EP1961125A1

EP1961125A1 - A swing mechanism for display part of cellular phone

Info

Publication number: EP1961125A1
Application number: EP06823977A
Authority: EP
Inventors: Kyung Seok Kang; Soon Wook Kwon; Kwang Duck Park
Original assignee: Laird Technologies MAP Co Ltd
Current assignee: Laird Technologies Korea YH
Priority date: 2005-12-13
Filing date: 2006-12-07
Publication date: 2008-08-27
Also published as: WO2007069834A1; EP1961125A4; JP2009519669A

Abstract

Disclosed herein is a display-tilting mechanism for communication terminals, in which the display unit thereof can be tilted in both directions to switch over from a portrait orientation to a landscape orientation and vice versa. Further disclosed is an apparatus for rotating or tilting the display unit of a communications terminal and simultaneously slidably opening and closing the communications terminal. Further disclosed is a display-tilting mechanism of a communications terminal, which has an improved cam structure to thereby enable a slim structure of the terminal. Further disclosed is an apparatus for opening and closing a communications terminal in a swing and semi-automatic fashion, in which the retainer means has a transition point at an angle other than 90° to provide a structural stability.

Description

[DESCRIPTION] [Invention Title]

A SWING MECHANISM FOR DISPLAY PART OF CELLULAR PHONE

[Technical Field]

The present invention relates to a display-tilting mechanism for communication terminals, in which the display unit thereof can be tilted in both directions to switch over from a portrait orientation to a landscape orientation and vice versa. The present invention relates to an apparatus for rotating or tilting the display unit of a communications terminal and simultaneously slidably opening and closing the communications terminal. The present invention relates to a display-tilting mechanism of a communications terminal, which has an improved cam structure to thereby enable a slim structure of the terminal. The present invention relates to an apparatus for opening and closing a communications terminal in a swing and semi-automatic fashion, in which the retainer means has a transition point at an angle other than 90° to provide a structural stability.

[Background Art]

Korean Patent Application No. 2004-48684, which has been filed by the present applicant, discloses a display-swing apparatus for communications terminals.

In this swing mechanism, the crystal liquid screen of the display unit can be tilted into a horizontal landscape form to allow a user to watch a movie or the like in a normal size and orientation.

However, the above structure is configured to tilt or rotate the display unit in one direction only.

If users are not used to tilt or rotate the display unit in the designed direction, they suffer from inconvenience of having to confirm the rotatable or tiltable direction every time they try to tilt the display unit.

Therefore, if the display unit is rotated or tilted in either direction, the users can be provided with a further convenience. In addition, if the display unit is configured to tilt or rotate in both directions and simultaneously slidably opened and closed, the user will be able to have a feeling of further satisfaction.

Furthermore, as the tilting mechanism for rotating the display unit becomes slimmer, the portable terminal can become slimmer as much. On the other hand, as an example of display-tilting mechanisms, Korean Patent

Application No. 10-2003-13033 discloses an apparatus for opening and closing a communications device.

In a portable terminal having the above opening and closing apparatus, when the display unit is opened 90°, it passes a transition point. That is, in order that a user opens the display unit completely, he or she must push it up to 90° and after that the display unit is automatically opened. Further, in order to close the display unit, similarly, the display unit must be pushed up to 90° for automatic closing operation.

However, users of communications terminals tend to want a fast opening operation of the display unit, even through the closing operation thereof may be a little bit slow or inconvenient. For example, the tilting or rotating mechanism may be designed such that after a user opens, rotates or tilts the display unit as much as about

30°, the display unit can be opened automatically up to 180°.

[Disclosure] [Technical Solution]

In order to accomplish the above objects, according to one aspect of the invention, there is provided a display-titling apparatus of a communications terminal, in which a display unit is combined to a support portion of the communications terminal, the support portion being hinged to the main body of the communications terminal; the apparatus comprising: a first fixed portion fixed to the support portion and having a central shaft portion; a rotating portion combined with the display unit and rotatably coupled to the central shaft portion; a second fixed portion combined to the first fixed portion while covering the rotating portion, the second fixed portion having a first through-hole to expose part of the rotating portion in order for the rotating portion to be coupled to the display unit; a cam formed in either the first fixed portion or the rotating portion at a radial position from the rotation center thereof, the can having a protrusion at a certain angular position from a reference position; a spring unit installed in either the first fixed portion or the rotating portion wherever the cam is not formed, the cam exerting a desired spring force to the cam under states where the rotating portion is not rotated and rotated by a certain angle respectively, thereby providing a certain retaining force; and a retainer unit for retaining the rotating portion at a position where the rotating portion is rotated by a certain angle with respect to the first fixed portion.

According to another aspect of the invention, there is provided an apparatus for tilting a display unit in a communications terminal having a display unit and a main body, the apparatus comprising; a rotation member fixed to the display unit, the rotation member having a central shaft; a first slider member rotatably combined with the central shaft and having a cam; a cover combined with the first slider member in a way to wrap around the rotation member, the cover having an opening through which part of the rotation member is exposed; a pusher member installed between the rotation member and the first slider member and pushing the cam to generate a desired retaining force when the rotation member is not rotated and rotated by a certain angle respectively; a retainer member for preventing the rotation member from further rotating from a state rotated by a certain angle; a second slider member fixed to the main body and slidably combined with the first slider member, the second slider member having one or more slant faces, the slant face having a transition point where the inclination direction is reversed; a resilient member generating an elastic force perpendicularly to moving direction of the first slider member; a connector member for coupling the resilient member to the first slider member; and one or more slip member transferring the elastic force of the resilient member to the slant face such that the first and second slider members slide against each other.

According to a further aspect of the invention, there is provided a display-tilting mechanism for a communications terminal, in which a main body is hinged with a support portion with which a display unit is rotatably combined, the mechanism comprising: a first fixing unit fixed to the support portion and having a central shaft; a rotation unit coupled to the display unit and rotatably combined with the central shaft; a second fixing unit combined with the first fixing unit with the rotation unit placed in- between, the second fixing unit having a first through-hole through which the rotation unit is combined with the display unit; a cam formed in the rotation unit; and a spring unit disposed between the first fixing unit and the second fixing unit so as to exert an elastic force to the cam, wherein the cam protrudes from a side face of the rotation unit, the cam is provided at the top face thereof with a first stopper step, and a second stopper step for limiting rotation of the first stopper step is formed in the inner circumference of the first through-hole of the second fixing unit.

According to a further aspect of the invention, there is provided a display-tilting apparatus for a communications terminal, the apparatus comprising: a first cam member including a first waveform face and a second waveform face, the first waveform face having a first valley, a first ridge and a second valley formed one after another in a certain range of circular area, the second waveform face being concentric and symmetrical with the first waveform face and having a different radius from the first waveform face, the second waveform face having a third valley, a second ridge and the fourth valley formed one after another correspondingly to the first valley, the first ridge and the second valley respectively; a second cam member including a first protrusion contacting the first waveform face and a second protrusion contacting the second waveform face; a spring means for allowing the first and second cam member to be in close contact with each other; and a shaft member for aligning the first and second cam members on an axis.

[ Description of Drawings ]

Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which:

Fig. 1 is an exploded perspective view of a communications terminal according to the first embodiment of the invention;

Figs. 2 and 3 are exploded perspective views of the display tilting apparatus shown in Fig. 1 ;

Fig. 4 is a plan view showing a connection between the cam and the slider block in Fig. 2; Fig. 5 is a plan view showing a connection between the rotating portion and the second fixed portion in Fig. 2;

Fig. 6 is a cross sectional view showing the display tilting apparatus when in the initial un-tilted state thereof;

Fig. 7 is a cross sectional view showing the display tilting apparatus when the rotating portion is partially rotated;

Figs. 8 to 10 are perspective views showing the communications terminal of Fig. 1 when in use;

Figs. 11 and 12 are exploded views of a display-tilting and slidable-shutter mechanism according to the second embodiment of the invention;

Figs. 13 and 14 are exploded views of the display-tilting apparatus in Figs. 11 and 12;

Fig. 15 is a perspective view of the communications terminal of Fig. 11;

Fig. 16 is a perspective view of the communications terminal where the display unit is tilted;

Fig. 17 is a sectional view showing the tilting mechanism of Fig. 11 before tilting the display unit;

Figs. 18 and 19 are sectional view showing the tilting mechanism of Fig. 11 after tilting the display unit;

Fig. 20 is an exploded perspective view of the slidable shutter apparatus shown in Fig. 11; Fig. 21 is a plan view showing a closed state of the slidable shutter apparatus of

Fig. 20;

Fig. 22 is a plan view showing the slidable shutter apparatus of Fig. 20, being moved into the open position;

Fig. 23 shows an open state of the slidable shutter apparatus of Fig. 20; Fig. 24 is a perspective view showing an open state of the slidable shutter apparatus of Fig. 20;

Fig. 25 is a perspective view of a both- way tilting and slidable shutter apparatus of communications terminal, according to the third embodiment of the invention;

Fig. 26 schematically shows the communications terminal of Fig. 25 when slidably opened up;

Fig. 27 schematically shows the communications terminal of Fig. 25 when slidably opened up and tilted in either direction;

Fig. 28 is an exploded perspective view of a both-way tilting and slidable shutter apparatus for communications terminal, according to the fourth embodiment of the invention; Fig. 29 schematically shows the communications terminal of Fig. 28 when slidably opened up;

Fig. 30 schematically shows the communications terminal of Fig. 28 when slidably opened up and tilted in either direction;

Fig. 31 is a perspective view of a display-titling apparatus according to the fifth embodiment of the invention;

Fig. 32 is an exploded perspective view of the apparatus of Fig. 31 ;

Fig. 33 explains the operations of the display-tilting mechanism of Fig. 31;

Fig. 34 is a perspective view of a display-tilting apparatus according to the sixth embodiment of the invention; Fig. 35 is an exploded perspective view of the display-tilting apparatus of Fig.

34;

Fig. 36 shows the operation of the display-tilting apparatus of Fig. 34;

Fig. 37 is an exploded perspective view showing a display-tilting apparatus according to the seventh embodiment of the invention; Fig. 38 shows the operation of the display-tilting apparatus of Fig. 37;

Fig. 39 is a perspective view of a display tilting apparatus for a communications terminal, according to the eighth embodiment of the invention;

Fig. 40 is an exploded perspective view of the apparatus of Fig. 39;

Fig. 41 is an elevation of the display-tilting mechanism shown in Fig. 39; Fig. 42 shows the operations of the display-tilting apparatus of Fig. 39;

Figs. 43 and 44 are exploded perspective views of a display-tilting apparatus according to the ninth embodiment of the invention;

Fig. 45 is a perspective view showing major portions of the apparatus of Fig. 43;

Fig. 46 is a perspective view showing an assembled state of the apparatus of Fig. 43;

Fig. 47 is a cross-sectional view of the apparatus of Fig. 46;

Fig. 48 is a partial exploded perspective view of the apparatus shown in Fig. 46;

Fig. 49 shows the apparatus of Fig. 48 where the display unit is rotated until the transition point; Fig. 50 shows the apparatus of Fig. 48 where the display unit has completed its rotation;

Figs. 51 and 52 are exploded perspective views of a display-tilting apparatus according to the tenth embodiment of the invention;

Fig. 53 is a perspective view showing an assembled state of the apparatus of Fig. 51;

Fig. 54 is a perspective view showing a first cam member and a second cam member in the apparatus of Fig. 51;

Fig. 55 is a perspective view showing an assembled sated of a stopper, a stopper and a housing in the apparatus of Fig. 51; and Fig. 56 shows operations of the apparatus of Fig. 51.

[Mode for Invention]

Hereafter, exemplary embodiments according to the invention will be explained with reference to the accompanying drawings. Fig. 1 is an exploded perspective view of a communications terminal according to the first embodiment of the invention. Figs. 2 and 3 are exploded perspective views of the display tilting apparatus of Fig. 1. Fig. 4 is a plan view showing a connection between the cam and the slider block in Fig. 2. Fig. 5 is a plan view showing a connection between the rotating portion and the second fixed portion in Fig. 2. Fig. 6 is a cross sectional view showing the display tilting apparatus when in the initial un- tilted state thereof.

The communications terminal includes a first fixed portion 200, a rotating portion 300, a second fixed portion 250, a cam 310, a spring unit, and a retainer unit. The first fixed portion 200 is fixed to a support portion 110 and has a central shaft portion 210. The rotating portion 300 is combined with a display unit 130 and rotatably coupled to the central shaft portion 210. The second fixed portion 250 is connected to the first fixed portion 200 while covering the rotating portion 300. The second fixed portion 250 has a first through-hole 252 through which the rotating portion is partially exposed and connected with the display unit 130. The cam 310 is formed at a radial position spaced apart from the rotation center of the rotating portion 300 and includes protrusions at certain angular positions spaced from a reference position. The spring unit is installed in the first fixed portion 200. At the respective states where the rotating portion 300 is not rotated and rotated by a certain angle, the spring unit exerts a spring force to the cam 310 to thereby generate a certain retaining force. At the state where the rotating portion 300 is rotated by a certain angle against the first fixed portion, the retainer unit is configured to prevent the rotating portion 300 from further rotating.

The central shaft portion 210 is provided at its center with a central hole 212, through which a signal line passes from the support portion 110 towards the display unit 130. The rotating portion 300 is provided with a guide hole 322 through which the central shaft portion 210 passes. The cam 310 is provided with protrusions 312 at angular intervals of 90 degrees, and the spring unit is installed at 90 degrees intervals. The spring unit is made up of a slider block 410 and a spring 420 for exerting a spring force to the slider block 410. The slider block 410 is movably installed in the first fixed portion 200 and contacts the cam 310 to restrict rotation of the protrusion 312.

The first fixed portion 200 is provided with a guide groove 230 for guiding movement of the slider block 410.

The retainer unit is comprised of a first stopper step 324 formed in the rotating portion 300 and a second stopper step 254 formed in the second fixed portion 250 so as to prevent the first stopper step 324 from further rotating beyond a certain angular limit, i.e., so as to rotate within a certain angular range. The rotating portion 300 can rotate in both directions and the second stopper step 254 is formed at two positions.

Interposed between the first fixed portion 200 and the rotating portion 300 is a cover 430 for preventing release of the slider block 410 and the spring 420 and also reducing friction between the slider block 410 and the rotating portion 300. The cover 430 is provided with a second through-hole 432 formed to allow the cam 310 to pass through.

On the other hand, the control unit in the main body 100 needs a function of controlling image signals output to the liquid crystal screen 132 so as to be displayed in a normal state, even when the display unit 130 is rotated. Hereafter, the operation of the first embodiment will be explained.

Fig. 7 is a cross sectional view showing the display tilting apparatus when the rotating portion is partially rotated. Figs. 8 to 10 are perspective views showing the communications terminal of Fig. 1 when in use.

As shown in Fig. 8, at its normal state, the display unit 130 of the communications terminal is combined with the support portion 110 and closed to the main body 100 in the vertical direction, i.e., in the portrait form. At this state, the slider block 410 is pressed against between the protrusions of cam 310 by means of the resiliency of the spring 420 such that the rotating portion 300 and the display unit 130 remains in the portrait form.

As shown in Fig. 9, if a user lifts up the display unit 130, the support portion 110 pivots about a hinge 12 to open the display unit 130.

More specifically, if the display unit 130 is tilted in either direction, the rotating portion 130 is rotated about the central shaft portion 210, together with the display unit 130, as shown in Fig. 7. During this course of action, the slider block 410 is pushed back against the elastic spring 420 by means of the protrusions 312, and thereafter pushes the protrusions 312 in the opposite direction by the spring, so that the rotating portion 300 and the display unit 130 reach a tilted position and remain in the 90°-tilted state.

Then, if the rotating portion rotates about the central shaft portion 210 by 90- degree in either direction, the first stopper step 324 formed in the rotating portion 300 and the second stopper step 254 formed in the second fixed portion 250 contact each other to prevent further rotation of the rotating portion 300. Hence, the display unit 130 and the rotating portion 300 are configured to rotate and tilt within 90-degree in both directions.

If the display unit 130 tilts 90°, the liquid crystal screen 132 of the display unit 130 is placed in a landscape form, i.e., the lengthwise direction thereof is aligned with the horizontal direction. At this state, the liquid crystal screen 132 can display a movie and the like in a normal orientation and size.

The operation for restoring the display unit 130 into the initial state is performed in reverse orders to the above procedures. Hereafter, according to the second embodiment of the invention, a display- tilting and sliding-shutter mechanism will be explained, with reference to the accompanying drawings.

Figs. 11 and 12 are exploded views of a display-tilting and slidable-shutter mechanism according to the second embodiment of the invention. Figs. 13 and 14 are exploded views of the display-tilting apparatus in Figs. 11 and 12. As illustrated in Figs. 11 to 14, the display-tilting and slidable-shutter mechanism of communications terminals is generally comprised of a both-way tilting apparatus and a slidable-shutter apparatus.

First, a both-way tilting mechanism will be explained as follows.

The both-way tilting mechanism of a communications terminal includes a rotation member 1100 having a central shaft 1110. A first slider member 1200 is rotatably combined to the central shaft 110, and includes a cam 1210 formed at a radial position outwards of the rotation center of the central shaft 1110. The cam 1210 has a protrusion 1212 formed at angular positions spaced apart from a reference position. A cover 1300 is combined with the first slider member 1200 while covering the rotation member 1100. The cover 1300 has an opening through which part of the rotation member 1100 is exposed. A pusher member 1400 is disposed between the rotation member 1100 and the first slider member 1200. The pusher member 1400 pushes the cam 1210 to retain the first slider member 1200 at the states where it is not rotated and rotated by a certain angle respectively. A retainer member is provided for holding the slider member 1200 in place at the rotated state by a certain angle with respect to the rotation member 1100.

More specifically, referring to Figs. 13 and 14, the rotation member 1100 is fixed to display unit (not shown) of a communications terminal. A central shaft is formed at the center of the rotation member 1100. The central shaft is provided with a central hole 1112 through which signal lines leading to the display unit from the main body pass. A guide hole 1120 is formed in a radial direction outwards of the central shaft 1110, so as to guide the straight movement of a slider block, which will be explained hereinafter.

The first slider member 1200 is rotatably combined to the central shaft 1110.

The cam 1210 is formed at one side of the first slider member 1200. The cam 1210 is formed in a radial direction from the rotation center, and provided with protrusions

1212 formed at angular positions spaced apart from a reference position. The protrusions are formed at angular intervals of 90°. Formed at the center of the cam

1210 is a central shaft insertion hole 1214, through which the central shaft 1110 is inserted. The cover 1300 is combined to the slider member 1200 in a way to wrap around the rotation member 1100. The central area of the cover 1300 is opened such that part of the rotation member 1100 can be combined to the display unit.

The pusher member 1400 pushes the cam 1210 for the rotation member 1100 to remain at the non-rotated state and rotated state by certain specified degrees of angle. The pusher member 1400 includes a slider block 1410 and a spring 1420 for pressing the slider block 1410. The slider block 1410 is guided by the guide hole 1120 so as to perform a linear straight movement.

The slider block 1410 is installed in a way that it is inserted into the slider block guide hole 1120 and contacts the cam 1210. The slider block 1410 is provided with a protrusion 1420 formed at both sides to the opposite of the contact with the cam 1210.

The spring 1420 is inserted onto the protrusion 1420. The spring 1420 resiliently supports the slider block 1410 so as to be capable of pushing the cam 1210 with a desired pressure.

The retainer member restricts the rotation member 1100 (combined with the display unit) not to further rotate beyond a certain specified angular rotation. The retainer member includes a stopper protrusion 1114 formed in the central shaft 1110 and a stopper step formed in the central shaft insertion hole 1214 of the cam 1210.

The stopper protrusion 1114 is formed at the free end of the central shaft 1110 in a way to protrude in the lengthwise direction of the central shaft 1110.

The stopper step 1216 is formed at two locations in the central shaft insertion hole 1214 and configured such that during both- way rotation of the rotation member

1100, it is stopped by the stopper protrusion 1114 not to further rotate beyond a certain specified angle, i.e., to rotate within a certain specified range of angle. For example, the stopper protrusion 114 is formed at 12 o'clock of the central shaft 1110 and the stopper step is formed at 3 o'clock and 9 o'clock respectively of the central shaft insertion hole 1214. Therefore, when the rotation member 1100 rotates counter clockwise, the 12 o'clock stopper protrusion is made to contact the 3 o'clock stopper step 1216. On the contrary, when the rotation member 1100 rotates clockwise, the 12 o'clock stopper protrusion is made to contact the 9 o'clock stopper step 1216.

The operation of the above-constructed both-way tilting mechanism will be explained in detail.

Fig. 15 is a perspective view of the communications terminal of Fig. 11. Fig.

16 is a perspective view of the communications terminal where the display unit is tilted.

Fig. 17 is a sectional view showing the tilting mechanism of Fig. 11 before tilting the display unit. Figs. 18 and 19 are sectional view showing the tilting mechanism of Fig. 11 after tilting the display unit.

At the normal state, as shown in Fig. 15, the display unit D is closed onto the main body B in a portrait fashion.

If a use tilts the display unit D in either direction, the rotation member 1100 connected to the display unit D rotates about the central shaft 1110 such that the display is tilted as shown in Fig. 16.

More specifically, as illustrated in Fig. 17, the slider block 1410 resiliently biased by the spring 1420 pushes between of the protrusions 1212 of the cam 1210 with a desired elastic force, so that the display unit D remains in the portrait orientation and in the closed state. When a user rotates the display unit D in either direction, the rotation member 1100, along with the display unit D, rotates about the central shaft 1110 as shown in Fig. 18. During this course of action, each slider block 1410 is resiliently pushed back by the spring 1420 and the protrusion 1212 of the cam 1210. After that, as shown in Fig. 19, the spring 1420 pushes back the cam 1210 to allow the display unit D to remain in the tilted and open state.

As shown in Figs. 17 to 19, if the rotation member 1100 rotates about the central shaft 1110 in either direction by 90°, the stopper step 1216 formed in the first slider member 1200 is contacted with the stopper protrusion 1114 formed in the central shaft 1110 such that the rotation member 1100 can not further rotate.

Thus, the display unit D and the rotation member 1100 can be rotated in either direction within an angular range of 90°. When the display unit D rotates 90° in either direction, the liquid crystal screen of the display unit D is made to take a landscape form. At this state, movies and the like can be displayed or presented in the normal orientation and size.

The display unit D can be restored into the initial orientation in the reverse order of the above operations. Hereafter, the construction of a slidable opening and closing mechanism, in other words, a slidable shutter mechanism is explained.

The slidable shutter mechanism is configured to slidably open and close the display unit against the main body. The shutter mechanism includes a second slider member 1500 fixed to the main body and slidably combined with the first slider member 1200. The second slider member 1500 is formed with at least one slant face, at the central area of which a transition point 1520a is formed. The inclination direction of the slant face 1520 is reversed at the transition point 1520a. A resilient member is provided to generate an elastic force perpendicularly to the movement of the first slider member 1200. The resilient member is fixed to the first slider member 1200 by means of a connector member. The shutter mechanism includes a slip member receiving the elastic force from the resilient member and transferring it to the slant face 1520 such that the first slider member 1200 can slide against the second slider member 1500.

Referring to Figs. 11, 12 and 20, further details will be described.

The second slider member 1500 is fixed to the main body of a communications terminal (not shown) and is linearly slidable against the first slider member 1200. One or more guide rods 1510 are fixed to the second slider member 1500, and a guide hole 1220 is formed in the first slider member 1200. The guide rod and hole are slidably combined to each other, and consequently the first and second slider members 1200 and 1500 are slidably combined to each other. Formed at both sides of the upper and lower ends of the second slider member 1500 is an insert hole 1512, into which both ends of the guide rod 1510 are inserted to be combined to each other.

The slant face 1520 is formed symmetrically in pairs in the second slider member 1500. The distance between the two slant faces is minimized at the transition point 1520a. In addition, the connector member and the slip member are provided in pairs at the symmetrical positions respectively.

The connector member is made up of one or more links 1700, one end of which is shaft-supported on the first slider member 1200 and the other end of which is shaft- supported on the end portion of the resilient member which is therefore supported on the first slider member 1200. Each link 1700 is rotatably installed in the first slider member 1200 by means of a first central shaft 1710. The first central shaft 1710 is the rotational center of the link 1700. In order to install a torsion spring 1600, the end portions of the torsion spring

1600 are bent to form a hook 1610. Each link 1700 is formed with a protrusion 1720 to which the hook 1610 is coupled. Each protrusion 1720 is coupled with the respective hooks 1610 such that each end of the torsion spring 1600 is pivotably coupled to the link 1700.

The slip member is formed of a roller 1800, which is shaft-supported so as to be capable of rolling on the slant face of the second slider member 1500. The roller 1800 is installed in the link 1700 so as to enable to rotate about a second central shaft 1730. The roller 1800 rolls on the slant face 1520 to minimize friction force. When the roller 1800 is placed on the slant face 1520 towards the closing direction from the transition point 1520a, it causes the second slider member 1500 to be biased towards the closed position. When the roller 1800 is placed on the slant face towards the opening direction from the transition point 1520a, the second slider member 1500 is forced towards the open position thereof. A first retainer groove 1522 and a second retainer groove 1524 are formed in both ends of the slant face 1520 in order to generate a retaining force when the second slider member 1500 is placed in the open and closed position respectively.

The above communications terminal establishes a function in the main board of the main body B such that, when the display unit D is opened, the liquid crystal screen is turned on, and when the display unit D is closed, the liquid crystal screen is turned off.

Hereafter, the operation of the above-structured slidable shutter mechanism will be explained.

Fig. 20 is an exploded perspective view of the slidable shutter apparatus shown in Fig. 11. Fig. 21 is a plan view showing a closed state of the slidable shutter apparatus of Fig. 20. Fig. 22 is a plan view showing the slidable shutter apparatus of

Fig. 20, being moved into the open position. Fig. 23 shows an open state of the slidable shutter apparatus of Fig. 20. Fig. 24 is a perspective view showing an open state of the slidable shutter apparatus of Fig. 20.

First, as shown in Fig. 21, at the closed state, the first slider member combined to the display unit D remains pushed into one end of the second slider member 1500. At this time, the elastic force of the torsion spring 1600, supported on the first slider member 1200, is transferred to the roller 1800 through the link 1700. The roller

1800 is retained in the first retainer groove 1522 to prevent free movement of the first slider member 1200.

At this state, if a user pushes up the display unit D, the display unit D and the first slider member 1200 slides upwards in Fig. 21. Here, since the first and second slider members 1200 and 1500 are combined with each other through a guide rod 1510, the first slider member 1200 performs a smooth linear motion.

If the first slider member 1200 starts to open, the two rollers 1800 are released from the first retainer groove 1522 and roll on the both slant faces 1520. At the beginning, since the distance between the slant faces becomes narrower, the roller 1800 compresses the link 1700 and the torsion spring 1600. During this course of action, a certain resistance occurs, and thus the user must push up and move upwards the display unit D until the roller 1800 reaches the transition point 1520a.

As shown in Fig. 22, if the roller 1800 passes beyond the transition point 1520a, the distance between the slant faces 1520 becomes broader. Thus, the torsion spring

1600 expands. During this course of action, the expansion force of the torsion spring

1600 acts as an opening force of the first slider member 1200 via the roller 1800.

Therefore, after the transition point 1520a, the first slider member 1200 automatically moves up to the open position, without having to further push up the display unit D. When the display unit D and the first slider member 1200 are completely opened, as shown in Fig. 23, the roller 1800 is again engaged into the second retainer groove 1524 to generate a desired retaining force for preventing free movement of the slider member.

Thus, the first slider member 1200 remains at the opened state.

As shown in Fig. 24, if the display unit D is opened, the keypad of the main body B is opened and the liquid crystal screen is turned on according to a pre- established function. Thus, a user can use the terminal's inherent functions.

On the other hand, in order to close the terminal from the open state, the user pulls down the display unit D in opposite direction to when opened. The closing operation is carried out in reverse order of the opening operations. As described above, the communications terminal can be tilted in either direction, and simultaneously slidably opened and closed according to the invention.

Fig. 25 is a perspective view of a both- way tilting and slidable shutter apparatus of communications terminal, according to the third embodiment of the invention.

As shown in Fig. 25, the apparatus of third embodiment has a similar structure to the second embodiment, except for the retainer member thereof. In this embodiment, the retainer member includes a pair of guide rivets 1910 mounted in the rotation member 1100. A curved through-opening 1920 is formed in the first slider member 1200 for the guide rivets 1910 to pass through. A straight guide groove 1930 is formed in the second slider member 1500 such that the free end of the guide rivet 1910 rests in the straight guide groove and guides the straight movement of the guide rivet 1910. A curved guide groove 1940 is connected with the straight guide groove

1930. The curved guide groove guides and restricts both- way tilting motion of the guide rivet 1910.

Hereafter, the third embodiment of the invention will be described more specifically.

The guide rivet 1910 is provided in one pair spaced apart from each other by a desired distance and fixed to the rotation member 110 so as to protrude with a desired height.

The curved through-opening 1920 formed in the first slider member 1200 has a circular form such that the guide rivet 1910 is not interrupted when the rotation member 1100 tilts in either direction.

The straight guide groove 1930 is formed in pairs in the second slider member 1500 so as to have a desired depth. The free end of the guide rivet 1910, which has passed through the curved through-opening 1920, rests on the straight guide groove 1930. The curved guide groove 1940 is formed in the second slider member 1500 in order to restrict rotation of the rotation member 1100 to within a certain angular range. The curved guide groove 1940 has the same configuration as the curved through- opening 1920 and is connected with the straight guide groove 1930.

The operation of the above third embodiment of the invention will be explained hereafter.

Fig. 26 schematically shows the communications terminal of Fig. 25 when slidably opened up. Fig. 27 schematically shows the communications terminal of Fig. 25 when slidably opened up and tilted in either direction.

In order to watch movies or the like in a normal orientation and size on the liquid crystal screen of the display unit, a user slides upwards and then tilts the display unit in either direction.

Hereafter, this operation is described in detail.

First, if the display unit D slidably moves, the rotation member 1100 fixed to the display unit D and the guide rivet 1910 fixed to the rotation member 1100 move along with the display unit D. At this time, the free end of the guide rivet 1910 moves along the straight guide groove 1930 of the second slider member 1500 and is positioned as shown in Fig. 26. Then, if the display unit D is tilted counterclockwise 90°, the rotation member 1100 fixed to the display unit D and the pair of guide rivets 1910 fixed to the rotation member 1100 are rotated along the curved guide groove 1940 of the second slider member 1500 and come to contact the end of the curved guide groove 1940 as shown in Fig. 27. Here, since the curved guide groove 1940 of the second slider member 1500 is aligned with the curved through-opening 1920, the guide rivet 1910 can freely rotate without resistance. In addition, even through a user tries to rotate beyond 90°, the guide rivet 1910 contacts the end of the curved guide groove 1940 to prevent any further rotation of the display unit D. Fig. 28 is an exploded perspective view of a both-way tilting and slidable shutter apparatus for communications terminal, according to the fourth embodiment of the invention.

As shown in Fig. 28, the apparatus of fourth embodiment has a similar structure to the second embodiment, except for the retainer member thereof. In this embodiment, the retainer member includes a seesaw guide 11010 fixed to the second slider member 1500 and a seesaw 11020 combined to the seesaw guide so as to enable to perform seesaw-movement. A seesaw rivet 11022 protrudes in one side of the seesaw and a presser plate 11024 inclined to one side is formed in the other side of the seesaw. A pusher plate 11040 is formed in the first slider member 1200 to push the presser plate 11024 for the seesaw 11020 to perform seesaw-motion. Formed in the second slider member 1500 is a seesaw rivet through-hole 11050, through which the seesaw rivet 11020 passes to protrude when in seesaw-movement of the seesaw 11020. A seesaw spring 11030 is provided between the seesaw guide 11010 and the seesaw 11020 to thereby resiliently support the seesaw 11020. A semi-circular retainer groove 11060 is formed in one side face of the display unit D.

More specifically, the seesaw guide 11010 is for installing the seesaw 11020 in the second slider member 1500, and both sides of the seesaw guide 11010 are fixed to an upper side of the second slider member 1500.

The seesaw 11020 carries out seesaw-motion by means of the seesaw guide 11010. The seesaw guide 11010 and the seesaw 11020 are hinged to each other. A seesaw rivet 11022 is formed in one side of the seesaw 11020 and a presser plate 11024 is formed in the other side of the seesaw 11020 so as to be inclined towards one side.

The seesaw spring 11030 resiliently support the seesaw 11020 and is installed between the seesaw guide 11010 and the seesaw 11020.

The pusher plate 11040 is formed in one upper side of the first slider member 1200 so as to protrude. The protruded pusher plate 11040 pushes the presser plate 11024 of the seesaw 11020 such that the seesaw can perform seesaw-motion when the first slider member 1200 slidably moves.

The seesaw rivet through-hole 11050 is formed in the second slider member 1500 such that the seesaw rivet 11022 formed in one side of the seesaw 11020 passes through the through-hole 11050 and protrudes as the seesaw 11020 carries out seesaw- motion.

The retainer groove 11060 is formed in one side of the display unit D in a semicircular shape, such that it contacts the protruded seesaw rivet 11022 to limit the tilting of the display unit D within a certain angular range. The operation of the fourth embodiment is as follows.

Fig. 29 schematically shows the communications terminal of Fig. 28 when slidably opened up. Fig. 30 schematically shows the communications terminal of Fig. 28 when slidably opened up and tilted in either direction.

In order to watch movies or the like in a normal orientation and size on the liquid crystal screen of the display unit, a user slides upwards and then tilts the display unit in either direction. Hereafter, this operation is described in detail.

First, as shown in Fig. 29, when the display unit D slidably moves, the pusher plate 11040 protruded in one side of the upper portion of the first slider member 1200 slidably moves to contact and then push the presser plate 11024 of the seesaw 11020. If the pusher plate 11040 pushes the presser plate 11024 of the seesaw 11020, the seesaw and seesaw guide hinged to each other performs seesaw-movement on the hinge such that the seesaw rivet 11022 placed at the opposite to the presser plate 11024 of the seesaw 11020 rotates. At this time, the seesaw spring 11030 installed between the seesaw 11020 and the seesaw guide 11010 is compressed. Then, the seesaw rivet 11022 rotates and protrudes through the seesaw rivet through-hole 11050 of the second slider member 1500. Thereafter, as shown in Fig. 30, if the user rotates the display unit D counterclockwise by 90°, the retainer groove 11060 formed in one face of the display unit D rotates and one end of the semi-circular groove 11060 contacts the seesaw rivet 11022 protruded through the seesaw rivet through-hole 11050 of the second slider member 1500. Even though the user tries to further rotate the display unit D beyond the 90°, the seesaw rivet 11022 contacts the end of the retainer groove 11060 not to allow further rotation of the display unit D.

In addition, with the display unit D rotated by 90° in either direction, if a user tries to forcibly slide the display unit D, the protruded seesaw rivet 11022 contacts the sidewall of the retainer groove 11060 and thus the sliding movement is not allowed.

Therefore, in order to close the display unit D, the user rotates the display unit D in reverse direction to be aligned with the main body and then pulls down the display unit D. Thus, the pusher plate 11040 of the first slider member 1200 is released from the presser plate 11024. Due to the restoring force of the spring compressed between the seesaw 11020 and the seesaw guide 11010, the seesaw 11020 turns about the hinge so that the seesaw rivet 11022 is pulled out from the seesaw rivet through-hole 1050. Then, the display unit D is allowed to smoothly slide.

Hereafter, the fifth embodiment of the invention will be explained in detail with reference to the accompanying drawings.

Fig. 31 is a perspective view of a display-titling apparatus according to the fifth embodiment of the invention. Fig. 32 is an exploded perspective view of the apparatus of Fig. 31 and Fig. 33 explains the operations of the display-tilting mechanism of Fig. 31.

In this embodiment, the main body of a communications terminal is hinged to a support portion, with which the display unit is tiltably combined. As shown in Figs. 31 to 33, the display titling mechanism according to this embodiment is comprised of a first fixing unit 2100, a rotation unit 2200, a second fixing unit 2300, a cam 2220 and a spring unit 2400.

The first fixing unit 2100 is fixed to the support portion and provided with a central hollow shaft 2111 protruded at its central portion, as shown in Fig. 32. The rotation unit 2200 is combined with the display unit and is provided at its central area with a rotation hole 2210, into which the central shaft 2110 is rotatably inserted.

The second fixing unit 2300 is combined with the first fixing unit 2100 using a bolt or the like, with having the rotation unit 2200 in-between. The second fixing unit 2300 is provided with a first through-hole 2310, through which the rotation unit 2200 is combined with the display unit.

Therefore, the rotation unit 2200 is made to be combined with the display unit through the first through-hole 2310.

Here, of course, the diameter of the first through-hole 2310 is larger than that of the rotation unit 2200 to provide a smooth rotation of the rotation unit.

The cam 2220 is integrally formed with the rotation unit 2200 in a way to protrude in parallel with the rotation unit along the circumference thereof.

That is, the cam 2220 protrudes in parallel from the edge of the rotation unit 2200 such that the rotation unit 2200 is prevented from being escaped through the first through-hole 2310 of the second fixing unit 2300, as shown in Fig. 31. As shown in Fig. 32 and 33, the cam 2220 is provided with a concave rest groove 2230 formed at 90° intervals.

The rest groove 2230 may be formed at different angular intervals.

At this time, preferably, a virtual circle along the outer circumference of the cam 2220 is concentric with the rotation unit 2200. A first stopper step 2225 protrudes from the cam 2220, and a second stopper step 2320 for limiting rotation of the first stopper step 2225 is formed at both side of the first through-hole 2310 of the second fixing unit 2300, as shown in Fig. 32.

The spring unit 2400 is installed between the first and second fixing units 2100 and 2300 to exert an elastic force to the cam so as to limit rotation thereof. The spring unit 2400 is made up of a slider 2420 slidably mounted, and a spring 2430 for exerting an elastic force to the slider 2420.

At this time, the slider 2420 is provided at its front side with a protrusion 2425 to be rested onto the rest groove 2230, and at its rear side the spring 2430 is disposed at both sides in pairs. As described above, since the protrusion 2425 is engaged into the rest groove

2230, the cam 2220 can be held in place by means of the protrusion 2425, so that the cam 2220 and the rotation unit 2200 are prevented from being arbitrarily rotated or wobbling.

The spring unit 2400 is mounted preferably at a single location in the first fixing unit to thereby minimize the overall size of the display-tilting mechanism.

Hereafter, the operation of the above fifth embodiment will be described in detail.

Figs. 33(a) to 33(c) show the rotation unit 2200 tilted -90°, 0° and +90° respectively.

First, if the display unit is tilted from the state of Fig. 33(b), the rotation unit 2200 rotates and thus the cam 2220 integrally formed with the rotation unit 2200 rotates.

By the rotation of the cam 2220, the protrusion 2425 of the slider 2420 rested on the rest groove 2230 is pushed backward while compressing the spring 2430.

When the display unit is tilted by 90° or -90°, the slider 2420 moves forwards by the elastic force of the spring 2430 and thus the protrusion 2425 is engaged again with the rest groove 2230 different from the previous one.

At this time, since the protrusion 2425 rests onto the rest groove 2230, the rotation unit 220 can be held in place, without arbitrarily rotating or wobbling.

In addition, when the rotation unit 2200 is rotated by -90° as shown in Fig. 33(a) or by +90° as shown in Fig. 33(c), the first stopper step 2225 is latched with the second stopper step 2320 to prevent any further rotation of the rotation unit 2200.

Therefore, the user can tilt the rotation unit 2200 by 90° in either direction to tilt the display unit fixed to the rotation unit 2200 into landscape orientation, i.e., in a horizontal direction.

Hereafter, the sixth embodiment of the invention will be explained with reference to the accompanying drawings.

Fig. 34 is a perspective view of a display-tilting apparatus according to the sixth embodiment of the invention. Fig. 35 is an exploded perspective view of the display- tilting apparatus of Fig. 34. Fig. 36 shows the operation of the display-tilting apparatus of Fig. 34. Referring to Figs. 34 to 36, the display-tilting apparatus of sixth embodiment is to rotatably or tiltably combine the display unit to a support portion, which is hinged to the main body of a communications terminal. The apparatus includes a first fixing unit 3100, a rotation unit 3200, a second fixing unit 3300, a cam 3220 and a spring unit 3400.

The first fixing unit 3100 is fixed to the support portion, and as shown in Fig. 35, is provided at its central area with a hollow central shaft 3110. The rotation unit 3200 is combined with the display unit, and is provided at its central area with a rotation hole 3210, into which the central shaft 3110 is rotatably inserted, as shown in Fig. 35.

The second fixing unit 3300 is combined with the first fixing unit 3100 using a bolt or the like, with having the rotation unit 3200 in-between. The second fixing unit 3300 is provided with a first through-hole 3310, through which the rotation unit 3200 is combined with the display unit.

Therefore, the rotation unit 3200 is made to be combined with the display unit through the first through-hole 3310.

Here, of course, the diameter of the first through-hole 3310 is larger than that of the rotation unit 3200 to provide a smooth rotation of the rotation unit.

The cam 3220 is integrally formed with the rotation unit 3200 in a way to protrude in parallel with the rotation unit along the circumference thereof.

That is, the cam 3220 protrudes in parallel from the edge of the rotation unit 3200 such that the rotation unit 3200 is prevented from being escaped through the first through-hole 3310 of the second fixing unit 2300, as shown in Fig. 34.

As shown in Figs. 35, 36a and 36b, the cam 3220 is formed at 90° intervals along the outer circumference of the rotation unit 3200, i.e., in a way to protrude in 4 different directions. A rest portion 3230 is formed between the cams 3220.

The cam 3220 may be formed at different angular intervals, when necessary. The cam 3220 protrudes from the outer circumference of the rotation unit 3200 in such a way that the protruded height thereof gradually increase towards the center portion of the cam 3220.

That is, the radius of a circle formed along the outer circumference is made smaller than that of the rotation unit 3200.

The rest portion 3230 may be formed concavely in the cam 3220, but preferably is formed automatically between the cams 3220 by giving a gap between them.

Referring to Figs. 35, 36a and 36b, the spring unit 3400 is installed between the first and second fixing units 3100 and 3300 to exert an elastic force to the cam 3220 to limit rotation of the cam 3220. The spring unit 3400 includes a movable roller 3410 contacting the cam 3220, a movable slider 3420 contacting the rear side of the roller 3410, and a spring 3430 exerting an elastic force to the slider 3420.

The roller 3410 is provided with a guide protrusion 3415 at both sides thereof. The first and second fixing units 3100 and 3300 are provided with an elongated guide hole 3120, 3320 respectively, into which the guide protrusions 3415 are inserted to guide movement of the roller 3410. At this time, preferably the elongated guide hole 3320 formed in the second fixing unit 3300 is communicatively connected with the first through-hole 3310 to enable an easy mounting of the roller 3410.

The spring 3430 is disposed at both rear sides respectively of the slider 3420. The center portion of the slider 3420, i.e., between the springs 3430 is bent rearwards to form a curved portion 3425, on which the roller 3410 rests and face-contacts.

Through the curved portion 3425, the slider 3420 and the roller 3410 make a face-contact. Thus, the elastic force of the spring 3430 can be transferred more effectively to the slider 3420 and the roller 3410, and the roller 3410 can be supported and prevented from being escaped. Hereafter, the operation of the sixth embodiment will be explained.

Fig. 36a shows the display-titling apparatus before tilting and Fig. 36b shows the display-tilting apparatus where the rotation unit is being rotated.

As shown in Fig. 36a, when the rotation unit 3200 is held in place, the roller 3410 rests on the rest portion 3230 formed between the cams 3220, by means of the elastic force of the spring 3430 and the slider 3420. At this time, since the roller 3410 rests onto and face-contacts with the curved portion of the slider 3420, the elastic force is exerted to the roller 3410 more effectively, which then presses the rest portion 3230 more strongly. The rotation unit 3200 can be held in place, without arbitrary rotation.

If a user tilts the display unit combined with the rotation unit 3200, the rotation unit 3200 rotates as shown in Fig. 36b. At this time, since the cam 3220 formed in the rotation unit 3200 is protruded from the outer surface of the rotation unit 3200, the cam 3220 pushes back the roller 3410.

Here, the roller 3410 moves along the elongated guide holes 3120 and 3320 formed in the first and second fixing units 3100 and 3300 respectively. Since the roller 3410 is in face-contact with the curved portion 3425 of the slider 3420, the roller

3420 can move in a stable manner while being supported by the curved portion 3425 of the slider 3420.

As shown in Fig. 36b, when the roller 3410 reaches the center of the cam 3220 and further moves beyond the center portion, the roller spontaneously slide down along the outer surface of the cam 3220 due to the resiliency of the spring unit 3400. Thus, again the roller 3410 comes to rest on the rest portion 3230, as shown in Fig. 36a.

Fig. 37 is an exploded perspective view showing a display-tilting apparatus according to the seventh embodiment of the invention. Fig. 38 shows the operation of the display-tilting apparatus of Fig. 37. The seventh embodiment is the same as the sixth one, except for the structure of the cam 3270. Details on the other components will not be repeated here. As in the sixth embodiment, the cam 3270 is formed so as to protrude from the outer surface of the rotation member 3200. However, dissimilar to the sixth embodiment, the cam protruded from the outer surface of the rotation unit 3200 has a uniform height and is inclined at both end portions thereof. The inclined portion of the cam 2170 is formed to has a down-slope outwards of both end of the cam.

The cam 3270 is formed at regular intervals to form a rest portion 3280 between the cams.

Hereafter, the operation of the seventh embodiment will be explained. Fig. 37a shows the display-titling apparatus before tilting and Fig. 37b shows the display-tilting apparatus where the rotation unit is being rotated.

As shown in Fig. 37a, when the rotation unit 3200 is held in place, the roller 3410 rests on the rest portion 3280 formed between the cams 3270, by means of the elastic force of the spring 3430 and the slider 3420. At this time, since the roller 3410 rests onto and face-contacts with the curved portion 3425 of the slider 3420, the elastic force is exerted to the roller 3410 more effectively, which then presses the rest portion 3280 more strongly. The rotation unit 3200 can be held in place, without arbitrary rotation.

If a user tilts the display unit combined with the rotation unit 3200, the rotation unit 3200 rotates as shown in Fig. 37b. At this time, since the cam 3270 formed in the rotation unit 3200 is protruded from the outer surface of the rotation unit 3200, the cam 3270 pushes back the roller 3410, which is rotating.

Dissimilar to the sixth embodiment, in this embodiment, the protruded cam 3270 has a uniform height. Thus, the rotation unit 3200 is to be rotated until the roller reaches the inclined portion formed at the end of the cam, in order to enter into the state of Fig. 38a again from the state of Fig. 38b.

The sixth embodiment of the invention is directed to a semi-automatic display- tilting mechanism, and the seventh embodiment of the invention is directed to a manual display-tilting mechanism. If the rotation unit 3200 is replaced with one having the cam 3220 or 3279, the semi-automatic mechanism can be converted into a manual mechanism, or vice versa.

Hereafter, the eighth embodiment of the invention will be explained, with reference to the accompanying drawings.

Fig. 39 is a perspective view of a display tilting apparatus for a communications terminal, according to the eighth embodiment of the invention. Fig. 40 is an exploded perspective view of the apparatus of Fig. 40. Fig. 41 is an elevation of the display- tilting mechanism shown in Fig. 39. Fig. 42 shows the operations of the display-tilting apparatus of Fig. 39.

The display-tilting mechanism of the eighth embodiment is to rotatably combine a display unit to a support portion, which is hinged with the main body of a communications terminal. As shown in Figs. 39 to 42, the display-tilting apparatus includes a first fixing unit 4100, a rotation unit 4200, a second fixing unit 4300, a cam

4220 and a spring unit.

The first fixing unit 4100 is fixed to the support unit and provided at its central area with a hollow central shaft 4110 protruded, as shown in Fig. 40. As shown in Figs. 40 and 42, the first fixing unit 4100 is provided at its corner area with a spring support 4120 protruded into which a leaf spring 4400 is inserted. The lead spring 4400 will be further described hereinafter.

Here, the spring support 4120 is spaced apart from an outer support 4130, which protrudes along the outer periphery of the first fixing unit 4100. The leaf spring 4400 is slidably inserted between the spring support 4120 and the outer support 4130. The spring support 4120 may be formed in the second fixing unit 4300.

The rotation unit 4200 is to be combined with the display unit. As shown in Fig. 40, the rotation unit 4200 is provided at its central area with a rotation hole 4210, into which the central shaft 4110 is inserted and rotatably combined.

The second fixing unit 4300 is fixed to the first fixing unit by a bolt 4500 or the like, with the rotation unit 4200 disposed in-between. Formed at the center of the second fixing unit 4300 is a first through-hole 4310, through which the rotation unit 4200 is combined with the display unit.

Thus, the rotation unit 4200 is coupled to the display unit through the first through-hole 4310. Here, the diameter of the first through-hole 4310 is larger than that of the rotation unit 4200 to allow a smooth rotation of the rotation unit 4200.

As shown in Figs. 40 and 42, the cam 4220 is formed integrally with the rotation unit 4200 so as to protrude along the outer peripheral face thereof.

Here, since the cam 4220 is protruded in parallel with the rotation unit 4200, as shown in Figs. 30 and 41, the cam 4220 is latched to the second fixing unit 4300 to prevent the rotation unit 4200 from being released through the first through-hole 4310.

Referring to Figs. 40 and 42, the cam 4220 is provided with a concave rest groove 4230 formed at angular intervals of 90°.

The rest grooves 4230 may be formed at different angular intervals. Here, it is preferable that an imaginary circle formed by the outer periphery of the cam 4220 is made concentric with the rotation unit 4200. Formed on top face of the cam 4220 is a first stopper protrusion 4225. A second stopper step 4320 is formed at both inner sides of the first through-hole 4310 in order to limit rotation of the first stopper protrusion 4225.

As shown in Fig. 41, part of the first through-hole 4310 in the second fixing unit 4300 has a larger inner diameter than the other remaining portion. The second stopper step 4320 is formed by both ends of the larger inner diameter hole.

Referring to Figs. 40 and 42, the spring unit includes a leaf spring 440 having a bent portion 4410 formed so as to contact the cam 4220.

As shown in Fig. 42, both ends of the leaf spring 4400 is slidably inserted between the outer support 4130 of the first fixing unit 4100 and the spring support 4120, by means of the spring support 4120.

More specifically, the spring support 4120 is formed at the corners of the first fixing unit 4100 respectively, and four leaf springs 4400 are inserted between the spring supports 4120. As described above, the leaf spring 4400, exerting an elastic force to the cam

4220, simplifies the spring unit, i.e., reduces the number of component and consequently leads to a simplified structure and a cost down.

In addition, the spring support 4120 supports the ends of the leaf spring 4400 without wobbling, and guides the leaf spring 4400 when it moves. Hereafter, operations of the above eighth embodiment will be explained.

Referring to Fig. 42(a), the bent portion 4410 of the leaf spring rests onto the rest groove 4230 of the cam 4220 such that the rotation unit 4200 cannot rotate arbitrarily due to the resiliency of the leaf spring 4400.

Here, both ends of the leaf spring 4400 are inserted into and supported by the spring support 4120.

When a user tilts the display unit and the rotation unit 4200 is rotated, as shown in Fig. 42(b), the cam 4220 rotates while pushing backwards the bent portion 4410 of the leaf spring, which had rested onto the rest groove 4230.

At this time, the leaf spring 4400 bends backwards by the cam 4220. Since both end portions of the leaf spring 4400 are slidably inserted into the spring support 4120, the leaf spring 4400 can bend smoothly while the both end portions thereof slide back and forth between the spring support 4120 and the outer support 4130.

In this way, when the leaf spring 4400 bends backwards, the both ends thereof move sideways and thus the spring unit necessitates a minimum space for bending backwards and forwards. Thus, the overall size of the display-tilting mechanism can be minimized and miniaturized.

When the user tilts the display unit by 90°, the bent portion 4410 of the leaf spring rests on the rest groove 4230 again due to the resiliency thereof, as shown in Fig. 42(a).

Furthermore, if the rotation unit 4200 is rotated by -90° or +90°, the first stopper protrusion 4225 is stopped by the second stopper step 4320 not to allow the rotation unit to further rotate.

Thus, the user can rotate the rotation unit 4200 in either direction by 90° such that the display unit combined with the rotation unit 4200 is oriented in a landscape form, i.e., in a horizontal lengthwise form, which is suitable for watching movies or the like.

In addition, the cam 4220 is in concentric relation with the rotation unit 4200, i.e., the cam 4220 portion between the rest grooves 4230 has a uniform height protruded from the rotation unit 4200. Hence, as shown in Fig. 42(b), while the rotation unit

4200 is rotating, it cannot continue to rotate without the user's rotating force, regardless of the resiliency of the leaf spring 4400.

Therefore, the rotation unit 4200, i.e., the display unit can be tilted by any arbitrary angles and held in place at any arbitrary angular position, besides the angular positions corresponding to the rest grooves 4230.

Hereafter, the ninth embodiment of the invention will be explained, with reference to the accompanying drawings. Figs. 43 and 44 are exploded perspective views of a display-tilting apparatus according to the ninth embodiment of the invention. Fig. 45 is a perspective view showing major portions of the apparatus of Fig. 43. Fig. 46 is a perspective view showing an assembled state of the apparatus of Fig. 43. Fig. 47 is a cross-sectional view of the apparatus of Fig. 46. The display-tilting apparatus includes a first cam member 10, a second cam member 30, a spring means for allowing the first and second cams to be in close contact, and a shaft member 50 for aligning the first and second cam members 10 and 30 on an axis. The first cam member 10 is formed of a first waveform face 18 and a second waveform face 26. The first waveform face 18 includes a first valley 12, a first ridge 14 and a second valley 16 formed one after another within a certain circular sector along the circumference thereof. The second waveform face 26 is in symmetry with the first waveform face 18 about the rotational center thereof and in concentric relation with the first waveform face 18 while having a different radius from the first waveform face 18. The second waveform face 26 includes a third valley 20, a second ridge 22 and a fourth valley 24 formed one after another so as to correspond to the first valley 12, the first ridge 14 and the second valley 16 respectively. The second cam member 30 includes a first protrusion 32 contacting the first waveform face and a second protrusion 34 contacting the second waveform face 26. The second protrusion 34 is in symmetry with the first protrusion 32 about the rotational center thereof. The first cam member 10, the second cam member 30, the spring means and the shaft member 50 are provided at its central area with a hollow hole through which a signal line passes.

In the outer circumferential face of the first cam member 10, a plurality of guide protrusions 28 is formed along the direction of the rotational axis. The spring means is housed inside of a housing 60. The housing 60 is provided with a guide groove 62 formed in the inner circumferential face to be engaged with the guide protrusion 28.

The second cam member 30 has a first stopper protrusion 36. The housing 60 has a pair of second stopper protrusions 66 and 68, which interrupt the first stopper protrusion 36 at the non-rotated and 180°-rotated states of the housing 60 respectively to hold the housing 60 in place.

The second cam member 30 is provided with a first wing 38 to be connected to the main body of a communications terminal. The housing 60 is provided with a second wing 64 to be coupled to the display unit of the communications terminal. The second cam member may be combined with the display unit whereas the housing may be connected to the main body.

The spring means is composed of two compression springs 40. The two compression springs 40 have different diameters such that one smaller spring is placed inside of the other larger one.

The shaft member 50 is provided at one end thereof with a flange 52, which is stopped by the end portion of the housing 60, and the other end of the shaft member 50 passes through the compression spring 40, the first cam member 10 and the second cam member 30 and then is connected with a washer 54 such that the first and second cam members 10 and 30 can rotate relative to each other. A signal line leading to the display unit from the main body of a portable terminal passes through the hole of the hollow shaft member 50 so as not to be exposed to outside and protected from external contact or the like. On the other hand, the positions of the first stopper protrusion 36 and the second stopper protrusions 66 and 68 can be appropriately adjusted to set up the rotation limit of the first cam member 10 between 0° and 180°. The first waveform face 18 and the second waveform face 26 are formed in the position between -3° and 183°. In this way, at the initial position and 180°-rotated position of the first cam member 10, an overlap of 3° is provided for the reasons as follows. At the non-rotated and 180°-rotated states, rotation of the first cam member 10 is constrained by means of the first stopper protrusion 36 and the second protrusions 66 and 68. However, the first waveform face 18 and the second waveform face 26 allows the first and second protrusions to further move as much as 3°, so that the compression spring 40 provides an elastic force to the first cam member 10, which then can have a stopping force.

That is, the first valley 12 and the third valley 20 are formed at positions reverse-rotated from a reference point by 3°, the first ridge 14 and the second ridge are formed at positions rotated from the reference point by about 30°, and the second valley 16 and the fourth valley 24 are formed at positions rotated from the reference point by about 183°.

Thus, if the first cam member 10 is rotated by 30° beyond a transition point, the second cam member 30 and the housing 60 are automatically rotated until 180°.

In addition, the apparatus of ninth embodiment is configured to rotate in one direction due to the shape of the first and second waveform faces 18 and 26.

Hereafter, operations of the above tilting apparatus will be explained.

Fig. 48 is a partial exploded perspective view of the apparatus shown in Fig. 46. Fig. 49 shows the apparatus of Fig. 48 where the display unit is rotated until the transition point. Fig. 50 shows the apparatus of Fig. 48 where the display unit has completed its rotation.

When the apparatus is closed, i.e., the display unit is not tilted, as shown in Fig. 48, the first stopper protrusion 36 of the second cam member 30 is latched with the second stopper protrusion of the housing 60 such that the first wing 38 of the second cam member 30 remains in parallel with the second wing 64 of the housing 60.

Further, the compression spring 40 pushes the first cam member 10 towards the second cam member 30 such that the first valley 12 of the first waveform face 18 remains in contact with the first protrusion 32 and the third valley 20 of the second waveform face 26 remains in contact with the second protrusion 34. At this state, the resiliency of the compression spring 40 generates a desired retaining force. Thus, the portable communications terminal remains at the state where the display unit is closed onto the main body, and also the display unit is not tilted.

At this state, if the second cam member 30 is rotated in one direction, the first and second protrusions 30 and 32 of the second cam member 30 is released from the first valley 12 of the first waveform face 18 and the third valley 20 of the second waveform face of the first cam member 10 and moves toward the first ridge 14 and the second ridge 22 respectively. Thus, the first cam member 10 pushes to compress the compression spring 40. Until the second cam member 30 rotates up to 30°, the elastic force of the compression spring 40 serves as a resistant force against rotation of the second cam member 30.

Then, as shown in Fig. 49, when the second cam member 30 rotates by 30°, the first and second protrusions 32 and 34 of the second cam member 30 are released from the first ridge 14 of the first waveform face 18 and the second ridge 22 of the second waveform face of the first cam member, and move towards the second valley 16 and the fourth valley 24. From this point, the elastic force of the compression spring 40 acts to rotate the first cam member 10. Therefore, the display unit connected to the second cam member 30 comes to rotate automatically up to the 180°-open position.

As shown in Fig. 50, when the second cam member 30 and the display unit rotate 180°, the first stopper protrusion 36 of the second cam member 30 is stopped by the second stopper protrusion 68 of the housing 60 to allow no further rotation. In addition, the first wing 38 of the second cam member 30 remains in parallel with the second wing 64 of the housing 60. Further, the compression spring 40 pushes the first cam member 10 towards the second cam member 30 such that the second valley 16 of the first waveform face 18 contacts the first protrusion 32 and the fourth valley 24 of the second waveform face 26 contacts the second protrusion 34. At this state, the compression spring 40 generates a desired retaining force such that the display unit of a portable terminal remains at the 180°-rotated state with respect to the main body.

On the other hand, closing operations of the second cam member 30 and the display unit are carried out in the reverse orders of the above opening operations.

Hereafter, the tenth embodiment of the invention will be explained, with reference to the accompanying drawings. Figs. 51 and 52 are exploded perspective views of a display-tilting apparatus according to the tenth embodiment of the invention. Fig. 53 is a perspective view showing an assembled state of the apparatus of Fig. 51. Fig. 54 is a perspective view showing a first cam member and a second cam member in the apparatus of Fig. 51. Fig. 55 is a perspective view showing an assembled sated of a stopper, a stopper and a housing in the apparatus of Fig. 51. Fig. 56 shows operations of the apparatus of Fig. 51.

As shown in Figs. 51 to 56, the apparatus according to the tenth embodiment includes a first cam member 10, a second cam member 30, a spring means, a shaft member 50, a housing 60 and a stopper 70. The first cam member 10 is formed of a first waveform face 18 and a second waveform face 26. The first waveform face 18 includes a first valley 12, a first ridge 14 and a second valley 16 formed one after another within a certain circular sector along the circumference thereof. The second waveform face 26 is in symmetry with the first waveform face 18 about the rotational center thereof and in concentric relation with the first waveform face 18 while having a different radius from the first waveform face 18. The second waveform face 26 includes a third valley 20, a second ridge 22 and a fourth valley 24 formed one after another so as to correspond to the first valley 12, the first ridge 14 and the second valley 16 respectively.

The second cam member 30 includes a first protrusion 32 contacting the first waveform face and a second protrusion 34 contacting the second waveform face 26. The second protrusion 34 is in symmetry with the first protrusion 32 about the rotational center thereof.

The spring means is for making the first and second cam members 10 and 30 to be in close contact with each other.

The shaft member 50 is for aligning the first and second cam members 10 and 30 on one axis.

The first cam member 10, the second cam member 30, the spring means and the shaft member 50 are provided at its central area with a hollow hole through which a signal line passes.

The housing 60 is formed of a hollow cylinder. The spring means and the first cam member 10 are mounted inside of the housing 60.

In the outer circumferential face of the first cam member 10, a plurality of guide protrusions 28 is formed in the direction of the rotational axis. The housing 60 is provided with a guide groove 62 formed in the inner circumferential face to be engaged with the guide protrusion 28. The stopper 70 is formed of a hollow cylinder and mounted around the first and second protrusions 32 and 34 of the second cam member 30. The housing 60 is provided with a second stopper protrusion 66 and a third stopper protrusion 68 formed at the outer circumferential face at 180° intervals. The stopper 70 is provided with a first stopper protrusion 75 formed to contact the second stopper protrusion 66 at the non-rotated state of the housing and to contact the third stopper protrusion 68 at the 180°-rotated state of the housing 60.

The second and third stopper protrusions 66 and 68 have an identical size.

In addition, the second cam member 30 is provided at one side thereof with a travel groove 39 along which the first stopper protrusion 75 can move.

The travel groove 39 is formed in the first wing 38 side of the second cam member 30, which will be described later.

The travel groove 39 is formed to have a length corresponding to the rotational length of the second or third stopper protrusion 66 or 68 plus twice the rotational length of the first stopper protrusion 75.

The second cam member 30 is provided with a first wing 38 to be connected to the main body of a communications terminal. The housing 60 is provided with a second wing 64 to be coupled to the cover (having a display unit) of the communications terminal.

The second cam member 30 may be combined with the cover having the display unit whereas the housing 60 may be connected to the main body. The spring means is composed of two compression springs 40. The two compression springs 40 have different diameters such that one smaller spring is placed inside of the other larger one.

The shaft member 50 is provided at one end thereof with a flange 52, which is stopped by the end portion of the housing 60, and the other end of the shaft member 50 passes through the housing 60, the compression spring 40, the first cam member 10 and the second cam member 30 and then is connected with a washer 54 such that the first and second cam members 10 and 30 can rotate relative to each other.

A signal line leading to the cover from the main body of a portable terminal passes through the hole of the hollow shaft member 50 so as not to be exposed to outside and protected from external contact or the like. On the other hand, the positions of the first stopper protrusion 36 and the second stopper protrusions 66 and 68 can be appropriately adjusted to set up the rotation limit of the first cam member 10 between 0° and 180°. The first waveform face 18 and the second waveform face 26 are formed in the position between -3° and 183°.

In this way, at the initial position and 180°-rotated position of the first cam member 10, an overlap of 3° is provided for the reasons as follows. At the non-rotated and 180°-rotated states, rotation of the first cam member 10 is constrained by means of the first stopper protrusion 36 and the second and third protrusions 66 and 68.

However, the first waveform face 18 and the second waveform face 26 allows the first and second protrusions to further move as much as 3°, so that the compression spring 40 provides an elastic force to the first cam member 10, which then can have a stopping force.

That is, the first valley 12 and the third valley 20 are formed at positions reverse-rotated by 3° from a reference point, the first ridge 14 and the second ridge 22 are formed at positions rotated by about 30°from the reference point, and the second valley 16 and the fourth valley 24 are formed at positions rotated by about 183° from the reference point.

In addition, the apparatus of this embodiment is configured to rotate in one direction due to the shape of the first and second waveform faces 18 and 26. Hereafter, operations of the above tilting apparatus will be explained. When the apparatus is closed, i.e., the display unit is not tilted, as shown in Fig. 56(a), the first stopper protrusion 75 of the stopper 70 comes to be placed between one end of the travel groove 39 and the second stopper protrusion 66 of the housing 60.

That is, the second stopper protrusion 66 of the housing 60 pushes the first stopper protrusion 75 of the stopper 70, and thus the first stopper protrusion 75 moves along the travel groove 39 and then contacts one end of the travel groove 39.

At this time, since the travel groove 39 is formed to the first wing 38 side of the second cam member 30 and the length of the travel groove 39 corresponds to the summation of the second stopper protrusion 66 and twice the first stopper protrusion 75, the second stopper protrusion 66 of the housing 60 is placed in parallel with the first wing 38 of the second cam member 30 and consequently the first wing 38 of the second cam member 30 becomes in parallel to the second wing 64 of the housing 60.

Further, the compression spring 40 pushes the first cam member 10 towards the second cam member 30 such that the first valley 12 of the first waveform face 18 remains in contact with the first protrusion 32 and the third valley 20 of the second waveform face 26 remains in contact with the second protrusion 34.

At this state, the resiliency of the compression spring 40 generates a desired retaining force. Thus, the portable communications terminal remains at the state where the cover is closed onto the main body, and also the display unit is not tilted. At this state, if the second cam member 30 is rotated in one direction, the first and second protrusions 32 and 34 of the second cam member 30 is released from the first valley 12 of the first waveform face 18 and the third valley 20 of the second waveform face 26 of the first cam member 10 and moves toward the first ridge 14 and the second ridge 22 respectively. Thus, the first cam member 10 pushes to compress the compression spring 40.

Until the second cam member 30 rotates up to 30°, the elastic force of the compression spring 40 serves as a resistant force against rotation of the second cam member 30.

When the second cam member 30 rotates by 30°, the first and second protrusions 32 and 34 of the second cam member 30 are released from the first ridge 14 of the first waveform face 18 and the second ridge 22 of the second waveform face of the first cam member, and move towards the second valley 16 and the fourth valley 24.

From this point, the elastic force of the compression spring 40 acts to rotate the first cam member 10.

Therefore, the second cam member 30 and the cover connected thereto come to rotate automatically up to the 180°-open position.

If the second cam member 30 and the cover rotate 180° in the arrow direction of Fig. 56(b), the stopper 70 rotates together with the second cam member 30 and finally the first stopper protrusion 75 is stopped by the third stopper protrusion 68, which is placed in the 180° opposite side of the second stopper protrusion 66 of the housing 60.

The second cam member 30 further rotates, and the first stopper protrusion 75 of the stopper 70 latched by the third stopper protrusion 68 moves along the travel groove 39 and then contacts the other end of the travel groove 39 and is stopped thereby.

Here, since the travel groove 39 is formed to the first wing 38 side of the second cam member 30 and the length of the travel groove 39 corresponds to the summation of the third stopper protrusion 68 and twice the first stopper protrusion 75, the third stopper protrusion 68 of the housing 60 is placed in parallel with the first wing

38 of the second cam member 30 and consequently the first wing 38 of the second cam member 30 becomes in parallel to the second wing 64 of the housing 60. As described above, the length of the travel groove 39 corresponds to the sum of the length of the second or third stopper protrusion 66 or 68 and twice the length of the first stopper protrusion 75. This is to prevent the following situation, hi case where the second cam member 30 rotates, if the first stopper protrusion 75 is fixed, the second cam member 30 can not perform a compete rotation of 180° due to their own lengths of the second and third stopper protrusions 66 and 68. Thus, the second wing 64 of the housing 60 cannot become in parallel with the first wing 38 of the second cam member 30.

Further, the compression spring 40 pushes the first cam member 10 towards the second cam member 30 such that the second valley 16 of the first waveform face 18 contacts the first protrusion 32 and the fourth valley 24 of the second waveform face 26 contacts the second protrusion 34.

At this state, the compression spring 40 generates a desired retaining force such that the cover of a portable terminal remains at the 180°-rotated state with respect to the main body.

On the other hand, closing operations of the second cam member 30 and the cover are carried out in the reverse orders of the above opening operations.

[Industrial Applicability]

As described above, the present invention provides a display-tilting mechanism for communication terminals, in which the display unit thereof can be tilted in both directions to switch over from a portrait orientation to a landscape orientation and vice versa.

In addition, the present invention provides an apparatus for rotating or tilting the display unit of a communications terminal and simultaneously slidably opening and closing the communications terminal. Further, the present invention provides to a display-tilting mechanism of a communications terminal, which has an improved cam structure to thereby enable a slim structure of the terminal.

Furthermore, the present invention provides an apparatus for opening and closing a communications terminal in a swing and semi-automatic fashion, in which the retainer means has a transition point at an angle other than 90° to provide a structural stability.

Although the present invention has been described with reference to several exemplary embodiments, the description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications and variations may occur to those skilled in the art, without departing from the spirit and scope of the invention, as defined by the appended claims.

Claims

[CLAIMS] [Claim 1]

A display-titling apparatus of a communications terminal, in which a display unit is combined to a support portion of the communications terminal, the support portion being hinged to the main body of the communications terminal, the apparatus comprising: a first fixed portion fixed to the support portion and having a central shaft portion; a rotating portion combined with the display unit and rotatably coupled to the central shaft portion; a second fixed portion combined to the first fixed portion while covering the rotating portion, the second fixed portion having a first through-hole to expose part of the rotating portion in order for the rotating portion to be coupled to the display unit; a cam formed in either the first fixed portion or the rotating portion at a radial position from the rotation center thereof, the can having a protrusion at a certain angular position from a reference position; a spring unit installed in either the first fixed portion or the rotating portion wherever the cam is not formed, the cam exerting a desired spring force to the cam under states where the rotating portion is not rotated and rotated by a certain angle respectively, thereby providing a certain retaining force; and a retainer unit for retaining the rotating portion at a position where the rotating portion is rotated by a certain angle with respect to the first fixed portion, wherein the retainer unit includes a first stopper step formed in the rotating portion, and a second stopper step formed at two positions in either the first fixed portion or the second fixed portion such that the first stopper step is prevented from being rotated beyond a certain angle in both directions.

[Claim 2]

The apparatus as claimed in claim 1, wherein the central shaft portion is provided with a central hole formed, through which a signal line leading to the display unit from the support portion passes.

[Claim 3]

The apparatus as claimed in claim 1, wherein the protrusion is formed in the cam at angular intervals of 90°, and the spring unit is formed at 90° intervals.

[Claim 4]

The apparatus as claimed in claim 1, wherein the spring unit includes: a slider block linear-mo vably installed in either first fixed portion or the rotating portion, the slider block contacting the cam to inhibiting rotation of the protrusion; and a spring for exerting an elastic force to the slider block.

[Claim 5] The apparatus as claimed in claim 4, wherein either the first fixed portion or the rotating portion is provided with a guide groove formed to guide movement of the slider block.

[Claim 6]

An apparatus for tilting a display unit in a communications terminal having a display unit and a main body, the apparatus comprising; a rotation member fixed to the display unit, the rotation member having a central shaft; a first slider member rotatably combined with the central shaft and having a cam; a cover combined with the first slider member in a way to wrap around the rotation member, the cover having an opening through which part of the rotation member is exposed; a pusher member installed between the rotation member and the first slider member and pushing the cam to generate a desired retaining force when the rotation member is not rotated and rotated by a certain angle respectively; a retainer member for preventing the rotation member from further rotating from a state rotated by a certain angle; a second slider member fixed to the main body and slidably combined with the first slider member, the second slider member having one or more slant faces, the slant face having a transition point where the inclination direction is reversed; a resilient member generating an elastic force perpendicularly to moving direction of the first slider member; a connector member for coupling the resilient member to the first slider member; and one or more slip member transferring the elastic force of the resilient member to the slant face such that the first and second slider members slide against each other.

[Claim 7]

The apparatus as claimed in claim 6, wherein the central shaft of the rotation member is formed with a central hole through which a signal line passes.

[Claim 8]

The apparatus as claimed in claim 6, wherein the cam is provided at the central area thereof with a first through-hole into which the central shaft is inserted, and at a radial position from the rotating center thereof with a protrusion at angular intervals of 90°, and the pusher member is installed at angular intervals of 90°.

[Claim 9] The apparatus as claimed in any one of claims 6 to 8, wherein the pusher member includes a slider block movably installed in the rotation member and contacting the cam to prohibit rotation of the protrusion; and a spring for pushing the slider block.

[Claim 10] The apparatus as claimed in claim 9, wherein the rotation member is provided with a first guide hole formed so as to guide movement of the slider block.

[Claim 11]

The apparatus as claimed in claim 10, wherein the retainer member includes a stopper protrusion formed in the central shaft; and a stopper step formed in the first through-hole of the cam to allow the rotation member to rotate in either direction within a certain angular range.

[Claim 12]

The apparatus as claimed in claim 11, wherein the stopper step is formed at angular intervals of 180°.

[Claim 13]

The apparatus as claimed in claim 10, wherein the retainer member includes: a pair of guide rivets combined to the rotation member; a curved through-opening formed in the first slider member so as to pass the guide rivets; a straight guide groove formed in the second slider member such that free end of the guide rivet having passed through the curved through-opening rests thereon; and a curved guide groove connected with the straight guide groove and for limiting rotation of the guide rivet.

[Claim 14]

The apparatus as claimed in claim 10, wherein the retainer member includes; a seesaw guide fixed to the second slider member; a seesaw combined to the seesaw guide so as to be capable of seesawing, a seesaw rivet being protruded in one side of the seesaw and a presser plate inclined to one side being formed in the other side of the seesaw; a pusher plate formed in the first slider member to push the presser plate for the seesaw to perform seesawing; a seesaw rivet through-hole formed in the second slider member, the seesaw rivet protruding through the seesaw rivet through-hole when seesawing; a seesaw spring provided between the seesaw guide and the seesaw to resiliently support the seesaw; and a semi-circular retainer groove formed in one side of the display unit.

[Claim 15] The apparatus as claimed in claim 11, wherein the slant face is formed in pairs symmetrically about moving axis of the second slider member and the connector member and the slip member are formed in pairs.

[Claim 16]

The apparatus as claimed in claim 11, wherein the second slider member is provided with one or more guide rods fixed in moving direction of the second slider member and the first slider member is provided with a third guide hole with which the guide rod is slidably combined, such that the first and second slider members are slidably coupled to each other by means of slidable engagement of the guide rod and the guide hole.

[Claim 17]

The apparatus as claimed in claim 11, wherein the resilient member is formed of a torsion spring.

[Claim 18]

The apparatus as claimed in claim 11, wherein the first slider member is provided with a cover combined thereto so as to prevent the resilient member from being released.

[Claim 19]

The apparatus as claimed in any one of claims 11 to 16, wherein the connector member is made up of one or more links, one end of which is shaft-supported on the first slider member and the other end of which is shaft-supported on an end portion of the resilient member such that the resilient member is supported on the first slider member.

[Claim 20]

The apparatus as claimed in claim 17, wherein the slip member is formed of a roller shaft-supported on the line and rolling on the slant face.

[Claim 21]

The apparatus as claimed in claim 18, wherein the slant face is provided with one or more retainer grooves formed so as to exert a desired retaining force to the roller.

[Claim 22]

A display-tilting mechanism for a communications terminal, in which a main body is hinged with a support portion with which a display unit is rotatably combined, the mechanism comprising: a first fixing unit fixed to the support portion and having a central shaft; a rotation unit coupled to the display unit and rotatably combined with the central shaft; a second fixing unit combined with the first fixing unit with the rotation unit placed in-between, the second fixing unit having a first through-hole through which the rotation unit is combined with the display unit; a cam formed in the rotation unit; and a spring unit disposed between the first fixing unit and the second fixing unit so as to exert an elastic force to the cam, wherein the cam protrudes from a side face of the rotation unit, the cam is provided at the top face thereof with a first stopper step, and a second stopper step for limiting rotation of the first stopper step is formed in the inner circumference of the first through-hole of the second fixing unit.

[Claim 23]

The mechanism as claimed in claim 22, wherein the cam is provided with a concave rest groove formed in 90° intervals.

[Claim 24]

The mechanism as claimed in claim 23, wherein the spring unit includes a slider slidably disposed and a spring for exerting a spring force to the slider, the slider being provided at the front side thereof with a protrusion to be rested onto the rest groove.

[Claim 25]

A display-tilting apparatus for a communications terminal, in which a main body is hinged with a support portion with which a display unit is rotatably combined, the mechanism comprising: a first fixing unit fixed to the support portion and having a central shaft; a rotation unit coupled to the display unit and rotatably combined with the central shaft; a second fixing unit combined with the first fixing unit with the rotation unit placed in-between, the second fixing unit having a first through-hole through which the rotation unit is combined with the display unit; a cam formed in the rotation unit; and a spring unit disposed between the first fixing unit and the second fixing unit so as to exert an elastic force to the cam, wherein the cam protrudes from a side face of the rotation unit.

[Claim 26]

The apparatus as claimed in claim 25, wherein the cam is formed at intervals of 90° along the outer circumference of the rotation unit such that a rest portion is formed between the cams.

[Claim 27]

The apparatus as claimed in claim 25 or 26, wherein the height of the cam protruded from the outer face of the rotation unit increases gradually towards the center thereof,

[Claim 28] The apparatus as claimed in claim 25 or 26, wherein the cam protruded from the outer face of the rotation unit has a uniform height and both ends portions of the cam are inclined. [Claim 29]

The apparatus as claimed in claim 25, wherein the spring member includes a roller mounted so as to be capable of horizontally moving and contacting the cam; a slider installed so as to be capable of horizontally moving and contacting the rear side of the roller; and a spring exerting an elastic force to the slider. [Claim 30]

The apparatus as claimed in claim 29, wherein the roller is provided with a guide protrusion formed in the top and bottom faces thereof, and the first and second fixing units are provided with an elongated guide hole respectively into which the guide protrusion is inserted to guide movement of the roller. [Claim 31]

The apparatus as claimed in claim 29 or 30, wherein the spring is disposed at both rear sides of the slider respectively, and the slider is provided at the central portion thereof with a curved portion formed to be concaved rearwards. [Claim 32]

A display-tilting apparatus for a communications terminal, in which a first body is hinged with a support portion with which a second body is rotatably combined, the mechanism comprising: a first fixing unit fixed to the support portion and having a central shaft; a rotation unit coupled to the second body and rotatably combined with the central shaft; a second fixing unit combined with the first fixing unit with the rotation unit placed in-between, the second fixing unit having a first through-hole through which the rotation unit is combined with the second body; a cam protruded in a radial direction from the rotation unit; and a spring unit disposed between the first fixing unit and the second fixing unit so as to exert an elastic force to the cam, wherein the cam is provided with a concave rest groove, and the spring unit is provided with a leaf spring having a bent portion formed so as to contact the cam. [Claim 33]

The apparatus as claimed in claim 32, wherein the first and second fixing units are provided with a spring support into which both ends of the leaf spring are slidably inserted. [Claim 34]

The apparatus as claimed in claim 32 or 33, wherein the cam is in concentric relation with the rotation unit. [Claim 35]

The apparatus as claimed in claim 32 or 33, wherein the cam is provided with a first stopper protrusion formed on top face thereof, and the first through-hole of the second fixing unit is provided with a second stopper step formed at both sides of the inner face thereof, to thereby limit rotation of the first stopper protrusion. [Claim 36]

A display-tilting apparatus for a communications terminal, the apparatus comprising: a first cam member including a first waveform face and a second waveform face, the first waveform face having a first valley, a first ridge and a second valley formed one after another in a certain range of circular area, the second waveform face being concentric and symmetrical with the first waveform face and having a different radius from the first waveform face, the second waveform face having a third valley, a second ridge and the fourth valley formed one after another correspondingly to the first valley, the first ridge and the second valley respectively; a second cam member including a first protrusion contacting the first waveform face and a second protrusion contacting the second waveform face; a spring means for allowing the first and second cam member to be in close contact with each other; and a shaft member for aligning the first and second cam members on an axis. [Claim 37]

The apparatus as claimed in claim 36, wherein the first and second cam members and the spring means are provided at the central area thereof with a hollow space through which a signal line passes. [Claim 38]

The apparatus as claimed in claim 36, wherein the first cam member is provided with a plurality of guide protrusions formed in the rotational axis at the outer circumferential face thereof, and a guide groove to be engaged with the guide protrusion is formed in the inner circumferential face of a housing, the housing accommodating the spring means. [Claim 39]

The apparatus as claimed in claim 38, wherein the second cam member and the housing are provided with a stopper protrusion for retaining the housing at non-rotated and 180°-rotated states. [Claim 40]

The apparatus as claimed in claim 39, wherein the first and second waveform faces are formed within an angular range of -3° to -183°. [Claim 41]

A swing mechanism for opening and closing a communications terminal, the apparatus comprising: a first cam member including a first waveform face and a second waveform face, the first waveform face having a first valley, a first ridge and a second valley formed one after another in a certain range of circular area, the second waveform face being concentric and symmetrical with the first waveform face and having a different radius from the first waveform face, the second waveform face having a third valley, a second ridge and the fourth valley formed one after another correspondingly to the first valley, the first ridge and the second valley respectively; a second cam member including a first protrusion contacting the first waveform face and a second protrusion contacting the second waveform face; a spring means for allowing the first and second cam member to be in close contact with each other; a housing accommodating the spring means and the first cam member, the housing being combined with the first cam member so as to limit rotation of the first cam member; and a stopper mounted around the first and second protrusions of the second cam member, wherein the housing is provided with second and third stopper protrusions formed in the outer circumferential face thereof at 180° intervals, and the stopper is provided with a first stopper protrusion configured to contact the second stopper protrusion at non-rotated state of the housing and contact the third stopper protrusion at 180°-rotated state of the housing. [Claim 42]

The mechanism as claimed in claim 41, wherein the stopper is mounted rotatably with respect to the second cam member, and the second cam member is provided with a travel groove where the first stopper protrusion can move. [Claim 43]

The mechanism as claimed in claim 42, wherein the travel groove has a length substantially equal to the sum of rotational length of the second stopper protrusion and twice rotational length of the first stopper protrusion.