JP5517999B2 - Surface mount connector - Google Patents

Description

  The present invention relates to a surface mount connector that is fixed by soldering a contact on a printed wiring board, and more particularly to a surface mount connector in which an insulating housing does not fall even when an external force is applied from various directions.

  The surface mounting connector that is surface-mounted on the printed wiring board is soldered to the land pattern on the printed wiring board, and the contact leg that protrudes from a part of the insulating housing is connected to the mating connector. When receiving external force from the side connector, or when other electronic components come into contact with other electronic components during assembly or transfer to the device, these external forces can cause large bending stress on the solder joints of the contact legs. Occurs, the insulation housing falls, or the contact solder connection part peels off, resulting in a connection failure.

  In particular, automotive surface mount connectors used for applications that always connect to the mating connector are subject to vibration or contact pressure from the mating connector at high temperatures, and the soldered parts are easily damaged. It was necessary to hold on the printed wiring board.

  Therefore, in a conventional surface mount connector that accommodates a large number of contacts in an insulating housing, the leg portions of the large number of contacts that are attached to be insulated from each other in the longitudinal direction of the insulating housing protrude in front and rear in the short direction of the insulating housing. A surface mount connector is known in which the bottom surface of each leg is soldered to a land pattern of a printed wiring board (Patent Document 1). According to this connector, since the insulation housing is fixed by soldering at two or more positions separated by a certain distance in both the longitudinal direction and the short direction of the insulation housing, the insulation housing receives an external force in any direction. However, a large bending stress does not occur in a specific soldering part.

  Further, as shown in FIG. 7, in the surface mount connector 100 in which the legs of the plurality of contacts 102 are drawn out to one side (rear side) of the short side of the insulating housing 101, the other side of the short side of the insulating housing 101 is used. A reinforcing metal fitting 103 is attached to the side (front side) to prevent the insulating housing 101 from overturning (Patent Document 2). The reinforcing metal fitting 103 is formed in an L-shaped cross section, and its rear end is press-fitted into a concave groove 104 formed in the front surface of the insulating housing 101 and fixed.

  In the surface mount connector 100, not shown leg portions of the contacts 102 protruding rearward of the insulating housing 101 are soldered to the land pattern on the printed wiring board, and each reinforcing metal fitting 103 is also soldered to the dummy pattern on the printed wiring board. In addition, even if the insulating housing 101 receives an external force from the front-rear direction in the short direction, the insulating housing 101 does not fall over and a large rotational moment does not act on the soldered portion of the leg portion.

JP 2010-146728 A Japanese Patent No. 4203348

  The former conventional surface mount connector has a structure that can be used only for a connector in which a large number of contacts are attached to an insulating housing. In addition, two types of contacts are required to pull out the legs forward and backward, and two types of contacts are required. Since it is attached to the insulating housing, there is a problem that the structure and assembly of the insulating housing become complicated.

  Further, in the latter surface mount connector 100, it is necessary to prepare the reinforcing metal fitting 103 unnecessary for the purpose of use as an original connector and attach it to the insulating housing 101. This causes an increase in cost and the front of the insulating housing 10. In addition, a mounting space on the printed wiring board is required, which is an obstacle to high-density mounting.

  The present invention has been made in view of such problems, and without using a separate component such as a reinforcing bracket, the insulating housing may fall down even if it receives external force from various directions with only one contact. An object of the present invention is to provide a surface mount connector in which a large bending stress is not generated in a soldered portion.

  In order to achieve the above-described object, the surface mount connector according to claim 1 is configured such that a part protruding from the insulating housing of the contact positioned and fixed to the insulating housing is solder-connected to a land pattern formed on the surface of the printed wiring board. A surface mount connector for electrically connecting a land terminal and a mating terminal contacting a contact, and fixing an insulating housing on a printed wiring board, and a bottom plate portion disposed on the printed wiring board, and both left and right sides of the bottom plate portion And a pair of engaging protrusions protruding in front of the pair of side wall portions, the bottom plate portion between the bottom plate portion and the pair of side wall portions. An insulating housing formed with a contact receiving recess for receiving a contact inserted from the rear parallel to the base plate, and a fixed member fixed to the insulating housing along the plane of the bottom plate portion. A piece, a contact piece that is cantilevered at the front end of the fixed piece and elastically contacts the mating terminal, and is folded back in a U shape from the left and right rear ends of the fixed piece. A pair of strip-shaped leg pieces arranged along the line, and a pair of engagement hooks that are continuously provided from the front of the pair of strip-shaped leg pieces and are respectively formed at corresponding portions of the pair of engagement protrusions. A contact piece, and sandwiching the bottom plate portion between the fixed piece and the pair of strip-shaped leg pieces, and engaging the pair of engaging hooks with the engaging projections projecting from the upper side to the corresponding portion, The bottom surface is solder-connected to the land pattern.

  The bottom surface of the pair of strip-shaped leg pieces whose longitudinal direction is the front-rear direction is soldered, and the engaging hook continuously provided from the front engages the engaging protrusion of the insulating housing from above, so that the front of the insulating housing is Even if the insulating housing is fixed to the printed wiring board and receives an external force directed rearward, the front does not float up, and bending stress does not concentrate on the soldered portion behind the belt-shaped leg piece.

  Since the rear end of the bottom plate portion is sandwiched between the fixed piece fixed to the insulating housing and the strip-shaped leg piece to which the bottom is soldered, the rear of the insulating housing is fixed to the printed circuit board, and the insulating housing Even if an external force is applied to the front, the rear does not float, and the bending stress does not concentrate on the soldering portion in front of the strip-shaped leg piece.

  In addition, the bottom surface of the pair of strip-like leg pieces separated from each other on the left and right is soldered, and the insulating housing is fixed to the contact by the engaging hook and the fixing piece. No bending stress is concentrated on the left and right soldered portions.

  In the surface mount connector according to claim 2, the front surface of the engagement hook of the contact inserted forward to the position where the pair of engagement protrusions are accommodated in the contact accommodating recess is in contact with the rear surface of the engagement protrusion. A protruding portion is provided at a portion of the side wall where the engaging protrusion and the engaging hook are engaged.

  When the contact is inserted from the rear into the contact accommodating recess, the contact can be accommodated at an appropriate position of the insulating housing with reference to the position where the front surface of the engagement hook contacts the rear surface of the engagement protrusion.

  The surface mount connector according to claim 3 is formed by pulling out from the front side of the strip-shaped leg piece so that the engagement hook stands up along the outer surface of the side wall portion, and when the strip-shaped leg piece is soldered, The solder fillet formed on the side surface of the solder is visible from above.

  Since the engagement hook is formed by being pulled out from the front of the belt-like leg piece so as to stand along the outer surface of the side wall, when the bottom surface of the belt-like leg piece is soldered, Also, a solder fillet is formed, and the contact is more firmly fixed to the printed wiring board.

  Since the solder fillet formed on the side surface of the engagement hook is visible from above, the solder connection state can be confirmed.

  In the surface mount connector according to claim 4, the contact position of the contact piece that receives the downward contact pressure from the counterpart terminal is located behind the center position in the front-rear direction of each pair of strip-shaped leg pieces. Features.

  The contact receives a downward contact pressure from the mating terminal at the contact position, and the contact position is behind the center position of the strip-shaped leg piece fixed to the printed circuit board. The contact is fixed by soldering the bottom surface of the strip-shaped leg piece with the longitudinal direction as the longitudinal direction to the printed circuit board, and the insulating housing is the strip-shaped leg piece. Since the engagement hook formed on the front side is engaged from above the engagement protrusion, the front side does not float upward.

  According to the first aspect of the present invention, the insulating housing can be firmly fixed on the printed wiring board by one contact accommodated in the insulating housing without using the auxiliary metal fitting, and the insulating housing can be applied regardless of the external force from any direction. A part of will not float or fall.

  Moreover, even if the contact or the insulating housing receives an external force from any direction, an excessive stress is not generated in a specific soldering portion, and it is possible to prevent a connection failure due to pattern peeling of the solder connecting portion.

  According to the second aspect of the present invention, the engaging protrusion can be used as a stopper for the contact inserted from the rear into the contact accommodating recess, and the contact can be accurately positioned and accommodated in the contact accommodating recess.

  In addition, the strip-shaped leg piece whose bottom surface serves as a solder connection portion with the land pattern can be accurately positioned with respect to the insulating housing.

  According to the third aspect of the present invention, the solder fillet is formed on the side surface of the engagement hook that acts to prevent the front edge housing from being lifted forward, and the contact can be more firmly fixed to the printed wiring board.

  Moreover, since the formation state of the solder fillet can be visually confirmed from above, the mounting state on the printed wiring board can be confirmed using an automatic camera or the like.

  According to the invention of claim 4, even if the mating terminal comes into contact with the contact and a rotational moment is generated in the direction in which the front part is lifted up by the contact pressure, the engagement hook and the engagement protrusion are engaged. Because of this, a reaction force that eliminates the rotational moment is generated, so even if used in a poor environment where the mating connector is always in contact and the soldered part is subject to vibration at high temperatures, such as for in-vehicle use, the front of the insulating housing Does not float up and pattern peeling of the solder connection portion does not occur.

1 is a perspective view showing a state in which a surface mount connector 1 according to an embodiment of the present invention is mounted on a surface of a printed wiring board 10. FIG. It is the perspective view which looked at the surface mount connector 1 from the downward direction. 1 is an exploded perspective view of a surface mount connector 1. FIG. 1 is a plan view of a surface mount connector 1. FIG. 4 is a rear view of the insulating housing 2. FIG. It is the perspective view which looked at contact 3 from the lower part. It is a perspective view of the conventional surface mount connector 100. FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view showing a state in which a surface mount connector 1 according to an embodiment of the present invention is mounted on the surface of a printed wiring board 10, and FIG. 4 is a plan view of the surface mount connector 1 as viewed from above. In FIG. 4, each part of the surface mount connector 1 will be described with the upper side being the front, the lower side being the rear, and the left and right direction being the left and right direction.

  As shown in FIG. 3, the surface mount connector 1 includes an insulating housing 2 and a contact 3 accommodated in the insulating housing 2. The insulating housing 2 is integrally formed in a rectangular parallelepiped box shape as shown in FIG. 3 using an insulating synthetic resin such as a liquid crystal polymer having excellent heat resistance that does not deform at a high temperature in a reflow furnace. A pair of side wall portions 22, 22 erected from both the left and right sides of the portion 21 and the bottom plate portion 21 form a contact accommodating recess 23 whose rear and upper part are opened inside.

  As shown in FIG. 1, the surface mount connector 1 according to the present embodiment has a bottom plate portion 21 of an insulating housing 2 arranged along the surface of a printed wiring board 10. Here, the battery is press-molded into a flat plate shape. The mating terminal, which is the terminal of the contact, approaches from above the insulating housing 2 and comes into contact with the contact 3 protruding upward from the contact housing recess 23. The contact piece 31 of the contact 3 that comes into contact with the mating terminal is bent obliquely downward on the rear side by being pushed down from the mating terminal, so that the upper side of the contact receiving recess 23 is rearward so as not to interfere with the contact piece 31. The side is open.

  As shown in FIG. 5, locking projections 35 and 35 of the contact 3 described later are press-fitted between the left and right side edges of the bottom plate portion 21 and the side walls 22 and 22 to position the fixing piece 33 of the contact 3. Fixing grooves 24 and 24 for fixing are respectively formed.

  Engaging protrusions 25 and 25 each having a stepped portion facing the rear are integrally projected at the corners of the lower front end of the outer side surface of the side walls 22 and 22. The upper surface 25a of the step portion is parallel to the bottom plate portion 21 and serves as an engagement surface that engages with a lower surface 36a of an engagement hook 36 described later of the contact 3, and the rear surface 25b of the vertical surface is an engagement hook 36 that slides from the rear. This is a contact surface that contacts the front surface 36b.

  A plurality of spacer blocks 26 are further provided on the outer side surfaces of the side walls 22, 22. In the present embodiment, a plurality of contacts 3 integrally connected by a carrier are collectively assembled to a plurality of insulating housings 2 arranged at corresponding portions. In this case, the insulating housings are arranged in the left-right direction. When the spacer block 26 between the two abuts, a space in the left-right direction is maintained, and a sliding space for an engagement hook 36 described later that slides along the outer surface of the side wall portion 22 is secured.

  The contact 3 is formed by punching a metal plate having excellent conductivity and elasticity, such as phosphor bronze, and then bending it so as to be bent into an elongated strip shape as shown in FIGS. The reverse U-shaped contact piece 31, the connecting piece 32, the fixed piece 33, and the pair of strip-shaped leg pieces 34, 34 are integrally connected to each other, and are directed from the front ends of the pair of strip-shaped leg pieces 34, 34 toward the left and right sides. Thus, the engaging hook 36 is integrally provided continuously.

  The reverse U-shaped contact piece 31 is cantilevered at the front end of the fixed piece 33 via a connecting piece 31 that curves forward, and as shown in FIG. The upper curved portion is supported by protruding from the contact receiving recess 23. A rib 31a along the longitudinal direction protrudes from the curved portion of the contact piece 31 at the center in the width direction. By projecting the ribs 31a toward the outside of the curved surface, contact reliability can be obtained by making line contact with the flat plate-like mating terminals that are in contact with each other, and the strength of the curved portion is increased. Even if the contact piece 31 receives external force, it does not deform. Guide plates 31b and 31b bent at right angles from the left and right ends are connected to the rear side (the tip side of the contact piece 31 where the rib 31a is not formed) from the curved portion of the contact piece 31. . The guide plate 31b is arranged in parallel with the side wall 22 of the opening edge when the contact 3 is arranged in the contact accommodating recess 23, and guides the contact piece 31 downward when connecting to the counterpart terminal, When an unintended external force is applied from the left and right directions, the abutment comes into contact with the side wall portion 22 and acts to prevent torsional deformation of the contact piece 31.

  The fixing piece 33 is formed in the shape of a rectangular thin plate having a thickness slightly thinner than the height of the fixing groove 24 of the insulating housing 2 described above, and a pair of locking projections 35 and 35 are provided on the left and right sides thereof. . The pair of locking projections 35 and 35 are locked to the inner surfaces of the fixing grooves 24 and 24 when the left and right sides of the fixing piece 33 are inserted forward along the fixing grooves 24 and 24 of the corresponding portions. The fixing piece 33 that presses forward to a predetermined position is positioned and fixed to the insulating housing 2 in a state of being arranged along the plane of the bottom plate portion 21.

  The pair of strip-shaped leg pieces 34 are connected to left and right portions of the rear end of the fixed piece 33, respectively. As shown in FIG. 2, each strip-shaped leg piece 34 is fixed to the fixed piece from the rear to the front through a curved portion that is folded 180 degrees so as to surround the rear surface of the fixed piece 33 from the connecting portion with the fixed piece 33. It is arranged along the left and right sides of the bottom surface of 33. The bottom surfaces of the strip-shaped leg pieces 34 serve as solder connection surfaces that are solder-connected to the land patterns on the opposite printed wiring board 10. As a result of soldering, the contact 3 is firmly fixed to the printed wiring board 10 against an external force in any of the front, rear, left and right directions.

  The engaging hook 36 is drawn from the front end of the belt-like leg piece 34 to the left and right sides along the horizontal plane, and the drawn side edge is bent upward at a right angle, whereby the contact 3 is formed on the insulating housing 2. When attached, the bottom plate portion 21 is arranged so as to stand along the outer surface of the side wall portion 22 from the bottom surface. The step portion that appears on the side surface of the engagement hook 36 is formed in a complementary shape that meshes with the step portion of the engagement protrusion 25, and the step lower surface 36 a of the engagement hook 36 is the upper surface of the engagement protrusion 25 as described above. A front surface 36b, which is a vertical surface of the engagement hook 36, serves as a contact surface that contacts the rear surface 24b of the engagement protrusion 25 on the engagement surface that engages with the engagement protrusion 25a.

  The contact 3 is further extended from the both sides of the pair of strip-shaped leg pieces 34, 34 to the left and right sides, and then bent upward at a right angle so as to stand along the outer surface of the side wall 22. The guide pieces 37, 37 are integrally formed. The guide pieces 37 and the engagement hooks 36 arranged on the left and right sides slide along the outer surface of the side wall 22 when the fixing piece 33 of the contact 3 is assembled while being press-fitted forward into the fixing groove 24. A pair of belt-like leg pieces 34, 34 whose front ends are free ends are guided so as to move along the front-rear direction of the bottom plate portion 21.

  Next, a process from assembling the surface mount connector 1 configured as described above to surface mounting on the printed wiring board 10 will be described. As described above, the surface mount connector 1 is press-fitted with a plurality of contacts 3 collectively from the rear with respect to the plurality of insulating housings 2 aligned in the left-right direction in accordance with the pitch of the plurality of contacts 3, and is arranged correspondingly. Assemble to the insulating housing 2.

  As shown in FIG. 3, the contact 3 is assembled from the rear of the contact receiving recess 23, with the fixing piece 33 along the plane of the bottom plate portion 21, and the locking projections 35, 35 on both sides thereof The contact 3 is inserted forward so as to be inserted into

  As the contact 3 is inserted forward into the contact receiving recess 23, the engagement hooks 36, 36 and the guide pieces 37, 37 erected on the side of the pair of strip-shaped leg pieces 34 extend along the outer surface of the side wall part 22. The belt-shaped leg pieces 34 are guided so as to move forward along the bottom surface of the bottom plate portion 21.

  When the contact 3 is inserted to a predetermined accommodation position, the front surfaces 36b of the pair of engagement hooks 36 and 36 come into contact with the rear surface 25b of the opposing engagement protrusion 25, and the insertion of the contact 3 in the front is restricted. The In this insertion position, the locking projections 35 and 35 are locked to the inner surfaces of the fixing grooves 24 and 24, and the front surface 36 b of the engagement hook 36 and the rear surface 25 b of the engagement protrusion 25 come into contact with each other. Positioning in the front-rear direction with respect to the insulating housing 2, both sides of the fixing piece 33 and / or the locking projections 35 are inserted into the fixing groove 24, so that the fixing piece 33 of the contact 3 is moved up and down with respect to the insulating housing 2. Positioned in the left-right direction. Further, when the lower surface 36 a of the engagement hook 36 is engaged with the upper surface 25 a of the engagement protrusion 25, lifting of the front of the insulating housing 2 with respect to the pair of strip-shaped leg pieces 34 is restricted, and the insulating housing 2 Since the bottom plate portion 21 is sandwiched between the pair of strip-shaped leg pieces 34 and the fixed piece 33, the contact 3 and the insulating housing 2 are integrated.

  After assembling each contact 3 to the insulating housing 2, the contacts 3 are disconnected, and the contacts 3 and the insulating housing 2 are separated for each integrated surface mount connector 1. Thereafter, the surface mount connector 1 is placed on the printed wiring board 10 by the chip mounter so that the pair of strip-shaped leg pieces 34 is placed on the land pattern to which the cream solder is applied. Thereafter, the cream solder is melted through a reflow oven, and the pair of strip-shaped leg pieces 34 and the land pattern are soldered. In this surface mounting process, a part of the solder leaking from the bottom surface of the strip-shaped leg piece 34 rises along the outer side surfaces of the guide pieces 37 and 37 and the engaging hooks 36 and 36 to form a solder fillet. As a result, the contacts 3 are soldered to the positions of the guide pieces 37 and the engaging hooks 36 that are separated from each other in the front, rear, left, and right directions in addition to the bottom surfaces of the pair of strip-shaped leg pieces 34 being soldered and fixed to the printed wiring board 10. A fillet is formed and is more firmly fixed to the printed wiring board 10.

  The surface mount connector 1 mounted on the printed wiring board 10 through this surface mounting process is subjected to pattern peeling of the soldered portion due to the insulating housing 2 tilting or floating from the board 10 regardless of the external force from any direction. Will not occur. That is, the pair of strip-shaped leg pieces 34 separated from each other on the left and right are arranged with the front-rear direction as the longitudinal direction, and the bottom surface thereof is solder-connected to the opposing printed wiring board 10. The insulating housing 10 firmly fixed to the printed wiring board 10 against external force and positioned so that the contact 3 is integrated in the front, rear, left and right directions is not inclined even if it receives external force from each direction. Bending stress due to external force does not concentrate on the solder joints.

  In particular, as in the surface-mounted connector 1 according to the present embodiment, the flat mating terminal and the contact 3 are always connected under an environment subject to high temperature and vibration, and one of the insulating housings 2 is always connected from the contact pressure. Even when receiving the force in the direction in which the portion is lifted, the inclination of the insulating housing 2 can be reliably prevented. In the surface mount connector 1 described above, the contact position of the contact piece 31 pushed down by the counterpart terminal with the counterpart terminal moves rearward from the free state shown in FIG. Accordingly, the contact position is the center position of the fixing region for fixing the surface mount connector 1 to the printed wiring board 10, that is, the rear position from the center position of the pair of strip-shaped leg pieces 34 having the longitudinal direction as a guide as a guide. The insulating housing 2 receives a bending moment in the direction in which the front end moves upward through the contact 3 due to the contact pressure of the counterpart terminal that constantly pushes down the contact 3. However, the front and front engaging hooks 36 of the pair of strip-shaped leg pieces 34 are soldered, and the engaging portion 25 in front of the insulating housing 2 is engaged with the engaging hooks 36 from below. Even if the rotating moment is continuously received below, the insulating housing 2 does not tilt backward and the solder connection part in the front does not peel off the pattern.

  In the present embodiment, as shown in FIG. 4, the spacer block 26 is not formed above the arrangement portion of the guide pieces 37, 37 and the engagement hooks 36, 36, and can be viewed from above. Accordingly, when the contact 3 is press-fitted from the rear, an automatic camera or the like that images from above whether or not the lower surface 36a of the engagement hook 36 is engaged with the upper surface 25a of the engagement protrusion 25 at a predetermined accommodation position. Can be confirmed. In addition, after the surface mounting process, whether or not the solder fillets are correctly formed on the outer surfaces of the guide pieces 37 and 37 and the engagement hooks 36 and 36 can be confirmed using an automatic camera or the like.

  In the above-described embodiment, the example in which the counterpart terminal descends from above and contacts the contact 3 has been described. However, the connection direction is not limited to the vertical direction, and the surface on which the counterpart terminal is connected from the front of the insulating housing 2. A mounting connector may be used.

  In addition, the engaging protrusion 25 and the engaging hook 36 can have any engaging shape as long as they engage with the engaging hook from above the engaging protrusion.

  Further, the spacer block 26 and the guide pieces 37, 37 are arbitrarily formed in an insulating housing or a contact as necessary, and are not necessarily required for carrying out the present invention.

  The present invention is suitable for a surface mount connector for soldering a part of a contact on the surface of a printed wiring board, and in particular, for connecting a flat terminal provided on a battery pack, or connecting a terminal provided on a metal frame. Suitable for surface mount connectors where the mating terminal is always connected, such as applications.

DESCRIPTION OF SYMBOLS 1 Surface mount connector 2 Insulation housing 3 Contact 10 Printed wiring board 21 Bottom board part 22 Side wall part 23 Contact accommodation recessed part 25 Engagement protrusion 31 Contact piece 33 Fixed piece 36 Engagement hook

Claims (4)

A part of the contact that is positioned and fixed to the insulation housing is soldered to the land pattern formed on the surface of the printed wiring board, and the other terminal that contacts the contact is electrically connected to the land pattern and insulated. A surface mount connector for fixing a housing on a printed wiring board,
A bottom plate portion disposed on the printed circuit board, a pair of side wall portions erected along both the left and right sides of the bottom plate portion, and a pair of engaging projections respectively protruding in front of the pair of side wall portions. An insulating housing in which a contact housing recess for housing a contact inserted from the rear parallel to the bottom plate portion is formed between the bottom plate portion and the pair of side wall portions;
A fixed piece fixed to the insulating housing along the plane of the bottom plate, a contact piece that is cantilevered at the front end of the fixed piece and elastically contacts the mating terminal, and a U-shape from the left and right rear ends of the fixed piece And a pair of belt-like leg pieces arranged along the bottom surface of the fixed piece with the front-rear direction as the longitudinal direction, and a pair of belt-like leg pieces connected from the front of the pair of belt-like leg pieces. A contact integrally having a pair of engaging hooks respectively formed;
While sandwiching the bottom plate part between the fixed piece and the pair of belt-like leg pieces, the pair of engaging hooks are engaged with the engaging protrusions protruding from the upper part to the corresponding parts,
A surface mount connector characterized in that a bottom surface of a strip-shaped leg piece is solder-connected to a land pattern. In the pair of engaging protrusions, the front surface of the engaging hook of the contact inserted forward to the position where it is accommodated in the contact accommodating recess contacts the rear surface of the engaging protrusion, and the engaging protrusion and the engaging hook are engaged. The surface mount connector according to claim 1, wherein the surface mount connector protrudes from a portion of the side wall portion to be joined. The engagement hook is formed by pulling out from the front of the belt-like leg piece so as to stand along the outer surface of the side wall, and a solder fillet formed on the side surface of the engagement hook when the belt-like leg piece is soldered. The surface mount connector according to claim 1, wherein the surface mount connector is visible from above. The contact position of the contact piece that receives a downward contact pressure from the counterpart terminal with the terminal is located behind the center position in the front-rear direction of each pair of strip-shaped leg pieces. Surface mount connector.

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