1. A portable communication device comprising:
a first housing;
a second housing with a first display device, the second housing being arranged after being swung from the first housing at a known tilt angle; and
a third housing with a second display device, the third housing being stacked with the second housing before the second housing is swung out from the first housing, the third housing being extended from the second housing and tiltedly arranged to the second housing after the second housing is swung out from the first housing.
2. The portable communication device as claimed in claim 1, wherein the first housing is formed with a cradle recess for cradling the third housing.
3. The portable communication device as claimed in claim 1, wherein the first and second display devices are used as individual display devices, and when the first and second housings are extended, the first and second display devices form a large screen by arranging the second and third housings to be flush with each other, so that they can be used as a touch screen or a keypad.
4. The portable communication device as claimed in claim 1, wherein the third housing is extended from the lower edge of the second housing and tilted at an angle equal to the tilt angle of the second housing.
5. A cradle apparatus for a portable communication device, the portable device comprising:
A first housing, a second housing with a first display device, the second housing being cradled in the first housing, and a third housing with a second display device, the third housing being stacked with the second housing in the first housing, the second housing extendable from the first housing and the third housing being extended from the second housing and tiltedly arranged with the second housing after the second housing is swung from the first housing, wherein the cradle apparatus comprises:
a swing hinge unit provided in the second housing so as to allow a swing movement of the second housing;
a tilt hinge unit anchored to the first housing so as to allow the swing hinge unit to be tiltedly rotated; and
a plurality of link units provided at each of the opposite ends of the swing hinge unit, so that when the swing hinge unit is tiltedly rotated by the tilt hinge unit, the link units are tiltedly rotated and perform a seesaw movement in such a manner that the third housing is extended from the second housing and tiltedly rotated.
6. The cradle apparatus as claimed in claim 5, wherein the link units comprise:
a first link unit provided at each of the opposite ends of the swing hinge unit in such a manner that the first link unit is tiltedly rotated by the tilt hinge unit;
a second link unit rotatably joined to the first link unit and a fourth link unit provided on the third housing, the second link unit being rotated about a first axis and performing a seesaw movement when the first link unit is tiltedly rotated;
a third link unit anchored to the first housing and providing the first axis, the third link unit supporting the seesaw movement of the second link unit;
the fourth link unit anchored to the third housing so as to rotate the third housing about a second axis in response to the seesaw movement of the second link unit; and
a fifth link unit anchored to the first housing and providing the second axis, the fifth link unit supporting the third housing in such a manner that the third housing can be tiltedly rotated.
7. The cradle apparatus as claimed in claim 5, wherein the swing hinge unit comprises:
a base member;
a flat plate joined to the base member in such a manner that the flat plate is tiltedly rotated together with the base member;
a swing plate anchored to the second housing and joined to the flat plate to be capable of being swung; and
a pair of elastic members provided in the base member so as to provide elastic force for swinging the swing plate.
8. The cradle apparatus as claimed in claim 7, wherein the elastic members are formed from one of a coil spring, a wire spring, a leaf spring and a crank shaft.
9. The cradle apparatus as claimed in claim 5, wherein the tilt hinge unit comprises:
a body housing formed with a screwed part to be screwed to the first housing;
at least one hinge hole formed at one end of the body housing, and joined with a pair of hinge pines formed on the flat plate to be rotatable about a rotary axis, the hinge hole tiltedly rotating the flat plate; and
a hinge unit provided within the body housing at a position corresponding to that of a cam formed on the flat plate, the cam and a ball being engaged with or disengaged from each other in response to the rotation of the flat plate, thereby limiting the tilting rotation of the swing hinge unit and providing a click feeling.
10. The cradle apparatus as claimed in claim 9, wherein the hinge unit comprises:
an actuation hole formed in the body housing containing the ball, the ball being introduced into, or extracted from, the actuation hole in response to its engagement with or disengagement from the cam;
a coil spring provided within the actuation hole so as to provide elastic force for allowing the ball to be introduced into or extracted from the actuation hole; and
a spring support for supporting the elastic force of the coil spring.
11. The cradle apparatus as claimed in claim 7, wherein the flat plate has a stopper formed at one end thereof, which comes into contact with a stopper protrusion formed on the tilt hinge unit and limits the rotation of the swing plate.
12. The cradle apparatus as claimed in claim 6, wherein one end of the first link unit is formed with a first connection part connected to one of the opposite ends of the swing unit,
the other end of the first link unit is formed with a second connection part which is connected to the second link unit in such a manner to be capable of being tiltedly rotated, and
the central area of the first link unit is formed with an engagement recess to be engaged with or disengaged from the third link unit as the first link unit is tiltedly rotated.
13. The cradle apparatus as claimed in claim 12, wherein one end of the second link unit is formed with a first link hole which is joined to the second connection part formed on the first link unit to be capable of being tiltedly rotated,
the central area of the second link unit is formed with a second link hole for supporting the second link unit in such a manner that the second link unit can be rotated about the second axis, thereby performing seesaw movement, and
the other end of the second link unit is formed with a third link hole rotatably joined with a rotary joint protrusion formed on the fourth link unit.
14. The cradle apparatus as claimed in claim 6, wherein the third link unit comprises:
at least one third link unit side connection part anchored to the first unit; and
a rotary protrusion formed at the center of the third link unit and providing the first axis, the rotary protrusion being rotatably fitted in the second link hole.
15. The cradle apparatus as claimed in claim 6, wherein the fourth link unit comprises:
at least one fourth link side connection part joined to the first housing;
a rotary joint protrusion formed at one end of the fourth link unit, the rotary joint protrusion being rotatably fitted in the third link hole formed at the other end of the second link unit; and
a rotary joint groove formed at the other end of the fourth link unit, the rotary joint groove being rotatably joined with a rotary protrusion formed on the fifth link unit.
16. The cradle apparatus as claimed in claim 15, wherein the fifth link unit comprises:
at least one fifth link unit side connection part anchored to the first housing; and
the rotary protrusion rotatably joined to the rotary joint groove of the fourth link unit and providing the second axis, the rotary protrusion allowing the third housing to be rotated.
17. The cradle apparatus as claimed in claim 6, wherein at least one first elastic member is provided between the second and fourth link units so as to provide elastic force for automatically tiltedly rotating the third housing, and
at least one second elastic member and at least one third elastic member are provide under the second and third housings so as to automatically tiltedly rotate the second and third housing by elastic force.
18. The cradle apparatus as claimed in claim 17, wherein the first elastic member is provided within a space formed in the fourth link unit, and fitted on the rotary protrusion formed on the third link unit, the first elastic member providing elastic force for the fourth link unit.
19. A cradle apparatus for a portable communication device comprising comprises a first housing, a second housing having a first display device, the second housing being slidable from the first housing in the state in which the second housing is opposite to the first housing, and a third housing having a second display device, the third housing being stacked with the second housing before the second housing is slid from the first housing and being extended from the second housing, wherein the cradle apparatus comprises:
a moving plate anchored to the second housing;
a sliding unit slidably joined with the moving plate to allow a sliding movement of the moving plate;
a tilt hinge unit anchored to the first housing so as to tiltedly rotate the moving plate and the sliding unit; and
a plurality of link units provided at each of the opposite ends of the sliding unit, so that when the moving plate and the sliding unit are tiltedly rotated, the link units are tiltedly rotated and perform a seesaw movement in such a manner that the third housing is extended from the second housing.
20. The cradle apparatus as claimed in claim 19, wherein the link units comprise:
a first link unit provided at one of the opposite ends of the sliding unit being provided with such a first link unit in such a manner that when the moving plate is slid from the first housing, the first link unit is tiltedly rotated by the tilt hinge unit;
a second link unit rotatably joined to the first link unit and a fourth link unit provided on the third housing, the second link unit being rotated about a first axis and performing a seesaw movement when the first link unit is tiltedly rotated;
a third link unit anchored to the first housing and providing the first axis, the third link unit supporting the seesaw movement of the second link unit;
the fourth link unit anchored to the third housing so as to rotate the third housing about a second axis in response to the seesaw movement of the second link unit; and
a fifth link unit anchored to the first housing and providing the second axis, and the fifth link unit supporting the third housing in such a manner that the third housing can be tiltedly rotated.
21. The cradle apparatus as claimed in claim 19, wherein the sliding unit is formed with a guide movement part which is tiltedly rotated together with the sliding unit, the moving plate being slidably joined to the guide movement part.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An automatic adjustment circuit, comprising:
a passive element disposed in an end portion of a circuit board; and
an impedance adjustment circuit disposed between the passive element and a ground section of the circuit board to adjust impedance of the passive element.
2. An automatic adjustment circuit according to claim 1, further comprising an antenna for transmittingreceiving a radio signal tofrom an end portion of the circuit board opposed to the end portion in which the passive element is disposed,
wherein the impedance adjustment circuit adjusts the impedance of the passive element according to a frequency used when the antenna transmitsreceives the radio signal.
3. An automatic adjustment circuit according to claim 2, further comprising a control circuit for outputting an adjustment circuit control signal to control the impedance adjustment circuit according to the frequency.
4. An automatic adjustment circuit according to claim 3, wherein:
the adjustment circuit control signal is a signal of a voltage; and
the control circuit comprises a voltage generation circuit for outputting the voltage.
5. An automatic adjustment circuit according to claim 1, wherein:
the impedance adjustment circuit comprises a PIN diode connected to the, passive element; and
a current source for making variable a current supplied to the PIN diode.
6. An automatic adjustment circuit according to claim 5, wherein the impedance adjustment circuit further comprises a coil between the passive element and the PIN diode.
7. An automatic adjustment circuit according to claim 1, wherein:
the impedance adjustment circuit comprises a variable capacitance diode connected to the passive element; and
a voltage is applied between the variable capacitance diode and the passive element.
8. An automatic adjustment circuit according to claim 1, wherein the impedance adjustment circuit adjusts the impedance of the passive element to disperse a current in a center of the circuit board.
9. An automatic adjustment circuit according to claim 1, wherein the passive element is formed into a coil shape or a meandering shape.
10. An automatic adjustment circuit according to claim 1, wherein the passive element is formed as a pattern on the circuit board.
11. A portable terminal, comprising the automatic adjustment circuit of claim 1.
12. An automatic adjustment method, comprising the steps of:
causing an antenna disposed in a circuit board to transmitreceive a radio signal; and
adjusting impedance of a passive element disposed in the circuit board according to a frequency used when the antenna transmitsreceives the radio signal.
13. An automatic adjustment method according to claim 12, wherein the adjusting step comprises outputting a voltage according to the frequency.
14. An automatic adjustment method according to claim 13, wherein said outputting comprises adjusting the impedance of the passive element by using the output voltage.
15. An automatic adjustment method according to claim 12, wherein the adjusting step comprises supplying a current to a PIN diode connected to the passive element.
16. An automatic adjustment method according to claim 15, wherein the adjusting step comprises disposing a coil between the PIN diode and the passive element, and adjusting the impedance of the passive element to be inductive.
17. An automatic adjustment method according to claim 12, wherein the adjusting step comprises applying a voltage between a variable capacitance diode and the passive element, the variable capacitance diode being connected to the passive element.
18. An automatic adjustment method according to claim 12, wherein the adjusting step comprises adjusting the impedance of the passive element to disperse a current in a center of the circuit board.
19. A portable terminal, which uses the automatic adjustment method of claim 12.
20. An automatic adjustment circuit, comprising:
a passive element disposed in one end portion of a circuit board;
an antenna, disposed in another end portion of the circuit board, for transmittingreceiving a radio signal; and
impedance adjusting means, disposed between the passive element and a ground section of the circuit board, for adjusting impedance of the passive element,
wherein the impedance adjusting means adjusts the impedance of the passive element according to a frequency when the antenna transmitsreceives the radio signal.