JP5255391B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device having a waterproof function.

  In recent years, some mobile phones on the market have high airtightness in order to exhibit a waterproof function, for example. Since the casing constituting such a cellular phone is sealed, for example, when the casing is pressed by a key operation or the like, the air pressure inside the casing is increased. Then, the air pressure inside the housing tends to be larger than the air pressure outside the housing.

  Here, the mobile phone has a built-in speaker for outputting sound to the outside, and a sound emitting hole is formed on the side surface of the housing. Further, the speaker is provided with a diaphragm for converting an electrical signal into physical vibration, and the diaphragm vibrates to vibrate air and output sound from the sound emission hole.

  In the mobile phone having such a configuration, when the above-described key operation or the like is performed and the atmospheric pressure outside the housing becomes larger than the atmospheric pressure inside the housing, the speaker diaphragm protrudes outside the housing, An accurate sound cannot be output from the speaker.

In order to solve such a problem, for example, as described in Patent Document 1, means for providing an air hole on the surface of a housing is conventionally known. Further, a configuration in which the air hole is closed with an atmospheric pressure adjusting film made of a material that allows air to pass but not water can be considered.
JP-A-11-331967

  However, even though air holes having an air pressure adjusting film allow air to pass therethrough, the air permeability (ease of air passage) is low, and it is difficult for air to pass through compared to air holes not having an air pressure adjusting film. Therefore, when the air pressure inside the housing becomes larger than the air pressure outside the housing, it takes time until the air pressure inside the housing becomes equal to the air pressure outside the housing. Due to the phenomenon of projecting outside, accurate sound cannot be output from the speaker.

  In addition, there is a problem in that sound cannot be accurately detected even in a microphone provided inside the casing due to an action opposite to the above-described action (ie, the action of the speaker diaphragm projecting outside the casing).

  An object of the present invention is to provide an electronic device that has a speaker or a microphone and can perform suitable sound processing while being airtight.

In order to solve the above problems, an electronic device according to the present invention covers a housing having a first hole and the first hole, and has at least one property of dustproof and waterproof, A protective film that conducts sound; an acoustic vibration member that is disposed inside the housing and faces the first hole; and is disposed between the protective film and the acoustic vibration member. A fixing portion for keeping a distance between the protective film and the acoustic vibration member constant, and the fixing portion is provided inside the casing together with the protective film and the acoustic vibration member. A space is formed, and the housing has a second space which is a space other than the first space and the first space inside the housing, and the fixing portion includes the first space and the second space. It said second and space joint technique, the characteristics of the resonance frequency of the first space is in the acoustic vibration member A second hole portion which is formed so as to be lower than the frequency of the sound need characterized by the chromatic child.

  In the electronic apparatus, it is preferable that the second hole has a rectangular cross section.

  In the electronic device, it is preferable that a plurality of the second holes are formed.

  In the electronic apparatus, it is preferable that the second hole portion is disposed between the protective film and the acoustic vibration member and closer to the acoustic vibration member.

  Moreover, in the said electronic device, it is preferable that the said acoustic vibration member exhibits the function as a speaker or a microphone.

  ADVANTAGE OF THE INVENTION According to this invention, it has a speaker or a microphone and can perform suitable audio | voice processing, providing airtightness.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Hereinafter, a mobile phone device will be described as an example of an electronic device. However, the present invention is not limited to this, and a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a notebook personal computer. It may be another communication device provided with an antenna such as.

  FIG. 1 is an external perspective view of a mobile phone device 1 that is an example of a mobile electronic device according to the present invention that communicates with a host device. Note that the cellular phone device 1 has a waterproof function and is highly airtight and has a structure in which water does not enter the interior.

  As shown in FIG. 1, the cellular phone device 1 includes an operation unit side body 2 composed of a front case 2a and a rear case 2b, and a display unit side housing composed of a front case 3a and a rear case 3b. And a body part 3.

  The operation unit side body 2 has an operation key group 11 and a voice input hole 12 formed on the surface of the front case 2a. The operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input operation key 14 for inputting a telephone number and characters such as mail. And a determination operation key 15 for performing determination and scrolling in various operations. Further, the voice input hole 12 is formed so as to efficiently guide voice or the like uttered by the user of the mobile phone device 1 to a built-in microphone. The voice input hole 12 is closed by a material that allows air to pass but does not allow water to pass through, so that water does not enter. Further, a cap that covers an interface for communicating with an external device (for example, a host device) is provided on the side surface of the operation unit side body unit 2. The surface where the interface and the cap come into contact is waterproofed so that water does not enter from the outside.

  In addition, the display unit side body 3 is formed with a display 21 and a sound emission hole 22 for displaying various information on the front case 3a. The sound emission hole 22 is formed so as to efficiently output the voice of the other party of the call output by the receiver to the outside. Although details will be described later, the sound emitting hole 22 is closed by a material that allows air to pass but does not allow water to pass, and has a structure in which water does not enter.

  Moreover, the upper end part of the operation part side housing | casing part 2 and the lower end part of the display part side housing | casing part 3 are connected via the hinge mechanism 4 (connection part), as shown in FIG. In addition, the mobile phone device 1 moves the operation unit side body 2 and the display unit side body 3 connected via the hinge mechanism 4 relatively, thereby moving the surface of the operation unit side body 2. And the surface of the display unit side body 3 are folded so as to face each other so that the operation key group 11 is covered (closed), or the surface of the operation unit side body 2 and the display unit side body The operation key group 11 can be moved to an exposed state (open state) by exposing the surface of the part 3 to the outside and opening each other. In the present embodiment, the foldable mobile phone device 1 using the hinge mechanism 4 is described. However, the foldable mobile phone device 1 is not foldable. A slide type that is slid to the center, a rotary type that rotates one case around an axis along the overlapping direction, and a case where both cases 2 and 3 are connected via a biaxial hinge But it ’s okay. Moreover, the straight type whose form does not change may be used.

  Here, in the mobile phone device 1, during a call, the sound emitting hole 22 of the receiver of the display unit side body 3 is pressed against the ear, and the voice input hole 12 of the operation unit side body 2 is brought close to the mouth. For example, when it is difficult to hear the other party's voice, the sound emission hole 22 may be strongly pressed against the ear. In such a case, if the waterproof specification is highly airtight, the pressure inside the housing becomes higher than the pressure outside the housing due to the pressure on the display-side housing 3, and the receiver Pressure is applied to the constituting diaphragm, and the sound output from the receiver is distorted. The cellular phone device 1 according to the present invention is highly waterproof and waterproof, and distorts the sound output from the receiver even if the pressure inside the case is higher than the pressure outside the case. There is no configuration.

  Next, specific examples of the configuration according to the present invention will be described in detail with reference to the drawings. 2A is an exploded perspective view in which the periphery of the receiver when the display unit side body 3 of the mobile phone device 1 is viewed from the rear case 3b side is enlarged, and FIG. 2B is the display unit side. It is a top view when the housing | casing part 3 is seen from the rear case 3b side, FIG.2 (c) has shown sectional drawing when the display part side housing | casing part 3 is cut | disconnected by line segment BB. .

  As shown in FIG. 2, the mobile phone device 1 covers a housing (display unit side body 3) having a first hole 31 (hereinafter referred to as a sound emission hole 22) and the sound emission hole 22. , A protective film 32 having at least one of a dustproof property and a waterproof property and conducting sound, and an acoustic vibration member 33 (hereinafter, referred to as a sound emitting hole 22 disposed inside the housing and facing the sound emitting hole 22). A receiver 33), and a fixing portion 34 that is disposed between the protective film 32 and the receiver 33 and keeps the distance between the protective film 32 and the receiver 33 constant.

  The fixing part 34 forms a first space SP1 inside the housing together with the protective film 32 and the receiver 33. The housing has a first space SP1 and a second space SP2 that is a space of a portion other than the first space SP1 inside. Moreover, the fixing | fixed part 34 has the 2nd hole 35 which connects 1st space SP1 and 2nd space SP2. The first space SP1 has a resonance frequency lower than the frequency of the sound used in the receiver 33.

A suitable aperture of the second hole 35 will be described. According to the present invention, the receiver 33, the fixing portion 34, and the protective film 32 form a constant volume cavity. Here, the resonance frequency f (cav) of the cavity is determined by the equation (1) (the equation for deriving the resonance frequency of the Helmholtz resonator) (see FIG. 3).
f (cav) = (c / 2π) × √ (πa ² / V (L + a)) [Hz] (1)
However, c represents the speed of sound (34400 [cm / s]), a represents the radius [cm] of the opening, and L represents the wall thickness [cm] of the opening, V indicates the volume [cm ³ ] of the cavity.

  Here, the frequency band of a receiver or a microphone is generally 300 to 3400 [Hz] (voice band used in a telephone line). The frequency band of the speaker is 300 to 15000 [Hz] (frequency band of a speaker for a general mobile phone device).

Further, the frequency increases as the area (a ² π) of the diameter of the second hole 35 increases, and the frequency decreases as the length (L) of the diameter of the second hole 35 increases. Therefore, if the aperture of the second hole 35 is formed so that the resonance frequency f (cav) of the cavity is lower than the frequency band of the receiver 33, the sound output from the front surface of the receiver 33 is the second hole. The sound output from the back surface of the receiver 33 does not leak through the second hole 35 and does not leak into the first space SP1. Therefore, cancellation of sound can be prevented.

In the present invention, the diameter of the second hole portion 35 is set to a size that does not allow the resonance frequency f (cav) output by the acoustic vibration member 33 to pass even if air is introduced. For example, a may be set to 0.02 [cm], L may be set to 0.1 [cm], and V may be set to 4 [cm ³ ] (substituting these values into the equation (1), the resonance frequency f ( cav) is 252.2 [Hz].)

  According to such a configuration, in the mobile phone device 1, since the difference in atmospheric pressure does not occur between the first space SP <b> 1 and the second space SP <b> 2 due to the second hole portion 35, the receiver 33 is preferably used. Operate. In the present embodiment, the resonance frequency of the first space SP1 is about 250 [Hz], which is lower than the sound of 300 to 3400 (15000) [Hz] from which sound comes from the second space SP2. Therefore, even if the first space SP1 and the second space SP2 are connected by the second hole portion 35, canceling hardly occurs.

  Moreover, it is preferable that the shape of the 2nd hole part 35 is formed in the cross section with a rectangular shape.

  According to such a configuration, the mobile phone device 1 can more suitably prevent the receiver 33 from being cancelled.

  Further, as shown in FIG. 4, the second hole portion 35 is preferably formed by an air inlet hole portion 35a and an air outlet hole portion 35b.

  According to such a configuration, in the mobile phone device 1, since the air flow becomes smooth by providing two holes of the entrance and the exit, the receiver 33 can be operated more suitably, and the receiver 33 Cascading can be prevented.

  A plurality of second hole portions 35 are provided in the first hole portion 31. With this configuration, although some of the second hole portions 35 are prevented for reasons such as the layout of parts in the display unit side body portion 3, other second hole portions 35 are prevented. Since it does not peel off, the second hole 35 can suitably connect the first space SP1 and the second space SP2.

  The second hole 35 is preferably disposed closer to the acoustic vibration member 33 between the protective film 32 and the acoustic vibration member 33.

  According to such a configuration, since the air flow is smooth in the mobile phone device 1, the receiver 33 can be operated more suitably, and cascading of the receiver 33 can be prevented.

  The acoustic vibration member 33 preferably exhibits a function as a speaker or a microphone.

  In the present embodiment, the configuration of the receiver 33 has been described. However, the configuration of the receiver 33 is not limited to this. For the waterproof cellular phone device 1 with high airtightness, functions related to sound input and output (for example, a microphone, a speaker, and the like) are used. Even if it is applied, the effects of the present invention can be suitably exhibited.

The effects of the cellular phone device 1 are summarized as follows.
1. It is possible to reduce the acoustic load on the acoustic device due to the change in internal atmospheric pressure.
2. The atmospheric pressure can be adjusted with the acoustic porous film, and the porous film for adjusting the atmospheric pressure becomes unnecessary.
3. The quick response of the atmospheric pressure adjustment can be improved.

1 is an external perspective view of a mobile phone device according to the present invention. It is a schematic diagram when the display part side housing | casing part of the mobile telephone apparatus which concerns on this invention is seen from the rear case side. It is a figure where it uses for description about the method of deriving | requiring the resonant frequency f (cav) of a cavity. It is an exploded perspective view concerning other composition of the 2nd hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone apparatus 2 Operation part side housing | casing part 3 Display part side housing | casing part 22 Sound emission hole 31 1st hole part 32 Protective film 33 Acoustic vibration member 34 Fixing part 35 2nd hole part SP1 1st space SP2 2nd space

Claims (5)

A housing having a first hole;
A protective film covering the first hole, having at least one of dustproof and waterproof properties, and conducting sound;
An acoustic vibration member disposed inside the housing and disposed opposite to the first hole;
A fixing portion disposed between the protective film and the acoustic vibration member, and for maintaining a constant distance between the protective film and the acoustic vibration member,
The fixing portion forms a first space inside the housing together with the protective film and the acoustic vibration member,
The housing has a second space which is a space of a portion other than the first space and the first space inside the housing,
The fixing portion, wherein the first spatial second space and the joint technique, the characteristics of the resonance frequency of said first space, formed so as to be lower than the frequency of the sound used in the acoustic vibration member to have a second hole portion which is
Electronic equipment which is characterized a call.   The electronic device according to claim 1, wherein the second hole has a rectangular cross section.   The electronic device according to claim 1, wherein a plurality of the second holes are formed.   4. The electronic apparatus according to claim 1, wherein the second hole portion is disposed between the protective film and the acoustic vibration member, more than the acoustic vibration member. 5. .   The electronic apparatus according to claim 1, wherein the acoustic vibration member exhibits a function as a speaker or a microphone.

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