WO2015056834A1

WO2015056834A1 - Mobile terminal

Info

Publication number: WO2015056834A1
Application number: PCT/KR2013/010279
Authority: WO
Inventors: 신충환; 이아름; 김진수
Original assignee: 엘지전자 주식회사
Priority date: 2013-10-17
Filing date: 2013-11-13
Publication date: 2015-04-23
Also published as: KR20150044560A

Abstract

A mobile terminal comprises: a case having a first pattern provided with a transparent part and an opaque part on one surface thereof; a pattern film located at the inner side of the one surface of the case and having a second pattern; a bidirectional shape memory alloy of which one side is coupled to the pattern film and of which the other side is coupled to the case, and which is deformed to have a first length at a first temperature and deformed to have a second length at a second temperature; and a power source for applying a current to the bidirectional shape memory alloy, wherein if the current is applied to the bidirectional shape memory alloy, the length of the bidirectional shape memory alloy changes, and the pattern film moves. Since a moving image can be applied to the rear surface of the mobile terminal by using the bidirectional shape memory alloy, a notification message can be delivered to a user without the need for driving a display unit, and quality of an exterior design of the mobile terminal can be improved through the moving image.

Description

Mobile terminal

The present invention relates to a mobile terminal having a changing image on the back side.

Terminal can move It may be divided into a mobile terminal (portable terminal) and a stationary terminal according to whether or not. The mobile terminal may be further classified into a handheld terminal and a vehicle mount terminal according to whether a user can directly carry it.

As the terminal functions are diversified, for example, such a terminal is a multimedia player having a complex function such as taking a picture or a video, playing a music or video file, playing a game, or receiving a broadcast. Is being implemented.

The back of the mobile terminal is generally covered with a battery cover or a rear case and is flat and does not have any function except that the camera is exposed to the back. Research on improving the design of the rear space and expanding the function of the mobile terminal using the rear surface has been conducted.

The present invention is proposed to meet the above-described needs, and an object of the present invention is to provide a mobile terminal using a changing image on the back of the mobile terminal using a bidirectional shape memory alloy.

A case including a first pattern including a transparent part and an opaque part on one surface; A pattern film positioned inside one surface of the case and including a second pattern; One side is coupled to the pattern film and the other side is coupled to the case, the bidirectional shape memory alloy is deformed to the first length at a first temperature and the second length at a second temperature; And a power source for applying current to the bidirectional shape memory alloy, and when a current is applied to the bidirectional shape memory alloy, the length of the bidirectional shape memory alloy is changed and the pattern film moves.

And a pivot for rotatably coupling one side of the pattern film to the case, wherein the bidirectional shape memory alloy is coupled with the pattern film at a position spaced apart from the pivot, according to a change in length of the bidirectional shape memory alloy. The pattern film may be rotated about the pivot.

The first temperature may be higher than the second temperature, and the first length may be shorter than the second length.

The first temperature may be 50 ° C. or more, and the second temperature may be less than 50 ° C.

Further comprising a guide extending in accordance with the movement direction of the pattern film, the pattern film may move along the guide when the length of the bidirectional shape memory alloy changes.

The bidirectional shape memory alloy may be stretched when contracted, and the bidirectional shape memory alloy may be further contracted when tensioned to move the pattern film.

The first pattern and the second pattern may have a shape in which the same figure is repeated.

The second pattern includes an image pattern consisting of a plurality of pieces representing a picture or a character, and a shadow pattern filling between the image patterns. When the bidirectional shape memory alloy is a first length, the message pattern is the first pattern. Located in the transparent portion of the first pattern, when the bidirectional shape memory alloy is a second length, the shadow pattern may be located in the transparent portion of the first pattern.

The power source may apply a current to the bidirectional shape memory alloy when a notification event occurs.

The power source may apply a current to the bidirectional shape memory alloy in a pulse waveform.

The power supply may further include a capacitor for storing charge.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

2 is a front perspective view of a mobile terminal according to an embodiment of the present invention.

3A and 3B are rear perspective views of a mobile terminal according to an embodiment of the present invention.

4 is an exploded perspective view of FIG. 3A.

5A and 5B illustrate an embodiment of an inner side surface of the rear cover of FIG. 3A.

6 and 7 illustrate another embodiment of the inner side of the rear cover of FIG. 3A.

8 is an exploded perspective view of a mobile terminal according to another embodiment of the present invention.

9A and 9B illustrate an embodiment of an inner side surface of the rear cover of FIG. 8.

10A and 10B illustrate another embodiment of the inner side of the rear cover of FIG. 8.

11 is an exploded perspective view of a mobile terminal according to another embodiment of the present invention.

12A and 12B illustrate an embodiment of a rear surface of the mobile terminal of FIG. 11.

13A and 13B illustrate an embodiment of an inner side surface of the rear cover of FIG. 11.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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.

Hereinafter, a mobile terminal according to an exemplary embodiment of the present invention will be described in detail with reference to the drawings. The same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

The mobile terminal described herein may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, and the like.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein may also be applied to fixed terminals such as digital TVs, desktop computers, etc., except when applicable only to mobile terminals.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention. 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, a memory 160, and an interface. The unit 170, the controller 180, and the power supply unit 190 may be included. The components shown in FIG. 1 are not essential, so that a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

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 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. Two or more broadcast receiving modules may be provided to the mobile terminal 100 for simultaneous broadcast reception or switching of broadcast channels for at least two broadcast channels.

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 associated information refers to information related to a broadcast channel, a broadcast program, or a broadcast service provider. The broadcast related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast related information may exist in various forms. For example, it may exist 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 signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 112 may include at least one of a base station, an external terminal, and a server on a mobile communication network such as, but not limited to, global transparent parent for mobile communications (GSM), code division multiple access (CDMA), and wideband CDMA (WCDMA). Send and receive wireless signals. The wireless signal may include various types of data according to transmission and reception of a voice call signal, a video call call signal, or a text / multimedia message.

The wireless internet module 113 refers to a module for wireless internet access and may be embedded or external to the mobile terminal 100. Wireless Internet technologies include Wireless LAN (Wi-Fi), Wireless Broadband (Wibro), World Interoperability for Microwave Access (Wimax), High Speed Downlink Packet Access (HSDPA), GSM, CDMA, WCDMA, Long Term Evolution), but is not limited to such.

In view of the fact that the wireless Internet access by Wibro, HSDPA, GSM, CDMA, WCDMA, LTE, etc. is made through a mobile communication network, the wireless Internet module 113 for performing a wireless Internet access through the mobile communication network is the mobile communication module. It can be understood as a kind of (112).

The short range communication module 114 refers to 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, and the like may be used.

The location information module 115 is a module for obtaining a location of a mobile terminal, and a representative example thereof is a GPS (Global Position System) module. According to the current technology, the GPS module 115 calculates distance information and accurate time information away from three or more satellites, and then applies trigonometric methods to the calculated information, thereby providing three-dimensional chords according to latitude, longitude, and altitude. The location information can be calculated accurately.

Referring to FIG. 1, 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 unit 151.

The image frame processed by the camera 121 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. Two or more cameras 121 may be provided according to the use environment.

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 button 136 and a touch sensor (static pressure / capacitance) 137 positioned on the front, rear, or side surfaces of the mobile terminal 100, and although not shown, a keypad (key pad) ), A dome switch, a jog wheel, and a jog switch may be further included.

The sensing unit 140 detects a current state of the mobile terminal 100 such as an open / closed state of the mobile terminal 100, a location of the mobile terminal 100, presence or absence of a user contact, orientation of the mobile terminal, acceleration / deceleration of the mobile terminal, and the like. To generate a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it may sense whether the slide phone is opened or closed. In addition, whether the power supply unit 190 is supplied with power, whether the interface unit 170 is coupled to the external device may be sensed. The sensing unit 140 may include a proximity sensor 141. (The proximity sensor will be described later.)

The output unit 150 is used to generate an output related to sight, hearing, or tactile sense, and includes a display unit 151, an audio output module 152, an alarm unit 153, and a haptic module 154. Can be.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, when the mobile terminal is in a call mode, the mobile terminal displays a user interface (UI) or a graphic user interface (GUI) related to the call. When the mobile terminal 100 is in a video call mode or a photographing mode, the mobile terminal 100 displays a photographed and / or received image, a UI, and a GUI.

The display unit 151 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (flexible). and at least one of a 3D display.

Some of these displays can be configured to be transparent or light transmissive so that they can be seen from the outside. This may be referred to as a transparent display. A representative example of the transparent display may be a transparent OLED (TOLED). The rear structure of the display unit 151 may also be configured as a light transmissive structure. With this structure, the user can see the object located behind the terminal body through the area occupied by the display unit 151 of the terminal body.

There may be two or more display units 151 according to the implementation form of the mobile terminal 100. For example, a plurality of display units may be spaced apart or integrally disposed on one surface of the mobile terminal 100, or may be disposed on different surfaces, respectively.

When the display unit 151 and the touch sensor 137 form a mutual layer structure or are integrally formed (hereinafter referred to as a touch screen), the display unit 151 may also be used as an input device in addition to an output device. Can be. For example, when the touch sensor 137 has a form of a touch film, a touch sheet, or a touch pad, the touch sensor 137 may be stacked on the display unit 151 to form a layer structure. It can be made integrally by including.

The touch sensor 137 may be configured to convert a change in pressure applied to a specific portion of the display unit 151 or capacitance generated at a specific portion of the display unit 151 into an electrical input signal. The touch sensor 137 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 137, the corresponding signal (s) is sent to a touch controller (not shown). The touch controller processes the signal (s) and then transmits the corresponding data to the controller 180. As a result, the controller 180 can know which area of the display unit 151 is touched.

The proximity sensor 141 may be disposed in an inner region of the mobile terminal surrounded by the touch screen 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.

Examples of the proximity sensor include 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, and an infrared proximity sensor. When the touch screen is capacitive, the touch screen is configured to detect the proximity of the pointer by the change of the electric field according to the proximity of the pointer. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

The sound output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory 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 may also output a sound signal related to a function (eg, 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, key signal input, and touch 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. Since the video signal or the audio signal may be output through the display unit 151 or the sound output module 152, in this case, the display unit 151 and the sound output module 152 may be a kind of alarm unit 153. May be classified.

The haptic module 154 generates various haptic 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 vibration generated by the haptic module 154 can be controlled. For example, different vibrations may be synthesized and output or may be sequentially output.

In addition to the vibration, the haptic module 154 may be used for stimulation such as a pin array vertically moving with respect to the contact skin surface, a jetting force or suction force of air through an injection or inlet, grazing to the skin surface, contact of an electrode, and electrostatic force. Various tactile effects can be generated, such as effects by the endothermic and the reproduction of a sense of cold using the elements capable of endotherm or heat generation.

The haptic module 154 may not only deliver the haptic effect through direct contact, but also may implement the user to feel the haptic effect through a muscle sense such as a finger or an arm. Two or more haptic modules 154 may be provided according to configuration aspects of the mobile terminal 100.

The memory unit 160 may store a program for processing and controlling the controller 180, and temporarily stores input / output data (for example, a phone book, a message, an audio, a still image, a video, etc.). It can also perform a function for. The memory unit 160 may store a frequency of use of each of the data (eg, a phone number, a message, and a frequency of use of each multimedia).

In addition, the memory unit 160 may store data regarding vibration and sound of various patterns output when a touch input on the touch screen is performed.

The memory 160 may be 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, RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), Magnetic Memory, Magnetic It may include a storage medium of at least one type of disk, optical disk. The mobile terminal 100 may operate in connection 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, receives power, transfers the power to each component inside the mobile terminal 100, or transmits data inside the mobile terminal 100 to an external device. For example, wired / wireless headset ports, external charger ports, wired / wireless data ports, memory card ports, ports for connecting devices with identification modules, audio input / output (I / O) ports, The video input / output (I / O) port, the earphone port, and the like may be included in the interface unit 170.

The identification module is a chip that stores various types of information for authenticating the usage rights of the mobile terminal 100, and includes a user identification module (UIM), a subscriber identify module (SIM), and a universal user authentication module ( Universal Subscriber Identity Module (USIM), and the like. A device equipped with an identification module (hereinafter referred to as an 'identification device') may be manufactured in the form of a smart card. Therefore, the identification device may be connected to the terminal 100 through a port.

The interface unit may be a passage through which power from the cradle is supplied to the mobile terminal 100 when the mobile terminal 100 is connected to an external cradle, or various command signals input from the cradle by a user may be transferred. It may be a passage that is delivered to the terminal. Various command signals or power input from the cradle may be operated as signals for recognizing that the mobile terminal is correctly mounted on the cradle.

The controller 180 typically controls the overall operation of the mobile terminal. For example, perform related control and processing for voice calls, data communications, video calls, and the like. The controller 180 may include a multimedia module 181 for playing multimedia. The multimedia module 181 may be implemented in the controller 180 or may be implemented separately from the controller 180.

The controller 180 may perform a pattern recognition process for recognizing a writing input or a drawing input performed on the 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. The power supply unit 190 may include, for example, a battery, a connection port, a power supply control unit, and a charging monitoring unit.

The battery may be a built-in battery made to be chargeable, and may be detachably coupled to the terminal body for charging. The connection port may be configured as an example of the interface 170 to which an external charger for supplying power for charging the battery is electrically connected.

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 include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and the like. It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions. The described embodiments may be implemented by the controller 180 itself.

According to the software implementation, embodiments such as the procedures and functions described herein may be implemented as separate software modules. Each of the software modules may perform one or more functions and operations described herein. Software code may be implemented in software applications written in a suitable programming language. The software code may be stored in the memory 160 and executed by the controller 180.

2 is a front perspective view of an example of a mobile terminal according to the present invention;

The disclosed mobile terminal 100 has a terminal body in the form of a bar. However, the present invention is not limited thereto and may be applied to various structures such as a slide type, a folder type, a swing type, a swivel type, and two or more bodies are coupled to be relatively movable.

The body of the mobile terminal 100 includes

cases

101 and 102 forming an appearance. In this embodiment, the case may be divided into a front case 101 and a rear case 102. Various electronic components are built in the space formed between the front case 101 and the rear case 102.

In some cases, an electronic component may be mounted on the surface of the rear case 102. Electronic components mounted on the surface of the rear case 102 include a battery, a USIM card, a memory card, and the like, which the user needs to remove. In this case, the rear case 102 may further include a rear cover 103 for covering the surface thereof. The rear cover 103 is formed of a structure that is easily removable by the user, and when the rear cover 103 is removed, the surface of the rear case 102 is exposed.

When the rear cover 103 covers the entire rear surface of the rear case 102, the rear cover 103 may include an opening for exposing the camera 121 ′ or the sound output module 152 ′ to the outside.

The

cases

101, 102, and 103 may be formed by injecting synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti).

A display unit 151, a sound output module 152, a camera 121, a user input unit 130/131, 132, a microphone 122, an interface 170, and the like may be disposed in the

terminal cases

101 and 102.

The display unit 151 occupies most of the main surface of the front case 101. The sound output module 152 and the camera 121 are disposed in regions adjacent to one end of both ends of the display unit 151, and the user input unit 131 and the microphone 122 are disposed in regions adjacent to the other end. The user input unit 132 and the interface 170 may be disposed on side surfaces of the front case 101 and the rear case 102.

The user input unit 130 is manipulated to receive a command for controlling the operation of the mobile terminal 100, and may include a plurality of

manipulation units

131, 132, and 133. The

manipulation units

131, 132, 133 may also be collectively referred to as a manipulating portion.

Content input by the first or

second manipulation units

131 and 132 may be variously set. For example, the first operation unit 131 receives a command such as start, end, scroll, and the like, and the second operation unit 132 inputs a command such as adjusting the volume of the sound output from the sound output module 152. The third manipulation unit 133 may receive a command such as activating / deactivating the touch recognition mode of the display unit 151.

The

operation units

131, 132, and 133 may have a button method for recognizing when a user applies pressure. In addition to the display unit 151, the

operation units

131, 132, and 133 may include a touch sensor 137. Therefore, the user's command may be input only by the user's touch.

3A and 3B are rear perspective views of a mobile terminal according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of FIG. 3A.

3A and 3B, a camera 121 'may be additionally mounted on the rear of the terminal body, that is, the rear case 102. The camera 121 ′ has a photographing direction substantially opposite to that of the camera 121 (see FIG. 2), and may be a camera having the same or different pixels as the camera 121.

For example, the camera 121 has a low pixel so that the user's face is photographed and transmitted to the counterpart in case of a video call, and the camera 121 'photographs a general subject and does not transmit it immediately. It is desirable to have a high pixel because there are many. The cameras 121 and 121 'may be installed in the terminal body so as to be rotatable or pop-up.

The flash 123 and the mirror 124 may be further disposed adjacent to the camera 121 ′. The flash 123 shines light toward the subject when the subject is photographed by the camera 121 '. The mirror 124 allows the user to see his / her own face or the like when photographing (self-photographing) the user using the camera 121 '.

A changing image 221 appears on the back of the mobile terminal of the present invention. The image 221 may appear as shown in FIG. 3B while nothing is shown as shown in FIG. 3A. Alternatively, as shown in FIGS. 12A and 12B, the image 221 of the rear surface may be changed. The image 221 appearing on the back may be a picture representing a specific object or may be an abstract pattern or a letter.

As shown in FIG. 4, the changing image 221 may include a rear cover 103 and a rear cover 103 including a first pattern 210 including a transparent part 211 and an opaque part 212. It is implemented by a pattern film 220 including a second pattern 221 located inside. The rear cover 103 of FIG. 4 has a removable rear cover 103 coupled to the rear surface of the rear case 102 to cover the battery 191. However, when the battery is integrated, the rear cover 103 is not separated. Do not.

According to the position of the second pattern 221 seen through the transparent part 211 of the first pattern 210 as the pattern film 220 moves, the image 221 seen by the user from the back of the mobile terminal is shown in FIGS. 3A and 3B. Or it will be different as shown in Figure 12a and 12b.

To examine in more detail the manner in which the pattern film 220 moves, it will be described with reference to FIGS. 5A and 5B. 5A and 5B illustrate one embodiment of an inner side surface of the back cover 103 of FIG. 3A. The pattern film 220 of the present invention is characterized by moving using the bidirectional shape memory alloy 230.

Two-way shape memory alloy (TWSMA) is a two-way shape memory alloy (TWSMA) that stores a first state at high temperatures, a second state at low temperatures, and forms a first state at high temperatures and a second state at low temperatures. .

When the bidirectional shape memory alloy 230 remembers the shape to be deformed from the first temperature to the first length and from the second temperature to the second length, when the temperature rises and approaches the first temperature, the bidirectional shape memory alloy is deformed to the first length and the temperature As it descends and approaches the second temperature, it gradually deforms to the second length.

In the present embodiment, the first temperature is a high temperature, the second temperature is a low temperature, the first length is described an embodiment using a bidirectional shape memory alloy 230 shorter than the second length, but the length is longer at high temperature and the length at low temperature Short bidirectional shape memory alloy 230 may also be used.

In general shape memory alloys, the shape is stored at a high temperature, and after the shape is changed by an external force or the like, the shape memory alloy is returned to the memorized shape when the shape is stored at the temperature. At this time, even if the temperature is lowered, it does not return to the shape before restoration and is irreversibly deformed.

However, in the case of the bidirectional shape memory alloy 230, the first state and the second state are repeatedly deformed according to temperature, thereby reversibly changing the shape. Therefore, when the temperature of the bidirectional shape memory alloy 230 is changed between the first temperature and the second temperature, the shape (length) of the bidirectional shape memory alloy 230 is reversibly changed.

In this case, the first temperature is preferably about 50 ° C. or more and the second temperature is less than 50 ° C. Although the corresponding temperature varies depending on the thickness of the bidirectional shape memory alloy 230 and the amount of current to be applied, too high temperature is not preferable in terms of durability of the mobile terminal 100, and when used in summer or a high temperature region when the temperature is too low This is because there is a risk of malfunction.

One side of the bidirectional shape memory alloy 230 is coupled to the pattern film 220 and the other side is coupled to the case 103 so that when the length of the bidirectional shape memory alloy 230 changes with temperature, the pattern film 220 is the case. And move relative to 103.

In order to change the length of the bidirectional shape memory alloy 230, the length of the bidirectional shape memory alloy 230 is thinned, so that heat is generated from the nichrome wire, so that both ends are connected to a power source and the bidirectional shape memory alloy 230 is applied. ) Rises quickly.

At room temperature, the length of the bidirectional shape memory alloy 230 is a as shown in FIG. 5A, and when the current flows by applying power to both ends of the bidirectional shape memory alloy 230, the bidirectional shape memory alloy 230 has a first length. As the length of b decreases to b, the position of the pattern film 220 changes as shown in FIG. 5b.

When the bidirectional shape memory alloy 230 is used in multiple directions, the bidirectional shape memory alloy 230 may move in the correct direction. However, since the price of the bidirectional shape memory alloy 230 is high. Therefore, in order to guide the movement of the pattern film 220, the pattern film 220 may further include a guide 250 extending in the moving direction. In the present exemplary embodiment, since the pattern film 220 moves in a straight line, the guide 250 extending in the vertical direction protrudes on both sides of the pattern film 220.

When the power applied to the bidirectional shape memory alloy 230 is removed, the temperature of the bidirectional shape memory alloy 230 is lowered and the length of the bidirectional shape memory alloy 230 tries to return to a. That is, when the length is extended, the pattern film 220 should be returned to its original position, but when the thickness of the bidirectional shape memory alloy 230 is thin, a force is applied to restore the pattern film 220 back to the position shown in FIG. 5A. There is a limit to this.

In order to solve the problem may further include an elastic member 240. The elastic member 240 is the original length in the state in which the bidirectional shape memory alloy 230 is tensioned (FIG. 5A), and the elastic member 240 is tensioned when the bidirectional shape memory alloy 230 is contracted (FIG. 5B). When the bidirectional shape memory alloy 230 is removed to remove the current applied to the bidirectional shape memory alloy 230 as shown in FIG. As the pattern film 220 is restored to the original position.

As the pattern film 220 moves in accordance with the change in the length of the bidirectional shape memory alloy 230 as described above, the second portion of the pattern film 220 is formed through the transparent part 211 of the mobile terminal case as shown in FIGS. 3A and 3B. As the portion of the pattern 221 is changed, the image 221 appears to change.

The controller may notify the user that a new event has occurred by applying power to the bidirectional shape memory alloy 230 to change the back image 221 when an event such as a call or a message arrives.

6 and 7 illustrate another embodiment of the inner surface of the rear cover 103 of FIG. 3A. In this case, the bidirectional shape memory alloy 230 and the elastic member are moved in order to move the pattern film 220 in the vertical direction. 240 is disposed in the vertical direction.

Even if disposed on one side as shown in FIG. 6, the pattern film 220 can be linearly moved up and down without bias due to the guide 250, and when the bidirectional shape memory alloy 230 is connected to two or more places as shown in FIG. 7, one side The pattern film 220 can be stably moved without biasing.

8 is an exploded perspective view of a mobile terminal according to another embodiment of the present invention. The pattern film 220 of the present embodiment is characterized in that the image 221 seen from the back of the mobile terminal changes while rotating about the pivot 225. In particular, when the first pattern 210 and the second pattern 221 is a repetitive pattern composed of repetitive points or repetitive lines, a pattern that changes according to a moire phenomenon may appear depending on the overlapping angle.

9A and 9B illustrate an embodiment of an inner side surface of the rear cover 103 of FIG. 8. It further comprises a pivot 225 coupled to one side of the pattern film 220 to be fixed to the case 103, the pattern film 220 is rotated around the pivot 225.

One end of the bidirectional shape memory alloy 230 is connected to a position spaced apart from the pivot 225 of the pattern film 220, and the other end thereof may be coupled to the case 103 and arranged as shown in FIG. 9A. The pattern film 220 may be formed in a shape including a polygon or a curve in consideration of a moving shape during rotation.

One side of the elastic member 240 to the pattern film 220, the other side to the case 103 so that the pattern film 220 is restored to its original position when the temperature decreases when the bidirectional shape memory alloy 230 is increased to its original state. To combine.

When power is applied and the temperature of the bidirectional shape memory alloy 230 rises and its length decreases as shown in FIG. 9B, the elastic member 240 increases and the pattern film 220 pivots as shown in FIG. 9B. Rotate around. When the power is removed and the temperature of the bidirectional shape memory alloy 230 falls, the force applied to the elastic member 240 by the bidirectional shape memory alloy 230 disappears and the elastic member 240 contracts to restore the state of FIG. 9A. .

10A and 10B illustrate another embodiment of the inner surface of the rear cover 103 of FIG. 8, and another arrangement of the pattern film 220 rotating about the pivot 225 as shown in FIGS. 9A and 9B. It is shown.

In the embodiment of FIG. 10A, the bidirectional shape memory alloy 230 is coupled to a position closer to the pivot 225 than that of FIG. 9A. In this case, even if the length of the bidirectional shape memory alloy 230 is slightly changed, the pattern film 220 may sufficiently rotate. However, in order to apply a larger force, it is necessary to sufficiently secure the thickness of the bidirectional shape memory alloy 230.

11 is an exploded perspective view of a mobile terminal according to another embodiment of the present invention, and FIGS. 12A and 12B are rear views of the mobile terminal of FIG.

In this embodiment, the center of the pattern film 220 is fixed to the case 103 so that the bidirectional shape memory alloy 230 is rotated about the pivot 225, the image of the back of the mobile terminal as shown in Figure 12a and 12b 221 is changed. The second pattern 221 of the pattern film 220 is covered by the opaque portion 212 of the first pattern 210 of the case 103 and exposed to the transparent portion 211, thereby changing the image.

13A and 13B illustrate an embodiment of the back cover 103 of FIG. 11. The center of the pattern film 220 is fixed and spaced apart from the pivot 225, the bidirectional shape memory alloy 230 and the elastic member 240 is connected. At room temperature, when the temperature of the bidirectional shape memory alloy 230 is increased by applying power to the bidirectional shape memory alloy 230, the length of the bidirectional shape memory alloy 230 shrinks as shown in FIG. 13B, and the pattern film 220 is formed. Rotate).

Since the calorific value of the bidirectional shape memory alloy 230 is proportional to the square term, it is difficult to finely control the calorific value. Therefore, the amount of heat generated by controlling the amount of power applied to the bidirectional shape memory alloy 230 by applying a current in a pulse waveform can be adjusted.

In addition, when the current is directly applied from the battery, the overcurrent may flow, so that the current is supplied in a predetermined amount through a capacitor between the power supply and the bidirectional shape memory alloy 230.

As described above, by using the bidirectional shape memory alloy 230, a changing image may be applied to the rear surface of the mobile terminal so that a notification message may be delivered to the user without driving the display unit 151, and through the moving image. It is possible to improve the quality of the appearance design of the mobile terminal.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims

A case including a first pattern including a transparent part and an opaque part on one surface;

A pattern film positioned inside one surface of the case and including a second pattern;

One side is coupled to the pattern film and the other side is coupled to the case, the bidirectional shape memory alloy is deformed to the first length at a first temperature and the second length at a second temperature; And

A power source for applying current to the bidirectional shape memory alloy;

And a current is applied to the bidirectional shape memory alloy, wherein the length of the bidirectional shape memory alloy is changed, and the pattern film is moved.
The method of claim 1,

Further comprising a pivot for rotatably coupling one side of the pattern film to the case,

The bidirectional shape memory alloy is combined with the pattern film at a position spaced apart from the pivot,

And the pattern film rotates about the pivot according to the change in the length of the bidirectional shape memory alloy.
The method of claim 1,

And a first temperature is higher than a second temperature and the first length is shorter than the second length.
The method of claim 1,

The first temperature is at least 50 ℃, the second temperature is less than 50 ℃ mobile terminal.
The method of claim 1,

Further comprising a guide extending in accordance with the movement direction of the pattern film,

The pattern film is a mobile terminal, characterized in that to move along the guide when the length of the bidirectional shape memory alloy changes.
The method of claim 1,

And the bidirectional shape memory alloy is stretched when contracted, and the bidirectional shape memory alloy is contracted when stretched to move the pattern film.
The method of claim 1,

The first pattern and the second pattern is a mobile terminal, characterized in that the same figure is repeated.
The method of claim 1,

The second pattern includes an image pattern consisting of a plurality of pieces representing a picture or a character, and a shading pattern filling the image pattern.

When the bidirectional shape memory alloy is the first length, the message pattern is located in the transparent portion of the first pattern,

And when the bidirectional shape memory alloy has a second length, the shadow pattern is located in a transparent portion of the first pattern.
The method of claim 1,

The power source is a mobile terminal, characterized in that for applying a current to the bidirectional shape memory alloy when a notification event occurs.
The method of claim 1,

The power source is a mobile terminal, characterized in that for applying a current in the pulse waveform to the bidirectional shape memory alloy.
The method of claim 1,

The power supply further comprises a capacitor for storing charge.