JP2562970Y2 - Surface mount type connector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type (SMT) electrical connector, and more particularly, to an SMT connector having a fixing or holding member to be soldered to a circuit board.

[0002]

2. Description of the Related Art An electrical connector for a circuit board (printed board) has a tine type in which pin-shaped terminals (tines) are inserted into through holes of the circuit board and flow-soldered, and an electrical connector formed on the surface of the circuit board. There are known two types of SMT connectors in which a solder cream is adhered to a pad which has been placed, a plate-like terminal is arranged on the pad, and the solder cream is heated and melted to perform reflow soldering. The former has high soldering strength between the connector and the circuit board, but is difficult to apply when the contacts have a high density of contacts. On the other hand, the latter does not require an opening such as a through hole in a circuit board, and is therefore suitable for high density. 2. Description of the Related Art SMT connectors are becoming more and more popular due to the recent trend toward smaller, lighter, and smaller electronic devices. However, when a large tension is applied to the soldered connector, the soldered connection may be broken. In view of this, a connector using a holder has been proposed and used in order to protect the soldered connection portion of the contact from tension applied during and after reflow soldering of the contact of the SMT connector.

[0003] Various holders have been proposed for this purpose. For example, as disclosed in Japanese Patent Publication No. 2-28236, a pair of substantially rod-shaped metal holders which are press-fitted and held in an insulating housing are generally used. Such a holder is usually inserted into an opening formed in the circuit board and fixed by soldering. However, it may not be desirable to form the openings in the circuit board. In that case, for example,
As disclosed in Japanese Patent No. 74473, a holding bracket or the like which is embedded in both ends of an insulating housing and has a soldering surface flush with a mounting circuit board is generally used.

[0004]

However, in such an embedded type mounting bracket, mismatch (misalignment) easily occurs between the SMT terminal of the contact and the soldering surface of the holding bracket. That is,
If the soldering surface of the holding fitting protrudes too far outward from the connector housing from the soldering face of the SMT contact, only the holding fitting is soldered, and the essential soldering of the SMT contact becomes impossible or incomplete. Cannot be demonstrated. Conversely, if the SMT contact protrudes outward, the holding fitting is not soldered and the purpose of reinforcing the connector cannot be achieved.

As described above, it is necessary to make the SMT soldering portion of each contact and the solder connecting portion of the holder substantially coplanar. However, it is practical to obtain an SMT connector having a holder which is optimally aligned with the conventional fixed type holder which is integrally embedded at the time of a molding operation or which is press-fitted and held in a connector housing in a later step, especially when the number of contacts increases. Was difficult.

Accordingly, it is an object of the present invention to provide a self-adaptive SMT connector retainer or fixture that can be easily and optimally aligned with an SMT contact.

[0007]

According to the SMT type connector of the present invention, there is provided an insulating housing having a plurality of SMT contacts arranged in at least one row. Both feet of the insulating housing are provided with fixing or holding means having fixing parts which are connected by soldering to the surface of the mounting circuit board.
Each fixture has a long hole, and movably engages with protrusions at both ends of the insulating housing in a vertical direction, or is bent into a substantially U-shape inserted from above into an opening near the end of the insulating housing. Holding legs. With such an arrangement, the fixture is movable within a limited range perpendicular to the insulating housing. As a result, when the SMT type connector is mounted on the circuit board, the fixing portion of the fixing tool comes into contact with the surface of the circuit board first, but when further pressed, the fixing tool slides, and the SMT contact uniformly contacts the surface of the circuit board. I do. In this state, reflow soldering is performed. This soldered SMT
When tension is applied to the mold connector, the fixture engages and holds the insulating housing, so that the SMT contact can be used with the SM to prevent excessive tension or distortion.
Reinforce the T-type connector.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the SMT type connector according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1A and 1B show the SM of the present invention, respectively.
1 shows a bottom view of a preferred embodiment of a T-connector 10 and a cross-sectional view along line BB. The SMT connector 10 includes an insulating housing 20, a plurality of SMT contacts 30, and a pair of fixtures 40. The bottom surface of the insulating housing 20 is substantially rectangular and has a pair of positioning posts 21 inserted into openings or recesses in a mounting circuit board (not shown). Furthermore,
The insulating housing 20 has a concave portion 22 in the center of the bottom surface, grooves 24 are formed in both side walls 23 on the bottom surface, and the SMT soldered portion 34 of the contact 30 is inserted and held. Also,
Both ends of the insulating housing 20 have slots 25 for inserting the fixture 40. The upper surface of the insulating housing 20 has a raised portion 26 as shown in FIG. 1 (B), and has a holding groove on both surfaces thereof into which the contact portion 33 of the contact 30 is inserted and held. The contact portions 33 of the contacts 30 protrude outward from both side surfaces of the raised portion 26 to form a plug-type connector.

FIGS. 2A, 2B, and 2C respectively show FIGS.
FIG. 3A shows an end view and a cross-sectional view taken along line bb and line cc. FIG. 2A shows the positional relationship between the slots 25 at both ends of the insulating housing 20 of the SMT connector 10 and the fixtures 40 inserted and held in the slots. FIG. 2 (B)
Shows details of the contacts 30 arranged in two rows in the insulating housing 20. As can be seen from the figure, each contact 30 has a central fixed portion 31, a free end constitutes a contact portion 33, a U-shaped portion 32, a zigzag-shaped strain absorbing portion 35, and an SM.
It has a T soldering part 34. FIG. 4C shows the fixing tool 4 inserted and held in the slot 25 of the insulating housing 20.
Indicates 0. The slot 25 is wider at the bottom than at the top and forms a shoulder 27 in the middle. A projection 28 is provided at the center.

FIG. 3 shows an example of the fixture 40. As shown in the figure, the fixing device 40 is a substantially L-shaped metal fitting, and has a substantially square solder connecting portion 41 and a holding portion 43 having a slot (longitudinal groove) 42 at the center. The holding portion 43 is substantially U-shaped, and has barbs (barbs) 44 on the outside of both legs. The fixture 40 is preferably a slot 25 in the insulating housing 20.
Is pushed downward from above. As shown in FIG.
It should be noted that gaps are provided between the barbs 44 and the shoulders 27 and between the slots 42 and the projections 28, respectively, so that the fixture 40 can be moved (i.e., freely) to some extent in the vertical direction. Thereby, as described above, the SMT contact 3
The soldering portion 34 of the No. 0 and the solder connecting portion 41 of the fixture 40 can be easily aligned.

The barb 44 of the fixture 40 engages the shoulder 27 of the slot 25 to prevent removal once the retainer 43 is pressed into the slot 25. In addition, the SMT connector 10
When tension is applied in a direction in which the insulating housing 20 is pulled away from the circuit board, the protrusion 28 of the insulating housing 20 is engaged with the upper portion of the central slot 42 of the holding portion 43. As a result, the insulating housing 20 is further separated from the circuit board, and S
This effectively prevents the solder connection of the soldered portion 34 of the MT contact 30 from being damaged. That is, the mounting strength of the SMT connector 10 to the circuit board is reinforced.

Next, another embodiment of the SMT type connector of the present invention will be described with reference to FIGS. 4 (A) and 4 (B). FIG.
FIG. 4A is a cross-sectional view similar to FIG.
Is an enlarged perspective view of the fixture 40 '. For convenience of explanation, elements corresponding to those of the SMT connector 10 of the first embodiment are denoted by similar reference numerals.

SMT connector 1 according to another embodiment
The 0 'insulating housing 20' has a closed slot or opening 25 'near its longitudinal ends. The fixing device 40 'has a solder connection portion 41' and a holding portion 43 ', similarly to the fixing device 40. Although the solder connection portions 41 'and 41 are substantially the same, the holding portion 43' is bent at the upper end into a substantially U-shape, has a slit 46 at its free end, and has barbs 44 'on both sides. . This holding part 43 'is the slot 2 of the insulating housing 20'
When inserted into 5 ', barb 44' engages the shoulder of slot 25 'to reinforce between insulating housing 20' and the mounting circuit board.

As is clear from FIG. 4A, the fixture 40 '
There is a gap between the U-shaped portion of the holding portion 43 'and the upper surface of the insulating housing 20'.

First, the fixture 40 'is pushed downward so that the gap does not substantially exist. In this state, S
When the MT connector 10 'is mounted on a circuit board (not shown), first, the guide posts 21' are engaged and guided in the guide holes of the circuit board. When further depressed, the solder connection portion 41 'of the fixture 40' comes into contact with the solder pad of the circuit board. When further depressed, the fixture 40 'slides slightly upward to form the above-described gap, and the soldered portion 34' of each SMT contact 30 '.
Abuts against the corresponding contact pad on the circuit board and stops. In this state, the solder adhered to each pad is reflowed by known means such as infrared irradiation, and the soldering operation is completed.

Note that each contact 30 ', 30' has a zigzag-shaped strain absorbing portion 35 in addition to the SMT-type connectors of both embodiments described above. When tension is applied to the insulating housings 20, 20 'when the SMT connectors 10, 10' are mated with or pulled out from the mating connectors, the SMT soldered portions 34, 34 'of the contacts 30, 30' are formed.
Before excessive tension is applied to the fasteners, the retaining portions 43, 43 'of the fixtures 40, 40'
The engagement of the projections 28 or barbs 44 'on the inner wall 5 with the shoulders on the inner wall of the slot 25' effectively protects the soldered portions 34, 34 'from excessive tension on the insulating housing 20, 20'.

Although the SMT type connector of the present invention has been described based on the preferred embodiment, the present invention should not be limited to only such an embodiment, and various modifications can be made without departing from the gist thereof. You can see that For example,
The contact can have various shapes depending on the application. The present invention is applicable not only to a plug type connector but also to a receptacle type connector.

[0019]

As will be understood from the above description, the surface mount type connector of the present invention has a structure in which the fixing tool can be moved up and down within a predetermined range, and between the soldered portion of the SMT contact and the fixed portion. A strain absorbing part is formed. Therefore, when soldering by surface mounting, the SMT soldering portion of the contact is lifted from the solder connecting portion of the fixture, and there is no risk of incomplete soldering. The contact soldered by the fixture can be reliably protected against the applied excessive tension, and is very suitable for a small and high-density surface-mount connector having a pitch of 0.5 mm or the like.

[Brief description of the drawings]

FIG. 1 is a bottom view and a sectional view of an embodiment of an SMT type connector according to the present invention.

FIG. 2 is a line end view of FIG. 1 (A) and lines bb and cc;
FIG.

FIG. 3 is a front view of the fixture shown in FIG. 1;

FIG. 4 is a cross-sectional view of another embodiment of the SMT type connector of the present invention and an enlarged perspective view of a fixture thereof.

[Explanation of symbols]

 10, 10 'SMT type connector 20, 20' Insulated housing 25, 25 'Slot 27 Shoulder 30, 30' Contact 31 Fixed part 33 Connection part 34, 34 'Solder part 35 Strain absorbing part 40, 40' Fixture 41, 41 'solder connection part 43, 43' holding part 44, 44 'barb

Continuation of front page (56) References JP-A-63-158765 (JP, A) JP-A 64-55674 (JP, U) JP-A-4-99366 (JP, U) JP-A-4-106881 (JP , U) Japanese Utility Model 4-133384 (JP, U) Japanese Utility Model 63-6977 (JP, U) Japanese Utility Model 1-70273 (JP, U) Japanese Utility Model 3-74473 (JP, U) 2-28236 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A surface mount type connector having a plurality of surface mount contacts arranged along a longitudinal direction of an elongated insulative housing and having a pair of fixing members near both ends of the insulative housing, wherein each of the contacts is the green color. A fixing portion fixed to the fixing portion separated from the bottom surface of the housing, the solder portion substantially matching the bottom surface via a strain absorbing portion, and a contact portion extending upward from the fixing portion; And a solder connection portion substantially parallel to the bottom surface of the insulating housing, wherein the fixture has a barb that abuts a shoulder formed in the slot, and A surface mount type connector characterized in that it is movable vertically.