JP2014165091A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a connector which is a down-sized surface-mounted connector and has sufficient fixing strength on a printed board.SOLUTION: A connector comprises a reinforcing metal fitting which is attached both ends of a housing to hold a terminal in a longer direction and soldered on a board so that the connector can ensure fixing strength. The reinforcing metal fitting includes: a flat plate part; an engagement part forming a U-shaped cross-sectional shape together with the flat plate part; and a pair of second engagement parts bent at both ends of the flat plate part. Both of the flat plate part and the engagement part hold the end part of the housing in between so as to fit the reinforcing metal fitting onto the housing integrally. A right-angle type is soldered at an L-shaped edge face which is formed by an edge of the flat plate part and the engagement part bent. A streight type is soldered at a vertical long U-shaped edge face which is formed by edges of the flat plate part and the pair of second engagement parts. Consequently, displacement due to vibration of another connector can be prevented.

Description

  The present invention relates to a surface mount type connector attached to a printed circuit board.

  2. Description of the Related Art Conventionally, there is a connector that is fixed to a printed circuit board in order to connect the printed circuit board and other electrical components with a flat cable or connect the printed circuit boards. As such a connector, a plurality of mails (male) arranged in parallel in the longitudinal direction of the housing by a box-shaped insulating housing elongated in a direction along the substrate surface of the printed circuit board and a plurality of guide grooves formed in the housing It has a terminal and a pair of reinforcing metal fittings attached to both ends in the longitudinal direction of the housing. Each mail terminal is soldered to the fixing pattern of the printed circuit board, and the reinforcing metal fitting is also soldered to the corresponding part of the fixing pattern. In some cases, the connector is firmly attached to the printed circuit board (see, for example, Patent Document 1).

JP 2000-268905 A

  The connector disclosed in Patent Document 1 can share a straight type in which the mail terminal is erected on the substrate surface and a right angle type in which the mail terminal is in a state along the substrate surface. Solder surfaces that can correspond to each type are provided on the edges of the two sides. Further, in the connector of Patent Document 1, the reinforcing bracket is formed by punching, for example, in a U-shape when viewed from the front and back of the plate-like piece, and the U-shaped upper side portion of the reinforcing bracket is inserted into both side walls at both ends in the longitudinal direction of the housing. A vertically long engagement hole and an engagement groove into which the lower side portion is inserted are provided, and the upper and lower sides are inserted into the engagement hole and the engagement groove, and the reinforcing metal fitting is attached to the housing.

  However, in recent years, surface mount connectors with a narrow pitch have been miniaturized in order to cope with the higher density of wiring patterns on printed circuit boards. When the reinforcing bracket to be attached to such a small connector is formed by a plate-shaped piece, it can be reduced in size by forming it with a thin plate material, but the soldering surface by the edge of each side is narrowed, and the fixing force is reduced. There was a problem of lowering. Moreover, the problem that intensity | strength falls also occurs because of a thin plate-shaped piece.

  In order to solve such a problem and realize a connector capable of securing a sufficient fixing force of a miniaturized surface mount connector to a printed circuit board, in the present invention, a terminal and the terminal are held. And a reinforcing bracket that is attached to an end of the housing and soldered to a printed circuit board, wherein the reinforcing bracket is formed by bending a plate material. A flat plate portion extending along the end surface, and an engagement piece provided to face the flat plate portion and to form a U-shaped cross-sectional shape together with the flat plate portion, and the housing is parallel to the end surface The reinforcing bracket is attached to the housing in a state where a portion between the concave portion and the end surface of the housing is sandwiched between the engagement piece and the flat plate portion. It was assumed to have been.

  According to this, by soldering the reinforcing metal fitting attached to the end of the surface mount connector to the printed circuit board, it is possible to prevent a load from being applied to the portion of the terminal soldered to the printed circuit board. The mounting state is secured well, and the reinforcing bracket is formed in a U-shaped cross section by the flat plate portion and the engagement piece, and the wall between the recess and the end surface of the housing is held between the engagement piece and the flat plate portion. By doing so, the reinforcing bracket is attached to the housing, so that a firm attachment state can be ensured with respect to what is attached by simply inserting the flat reinforcing bracket into the housing. As a result, even if the reinforcing metal fitting is thin and downsized, the mounting strength to the housing can be ensured, so that the connector can be downsized.

  In particular, the engagement piece may have a claw protruding so as to engage with the inner surface of the recess. According to this, the claw provided on the engagement piece can be engaged with the inner surface of the recess when the fitting direction when the other connector is connected or the force of the removal direction when separating is applied to the housing. Therefore, the load when the other connector is fitted or removed can be received by the reinforcing metal fitting, and it is possible to suppress the peeling of the solder due to the external force acting on the soldered portion of the terminal to the substrate.

  The reinforcing metal fitting may have an L-shaped end surface for soldering to the printed board in an L-shape. According to this, since the shape of the soldering portion of the reinforcing bracket to the printed circuit board is formed in an L shape, the soldering portion of the reinforcing bracket can cope with the falling in each orthogonal direction, Peel strength can be improved.

  Further, the flat plate portion may have an edge portion along the substrate, and the L-shaped end surface may be provided on at least one end side of the edge portion of the reinforcing metal fitting. For example, when an external force oblique to the insertion / removal direction is applied to the connector when another connector is inserted into or removed from the connector, one end side of the edge portion along the board of the flat plate portion is displaced in a direction away from the board with the other end as a fulcrum. However, by providing an L-shaped end surface on one end where the displacement is increased and soldering, separation of the edge from the substrate on one end side can be prevented.

  As described above, according to the present invention, it is possible to prevent a load from being applied to a portion of the terminal soldered to the printed board by soldering the reinforcing metal fitting attached to the end of the surface mount connector to the printed board. Therefore, the terminal is soldered well, and the reinforcing bracket is formed in a U-shaped cross section by the flat plate portion and the engagement piece, and the wall between the recess and the end surface of the housing is formed between the engagement piece and the flat plate. Since the reinforcing metal fitting is attached to the housing by being sandwiched by the portion, it is possible to secure a firm attachment state with respect to what is attached by simply inserting the flat reinforcing metal fitting into the housing. As a result, even if the reinforcing metal fitting is thin and downsized, the mounting strength to the housing can be ensured, so that the connector can be downsized.

It is a perspective view which shows the use condition of the mail connector to which this invention was applied. It is an assembly exploded perspective view of a connector in the case of using as a right angle type. FIG. 3A is a perspective view showing a terminal used in a right angle type, and FIG. 3B is a perspective view showing a terminal used in a straight type. (A) is a principal part expansion perspective view which shows the state which assembled | attached the terminal to the housing 4, (b) is a principal part expanded sectional view seen from the arrow IVb direction of (a). It is a figure which shows the penetration state to the holding hole of a terminal, (a) is the principal part expanded sectional view seen in the arrow direction of the broken line Va-Va of FIG. 4, (b) is the broken line of (a). It is the principal part expanded sectional view seen in the arrow direction of Vb-Vb. It is a principal part expanded sectional view seen in the arrow direction of the broken line VI-VI of FIG. 4 explaining the holding structure by the housing of the leg part of a terminal. (A) is the principal part expanded plane sectional view seen in the arrow direction of the broken line VIIa-VIIa of FIG. 1, (b) is the figure seen in the arrow direction of the broken line VIIb-VIIb of (a). is there. It is explanatory drawing which shows the fixation procedure to the board | substrate of a reinforcement metal fitting, (a) is a case where the connector 2 is used with a right angle type, (b) is a principal part perspective view when the connector 2 is used with a straight type.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a use state of a mail connector to which the present invention is applied. As shown in the figure, two connectors 2 are mounted on a substrate surface 1 a of the printed circuit board 1. A connector (female) connector 31 is connected to the connector 2 as shown by an arrow A in the figure. Both connectors 2 have the same structure, and by changing the mounting form on the printed circuit board 1, the connector 2 on the left side of the figure has a protruding direction of the connecting portion (contact portion 7c) of the terminal 3 with the receptacle connector 31. As a straight type that stands upright on the substrate surface 1a of the substrate 1, the connector 2 on the right side of the figure is in a state in which the protruding direction of the connection portion (contact portion 7c) of the terminal 3 with the receptacle connector 31 is along the substrate surface 1a. Each is provided as a right angle type.

  FIG. 2 is an exploded perspective view of the connector 2 when used as a right angle type. As shown in the figure, the connector 2 includes a horizontally long synthetic resin housing 4 along the board surface 1 a in a mounted state on the printed board 1, a plurality of conductive terminals 3 assembled to the housing 4, and the length of the housing 4. It is comprised with a pair of reinforcement metal fitting 5 attached to each direction both ends.

  FIG. 3A is a perspective view showing the terminal 3 in a state used for the right angle type, and FIG. 3B is a perspective view showing the terminal 3 in a state used for the straight type. As shown in the figure, the terminal 3 has a pin shape with a rectangular cross-sectional shape bent in an L shape as a whole, and has a leg portion 6 corresponding to one side of the L shape and the other side of the L shape. And a protrusion 7 that protrudes from one end of the leg 6.

  The leg portion 6 has a substantially rectangular parallelepiped block soldering portion 8 at an end opposite to the protruding portion 7 side, and a columnar holding portion 9 extending from the soldering portion 8 to a bent portion of the protruding portion 7. Have. In order to solder to the wiring pattern 20 of the printed circuit board 1, the soldering portion 8 has a right angle soldering surface 8a formed of a flat surface facing the longitudinal direction of the leg portion 6 and a right angle soldering surface 8a. And a straight soldering surface 8b facing the side opposite to the protruding portion 7 is provided.

  The projecting portion 7 is formed so as to project orthogonally from the end portion of the leg portion 6 on the holding portion 9 side, and is formed so that the thickness gradually decreases from the holding portion 9 side to the base portion 7a and the base portion 7a. The tapered portion 7b and the contact portion 7c thinner than the base portion 7a are provided in this order. The base portion 7a, the taper portion 7b, and the contact portion 7c are formed in a square cross section that is similar to each other. In addition, although the cross-sectional shape of the protrusion part 7 was made into the square in the example of illustration, it is not restricted to a square cross section, The thing of various shapes, such as a polygon including a rectangle, and a circle, may be sufficient.

  FIG. 4A is an enlarged perspective view of a main part showing a state in which the terminal 3 is assembled to the housing 4. As shown in FIG. 1, the housing 4 extends in a direction along the substrate surface 1 a from the wall portion 11 which is standing on the substrate 1 when used as a right angle type. The top plate portion 12 and the bottom plate portion 13 and the side wall portions 14 at both ends in the longitudinal direction of the housing 4 are formed. The wall portion 11 is provided with a groove-like holding groove 15 for receiving the leg portion 6 of the terminal 3 in a standing state with respect to the substrate 1, and the protruding portion 7 of the terminal 3 is provided on the top plate portion 12 and the bottom plate portion 13. A holding hole 16 is provided so as to communicate with the holding groove 15 and to form an L shape together with the holding groove 15 so as to protrude into the space therebetween.

  FIG. 4B is an enlarged cross-sectional view of the main part viewed from the direction of arrow IVb in FIG. 4A showing the soldered state of the terminal 3 to the substrate 1. As shown in the figure, when the terminal 3 is assembled to the housing 4, the right angle type soldering surface 8 a is from the bottom surface 4 a of the housing 4, and the straight soldering surface 8 b is from the wall surface 4 b of the housing 4. The fixed amount a protrudes. Thereby, when soldering each soldering surface 8a * 8b to the board | substrate 1, since the clearance gap arises between the board | substrate surface 1a and the outer surface (4a * 4b) of the housing 4, the flow of the solder by reflow is smooth. Thus, good soldering can be performed.

  FIG. 5 is a view showing a state in which the terminal 3 is inserted into the holding hole 16, and FIG. 5A is an enlarged cross-sectional view of the main part viewed in the direction of the arrow of the fracture line Va-Va in FIG. ) Is an enlarged cross-sectional view of the main part viewed in the direction of the arrow of the fracture line Vb-Vb of (a). The base 7a of the protrusion 7 is inserted into the holding hole 16 and is held in a press-fitted state. In the illustrated example, each cross-sectional shape of the protruding portion 7 and the holding hole 16 is a square. In this case, as shown in FIG. 5, the length of one side of the contact portion 7c of the protruding portion 7 is set to b1. And the length of one side of the holding hole 16 is b2, and the length of one side of the base portion 7a of the projecting portion 7 is b3, each is formed so as to have a relationship of b1 <b2 <b3. The cross-sectional shape of the holding hole 16 is not limited to the square in the illustrated example, and a similar shape in which the base portion 7a of the projecting portion 7 is in a press-fit state is preferable. If the base portion 7a has a rectangular cross-sectional shape, the similar shape is obtained. It may be a rectangular cross-sectional shape.

  Due to the above relationship, when the protruding portion 7 of the terminal 3 is inserted into the holding hole 16 as shown by the arrow B in FIG. 2, the contact portion 7c is easily inserted because it is thinner than the holding hole 16, but the base portion 7a. Since it is thicker than the holding hole 16, it is press-fitted into the holding hole 16. Since the tapered portion 7b is provided between the base portion 7a and the contact portion 7c, the holding hole 16 can be gradually expanded in the process of inserting the tapered portion 7b into the holding hole 16, and the terminal 3 ( The insertion operation of the protruding portion 7) can be easily performed.

  Thus, the leg portion 6 and the contact portion 7c are separated from each other by the wall portion 11, and the base portion 7a is held in the press-fitted state on the four surfaces by the holding holes 16 provided in the wall portion 11. Thereby, it is possible to block by the holding hole 16 that the flux is transmitted to the contact portion 7c in the soldering of the soldering portion 8 described later of the leg portion 6. In addition, in the protrusion direction of the protrusion part 7, the length D of the holding hole 16 is made longer than the base part 7a, and it does not press into the holding hole 16 in the middle of the taper part 7b. As a result, when the terminal 3 is plated, there is a possibility that debris may be generated due to press-fitting into the holding hole 16, but a step ( b3-b1) occurs, and the step forms a wall that stops the plating residue.

  FIG. 6 is an enlarged cross-sectional view of the main part viewed in the direction of the arrow line VI-VI in FIG. 4 for explaining the holding structure of the leg part 6 of the terminal 3 by the housing 4 (wall part 11). On both side surfaces of the holding portion 9 of the leg portion 6, shoulder portions 9b made of vertical wall surfaces of grooves 9a having a substantially wedge-shaped cross section formed by pressing are provided. The holding groove 15 provided in the wall portion 11 of the housing 4 is provided with a convex engaging portion 15 a protruding so as to approach both inner wall surfaces corresponding to both side surfaces of the holding portion 9.

  Assuming that the width between the bottom surfaces of the pair of grooves 9a forming the shoulder portions 9b is b4, the width of the convex engaging portion 15a is b5, and the width of the holding portion 9 is b6, the relationship is b4 <b5 <b6. Has been. As a result, the leg 6 enters the holding groove 15 as the protrusion 7 is inserted into the holding hole 16. For example, the rear surface 6 a of the leg 6 opposite to the protrusion 7 side and the housing 4 In a state in which the terminal 3 is pushed in until the wall surface 4b is flush with the wall surface 4b (see FIG. 5), a part of the convex engaging portion 15a bites into the groove 9a, and the protruding portion 7 is not pulled out. Thus, the shoulder portion 9b and the convex engagement portion 15a are engaged with each other, so that the terminal 3 is prevented from coming off. In the illustrated example, the groove 9a is formed to provide the shoulder 9b. However, the opposite side of the shoulder 9b is opened so that the bottom surface of the groove 9a reaches the end surface of the leg 6 opposite to the protruding portion 7. It is good also as the concave shape made.

  Next, the attachment state to the housing 4 of the reinforcement metal fitting 5 is demonstrated. As shown in FIG. 2, the reinforcing metal fitting 5 is formed by bending a thin plate material, and is a rectangular flat plate portion 5 a and an L-shaped bent portion bent in an L shape at one longitudinal end portion of the flat plate portion 5 a. The portion 5b is extended from the L-shaped bent portion 5b so as to form a U-shaped cross-sectional shape together with the flat plate portion 5a and the L-shaped bent portion 5b, and is bent and extends substantially parallel to the flat plate portion 5a. And a pair of second engaging pieces 5d that are obliquely bent so as to approach each other at both side edges along the longitudinal direction of the flat plate portion 5a on the other longitudinal end side of the flat plate portion 5a. Yes. The engaging piece 5c is formed with two sawtooth-shaped claws 5e protruding in opposite directions from both side edges along the extending direction. The claw 5e has a slope in the extending direction of the engagement piece 5c, and is provided so as to have a right-angled corner on the opposite side. The L-shaped bent portion 5b extends over the entire length of the edge on the one end in the longitudinal direction of the flat plate portion 5a, but a hole for facilitating bending is provided in the intermediate portion in the extending direction. It is provided in a shape that makes a pair in appearance.

  FIG. 7A is an enlarged plan sectional view of the main part viewed in the arrow direction of the fracture line VIIa-VIIa in FIG. 1, and FIG. 7B is viewed in the arrow direction of the fracture line VIIb-VIIb in FIG. FIG. At the end in the longitudinal direction of the housing 4, a recess 17 is provided so as to open parallel to the end surface 4 c facing in the longitudinal direction and open to the side opposite to the wall surface 4 b, and an end surface as shown in FIG. 2. A pair of engaging grooves 18 having a wedge-shaped cross section formed at the upper and lower edges in FIG. 2 of 4c are provided. In addition, although the recessed part 17 has the shape where the wall surface 4b side was closed in the example of illustration, the through-hole shape opened to the wall surface 4b may be sufficient.

  The reinforcing metal fitting 5 is assembled to the housing 4 by aligning the pair of second engaging pieces 5d with the pair of engaging grooves 18 and inserting the engaging pieces 5c into the recesses 17 as shown by the arrow B in FIG. . The reinforcing metal fitting 5 is pushed in until the L-shaped bent portion 5b comes into contact with the end surface of the end wall portion 4d as a portion between the concave portion 17 and the end surface 4c. By setting the distance between the flat plate portion 5a and the tip of the engagement piece 5c to be narrower than the wall thickness of the end wall portion 4d (b7 in FIG. 7A), the flat plate portion is obtained by the elastic restoring force of the reinforcing bracket 5. The end wall portion 4 d can be sandwiched between the engaging piece 5 c and the reinforcing piece 5 c, and the reinforcing metal fitting 5 can be integrally attached to the housing 4. Further, the elastic restoring force of the reinforcing metal fitting 5 increases the surface pressure against the end face 4c of the flat plate portion 5a, and the retaining force of the reinforcing metal fitting 5 increases. It should be noted that the end wall portion 4d need only be sandwiched between the flat plate portion 5a and the engagement piece 5c, and is not necessarily sandwiched by the elastic restoring force.

  Further, as shown in FIG. 7B, the width between the claws 5e provided on both sides (the vertical direction in FIG. 2) of the engagement piece 5c is b8, and the width of the recess 17 in the corresponding direction is b9. Then, the relationship is set so that b8 <b9. Further, since the shape of the claw 5e is a sawtooth shape having a slope inclined backward with respect to the insertion direction of the engagement piece 5c into the recess 17 and a corner perpendicular to the pulling direction as described above, The claw 5e bites into the wall surface of the recess 17, and the engagement piece 5c is firmly prevented from coming off.

  FIG. 8 is an explanatory view showing a procedure for fixing the reinforcing metal fitting 5 to the substrate 1. Although only the reinforcing metal fitting 5 is shown in the figure, it is fixed to the substrate 1 while being attached to the housing 4 as shown in FIG. A fixing pattern 19 for soldering the reinforcing metal fitting 5 is formed on the substrate surface 1a.

  FIG. 8A shows a case where the connector 2 is used in a right angle type. In this case, the L-shaped portion is formed by an L-shaped bent portion 5b and an edge continuous with the L-shaped bent portion 5b of the flat plate portion 5a. The end face 21 is soldered to the fixing pattern 19. The soldered portion 22 is a portion indicated by hatching in the figure. In the case of the right angle type, due to the shake at the time of insertion / removal of the other connector 31 (arrow C in FIGS. 1 and 8), the side 3 far from the soldering portion 8 of the terminal 3 is greatly shaken. Since the soldering portion 22 with the L-shaped end surface 21 is located on the side where such displacement increases, the housing 4 is prevented from being displaced during the insertion / removal operation of the other connector 31. The influence on the soldering state is prevented, and peeling of the soldered portion of the terminal 3 is prevented.

  FIG. 8B shows a case where the connector 2 is used in a straight type. In this case, a vertically long U-shaped end surface 23 formed by a pair of second engaging pieces 5d and an edge portion continuous with those of the flat plate portion 5a is used. Solder to the fixing pattern 19. The soldered portion 24 is a portion indicated by hatching in the figure. In the case of the straight type, the portion to which the housing 4 is to be displaced due to the deflection (arrow D in FIGS. 1 and 8) when the other connector 31 is inserted and removed is both sides corresponding to the pair of second engaging pieces 5d. It becomes a shake. The soldering portion 24 with the vertically long U-shaped end surface 23 extends so as to reach both sides where such displacement becomes large, and the reinforcing metal fitting 5 is fixed by being soldered over the entire length of the soldering portion 24. Further, the reinforcing metal fitting 5 has its L-shaped bent portion 5b abutted against the end surface of the end wall portion 4d of the housing 4 as described above, and both ends of the end wall portion 4d are pressed by the pair of L-shaped bent portions 5b. Therefore, the displacement of both shakes of the housing 4 can be suppressed in the insertion / removal operation of the other connector 31. This prevents the soldering state of the soldering portion 8 of the terminal 3 from being affected in the same manner as described above, and prevents the soldered portion of the terminal 3 from being peeled off.

  The present invention has been described with reference to the preferred embodiments. However, as those skilled in the art can easily understand, the present invention is not limited to such embodiments, and the gist of the present invention. As long as it does not deviate from the above, it can be appropriately changed. For example, although the mail (male) terminal is described in the above embodiment, the same applies to a female (female) terminal. Moreover, although it showed about the connector which has the several terminal arrange | positioned in parallel, it is applicable also to the connector of only one terminal, and when the reinforcement metal fitting 5 was attached to the both sides of the housing 4, but there are few terminals Only one side may be sufficient. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

  The connector according to the present invention can securely fix the reinforcing metal fitting to the substrate by, for example, soldering, and is useful as a miniaturization of the surface mount connector.

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Connector 3 Terminal 4 Housing 5 Reinforcement metal fitting 5a Flat plate part, 5b L-shaped bending part, 5c Engagement piece, 5d Second engagement piece, 5e Claw 6 Leg part 7 Projection part, 7a Base part, 7b Taper part 7c Contact part 8 Soldering part 9 Holding part, 9b Shoulder part 15 Holding groove, 15a Convex engaging part 16 Holding hole 17 Recess 19 Fixing pattern 21 L-shaped end face 22 Soldering part 23 Longitudinal U-shaped end face 24 Soldering part

Claims (4)

A connector having a terminal, a housing for holding the terminal, and a reinforcing metal fitting attached to an end of the housing and soldered to a printed circuit board,
The reinforcing metal fitting is formed by bending a plate material, and is provided so as to form a flat plate portion along the end surface of the housing and a U-shaped cross-sectional shape facing the flat plate portion and together with the flat plate portion. An engagement piece,
The housing has a recess recessed in a direction parallel to the end face;
The connector is characterized in that the reinforcing metal fitting is attached to the housing in a state where a portion between the concave portion and the end surface of the housing is sandwiched between the engaging piece and the flat plate portion.   The connector according to claim 1, wherein the engagement piece has a claw protruding so as to engage with an inner surface of the recess.   The connector according to claim 1 or 2, wherein the reinforcing metal fitting has an L-shaped end face for soldering to the printed circuit board in an L-shape. The flat plate portion has an edge along the substrate;
The connector according to claim 3, wherein the L-shaped end surface is provided on at least one end side of the edge of the reinforcing metal fitting.

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