Elastic terminal, manufacturing method thereof and electric connection structure

Abstract

The invention provides an elastic terminal, a manufacturing method of the elastic terminal and an electric connection structure comprising the elastic terminal, the elastic terminal comprises a cylinder part extending vertically and longitudinally, and the upper end of the cylinder part is closed by a top part; the leg parts generally extend downwards along the longitudinal direction from the lower end of the cylinder part, each leg part comprises a main body part, a first arched part, a first electric connection part and a guide part which are integrally connected from top to bottom, and the first arched part is arched towards the radial outer side relative to the main body part and the first electric connection part; the lower end of the guide part obliquely extends towards the radial inner side relative to the upper end; a gap is formed between every two adjacent leg parts in the circumferential direction; wherein an opening is formed in the center of the middle of the top, and a notch longitudinally penetrating through the inner side and the outer side of the cylinder part is formed in the cylinder part; the upper end of the notch extends to the opening, and the lower end of the notch extends to the gap.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to an elastic terminal and a manufacturing method thereof, as well as an electrical connection structure. Background Art

[0002] In some electronic products not limited to sensors, it is necessary to protect the internal components, such as electronic module assemblies, by a housing. These components are usually assembled to the main housing, and then need to be isolated by a cover. The electronic module assembly usually transmits signals and / or power in a wired manner through terminals. These terminals can be fixed to the main housing, and one end of the inner side thereof is electrically connected to the electronic module assembly through a lead; or they can be fixed to the cover, and before the cover is assembled to the main housing, it may be electrically connected to the electronic module assembly through a flexible board. One solution is to use elastic terminals such as spring pins (POGOPIN) and electrical contact springs to simultaneously electrically connect to the electronic module assembly in an electrical contact manner while assembling the cover to the main housing in a certain direction, thereby providing elasticity along the installation direction to compensate for the size difference. As shown in CN102297742A and KR20160001863A, a pressure sensor is disclosed, which is formed by axially pressing a stepped spring toward one side of the main housing through a stepped hole formed in a terminal button, so that the inner end of the spring is electrically contacted to the electronic module assembly toward one side of the housing. This type of helical spring type elastic terminal has many advantages, but at the same time, its terminal hole cannot be closed and sealed, so it has high requirements for the use environment, such as dry air and dust-free environment. Otherwise, external moisture or dust will enter the shell, causing serious consequences such as chemical erosion. Moreover, the manufacturing process of this type of helical spring itself is relatively complicated, and the manufacturing cost is relatively high. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present application provides a resilient terminal to solve at least one of the above-mentioned defects.

[0004] To achieve the above objectives, the present application provides a resilient terminal, which includes:

[0005] A cylindrical portion extending longitudinally up and down, the upper end of the cylindrical portion being closed by a top portion;

[0006] and a plurality of legs extending generally downward in the longitudinal direction from the lower end of the barrel, which comprises, from top to bottom, an integrally connected main body, a first arched portion, a first electrical connection portion and a guide portion, the first arched portion arches radially outward relative to the main body and the first electrical connection portion, and the lower end of the guide portion extends radially inwardly relative to the upper end; a gap is formed between two circumferentially adjacent legs;

[0007] An opening is arranged at the center of the middle part of the top, and a slot is arranged on the cylinder part which runs longitudinally through both sides of the cylinder part; the upper end of the slot extends to the opening, and the lower end extends to the gap.

[0008] Preferably, the leg has a circumferential curvature.

[0009] Preferably, the guide portion extends along a conical surface with the top of the cone facing downward or a bowl-shaped plane with the mouth of the bowl facing upward.

[0010] Preferably, the first electrical connection portion extends along the conical surface or the bowl-shaped plane.

[0011] Preferably, it further includes a second arched portion integrally connected between the first electrical connecting portion and the guide portion.

[0012] Preferably, the lower edge of the first arched portion has a substantially horizontal second electrical connection portion and / or the upper edge of the second arched portion has a substantially horizontal third electrical connection portion.

[0013] The present invention also claims protection for an electrical connection structure, which comprises:

[0014] A circuit board extending laterally, the circuit board having at least one metalized via;

[0015] and the elastic terminal mentioned above, wherein the first electrical connection portion of the elastic terminal is inserted into the metallized via hole facing downward;

[0016] Wherein, before the first electrical connection part is inserted into the metallized via, the bottom end of the guide part is located on the inner side of the metallized via; during insertion, the guide part is gradually retracted by the metallized via; after the first electrical connection part is inserted into the metallized via, the first electrical connection part of the elastic terminal is electrically contacted and or welded to the metallized via.

[0017] The present invention also claims protection for an electrical connection structure, which comprises:

[0018] A circuit board extending transversely, the circuit board having at least one metallized via hole, the metallized via hole comprising a hole wall portion;

[0019] and the elastic terminal mentioned above, wherein the first electrical connection portion of the elastic terminal is inserted into the metallized via hole facing downward;

[0020] Among them, before the first electrical connection part is inserted into the metallized via, the bottom end of the guide part is located on the inner side of the metallized via; when the first electrical connection part is inserted into the metallized via, the guide part and the second arched part are successively gradually retracted by the metallized via, and during the retraction process, the guide parts of the multiple legs do not interfere with each other or leave gaps; after the first electrical connection part is inserted into the metallized via, the first electrical connection part of the elastic terminal is electrically contacted and or welded to the metallized via.

[0021] Preferably, after the leg of the elastic terminal is inserted downward into the metallized via, at least one of the second electrical connection portion and / or the third electrical connection portion is also electrically connected or welded to a flat portion formed by the hole wall portion extending along a corresponding side surface of the circuit board.

[0022] The present invention also claims a method for manufacturing the elastic terminal, which comprises:

[0023] Provide a flat plate member, comprising a rectangular portion, a trapezoidal portion formed by contracting a short side of the rectangular portion outward, and a plurality of parallel straight legs formed by extending the other short side of the rectangular portion vertically toward the other side; wherein the straight legs are perpendicular to the short side of the flat plate member;

[0024] stamping the straight leg portion to form the leg portion;

[0025] Rolling the rectangular portion to form the cylindrical portion with the notch and a tapered cylindrical portion corresponding to the top;

[0026] The conical cylindrical portion is punched to form a top portion with the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1( a ) and FIG. 1( b ) respectively show a three-dimensional view and a longitudinal cross-sectional view of the elastic terminal of the first embodiment;

[0028] 2(a) and 2(b) respectively show a three-dimensional view and a longitudinal cross-sectional view of the elastic terminal of the second embodiment;

[0029] 3(a) and 3(b) are schematic diagrams showing the elastic terminal of the first embodiment before and after it is connected to a circuit board, respectively;

[0030] FIG4( a) shows a longitudinal cross-sectional view of a resilient terminal of a third embodiment;

[0031] 4( b ) and 4( c ) are schematic diagrams showing the elastic terminal of the third embodiment before and after it is connected to a circuit board, respectively;

[0032] 5(a) and 5(b) respectively show a three-dimensional view of the elastic terminal of the fourth embodiment and a schematic diagram after being connected to a circuit board;

[0033] 6(a) and 6(b) respectively show a three-dimensional view of the elastic terminal of the fifth embodiment and a schematic diagram after being connected to a circuit board;

[0034] FIG. 7( a ), FIG. 7( b ), FIG. 7( c ), and FIG. 7( d ) are schematic diagrams showing the elastic terminal of the first embodiment at different manufacturing stages, respectively;

[0035] 7(a), 7(b), 7(c) and 7(e) are schematic diagrams showing the elastic terminal of the second embodiment at different manufacturing stages respectively;

[0036] 8(a), 8(b), 8(c) and 8(d) are schematic diagrams showing the elastic terminal of the fourth embodiment at different manufacturing stages respectively;

[0037] 8(a), 8(b), 8(c) and 8(e) are schematic diagrams showing the elastic terminal of the fifth embodiment at different manufacturing stages respectively;

[0038] Figure 9(a) to Figure 9(d) Schematic diagrams showing the elastic terminal of the sixth embodiment in different manufacturing stages respectively;

[0039] Figure 10(a) to Figure 10(e) Schematic diagrams showing the elastic terminal of the seventh embodiment in different manufacturing stages respectively;

[0040] Fig.11 A three-dimensional diagram showing a mold core that can be used in the manufacturing process of the elastic terminal of the seventh embodiment;

[0041] Fig.12 A combined stereogram of a mold core and an elastic terminal that can be used in the manufacturing process of the elastic terminal of the seventh embodiment is shown;

[0042] Fig.13 A perspective view of an elastic terminal according to an eighth embodiment is shown;

[0043] Description of reference numerals: 101, elastic terminal; 102, elastic terminal; 103, elastic terminal; 104, elastic terminal; 105, elastic terminal; 106, elastic terminal; 107, elastic terminal; 108, elastic terminal; 11, leg; 13, barrel; 14, top; 12, gap; 111, main body; 112, first electrical connection; 113, arched portion; 114, guide portion; 115, bottom end; 1131, first arched portion; 1132, second arched portion; 1133, second electrical connection; 1134, third electrical connection; 17, lower end; 117, circumferential extension portion; 116, final gap; 2, circuit board; 21, metallized via; 21a, hole wall portion; 21b, flat portion; 1a, Disk; 15a, root; 11a, straight leg; 101a, flat piece; 14a, top; 13a, barrel; 15b, phase connection; 115a, outer end; 111a, main body; 112a, first electrical connection; 113a, arched portion; 114a, guide; 14b, trapezoidal portion; 13b, rectangular portion; 111b, main body; 112b, first electrical connection; 113b, arched portion; 114b, guide; 131, notch; 141b, tapered portion; 142b, opening; 141, opening; 3, core; 33, first column; 331, second column; 334, transition portion; 332, lower portion; 335, spiral protrusion; 333, positioning rib; 336, third column. DETAILED DESCRIPTION

[0044] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0048] Please refer to Figures 1(a), 1(b), and 7(d). The first embodiment provides an integrated thin-shell elastic terminal 101, which includes a barrel 13 extending longitudinally up and down, and the upper end of the barrel 13 is closed by a top 14. The top 14 may be dome-shaped. The lower end 17 of the barrel 13 extends downward generally longitudinally to form four legs 11 that are equally spaced in the circumferential direction. There is a gap 12 between the four legs 11. Among them, the leg 11 includes, from top to bottom, an integrally connected main body 111, an arched portion 113, a first electrical connection portion 112, and a guide portion 114. The arched portion 113 arches radially outward relative to the main body 111 and the first electrical connection portion 112. The lower end of the guide portion 114 extends radially inwardly relative to the lower end. For example, the projection of the outer wall of the guide portion 114 in the longitudinal direction through the axis thereof may be straight. In this case, the guide portion 114 extends along a cone surface with the top of the cone facing downward. In other embodiments, the projection of the outer wall of the guide portion 114 in the longitudinal direction through the axis thereof may also be an arc. In this case, the guide portion 114 extends along a bowl-shaped plane with the mouth of the bowl facing upward. In other embodiments, the projection of the outer wall of the guide portion 114 in the longitudinal direction through the axis thereof may also be other suitable shapes. The main body 111 and the first electrical connection portion 112 of the four legs 11 may be on the same cylindrical surface as the barrel 13.

[0049] Please refer to FIG. 3(a) and FIG. 3(b). When the elastic terminal 101 of the first embodiment is connected to a circuit board 2 extending laterally to form an electrical connection structure, the leg 11 of the elastic terminal 101 can be inserted downward into a metallized via 21 formed on the circuit board 2, and the metallized via 21 is preferably facing upward and directly opposite to the elastic terminal 101. The metallized via 21 at least includes a hole wall portion 21a and a circle of flattened portion 21b extending from the upper end of the hole wall portion 21a along the upper side surface of the metallized via 21. The flattened portion 21b is connected to the circuit provided on the upper side of the circuit board 2. It can be seen that the guide portion 114 can make the lower end of the leg 11 easily inserted into the hole wall portion 21a. During the insertion of the hole wall portion 21a, the hole wall portion 21a exerts a closing force on the guide portion 114 so that the guide portion 114 is continuously closed radially inward, and the leg portion 11 is bent inward or as a whole from the root (the junction with the barrel portion 13), and finally the lower edge of the arched portion 113 can contact or press against the circuit board 2 or the flat portion 21b, thereby being longitudinally positioned. In this way, the arched portion 113 can not only play a positioning role, but also can reduce the contact impedance by increasing the electrical contact area when it contacts the flat portion 21b. In FIG. 3( b), in the final state of being connected to the metallized via 21, after being gathered and bent at a certain angle by the metallized via 21, the first electrical connection portion 112 is not completely vertical, and only the upper portion thereof is in contact with the hole wall portion 21a; however, in some other schemes, the shape of the first electrical connection portion 112 (the final angle after being connected to the metallized via 21) can be pre-designed to be completely vertical in the final state according to the distance of the circuit board 2 and the inner diameter of the metallized via 21; for example, the lower end of the first electrical connection portion 112 can be tilted outward at an appropriate angle relative to the upper end, and the angle can be roughly equal to the angle at which the lower end of the leg 11 is gathered and bent during the process of being inserted into the metallized via 21.

[0050] Please refer to Figure 2(a), Figure 2(b), and Figure 7(e). In a second embodiment, a resilient terminal 102 is compared with the resilient terminal 101 of the first embodiment. The four legs 11 can be formed by bending the legs 11 of the resilient terminal 101 inwardly at a certain angle from the root, so that at least the lower end of the first electrical connection portion 112 extends radially inwardly at a certain angle relative to the upper end thereof and in the longitudinal direction. The guide portion 114 has the same inclination angle as the first electrical connection portion 112, and the lower portion of the first electrical connection portion 112 (i.e., the guide portion 114) does not need to be specially formed, and the force between the lower portion and the hole wall portion 21a can provide a retracting force. Compared with the first embodiment, the legs 11 of the second embodiment are bent inwardly from the root when connected to the metallized via 21, so that the lower end of the first electrical connection portion 112 is inclined radially inwardly relative to the lower end.

[0051] In particular, for ease of manufacture, the main body 111 and the first electrical connection portion 112 of the four legs 11 have the same inclination angle, and are all located on a cone surface with the top of the cone facing downward and the top angle of the cone being an acute angle α. The elastic terminal 102 can be obtained by bending the legs 11 of the elastic terminal 101 inward from the root at an angle of 0.5α.

[0052] Please refer to the figure Figure 4(a) to Figure 4(c) . Compared with the elastic terminal 102 of the second embodiment, a spring terminal 103 of the third embodiment has a second arched portion 1132 arched radially outwardly formed between the first electrical connection portion 112 and the guide portion 114. When the four legs 11 are inserted downwardly into the metallized via 21 of the circuit board 2, the guide portion 114 provides a retracting force. When the radially outer maximum outer diameter of the second arched portion 1132 contacts the hole wall portion 21a, the lower end of the leg 11 stops retracting; when the leg 11 continues to move downward until the second arched portion 1132 contacts the lower edge of the metallized via 21, the second arched portion 1132 is released by the metallized via 21, the retracting force disappears, and the lower end of the leg 11 rebounds radially outwardly until the first electrical connection portion 112 contacts the hole wall portion 21a. Finally, the outer side of the first electrical connection portion 112 contacts the hole wall portion 21a to form an electrical contact.

[0053] The lower edge of the first arched portion 1131 may form a second electrical connection portion 1133 that is substantially horizontal and electrically contacts the flat portion 21b. In some other solutions, preferably, the metallized via 21 further includes another flat portion 21c located on the lower surface of the circuit board 2, and the upper edge of the second arched portion 1132 may form a third electrical connection portion 1134 that is substantially horizontal and electrically contacts the flat portion 21c. In this way, the leg 11 and the metallized via 21 may form a firm and low-impedance electrical connection. The second electrical connection portion 1133 and the second arched portion 1132 may also be provided alternatively.

[0054] The elastic terminal in each of the above embodiments can compensate for the longitudinal dimension by deforming the leg 11, that is, forming elasticity in the longitudinal direction. For the metallized via 21 with an appropriate inner diameter, in order to ensure the effective guidance of the guide portion 114, it is best to make the outer diameter of the bottom end 115 of the guide portion 114 smaller than the inner diameter of the metallized via 21, and the first electrical connection portion 112 and all parts of its lower side (such as the second arched portion 1132) should not interfere with each other before being completely retracted downward to the hole wall portion 21a, for example, they can abut or leave a moderate gap 116 that can be further retracted.

[0055] Please refer to Figure 5(a) and Figure 5(b). In a fourth embodiment, a resilient terminal 104, compared with the resilient terminal 101 of the first embodiment, has a leg 11 extending spirally downward, and the corresponding spiral inclination angle (i.e., the angle between the spiral extension direction and the axial direction) is θ. In this way, the overall length of the leg 11 can be increased to improve its torsional deformation ability. The central axis of the main body 111 of the resilient terminal 101 is located on a cylindrical surface having the same cross-section from top to bottom. In particular, the cylindrical surface mentioned in this embodiment can be a cylindrical surface.

[0056] Please refer to FIG. 6(a) and FIG. 6(b). A resilient terminal 105 of the fifth embodiment has a leg 11 that spirally extends downwards compared to the resilient terminal 105 of the fifth embodiment, and the corresponding spiral inclination angle is θ. This can increase the overall length of the leg 11 to improve its torsional deformation capability. The central axis of the main body 111 of the resilient terminal 101 is located on a conical surface having a linearly decreasing cross section from top to bottom. The first electrical connection portion 112 and the guide portion 114 can be on the same surface without a clear boundary.

[0057] For the elastic terminal 101 of the first embodiment, the present invention provides a first manufacturing method. Figure 7(a) to Figure 7(d) , the above-mentioned first production method may include:

[0058] S1. Provide a plate-like flat piece 101a, which includes a disc 1a having an outer diameter substantially equal to that of the cylinder 13, and two straight legs 11a corresponding to the legs 11 extending horizontally from each of the left and right sides of the disc 1a toward the left and right outer sides, and the roots 15a of the straight legs 11a are arranged at equal intervals in the circumferential direction of the disc 1a; the flat piece 101a is easily punched out from a sheet material.

[0059] S2, punching the middle portion of the disc 1a upward to form a top portion 14 and a barrel portion 13;

[0060] S3, stamping the straight leg portion 11a to form an arched portion 113 and a guide portion 114;

[0061] S4, twisting the straight leg portion 11a from the root portion 15a on a horizontal plane until the central axis of the straight leg portion 11a is collinear with the radial direction of the barrel portion 13, i.e., the position indicated by the dotted line in FIG. 7(c);

[0062] S5, fold the straight leg 11a downward along the root 15a by 90°, and finally obtain the elastic terminal 101. As shown in Figures 8(b) and 8(c), after being folded by 90°, the circumference of the outer end 115a of the straight leg 11a is folded from the dotted line position shown in Figure 8(b) to the dotted line position shown in Figure 8(c).

[0063] The order of the above steps S2, S3 and S4 can be changed at will, and steps S2 and S3 can also be performed simultaneously.

[0064] When the folding angle in step S5 of the above method is an obtuse angle (specifically 90°+0.5α), it is suitable for forming the elastic terminal 102 .

[0065] If step S4 in the above method is omitted, another elastic terminal can be obtained. Compared with the elastic terminal 101, the four legs 11 of the elastic terminal are not equally spaced in the circumferential direction, that is, the four legs are located two by two on opposite sides of the circumferential direction of the barrel. Of course, the four straight legs 11a can also be radially connected to the disc 1a in the initial state, that is, as shown by the dotted lines in Figure 7 (c), but this will greatly reduce the utilization rate of the plate.

[0066] The first manufacturing method is also applicable to the elastic terminal 103 of the third embodiment, and the two first arched portions 1131 and the second arched portions 1132 thereof can be formed together in the step S3.

[0067] For the elastic terminal 102 of the second embodiment, the present invention provides a second manufacturing method. Figure 8(a) to Figure 8(d) , the above-mentioned second production method may include:

[0068] K1. Provide a plate-shaped flat piece 104a, which may include a disc 1a having an outer diameter substantially equal to that of the barrel 13, and four straight legs 11a connected by the disc 1a and one end to the outer edge of the disc 1a, wherein the angle between the center axis of the straight leg 11a and the tangent direction at its root 15a is γ, or in other words, the angle between the center axis of the straight leg 11a and the radial direction at that location is the above-mentioned spiral camber angle θ, wherein γ and θ are complementary angles to each other; the flat piece 104a is easily punched out from a sheet.

[0069] K2, punching the middle portion of the disc upward to form a top portion 14 and a barrel portion 13;

[0070] K3, stamping the straight leg portion 11a to form an arched portion 113 and a guide portion 114;

[0071] K4. Roll the straight leg 11a along a cylindrical mandrel having an outer diameter substantially equal to the inner diameter of the barrel 13, so that the leg 11 extends substantially in a spiral shape; specifically, only the main body 111 and the first electrical connection portion 112 need to be rolled. The shape of the leg 11 corresponding to a certain state in the middle of the rolling process is shown in the dotted line portion in FIG8(c).

[0072] To improve the utilization rate of the plate material, the flat plate 101a can also be used to make the elastic terminal 104. In this case, step K5 needs to be added: before or after stamping (before step K2 or step K3, or step K4), the straight leg 11a is twisted to form the angle shown in Figure 8 (a).

[0073] The above steps K2, K3 and K5 can be exchanged in any order, and steps S2 and S3 can also be performed simultaneously.

[0074] When the mold core has a conical surface whose outer diameter is substantially equal to the inner diameter of the barrel 13 and whose apex faces downward, it is suitable for molding the elastic terminal 105. The apex angle of the conical surface is β.

[0075] Please refer to FIG. 9(d). Based on the elastic terminal 101 of the first embodiment, the elastic terminal 106 of the sixth embodiment may further have an opening 141, preferably circular, at the center of the top 14, and a notch 131 is provided on the wall of the barrel 13, which longitudinally penetrates both sides of the barrel 13, and the upper end of the notch 131 extends to the opening 141. The lower end of the notch 131 extends to the gap 12. Although this makes the top 14 unable to be closed and may allow water vapor to pass through, it can greatly simplify the molding of the elastic terminal 106.

[0076] Please refer to Figure 9(a) to Figure 9(c) The present invention also provides a third manufacturing method applicable to the elastic terminal 106, which comprises:

[0077] P1. Provide a flat plate 106a, which includes a rectangular portion 13b, a trapezoidal portion 14b formed by contracting one short side of the rectangular portion 13b outward, and a plurality of parallel straight legs 11b formed by extending the other short side of the rectangular portion 13b vertically toward the other side. The straight legs 11b are perpendicular to the short sides of the flat plate 106a. The length of the rectangular portion 13b corresponds to the height of the barrel 13, and the width corresponds to the circumference of the barrel 13; the length of the straight legs 11b is approximately equal to the length of the legs 11.

[0078] P2. Punching the straight leg portion 11b to form the leg portion 11 including the main body portion 111b, the arched portion 113b, the first electrical connection portion 112b and the guide portion 114b;

[0079] P3, rolling the rectangular portion 13b along a cylindrical surface whose outer diameter is equal to the inner diameter of the cylindrical portion 13 to form the cylindrical portion 13 and a conical cylindrical portion 141b corresponding to the top portion 14;

[0080] P4. Punch the tapered cylindrical portion 141 b to form the final top portion 14.

[0081] In some other solutions, the terminal directly obtained from step P3 may not be processed in step P4, and a resilient terminal as shown in FIG. 9( c ) may be obtained.

[0082] Please refer to FIG. 10(e). Based on the elastic terminal 102 of the second embodiment, the elastic terminal 107 of the seventh embodiment may further have a circular opening 141 on the top 14, and a notch 131 is provided on the barrel 13, which longitudinally penetrates both sides of the barrel 13, and the upper end of the notch 131 extends to the opening 141. The lower end of the notch 131 extends to the gap 12. Although the top 14 cannot be closed and water vapor may pass through, the molding of the elastic terminal 106 can be greatly simplified.

[0083] Please refer to Figure 10(a) to Figure 10(d) The present invention also provides a third manufacturing method applicable to the elastic terminal 107, which comprises:

[0084] T1. Provide a flat plate 107a, which includes a rectangular portion 13b, a trapezoidal portion 14b formed by contracting one short side of the rectangular portion 13b outward, and a plurality of parallel straight legs 11b formed by extending the other short side of the rectangular portion 13b obliquely toward the other side. The length of the rectangular portion 13b corresponds to the height of the barrel 13, and the width corresponds to the circumference of the barrel 13; the length of the straight legs 11b is substantially equal to the length of the legs 11. The straight legs 11b are all inclined along the same short side, and the inclination angle is θ.

[0085] T2, stamping the straight leg portion 11b to form the leg portion 11 including the main body portion 111b, the arched portion 113b, the first electrical connection portion 112b and the guide portion 114b;

[0086] T3, rolling the rectangular portion 13b to form a cylindrical portion 13 with a notch 131 and a conical cylindrical portion 141b corresponding to the top 14; an opening 142b corresponding to the opening 141 is formed at the upper end of the conical cylindrical portion 141b;

[0087] T4. Punch the tapered cylindrical portion 141 b to form a top portion 14 with an opening 141 .

[0088] T5. Roll the straight leg 11a along a cylindrical core having an outer diameter substantially equal to the inner diameter of the barrel 13, so that the leg 11a generally extends in a spiral; specifically, only the main body 111 and the first electrical connection portion 112 need to be rolled. The cylindrical surface is the side surface of the core;

[0089] In some other solutions, the state shown in FIG. 9( c ) can also be formed into the elastic terminal 107 shown in FIG. 10( e ) through a mold core 3 . Fig.11 The mold core 3 may include a first column 33 extending longitudinally, and the upper end of the first column 33 may extend upward to form a second column 331 having an outer diameter substantially equal to the inner diameter of the opening 141. The top of the first column 33 is connected to the second column 331 through a transition portion 334 matching the inner surface of the top 14. A plurality of spiral protrusions 335 equal in number to the leg 11 are formed on the lower portion 332 of the first column 33, and these spiral protrusions 335 are arranged at equal intervals on the surface of the lower portion 332 in the circumferential direction, and a spiral groove (not marked) matching the shape of the leg 11 of the elastic terminal 107 is formed between two circumferentially adjacent spiral protrusions 335. The lower end of the lower portion 332 may extend downward to form a third column 336, and the outer diameter of the third column 336 is equal to the diameter of the inscribed circle of the inner wall of the bottom end 115 of the guide portion 114, thereby limiting the lower end of the guide portion 114. The outer wall of the positioning convex rib 333 is provided with a longitudinally extending first column 33, and the positioning convex rib 333 is used to position the two long sides of the rectangular portion 13b during molding to form the notch 131. The first column 33, the third column 336 and the second column 331 are preferably coaxially arranged.

[0090] The outer diameter of the first column 33 is equal to the inner diameter of the barrel 13, and the height of the upper edge of the spiral protrusion 335 from the lower edge of the transition portion 334 is equal to the height of the barrel 13. Fig.12 When the semi-finished elastic terminal shown in Figure 9(c) is downwardly sleeved on the mold core 3, the main body 111 of the vertical leg 11 and the first electrical connection portion 112 can be forced downwardly into the corresponding spiral groove by a pressure ring, thereby obtaining the elastic terminal 107.

[0091] See also Fig.13 The elastic terminal 108 of the eighth embodiment, based on the elastic terminal 107 of the seventh embodiment, can extend the first electrical connection portion 112 and the guide portion 114 along one side of the circumferential direction to form an arc-shaped circumferential extension portion 117. In this way, when connecting with the metallized via 21, a larger contact area with the metallized via 21 can be increased, thereby reducing the contact impedance. In some other solutions, the arched portion 113 can also be omitted.

[0092] It should be noted that in the above embodiments, the above-mentioned “cylindrical surface” may be a typical cylindrical surface, but it is easy for a person skilled in the art to understand that the above-mentioned “cylindrical surface” may also be an atypical cylindrical surface, such as a prism surface with a square bottom surface. For example, by stamping, the disc 1a may be stamped into a cylinder 13 whose inner wall matches the prism surface with a square bottom surface, and by rolling, the rectangular portion 13b may be rolled into a cylinder 13 with a notch 131 and a prism surface with a square bottom surface that matches.

[0093] In the above embodiments: the outer wall of the leg 11 may have a circumferential curvature that matches the inner diameter of the hole wall portion 21a, so that the contact area with the hole wall portion 21a can be increased. For a leg of this structure, its curvature can be stamped together in a corresponding stamping step, or can be rolled together in a corresponding rolling step. As shown in Figure 8(b), the width of the arched portion 113 can be greater than the width of other parts of the leg 11, so that its corresponding upper edge or lower edge can form a larger contact area with the metallized via 21. The number of legs 11 can be at least two, and can also be three or more. In some other schemes, the above-mentioned electrical connection portion can be alternatively or additionally electrically connected to the metallized via 21 of the circuit board 2 by welding.

[0094] The scope of the disclosure is defined not by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are construed as being included in the disclosure.

Claims

1. A flexible terminal, characterized in that: include: A cylindrical portion (13) extending longitudinally up and down, wherein the upper end of the cylindrical portion (13) is closed by a top portion (14); and a plurality of legs (11) extending generally downward in the longitudinal direction from the lower end (17) of the barrel (13), which comprise, from top to bottom, an integrally connected main body (111), a first arched portion (1131), a first electrical connection portion (112) and a guide portion (114), wherein the first arched portion (1131) arches radially outward relative to the main body (111) and the first electrical connection portion (112), and the lower end of the guide portion (114) extends radially inwardly relative to the upper end; a gap (12) is formed between two circumferentially adjacent legs (11); An opening (141) is provided at the center of the top (14), and a notch (131) is provided on the barrel (13) and runs longitudinally through both sides of the barrel (13); the upper end of the notch (131) extends to the opening (141), and the lower end extends to the gap (12).

2. The elastic terminal according to claim 1, characterized in that: The leg portion (11) has a circumferential curvature.

3. The elastic terminal according to claim 2, characterized in that: The guide portion (114) extends along a conical surface with the top of the cone facing downward or a bowl-shaped plane with the mouth of the bowl facing upward.

4. The elastic terminal according to claim 3, characterized in that: The first electrical connection portion (112) extends along the conical surface or the bowl-shaped plane.

5. The elastic terminal according to claim 1, characterized in that: It also includes a second arched portion (1132) integrally connected between the first electrical connection portion (112) and the guide portion (114).

6. The elastic terminal according to claim 5, characterized in that: The lower edge of the first arched portion (1131) has a substantially horizontal second electrical connection portion (1133) and / or the upper edge of the second arched portion (1132) has a substantially horizontal third electrical connection portion (1134).

7. An electrical connection structure, characterized in that: include: A circuit board (2) extending laterally, the circuit board (2) having at least one metallized via (21); and the elastic terminal according to any one of claims 1 to 5, wherein the first electrical connection portion (112) of the elastic terminal is inserted into the metallized via (21) facing downward; Wherein, before the first electrical connection portion (112) is inserted into the metallized via hole (21), the bottom end (115) of the guide portion (114) is located inside the metallized via hole (21); during insertion, the guide portion (114) is gradually retracted by the metallized via hole (21); after the first electrical connection portion (112) is inserted into the metallized via hole (21), the first electrical connection portion (112) of the elastic terminal is electrically contacted and / or welded to the metallized via hole (21).

8. An electrical connection structure, characterized in that: include: A circuit board (2) extending transversely, the circuit board (2) having at least one metallized via hole (21), the metallized via hole (21) comprising a hole wall portion (21a); and the elastic terminal according to any one of claims 5 to 6, wherein the first electrical connection portion (112) of the elastic terminal is inserted into the metallized via (21) facing downward; Wherein, before the first electrical connection part (112) is inserted into the metallized via hole (21), the bottom end (115) of the guide part (114) is located on the inner side of the metallized via hole (21); when the first electrical connection part (112) is inserted into the metallized via hole (21), the guide part (114) and the second arched part (1132) are successively gradually retracted by the metallized via hole (21), and during the retracting process, the guide parts (114) of the multiple legs (11) do not interfere with each other or leave gaps; after the first electrical connection part (112) is inserted into the metallized via hole (21), the first electrical connection part (112) of the elastic terminal is electrically contacted and / or welded to the metallized via hole (21).

9. The electrical connection structure according to claim 8, characterized in that: After the leg portion (11) of the elastic terminal is inserted downward into the metallized through hole (21), at least one of the second electrical connection portion (1133) and / or the third electrical connection portion (1134) is also electrically connected or welded to a flat portion (21b) formed by the hole wall portion (21a) extending along a corresponding side surface of the circuit board (2).

10. A manufacturing method for manufacturing the elastic terminal according to any one of claims 1 to 6, characterized in that: include: A flat plate member (107a) is provided, comprising a rectangular portion (13b), a trapezoidal portion (14b) formed by contracting a short side of the rectangular portion (13b) outward, and a plurality of parallel straight leg portions (11b) formed by vertically extending the other short side of the rectangular portion (13b) toward the other side; wherein the straight leg portions (11b) are perpendicular to the short side of the flat plate member (106a); Punching the straight leg portion (11b) to form the leg portion (11); The rectangular portion (13b) is rolled to form the cylindrical portion (13) with the notch (131) and a conical cylindrical portion (141b) corresponding to the top portion (14); The conical cylindrical portion (141b) is punched to form a top portion (14) having the opening (141).

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