JP7410873B2 - electronic unit - Google Patents

Description

The present invention relates to an electronic unit.

Patent Document 1 discloses an electronic unit configured as a lamp ECU including an LED drive circuit for causing an LED to emit light. The electronic unit includes a casing that includes a case body with an open top and a cover attached to the opening of the case body, and an electronic structure and a heat diffusion sheet that are housed in the casing.

Japanese Patent Application Publication No. 2014-82147

In an electronic unit such as that disclosed in Patent Document 1, contact pins are mounted perpendicularly to the mounting surface of an electronic assembly (electronic component) to form an internal connector, and an external connector is connected to the internal connector. May make electrical connections to the unit. At this time, the pressing force of the external connector is transmitted to the internal connector, which may cause distortion of the electronic component where the contact pins are mounted, which may adversely affect various circuit elements mounted on the electronic component. Furthermore, since there is a possibility that the surface of the electronic component, particularly the surface on which the contact pins are mounted, may be distorted, it is difficult to mount a circuit element on the back surface of the surface on which the contact pins are mounted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electronic unit that can suppress distortion of electronic components when connecting connectors.

In order to achieve the above object, an electronic unit according to one aspect of the present invention includes:
electronic parts and
a first connector having a plurality of contact pins, one end of which is mounted on the surface of the electronic component and the other end of which is erected perpendicularly to the surface;
a casing that accommodates the electronic component and the first connector;
a connector housing capable of accommodating a second connector having a hole through which the other end of the contact pin can be inserted;
An electronic unit comprising:
the connector housing is supported by the casing;
The connector housing has a pressure receiving portion that receives a vertical pressing force against the surface by the second connector when the first connector and the second connector are engaged with each other.

According to the above configuration, since the connector housing supported by the casing is provided with the pressure receiving portion that receives the pressing force of the second connector, the pressing force of the second connector is not directly transmitted to the first connector. Therefore, the pressing force of the second connector is not transmitted to the electronic component on which the contact pin of the first connector is mounted, and the electronic component is not distorted when the second connector is connected to the first connector. Therefore, there is no adverse effect on circuit elements mounted near the surface on which the contact pins are mounted. In addition, circuit elements can be suitably mounted on the back surface of the portion of the electronic component where the contact pins are mounted.

Further, in the electronic unit of the present invention,
The pressure receiving part extends in a direction parallel to an extending direction of the surface of the electronic component,
In a state where the first connector and the second connector are connected, a distal end portion of the second connector may be brought into contact with the pressure receiving portion.

According to the above configuration, the pressure receiving portion can reliably receive the pressing force of the second connector along the direction perpendicular to the mounting surface of the electronic component.

Further, in the electronic unit of the present invention,
The connector housing may be integrally molded with the casing.

According to the above configuration, the connector housing can be supported by the casing with a simple configuration.

Further, in the electronic unit of the present invention,
The connector housing may be formed separately from the casing, and may be fitted into the casing.

According to the above configuration, the connector housing can be supported by the casing with a simple configuration.

Further, in the electronic unit of the present invention,
The casing is
The main body and
an inner cover that is housed inside the main body and covers the surface of the electronic component;
including;
The connector housing may be fitted into the inner cover.

According to the above configuration, the connector housing can be supported by the casing with a simple configuration.

Further, in the electronic unit of the present invention,
the connector housing includes an opening through which the first connector is inserted;
The first connector may include a guide surface for positioning with respect to the opening.

According to the above configuration, the first connector and the connector housing can be easily positioned, and the positional accuracy between the first connector and the connector housing can be relaxed.

According to the present invention, it is possible to provide an electronic unit that can suppress distortion of electronic components during connector connection.

1 is a schematic cross-sectional view showing an example in which the present invention is applied to a headlamp of an automobile. FIG. 1 is a perspective view showing an electronic unit of the present invention. 3 is a plan view of the electronic unit shown in FIG. 2. FIG. 3 is an exploded perspective view of the electronic unit shown in FIG. 2. FIG. FIG. 3 is a perspective view showing the inside of the main body of the casing together with electronic components. It is a perspective view showing a first connector. FIG. 4 is a partial cross-sectional view taken along the line AA in FIG. 3 for explaining the assembly of the first connector and the connector housing. FIG. 7 is a sectional view showing a modification of the electronic unit. FIG. 7 is a perspective view showing a modification of the connector housing. 10 is a cross-sectional view of the connector housing of FIG. 9 fitted into a casing; FIG.

Embodiments of the present invention will be described below with reference to the drawings. Note that for the sake of convenience, the description of members having the same reference numbers as those already described in the description of this embodiment will be omitted. Further, the dimensions of each member shown in this drawing may differ from the actual dimensions of each member for convenience of explanation.

In addition, in the description of this embodiment, for convenience of explanation, "left-right direction", "front-back direction", and "up-down direction" will be referred to as appropriate. These directions are relative directions established for the headlamp shown in FIG. Here, the "vertical direction" is a direction including "upward direction" and "downward direction." "Anteroposterior direction" is a direction including "front direction" and "rear direction". "Left-right direction" is a direction including "left direction" and "right direction."

FIG. 1 is a cross-sectional view showing an automobile headlamp 100 including an electronic unit 1 according to the present embodiment.
As shown in FIG. 1, a lamp housing 101 of a headlamp 100 is composed of a lamp body 102 and a front cover 103. Inside the lamp housing 101, a light source unit 110 is provided together with an extension 104. Further, as a lighting control unit that controls the lighting state of the light source (LED 112) mounted on the light source unit 110, the electronic unit 1 is attached to the outside of the lamp housing 101, for example, to the outer bottom surface of the lamp body 102. Electronic unit 1 is electrically connected to light source unit 110 via harness HA.

The light source unit 110 is a so-called projector type lamp unit. The light source unit 110 includes a unit base 111 and an LED 112 provided on the unit base 111 as a light source. The light source unit 110 further includes a reflector 113 provided to cover the LED 112 and a projection lens 114 placed in front of the LED 112. The light emitted from the LED 112 and reflected by the reflector 113 and the direct light from the LED 112 are irradiated forward by the projection lens 114 while being partially blocked by a shade 115 formed on the unit base 111. . Thereby, the light source unit 110 realizes light irradiation according to a required light distribution pattern.

FIG. 2 is a perspective view of the electronic unit 1 observed diagonally from above. FIG. 3 is a plan view of the electronic unit 1 observed from above. FIG. 4 is an exploded perspective view of the electronic unit 1 shown in FIGS. 2 and 3.
The electronic unit 1 is configured as a lamp ECU (Electronic Control Unit) including an LED drive circuit for supplying power to the light source unit 110 and causing the LED 112 to emit light. As shown in FIGS. 2 to 4, the electronic unit 1 includes a casing 10 composed of a main body 2 and an inner cover 3, an electronic component 4, a connector 5 (hereinafter referred to as a first connector 5), It includes a connector housing 6 and an external cover 7.

The main body portion 2 is made of resin, for example, and is formed into a substantially rectangular box shape with an open bottom. The inner cover 3, the electronic component 4, and the first connector 5 are accommodated inside the main body part 2 through the opening 21 at the lower part. A cylindrical opening 22 for opening the inside of the main body 2 is provided in the upper wall 23 of the main body 2 . A connector section 24 is provided at the rear of the main body section 2 for electrical connection to an external power source such as an on-board battery or a vehicle ECU that controls the entire vehicle. The main body portion 2 may be made of resin such as polybutylene terephthalate or polyphenylene sulfite containing glass powder, in order to ensure the required mechanical strength. Note that the main body portion 2 may be made of metal.

The electronic component (electronic circuit board) 4 includes a wiring board 41, a plurality of semiconductor elements 42 mounted on the wiring board 41, and the like. The semiconductor element 42 and the like mounted on the wiring board 41 are components of the lamp ECU.

The first connector 5 is provided on the wiring board 41 of the electronic component 4. The first connector 5 has a plurality of contact pins 51. One end 51a of each contact pin 51 is mounted on the surface of the wiring board 41. Further, an end portion 51b of each contact pin 51 opposite to the end portion 51a is erected perpendicularly to the surface of the wiring board 41.

The connector housing 6 is a housing that can accommodate the end portion 51b of the contact pin 51 and also accommodate a connector (female connector, hereinafter referred to as a second connector) connectable to the first connector 5. The connector housing 6 has an upper opening 61 into which the second connector is inserted (see FIG. 2). The connector housing 6 also has a lower opening 62 into which the first connector 5 is inserted (see FIG. 5). The connector housing 6 is configured to guide a second connector inserted into the connector housing 6 to the first connector 5.

The connector housing 6 is supported by the main body portion 2 of the casing 10. For example, the connector housing 6 is made of resin like the main body 2, and is supported by the main body 2 by being integrally molded with the upper wall 23 of the main body 2. A connector housing 6 integrally molded with the main body 2 is disposed within the cylindrical opening 22 of the main body 2 . The connector housing 6 within the cylindrical opening 22 is provided with the upper opening 61 exposed upward.

The inner cover 3 constituting the casing 10 is arranged above the electronic component 4 so as to cover the surface of the electronic component 4. The inner cover 3 includes a flat part 31 that extends to cover the mounting surface of the electronic component 4, a bent part 32 that bends downward from the flat part 31, and an extended part that extends downward from the bent part 32. 33, and a mounting portion 34 that is attached to the main body portion 2 together with the electronic component 4.

An opening 35 is formed in the flat portion 31 . The opening 35 is formed at a position corresponding to the cylindrical opening 22 of the main body 2 when the inner cover 3 is housed in the main body 2 . Further, the opening 35 is formed at a position corresponding to the first connector 5 attached to the wiring board 41 of the electronic component 4 when the internal cover 3 is arranged to cover the electronic component 4. Therefore, when the internal cover 3 and the electronic component 4 are housed in the main body 2, the first connector 5 inserted into the opening 35 is inserted into the connector housing 6 provided in the cylindrical opening 22 of the main body 2. It is configured to be located in The internal cover 3 and the electronic component 4 housed in the main body 2 are fixed to the main body 2 with screws 11 via attachment parts 34 .

The inner cover 3 is made of metal with high electrical conductivity and high thermal conductivity. The internal cover 3 is screwed together with the electronic component 4 to the main body 2 and is electrically connected to the ground portion of the electronic component 4 via the attachment portion 34 .

The external cover 7 includes a bottom plate part 71 having a substantially rectangular shape, a side wall part 72 provided on each side of the bottom plate part 71, and an inner wall part 73 provided inside the side wall part 72 along each side wall part 72. have.

The side wall portion 72 is formed at the outer edge of the outer cover 7 so as to protrude upward from the bottom plate portion 71 in the direction of assembly with the main body portion 2 . The inner wall portion 73 is formed inside the side wall portion 72 so as to protrude upward from the bottom plate portion 71 similarly to the side wall portion 72 . A groove 74 is formed between the side wall portion 72 and the inner wall portion 73. The groove 74 is filled with an adhesive (not shown). An insulating material 12 is provided between the outer cover 7 and the electronic component 4 and is bonded to the bottom plate portion 71 of the outer cover 7 to ensure insulation between the electronic component 4 and the outer cover 7 .

The outer cover 7 is made of metal with high electrical conductivity and high thermal conductivity. The external cover 7 is assembled to the lower side of the main body 2 so as to cover the opening 21 of the main body 2. The external cover 7 is assembled to the main body 2 by, for example, mounting holes 76 provided in the left and right side walls 72 engaging with protrusions 26 provided in the side walls 25 of the main body 2. When the outer cover 7 is assembled to the main body 2 , the tip 25 a of the side wall 25 of the main body 2 fits into the groove 74 of the outer cover 7 . As a result, the tip 25a of the side wall 25 comes into contact with the adhesive filled in the groove 74, and the side wall 25 of the main body 2 and the outer cover 7 are bonded together with the adhesive. Note that the method of bonding the main body portion 2 and the external cover 7 is not limited to bonding using an adhesive filled in the groove 74. For example, adhesive or elastic packing or the like formed in a shape corresponding to the shape of the groove 74 (approximately rectangular shape) may be placed in the groove 74.

FIG. 5 is a perspective view of the inside of the main body portion 2 of the casing 10 observed from the lower right side. FIG. 5 also shows the electronic component 4 housed in the main body 2. As shown in FIG. FIG. 6 is a perspective view of the first connector 5 viewed from the upper left. FIG. 7 is a partial cross-sectional view taken along the line AA in FIG. 3 for explaining the assembled state of the first connector 5 and the connector housing 6. Note that FIG. 7 also shows a second connector 120 that is engaged with the first connector 5.

As shown in FIG. 5, a lower opening 62 is provided at the lower end of the connector housing 6, which is integrally molded with the upper wall 23 of the main body 2. The lower opening 62 communicates with the above-described upper opening 61 of the connector housing 6 via a communication path formed inside the connector housing 6. When the electronic component 4 is housed in the main body 2, the end 51b of the contact pin 51 of the first connector 5 attached to the wiring board 41 of the electronic component 4 is inserted into the lower opening 62. . Note that, in FIG. 5, illustration of the internal cover 3 accommodated in the main body portion 2 together with the electronic component 4 is omitted.

As shown in FIG. 6, the first connector 5 further includes a base portion 52 to which a plurality of contact pins 51 are attached. On a pin mounting surface 52a provided at the center of the base portion 52, an end portion 51b of the contact pin 51 is vertically erected when viewed from the front. In this example, the end portions 51b are arranged in two rows in the front-rear direction. Further, in the lower part of the base portion 52, end portions 51a of the contact pins 51 are provided in parallel so as to extend laterally from the lower end of each end portion 51b. The first connector 5 is attached to the wiring board 41 by fixing the base portion 52 to the wiring board 41 and by mounting the ends 51a of the contact pins 51 on the surface of the wiring board 41.

As shown in FIG. 7, the second connector 120 has a plurality of holes 121 through which the ends 51b of the plurality of contact pins 51 can be inserted. When the electronic component 4 is attached to the main body 2 together with the inner cover 3, the first connector 5 attached to the wiring board 41 inserts contact pins into the lower opening 62 of the connector housing 6, which is integrally molded with the main body 2. The end portion 51b of 51 is inserted and fixed. In this state, when the second connector 120 is inserted from the upper opening 61 of the connector housing 6, the second connector 120 is guided to the communication path within the connector housing 6. Then, the second connector 120 engages with the first connector 5 by inserting the end portions 51b of each contact pin 51 of the first connector 5 into each hole 121 formed in the second connector 120.

The connector housing 6 has a pressure receiving part 63 against which the tip end 122 of the second connector 120 comes into contact when the second connector 120 is engaged with the first connector 5 . The pressure receiving part 63 is provided along the edge of the lower opening 62. The surface forming the pressure receiving part 63 is provided, for example, so as to be parallel to the direction in which the surface of the wiring board 41 extends. Thereby, the pressure receiving portion 63 is configured to receive a vertical pressing force applied from the second connector 120 toward the first connector 5 when the first connector 5 and the second connector 120 are engaged. In the connector housing 6, when the electronic component 4 is fixed to the main body part 2, the height of the receiving surface of the pressure receiving part 63 (height at the position indicated by the broken line 63a) is higher than the base part 52 of the first connector 5. The pin mounting surface 52a is arranged at a higher position (an upper position) than the height of the pin mounting surface 52a.

The first connector 5 has a guide surface 53 for positioning with respect to the lower opening 62 of the connector housing 6. The guide surfaces 53 are formed on the front, rear, left and right outer sides of the pin mounting surface 52a of the base portion 52. The guide surface 53 is formed, for example, by a slope that slopes downward toward the outside. Further, the first connector 5 has an outer upper surface 52b that is one level lower than the pin mounting surface 52a on the front, rear, left, and right outer sides of the guide surface 53 in the base portion 52.

The first connector 5 is arranged such that the height of the outer upper surface 52b is lower than the height of the bottom surface 64 of the connector housing 6 (lower position) when the electronic component 4 is fixed to the main body 2. It is configured. Further, in the first connector 5, the height of the pin mounting surface 52a is arranged at a higher position (upper position) than the height of the bottom surface 64 of the connector housing 6 when the electronic component 4 is fixed to the main body part 2. It is configured to Therefore, when the electronic component 4 is fixed to the main body 2, the first connector 5 is guided by the guide surface 53, and the pin mounting surface 52a is positioned at an appropriate position relative to the lower opening 62 of the connector housing 6. be done. That is, the first connector 5 is properly positioned with respect to the connector housing 6 by the guide surface 53. The first connector 5 is configured such that the pin mounting surface 52a of the base portion 52 does not come into contact with the connector housing 6 when the electronic component 4 is fixed to the main body portion 2.

The electronic unit 1 having such a configuration is attached to the outer bottom surface of the lamp housing 101 and communicated with the interior of the lamp housing 101 via the cylindrical opening 22 of the main body 2 (see FIG. 1). The first connector 5 housed within the main body 2 is connected to a harness HA electrically connected to the light source unit 110. Specifically, the electronic unit 1 side of the harness HA is attached to the second connector 120 (see FIG. 7), and the harness HA is connected to the first connector 5 within the connector housing 6 via the second connector 120. Connected. Further, a connector section 24 provided at the rear of the main body section 2 is connected to a harness HB (see FIG. 1) that is electrically connected to an external power source and a vehicle ECU.

As described above, the electronic unit 1 according to the present embodiment includes the electronic component 4, one end portion 51a is mounted on the surface of the wiring board 41 of the electronic component 4, and the other end portion 51b is mounted on the surface of the wiring board 41. The first connector 5 has a plurality of contact pins 51 vertically erected, and the casing 10 houses the electronic component 4 and the first connector 5. The electronic unit 1 further includes a connector housing 6 capable of accommodating a second connector 120 having a hole 121 through which the other end 51b of the contact pin 51 can be inserted. The connector housing 6 is integrally molded with the main body portion 2 that constitutes a part of the casing 10. The connector housing 6 supported by the main body part 2 by integral molding is provided with a pressure receiving part 63 that receives the pressing force of the second connector 120 engaged with the first connector 5. Therefore, when the second connector 120 is engaged with the first connector 5, the pressing force of the second connector 120 is not directly transmitted to the first connector 5. Therefore, the pressing force of the second connector 120 is not transmitted to the electronic component 4 on which the contact pin 51 of the first connector 5 is mounted, and when the second connector 120 is engaged with the first connector 5, the electronic component 4 is not distorted. Therefore, in the electronic component 4, there is no adverse effect on circuit elements mounted near the portion where the contact pin 51 is mounted. Thereby, in the electronic component 4, the circuit element can also be mounted on the back side of the part where the contact pin 51 is mounted.

Further, according to the electronic unit 1, the pressure receiving portion 63 that receives the pressing force of the second connector 120 extends in a direction parallel to the direction in which the surface of the electronic component 4 extends. Therefore, when the first connector 5 and the second connector 120 are connected, the pressure receiving portion 63 can reliably receive the pressing force of the second connector 120 along the direction perpendicular to the mounting surface of the electronic component 4. I can do it.

Further, according to the electronic unit 1, the connector housing 6 can be supported by the casing 10 with a simple structure in which the connector housing 6 is integrally molded with the casing 10.

Further, according to the electronic unit 1, the first connector 5 includes a guide surface 53 for positioning with respect to the lower opening 62 of the connector housing 6. Therefore, the first connector 5 and the connector housing 6 can be easily positioned, and the positional accuracy between the first connector 5 and the connector housing 6 can be relaxed.

Note that the present invention is not limited to the embodiments described above, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, numerical value, form, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as the present invention can be achieved.

Although the above embodiment describes the case where the connector housing 6 is integrally molded on the upper wall 23 of the main body portion 2, the present invention is not limited to this example. For example, as shown in FIG. 8, the connector housing 206 may be integrally molded with, for example, a flat portion 31 of the inner cover 3 housed within the main body portion 2. In this case, both the connector housing 206 and the inner cover 3 may be made of resin material, or both may be made of metal. Even when the connector housing 206 is integrally molded with the flat part 31 of the inner cover 3, the pressing force of the second connector 120 when the second connector 120 inserted from the upper opening 261 is engaged with the first connector 5 can be reduced. The pressure can be received by the pressure receiving part 263 of the connector housing 206, and an adverse effect on the electronic component 4 can be suppressed.

FIG. 9 is a perspective view showing a connector housing 106 according to a modified example. FIG. 10 is a partial cross-sectional view showing the connector housing 106 attached to the upper wall 23 of the main body 2. As shown in FIG.
The connector housing 6 in the embodiment described above is integrally molded with the main body portion 2 of the casing 10. On the other hand, the connector housing 106 in the modified example shown in FIG. 9 is formed as an independent member separate from the main body 2 and is configured to be attached to the main body 2.

As shown in FIG. 9, the connector housing 106 has side walls 174a to 174d. Each side wall 174a to 174d is provided with a plurality of protrusions 173 for fitting the connector housing 106 into the main body 2. The connector housing 106 is fitted into the upper wall 23 (see FIG. 2) of the main body portion 2. The protrusion 173 has an upper protrusion 173a provided in parallel on the upper side and a lower protrusion 173b provided in parallel on the lower side on each of the side walls 174a to 174d.

The upper protrusion 173a is formed to have a slope that slopes upward toward the side wall. The lower protrusion 173b is formed to have a slope that slopes downward toward the side wall. The distance D between the upper protrusion 173a and the lower protrusion 173b in the vertical direction is set to be approximately the same as the thickness of the upper wall 23 of the main body 2. The connector housing 106 is attached to the main body 2 by fitting the upper wall 23 of the main body 2 into the distance D between the upper protrusion 173a and the lower protrusion 173b. Note that the other configurations of the connector housing 106 are similar to the configuration of the connector housing 6. That is, an upper opening 161 through which the second connector is inserted is formed at the upper end of the connector housing 106, and an end 51b of the contact pin 51 of the first connector 5 is inserted through the lower end of the connector housing 106. A lower opening 162 is formed. Further, a pressure receiving portion 163 is provided along the edge of the lower opening 162.

As shown in FIG. 10, the connector housing 106 is fitted to the upper wall 23 of the main body 2 via, for example, an upper protrusion 173a and a lower protrusion 173b provided on a side wall 174b. The second connector 120 is inserted into the connector housing 106 fitted to the upper wall 23 of the main body part 2 through the upper opening 161 of the connector housing 106, similarly to the above embodiment. When the second connector 120 is inserted into the connector housing 106 , the tip 122 of the second connector 120 comes into contact with the pressure receiving part 163 of the connector housing 106 . Thereby, the vertical pressing force applied from the second connector 120 is received by the pressure receiving portion 163.

According to the configuration according to this modification, the connector housing 106 can be easily supported by the casing 10 by fitting the connector housing 106 formed separately from the casing 10 into the main body 2 of the casing 10. can. Moreover, this configuration also prevents the electronic component 4 from being distorted when the second connector 120 is engaged with the first connector 5.

In addition, although the case where the connector housing 106 was fitted into the upper wall 23 of the main body part 2 was demonstrated in the said modification, it is not limited to this example. For example, the connector housing 106 may be fitted into the inner cover 3 housed within the main body portion 2 .

This application is based on Japanese Patent Application No. 2018-216274 filed on November 19, 2018, the contents of which are incorporated herein by reference.

Claims (5)

electronic parts and
a first connector having a plurality of contact pins, one end of which is mounted on the surface of the electronic component and the other end of which is erected perpendicularly to the surface;
a casing that accommodates the electronic component and the first connector;
a connector housing capable of accommodating a second connector having a hole through which the other end of the contact pin can be inserted;
An electronic unit comprising:
the connector housing is supported by the casing;
The connector housing includes a pressure receiving portion that receives a vertical pressing force from the second connector against the surface when the first connector and the second connector are engaged , and an opening through which the first connector is inserted. and has
The first connector includes a mounting surface on which the plurality of contact pins are mounted, a guide surface for positioning with respect to the opening, and a guide surface provided around the mounting surface one step lower than the mounting surface. an outer top surface ;
When the electronic component is fixed to the casing, a gap is provided between the pressure receiving part and the mounting surface, and the mounting surface is configured not to contact the pressure receiving part ,
In the electronic unit , the guide surface is an inclined surface provided between the mounting surface and the outer upper surface . The pressure receiving part extends in a direction parallel to an extending direction of the surface of the electronic component,
The electronic unit according to claim 1, wherein a distal end portion of the second connector is brought into contact with the pressure receiving portion in a state where the first connector and the second connector are connected. The electronic unit according to claim 1 or 2, wherein the connector housing is integrally molded with the casing. The electronic unit according to claim 1 or 2, wherein the connector housing is formed separately from the casing and is fitted into the casing. The casing is
The main body and
an inner cover that is housed inside the main body and covers the surface of the electronic component;
including;
The electronic unit according to claim 4, wherein the connector housing is fitted to the inner cover.

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