CN210092418U

CN210092418U - OSFP connector and PCB board of using thereof

Info

Publication number: CN210092418U
Application number: CN201921053788.7U
Authority: CN
Inventors: 徐启桂; 周胜先; 黄国勋
Original assignee: Anfeno East Asia Electronic Technology (shenzhen) Co Ltd
Current assignee: Anfeno East Asia Electronic Technology (shenzhen) Co Ltd; Amphenol East Asia Electronic Technology Shenzhen Ltd
Priority date: 2019-07-06
Filing date: 2019-07-06
Publication date: 2020-02-18
Anticipated expiration: 2029-07-06

Abstract

The utility model discloses an OSFP connector and a PCB board applied by the same, which comprises an outer shell, the outer shell is provided with an accommodating cavity, the rear end of the accommodating cavity is provided with a plug-in connecting piece, the plug-in connecting piece comprises a body, a signal terminal component accommodated in the body and a conductive component connected with the signal terminal component, the conductive assemblies are disposed around and through the middle of the signal terminal assemblies, the spacer assembly is composed of an upper spacer and a lower spacer which are easy to radiate heat, and is provided with an EMI elastic sheet II, the wall supporting part is provided with the EMI elastic sheet I which is contacted with the bottom of the plug connector, thereby realizing more effective shielding to electromagnetic wave interference, the first radiating hole can help to radiate heat to the maximum extent, and the effect of resisting electromagnetic interference cannot be influenced. And a copper foil area corresponding to the EMI elastic sheet I is arranged on the PCB applied to the connector, so that the mutual interference between the PCB and the outside is weakened.

Description

OSFP connector and PCB board of using thereof

Technical Field

The utility model relates to an OSFP connector and PCB board of using thereof.

Background

With the development of society and science and technology, the transmission speed of data is developing towards high speed, an OSFP connector for eight-channel signal transmission is created in order to meet the market demand for a high-speed pluggable solution with higher density, and both the speed and the density are greater than a four-channel connector, but the data transmission quantity of the eight-channel connector is increased, the temperature of the whole system and the connector is easily increased, and a higher requirement is provided in the aspects of controlling resonance and electromagnetic interference (EMI) interference resistance. More efficient heat dissipation, control of resonance, and resistance to electromagnetic interference are issues that continue to improve in the art. At present, the PCB corresponding to the connector in the market only has simple welding and circuit connection functions, and does not have corresponding anti-electromagnetic interference function.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides an OSFP connector and PCB board of using thereof.

The utility model provides a technical scheme that its technical problem adopted is: an OSFP connector comprises an outer shell with a first elastic pin at the bottom, wherein the outer shell is provided with a plurality of accommodating cavities which are linearly arranged, the rear end of each accommodating cavity is provided with a plug-in connecting piece, each plug-in connecting piece comprises a body with a positioning column, a signal terminal assembly accommodated in the body and a conductive assembly connected with the signal terminal assembly, the outer shell comprises a top wall part, a bottom wall part, a first wall part and a second wall part, the first wall part and the second wall part are respectively connected with two sides of the top wall part and the bottom wall part, a plurality of vertical third wall parts connected with the top wall part and the bottom wall part are arranged between the first wall part and the second wall part, a horizontal partition piece assembly connected with the third wall part and the first wall part or the second wall part or another third wall part is arranged in each accommodating cavity, the front end of each accommodating cavity is divided into an upper insertion cavity and a lower insertion cavity which are convenient for matching of an external plug and the plug-, end wall portion is close to the plug connector and is equipped with the support wall portion that just can the bearing plug connector with the plug connector joint, hold in the palm wall portion and be equipped with louvre two, the EMI shell fragment that contacts bottom the plug connector one, spacer subassembly includes spacer and lower spacer, it is gapped one down between the spacer, it establishes installing zone one to go up the one end that plug connector was kept away from to the spacer, installing zone two is established to the one end that plug connector was kept away from to the spacer down, install the EMI shell fragment two that contacts simultaneously with last spacer, lower spacer on installing zone one, the installing zone two.

Preferably, one end of the first wall portion, the second wall portion and the third wall portion close to the plug connector is provided with a first heat dissipation hole and a third heat dissipation hole, and the diameter of the first heat dissipation hole is set to be 2.8MM-3.2 MM.

Preferably, the upper spacer is provided with a projection extending into the body, the lower side of the upper spacer is provided with a first contact piece fixedly connected with the lower spacer, and the lower spacer is provided with a second contact piece fixedly connected with the upper spacer.

Preferably, the conductive assembly includes a first conductor, a second conductor, a third conductor, a fourth conductor, a fifth conductor, a sixth conductor, a seventh conductor, and an eighth conductor all connected to the signal terminal assembly, the signal terminal component is provided with a square through hole which penetrates through the signal terminal component, the first conductor and the second conductor are respectively arranged on the vertical edge and the horizontal edge of the square through hole, the third conductor and the fourth conductor are arranged on the side surface of the signal terminal component at a first distance and are parallel to the first conductor, the fifth conductor and the sixth conductor are arranged on the other side surface of the signal terminal component at a second distance and are parallel to the first conductor, the seventh conductor is arranged at the top of the signal terminal component and is parallel to the second conductor, and the eighth conductor is arranged at the bottom of the signal terminal component and is parallel to the second conductor.

Preferably, the first conductor, the second conductor, the third conductor, the fourth conductor, the fifth conductor, the sixth conductor, the seventh conductor and the eighth conductor are all in a strip shape with a width of 1.5MM-3.0MM and a thickness of 0.4MM-1.2MM and provided with a plurality of positioning grooves, the first distance is 6.00MM-6.30MM, and the second distance is 3.10MM-3.60 MM.

Preferably, the signal terminal assembly comprises a ground terminal unit, a first signal terminal unit, a second signal terminal unit, a first power terminal unit and a second power terminal unit which are arranged at intervals, and the ground terminal unit is provided with a positioning bolt corresponding to the positioning groove.

Preferably, the ground terminal unit is provided with a second elastic pin, the first signal terminal unit is provided with a third elastic pin, the second signal terminal unit is provided with a fourth elastic pin, the first power terminal unit is provided with a fifth elastic pin, and the second power terminal unit is provided with a sixth elastic pin.

A PCB board is applied to and connected with the OSFP connector and comprises a board body, wherein the board body is provided with a plurality of structure units which are identical and linearly arranged, each structure unit comprises a positioning hole corresponding to a positioning column, two rows of first through holes which are arranged on the outer side of the positioning hole and correspond to an elastic pin I, a second through hole which is arranged between the two rows of first through holes and corresponds to an elastic pin II, a third through hole which corresponds to an elastic pin III, a fourth through hole which corresponds to an elastic pin IV, a fifth through hole which corresponds to an elastic pin V and a sixth through hole which corresponds to an elastic pin VI, copper foil areas which can be connected with an EMI elastic sheet I are arranged between the two rows of first through holes at the lower sides of the second through hole, the third through hole, the fourth through hole or the fifth through hole, the sixth through hole, the third through hole or the fifth through hole, the sixth through hole or the fifth through hole sixth through hole, The four through holes are connected into a diagonal line, the diameter of the first through hole is set to be 0.9-1.1MM, and the diameters of the second through hole, the third through hole, the fourth through hole, the fifth through hole and the sixth through hole are set to be 0.29-0.45 MM.

The utility model provides an OSFP connector, signal terminal subassembly all is equipped with the electric conductor around and in the centre of passing signal terminal subassembly for the resonance that control ground terminal unit produced and the influence that forms electrical apparatus noise, spacer subassembly is by easily radiating last spacer and spacer constitution down and install EMI shell fragment two, holds in the palm wall portion and is equipped with the EMI shell fragment one that contacts bottom the plug-in connection spare, realizes more effectual shielding to electromagnetic interference, a louvre size can maximum help heat dissipation, can not influence anti electromagnetic interference's effect again and go up the spacer and down between the spacer gapped one, makes the heat of going up spacer and lower spacer pass the louvre three through the clearance again and disperse to the external world, and the heat dissipation is more high-efficient. The utility model provides a pair of when OSFP connector heat dissipation is higher stronger to electromagnetic wave interference killing feature, anti-resonance ability.

Be provided with the copper foil district that corresponds with EMI shell fragment on the PCB board that this connector was used to weaken PCB board and external mutual interference, reduced the PCB board and gone out the electromagnetic wave that overflows and to signal transmission's interference, strengthened PCB's rigidity again, made the utility model discloses can not damage the PCB board when the extrusion gets into through-hole one, through-hole two, through-hole three, through-hole four, through-hole five, through-hole six.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic diagram of an OSFP connector and a PCB assembly structure using the same according to the present invention;

fig. 2 is a schematic structural diagram of an OSFP connector according to the present invention;

fig. 3 is an exploded view of an OSFP connector of the present invention;

fig. 4 is a schematic view of the assembly of the signal terminal assembly and the conductive assembly of the present invention;

fig. 5 is a schematic structural view of the spacer assembly of the present invention;

fig. 6 is a schematic side view of a spacer assembly according to the present invention;

fig. 7 is a schematic structural diagram of a PCB of the present invention.

Detailed Description

Referring to fig. 1 to 6, the present invention is implemented as follows: the OSFP connector comprises an outer shell 1 with an elastic pin I11 at the bottom, wherein the outer shell 1 is provided with four accommodating cavities 2 which are linearly arranged, an inserting connection piece 3 is installed at the rear end of each accommodating cavity 2, each inserting connection piece 3 comprises a body 4 with a positioning column 41, a signal terminal assembly 5 accommodated in the body 4 and a conductive assembly 6 connected with the signal terminal assembly 5, each signal terminal assembly 5 comprises a grounding terminal unit 51, a first signal terminal unit 52, a second signal terminal unit 53, a first power terminal unit 54 and a second power terminal unit 55 which are arranged at intervals, and the grounding terminal unit 51, the first signal terminal unit 52 and the second signal terminal unit 53 are arranged on the left side and the right side of the first power terminal unit 54 and the second power terminal unit 55.

The ground terminal unit 51 is provided with a second elastic pin 511, the first signal terminal unit 52 is provided with a third elastic pin 521, the second signal terminal unit 53 is provided with a fourth elastic pin 531, the first power terminal unit 54 is provided with a fifth elastic pin 541, and the second power terminal unit 55 is provided with a sixth elastic pin 551.

The conductive assembly 6 comprises a first conductor 61, a second conductor 62, a third conductor 63, a fourth conductor 64, a fifth conductor 65, a sixth conductor 66, a seventh conductor 67 and an eighth conductor 68 which are all connected with a ground terminal unit 51, the signal terminal assembly 5 is provided with a square through hole 56 which penetrates through the ground terminal unit 51, the first signal terminal unit 52, the second signal terminal unit 53, the first power terminal unit 54 and the second power terminal unit 55, the square through hole 56 penetrates through a gap of an inner terminal of the signal terminal assembly 5, the first conductor 61 and the second conductor 62 are respectively arranged on the vertical edge and the horizontal edge of the square through hole 56, the third conductor 63 and the fourth conductor 64 are arranged on the side surface of the signal terminal assembly 5 at a first distance 69 and are parallel to the first conductor 61, the fifth conductor 65, A sixth conductor 66 is disposed on the other side of the signal terminal assembly 5 spaced a second distance 60 and parallel to the first conductor 61, a seventh conductor 67 is disposed on the top of the signal terminal assembly 5 and parallel to the second conductor 62, and an eighth conductor 68 is disposed on the bottom of the signal terminal assembly 5 and parallel to the second conductor 62.

The first conductor 61, the second conductor 62, the third conductor 63, the fourth conductor 64, the fifth conductor 65, the sixth conductor 66, the seventh conductor 67, and the eighth conductor 68 are each formed in a strip shape having a width of 2.6MM and a thickness of 0.7MM and provided with a plurality of positioning grooves 611, the first distance 69 is 6.15MM, and the second distance 60 is 3.40 MM.

The ground terminal unit 51 is provided with a positioning pin 517 corresponding to the positioning groove 611. The first conductor 61, the second conductor 62, the third conductor 63, the fourth conductor 64, the fifth conductor 65, the sixth conductor 66, the seventh conductor 67, and the eighth conductor 68 are inserted into the positioning groove 611 through the positioning pin 517, and are assembled and connected to the signal terminal assembly 5.

Because the utility model discloses during transmission large capacity, fast-speed signal, the resonance and the cluster of production are absorbed by first electric conductor 61, second electric conductor 62, third electric conductor 63, fourth electric conductor 64, fifth electric conductor 65, sixth electric conductor 66, seventh electric conductor 67, the eighth electric conductor 68 that are equipped with around the signal terminal subassembly 5 and the centre of passing signal terminal subassembly 5, and then improve optical fiber connector's signal transmission rate. Thereby achieving the control of resonance and the formation of the influence of electrical noise.

The outer shell 1 comprises a top wall part 12, a bottom wall part 13, a first wall part 14 and a second wall part 15, the first wall part 14 and the second wall part 15 are respectively connected with two sides of the top wall part 12 and the bottom wall part 13, a plurality of vertical third wall parts 16 connected with the top wall part 12 and the bottom wall part 13 are arranged between the first wall part 14 and the second wall part 15, the top wall part 12, the bottom wall part 13 and the third wall part 16 and the first wall part 14 or the second wall part 15 or another third wall part 16 form an accommodating cavity 2, a horizontal partition plate component 17 connected with the third wall part 16 and the first wall part 14 or the second wall part 15 or another third wall part 16 is arranged in the accommodating cavity 2, the partition plate component 17 divides the front end of the accommodating cavity 2 into an upper insertion cavity 21 and a lower insertion cavity 22 convenient for matching an external plug and the plug connector 3, the bottom wall part 13 is provided with a supporting wall part 131 which is clamped with the plug connector 3 and can support the plug connector 3 near the plug connector 3, the wall supporting portion 131 is provided with a second heat dissipation hole 133 at the bottom and a first EMI spring 132 contacting with the bottom of the plug connector 3. Elastic pins 11 are arranged at the bottoms of the first wall part 14, the second wall part 15 and the third wall part 16.

The spacer assembly 17 comprises an upper spacer 171 and a lower spacer 172, a gap 179 is formed between the upper spacer 171 and the lower spacer 172, a first mounting area 173 is arranged at one end of the upper spacer 171, which is far away from the plug connector 3, a second mounting area 174 is arranged at one end of the lower spacer 172, which is far away from the plug connector 3, and two EMI elastic sheets 175, which are simultaneously contacted with the upper spacer 171 and the lower spacer 172, are arranged on the first mounting area 173 and the second mounting area 174.

The upper spacer 171 is provided with a lug 176 extending into the body 4 so as to relatively stabilize the position between the upper spacer 171 and the body 4, the lower side of the upper spacer 171, which is positioned on the side of the lug 176, is provided with a first contact piece 177 fixedly connected with the lower spacer 172 in a spot welding manner, and the lower spacer 172 is provided with a second contact piece 178 fixedly connected with the upper spacer 171 in a spot welding manner, so that the stable connection between the upper spacer 171 and the lower spacer 172 is ensured, and the formation of the spacer assembly 17 connected with the outer shell 1 is ensured. Go up spacer 171 and exist clearance one 179 down between spacer 172, make the utility model discloses dispel the heat more easily in spacer subassembly 17's region, and installed two 175 EMI shell fragments, this two 175 EMI shell fragments have covered the clearance between outside plug and the shell body 1, realize the more effective shielding to electromagnetic interference.

One end of the first wall portion 14, the second wall portion 15 and the third wall portion 16 close to the plug connector 3 is provided with a first heat dissipation hole 151 and a third heat dissipation hole 152, and the diameter of the first heat dissipation hole 151 is set to be 3.00 MM. The first heat dissipation hole 151 can help to dissipate heat to the maximum extent, and the anti-electromagnetic interference effect cannot be influenced. The heat dissipation hole three 152 is disposed in a position parallel to the protrusion 176, and when the external plug and the plug connector 3 are mutually matched, heat generated is transferred to the gap one 179 through the upper spacer 171 and the lower spacer 172 and then is dissipated to the outside through the heat dissipation hole three 152.

The utility model provides a pair of when OSFP heat dissipation is higher stronger to electromagnetic wave interference killing feature, anti-resonance ability.

Referring to fig. 7, the present invention further provides a PCB, wherein the PCB is applied to the above OSFP connector, and the OSFP connector includes a board body 100, the board body 100 is provided with a plurality of identical and linearly arranged structural units 200, the structural unit 200 includes a positioning hole 201 corresponding to the positioning post 41, two rows of through holes 202 disposed outside the positioning hole 201 and corresponding to the first elastic pin 11, a second through hole 203 disposed between the two rows of through holes 202 and corresponding to the second elastic pin 511, a third through hole 204 corresponding to the third elastic pin 521, a fourth through hole 205 corresponding to the fourth elastic pin 531, a fifth through hole 206 corresponding to the fifth elastic pin 541, and a sixth through hole 208 corresponding to the sixth elastic pin 551, and a copper foil area 207 capable of being connected to the first EMI spring 132 is disposed under the second through hole 203, the third through hole 204, the fourth through hole 205, the fifth through hole 206, and the sixth through hole 208 and between the two rows of through holes 202, oblique lines are connected between the second through hole 203 and the third through hole 204, the fourth through hole 205 or the fifth through hole 206, the sixth through hole 208, the third through hole 204 or the fifth through hole 206, the sixth through hole 208 and the fourth through hole 205. The diameter of the first through hole 202 is set to be 1.0MM, and the diameters of the second through hole 203, the third through hole 204, the fourth through hole 205, the fifth through hole 206 and the sixth through hole 208 are set to be 0.37 MM.

The positioning post 41 of the OSFP connector is inserted into the positioning hole 201, and at the same time, the first elastic pin 11, the second elastic pin 511, the third elastic pin 521, the fourth elastic pin 531, the fifth elastic pin 541, and the sixth elastic pin 551 are respectively aligned with the first through hole 202, the second through hole 203, the third through hole 204, the fourth through hole 205, the fifth through hole 206, and the sixth through hole 208, and then the connector is pushed and pressed toward the body 4, so that the first elastic pin 11, the second elastic pin 511, the third elastic pin 521, the fourth elastic pin 531, the fifth elastic pin 541, and the sixth elastic pin 551 are respectively extruded to form interference fit into the first through hole 202, the second through hole 203, the third through hole 204, the fourth through hole 205, the fifth through hole 206, and the sixth through hole 208. The EMI elastic sheet I132 is connected with the copper foil area 207 to form an EMI shielding cover, so that mutual interference between the PCB and the outside is weakened, interference of electromagnetic waves overflowing from the PCB on signal transmission is reduced, and the rigidity of the PCB is enhanced, so that the OSFP connector cannot damage the PCB when being extruded into the through hole I202, the through hole II 203, the through hole III 204, the through hole IV 205, the through hole V206 and the through hole VI 208.

Claims

1. The utility model provides an OSFP connector, includes that the bottom is equipped with shell body (1) of elastic pin (11), shell body (1) is equipped with a plurality of holding chambeies (2) of arranging linearly, plug connector (3) are installed to the rear end in holding chamber (2), plug connector (3) including body (4) that are equipped with reference column (41), accept signal terminal subassembly (5) in body (4), conductive component (6) of being connected with signal terminal subassembly (5), shell body (1) is including top wall portion (12), end wall portion (13), first wall portion (14), second wall portion (15) connect the both sides of top wall portion (12), end wall portion (13) respectively, be equipped with a plurality of vertical connection top wall portion (12) between first wall portion (14), second wall portion (15), A third wall part (16) of the bottom wall part (13), characterized in that a spacer assembly (17) which is horizontal and connects the third wall part (16) with the first wall part (14) or the second wall part (15) or another third wall part (16) is arranged in the accommodating cavity (2), the front end of the accommodating cavity (2) is divided into an upper insertion cavity (21) and a lower insertion cavity (22) which are convenient for an external plug to be matched with the plug connector (3) by the spacer assembly (17), the bottom wall part (13) is provided with a supporting wall part (131) which is clamped with the plug connector (3) and can support the plug connector (3) near the plug connector (3), the supporting wall part (131) is provided with two heat dissipation holes (133) and an EMI elastic sheet (132) which is contacted with the bottom of the plug connector (3), the spacer assembly (17) comprises an upper spacer (171) and a lower spacer (172), and a gap (179) is reserved between the upper spacer (171) and the lower spacer (172), go up spacer (171) and keep away from the one end of plug connector (3) and establish installing zone one (173), installing zone two (174) are established to the one end that plug connector (3) was kept away from in spacer (172) down, install on installing zone one (173), installing zone two (174) with last spacer (171), lower spacer (172) simultaneously contact EMI shell fragment two (175).

2. The OSFP connector as claimed in claim 1, wherein said first wall portion (14), said second wall portion (15) and said third wall portion (16) have a first heat dissipation hole (151) and a third heat dissipation hole (152) at ends thereof adjacent to said plug connector (3), and said first heat dissipation hole (151) has a diameter of 2.8MM to 3.2 MM.

3. An OSFP connector in accordance with claim 2 wherein said upper spacer (171) is provided with a projection (176) extending into the body (4), the underside of said upper spacer (171) is provided with a first contact (177) fixedly connected to a lower spacer (172), and said lower spacer (172) is provided with a second contact (178) fixedly connected to said upper spacer (171).

4. The OSFP connector as claimed in claim 1, wherein the conductive member (6) comprises a first conductor (61), a second conductor (62), a third conductor (63), a fourth conductor (64), a fifth conductor (65), a sixth conductor (66), a seventh conductor (67) and an eighth conductor (68) which are all connected to the signal terminal assembly (5), the signal terminal assembly (5) is provided with a square through hole (56) passing through the signal terminal assembly (5), the first conductor (61) and the second conductor (62) are respectively arranged on the vertical side and the horizontal side of the square through hole (56), the third conductor (63) and the fourth conductor (64) are arranged on the side of the signal terminal assembly (5) at a first distance (69) and are parallel to the first conductor (61), and the fifth conductor (65) is arranged on the side of the signal terminal assembly (5), The sixth conductor (66) is arranged on the other side surface of the signal terminal assembly (5) at intervals of the second distance (60) and is parallel to the first conductor (61), the seventh conductor (67) is arranged on the top of the signal terminal assembly (5) and is parallel to the second conductor (62), and the eighth conductor (68) is arranged on the bottom of the signal terminal assembly (5) and is parallel to the second conductor (62).

5. An OSFP connector in accordance with claim 4 wherein said first (61), second (62), third (63), fourth (64), fifth (65), sixth (66), seventh (67) and eighth (68) conductors are each formed as a strip having a width of 1.5MM to 3.0MM, a thickness of 0.4MM to 1.2MM and a plurality of detents (611), said first distance (69) being 6.00MM to 6.30MM and said second distance (60) being 3.10MM to 3.60 MM.

6. An OSFP connector in accordance with claim 5 wherein said signal terminal assembly (5) includes a ground terminal element (51), a first signal terminal element (52), a second signal terminal element (53), a first power terminal element (54), a second power terminal element (55) arranged at intervals, said ground terminal element (51) being provided with positioning pegs (517) corresponding to the positioning slots (611).

7. An OSFP connector in accordance with claim 6 wherein said ground terminal unit (51) is provided with a second resilient pin (511), said first signal terminal unit (52) is provided with a third resilient pin (521), said second signal terminal unit (53) is provided with a fourth resilient pin (531), said first power terminal unit (54) is provided with a fifth resilient pin (541), and said second power terminal unit (55) is provided with a sixth resilient pin (551).

8. A PCB (printed circuit board), which is characterized in that the PCB is used for connecting the OSFP connector as claimed in claims 1 to 7, and comprises a board body (100), wherein the board body (100) is provided with a plurality of structure units (200) which are identical and arranged linearly, each structure unit (200) comprises a positioning hole (201) corresponding to a positioning column (41), two rows of first through holes (202) which are arranged outside the positioning hole (201) and correspond to first elastic pins (11), a second through hole (203) which is arranged between the two rows of first through holes (202) and corresponds to second elastic pins (511), a third through hole (204) which corresponds to third elastic pins (521), a fourth through hole (205) which corresponds to fourth elastic pins (531), a fifth through hole (206) which corresponds to fifth elastic pins (541), and a sixth through hole (208) which corresponds to sixth elastic pins (551), and the through holes are positioned in the second through holes (203), the third through holes (204) and the sixth through holes (, A copper foil area (207) which can be connected with the EMI elastic sheet I (132) is arranged on the lower side of the through hole I (205), the through hole II (206) and the through hole III (208) and the through hole III (205) or between the through hole II (206), the through hole III (208) and the through hole III (204) or between the through hole II (206), the through hole III (208) and the through hole IV (205) to form oblique lines, the diameter of the through hole I (202) is set to be 0.9-1.1MM, and the diameters of the through hole II (203), the through hole III (204), the through hole IV (205), the through hole V (206) and the through hole VI (208) are set to be 0.29-0.45 MM.