KR20200112500A - Electric contact terminal capable for surface mounting with low compressive force - Google Patents

Abstract

Disclosed is an electrical contact terminal, which has a high height compared to a width, which can be surface mounted and has a small compressive load. A core consists of a single body and has a dimension with a height which is higher than the width, and a soldering part is formed on the lower surface of the core wherein the forks are opened to both sides from the core to be extended therefrom. The upper surface of the core located between the forks forms a flat surface to form a pickup area, and the fork is bent while being opened in direct contact with the electrically conductive object. The present invention has a structure which facilitates surface mounting by vacuum pickup.

Description

Electric contact terminal capable for surface mounting with low compressive force}

The present invention relates to an electrical contact terminal having elasticity, and in particular, to an electrical contact terminal having a height compared to its width, capable of soldering by surface mounting, and having a small compressive load.

As an electrical contact terminal capable of reflow soldering, an elastic electrical contact terminal in which a solderable metal layer is formed on a heat-resistant rubber core having elasticity of a rubber material is applied to various electric devices.

For example, an elastic electrical contact terminal may be used for electrical connection between an electrically conductive object such as a metal case and a printed circuit board.

Domestic Patent Nos. 1001354, 1735656, and 993253 by the present applicant have disclosed such solderable electrical contact terminals.

However, when electrically connecting a printed circuit board with an electrically conductive object of low mechanical strength such as an LCD panel instead of the above metal case, it is necessary not to apply a lot of force to the LCD panel by the electrical contact terminal. In the case of applying the electrical contact terminal proposed in the patent, there is a problem that these requirements are not completely satisfied.

For example, when a force is applied to the LCD panel and the LCD panel mechanically and electrically elastically contacts the electrical contact terminal soldered to the circuit board, all or part of the contact surface of the electrical contact terminal contacts one surface of the LCD panel. Since the applied force is concentrated on one part of the LCD panel, there is a disadvantage that it is difficult for the LCD panel to operate normally because bending or bending occurs in the LCD panel with low mechanical strength.

Accordingly, an object of the present invention is an electrical contact terminal capable of soldering by surface mounting with a low compressive force of a structure in which the compressive load caused by an object to which an external force is applied is distributed or reduced, and as a result, the force applied to the object is distributed or reduced. Is to provide.

Another object of the present invention is to provide an electrical contact terminal capable of soldering by surface mounting with a low compression force having a structure in which surface mounting by vacuum pickup is easy.

Another object of the present invention is to provide an electrical contact terminal capable of reliably mechanically and electrically contacting an opposing object and capable of soldering by surface mounting of a low compression force having good resilience.

Another object of the present invention is to provide an electrical contact terminal capable of soldering by surface mounting with low compression force, which is inexpensive in material cost and easy to manufacture.

The above object is a solderable elastic electrical contact terminal comprising an elastic core, a heat-resistant polymer film bonded to surround the core and formed with a solderable metal layer on the outer surface, and an adhesive interposed between the core and the polymer film. , The core is made of a single body, and fork portions wider than the width of the lower surface are formed to extend from the lower surface of the core to both sides in the height direction, and on the upper surface of the core located between the fork portions A vacuum pickup region is formed, the lower surface of the core is covered with the polymer film, the end of the polymer film is spaced between the fork portions, and the upper end of the fork portion is in contact with the electrically conductive object and is applied to the object by a force It is achieved by an electrical contact terminal capable of soldering by surface mounting of low compression force, characterized in that it spreads outward.

Preferably, the fork portion is opened in a V-shape, and the thickness of the fork portion is formed to be narrower toward the end.

Preferably, the polymer film is removed to a certain height part around the vacuum pickup area of the core to form an exposed part, and the height of the exposed part is the core when the fork part is widened by a force applied to the object. It may be a height that does not contact the object.

Preferably, the fork portion is bent so that the end of the fork portion is further spread outward, and the fork portion and the polymer film may be symmetrical left and right around the vacuum pickup area.

Preferably, the height of the electrical contact terminal is larger than the width of the lower surface of the core, and may be, for example, twice or more in size.

Preferably, the electrical contact terminal may be reel taped to the carrier.

According to the above configuration, since the metal layer formed on the two fork portions branching from and extending from the core contacts two portions of the opposite electrically conductive object and then slides and bends by the force applied, the compressive force applied to the object It is dispersed and becomes smaller.

In addition, the expensive polymer film is saved as much as the exposed part of the core, reducing the manufacturing cost, and the V-shaped core makes it easy to adhere the film on the core, and it is easy to move the pickup nozzle during vacuum pickup. When force is applied, since there is no polymer film on the exposed portion of the core, the fork portion is easy to bend or slide smoothly.

In addition, since the thickness of the flesh decreases as the fork portion goes to the upper end, the restoring force is good.

1 is a perspective view showing an electrical contact terminal according to an embodiment of the present invention.
2(a) and 2(b) show the operation of the electrical contact terminal, respectively.
3(a) and 3(b) each show an electrical contact terminal according to another embodiment of the present invention.

It should be noted that the technical terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be interpreted as generally understood by those of ordinary skill in the technical field to which the present invention belongs, unless otherwise defined in the present invention, and is excessively comprehensive. It should not be construed as a human meaning or an excessively reduced meaning.

Hereinafter, the electrical contact terminal according to the present invention will be described in detail with reference to the accompanying drawings. Here, the accompanying drawings are for aiding understanding of the present invention, and for convenience of description, some configurations may be shown to be somewhat exaggerated, ignoring dimensions and the like.

1 is a perspective view showing an electrical contact terminal according to an embodiment of the present invention.

The electrical contact terminal 100 is composed of an elastic core 110 and a heat-resistant polymer film 120 bonded to surround the core 110. As shown in the circle of FIG. 1, the outer surface of the polymer film 120, that is, exposed A metal layer 140 capable of soldering is formed on the surface, and the opposite surface is bonded to the core 110 through an adhesive 130.

The electrical contact terminal 100 is supplied by reel taping on a carrier, vacuum picked up, mounted on a circuit board, and mounted by reflow soldering.

Hereinafter, each configuration of the electrical contact terminal 100 will be described in detail.

<Core (110)>

The material of the core 110 may be a non-foaming or foamed heat-resistant elastic rubber having heat resistance and elasticity for reflow soldering, for example, a silicone rubber having heat resistance corresponding to soldering as a material, and has adequate mechanical strength and elasticity. For this, it may have a hardness of 35 to 70 Shore A.

Referring to Figure 1, the core 110 is made of a single body, the height of the core 110 compared to the width of the lower surface of the core 110 is configured in a shape, for example, the width of the lower surface is approximately 6 mm. The height of the electrical contact terminal 100 may be 13 mm.

The width of the lower surface of the core 110 is less than 1/2 of the height of the core 110, and as a result, the electrical contact terminal 100 of the present invention uses a narrow area of the printed circuit board and the distance between the opposite object and the circuit board It is suitable for use in this large area.

As described above, the electrical contact terminal 100 has a structure that provides a small force to an object opposite to the width of the lower surface is less than the height, and is easy to apply.

The vertical cross section of the core 110 is formed in a substantially V-shaped shape that is wide open from the outside and narrowly opened from the inside, and is symmetrical with respect to the vertical center line as a whole.

As described above, since the vertical cross section of the core 100 is substantially V-shaped, it is easy to adhere the polymer film 120 to be described later, and the pickup nozzle can easily enter and exit without external interference during vacuum pickup.

A soldering part 111 is formed on the lower surface of the core 110 and, as described later, is mounted by reflow soldering using a solder cream formed on a conductive pattern of a circuit board.

The lower surface of the core 110 may be inclined toward the middle portion from both ends so that the soldering portions 111 are formed as a pair, but is not limited thereto, and a single soldering portion may be formed by flattening the lower surface of the core 110.

Branching from the core 110 and spreading wider than the width of the lower surface of the core 110 on both sides in the height direction, the fork 112 is extended and formed. As will be described later, the fork 112 is an electrically conductive object It is a part that is in direct contact with the object and slides out or bends by an external force.

The core 110 is integrally formed by a single extrusion process.

The fork part 112 is separated into two, one on the left and right, and the fork part 112 is symmetrical to the left and right around the vacuum pickup area 113 so that the center of gravity is located at the center of the electrical contact terminal 100 as a whole. So that there is no shaking or blurring during reflow soldering.

Since the thickness of the fork part 112 is formed to be narrower toward the end, it may slide more easily at the end to open or bend. The thickness of the fork portion 112 is not particularly limited, but preferably has a thickness of the flesh at which the center of gravity is located at the lower end of the electrical contact terminal 100, so that there is no shaking or blurring during reflow soldering.

A vacuum pickup region 113 is formed on the upper surface of the core 110 located between the fork portions 112, and the electric contact terminal 100 may be vacuum picked up from the pickup region 113 and surface mounted.

Preferably, the vacuum pickup area 113 is planar.

<Adhesive layer 130>

The adhesive layer 130 is positioned between the surface of the core 110 and the polymer film 120 to reliably bond the core 110 and the polymer film 120, and maintains adhesion and elasticity even before and after soldering.

The adhesive layer 130 is composed of rubber having heat resistance, for example, it may be formed by thermally curing liquid silicone rubber, and has adhesion with the polymer film 120, which is an object opposite, while the liquid silicone rubber is cured. It is formed of a rubber adhesive, and once cured, it retains its elasticity and maintains adhesion even when heat is applied again.

<Polymer film (120)>

The polymer film 120 may be a polyimide (PI) film or other heat-resistant polymer film having good heat resistance corresponding to a soldering temperature in which the metal layer 140 capable of soldering is formed on at least one side.

The lower surface of the core 110 is adhered and covered by the adhesive layer 130 with a polymer film 120 so that the metal layer 140 is exposed to the outside, and the metal layer 140 is exposed to the outside between the forks 112 and the polymer film The ends of 120 are adhered and covered by an adhesive layer 130 to be spaced apart.

Referring to FIG. 1, the polymer film 120 is removed up to a predetermined height part around the pickup area 113 of the core 110 to form the exposed part 114.

Here, the meaning that the polymer film 120 is removed means that the polymer film 120 and the metal layer 140 are not formed in this area.

The polymer film 120 may be removed at the same height from each of the fork portions 112 so that the polymer film 120 may be symmetrical left and right around the vacuum pickup area 113.

According to this structure, since the expensive polymer film 120 is saved as much as the exposed portion 114, the manufacturing cost is reduced and manufacturing is easy, and the exposed portion of the core 110 when the fork portion 112 is opened or bent by the object. Since there is no polymer film 120 in 114, the fork portion 112 may be smoothly opened or bent with a small force.

The height of the exposed portion 114 is such that the core 110 does not contact the object when the fork portion 112 is opened or bent by an applied force of the object, so that the electrically conductive object is the polymer film 120 Do not contact the portion of the core 110 without the metal layer 140.

Hereinafter, the operation of the electrical contact terminal 100 of the present invention will be described.

2(a) and 2(b) show the operation of the electrical contact terminal, respectively.

Solder cream applied on the circuit pattern 14 of the circuit board 10 by vacuum pickup of the electrical contact terminal 100 reel taped to the carrier in the pickup area 113 of the electrical contact terminal 100 by a vacuum pickup nozzle (16) Mount on top.

Thereafter, it is put into a reflow oven and a reflow soldering process is performed according to a predetermined temperature condition, and the electrical contact terminal 100 is soldered to the circuit board 10 and mounted as shown in FIG. 2(a).

Preferably, the center of gravity of the electrical contact terminal 100 has the shape of the core 110 so as to be below 1/2 of the height possible so that shaking, distortion, or movement during reflow soldering is small, and accordingly, the polymer film 120 Is formed.

Referring to FIG. 2(b), when an electrically conductive object 50 such as an LCD panel having low mechanical strength in a plane direction descends in a vertical direction and contacts the electrical contact terminal 100, the fork portion 112 is in the lateral direction. It slides and opens or bends.

At this time, as described above, since the fork part 112 is composed of two parts symmetrically left and right, the fork part 112 is easily opened or bent, and the force is applied to be distributed to two places of the object 50. As a result, the compressive load applied to each part is reduced compared to the force concentrated in one place.

At this time, since the fork portion 112 has a narrower flesh thickness toward the end, after the fork portion 112 is reliably opened or bent, the compression recovery rate according to compression in the height direction of the electrical contact terminal 100 is good.

3(a) and 3(b) each show an electrical contact terminal according to another embodiment of the present invention.

Referring to FIG. 3(a), the fork part 112 has a shape that is rounded while its end is further spread outward.

According to this structure, when the object is pressed in contact with the fork portion 112, the end of the fork portion 112 has the advantage of being reliably wide open because the end of the fork portion 112 is open to some extent.

As such, it is preferable that the shape of both ends of the fork part 112 has a structure in which the fog part 112 slides well in the left-right direction, or is well-opened or bent under the force in the vertical direction provided by the opposite object.

Referring to FIG. 3(b), the polymer film 121 may cover the core 110 by leaving a part of the vacuum pickup area 113, and the lower surface of the core 120 is formed to be flat to form a soldering part 111a. ) Can be formed into one.

Although the above has been described with reference to the embodiments of the present invention, various changes or modifications may be made at the level of those skilled in the art. Such changes and modifications can be said to belong to the present invention as long as they do not depart from the scope of the present invention. The scope of the present invention should be determined by the claims set forth below.

100: electrical contact terminal
110: core
111: soldering part
112: fork portion
113: pickup area
114: exposed portion
120: polymer film
130: adhesive
140: metal layer

Claims (11)

As a solderable elastic electrical contact terminal comprising an elastic core, a heat-resistant polymer film bonded to surround the core and having a solderable metal layer formed on an outer surface thereof, and an adhesive interposed between the core and the polymer film,
The core is made of a single body,
Fork portions wider than the width of the lower surface are extended from the lower surface of the core to both sides in the height direction, and a vacuum pickup region is formed on the upper surface of the core located between the fork portions,
The lower surface of the core is covered with the polymer film, and the ends of the polymer film are spaced between the fork portions,
An electrical contact terminal capable of soldering by surface mounting with a low compression force, characterized in that the upper end of the fork portion is in contact with an electrically conductive object and opens outward by a force applied to the object. In claim 1,
The electrical contact terminal capable of soldering by surface mounting with low compression force, characterized in that the fork portion is opened in a V-shape. In claim 1,
The electrical contact terminal capable of soldering by surface mounting with low compressive force, characterized in that the fork portion has a narrower thickness toward an end thereof. In claim 1,
An electrical contact terminal capable of soldering by surface mounting with a low compressive force, characterized in that the polymer film is removed to a certain height portion around the vacuum pickup area of the core to form an exposed portion. In claim 4,
The height of the exposed portion is a height that prevents the core from contacting the object when the fork portion is opened by a force applied to the object. The electrical contact terminal capable of soldering by surface mounting with low compressive force, characterized in that. In claim 1,
An electrical contact terminal capable of soldering by surface mounting with low compression force, characterized in that the fork portion is bent so that the end of the fork portion is further widened outward. In claim 1,
The fork portion is an electrical contact terminal capable of soldering by surface mounting with low compressive force, characterized in that the fork portion is symmetrical left and right around the vacuum pickup area. In claim 1,
The heat-resistant polymer film is an electrical contact terminal capable of soldering by surface mounting with a low compressive force, characterized in that the heat-resistant polymer film is symmetrical with respect to the vacuum pickup area. In claim 1,
The electrical contact terminal capable of soldering by surface mounting with low compression force, characterized in that the height of the electrical contact terminal is larger than the width of the lower surface of the core. In claim 9,
The electrical contact terminal capable of soldering by surface mounting with low compression force, characterized in that the height of the electrical contact terminal is at least twice the width of the lower surface of the core. In claim 1,
The electrical contact terminal is an electrical contact terminal capable of soldering by surface mounting with a low compressive force, characterized in that the electrical contact terminal is reel taped on a carrier.

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