TWI902141B - Floating connector and mating connector thereof - Google Patents

Abstract

A floating connector and a mating connector thereof are disclosed. The floating connector comprises a first housing, a second housing, a plurality of signal contacts and a plurality of power source contacts, wherein the second housing has a fitting portion to be engaged with the mating connector in a first direction, and the second housing is disposed to the first housing in such a manner that it is movable in a plane perpendicular to the first direction. The signal contacts and the power source contacts are arranged along a second direction perpendicular to the first direction. The power source contacts are arranged at two sides of a signal contact group consisting of the plurality of signal contacts and spaced from the signal contact group. When viewed from a third direction perpendicular to both the first and second directions, a central axis of a power source side spring portion is offset inward in the second direction with respect to a central axis of a power source side fixed portion. Accordingly, interference between the power source contacts and the first housing during floating of the second housing can be prevented.

Description

Floating connectors and their mating connectors

This invention relates to floating connectors and their mating connectors, particularly a hybrid floating connector and its mating connector having both signal and power contacts.

A hybrid floating connector with both signal and power contacts is known for transmitting signals and power between circuit boards. This hybrid floating connector is disclosed in US Patent 9484656B2.

However, when the circuit board pad layout is predefined and the connector's external dimensions are strictly specified, it may be necessary to misalign a portion of the power contacts relative to other portions. This is to prevent interference between the power contacts and the fixed housing during the floating of the movable housing, and also to ensure that the gaps between the signal and power contacts on the contact side differ from those on the solder side. The connector disclosed in US9484656B2 does not meet this requirement.

One objective of this invention is to provide a floating connector that ensures a certain distance between power contacts and signal contacts while also allowing for miniaturization of the connector.

Another object of this invention is to provide a floating connector that can absorb positioning errors of circuit boards or board-mounted connectors.

According to an embodiment of the present invention, a floating connector is provided, including a first housing, a second housing, a plurality of signal contacts, and a plurality of power contacts. The second housing has a mating portion that engages with a mating connector in a first direction. The second housing is mounted to the first housing in a manner that allows it to move in a plane perpendicular to the first direction. The plurality of signal contacts and the plurality of power contacts are arranged along a second direction perpendicular to the first direction. The plurality of power contacts are arranged on both sides of a signal contact group consisting of the plurality of signal contacts and are spaced apart from the signal contact group. Each signal contact includes: a signal-side fixing part, a first signal-side holding part, a signal-side spring part, a second signal-side holding part, and a signal-side contact part. The first signal-side holding part is held by the first housing, the second signal-side holding part is held by the second housing, and the first signal-side contact part... The signal-side retaining portion extends from the signal-side fixing portion, the signal-side spring portion connects the first signal-side retaining portion and the second signal-side retaining portion, and the signal-side contact portion extends from the second signal-side retaining portion; each power contact includes: a power-side fixing portion, a first power-side retaining portion, a power-side spring portion, a second power-side retaining portion, and a power-side contact portion, the first power-side retaining portion being held by the first housing, and the second power-side retaining portion being... The first power-side retaining portion, held by the second housing, extends from the power-side fixing portion. A power-side spring portion connects the first power-side retaining portion and the second power-side retaining portion. A power-side contact portion extends from the second power-side retaining portion. When viewed from a third direction perpendicular to both the first and second directions, the central axis of the power-side spring portion is offset inwardly in the second direction relative to the central axis of the power-side fixing portion.

According to the floating connector of the present invention, each signal contact has a first width, and each power contact has a second width, the second width being greater than the first width.

According to the floating connector of this invention, the power supply side spring section has a plurality of elongated narrow slits.

According to the floating connector of the present invention, when viewed from the third direction, the central axis of the power supply side spring is misaligned inward in the second direction relative to the central axis of the power supply side contact.

According to the floating connector of the present invention, the plurality of signal contacts and the plurality of power contacts are arranged in two rows along the second direction.

According to the floating connector of the present invention, when viewed from the second direction, the bending structure of the signal-side spring portion differs from the bending structure of the power-side spring portion.

According to the floating connector of the present invention, the extension length of the power-side spring portion is greater than the extension length of the signal-side spring portion.

According to the floating connector of the present invention, the signal-side spring portion has a signal-side vertical extension along the first direction, and the power-side spring portion has a power-side vertical extension along the first direction. When viewed from the second direction, the power-side vertical extension is offset inward relative to the signal-side vertical extension in the third direction.

According to another embodiment of the present invention, a mating connector for mating with a floating connector is provided, comprising: a fixed housing, a plurality of signal contacts, and a plurality of power contacts. The fixed housing has a mating portion that engages with the floating connector in a first direction. The plurality of signal contacts and the plurality of power contacts are arranged along a second direction perpendicular to the first direction and held by the fixed housing. The components are disposed on both sides of a signal contact group consisting of the plurality of signal contact components and spaced apart from the signal contact group; wherein each power contact has a power-side fixing portion at one end and a power-side contact portion at the other end, and when viewed from a third direction perpendicular to the first direction and the second direction, the central axis of the power-side contact portion is offset inward in the second direction relative to the central axis of the power-side fixing portion.

According to the pairing connector of the present invention, each signal contact has a first width, and each power contact has a second width, the second width being greater than the first width.

Those skilled in the art to which this invention pertains will best understand the technical features, other objectives, and advantages of this invention upon referring to the description and accompanying drawings.

1: Board-to-board connector assembly

10: Floating Connector

11: First Shell

110: Containment Space

12: Second Shell

120: Main Body

121: Limit Block

1200: Fitting Slot

13: Signal Contacts

131: Signal-side fixing part

132: First signal side holding section

133: Signal side spring section

1331: First Extension

1332: First Curve

1333: Second Extension

1334: Second Curve

1335: Third Extension

134: Second signal side holding section

135: Signal-side contact area

14: Power Contacts

141: Power supply side mounting part

142: First power supply side retaining section

143: Power supply side spring section

1430A: Elongated slot

1430B: Elongated slot

1431: First Extension

1432: First Curve

1433: Second Extension

1434: Second Curve

1435: Third Extension

144: Second power supply side retaining section

145: Power supply side contact area

15: U-shaped metal fittings

16: Power Contacts

161: Power supply side mounting part

162: First power supply side retaining section

163: Power supply side spring section

1630A: Elongated slot

1630B: Elongated slot

1631: First Extension

1632: Curved section

1633: Second Extension

164: Second power supply side retaining section

165: Power supply side contact area

18: Power Contacts

181: Power supply side mounting part

182: First power supply side retaining section

183: Power supply side spring section

1830A: Elongated slot

1830B: Elongated slot

1831: First Extension

1832: First Curve

1833: Second Extension

1834: Second Curve

184: Second power supply side retaining section

185: Power supply side contact area

20: Pairing Connectors

21: Fixed Shell

211: Tongue slice

22: Signal Contacts

221: Signal-side fixing part

222: First signal side holding section

223: Signal lateral bend extension

224: Second signal side holding section

225: Signal-side contact area

23: Power Contacts

231: Power supply side mounting part

232: First power supply side retaining section

233: Power Supply Side Bend Extension

234: Second power supply side retaining section

235: Power supply side contact area

A1: Center line

A2: Center Line

A3: Center Line

A4: Center Line

A5: Center Line

D1: First Direction

D2: Second Direction

D3: Third direction

P1: First Circuit Board

P2: Second Circuit Board

Figure 1 is a perspective view of the board-to-board connector assembly in the mating state according to an embodiment of the present invention.

Figure 2 is a perspective view of the board-to-board connector assembly according to an embodiment of the present invention in its unfitted state.

Figure 3 is a perspective view of a floating connector according to an embodiment of the present invention.

Figure 4 is an exploded perspective view of a floating connector according to an embodiment of the present invention.

Figure 5 is a perspective view of the signal contact and power contact of the floating connector according to an embodiment of the present invention, wherein one signal contact and one power contact are depicted in enlarged form.

Figure 6 is a magnified view of the power contact in Figure 5 from a third-party perspective.

Figure 7 is a view of the signal contact and power contact according to an embodiment of the present invention from a second direction.

Figure 8 is a perspective view of a first variation of the power contact of the floating connector.

Figure 9 is a view of the first variation of the signal contact and power contact from a second direction.

Figure 10 is a perspective view of a second variation of the power contact of the floating connector.

Figure 11 is a view of a second variation of the signal contact and power contact, viewed from a second direction.

Figure 12 is a perspective view of a mating connector according to an embodiment of the present invention.

Figure 13 is an exploded perspective view of a mating connector according to an embodiment of the present invention.

Figure 14 is a perspective view of the signal contacts and power contacts of the mating connector according to an embodiment of the present invention.

Figure 15 is a third-party view of the signal contacts and power contacts of the mating connector according to an embodiment of the present invention.

The board-to-board connector assembly of this invention will be described below with reference to the accompanying drawings. In the drawings, identical components or components with the same function are indicated by the same component symbols. The drawings are not to scale.

Referring to Figures 1 and 2, the constituent elements of the board-to-board connector assembly according to an embodiment of the present invention are briefly described, wherein Figure 1 is a perspective view of the board-to-board connector assembly in the mated state according to an embodiment of the present invention, and Figure 2 is a perspective view of the board-to-board connector assembly in the unmated state according to an embodiment of the present invention. The board-to-board connector assembly is generally indicated by component symbol 1.

The board-to-board connector assembly 1 includes a floating connector 10 and a mating connector 20 that mates with the floating connector 10. The floating connector 10 and the mating connector 20 are engaged with each other in a first direction D1. The floating connector 10 is fixed to a first circuit board P1 using surface mount technology, while the mating connector 20 is fixed to a second circuit board P2 using surface mount technology. An electrical connection is established between the first circuit board P1 and the second circuit board P2 through the board-to-board connector assembly 1. Because the floating connector 10 has a buoyant, movable housing, it can absorb positioning errors of the connector or circuit board.

Referring to Figures 3 and 4, a floating connector 10 according to an embodiment of the present invention is briefly described. As shown in Figures 3 and 4, the floating connector 10 includes a first housing 11 as a fixed housing, a second housing 12 as a movable housing, a plurality of signal contacts 13, and a plurality of power contacts 14. The first housing 11 and the second housing 12 are injection molded from insulating resin or polymer material. The signal contacts 13 and the power contacts 14 are made of conductive material (e.g., copper or copper alloy).

The first shell 11 has a receiving space 110, and the lower part of the second shell 12 is received within the receiving space 110. A gap is provided between the first shell 11 and the second shell 12, allowing the second shell 12 to move relative to the first shell 11 in a plane perpendicular to the first direction D1.

The second shell 12 has a main body 120 and limiting blocks 121 formed at both ends of the main body 120. The main body 120 of the second shell 12 has fitting slots 1200 serving as fitting parts. Two U-shaped metal fittings 15 are respectively fitted to both ends of the first shell 11 to interfere with the limiting blocks 121. The U-shaped metal fittings 15 prevent movement of the second shell 12 in the first direction D1 and prevent the second shell 12 from detaching from the first shell 11. In this way, the second shell 12 is restricted to move only relative to the first shell 11 in a plane perpendicular to the first direction D1.

Figure 5 is a perspective view of the signal contact 13 and the power contact 14. As shown in Figure 5, the signal contact 13 and the power contact 14 are arranged in two columns along a second direction D2 perpendicular to the first direction D1. The contacts in the two columns are mirror-symmetrical to each other. In each column of contacts, two power contacts 14 are respectively arranged on both sides of the signal contact group composed of signal contacts 13 and separated from the signal contact group. However, the invention is not limited to this; in each column of contacts, two power contacts 14 may also be arranged on the same side of the signal contact group. Although in this embodiment only one power contact is configured on each side of the signal contact group in each row of contacts, more than two power contacts may be configured on each side of the signal contact group if needed.

In this embodiment, the floating connector 10 has 140 signal contacts 13 and 4 power contacts 14. However, the invention is not limited thereto, and the number of signal contacts or power contacts can be increased or decreased as needed.

Each signal contact 13 includes: a signal-side fixing portion 131, a first signal-side holding portion 132, a signal-side spring portion 133, a second signal-side holding portion 134, and a signal-side contact portion 135. The first signal-side holding portion 132 extends from the signal-side fixing portion 131. The signal-side spring portion 133 connects the first signal-side holding portion 132 and the second signal-side holding portion 134. The signal-side contact portion 135 extends from the second signal-side holding portion 134. The signal-side fixing portion 131 will be fixed to the circuit board using surface mount technology. A first signal-side retaining portion 132, having a barbed structure, is press-fitted into and held by the first housing 11. A second signal-side retaining portion 134, having a barbed structure, is press-fitted into and held by the second housing 12.

The signal-side spring portion 133 of the signal contact 13 sequentially includes: a first extension 1331, a first bend 1332, a second extension 1333, a second bend 1334, and a third extension 1335. The first extension 1331 and the third extension 1335 extend obliquely relative to the first direction D1. The second extension 1333 extends in the first direction D1.

Each power contact 14 includes: a power-side fixing portion 141, a first power-side holding portion 142, a power-side spring portion 143, a second power-side holding portion 144, and a power-side contact portion 145. The first power-side holding portion 142 extends from the power-side fixing portion 141. The power-side spring portion 143 connects the first power-side holding portion 142 and the second power-side holding portion 144. The power-side contact portion 145 extends from the second power-side holding portion 144. The power-side fixing portion 141 will be fixed to the circuit board by surface mount technology. A first power-side retaining portion 142, having a barbed structure, is press-fitted into and held by the first housing 11. A second power-side retaining portion 144, having a barbed structure, is press-fitted into and held by the second housing 12.

The power contact 14's power-side spring portion 143 sequentially includes: a first extension 1431, a first bend 1432, a second extension 1433, a second bend 1434, and a third extension 1435. The first extension 1431 and the third extension 1435 extend obliquely relative to the first direction D1. The second extension 1433 extends in the first direction D1.

The signal-side contact 135 of the signal contact 13 and the power-side contact 145 of the power contact 14 are located within the mating slot 1200 of the second housing 12 for contact with the contacts of the mating connector.

Figure 6 is an enlarged view of the power contact 14 as seen from a third direction (D3) in Figure 5. As shown in Figure 6, the power contact 14 is configured such that the center line A2 of the power-side spring portion 143 is misaligned relative to the center line A1 of the power-side fixing portion 141 and the center line A3 of the power-side contact portion 145 in a leftward (i.e., inward) direction. This prevents interference between the power contact 14 and the first housing 11 during the movement of the second housing 12 relative to the first housing 11.

Figure 7 is a view of the signal contact 13 and power contact 14 according to an embodiment of the present invention, viewed from the second direction D2. In Figure 7, the signal-side fixing portion, first signal-side holding portion, second signal-side holding portion, and signal-side contact portion of the signal contact 13 substantially overlap with the power contact 14, but the bending structure of the signal-side spring portion of the signal contact 13 differs from the bending structure of the power-side spring portion of the power contact 14. This is significantly different from the prior art. In conventional hybrid floating connectors, for ease of manufacturing, the spring portions of the power contact and the signal contact typically have the same or similar bending structures.

Because the power contact 14 has a wider width than the signal contact 13, the power-side spring 143 of the power contact 14 has greater stiffness compared to the signal-side spring 133 of the signal contact 13. Reducing the stiffness of the power-side spring 143 of the power contact 14 to make it easier to deform is highly advantageous in order to promote the levitation of the second housing.

As can be seen in Figure 5, a plurality of elongated slots 1430A and 1430B extending along the longitudinal direction are formed in the power-side spring portion 143 of the power contact 14, wherein elongated slots 1430A and 1430B are spaced apart. The formation of elongated slots 1430A and 1430B weakens the power-side spring portion 143.

The stiffness of the power-side spring portion 143 may also be reduced by extending the length of the power-side spring portion 143. As shown in FIG7, the power-side spring portion 143 of the power contact 14 has a vertical extension portion (i.e., a second extension portion 1433) extending in the first direction D1, and the signal-side spring portion 133 of the signal contact 13 has a vertical extension portion (i.e., a second extension portion 1333) extending in the first direction D1. The power-side spring portion 143 of the power contact 14 is configured such that the vertical extension portion (i.e., the second extension portion 1433) of the power-side spring portion 143 is offset inward in the third direction D3 relative to the vertical extension portion (i.e., the second extension portion 1333) of the signal-side spring portion 133. In this way, the extension length of the power supply side spring section 143 is increased.

Figure 8 is a perspective view of a first variant of the power contact of the floating connector. The power contact according to the first variant is generally indicated by component symbol 16. Descriptions of the parts of the power contact 16 that are the same as those of the power contact 14 are omitted. The power contact 16 has a power-side fixing portion 161, a first power-side holding portion 162, a power-side spring portion 163, a second power-side holding portion 164, and a power-side contact portion 165. A plurality of elongated slots 1630A and 1630B extending along the longitudinal direction are formed in the power-side spring portion 163 of the power contact 16, wherein the elongated slots 1630A and 1630B are spaced apart. The elongated slots 1630A and 1630B are used to weaken the spring portion 163 on the power supply side.

The power-side spring portion 163 has a first extension 1631, a bent portion 1632, and a second extension 1633. FIG9 is a view of the signal contact 13 and power contact 16 according to an embodiment of the present invention, viewed from a second direction D2. As shown in FIG9, the second extension 1633 is a vertical extension extending in the first direction D1 and is aligned with the second power-side holding portion 164 and the power-side contact portion 165. The power-side spring portion 163 of the power contact 16 is configured such that the vertical extension of the power-side spring portion 163 (i.e., the second extension 1633) is offset inward in a third direction D3 relative to the vertical extension of the signal-side spring portion 133 (i.e., the second extension 1333).

Figure 10 is a perspective view of a second variation of the power contact of the floating connector. The power contact according to the second variation is generally indicated by component symbol 18. Descriptions of the parts of the power contact 18 that are the same as those of the power contact 14 or 16 are omitted. The power contact 18 has a power-side fixing portion 181, a first power-side holding portion 182, a power-side spring portion 183, a second power-side holding portion 184, and a power-side contact portion 185. A plurality of elongated slots 1830A and 1830B extending along the longitudinal direction are formed in the power-side spring portion 183 of the power contact 18, wherein the elongated slots 1830A and 1830B are spaced apart. The power supply side spring portion 183 is weakened by forming elongated slots 1830A and 1830B.

The power-side spring portion 183 has a first extension 1831, a first bend 1832, a second extension 1833, and a second bend 1834. FIG11 is a view of the signal contact 13 and the power contact 18 according to an embodiment of the present invention, viewed from the second direction D2. As shown in FIG11, the second extension 1833 is a vertical extension extending in the first direction D1. In FIG11, the second extension 1833 is not aligned with the second power-side holding portion 184 and the power-side contact portion 185, but the second extension 1833 is substantially aligned with the second extension 1333 of the signal-side spring portion 133.

The mating connector of the floating connector 10 will be described in summary below with reference to Figures 12 and 13, where Figure 12 is a perspective view of the mating connector of the floating connector 10, and Figure 13 is an exploded perspective view of the mating connector of the floating connector 10. The mating connector is indicated by component symbol 20.

The mating connector 20 includes a housing 21, a plurality of signal contacts 22, and a plurality of power contacts 23. The housing 21 is injection molded from an insulating resin or polymer material. The signal contacts 22 and power contacts 23 are made of a conductive material (e.g., copper or copper alloy). The housing 21 has a tongue 211 serving as a mating portion.

Figure 14 is a perspective view of the signal contact 22 and the power contact 23. As shown in Figure 14, the signal contact 22 and the power contact 23 are arranged in two columns along a second direction D2 perpendicular to the first direction D1. The contacts in the two columns are mirror-symmetrical to each other. In each column, two power contacts 23 are respectively arranged on both sides of the signal contact group formed by the signal contacts 22 and separated from the signal contact group. However, the invention is not limited thereto. The contact layout of the mating connector depends on the contact layout of the floating connector.

Each signal contact 22 includes: a signal-side fixing portion 221, a first signal-side holding portion 222, a signal-side bent extension portion 223, a second signal-side holding portion 224, and a signal-side contact portion 225. The first signal-side holding portion 222 extends from the signal-side fixing portion 221. The signal-side bent extension portion 223 connects the first signal-side holding portion 222 and the second signal-side holding portion 224. The signal-side contact portion 225 extends from the second signal-side holding portion 224. The signal-side fixing portion 221 will be fixed to the circuit board using surface mount technology. The first signal-side retaining portion 222 and the second signal-side retaining portion 224, both having barbed structures, are press-fitted into and held by the retaining housing 21. Specifically, the first signal-side retaining portion 222 is fixed near the lower edge of the retaining housing 21, while the second signal-side retaining portion 224 is fixed to the tongue 211. The signal-side contact portion 225 is positioned on the tongue 211.

Each power contact 23 includes: a power-side fixing portion 231, a first power-side holding portion 232, a power-side bent extension portion 233, a second power-side holding portion 234, and a power-side contact portion 235. The first power-side holding portion 232 extends from the power-side fixing portion 231. The power-side bent extension portion 233 connects the first power-side holding portion 232 and the second power-side holding portion 234. The power-side contact portion 235 extends from the second power-side holding portion 234. The power-side fixing portion 231 will be fixed to the circuit board by surface mount technology. The first power-side retaining portion 232 and the second power-side retaining portion 234, both having barbed structures, are press-fitted into and held by the retaining housing 21. Specifically, the first power-side retaining portion 232 is fixed near the lower edge of the retaining housing 21, while the second power-side retaining portion 234 is fixed to the tongue 211. The power-side contact portion 235 is positioned on the tongue 211.

Figure 15 is a view of the signal contact 22 and power contact 23 of the mating connector 20 from a third direction D3. As shown in Figure 15, the center line A5 of the power-side contact 235 is offset inward in the second direction D2 relative to the center line A4 of the power-side fixing part 231. By utilizing the misalignment of the power-side contact 235 relative to the power-side fixing part 231, even when the circuit board's solder pad layout is predetermined (i.e., the gap between the signal and power contacts on the solder side is predetermined and cannot be changed), the power contacts can still be used to adjust the gap on the contact side to match the mating floating connector.

Although this invention is described and demonstrated with reference to preferred embodiments, it should be understood that many variations and modifications are possible for those skilled in the art to which this invention pertains, without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the disclosed embodiments, but rather to the textual description in the appended claims; that is, equivalent variations and modifications made without deviating from the claims should still fall within the scope of this invention.

10: Floating Connector 11: First Shell 110: Reception Space 12: Second Shell 120: Main Body 121: Limiting Block 1200: Fitting Slot 13: Signal Contact 14: Power Contact 15: U-shaped Metal Fitting D1: First Direction D2: Second Direction D3: Third Direction

Claims (7)

A floating connector includes a first housing, a second housing, a plurality of signal contacts, and a plurality of power contacts. The second housing has a mating portion that engages with a mating connector in a first direction. The second housing is mounted to the first housing in a manner movable in a plane perpendicular to the first direction. The plurality of signal contacts and the plurality of power contacts are arranged along a second direction perpendicular to the first direction. The plurality of power contacts are disposed on both sides of a group of signal contacts formed by the plurality of signal contacts and spaced apart from the group of signal contacts. Each signal contact includes: a signal-side fixing portion, a first signal-side holding portion, a signal-side spring portion, a second signal-side holding portion, and a signal-side contact portion. The first signal-side holding portion is held by the first housing, the second signal-side holding portion is held by the second housing, the first signal-side holding portion extends from the signal-side fixing portion, the signal-side spring portion connects the first signal-side holding portion and the second signal-side holding portion, and the signal-side contact portion extends from the second signal-side holding portion. Each power contact includes: a power-side fixing portion, a first power-side holding portion, a power-side spring portion, a second power-side holding portion, and a power-side contact portion. The first power-side holding portion is held by the first housing, the second power-side holding portion is held by the second housing, the first power-side holding portion extends from the power-side fixing portion, the power-side spring portion connects the first power-side holding portion and the second power-side holding portion, and the power-side contact portion extends from the second power-side holding portion. When viewed from a third direction perpendicular to both the first and second directions, the central axis of the power supply-side spring is offset inward in the second direction relative to the central axis of the power supply-side fixing part. When viewed from the third direction, the central axis of the power supply-side spring is offset inward in the second direction relative to the central axis of the power supply-side contact part. The floating connector of claim 1, wherein each signal contact has a first width and each power contact has a second width, the second width being greater than the first width. For example, the floating connector in claim 2, wherein the power supply side spring portion is formed with a plurality of elongated slits. The floating connector of claim 1, wherein the plurality of signal contacts and the plurality of power contacts are arranged in two columns along the second direction. The floating connector of any of claims 1 to 4, wherein when viewed from the second direction, the bending structure of the signal-side spring is different from the bending structure of the power-side spring. The floating connector of any of claims 1 to 4, wherein the extension length of the power-side spring is greater than the extension length of the signal-side spring. The floating connector of any of claims 1 to 4, wherein the signal-side spring portion has a signal-side vertical extension along the first direction, the power-side spring portion has a power-side vertical extension along the first direction, and when viewed from the second direction, the power-side vertical extension is offset inward relative to the signal-side vertical extension in the third direction.