JPH0523429U - Surface mount type connector - Google Patents

Abstract

(57) [Summary] [Objective] To provide an SMT type connector with a reinforcing fixture suitable for a small and high density SMT type connector. [Structure] Slots 25 are formed at both ends of an insulating housing 20 of an SMT type connector 10, and holding portions 43 of a fixture 40 having a soldering portion 41 are inserted therein. Retainer 43 is slot 25
The contacts 30 and the soldered portions 34 and 41 of the fixture 40 are correctly aligned so that they can be moved within a limited range within the strain absorption limit of each contact 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surface mount type (SMT) electrical connector, and more particularly to an SMT connector with a fixing member or a fixing member for soldering and fixing to a circuit board.

[0002]

[Prior Art]

 The electrical connectors for circuit boards (printed circuit boards) are tine type in which pin-shaped terminals (tines) are inserted into the through holes of the circuit board for flow soldering, and solder cream is applied to the pads adhered to the surface of the circuit board It is known that two types of SMT connectors are prepared, in which a plate-shaped terminal is placed on this, and the solder cream is heated and melted and reflow soldered. The former has a high soldering strength between the connector and the circuit board, but is difficult to apply when the contacts are densely arranged. On the other hand, the latter is suitable for high density because it does not require openings such as through holes in the circuit board. SMT connectors are becoming more and more popular due to the recent tendency of electronic devices to become lighter, thinner and smaller. However, if a large tension is applied to the soldered connector, the soldered connection may be destroyed. Therefore, a connector using a holder has been proposed and used in order to protect the soldered connection part of the contact from the tension applied during and after the reflow soldering of the contact of the SMT connector.

Various types of holders have been conventionally proposed for this purpose. For example, as disclosed in JP-B-2-28236, a pair of substantially rod-shaped metal holders that 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, in some cases it may not be desirable to form openings in the circuit board. In that case, for example, as shown in Japanese Utility Model Laid-Open No. 3-74473, it is common to use a holding metal fitting embedded in both ends of the insulating housing and having a soldering surface flush with the mounting circuit board. Target.

[0004]

[Problems of the prior art] However, in such an embedded type retainer, misalignment is likely to occur between the SMT terminal of the contact and the soldering surface of the retainer. In other words, if the soldering surface of the retaining bracket projects too far outward from the connector housing than the soldering surface of the SMT contact, only the retaining bracket will be soldered, and the essential SMT contact soldering will be impossible or incomplete. , Cannot perform a predetermined function. On the contrary, if the SMT contact protrudes outward, the holding metal fitting is not soldered and the purpose of reinforcing the connector cannot be achieved.

As described above, it is necessary to configure the SMT soldering portion of each contact and the soldering portion of the holder to be substantially flush with each other. However, it is possible to obtain an SMT connector having an optimally aligned retainer with an increased number of contacts, especially in the conventional fixed type retainer that is integrally embedded during the molding work or press-fitted and retained in the connector housing in the subsequent process. Was practically impossible.

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

[0007]

[Means for solving the problem]

 According to the SMT type connector of the present invention, the SMT type connector includes an insulating housing having a plurality of SMT contacts arranged in at least one row. The legs of this insulating housing are provided with a fixing or holding tool having fixing portions to be soldered to the surface of the mounting circuit board. Each fixture has a long hole and engages with protrusions at both ends of the insulating housing so as to be vertically movable, or is bent into a substantially U shape inserted from above into an opening near the end of the insulating housing. Has a holding leg section. With such an arrangement, the fixture is movable in a limited range in the vertical direction with respect to the insulating housing. As a result, when the SMT type connector is attached to the circuit board, the soldered fixing part of the fixture first comes into contact with the surface of the circuit board. To contact. Reflow soldering is performed in this state. When tension acts on the SMT type connector connected by soldering, the fixture engages with and holds the insulating housing, so that the SMT contact is prevented from being excessively tensioned or distorted. Reinforce the mold connector.

[0008]

【Example】

 Hereinafter, preferred embodiments of the SMT type connector of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are a bottom view and a sectional view taken along line BB of a preferred embodiment of the SMT type connector 10 of the present invention, respectively. The SMT connector 10 comprises 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 generally rectangular and has a pair of locating posts 21 that are inserted into openings or recesses in a mounting circuit board (not shown). Further, the insulating housing 20 has a recess 22 in the center of the bottom surface thereof, grooves 24 are formed in both side walls 23 of the bottom surface, and the SMT soldering portion 34 of the contact 30 is inserted and held. Further, both ends of the insulating housing 20 have slots 25 for inserting the fixture 30. As shown in FIG. 1 (B), the upper surface of the insulating housing 20 has a raised portion 26, and both sides thereof have holding grooves into which the contact portions 33 of the contacts 30 are inserted and held. The contact portion 33 of the contact 30 projects outward from both side surfaces of the raised portion 26 to form a plug-type connector.

2 (A), (B) and (C) show an end view of FIG. 1 (A) and a cross-sectional view taken along line bb and line cc, respectively. 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 30 inserted and held in these slots. FIG. 2B shows the details of the contacts 30 arranged in two rows in the insulating housing 20. As is clear from the figure, each contact 30 has a central fixed portion 31, a U-shaped portion 32 whose free end constitutes a contact portion 33, a zigzag strain absorbing portion 35, and an SMT solder connection portion 34. Further, FIG. 3C shows a fixture 40 inserted and held in the slot 25 of the insulating housing 20. The slot 25 is wider at the bottom than at the top and forms a shoulder 27 in the middle. The central portion has a protrusion 28.

FIG. 3 shows an example of the fixture 40. As shown in the figure, the fixture 40 is a substantially L-shaped metal fitting, and has a substantially square solder connection portion 41 and a holding portion 43 having a slot (vertical groove) 42 in the center. The substantially holding portion 43 is substantially U-shaped, and has barbs (barbs) 44 on the outer sides of both leg portions. The fixture 40 is preferably pushed into the slot 25 of the insulating housing 20 from above to below. As shown in FIG. 2 (C), attention is paid to the fact that a gap is provided between the barb 44 and the shoulder 27, and between the slot 42 and the protrusion 28, and the fixture 30 is configured to be vertically movable to some extent. I want to. As a result, as described above, the soldering portion 34 of the SMT contact 30 and the soldering portion 41 of the fixture 30 can be easily aligned.

The barbs 44 of the fixture 30 engage the shoulders 27 when tension is applied to raise the connector housing 20 upwards, thus preventing forces tending to pull the SMT connector 10 away from the mounting circuit board. This reinforces the mounting strength of the SMT connector 10.

Next, another embodiment of the SMT type connector of the present invention will be described with reference to FIGS. 4 (A) and 4 (B). 4 (A) is a sectional view similar to FIG. 1 (B), and FIG. 4 (B) is an enlarged perspective view of the fixture 40 '. For convenience of explanation, elements corresponding to the SMT type connector 10 of the first embodiment are designated by similar reference numerals.

The insulating housing 20 ′ of the SMT type connector 10 ′ according to another embodiment has closed slots or openings 25 ′ near both longitudinal ends thereof. The fixture 40 ′ has a solder connection portion 41 ′ and a holding portion 43 ′ like the fixture 40. The solder connection portions 41 ', 41' are substantially the same, but the holding portion 43 'is bent at the upper end into a substantially U shape, and a slit 46 is formed at its free end and barbs 44' on both sides. Have. When this retaining part 43 'is inserted into the slot 25' of the insulating housing 20 ', the barb 44' engages with the shoulder of the slot 25 'to reinforce between the insulating housing 20' and the mounting circuit board.

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

First, the fixture 40 ′ is pushed downward so that the gap is substantially absent. When the SMT type connector 10 'is attached to a circuit board (not shown) in this state, the guide post 21' is first engaged and guided in the guide hole of the circuit board. When it is further pushed down, the soldering portion 41 'of the fixture 40' comes into contact with the soldering pad of the circuit board. When pushed further down, the fixing tool 40 'slides a little upward, forming the above-mentioned gap, and the soldering part 34' of each SMT contact 30 'comes into contact with the corresponding contact pad on the circuit board and stops. To do. In this state, the solder deposited on each pad is reflowed by a known means such as infrared irradiation, and the soldering work is completed.

It should be noted that both the SMT type connectors of the above-described embodiments have the zigzag-shaped strain absorbing portion 35 in each contact 30 ', 30'. When tension is applied to the insulating housings 20 and 20 'when the SMT type connectors 10 and 10' are mated with or removed from the mating connectors, excessive SMT solder connection parts 34 and 34 'of the contacts 30 and 30' will be applied. Before tension is applied, the barbs 44, 44 'of the retainers of the fixtures 40, 40' abut shoulders 27, 27 'on the inner walls of the slots 25, 25' to protect the solder connections 34, 34 '.

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

[0019]

[Effect of the device]

 According to the SMT type connector of the present invention, it is possible to add a reinforcing fixture which does not require precise positioning with respect to the SMT soldering part of the contact. The SMT type connector having the contacts mounted therein can be manufactured easily and inexpensively, which has a remarkable practical effect.

[Brief description of 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. 1A and lines bb and cc.
FIG.

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

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 30, 30' Contact 40, 40 'Fixing tool 41, 41' Solder connection part

Claims (1)

[Scope of utility model registration request] 1. A soldered connection part which is mounted in slots at both ends of an insulating housing holding a plurality of surface mount contacts arranged in at least one row and is movable within a certain range in a direction perpendicular to a mounting circuit surface. A surface mount type connector having an attached fixture.