KR101561912B1 - Portable terminal and method for minimizing mic noise thereof - Google Patents

Abstract

The present invention relates to a microphone installation structure of a portable terminal, and a portable terminal related to the present invention includes a circuit board on which an antenna area is formed so that a built-in antenna can be installed; A microphone installed in the antenna area; A conductive outer layer provided on an outer surface of the microphone; A first ground connection portion formed to be connectable to the ground of the antenna region from the conductive outer layer; And a second ground connection portion formed to be connected to the ground of the component region of the circuit board excluding the antenna region from the mic.

Description

TECHNICAL FIELD [0001] The present invention relates to a portable terminal and a microphone noise reduction method therefor.

The present invention relates to a microphone installation structure of a portable terminal.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video call function, information input / output function, and data storing function.

As the functions are diversified, the mobile terminal has complicated functions such as photographing and photographing of movies, playing music or moving picture files, receiving games, broadcasting, etc. These devices are integrally mounted and are equipped with a multimedia player .

Various new attempts have been made in terms of hardware or software to implement complex functions in such multimedia devices. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

An external antenna that is exposed to the outside has been developed first, but the built-in antenna is continuously increasing in consideration of the external appearance. In this case, the built-in antenna needs to minimize the impact on other components while still achieving certain radio performance. Nevertheless, the antennas share the mounting area with other parts for miniaturization and slimming of the portable terminal. As an example, a microphone may be installed with a built-in antenna since it uses an audible frequency band that is significantly lower than the mobile communication band.

However, in the case of TDMA communication in a time division manner, a microphone installed in the vicinity of an antenna is likely to generate noise due to the periodicity of the time division.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to improve a noise characteristic of a microphone when an antenna and a microphone are installed together.

According to an aspect of the present invention, there is provided a portable terminal comprising: a circuit board on which an antenna area is formed so that a built-in antenna can be installed; A microphone installed in the antenna area; A conductive outer layer provided on an outer surface of the microphone; A first ground connection portion formed to be connectable to the ground of the antenna region from the conductive outer layer; And a second ground connection portion formed to be connected to the ground of the component region of the circuit board excluding the antenna region from the mic.

In one embodiment of the present invention, the first ground connection part and the second ground connection part may be formed to be separated from each other.

As an example related to the present invention, the conductive outer layer may be formed in the form of a conductive metal plate and attached to the surface of the microphone.

In one embodiment of the present invention, the first ground connection portion may include a conductive tape or a conductive sheet.

In one embodiment of the present invention, the first ground connection portion may include an extension extending from the conductive outer layer to the mounting surface of the microphone, and a pad portion formed to be soldable when the microphone is mounted.

In one embodiment of the present invention, the second ground connection portion may be connected to at least one of a plurality of ground lines of the microphone when the microphone is mounted.

The present invention also provides a method of manufacturing a microphone, comprising: forming a conductive outer layer on a surface of a microphone to be mounted on an antenna area of a circuit board; Electrically connecting the conductive outer layer to a ground of the internal antenna by a first ground connection; And connecting at least one of the ground lines of the microphone to a component region of the circuit board while being separated from the first ground connection portion by a second ground connection portion. do.

According to the portable terminal of the present invention, the conductive outer layer formed on the surface of the microphone is connected to the ground of the antenna by the first ground connection portion, and the ground of the microphone is connected to the ground of the circuit board by the second ground connection portion It is possible to minimize the influence of the ground of the microphone due to the ground of the antenna during the operation of the antenna. As a result, it is effectively prevented that noise enters the microphone by the antenna. The noise reduction effect of such a microphone is high in a mobile terminal used in a time division communication system such as TDMA.

In addition, since the built-in antenna and the microphone can be mounted in the same area, a portable terminal advantageous for miniaturization can be obtained.

Hereinafter, a portable terminal and a microphone noise reduction method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front perspective view of a portable terminal according to the present invention, and FIG. 2 is a front perspective view showing the portable terminal of FIG. 1 in an open state. As shown in these drawings, the portable terminal 1 may include a first terminal body 10 and a second terminal body 20 configured to be slidable in at least one direction on the first terminal body 10 .

As shown in FIG. 1, the first terminal body 10 may be referred to as a closed configuration in which the first terminal body 10 and the second terminal body 20 are disposed in a superimposed manner. The first terminal body 10 May expose at least a portion of the second terminal body 20 to an open configuration.

The portable terminal 1 mainly operates in the standby mode in the closed state, but the standby mode is also released by the user's operation. Also, it operates in the open mode, the edit mode, and the like in the open state, but it is also switched to the standby mode by the user's operation or a predetermined time.

A case (which may be referred to as a casing, a housing, a cover, etc.) constituting an outer appearance of the first terminal body 10 is formed by the front case 11 and the rear case 12. Various electronic components are embedded in the space formed by the front case 11 and the rear case 12. [ At least one intermediate case may be additionally disposed between the front case 11 and the rear case 12. [ The front case 11 may be made of a transparent material so as to serve as a window for protecting the display unit 13. The cases may be formed by injection molding a 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 13, the receiver 14, the first operating unit 16, and the first image input unit 15 may be disposed in the first terminal body 10.

The display unit 13 includes an LCD (Liquid Crystal Display) module, an OLED (Organic Light Emitting Diodes) module, and an e-paper for visually expressing information.

The display unit 13 may further include a touch sensing unit to enable information input by a user's touch. In this case, the display unit 13 may be formed to have a size corresponding to the front surface of the first body 10, and may be configured to receive input and output through the display unit 13 in a state where the first terminal body 10 is closed Or both. For example, the display unit 13 may output a keypad shape so as to perform numeric or character input or an iconized function, and the user may input the keypad by touching the keypad.

The receiver 14 serves to output a call tone. In addition, the receiver 14 may serve as a loud speaker for outputting various kinds of system sounds or multimedia reproductions, or may further include a separate speaker.

The first image input unit 15 may be implemented in the form of a camera module for capturing images or moving pictures of a user during self-photographing (self-camera) or image communication.

Like the first terminal body 10, the second terminal body 20 may include a front case 21 and a rear case 22.

The second operating portion 23 may be disposed on the front surface of the second terminal body 20, specifically, the front case 21. [

The third operating unit 24, the microphone 100, and the external interface 26 may be disposed on at least one side of the front case 21 or the rear case 22. [

The first operating portion 16, the second operating portion 23 and the third operating portion 24 may be collectively referred to as a manipulating portion. If the user operates in a tactile manner with a tactile impression, Method can be adopted. For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

In terms of functions, the first operating unit 16 can be utilized as some hot keys for quick execution in a closed state of the first terminal body 10, and also as a direction key for moving a cursor or a pointer .

The second operation unit 23 can be configured to input numbers, letters, symbols, and the like. The third operation unit 24 may operate as a hot-key for performing a special function such as activation of the first image input unit 15. [

The microphone 100 receives the user's voice, other sounds, etc. through the microphone hole 25 formed in the front case 21. The detailed installation structure of the microphone 100 will be described in detail below.

The external interface 26 is a path for allowing the portable terminal 1 related to the present invention to exchange data with an external device. For example, the external interface 26 may include a connection terminal for connecting to an earphone or a port for short-range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port a wireless Lan port), and the like. The external interface 26 may also be a card socket that accommodates an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for information storage, and the like.

On the rear case 22 side, a battery cover 31 for covering the battery (see No. 32 in FIGS. 3 and 4) is mounted. The battery cover 31 may be formed so as to cover the antenna 32 in addition to the battery 32 at once.

3 is a rear perspective view of the portable terminal of FIG. Referring to FIG. 3, a second image input unit 27 may be additionally mounted on the rear surface of the rear case 22 of the second terminal body 20. The second image input unit 27 may have a photographing direction substantially opposite to that of the first image input unit 15 and may be a camera having different pixels from the first image input unit 15. For example, the first image input unit 15 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party. The second image input unit 27 photographs a general object It is preferable to have a high pixel because it is often not transmitted.

3, the second image input unit 27 and the like are disposed in the second terminal body 20, but the present invention is not limited thereto. For example, at least one of the configurations described as being disposed in the rear case 12, such as the second image input unit 27, may be mounted on the first terminal body 10, mainly the rear case 12 Do. In such a case, there is an advantage that the configuration (s) arranged in the rear case 12 in the closed state is protected by the second terminal body 20. [ Further, even if the second image input unit 27 is not separately provided, the first image input unit 15 may be rotatable so that the second image input unit 27 can be photographed up to the photographing direction.

A flash or mirror 29 may be additionally disposed adjacent to the second image input unit 27.

A speaker may be additionally disposed in the rear case 22 of the second terminal body 20. [ The speaker may implement a stereo function with the receiver 14, and may be used for talking in the speakerphone mode. The receiver 14 and the speaker may be collectively referred to as an acoustic output section.

A part of the slide module 30 that slidably couples the first terminal body 10 and the second terminal body 20 is disposed on the rear case 12 side of the first terminal body 10. [ The other part of the slide module 30 may be disposed on the front case 21 side of the second terminal body 20 and may not be exposed to the outside as shown in the figure.

The portable terminal according to an embodiment of the present invention is not limited to the slide type shown in Figs. 2 and 3, but can be applied to various structures such as a folder type and a swing type.

FIG. 4 is an exploded perspective view of the first terminal body of the portable terminal according to the present invention viewed from the rear. FIG. 4, the second terminal body 20 can be assembled by the front case 21 and the rear case 22. As shown in FIG. In the interior of the front case 21 and the rear case 22, a circuit board 40 equipped with various components including a wireless communication module for processing wireless transmission / reception signals and a processor for operating the system is installed. The front surface (not shown) of the circuit board 40 is mainly equipped with a dome switch operated by the second operating portion 23, and the rear surface (the surface shown in FIG. 4) is mainly equipped with various components described above. It is also possible that the circuit board 40 is formed as a plurality in accordance with the inside of the portable terminal.

The circuit board 40 related to the present invention can be broadly divided into two parts: an antenna area 42 where the built-in antenna 50 is to be mounted and a parts area 41 excluding the antenna area 42. [ The antenna 50 and the microphone 100 related to the present invention are mounted in the antenna region 42 in consideration of the radio performance and interference of the antenna 50, rather than other components.

The antenna 50 includes a conductive antenna pattern portion 51 and the antenna pattern portion 51 is supported by a dielectric carrier 55. The antenna 50 includes at least one power feeder 52,53. The feeding parts 52 and 53 are formed in a spring shape so as to be elastically contacted with the feeding pads 45 and 46 formed in the antenna area 42 of the circuit board 40.

4, on the surface of the component region 41, there is shown a line-shaped ground 43 formed for partitioning components and enhancing the shielding property. The component region 41 is covered with a conductive shield can 44.

For operation of the antenna 50, the ground may extend to the antenna area of the circuit board 40, and one of the feed parts 52 and 53 may be directly connected to the ground as shown in FIG. 4 .

FIG. 5A is an exploded perspective view showing a disassembled state before a microphone related to the present invention is mounted on a circuit board, FIG. 5B is an assembled perspective view of FIG. 5A, FIG. 6 is a plan view of a state in which a microphone is attached, 5B are side cross-sectional views of a state where a microphone and an antenna are attached to a circuit board.

As shown in these drawings, the microphone 100 is soldered and coupled to a plurality of pads 130A, 130B, 130C, 130D, and 130E formed on a circuit board 40. [ A through hole 40a is formed in the circuit board 40 so that sound can be transmitted to the microphone 100. Here, the microphone 100 is a type in which a sound receiving portion is directed toward the circuit board 40, but the microphone 100 may be disposed such that the sound receiving portion is exposed in a direction opposite to the circuit board 40, Can also be applied.

On the outer surface of the microphone 100, a conductive outer layer 110 is formed. The conductive outer layer 110 may be formed in the form of a conductive metal plate or metal coating, and may be attached to the surface of the microphone 100. The portion covered by the conductive outer layer 110 may be disposed only on the upper surface of the microphone 100 as shown in FIG. 5A, or may be the entire side surface including the upper surface.

The conductive outer layer 110 is connected to the ground of the antenna region 42 by the first ground connection Gr1. Here, the 'ground of the antenna region 42' is used to distinguish it from the 'ground existing in the component region 41'. As described later, the first ground connection Gr1 is connected to the ground of the antenna region 42, While the second ground connection Gr2 is connected to the ground of the component region 41. [ However, the ground of the antenna region 42 and the ground of the component region 41 are electrically connected.

5A, the first ground connection Gr1 includes a conductive tape or film 121 extending from the conductive outer layer 110 and a ground pad 122 forming part of the ground existing in the antenna area have. The conductive tape or film 121 may be formed in one or more numbers between the conductive outer layer 110 and the ground pad 122 of the circuit board 40.

By forming the conductive outer layer 110, the conductive outer layer 110 serves to primarily block the electromagnetic wave of the antenna 50 flowing into the microphone 100. Therefore, noise from the antenna 50 is prevented from flowing into the microphone 100 when the antenna 50 operates.

5A, the pads 130A, 130B, 130C, 130D, and 130E formed on the circuit board 40 for connecting the microphone 100 include signal lines 130A for transmitting signals, 130B, 130C, 130D, and 130E. The ground lines 130D and 130E of the plurality of ground lines 130B, 130C, 130D and 130E form a second ground connection Gr2. 7, the second ground connection part Gr2 is formed separately from the first ground connection part Gr1, and the ground line of the microphone 100 itself is connected to the component area (not the ground) of the antenna area 42 41 to the ground.

In this way, a part of the ground lines inside the microphone are connected to the ground of the component area 41 while being separated by the second ground connection part Gr2, and the conductive outer layer 110 attached to the outside of the microphone is connected to the first ground connection part Is connected to the ground of the antenna area 42 by the grating Gr1 to minimize the influence of the microphone 100 by the antenna 50. [ Particularly, when the antenna 50 operates in a time-sharing communication system such as TDMA, the periodic change of the electromagnetic wave in the antenna 50 in the audible frequency range flows into the microphone 100, TDMA noise " is effectively blocked.

8A and 8B are graphs showing the effect of eliminating the TDMA noise as described above. FIG. 8A is a graph showing the degree of noise-induced noise according to frequency when the ground lines of the microphones are all connected to the ground of the antenna region, And a portion of the ground line of the microphone is connected to the ground of the component region by the second ground connection portion. According to FIG. 8A, it can be seen that the noise is concentrated intensively in the vicinity of about 210 kHz. On the other hand, as shown in FIG. 8B, in a state where the first ground connection Gr1 and the second ground connection Gr2 are connected, the noise is measured at about -85 dBm or less in the entire frequency range.

9 is a perspective view of a microphone installation structure showing a modification of the first ground connection portion according to the present invention. 9, the conductive tape or the lower end of the film 121 is folded toward the bottom surface of the microphone 100. As shown in Fig. With this structure, the area occupied by the conductive tape or film 121 on the circuit board 40 can be reduced and the mounting density can be increased.

10 is a perspective view of a microphone installation structure showing still another modification of the first ground connection portion related to the present invention. 10, the first ground connection Gr1 includes an extension 125 extending from the conductive outer layer 110 to the mounting surface of the microphone 100, and a pad (not shown) formed to be solderable when the microphone 100 is mounted. (126). With this structure, the conductive outer layer 110 can be shielded simultaneously with the mounting of the microphone 100, so that the number of processes and costs can be reduced.

11 is a block diagram of a portable terminal according to the present invention.

An exemplary embodiment of the present invention includes a wireless communication module 81, operation units 16, 23 and 24, image input units 15 and 27, a microphone 100, a display unit 13, a sound output unit 14, A sensing unit 86, an external interface 26, a broadcast receiving module 85, a memory 84, a power supply unit 32 and a control unit 80.

The control unit 80 typically controls the overall operation of the portable terminal. For example, voice communication, data communication, video communication, and the like.

The wireless communication module 81 transmits / receives a wireless signal to / from the mobile communication base station through the antenna 50. A transmitter 83 for transmitting and receiving voice data, character data, image data, and control data under the control of the controller 80, for modulating and transmitting a signal to be transmitted for this purpose, a receiver 83 for demodulating the received signal, (82).

The operation units 16, 23, and 24 are configured as shown in FIGS. 1 to 3, and provide the control unit 80 with key input data that the user inputs for controlling the operation of the terminal.

The image input units 15 and 27 process image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. Then, the processed image frame is converted into image data that can be displayed on the display unit 13 and output to the display unit 13. [

The image frames processed by the image input units 15 and 27 are stored in the memory 84 under the control of the control unit 80 or transmitted to the outside through the wireless communication module 81.

The microphone 100 receives an external sound signal 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 is converted into a form that can be transmitted to the mobile communication base station through the wireless communication module 81 in the communication mode, and is output to the wireless communication module. In the record mode, the processed voice data is output to be stored in the memory 84. [ In addition, the microphone 100 may be implemented with various noise reduction algorithms for eliminating noise generated in receiving an external sound signal.

The display unit 13 displays and outputs information processed in the portable terminal. For example, when the portable terminal is in the call mode, the control unit 80 displays a UI (User Interface) or a GUI (Graphic User Interface) associated with the call. When the portable terminal is in the video communication mode or the photographing mode, the control unit 80 displays and displays the photographed image, the UI, and the GUI. When the display unit 13 includes a touch screen, the display unit 13 is used as an input device in addition to the output device.

The sound output unit 14 outputs sound data received from the wireless communication module 81 under the control of the control unit 80 in the call signal receiving mode, the communication mode or the recording mode, the voice recognition mode, Converts the stored sound data and outputs it to the outside.

The sound output unit 14 outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the portable terminal. The sound output unit 14 includes a speaker, a receiver, a buzzer, and the like.

The sensing unit 86 senses the current state of the portable terminal, such as the opening / closing state of the portable terminal, the position of the portable terminal, whether or not the user touches the portable terminal, and generates a sensing signal for controlling the operation of the portable terminal. For example, if the portable terminal is in the form of a slide phone, it senses whether the slide phone is opened or closed, and outputs the sensing result to the controller 80 so that the operation of the terminal is controlled. And a sensing function related to whether or not the power supply unit 32 is powered on, whether the external interface 26 is connected to an external device, and the like.

The external interface 26 may include a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (for example, a memory card, a SIM / UIM card) It serves as an interface with external devices. The external interface 26 receives data from an external device or receives power from the external device, transfers the data to each component in the portable terminal, or transmits data in the portable terminal to an external device.

The memory 84 may store a program for processing and controlling the control unit 80 and may have a function for temporarily storing input / output data (e.g., a phone book, a message, a still image, .

Such memory 84 includes the concept of a generally known hard disk, a card type memory (e.g., SD or XD memory), flash memory, RAM, ROM, and the like.

The broadcast receiving module 85 receives broadcast signals transmitted through satellite or terrestrial waves, converts the received broadcast signals into broadcast data formats that can be output to the sound output unit 14 and the display unit 13, and outputs the broadcast data formats to the control unit 80. In addition, the broadcast receiving module 85 receives additional data (e.g., EPG (Electric Program Guide), channel list, etc.) related to broadcasting. The broadcast data and the additional data converted by the broadcast receiving module 85 may be stored in the memory 84. [

The power supply unit 32 receives external power and internal power under the control of the controller 80 and supplies power required for operation of the respective components.

The above-described portable terminal and its microphone noise reduction method are not limited to the configuration and method of the above-described embodiments, but the embodiments may be modified so that all or some of the embodiments may be modified Or may be selectively combined.

1 is a front perspective view of a portable terminal according to the present invention;

FIG. 2 is a front perspective view showing a state in which the portable terminal of FIG.

FIG. 3 is a rear perspective view of the portable terminal of FIG.

FIG. 4 is an exploded perspective view of the first terminal body of the portable terminal according to the present invention,

5A is an exploded perspective view showing a disassembled state before a microphone related to the present invention is mounted on a circuit board.

FIG. 5B is a perspective view of FIG.

6 is a plan view showing a state where a microphone is attached

7 is a side sectional view of the microphone and the antenna attached to the circuit board,

8A and 8B are graphs showing the effect of eliminating the TDMA noise as described above. FIG. 8A is a graph showing the degree of noise-induced noise according to frequency when the ground lines of the microphones are all connected to the ground of the antenna region, The outer layer is connected to the ground of the antenna area by the first ground connection and a part of the ground line of the microphone is connected to the ground of the component area by the second ground connection.

9 is a perspective view of a microphone installation structure showing a modification of the first ground connection portion according to the present invention.

10 is a perspective view of a microphone installation structure showing another modification of the first ground connection portion according to the present invention.

11 is a block diagram of a portable terminal according to the present invention.

Claims (11)

A circuit board including an antenna region in which a built-in antenna is installed and a component region in which the component is mounted; A microphone installed in the antenna area; A plurality of pads that are located in the area of the antenna area where the microphones are installed and couple the microphones to the antenna area; A conductive outer layer provided on an outer surface of the microphone; A first ground connection portion formed from the conductive outer layer to be connected to a ground of the antenna region along a surface of the circuit board; And And a second ground connection portion formed to be connectable from a pad of the plurality of pads to a ground of the component region through the inside of the circuit board. delete The method according to claim 1, Wherein the conductive outer layer is in the form of a conductive metal plate and is attached to the surface of the microphone. The method of claim 3, Wherein the first ground connection portion includes a conductive tape or a conductive sheet. The plasma display apparatus of claim 3, wherein the first ground connection portion includes: An extended portion extending from the conductive outer layer to the mounting surface of the microphone, and a pad portion formed to be solderable when the microphone is mounted. The method according to claim 1, Wherein the part of the pad corresponds to at least part of a plurality of ground lines included in the inside of the microphone. Forming a conductive outer layer on an outer surface of a microphone to be installed in the antenna region, of a circuit board including an antenna region in which a built-in antenna is installed and a component region in which the component is mounted; Coupling the microphone to the antenna using a plurality of pads located in an area of the antenna area where the microphone is installed; Electrically connecting the conductive outer layer to the ground of the internal antenna by a first ground connection formed from the conductive outer layer to the ground of the internal antenna along the surface of the circuit board; And And electrically connecting the ground of the component region to the microphone by a second ground connection portion formed to be connected from the pad of the plurality of pads included in the inside of the microphone to the ground of the component region through the inside of the circuit board Wherein the microphone noise reduction method comprises the steps of: 8. The method of claim 7, Wherein the first ground connection portion is formed of a conductive tape or a conductive sheet. 8. The method of claim 7, Wherein the first ground connection portion includes an extension extending from the conductive outer layer to the mounting surface of the microphone and a pad portion formed to be solderable when the microphone is mounted. 8. The method of claim 7, Wherein the plurality of pads correspond to at least a part of a plurality of ground lines included in the microphone. 8. The method of claim 7, Wherein the portable terminal is configured to operate in a time divisional communication system.

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