Signal terminal and electric connector

Abstract

The utility model discloses a signal terminal and an electric connector, the electric connector comprises an insulation body for accommodating a plurality of signal terminals, the insulation body is concavely provided with a slot for receiving an electronic card, each signal terminal comprises a main body part, an elastic arm extending from one end of the main body part and a guide connection part extending from the other end of the main body part, the elastic arm is provided with an abutting part which abuts against the golden finger of the electronic card, the elastic arm is provided with a guide section at one side of the abutting part, the elastic arm is provided with an electrical coupling section at the other side of the abutting part, and the electrical coupling section is electrically coupled with the golden finger to realize electrical connection, so that the stub length of the signal terminal and the stub length of the golden finger are effectively reduced; the premature generation of resonance is inhibited, the insertion loss is optimized, and the SI performance of the electric connector is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of signal terminal and electric connector, especially a kind of signal terminal and electric connector electrically coupled with electronic card gold finger. BACKGROUND

[0002] A kind of signal terminal and electric connector with signal terminal of existing, electric connector includes the insulating body with slot, the insulating body contains multiple signal terminals, signal terminal is equipped with elastic arm structure, such as Figure 11 As shown in the elastic arm, arc-shaped contact portion 21 is arranged on the elastic arm, guiding portion 25 and pre-pressing portion 26 are sequentially bent and extended from the upper end of contact portion 21 to fix the head of signal terminal, a transition section 2221 is bent and extended from the lower end of contact portion 21, force arm one 221 and force arm two 222 are sequentially extended from the transition section 2221 to be connected to the fixed portion 23 of signal terminal, when electronic card is inserted into slot, force arm one 221 is kept parallel to electronic card to keep the distance between force arm one 221 and gold finger small to realize electrical coupling.

[0003] With the increasing requirement of signal transmission signal integrity performance (hereinafter referred to as SI performance) of electric connector, the signal terminal in the prior art only relies on the small distance between force arm one 221 and electronic card gold finger to reduce the stub of gold finger, and guiding portion 25 and pre-pressing portion 26 are arranged from contact portion 21 to the terminal end of the terminal, so that the stub length of signal terminal is relatively long, so only the stub length of gold finger is reduced, and the stub length of signal terminal is not reduced, resonance is easily generated at high-speed transmission frequency, which leads to the premature drop of insertion loss (IL) curve, and the generation of resonance also leads to the increase of crosstalk interference between multiple signal terminals, which is not conducive to the transmission of complete signal of signal terminal at higher transmission frequency. Furthermore, arc-shaped contact portion 21 is bent and extended in the direction away from electronic card for a distance, and then force arm one 221 parallel to electronic card is extended, the distance between force arm one 221 and electronic card is affected by the bending process of arc-shaped contact portion 21 and the length and bending angle of transition section 2221, so it is easy to become too large, which leads to the difficulty of electrical coupling between force arm one 221 and gold finger, and the control of force arm one 221 parallel to electronic card also has very high precision requirement for terminal manufacturing, so that the manufacturing cost is high.

[0004] Therefore, it is necessary to design an improved signal terminal and electric connector to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] In view of the problems in the background art, the purpose of the utility model is to provide a kind of signal terminal and electric connector, which simultaneously reduces the stub length of signal terminal and gold finger, and is easy to manufacture.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] A signal terminal is used to contact with the gold finger of the surface of the electronic card to transmit high-speed signals, characterized in that it comprises: a main body part, a elastic arm is extended from one end of the main body part and a guide connection part is extended from the other end of the main body part, the elastic arm has a abutting part which is mechanically contacted and electrically connected to the gold finger, the elastic arm is inclined to extend a guide section to the end of the abutting part on one side of the abutting part, the distance between the abutting part and the end of the elastic arm is less than or equal to 1.0mm, the elastic arm is provided with an inclined electrically coupled section on the other side of the abutting part, the electrically coupled section has a coupling plane facing the surface of the gold finger, the maximum distance between the coupling plane and the gold finger is less than or equal to 0.19mm to allow the electrically coupled section and the gold finger to be electrically coupled to realize electrical connection, the distance between the end of the electrically coupled section away from the guide section and the end of the gold finger away from the guide section along the extension direction of the elastic arm is less than or equal to 0.7mm.

[0008] Further, the abutting part is in line contact with the gold finger, the guide section defines a guide curved surface on one side of the abutting part, the coupling plane is located on the other side of the abutting part and is inclined to the gold finger, and the included angle between the coupling plane and the gold finger is smaller than the included angle between the guide curved surface and the gold finger.

[0009] Further, the included angle between the coupling plane and the gold finger is 0.5°-9°.

[0010] Further, the guide curved surface is gradually curved along the outer surface of the guide section, the abutting part is located at the intersection of the guide curved surface and the coupling plane, and the left and right sides of the guide section and the electrically coupled section are provided with circular arc chamfers.

[0011] Further, an extension section is bent and inclined from one end of the electrically coupled section and connected to the main body part, the extension length of the electrically coupled section is 0.5mm-1.5mm, the end of the electrically coupled section away from the guide section is higher than the end of the gold finger away from the guide section, the extension section extends beyond the gold finger, and the included angle between the extension section and the gold finger is greater than the included angle between the coupling plane and the gold finger.

[0012] The utility model discloses still adopt following technical scheme: a kind of electric connector, to be electrically connected with the gold finger of an electronic card, it is characterized in that, comprising: an insulating body, insulating body is recessed from top to bottom one slot for receiving electronic card;At least one pair of signal terminals is housed in the differential signal pair of insulating body, signal terminal is provided with a main part, from the main part, a spring arm is extended into the slot by being obliquely bent upwards, a guide part is formed by being extended downwards from the main part out of the slot, the spring arm includes guide section, abutting portion, electrical coupling section and extension section sequentially and continuously extended from its end in up-down direction, the distance between abutting portion and the end of guide section is less than or equal to 1.0mm, electrical coupling section is obliquely extended and has a coupling plane facing the surface of gold finger, the maximum distance between coupling plane and gold finger is less than or equal to 0.19mm, the lower end of electrical coupling section is higher than the lower end of gold finger, the distance between the lower end of electrical coupling section and the lower end of gold finger in up-down direction is less than or equal to 0.7mm, the included angle between extension section and gold finger is greater than the included angle between coupling plane and gold finger.

[0013] Further, the included angle between the coupling plane and the gold finger is greater than 3° and less than or equal to 9°.

[0014] Further, the extension length of the electrical coupling section is 0.5mm-1.5mm.

[0015] Further, the width of the electrical coupling section gradually increases from top to bottom, and the lateral distance between the two electrical coupling sections of the two signal terminals constituting the differential signal pair gradually decreases from top to bottom.

[0016] Further, the insulating body is provided with a plurality of signal terminal receiving grooves, the two signal terminals constituting the differential signal pair are received in two adjacent signal terminal receiving grooves, the two adjacent signal terminal receiving grooves are connected in communication in left-right direction, the two extension sections are located in the two signal terminal receiving grooves connected in communication and exposed on one side of the slot, a shielding sheet is fixed to the insulating body and includes a flat plate part shielding one side of the two main parts, a shielding part is obliquely extended upwards from the flat plate part corresponding to the differential signal pair into the two signal terminal receiving grooves connected in communication, the shielding part is shielded on the side of the two extension sections exposed on the slot and is arranged in spaced relation with the two extension sections, and the width of the shielding part in left-right direction is greater than the distance between the two outer sides of the two extension sections of the two signal terminals.

[0017] Further, the plurality of signal terminals and the plurality of ground terminals are assembled by two insulating bases fixed to the insulating body, the insulating body is provided with a plurality of signal terminal receiving grooves and a plurality of ground terminal receiving grooves corresponding to the elastic arms of the signal terminals and the elastic arms of the ground terminals on both sides of the insertion slot, an installation groove is concave upward from the bottom of the insulating body, a plug is received in the installation groove and located between the two insulating bases, the plug at least includes conductive plastic, a plurality of clamping grooves are concave on one side of each insulating base close to the insertion slot corresponding to the plurality of ground terminals, the two sides of the conductive plastic are respectively provided with a plurality of clamping parts, the plurality of clamping parts are respectively received in the plurality of clamping grooves and abut the plurality of ground terminals one by one.

[0018] Further, the shielding sheet is inserted and fixed between the plug and the insulating base, the installation groove is communicated upward with the plurality of ground terminal receiving grooves and the signal terminal receiving grooves, the plug further includes insulating plastic, the insulating plastic protrudes an insulating isolation part into the two signal terminal receiving grooves communicated with each other corresponding to the differential signal pair, the conductive plastic protrudes a conductive extension part into the ground terminal receiving groove corresponding to the ground terminal, the width of the insulating isolation part is greater than the width of the conductive extension part, and the height of the shielding part in the up-down direction is higher than the height of the conductive extension part.

[0019] Compared with the prior art, the utility model has the advantages that: the signal terminal includes the abutting part directly mechanically contacting the electronic card gold finger and the guide section located above the abutting part, the distance between the abutting part and the end of the elastic arm is reduced and controlled in the range of less than or equal to 1.0mm by canceling the pre-pressing part in the prior art, the stub length of the signal terminal is reduced, and the electrical coupling section is provided below the abutting part and continuously and obliquely extends from below the abutting part, which can effectively control the maximum distance between the electrical coupling section and the electronic card, not only makes the signal terminal forming process simple, but also makes the distance between the electrical coupling section and the gold finger gradually change from the abutting part along with the extension of the electrical coupling section, which is beneficial to the continuous electrical coupling of the signal terminal from the abutting part to the gold finger along a distance, and the maximum distance between the electrical coupling section and the surface of the gold finger is less than or equal to 0.19mm, so as to ensure that the electrical coupling section and the gold finger can be electrically connected through the small gap capacitance coupling, and the electrical coupling section defines a flat coupling plane, which is beneficial to increasing the opposite area of the electrical coupling section and the gold finger to better capacitance coupling, and the distance between the lower end of the electrical coupling section and the lower end of the gold finger in the up-down direction defines the stub length of the gold finger and is less than or equal to 0.7mm, so as to further reduce the stub length of the gold finger, thus the stub length of the signal terminal and the stub length of the gold finger are simultaneously reduced, which is beneficial to inhibiting the resonance from being generated too early, thereby optimizing the insertion loss at high speed and high frequency and improving the SI performance of the electrical connector. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1The utility model discloses a three-dimensional schematic view of electric connector, electronic card and circuit board.

[0021] Figure 2 The utility model discloses a three-dimensional exploded view of electric connector.

[0022] Figure 3 The utility model discloses a sectional view of the plane formed by the electric connector along the left-right direction and the up-down direction.

[0023] Figure 4 The utility model discloses a sectional view of the plane formed by the electric connector along the front-back direction and the up-down direction after inserting the electronic card.

[0024] Figure 5 The utility model discloses a three-dimensional schematic view of signal terminal.

[0025] Figure 6 The utility model discloses a side view when the signal terminal is butted with the electronic card.

[0026] Figure 7 The utility model discloses a Figure 6 The utility model discloses an enlarged schematic view of area B in the circle.

[0027] Figure 8 The utility model discloses a curve graph of the frequency and the insertion loss of the different distances of the abutting portion and the terminal end of signal terminal.

[0028] Figure 9 The utility model discloses a curve graph of the frequency and the insertion loss of the different distances of the lower end of the electrical coupling section and the lower end of the gold finger of signal terminal.

[0029] Figure 10 The utility model discloses a curve graph of the frequency and the insertion loss of the different angles of the electrical coupling section and the gold finger of signal terminal.

[0030] Figure 11 The utility model discloses a side view of signal terminal in prior art.

[0031] The specific embodiment figure number explanation:

[0032]

[0033]

Specific embodiment

[0034] In order to better understand the purpose, structure, characteristics and effects of the utility model, the utility model will be further explained in combination with the drawings and specific embodiments.

[0035] For example, Figures 1 to 7As shown, the signal terminal 3 and the electric connector 100 of the utility model, the electric connector 100 includes an insulating body 1, the insulating body 1 is recessed from top to bottom a slot 11 for receiving electronic card 200, the both sides of slot 11 are provided with a plurality of signal terminals 3 and a plurality of ground terminals 4, signal terminal 3 and ground terminal 4 all have elastic arm 32, 42, and are provided with the abutting portion 321, 421 of gold finger 7 abutment of electronic card 200 on elastic arm 32, 42, wherein the elastic arm 32 of signal terminal 3 is provided with electrical coupling section 323 below the abutting portion 321, and there is a small gap between electrical coupling section 323 and gold finger 7 to make electrical coupling between electrical coupling section 323 and gold finger 7, a plug piece 5 is clamped between two insulating seats 2, plug piece 5 is provided with conductive plastic 51 and is electrically connected with the plurality of ground terminals 4 on both sides of slot 11, two shielding sheets 6 are respectively clamped between plug piece 5 and two insulating seats 2 to reduce the crosstalk interference between the plurality of signal terminals 3 on both sides of slot 11. In the embodiment, the direction along the Z axis is the up-down direction, the direction along the X axis is the front-back direction, and the direction along the Y axis is the left-right direction.

[0036] As Figures 2 to 4As shown, a slot 11 is recessed downward from the top surface of the insulating body 1, and a mounting groove 14 is recessed upward from the bottom surface of the insulating body 1, the mounting groove 14 is located below the slot 11, the front and rear inner wall surfaces of the slot 11 are each recessed inward to form a plurality of signal terminal receiving grooves 12 and a plurality of ground terminal receiving grooves 13 to receive the elastic arms 32 of the signal terminals 3 and the elastic arms 42 of the ground terminals 4 respectively, and a partition 15 continuously extends in the up-down direction between the signal terminal receiving groove 12 and the ground terminal receiving groove 13 which are adjacent to each other on the front inner wall surface or the rear inner wall surface of the slot 11 to separate the elastic arms 32 of the signal terminals 3 and the elastic arms 42 of the ground terminals 4, while the two signal terminal receiving grooves 12 which are adjacent to each other are not provided with the continuous partition 15, so that the two signal terminal receiving grooves 12 which are adjacent to each other are partially connected in the left-right direction, and instead of the partition 15, a separation rib 16 is arranged between the two signal terminal receiving grooves 12 which are connected to separate the two elastic arms 32 of the signal terminals 3, wherein the outer surface of the partition 15 is flush with the front and rear inner wall surfaces of the slot 11, and the outer surface of the separation rib 16 is spaced apart from the front and rear inner wall surfaces of the slot 11 by a distance, and the width of the separation rib 16 in the left-right direction is also smaller than the width of the partition 15, so that the separation rib 16 has a smaller size as a whole, which not only ensures that the two elastic arms 32 of the signal terminals 3 do not contact each other to cause short circuit, but also helps to keep the distance between the two elastic arms 32 small to achieve tight coupling, and also increases the plastic content around the two elastic arms 32 of the signal terminals 3, improves the dielectric constant to increase the capacitance, reduces the impedance, and makes the impedance of the signal terminals 3 at the elastic arms 32 tend to match. The insulating body 1 is provided with a blocking portion 17 at the top of each signal terminal receiving groove 12 and each ground terminal receiving groove 13 to block the end of the elastic arm 32 of the signal terminal 3 and the end of the elastic arm 42 of the ground terminal 4 from protruding into the slot 11, and the signal terminal receiving groove 12 and the ground terminal receiving groove 13 are connected to the mounting groove 14 through the bottom of the insulating body 1.

[0037] As Figures 2 to 4As shown, the signal terminals 3 and the ground terminals 4 each include a main body portion 31, 41, an elastic arm 32, 42 extending upwardly from one end of the main body portion 31, 41, an abutting portion 321, 421 provided on the elastic arm 32, 42 for abutting to the transmission signal gold fingers 7 or the ground gold fingers 7 on the surface of the electronic card 200, and a lead portion 33, 43 extending downwardly from the other end of the main body portion 31, 41 for soldering to the circuit board 300. The main body portions 31 of the plurality of signal terminals 3 and the main body portions 41 of the plurality of ground terminals 4 are collectively molded and fixed in the insulating seat 2, the lead portions 33, 43 of the signal terminals 3 and the ground terminals 4 extend out of the insulating seat 2 from the lower side of the main body portions 31, 41, the elastic arms 32, 42 of the signal terminals 3 and the ground terminals 4 each extend from the upper side of the main body portions 31, 41 and correspondingly extend into the signal terminal receiving grooves 12 and the ground terminal receiving grooves 13, and the abutting portions 321, 421 of the signal terminals 3 and the ground terminals 4 protrude into the insertion slot 11, wherein each two adjacent signal terminals 3 on the left and right form a differential signal pair for transmitting high-speed differential signals, and a ground terminal 4 is provided between the two adjacent differential signal pairs.

[0038] As Figures 4 to 7As shown, the elastic arm 32 of the signal terminal 3 comprises a guide segment 322 extending downward from the top end thereof, a electrical coupling segment 323 bent from the lower end of the guide segment 322 and extending downward obliquely, and an abutting portion 321 located at the bent connection between the guide segment 322 and the electrical coupling segment 323. The guide segment 322 is partially blocked by the blocking portion 17 in the front-rear direction to fix the end of the elastic arm 32 of the signal terminal 3, and the distance D1 between the abutting portion 321 and the end of the guide segment 322 is less than or equal to 1 mm. Compared with the prior art signal terminal 3 in which the guide portion and the pre-pressing portion are separately arranged above the abutting portion 321, the present utility model only has the guide segment 322 above the abutting portion 321 of the signal terminal 3, so that the stub length of the signal terminal 3 is shortened. The guide segment 322 defines a guide arc surface 3221 located above the abutting portion 321, which continuously extends along the guide segment 322 and gradually bends downward, and the guide arc surface 3221 protrudes in the slot 11 to guide the electronic card 200 to be smoothly inserted downward.The electrical coupling section 323 defines a coupling plane 3231 located below the abutment portion, the coupling plane 3231 is an inclined plane continuously extending along the electrical coupling section 323, the flat surface is conducive to the electrical coupling section 323 and the gold finger 7 having a large opposite area for good capacitive coupling, the abutment portion 321 corresponds to the intersection of the guide camber surface 3221 and the coupling plane 3231 and corresponds to the line contact and electrical connection with the gold finger 7 transmitting signals on the electronic card 200, the coupling plane 3231 continuously extends downward from the abutment portion 321, and the included angle a (0.5°-9°) between the coupling plane 3231 and the gold finger 7 is significantly smaller than the included angle between the guide camber surface 3221 and the gold finger 7, in the embodiment, the included angle a between the coupling plane 3231 and the gold finger 7 is 5°, so that the distance between the coupling plane 3231 and the gold finger 7 changes gently below the abutment portion 321, instead of the existing technology which extends a distance from the arc-shaped contact portion and then extends a parallel arm, which is conducive to the signal terminal 3 directly and continuously further electrically coupled with the corresponding gold finger 7 below the abutment portion 321, and only needs to keep the included angle a between the coupling plane 3231 and the gold finger 7 within a small inclination angle (0.5°-9°) range, without the need for precise control of the electrical coupling section 323 to keep absolute parallel with the electronic card 200, reducing the manufacturing tolerance of the signal terminal 3, facilitating the manufacturing of the signal terminal 3, thereby saving the manufacturing cost, preferably the included angle between the coupling plane 3231 and the gold finger 7 is greater than 3° and less than or equal to 9°, the maximum distance D2 between the coupling plane 3231 and the gold finger 7 is less than or equal to 0.19mm, so that a small gap is kept between the electrical coupling section 323 and the gold finger 7, and capacitive coupling and electrical connection can be achieved at high frequency and high speed, preferably the maximum distance D2 between the coupling plane 3231 and the gold finger 7 is less than or equal to 0.10mm, the stub length of the gold finger 7 is determined by the distance D3 between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 in the up-down direction, the distance D3 between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 in the up-down direction is less than or equal to 0.7mm, in the embodiment, the distance D3 between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 in the up-down direction is 0.43mm, thereby shortening the stub length of the gold finger 7, so as to effectively shorten the stub length of the signal terminal 3 and the stub length of the gold finger 7 at the same time, and suppress the premature resonance at high speed and high frequency, so as to optimize the insertion loss (IL) and ensure the SI performance of the electrical connector 100.In the embodiment, the elastic arm 32 of the signal terminal 3 extends in the up-down direction, so the stub length of the corresponding gold finger 7 is the distance D3 between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7, and in other embodiments, the elastic arm 32 of the signal terminal 3 can extend in the front-back direction or the left-right direction, so the stub length of the corresponding gold finger 7 is the distance between the end of the electrical coupling section 323 away from the guide section 322 and the end of the gold finger 7 away from the guide section 322 along the extension direction of the elastic arm 32 of the signal terminal 3.

[0039] As shown in Figure 3 and Figure 5 , the width of the electrical coupling section 323 gradually increases from top to bottom and is greater than the width of the guide section 322, which increases the facing area of the coupling plane 3231 and the gold finger 7 to achieve good electrical coupling with the gold finger 7, and the distance between the two electrical coupling sections 323 of the two signal terminals 3 in the differential signal pair gradually decreases from top to bottom and is less than the distance between the two guide sections, so that the two electrical coupling sections 323 are tightly coupled to reduce the crosstalk interference of the signal terminal 3. The length of the electrical coupling section 323 extending in the up-down direction is 0.5mm-1.5mm, so that the electrical coupling section 323 has a longer length to continuously achieve good electrical coupling with the gold finger 7, and preferably the length of the electrical coupling section 323 is greater than or equal to 0.5mm and less than or equal to 0.8mm, and in the embodiment, the length of the electrical coupling section 323 is 0.8mm, and in addition, round arc chamfers are provided on both sides of the guide section 322 and the electrical coupling section 323 to prevent the burr structure of the signal terminal 3 from scratching the gold finger 7.

[0040] The simulation results of Figure 8 are used to illustrate the influence of the distance between the abutting portion 321 of the signal terminal 3 and the end of the guide section 322 on the insertion loss (IL), Figure 8The three curves Q1, Q2, and Q3 in the figure are graphs showing the relationship between frequency (horizontal axis) and insertion loss (vertical axis) when the distances between the contact portion 321 of signal terminal 3 and the end of the guide section 322 are 1.3mm, 1.0mm, and 0.9mm, respectively. From the data in the graph, it can be seen that point m1 of curve Q1 (distance 1.3mm) is the dropout point, where a dropout occurs at a resonant frequency of approximately 40GHz. Point m2 of curve Q2 (distance 1.0mm) is also the dropout point, where a dropout occurs at a resonant frequency of approximately 47GHz. Curve Q3 (distance 0.9mm)... The drop point is m3 (9mm), and the resonant frequency drops at about 49GHz. It can be seen that the resonant frequency moves backward as the distance between the abutment 321 and the end of the guide section 322 decreases. In fact, the reduction of the distance D1 between the abutment 321 and the end of the guide section 322 reduces the length of the residual post of the signal terminal 3, and the resonant frequency moves backward. Since the guide section 322 is needed to guide the insertion of the electronic card 200, the insertion loss is optimized and the SI performance of the electrical connector 100 is guaranteed while ensuring that the signal terminal 3 has a guiding function.

[0041] use Figure 9 The simulation results are used to illustrate the effect of the distance between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 on the insertion loss (IL). Figure 9 The three curves Q4, Q5, and Q6 in the figure represent the relationship between frequency (horizontal axis) and insertion loss (vertical axis) when the distances between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 are 0.9mm, 0.7mm, and 0.5mm, respectively. From the data in the figures, it can be seen that point m1 of curve Q4 (distance 0.9mm) is the dropout point, where a drop occurs at a resonant frequency of approximately 43GHz. Point m2 of curve Q5 (distance 0.7mm) is also the dropout point, where a drop occurs at a resonant frequency of approximately 47GHz. Point m3 of curve Q6 (distance 0.5mm) is also the dropout point, where a drop occurs at a resonant frequency of approximately 49GHz. Therefore, the resonant frequency... The frequency shifts backward as the distance between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 decreases. In fact, the decrease in the distance between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 reduces the residual length of the gold finger 7, thus shifting the resonant frequency backward. Since there is a risk of the signal terminal 3 pin being knocked down when the lower end of the electrical coupling section 323 is aligned with the lower end of the gold finger 7, the distance D3 between the lower end of the electrical coupling section 323 and the lower end of the gold finger 7 is greater than 0 and less than or equal to 0.7mm. While ensuring good contact between its contact part 321 and the gold finger 7, the insertion loss is optimized, and the SI performance of the electrical connector 100 is guaranteed.

[0042] use Figure 10 The simulation results are used to illustrate the effect of the angle α between the coupling plane 3231 and the gold finger 7 on the insertion loss (IL).Figure 10 Three curves Q7, Q8, Q9 in the figure are the curves of the frequency (horizontal axis) and the insertion loss (vertical axis) when the included angle between the coupling plane 3231 and the gold finger 7 is 10°, 5°, 3° respectively. From the data in the figure, it can be seen that the m1 point of the curve Q7 (the included angle is 10°) is the drop point, and the resonance frequency is about 47 GHz when the drop occurs. The m2 point of the curve Q8 (the included angle is 5°) is the drop point, and the resonance frequency is about 49 GHz when the drop occurs. The m3 point of the curve Q9 (the included angle is 3°) is the drop point, and the resonance frequency is about 50 GHz when the drop occurs. It can be seen that the resonance frequency moves backward with the decrease of the included angle between the coupling plane 3231 and the gold finger 7. In fact, the decrease of the included angle between the coupling plane 3231 and the gold finger 7 makes the electrical coupling section 323 and the gold finger 7 well capacitively coupled, so that the stub length of the gold finger 7 is reduced, and the resonance frequency moves backward, thereby optimizing the insertion loss and ensuring the SI performance of the electrical connector 100. It can be known from the above conclusion that the insertion loss performance when the included angle between the coupling plane 3231 and the gold finger 7 is 9° is better than that when the included angle is 10°, that is, the drop point of the corresponding curve when the included angle between the coupling plane 3231 and the gold finger 7 is 9° is located between the m1 point of the curve Q7 (the included angle is 10°) and the m2 point of the curve Q8 (the included angle is 5°).

[0043] As shown in Figure 6 The lower end of the electrical coupling section 323 is higher than the lower end of the gold finger 7, avoiding the signal terminal 3 from kneeling when the electronic card 200 is inserted, preventing the abutting portion 321 of the signal terminal 3 from being in poor contact with the electronic card 200. An extension section 324 connected to the main body portion 31 extends downward from the lower end of the electrical coupling section 323. The extension section 324 extends downward beyond the lower end of the gold finger 7. The included angle between the extension section 324 and the gold finger 7 is greater than the included angle between the coupling plane 3231 and the gold finger 7. The length of the extension section 324 is greater than the length of the electrical coupling section 323. The extension section 324 has a long lever structure and is arranged away from the side of the electronic card 200 compared with the electrical coupling section 323, preventing the overall extension angle of the elastic arm 32 from being too flat and causing insufficient normal force of the abutting portion 321. When the abutting portion 321 of the signal terminal 3 contacts the gold finger 7 and causes the elastic arm 32 to deform, the long lever structure of the extension section 324 has good elasticity, thereby providing a counterforce to enhance the normal contact force between the abutting portion 321 and the gold finger 7, ensuring good mechanical contact and electrical connection between the abutting portion 321 of the signal terminal 3 and the gold finger 7. The electrical coupling section 323 and the extension section 324 are both accommodated in the signal terminal accommodation groove 12. The two electrical coupling sections 323 and the two extension sections 324 of the two signal terminals 3 constituting a differential signal pair are separated by the spacer rib 16. The two extension sections 324 do not protrude into the insertion slot 11 but are exposed to one side of the insertion slot 11.

[0044] As shown in Figures 2 to 4 , the plug 5 comprises an electrically conductive plastic 51 part and an insulating plastic 52 part assembled together, wherein the electrically conductive plastic 51 has an electrically conductive base 511 and a plurality of electrically conductive extensions 512 protruding upward from the electrically conductive base 511 corresponding to the plurality of ground terminal receiving grooves 13, the base is provided with a plurality of through grooves 5111, the insulating plastic 52 has an insulating base 521 and a plurality of insulating partitions 522 protruding upward from the insulating base 521 corresponding to the plurality of signal terminal receiving grooves 12, the electrically conductive base 511 and the insulating base 521 overlap each other, the plurality of insulating partitions 522 correspond to pass through the plurality of through grooves 5111 to assemble the electrically conductive plastic 51 part and the insulating plastic 52 part together, the electrically conductive base 511 and the insulating base 521 are collectively received in the mounting groove 14, the electrically conductive extensions 512 protrude upward into the ground terminal receiving grooves 13 and correspond to one side of the elastic arms 42 of the ground terminals 4, the width of the insulating partitions 522 is greater than the width of the electrically conductive extensions 512, the insulating partitions 522 protrude upward into the two connected signal terminal receiving grooves 12 and correspond to one side of the two extension sections 324 of the two signal terminals 3, two electrically conductive extensions 512 are arranged on one side of the two ground terminals 4 on the left and right sides of each differential signal pair, and since the electrically conductive plastic 51 is composed of a lossy material, the two electrically conductive extensions 512 can further isolate the noise signals between different differential signal pairs to reduce crosstalk interference.

[0045] As shown in Figure 4 , the plug 5 is located between the two insulating bases 2, and a plurality of clamping grooves 21 are arranged inward corresponding to the plurality of ground terminals 4 on one side of each insulating base 2 close to the insertion slot 11, so that the side surface of the main body part 41 of the plurality of ground terminals 4 is exposed in the plurality of clamping grooves 21, and the front wall and the rear wall of the electrically conductive plastic 51 are respectively provided with a plurality of clamping parts 513 outward protruding corresponding to the plurality of clamping grooves 21, the plurality of clamping parts 513 are correspondingly received in the plurality of clamping grooves 21 and abut on the plurality of main body parts 41 of the plurality of ground terminals 4, so that the plurality of ground terminals 4 on both sides of the insertion slot 11 are simultaneously electrically connected by the electrically conductive plastic 51, thereby increasing the ground return path to quickly guide the noise signals out through the ground path and suppress the generation of resonance.

[0046] As shown in Figure 3 and Figure 4As shown, since the conductive plastic 51 is made of a lossy material, in order to avoid that the conductive plastic 51 absorbs the noise signal while also absorbing too much signal transmitted by the signal terminal 3 to the receiving end (for example, a system), the two shielding sheets 6 are respectively correspondingly clamped between the two insulating seats 2 and the plug 5, and the shielding sheet 6 made of metal is used to isolate the conductive plastic 51 and the signal terminal 3, so as to prevent the conductive plastic 51 from absorbing too much signal transmitted by the signal terminal 3, thereby optimizing the insertion loss. Specifically, each shielding sheet 6 comprises a flat plate part 61, the flat plate part 61 is correspondingly shielded on the side of the main body part 31 of the signal terminal 3 close to the insertion slot 11, and at the same time, the flat plate part 61 is also used to separate the plurality of main body parts 31 of the plurality of signal terminals 3 on both sides of the insertion slot 11, so as to reduce the crosstalk interference between the plurality of signal terminals 3 on both sides of the insertion slot 11, and a shielding part 62 is correspondingly upwardly inclined and extended from the upper end of the flat plate part 61, the shielding part 62 enters the adjacent two signal terminal receiving grooves 12 constituting a differential signal pair, so that the shielding part 62 is shielded on one side of the two extension sections 324 of the differential signal pair and is arranged to be spaced apart from the two extension sections 324, thereby increasing the shielding area of the shielding sheet 6 to the signal terminal 3, further reducing the crosstalk interference of the plurality of signal terminals 3 at the extension section 324, the height of the shielding part 62 is higher than the height of the conductive extension part 512, and the width of the shielding part 62 along the left-right direction is greater than the distance between the two outer sides of the two extension sections 324 of the differential signal pair, thereby further increasing the shielding area of the shielding sheet 6 to the signal terminal 3 and increasing the blocking area between the signal terminal 3 and the conductive extension part 512, thereby strengthening the shielding effect of the shielding sheet 6 to the signal terminal 3, further optimizing the insertion loss, and improving the SI performance of the electrical connector 100.

[0047] In summary, the electrical connector 100 has the following beneficial effects:

[0048] (1) The signal terminal 3 includes an abutting portion 321 directly mechanically contacting the gold finger 7 of the electronic card 200 and a guide segment 322 located above the abutting portion 321. Since the pre-pressing portion structure in the prior art is cancelled, the distance D1 between the abutting portion 321 and the end of the guide segment 322 is reduced and controlled within a range less than or equal to 1.0 mm, so that the stub length of the signal terminal 3 is reduced. An electrical coupling segment 323 is provided below the abutting portion 321. The electrical coupling segment 323 continuously and obliquely extends from below the abutting portion 321. The maximum distance between the electrical coupling segment 323 and the electronic card 200 can be effectively controlled. Not only does this make the signal terminal 3 forming process simple, but also the distance between the electrical coupling segment 323 and the gold finger 7 gradually changes from the abutting portion 321 as the electrical coupling segment 323 extends. This is conducive to the electrical coupling of the signal terminal 3 from the abutting portion 321 to the gold finger 7 along a distance. The maximum distance D2 between the electrical coupling segment 323 and the surface of the gold finger 7 is less than or equal to 0.19 mm, so as to ensure that the electrical coupling segment 323 and the gold finger 7 can be electrically connected through a small gap capacitance coupling. The electrical coupling segment 323 defines a flat coupling plane 3231, which is conducive to increasing the opposite area of the electrical coupling segment 323 and the gold finger 7 for better capacitance coupling. The distance D3 between the lower end of the electrical coupling segment 323 and the lower end of the gold finger 7 in the up-down direction defines the stub length of the gold finger 7 and is less than or equal to 0.7 mm, so that the stub length of the gold finger 7 is reduced. Therefore, the stub length of the signal terminal 3 and the stub length of the gold finger 7 are simultaneously reduced, which is conducive to inhibiting premature resonance, thereby optimizing the insertion loss at high speed and high frequency and improving the SI performance of the electrical connector 100.

[0049] (2) The included angle a (0.5°-9°) between the coupling plane 3231 and the gold finger 7 is obviously smaller than the included angle between the guide arc surface 3221 and the signal gold finger 7, so that the distance between the coupling plane 3231 and the gold finger 7 changes gently below the abutting portion 321, which is conducive to the good capacitance coupling between the electrical coupling segment 323 and the gold finger 7, thereby reducing the stub length of the gold finger 7. Moreover, only the included angle between the coupling plane 3231 and the gold finger 7 needs to be kept within a small inclination angle a (0.5°-9°) range, without the need for precise control of the electrical coupling segment 323 to keep parallel with the electronic card 200, which facilitates the manufacture of the signal terminal 3.

[0050] (3) the width of the electrical coupling section 323 gradually increases from top to bottom and is greater than the width of the guide section 322, which increases the opposite area of the coupling plane 3231 and the gold finger 7, thereby facilitating the electrical coupling between the electrical coupling section 323 and the gold finger 7, and the lateral distance between the two electrical coupling sections 323 of the two signal terminals 3 in the differential signal pair gradually decreases from top to bottom and is less than the distance between the two guide sections 322, so that the two electrical coupling sections 323 are tightly coupled to reduce the crosstalk interference of the signal terminal 3.

[0051] (4) the shielding sheet 6 is provided with a flat plate portion 61 corresponding to the side of the main body portion 31 of the plurality of signal terminals 3 close to the slot 11, which reduces the crosstalk interference between the plurality of signal terminals 3 on both sides of the slot 11, and a shielding portion 62 is inclined and extended upward from the upper end of the flat plate portion 61 corresponding to each differential signal pair, so that the shielding portion 62 shields one side of the two extension sections 324 of the differential signal pair and is spaced apart from the two extension sections 324, thereby increasing the shielding area of the shielding sheet 6 to the signal terminal 3 and further reducing the crosstalk interference between the plurality of signal terminals 3, and the width of the shielding portion 62 is greater than the distance between the outer sides of the two extension sections 324, which strengthens the shielding effect of the shielding portion 62 to the signal terminal 3.

[0052] (5) two conductive extension portions 512 are provided on the left and right sides of each differential signal pair, and since the conductive plastic 51 is composed of a lossy material, the two conductive extension portions 512 can further isolate the noise signal between different differential signal pairs to reduce the crosstalk interference.

[0053] (6) the shielding portion 62 of the shielding sheet 6 is isolated between the signal terminal 3 and the conductive extension portion 512 in the front-rear direction, so as to avoid the conductive extension portion 512 from excessively absorbing the signal transmitted by the signal terminal 3 to the receiving end (such as a system), and the height of the shielding portion 62 is higher than the height of the conductive extension portion 512, so as to have a good blocking effect, optimize the insertion loss of the electrical connector 100, and improve the SI performance of the electrical connector 100.

[0054] The above detailed description is only for the preferred embodiment of the present application, and does not limit the patent scope of the present application, therefore, any equivalent technical changes made according to the content of the present application are included in the patent scope of the present application.

Claims

1. A signal terminal for contacting the gold fingers on the surface of an electronic card to transmit high-speed signals, characterized in that, The application relates to a connector, which comprises a main body, a flexible arm and a guide connecting part, wherein the flexible arm is provided with a contact part which is mechanically contacted and electrically connected with a golden finger, the flexible arm is provided with a guide section which is obliquely extended to the end of the contact part, the distance between the contact part and the end of the flexible arm is less than or equal to 1.0 mm, the flexible arm is provided with an electrically coupled section which is obliquely extended on the other side of the contact part, the electrically coupled section is provided with a coupling plane which faces the surface of the golden finger, the maximum distance between the coupling plane and the golden finger is less than or equal to 0.19 mm, the electrically coupled section and the golden finger are electrically coupled to realize electrical connection, and the distance between the end of the electrically coupled section which is far away from the guide section and the end of the golden finger which is far away from the guide section is less than or equal to 0.7 mm. The contact part is linearly contacted with the golden finger, the guide section defines a guide curved surface which is located on one side of the contact part, the coupling plane is located on the other side of the contact part and is obliquely arranged relative to the golden finger, and the included angle between the coupling plane and the golden finger is less than the included angle between the guide curved surface and the golden finger.

2. The signal terminal of claim 1, wherein: The included angle between the coupling plane and the golden finger is 0.5-9 degrees.

3. The signal terminal of claim 2, wherein: The guide curved surface is gradually curved along the outer surface of the guide section, the contact part is located at the intersection of the guide curved surface and the coupling plane, and the left and right sides of the guide section and the electrically coupled section are provided with circular arc chamfers.

4. The signal terminal of claim 2, wherein: An extension section is obliquely extended from one end of the electrically coupled section and connected to the main body, the extension length of the electrically coupled section is 0.5-1.5 mm, the end of the electrically coupled section which is far away from the guide section is higher than the end of the golden finger which is far away from the guide section, the extension section extends beyond the golden finger, and the included angle between the extension section and the golden finger is greater than the included angle between the coupling plane and the golden finger.

5. The signal terminal of claim 1, wherein: The application relates to a connector, which comprises a main body, a flexible arm and a guide connecting part, wherein the flexible arm is provided with a contact part which is mechanically contacted and electrically connected with a golden finger, the flexible arm is provided with a guide section which is obliquely extended to the end of the contact part, the distance between the contact part and the end of the flexible arm is less than or equal to 1.0 mm, the flexible arm is provided with an electrically coupled section which is obliquely extended on the other side of the contact part, the electrically coupled section is provided with a coupling plane which faces the surface of the golden finger, the maximum distance between the coupling plane and the golden finger is less than or equal to 0.19 mm, the electrically coupled section and the golden finger are electrically coupled to realize electrical connection, and the distance between the end of the electrically coupled section which is far away from the guide section and the end of the golden finger which is far away from the guide section is less than or equal to 0.7 mm.

6. An electrical connector for electrically connecting to a gold finger of an electronic card, the electrical connector comprising: The contact part is linearly contacted with the golden finger, the guide section defines a guide curved surface which is located on one side of the contact part, the coupling plane is located on the other side of the contact part and is obliquely arranged relative to the golden finger, and the included angle between the coupling plane and the golden finger is less than the included angle between the guide curved surface and the golden finger. The included angle between the coupling plane and the golden finger is 0.5-9 degrees. The extension length of the electrically coupled section is 0.5-1.5 mm.

7. The electrical connector of claim 6, wherein: The width of the electrically coupled section gradually increases from top to bottom, the transverse distance between the two electrically coupled sections of the two signal terminals which constitute the differential signal pair gradually decreases from top to bottom.

8. The electrical connector of claim 6, wherein: ​ 9. The electrical connector of claim 6, wherein: ​ 10. The electrical connector of claim 6, wherein: The insulating body is provided with a plurality of signal terminal receiving grooves, two signal terminals constituting a differential signal pair are received in two adjacent signal terminal receiving grooves, the two adjacent signal terminal receiving grooves are communicated along the left-right direction, two extension sections of the two signal terminals are located in the two communicated signal terminal receiving grooves and exposed on one side of the slot, a shielding sheet is fixed to the insulating body and includes a flat plate part shielding one side of the two main body parts, a shielding part is extended upward from the flat plate part corresponding to the differential signal pair and enters the two communicated signal terminal receiving grooves, the shielding part shields and is arranged in a spaced manner with the two extension sections exposed on one side of the slot, the width of the shielding part along the left-right direction is greater than the distance between the two outer sides of the two extension sections of the two signal terminals.

11. The electrical connector of claim 10, wherein: A plurality of signal terminals and a plurality of ground terminals are assembled on the insulating body by two insulating seats, the insulating body is provided with a plurality of signal terminal receiving grooves and a plurality of ground terminal receiving grooves corresponding to the elastic arms of the signal terminals and the elastic arms of the ground terminals on both sides of the slot, an installation groove is concavely arranged upward from the bottom of the insulating body, a plug is received in the installation groove and located between the two insulating seats, the plug includes at least conductive plastic, a plurality of clamping grooves are concavely arranged on one side of each insulating seat corresponding to the plurality of ground terminals, a plurality of clamping parts are protrudingly arranged on both sides of the conductive plastic, the plurality of clamping parts are respectively received in the plurality of clamping grooves and abut the plurality of ground terminals one by one.

12. The electrical connector of claim 11, wherein: The shielding sheet is inserted and fixed between the plug and the insulating seat, the installation groove is communicated upward with the plurality of ground terminal receiving grooves and the signal terminal receiving grooves, the plug further includes insulating plastic, an insulating isolation part of the insulating plastic is protrudingly arranged corresponding to the differential signal pair and enters the two communicated signal terminal receiving grooves, a conductive extension part of the conductive plastic is protrudingly arranged corresponding to the ground terminal and enters the ground terminal receiving groove, the width of the insulating isolation part is greater than the width of the conductive extension part, the height of the shielding part along the up-down direction is higher than the height of the conductive extension part.

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