The above objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout. In addition, when it is determined that the detailed description of the known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
Hereinafter, a mobile terminal according to the present invention will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.
The mobile terminal described herein may include a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation terminal, and the like.
1 illustrates a mobile terminal according to an embodiment of the present invention.
Referring to FIG. 1, the mobile terminal 100 includes a wireless communication unit 110, an A / V input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, and a memory. The unit 160, an interface unit 170, a controller 180, and a power supply unit 190 may be included. The configuration of the mobile terminal 100 is not limited to only the components shown in FIG. 1, and more components may be added or some components may be omitted according to a function added or omitted in the mobile terminal.
The wireless communication unit 110 may include one or more modules that enable wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and a network in which the mobile terminal 100 is located. For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless internet module 113, a short range communication module 114, a location information module 115, and the like. . The radio communication unit 110 is connected to an antenna 43 that transmits a high frequency signal and receives a high frequency signal through a wireless channel.
The broadcast receiving module 111 receives a broadcast signal and / or broadcast related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may mean a server that generates and transmits a broadcast signal and / or broadcast related information or a server that receives a previously generated broadcast signal and / or broadcast related information and transmits the same to a terminal. The broadcast signal may include not only a TV broadcast signal, a radio broadcast signal, and a data broadcast signal, but also a broadcast signal having a data broadcast signal combined with a TV broadcast signal or a radio broadcast signal.
The broadcast related information may mean information related to a broadcast channel, a broadcast program, or a broadcast service provider. Broadcast related information may also be provided through a mobile communication network. In this case, broadcast related information may be received by the mobile communication module 112.
The broadcast related information may exist in various forms. For example, it may be produced in the form of Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H).
The broadcast receiving module 111 receives broadcast signals using various broadcasting systems, and in particular, digital multimedia broadcasting-terrestrial (DMB-T), digital multimedia broadcasting-satellite (DMB-S), and media forward link only (MediaFLO). The digital broadcast signal may be received using a digital broadcasting system such as Digital Video Broadcast-Handheld (DVB-H) or Integrated Services Digital Broadcast-Terrestrial (ISDB-T). Of course, the broadcast receiving module 111 may be configured to be suitable for not only the above-described digital broadcast system but also other broadcast systems for providing broadcast signals.
The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory unit 160. The mobile terminal 100 may receive the 3D map data and the 3D object detail information through the broadcast receiving module 111 connected to the broadcast receiving channel, and store the data in the memory 160.
The mobile communication module 112 transmits and receives a radio signal with at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data, such as voice call signal, video call signal, or text / multimedia message transmission and reception.
The wireless internet module 113 refers to a module for wireless internet access. The wireless internet module 113 may be embedded or external to the mobile terminal 100. Wireless Internet technologies may include Wireless LAN (Wi-Fi), Wireless Broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), and the like.
The short range communication module 114 means a module for short range communication. As a short range communication technology, Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, etc. may be used.
The location information module 115 is a module for confirming or obtaining the location of the mobile terminal. A representative example of the location information module is a GPS (Global Position System) module. According to the current technology, the GPS module 115 calculates information about a distance of a point (object) from three or more satellites, and information on a time at which the distance information is measured, and then applies a trigonometric method to the calculated distance information. By applying, three-dimensional positional information according to latitude, longitude, and altitude of one point (object) in one time can be calculated. Furthermore, a method of calculating position and time information using three satellites and correcting the error of the calculated position and time information using another satellite is also used. The GPS module 115 may continuously calculate the current position in real time and use the same to calculate speed information.
The A / V input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video call mode or the photographing mode. The processed image frame may be displayed on the display module 151.
The image frame processed by the camera 121 may be stored in the memory unit 160 or transmitted to the outside through the wireless communication unit 110. Two or more cameras 121 may be disposed in the mobile terminal 100.
The microphone 122 receives an external sound signal by a microphone in a call mode, a recording mode, a voice recognition mode, etc., and processes the external sound signal into electrical voice data. The processed voice data may be converted into a form transmittable to the mobile communication base station through the mobile communication module 112 and output in the call mode. The microphone 122 may implement various noise removing algorithms for removing noise generated in the process of receiving an external sound signal.
The user input unit 130 generates input data for the user to control the operation of the terminal. The user input unit 130 may include a key pad, a dome switch, a touch pad, a jog wheel, a jog switch, and the like. In addition, the user input unit 130 may include a trackball, a joystick, and the like.
The sensing unit 140 may be a mobile terminal 100 such as an open / closed state, a location of the mobile terminal 100, a user contact, a bearing of the mobile terminal, an acceleration / deceleration of the mobile terminal, a change in posture and angle of the mobile terminal, and the like. The current state of the sensor 100 is sensed to generate a sensing signal for controlling the operation of the mobile terminal 100. In addition, the sensing unit 140 may generate a sensing signal related to whether the power supply unit 190 supplies power or whether the interface unit 170 is coupled to an external device.
The sensing unit 140 may include a touch screen including a touch sensor embedded in the display module 151 or stacked on the display module 151, the presence or absence of an object within a recognized proximity distance on the display module 151 or the touch screen, and It may include a proximity sensor for detecting the movement or gesture of the object. In addition, the sensing unit 140 may include a gyro sensor, a geomagnetic sensor, or the like that detects a change in posture, azimuth, and angle of the mobile terminal 100.
The output unit 150 is used to generate an output related to visual, auditory, or tactile, and may include a display module 151, an audio output module 152, an alarm unit 153, and a haptic module 154. have.
The display module 151 displays and outputs information processed by the mobile terminal 100. For example, the display module 151 may display a user interface (UI), a 2D and a 3D graphic user interface (GUI), and the like under the control of the controller 180. When the mobile terminal 100 is in a video call mode or a photographing mode, the display module 151 may display an image photographed by the camera 121 or an image received through the wireless communication unit 110.
The display module 151 includes a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT LCD), an organic light emitting diode (OLED), a flexible display, 3 It may include at least one of a 3D display.
The display module 151 may be configured to be transparent or light transmissive so that the outside can be seen through the display panel. In this case, the user may see an object located behind the terminal body through the area occupied by the display module 151 of the mobile terminal body.
The display module 151 may include two or more display modules that are physically or logically divided. For example, the plurality of display modules 151 may be spaced apart or integrally disposed on one surface of the mobile terminal 100, or may be disposed on different surfaces. The touch screen may be implemented in a form in which a touch sensor is stacked on the display module 151 or a touch sensor is embedded in the display module 151. The touch screen may be used as an input device that receives a user input in addition to the image output device.
The touch sensor may be configured to convert a change in pressure applied to a specific portion of the display unit 151 or capacitance generated in a specific portion of the display unit 151 into an electrical input signal. The touch sensor may be configured to detect not only the position and area of the touch but also the pressure at the touch. When there is a touch input to the touch sensor, the signal (s) corresponding thereto are transmitted to the touch signal processing module (not shown) of the controller 180. The touch signal processing module calculates the coordinates of the touch point from the touch signal and transmits the coordinates of the touch point to the controller 180. Thus, the controller 180 can know which point is touched on the touch screen. When the touch sensor is implemented as a capacitive touch sensor, the proximity of the pointer may be sensed by the change of the electric field according to the proximity of the pointer. In this case, the touch screen may be classified as a proximity sensor.
The proximity sensor may be disposed inside the mobile terminal 100 or near the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or an object present in the vicinity without using a mechanical contact by using an electromagnetic force or infrared rays. Proximity sensors have a longer life and higher utilization than touch sensors. The proximity sensor may be a transmission photoelectric sensor, a direct reflection photoelectric sensor, a mirror reflection photoelectric sensor, a high frequency oscillation proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, an infrared proximity sensor, or the like.
The proximity sensor senses proximity touch and proximity touch patterns (eg, proximity touch distance, proximity touch direction, proximity touch speed, proximity touch time, proximity touch position, proximity touch movement state, and the like). Information corresponding to the sensed proximity touch operation and the proximity touch pattern may be output on the touch screen.
The sound output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory unit 160 in a call signal reception, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, and the like. The sound output module 152 outputs an acoustic signal related to a function (e.g., a call signal reception sound, a message reception sound, etc.) performed in the mobile terminal 100. The sound output module 152 may include a receiver, a speaker, a buzzer, and the like.
The alarm unit 153 outputs a signal for notifying occurrence of an event of the mobile terminal 100. Examples of events occurring in the mobile terminal include call signal reception, message reception, email reception, key signal input, touch input, and proximity input. The alarm unit 153 may output a signal for notifying occurrence of an event in a form other than a video signal or an audio signal, for example, vibration. The video signal or the audio signal may also be output through the display unit 151 or the sound output module 152.
The haptic module 154 generates various tactile effects that a user can feel. Vibration is a representative example of the haptic effect generated by the haptic module 154. The intensity and pattern of the vibration generated by the haptic module 154 are controllable. For example, different vibrations may be synthesized and output or may be sequentially output. In addition to vibration, the haptic module 154 has the effect of stimulation by the arrangement of pins vertically moving with respect to the contact skin surface, the effect of stimulation through the injection force or the suction force of air through the injection or inlet, and the effect by the stimulus that rubs the skin surface. Various effects of tactile sensation may be generated, such as an effect of stimulation through contact of an electrode, an effect of stimulation using an electrostatic force, and an effect of reproducing a sense of cold and warm using an endothermic or heat generating element. The haptic module 154 may not only deliver the haptic effect through direct contact, but also may realize the haptic effect through the muscle sense of the user's finger or arm.
The memory 160 may store a program for processing various control operations of the controller 180, an application of various software formats, and the like, and may include an input / output phone book (or phone book), a message, and the like under the control of the controller 180. You can store data such as emails, photos, and videos. The memory 160 may store data regarding various sound effects, vibration patterns, and haptic patterns generated when a user input or an event occurs. The memory 160 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), RAM (Random access memory), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM) magnetic memory, magnetic disk, optical disk It may include one storage medium. The mobile terminal 100 may operate in association with a web storage that performs a storage function of the memory 160 on the Internet.
The interface unit 170 serves as a path with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or receives power from the external device to transfer the data to each component in the mobile terminal 100 or to transmit data in the mobile terminal 100 to an external device. For example, wired / wireless headset port, external charger port, wired / wireless data port, memory card port, identification module card port, audio input / output (I / O) port, video I / O (Input / Output) port, earphone port may be included in the interface unit 170. When the mobile terminal 100 is connected to an external cradle, the interface unit 170 becomes a passage through which power from the cradle is supplied to the mobile terminal 100, or various command signals input from the cradle are moved by a user. It may be a passage that is delivered to the terminal 100. Various command signals or power input from the cradle may be operated as signals for recognizing that the mobile terminal 100 is correctly mounted on the cradle.
The identification module is a chip that stores various information for authenticating the use authority of the mobile terminal 100, and includes a user identification module (UIM), a subscriber identify module (SIM), and a universal user authentication module (SIM). Universal Subscriber Identity Module (USIM), and the like. The identification module may be manufactured in the form of a smart card. The identification module may be connected to the terminal 100 through the identification module port of the interface unit 170. The identification module stores a phone number, call information, billing information, and the like.
The controller 180 controls the overall operation of the mobile terminal 100. For example, control and processing related to voice call, data communication, video call, message transmission and reception are performed. The controller 180 may include a 3D image processing module (not shown) and a multimedia module 181. The 3D image processing module converts 3D data such as 3D map data and 3D user interface data into 3D images, and displays the 3D displayed on the display module 151 according to a direction change command or an angle change of the mobile terminal 100 according to a user input. Adjust the angle, size, etc. of the image. The multimedia module 181 is responsible for signal processing for reproduction of multimedia data. The controller 180 may perform pattern recognition processing for recognizing a writing input or a drawing input performed on a touch screen as text and an image, respectively.
The power supply unit 190 receives an external power source and an internal power source under the control of the controller 180 to supply power for operation of each component.
Various embodiments described herein may be implemented in a recording medium readable by a computer or similar device using, for example, software, hardware or a combination thereof.
According to a hardware implementation, the embodiments described herein may include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs). It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing functions. In some cases such embodiments may be implemented by the controller 180.
In a software implementation, embodiments such as procedures or functions may be implemented with separate software modules that allow at least one function or operation to be performed. The software code may be implemented by a software application written in a suitable programming language. In addition, the software codes may be stored in the memory 160 and executed by the control unit 180. [
2A and 2B are perspective views illustrating an example in which the mobile terminal 100 is implemented as a slide type mobile terminal.
2A and 2B, a slide type mobile terminal according to an embodiment of the present invention includes a first body 10 and a second body 20 slidably fastened to the first body 10. .
Hereinafter, a state in which the first body 10 overlaps the second body 20 is defined as a slide down state (or closed configuration, retracted position), and as shown in FIGS. 1 and 2, the first body 10 may be A state in which at least a portion of the second body 20 is exposed from the second body 20 and is exposed is defined as a slide up state (or open configuration, extended use position). The mobile terminal mainly operates in the standby mode in the slide down state, but the standby mode may be released by a user's operation. The mobile terminal mainly operates in a call mode or the like in the slide-up state, but may be switched to the standby mode by a user's manipulation or a lapse of a predetermined time.
The case (or casing, housing, cover, etc.) forming the exterior of the first body 10 includes a front case 11 and a rear case 12. A slide PCB is embedded in the space formed by the front case 11 and the rear case 12. At least one intermediate case may be further disposed between the front case 11 and the rear case 12. The cases may be manufactured by injecting a synthetic resin or by processing a metal material, for example, a stainless steel (STS) or a titanium (Ti) by a mechanical processing method.
The front case 11 may include a display module 13, a first sound output module 14, a first camera 15, and a first manipulation unit 16 of the user input unit 130. The display module 13 may include a liquid crystal display (LCD) module, an organic light emitting diode (OLED) module, and the like that visually express information. The display module 13 may be configured as a touch screen combined with a touch sensor and a proximity sensor to sense a touch input or a proximity input. In this case, the display module 13 may output user information together with output means for outputting a video signal. It also serves as an input means for receiving input. The first sound output module 14 includes a receiver or a speaker to output an audio signal. The first camera 15 includes a camera module for capturing a picture (image) or a video in front of the mobile terminal.
In the second body 20, a main PCB to which the antenna 43 is connected is embedded between the front case 21 and the rear case 22. The slide PCB embedded in the first body 10 and the main PCB embedded in the second body 20 are electrically connected through the flexible circuit board. The flexible circuit board includes at least one of a flexible printed circuit board (FPCB), a flexible wire (FW), and a flexible circuitry (FC). In the flexible circuit board, a plurality of slits are formed as shown in the example of FIGS. 5, 6, and 12 in order to prevent the characteristic change of the antenna 43 in the slide up state and the slide down state.
The second manipulation unit 23 of the user input unit 130 may be disposed on the front surface of the front case 21.
The third manipulation unit 24, the first microphone 25, and the interface unit 26 of the user input unit 130 may be disposed on at least one of the front case 21 and the rear case 22. The first to third manipulators 16, 23, and 24 may be collectively referred to as manipulating portions, and may be employed in any manner as long as the user is tactile in a tactile manner. For example, the operation unit may be implemented as a dome switch or touch screen that can receive a command or information by a user's push or touch operation as described above, a touch pad, or a wheel or jog method or a joystick that rotates a key. It can also be implemented in the manner of operation.
The user may input a command such as start, end, scroll, etc. through the first manipulation unit 16, and input a number, a letter, a symbol, etc. through the second manipulation unit 23. The third operation unit 24 may operate as a hot key for performing a special function such as activation of the first camera 15.
The rear case 22 is equipped with a power supply unit 27 for supplying power to the mobile terminal. The power supply 27 includes a rechargeable battery, a battery protective cover, and the like. The battery is connected to the power input terminal of the main PCB passing through the rear case 22.
In the second body 20, a second camera 28 may be additionally mounted on the rear surface of the rear case 22. The second camera 28 faces the rear photographing direction of the mobile terminal substantially opposite to the first camera 15. The second camera 28 may include a camera having different pixels from the first camera 15. For example, the first camera 15 may use a low-pixel camera so that the user's face is photographed and transmitted to the counterpart in case of a video call, and the second camera 28 captures a general subject. In many cases, high-resolution cameras can be used.
A flash 29 and a mirror portion 30 may be further disposed on the rear surface of the rear case 22. The flash 29 illuminates the subject when the subject is photographed by the second camera 28. The mirror unit 30 allows the user to see the user's own face or the like when photographing (self-taking) the user using the second camera 28.
The second sound output module 31 may be additionally disposed in the rear case 22. The second sound output module 31 may implement a stereo function together with the first sound output module 14 and may be used for a call in the speakerphone mode.
An antenna 32 for receiving a broadcast signal may be disposed on one side of the rear case 22 in addition to an antenna for a call or the like. The broadcast receiving antenna 32 may be installed to be pulled out of the second body 20.
A portion of the slide module 33 that slidably couples the first body 10 and the second body 20 to the rear case 12 side of the first body 10 is disposed. The other part of the slide module 33 is disposed on the front case 21 side of the second body 20.
Although the second camera 28 or the like has been described as being disposed on the second body 20, it is not necessarily limited thereto. For example, at least one or more of the components 28 to 32 described as being disposed on the rear case 22, such as the second camera 28, may be disposed on the first body 10. In the mobile terminal, the second camera 28 may be omitted, and the first camera 15 may be rotatably formed so as to allow shooting up to the shooting direction of the second camera 28.
The display module 13, the audio output modules 14 and 31, the driving circuit of the first camera 15, and the like are mounted on the slide PCB embedded in the first body 10, and are connected to the first operation unit 16. . The main PCB embedded in the second body 20 has a wireless communication unit 110, a second camera 28, a sensing unit 140, an interface unit 170, a memory 160, and a power supply connected to the antenna 43. Circuits such as the supply unit 27 and the control unit 180 are mounted, and are connected to the first microphone 25 and the operation units 23 and 24.
3 is a longitudinal cross-sectional view illustrating a slide down state in a slide type mobile terminal, and FIG. 4 is a perspective view illustrating an up state in a slide type mobile terminal.
3 and 4, the flexible circuit board 44 is connected to the slide PCB 41 through the first connector 45 and to the main PCB 42 through the second connector 46. . The flexible circuit board 44 is formed of a flexible material and bent during the slide up / down operation to maintain the electrical connection state between the slide PCB 41 and the main PCB 42 without interfering with the slide operation.
5 shows the structure of a typical flexible printed circuit board 44.
Referring to FIG. 5, a general flexible circuit board 44 includes a first flexible substrate portion 44a and a second flexible substrate portion 44b separated through slots 44d. The first flexible board portion 44a is connected to the slide PCB 41 through the first connector 45, and the second flexible board portion 44b is connected to the main PCB 42 through the second connector 46. do. However, in the slide type mobile terminal in which the slide PCB 41 and the main PCB 42 are connected to each other through the flexible circuit board 44 as illustrated in FIG. 5, the antenna characteristic changes in the slide up / down operation as shown in FIGS. 6 and 7. In detail, the slide type mobile terminal slides as shown in the E-field simulation result of FIG. 6 due to the current flowing through the metal surface embedded in the first body 10 such as the display module 13. In the up state, the coupling between the metal of the first body 10 and the antenna 43 occurs electrically, so that the input impedance of the antenna 43 is changed so that the electric field is greatly changed in the vicinity of the antenna. As a result, antenna characteristics such as resonance frequency, bandwidth, antenna gain, and the like vary in the slide down state and the slide up state. As shown in FIG. 7, the resonance frequency greatly changes according to the slide up / down state. When the antenna 43 is installed on the upper end of the second body 20, the resonance frequency changes a lot when the slide up state, and when the antenna is installed on the lower end of the second body 20, when the slide down state The spatial frequency changes a lot. That is, when the overlapping area between the antenna 43 and the metal such as the display module 13 included in the first body 10 is widened, the resonance frequency changes a lot. In FIG. 7, the dummy resonance frequency is a resonance frequency generated by the display module 13 embedded in the first body 10, for example, the LCD module.
The present invention applies the flexible circuit board 44 as shown in FIG. 8 without changing the antenna volume or the ground of the first body 10 in order to improve the antenna characteristics that vary during the slide up / down operation in the slide type mobile terminal. Reduces the ground influence of the first body (10) / down.
Referring to FIG. 8, the flexible circuit board 44 of the present invention may include a first flexible board part 44a connected to the slide PCB 41, a second flexible board part 44b connected to the main PCB 42, The dummy flexible substrate portion 44c, the first slot 44d separating the first flexible substrate portion 44a and the second flexible substrate portion 44b, and the second flexible substrate portion 44b and the dummy flexible substrate portion ( And a second slot 44e for separating 44c.
The dummy flexible board portion 44c includes a metal wire through which current can flow and overlaps the antenna 43 without being shorted with the antenna 43. As shown in FIG. 9, the dummy flexible board part 44c disperses the current i flowing through the flexible circuit board 44 and changes the phase of the current i so as to electrically couple the antenna 43 and the flexible circuit board 44. Reduce the amount of ring Looking at the current i flowing in the flexible circuit board 44, the current i flowing in the first flexible substrate portion 44a and the dummy flexible substrate portion 44c is the current flowing in the second flexible substrate portion 44b. The direction is opposite to (i). The current flowing through the flexible circuit board 44 and the current i flowing through the antenna 43 are perpendicular to each other as shown in FIG. 9, so that the amount of electrical coupling between the antenna 43 and the flexible circuit board 44 is minimized. .
The shape of the dummy flexible substrate 44c may vary depending on the shape of the antenna 43. In other words, since the direction of the current flowing through the dummy flexible substrate portion 44c should be perpendicular to the direction of the current flowing through the antenna 43, when the shape of the antenna is changed, the shape of the dummy flexible substrate portion 44c may be different. Therefore, the shape of the dummy flexible substrate portion 44c and the second slot 44e is not limited to FIGS. 8 and 9.
In FIG. 9, reference numerals 43a and 43b denote a feeding pin and a short pin connected to the connector of the main PCB at the antenna 43.
10 to 13 are simulation results confirming antenna characteristic changes in a slide up / down operation by applying the flexible circuit board 44 as shown in FIG. 8 to a slide type mobile terminal. As shown in the electric field simulation result of FIG. 10, the slide type mobile terminal to which the flexible circuit board 44 as shown in FIG. 8 is applied, is electrically connected between the antenna 43 and the metal surface of the first body 10 even in the slide-up state. Because the coupling does not increase significantly, the antenna characteristics hardly change with slide up / down. In addition, in the slide type mobile terminal to which the flexible circuit board 44 as shown in FIG. 8 is applied, the resonance frequency hardly changes in the slide up / down state as shown in FIG.
According to the experiment, the characteristics of the antenna 43 are sensitively changed depending on the length L1 of the second slot 44e shown in FIG. 8. Therefore, if the length L1 of the second slot 44e is adjusted, the resonance characteristics can be adjusted in the slide up / down state, and the resonance characteristics of the antenna are equally controlled as shown in FIG. 11 in the slideless / down state. can do. The length from the feeding point of the antenna 43 to the end of the second slot 44e (arrow length in bold lines in FIG. 9) is 1/4 of the propagation wavelength λ determined by the mobile communication frequency. When the length L1 of the second slot 44e is adjusted to L1 = 20 mm so as to be about λ / 4, the metal of the antenna 43 and the first body 10 as shown in FIGS. 12 and 13 (2). The electrical coupling between the planes can be minimized to make the resonant frequency the same in the slide up / down operation. On the other hand, if the length from the feed point of the antenna 43 to the end of the second slot 44e is smaller than λ / 4, the antenna 43 and the first body 10 as shown in Figs. 12 and 13 (1). The amount of coupling between the metal surfaces cannot be sufficiently reduced, and if the length is longer than λ / 4, the improvement effect is not good as the length increases.
14 illustrates a flexible circuit board 44 according to another embodiment of the present invention.
Referring to FIG. 14, the flexible circuit board 44 of the present invention includes first and second flexible substrate portions 44a and 44b separated by slots 44d. The structure of the flexible printed circuit board 44 is substantially the same as the general flexible printed circuit board shown in FIG. The flexible circuit board 44 is connected to the metal body 12a through the conductive tape 55.
The metal body 12a is formed on the inner side of the metal formed on the first body 10, for example, on the metal bracket, hinge, and rear case 12 of the display module 13 opposite the slide PCB 41. It may be implemented as a metal film formed and the like. Examples of the metal film formed on the rear case 12 include an electro-magnetic interference (EMI) metal shielding film or a metal paint (metal paint). Therefore, the metal body 12a may be used as a metal material formed in the existing first body without having to be added to the mobile terminal as a separate component. The conductive tape 55 connects the second flexible substrate portion 44b of the flexible circuit board 44 to the metal body 12a to form a current path between the flexible circuit board 44 and the metal body 12a. It is a sieve. The conductive tape 55 forms a slot between the metal body 12a and the flexible circuit board 44.
The organic connection structure of the flexible circuit board 44, the conductive tape 55, and the metal body 12a shown in FIG. 14 may have an effect similar to that of the flexible circuit board 44 shown in FIGS. 8 and 9. That is, the metal body 12a disperses the current flowing through the flexible circuit board 44 and changes the phase of the current to reduce the amount of electrical coupling between the antenna 43 and the flexible circuit board 44. For this purpose, the slot length between the feed point of the antenna 43 and the conductive tape 55 should be about λ / 4.
As a result, the present invention provides a first body 10 in which a slide PCB is embedded and a main PCB and an antenna 43 in order to improve deviation of antenna characteristics according to a slide up / down state in a slide type mobile terminal. 2 The antenna 43 and the metal of the first body may be changed by changing the structure of the flexible circuit board connecting the body 20 or by connecting one side of the existing flexible circuit board to a metal body (or a separate metal body) of the first body. Electrical coupling between faces can be minimized.
The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.
