Floating connector and board-to-board connector assembly comprising same

Abstract

The invention provides a floating connector and a board-to-board connector assembly comprising the floating connector. The floating connector includes a primary housing, a plurality of contacts, and a first secondary housing and a second secondary housing configured to be independently movable relative to the primary housing. Each contact piece comprises a first contact part, a first holding part, a first spring part, a second holding part, a second spring part, a third holding part and a second contact part. The first holding portion is held by the first secondary housing, the second holding portion is held by the primary housing, and the third holding portion is held by the second secondary housing. The first spring part is connected with the first holding part and the second holding part, and the second spring part is connected with the second holding part and the third holding part. The floating connector can be used for establishing electric connection between two separated circuit boards and can absorb positioning errors of the circuit boards or board-mounted connectors.

Description

Technical Field

[0001] The present invention relates to floating connectors, and more particularly to connectors having two independently movable floating members. Background Art

[0002] It is known to use a flexible flat cable and a board-mounted connector to establish an electrical connection between two separated circuit boards. However, when the installation space is limited or the distance between the two board-mounted connectors mounted on the circuit boards is very short, it may not be possible to use a flexible flat cable to establish an electrical connection between the two circuit boards.

[0003] Horizontal board-to-board connectors are also used to establish an electrical connection between two separate circuit boards. This type of horizontal board-to-board connector is disclosed, for example, in Taiwan Utility Model Patent M645087U. However, using this type of horizontal board-to-board connector presents the following problems. For example, if the mounting space does not allow the circuit board mounted with the horizontal board-to-board connector to move in the mating direction of the horizontal board-to-board connector, both circuit boards must be removed from their mounting position simultaneously to disengage the horizontal board-to-board connector or replace one of the two circuit boards. This increases the time required to replace the circuit board or connector. Summary of the Invention

[0004] One object of the present invention is to provide a floating connector that can bridge two board-mounted connectors respectively mounted on two circuit boards, thereby establishing an electrical connection between the two circuit boards.

[0005] Another object of the present invention is to provide a floating connector that can absorb positioning errors of a circuit board or a board-mounted connector.

[0006] Another object of the present invention is to provide a floating connector that can be disengaged without removing the circuit board, allowing each board-mounted connector or each circuit board to be independently removed or replaced.

[0007] According to an embodiment of the present invention, there is provided a floating connector, comprising:

[0008] The main housing includes a first receiving slot and a second receiving slot separated from each other;

[0009] a first secondary housing including a first engaging portion, at least a portion of the first secondary housing being received in the first receiving groove and the first secondary housing being configured to be movable relative to the main housing;

[0010] a second secondary housing including a second engaging portion, wherein at least a portion of the second secondary housing is received in the second receiving groove and the second secondary housing is configured to be movable relative to the main housing; and

[0011] a plurality of contact members, each of the contact members including a first contact portion, a first holding portion, a first spring portion, a second holding portion, a second spring portion, a third holding portion, and a second contact portion, the first contact portion extending from the first holding portion, the first holding portion being held by the first secondary housing, the second holding portion being held by the main housing, the first spring portion connecting the first holding portion and the second holding portion, the second contact portion extending from the third holding portion, the third holding portion being held by the second secondary housing, the second spring portion connecting the second holding portion and the third holding portion, the first contact portion being disposed on the first fitting portion, and the second contact portion being disposed on the second fitting portion;

[0012] Each of the first secondary housing and the second secondary housing is floatably supported by the plurality of contacts.

[0013] According to the floating connector of the present invention, the movement of the first secondary housing and the movement of the second secondary housing are independent of each other.

[0014] According to the floating connector of the present invention, the first receiving groove and the second receiving groove are arranged in parallel.

[0015] According to the floating connector of the present invention, the openings of the first receiving groove and the second receiving groove are located on the same side of the main housing.

[0016] According to the floating connector of the present invention, the first fitting portion of the first secondary housing and the second fitting portion of the second secondary housing are configured as socket-type fitting portions.

[0017] According to another embodiment of the present invention, a board-to-board connector assembly is provided, comprising a floating connector and two mating connectors, the two mating connectors being mounted on two separate circuit boards, the floating connector comprising:

[0018] The main housing includes a first receiving slot and a second receiving slot separated from each other;

[0019] a first secondary housing including a first engaging portion, at least a portion of the first secondary housing being received in the first receiving groove and the first secondary housing being configured to be movable relative to the main housing;

[0020] a second secondary housing including a second engaging portion, at least a portion of the second secondary housing being received in the second receiving groove and the second secondary housing being configured to be movable relative to the main housing, the movement of the first secondary housing being independent of the movement of the second secondary housing; and

[0021] a plurality of first contact members, each of the first contact members comprising a first contact portion, a first holding portion, a first spring portion, a second holding portion, a second spring portion, a third holding portion, and a second contact portion, the first contact portion extending from the first holding portion, the first holding portion being held by the first secondary housing, the second holding portion being held by the main housing, the first spring portion connecting the first holding portion and the second holding portion, the second contact portion extending from the third holding portion, the third holding portion being held by the second secondary housing, the second spring portion connecting the second holding portion and the third holding portion, the first contact portion being disposed on the first fitting portion, and the second contact portion being disposed on the second fitting portion;

[0022] wherein each of the first secondary housing and the second secondary housing is floatably supported by the plurality of first contacts;

[0023] One of the two mating connectors is engaged with the first secondary housing, and the other of the two mating connectors is engaged with the second secondary housing.

[0024] Each mating connector includes:

[0025] A mating housing, comprising a mating fitting portion, wherein the mating fitting portion is fitted with the first fitting portion of the first secondary housing or the second fitting portion of the second secondary housing;

[0026] a plurality of second contacts, each of which is held by the mating housing, wherein each second contact comprises a second contact portion, a fourth holding portion, and a soldering connection portion, the fourth holding portion extending from the soldering connection portion, the second contact portion extending from the fourth holding portion, the second contact portion being disposed in the mating engagement portion, and the fourth holding portion being held by the mating housing;

[0027] When the two mating connectors are engaged with the floating connector, the plurality of second contacts are in contact with the first contacts respectively, thereby establishing an electrical connection between the two circuit boards.

[0028] According to the board-to-board connector assembly of the present invention, each mating connector further includes a metal shell, which is assembled on the mating shell. The metal shell includes a plurality of elastic arms, and a locking protrusion is formed at the distal end of each elastic arm.

[0029] According to the board-to-board connector assembly of the present invention, each mating connector further includes a pair of metal brackets, which are respectively fixed at both ends of the mating shell, and the pair of metal brackets are integrally formed with the metal shell or formed separately from the metal shell.

[0030] According to the board-to-board connector assembly of the present invention, the mating fitting portion of the mating housing is configured as a plug-type fitting portion.

[0031] According to the board-to-board connector assembly of the present invention, the plug-type engaging portion is a tongue plate, the second contact portion is arranged on one side of the tongue plate, and a plurality of fixing protrusions are formed on the other side of the tongue plate. The mating connector further includes a pair of metal brackets, and the pair of metal bracket bodies are respectively fixed to the two ends of the mating shell.

[0032] A person having ordinary technical knowledge in the technical field to which the present invention belongs will be able to best understand the technical features and other objects and advantages of the present invention after referring to the specification and drawings of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. 1 is a perspective view of a board-to-board connector assembly according to a first embodiment of the present invention in a mated state.

[0034] Figure 2 FIG1 is a perspective view of the board-to-board connector assembly according to the present invention in an unmated state.

[0035] Figure 3 is a perspective view of a floating connector according to the present invention.

[0036] Figure 4 1 is an exploded perspective view of a floating connector according to the present invention.

[0037] Figure 5 is a front view of a floating connector according to the present invention.

[0038] Figure 6 It is along Figure 5 Section taken along the midline AA.

[0039] Figure 7 It is along Figure 5 Section taken along the midline BB.

[0040] Figure 8 is a perspective view of a mating connector according to the present invention.

[0041] Figure 9 is another perspective view of the mating connector according to the present invention.

[0042] Figure 10 1 is a perspective exploded view of a mating connector according to the present invention.

[0043] Figure 11 3 is a front view of the board-to-board connector assembly according to the present invention in a mating state.

[0044] Figure 12 It is along Figure 11 Section taken along the center line CC.

[0045] Figure 13 It is a perspective view of a modified example of the mating connector.

[0046] Figure 14 This is another perspective view of a modified example of the mating connector.

[0047] Figure 15 This is an exploded perspective view of a modified example of the mating connector.

[0048] Figure 16 FIG. 1 is a front view of a board-to-board connector assembly according to a second embodiment of the present invention in a mated state.

[0049] Figure 17 It is along Figure 16 Section taken along the midline DD.

[0050] Description of Reference Numerals

[0051] 1: Board-to-board connector assembly

[0052] 1': Board-to-board connector assembly

[0053] 10: Floating connector

[0054] 11: Main shell

[0055] 111: First housing part

[0056] 112 second housing part

[0057] 12: First secondary shell

[0058] 120: Ontology part

[0059] 1200: Chimeric part

[0060] 121: Limiting block

[0061] 13: Second secondary shell

[0062] 130: Ontology part

[0063] 1300: Chimeric part

[0064] 131: Limiting block

[0065] 14: Contact

[0066] 141: First contact portion

[0067] 142: First holding part

[0068] 143: First spring portion

[0069] 144: Second holding unit

[0070] 145: Second spring portion

[0071] 146: Third holding unit

[0072] 147: Second contact portion

[0073] 20: First mating connector

[0074] 21:Matching shell

[0075] 211: Tongue plate

[0076] 22:Metal shell

[0077] 222: First welding fixing portion

[0078] 223: Second welding fixing portion

[0079] 221:Metal bracket

[0080] 2211:Stent holding portion

[0081] 2212: Bracket welding fixing part

[0082] 224: Elastic arm

[0083] 2240:Fixing protrusion

[0084] 23: Contact

[0085] 231:Contact Department

[0086] 232:Maintaining

[0087] 233: Welding connection

[0088] 30: Second mating connector

[0089] 40: First mating connector

[0090] 41:Mating shell

[0091] 411: Tongue plate

[0092] 4110:Fixing protrusion

[0093] 42:Metal bracket

[0094] 421:Maintaining Department

[0095] 422: Bracket welding fixing part

[0096] 423: Bracket welding fixing part

[0097] 44: Welding fixed components

[0098] 441: Welding fixing part

[0099] 442:Maintaining part

[0100] 43: Contact

[0101] 431:Contact Department

[0102] 432:Maintaining part

[0103] 433: Welding connection

[0104] 50: Second mating connector

[0105] SP1: First storage slot

[0106] SP2: The second storage slot. DETAILED DESCRIPTION

[0107] The board-to-board connector assembly according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In each of the drawings, identical components or components having identical functions are denoted by identical reference numerals. The drawings are not drawn to scale.

[0108] Figure 1 FIG. 1 is a perspective view of a board-to-board connector assembly according to a first embodiment of the present invention in a mated state. Figure 2 : is a perspective view of a board-to-board connector assembly according to a first embodiment of the present invention in an unmated state. Figure 1 and Figure 2 , the components of the board-to-board connector assembly according to the first embodiment of the present invention are briefly described. The board-to-board connector assembly is generally indicated by reference numeral 1.

[0109] The board-to-board connector assembly 1 includes a floating connector 10, a first mating connector 20, and a second mating connector 30. The first mating connector 20 is mounted on a first circuit board P1 using surface mount technology, while the second mating connector 30 is mounted on a second circuit board P2 separate from the first circuit board P1 using surface mount technology. The floating connector 10 bridges the gap between the first and second mating connectors 20, 30, thereby establishing an electrical connection between the first and second circuit boards P1, P2. To accommodate positioning errors between the first and second circuit boards P1, P2, or the first and second mating connectors 20, 30, the floating connector 10 includes floating components (i.e., the first and second secondary housings described below) that provide floating support.

[0110] Reference Figure 3 and Figure 4 A floating connector 10 is described, wherein Figure 3 is a perspective view of the floating connector 10, Figure 4 This is a perspective exploded view of the floating connector 10. In order to facilitate the display of the features of the floating connector 10, Figure 3 and Figure 4 The floating connector 10 in Figure 1 or Figure 2The floating connector 10 is shown in an inverted state.

[0111] The floating connector 10 includes a main housing 11, a first sub-housing 12, a second sub-housing 13, and a plurality of contacts 14. The main housing 11, the first sub-housing 12, and the second sub-housing 13 are made of an insulating resin or polymer material by injection molding. The contacts 14 are made of copper or a copper alloy and are formed by stamping from a metal sheet.

[0112] The main housing 11 is composed of a first housing portion 111 and a second housing portion 112. The first housing portion 111 and the second housing portion 112 are joined to each other by a snap-fit structure. The main housing 11 is provided with a first receiving groove SP1 and a second receiving groove SP2 that are spaced apart in parallel with each other. The first secondary housing 12 and the second secondary housing 13 are respectively received in the first receiving groove SP1 and the second receiving groove SP2. The first secondary housing 12 and the second secondary housing 13 can be completely received in the first receiving groove SP1 and the second receiving groove SP2, respectively, or can be partially received in the first receiving groove SP1 and the second receiving groove SP2, respectively. A gap is maintained between the first receiving groove SP1 and the first secondary housing 12, allowing the first secondary housing 12 to move relative to the main housing 11 in the first receiving groove SP1 on a plane perpendicular to the mating direction of the mating connector (i.e., a plane parallel to the first circuit board P1 or the second circuit board P2). A gap is maintained between the second receiving groove SP2 and the second secondary shell 13, allowing the second secondary shell 13 to move relative to the main shell 11 in the second receiving groove SP1 on a plane perpendicular to the mating direction of the mating connector (i.e., a plane parallel to the first circuit board P1 or the second circuit board P2).

[0113] Figure 5 is a front view of the floating connector 10 . Figure 6 It is along Figure 5 Section taken along the midline AA. Figure 7 It is along Figure 5 Section taken along the midline BB.

[0114] The first secondary housing 12 includes a main body 120 and stopper protrusions 121 formed at both ends of the main body 120. The main body 120 also includes a mating portion 1200. The second secondary housing 13 includes a main body 130 and stopper protrusions 131 formed at both ends of the main body 130. The main body 130 also includes a mating portion 1300. The stopper protrusions 121 and 131 control the range of movement of the first and second secondary housings 12 and 13. Interference between the main housing 11 and the stopper protrusions 121 and 131 prevents the first and second secondary housings 12 and 13 from being separated from the main housing 11. Both the mating portions 1200 and 1300 are designed as socket-type mating portions.

[0115] like Figure 7 As shown, each contact member 14 includes a first contact portion 141, a first retaining portion 142, a first spring portion 143, a second retaining portion 144, a second spring portion 145, a third retaining portion 146, and a second contact portion 147. The first contact portion 141 extends from the first retaining portion 142, which is retained by the first secondary housing 12. The second retaining portion 144 is retained by the main housing 11. The first spring portion 143 connects the first retaining portion 142 and the second retaining portion 144. The second contact portion 147 extends from the third retaining portion 146, which is retained by the second secondary housing 13. The second spring portion 145 connects the second retaining portion 144 and the third retaining portion 146. In this way, the first and second secondary housings 12, 13 are floatingly and elastically supported by the contact members 14. The movement of the first secondary housing 12 is independent of the movement of the second secondary housing 13. The first contact portion 141 is disposed on the first mating portion 1200, and the second contact portion 147 is disposed on the second mating portion 1300. When the first mating connector 20 is mated with the first mating portion 1200 and the second mating connector 30 is mated with the second mating portion 1300, an electrical connection is established between the first mating connector 20 and the second mating connector 30 via the contacts 14 of the floating connector 10.

[0116] Reference Figures 8 to 10 The first mating connector 20 is described, wherein Figure 8 is a perspective view of the mating connector 20, Figure 9 is another perspective view of the mating connector 20, and Figure 10 It is an exploded perspective view of the mating connector 20. In principle, the structure of the second mating connector 30 is the same as that of the first mating connector 20, so the description of the second mating connector 30 is omitted.

[0117] The first mating connector 20 includes a mating housing 21, a metal shell 22 mounted on the mating housing 21, and a plurality of contacts 23 held by the mating housing 21. The mating housing 21 includes a tongue plate 211 as a plug-type mating mating portion. The tongue plate 211 is to be mated with the first mating portion 1200 of the first secondary housing 12.

[0118] Each contact 23 includes a contact portion 231, a retaining portion 232, and a solder connection portion 233. The retaining portion 232 extends from the solder connection portion 233, while the contact portion 231 extends from the retaining portion 232 and is disposed on the tongue plate 211. The retaining portion 232 is retained by the mating housing 21. The metal housing 22 is mounted on one side of the tongue plate 211, while the contact portion 231 is disposed on the other side of the tongue plate 211.

[0119] like Figure 8 and Figure 10As shown, the metal housing 22 has two first welding fixing portions 222 and two second welding fixing portions 223 integrally formed at the lower edge. Two metal brackets 221 are integrally formed at each end of the metal housing 22. Each metal bracket 221 is roughly configured in an inverted U-shape. Each metal bracket 221 has a bracket retaining portion 2211 and a bracket welding fixing portion 2212. The bracket retaining portion 2211 is fixed to the mating housing 21 in an interference fit manner. The first mating connector 20 is securely fixed to the first circuit board P1 by soldering the first welding fixing portion 222, the second welding fixing portion 223, and the bracket welding fixing portion 2212 to the solder pads on the first circuit board P1. The metal housing 22 further has a plurality of elastic arms 224. A locking protrusion 2240 is formed at the distal end of each elastic arm 224. During the process of mating the floating connector 10 with the first mating connector 20 or during the process of detaching the floating connector 10 from the first mating connector 20, the locking protrusion 2240 interferes with the main housing 11 of the floating connector 10, preventing the floating connector 10 from being detached from the first mating connector 20. In this embodiment, the metal shell 22 also serves as a reinforcement for the mating housing 21, preventing deformation or warping of the mating housing 21.

[0120] Figure 11 It is a front view of the board-to-board connector assembly 1 in the mating state. Figure 12 It is along Figure 11 The cross section is taken from the center line CC. Figure 12 As shown, in the mated state, the contacts of the first mating connector 20 contact one end of the contacts of the floating connector 10, and the contacts of the second mating connector 30 contact the other end of the contacts of the floating connector 10. The floating connector 10 bridges the first mating connector 20 and the second mating connector 30, thereby establishing an electrical connection between the first circuit board P1 and the second circuit board P2.

[0121] Reference Figures 13 to 15 A modified example of a mating connector is described, wherein Figure 13 is a perspective view of a modified example of a mating connector. Figure 14 is another perspective view of a modified example of the mating connector, Figure 15 4 is an exploded perspective view of a modified example of the mating connector. A first mating connector as a modified example of the mating connector is denoted as a whole by reference numeral 40 .

[0122] The first mating connector 40 includes a mating housing 41, a pair of metal brackets 42 disposed at either end of the mating housing 41, and a plurality of contacts 43 held by the mating housing 41. The mating housing 41 includes a tongue plate 411, which serves as a plug-type mating engagement portion. Each contact 43 includes a contact portion 431, a retaining portion 432, and a solder connection portion 433. The retaining portion 432 extends from the solder connection portion 433, while the contact portion 431 extends from the retaining portion 432 and is disposed on the tongue plate 411. The retaining portion 432 is retained by the mating housing 41.

[0123] Each metal bracket 42 is generally configured in an inverted U-shape and includes a retaining portion 421 and a pair of bracket welding fixing portions 422 and 423. The retaining portion 421 is fixed to the mating housing 41 in an interference fit manner.

[0124] The first mating connector 40 further includes a pair of soldering fixtures 44. Each soldering fixture 44 includes a soldering portion 441 and a retaining portion 442. The retaining portion 442 is retained by the mating housing 41. The first mating connector 40 is securely secured to the first circuit board P1 by soldering the bracket soldering fixtures 422 and 423 and the soldering fixtures 441 to solder pads on the first circuit board P1.

[0125] The contact portion 431 is disposed on one side of the tongue plate 411 , while the other side of the tongue plate 411 is integrally formed with a plurality of locking protrusions 4110 . The role and function of the locking protrusions 4110 are substantially the same as those of the locking protrusions 2240 formed on the metal housing 22 of the first mating connector 20 .

[0126] Figure 16 4 is a front view of a board-to-board connector assembly according to a second embodiment of the present invention in a mated state. Figure 17 It is along Figure 16 The board-to-board connector assembly according to the second embodiment of the present invention is generally denoted by reference numeral 1 ′.

[0127] The board-to-board connector assembly 1' includes a floating connector 10, a first mating connector 40, and a second mating connector 50. The second mating connector 50 has the same structure as the first mating connector 40, so its description is omitted.

[0128] like Figure 17 As shown, in the mated state, the contacts of the first mating connector 40 contact one end of the contacts of the floating connector 10, and the contacts of the second mating connector 50 contact the other end of the contacts of the floating connector 10. The floating connector 10 bridges the first mating connector 40 and the second mating connector 50, thereby establishing an electrical connection between the first circuit board P1 and the second circuit board P2.

[0129] According to a preferred embodiment of the present invention, the first mating connector 20 and the second mating connector 30 (or the first mating connector 40 and the second mating connector 50) are configured identically. However, according to other embodiments of the present invention, the board-to-board connector assembly may include first and second mating connectors having different configurations. Furthermore, the first mating connector 20 and, as a modified example, the first mating connector 40 may be interchangeable.

[0130] Although the first and second secondary housing engagement portions are both configured as receptacle engagement portions, and the first and second mating connector engagement portions are both configured as plug engagement portions, the present invention is not limited thereto. If desired, the first or second secondary housing engagement portion may be configured as a plug engagement portion, and the first or second mating connector engagement portion may be configured as a receptacle engagement portion.

[0131] Although the present invention has been described with reference to preferred embodiments, it should be understood that numerous variations and modifications are possible for those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the disclosed embodiments but is subject to the text of the claims. Equivalent variations and modifications that do not depart from the scope of the claims are intended to be encompassed by the present invention.

Claims

1. A floating connector, characterized in that: include: The main housing includes a first receiving slot and a second receiving slot separated from each other; a first secondary housing including a first engaging portion, at least a portion of the first secondary housing being received in the first receiving groove and the first secondary housing being configured to be movable relative to the main housing; a second secondary housing including a second engaging portion, wherein at least a portion of the second secondary housing is received in the second receiving groove and the second secondary housing is configured to be movable relative to the main housing; and a plurality of contact members, each of the contact members including a first contact portion, a first holding portion, a first spring portion, a second holding portion, a second spring portion, a third holding portion, and a second contact portion, the first contact portion extending from the first holding portion, the first holding portion being held by the first secondary housing, the second holding portion being held by the main housing, the first spring portion connecting the first holding portion and the second holding portion, the second contact portion extending from the third holding portion, the third holding portion being held by the second secondary housing, the second spring portion connecting the second holding portion and the third holding portion, the first contact portion being disposed on the first fitting portion, and the second contact portion being disposed on the second fitting portion; Each of the first secondary housing and the second secondary housing is floatably supported by the plurality of contacts. 2 . The floating connector as claimed in claim 1 , wherein the movement of the first secondary housing and the movement of the second secondary housing are independent of each other. 3 . The floating connector as claimed in claim 2 , wherein the first receiving groove and the second receiving groove are arranged in parallel. 4 . The floating connector according to claim 1 , wherein the openings of the first receiving groove and the second receiving groove are on the same side of the main housing. 5 . The floating connector according to claim 1 , wherein the first fitting portion of the first secondary housing and the second fitting portion of the second secondary housing are configured as socket-type fitting portions.

6. A board-to-board connector assembly comprising a floating connector and two mating connectors, wherein the two mating connectors are mounted on two separate circuit boards, wherein: The floating connector includes: The main housing includes a first receiving slot and a second receiving slot separated from each other; a first secondary housing including a first engaging portion, at least a portion of the first secondary housing being received in the first receiving groove and the first secondary housing being configured to be movable relative to the main housing; a second secondary housing including a second engaging portion, wherein at least a portion of the second secondary housing is received in the second receiving groove and the second secondary housing is configured to be movable relative to the main housing, and the movement of the first secondary housing is independent of the movement of the second secondary housing; and a plurality of first contact members, each of the first contact members comprising a first contact portion, a first holding portion, a first spring portion, a second holding portion, a second spring portion, a third holding portion, and a second contact portion, the first contact portion extending from the first holding portion, the first holding portion being held by the first secondary housing, the second holding portion being held by the main housing, the first spring portion connecting the first holding portion and the second holding portion, the second contact portion extending from the third holding portion, the third holding portion being held by the second secondary housing, the second spring portion connecting the second holding portion and the third holding portion, the first contact portion being disposed on the first fitting portion, and the second contact portion being disposed on the second fitting portion; wherein each of the first secondary housing and the second secondary housing is floatably supported by the plurality of first contacts; One of the two mating connectors is engaged with the first secondary housing, and the other of the two mating connectors is engaged with the second secondary housing. Each mating connector includes: A mating housing, comprising a mating fitting portion, wherein the mating fitting portion is fitted with the first fitting portion of the first secondary housing or the second fitting portion of the second secondary housing; a plurality of second contacts, each of which is held by the mating housing, wherein each second contact comprises a second contact portion, a fourth holding portion, and a soldering connection portion, the fourth holding portion extending from the soldering connection portion, the second contact portion extending from the fourth holding portion, the second contact portion being disposed in the mating engagement portion, and the fourth holding portion being held by the mating housing; When the two mating connectors are engaged with the floating connector, the plurality of second contacts are in contact with the first contacts respectively, thereby establishing an electrical connection between the two circuit boards.

7. The board-to-board connector assembly as described in claim 6, wherein each mating connector further includes a metal shell, the metal shell is assembled on the mating shell, the metal shell includes a plurality of elastic arms, and a locking protrusion is formed at the distal end of each elastic arm.

8. The board-to-board connector assembly as described in claim 7, wherein each mating connector further includes a pair of metal brackets, the pair of metal bracket bodies are respectively fixed to the two ends of the mating shell, and the pair of metal bracket bodies are integrally formed with the metal shell or formed separately from the metal shell. 9 . The board-to-board connector assembly according to claim 7 , wherein the mating mating portion of the mating housing is configured as a plug-type mating portion.

10. The board-to-board connector assembly as described in claim 9, wherein the plug-type engaging portion is a tongue plate, the second contact portion is arranged on one side of the tongue plate, and a plurality of fixing protrusions are formed on the other side of the tongue plate, and the mating connector further includes a pair of metal brackets, and the pair of metal bracket bodies are respectively fixed to the two ends of the mating shell.

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