JPH0969371A - Electric connector and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the application of the excessive stress to a soldered part even in the case where a temperature cycle exists by providing a second bending part, which is bent to the direction for separating from a board along the shape of a housing, in a contact of a stage closest to the board. SOLUTION: Tine parts 11C-13C of contacts 11-13 of an electrical connector are bent at an upward bending part G1 and a downward bending part G2 in the directions opposite to each other. The contacts 11-13, which are arranged in multiple stages, are detour formed. With this structure, spring back to be generated in each bending part is offset as the whole. As a result, a pitch P'2 at the tip between the tine parts 11C and 12C and a pitch P'3 at the tip between the tine parts 12C and 13C can be reduced, and as a whole, an occupied area (mounting area) on a board can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connector, and more particularly to a header connector in which legs of contacts are fixed to a printed circuit board or the like by soldering, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A so-called header connector mounted on a circuit board is widely used for interconnecting electronic or electric devices. This header connector has a plurality of contacts each having a leg portion (tine portion) that penetrates the rear end wall from the inside of the insulating housing and is bent in a substantially vertical direction (direction parallel to the rear end wall). .

Generally, the contacts are arranged in a plurality of rows (steps) inside the housing, and a plurality of contacts are arranged in each row, so that one connector has many contacts. Will be things.

The tip portion of the tine portion of the contact is inserted into a through hole provided in the substrate (referred to as a dip type) or in contact with the surface of the substrate (referred to as SMT (substrate surface mounting) type). ), It is fixed on the board by soldering and is electrically connected to the electric circuit provided on the board.

By the way, the header connector fixedly mounted on the substrate as described above is often used as an input / output unit of a central processing unit (CPU) for control of various mechanical devices and controls various functions of an automobile. It may be used as an input / output unit of the CPU. If installed in a car, this CP
U may be placed near the engine room or in the engine room. In such a case, the board and connector housing may expand or contract due to being exposed to the ambient temperature that changes from the outside temperature to the high temperature range due to the heat of the engine. I will repeat.

On the other hand, the board is made of glass-filled epoxy resin material (coefficient of thermal expansion 1.5 × 10 ⁻⁵ / ° C.) and the connector housing is made of polybutylene terephthalate (PBT) resin material (coefficient of thermal expansion 9.0 × 10 ⁻⁵ / ° C.). It is generally formed. Since there is a large difference in the coefficient of thermal expansion between these two materials, as shown in FIG. 5A, the pitch between the contacts 11 of the housing 14 on the connector 10 side or the contact 12
As a result of making a difference in the degree of expansion and contraction in the directions of arrows A and B between the inter-pitch and the pitch between the contact joints of the substrate 20 (for example, the through holes 21 through which the tines of the contacts 11 are inserted), as shown in FIG. However, a load may be applied to the connecting portion of the solder 30 on the substrate 20 which is a connecting portion between the both, and a crack 31 may be generated in the solder 30 by repeating the temperature cycle.
When a crack is generated in the solder joint in this way, there is a risk that electrical conduction will be incomplete at the crack and the CPU's original function may not be exhibited.

The above problem occurs in a connector having a plurality of contacts in the height direction from the board at a solder joint portion with a contact on the side closest to the board (contact 11 in FIG. 5A). It is considered to be easy to do, and various solving techniques have been disclosed conventionally.

For example, according to Japanese Patent Laid-Open No. 4-61767, the legs of the contacts on the side closer to the board are extended to the mating surface (opening end surface) side of the connector, and the extended tips are attached to the board. To be soldered to (Fig. 1 of the same publication),
Extend the legs of the contacts near the board to the legs of the contacts on the upper side (the side far from the substrate) to a position further away from the wall surface through which these contacts pass, and then extend the extended tips. What is soldered to a substrate (Fig. 4 of the same publication) is disclosed.

Each of these increases the amount of bending of the contact leg in the elastic deformation region by extending the contact leg, and the degree of expansion and contraction between the contact pitch of the housing and the contact joint pitch of the substrate. This difference is absorbed by the increased deflection, and the load on the solder joint is reduced.

Further, JP-A-6-203896 and JP-A-7-1535.
No. 08 discloses that the arc-shaped stress absorbing portion is formed in the bent portion of the leg portion of the contact.

[0011]

However, in each of the above-mentioned prior arts, in the case where the leg portion of the contact is extended to the fitting surface side, the solder joint for the contact group on the lower stage (the side closer to the board) is used. The parts are on the mating surface side, while the solder joints of the contact group on the upper stage (the side far from the board) are on the wall surface side through which the contacts are inserted, and the solder joints are located at two positions in front of and behind the connector. Will be dispersed. In this case, the stroke amount required for the bonding operation is increased in the manufacturing process of bonding the contact and the substrate with solder, and it is necessary to inspect these two dispersed locations also in the quality inspection process of the bonding portion. There is a problem that the process becomes complicated.

Further, there is a problem in that it is possible to deal with the case where the contact arrangement is in the upper and lower two stages, but it is not possible to deal with the case where the contact is more than three stages.

On the other hand, in the case where the leg portion is extended to a position farther from the rear wall surface through which the contact penetrates, the connector occupying (mounting) area on the board becomes large, and there is a demand for downsizing the device. I can't. This method can also be applied to staggered connectors in which the upper and lower contacts do not line up in the same straight line in the height direction, but the lower row of contacts should be placed in the connector where the contacts line up in a substantially straight line in the vertical direction. There is a problem that the extension cannot be applied because it interferes with the upper contact.

Further, in the case where the bent portion of the leg portion of the contact has an arc-shaped stress absorbing portion, in order to form this arc-shaped stress absorbing portion, as shown in FIG.
It requires machining using two bending jigs a, b, and c. Similar to the above, when machining the lower contact for a matrix array connector in which the upper and lower contacts line up on the same straight line. In addition, there is a problem that the jig a cannot be applied because it interferes with the contact directly above.

The present invention has been made in view of the above circumstances, and can be easily applied to a connector having a matrix array of multi-step contacts, and without complicating the manufacturing process or the inspection process. An object of the present invention is to provide an electrical connector that prevents the solder joint portion between a contact of a connector and a substrate from being excessively stressed even when subjected to a temperature cycle by reducing the load, and a manufacturing method thereof. To do.

[0016]

In the electrical connector of the present invention, when the leg portions of the contacts are exposed from the rear end surface of the housing, the electrical connector follows the curved shape formed at the outer open end of the through hole of the housing. By circumventing the leg, the leg length can be secured longer and a larger stress can be absorbed.

That is, the electrical connector of the present invention has a housing in which an opening end face and a rear end wall are arranged perpendicularly to a substrate on which the electrical connector is mounted, and an inside of the housing that penetrates the rear end wall of the housing. And has a bent portion that extends toward the outside of the housing and is bent toward the substrate so as to be substantially parallel to the rear end wall, and the vicinity of the tip end portion is fixed substantially perpendicular to the substrate. In an electrical connector having a plurality of contacts provided in a height direction from the board, the contacts having at least the step closest to the board penetrates a rear end wall of the housing. The outer opening end of the formed hole on the side far from the substrate is formed in a curved shape, and the contact at the step closest to the substrate is formed so as to follow the curved shape of the housing. It is characterized in that it has a second bent portion which is diverted in a direction et away.

Here, the opening end surface means the fitting tip of the housing when fitting with the mating connector, and the outer opening end portion means the housing outer surface side of the contact insertion hole formed in the housing rear end wall. Means the end of.

Further, the curved shape formed at the outer opening end of the hole through which the contact penetrates the rear end wall of the housing on the side far from the substrate, as shown in FIG. 6 (A), is the opening end. Includes a curved shape (for example, an R shape) with the corners dropped, and a convex shape having a semicircular cross section formed outward from the opening end as shown in FIG. The same applies to the following inventions.

The curved shape need only be formed at least at the outer opening end on the side far from the substrate, and does not hinder formation along the entire circumference of the opening end.

The second bent portion may have any shape as long as it has a length substantially longer than that of the conventional leg portion.

Furthermore, the electrical connector of the present invention does not prevent formation of this second bent portion for contacts other than the contact at the stage closest to the substrate,
These contacts can be formed in the same manner as the contacts in the stage closest to the substrate. In this way, when the contact other than the contact at the stage closest to the substrate is also applied, it is possible to effectively prevent the bypass portion of the contact at the stage closest to the substrate from contacting the contact at the next stage.

The contact closest to the substrate is bent in a direction perpendicular to the substrate and away from the substrate, and is continuous with the extending portion in a direction perpendicular to the substrate. It is most desirable to have a shape that is bent in the direction of approaching the substrate. This is because by forming such a shape, the occupied (mounting) area of the leg projected onto the substrate surface can be minimized.

Further, regarding the contacts other than the contact at the stage closest to the substrate, even if the bypass portion is not formed as described above, elastic deformation of the contact is caused at the position exposed from the outer rear end surface of the housing. It is desirable that the bent portion is formed while applying a load in a direction away from the substrate within the range.

In order to obtain the desired bending angle (usually 90 degrees) at the bent portion, the spring 13 generated at this bent portion is estimated and the contact 13 is bent at an angle α of less than 90 degrees. It is necessary to operate (Fig. 8 (A))
reference). However, if such a bending operation is performed, the tip end side of the leg portion of the contact 13 being operated is closer to the connector 14 side than the bending position thereof, and therefore, there is a risk of interfering with the contact in the lower step. , Bending operation becomes difficult.

Therefore, the springback is estimated in advance, and as shown in FIG. 8B, a load is applied in the direction away from the substrate 20 within the range of elastic deformation of the contact 13 to obtain the angle Δ.
By elastically deforming by α and bending the leg of the contact 13 to an angle α of less than 90 degrees in this state, the tip side of the leg of the contact 13 being operated is more than the bent position. The bending operation can be facilitated without approaching the connector 14 side.

When the curved shape formed at the outer open end of the through hole of the rear end wall of the housing is R-shaped, the radius of the R-shape is 1/2 or more of the plate thickness of the leg portion of the contact. It is desirable to do. This is because if the radius is less than 1/2 of the plate thickness of the leg portion of the contact, stress is likely to concentrate and the dimension of the bent portion is not stable.

In the method of manufacturing the electrical connector of the present invention, the rear end wall of the housing is penetrated from the inside of the housing in which the opening end face and the rear end wall are arranged perpendicular to the board on which the electrical connector is mounted. Of an electrical connector for manufacturing an electrical connector by bending a plurality of contacts extending outside the housing and provided in a plurality of stages in a height direction from the substrate toward the substrate so as to be substantially parallel to the rear end wall. In the manufacturing method, the bending direction of the housing outer opening end portion of the through hole formed in the rear end wall of the housing through which the contact penetrates at least the step of the contact closest to the substrate. It is characterized in that it is bent along a curved shape formed at the end portion on the opposite side.

Also in the method of manufacturing the electrical connector of the present invention, the contacts other than the contact at the stage closest to the substrate are not prevented from being bent at the rear end wall, and these contacts are also closest to the substrate. It may be formed similarly to the step contact. When applied to contacts other than the contact in the stage closest to the substrate in this manner, it is possible to prevent the bypass portion of the contact in the stage closest to the substrate from contacting the contact in the lower stage, It is possible to perform processing by narrowing the distance between the leg portions on the tip end side of the bent portion, and it is possible to reduce the mounting area on the substrate.

Further, even when the detouring portion as described above is not formed for the contacts other than the contact at the stage closest to the substrate, it is within the elastic deformation range of the contact at the position exposed from the rear end surface of the housing. It is desirable to form the bent portion while applying a load in the direction away from the substrate.

[0031]

The electrical connector of the present invention is substantially formed by forming the leg portions of the contact in the step closest to the board among the contacts in the multi-step arrangement so as to bypass the board once in the direction away from the board. The length of the legs can be increased, and as a result, the amount of bending of the long legs within the elastic deformation range can be made larger than before, and the pitch between the contacts of the housing and the contact joint of the substrate can be increased. The difference in the degree of expansion and contraction with the inter-pitch can be absorbed by this increased amount of bending, and the load on the solder joint can be reduced.

Further, by pressing such a bypass shape against the curved shape formed on the rear end wall of the housing, the contact can be easily bent in the direction away from the substrate, and the contact is bent along this curve. Also, stress does not concentrate in an extremely narrow range such as a corner.

Furthermore, since the bending is performed in the direction opposite to the bending direction at the bent portion, the spring back generated at the bent portion is
This can be offset by the opposite springback caused by bending at the rear wall of the housing.

The method of manufacturing the electrical connector of the present invention is
By pressing the contacts into the curved shape formed on the rear wall of the housing, the contacts can be easily bent away from the board, simplifying the processing jig for easily forming the bypass part that is the stress absorbing part. can do.

Furthermore, it is possible to process by making the interval of the leg portion closer to the tip end portion than the bent portion narrower, and to reduce the mounting area on the substrate.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the electrical connector of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an electric connector according to this embodiment, and FIG. 2A is an AA of the electric connector shown in FIG.
Sectional drawing which shows a line cross section, the same figure (B) shows the enlarged view of the K section of the electrical connector shown to (A).

The illustrated electrical connector (header connector) 10
Is a housing 14 formed of an insulating material such as polybutylene terephthalate resin and the connector 10
Penetrates the contact portions 11a, 12a, 13a housed inside the housing 14 and the rear end wall 14a of the housing 14 that come into contact with the contacts of the mating connector when the mating connector is fitted with the mating connector (not shown). The holding portions 11b, 12b, 13b which are inserted into the insertion holes 14c formed by the above and are press-fitted into the housing 14 and the rear end wall 14 of the housing 14.
a contact 11 formed of tines (legs) 11c, 12c, 13c fixedly connected to a substrate 20 having a printed wiring extending from a to the outside of the housing 14 and extending in a direction substantially orthogonal to the rear end wall 14a, It has a configuration including 12 and 13.

As shown in FIG. 1, the contacts 11, 12, 13 are arranged in a straight line in the height direction from the substrate 20, and a plurality of contacts 11, 12, 13 are arranged in each stage. . The contacts arranged in the step closest to the board 20 (the bottom step) are 11, the contacts arranged in the step farthest from the board 20 (the top step) are 13, and the contacts are arranged substantially in the middle (middle step). Twelve arranged contacts.

The substrate 20 is arranged below the housing 14 in the figure. The tine portion 11c of the lowermost contact 11 among the above contacts has a shape detoured in the direction away from the substrate 20. Specifically, as shown in FIG. 2 (A), this detoured shape has a housing outer opening of an insertion hole 14c formed in the rear end wall 14a at a position exposed from the rear end wall 14a to the outside of the housing 14. The end portion is bent upward along a convex portion 14b having a semicircular cross section formed on the side farther from the substrate 20 (upper side), and the bent portion (second
The bent portion) is folded back in an inverted U-shape so as not to come into contact with the middle contact 12 (first bent portion) and extends downward. That is, a conventional contact is a housing
The contact 11 of the present embodiment is formed in the detoured shape as described above, while the contact 11 of the present embodiment is formed in the detoured shape as described above, while the contact 11 of the present embodiment is formed by the detoured shape. The length of the tine portion 11c is extended by about 2L as compared with the above.

The radius R of the convex portion 14b having a semicircular cross section formed on the rear end wall 14a of the housing 14 is set within the range of R ≧ t1 / 2 when the plate thickness of the contact 11 is t1. It is desirable to do. This is because when the radius R is less than the plate thickness t1 / 2, it is difficult to stabilize the bending dimension of the contact 11 and the stress tends to concentrate. In this embodiment, R =
0.6mm and t1 = 0.64mm are adopted.

The contact 11 is initially formed in a linear shape (the shape shown by the chain double-dashed line in FIG. 2B), and is later bent into an inverted U shape (FIG. 2B). The shape indicated by the solid line in) is the inner peripheral side of the part, and in order to prevent wrinkles from occurring due to excess wall thickness caused by bending, the bending stress is concentrated and the force required for processing is applied. In order to reduce the thickness, a cutout portion (see FIG. 2B) is provided so as to be thinner than the other portion (thickness t1). However, it is preferable that such a notch is provided, but the present invention is not limited to this.

The notch may be formed by, for example, pressing when molding the contact 11 alone, or may be formed by cutting after molding. The value of the thickness ratio t2 / t1 between the thinned portion 11e and other portions may be set to, for example, about 0.9.

Next, the contact 11 shown in FIG.
A method of forming the detour shape will be described with reference to FIG.

First, attach the linear contact 11 to the housing 14
The thin-walled portion 11e is inserted into the through hole 14c of the housing 14 and is exposed to the outside of the housing 14 at the lower side (board side) in the drawing.
Is pressed by the jig 1 in the counterclockwise direction R1 with a slight force, and the side closer to the tip of the tine portion 11c than the thin portion 11e is moved from above by the jig 2 in the clockwise direction R2.
(See FIG. 3A). Since the bending stress concentrates on the thin portion 11e, the thin portion 11e begins to bend so as to be convex upward due to the slight pressing force of the jig 1 and the pressing force of the jig 2, and the root portion exposed from the housing 14 is located behind the housing 14. It begins to bend upward along the peripheral surface of the convex portion 14b provided on the end surface 14a. When the thin portion 11e begins to bend, the jig 1
Is retracted to the lower side D, but the jig 2 continues to press the contact 11 in the clockwise direction R2 (FIG. 7B).

As a result of the jig 2 continuing to press the contact 11, the tine portion 11c is bent until it comes into contact with the rear end surface 14a of the housing 14 (FIG. 7C). Here, the jig 2 is retracted to the original position, but the bent tine portion 11c is
Due to the spring back generated at each of the two bent positions, the bending angle is slightly relaxed to form the above-described detour shape (FIG. (D)).

The detour shape formed by the above-described forming method is configured so as not to come into contact with the contact 12 in the middle stage, but the accuracy of parts of the contact 11 in the lowermost stage and the tine portion.
In order to more reliably prevent accidental contact with the middle contact 12 due to variations in the machining accuracy of 11c, the tine portion 12c of the middle contact 12 is also bent upward as shown in FIG. 2 (A). The detour shape may be used. Similarly, the tine portion 13c of the uppermost contact 13 can also have a detour shape.

The contacts 1 in the middle and upper stages
By bending each of the tine parts 12c and 13c of 2 and 13 once in opposite directions, the directions in which the springbacks occur in the respective bent parts also conflict, so that the springbacks can be canceled as a whole. effective.

That is, in the conventional contact as shown in FIG. 4 (A), since the bent portion is only one place of the downward bent portion G1, in order to set the bending angle α to 90 degrees,
The bending angle α was set to about 80 degrees in advance, considering the springback amount to about 10 degrees in advance. When the bending angle α is set to an acute angle in this way, the tip portions of the tine portions 12c and 13c are closer to the rear end wall of the housing 14 as the lengths L2 and L3 from the bent portion to the tip portion are longer. Expected amount P
It is necessary to set large values of 2 and P3. Therefore, in order to prevent the tip portions of the tine portions 12c and 13c from contacting each other during bending, the pitch P'2 at the tip portion between the tine portions 11c and 12c and the tip portion between the tine portions 12c and 13c. It was necessary to set a large pitch P'3 in. Specifically, it was about P'2 = 4.5 and P'3 = 4.5 (mm).

On the other hand, the contacts 11, 12, 13 (FIG. 7B) of the electrical connector of this embodiment have tine portions 11c, 12 respectively.
Bending of c and 13c in the downward bending portion G1 and the upward second bending portion G2 in mutually opposite directions (bending angles β and α)
By doing so, the springback generated at each bent portion is canceled out as a whole, and as a result, the pitch P'2 and the tine portions 12c, 13 at the tip portion between the tine portions 11c, 12c are canceled.
The pitch P′3 at the tip portion between c can be made smaller than that of the conventional one, and the effect that the entire connector (occupied) on the substrate can be made smaller can be obtained. Specifically, P'2 = 3.0 and P'3 = 3.0 (mm) can be realized, and P'2 = P'3 = 1.5 (mm).
It has been confirmed by the applicant of the present invention to reduce the size to a certain degree.

According to the electric connector 10 of the present embodiment having the above-described structure, the contacts 11, 12, 13 in the multi-step arrangement are arranged.
Each of the tine portions 11c, 12c, 13c having a detoured shape allows the tine portions 11c, 12c,
The length of 13c can be made longer than the conventional one, and as a result, the amount of bending that can be absorbed within the elastic deformation range increases, and the pitch between the contacts of the housing 14 and the pitch between the contact joints of the substrate 20 expands and contracts. The difference in the degree can be absorbed by the increased bending amount, and the load on the solder joint can be reduced. Since the tine portion 11c of the lowermost contact 11 is shorter than the tine portions 12c and 13c of the other contacts 12 and 13, at least the contact 11 at the lowermost stage has the detoured shape, the same effect as the above effect can be obtained. be able to.

As described above, the electric connector of the present invention is not limited to the detoured shape for the uppermost contact 12 and the middle contact 13, but, for example, FIG.
As shown in, even if the final shape of the contacts other than the bottommost contact is not the detour shape, at the manufacturing stage, the root portions of the tines 12c and 13c (after the housing 14) By deforming G2), which is a portion immediately after being exposed from the end wall 14a, within the range of elastic deformation, the tine portion 11 in the final stable shape is formed.
Pitch P'2, P'at the tip between c, 12c and 13c
3 can be made smaller than the conventional one.

This is a contact as shown in FIG.
By applying a load in a direction away from the substrate 20 within the range of elastic deformation of 13 to elastically deform by an angle Δα, by bending the leg portion of the contact 13 to an angle α of less than 90 degrees in this state, Since the tip side of the leg of the contact 13 during operation does not come closer to the connector 14 side than the bent position, it is possible to perform bending even if the pitch between the contacts is narrowed. is there.

In the electrical connector of the present embodiment, the detour shape of the tine portion 11c of the lowermost contact 11 is bent upward in parallel with the rear end wall 14a, and the bent extension portion has an inverted U shape. Although the example of the shape folded back in a shape has been described, the electric connector of the present invention is not limited to the shape shown in the embodiment, and various types can be used within a range not contacting the tine portion of the contact above the lowermost contact 11. The shape of can be adopted. However, the bending direction at the base of the tine portion exposed from the rear end wall 14a is preferably a shape bent upward from the horizontal direction.

Further, the tip shape of the tine portion is not limited to the illustrated linear shape suitable for insertion into the through holes 21, 22, 23 of the substrate 20, and may be a bent shape suitable for SMT.

Furthermore, in the above embodiment, the housing 14
The rear end wall 14a is provided with a convex portion 14b having a semicircular cross section. Instead of such a convex portion 14b, as shown in FIG.
As shown in, the inner wall surface of the insertion hole 14c may have a curved shape so as to chamfer the corner of the opening end of the insertion hole.
In this case, the curved shape may be an R surface,
It is desirable that the radius R of the surface is also set in the range of R ≧ t / 2 where t is the plate thickness of the contact 11.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric connector according to an embodiment of the present invention.

2A is a cross-sectional view showing a cross section taken along the line AA of the electric connector shown in FIG. 1, and FIG. 2B is an enlarged view of a portion K of the electric connector shown in FIG.

FIG. 3 is a diagram showing a method for forming a detour shape.

4A is a diagram showing a pitch between tip ends of tine portions according to a conventional contact shape, and FIG. 4B is a diagram showing a pitch between tip ends of tine portions according to a contact shape according to an embodiment of the present invention.

FIG. 5A is a perspective view showing an external shape of a conventional connector, and FIG. 5B is a cross-sectional view showing cracks in a solder joint portion caused by applying an excessive load to the solder joint portion.

FIG. 6 is a view showing a curved shape formed on a rear end wall of the housing.

FIG. 7 is a diagram showing a conventional method of forming a stress absorbing portion on a bent portion of a contact.

FIG. 8 is a diagram showing a method of forming a bent portion in a load state in an elastic deformation region for contacts other than the lowermost stage.

FIG. 9 is a diagram showing another embodiment.

[Explanation of symbols] 10 Electrical connector (header connector) 11, 12, 13 Contacts 11c, 12c, 13c Tine part 14 Housing 14a Rear end wall 20 Board

Claims (3)

[Claims] 1. A housing in which an opening end surface and a rear end wall are arranged perpendicular to a board on which an electric connector is mounted, and an outside of the housing that penetrates the rear end wall of the housing from the inside of the housing. And a bent portion that is bent toward the substrate so as to be substantially parallel to the rear end wall, and has a leg portion that is fixed in the vicinity of the tip end portion substantially perpendicular to the substrate. An electrical connector including a plurality of contacts provided in a height direction from a substrate, wherein at least one of the contacts closest to the substrate is a hole of a hole penetrating a rear end wall of the housing. The outer opening end on the side farther from is formed in a curved shape, and the contact at the step closest to the substrate is detoured in a direction away from the substrate along the curved shape of the housing. An electrical connector having a bent portion. 2. The electrical connector according to claim 1, wherein the radius of the curved shape is 1/2 or more of the plate thickness of the leg portion of the contact. 3. The housing, in which the opening end face and the rear end wall are arranged perpendicular to the board on which the electrical connector is mounted, extends through the rear end wall of the housing to the outside of the housing, respectively. In a method of manufacturing an electrical connector, wherein a plurality of contacts provided in a height direction from the board are bent toward the board so as to be substantially parallel to the rear end wall, and an electrical connector is manufactured. At least the step of the step closest to the substrate is formed at the end of the through hole formed in the rear end wall of the housing through which the contact penetrates, opposite to the bending direction of the housing outer opening end. A method of manufacturing an electrical connector, characterized by bending along a curved shape.