JP2008035084A - Portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a portable terminal, in which a metallic mesh is arranged on the front face of a microphone in order to reduce noise, to reduce the noise and improve water resistance simultaneously. <P>SOLUTION: A water-repellent mesh 34 or water-repellent non-woven cloth is attached on a metallic mesh 33 attached to the front face of a microphone 50 for reducing a noise for the purpose of the improvement of the water resistance of a noise preventing structure so that it is possible to improve water resistance without deteriorating the shield effects of a noise to be generated in portable telephone equipment 1 itself. Also, the water-repellent mesh 34 or the water-repellent nonwoven cloth is structured in a smaller size that the inner diameter of the opening (the sound hole side of a microphone 30) of a rubber holder 32 holding the microphone 30 so as to be arranged in the opening of the rubber holder 32 so that it is possible to mount the microphone without affecting the thickness of the portable telephone set 1, and to suppress the member costs of the water-repellent mesh 34 or the water-repellent nonwoven cloth. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile terminal, and more particularly, to a mobile terminal including a noise prevention structure that reduces the influence of electrical noise on a microphone.

  Since various parts are mounted in a portable terminal such as a cellular phone with high density, and other parts may be affected by electrical noise generated by a specific part, various parts for reducing noise are used. Ingenuity has been made. For example, the following Patent Document 1 discloses a noise prevention method for reducing high-frequency noise generated from a circuit board or the like mounted on a portable information terminal. By forming a conductive material by metal foil or metal plating on the surface, high frequency noise generated by a circuit board or the like is reduced.

JP 2003-264355 A (paragraph 0037-0042, FIG. 2-3)

  Noise can be reduced to some extent with respect to components such as circuit boards and housings where conductors can be placed, but it is difficult to place conductors in parts of mobile terminals due to their structure and mounting. There are also goods. For example, since a microphone requires an opening for inputting sound (microphone sound hole) due to its structure, it cannot be covered with a conductive material, and because of the configuration of a portable terminal, the microphone is not a transmission / reception circuit or a key. Are placed close to the components that illuminate from the back surface, etc., the noise level of the audio signal from the microphone may increase due to the influence of electrical noise generated by these components.

  Therefore, in order to suppress electrical noise to the microphone, a noise prevention method in which a metal mesh is arranged on the front surface of the microphone has been proposed. However, the metal mesh is weak in water resistance and is generally used for portable terminals. In the case of a condenser microphone, when liquid enters from the microphone sound hole into the microphone, there is a problem that the charge stored in the microphone capsule or electrode disappears and sensitivity deterioration occurs.

  In addition, Teflon (registered trademark) processing is known as a technique for imparting water repellency to metal mesh, but in Teflon (registered trademark) processing, wind pressure and water pressure when closing the case with a folding mobile phone, etc. When is added, sufficient water resistance cannot be obtained. On the other hand, when a complicated waterproof structure is provided in the microphone in order to obtain sufficient water resistance, there arises a problem that the thickness of the mobile terminal increases.

  Therefore, it is necessary to propose a structure that realizes the improvement in water resistance, which is a weak point of the above-described noise prevention structure, by a method that does not hinder the thinning of the mobile terminal.

  The present invention has been made in view of the above problems, and its main object is to reduce noise and water resistance in a portable terminal having a structure for reducing noise by arranging a metal mesh on the front surface of a microphone. An object of the present invention is to provide a portable terminal that can realize improvement at the same time.

  In order to achieve the above object, the present invention is a portable terminal equipped with a microphone, wherein a metal mesh and a water-repellent mesh or a water-repellent nonwoven fabric are arranged in this order on the voice input side of the microphone. Is.

  The present invention is also a portable terminal equipped with a microphone, wherein a metal mesh is affixed to the voice input side surface of the microphone, and a water repellent mesh or a water repellent nonwoven fabric is formed on the metal mesh. It is what has been pasted.

  The present invention is also a portable terminal equipped with a microphone, wherein the microphone is fixed to a housing having a sound hole for inputting sound on a surface of the sound input side, and the microphone is mounted on the housing side of the microphone. A metal mesh having a larger diameter than the sound hole is attached to a region facing the sound hole, and the region having the diameter larger than the sound hole is included in the region including the sound hole on the microphone side of the housing. A water-repellent mesh or a water-repellent non-woven fabric is attached, and a recess having a diameter larger than the sound hole is formed in a region including the sound hole on the microphone side of the casing, and the water-repellent mesh Or it can be set as the structure by which the said water-repellent nonwoven fabric is being fixed in the said recessed part.

  The present invention is also a portable terminal equipped with a microphone, the microphone including a single microphone, a metal mesh disposed on a voice input side surface of the single microphone, the single microphone and the metal mesh. And a water-repellent mesh or a water-repellent non-woven fabric that is installed in the opening of the rubber holder and fixed to the metal mesh. .

  In the present invention, the metal mesh may be connected to the ground of the mobile terminal.

  Further, the present invention is a portable terminal equipped with a microphone, wherein the microphone is disposed on a circuit board near a noise generating component, and the microphone includes a single microphone covered with a metal capsule, and a single microphone. A metal mesh disposed on the surface of the voice input side, a rubber holder that covers the microphone and the metal mesh, and has an opening formed on the voice input side, and is installed in the opening of the rubber holder, A water repellent mesh or a water repellent nonwoven fabric fixed to a metal mesh, wherein the metal mesh is connected to the ground of the circuit board through the capsule, and the noise generating component is In addition, an EL sheet that illuminates the operation unit from the back surface can be obtained.

  In the present invention, the water-repellent mesh is configured with a count different from that of the metal mesh, and the mesh is made finer by superimposing the water-repellent mesh and the metal mesh. Can do.

  As described above, in the present invention, a water repellent mesh or a water repellent nonwoven fabric is further attached to the front surface of the metal mesh affixed to the front surface of the microphone for noise reduction. Since it has a structure that is smaller than the inner diameter of the opening (microphone sound hole side) of the rubber holder holding the microphone and is arranged inside the opening of the rubber holder, the portable terminal is not hindered from thinning the portable terminal. It is possible to simultaneously improve the shielding performance of the noise generated by itself and the water resistance. Moreover, since the water-repellent mesh and the water-repellent nonwoven fabric may be small in size, an increase in member costs can be suppressed as much as possible.

  The portable terminal of the present invention has the following effects.

  The first effect of the present invention is that the water resistance can be improved without reducing the shielding effect of noise generated by the mobile terminal itself. The reason for this is that the water resistance of the metal mesh, which is a weak point of the noise prevention structure used to prevent electrical noise in mobile terminals, is applied to the water-repellent mesh and water-repellent nonwoven fabric on the metal mesh affixed to the front of the microphone. This is because it is realized by pasting.

  Specifically, the water-repellent mesh or water-repellent nonwoven fabric is attached to the opening of the rubber holder (microphone sound hole side) where the microphone is held. This is because the meshes become finer and the risk that the liquid that has entered from the microphone sound hole of the housing with the wind pressure enters the inside of the microphone can be reduced by overlapping the arrangement. In particular, it is possible to prevent the liquid adhering to the microphone sound hole portion of the housing from entering the sound hole of the microphone due to the wind pressure when folding the case of the folding cellular phone. This is because the occurrence of poor sensitivity can be prevented.

  Further, the second effect of the present invention is that water resistance can be improved without affecting the thickness of the mobile terminal. The reason is that the water-repellent mesh and the water-repellent nonwoven fabric have a size smaller than the inner diameter of the opening of the rubber holder (microphone sound hole side) where the microphone is held, and are arranged in the opening of the rubber holder. This is because the water-repellent mesh or water-repellent nonwoven fabric to be attached does not affect the height of microphone mounting.

  The third effect of the present invention is that an increase in member cost can be suppressed as much as possible. The reason is that, as described above, the water-repellent mesh or the water-repellent nonwoven fabric has a size smaller than the inner diameter of the opening of the rubber holder, so that the member cost of the water-repellent mesh or the water-repellent nonwoven fabric can be reduced.

  As shown in the related art, in a mobile terminal such as a mobile phone, other components may be affected by electrical noise generated by a specific component. As a method of reducing the noise, there are a method of arranging a conductive material between circuit boards and a method of forming a conductive material by metal foil or metal plating on the surface of the casing. The noise level of the audio signal from the microphone increases due to the influence of electrical noise generated by various electrical components (for example, components that illuminate the transmitter / receiver circuit and the key from the back) mounted on the mobile terminal. There is a problem of end up.

  In order to reduce the influence of noise on the microphone mounted on the portable terminal when the portable terminal itself generates noise in the prior application (Japanese Patent Application No. 2006-012295), A structure in which a metal mesh is arranged in front of a microphone is proposed. However, metal mesh is less water-resistant than water-repellent nonwoven fabrics conventionally used for microphones, and condenser microphones generally used for portable terminals have liquids that are introduced from the microphone sound holes into the microphone due to user handling. When it penetrates, the electric charge stored in the microphone capsule or the electrode disappears, and there is a high possibility that the sensitivity is deteriorated.

  Therefore, in the present invention, for the purpose of improving water resistance, which is a weak point of the noise prevention structure of the prior application, a water repellent mesh or a water repellent nonwoven fabric is further provided on the metal mesh attached to the front surface of the microphone for noise reduction. The water resistance is improved without reducing the shielding effect of noise generated by the mobile terminal itself. In addition, since the water-repellent mesh or the water-repellent nonwoven fabric has a size smaller than the inner diameter of the opening (the sound hole side of the microphone) of the rubber holder that holds the microphone, and is arranged in the opening of the rubber holder, It can be mounted without affecting the thickness of the material, and the member cost for the water-repellent mesh and the water-repellent nonwoven fabric is minimized.

  In order to describe the above-described embodiment of the present invention in more detail, a mobile terminal according to a first example of the present invention will be described with reference to FIGS.

  FIG. 1 is a front external view and a side external view of a mobile phone having a folding structure of the present embodiment. As shown in FIG. 1, the cellular phone 1 having the folding structure of the present embodiment includes a first housing (hereinafter referred to as an upper housing 2) having a display unit 20, a receiving speaker 21, and the like, and an operation unit 23. And a microphone 30 and the like, and a second casing (hereinafter referred to as the lower casing 3) that is rotatably connected by a hinge 4 provided at the lower end of the upper casing 2 and is hinged. The upper casing 2 is opened and closed with respect to the lower casing 3 by rotating at 4.

  The upper housing 2 includes a display unit 20 such as an LCD (Liquid Crystal Display) or an organic EL display (organic electroluminescence display), a receiving speaker 21, a circuit board, a front case, a rear case, and the like.

  The lower housing 3 includes a battery, an operation unit 23, a driving circuit such as a display unit 20 and a speaker, a circuit board having an integrated circuit and a radio circuit, a microphone 30 as an audio input unit, an earphone jack, image data and melody data. It consists of a slot for inserting a memory card for recording, a case on the input key side, a case on the back side, and the like.

  FIG. 2 is a block diagram illustrating an example of the configuration of the mobile phone 1. As shown in FIG. 2, the mobile phone 1 includes an antenna 5 that transmits and receives radio waves, a control unit 10, a storage unit 11, a wireless communication unit 12, an operation unit 23, a display unit 20, a camera unit ( (Hereinafter referred to as a camera) 24, a receiving speaker 21 for ringing a received voice, a speaker 22 for outputting a ringtone or a melody, a microphone 30 for voice input, and keys that are constituent elements of the operation unit 23 described later. An EL sheet 14 is provided on the back surface of the sheet for illuminating the key sheet, and an EL drive circuit 13 that controls the drive of the EL sheet 14.

  The control unit 10 includes, for example, a CPU (Central Processing Unit) and various peripheral circuits (not shown), and has a function of controlling each unit included in the mobile phone 1.

  The storage unit 11 is configured by a storage medium such as a RAM (Random Access Memory), and stores various data such as a control program executed by the control unit 10.

  The wireless communication unit 12 has a function of modulating / demodulating signals according to a predetermined communication protocol. Specifically, the radio communication unit 12 performs a process of demodulating a radio signal received via the antenna 5. Further, the wireless communication unit 12 performs a process of modulating a signal output from the control unit 10 and transmitting a wireless signal via the antenna 5.

  The operation unit 23 includes, for example, a key button for inputting a telephone number and has a function of outputting an input signal corresponding to a user operation to the control unit 10. The operation unit 23 may be configured to press a key button, or a touch panel having both a display function and an operation function may be used.

  The display unit 20 is configured by, for example, an LCD or an organic EL display, and is disposed inside the upper housing 2 (or both the inner and outer surfaces of the upper housing 2) when the cellular phone 1 is folded. For example, a standby screen or a function setting screen is displayed.

  The camera 24 has various functions provided in a digital camera, for example, and includes an imaging element such as a CCD (Charge Coupled Devices) that images a subject, a circuit that outputs image data obtained by imaging to the control unit 10, and the like. Yes.

  A ring tone or ringing melody is generated from the speaker 22, and a voice signal during a call is output from the receiving speaker 21.

  The EL sheet 14 has a function of emitting light when the drive power output from the EL drive circuit 13 is supplied under the control of the control unit 10.

  1 and FIG. 2 is merely an example, and the mobile phone 1 according to the present embodiment only needs to include the microphone 30. The mobile phone 1 may have a form (folding type, slide type, integrated type, etc.) Arrangement of components is arbitrary, and other functions such as an RFID (Radio Frequency Identification) function and a TV broadcast receiving function may be provided as a function of the mobile phone 1. Moreover, although the structure which illuminates the operation part 23 with the EL sheet 14 is demonstrated below, even when there is no EL sheet 14, the same effect can be acquired.

  Next, the configuration of the lower housing 3 will be described. FIG. 3 is an explanatory view showing a state in which the lower housing 3 is disassembled. As shown in FIG. 3, a key sheet 40 on which the key button portions of the mobile phone 1 are formed is disposed on the back side of the key case 41 on the input key side of the lower housing 3. Further, the EL sheet 14 is disposed on the back side of the key sheet 40 (the side opposite to the key side case 41). In the present embodiment, the power generated by the EL drive circuit 13 under the control of the control unit 10 is supplied to the EL sheet 14, and the EL sheet 14 emits light, whereby the key sheet 40 emits light to the user of the mobile phone 1. Can look like.

  A circuit board 28 on which various control circuits are mounted is disposed on the back side of the EL sheet 14 (the side opposite to the key sheet 40). The circuit board 28 is connected to an I / O connector 29 for connecting the mobile phone 1 to an external device (for example, an information terminal such as a personal computer or a charger). A microphone 30 is arranged. The microphone (condenser microphone) 30 is used to acquire (input) an audio signal during a voice call, and converts the audio signal into an electric signal. In this embodiment, the microphone 30 is a condenser microphone, but may be a microphone using another driving method. The I / O connector 29 is a connector for exchanging signals with an external device, but is provided with a rib for fixing the microphone 30, and the microphone 30 is fixed by the rib.

  The circuit board 28 is mounted with LSI (Large Scale Integration) or the like to form a predetermined circuit. In this embodiment, the circuit board 28 is mounted with an LSI for controlling the cellular phone 1 and supplying power to the EL sheet 14. Moreover, as shown in FIG. 3, in the lower housing 3, the EL sheet 14 and the microphone 30 are mounted in the vicinity. The microphone 30 is disposed so as to be positioned on the back side of the sound hole of the key side case 41, and is held in both the upper and lower sides by the key side case 41 and the back side case 42 and stored in the lower casing 3.

  The configuration of FIG. 3 is also an example, and the structure and arrangement of each component can be changed as appropriate. In this embodiment, the case where the microphone 30 is fixed to the I / O connector 29 will be described. However, the same effect can be obtained even when the microphone 30 is fixed to another component, for example, the circuit board 28.

  Next, the configuration of the microphone 30 will be described. FIG. 4A is a front external view of the microphone 30 of the present embodiment, and FIG. 4B is a cross-sectional view of the center line BB of the microphone 30. As shown in FIG. 4, the microphone 30 according to the present embodiment includes a microphone 31, a rubber holder 32, a metal mesh 33, and a water repellent mesh 34.

  The metal mesh 33 is made of a fine wire such as stainless steel in a mesh shape, and has a size substantially the same as that of the microphone 31 and is attached to the sound hole side of the microphone 31. The rubber holder 32 has an opening in the direction toward the sound hole side of the microphone 30 and holds the microphone 31 to which the metal mesh 33 is attached so as to wrap. The water-repellent mesh 34 is preferably made of, for example, a fiber such as nylon, and has a thickness and a count that are less likely to be acoustically resistant (less deterioration in microphone sensitivity characteristics). The water-repellent mesh 34 is slightly smaller in diameter than the opening of the rubber holder 32 and is affixed to the metal mesh 33 within the range of the opening of the rubber holder 32. Thereby, the water repellent mesh 34 is affixed so that the sound hole range of the microphone sound hole 31d of the microphone 31 mentioned later may be covered.

  Thus, by arranging the water-repellent mesh 34 so as to overlap the metal mesh 33, the mesh can be made finer, and the liquid that has entered from the microphone sound hole of the key-side case 41 with wind pressure is a single microphone. The risk of entering the microphone 30 from the 31 sound holes can be reduced. It is possible to make the mesh finer by changing the count of the water repellent mesh 34 to the count of the metal mesh 33. The water-repellent mesh 34 may be a water-repellent nonwoven fabric obtained by performing a water-repellent treatment on a nonwoven fabric made of fibers such as nylon and acrylic.

  Further, the thickness of the water repellent mesh 34 is about 0.1 mm, and it is easy to make it thinner than the rubber thickness of the front surface of the rubber holder 32 indicated by C in the figure. Therefore, when the microphone 30 is mounted on the housing. There is no need to increase the mounting height of the microphone portion, and there is an advantage that excessive stress is not applied to the front surface of the microphone 30.

  Next, the operation of the microphone 31 that is a component of the microphone 30 and the structure of the microphone 30 will be described. FIG. 5 is a cross-sectional view showing an example of the structure of the microphone 30, and is a schematic diagram showing the internal structure of the microphone unit 31. As shown in FIG. 5, the microphone 31 includes a microphone body including an FET 31a and a diaphragm 31b mounted on a printed board 31e in a capsule 31c made of metal (for example, an alloy containing copper). It is configured. In addition, a plurality of microphone sound holes 31d for inputting sound are provided on the front surface of the capsule 31c. The capsule 31c is connected to the ground of the circuit board 28 by wiring or the like or by contacting the circuit board 28 through an opening (not shown) provided in advance on the bottom surface side of the rubber holder 32. The microphone 30 of the present embodiment is a condenser microphone, which converts the capacitance change of the capacitor formed between the diaphragm 31b and the capsule 31c as an electric signal and outputs the electric signal. The capsule 31c facing the diaphragm 31b. The polymer film affixed to the inside is charged.

  A metal mesh 33 is attached to the front surface of the capsule 31c, and the metal mesh 33 is placed in contact with the metal capsule 31c to be electrically connected to the capsule 31c. The metal mesh 33 is grounded to the ground of the circuit board 28 via the capsule 31c, and when electrical noise is input from the sound hole of the key-side case 41, the microphone 30 from the microphone sound hole 31d of the capsule 31c. Electrical noise that enters inside is shielded by the metal mesh 33.

  Specifically, in this embodiment, electrical noise radiated from the EL sheet 14 disposed in the vicinity of the microphone 30 (for example, the same housing) can be input from the microphone sound hole 31d of the capsule 31c. By being shielded by the metal mesh 33, the level of electrical noise that enters the microphone 30 can be reduced. Further, in this embodiment, the microphone 30 is disposed on the I / O connector 29 shielded by being connected to the ground, whereby the back surface of the microphone 30 (surface opposite to the side on which sound is input). Electrical noise from the side can also be reduced.

  Next, a specific mounting structure of the microphone 30 will be described. FIG. 6 is a cross-sectional view showing an example of a microphone 30 mounting structure. As shown in FIG. 6, the key-side case 41 is provided with a microphone fixing rib 41b for fixing the microphone 30 in an annular shape around the microphone sound hole 41a. The microphone 30 includes a microphone unit 31, a metal mesh 33, a rubber holder 32, and a water repellent mesh 34, and is fitted and fixed to the microphone fixing rib 41 b.

  Next, the operation of causing the EL sheet 14 of the mobile phone 1 to emit light and the reduction of electrical noise that occurs when the EL sheet 14 emits light will be described.

  When a predetermined light emission condition for causing the key sheet 40 to emit light such as a user pressing various keys of the operation unit 23 or an incoming call to the mobile phone 1 is established in the mobile phone 1, the EL of the circuit board 28. Power is supplied from the drive circuit 13 to the EL sheet 14. Then, when power is supplied to the EL sheet 14 and the EL sheet 14 emits light, when the user looks at the operation unit 23 of the mobile phone 1, the key sheet 40 of the mobile phone 1 appears to emit light.

  At that time, when the EL sheet 14 emits light, an electrical driving noise is generated because an AC driving voltage of about 300 Hz is applied between the anode and cathode plates of the EL sheet 14, and this noise is radiated to the periphery. The microphone 30 can enter the microphone 30 through the microphone sound hole 31d of the microphone 30 mounted in the vicinity of the EL sheet 14. Then, due to the input of electrical noise, the signal level of the gate of the FET 31a connected to the diaphragm 31b of the microphone 30 varies, and noise is generated in the output signal of the microphone 30.

  However, in the mobile phone 1 of the present embodiment, the metal mesh 33 is attached to the front surface of the microphone 30, and the metal mesh 33 grounded to the ground of the circuit board 28 is generated from the EL sheet 14, and the microphone Since the electric noise that tries to enter the microphone 30 from the sound hole 31d is shielded, the input of the electric noise to the microphone 30 can be reduced.

  As described above, according to the present embodiment, the water repellent mesh 34 or the water repellent nonwoven fabric is formed on the inner diameter of the opening of the rubber holder 32 on the metal mesh 33 for shielding electrical noise from entering the microphone. By sticking within the range, the liquid can be prevented from entering the inside of the microphone 30 and the risk of the deterioration of the sensitivity of the microphone 30 due to the disappearance of the charge stored in the capsule 31c and the electrode of the microphone 30 can be greatly reduced. In addition, since the height of the microphone mounting is not affected, it is possible to reduce the material cost of the water repellent mesh 34 and the water repellent nonwoven fabric without hindering the thinning of the mobile phone 1. . Further, by changing the count of the water repellent mesh 34 to the count of the metal mesh 33, it is possible to make the mesh finer and further improve the waterproofness.

  Next, a portable terminal according to a second embodiment of the present invention will be described with reference to FIG.

  FIG. 7 is a cross-sectional view showing an example of a specific microphone mounting structure of the mobile phone according to the second embodiment of the present invention, in which the microphone is mounted on the key case 44 of the lower housing 3. Is shown.

  A microphone fixing rib 44b for fixing the microphone 50 in an annular shape around the microphone sound hole 44a is provided inside the key side case 44 of the lower housing 3 and the inner diameter of the rubber holder 52 around the microphone sound hole 44a. A mesh attaching surface 44c is provided in a range of dimensions of D or less, and the water-repellent mesh 54 is attached to the mesh attaching surface 44c with an adhesive material such as a double-sided tape. The microphone 50 is assembled to the rubber holder 52 in a state where the metal mesh 53 is attached to the front surface (sound hole surface) of the microphone unit 51, and is fitted and fixed to the microphone fixing rib 44b.

  The mesh attaching surface 44c is desirably lower than the peripheral portion by the thickness of the water repellent mesh 54 (depressed). However, the mesh attaching surface 44c is made to be water repellent mesh due to problems such as rigidity of the case. In the case where it is difficult to reduce the thickness by the thickness of 54, it is possible to provide a height difference that allows positioning for attaching the water-repellent mesh 54 within the inner diameter of the rubber holder 52. Also in this embodiment, a water-repellent nonwoven fabric obtained by performing a water-repellent treatment on a nonwoven fabric made of fibers such as nylon or acrylic may be used instead of the water-repellent mesh 54.

  As described above, by fixing the water-repellent mesh 54 to the housing (key side case 44), the mounting height of the microphone 50 is not increased as in the first embodiment. Water resistance can be improved without reducing the shielding effect of electrical noise generated by itself.

  In each of the above embodiments, the case where the noise prevention structure of the present invention is applied to a mobile phone is shown. However, the present invention is not limited to the above embodiment, and any device including a microphone, for example, The present invention can be similarly applied to portable terminals such as PDAs (Personal Digital Assistants), transceivers, IC recorders, and portable game machines.

  The present invention can be used for any device including a microphone, in particular, a mobile phone.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front external view and a side external view of a mobile phone having a folding structure according to a first embodiment of the present invention. It is a block diagram which shows the structure of the mobile telephone based on 1st Example of this invention. It is explanatory drawing which shows the state which decomposed | disassembled the lower housing | casing of the mobile telephone based on 1st Example of this invention. It is the front external view and BB sectional drawing of the microphone of the mobile telephone which concerns on 1st Example of this invention. It is sectional drawing which shows the structure of the microphone of the mobile telephone based on 1st Example of this invention. It is sectional drawing which shows the specific attachment structure of the microphone of the mobile telephone which concerns on 1st Example of this invention. It is sectional drawing which shows the concrete attachment structure of the microphone of the mobile telephone which concerns on 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Upper housing | casing 3 Lower housing | casing 4 Hinge 5 Antenna 10 Control part 11 Memory | storage part 12 Wireless communication part 13 EL drive circuit 14 EL sheet 20 Display part 21 Speaker for reception 22 Speaker 23 Operation part 24 Camera 28 Circuit board 29 I / O connector 30 Microphone 31 Microphone unit 31a FET
31b Diaphragm 31c Capsule 31d Microphone sound hole 31e Printed circuit board 32 Rubber holder 32a Opening outer wall 33 Metal mesh 34 Water repellent mesh 40 Key sheet 41, 44 Key side case 41a, 44a Microphone sound hole 41b, 44b Microphone fixing rib 42 Back side Case 44c Mesh mounting surface 50 Microphone 51 Microphone unit 52 Rubber holder 53 Metal mesh 54 Water repellent mesh

Claims (9)

A portable terminal equipped with a microphone,
A portable terminal characterized in that a metal mesh and a water-repellent mesh or a water-repellent nonwoven fabric are arranged in this order on the surface of the microphone on the voice input side. A portable terminal equipped with a microphone,
A metal mesh is pasted on the voice input side of the microphone,
A mobile terminal, wherein a water-repellent mesh or a water-repellent nonwoven fabric is pasted on the metal mesh. A portable terminal equipped with a microphone,
The microphone is fixed to a housing having a sound hole for inputting sound on a surface of the sound input side,
In a region facing the sound hole on the housing side of the microphone, a metal mesh having a larger diameter than the sound hole is attached,
A portable terminal, wherein the water repellent mesh or the water repellent nonwoven fabric having a diameter larger than the sound hole is attached to a region including the sound hole on the microphone side of the housing.   A recess having a diameter larger than that of the sound hole is formed in a region including the sound hole on the microphone side of the casing, and the water-repellent mesh or the water-repellent nonwoven fabric is fixed in the recess. The mobile terminal according to claim 3. A portable terminal equipped with a microphone,
The microphone includes a microphone alone, a metal mesh disposed on a voice input side surface of the microphone alone, a rubber holder that covers the microphone and the metal mesh, and has an opening formed on the voice input side. A portable terminal comprising at least a water repellent mesh or a water repellent nonwoven fabric installed in the opening of the rubber holder and fixed to the metal mesh.   The mobile terminal according to claim 1, wherein the metal mesh is connected to a ground of the mobile terminal. A portable terminal equipped with a microphone,
The microphone is disposed on a circuit board near a noise generating component,
The microphone covers a single microphone housed in a metal capsule, a metal mesh disposed on a voice input side surface of the single microphone, and covers the single microphone and the metal mesh. A rubber holder having an opening formed therein, and a water repellent mesh or a water repellent nonwoven fabric installed in the opening of the rubber holder and fixed to the metal mesh,
The mobile terminal, wherein the metal mesh is connected to a ground of the circuit board through the capsule.   The mobile terminal according to claim 7, wherein the noise generating component is an EL sheet that illuminates the operation unit from the back surface.   9. The water repellent mesh is composed of a count different from the metal mesh, and the mesh of the mesh becomes fine by superimposing the water repellent mesh and the metal mesh. The portable terminal as described in any one.

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