Test socket

A test socket is provided. According to an aspect of the present invention, provided is a test socket energizably connected to a semiconductor device to electrically test the semiconductor device, the test socket including a base on which a seating part on which the semiconductor device is seated is formed and a test pin protruding from the seating part in one direction, the test pin contactable with a conductive part of the semiconductor device; a cover capable of reciprocating a first position located at an end of the base in one direction and a second position located apart from the first position in the one direction; and a support member coupled to the base and supporting an outer surface of the cover.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0081998, filed on Jul. 4, 2022, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a test socket, and more particularly, to a test socket for fixing a semiconductor device to electrically test a circuit formed in the semiconductor device.

BACKGROUND

In general, a semiconductor device manufactured through a complicated process is inspected for characteristics and defective states by various electrical tests.

Specifically, in the electrical test of a semiconductor device such as a semiconductor integrated circuit device such as a package IC and an MCM, and a wafer having an integrated circuit formed thereon, the semiconductor device is seated in a test socket in which a tester is installed, so as to electrically connect a conductive part and a test pin of a test device to each other as terminals formed on one surface of the semiconductor device to be inspected.

As the integration of semiconductor devices has recently developed, the time required to inspect one semiconductor device has increased. Accordingly, in the industry, a plurality of semiconductor devices are simultaneously tested to increase the inspection efficiency of the semiconductor device.

That is, the test efficiency of the semiconductor device is determined according to the number of test sockets provided. However, since a space for testing semiconductor devices is limited, it is necessary to minimize the size of test sockets in order to increase the number of semiconductor devices inspected.

However, when the size of the test socket is minimized, the outer wall of the test socket inevitably becomes thinner, causing a problem in that the test socket is deformed or damaged during a semiconductor device inspection process.

Therefore, there is a need for a test socket capable of testing semiconductor devices without deformation of or damage to the test socket while minimizing the size of the test socket.

SUMMARY OF THE INVENTION

Technical Problem

The present invention is to solve the above problems, and the present invention is directed to providing a test socket in which a first guide part and a second guide part of a cover are not damaged even when the thickness of the outer wall of the cover is made thin.

The present invention is directed to providing a test socket capable of stably supporting the up-down motion of a cover.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

Technical Solution

According to an aspect of the present invention, provided is a test socket energizably connected to a semiconductor device to electrically test the semiconductor device, the test socket including a base on which a seating part on which the semiconductor device is seated is formed and a test pin protruding from the seating part in one direction, the test pin contactable with a conductive part of the semiconductor device; a cover capable of reciprocating a first position located at an end of the base in one direction and a second position located apart from the first position in the one direction; and a support member coupled to the base and supporting an outer surface of the cover.

In this case, the cover may include a cover body; a through part formed through the cover body in the one direction so that the semiconductor device can be seated in the seating part; and a first guide part extending from one side of the cover body to the other direction, and the base may include a base body having the seating part formed on one surface thereof; and a first guide groove recessed from an outer surface of one side of the base body to guide the motion in one direction or the other direction by inserting the first guide part.

In this case, the support member may include a first support part disposed to support an outer surface of the first guide part and an outer surface of the base body while the cover reciprocates between the first position and the second position.

In this case, the cover body and the first guide part may be integrally formed by injection molding.

In this case, the cover may further include a guide protrusion protruding from an inner surface of the first guide part and extending in the one direction and the base may further include a second guide groove further recessed from the first guide groove to guide the motion in the one direction or the other direction by inserting the guide protrusion.

In this case, the support member may be formed to surround outer surfaces of the cover and the base.

In this case, the support member may extend in the one direction to an end of the cover in the one direction in a state where the cover is located in the second position.

In this case, the support member may further include a latching protrusion protruding from the inner surface, and the base may further include a latching groove into which the latching protrusion is inserted so that the support member is fixed to the base.

In this case, the support member may further include an elastic providing hole disposed to surround a part of a circumference of the latching protrusion so that the latching protrusion can be inserted into the latching groove.

In this case, the cover may include a second guide part extending in the other direction from the other side of the cover body, the base may further include a third guide groove recessed from an outer surface of the other side of the base body to guide the motion in the one direction or the other direction by inserting the second guide part, and the support member may include a second support part disposed to support an outer surface of the second guide part and an outer surface of the base body while the cover reciprocates between the first position and the second position.

In this case, the support member may be formed of a material having greater strength than that of the first guide part.

In this case, an elastic member disposed between the cover and the base to elastically press the cover in the one direction may be further included.

Advantageous Effects

The test socket according to an embodiment of the present invention provides a support member for supporting the first guide part and the second guide part of the cover, and thus, even when the thickness of the outer wall of the cover is made thin, the first guide part and the second guide part of the cover cannot be damaged, and space utilization can be maximized by narrowing the gap between the test sockets.

The test socket according to an embodiment of the present invention can stably support the up-down motion of the cover by making the support member of a material having greater strength than the strength of the cover.

Advantageous effects of the present invention are not limited to the above-described effects, and should be understood to include all effects that can be inferred from the configuration of the invention described in the description or claims of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, exemplary embodiments of the present invention will be described in detail so that those of ordinary skill in the art can readily implement the present invention with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In the drawings, parts unrelated to the description are omitted for clarity of description of the present invention, and throughout the specification, like reference numerals denote like elements.

Terms and words used in the present specification and claims should not be construed as limited to their usual or dictionary definition, and they should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that inventors may appropriately define the terms and concept in order to describe their own invention in the best way.

Accordingly, the embodiments described in the present specification and the configurations shown in the drawings correspond to preferred embodiments of the present invention, and do not represent all the technical idea of the present invention, so the configurations may have various examples of equivalent and modification that can replace them at the time of filing the present invention.

It should be understood that the terms “comprise” or “have” or the like when used in this specification, are intended to describe the presence of stated features, integers, steps, operations, elements, components and/or a combination thereof but not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, elements, components, or a combination thereof.

The presence of an element in/on “front”, “rear”, “upper or above or top” or “lower or below or bottom” of another element includes not only being disposed in/on “front”, “rear”, “upper or above or top” or “lower or below or bottom” directly in contact with other elements, but also cases in which another element being disposed in the middle, unless otherwise specified. In addition, unless otherwise specified, that an element is “connected” to another element includes not only direct connection to each other but also indirect connection to each other.

A description of the reference numerals used in the FIGS. is as follows:1: test socket100: base110: base body111: guide wall120: seating part130: test pin140: first guide groove150: second guide groove160: latching groove170: third guide groove200: cover210: cover body220: through part230: first guide part240: guide protrusion250: cover ventilation part260: second guide part300: support member310: first support part320: second support part330: latching protrusion340: elastic providing hole350: first support member ventilation part360: second support member ventilation part400: elastic member

Hereinafter, a test socket according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.FIG.1is a perspective view of a test socket according to an exemplary embodiment of the present invention.FIG.2is an exploded perspective view of a test socket according to an exemplary embodiment of the present invention.FIG.3is a cross-sectional view illustrating a cross-section taken along line A-A ofFIG.1.FIG.4is a cross-sectional view illustrating a cross-section taken along line B-B ofFIG.1.FIG.5is a cross-sectional view illustrating a cross-section taken along line C-C ofFIG.1.FIG.6is a side view of a test socket according to an exemplary embodiment of the present invention.FIG.7is a cross-sectional view illustrating a cross-section of area D ofFIG.6. In this case, the direction in which the X-axis ofFIG.1is directed is defined as the right direction, the direction in which the Y-axis is directed is defined as the forward direction, and the direction in which the Z-axis is directed is defined as the upward direction.

The test socket1according to an embodiment of the present invention serves to fix a semiconductor device and a tester to be connected energizably in the process of transmitting and receiving test signals to and from the semiconductor device (not shown) such as a semiconductor integrated circuit device such as a package IC, an MCM, or a wafer having an integrated circuit to test whether the semiconductor device is normally operating.

In this case, the test socket1may include a tester capable of transmitting and receiving test signals to and from the semiconductor device to test the semiconductor device. That is, a tester may be included in a base100to be described later. However, since the main feature of the present invention lies in the support member300stably supporting the movement of the cover200, the following will focus on the relationship between the cover200and the support member300.

As shown inFIGS.1and2, the test socket1according to an embodiment of the present invention includes a base100, a cover200, a support member300and an elastic member400.

As shown inFIGS.1and2, a seating part120on which a semiconductor device is seated is formed on the upper surface of the base100. The semiconductor device is formed in a plate shape, and is seated on the seating part120with one surface of the plate-shaped semiconductor device facing the seating part120.

A test pin130that can contact a conductive part (not shown) formed on one surface of the semiconductor device is provided in the base100. In this case, the test pin130protrudes upward from the seating part120to come into contact with the conductive part of the semiconductor device.

Although not shown in the drawings, a plurality of conductive parts may be disposed on one surface of the semiconductor device, and the test pins130provided on the seating part120may be disposed to correspond to the number of conductive parts.

In this case, the shape of the conductive part contacting the test pin130or the material forming the conductive part is not limited, and various known shapes or materials may be used.

As shown inFIG.2, the base100includes a base body110in a hexahedral shape in which the seating part120is formed on the upper surface. The base body110does not have to be formed in the shape of a hexahedron as long as it extends in the up-down direction, but may be formed in various pillar shapes.

A plurality of seating parts120formed on the base body110may be provided. That is, as shown inFIG.1, two seating parts120may be formed on one base body110, and thus, two semiconductor devices may be simultaneously tested with one test socket1.

Although not shown in the drawings, inside the base body110, a tester capable of transmitting an electrical signal to a semiconductor device and receiving an electrical signal that has passed through the semiconductor device is disposed. The tester is energizably connected to the semiconductor device through the test pin130.

As shown inFIG.1, a guide wall111for guiding the semiconductor device may protrude upward around the seating part120of the base body110. The guide wall111may be integrally formed along the circumference of the seating part120, or may be formed on a part of the circumference along the circumference.

The guide wall111may have a thinner thickness toward the upper side so as to easily guide the semiconductor device to the seating part. Accordingly, an inclined surface may be formed on the seating part120side of the guide wall111.

As shown inFIGS.1and2, the cover200is disposed above the base100. The cover200reciprocates between a first position located at the upper end of the base100and a second position located above the first position and spaced apart from the first position.

As the cover200reciprocates up and down between the first position and the second position, the cover200presses the other surface of the semiconductor device so that the conductive part of the semiconductor device can sufficiently contact the test pin130in a state where the semiconductor device is seated on the seating part120, or provides a space for the semiconductor device to be seated on or removed from the seating part120.

To this end, a latch (not shown) may be coupled to the cover200of the test socket1according to an embodiment of the present invention. The latch may press the semiconductor device toward the seating part120in a state where the cover200is positioned in the first position or the second position. As a mechanism by which the latch can press the semiconductor device, various well-known mechanisms may be used. A detailed description thereof is omitted in this specification.

As shown inFIGS.1and2, the cover200of the test socket1according to an embodiment of the present invention includes a cover body210and a through part220.

The cover body210is formed to correspond to the base body110. A through part220penetrating in the up-down direction is formed in the central part of the cover body210. The through part220provides a passage through which the semiconductor device can be seated on the seating part120of the base body110. That is, the semiconductor device passes through the through part220and moves to the seating part120.

As shown inFIG.2, the inner surface of the through part220formed in the cover body210may come into contact with the guide wall111. The guide wall111extends in the up-down direction along the inner surface of the through part220. The cover body210is guided more stably when moving in the up-down direction by the outer surface of the guide wall111.

The cover200of the test socket1according to a modified embodiment of the present invention may be formed so that the outer surface of the base body110can come into contact with the inner surface of the through part220of the cover body210. That is, when the cover body210is in the first position, the lower end of the cover body210and the upper end of the base body110may be partially overlapped.

As shown inFIGS.1and2, the support member300is disposed on outer surfaces of the base100and the cover200. The support member300serves to prevent separation of the cover200and guide the movement of the cover200while the cover200reciprocates between the first position and the second position with respect to the base100.

In this case, the support member300is coupled to and fixed to the base body110. That is, the support member300and the base100are fixed, and only the cover200moves relatively.

To this end, as shown inFIG.3, the support member300is formed to surround the upper surface disposed around the cover body210and the base body110. The support member300is formed in a tubular shape, and the inner surface of the support member300is formed to correspond to the outer surface of the cover body210so that in a state in which the cover200and the base100are coupled, the support member300can guide the movement of the cover200in a state fixed by the base100.

The length d in the up-down direction of the support member300is not limited. In other words, as long as the support member300can support the motion of the cover200by supporting a part of the outer surface of the cover body210in a state where the lower end is fixed to the base body110, the length to which the upper side extends is not limited. In this embodiment, as shown inFIGS.4and5, the upper end of the support member300extends upward to reach the upper end of the cover body210in a state where the cover200is located in the second position. Through this, the motion of the cover200can be more stably supported.

In particular, it is possible to prevent the cover200from moving in an inclined state while the cover200moves in the up-down direction. Through this, contact between the semiconductor device and the tester may be increased by pressing the semiconductor device toward the seating part120with a uniform force.

The shape of the support member300is not limited as long as it can guide the cover200while supporting the motion of the cover200. As shown inFIG.2, the support member300is formed in a quadrangular tubular shape, and the cover200and the base100may be sequentially disposed therein from above. In this case, the thickness of the support member300may be formed uniformly, and the size of the thickness may be 0.2 mm or more and 0.6 mm or less.

As shown inFIG.2, the elastic member400presses the cover200upward so that the cover200can be located in the second position in a situation where no external force is applied to the cover200.

As long as the elastic member400can press the cover200upward, there are no limitations on the location and the pressing structure. For example, it may be a spring disposed between the cover body210and the base body110, and as shown inFIG.2, it may be a structure that presses the cover body210to one end using a pivotally rotating member.

Meanwhile, in order to guide the up-down motion of the cover200, the test socket1according to an embodiment of the present invention includes a first guide groove140, a first guide part230, and a first support part310.

As shown inFIGS.2and3, the first guide groove140is formed by being recessed in the outer surface of the base body110. More specifically, the first guide groove140is formed on the front surface of the base body110. In addition, the first guide groove140may be formed in plurality. Accordingly, the first guide groove140may be formed to face each other on the front and rear surfaces. The first guide groove140is formed to extend in the up-down direction. The width of the first guide groove140in the left-right direction is formed uniform.

The first guide part230is inserted into the first guide groove140. In this case, as shown inFIG.2, the first guide part230is formed extending downward from the cover body210. The first guide part230is inserted into the first guide groove140and moves up and down along the extension direction of the first guide groove140.

The first guide part230may be formed in plurality like the first guide groove140. In this case, the first guide part230and the first guide groove140are formed in corresponding numbers, and each first guide part230is inserted into each first guide groove140.

The plurality of first guide parts230may be disposed to face each other on the front and rear sides of the cover body210like the first guide groove140. That is, a pair of first guide parts230and a pair of first guide grooves140may be disposed to face each other with the through part220of the cover200and the seating part120of the base100interposed therebetween, respectively.

As the pair of first guide parts230and the pair of first guide grooves140are disposed facing each other in the front-rear direction, it is possible to prevent the cover200from tilting in the front-rear direction while the cover200moves in the up-down direction.

A cross-section perpendicular to the up-down direction of the first guide part230may be formed to be the same as a cross-section perpendicular to the up-down direction of the first guide groove140. When the first guide part230is inserted into the first guide groove140, there may be no step difference between the outer surface of the first guide part230and the outer surface of the base body110. Accordingly, even though the inner surface of the support member300is simply manufactured without a step difference, the cover200can be guided using the support member300.

The cover body210and the first guide part230may be integrally formed by injection molding. That is, the cover200can be easily manufactured even if a separate first guide part230is not coupled to the cover body210.

As shown inFIGS.3and4, the support member300includes a first support part310to support the outer surface of the first guide part230. In a state where the first guide part230is inserted into the first guide groove140, the first support part310is in contact with the outer surface of the base body110at the same time except for the outer surface of the first guide part230and the first guide groove140.

The first support part310is not limited in shape as long as it can support the first guide part230as a part of the support member300. For example, as shown inFIG.3, it may be a front side part and a rear side part of a quadrangular tubular support member300.

Since the first support part310additionally supports the outer surface of the first guide part230, it is possible to additionally prevent the cover body210from being partially tilted in the front-rear direction while moving in the up-down direction.

In addition, since the first support part310is provided, it is possible to prevent the first guide part230from being deformed or damaged while the cover body210is tilted in the front-rear direction. More specifically, it serves to reinforce the rigidity of the first guide part230, which inevitably becomes thinner in the process of manufacturing the test socket1as small as possible in order to simultaneously test a large amount of semiconductor devices.

In particular, as in the present embodiment, when the thickness of the first guide part230is manufactured to be 0.3 mm to 1 mm, the first guide part230is easily damaged due to bending deformation in the front-rear direction, and thus, it is necessary to reinforce the first guide part230with the support member300.

To this end, the support member300including the first support part310is formed of a material having greater strength than that of the cover200, more specifically, the first guide part230of the cover200. For example, the first support part310may be formed of stainless steel. However, the support member300is not necessarily formed of stainless steel, and the material is not limited as long as it has a strength greater than that of the first guide part230so as to assist the first guide part230.

Meanwhile, as shown inFIGS.3and4, a guide protrusion240may be formed to protrude from the inside of the first guide part230. The guide protrusion240extends in the up-down direction so that it does not prevent the first guide part230from being guided by the first guide groove140.

In this case, the guide protrusion240is inserted into and guided by a second guide groove150formed by being additionally recessed into the first guide groove140. That is, the first guide groove140and the second guide groove150are formed with a step difference equal to the protrusion thickness of the guide protrusion240.

Since the guide protrusion240and the second guide groove150are formed, it is possible to further prevent the first guide part230from tilting in the left-right direction while being guided by the first guide groove140. That is, the left and right outer surfaces of the guide protrusion240and the left and right inner surfaces of the second guide groove150come into contact to prevent the cover200from tilting in the left-right direction while moving up and down.

Meanwhile, in order to guide the up-down motion of the cover200, the test socket1according to an embodiment of the present invention may further include a third guide groove170, a second guide part260, and a second support part320.

As shown inFIGS.2and3, the third guide groove170is formed by being recessed in the other outer surface of the base body110where the first guide groove140is not formed. More specifically, the third guide groove170is formed on the left surface of the base body110. In addition, the third guide groove170may be formed in plurality. Accordingly, the third guide groove170may be formed to face each other on the left and right surfaces. The third guide groove170is formed to extend in the up-down direction. The width of the third guide groove170in the left-right direction is formed uniform.

The second guide part260is inserted into the third guide groove170. In this case, as shown inFIG.2, the second guide part260is formed to extend downward from the other part of the cover body210where the first guide part230is not formed. The second guide part260is inserted into the third guide groove170and moves up and down along the extension direction of the third guide groove170.

The second guide part260may be formed in plurality like the third guide groove170. In this case, the second guide part260and the third guide groove170are formed in corresponding numbers, and each second guide part260is inserted into each third guide groove170.

The plurality of second guide parts260may be disposed to face each other on the left and right sides of the cover body210like the third guide groove170. As shown inFIG.2, the two pairs of second guide parts260and the two pairs of third guide grooves170may be disposed to face each other with the through part220of the cover200and the seating part120of the base100interposed therebetween, respectively.

As the two pairs of second guide parts260and the two pairs of third guide grooves170are disposed facing each other in the left-right direction, it is possible to prevent the cover200from tilting in the left-right direction while the cover200moves in the up-down direction. Therefore, by providing both the first guide part230and the second guide part260, the cover200can perform a reciprocating motion in the up-down direction without having an inclination with respect to a surface perpendicular to the up-down direction.

A cross-section perpendicular to the up-down direction of the second guide part260may be formed to be the same as a cross-section perpendicular to the up-down direction of the third guide groove170. When the second guide part260is inserted into the third guide groove170, there may be no step difference between the outer surface of the second guide part260and the outer surface of the base body110. Accordingly, even though the inner surface of the support member300is simply manufactured without a step difference, the cover200can be guided using the support member300.

The cover body210and the second guide part260may be integrally formed by injection molding. That is, the cover200can be easily manufactured even if a separate second guide part260is not coupled to the cover body210.

As shown inFIGS.3and5, the support member300includes a second support part320to support the outer surface of the second guide part260. In a state where the second guide part260is inserted into the third guide groove170, the second support part320is in contact with the outer surface of the base body110at the same time except for the outer surface of the second guide part260and the third guide groove170.

The second support part320is not limited in shape as long as it can support the second guide part260as a part of the support member300. For example, as shown inFIG.3, it may be a left side part and a right side part of a quadrangular tubular support member300.

Meanwhile, the test socket1according to an embodiment of the present invention includes a latching protrusion330and a latching groove160to fix the support member300to the base100.

As shown inFIGS.2and7, the latching protrusion330is formed to protrude from the inner surface of the support member300, and the latching groove160is formed to be recessed into the outer surface of the base body110. Accordingly, the latching protrusion330is seated in the latching groove160so that the support member300can be fixed to the base100.

In this case, the latching protrusion330and the latching groove160are disposed at positions corresponding to each other. In particular, in a state where the latching protrusion330is inserted into the latching groove160, the latching groove160is formed such that the height of the upper end of the support member300is the same as the height of the upper end of the cover200located in the second position. However, there is no limitation on the positions where the latching groove160and the latching protrusion330that satisfy the above conditions are formed.

The latching protrusion330and the latching groove160may be formed in plural or, more specifically, in pairs. When the latching protrusion330and the latching groove160are formed in pairs, they may be formed to face each other.

In this embodiment, the latching groove160is formed on the left and right surfaces of the base body110. In addition, corresponding thereto, the latching protrusion330is formed as a pair on the inner surface of the second support part320of the support member300. Through this, the latching protrusions330protrude toward each other, so that in a state in which the latching protrusion330is seated in the latching groove160, by the first support part310of the support member300, the latching protrusion330can firmly maintain a seated state without being separated from the latching groove160.

As shown inFIGS.2and6, in order for the latching protrusion330to be seated in the latching groove160, an elastic providing hole340may be formed around the latching protrusion330. The elastic providing hole340allows the side portion of the support member300to support the latching protrusion330to be elastically deformed in the process of coupling the base100to the support member300.

To this end, the elastic providing hole340may be formed in a U shape with an open upper side. In this case, the support member300is coupled to the base100while moving from the upper side to the lower side.

In addition, as shown inFIG.7, an inclined surface may be formed at the fore-end of the latching protrusion330so that the support member300is moved from the upper side to the lower side to be easily moved along the outer surface of the base body110without being damaged in the process of being coupled to the base100.

Meanwhile, in order to circulate heat that may be generated in the process of inspecting a semiconductor device to the outside, the test socket1according to an embodiment of the present invention may include a cover ventilation part250and a first support member ventilation part350.

As shown inFIGS.1and2, the cover ventilation part250is formed in the cover body210so that the through part220can communicate fluidly with the outside through the outer wall of the cover body210. In this case, the cover ventilation part250is formed by being recessed downward from the upper end of the cover body210. Accordingly, fluid communication between the through part220of the cover body210and the outside of the cover body210is possible.

In this case, as shown inFIG.2, a plurality of cover ventilation parts250may be formed on the front and rear surfaces of the cover body210and may extend to an end of the first guide part230formed on the cover body210. Accordingly, the area through which the through part220and the outside can communicate with each other is widened.

In this case, the first support member ventilation part350is formed in a shape corresponding to the cover ventilation part250in the support member300. More specifically, the first support member ventilation part350is formed so that the first support member ventilation part350and the cover ventilation part250can be disposed side by side in the same position in a state where the cover200is located in the second position.

As shown inFIGS.1and2, as the cover ventilation part250is formed on the front and rear surfaces of the cover body210, a second support member ventilation part360is formed on the left and right surfaces of the support member300. The second support member ventilation part360is formed through the second support part320of the support member300.

The second support member ventilation part360is formed at a position corresponding to a space formed between the lower end of the cover body210and the upper end of the base body110in a state where the cover200is located in the second position.

Like the first support member ventilation part350, the second support member ventilation part360serves to connect the through part220and the outside in a fluid communication manner. However, the second support member ventilation part360is opened only when the cover200is located in the second position, and when the cover200is located in the first position, some or all of the left and right surfaces of the cover body210may be closed.

As described above, preferred embodiments according to the present invention have been examined, and it is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments. Therefore, the above-described embodiments are to be construed as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.