JP2012079664A - Board connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a board connector capable of suppressing stresses on a soldered portion of a terminal fitting.SOLUTION: A board connector 10 includes: a housing 11 having a hood 12, the surface of which is to be mated with a housing of a counterpart connector, to be attached on a circuit board P; and a plurality of terminal fittings 20, penetrating through a back wall 13 of the hood 12 and arranged in parallel to each other. The anterior portions of the plurality of terminal fittings 20 are inwardly-projecting in the hood 12 to be terminal connection portions 25 to which terminal fittings of the counterpart connector are connected while the rear portions of the plurality of terminal fittings 20 are projecting from the back wall 13 to be board holding portions 26 extending toward the circuit board P. The end portions of the extending board holding portions 26 are to be fixed on electrically-conducting paths of the circuit board P by soldering. The board holding portions 26 of the terminal fittings 20 each have elastically-deformed portions 30 which are made stretched-thin by striking the middle part of each board holding portion 26.

Description

  The present invention relates to a board connector.

  Conventionally, what was described in patent document 1 is known as an example of the board | substrate connector. This is a horizontally long housing that is mounted on a circuit board with a hood part to which a mating housing is fitted on the front surface, and is arranged side by side in a form that penetrates the back wall of the hood part back and forth. A plurality of rectangular wire-like terminal fittings, and the front side of each terminal fitting is a terminal connecting portion that protrudes into the hood and is connected to the mating terminal fitting, while the rear side is the back wall The board is fixed to the circuit board and then bent at a right angle toward the circuit board. The tip of the board fixing part is inserted into the through hole of the circuit board and fixed by soldering.

JP 2008-234856 A

By the way, in this type of board connector, bending stress acts on the terminal fitting due to the difference in thermal expansion between the housing and the circuit board when the location of the placement is in a high temperature atmosphere, and as a result, the soldering portion of the terminal fitting. There was a risk that the stress would act on the substrate to cause cracks and reduce the reliability of connection to the circuit board. In particular, when the housing becomes more horizontally long due to multiple poles, the above-described problem becomes remarkable.
The present invention has been completed based on the above circumstances, and an object thereof is to suppress the stress from acting on the soldered portion of the terminal fitting.

  The present invention has a hood portion that is fitted on the front surface with a hood portion into which a mating housing is fitted, and a housing that is mounted on a circuit board, and is arranged side by side in a form that penetrates the back wall of the hood portion in the front-rear direction. A plurality of terminal fittings, and the front side of the terminal fitting protrudes into the hood portion and is connected to a mating terminal fitting, while the rear side protrudes from the back wall. In the board connector, the board fixing portion extending toward the circuit board and the extending end of the board fixing portion being fixed to the conductive path of the circuit board by soldering are used. It is characterized in that an elastically deforming portion that is thinned and widened by hitting in the lateral width direction is formed at an intermediate position in the length direction of the substrate fixing portion of the metal fitting.

  According to the above configuration, even when a positional deviation occurs between the housing and the circuit board due to a difference in thermal expansion, bending stress is suppressed from being generated in the terminal fitting while the deviation is absorbed by the deformation of the elastic deformation portion, As a result, it is suppressed that a stress acts on the soldering part of a terminal metal fitting, and a crack generation is prevented. In addition, since the elastically deforming portion is thinned and widened by applying pressure in the lateral width direction, the cross-sectional area is unchanged and does not affect the electrical resistance. As a result, the reliability of the electrical connection of the terminal fitting to the circuit board can be ensured.

The following configuration may also be used.
(1) The board fixing portion of the terminal fitting is shaped to be bent at a right angle toward the circuit board after protruding backward from the back wall of the hood portion, and the terminal fitting is in a straight posture. After the hood portion is penetrated from the rear surface side with respect to the back wall, the protruding end side of the substrate fixing portion protruding rearward from the back wall in a straight posture is bent at a right angle. The elastic deformation portion is formed on a base end side that protrudes straight toward the rear in the substrate fixing portion.
When the board fixing part is bent after penetrating the terminal fitting into the back wall of the housing, it is only necessary to bend the front side of the elastically deforming part, and the bending work can be easily performed, and as a result, the assembly work of the board connector is performed efficiently. be able to.

(2) The board fixing portion of the terminal fitting has a shape that protrudes rearward from the back wall of the hood portion and is bent at a right angle toward the circuit board, and the elastic deformation portion is fixed to the board. Is formed on the bent portion side of the portion.
The surface area of the elastically deformed portion is enlarged. On the other hand, although it can be said that the soldering part of the terminal fitting generates a large amount of heat, the elastically deforming part having an enlarged surface area is located near the heat generating part as described above, so that the heat dissipation function can be effectively exhibited.

  According to the present invention, it is possible to suppress the stress from acting on the soldered portion of the terminal fitting, to prevent the occurrence of cracks, and to ensure the reliability of electrical connection.

The top view of the connector for substrates concerning Embodiment 1 of the present invention. Rear view Cross-sectional side view Side view with the circuit board mounted Terminal metal perspective view Plan view Side view The side view of the state which mounted | wore the circuit board with the board | substrate connector which concerns on Embodiment 2. FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 4, the board connector 10 according to this embodiment includes a synthetic resin housing 11 and a plurality of L-shaped terminal fittings 20 mounted on the housing 11. The housing 11 is fixed on the circuit board P, and each terminal fitting 20 is soldered and fixed to the corresponding conductive path of the circuit board P.

  The housing 11 includes a hood portion 12 having a horizontally long rectangular tube opening on the front surface, and a terminal fitting 20 is press-fitted and held on the back wall 13 of the hood portion 12. A mating housing (not shown) is fitted in the hood portion 12 of the housing 11, and a mounting portion 17 is formed so as to protrude from the rear end position on the lower edge on both side surfaces of the housing 11. .

A plurality of terminal insertion holes 14 are formed on the back wall 13 of the hood portion 12 in two upper and lower stages. The terminal insertion hole 14 has a square cross section, and the upper terminal insertion hole 14 has a constant interval of 8 at the left end in the rear view and 7 at the right end, except for the central portion in the width direction. Opened and formed side by side. Twenty-one lower terminal insertion holes 14 are formed side by side at the same interval across the entire width, and the upper and lower terminal insertion holes 14 are aligned in the vertical direction.
At the rear end of each terminal insertion hole 14, a square introduction port 15 that is one size larger is formed.

  The terminal fitting 20 is formed in an L shape by bending a square wire, and is provided with two types of terminals, a relatively long upper terminal fitting 20A and a short lower terminal fitting 20B. . In the following, when the description is made separately for the upper stage and the lower stage, it is described separately as “terminal fitting 20A” and “terminal fitting 20B”, and when described in common, it is described as “terminal fitting 20”. To do.

Although the basic shapes of the terminal fittings 20A and 20B are the same, the terminal fitting 20A on the upper stage side will be described as an example with reference to FIGS.
First, the terminal fitting 20A is formed in a form that is connected to the carrier in a straight posture (see a chain line in FIG. 3) by pressing the hoop material.

More specifically, the terminal fitting 20A is mainly composed of a square wire having a square cross section that can be fitted into the terminal insertion hole 14 on the housing 11 side, and both ends thereof are tapered. A press-fit portion 21 to be press-fitted into the terminal insertion hole 14 is formed at a position about 1/3 of the entire length from one end side (right end side in FIG. 6) of the terminal fitting 20A. The press-fit portion 21 is formed by extending the left and right side surfaces so as to be widened, and a biting portion 22 protrudes at a midway position in the length direction on the side surface of the protruding portion. Further, the front end of the overhanging portion is a tapered surface 23 for guiding.
Immediately after the press-fit portion 21 described above, stoppers 24 are formed so as to protrude from both the left and right side surfaces. Both stoppers 24 can be brought into contact with the right and left side edges of the rear edge of the terminal insertion hole 14 that opens to the introduction port 15.

A portion of the terminal fitting 20A on the front side from the press-fitting portion 21 protrudes into the hood portion 12 when mounted on the housing 11 as will be described later, and mates in the mating housing fitted in the hood portion 12. The terminal connection portion 25 is connected to a terminal fitting (not shown).
On the other hand, the rear side of the stopper 24 in the terminal fitting 20A is a board fixing part 26, and the board fixing part 26 is bent at a right angle at a predetermined position in a substantially central part in the length direction in post-processing. ing. The tip of the board fixing part 26 is inserted into the through hole Ph of the circuit board P and fixed by soldering.

Now, an elastic deformation portion 30 is formed at the base end portion 27 that forms a straight posture continuous from the terminal connection portion 25 in the board fixing portion 26 of the terminal fitting 20A.
The elastically deforming portion 30 has a predetermined length region at a substantially central portion in the length direction of the base end portion 27 of the substrate fixing portion 26 after the terminal fitting 20A formed in a straight posture is separated from the carrier. By being pressed from both sides in the lateral width direction, it is thinned and formed into an outer shape square. The cross-sectional area of the elastic deformation part 30 formed in this way is the same as the cross-sectional area of the original shape.

  In the lower terminal fitting 20B, the length of the terminal connecting portion 25 is the same as that of the upper terminal fitting 20A, while the length of the board fixing portion 26 is shorter than the predetermined length. However, as shown in FIG. 3, the substrate fixing portion 26 is bent at a right angle at a predetermined position in a substantially central portion in the length direction in post-processing, and the base end portion 27 of the substrate fixing portion 26 is formed. It is the same that the elastically deformable portion 30 is formed in a shape that is thinned and widened into an outer square by being pressed from both sides in the lateral width direction.

  The board connector 10 is assembled as follows. First, the lower terminal fitting 20 </ b> B is press-fitted into the terminal insertion hole 14 on the lower stage side of the back wall 13 of the housing 11. More specifically, the terminal connection part 25 of the terminal fitting 20B in a straight posture is inserted into the terminal insertion hole 14 from the introduction port 15 at the rear end, and when the final stage of the insertion, the press-fitting part 21 is located on the left and right sides of the terminal insertion hole 14. It is press-fitted between the side walls, and the stopper 24 is stopped in front by hitting the left and right side edges of the rear edge of the terminal insertion hole 14. During this time, the biting portions 22 on both side surfaces of the press-fitting portion 21 further bite into the side wall, thereby preventing backward slipping.

When the straight terminal fitting 20B is press-fitted in this manner, the terminal connection portion 25 protrudes into the hood portion 12 of the housing 11, and the board fixing portion 26 protrudes in a straight posture from the rear wall 13 toward the rear. Become. When the press fitting of all the lower terminal fittings 20B is completed, the protruding end side of the board fixing portion 26 of the terminal fitting 20B is bent downward at a right angle by using an appropriate jig.
Subsequently, in the same manner, when the upper terminal fitting 20A is in a straight posture, it is press-fitted from the rear into the upper terminal insertion hole 14 of the rear wall 13 of the housing 11, and all the terminal fittings 20A are press-fitted to the normal position. Similarly, the protruding end side of the board fixing portion 26 of the terminal fitting 20A is bent downward at a right angle.

  As a result, the assembly of the terminal fitting 20 to the housing 11 is completed, and the terminal connection portions 25 of the respective terminal fittings 20 are the same in two upper and lower stages from the back wall 13 into the hood portion 12 as shown in FIG. On the other hand, from the rear surface of the back wall 13, a substrate fixing part 26 bent into an L shape is projected in two upper and lower stages, except that the downward bent part 28 has an upper terminal fitting. 20A and the lower terminal fitting 20B are arranged so as to be lined up at an interval in the front-rear direction, and the distal end of the bent portion 28 reaches the position below the predetermined dimension from the lower surface of the housing 11. The base end portion 27 of the board fixing portion 26 in all the terminal fittings 20 is provided with an elastic deformation portion 30.

In the board connector 10 assembled as described above, the tip of the downward bent part 28 in the board fixing part 26 of all the terminal fittings 20 is inserted into the through hole Ph formed in the circuit board P, while the housing 11 The circuit board P is placed at the end of the circuit board P with the hood part 12 facing outward, and penetrates the circuit board P from the lower surface side of the circuit board P with respect to the mounting parts 17 provided on both side surfaces of the housing 11. The screw S is fixed by screwing. After that, by attaching solder to the through hole Ph from the lower surface side of the circuit board P, the board fixing portion 26 of each terminal fitting 20 is electrically connected to the corresponding conductive path formed on the circuit board P. The
When a mating connector (not shown) is fitted to the hood portion 12 of the board connector 10 attached to the circuit board P in this way, the terminal connection portion 25 of each terminal fitting 20 is accommodated in the mating connector. It will be connected to the corresponding mating terminal.

  When the board connector 10 attached to the circuit board P as described above is disposed, for example, in a place having a high temperature atmosphere, the difference in thermal expansion between the housing 11 and the circuit board P causes the arrow line in FIG. As shown in FIG. 5, there is a possibility that a positional deviation in the lateral direction may occur. Here, since the elastic deformation part 30 is formed in the board | substrate fixing | fixed part 26 of each terminal metal fitting 20, when a position shift arises as mentioned above, a shift | offset | difference is absorbed by the elastic deformation part 30 deform | transforming. However, the occurrence of bending stress in the terminal fitting 20 is suppressed, and as a result, the stress is suppressed from acting on the soldered portion H of the terminal fitting 20 to prevent the occurrence of cracks. Further, since the elastically deformable portion 30 is thinned and widened by applying pressure in the lateral width direction, the cross-sectional area is unchanged and does not affect the electrical resistance. As a result, the reliability of the electrical connection of the terminal fitting 20 to the circuit board P can be ensured.

  In this embodiment, when the terminal fitting 20 is mounted, the straight terminal fitting 20 is press-fitted into the back wall 13 of the hood portion 12 from the rear, and then the board fixing portion 26 protrudes rearward from the rear wall 13 in the straight posture. However, the elastic deformation portion 30 is formed on the base end portion 27 of the substrate fixing portion 26 that remains in a straight posture. Therefore, when the board fixing part 26 is bent, it is only necessary to bend the front side of the elastic deformation part 30, and the bending work can be easily performed. As a result, the board connector 10 can be assembled efficiently.

<Embodiment 2>
FIG. 8 shows a second embodiment of the present invention. In this embodiment, the elastic deformation portion 30 is formed at the bent portion 28 on the distal end side of the board fixing portion 26 that is bent into an L shape in the terminal fitting 40. About another structure, it is the same as that of the said embodiment, Comprising: The duplicate description is simplified or abbreviate | omitted by attaching | subjecting the same code | symbol suitably about the member and site | part which have the same function.

  Also in the second embodiment, when a displacement occurs due to a difference in thermal expansion between the housing 11 and the circuit board P, the elastic deformation portion 30 is deformed to absorb the displacement, and a bending stress is generated in the terminal fitting 40. In the same manner, the stress is suppressed from acting on the soldered portion H of the terminal fitting 40, and the occurrence of cracks is prevented. Similarly, the elastic deformation portion 30 does not change its cross-sectional area and does not affect the electrical resistance, so that the reliability of the electrical connection of the terminal fitting 40 to the circuit board P can be ensured.

  Moreover, the surface area of the elastically deformable portion 30 formed into a thin and widened shape is enlarged. On the other hand, although it can be said that the soldering portion H of the terminal fitting 40 generates a large amount of heat, in the present embodiment, the elastic deformation portion 30 having an enlarged surface area is located near the bent portion 28 of the board fixing portion 26, that is, the heat generation portion. Since it is formed, the heat dissipation function is also effectively exhibited.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) You may provide an elastic deformation part in both the base end part and bending part in the board | substrate fixing | fixed part of a terminal metal fitting.
(2) In the above embodiment, the case where the board fixing portion of the terminal fitting is bent into the L shape is illustrated as being bent after the terminal fitting is attached to the housing. You may make it keep.
(3) The number of steps when the terminal fitting is mounted on the housing and the number of steps in each step are not limited to those exemplified in the above embodiment, and can be arbitrarily set.

(4) In the above embodiment, the terminal fixing part of the terminal fitting protruding from the rear face of the housing is bent in an L shape. However, the fixing part of the terminal fitting protrudes from the rear face of the housing in a straight posture. The board connector of the type that is placed on the circuit board with the front face of the housing facing upward, and the tip of the straight board fixing part is inserted into the through hole of the circuit board and soldered, The present invention is equally applicable.
(5) The present invention provides a surface mount type board connector for soldering and fixing the tip of the board fixing portion of the terminal fitting protruding to the rear side of the housing directly to a conductive path formed on the circuit board. Can be applied similarly.

DESCRIPTION OF SYMBOLS 10 ... Board connector 11 ... Housing 12 ... Hood part 13 ... Back wall 14 ... Terminal insertion hole 20, 20A, 20B, 40 ... Terminal metal fitting 21 ... Press-fit part 25 ... Terminal connection part 26 ... Board fixing part 27 ... Base end part 28 ... Bending part 30 ... Elastic deformation part P ... Circuit board Ph ... Through hole H ... Soldering part

Claims (3)

A housing that has a hood part to which a mating housing is fitted on the front surface and is mounted on a circuit board, and a plurality of terminal fittings arranged side by side in a form penetrating the back wall of the hood part back and forth And the front side of the terminal fitting is a terminal connecting portion that protrudes into the hood portion and is connected to the mating terminal fitting, while the rear side protrudes from the back wall and then the circuit board. In the board connector, the board fixing part extending toward the board, and the extension end of the board fixing part is fixed to the conductive path of the circuit board by soldering.
A board connector, characterized in that an elastically deforming portion that is thinned and widened by pressing in the lateral width direction is formed at a midpoint in the length direction of the board fixing portion of the terminal fitting. The board fixing portion of the terminal fitting is shaped to be bent at a right angle toward the circuit board after projecting rearward from the back wall of the hood portion, and the terminal fitting is in a straight posture. After being penetrated from the rear side with respect to the back wall of the part, the protruding end side of the substrate fixing part protruding rearward from the back wall in a straight posture is bent at a right angle,
The board connector according to claim 1, wherein the elastically deforming portion is formed on a base end side projecting straight toward the rear of the board fixing portion. The board fixing part of the terminal fitting is shaped to be bent at a right angle toward the circuit board after protruding rearward from the back wall of the hood part, and the elastic deformation part is formed in the board fixing part. The board connector according to claim 1, wherein the board connector is formed on a bent portion side.

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