JPH046143Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention provides a method for mounting a contactor disposed on an insulating housing on a substrate surface such that a connecting portion thereof overlaps and contacts a conductor surface on the substrate surface. The present invention relates to a so-called surf S mount type electrical connector.

BACKGROUND ART In recent years, with the miniaturization, diversification, and automatic assembly of electronic devices, there has been a demand for higher density and automatic mounting of various electronic components on printed circuit boards. As an electrical connector to meet this demand, for example, a surf S-mount electrical connector as disclosed in Japanese Patent Application Laid-open No. 140688/1988 has been proposed and used. This type of surface-mount electrical connector is mounted on a printed circuit board, and the legs of the contacts (connecting parts) are overlapped and soldered to the circuit (conductive pads) provided on the top surface of the board. FIG. 9 of the accompanying drawings is a schematic sectional view showing a conventional example of this type of SURF S-mount type electrical connector, and as shown in FIG. 9, this SURF S-mount type electrical connector 3
is mounted on the circuit board 2, and the contacts 5A, 5B,
The legs 8 of 5C are connected to the circuit board 2 by reflow soldering after coming into contact with the conductive pads 2A. In this reflow soldering method, after forming the conductive pad 2A, that is, after applying cream solder to the circuit,
Usually, the soldering is done by heating the entire board and connector in a heating furnace, or by heating the legs with a laser, infrared rays, etc. to melt the solder. . In this way, the whole or a part is heated, but in that case, due to the difference in the material of the housing of the connector and the material of the board, the solder is used due to the difference in the coefficient of thermal expansion of each member during cooling after heating. After attachment, stress will be created between the contact foot and the pad. Even in the structure of the conventional connector shown in FIG. 9, such stress is absorbed to some extent because the arm 8 of the contact portion acts as a spring beam.

Problems to be Solved by the Invention However, the conventional surf S-mount electrical connector as described above has the following problems.

(1) Since the tail part 6 of the contactor extends bare from one end of the housing 4 and is not protected in any way, there is a risk that foreign matter may come into contact with it from the outside, causing the contactors to shoot each other or the tail part 6 to deform. be. Furthermore, during soldering, there is a possibility that the tail portion may be bent easily, and the pitch of the conductive pad and the pitch of the legs may be different, making solder connection impossible.

(2) In the case of a connector in which the contacts are arranged in multiple rows in the housing, the length of the arm 7 of the upper layer contact and the arm 7 of the lower layer contact will be different. Therefore, the degree of stress absorption during soldering differs between the upper layer contact and the lower layer contact, resulting in an imbalance in stress absorption. In other words, if the arm of the lower layer contactor is shortened to accommodate miniaturization, it becomes impossible to absorb stress, and if the arm of the lower layer contactor is lengthened to ensure stress absorption, the upper layer contact The child arm becomes unnecessarily long, the connector becomes large, and high density cannot be achieved.

The purpose of this invention is to solve these problems and
It is an object of the present invention to provide a surface mount type electrical connector which can be miniaturized and can evenly absorb stress even in a multi-layer array of contacts.

Means for Solving the Problems According to the present invention, a contact portion contacts the contact portion of the contact of the mating connector at one end, a connecting portion overlaps and contacts the conductor surface on the board surface at the other end, and a locking portion is located in the middle. A surf S-mount electrical connector comprising a plurality of contacts, each having a contact portion, arranged in an insulating housing such that the contact portions of each contact are arranged at at least two different levels, The locking portion of each contact includes a first locking portion provided closer to the contact portion of the contact, and a second locking portion provided closer to the connection portion of the contact. The area from the second locking part to the connecting part of each contact constitutes the rear end intermediate part of each contact, and the length of the rear end intermediate part of each contact is substantially The insulating housing is provided with a plurality of contact arrangement holes for arranging the respective contacts, and each of the contact arrangement holes is arranged in the contact portion of each contact. and a rear intermediate portion receiving groove for receiving the rear intermediate portion of each contact, each of the contact retaining holes being arranged at the at least two different levels. However, the respective rear end intermediate portion receiving grooves are all arranged at the same level lower than the at least two different levels, and the contact portion of each of the contacts is such that the first locking portion is connected to the contact holding portion. The second locking portion of each contact is locked in the contact holding hole by engaging with the wall of the hole, and each of the rear end intermediate receiving grooves locks the second locking portion of each contact into the wall of the hole. The middle part of the rear end,
The shape allows free movement in the left and right, front and back, or up and down directions between the second locking part and the connecting part.

Embodiments Next, the present invention will be described in more detail with regard to embodiments of the present invention based on FIGS. 1 to 9 of the accompanying drawings.

FIG. 1 is a perspective view showing a SURF S-mount electrical connector 1 as an embodiment of the present invention before it is mounted and connected to a circuit board 70. As shown in FIG. Second
The figure is a partially enlarged view showing the main part of the rear part of the connector 1 shown in FIG. 1. Figure 3 shows the connector 1 in Figure 1.
FIG. 2 is an enlarged perspective view, partially in section, of essential parts of the insulating housing 10 and the contactor 20 of FIG. FIG. 4 is a sectional view taken along line A--A in FIG. 2. As shown in these figures, the connector 1 mainly consists of an insulating housing 10
, a plurality of female contacts 20 , and a shield case 30
It is made up of.

The insulating housing 10 is integrally formed of an insulating material, and has a plurality of contact holding holes 11 at the front thereof, each having a tapered receiving opening 12 for receiving a male contact (not shown) of a mating connector. It is provided. The cross-sectional shape of the contact holding hole 11 is preferably substantially hexagonal, and the rear portion of the holding hole 11 is provided with a first locking portion provided at the intermediate portion 22 of the female contact 20. A groove 13 is provided for receiving 24. Furthermore, a recess 14 is provided at the rear of the insulating housing 10, and a female contact 2 is provided on the lower wall 15 of the recess 14.
a horizontal groove 16 for receiving the rear end 23 of 0 and a vertical groove 17 connected to the horizontal groove 16;
is configured. At the bottom of this horizontal groove 16,
Second locking portion 2 provided at the rear end of the female contact 20
A second wide horizontal groove 16' is provided for receiving the second horizontal groove 9. Furthermore, the insulation housing 1
On both sides of 0, there is a mounting part 1 that is approximately L-shaped.
8, 18 are provided, and these mounting parts 18,
18 is composed of a vertical mounting part 18A and a horizontal mounting part 18B, and the vertical mounting part 18A is provided with a through hole 18A-1 for receiving the threaded part 42 of the lock fitting 40. Part 18
A through hole 18B-1 for receiving the board mounting fitting 60 is provided in B (see FIG. 5).
A convex portion 18B-2 is provided around the lower end of the through hole 18B-1, which acts as a positioning member when attaching to the board 70. Further, a receiving groove 18A-2 for receiving an L-shaped fitting 50, which will be described later, is provided on the back surface of the vertical mounting portion 18A.
A receiving groove 18B-3 for receiving the L-shaped fitting 50 is preferably provided on the upper surface of the receiving groove 8B.

The female contactor 20 is formed by punching and bending a metal sheet material using a press.
As clearly shown in the figure and FIG. 4, there is a contact part 21 having a spring property for receiving the contact part of the male contact of the mating connector at its tip and making electrical contact, an intermediate part 22, and a rear part. It has an end portion 23. This intermediate portion 22 includes a contact portion 21 and a rear end portion 23.
The contact holding hole 11 of the insulating housing 10 is located approximately in the center of the intermediate portion 23.
A first locking portion 24 is provided in the groove 13 for locking the contact when inserted into the groove 13. The rear end portion 23 includes a first vertical portion 25 extending from the rear portion of the intermediate portion 22 and descending in a substantially perpendicular direction.
However, furthermore, a horizontal part 26 extends from the vertical part 25 and is bent at a substantially right angle, and furthermore, a second vertical part 27 extends from the horizontal part 26, bends at a right angle, and descends. A terminal portion 28 extends from the second vertical portion 27 in a horizontal direction. The horizontal part 26 has a groove for locking the rear end part 23 in the horizontal groove 16 when the horizontal part 26 is inserted into the horizontal groove 16 provided in the lower wall part 15 of the insulating housing in the front direction. 2 locking part 29
is provided. What should be noted here is that the horizontal width of the horizontal portion 26 and the second vertical portion 27 behind the second locking portion 29 is smaller than the groove width of the horizontal groove 16 and the vertical groove 17. Ori,
The horizontal portion 26 and the second vertical portion 27 are arranged in the left-right direction,
It is designed to be able to move slightly freely in the front-rear and up-down directions. The necessity of such movement will be discussed later. Furthermore, the terminal portion 28 extends rearward as a connection portion so as to come into contact with and be soldered to the signal circuit 70A (conductive pad) of the board 70. Note that in this embodiment, a large number of contacts 2
0 is arranged, and the arrangement level of every other contact part 21 is different to form a two-tier arrangement, so the height of the first vertical part 25 of adjacent contacts is Although it is different, the second locking part 2
9 and the length from the second locking portion 29 to the terminal portion 28 are all the same.

The shield case 30 is made of a metal sheet material, and has a surrounding part 31 surrounding the front end of the insulating housing 10 at the front thereof, and a collar part 32 at the rear thereof. A through hole 33 is provided on both sides of the collar portion 32 so as to come into contact with the vertical mounting portion 18A of the insulating housing 10, and for receiving the threaded portion 42 of the lock fitting 40 (see FIG. 5). . The lock fitting 40 is made of metal material,
The front part thereof is comprised of a hexagonal part 41, and the rear part thereof is comprised of a threaded part 42 having a male thread. Hexagonal part 4
1 is provided with a female threaded portion on the inside thereof for receiving a locking fitting having a male thread of a mating connector, although this is not shown. The threaded portion 42 is
As shown in FIG. 5, an L-shaped fitting 5 to be described later
It serves to securely attach the shield case 30 to the insulating housing 10 by screwing together with the female threaded portion 53 of 0.

The L-shaped fitting 50 is made of a metal material, has a substantially L-shape, and is composed of a vertical portion 51 and a horizontal portion 52. A locking fitting is located approximately in the center of the vertical portion 51. A female threaded portion 53 for receiving the threaded portion 42 of 40 is provided therethrough. Further, a through hole 5 for receiving a board mounting bracket 60, which will be described later, is also provided at approximately the center of the horizontal portion 52.
4 is provided, and furthermore, the rear end of the horizontal portion 52 is
A grounding terminal 55 is formed which is bent at a substantially right angle and descends vertically to be soldered to the grounding circuit 70B of the board 70.

The board mounting bracket 60 is made of a metal material and has a substantially cylindrical shape, the upper part of which is a flat plate flange 61, and the lower part of which is a cylindrical part 6.
It has become 2. The lower end of the cylindrical portion 62 is a caulking portion 63 that is expanded outward and caulked by a jig (not shown) when attaching to a board.

The electrical connector 1 having such a configuration is attached to the circuit board 70 in the following manner.

(1) First, as shown in FIG. 1, the electrical connector 1 is placed above the circuit board 70, and the cylindrical part 62 of the board mounting bracket 60 is inserted into the mounting hole 71 of the board 70. At this time, due to the positioning action of the cylindrical part 62 and the board mounting hole 71, the terminal part 28 of each contactor 20 and each corresponding signal circuit 70A (conductive pad) on the surface of the circuit board 70 overlap,
Further, the grounding terminal 55 of each L-shaped metal fitting 50 and each corresponding grounding circuit 70B of the board 70 overlap.

(2) Next, as shown in Fig. 5, use a jig to
Caulk the lower end of 2 to secure the connector to the board.

(3) Then, the electrical connector 1 attached to the board 70 is placed in a heater and heated. Then,
The solder applied to the circuit of the board 70 is melted by heat, and the signal circuit 70A and the terminal portion 28 of each contactor 20, as well as the ground circuit 70B and the ground terminal 55 of the L-shaped fitting 50, are melted by reflow soldering. will be attached and electrically connected.

In this way, when the signal circuit 70A and the terminal portion 28 of the contact are soldered, they are heated to melt the solder and then cooled to room temperature. , the material of the insulating housing 10, and the material of the contact are all different, and each material has a different coefficient of thermal expansion. Therefore, when cooling after heating the solder, each member is completely separated as described above. Until it cools down, the pitch of the contact holding holes 11 of the insulating housing 10 and the pitch of the signal circuit 70A of the board 70 will be different, and as a result, stress will be applied to the rear end portion 23 of each contact 20. . However, as mentioned above,
Horizontal portion 2 behind the second locking portion 29 of the rear end portion 23
6 and the second vertical portion 27 can freely move within the horizontal groove 16 and the vertical groove 17, so that the stress applied to the rear end portion 23 can be released.

FIG. 6 is a partially cutaway perspective view showing another embodiment of the present invention. In this embodiment, the contact 20 in the electrical connector 1 of the embodiment shown in FIG. 1 is replaced with a contact 20A having a different shape. is used. This contactor 20A differs from the contactor 20 in the embodiment of FIG. 1 only in the structure between the second locking part 29 and the terminal part 28. In the horizontal portion 26A, which is a part of the intermediate portion of the rear end of the contactor 20A of this embodiment, a curved portion 26 is provided close to the second locking portion 29 to facilitate free movement as described above.
A′ is provided. Such a curved portion 26
By providing A', when the terminal part 28 is soldered and fixed to the circuit conductor of the circuit board, the horizontal part 26A, which is the rear end intermediate part between the second locking part 29 and the terminal part 28, 2 vertical portions 27 are more elastically movable in left and right, front and back, and up and down directions.

FIG. 7 is a partially cutaway perspective view showing still another embodiment of the present invention, and is a view similar to FIG. 6. The contactor 20B in this embodiment has a slit 26B' formed in the horizontal part 26B instead of the curved part 26A' provided close to the second locking part 29 in the contactor 20A of FIG. . In this way, even if the slit 26B' is formed in the horizontal part 26B, the horizontal part 26B and the second vertical part 27, which are the rear end intermediate part between the second locking part 29 and the terminal part 28, are more elastic. It can be moved horizontally, vertically, and vertically.

FIG. 8 is a diagram similar to FIG. 5 showing yet another embodiment of the present invention. In the embodiment described above, the electrical connector was fixed to the circuit board 70 by caulking the caulked portion 63 of the cylindrical board mounting bracket 60, but in the embodiment shown in FIG. This is done using the board mounting fittings 60A that are included. On the other hand, a tap screw portion 54A is formed in the L-shaped metal fitting 50A. To attach this connector to the board 70, insert the convex portion 18B-2 of the insulating housing 10 into the mounting hole 71 of the board 70, insert the board mounting bracket 60A from below, and tighten the threaded part of the L-shaped bracket 50A. This is done by screw fixation by screwing into the tap threaded portion 54A of.

Effects of the Invention Since the surf S-mount electrical connector of the present invention has the above-described configuration, it can exhibit the following effects.

(1) The main parts of the rear ends of the contacts are protected by being inserted into the grooves of the insulating housing, so foreign objects do not come into contact with them from the outside, and the contacts do not come into contact with each other, and the main parts are protected. are left and right in the groove,
Since it can freely move back and forth or up and down, even if stress is applied to the rear end during cooling after reflow soldering, the stress can be released, preventing the solder from peeling off.
There is no risk of abnormalities such as contact deformation.

(2) Even if the contacts are arranged in multi-layer rows in an insulating housing, the rear ends of the contacts can be made to have the same length, so both the upper layer contact and the lower layer contact are the same. Since the stress applied to the surface is almost uniformly absorbed, the stress absorption can be balanced. Therefore, there is no risk of abnormalities such as deformation of the contact or peeling of solder due to unbalanced stress absorption in the contact in any layer. Moreover, it can be made smaller than the conventional one, and therefore can meet the demand for higher density.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a surface mount type electrical connector as an embodiment of the present invention before it is mounted on a circuit board and connected, and Fig. 2 is a rear main part of the connector shown in Fig. 1. Partially enlarged view showing 3rd
The figure is an enlarged perspective view of the main parts of the insulating housing and contacts of the connector shown in FIG. 1, partially cut away, FIG. 6 is a partially cutaway perspective view showing another embodiment of the present invention; FIG. 7 is a partially cutaway sectional view showing still another embodiment of the present invention; FIG. This figure is a sectional view similar to FIG. 5 showing yet another embodiment of the present invention, and FIG. 9 is a schematic cross-sectional view showing an example of a conventional surf S-mount electrical connector. 1... Surf S mount type electrical connector, 1
0...Insulating housing, 11...Contact holding hole,
12...Reception opening, 13...Groove, 14...Recessed portion,
15... Lower wall portion, 16... Horizontal groove, 16'... Second horizontal groove 16, 17... Vertical groove 17, 18B-1
...Through hole, 18B-2...Convex portion, 20...Contact, 21...Contact portion, 22...Intermediate portion, 23...
Rear end part, 24...first locking part, 25...first vertical part, 26...horizontal part, 27...second vertical part, 28
...Terminal part, 29...Second locking part, 30...Shield case 30, 40...Lock fitting, 50...
L-shaped metal fitting, 55... Earth terminal, 60... Board mounting bracket, 61... Flange section, 62... Cylindrical section, 63...
...Crimped part, 70...Circuit board, 70A...Circuit conductor, 70B...Earth circuit, 71...Mounting hole.

Claims (1)

[Scope of claim for utility model registration] (1) A contact part that contacts the contact part of the contact of the mating connector at one end, a connecting part that overlaps and contacts the conductor surface on the board surface at the other end, and a locking part in the middle. A surface mount type electrical connector in which a plurality of contacts having a plurality of contacts are disposed in an insulating housing such that the contact portion of each contact is arranged at at least two different levels,
The locking portion of each contact includes a first locking portion provided closer to the contact portion of the contact, and a second locking portion provided closer to the connection portion of the contact. The area from the second locking part to the connecting part of each contact constitutes the rear end intermediate part of each contact, and the length of the rear end intermediate part of each contact is substantially The insulating housing is provided with a plurality of contact arrangement holes for arranging the respective contacts, and each of the contact arrangement holes is arranged in the contact portion of each contact. and a rear intermediate portion receiving groove for receiving the rear intermediate portion of each contact, each of the contact retaining holes being arranged at the at least two different levels. However, the respective rear end intermediate portion receiving grooves are all arranged at the same level lower than the at least two different levels, and the contact portion of each of the contacts is such that the first locking portion is connected to the contact holding portion. The second locking portion of each contact is locked in the contact holding hole by engaging with the wall of the hole, and each of the rear end intermediate receiving grooves locks the second locking portion of each contact into the wall of the hole. The surf surfboard has a shape that allows free movement in the left and right, front and back, or up and down directions between the second locking part and the connecting part of the middle part of the rear end. S-mount electrical connector. (2) A curved portion is provided at the intermediate portion of the rear end of each of the contacts in the vicinity of the second locking portion to facilitate the movement. Surf S mount type electrical connector described in item 1). (3) Utility model registration claim No. 1, wherein a slit is provided in the intermediate portion of the rear end of each of the contacts, in proximity to the second locking portion, to facilitate the movement. Surf S mount type electrical connector described in ).