TW201438355A - USB standard-conforming receptacle connector - Google Patents

Abstract

A USB standard-conforming receptacle connector which stably holds a USB connector plug is provided. A USB standard-conforming receptacle connector 2 is compliant with the USB standard, wherein the USB connector plug can be engaged or removed along an engaging direction thereof. The USB connector plug is compliant with the USB standard, comprising: a first contact, a first insulating material which holds the first contact, and a plug shell covering the first contact and the first insulating material, and a first engaging portion is formed. The USB standard-conforming receptacle connector 2 comprises: a second contact, a second insulating material which holds the second contact, and a shell 4, which covers the second contact and the second insulating material, and is provided with a locking portion 12b for holding the plug shell in a direction that prevents from disengagement, an electrical connection portion 14, and the second engaging portion engaged with the first engaging portion. The locking portion is provided near a tip portion of a spring portion 12 which extends in the engaging direction. The relationship between the center point of the width in the pitch direction, which is the pitch direction that the second contact of the base 12a of the spring portion is arranged, and the center point of the width in the pitch direction of the locking portion is: the center point of the base of the spring portion is located nearer or farther from the center line of the width in the pitch direction of the shell than the center point of the locking portion.

Description

USB specification reference socket connector

The present invention relates to a universal serial bus (USB) specification reference socket connector.

Previously, a socket connector including a locking portion for holding a USB plug connector has been known (for example, refer to Patent Document 1). In the above socket connector, a plate spring is provided on an upper surface and a bottom surface of a shell covering the contact and the insulating material of the retaining joint, and is formed at a front end portion of the leaf spring. The locking portion holds the conductive outer casing of the USB plug connector when mated with the USB plug connector.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-30452

However, for the socket connector, it is desirable to stably hold the USB plug connector when mated with the USB plug connector.

It is an object of the present invention to provide a USB standard reference socket connector that can stably hold a USB plug connector.

The USB standard reference socket connector of the present invention is based on a USB standard, and can be fitted or unplugged in a mating direction. The USB plug connector is based on a USB standard and includes: a first connector; a first insulating material holding the first joint; a plug housing covering the first joint and the first insulating material, and a first fitting portion; the USB standard reference socket connector comprising: a second joint; The second insulating material holds the second joint; and the outer casing covers the second joint and the second insulating material, and is provided with a locking portion and an electrical property that are held in a direction in which the plug housing is prevented from being detached from the fitting. a connection portion and a second fitting portion that is fitted to the first fitting portion; the USB standard reference socket connector is characterized in that the locking portion is provided near a front end portion of the spring portion extending in the fitting direction The relationship between the center point of the second joint arrangement pitch direction of the root portion of the spring portion, that is, the width in the pitch direction, and the center point of the width of the lock portion in the pitch direction is the center of the root portion Compared to the center point of the center line of the lock portion is arranged in the pitch direction further away from or closer to the width of the housing.

Further, the USB standard reference socket connector according to the present invention is characterized in that the center line of the width of the root portion of the spring portion in the pitch direction and the center line parallel to the fitting direction are located in the pitch direction of the lock portion. Outside the width range.

Further, in the USB standard reference socket connector of the present invention, the center point of the width of the spring portion in the pitch direction at the intermediate position of the locking portion and the root portion of the spring portion in the fitting direction is compared with A line connecting the center point of the width of the lock portion in the pitch direction and the center point of the width of the root portion of the spring portion in the pitch direction is disposed closer to or away from the width of the outer casing in the pitch direction The location of the centerline.

Further, in the USB standard reference socket connector of the present invention, one or more of the plug housings are electrically connected between a root portion of the spring portion and a center line of the width of the outer casing in the pitch direction. Electrical connection.

Further, the USB standard reference socket connector of the present invention is characterized in that one or more portions electrically connected to the plug housing are formed at a position closer to a side surface side of the housing in the pitch direction than a root portion of the spring portion. Electrical connection.

Further, the USB standard reference socket connector of the present invention is characterized in that one or more electric members electrically connected to the plug housing are formed at a position closer to the side surface of the outer casing in the pitch direction than the lock portion. Connection.

Further, in the USB standard reference socket connector of the present invention, one or more electrical connections electrically connected to the plug housing are formed between the locking portion and a center line of the width of the outer casing in the pitch direction. Connection.

Further, the USB standard reference socket connector of the present invention is characterized in that the root portion of the spring portion and the center line of the width of the outer casing in the pitch direction and the pitch direction of the outer casing are closer to the lock portion. One side of the side surface is formed with one or more electric wires electrically connected to the plug housing Sexual connection.

Further, the USB standard reference socket connector of the present invention is characterized in that a position on a side surface side in the pitch direction of the outer casing and a width in the pitch direction of the outer casing are larger than a root portion of the spring portion Between the center lines, one or more electrical connection portions electrically connected to the plug housing are formed.

According to the present invention, it is possible to provide a USB standard reference socket connector capable of stably holding a USB plug connector.

2‧‧‧USB specification reference socket connector

4‧‧‧Electrically conductive housing

6‧‧‧weld claws

10‧‧‧Mate

12‧‧‧Spring Department

12a‧‧‧ Root

12b‧‧‧Locking Department

14, 16‧‧‧Electrical grounding spring

20‧‧‧USB plug connector

21‧‧‧Insulation materials

22‧‧‧ plug housing

24‧‧‧ openings

30‧‧‧Cable centerline

32‧‧‧ Root center point

34‧‧‧Lockpoint Center

36‧‧‧Center line (a line passing through the center of the fitting direction of the root and the locking portion and parallel to the pitch direction)

38‧‧‧Spring width center point

40‧‧‧A line connecting the center point of the root with the center point of the locking part

42‧‧‧A line passing through the center of the root and parallel to the direction of the fitting

44‧‧‧Centerline of conductive housing

50‧‧‧The area on the side of the side of the gap in the direction of the conductive outer casing

60‧‧‧A region between the centerline of the conductive casing and the locking portion

62‧‧‧The area on the side of the side opposite to the root of the conductive outer casing

A‧‧‧Width of the conductive housing in the direction of the pitch

B‧‧‧width of the roots in the direction of the spacing

C‧‧‧The width of the locking section in the direction of the pitch

Fig. 1 is a perspective view of the USB standard reference socket connector of the embodiment as seen from above.

Fig. 2 is a perspective view of the USB standard reference socket connector of the embodiment as seen from the lower direction.

3 is a plan view of a USB standard reference socket connector of the embodiment.

Fig. 4 is a perspective view of the USB plug connector of the embodiment as seen from above.

FIG. 5 is a view showing a region in the case where an electric ground spring is formed on the side surface side of the lock portion of the USB standard reference socket connector according to the embodiment.

Fig. 6 is a view showing the shape of another spring portion of the embodiment.

Hereinafter, the USB specification of the embodiment of the present invention will be described with reference to the drawings. Reference socket connector. 1 is a perspective view of a USB standard reference receptacle connector according to an embodiment of the present invention as seen from above, and FIG. 2 is a perspective view of a USB standard reference receptacle connector according to an embodiment of the present invention viewed from a lower direction, and FIG. 3 is a perspective view of the USB standard reference receptacle connector of the present invention. A top view of a USB standard reference socket connector of the embodiment. 4 is a perspective view of the USB plug connector that is fitted to the USB standard reference socket connector according to the embodiment of the present invention as seen from above. In addition, the XYZ orthogonal coordinate system is set in FIG. 1 to FIG. 3, and the positional relationship of each member is demonstrated with reference to the said XYZ orthogonal coordinate system. The X-axis and the Y-axis are parallel to the upper surface of the conductive case described below, and the X-axis is set to be parallel to the width direction of the upper surface of the conductive case, that is, the pitch direction, and the Y-axis is set to be fitted to the USB plug connector. The direction (fitting direction) of the USB standard reference socket connector is parallel. Further, the Z axis is set to a direction orthogonal to the upper surface of the conductive outer casing. In the following description of the embodiment, the end portion of the conductive outer casing in the +Y direction in FIGS. 1 to 3 is referred to as the front end portion, and the end portion in the -Y direction of the conductive outer casing is set as the rear end portion. Ends.

The USB specification reference socket connector 2 can fit or unplug the standard USB plug connector (USB plug connector 20 (refer to FIG. 4)) based on the USB standard in the fitting direction, and includes: a plurality of connectors (not shown) An insulating material (not shown) for holding a plurality of joints arranged side by side in the pitch direction; and a conductive outer casing 4 covering the periphery of the joint and the insulating material and forming a fitting portion for fitting the USB plug connector 20 10.

The conductive outer casing 4 includes a conductor having a square tube shape having a length that is long in the pitch direction (X direction) and short in the thickness direction (Z direction) The profile of the shape. The left and right side surface portions on the front end side and the rear end side of the conductive outer casing 4 are provided with the welding claws 6 used when the USB standard reference socket connector 2 is mounted on the circuit board. The USB standard reference socket connector 2 is attached to the circuit board by soldering the tip end portion of the welding claw 6 to the circuit board.

As shown in FIG. 1, two spring portions 12 are provided on the upper surface of the conductive casing 4, and the spring portion 12 mechanically holds the USB when the USB standard reference socket connector 2 is fitted to the USB plug connector 20. The plug housing 22 of the plug connector 20 (refer to FIG. 4).

The spring portion 12 is a leaf spring-shaped elastic spring member that extends toward the distal end portion side (+Y direction), and has a claw-shaped locking portion 12b provided in the vicinity of the distal end portion, and the root portion 12a of the spring portion 12 is disposed in the pitch direction. The outer side of the way while flexing the shape. In other words, the root portion 12a of the spring portion 12 is formed in the vicinity of the side surface portion on the upper surface of the conductive outer casing 4, and the spring portion 12 has a shape that is bent outward from the locking portion 12b toward the root portion 12a in the direction of the pitch of the conductive outer casing 4. Here, the locking portion 12b protrudes to the inner space side of the conductive outer casing 4. The two spring portions 12 are provided at symmetrical positions with respect to a line passing through the center of the pitch direction of the upper surface of the conductive outer casing 4 and orthogonal to the pitch direction.

As shown in Fig. 2, two spring portions 12 are provided on the bottom surface of the conductive casing 4, and the spring portion 12 is a leaf spring-like elastic spring member that extends toward the front end side (+Y direction). Similarly to the spring portion 12 on the upper surface side, the spring portion 12 on the bottom surface side has a shape that is bent outward from the lock portion 12b toward the root portion 12a in the pitch direction. That is, the root portion 12a of the spring portion 12 on the bottom surface side is formed in the conductive outer casing 4 In the vicinity of the side surface portion on the bottom surface, the spring portion 12 on the bottom surface side has a shape that is bent outward from the locking portion 12b toward the root portion 12a in the direction of the pitch of the conductive outer casing 4. Here, the locking portion 12b protrudes to the inner space side of the conductive outer casing 4. The two spring portions 12 on the bottom surface side are provided at symmetrical positions with respect to a line passing through the center of the bottom surface of the conductive outer casing 4 in the direction of the pitch and orthogonal to the pitch direction.

A more specific shape and arrangement of the spring portion 12 will be described with reference to Fig. 3 . In FIG. 3, the width of the conductive outer casing 4 in the pitch direction is A, and the line passing through the center point of the width A and parallel to the fitting direction is referred to as the outer casing center line 30. Moreover, the width of the root portion 12a in the pitch direction is B, and the center point of the width B is the root center point 32. Moreover, the width of the lock portion 12b in the pitch direction is C, and the center point of the width C is the lock portion center point 34. Further, a line passing through the center of the fitting direction of the root portion 12a and the locking portion 12b and parallel to the pitch direction is referred to as a center line 36, and a center point of the width of the spring portion 12 in the pitch direction through which the center line 36 passes is referred to as a spring. Width center point 38.

The spring portion 12 has a shape in which the root center point 32 of the root portion 12a and the lock portion center point 34 of the lock portion 12b are such that the root center point 32 is disposed farther from the outer casing center line 30 than the lock portion center point 34. Further, the spring portion 12 has a shape in which the spring width center point 38 is disposed closer to the outer casing center line 30 than the straight line 40 connecting the root center point 32 and the lock portion center point 34. The center line 36 is bent near.

Further, the root portion 12a and the locking portion 12b are formed such that the line 42 passing through the root center point 32 and parallel to the fitting direction is located in the range of the width C of the locking portion 12b. Further, the position of the root center point 32 in the pitch direction is located outside the position in the pitch direction from the position of the lock portion 12b in the pitch direction.

In the present embodiment, the spring portion 12 is formed in a shape in which the root portion 12a is bent outward from the locking portion 12b toward the outer side in the pitch direction, and the root portion 12a is formed in the vicinity of the side surface portion on the upper surface of the conductive outer casing 4, and An electrical ground spring forming region for forming an electrical ground spring as an electrical connecting portion is secured between the two root portions 12a, and two electrical ground springs 14 are formed in the electrical ground spring forming region.

The electrical ground spring 14 is a leaf spring-shaped elastic spring member that extends toward the front end side (+Y direction), and the front end portion protrudes to the inner space side of the conductive outer casing 4. Further, the two electrical ground springs 14 are formed at symmetrical positions with respect to the outer casing center line 30 passing through the center of the conductive housing 4 in the pitch direction. That is, the electrical ground spring 14 is formed one between each of the root portion 12a and the outer casing center line 30 of the conductive outer casing 4.

Further, on the bottom surface of the conductive casing 4, similarly to the upper surface side, the spring portion 12 is bent outward from the locking portion 12b toward the root portion 12a in the pitch direction, and the root portion 12a is formed in the vicinity of the side surface portion, thereby An electrical ground spring forming region is secured between the root portions 12a, and two electrical ground springs 14 are formed in the above regions.

The electric grounding spring 14 on the bottom surface side is a leaf spring-shaped elastic spring member that extends toward the front end side (+Y direction), and the front end portion protrudes to the inner space side of the conductive outer casing 4. Further, the two electric ground springs 14 on the bottom surface side are formed in a symmetrical position with respect to the outer casing center line 30 passing through the center of the conductive housing 4 in the pitch direction. Set. That is, the electrical ground spring 14 on the bottom surface side is formed one between each of the root portion 12a and the outer casing center line 30 of the conductive outer casing 4.

Further, on both side faces of the conductive outer casing 4, a leaf spring-like elastic spring member is formed, that is, an electric ground spring 16 projecting to the inner space side of the conductive outer casing 4 is formed.

As shown in FIG. 4, the USB plug connector 20 includes: a plurality of joints (not shown); an insulating material 21 arranged side by side in the spacing direction to hold a plurality of joints; and a plug housing 22 covering the joint and the insulating material, and A fitting portion is formed, and the fitting portion is fitted to the USB standard socket connector 2 in which the fitting portion is formed. Further, two opening portions 24 are provided on the upper surface of the plug housing 22 of the USB plug connector 20, and the opening portion 24 is a substantially rectangular hole into which the locking portion 12b of the spring portion 12 is fitted.

The opening portion 24 is provided at a position opposite to the locking portion 12b on the upper surface side of the conductive housing 4 when the USB plug connector 20 is fitted to the USB standard reference socket connector 2. Further, although not shown in FIG. 4, two opening portions 24 are provided on the bottom surface of the plug housing 22, and the opening portion 24 is provided at a position where the USB plug connector 20 is fitted to the USB standard reference socket. In the case of the device 2, it faces the lock portion 12b on the bottom surface side of the conductive outer casing 4.

Next, a case where the USB plug connector 20 is fitted to the USB standard reference socket connector 2 will be described. When the USB plug connector 20 is inserted into the USB standard reference socket connector 2, the outer wall surface of the plug housing 22 is inserted along the inner wall surface of the conductive housing 4, thereby becoming the USB plug connector 20 fitted to the USB specification. The state of the reference socket connector 2.

In this case, the locking portion 12b of each spring portion 12 protrudes to the inner space side of the conductive outer casing 4, so that the two locking portions 12b on the upper surface side of the conductive outer casing 4 are fitted to the upper surface side of the plug housing 22 The opening portion 24 and the two locking portions 12b on the bottom surface side of the conductive outer casing 4 are fitted into the two opening portions 24 on the bottom surface side of the plug housing 22. Thereby, the lock portion 12b is in a state of being held in the direction in which the plug housing 22 is prevented from coming off.

Here, since the spring portion 12 has a shape that is bent outward from the side of the locking portion 12b toward the root portion 12a toward the pitch direction, the torsional force is increased as compared with the shape in which the locking portion extends linearly from the side toward the root portion. The upper surface and the bottom surface of the plug housing 22 can be more strongly pressed to stably hold the USB plug connector 20 fitted to the USB standard reference socket connector 2.

Further, since the front end portion of the electric grounding spring 14 protrudes to the inner space side of the conductive outer casing 4, when the USB plug connector 20 is fitted to the USB standard reference receptacle connector 2, the upper surface side of the conductive outer casing 4 The two electrical ground springs 14 are in contact with the upper surface of the plug housing 22, and the two electrical ground springs 14 on the bottom surface side of the conductive housing 4 are in contact with the bottom surface of the plug housing 22. Further, the two electrical ground springs 16 are in contact with the side surface of the plug housing 22 because the front end portion projects to the inner space side of the conductive outer casing 4.

Therefore, the conductive outer casing 4 is in contact with the plug housing 22 at six points of the electrical grounding spring 14 and the electrical grounding spring 16, and the electrical grounding spring 14 is provided on each of the upper surface and the bottom surface. The grounding spring 16 is provided on both sides There is one. That is, not only the two sides of the conductive housing 4 but also the upper surface and the bottom surface are provided with two electrical ground springs 14, thereby increasing the grounding point with the plug housing 22, thereby suppressing the high-speed communication signal. The generation of electromagnetic noise.

According to the USB standard reference socket connector 2 of the above-described embodiment, the spring portion 12 has a shape that is bent outward from the side of the locking portion 12b toward the root portion 12a toward the pitch direction, thereby increasing the torsion force of the spring reaction force and pressing it more strongly. Since the upper surface and the bottom surface of the plug housing 22 are stably held by the USB plug connector 20 of the USB standard reference socket connector 2.

When the USB standard reference socket connector 2 is attached to a terminal device such as a computer, the USB standard reference socket connector 2 is transported by air suction using a suction nozzle or the like. Therefore, the spring portion 12 is flexed to secure an electrical ground spring forming region between the root portions 12a, and an electrical ground spring 14 is formed in the above region, whereby the rear end portion of the conductive outer casing 4 is further closer to the spring portion 12. The position of the side ensures an area for adsorbing the adsorption nozzle, thereby maintaining operability in the mounting operation.

Further, the electrical grounding spring 14 is disposed at a symmetrical position with respect to the upper center surface 30 of the conductive outer casing 4 and the outer casing center line 30, whereby the electrical ground spring 14 is symmetrical with respect to the upper surface of the plug housing 22. And the bottom surface is pressed. Therefore, the holding of the USB plug connector 20 fitted in the USB standard reference socket connector 2 can be more stably stabilized.

Further, in the above embodiment, the case where two electrical ground springs 14 are formed on the upper surface and the bottom surface of the conductive outer casing 4 will be described as an example. However, three electrical grounds may be formed for each. Spring 14. In this case, 2 electrical properties The ground spring 14 is formed in a symmetrical position with respect to the housing center line 30, and another electrical ground spring 14 is formed on the housing center line 30. Further, four or more electrical ground springs 14 may be formed on the upper surface and the bottom surface, respectively.

Further, in the above-described embodiment, the case where the electrical grounding spring 14 is formed between the root portions 12a will be described as an example. However, the present invention is not limited thereto, and as shown in FIG. Further, 12b is formed by one or more electrical ground springs 14 in the region 50 on the side surface side in the pitch direction of the conductive outer casing 4. In this case, the electrical ground spring 14 may be formed only in the region 50, or the electrical ground spring 14 may be formed between the root portions 12a and the region 50, respectively.

Further, in the above-described embodiment, the case where the spring portion 12 has a shape that is bent outward from the locking portion 12b toward the root portion 12a in the pitch direction will be described as an example. However, the present invention is not limited thereto, and as shown in FIG. The portion 12 may have a shape in which the locking portion 12b is bent toward the inner side of the root portion 12a in the pitch direction (the center side in the pitch direction of the conductive outer casing 4). In this case, the spring portion 12 has a shape in which the position of the center point of the width in the pitch direction of the spring portion 12 at the intermediate position in the fitting direction of the root portion 12a and the lock portion 12b is compared with the pitch of the root portion 12a. A line connecting the center point of the width of the direction and the center point of the width of the locking portion 12b in the pitch direction is disposed at a position farther from the center line 44, and is flexed from the locking portion 12b toward the root portion 12a toward the inner side in the pitch direction. The center line 44 passes through the center point of the conductive housing 4 in the pitch direction and is parallel to the fitting direction.

Further, as shown in FIG. 6, when the spring portion 12 is bent toward the inner side in the pitch direction from the locking portion 12b toward the root portion 12a, the relationship between the root portion 12a and the locking portion 12b is The center point of the width of the root portion 12a in the pitch direction is disposed closer to the center line 44 of the conductive housing 4 than the center point of the width of the locking portion 12b in the pitch direction. Further, a line passing through the center point in the pitch direction of the root portion 12a and parallel to the fitting direction is located at a position inside the pitch direction from a position in the pitch direction of the lock portion 12b.

Further, as shown in FIG. 6, when the spring portion 12 is bent toward the inner side in the pitch direction from the locking portion 12b toward the root portion 12a, the electrical grounding spring 14 may be between the two locking portions 12b, that is, in the conductive housing 4. One or more regions 60 are formed between the center line 44 and the lock portion 12b, and one or more regions 62 on the side surface side in the pitch direction of the conductive outer casing 4 may be formed in each of the root portions 12a.

2‧‧‧USB specification reference socket connector

4‧‧‧Electrically conductive housing

6‧‧‧weld claws

10‧‧‧Mate

12‧‧‧Spring Department

12a‧‧‧ Root

12b‧‧‧Locking Department

14, 16‧‧‧Electrical grounding spring

Claims (9)

A USB standard reference socket connector capable of fitting or unplugging a USB plug connector in a fitting direction based on a USB specification, the USB plug connector comprising: a first connector; a first insulating material holding the first connector And a plug housing covering the first joint and the first insulating material and forming a first fitting portion; the USB standard reference socket connector including: a second joint; and a second insulating material holding the second joint And a casing that covers the second joint and the second insulating material, and is provided with a lock portion, an electrical connection portion, and the first fitting portion that are held in a direction in which the plug housing is prevented from being fitted and detached The second fitting portion that is fitted to the USB standard reference socket connector is characterized in that the locking portion is provided in the vicinity of the front end portion of the spring portion extending in the fitting direction, and the root portion of the spring portion is on the second joint The relationship between the center point of the width in the arrangement pitch direction and the center point of the width of the lock portion in the pitch direction is such that the center point of the root portion is arranged closer to the center point of the lock portion On the centerline of the width of the pitch direction further away from or closer to the housing. The USB standard reference socket connector according to the first aspect of the invention, wherein the center point of the width of the root portion of the spring portion in the pitch direction and the center line parallel to the fitting direction are located in the lock portion Outside the range of the width of the pitch direction. A USB standard reference socket connector as described in claim 1 or 2, wherein The center point of the width of the spring portion in the pitch direction at the intermediate position of the locking portion and the root portion of the spring portion in the fitting direction is larger than the center point of the width of the locking portion in the pitch direction A line connecting the center points of the widths of the root portions of the spring portion in the pitch direction is disposed at a position closer to a center line of the width of the outer casing in the pitch direction. The USB standard reference socket connector according to any one of claims 1 to 3, wherein a 1 is formed between a root of the spring portion and a center line of the width of the outer casing in the pitch direction. More than one of the electrical connecting portions electrically connected to the plug housing. The USB standard reference socket connector according to any one of the first to third aspects of the present invention, wherein a portion of the side of the spring portion closer to the side of the pitch direction of the outer casing is formed. More than one of the electrical connecting portions electrically connected to the plug housing. The USB standard reference socket connector according to any one of the first to third aspects of the present invention, wherein the locking portion is formed at one or more positions on a side surface side of the outer casing in the pitch direction. The electrical connection portion electrically connected to the plug housing. The USB standard reference socket connector according to any one of the first aspect, wherein the locking portion and the center line of the width of the outer casing in the pitch direction are formed one or more. The electrical connection portion electrically connected to the plug housing. The USB specification as described in any one of claims 1 to 3 a reference socket connector in which a position between a root portion of the spring portion and a width of the outer casing in the pitch direction and a side surface side of the lock portion closer to the pitch direction of the outer casing are formed One or more electrical connection portions electrically connected to the plug housing. The USB standard reference socket connector according to any one of the first to third aspect, wherein the position of the side surface side of the outer casing in the pitch direction is higher than the root portion of the spring portion, and One or more electrical connection portions electrically connected to the plug housing are formed between the locking portion and a center line of the width of the outer casing in the pitch direction.