JPH01183081A - Manufacture of connector - Google Patents

Abstract

PURPOSE:To reduce the height of a connector without increasing its stiffness by forming a contact part to contact a contact head of an inserted card in the form of S. CONSTITUTION:A contact 3 is formed of a contact part 31 in the upper part, a fixed part 32 in the middle, and a surface connection terminal part 33 at the lower end. The contact part 31 is of spring material and bent in the form of S to contact a contacting point 41 of a card 4 which is inserted. The fixed part 32 is wider than the contact part 31, and its lower part is led down diagonally to be horizontal at the lower end. It is then connected with the terminal part 33 which is narrower than the fixed part 32. In assembling the contact 3, a plurality of the contacts 3 formed in connection with each other are inserted into a contact inserting hole 22, and each fixed part 32 is fitted into a wide part 22a of the inserting hole 22. Then connecting part 34 is cut off by means of a notch, so the contact is planted in a contact installing member 2. By thus forming the contact part 31 in the form of S, a spring length can be secured, while the height of the contact 3 is reduced, thereby height reduction can be realized.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a surface-mount connector, which is particularly low-profile and
Regarding the manufacturing method of a connector with a high-density contact arrangement, we have developed a card edge that has a low profile when surface mounted on a printed circuit board on the motherboard side, and has a highly accurate arrangement of the surface connection terminals of the contacts and small variations in height position. The purpose of the present invention is to provide a surface mount connector for use with a contact installation member, which has a card insertion hole in the upper part and a contact insertion hole with a wide part formed from below on both sides of the card insertion hole; When assembling a plurality of contacts each having a contact portion bent in an S-shape, a wide fixed portion in the middle, and a surface connection terminal portion led out diagonally from the lower end of the fixed portion at the bottom, Inserting the plurality of contacts, which are connected through connecting portions in which the surface connecting terminals are cut and raised, into the contact insertion hole from below, and press-fitting the fixing portion into the wide portion of the contact insertion hole. It is configured by being implanted in the contact installation member.

[Industrial application field]

The present invention relates to a surface mount connector, particularly a low profile connector.
The present invention relates to a method of manufacturing a connector having a high-density contact array.

Along with the miniaturization of electronic devices, the electronic components mounted on printed circuit boards have also become smaller, and the method of mounting them has become surface mount, in which they are connected to connection bands on the surface by soldering, etc., without providing through holes for inserting lead wires on the printed circuit board. (SMT, 5urfac
e-Mount Technology) has come into widespread use.

For this reason, connectors mounted on printed boards are required to have structures suitable for surface mounting, and various connectors have been proposed.

Recently, card edge type surface mount connectors have been developed that are mounted on printed circuit boards for motherboards and use the contact pads of the cards as male contacts in order to connect cards for daughter boards in which LSI etc. are mounted in high density. There is a strong demand for miniaturization and higher density.

[Conventional technology]

The last figure is a perspective view showing a conventional surface mount connector.

In the figure, 1 is a card edge type surface mount connector, 4 is a card on the daughter board side that is inserted into the connector, and 5 is a printed board on the mother board side on which the connector is mounted in a surface mount manner.

The connector includes a plurality of contacts 3'' planted in two rows on a contact installation member 2'' made of a molded product of an insulating material. The contact 3' is an abbreviated member formed by pressing a spring plate material, and has a contact portion 31 on the top of which the contact pad 41 of the card 4 is pressed and contacted.
” and a fixing portion 32″ at the base of the contact portion 31″, and a connecting pad 51 on the surface of the printed board 5 to be mounted at the bottom.
A surface connection terminal part 33' is formed on the surface of the contact installation member 2' by reflow soldering, etc., and the contact part 31' is placed on the printed board of the contact installation member 2' so as to sandwich both sides of the printed board 4'. It is disposed within the insertion opening 21'.

To assemble such a connector, a plurality of contacts 3' are manufactured in a state in which they are connected at a predetermined pitch by connecting parts 34' at the tips of the surface connecting terminal parts 33', and the contact installation members 2
After the contacts were inserted from below, the connecting portions were cut to separate them into individual contacts, which were then pressed as indicated by P and implanted into the contact installation member 31''.

The connector 1 is placed on the printed board 5 and heated with infrared rays, high temperature gas, etc., and the surface connection terminal terminal portion 33 is heated.
Soldering pads 51 are provided on the surface of the printed circuit board 5 in accordance with the arrangement of ゛ and are coated with solder paste or the like.
It is reflow soldered and installed.

When the card on the daughter board side is inserted into the connector 1 mounted on the printed board 5 on the motherboard side in this way, the opposing contacts 3 are bent in the direction of separating from each other due to the thickness of the card 4, and the contacts 3 are connected with a predetermined contact force. The connection was formed by pressing the pad 41.

[Problem that the invention seeks to solve]

In conventional connectors, the contact pitch is 2.5
Because it is large at about 4 mm, the width of the surface connection terminal can be made wider, and the rigidity of the connection part is high. Even when handled, 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, when the arrangement pitch of contacts is high, such as 1.27 + n + n, the area of the connection pads, i.e., solder joints, becomes smaller, so the adhesion force becomes weaker, and the solder joints may peel off due to variations in the height direction of the surface connection ends ♀. In order to reduce stress, it is necessary to narrow the width of the surface connection terminal portion.

For this reason, the rigidity of the surface connection terminal portion decreases, so when connecting at the tip of the surface connection terminal as in the conventional method described above, there is a problem in that the arrangement pinch of the upper end of the contact varies greatly, making it impossible to insert the contact all at once into the contact installation member. There was a point.

In addition, in the conventional technology, when press-fitting a contact into a contact installation member, the base of the surface connection terminal part is pressed, so the bending angle of the surface connection terminal part changes, and the surface that contacts the connection pad of the printed board varies vertically. There was also the problem that they were not on the same plane.

In addition, in card edge type connectors in which a card made of a laminated printed circuit board or the like is directly inserted as a mating plug, the thickness of the mating plate varies greatly, which causes the amount of deflection of the spring portion of the contact to fluctuate. . In order to suppress contact force fluctuations to a small extent with respect to this deflection amount fluctuation, it is desirable that the stiffness, which is the ratio of force to displacement, be small.

The above-mentioned conventional card edge type surface mount 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. For this reason, there was also the problem that the height of the connector could not be lowered.

The present invention was created in view of the above problems, and has a low profile when surface mounted on a printed board on the motherboard side.
Another object of the present invention is to provide a surface mounting connector for a card edge in which terminal portions of contacts are arranged with high accuracy and variations in height position are small.

[Means for solving problems]

The above conventional problem is that the contact installation member is made of an insulating material and has a card insertion slot at the top into which a card is inserted and a contact insertion hole with a wide part formed from below on both sides of the card insertion slot. When incorporating a plurality of contacts made of a spring material, each having a contact part bent in an S-shape at the top, a wide fixed part in the middle, and a surface connection terminal part led out diagonally from the lower end of the fixed part at the bottom. Insert the plurality of contacts from below into the contact insertion hole, which extend downward from the fixed part and are connected through a connecting part in which the surface connection terminal is cut and raised, and insert the fixed part into the contact insertion hole. This problem is solved by the method of manufacturing a connector of the present invention, which is characterized in that the connector is press-fitted into the wide part of the connector and then implanted in the contact installation member.

[Effect]

By making the spring part S-shaped, the contacts can be shortened without increasing stiffness, and the connector can be made low 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. In addition, multiple contacts can be assembled into the contact installation member at the same time without applying force to the surface connection terminals, reducing variations in the height position of the surface connection terminals and allowing soldering to the printed circuit board on the same surface. Improves sex.

〔Example〕

The present invention will be explained in detail 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 connected state of contacts.

FIG. 1(a) is a partially cutaway top view, and FIG. 1(b) is A-
It is a view taken from the card insertion side when cut away as shown by arrow B in sectional view A.

In FIG. 1, 1 is a connector and 4 is a card to be inserted. - The connector 1 includes a contact installation member 2 made of a molded product of an insulating material and having a substantially rectangular side cross section, and a plurality of contacts 3 formed by pressing a spring plate material arranged in two rows facing each other with a predetermined pinch. It has been set up.

In the contact installation member 2, a card insertion slot 21 having a bottom portion 21a against which the tip of the card 4 to be inserted hits is continuously opened upward in the long horizontal direction (direction perpendicular to the plane of the paper in FIG. 2(b)). On both sides of the card insertion slot 21, a plurality of contact insertion holes 22 having ceiling portions 22b at the top are opened downward at a predetermined pitch. The contact insertion hole 22 is approximately rectangular with a wide portion 2 on one outer side.
It has 2a.

The contacts 3 are the contact pads 41 of the card 4 to be inserted.
An upper contact part 31 bent in an S-shape that contacts the contact part 31, an intermediate fixed part 32 wider than the contact part 31, and a fixed part 3 that leads diagonally downward from the lower fixed part 32 and becomes horizontal at the lower end.
The fixing part 32 is press-fitted into the wide part 22a of the contact insertion hole 22, and is implanted in the contact installation member 2. By making the contact portion 31 S-shaped in this way, the height of the contact can be reduced while maintaining a substantial spring length, and the connector can be made low in height.

As shown in FIG. 2, this contact 3 is formed by cutting and raising the surface connecting terminal portion 33 from a connecting portion 34 extending downward with approximately the same width as the fixed portion 32, and They are formed by connecting strips of thin plate spring material by continuous press working at a pitch P that is equal to or an integral multiple of the arrangement pinch of the contact insertion holes 22.

In this way, the plurality of contacts 3 are connected via the connecting part 34 independent of the surface connecting terminal part 33, so even if the width of the surface connecting terminal part t3 is narrowed to reduce the rigidity,
Contact 3 in manufacturing processes such as pressing and plating
There is no variation in the arrangement pinch on the upper end side of the
It becomes possible to insert the contacts into the contact installation member 2 all at once.

When assembling the contactor 3, the plurality of contacts connected and formed as described above are temporarily inserted into the contact insertion hole 22 from below at the same time, and then the connecting portion 34 is separated to form the individual contacts 3.

This cutting can be easily performed by simply bending the connecting portion 34 using a notch 35 formed in the fixed portion 32. Then, by pressing the notch cut surface at the lower end of the fixed part 32, all the contacts are pressed into the wide part 22a of the contact insertion hole 22, and the fixed part 32 is implanted into the contact installation member 2.

The above contact assembly process can be performed without applying force to the surface connection terminal part 33, so the delicate surface connection terminal part 33 is not deformed.
A connector with excellent arrangement accuracy (planarity) as shown in No. 3 can be obtained.

〔Effect of the invention〕

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 with high contact density, low height, and low rigidity are arranged with high precision. It is notable that it contributes to the miniaturization and higher density of electronic devices.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a connector according to an embodiment of the present invention, FIG. 2 is a diagram showing a connected state of contacts, and FIG. 3 is a perspective view of a conventional surface-mount connector. In the figure, 1--Connector, 2-Contact installation member, 21-Card insertion slot, 2
2-Contact insertion hole, 22a-wide part, 3-contact, 31-contact part, 32-fixing part,
33--Surface connection terminal portion, 34--Series connection portion, 4--Card, 41-Contact band, 5-Printed board. Agent Patent Attorney Sada Igata −

Claims (1)

[Claims] A method for manufacturing a surface mount connector having a plurality of surface connection terminals connected to the surface of a printed circuit board in a plane perpendicular to the card insertion direction, the connector being made of a spring material, A contact part (31) bent in an S-shape, a fixed part (32) wider than the contact part (31) in the middle, and a surface connection led out diagonally from the lower end of the fixed part (32) at the bottom. Terminal part (
33), when incorporating the plurality of contacts (3) having Insert the contact (3) from below into the contact insertion hole (22), press fit the fixed part (32) into the wide part (22a) of the contact insertion hole (22), and insert it into the contact installation member (2). A method for manufacturing a connector characterized by implanting the connector.