KR101593093B1

KR101593093B1 - Device for measuring pressure

Info

Publication number: KR101593093B1
Application number: KR1020140079755A
Authority: KR
Inventors: 김치연; 박진규; 윤종운; 이슬기; 전성호; 한상현
Original assignee: 주식회사 현대케피코
Priority date: 2014-06-27
Filing date: 2014-06-27
Publication date: 2016-02-18
Also published as: KR20160001364A

Abstract

The present invention relates to a pressure measuring apparatus, and more particularly, to a pressure measuring apparatus capable of measuring a pressure of a flowing fluid.
The pressure measuring device of the present invention includes a first housing formed of a metal and configured such that a suction hole through which a fluid flows is exposed from the bottom to the outside, a second housing coupled to the first housing and configured to detect a pressure of the fluid flowing through the suction hole A second housing which is seated on an upper surface of the first housing and is connected to the detecting element, a second housing coupled to an upper portion of the first housing to conceal the detecting element and the circuit board, And a grounding member disposed between the first housing and the second housing and grounding the circuit board to the first housing, wherein the grounding member is fixed to the lower surface of the second housing, A coupling portion that is in contact with an upper surface of the first housing when the second housing is assembled, and a coupling portion that is connected to the coupling portion and is disposed between the lower surface of the second housing and the upper surface of the circuit board As the first elastic compression during the assembly of the second housing and the first housing comprises an elastic portion which is in close contact with the upper surface of the circuit board.

Description

{DEVICE FOR MEASURING PRESSURE}

The present invention relates to a pressure measuring apparatus, and more particularly, to a pressure measuring apparatus capable of measuring a pressure of a flowing fluid.

As is widely known, a pressure measuring device, i.e., a pressure sensor, is a kind of measuring instrument used for measuring various pressures.

BACKGROUND ART A pressure sensor is mainly used in a vehicle, a chemical facility, a semiconductor manufacturing facility, or the like for measuring the pressure of a fluid installed on a flow path or a valve side of a fluid. For example, Hydrogen gas or air pressure, exhaust gas pressure in a silencer, and other general industrial pressure gauges from a low pressure to a high pressure.

Such a pressure sensor is constituted by a pressure element provided with a pressure to which the fluid is introduced, which is close to the inlet and the pressure guiding inlet, and the pressure element can be composed of various elements such as a semiconductor chip or a strain gauge.

Korean Patent Laid-Open Publication No. 10-2005-0014871, Korean Patent Laid-Open Publication No. 10-2013-0037066, and the like.

Such a pressure measuring apparatus is also called a high pressure sensor or a pressure sensor and includes a detecting element for detecting a pressure of a flowing fluid, a terminal for transmitting a signal generated from the detecting element to the outside, A circuit board connected to the detecting element, a grounding member for grounding the circuit board, and the like.

Here, the conventional pressure measuring apparatus has a complicated structure between the circuit board, the ground member, and the housing.

Therefore, it is difficult to assemble the circuit board with the grounding member and the housing, and when the pressure measuring device is impacted by an external force, mutual contact portions of the grounding member and the circuit board may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pressure measuring device capable of strengthening the assembly and internal structure and facilitating the assembly of the pressure measuring device.

According to another aspect of the present invention, there is provided a pressure measuring apparatus comprising: a first housing formed of metal and configured such that a suction hole through which a fluid flows is exposed from the bottom to the outside; a first housing coupled to the first housing, A second housing which is seated on the upper surface of the first housing and is connected to the detecting element, and which is coupled to an upper portion of the first housing to conceal the detecting element and the circuit board, And a grounding member made of metal and disposed between the first housing and the second housing to ground the circuit board to the first housing, A coupling portion fixed to the first housing and abutting the upper surface of the first housing when the first housing and the second housing are assembled, And an elastic portion disposed between the upper surface of the circuit board and the upper surface of the circuit board and being elastically compressed when the first housing and the second housing are assembled,

A coupling protrusion protrudes downward from a lower surface of the second housing, and the coupling portion is elastically contacted to the coupling protrusion.

The fixing protrusions are spaced from each other by a distance slightly narrower than the width of the engaging portion. The fixing protrusions are formed by a pair of the fixing protrusions The engaging portion is inserted and arranged.

Wherein the engaging portion includes a first extending portion elastically contacted with one surface of the engaging projection in an outward direction of the first housing so as to be elastically contacted with the first engaging projection in a vertical direction and one end connected to the lower end of the first extending portion, And the other end of which is bent in the direction of the second housing to be in contact with the other surface of the engaging projection in the inner direction of the first housing, And a second extension portion elastically contacted with the first extension portion in a vertical direction.

A support wall is formed on a lower surface of the second housing at a position spaced apart from the coupling protrusion in an outward direction of the first housing to form a support groove between the coupling protrusion and the support wall, 1 extension part, and the other end is inserted into the support groove, the first bent part is in close contact with the supporting wall, and the first extending part is in close contact with the one surface of the coupling projection do.

A fixing protrusion coupled to the ground portion is formed to protrude downward on a lower surface of the coupling protrusion. The thickness of the ground portion is larger than the height of the fixing protrusion.

The elastic portion includes a third extension portion having one end connected to the coupling portion and the other end bent inward in the first housing, one end connected to the other end of the third extension portion, And the second bent portion is in close contact with the upper surface of the circuit board.

The third extending portion is held in abutment with the lower surface of the second housing and the distance from the third extending portion to the lowermost point of the second bending portion in the free state is a distance from the third extending portion to the upper surface of the circuit board And the elastic portion is elastically compressed by pressing the circuit board at the time of assembling.

According to the present invention, the grounding member disposed between the first housing and the second housing connects the circuit board and the first housing, so that the circuit board can be easily grounded.

In addition, the grounding member can be easily coupled to the lower surface of the second housing by the engaging portion, and when the first housing and the second housing are assembled by the elastic portion, So that the first housing and the second housing can be easily assembled.

A coupling protrusion for coupling the coupling portion is formed on the lower surface of the second housing and the coupling portion is elastically contacted to the coupling protrusion so that the grounding member can be firmly fixed to the lower surface of the second housing.

Wherein the fixing protrusions are made of a pair of mutually spaced apart from each other by a distance slightly narrower than the width of the engaging portion and the engaging portion is inserted between a pair of the fixing protrusions so that the grounding member is easily inserted into the lower surface of the second housing Can be combined.

The first extending portion is elastically brought into close contact with the one surface of the coupling projection in the outer direction of the first housing in the vertical direction and the second extending portion is elastically contacted with the other surface of the coupling projection in the inner direction of the first housing, So that the engaging portion is reliably elastically coupled to the lower surface of the second housing to prevent the grounding member from being separated from the second housing.

When the grounding member is assembled to the second housing, the first bent portion is supported by the support wall so that the first extending portion is elastically contacted with the one surface of the coupling protrusion, so that the grounding member is firmly fixed to the lower surface of the second housing .

The ground portion is formed to be thicker than the fixing protrusion so that the ground portion first comes into contact with the upper surface of the first housing more than the lower surface of the fixing protrusion when the first housing and the second housing are assembled, 1 can be surely brought into close contact with the upper surface of the housing.

The second bent portion is in contact with the upper surface of the circuit board and the third extending portion is protruded in the outer direction of the first housing, But can be mounted differently.

The third extending portion is held in abutting contact with the lower surface of the second housing and the distance from the third extending portion to the lowermost point of the second bent portion in the free state is a distance from the third extending portion to the upper surface of the circuit board And the elastic portion is elastically compressed by the pressing of the circuit board during assembly so that the lowest point of the second bent portion can reliably contact the upper surface of the circuit board.

1 is a perspective view showing a pressure measuring apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line A-A 'shown in FIG.
3 is a cross-sectional view taken along line B-B 'shown in Fig.
FIG. 4 is a process diagram illustrating the assembling process of the portion C shown in FIG.
5 is a plan view showing a pressure measuring apparatus according to the first embodiment of the present invention.
6 is an exploded bottom perspective view of the second housing and the grounding member of the pressure measuring device according to the first embodiment of the present invention.
FIG. 7 is a process diagram illustrating an assembling process of the portion D shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view taken along line A-A 'of FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 FIG. 4 is a process diagram showing a process of assembling part C shown in FIG. 3, and FIG. 5 is a plan view showing a pressure measuring device according to the first embodiment of the present invention.

1 to 5, a pressure measuring apparatus according to the present invention includes a first housing 100, a detecting element 200, a circuit board 300, a second housing 400, a terminal (not shown) 500, an elastic member 600, and a ground member 700.

The first housing 100 is made of metal, and the suction hole 111 through which the fluid flows is exposed from the lower part to the outside, and a plurality of coupling parts 140 protrude upward from the upper part.

The first housing 100 includes a port portion 110, a pedestal 120, and an outer wall.

The port portion 110 is formed in a hollow cylindrical shape, and the suction hole 111 is formed therein, and a fluid, such as air, flowing in the pipe, And can be introduced through the suction hole 111.

A hole is formed in the center of the pedestal 120 so that the upper portion of the port portion 110 is disposed.

Here, the port portion 110 and the pedestal 120 may be integrally manufactured or may be separately manufactured and welded together.

That is, the port portion 110 and the pedestal 120 are formed as separate parts, so that the port portion 110 and the pedestal 120 can be easily coupled to each other.

The outer wall protrudes upward from the upper surface of the pedestal 120 as shown in FIG. 2, and is disposed around the lower portion of the second housing 400.

When the second housing 400 is coupled to the first housing 100, the lower portion of the second housing 400 is inserted into the outer wall.

When the second housing 400 is coupled to the first housing 100, the lower portion of the second housing 400 is guided by the outer wall to be easily coupled to the first housing 100 .

In addition, as shown in Figs. 3 and 4 (a), the fastening part 140 is protruded upward from the upper side of the outer wall.

4 (b), the coupling part 140 is coupled to the second housing 400 (see FIG. 4 (b)) to prevent the second housing 400 from being rotated or separated from the first housing 100. [ ) Direction.

The sensing element 200 is coupled to the upper portion of the first housing 100, more specifically, the port portion 110 to detect the pressure of the fluid introduced through the suction hole 111.

For this, the detecting element 200 is brought into contact with the upper part of the suction hole 111.

The circuit board 300 is mounted on the upper surface of the pedestal 120 and connected to the detecting element 200 through wire bonding or the like.

The circuit board 300 is coupled to the upper surface of the pedestal 120 through an adhesive or the like.

In addition, it is preferable that a gel or the like is applied to the upper part of the detecting element 200 to protect the detecting element 200 from the outside.

The second housing 400 is coupled to the upper portion of the first housing 100 and is connected to the upper portion of the first housing 100 and the detecting element 200 and the circuit board 300, So that a lower portion is inserted between the outer side walls, and is brought into contact with the upper surface of the pedestal 120.

In addition, the second housing 400 has a coupling groove 420 formed therein.

The coupling groove 420 is formed at a position corresponding to the coupling portion 140 as shown in FIG. 5, and the coupling portion 140 is bent and inserted into the coupling groove 420.

3 and 4, the coupling groove 420 is formed to open upwardly and outwardly from the outer circumferential surface of the second housing 400. As shown in FIG.

4 (b), the second housing 400 can be easily inserted into the coupling groove 420 from the first housing 100 It is possible to strongly prevent rotation in the horizontal direction or separation in the upward direction.

A mounting space for disposing the detecting element 200 and the circuit board 300 is formed between the first housing 100 and the second housing 400.

As shown in FIG. 3, the terminal 500 is bent into a substantially 'C' shape and is embedded in the second housing 400.

In the drawings of this embodiment, the terminal 500 is shown as three.

An air hole 410 is formed in the lower surface of the second housing 400 in the direction of the circuit board 300.

One end of the terminal 500 is mounted on the upper portion of the air hole 410 and the circuit board 300 is disposed on the lower portion of the air hole 410.

The elastic member 600 is inserted into the vent hole 410 so that an upper portion of the elastic member 600 is in contact with one end of the terminal 500 and a lower portion of the elastic member 600 is in contact with the circuit board 300, ).

In the present embodiment, the elastic member 600 is formed of a coil spring, and is inserted into the three pilot holes 410, respectively.

The elastic member 600 may be in a compressed state in a state where the first housing 100 and the second housing 400 are coupled to each other.

The length of the elastic member 600 is longer than the length of the air hole 410 and the elastic member 600 is inserted into the first housing 100 before the first housing 100 and the second housing 400 contact each other. One end of the terminal 500 disposed on the upper portion of the eye opening 410 is brought into contact with the circuit board 300.

The elastic member 600 may be attached to the air bearing hole 410 in a compressed state so that the elastic member 600 always connects the circuit board 300 and the terminal 500. [

Therefore, the electric signal of the circuit board 300 can be transmitted to the external device (not shown) connected to the other end of the terminal 500 through the elastic member 600 and the terminal 500.

The grounding member 700 is made of metal and serves to ground the circuit board 300 to a chassis or the like.

In the present embodiment, the grounding member 700 is formed of a leaf spring or a wire having a circular cross section and is disposed between the first housing 100 and the second housing 400 as shown in FIG. 2, The circuit board 300 is grounded to the first housing 100.

The grounding member 700 disposed between the first housing 100 and the second housing 400 connects the circuit board 300 and the first housing 100 to each other, 300 can easily be grounded.

Hereinafter, the grounding member 700 according to the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 6 is an exploded bottom perspective view showing a second housing and a grounding member of the pressure measuring device according to the first embodiment of the present invention, and FIG. 7 is a process diagram illustrating the assembling process of the D part shown in FIG.

As shown in FIGS. 2, 6 and 7, the grounding member 700 includes an engaging portion 710 and an elastic portion 720.

The coupling portion 710 is fixed to the lower surface of the second housing 400.

Accordingly, the grounding member 700 can be easily coupled to the lower surface of the second housing 400.

When the first housing 100 and the second housing 400 are assembled, the first housing 100 contacts the upper surface of the first housing 100.

Here, a coupling protrusion 430 protruding downward is formed on the lower surface of the second housing 400.

The coupling portion 710, which is formed of a leaf spring or a wire having a circular cross section, is elastically attached to the coupling protrusion 430 to be coupled with the coupling protrusion 430.

Accordingly, the grounding member 700 can be firmly fixed to the lower surface of the second housing 400.

The coupling portion 710 includes a first extending portion 711, a grounding portion 712, a second extending portion 713, and a first bent portion 714.

The first extension portion 711 is elastically contacted with a surface of the coupling protrusion 430 which is outwardly of the first housing 100 in a vertical direction.

The grounding part 712 has one end connected to the lower end of the first extending part 711 and the other end bent toward the inner side of the first housing 100, .

The second extending portion 713 is connected to the other end of the grounding portion 712 at one end and bent in the upward direction in which the second housing 400 is disposed, In the vertical direction on the other surface of the engaging projection 430,

Accordingly, the first extending portion 711 is resiliently attached to one surface of the engaging projection 430, and the second extending portion 713 is elastically brought into close contact with the other surface of the engaging projection 430, 710 are firmly resiliently coupled to the lower surface of the second housing 400 to prevent the grounding member 700 from being detached from the second housing 400.

The coupling portion 710 may be fixed to the lower surface of the second housing 400. However, if the coupling portion 710 is fixed to the lower surface of the second housing 400, The fixing protrusion 440 may protrude from the lower surface of the housing 400 instead of the fixing protrusion 430 so that the fixing portion 410 may be fixed to the fixing protrusion 440.

The fixing protrusions 440 protrude downward from the lower surface of the second housing 400 and are preferably spaced from each other by a distance slightly narrower than the width of the engaging portion 710 as shown in FIG. 1 pair.

The grounding portion 712 is inserted between the pair of the fixing protrusions 440 so that the grounding portion 712 is engaged and fixed by a pair of the fixing protrusions 440 in a fitting manner.

That is, the grounding member 712 is inserted between the fixing protrusions 440, which are spaced apart from each other by a distance slightly narrower than the width of the coupling portion 710, Can be easily coupled to the lower surface of the second housing 400.

7, the fixing protrusions 440 may protrude from the lower surface of the coupling protrusions 430. The fixing protrusions 440 may be formed on the lower surface of the second housing 400, The coupling portion 710 may be fixed through the coupling protrusion 430 and the fixing protrusion 440.

More specifically, the first extending portion 711 and the second extending portion 713 are elastically contacted to the coupling protrusion 430, and the grounding portion 712 extends from the lower surface of the coupling protrusion 430 And is fixed to the protruding fixing protrusion 440 in a fitting manner.

The first extending portion 711 and the second extending portion 713 are elastically brought into close contact with the engaging protrusion 430 so that the engaging portion 710 is reliably elastically pressed against the lower surface of the second housing 400 And the grounding member 712 is inserted between the fixing protrusions 440 protruding from the lower surface of the coupling protrusion 430 so that the grounding member 700 is inserted into the second housing 400, Thereby preventing free movement.

Here, when the first housing 100 and the second housing 400 are assembled together, the grounding portion 712 should contact the upper surface of the first housing 100.

For this, the height of the fixing protrusion 440 is preferably shorter than the thickness of the grounding portion 712.

7 (b), when the first housing 100 and the second housing 400 are assembled to each other, the grounding portion 712 is positioned above the lower surface of the fixing protrusion 440, The grounding portion 712 can be firmly brought into close contact with the upper surface of the first housing 100 by first contacting the upper surface of the first housing 100.

One end of the first bent portion 714 is connected to one end of the first extending portion 711 and extends in the direction of the first housing 100.

A support wall 450 is formed on the lower surface of the second housing 400 at a position spaced apart from the coupling protrusion 430 in the outer direction of the first housing 100, A support groove 460 is formed between the support walls 450.

The first bent portion 714 and the first extended portion 711 are accommodated in the support groove 460.

The first bent portion 714 received in the support groove 460 is in close contact with the support wall 450 and the first extended portion 711 is in close contact with one surface of the coupling protrusion 430.

The first bent portion 714 is resiliently supported on the support wall 450 so that the first extended portion 711 connected to the first bent portion 714 is elastically supported on one surface of the coupling protrusion 430 And is elastically contacted.

Accordingly, the first bent portion 714 is resiliently supported on the support wall 450 so that the first extended portion 711 is firmly and resiliently attached to one surface of the coupling protrusion 430, So that the grounding member 700 can be detached from the second housing 400.

The elastic portion 720 is connected to the coupling portion 710 and is disposed between the lower surface of the second housing 400 and the upper surface of the circuit board 300.

The elastic part 720 is disposed between the second housing 400 and the circuit board 300 and elastically compresses the first housing 100 and the second housing 400 when the first housing 100 and the second housing 400 are assembled, As shown in FIG.

therefore. The grounding member 700 disposed between the first housing 100 and the second housing 400 is electrically connected to the circuit board 300 and the first housing 100 by the coupling portion 710 and the elastic portion 720. [ By connecting the housing 100, the circuit board 300 can be easily grounded.

When the first housing 100 and the second housing 400 are assembled, the elastic portion 720 is elastically compressed to easily assemble the first housing 100 and the second housing 400 .

The elastic portion 720 includes a third extending portion 721 and a second bent portion 722.

The third extending portion 721 is formed such that one end thereof is connected to the coupling portion 710 and the other end is bent inward of the first housing 100, 2 housing (400).

The second bent portion 722 is connected to the other end of the third extending portion 721 and the other end is bent in an arc shape toward the circuit board 300 as shown in FIG. The lowest portion of the bent portion 722 is in close contact with the upper surface of the circuit board 300.

The second bent portion 722 is in contact with the upper surface of the circuit board 300 and the third extended portion 721 is protruded in the outer direction of the first housing 100, The circuit boards 300 having various areas can be mounted differently by the length of the third extending portion 721. [

The second bent portions 722 are formed in an arc shape in the direction of the circuit board 300 so that the second bent portions 722 are formed in the first housing 100 and the second housing 400 And is elastically deformed by being brought into close contact with the upper surface of the circuit board 300 when assembled.

7 (a), the grounding member 700 is positioned at a position where the distance from the third extending portion 721 to the lowermost point of the second bent portion 722 (D1 Is longer than the distance D2 from the third extending portion 721 to the upper surface of the circuit board 300. [

7 (b), the second bent portion 722 is formed on the circuit board 300 when the first housing 100 and the second housing 400 are assembled, The elastic portion 720 is elastically compressed so that the lowermost point of the second bent portion 722 can reliably contact the upper surface of the circuit board 300.

As described above, in the pressure measuring device, the grounding member 700 disposed between the first housing 100 and the second housing 400 contacts the circuit board 300 and the first housing 100, The circuit board 300 can be easily grounded.

An engaging projection 430 is formed on the lower surface of the second housing 400 to engage with the engaging portion 710. The engaging portion 710 is elastically brought into close contact with the engaging projection 430, The grounding member 700 can be firmly fixed to the lower surface of the second housing 400 and the fixing protrusions 440 are spaced apart from each other by a distance slightly narrower than the width of the coupling portion 710 And the engaging portion 710 is inserted between a pair of the fixing protrusions 440 so that the grounding member 700 can be easily coupled to the lower surface of the second housing 400.

The second bent portion 722 is formed in an arc shape in the direction of the circuit board 300 so that the second bent portion 722 is formed in the first housing 100 and the second housing 400 And is elastically deformed by being brought into close contact with the upper surface of the circuit board 300 when assembled.

The third extending portion 721 is held in contact with the lower surface of the second housing 400 and is extended from the third extending portion 721 to the lowermost point of the second bent portion 722 in a free state, The distance is longer than the distance from the third extension portion 721 to the upper surface of the circuit board 300 so that the elastic portion 720 is elastically compressed by the pressing of the circuit board 300 during assembly, The lowermost point of the second bent portion 722 can be reliably contacted with the upper surface of the circuit board 300.

The present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical idea of the present invention.

The present invention relates to a first housing, a first housing, and a second housing.
200: detection element
300: circuit board
The present invention relates to an apparatus and a method for manufacturing the same, and more particularly,
500: Terminal
600: elastic member
The present invention relates to a grounding member and a method of manufacturing the same. The grounding member includes a grounding member and a coupling unit. The second bent portion

Claims

A first housing formed of a metal and configured to expose a suction hole through which a fluid flows, from the bottom to the outside;
A detecting element coupled to the first housing and detecting a pressure of fluid introduced through the suction hole;
A circuit board mounted on the upper surface of the first housing and connected to the detecting element;
A second housing coupled to an upper portion of the first housing to hide the detecting element and the circuit board;
And a grounding member made of metal and disposed between the first housing and the second housing to ground the circuit board to the first housing,
The grounding member
An engaging portion fixed to a lower surface of the second housing and abutting the upper surface of the first housing when the first housing and the second housing are assembled;
And an elastic part connected to the coupling part and disposed between the lower surface of the second housing and the upper surface of the circuit board and being elastically compressed when the first housing and the second housing are assembled to be in close contact with the upper surface of the circuit board, ,
And a fixing protrusion coupled to the coupling portion protrudes downward from the lower surface of the second housing,
Wherein the fixing protrusions are formed of a pair spaced apart from each other by a distance narrower than the width of the engaging portion so that the engaging portion is inserted and disposed between a pair of the fixing protrusions.

The method according to claim 1,
A coupling protrusion protruding downward from the lower surface of the second housing,
And the coupling portion is elastically brought into close contact with the coupling projection.

delete

The method of claim 2,
The coupling portion
A first extension part elastically attached to one surface of the coupling protrusion which is outwardly of the first housing in a vertical direction;
A grounding portion connected at one end to the lower end of the first extending portion and the other end bent at the inner side of the first housing and disposed at the lower surface of the coupling protrusion;
And a second extension portion having one end connected to the other end of the ground portion and the other end bent in the direction of the second housing and being elastically contacted with the other surface of the coupling protrusion in the vertical direction in the inner direction of the first housing Characterized by a pressure measuring device.

The method of claim 4,
Wherein a support wall is formed on a lower surface of the second housing at a position spaced apart from the coupling protrusion in an outward direction of the first housing to form a support groove between the coupling protrusion and the support wall,
The coupling portion
And a first bent portion having one end connected to one end of the first extending portion and the other end inserted into the supporting groove,
Wherein the first bent portion is in close contact with the supporting wall, and the first extending portion is in close contact with one surface of the coupling protrusion.

The method of claim 4,
A fixing protrusion to which the grounding unit is coupled protrudes downward from the lower surface of the coupling protrusion,
And the thickness of the grounding portion is formed thicker than the height of the fixing protrusion.

The method according to claim 1,
The elastic portion
A third extension part having one end connected to the coupling part and the other end bent inward in the first housing;
And a second bent part connected at one end to the other end of the third extending part and bent at an opposite end to form an arcuate shape in the direction of the circuit board,
And the second bent portion is in close contact with the upper surface of the circuit board.

The method of claim 7,
The third extending portion is held in contact with the lower surface of the second housing,
The distance from the third extending portion to the lowermost point of the second bent portion in the free state is longer than the distance from the third extending portion to the upper surface of the circuit board,
Wherein the elastic portion is elastically compressed by pressing the circuit board at the time of assembling.