A board-to-board male connector and a matching board-to-board female connector

Abstract

The present invention relates to the technical field of board-to-board electrical connectors, and provides a board-to-board male connector and a board-to-board female connector adapted therewith, wherein: the board-to-board male connector includes an insulator and an electrical contact, and the insulator has a ridge portion at both ends for raising a rectangular body, the rectangular body is provided with a buckle groove, a tongue plate is raised in the buckle groove, and contact grooves are arranged on two opposite surfaces of the tongue plate; a ventilation groove is provided on the rectangular body opposite to the buckle groove, and the contact groove is directly connected to the ventilation groove; a serrated portion is formed under the rectangular body, a protrusion is formed between adjacent serrated portions, and a gap is formed between the protrusion and the serrated portion; a step surface is formed on the ridge portion and the bottom of the rectangular body, so that when the insulator is adapted to the PCB board, the serrated portion and the PCB board have a gap connecting the ventilation groove. The above-mentioned structure solves the technical problem of small covering surface when the electrical contact is installed on the insulator, and achieves the effect of improving product performance.

Description

Technical Field

[0001] The invention provides a board-to-board male-end connector and a board-to-board female-end connector adapted thereto. Background Art

[0002] Existing board-to-board connectors are small in size and densely packed with conductive parts, so the industry has developed a method where the terminals are embedded in a mold and "press-molded" to form an integral part. The advantage of such a press-molded board-to-board connector is its good stability. However, there are also disadvantages. For example, the colloid formed into an integral part by the press-molding causes the terminal to be too tightly covered, which is not conducive to reducing impedance. To solve the problem of reduced impedance, the inventors combined traditional plug-in (assembly) technology to strengthen the design of the force position of the terminal joint surface, minimize the covering of the terminal (surface), and leave ventilation space in the non-joined position of the terminal. This design can not only reduce the high cost of press-molding, but also reduce electrical impedance. At the same time, by strengthening the joint force, the stability effect and plug-in failure rate are improved. Summary of the Invention

[0003] In order to solve the above technical problems, the main purpose of the present invention is to provide a board-to-board male connector.

[0004] In order to achieve the above object, the technical solution applied by the present invention is:

[0005] Provided is a board-to-board male connector adapted for use with a PCB and comprising an insulator and electrical contacts secured to the insulator. The insulator comprises a rectangular body and a ridge portion that raises the rectangular body at both ends. The rectangular body is formed with a buckle groove, a tongue plate protruding in the center of the bottom of the buckle groove, and contact grooves are arranged on opposite sides of the tongue plate. Ventilation grooves corresponding to the tongue plates are formed in the buckle grooves opposite to each other in the rectangular body, and the contact grooves are directly connected to the venting grooves. Sawtooth portions are formed below the rectangular body, respectively, near two opposite outer side surfaces. Bumps protruding from the bottom of the rectangular body are formed between adjacent serrated portions, and gaps are formed between the bumps and the serrated portions. The ridge portion extends toward the bottom of the rectangular body to form a step surface. The serrated portion is greater than the height of the bump but lower than the height of the step surface, so that when the insulator is adapted to the PCB board, a gap connecting the serrated portion and the PCB board to the venting groove exists.

[0006] In this embodiment, preferably: the two opposite side walls of the buckle groove extend upward to form a clamping wall that is greater than the height of the two opposite end walls of the buckle groove, and the tongue plate is equal to or greater than the end wall height but less than the clamping wall height in the buckle groove, wherein: the outer side surface of the clamping wall is horizontal with the outer side surface of the rectangular body, and the inner side surface of the clamping wall is horizontal with the inner wall surface of the buckle groove.

[0007] In this embodiment, it is preferred that: the insulator is divided into an upper buckle groove part, a middle solid part and a lower air groove part, and a contact hole directly passing through the contact groove is provided in the solid part, and the contact hole passes through the ventilation groove; a material removal hole is formed on the bottom of the buckle groove under the rectangular body, and the material removal holes are arranged between the ventilation groove and the serrated part, and the depth of the material removal hole is limited to the height of the air groove part.

[0008] In this embodiment, it is preferred that the electrical contact includes a contact pair, which is composed of two contacts with a mirror-image structure, wherein each contact includes a fixed section, a contact section and a welding section, the fixed section is connected between the connecting leg portion and the connecting contact portion, the contact section is divided into a flat contact portion and an oblique contact portion, the welding section is divided into a bent portion and a welding leg, and the welding leg has a veneer.

[0009] In this embodiment, it is preferred that: the width of the bending portion is equal to the width of the connecting contact portion but smaller than the width of the connecting foot portion, an interference portion is formed between the connecting contact portion and the flat contact portion, burrs are formed on both sides of the interference portion, bulges are extended on both sides of the oblique contact portion, the burrs interfere with both sides of the contact hole in the contact hole, and the bulges interfere with both sides of the contact groove, so that the contact is firmly fixed in the insulator.

[0010] In order to solve the above technical problems, the main purpose of the present invention is to provide a board-to-board female connector.

[0011] In order to achieve the above object, the technical solution applied by the present invention is:

[0012] Provided is a board-to-board female connector, which is mounted on a circuit board and includes an insulating seat adapted to fit a terminal piece in the insulating seat. The insulating seat is die-formed and includes a main body and mirror-image pads formed at both ends of the main body. The main body is provided with a tongue plate groove, and the opposite walls of the tongue plate groove are respectively provided with terminal grooves for installing the terminal piece; the bottom of the main body of the opposite terminal grooves is indented to form a recessed portion, and the recessed portions are respectively provided with terminal holes corresponding to and directly through each terminal groove, and the terminal hole has an inner groove connecting the recessed portion to the terminal groove; the pad extends outward near the bottom of the main body and extends as a whole beyond the bottom of the pad under the main body, and the lower surface of the main body forms an indented space relative to the lower surface of the pad, and the indented space is connected to the terminal groove through the inner groove.

[0013] In this embodiment, it is preferred that the terminal piece is stamped and includes a terminal pair, and the terminal pair is composed of two terminals of mirror-image structure, wherein: each terminal includes a holding portion, an elastic section, an elastic contact portion and a welding foot, and the welding foot is connected to the lower end of the holding portion and forms a 90° angle with the holding portion. 0 to 95 0 ; The elastic section includes a first elastic section and a second elastic section, the first elastic section is connected to the upper end of the retaining portion and extends obliquely, and the second elastic section is connected to the elastic contact portion.

[0014] In this embodiment, preferably, the retaining portion interferes with the terminal hole in the terminal hole to secure the terminal in the insulating seat, and the elastic section tilts toward the notch in the terminal slot so that the elastic contact portion protrudes into the tongue plate slot.

[0015] In this embodiment, it is preferred that: the circuit board has a soldering pad that adapts to the terminal welding foot, and when the terminal adapts to the insulating seat, the soldering foot extends to the corresponding outer side of the insulating seat through the recessed portion, and when the board-to-board female end connector adapts to the circuit board, adjacent soldering feet form a spacing, and the spacing is connected to the terminal groove through the indented space and the inner groove.

[0016] In order to solve the above technical problems, the main purpose of the present invention is to provide a board-to-board male connector and a matching board-to-board female connector.

[0017] In order to achieve the above object, the technical solution applied by the present invention is:

[0018] A board-to-board male connector and a board-to-board female connector that are compatible with the PCB board are provided. The male connector is compatible with the PCB board and includes an insulator and an electrical contact that is fixed to the insulator. The insulator has a rectangular body and a ridge that raises the rectangular body at both ends of the rectangular body. The rectangular body is formed with a buckle groove, and a tongue plate is raised in the center of the bottom of the buckle groove. Contact grooves for the contacts to adapt are arranged on two opposite surfaces of the tongue plate; the buckle grooves on the back of the rectangular body are formed with ventilation grooves corresponding to the tongue plates, and the contact grooves are directly connected to the ventilation grooves through contact holes, and the contact holes are formed with gaps connecting the buckle grooves and the ventilation grooves; serrated portions are formed near two opposite outer sides of the rectangular body, and protrusions protruding from the bottom of the rectangular body are formed between adjacent serrated portions, and a gap is formed between the protrusions and the serrated portions; the ridge expands toward the bottom of the rectangular body to form a step surface, and the serrated portion is larger than the height of the protrusion but lower than the height of the step surface, so that when the insulator adapts to the PCB board, the serrated portion and the PCB The board has a gap connected to the ventilation groove; the board-to-board female end connector is installed on the circuit board and includes an insulating seat adapted to the terminal piece in the insulating seat, the insulating seat is die-cast and includes a main body and a mirror-image pad formed at both ends of the main body, the main body is provided with a tongue plate groove for inserting the tongue plate, and the opposite walls of the tongue plate groove are respectively provided with terminal grooves for installing the terminal piece; the bottom of the main body of the opposite terminal groove is indented to form a recessed portion, and the recessed portions are respectively provided with terminal holes corresponding to and directly through each terminal groove, and the terminal hole has an inner groove connecting the recessed portion to the terminal groove; the pad expands outward near the bottom of the main body and extends as a whole beyond the bottom of the pad under the main body, and an indented space is formed on the lower surface of the main body relative to the lower surface of the pad, and the indented space is connected to the terminal groove through the inner groove. When the board-to-board male end connector is adapted to the board-to-board female end connector, the contact and the terminal form an electrical path, and the indented space is connected to the gap through the terminal groove, so that the gap is connected to the gap through the ventilation groove.

[0019] Compared with the prior art, the present invention has the following beneficial effects: first, the impedance is reduced and product performance is improved by reserving ventilation space in the design; second, the product yield is controlled by strengthening the effective force of the structural joints between components; third, the reasonable design of the material removal position can not only solve the demoulding problem, but also avoid deformation (warping) of the product after demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the male connector of this embodiment adapted to the PCB board.

[0021] Figure 2 Schematic diagram of the male connector and PCB board in this embodiment.

[0022] Figure 3 Schematic diagram of the separation of the insulator and the electrical contact in the male connector of this embodiment.

[0023] Figure 4 It is a three-dimensional schematic diagram of the male connector of this embodiment from another perspective.

[0024] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the insulator of the middle male connector.

[0025] Figure 6 yes Figure 3 An enlarged schematic diagram of the contact pair in the China Electric Contact.

[0026] Figure 7 It is a front view of the male connector of this embodiment.

[0027] Figure 8 yes Figure 3 Enlarged schematic diagram of the insulator C in the middle.

[0028] Figure 9 yes Figure 7 Cross-section of AA.

[0029] Figure 10 yes Figure 7 Cross-section of the BB.

[0030] Figure 11 yes Figure 7 Enlarged schematic diagram of C1 in the middle.

[0031] Figure 12 yes Figure 10 Enlarged schematic diagram of C2 in the middle.

[0032] Figure 13 This is a schematic diagram of the female connector adapting to the circuit board in this embodiment.

[0033] Figure 14 This is a separate schematic diagram of the female connector and the circuit board in this embodiment.

[0034] Figure 15 It is a three-dimensional schematic diagram of the female connector adapting to the circuit board of this embodiment.

[0035] Figure 16 It is an enlarged three-dimensional schematic diagram of the insulating seat of the female connector.

[0036] Figure 17 yes Figure 16 A three-dimensional diagram from another perspective.

[0037] Figure 18 It is an enlarged three-dimensional schematic diagram of the terminal pair in this embodiment.

[0038] Figure 19 This is a schematic diagram of the mating surface (matching with the circuit board) of the female connector of this embodiment.

[0039] Figure 20 yes Figure 13 Cross-section of CC.

[0040] Figure 21 yes Figure 13 Cross-section of the DD.

[0041] Figure 22 yes Figure 21 Magnified view of the circled location. DETAILED DESCRIPTION

[0042] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0043] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0044] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. As used herein, "one" not only means "only one" but also "more than one."

[0045] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0046] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and rear) used to explain the structure and movement of various components of the present invention are not absolute but relative. These descriptions are applicable when the components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, the directional indications will also change accordingly.

[0047] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0049] In this embodiment, if Figures 1 to 12 , the figure provides a board-to-board male connector 100, which is adapted to a PCB board 200. The board-to-board male connector includes a molded insulator 10, which secures an electrical contact 20, wherein:

[0050] The insulator 10 has a rectangular body 11 and a pad base (or "shield") 12 formed at both ends of the rectangular body in a raised (or "raised") form. The upper surface of the rectangular body 11 is hollowed out downward to form a buckle groove 113. A tongue plate 114 is raised in the center of the bottom of the buckle groove 113. The tongue plate 114 has contact grooves 1141 arranged on two opposite sides respectively; the lower surface of the rectangular body 11 is hollowed out upward to form a ventilation groove 115 corresponding to the tongue plate 114, and the contact groove 1141 is directly connected to the ventilation groove 115 downward; the shield 12 is extended outward near the lower surface of the rectangular body so that the distance between the two opposite outer sides of the shield is greater than the distance between the two opposite outer sides of the rectangular body. In this example, the expansion (i.e., "widening") design of the shield is conducive to adapting to the PCB board, and the shield is extended to the bottom of the rectangular body (beyond the bottom of the rectangular body) to form a step surface (not marked), which is adapted to the PCB board so that a ventilation distance is formed between the bottom of the rectangular body and the PCB board. In this example, the insulator can be divided into three parts longitudinally (i.e., the buckle groove part at the top, the solid part in the middle, and the air groove part at the bottom). The contact groove 1141 passes directly through the contact hole (not marked) formed in the solid part, and the contact hole passes through the ventilation groove 115. In this example, under the rectangular body, there are respectively arranged (anti-shrinkage deformation) material holes 116 between the two outer side surfaces of the rectangular body and the ventilation groove 115. A serration 1151 is formed between the material hole 116 and the outer side surface. A protrusion 1152 protruding from the bottom of the rectangular body is formed between adjacent serrations. A gap (not marked) is formed between the protrusion and the serration. The serration is larger than the height of the protrusion but lower than the step surface, so that there is a gap between the serration and the matching surface of the PCB board of the insulator. The protrusion is consistent with the width of the contact foot and the parallel spacing with the serration is consistent with the thickness of the contact foot. In this example, the two opposing side walls of the buckle groove extend upward to form a clamping wall 111 that is greater than the height of the two opposing end walls of the buckle groove. The tongue plate is equal to or greater than the end wall height within the buckle groove, but less than the clamping wall height. In this example, the outer side of the clamping wall is parallel to the outer side of the rectangle, and the inner side of the clamping wall is parallel to the inner wall of the buckle groove.

[0051] The electrical contact 20 includes several contact pairs 21. For ease of description, one contact pair 21 is used as an example, and the individual contacts within the contact pair (mirror image structure) are labeled. In this example, the contact 21 consists of three parts: a fixed section 211, a contact section 212, and a welding section 213. The fixed section 211 is divided into a connecting leg portion 2111 and a connecting contact portion 2112; the contact section 212 is divided into a flat contact portion 2121 and an angled contact portion 2122; and the welding section 213 is divided into a bent portion 2131 and a welding leg 2132. The welding leg 2132 has a facing surface 2133. In this example, the bending portion is located between the welding foot and the connecting foot portion so that the welding section is perpendicular to the fixed section; the width of the bending portion is equal to the width of the connecting contact portion but smaller than the width of the connecting foot portion. The wider width of the connecting foot portion can enhance the force on the contact during adaptation to avoid damage when installed in the insulator, thereby effectively improving the product yield; an interference portion 2113 is formed between the connecting contact portion and the flat contact portion, and burrs (not marked) are formed on both sides of the interference portion. The maximum width formed between the burrs on both sides conforms to the two opposite groove walls (not marked) of the interference contact groove 1141 and can stabilize the contact in the contact groove; convex portions (not marked) are extended on both sides of the oblique contact portion, and the width of the convex portions conforms to the two opposite groove walls of the interference contact groove, thereby assisting the stability of the contact in the contact groove. The width of the oblique contact portion is greater than the width of the flat contact portion but less than or equal to the interference portion. In this example, the narrower connecting contact portion and the flat contact portion in the contact form a gap in the contact slot, so that the connecting contact portion and the flat contact portion have as little (or no) contact with the contact slot wall as possible, thereby reducing impedance and improving electrical transmission effect.

[0052] In this example, please continue to see Figures 1 to 12In the figure, the board-to-board male connector 100 is adapted to the pads 201 arranged on the body 201 of the PCB 200 by adapting the contact surfaces 2133 of the electrical contacts 20 to form an integral body with the PCB 200. Due to the design, the insulator 10 comprises a rectangular body 11 and a raised (or "raised") base portion (or "shield") 12 formed at both ends of the rectangular body. The upper surface of the rectangular body 11 is hollowed out to form a buckle groove 113. A tongue plate 114 protrudes from the center of the bottom of the buckle groove 113. The tongue plate 114 has contact grooves 1141 arranged on two opposing sides. A ventilation groove 115 is hollowed out upward on the lower surface of the rectangular body 11, corresponding to the tongue plate 114. The contact grooves 1141 extend downwardly through the ventilation groove 115. The shield 12 extends outward near the bottom of the rectangular body, so that the distance between the two opposing outer sides of the shield is greater than the distance between the two opposing outer sides of the rectangular body. In this example, the expanded (i.e., "widened") design of the sill portion facilitates adaptation to the PCB board, and the sill portion extends toward the bottom of the rectangular body (beyond the bottom of the rectangular body) to form a step surface (not labeled). The step surface adapts to the PCB board to create a ventilation gap between the bottom of the rectangular body and the PCB board. In this example, the insulator can be divided longitudinally into three parts (i.e., the upper buckle groove portion, the middle solid portion, and the lower air groove portion). The contact groove 1141 extends directly through the contact hole (not labeled) formed in the solid portion. The contact hole passes through the air groove 115 and forms a gap hole connecting the buckle groove and the air groove (not shown). In this example, under the rectangular body, there are respectively arranged (anti-shrinkage deformation) material holes 116 between the two outer side surfaces of the rectangular body and the ventilation groove 115. A serration 1151 is formed between the material hole 116 and the outer side surface. A protrusion 1152 protruding from the bottom of the rectangular body is formed between adjacent serrations. A gap (not marked) is formed between the protrusion and the serration. The serration is greater than the height of the protrusion but lower than the step surface, so that there is a gap between the serration and the matching surface of the PCB board. The protrusion is consistent with the width of the contact foot and the parallel spacing with the serration is consistent with the thickness of the contact foot. In this example, the two opposite side walls of the buckle groove extend upward to form a clamping wall 111 that is greater than the height of the two opposite end walls of the buckle groove. The tongue plate is equal to or greater than the end wall height in the buckle groove but less than the clamping wall height. In this example, the outer side surface of the clamping wall is horizontal with the outer side surface of the rectangular body, and the inner side surface of the clamping wall is horizontal with the inner wall surface of the buckle groove.

[0053] In this embodiment, if Figures 13 to 22 As shown in the figure, a board-to-board female connector is shown. The board-to-board female connector 300 is mounted on a circuit board 400 and includes an insulating seat 30 and a terminal member 40 provided in the insulating seat 30, wherein:

[0054] Insulation seat 30 (such as Figure 14 、 Figure 16 and Figure 17) is die-formed, and has a longitudinal main body (hereinafter referred to as the "main body") 31 and end pads (hereinafter referred to as the "pads") 35 that are expanded at both ends of the main body 31 to form mirror images. The main body has an upper surface 311, a lower surface 312, a front surface 313, a rear surface 114 and two (opposite) side surfaces 315. A tongue plate groove 32 for adapting the tongue plate 114 of the male connector 100 is formed from the upper surface 311 to the lower surface 312 of the main body 31, and terminal grooves 321 for installing the terminal piece 40 are respectively provided on the opposite walls of the tongue plate groove 32; the lower surface 312 of the main body is retracted upward to form a recessed portion 33, and terminal holes 34 corresponding to and directly through each terminal groove 321 are respectively provided in the recessed portion, and a communicating inner groove 341 is provided on the inner side of the terminal hole 34. The pad 35 extends beyond the exterior of the main body 31 (e.g., the front surface 313, rear surface 114, side surfaces 315, and lower surface 312), creating a ventilated recessed space G between the main body's lower surface 312 and the pad's lower surface 351. This recessed space G communicates with the inner groove 341. Positioning posts 36 are provided on the pad's lower surface. The two posts are of different sizes to prevent the board-to-board female connector 300 from being incorrectly oriented when mounted on the circuit board 400. The side of the main body 31 features an inwardly retracted structure to prevent mis-insertion of the mating male connector 100.

[0055] The terminal piece 40 is formed by stamping and includes a plurality of terminal pairs (not marked). Each terminal pair is composed of terminals symmetrically arranged in the insulating seat 30. Each terminal includes a holding portion 41, an elastic section 42, an elastic contact portion 43 and a welding leg 44. The welding leg is connected to the lower end of the holding portion and forms a 90-degree bending angle with the holding portion. 0 to 95 0 The elastic segment includes a first elastic segment 421 and a second elastic segment 422. The first elastic segment 421 connects to the upper end of the retaining portion 41 and extends obliquely. The second elastic segment 422 connects to the elastic contact portion 43. In this example, the retaining portion 41 interferes with the terminal hole 341 in the terminal hole 341, firmly securing the terminal in the insulating seat. At this time, the elastic segment 42 (free end) in the terminal slot 321 tilts toward the slot, causing the elastic contact portion 43 to protrude from the tongue plate slot 321, thereby adapting to the contact segment 212 of the contact 21 of the male connector 100.

[0056] In this embodiment, if Figures 13 to 16 and Figures 19 to 22In the figure, the board-to-board female connector 300 is arranged on the circuit board 400. The circuit board 400 is provided with corresponding through holes 401 relative to the positioning columns 36 at both ends of the board-to-board female connector 300. Between the two through holes 401, there is provided a soldering pad 402 for soldering the soldering feet 44 of the terminal piece 40. The soldering feet 44 extend to the corresponding outer side of the insulating seat through the recessed portion 33. When the board-to-board female connector 30 is combined with the circuit board 400, the spacing H formed by adjacent soldering feet is connected to the indentation space G. Since the indentation space G is connected to the inner groove 341, the inner groove 341 is connected to the terminal hole 341, so that the spacing H is indirectly connected to the terminal groove 321. Through the design of the inner groove, indentation space and spacing, the interference (contact) surface between the terminal piece 40 and the insulating seat 30 is effectively reduced to obtain magnetic reduction, thereby improving impedance and enhancing product performance.

[0057] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0058] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A board-to-board male connector adapted to a PCB, comprising an insulator and an electrical contact secured to the insulator, characterized in that: The insulator has a rectangular body and a throat portion that raises the rectangular body at both ends of the rectangular body, a buckle groove is formed on the rectangular body, a tongue plate is raised in the center of the bottom of the buckle groove, and contact grooves are arranged on two opposite sides of the tongue plate; the buckle grooves on the back of the rectangular body are formed with ventilation grooves corresponding to the tongue plates, and the contact grooves are directly connected to the ventilation grooves; serrated portions are formed on the bottom of the rectangular body near the two opposite outer sides, and a convex block protruding from the bottom of the rectangular body is formed between adjacent serrated portions, and a gap is formed between the convex block and the serrated portion; the throat extends to the bottom of the rectangular body to form a step surface, and the serrated portion is larger than the convex portion. The height is lower than the step height, so that when the insulator adapts to the PCB board, there is a gap between the serrated portion and the PCB board to connect the ventilation groove; the electrical contact includes a contact pair, and the contact pair is composed of two contacts with a mirror structure, wherein: each contact includes a fixed section, a contact section and a welding section, the fixed section is connected between the connecting foot and the connecting contact section, the contact section is divided into a flat contact section and an oblique contact section, the welding section is divided into a bent section and a welding foot, and the welding foot has a veneer; the width of the bent section is equal to the width of the connecting contact section but smaller than the width of the connecting foot, and the protrusion contacts the veneer of the welding foot.

2. The connector according to claim 1, wherein: The two opposite side walls of the buckle groove extend upward to form a clamping wall whose height is greater than the two opposite end walls of the buckle groove. The tongue plate is equal to or greater than the end wall height in the buckle groove but less than the clamping wall height, wherein: the outer side surface of the clamping wall is horizontal with the outer side surface of the rectangular body, and the inner side surface of the clamping wall is horizontal with the inner wall surface of the buckle groove.

3. The connector according to claim 2, wherein: The insulator is divided into an upper buckle groove part, a middle solid part and a lower air groove part. A contact hole that passes directly through the contact groove is provided in the solid part, and the contact hole passes through the ventilation groove; a blanking hole is formed on the bottom of the buckle groove on the lower side of the rectangular body, and the blanking holes are arranged between the ventilation groove and the serrated part, and the depth of the blanking hole is limited to the height of the air groove part.

4. The connector according to claim 3, wherein: An interference portion is formed between the connecting contact portion and the flat contact portion, burrs are formed on both sides of the interference portion, convex portions are extended on both sides of the oblique contact portion, the burrs interfere with both sides of the contact hole in the contact hole, and the convex portions interfere with both sides of the contact groove, so that the contact is firmly fixed in the insulator.

5. A board-to-board female connector, mounted on a circuit board, comprising an insulating seat and a terminal member adapted to fit within the insulating seat, characterized in that: The insulating seat is die-formed and includes a main body and mirror-image pads formed at both ends of the main body. The main body is provided with a tongue plate groove, and the opposite walls of the tongue plate groove are respectively provided with terminal grooves for installing terminal pieces; the bottom of the main body of the opposite terminal grooves is indented to form a recessed portion, and the recessed portions are respectively provided with terminal holes corresponding to and directly through each terminal groove, and the terminal hole has an inner groove connecting the recessed portion to the terminal groove; the pad is extended outward near the bottom of the main body and extends as a whole beyond the bottom of the pad under the main body, and the lower surface of the main body forms an indented space relative to the lower surface of the pad, and the indented space is connected to the terminal groove through the inner groove.

6. The connector according to claim 5, wherein: The terminal piece is stamped and includes a terminal pair, which is composed of two terminals with mirror-image structures, wherein: each terminal includes a holding portion, an elastic section, an elastic contact portion and a welding foot, the welding foot is connected to the lower end of the holding portion and forms an angle of 90° to 95° with the holding portion; the elastic section includes a first elastic section and a second elastic section, the first elastic section is connected to the upper end of the holding portion and extends obliquely, and the second elastic section is connected to the elastic contact portion.

7. The connector according to claim 6, wherein: The retaining portion interferes with the terminal hole in the terminal hole so that the terminal is firmly fixed in the insulating seat. The elastic section is inclined toward the notch in the terminal slot and makes the elastic contact portion protrude in the tongue plate slot.

8. The connector according to claim 7, wherein: The circuit board has a soldering pad that adapts to the terminal welding feet. When the terminal adapts to the insulating seat, the welding feet extend to the corresponding outer side of the insulating seat through the recessed portion. When the board-to-board female end connector adapts to the circuit board, adjacent welding feet form a spacing, and the spacing is connected to the terminal groove through the indented space and the inner groove.

9. A board-to-board male connector and a matching board-to-board female connector, characterized in that: The male end connector is adapted to the PCB board and includes an insulator and an electrical contact fixed to the insulator. The insulator has a rectangular body and a helical portion that raises the rectangular body at both ends of the rectangular body. A buckle groove is formed on the rectangular body, and a tongue plate is raised in the center of the bottom of the buckle groove. Contact grooves for the contacts to adapt are arranged on two opposite surfaces of the tongue plate; ventilation grooves corresponding to the tongue plates are formed in the buckle grooves opposite to each other in the rectangular body, and the contact grooves are directly connected to the ventilation grooves through the contact holes, and the contact holes are formed with gaps connecting the buckle grooves and the ventilation grooves; serrated portions are formed under the rectangular body near two opposite outer sides, and protrusions protruding from the bottom of the rectangular body are formed between adjacent serrated portions, and a gap is formed between the protrusions and the serrated portions; the throat extends toward the bottom of the rectangular body to form a step surface, and the serrated portion is greater than the height of the protrusion but lower than the height of the step surface, so that when the insulator adapts to the PCB board, the serrated portion and the PCB board have a gap connecting the ventilation grooves; board to board The female connector is installed on the circuit board and includes an insulating seat adapted to fit the terminal piece in the insulating seat. The insulating seat is die-formed and includes a main body and a mirror-image pad formed at both ends of the main body. The main body is provided with a tongue plate groove for inserting the tongue plate, and the opposite walls of the tongue plate groove are respectively provided with terminal grooves for installing the terminal piece; the bottom of the main body of the opposite terminal grooves is indented to form a recessed portion, and the recessed portions are respectively provided with terminal holes corresponding to and directly through each terminal groove, and the terminal hole has an inner groove connecting the recessed portion to the terminal groove; the pad expands outward near the bottom of the main body and extends as a whole beyond the bottom of the pad under the main body, and a retracted space is formed on the lower surface of the main body relative to the lower surface of the pad, and the retracted space is connected to the terminal groove through the inner groove. When the board-to-board male connector is adapted to the board-to-board female connector, the contact and the terminal form an electrical path, and the retracted space is connected to the gap through the terminal groove, so that the gap is connected to the gap through the ventilation groove.

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