阅读说明：本技术 电力介面 (Power interface ) 是由 金正培 琴旻钟 尹永太 李景国 于 2019-02-07 设计创作，主要内容包括：本发明是关于一种电力介面,尤其是关于用于电连接待侧物和测试驱动单元的电力介面。根据示例实施例的电力介面包含：支撑件、弹性件、第一连接端部、第二连接端部以及弹性片。弹性件固定到支撑件并提供垂直方向的弹力。第一连接端部设置于弹性件。第二连接端部电连接到第一连接端部。弹性片的一端固定到弹性件且弹性片的另一端固定到支撑件以限制弹性件的变形范围。(The present invention relates to an electrical interface, and more particularly to an electrical interface for electrically connecting a test object to a test driver unit. A power interface according to an example embodiment includes: support piece, elastic component, first connection end, second connection end and flexure strip. The elastic member is fixed to the support member and provides elastic force in a vertical direction. The first connecting end is arranged on the elastic piece. The second connection end portion is electrically connected to the first connection end portion. One end of the elastic piece is fixed to the elastic member and the other end of the elastic piece is fixed to the support member to limit the deformation range of the elastic member.)

1. A power interface, comprising:

a support member;

an elastic member fixed to the support member and used to provide an elastic force in a vertical direction;

the first connecting end part is arranged on the elastic piece;

the second connecting end part is electrically connected with the first connecting end part; and

an elastic piece, one end of which is fixed to the elastic member and the other end of which is fixed to the support member to limit the deformation range of the elastic member,

wherein the elastic piece is provided so as not to be in contact with the elastic member and the support member in the remaining regions except for the regions fixed to the elastic member and the support member, respectively.

2. The electrical interface of claim 1, wherein the first connection end is disposed on the elastic member to move freely according to the deformation of the elastic member.

3. The electrical interface of claim 1, wherein the spring has a length and a width sized to stand upright on the support member.

4. The electrical interface of claim 1, wherein the resilient tab deforms in response to movement of the first connection end.

5. The electrical power interface as recited in claim 1 wherein said first connection end and said second connection end are formed in the shape of pads having a predetermined contact area on said flexible sheet.

6. The power interface of claim 1, wherein the support member includes a stepped portion formed such that a position where the elastic piece is fixed is higher than a position where the elastic piece is fixed.

7. The power interface of claim 1, wherein the resilient piece is formed to be bent downward from an outer side of an upper end of the resilient piece.

8. The electrical interface of claim 1, wherein the number of the resilient member, the first connecting end and the second connecting end is plural,

the first connection ends are respectively arranged on the elastic pieces, and

the plurality of second connecting end portions are respectively and electrically connected to the plurality of first connecting end portions.

9. The power interface of claim 8, wherein the resilient tab includes a cut-out portion formed by removing at least a portion of an area between the first plurality of connection ends.

10. The electrical interface of claim 9, further comprising a flexible connection tab for interconnecting the first connection ends to limit the range of movement of the first connection ends.

11. The electrical interface of claim 10, wherein the resilient connecting tabs have a length greater than a length between the first plurality of connection ends.

12. The power interface of claim 8, further comprising a printed circuit board secured to the support and configured to apply a test current to each of the plurality of second connection ends.

Technical Field

The present invention relates to a power interface (or power interface), and more particularly, to a power interface for electrically connecting an object to be tested and a test driving unit.

Background

The light emitting element is a device serving as a light source, and transmits or receives a signal by using a compound semiconductor characteristic (compound semiconductor characteristics), thereby converting an electrical signal into an infrared beam or infrared light.

Light emitting devices have been used in a variety of products, including thin film transistor liquid crystal displays (TFT-LCDs), Plasma Display Panels (PDPs), and Organic Light Emitting Diodes (OLEDs). The light emitting device is manufactured by repeatedly performing processes such as photo (photo), diffusion (diffusion), deposition (deposition), etching (etching), ion implantation (ion implantation), and the like.

Generally, a burn-in process (aging process) for reliability test is performed in the process of manufacturing a light emitting element to check in advance whether the light emitting element is properly driven.

The burn-in process includes a basic particle inspection, and checks whether the light emitting element is normally operated by applying an electrical signal for a predetermined time in a state where the light emitting element is transferred and placed in a burn-in chamber (aging chamber).

In order to check whether the light emitting device is operating normally, a power interface is required to electrically connect the light emitting device as a test object with the test driving unit. In the prior art, a spring probe (pogo pin) is commonly used as the power interface, and has a profile such that the pin is mounted to the body containing the spring.

However, since the spring probe for detecting the light emitting element in the prior art moves along with the spring in the body, the body and the needle are in surface contact with each other. The frictional force caused by the surface contact causes the particles to be continuously generated. Therefore, the detection time and the probability of contact failure of the manufactured light emitting device are increased, and the extra step for removing the particles requires a lot of time, thereby reducing the yield (yield).

[ related art document ]

Patent document 1: KR10-2005-0017759A

Disclosure of Invention

Technical problem

The invention provides an electrical interface, which can electrically connect an object to be tested and a test driving unit and elastically support the object to be tested.

Means for solving the problems

According to an exemplary embodiment, a power interface comprises: support piece, elastic component, first connection end, second connection end and flexure strip. The elastic piece is fixed on the support piece and used for providing elastic force in the vertical direction; the first connecting end is arranged on the elastic piece; the second connecting end part is electrically connected with the first connecting end part; one end of the elastic piece is fixed on the elastic piece and the other end of the elastic piece is fixed on the supporting piece to limit the deformation range of the elastic piece. Here, the elastic piece is not in contact with the elastic member or the support member except for the region where it is fixed to each of the elastic member and the support member.

The first connection end may be provided to the elastic member to freely move according to deformation of the elastic member.

The resilient member may have a length and a width determined by the principle of standing on the support member.

The elastic piece may be deformed according to the movement of the first connection end portion.

The first connection end and the second connection end may each have a pad-like shape having a predetermined contact area, and the first connection end and the second connection end are each disposed on the elastic sheet.

The support member may include a stepped portion such that the position of the fixed elastic piece is higher than the position of the fixed elastic piece.

The elastic piece may be bent downward from an outer side of an upper end of the elastic member.

The number of the elastic pieces, the number of the first connecting end portions and the number of the second connecting end portions can be respectively multiple, the multiple first connecting end portions are respectively arranged on the multiple elastic pieces, and the multiple second connecting end portions can be respectively and electrically connected to the multiple first connecting end portions.

The elastic sheet may include a cut-out portion defined by an area where at least a portion between the plurality of first connection end portions is removed.

The power interface may further include a flexible connection piece for interconnecting the plurality of first connection ends so as to limit a movement range of each of the plurality of first connection ends.

The length of the elastic connecting piece may be greater than the length between the plurality of first connection ends.

The power interface may further include a printed circuit board secured to the support and configured to apply a test current to each of the plurality of second connection ends.

Advantageous effects

According to the power interface of an exemplary embodiment, since the connection terminal electrically connected to the object to be tested can move freely with the elastic member and the elastic sheet, it is possible to prevent a frictional force caused by the movement of the connection terminal and prevent particles generated due to the frictional force.

In addition, since the object to be tested and the test driving unit are electrically connected by the conductive pattern disposed on the elastic sheet, an electrical connection path can be minimized, and since the elastic sheet is provided with the connection end portion to increase an electrical contact area between the object to be tested and the test driving unit, an internal resistance according to an applied test current can be effectively reduced.

Drawings

Fig. 1 is a view illustrating the appearance of a general commonly used spring probe (pogo pin).

FIG. 2 is a diagram illustrating the appearance of a power interface, according to an exemplary embodiment.

FIG. 3 illustrates a state of operation of a power interface according to an exemplary embodiment.

Fig. 4 is a perspective view illustrating an appearance of a power interface according to another exemplary embodiment.

Detailed Description

Hereinafter, example embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Also, for convenience, spatially relative terms, such as "above" or "upper" and "below" or "lower", may be used herein to describe one element or feature as illustrated in the figures relative to another element or feature. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. Here, like reference numerals denote like elements.

Fig. 1 is a view illustrating the appearance of a general commonly used spring probe (pogo pin). Here, part (a) in fig. 1 is a view showing the spring 30 in an expanded state, and part (b) in fig. 1 is a view showing the spring 30 in a compressed state.

Referring to fig. 1, a commonly used spring probe includes: barrel 10, contact tip 20, spring 30, and plunger 40. The barrel portion 10 serves as a main body and has a hollow structure; the contact end portion 20 is provided at the upper end of the barrel portion 10; a spring 30 is attached to the contact end 20 in the tube portion 10 to provide elastic force for compression and extension; a plunger 40 is connected to the end of the spring 30 opposite the contact end 20 for piston movement.

The spring probe performs an electrical function test by electrically connecting an object to be tested, such as a connection terminal of a light emitting device, to a test driving unit, and absorbs a mechanical impact generated by the plunger 40 and the contact end 20 by compression and extension of the spring 30.

However, when the contact tip 20 and the plunger 40 are vertically moved by the compression and extension of the spring 30, the above-described spring probe surface contacts the inside of the cylinder 10. Due to the above-described surface contact between the contact tip 20, the plunger 40, and the cylinder 10, the contact tip 20, the plunger 40, and the cylinder 10 are worn, and as the contact tip 20, the plunger 40, and the cylinder 10 are worn, particles are continuously generated from the spring probe.

Therefore, since the probability of contact failure and short circuit of the manufactured light emitting device is increased, the time required for the electrical function test of the light emitting device in the burn-in process including the basic particle detection is increased, and the time required for the additional process for removing the particles is also increased, so that the manufacturing yield of the light emitting device is significantly reduced.

Therefore, the power interface according to the exemplary embodiment provides a technical feature of preventing the elastic movement from causing the surface contact friction force and minimizing the generation of particles when the object to be tested is elastically supported and electrically connected to the test driving unit.

Fig. 2 is a view illustrating an appearance of a power interface according to an exemplary embodiment, and fig. 3 is a view illustrating a state in which the power interface operates according to an exemplary embodiment. Here, part (a) in fig. 3 is a view showing the elastic member 200 in an extended state, and part (b) in fig. 3 is a view showing the elastic member 200 in a compressed state.

Referring to fig. 2 and 3, a power interface according to an exemplary embodiment includes: the support member 100, the elastic member 200, the first connection end portion 310, the second connection end portion 320, and the elastic sheet 300. The elastic member 200 is fixed to the supporting member 100 to provide elastic force in a vertical direction; the first connection end portion 310 is disposed at the elastic member 200; the second connection end 320 is electrically connected to the first connection end 310; one side of the elastic piece 300 is fixed to the elastic member 200 and the other side of the elastic piece 300 is fixed to the supporting member 100 to limit the deformation range of the elastic member 200.

The supporting member 100 is disposed at the bottom for fixing respective partial regions of the elastic member 200 and the elastic sheet 300. The supporting member 100 may have a flat plate shape extending in one direction, and the elastic member 200 is fixed to the top surface of the supporting member 100. Here, the supporting member 100 for fixing the respective partial regions of the elastic member 200 and the elastic sheet 300 may be made of a non-conductive synthetic resin material, such as plastic.

The elastic member 200 has a lower end fixed to the support member 100 and the elastic member 200 stands upward to provide elastic force in a vertical direction. As described later, the first connection end 310 may be provided to the elastic member 200 to freely move according to the deformation of the elastic member 200. Accordingly, since the elastic member 200 supports the first connection end 310 and vertically moves the first connection end 310 via compression and tension, the length and width of the elastic member 200 are determined such that the elastic member 200 stands on the support member 100. That is, since the elastic member 200 stands on the support member 100 without being deviated to the side edge when the length of the elastic member 200 is decreased and the width is increased, the length and the width of the elastic member 200 may be determined to have the maximum decreased length and the maximum increased width within a range of providing the elastic force to the first connection end 310.

The elastic member 200 may include various members that do not come into surface contact when elastic force is provided upward. Although a spring is exemplarily illustrated as the elastic member 200 in the drawings, the exemplary embodiment is not limited thereto. For example, the elastic member 200 may include various bent or curved members to provide elastic force upward through compression or extension.

Here, the lower end of the elastic member 200 is fixed to the upper surface of the support member 100, and the upper end of the elastic member 200 is fixed to the lower surface of the elastic sheet 300. Here, the first fixing member 210 may be installed between the lower end of the elastic member 200 and the upper surface of the support member 100 for simply combining the elastic member 200 to the upper surface of the support member 100. The first fixing member 210 may have a convex shape for insertion-coupling (insertion-coupling) the elastic member 200, or a shape providing a contact surface corresponding to the upper surface of the support member 100. In addition, the second fixing member 220 may be installed between the upper end of the elastic piece 200 and the lower surface of the elastic sheet 300, and the second fixing member 220 serves to support the elastic sheet 300 such that the elastic sheet 300 is flat. The first and second fixing members 210 and 220 may be integrally formed with or attached (attached) to the support 100 or the elastic sheet 300.

The first connection end 310 may be disposed on the elastic member 200, and the second connection end 320 may be electrically connected to the first connection end 310. Here, the first connection end 310 may be provided at one side of the upper surface of the elastic sheet 300 to freely move according to the deformation of the elastic member 200, wherein the one side of the upper surface of the elastic sheet 300 extends onto the elastic member 200. Here, the free movement according to the deformation of the elastic member 200 means a structure that is not directly supported by an independent structure that controls the moving direction in addition to the deformation of the elastic member 200. As described above, when the first connection end portion 310 is provided to the elastic member 200 to freely move according to the deformation of the elastic member 200, a frictional force may not be caused by the movement of the first connection end portion 310, and thus particles may not be generated.

In addition, the second connection end 320 is electrically connected to the first connection end 310. Here, the second connection end 320 may be disposed at the other side of the upper surface of the elastic sheet 300, wherein the other side is fixed to the supporter 100, and the second connection end 320 may be electrically connected to the first connection end 310 through a conductive pattern (conductive pattern) disposed at the upper surface or the inner side of the elastic sheet 300.

Here, the first connecting end 310, the second connecting end 320 and the elastic sheet 300 may be regarded as a Flexible Printed Circuit Board (FPCB), and the FPCB includes a circuit pattern electrically connecting the first connecting end 310 and the second connecting end 320. That is, the first connection end portion 310, the second connection end portion 320 and the elastic sheet 300 may be used as a flexible printed circuit having elasticity, and the conductive pattern made of copper foil in the flexible printed circuit is disposed on the flexible film.

As described above, since the first connection terminal 310 and the second connection terminal 320 electrically connected to the first connection terminal 310 are disposed on the flexible sheet 300 to electrically connect the object to be tested 50 and the test driving unit on the flexible sheet 300, the power interface according to the exemplary embodiment can minimize the internal resistance. That is, as described above, when the spring probe is used as the power interface, the barrel 10 and the spring 30 between the contact tip 20 and the plunger 40 provide a path for electrically connecting the object 50 to be tested and the test driving unit. On the other hand, since the object to be tested 50 and the test driving unit are electrically connected through the first connection end 310 and the second connection end 320 provided on the elastic sheet 300, rather than electrically connecting the object to be tested 50 and the test driving unit through the cylinder 10 and the spring 30, the power interface according to the exemplary embodiment can minimize an electrical connection path and effectively reduce internal resistance.

In order to increase contact property, each of the first and second connection end portions 310 and 320 may have a pad shape provided with a predetermined contact area. That is, the first connection terminal 310 may have a pad shape to increase a contact property with the connection terminal 55 of the object 50 to be tested, and the second connection terminal 320 may have a pad shape to increase a contact property with the printed circuit board of the test driving unit for detecting the power characteristics of the object 50 to be tested. Although not shown, when a plurality of protrusions are provided on the upper surfaces of the first connection terminal 310 and the second connection terminal 320, respectively, the contact property between the object to be tested 50 and the test driving unit may be further increased.

One side of the elastic piece 300 is fixed to the elastic member 200, and the other side of the elastic piece 300 is fixed to the support member 100 to limit the deformation range of the elastic member 200. That is, one side of the elastic piece 300 is fixed to the upper end of the elastic member 200, and the other side of the elastic piece 300 is fixed to the supporter 100. Here, due to the movement of the first connection end 310 caused by the compression and the extension of the elastic member 200 and the movement of the first connection end 310 caused by the deformation of the elastic member 200 in the one side upward, the elastic sheet 300 is deformed according to the movement of the first connection end 310 while limiting the deformation range of the elastic member 200. The elastic sheet 300 may be formed in a film shape and have a property of being elastically deformed when external pressure is applied. The elastic sheet 300 may be made of various elastic synthetic resin materials, such as polypropylene (polypropylene) and polyethylene (polyethylene).

Here, since one side of the elastic piece 300 is fixed to the upper end of the elastic member 200 and the other side of the elastic piece 300 is fixed to the support member 100, the elastic piece 300 does not contact the elastic member 200 or the support member 100 except for regions respectively fixed to the upper end of the elastic member 200 and the support member 100. One side of the elastic piece 300 may be fixed to the upper end of the elastic member 200 and the other side of the elastic piece 300 may be fixed to the support member 100, or, although not shown, both ends of the elastic piece 300 may be fixed to the support member 100 and a partial region between both ends may be fixed to the upper end of the elastic member 200. Further, the elastic piece 300 may be provided in various ways within a range that limits the deformation range of the elastic member 200. For example, one end of the elastic piece 300 may be fixed to the upper end of the elastic member 200, and the other end of the elastic piece 300 may be fixed to the support member 100 at the lower end of the elastic member 200.

In addition, a partial region of the elastic sheet 300 may be fixed to the upper surface of the support member 100. That is, in the supporting member 100, a region where the elastic member 200 is fixed is referred to as a first region, and a region where the elastic sheet 300 is fixed is referred to as a second region, wherein the first region and the second region may be respectively disposed on the upper surface of the supporting member 100. In this case, when the region fixed to the elastic member 200 and the region fixed to the support member 100 are disposed in a lateral direction, the elastic sheet 300 may not contact the elastic member 200 even if the elastic member 200 is compressed or stretched.

Here, the elastic sheet 300 serves to limit deformation or lateral deviation of the elastic member 200 within a range in which the elastic member 200 can be compressed or stretched. Therefore, the supporter 100 may include the stepped portion 110, and the stepped portion 110 serves to make the second region of the fixed elastic piece 300 higher than the first region of the fixed elastic piece 200. The step 110 may protrude from the support 100. Compared to the second region and the first region being disposed on the same plane, when the support 100 is disposed with the step portion 110 to make the second region higher than the first region, the length of the elastic sheet 300 extending between the elastic member 200 and the support 100 is reduced, so that the lateral deformation or deviation of the elastic member 200 can be more easily limited.

That is, in the case of fig. 2, when the elastic member 200 is inclined to the left, the elastic sheet 300 provides a tensile force to prevent the elastic member 200 from being deformed or deviated. Although not shown, in the case where both ends of the elastic piece 300 are fixed to the support member 100 and a partial region between both ends of the elastic piece 300 is fixed to the upper end of the elastic member 200, when the elastic member 200 is inclined to the left or right, the elastic piece 300 may provide a tensile force to prevent the elastic member 200 from being deformed or deviated. In addition, since the elastic sheet 300 has a predetermined width, the elastic sheet 300 can provide a tensile force even when the elastic member 200 is inclined forward or backward. In this case, although the elastic sheet 300 may not completely prevent the deformation of the elastic member 200 in the lateral direction, the elastic sheet 300 may simplify the configuration and reduce the manufacturing cost by limiting the deformation range of the elastic member 200 within a predetermined range when applied to a light emitting element having a relatively large width and pitch of the connection end portion 55 of the object 50 to be measured in terms of more severe limitation caused by the generation of particles.

In addition, the elastic piece 300 may be bent downward from an outer side of an upper end of the elastic member 200. That is, since the first connection end portion 310 is disposed at the upper end of the elastic member 200 and is exposed upward, only the first connection end portion 310 is exposed upward, and the conductive pattern electrically connecting the first connection end portion 310 and the second connection end portion 320 is slightly exposed upward, the elastic sheet 300 may be bent downward from the outer side of the upper end of the elastic member 200 (i.e., the outer side of the first connection end portion 310), so that the connection end portion 55 of the object 50 is connected to the first connection end portion 310.

As described above, the structure of the power interface according to the exemplary embodiment may have the following features: the first connection end portion 310 provided to the elastic sheet 300 eliminates the surface-to-surface contact in the vertical motion according to the compression or extension of the elastic member 200.

That is, when the clamp Z on the supporting member 100 presses the object 50, the first connecting end 310 moves vertically by the elastic force of the elastic member 200 disposed under the elastic sheet 300, but the moving range is limited by the elastic sheet 300. Accordingly, when the first connection end 310 is moved by the elastic force of the elastic member 200, particles generated by friction can be prevented.

Further, a plurality of power interfaces according to the exemplary embodiments as described above may be provided, and the power interfaces may be disposed adjacent to each other. That is, the electrical interfaces may be spaced apart by a predetermined distance for electrically connecting to the connecting ends 55 of the object 50. In this case, each power interface may be inserted into a separate structure in which a recess is defined through which the support 100 is fixedly inserted. In addition, the power interface having a partially integrated structure may be electrically connected to the connection ends 55 of the dut 50, respectively, and the power interface according to another exemplary embodiment will be described in detail below.

FIG. 4 is a perspective view illustrating the appearance of a power interface according to another exemplary embodiment.

Referring to fig. 4, a power interface according to another exemplary embodiment is different from the power interface according to an exemplary embodiment in that the number of each elastic member 200, the first connection end 310 and the second connection end 320 is plural, the first connection ends 312, 314 and 316 are respectively disposed on the elastic members 200, and the second connection ends 322, 324 and 326 are electrically connected to the first connection ends 312, 314 and 316.

That is, the power interface according to another exemplary embodiment is different from the above-described power interface according to an exemplary embodiment in that it includes the support member 100 and the elastic piece 300 which are integrally formed. Since the above-described features of the power interface according to an exemplary embodiment may be directly employed except for the support member 100 and the elastic sheet 300 which are integrally formed, a repetitive description will be omitted.

The supporting member 100 is disposed at the bottom to fix a partial area of each elastic piece 300 so as to fix the upper end of each elastic member 200 to the elastic members 200. The supporting member 100 may have a flat plate shape, and extends in each of one direction for fixing a partial region of the elastic sheet 300 and the other direction in which the elastic members 200 are arranged. Here, the region where these elastic members 200 are fixed is referred to as a first region; the region of the fixed elastic sheet 300 is referred to as a second region; the first region may extend in a direction in which the elastic members 200 are arranged, and the second region may extend in a direction in which the second connection end portions 320 are arranged. In addition, as described above, the support member 100 may be made of a non-conductive synthetic resin material, such as plastic.

Here, the plurality of elastic members 200 are each fixed to a first region, and the elastic sheet 300 is fixed to a second region, each of which may be disposed on the upper surface of the support member 100. In addition, the support 100 may include a step portion 110 such that the second region is disposed higher than the first region. As described above, since the first region and the second region are each disposed on the upper surface of the supporting member 100, the region where the elastic members 200 are fixed and the region where the elastic sheet 300 is fixed may be arranged in the lateral direction. Therefore, even when the respective elastic members 200 are compressed or stretched, the elastic sheet 300 may not be in contact with the elastic members 200; by setting the second region higher than the first region, the length of the elastic sheet 300 may be reduced, and the deviation of the respective elastic members 200 in the lateral direction may be more easily restricted.

The elastic members 200 each have a lower end fixed to the support member 100, and the lower end provides an elastic force upward. Although a spring is preferred as the elastic member 200, and the spring does not have a surface-to-surface (surface-to-surface) structure when compressed or extended, the elastic member 200 may include various members that are bent or curved to provide an elastic force upward by compression or extension. In addition, although the lower ends of the respective elastic members 200 are fixed to the support member 100 because the elastic members 200 are arranged in one direction in fig. 4, the respective elastic members 200 may be arranged and fixed in different manners according to the arrangement of the connection ends of the test object.

The elastic pieces 300 are extended to be fixed to the upper ends of the respective elastic members 200 and fixed to the support member 100; the first connection end portions 312, 314, 316 are disposed at the upper end of each elastic member 200 and are exposed upward; the second connecting ends 322, 324, 326 are electrically connected to the first connecting ends 312, 314, 316, respectively, and the second connecting ends 322, 324, 326 are disposed on the upper surface of the elastic sheet 300.

That is, the elastic sheet 300 has a region integrally formed with the upper end of each elastic member 200 and another region fixed to the support member 100, and the remaining region of the elastic sheet 300 is spaced apart from the elastic members 200 and the support member 100 except the region where the upper ends of the respective elastic members 200 and the support member 100 are fixed. Here, the elastic sheet 300 serves to restrict the lateral deviation of the elastic member 200 within a range in which the elastic member 200 can be compressed or stretched. The elastic sheet 300 has a film-like outer shape and is elastically bendable when an external pressure is applied thereto, and the first connection end portions 312, 314, 316 and the second connection end portions 322, 324, 326 exposed on the elastic sheet 300 are electrically connected by conductive patterns 332, 334, 336, respectively. Here, as shown in the drawings, the first connection ends 312, 314, 316 may be electrically connected to the second connection ends 322, 324, 326 in a one-to-one corresponding manner. Alternatively, conductive patterns may be used to electrically connect the first connection ends 312, 314, 316 to a second connection end. In addition, as described above, the flexible printed circuit board can be used to simply dispose the first connection ends 312, 314, 316, the second connection ends 322, 324, 326, and the conductive patterns 332, 334, 336 on the elastic sheet 300.

Here, when the first connection ends are disposed at the upper ends of the respective elastic members 200, since the elastic sheet 300 is integrally formed with the upper ends of the respective elastic members 200, when the first connection ends each vertically move according to compression or tension of the elastic member 200 disposed below the first connection ends, the respective first connection ends are restricted by the other first connection ends. Accordingly, the elastic sheet 300 may comprise a plurality of cut-outs 350, wherein the cut-outs 350 are defined by removing at least a portion of the area between the first connection ends 312, 314, 316. Here, each of the cut-outs 350 may be formed by partially removing portions of the elastic sheet 300 located between the plurality of first coupling ends adjacent thereto, and thus vertically move individually according to the compression and tension of each of the elastic members 200, wherein each of the elastic members 200 is disposed under the first coupling ends 312, 314, 316, respectively.

In addition, the cut-outs 350 may extend downward from the upper end of each elastic member 200. That is, the cut-outs 350 may be formed by removing an area of the resilient sheet 300 that extends downwardly from at least a portion of the area between the first connection ends 312, 314, 316. Here, the elastic sheet 300 may be bent downward from the upper end of each elastic member 200 (i.e., the outer side of the first connection end portions 312, 314, 316). In this case, even when the first connection end portions 312, 314, 316 are not arranged in one direction, the elastic sheet 300 may be bent downward from the upper portion of each elastic member 200 because the cut-away portions 350 extend downward from the upper portion of each elastic member 200.

In addition, the power interface according to an exemplary embodiment may further include an elastic connection piece 400, wherein the elastic connection piece 400 connects the first connection ends 310 to each other. That is, when at least a partial region between the first connection ends 312, 314, 316 of the elastic sheet 300 is removed by the cut-outs 350, the elastic connection sheet 400 connects the first connection ends 312, 314, 316 to each other in the partially removed region. Here, the elastic connection piece 400 serves to limit the moving range of the first connection end, i.e., when each elastic member 200 is inclined in a lateral direction, the elastic connection piece 400 serves to prevent each first connection end from moving in the lateral direction. In this case, the length of the elastic connecting piece 400 may be greater than the length between the first connection end portions 312, 314, 316. In this case, the elastic connecting piece 400 may be bent downward between the first connection end portions 312, 314, 316. That is, when the length of the elastic connecting piece 400 is the same as the length between the first connection end portions 312, 314, 316, the length of the elastic connecting piece 400 may be the same as the length when the cut-away portion 350 is not provided between the first connection end portions 312, 314, 316. In this case, the first connection end portion may be restricted from moving alone. However, when the length of the elastic connecting piece 400 is greater than the length between the first connecting ends 312, 314, 316, each of the first connecting ends can move alone without affecting the other first connecting end, and the lateral movement of the first connecting end within a predetermined range is limited by adjusting the length of the elastic connecting piece 400. As described above, since the partial region where the elastic piece 300 is fixed is laterally spaced apart from the elastic member 200 and the partial region of the cut-away portion 350 defined between the first connection ends 312, 314, 316 is connected by the elastic connection piece 400, the power interface according to the exemplary embodiment can restrict the movement of each first connection end in forward and backward directions as well as in both lateral directions, to prevent each first connection end from being twisted or deviated.

In addition, the power interface according to another exemplary embodiment may further include a printed circuit board (not shown), wherein the printed circuit board includes a circuit pattern for applying a test current to each of the second connection ends 322, 324, 326 provided on the elastic sheet 300. Here, the printed circuit board may be used to apply a test current from the test driving unit to the second connection ends 322, 324, 326, and the printed circuit board may be fixed to the support 100 such that a circuit pattern of the printed circuit board is electrically connected to the second connection ends 322, 324, 326 of the elastic sheet 300 on the support 100. The printed circuit board may be coupled and fixed to the support 100 by a bolt or the like (manifold), and since the printed circuit board is directly fixed and coupled to the support 100, the printed circuit board may be securely coupled to the second connection end portions 322, 324, 326 while maintaining electrical connection with the second connection end portions 322, 324, 326.

As described above, since the connection terminal electrically connected to the object to be tested can freely move along with the elastic member 200 and the elastic sheet 300, the power interface according to the exemplary embodiment can prevent a frictional force caused by the movement of the connection terminal and prevent particles generated due to the frictional force.

In addition, since the object to be tested and the test driving unit are electrically connected by the conductive pattern disposed on the elastic sheet 300, an electrical connection path can be minimized, and since the elastic sheet 300 is provided with a connection end portion to increase an electrical contact area between the object to be tested and the test driving unit, an internal resistance according to an applied test current can be effectively reduced.

Although specific embodiments have been described with reference to the accompanying drawings, it is not limited thereto. Accordingly, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.