KR20020076560A - Apparatus For Opening and Closing The Cover of Mobile Communication Terminal - Google Patents

Abstract

PURPOSE: A device for opening and closing a cover in a mobile communication terminal is provided to offer convenience to a user by automatically opening the cover by a simple operation for pushing a button. CONSTITUTION: A housing(40) is fixed to one between a body(1) or a cover(4). A fixed cam axis(50) has the first cam surface(51) at its one side for being inserted into the housing(40) to be capable of rotation, and the other side of fixed cam axis(50) is fixed to the other to which the housing is not fixed between the body(1) or the cover(4). A rotation cam axis(60) has the second cam surface(61) corresponding to the first cam surface(51) at its one side to be inserted into the housing(40) to be incapable of rotation and be capable of axis-direction sliding. The first elastic member(80) provides a rotation force to the housing(40) in a cover opening direction. The second elastic member(100) elastically supports the rotation cam axis(60) in the direction of the fixed cam axis(50) for sticking the first cam surface(51) and the second cam surface(61). An operation axis(120) slides the rotation cam axis(60) in a direction separated from the fixed cam axis(50) according to the push of a user.

Description

Cover opening and closing device of mobile communication terminal {Apparatus For Opening and Closing The Cover of Mobile Communication Terminal}

The present invention relates to a device for opening and closing a cover of a mobile communication terminal, and more particularly, to a cover opening and closing device of a mobile communication terminal to open the cover automatically by pressing a button.

Commonly used cell phones, cellular phones, cellular phones, personal communications services phones (PCS) phones, mobile telephones, personal cellular phones, wireless communication terminals, wireless application protocol phones, and personal digital assistants (PDAs). A mobile communication terminal, which is widely applied to a mobile terminal (Assistance) terminal and an International Mobile Telecommunications 2000 (IMT2000) terminal, carries a voice call with the other party while carrying an individual, simultaneously conducts a voice and video call, or sends a text message. It's a convenient communication tool that's always close to you, such as giving and receiving, accessing the Internet, and sending and receiving e-mail.

These mobile communication terminals have been developed to be easy to carry, more convenient and versatile because they are frequently carried and used in everyday life, and are small enough to fit in the pocket of a shirt. A variety of forms, such as a terminal, a flip type terminal, a folder type terminal, or a dual LCD terminal, satisfy the needs of consumers.

Among these mobile communication terminals, mobile communication terminals called mobile phones, cellular phones, cellular phones, PCS phones, mobile phones, or mobiles are most popularly used, and their development speed is very fast. It is provided in a convenient form of degree.

However, even in such a terminal, a device capable of automatically opening a cover called a flip or a folder from the main body has not been considered.

For this reason, there is an inconvenience of having to lift the cover directly from the main body when the cover is opened, and if the user lifts the cover with only one hand without using both hands, it is easy to slip the hand without fully opening the cover. There was a frequent discontinuation of the phone disconnection.

Accordingly, an object of the present invention is to provide a cover opening and closing device of a mobile communication terminal while opening and closing the cover automatically by pressing and operating a button.

1 is a view showing an example of implementing a cover opening and closing device according to the present invention to a general mobile phone

Figure 2 is a cross-sectional view of the cover opening and closing apparatus according to the present invention, when the cover is opened as a reference

FIG. 3 is a sectional view taken along line I-I of FIG. 2, showing only the opening and closing device in the state excluding the main body and the cover.

Figure 4 is an exploded perspective view of the cover opening and closing apparatus according to the present invention

FIG. 5 is a front view of each component in FIG. 4; FIG.

Figure 6 is a sectional view of the main part showing a closed state of the cover of the operating state of the present invention

Figure 7 is a sectional view of the main part showing the initial cover opening state of the operating state of the present invention

8 is a sectional view showing the main parts of a state in which the cover is completely opened during the operation of the present invention;

<Explanation of symbols for the main parts of the drawings>

1 body 4 cover

30: switchgear 40: housing

41: guide groove 42: coupling groove

50: fixed camshaft 51: the first cam surface

52: fixed shaft 53: spline

54: coupling hole 55: hole

56: following protrusion 60: rotating camshaft

61: second cam surface 62: insertion axis

63: guide protrusion 70: hinge handle

71: spline ball 72: groove

80: first elastic means 81: one end of the first elastic means

82: other end of the first elastic means 90: holder

91: insertion hole 100: the second elastic means

110: hinge cover 111: elastic piece

120: operating axis 121: button

122: button axis 130: hinge axis

131: clip portion a: steep slope

b: Top land surface c: Medium slope

d: end slope

In order to achieve the above object, the cover opening and closing apparatus of the mobile communication terminal includes a housing fixed to one of a mobile communication terminal body or a cover; A fixed camshaft having a first cam surface on one side and rotatably inserted into the housing, the other side of which is fixed to the other one of the main body or the cover that is not fixed to the housing; A rotating cam shaft having a second cam surface corresponding to the first cam surface on one side thereof and being rotatably coupled to the housing while being slidably inserted in the housing; First elastic means for providing a rotational force to the housing in a cover opening direction; Second elastic means for elastically supporting the rotating cam shaft in the fixed cam shaft direction to closely contact the first cam surface and the second cam surface; And an operation shaft for axially sliding the rotary cam shaft in a direction away from the fixed cam shaft as the user presses it. Characterized in that comprises a.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention specifically implementing the above technical features will be described in more detail.

Although the example described in the drawings shows the technical features of the mobile communication terminal of the present invention described above implemented in a mobile phone, the same technical category may be applied to various types of mobile communication terminals described at the beginning of the present specification. This is referred to as the claims of the present invention, hereinafter all collectively referred to as a mobile communication terminal.

The mobile communication terminal shown in FIG. 1 has an input key 2 and a telephone receiver 3 on the main body 1, and has a liquid crystal panel 5 and a receiver 6 on a cover 4 which is hinged thereto. A typical clamshell mobile communication terminal is illustrated, in which the hinge parts 7 and 8 of the main body 1 and the cover 4 are hinged as the cover opening and closing device 30 according to the present invention. do.

2 to 5 show the cover opening and closing device 30 according to the present invention in detail.

As shown, the cover opening and closing device 30 includes a housing 40 having a cross section having a polygonal cylinder, preferably a quadrangular cylinder.

The inside of the housing 40 is inserted into the fixed cam shaft 50 in a rotatable state, and the rotating cam shaft 60 is not rotatable in the axial direction opposite to the fixed cam shaft 60 thereof. It is coupled to be slidable.

The housing 40 is fixed to one side of the terminal body 1 or the cover 4, and the fixed camshaft 60 is the rest of the body (1) or the cover 4, the housing 40 is not fixed Can be rotated relative to each other is fixed to one. In the illustrated embodiment, the housing 40 is inserted into the hole 9 provided in the hinge portion 7 of the terminal cover 4 and fixed to be integral with the cover 4, and the fixed camshaft 60 is fixed. One end of the) is fixed to the hinge portion 8 of the terminal body 1, hereinafter will be described based on this installation state.

The fixed cam shaft 50 has a first cam surface 51 is formed on one side, the fixed shaft 52 is formed to extend from the first cam surface 51 to protrude out of the housing 40, the fixed shaft protruding ( 52, a spline 53 is formed at the end. The hinge handle 70 is forcibly coupled to the spline 53 at the spline 53, and the coupled hinge handle 70 is fixed to the hinge portion 8 of the terminal body 1, thereby fixing the cam shaft 50. ) Is fixed to the main body 1 in a state where no operation can be performed. In the present embodiment, the hinge handle 70 has a plurality of grooves 72 formed on the outer circumference thereof, and a hole 10 into which the hinge handle 70 can be inserted is formed in the hinge portion 8 of the terminal body 1. And a protrusion 11 inserted into the groove 72 at an inner circumference of the hole 10 so that the hinge handle 70 is inserted into the hole 10 when the hinge handle 70 is inserted into the hole 10. The groove 72 and the protrusion 11 of the hinge portion 8 are engaged.

The rotary cam shaft 60 is inserted into the housing 40 in a state in which the axial movement is possible but cannot be rotated relative to one side, and a second cam surface in contact with the first cam surface 51 of the fixed cam shaft 50 on one side thereof. (61), the insertion shaft (62) extends from the second cam surface (61), and the insertion shaft (62) is inserted into the coupling hole (54) of the fixed cam shaft (50) so as to be rotatable and rotatable. .

The combination of the rotary cam shaft 60 and the housing 40, the guide groove 41 is formed on both sides of the housing 40, the guide projection 63 on the outer circumference of the second cam surface 61 of the rotary cam shaft 60 ) Is formed, and the guide protrusion 63 thereof is axially slidably coupled to the guide groove 41. Therefore, the rotating camshaft 60 is movable in the axial direction to the housing 40 but cannot rotate. As the rotating camshaft 60 rotates, the housing 40 and the cover 4 rotate integrally. .

In addition, a first elastic means 80 is interposed between the fixed camshaft 50 and the housing 40 to impart rotational force in the opening direction of the cover 4 to the housing 40. The first elastic means 80 is preferably made of a torsion spring so that one end 81 is inserted into the hole 55 of the fixed camshaft 50 and the other end 82 is fixed to the housing 40. In the housing 40, a separate holder 90 is rotatably inserted so that the other end 82 of the torsion spring is inserted into an insertion hole 91 provided in the holder 90. Since the fixed camshaft 50 is fixed to the terminal body 1 side, the rotational force of the first elastic means 80 is transmitted to the housing 40 through the holder 90.

In addition, the second cam surface of the rotary cam shaft 60 on the first cam surface 51 of the fixed cam shaft 50 by elastically supporting the rotary cam shaft 60 in the direction of the fixed cam shaft 50 on one side of the housing 40. The second elastic means 100 is provided so that the 61 is in close contact. Its second elastic means 100 is preferably made of a compression spring, as shown is interposed between one end of the housing 40 and the rotary cam shaft 60.

One end of the housing 40, that is, the side of the rotating camshaft 60 is opened for easy assembly, and the hinge cover 110 is coupled to and blocked by the opened portion. One side of the guide groove 41 of the housing 40 has a more extended coupling groove 42 is formed, the elastic piece 111 is formed on both sides of the hinge cover 110, the elastic piece 111 of the It is elastically extended to the coupling groove 42 is inserted so as not to be separated.

And the operation shaft 120 for operating this opening-closing apparatus 30 is provided, and it has a structure which spaces the rotation cam shaft 60 from the fixed cam shaft 50 as this operation shaft 120 presses. Its operation shaft 120 is composed of a button 121 and a button shaft 122 extending from the button 121 so that the button shaft 122 is inserted in a state capable of rotating and moving from the end of the fixed cam shaft 50 And its end is rotatably and immovably coupled to the rotating camshaft 60. Therefore, as the user presses the button 121, the rotating camshaft 60 is moved away from the fixed camshaft 50.

In addition, in the present embodiment, the first cam surface 51 of the fixed cam shaft 50 is provided with a tracking protrusion 56 protruding in the direction of the rotation cam shaft 60, and the second cam surface (of the rotary cam shaft 60) 61 is a structure having a concave-convex shape, in which the following protrusion 56 of the fixed cam shaft 50 is in contact with the concave-convex cam surface of the rotary cam shaft 60 to follow the concave-convex shape of the cam surface.

According to the present invention, it is also possible to form the first cam surface 51 and the second cam surface 61 in opposite directions. That is, the rotating camshaft 60 may be provided with the 1st cam surface 51 which has the following protrusion 56, and the said 2nd cam surface 61 of the uneven | corrugated form may be provided in the fixed camshaft 50 correspondingly.

In addition, the second cam surface 61 of the concave-convex shape is particularly rotated relative to the following protrusion 56 and the magnetic force corresponding to the state in which the terminal cover 4 is closed, as shown in FIGS. 4 to 6. In order to prevent this from happening, the steep slope inclined upward (a) can overcome the rotational force of the first elastic means 80 by the support force by the second elastic means 100 and the inclination of the second cam surface 61. And a top land surface (b) formed at a predetermined distance flat from an end of the steep slope (a) while forming a peak of the cam corresponding to the initial time when the cover (4) is opened by magnetic force, and the cover (4). Corresponding to the time point at which the magnetic force is further opened, the middle slope surface c extending downward while forming a gentle slope from the end of the top land surface b and the time point at which the cover 4 is completely opened. Intermediate slope thereof from the end of the intermediate sloped surface (c) Composed of (c) the terminal slope (d) having a gentle slope, rather than more rapidly than the downward slope of luggage as well as the steep part (a).

The uneven second cam surface 61 has two independent uneven cam surfaces having the same shape at regular intervals along a circle, and the following protrusions 56 correspond to two independent uneven cam surfaces. It is formed as an independent same following protrusion 56. Since the opening angle of the cover 4 is usually maintained at an angle of 120 degrees to 130 degrees, the uneven cam surface 61 is formed by dividing a circle of 360 degrees in half in accordance with this angle.

On the other hand, as shown in Figure 2, on the opposite side of the cover opening and closing device 30 is provided with a hinge shaft 130 for hinge hinged to the hinge portion 8 of the main body 1, the opening and closing The clip portion 131 formed at the end of the hinge cover 110 of the device is coupled to the distance 140, the elastic member 150 is interposed between the hinge axis 130 and the distance 140 of the hinge shaft ( 130 is elastically pressed to the hinge portion 8 side of the main body 1.

6 to 8 illustrate the operation process of the cover opening and closing device of the mobile communication terminal of the present invention made as described above, the upper part of the drawing shows only the main portion of the cover opening and closing device is shown in cross section, While showing the cam surface of the uneven shape, that is, the second cam surface 61 is developed, the relative position of the following protrusion 56 of the first cam surface 51 and the second cam surface 61 is divided according to the opening degree of the cover. It is shown.

First, FIG. 6 shows a state in which the cover 4 is closed. As in the above description, the fixed camshaft 60 is fixed to the terminal body 1 side, and the housing 40 is fixed to the cover 4. The explanation will be made based on the case.

When the cover 4 of the terminal is closed, the tracking protrusion 56 of the fixed camshaft 50 is positioned at approximately one quarter of the steep slope a of the rotary camshaft 50.

In this case, since the fixed camshaft 50 is fixed to the terminal body 1, the elastic force of the first elastic means 80 tries to rotate the holder 90, and the rotational force of the holder 90 is not shown in the housing. As the 40 is about to be rotated, the cover 4 is rotated to open from the main body 1 by this rotational force. In addition, since the rotating camshaft 60 is axially movable by the guide protrusion 63 but is rotatably coupled to the guide groove 41 of the cover 4, the force to rotate the cover 4 is It acts on the rotating camshaft 60 and tries to rotate this rotating camshaft 60 in the direction of the arrow shown in the lower figure.

However, the rotary cam shaft 60 is pressed to the fixed cam shaft 50 by the second elastic means 100, and the following projection 56 of the fixed cam shaft 50 is a steep inclined surface of the rotary cam shaft 60 ( In close contact with a), the rotational force acting on the rotating camshaft 60 by the first elastic member 80 is greater than the force due to the pressing force of the second elastic member 100 and the inclination of the steep slope a. small. Therefore, as the rotary cam shaft 60 does not rotate by magnetic force, the cover 4 may also maintain a stable closed state that cannot be opened by magnetic force.

FIG. 7 shows the initial state of opening of the cover 4, and as described above, in the state where the cover 4 is closed, the user opens the button 121 of the operation shaft 120 in an operation of opening the cover 4. When pressed, the button shaft 122 extending to one side of the button 121 slides the inside of the fixed cam shaft 50 to push the rotary cam shaft 60 in the axial direction, and by this force, the second elastic means 100 Rotation camshaft 60 is spaced apart from the fixed camshaft (50) while being compressed.

When the rotating camshaft 60 is spaced apart from the fixed camshaft 50, the steep inclined surface a of the rotating camshaft 60 is spaced apart from the following protrusion 56 of the fixed camshaft 50, corresponding to the amount of separation. Rotating camshaft 60 is able to rotate. Therefore, the cover 4 is opened by the rotation angle of the rotary cam shaft 60.

The illustrated example shows a state in which the rotating camshaft 60 is rotated in the direction of the arrow until the following protrusion 56 of the fixed camshaft 50 reaches the apex of the steep slope a of the rotating camshaft 60.

In this state, that is, if the button 121 is released before the following projection 56 of the fixed camshaft 50 reaches the peak of the steep slope a of the rotary camshaft 60, the pressing force of the second elastic spring 100 The rotational force of the first elastic member 80 is overcome by the inclination of the steep slope (a) of the cam, and the rotating camshaft 60 is rotated again in the opposite direction of the opening to return to the initial closed state.

Accordingly, the cover 4 does not open without the user operating the button 121 in the state where the following protrusion 56 of the fixed camshaft 50 does not pass the peak of the steep slope a of the rotary camshaft 60. do.

8 shows a state in which the cover 4 is completely open.

In FIG. 7, when the user completely presses the button 121, the steep slope a of the rotary cam shaft 60 is completely released from the following protrusion 56 of the fixed cam shaft 50, thereby rotating the cam shaft 60. 1, the rotational force of the elastic means 80 is received as it is, and rotates in the direction of the arrow, so that the following protrusion 56 of the fixed camshaft 50 is the top land portion that is the apex of the steep slope a of the second cam surface 61 ( b).

As such, when the following protrusion 56 of the fixed camshaft 50 reaches the top land portion b of the steep slope a of the second cam surface 61, only the rotational force of the first elastic member 80 remains. , Even when the button 121 is pulled out, the rotating camshaft 60 rotates without resistance due to the rotational force of the first elastic member 80, so that the following protrusion 56 of the fixed camshaft 50 is second cam surface 61. The top land portion (b), the middle slope (c) and the end slope (d) of the sequential passing through the naturally reached the lowest point of the end slope (d). Thus, the cover 4 also naturally opens with the rotation of the rotary cam shaft 60.

As described above, in the process of automatically opening the rotary cam shaft 60 and the cover 4, the elastic force of the first elastic member 80 is the greatest in the state in which the cover 4 is closed (see FIG. 6), and the rotary cam shaft As the 60 and the cover 4 are further rotated, they gradually decrease, and when the following protrusion 56 reaches the end portion of the distal inclined surface d of the second cam surface 61, it is almost exhausted, thereby opening the cover 4. This can go smoothly and naturally.

Referring to FIG. 8 again, the process of closing the cover 4 will be described.

When the user closes the cover 4 by hand to end the use of the mobile communication terminal, the rotating camshaft 60 rotates in the opposite direction at the time of opening, that is, the direction opposite to the arrow shown, thereby allowing the second cam surface 61 to be rotated. The following projection 56 at the end of the end inclined surface (d) forms the form of the back inclined surface (d), the middle inclined surface (c), and the top land portion (b), and the holder is rotated by the cover (4). As the 90 rotates, the first elastic member 80 is gradually compressed.

As such, the force compressing the first elastic member 80 increases as the cover 4 is closed, thereby giving a fresh feeling of operation to the fingertips of the user closing the cover 4.

Next, when the cover 4 is further rotated so that the following protrusion 56 passes the top land portion b of the second cam surface 61, the following protrusion 56 is a steep slope of the second cam surface 61. By meeting (a), the cover 4 is automatically closed by the inclination of the steep slope a and the pressing force of the second elastic member 100 as described above in the initial opening of the cover 4.

According to the preferred direction of the present invention, the point at which the cover 4 is automatically closed, that is, the position of the apex of the steep slope a is set at an angle of approximately 14 to 18 degrees from the point of time when the cover 4 is closed. Therefore, the point at which the cover 4 is automatically closed is the last point at which the cover 4 is closed without opening when the pressing force of the button 121 is released when the cover 4 is opened.

As described above, according to the cover opening and closing device of the mobile communication terminal, the cover is automatically opened by a simple operation of pressing a button, thereby providing more convenience to the user, and the opening and closing operation of the cover is performed by the first elastic member. By the arrangement of the appropriate force of the second elastic member, the rotary cam and the fixed cam is to be performed smoothly and stably.

Claims (14)

A housing fixed to one of a mobile communication terminal body or a cover; A fixed camshaft having a first cam surface on one side and rotatably inserted into the housing, the other side of which is fixed to the other of the main body or the cover that is not fixed to the housing; A rotating cam shaft having a second cam surface corresponding to the first cam surface on one side thereof and being rotatably coupled to the housing while being slidably inserted in the housing; First elastic means for providing a rotational force to the housing in a cover opening direction; Second elastic means for elastically supporting the rotating cam shaft in the fixed cam shaft direction to closely contact the first cam surface and the second cam surface; And An operation shaft for axially sliding the rotary cam shaft in a direction away from the fixed cam shaft as a user presses it; Cover opening and closing device of a mobile communication terminal, characterized in that comprises a. The method of claim 1, One of the first cam surface and the second cam surface is formed in the concave-convex shape, the other one of the cover opening and closing device of the mobile communication terminal, characterized in that consisting of a protruding tracking protrusion to move in contact with the uneven cam surface. The method of claim 1, The first elastic means cover opening and closing device of the mobile communication terminal, characterized in that both ends are respectively fixed to the fixed cam shaft and the housing is a torsion spring to impart rotational force to the housing. The method of claim 3, The cover opening and closing device of the mobile communication terminal, characterized in that it is inserted into the housing rotatably fixed to one end of the torsion spring to be fixed to the housing side. The method of claim 1, The second elastic means is a cover opening and closing device of a mobile communication terminal, characterized in that the compression spring for supporting the rotating camshaft from the inner end of the housing. The method of claim 5, A hinge cover is fixed to a housing end of a portion in which the compression spring is disposed, and one end of the compression spring is supported by a hinge cover thereof. The method of claim 1, A configuration in which the rotating cam is movable in the axial direction while being non-rotating with respect to the housing, The cover opening and closing device of the mobile communication terminal, characterized in that the guide groove in the axial direction is formed on both sides of the housing, the guide projection is slidably coupled to the guide groove on the outer periphery of the rotary cam. The method of claim 1, A spline is formed at one end of the fixed camshaft, and a separate hinge handle having a spline hole coupled to the spline is provided, and the hinge handle is fixed to the other one of the main body or the cover to which the housing is not fixed. Cover opening and closing device of a mobile communication terminal. A housing having a polygonal cylinder section fixed to one of a mobile communication terminal body or a cover; A fixed camshaft having a first cam surface formed of a following protrusion on one side and rotatably inserted into the housing, the other side of which is fixed to the other of the main body or the cover that is not fixed to the housing; A rotating cam shaft having a second cam surface having an uneven shape corresponding to the following protrusion of the first cam surface on one side thereof, being rotatably coupled to the housing and slidably inserted in an axial direction; A holder rotatably inserted into the housing in the fixed camshaft direction; A torsion spring fixed at both ends to the fixed camshaft and the holder to provide a rotational force in the cover opening direction to the housing through the holder; A compression spring that elastically supports the rotating camshaft in the fixed camshaft direction to closely contact the second cam face to the first cam face; And An operation shaft for axially sliding the rotary cam shaft in a direction away from the fixed cam shaft as a user presses it; Cover opening and closing device of a mobile communication terminal, characterized in that comprises a. A housing having a quadrangular cross section fixedly inserted into a cover of a mobile communication terminal; A fixed camshaft having a first cam surface formed of a following protrusion on one side and rotatably inserted into the housing, the other side of which is fixed to the main body; A rotating cam shaft having a second cam surface having a concave-convex shape corresponding to the following protrusion of the first cam surface on one side and being axially slidably coupled to the housing while being rotatably coupled to the housing; A holder rotatably inserted into the housing in the fixed camshaft direction; A torsion spring fixed at both ends to the fixed camshaft and the holder to provide a rotational force in the cover opening direction to the housing through the holder; A compression spring that elastically supports the rotating camshaft in the fixed camshaft direction to closely contact the second cam face to the first cam face; And An operation shaft for axially sliding the rotary cam shaft in a direction away from the fixed cam shaft as a user presses it; Cover opening and closing device of a mobile communication terminal, characterized in that comprises a. A housing having guide grooves formed in axial directions on both sides with a quadrangular cross section inserted into and fixed to a mobile communication terminal cover; A fixed camshaft inserted into the housing in a rotatable state, the fixed camshaft including a first cam surface formed as a following protrusion on one side, and a fixed shaft extending from the first cam surface to form a spline at an end thereof; A hinge handle coupled to the spline of the fixed camshaft by a spline hole and fixed to the main body; A second cam surface having an uneven shape corresponding to the following protrusion of the first cam surface on one side, a guide protrusion protruding to the outer circumference of the second cam surface to be slidably coupled to the guide groove of the housing, and the second cam surface A rotating camshaft extending from and having an insertion shaft rotatably coupled to the coupling hole of the fixed camshaft; A holder having a quadrangular cross section inserted into the housing of the quadrangular cross section in a direction fixed to the fixed camshaft; A torsion spring fixed at both ends to the fixed camshaft and the holder to provide a rotational force in the cover opening direction to the housing through the holder; A hinge cover inserted into and fixed to an end portion of the housing in the rotation cam axis direction; A compression spring interposed between the inner side of the hinge cover and the rotating camshaft to elastically support the rotating camshaft to closely contact the second cam face to the first cam face of the fixed camshaft; The button shaft is composed of a button and a button shaft extending from the button so that the button shaft is rotatably and movable from the spline side of the fixed cam shaft, the end of which is rotatably coupled to the rotating cam shaft so that the user can move the button. An operation shaft for axially moving the rotary cam shaft in a direction away from the fixed cam shaft by pressing; Cover opening and closing device of a mobile communication terminal, characterized in that comprises a. The method according to any one of claims 2, 9, 10 or 11, The uneven cam surface, A steep upward slope that can overcome the rotational force of the first elastic means by the support force and the inclination thereof by the second elastic means so that relative rotation is not made by the following protrusion and the magnetic force corresponding to the closed state of the cover. Cotton, A top land surface formed at a certain distance from the distal end of the steep slope while forming a peak of the cam corresponding to the initial time when the cover is opened by magnetic force; An intermediate inclined surface extending downward while forming a gentle distance from the end of the top land surface in correspondence with the time when the cover is further opened by magnetic force; The cover of the mobile communication terminal, characterized in that the end slope of the intermediate inclined surface more rapidly than the intermediate inclined surface corresponding to the point when the cover is fully opened and the end inclined surface having a gentle slope than the steep inclined surface Switchgear. The method of claim 12, The peak of the steep slope is a cover opening and closing device of the mobile communication terminal, characterized in that formed at a point opening the angle 14 degrees to 18 degrees. The method of claim 12, The uneven cam surface has two independent cam surfaces having the same shape at regular intervals along a circle, and the following protrusions are formed as two independent identical following protrusions corresponding to two independent uneven cam surfaces. Cover switchgear of communication terminal.