WO2021137338A1

WO2021137338A1 - Connector pin that ensures stable contact

Info

Publication number: WO2021137338A1
Application number: PCT/KR2020/000096
Authority: WO
Inventors: 박상량
Original assignee: 박상량
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2021-07-08

Abstract

The present invention relates to a connector pin that ensures stable contact, comprising: a cylindrical casing of which the top is open and the inside is hollow; a plunge that protrudes through an opening of the casing and is arranged so as to be raisable and lowerable in the axial direction; and an elastic member that elastically supports the plunge so as to ensure smooth electrical contact with an external terminal. In particular, the present invention is configured such that the plunger is movable up and down in the axial direction inside the casing while maintaining a state of contact at multiple points with the inner circumferential surface of the casing, such that a stable and shortest electric signal transmission path can be provided.

Description

Connector pins to ensure reliable contact

The present invention relates to a connector pin for ensuring a stable contact, and more particularly to a pogo pin type connector pin configured to ensure a stable contact.

In general, small electronic devices such as mobile phones and tablets are configured to supply power by electrically contacting a terminal body (or a charger body) and a contact terminal of a battery using a pogo pin.

1 and 2 are diagrams schematically showing a pogo pin assembly according to the prior art (Republic of Korea Patent No. 10-0575788), and the pogo pin assembly 300 provided at the inner lower end of the terminal body 200 is connected to the battery. Located at the bottom of the inner side of the pogo pin 310 (which is slightly different from that referred to in the commonly used term 'pogo pin', and corresponds to the probe part in the term 'pogo pin') corresponding to the position of the The point contact with the plate-shaped contact terminal (100a) of the contact terminal assembly (100). Accordingly, the terminal body 200 is supplied with power while maintaining contact with the plate-shaped contact terminal 100a through the elastic support of the pogo pin 310 .

The pogo pin assembly 300 includes a housing 320 that is opened only at the rear entrance, a pogo pin 310 that is inserted into the housing and protrudes the tip through the inlet of the housing, and the bottom surface of the housing and the pogo pin ( 310), and the outer diameter of the support part 310a is slightly smaller than the inner diameter of the inner circumferential surface 320a of the housing 320 as shown.

The elastic member 330 has poor electrical properties because securing its physical properties is a priority. Therefore, through the contact between the inner peripheral surface 320a and the support 310a of the housing 320 in this pogo pin assembly, or through the contact between the inlet 320c and the pogo pin 310 of the housing 320, electrical power or signal is transmitted.

However, in order to ensure smooth vertical movement of the pogo pin 310, between the inner peripheral surface 320a of the housing 320 and the support portion 310a, and between the inlet 320c and the pogo pin 310 of the housing 320 A certain gap is necessarily required for the bar, and for electrical contact, the pogo pin 310 forms an electrical contact depending on the phenomenon in which the pogo pin 310 falls to one side when the elastic member 330 is extruded.

However, the electrical contact formed as described above has a problem in that the contact pressure is not constant and the contact pressure is relatively small.

In addition, since the pogo pin 310 must ensure smooth vertical movement while also ensuring electrical contact, the tolerance allowed during the manufacture of the pogo pin 310 and the housing is very small and requires very high precision.

The present invention was created to solve the above problems, and an object of the present invention is to provide a pogo pin type connector pin that can ensure a constant contact pressure and a higher contact pressure.

Another object of the present invention is to provide a connector pin of a pogo pin type that can relieve tolerances allowed during manufacturing.

In order to achieve the above object, a connector pin for ensuring a stable contact according to a preferred embodiment of the present invention,

a cylindrical casing having a casing body forming a hollow portion, an opening defined by an axial tube portion disposed at an upper end of the casing body portion, and a bottom portion closing the lower end of the casing body portion;

It is arranged so as to be able to move up and down in the opening of the casing, a cylindrical plunger body having an enlarged pipe part around the outer circumferential surface, a probe protruding in the vertical direction from the upper end of the plunger body, and extending downwardly to the lower end of the plunger body. a plunger having a bridge portion, a seating portion extending orthogonally from an end of the bridge portion, and a leg portion extending obliquely downward from the seating portion; and

and an elastic member interposed between the casing and the plunger to elastically support the plunger in the axial direction of the casing, wherein the free end of the leg portion may be in point contact with the inner circumferential surface of the casing body portion.

Preferably, the plunger may be provided with two leg portions extending in length from both ends of the seating portion in the shape of a downward beam.

In the present invention, the outer diameter of the expanded tube portion is formed to be smaller than or equal to the inner diameter of the casing body, while the outer diameter of the expanded tube portion may be formed to be slightly larger than the inner diameter of the shaft tube portion.

In addition, the present invention may be curved in an arc shape toward the inside of the free end of the leg portion.

In the present invention, the plunger can arrange the seating part in the center of the casing body part by bending the bridge part.

Optionally, in the present invention, the spacing between the free ends of the two leg parts has a size larger than the inner diameter of the casing body, so that the free ends of both leg parts are elastically deformed after assembly to continuously point contact with the inner peripheral surface of the casing body. can be

In another embodiment of the present invention, the upper side of the elastic member is configured to be in contact with the inner surface of the two leg parts to elastically support the leg part continuously.

According to the above description of the present invention, the present invention can provide a pogo pin type connector pin configured to maintain a continuous and stable contact state between the plunger and the casing moving up and down along the axial direction.

In particular, the present invention has the effect of not only ensuring smooth lifting and lowering of the plunger elastically supported in the hollow part of the casing as described above, but also allowing a plurality of contacts between the leg part of the plunger and the inner peripheral surface of the casing, and relatively There is an effect of maintaining a high contact pressure, and therefore, there is an effect of improving the electrical reliability of the connector pin.

In addition, the present invention can relax the allowable tolerance during manufacturing by the leg portion of the plunger, and by manufacturing and assembling the casing and the plunger in a unified process, mass production is possible, as well as a reduction in manufacturing cost can be expected.

1 is a cross-sectional view schematically illustrating a power contact structure of a terminal according to the prior art.

FIG. 2 is a cross-sectional view illustrating a part A of FIG. 1 in detail.

3 is a perspective view schematically showing a connector pin for ensuring a stable contact according to a preferred embodiment of the present invention.

FIG. 4 is a partially cut-away perspective view of the casing of the connector pin shown in FIG. 3 , and it is possible to check the arrangement state of each component inside the hollow part of the casing.

FIG. 5 is an exploded perspective view of the connector pin shown in FIG. 3 ;

6 is an exploded view schematically showing a casing and a plunger constituting a connector pin for ensuring a stable contact according to a preferred embodiment of the present invention.

7 is a cross-sectional view schematically illustrating a connector pin for ensuring a stable contact according to another embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and examples taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In this specification, terms such as first, second, etc. are used to distinguish one component from another, and the component is not limited by the terms. In the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not fully reflect the actual size.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 to 6 , the connector pin 1 (hereinafter referred to as connector pin) that ensures stable contact according to a preferred embodiment of the present invention can be mainly used as a battery connector for small electronic devices such as mobile phones and tablets. However, the connector pin 1 according to the present invention is provided in the terminal body (or charger body), and when it comes into contact with the contact terminal (external terminal) of the battery, it ensures reliable electrical communication by elastic deformation of the elastic member to ensure reliable electrical communication. It is configured to reliably transmit signals or currents without loss and distortion. The present invention is not limited thereto, and the present invention may be a component that electrically connects one-to-one in various sockets, including inspection devices such as semiconductor wafers, LCD modules, image sensors, and semiconductor packages.

The connector pin 1 according to a preferred embodiment of the present invention has a hollow cylindrical casing 100 having an opening 120 formed at an upper end thereof, and protrudes through the opening 120 of the casing 100 in the vertical direction. It consists of a plunger 200 (plunger) disposed so as to be liftable (axial direction), and an elastic member 300 (spring) interposed between the casing 100 and the plunger 200 .

Preferably, in the connector pin 1 according to the present invention, the casing 100 and the plunger 200 may be formed of respective metal plates. The connector pin 1 according to the present invention is cut as shown in FIG. 6 by a punching process, for example, of a metal plate having good electrical conductivity, and the cut casing 100 and the plunger 200 are pressed. By the process, the metal plate may be bent, rolled, or wound to form the shape shown in FIG. 5 . This process can be expected to produce an effect that can be manufactured by minimizing the size and shape of the casing and the plunger (in FIGS. 4 and 7, it is shown that there is a thicker part in the circumferential direction in the middle of the casing body 110 in FIGS. , in reality, a metal plate with a constant thickness is implemented in a similar way to create a step by a pressing process, unlike the illustration, so that the thickness can be constant).

The casing 100 is formed in the shape of a hollow cylindrical container with an open upper end as described above, and a generally hollow casing body 110 and an opening 120 formed at the upper end of the casing body 110 . , a bottom portion 130 for closing the lower end of the casing body portion 110 , and a hollow portion 140 defined by the casing body portion 110 and the bottom portion 130 . The opening 120 is defined by a axial tube portion 111 extending radially along the periphery of the upper end of the casing body portion 110 , a hollow portion to allow entry of a component into the hollow portion 140 of the casing. is connected with Here, the shaft tube portion 111 has a diameter smaller than the diameter of the casing body portion 110, but at the leading end thereof, it can be formed in the shape of the upper and lower ridges, so that the lower portion of the plunger 200, which will be described later, can be easily guided into the hollow portion. have.

As shown, the plunger 200 is a constituent member that is freely and vertically disposed within a limited range of the casing 100 , and must be assembled so as not to be separated from the opening 120 of the casing 100 . Specifically, the plunger 200 has a cylindrical plunger body portion 110, a probe portion 220 disposed on the upper end of the plunger body portion 210, and the lower end of the plunger body portion 210 extending downwardly. The bridge part 230, the seating part 240 extending in a direction perpendicular to the longitudinal direction of the bridge part 230 from the end of the bridge part 230, and the seating part 240 being inclined downward toward the outside. It has an elongated leg portion 250 with a slender body. As shown, the plunger 200 may include two or more leg portions 250 . The leg part 250 is integrally connected with the lower end of the plunger body 210 and extends obliquely downward, and the plunger 200 has two leg parts ( 250) may be provided.

The plunger 200 may form a U-shaped inner space through the seating part 240 and the two leg parts 250 . The inner space defined between the seating part 240 and the two leg parts 250 accommodates the upper side of the elastic member 300 to be described below.

In addition, the present invention bends the bridge part 230 to the inside so that the seating part 240 can be arranged in the center of the hollow casing body part 110 . The length L240 of the seating portion 240 has a size smaller than the inner diameter of the hollow casing body 110 .

In the connector pin 1 according to the present invention, the two leg portions 250 are in elastic contact with the inner peripheral surface of the casing body 110 in order to maintain a reliable contact state between the casing 100 and the plunger 200 .

Specifically, the fixed end of the leg part 250 is fixed to the end of the seating part 240 , while the free end of the leg part 250 is in elastic contact with the inner circumferential surface of the casing body part 110 . Before assembling the plunger 200 to the casing 100 in the present invention, the maximum outer diameter between the free ends of the two leg portions 250 is formed larger than the inner diameter size of the casing body portion 110, and the freedom of the leg portion after assembly It helps the end to be in elastic contact with the casing body (see FIG. 7).

Optionally, the free end of the leg portion 250 may be curved inwardly toward the center of the casing body portion 110 in an arc shape. As shown, since the free end of the leg part 250 is curved inward, it is possible to significantly reduce the frictional resistance between the outer surface of the leg part and the casing body part 110 during vertical movement of the plunger 200, and at the same time, the plunger The lower part of the 200, that is, between the two leg portions, prevents the elastic member 300 from being separated and helps to be arranged in the correct position.

The upper side of the elastic member 300 is smaller than the inner space between the two leg parts 250 so that it can be seated on the seating part 240 . Unlike the figure, the upper and lower sides of the elastic member 300 may be formed to be smaller than the diameter of the middle part.

The probe unit 220 may protrude vertically upward from the upper end of the plunger 200 to be formed in a shape that can ensure smooth electrical contact with the external terminal. That is, the probe unit 220 may provide various shapes such as a mountain shape, a crown shape, a cone shape, a hemispherical tip, and the like.

As described above, the present invention has an axial tubular opening 120 in the casing 100 to maintain the engagement of the casing 100 and the plunger 200, while correspondingly the plunger body in the plunger 200. An expansion tube 211 may be provided along the circumference of the outer peripheral surface of the portion 210 . The expanded tube portion 211 has an outer diameter of the same size or smaller than the inner diameter of the casing body portion 110, and the outer diameter of the expanded tube portion 211 is larger than the inner diameter of the shaft tube portion 111 (see FIG. 7). . This enables smooth vertical movement of the plunger body portion 210 within the hollow portion 140 of the casing 100 while restricting the upward movement of the expansion tube portion 211 through the shaft tube portion 111 of the plunger 200. departure can be prevented.

The present invention disposes the elastic member 300 in the hollow portion 140 of the casing 100, specifically, the elastic member between the seating portion 240 of the plunger 200 and the bottom portion 130 of the casing 100. (300) is interposed. As known to those skilled in the art, when the plunger 200 elevates according to the contact of the external terminal, the elastic member 300 expands and contracts according to the elevating action.

When assembling the connector pin 1 according to the present invention, the operator inserts the elastic member 300 into the hollow portion 140 of the casing 100 and then applies an external force to the two leg portions 250 to the casing ( A part of the plunger body part 210 in the axial direction of the casing 100 by narrowing the spacing between the two leg parts 250 so as to be retractable into the hollow part 140 through the opening 120 of the casing 100, specifically It is inserted up to the expansion tube 211, for example, by an interference fit method. As a result, the present invention limits the separation and/or upward displacement of the plunger 200 from the casing by spanning the expanded pipe portion 211 of the plunger 200 on the shaft portion 111 of the casing 100 . Incidentally, in the present invention, the two leg portions 250 pass the axial tube portion 111 having a narrow inner diameter, and the external force is removed within the hollow portion 140 having an inner diameter wider than the inner diameter of the axial tube portion. It is elastically deployed in the outward direction, whereby the two leg portions 250 maintain a multi-point elastic contact state with the inner circumferential surface of the casing body portion 110 . Of course, the upper side of the elastic member 300 is in contact with the seating portion 240 included in the lower portion of the plunger 200 , and the lower side of the elastic member 300 is placed in contact with the bottom portion 130 of the casing 100 . . In the present invention, an elastic force is applied to the plunger 200 through the elastic member 300 , and electrical communication is possible through reliable contact with an external terminal through the elastic support of the plunger 200 .

The present invention can easily achieve the assembly process by sequentially inserting the elastic member and the plunger into the casing as described above, and the casing and the plunger can be molded into a small size by this assembly process and processing methods such as press will provide

The present invention provides an elastic restoring force in the axial direction of the casing while strongly contacting the probe part 220 of the plunger 200 by an external terminal, for example, a contact terminal of a battery. The pressure of the probe part 220 compresses the elastic member 300 , and the plunger 200 moves downward in the hollow part 140 of the casing 100 . Conversely, when the external force is released, the plunger 200 is returned to its original position by the elastic restoring force of the elastic member 300 .

When the probe part 220 moves downward, the leg part 250 of the plunger 200 is displaced adjacent to the bottom part 130 of the casing while continuously maintaining an elastic contact state with the casing body part 110, the present invention The casing body and the leg portion of the plunger are configured to be in electrical communication through multi-point elastic contact, and the probe portion 220 of the plunger 200, the leg portion 250, the casing body portion 110, and the bottom portion of the casing 100 It is possible to provide a path for transmitting current and signals passing through 130 . This makes it possible to reduce the loss and distortion of electrical signals or currents while stably maintaining the transmission path within the connector pin 1 of the present invention.

7 is a cross-sectional view schematically illustrating a connector pin for ensuring a stable contact according to another embodiment of the present invention. The connector pin illustrated in FIG. 7 is another modification of the pogo pin type connector pin illustrated in FIGS. 3 to 6, and has a very similar structure except for the contact state between the elastic member and the leg portion, so the present invention Descriptions of similar or identical components will be excluded here to aid a clear understanding of

The connector pin according to another embodiment of the present invention may further increase the contact force between the free ends of the two leg parts 250 arranged in a downward light shape and the inner circumferential surface of the casing body part 110 . As shown, the plunger 200 extends the length of the leg part 250 in a cantilever structure from both ends of the seating part 240 .

The connector pin according to another embodiment of the present invention is characterized in that the two leg parts 250 are arranged in an elastically supportable manner so that they can be continuously deployed toward the outside by using the elastic force of the elastic member 300 as a means. do it with The diameter D300 of the elastic member 300 is larger than the length L240 of the seating part 240 and has a size smaller than the spacing G250 between the free ends of both leg parts 250 . Accordingly, the present invention is such that the upper side of the elastic member 300 is in contact with the inner surface of the two leg parts 250 without contacting the seating part 240 , and the two leg parts 250 are connected to the casing body through the elastic member. It is possible to maintain a high pressure contact state between the free end of the leg portion and the casing body portion by elastically supporting the portion 110 toward the inner circumferential surface.

Claims

A casing body portion 110 forming a hollow portion 140 , an opening 120 defined by a shaft tube portion 111 disposed at an upper end of the casing body portion 110 , and a lower end of the casing body portion 110 . A cylindrical casing 100 having a bottom 130 to close the;

A cylindrical plunger body part 210 having an expansion pipe part 211 around an outer circumferential surface, and an upper end of the plunger body part 210, which are arranged so as to be able to move up and down in the opening 120 of the casing 100. The probe part 220 protruding in the vertical direction, the bridge part 230 extending in length from the lower end of the plunger body part 210, and the seating part 240 extending vertically from the end of the bridge part 230. , The plunger 200 is integrally connected with the lower end of the plunger body 210 and configured to include two leg portions 250 obliquely extending downwardly from the seating portion 240; and

An elastic member 300 interposed between the casing 100 and the plunger 200 to elastically support the plunger 200 in the axial direction of the casing 100;

The free ends of the two leg parts 250 are in elastic contact with the inner peripheral surface of the casing body part 110,

The diameter (D300) of the elastic member (300) is larger than the length (L240) of the seating part (240) and has a size smaller than the spacing (G250) between the free ends of the two leg parts (250). , characterized in that the upper side of the elastic member 300 is in contact with the inner surface of the two leg parts 250 without contacting the seating part 240 ,

Connector pins to ensure reliable contact.
The method according to claim 1,

The expansion tube portion 211 has an outer diameter of the same size or smaller than the inner diameter of the casing body portion (110),

The expanded pipe portion 211 has an outer diameter larger than the inner diameter of the shaft tube portion 111,

Connector pins to ensure reliable contact.
The method according to claim 1,

In the plunger 200, the bridge part 230 is bent to arrange the seating part 240 in the center of the casing body part 110,

Connector pins to ensure reliable contact.
The method according to claim 1,

The free ends of the two leg parts 250 are curved inward,

The maximum outer diameter between the free ends of the two leg portions 250 is formed larger than the inner diameter size of the casing body portion 110,

Connector pins to ensure reliable contact.
The method according to claim 1,

At least the plunger 200 is formed from a metal plate,

Connector pins to ensure reliable contact.