KR20130140951A - Dom switch and mobile terminal having the same - Google Patents

Abstract

In a dom switch used in the key switch of a mobile terminal, the dom switch includes a PCB where a switch terminal is formed in an upper surface, a metal dom placed on the switch terminal and transmitting a signal to the switch terminal by an user' touch, and an optical guide bonding film scattering the light supplied from one side, fixing the metal dom to the PCB, and boned to the upper surface of the metal dom. Therefore, PET sheet is omitted, the thickness of the dom switch is reduced, and the cost of materials is reduced by reducing the number of members. The operation force of a key button is 5-25% less than the operation force of an existing key button

Description

Dome switch and mobile terminal having same {Dom Switch and Mobile Terminal having the same}

The present invention relates to a mobile terminal in which the thickness of the dome switch is reduced by reducing the number of members used in the dome switch.

The terminal can move And can be divided into a mobile / portable terminal and a stationary terminal depending on whether the mobile terminal is a mobile terminal or a mobile terminal. The mobile terminal can be divided into a handheld terminal and a vehicle mount terminal according to whether the user can directly carry the mobile terminal.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

Recently, in order to reduce the thickness of the mobile terminal, the number of members of each component of the mobile terminal is reduced, or one member may be improved to perform various functions, thereby decreasing the size of each component.

The present invention provides a dome switch and a mobile terminal having the same by implementing the PET sheet and the optical guide film used in the dome switch by reducing the number of members constituting the dome switch thin.

In order to solve the above problems, the present invention is a dome switch used as a key switch of a mobile terminal, the switch terminal is provided on the upper surface, the switch terminal is located on the switch terminal when pressed by a user signal to the switch terminal It provides a dome switch comprising a metal dome for transmitting, and an optical guide adhesive film adhered to an upper surface of the metal dome to fix the metal dome to the printed circuit board, and scatters the light supplied from one side.

The optical guide adhesive film may further include a scattering pattern formed at a position corresponding to the metal dome.

The light guide tape may further include a light blocking tape formed around the light guide adhesive film.

The apparatus may further include a white sheet interposed between the printed circuit board and the optical guide adhesive film and having an opening formed at a position corresponding to the metal dome.

In this case, the printed circuit board and the white sheet may apply an adhesive on a surface facing the printed circuit board.

Referring to the effects of the dome switch and a mobile terminal having the same according to the present invention.

According to at least one of the embodiments of the present invention, it is possible to omit the PET sheet to reduce the thickness of the dome switch, it is possible to reduce the number of members to reduce the material cost.

In addition, by omitting the PET sheet can be pressed the key button with a force of about 5% to 15% less than the conventional key button has the effect of increasing the operating force of the key button.

In addition, it is possible to solve the problem that the light emitted from the light source is distorted by the PET sheet or the amount of light is reduced.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

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.
3 is an exploded perspective view of a mobile terminal according to an embodiment of the present invention.
4 is an exploded perspective view of a dome switch according to an embodiment of the present invention.
5 is a cross-sectional view of a dome switch according to an embodiment of the present invention.
6 is an exploded perspective view of a dome switch according to another embodiment of the present invention.
7 is a sectional view of a dome switch according to another embodiment of the present invention.
8 is a cross-sectional view of a conventional dome switch.
9 is a cross-sectional view showing a relationship with a light source of a conventional dome switch.

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and navigation. 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 audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, A controller 170, a controller 180, a power supply 190, and the like. The components shown in FIG. 1 are not essential, and 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 for enabling wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and the 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, and a location information module 115 .

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 broadcast channel switching for at least two broadcast channels.

The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information means 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).

For example, the broadcast receiving module 111 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only (Mobile Broadcasting Business Management System), ISDB-T (Integrated Services Digital Broadcasting (ISDB-T)), Digital Multimedia Broadcasting (MBMS) Digital Broadcast-Terrestrial) or the like. Of course, the broadcast receiving module 111 may be adapted to other broadcasting systems as well as the digital broadcasting system described above.

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 be coupled to a base station, an external terminal, or a server on a mobile communication network, such as, but not limited to, Gobal System for Mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband CDMA Transmits and receives wireless signals with one. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. Wireless Internet technologies include WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), GSM, CDMA, WCDMA, LTE Evolution (but not limited to) may be used.

The wireless Internet module 113, which performs wireless Internet access through the mobile communication network, is connected to the mobile communication module 110 through the mobile communication network, for example, from the viewpoint that the wireless Internet access by Wibro, HSDPA, GSM, CDMA, WCDMA, LTE, (112). ≪ / RTI >

The short-range communication module 114 refers to a module for short-range communication. Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like can be used as a short range communication technology.

The position information module 115 is a module for obtaining the position of the mobile terminal, and a representative example thereof is a Global Position System (GPS) module. According to the current technology, the GPS module 115 calculates distance information and accurate time information from three or more satellites, and then applies trigonometry to the calculated information to obtain a three-dimensional string of latitude, longitude, The location information can be accurately calculated. At present, a method of calculating position and time information using three satellites and correcting an error of the calculated position and time information using another satellite is widely used. In addition, the GPS module 115 can calculate speed information by continuously calculating the current position in real time.

Referring to FIG. 1, an A / V (Audio / Video) 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 can 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 depending on the use environment.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. Various noise reduction algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 130 generates input data for a 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 surface of the mobile terminal 100, and include a keypad 250 (key pad). It may be configured to further include a jog wheel, jog switch and the like.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates 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. Meanwhile, the sensing unit 140 may include a proximity sensor 141. (The proximity sensor will be described later).

The output unit 150 is for generating output related to the visual, auditory or tactile sense and includes a display unit 151, an audio output module 152, an alarm unit 153, and a haptic module 154 .

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display unit 151 may also be of a light transmission type. With this structure, the user can see an 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 embodiment of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display portions may be spaced apart from one another, or may be disposed integrally with one another, and may be disposed on different surfaces, respectively.

In the case where the display unit 151 and the touch sensor 137 have a mutual layer structure or are integrally formed (hereinafter referred to as a 'touch screen'), the display unit 151 may be used as an input device . The touch sensor may be stacked on the display unit 151 to form a layer structure when the touch sensor has a form of a touch film, a touch sheet, a touch pad, or the like. ≪ / RTI >

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display unit 151 or a capacitance generated in a specific portion of the display unit 151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller (not shown). The touch controller processes the signal (s) and 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 or in the vicinity of the touch screen, which is enclosed by 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 a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

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. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch" The act of actually contacting the pointer on the touch screen may be referred to as "contact touch. &Quot; The location where the pointer is proximately touched on the touch screen may refer to a position where the pointer corresponds vertically to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected 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 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 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The audio output module 152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. In this case, the display unit 151 and the sound / voice output module 152 may be a kind of the alarm unit 153. The display unit 151 and the sound / . ≪ / RTI >

The haptic module 154 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 154 is vibration. 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 sequentially output.

In addition to the vibration, the haptic module 154 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a touch on the skin surface, contact with an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 154 can be implemented not only to transmit the tactile effect through the direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. At least two haptic modules 154 may be provided according to the configuration of the mobile terminal 100.

The memory unit 160 may store a program for processing and controlling the control unit 180 and temporarily store the input / output data (e.g., telephone directory, message, audio, For example. The memory unit 160 may store the frequency of use of each of the data (for example, each telephone number, each message, and frequency of use for each multimedia).

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

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), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. 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 for communication with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data to the external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 170.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module A Universal Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port.

When the mobile terminal 100 is connected to an external cradle, the interface unit may be a path through which power from the cradle is supplied to the mobile terminal 100, or various command signals input by the user to the cradle may be transmitted It can be a passage to be transmitted to the terminal. The various command signals or the power source input from the cradle may be operated as a signal 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, voice communication, data communication, video communication, and the like. The control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The controller 180 may perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touch screen as characters and images, 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 charge monitoring unit.

The battery may be an internal battery configured to be chargeable, and may be detachably coupled to the terminal body for charging or the like. The connection port may be configured as an example of an interface 170 through which an external charger for supplying power for charging the battery is electrically connected.

The various embodiments described herein may be embodied 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 of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 160 and can be executed by the control unit 180. [

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

The disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, a swing type, and a swivel type in which two or more bodies are relatively movably coupled.

The body of the mobile terminal 100 includes a case 101, 102 which forms an appearance. In this embodiment, the case may be divided into a front case 101 and a rear case 102. [ A variety of electronic components are embedded in the space formed between the front case 101 and the rear case 102.

 In some cases, electronic components may be mounted on the surface of the rear case 102 as well. Electronic components mounted on the surface of the rear case 102 include a battery, a USIM card, a memory card, and the like which are detachable by the user. At this time, the rear case 102 may further include a rear cover for covering the surface thereof. The rear cover is formed in a structure in which the user can easily attach and detach, and the rear cover 102 is exposed when the rear cover is removed.

The cases 101 and 102 may be formed by injection molding of synthetic resin or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The display unit 151, the sound output unit 152, the camera 121, the user input units 130/131 and 132, the microphone 122, and the interface 170 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 unit 152 and the camera 121 are disposed in areas adjacent to one end of both ends of the display unit 151, and the keypad 250 and the microphone 122 are disposed in the area adjacent to the other end as a user input unit. . The side keys 132, the interface 170, and the like 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 132 and 250. The manipulation units 132, 250 may also be referred to collectively as a manipulating portion.

Content input by the operation units 132 and 250 may be variously set. For example, the front keypad 250 may input characters or move a cursor on the screen, and the side key 132 on the side may input a command such as adjusting the volume of the sound output from the sound output unit 152. Can be.

3 is an exploded perspective view of a mobile terminal according to an embodiment of the present invention. Various electronic components may be disposed between the rear case 102 of the rear side and the front case 101 of the front side, and the frame 108 may be disposed inside the case to fix the electronic components.

A keypad 250 having a display unit 151 for outputting an image and a plurality of key buttons 255 for inputting a user's command is disposed in front of the frame.

The user may input letters, numbers, symbols, etc. on the key button 255 of the keypad 250. The key button 255 is a character key 257 for inputting English alphabets, Korean consonants and vowels or numbers, a navigation key 258 for moving the cursor, and performing specific functions such as cancellation, selection, and call. Function key 259 or the like.

When the user presses the key button 255, the dome switch 200 located on the back of the keypad 250 is pressed and the dome switch 200 generates a signal corresponding to each key button 255.

4 is an exploded perspective view of the dome switch 200 according to an embodiment of the present invention, and FIG. 5 is a partial cross-sectional view of the dome switch 200 shown in FIG. 4, and the optical guide adhesive film 230 and the metal dome 220 are shown in FIG. ), A white sheet 240 and a printed circuit board 210 are shown.

The printed circuit board 210 may have a switch terminal 215 formed on an upper surface thereof, and input a signal to the printed circuit board 210 through the switch terminal 215. Accordingly, the switch terminal 215 is formed at positions corresponding to the individual key buttons 255 described above, respectively.

The metal dome 220 is a dome-shaped member having a curved surface, and is disposed one by one between the switch terminal 215 and the key button 255 of the printed circuit board 210. When the key button 255 on the upper portion of the metal dome 220 is pressed, the metal dome 220 is pressed to generate a signal to the switch terminal 215 of the printed circuit board 210.

The metal dome 220 is made of a metal material, and deformed when the key button 255 is pressed and the metal dome 220 also returns to its original shape when the force of pressing the key button 255 is removed.

The upper surface of the metal dome 220 is fixed to the metal dome 220 to the printed circuit board 210, the light emitted from the light source of the side to reach the user's eyes at the position of the individual key button 255 An optical guide adhesive film 230 for controlling the path is provided.

As shown in FIG. 8, the conventional dome switch 200 has a PET sheet 25 coated with an adhesive 28 on a lower surface thereof and an upper surface thereof to bond the metal dome 220 to the printed circuit board 210. The light guide film 30 was laminated. In this case, the optical guide film 30 may be partially spaced apart from the PET sheet 25 and the front surface by applying the adhesive 38 only to the outer portion.

Due to the multiple layers of films 25 and 30 stacked on the upper surface of the metal dome 20, the members are increased, the cost is increased, the number of processes is increased, and the thickness of the mobile terminal is difficult to be reduced. In addition, as shown in FIG. 9, the light emitted from the light source 50 on the side surface is refracted by the PET sheet 25 or there is a problem in that the light emission amount is lowered.

FIG. 9 illustrates a path in which light emitted from the light source 50 positioned at the side of the conventional dome switch 200 moves, and the light moving toward the printed circuit board 10 among the light emitted from the light source 50 ( ①②) is reflected and reaches the user's eye (hereinafter referred to as 'reflected light source'), the amount of light is reduced because the PET sheet 25 must be transmitted once or twice.

The present invention for solving this problem, the optical guide adhesive film 230 serves to guide the light to be visible to the user's eyes from the individual key button 255, the light emitted from the side, the entire surface of the adhesive (238) ) By applying a metal dome 220 may be fixed.

That is, the optical guide adhesive film 230 of the present invention also serves to fix the metal dome 220, and can omit the PET sheet 25 used in the past, thereby reducing the member cost and process have. In addition, since the thickness of the dome switch 200 may be reduced by the thickness of the PET sheet 25 (about 0.11 mm), the overall thickness of the mobile terminal may be reduced.

In addition, unlike the conventional optical guide film 30, the optical guide adhesive film 230 is coated with an adhesive 238 on the entire bottom surface, so that the center part is not adhered like the conventional optical guide film 30, thereby solving the problem of lifting. do.

In addition, since the reflection light source omits the PET sheet 25, the amount of light to be transmitted until the user reaches the eyes of the user is reduced, thereby increasing the amount of light.

The light guide adhesive film 230 has a scattering pattern at a position corresponding to the key button 255 or the metal dome 220 so that the light is changed in the direction of the individual key button 255 to be recognized by the user's eyes. It can be provided. At the position where the scattering pattern is formed, the light is changed in the path and emitted to the front direction of the mobile terminal 100.

The light guide adhesive film 230 may further include a dark shading tape 235 around the light guide. The light shielding tape 235 is provided to prevent light leakage that is emitted through the side of the light guide adhesive film 230 and leaks through the gap of the mobile terminal case. In the drawing, the light blocking tape 235 is formed on the entire circumference of the light guide adhesive film 230, but may be partially formed.

The white sheet 240 is a bright colored film having an opening 242 formed at the position where the metal dome 220 is formed, and then, the adhesive 245 is applied to the bottom surface of the white sheet 240 and attached to the printed circuit board 210. It reflects the light emitted from the light source 250 located on the side of the keypad 250 toward the printed circuit board 210 to change the path of the light to be emitted in the front direction. This is to secure the amount of light emitted in the front direction of the key button 255 by preventing light loss.

The white sheet 240 may prevent light loss by reflecting the light toward the front surface of the mobile terminal 100, but the thickness of the dome switch 200 is increased due to this. The white sheet 240 may be omitted to thin the dome switch 200.

6 and 7 are exploded perspective and sectional views of the dome switch 200 according to another embodiment of the present invention omitting the white sheet 240. Compared to the embodiment illustrated in FIGS. 4 and 5, the white sheet 240 is omitted. By omitting the white sheet 240, the thickness can be reduced by about 0.1 mm, which is the thickness of the white sheet 240.

In the present invention, which eliminates the problem of the PET sheet 25 dropping the amount of reflected light by omitting the PET sheet 25 in the present invention, the problem of low reflectance is omitted by omitting the white sheet 240. It can be supplemented.

That is, the amount of light emitted from the dome switch 200 of the present invention shown in FIGS. 6 and 7 in which the white sheet 240 is omitted from the embodiment of FIGS. 4 and 5 includes the white sheet 40 and the PET sheet ( It is similar to the amount of light emitted from a conventional dome switch with 25).

In addition, by omitting the PET film, the structure accumulated on the upper surface of the dome switch 200 is reduced, the force to press the key button 255 to input a signal can be reduced by 5% to 15% compared to the conventional. Therefore, the signal can be input by pressing the key button 255 even with a small force has the advantage that the operating force of the key button 255 is increased.

As described above, according to at least one of the embodiments of the present invention, the PET sheet may be omitted, thereby reducing the thickness of the dome switch and reducing the number of members, thereby reducing the material cost.

In addition, by omitting the PET sheet, it is possible to press the key button with a force about 5% to 15% smaller than the conventional key button, thereby increasing the operating force of the key button, and the light emitted from the light source is distorted by the PET sheet, The problem of decreasing can be solved.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof.

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.

100: mobile terminal 110: wireless communication unit
120: A / V input / output unit 130: user input unit
140: sensing unit 150: output unit
160: memory 170: interface section
180: control unit 190: power supply unit
200: dome switch 210: printed circuit board
215: switch terminal 220: metal dome
230: light guide adhesive film 235: shading tape
240: white sheet 250: keypad
255: key button

Claims (10)

In the dome switch used as a key switch of a mobile terminal,
A printed circuit board having a switch terminal on an upper surface thereof;
A metal dome positioned above the switch terminal and transmitting a signal to the switch terminal when pressed by a user; And
A dome switch including an optical guide adhesive film adhered to an upper surface of the metal dome to fix the metal dome to the printed circuit board and to scatter light supplied from one side. The method of claim 1,
The optical guide adhesive film,
And a scattering pattern formed at a position corresponding to the metal dome. The method of claim 1,
And a light shielding tape formed around the optical guide adhesive film. The method of claim 1,
And a white sheet interposed between the printed circuit board and the optical guide adhesive film and having an opening formed at a position corresponding to the metal dome. 5. The method of claim 4,
The printed circuit board and the white sheet dome switch, characterized in that the adhesive is applied to the surface facing the printed circuit board. A case forming an appearance of the mobile terminal;
A keypad including a key button and located at one side of the case;
Is disposed on the lower surface of the keypad and includes a dome switch for inputting a signal when a key button is pressed,
The dome switch,
A printed circuit board having a switch terminal formed at a position corresponding to the key button, a metal dome positioned above the switch terminal and transmitting a signal to the switch terminal when pressed by a user, and bonded to an upper surface of the metal dome; Optical guide adhesive film for fixing the metal dome on the substrate and scattering the light supplied from one side
A mobile terminal comprising a. The method according to claim 6,
The optical guide adhesive film,
The mobile terminal further comprises a scattering pattern formed at a position corresponding to the metal dome. The method according to claim 6,
A mobile terminal, characterized in that it further comprises a light shielding tape formed around the optical guide adhesive film. The method according to claim 6,
And a white sheet interposed between the printed circuit board and the optical guide adhesive film and having an opening formed at a position corresponding to the metal dome. 10. The method of claim 9,
The printed circuit board and the white sheet is a mobile terminal, characterized in that the adhesive is applied to the surface facing the printed circuit board.

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