fixed part in the middle, and drawn obliquely from the lower end of the fixed part to the lower part. When inserting a plurality of contacts each having a surface connection terminal portion, the connecting portion extends downward from the fixing portion and the surface connecting terminal portion is cut and raised, and the fixing portion extends downward from the connecting portion. The narrow connecting portions of the plurality of contacts, which are connected to each other through a narrower narrow connecting portion, are inserted into the contact insertion groove from the side surface of the contact installation member, and the fixing portion is formed into the wide portion. Press in from above and Is solved by the method connector of the present invention, characterized in that implanting the transfected installation member.

[Action]

By forming the spring portion into an inverted J-shape, the contact can be shortened without increasing the stiffness, and the connector can be reduced in height. Since the connection is made below the fixed portion, the rigidity of the surface connection terminal portion can be reduced regardless of the connection strength. Further, since a plurality of contacts can be simultaneously incorporated in the contact installation member without applying a force to the surface connection terminal portion, variations in height position of the surface connection terminal portion are reduced, and the same surface of the soldering surface to the printed board can be obtained. Is improved.

〔Example〕

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

FIG. 1 is a diagram of a connector according to an embodiment of the present invention, and FIG. 2 is a diagram showing a method of incorporating contacts.

FIG. 1A is a partially cutaway top view as viewed from the card insertion side, and FIG. 1B is a sectional view taken along line AA.

In FIG. 1, a connector 6 is a contact installation member 7 made of a molded product of an insulating material and having a substantially square cross section.
In addition, a plurality of contacts 8 formed by pressing a spring plate material are planted in two rows facing each other at a predetermined pitch.

A card insertion opening 71 having a bottom portion 71a against which the tip of the card 4 to be inserted abuts is formed in the contact installation member 7 continuously in the longitudinal direction (the direction perpendicular to the paper surface in FIG. 7B) so as to face upward. At a plurality of positions corresponding to the arrangement pitch of the contacts 8 on both sides of the card insertion opening 71, notches 73a and 73b for accommodating the contactor portions 81 of the contacts 8 are formed on the upper surface and the inner wall, and on the outer wall. Wide part at the bottom of narrow part 72b
Substantially T-shaped contact insertion groove that has 72a and penetrates vertically
2 and are formed. In this case, the width of the narrow portion 72b is narrower than the width of the fixing portion 82 of the contact 8 described later, and the narrow connecting portion 86 is formed.
Wider than the width of. The contact 8 has a contact portion 81 which is in contact with the contact pad 41 of the card 4 to be inserted and which is bent in an inverted J shape, an intermediate fixing portion 82 wider than the contact portion 81, and a fixing portion 82 at the lower portion. The surface connecting terminal portion 83 is narrower than the fixing portion 82 that is slanted downwardly from and is horizontal at the lower end. The fixing portion 82 is press-fitted into the wide portion 72a of the contact insertion groove 72, and the contact setting member 7 Has been planted in. By thus forming the contactor portion 81 in an inverted J-shape, the height of the contact can be reduced while ensuring the substantial spring length, and the bottom of the connector can be realized.

As shown in FIG. 2, the contact 8 is formed such that its surface connection terminal portion 83 is cut and raised from a connecting portion 84 extending downward with substantially the same width as the fixing portion 82, and the connecting portion is also formed.
It is formed by continuous pressing from thin leaf spring material strips at a pitch P equal to or an integer multiple of the arrangement pitch of the contact insertion holes 72 by a narrow connecting portion 86 extending further downward from 84. As described above, since the plurality of contacts 8 are connected to each other via the connecting portion 84 and the narrow connecting portion 86 which are independent of the surface connecting terminal portion 83, the width of the surface connecting terminal portion 83 is narrowed to reduce the rigidity. However, the arrangement pitch on the upper end side of the contacts 8 does not vary in the manufacturing process such as pressing or plating, and the contacts 8 can be collectively attached to the contact setting member 7.

Further, when the contact 8 is assembled, as shown in FIG. 2, the narrow connecting portions 86 of the plurality of contacts connected as described above are connected to the narrow portion 72b of the contact inserting groove 72 from the side surface of the contact setting member 7 as shown by an arrow B. After being passed through and positioned in the wide portion 72a, by pulling it downward as shown by an arrow C, the wide fixing portion 82 is formed so that the wide fixing portion 82 of the contact insertion groove 72 is formed.
It is pressed into a from above and is planted in the contact setting member 7. Then, the notch 85 separates the connecting portion 84 to form the individual contacts 8.

The above-described contact assembling step can be performed without applying force to the surface connection terminal portion 88, so that the delicate surface connection terminal portion 83 is not deformed and the arrangement accuracy (flatness) of the surface connection terminal portion 83 is excellent. A connector is obtained.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide a card edge type connector for surface mounting in which surface connection terminals having high contact density, low height, and low rigidity are arranged with high accuracy. Contribution to miniaturization and high density of electronic devices is remarkable.

[Brief description of drawings]

FIG. 1 is a diagram of a connector according to an embodiment of the present invention, FIG. 2 is a diagram showing a method of incorporating contacts, and FIG. 3 is a perspective view showing a conventional surface mounting connector. In the figure, 6 ... Connector, 7 ... Contact installation member, 71 ... Card insertion slot, 71 ... Contact insertion groove, 72a ... Wide part, 72b ... Narrow part, 8 ... Contact, 81 ... Contact part, 82 ... fixed part, 83 ... surface connection terminal part, 84 ... connection part, 86 ... narrow connection part, 4 ... card, 41 ... contact pad, 5 ... printed board is there.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyoichiro Kono 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Ikuhiro Ando, 1015, Kamedotachu, Nakahara-ku, Kawasaki, Kanagawa Prefecture Fujitsu Limited

Claims (1)

(57) [Claims] 1. A method for manufacturing a connector for surface mounting, comprising a plurality of surface connection terminals connected to the surface of a printed board in a plane orthogonal to the insertion direction of the card, which is made of an insulating material and has a card on top. On the outer wall on both sides of the card insertion opening (71) and the card insertion opening (71)
The contact installation groove (72) having a substantially T-shaped contact insertion groove (72) having a wide portion (72a) at the bottom is formed by vertically penetrating the contact installation member (7), which is made of a spring material and has an inverted J shape at the top. A bent contact part (81), a wide fixing part (82) in the middle, and a surface connection terminal part (8) extending obliquely from the lower end of the fixing part (82) to the lower part.
When a plurality of contacts (8) having (3) and (3) are incorporated, a connecting portion (84) extending downward from the fixing portion (82) and having the surface connection terminal portion (83) cut and raised, and the connecting portion. (84)
The narrow connecting portions (86) of the plurality of contacts (8) extending downward from the connecting portions via narrow connecting portions (86) having a width narrower than that of the fixing portion (82). Inserting the contact insertion groove (72) from the side surface of (7), press-fitting the fixing portion (82) into the wide portion (72a) from above, and implanting in the contact setting member (7). A method of manufacturing a characteristic connector.