JP2010245920A - Explosion-proof ip mobile phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an explosion-proof IP mobile phone capable of preventing deterioration in telephone call quality associated with the anti-explosion measure while having explosion-proof performance. <P>SOLUTION: An internal loudspeaker 3 of the IP mobile phone is exposed to the outside from a housing 2 of the IP mobile phone, and the internal loudspeaker 3 is arranged at a position opposed to a sound transmission member 44 while being spaced apart from the housing 2 of the IP mobile phone, thereby making a sound received through the internal loudspeaker 3 hard to reach an internal microphone by transmission through the housing 2 of the IP mobile phone. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an explosion-proof IP mobile phone that can be used even in an explosion dangerous atmosphere where flammable gas or flammable dust exists.

  In a factory where an explosion danger atmosphere exists, for example, a PHS (Personal Handy-phone System) terminal having an explosion-proof structure may be used in order to communicate between the inside and outside the factory. However, the frequency and time that can be used per PHS terminal is limited, and because the communication speed is as low as 128 kbps at the maximum, it is not possible to perform large capacity data communication such as video information, Since a dedicated antenna has to be installed, there are problems such as increased costs for infrastructure development.

  In order to solve such problems, the present applicant has developed an explosion-proof IP (Internet Protocol) mobile phone (see Patent Document 1). However, in this explosion-proof IP mobile phone, the width of the joint surface between the case body and the cover is increased (for example, 10 mm) in order to prevent flames and sparks from leaking outside when an explosion occurs inside. Furthermore, since it has a robust structure that can withstand the explosion pressure, it has become larger and heavier (about 900 to 1,000 g).

As a result of such folding and revision of the explosion-proof guideline, if the internal free space has a volume of 20 cm ³ or less, the joint surface between the case body and the cover, which has been specified in the past, is assumed on the premise of non-ignition explosion-proof structure. Conditions such as width have been excluded, and it has become possible to reduce the size and weight. Therefore, the applicant of the present application has just developed an explosion-proof IP mobile phone corresponding to the revision of the explosion-proof guidelines. In this regard, Japanese Patent Application No. 2009-32552 has been filed.

  This explosion-proof IP mobile phone can satisfy the non-ignition explosion-proof structure by a metal having an explosion-proof performance in the case for storing the IP mobile phone, and can be made compact and lightweight, and can have excellent portability. Further, by adopting a simple configuration in which the IP mobile phone is simply housed in the explosion-proof case, the IP mobile phone can be easily replaced, and the workability of maintenance and repair can be improved. Yes.

JP 2008-61054 A

  By the way, in the IP mobile phone, in a mutual call state, a phenomenon occurs in which the voice emitted from itself returns to the IP mobile phone again as an echo sound via the other party's IP mobile phone. Since IP packets are converted into IP packets and routed through network devices such as routers and switches, and IP networks, echo delays are remarkably generated. If an IP phone is explosion-proof, it is sealed in a sturdy metal case, so that the sound and vibrations emitted from the built-in speaker are transmitted to the built-in microphone without radiating to the outside, and the echo sound tends to increase. May cause trouble to the call.

  As countermeasures, methods such as lowering the sensitivity of the built-in microphone of the IP mobile phone or lowering the volume of the built-in speaker can be considered. However, these methods have a problem that it is difficult to hear the call itself.

  Therefore, an object of the present invention is to provide an explosion-proof IP mobile phone that has explosion-proof performance and can prevent deterioration in call quality due to explosion-proofing.

  An explosion-proof IP mobile phone according to the present invention includes an IP mobile phone including a transmitter, a receiver, and a key operation unit, and an explosion-proof case that houses the IP mobile phone. Through-holes are formed in each part of the explosion-proof case facing the head and the key operation part, and a sound transmitting member having explosion-proof performance is fitted in the through-holes facing the transmission part and the reception part, and the penetration facing the key operation part An explosion-proof IP mobile phone in which a push button having explosion-proof performance in a hole is fitted in a projecting / retracting manner while isolating the inside and the outside, and the built-in speaker of the IP mobile phone is exposed to the outside from the housing of the IP mobile phone, The built-in speaker is arranged at a position facing the sound transmitting member while maintaining a state of being separated from the housing of the IP mobile phone.

  By storing the IP mobile phone in the explosion-proof case, the voice (sound and vibration) received through the built-in speaker in the receiver is output to the outside of the explosion-proof case through the voice transmitting member and at the same time It will be input to the built-in microphone in the transmission section through the housing. When this occurs in the other party's IP mobile phone, a phenomenon occurs in which the voice uttered by itself returns to the IP mobile phone again as an echo sound via the other party's IP mobile phone.

  However, in the explosion-proof IP mobile phone having the above configuration, the built-in speaker in the receiver of the IP mobile phone is exposed to the outside from the housing of the IP mobile phone, and the built-in speaker is separated from the housing of the IP mobile phone. Since it is disposed at a position facing the sound transmitting member while maintaining, a part of the sound (sound and vibration) received through the built-in speaker in the receiving unit is output to the outside of the explosion-proof case through the sound transmitting member. However, it is difficult to be transmitted to the housing of the IP mobile phone. Accordingly, since it is reduced that the received voice is input to the built-in microphone, the voice emitted from itself returns to the IP mobile phone as an echo sound again via the other party's IP mobile phone. Is suppressed, and deterioration of call quality due to explosion prevention can be prevented.

  In the explosion-proof IP mobile phone according to the present invention, a recess is formed on the inner surface of the explosion-proof cover so as to communicate with a through-hole facing the receiver and accommodate a built-in speaker. It is preferable that a built-in speaker exposed from the housing is disposed.

  According to such a configuration, the voice (sound or vibration) received through the built-in speaker passes through the through hole through the sound transmitting member from the recess and is output to the outside of the explosion-proof case. Not only can a storage space be created, but the built-in speaker is isolated in the recess to make it difficult to be transmitted to the housing of the IP mobile phone.

  In the explosion-proof IP mobile phone according to the present invention, it is more preferable that the vibration control material is disposed so as to close the opening of the recess.

  According to such a configuration, the sound in the recess is not leaked from the recess except that it is output to the outside of the explosion-proof case through the through hole, so that it is difficult to be transmitted to the housing of the IP mobile phone.

  In addition, the explosion-proof IP mobile phone according to the present invention may employ a configuration in which the built-in speaker is attached to a base disposed in the recess, and the base is fixed to the housing of the IP mobile phone via a vibration damping material. it can.

  According to such a configuration, the built-in speaker is kept separated from the housing of the IP mobile phone by the base, and the base is fixed to the housing of the IP mobile phone via the vibration damping material, so that the built-in speaker is separated from the built-in speaker. Is not transmitted to the IP mobile phone housing through the base.

  Further, in the explosion-proof IP mobile phone according to the present invention, it is more preferable that a sound absorbing material is loaded in the recess. According to such a configuration, the effect can be further enhanced.

  The explosion-proof case is more preferably a case main body provided with an opening so that an IP mobile phone including a transmission / reception unit, a display unit, a transmission unit, a reception unit, and a key operation unit can be stored and taken out, and a case A case that includes a cover that closes the opening of the main body, the case main body and the cover are molded of a metal having explosion-proof performance, and faces the transmission / reception unit, display unit, transmission unit, reception unit, and key operation unit of the IP mobile phone A through-hole is formed in each part of the main body or cover, a radio wave transmitting member having explosion-proof performance is fitted in the through-hole facing the transmitting / receiving unit, and a translucent member having explosion-proof performance is fitted in the through-hole facing the display unit. A sound transmitting member having explosion-proof performance is fitted in the through hole facing the transmitting section and the receiving section, and a metal push button having explosion-proof performance is isolated from the inside and outside in the through hole facing the key operation section. Structure to be fitted freely entering and leaving out-is employed.

  According to such a configuration, the case main body and the cover can be reduced in size and have a non-ignition explosion-proof structure by the metal having explosion-proof performance. A through hole is formed in a portion of the case main body or cover facing the transmitting / receiving unit of the IP mobile phone, and an electromagnetic wave transmitting member having explosion-proof performance is fitted into the through hole, so that the case main body and the cover are made of metal. However, the IP mobile phone can transmit and receive radio waves.

  A through hole is formed in a portion of the case body or cover facing the display unit of the IP mobile phone, and a translucent member having explosion-proof performance is fitted into the through hole, so that the case body and the cover are made of metal. However, the information displayed on the display unit of the IP mobile phone can be viewed.

  And a through-hole is formed in the part of the case main body or cover facing the transmitting part and the receiving part of the IP mobile phone, and a sound transmitting member having explosion-proof performance is fitted into the through-hole, whereby the case main body and the cover are You can talk even if it is made of metal. A through hole is formed in the case body or cover part facing the key operation part of the IP mobile phone, and a metal push button having explosion-proof performance is fitted into the through hole so as to protrude and retract freely while isolating the inside and outside. Thus, even if the case body and the cover are made of metal, the key operation unit of the IP mobile phone can be operated.

  In the explosion-proof case, it is preferable that a flange for placing the front-side peripheral edge of the radio wave transmitting member and / or the light transmitting material is provided in a through hole into which the radio wave transmitting member and / or the light transmitting material is fitted.

  According to such a configuration, since the flange is provided in the through hole into which the radio wave transmitting member and / or the light transmitting material is fitted, the radio wave transmitting member and / or the light transmitting material is unlikely to fall off from the through hole of the case body and the cover. Can be.

  Further, in the explosion-proof case, a through hole is formed in a portion of the case body or cover that faces the ring tone generation unit of an IP mobile phone including a ring tone generation unit that generates a ring tone, and the explosion-proof performance is formed in the through hole. It is preferable that a sound transmitting member having

  According to this configuration, when the IP mobile phone generates a ring tone, the through hole is formed in the case main body or the cover portion facing the ring tone generating portion, and the sound transmitting member is fitted into the through hole. Even if the case body and the cover are made of metal, the ringtone can be heard.

  Further, in the above explosion-proof case, an opening is provided in a case main body or a cover portion facing a charging terminal provided in the IP mobile phone, and a metal lid having explosion-proof performance is detachably attached to the opening. It is preferable.

  According to this configuration, the metal lid is detachably attached to the opening provided in the case main body or the cover, so that the charging terminal provided in the IP mobile phone can be directly charged with the lid removed. A connector can be connected, and an explosion-proof performance can be exhibited by attaching a lid.

  Further, in the explosion-proof case, it is preferable that a flexible sheet following the protrusion / retraction of the push button is interposed between the IP mobile phone and the push button, and the push button is bonded to the sheet.

  According to such a configuration, a flexible sheet body is interposed between the IP mobile phone and the push button, and the push button is adhered to the sheet, thereby simplifying the function of preventing the push button from falling off the case body or the cover. can do.

  According to the present invention, the built-in speaker in the receiving unit of the IP mobile phone is exposed to the outside from the housing of the IP mobile phone, and the sound transmitting member is maintained while the built-in speaker is separated from the housing of the IP mobile phone. Since the voice received through the built-in speaker is less likely to reach the built-in microphone in the transmitting unit through the housing of the IP mobile phone, the voice that is uttered can be transmitted to the other party's IP. The phenomenon of returning as an echo sound to the IP mobile phone again via the mobile phone is suppressed, and the deterioration of call quality due to explosion prevention can be prevented.

The exploded perspective view seen from the back side of the explosion-proof IP mobile phone concerning one embodiment of the present invention is shown. The perspective view which looked at the explosion-proof IP mobile phone from the front side is shown. The perspective view which looked at the explosion-proof IP mobile phone from the back side is shown. A sectional side view of the explosion-proof IP mobile phone is shown. It is a built-in speaker part of the explosion-proof IP mobile phone, wherein (a) shows an enlarged cross-sectional top view of the main part and (b) shows an enlarged cross-sectional side view of the main part. The cross-sectional side view of the explosion-proof IP mobile phone which concerns on another embodiment is shown. It is a built-in speaker part of the explosion-proof IP mobile phone, wherein (a) shows an enlarged cross-sectional top view of the main part and (b) shows an enlarged cross-sectional side view of the main part. Furthermore, the cross-sectional side view of the explosion-proof IP mobile phone which concerns on another embodiment is shown. It is a built-in speaker part of the explosion-proof IP mobile phone, wherein (a) shows an enlarged cross-sectional top view of the main part and (b) shows an enlarged cross-sectional side view of the main part.

An embodiment of an explosion-proof IP mobile phone according to the present invention will be described with reference to FIGS. The explosion-proof IP mobile phone according to this embodiment includes an IP mobile phone 1 and an explosion-proof case 5 that mainly includes a case main body 10 that houses the IP mobile phone 1, a cover 20, and a lid 30. By inner free space of the explosion-proof casing 5 is a 20 cm ³ or less, explosion-proof IP mobile phone, it is possible to realize a non-ignition explosion-proof construction, is lightweight, about 300 to 400 g.

  An IP mobile phone (hereinafter simply referred to as “telephone”) 1 is a telephone that makes a call by transmitting and receiving voice signals and the like through an IP (Internet Protocol) network. The telephone 1 communicates by connecting to an IP network using a wireless communication system such as a wireless LAN. The telephone 1 can make a call using a wireless LAN network that has already been established, as well as data, images, and the like. Is transmitted and received, and the information can be displayed on the display unit.

  Although not shown in the figure, the telephone 1 includes a transmission / reception unit (antenna) for transmitting and receiving radio waves on the upper side, a display unit, a transmission unit, a reception unit, and a key operation unit on the front side. Are provided with a power switch and a touch-type volume, a ringing tone generator is provided on the back side, and a charging terminal is provided on the bottom side.

  A case body 10 for storing the telephone 1 is formed in a substantially box shape by a top surface portion 11, a front surface portion 12, and a pair of side surface portions 13 and 14, and openings 15 and 16 are provided on the back side and the bottom surface side. . The inner size of the case body 10 is substantially the same as the outer size of the telephone 1, and the top surface portion, front surface portion, and side surface portion of the telephone body 1 are the top surface portion 11, front surface portion 12, and side surface portions 13, 14 of the case main body 10. It is made to contact | abut with each inner surface.

  The cover 20 closes the opening 15 on the back side of the case body 10, and both sides abut against the back of the side surfaces 13, 14 of the case body 10, and are fastened by fastening jigs 21, 21,. Is done. Although not shown, a seal may be interposed between the cover 20 and the case body 10 to further improve the airtightness between the cover 20 and the case body 10.

  The lid 30 closes the opening 16 on the bottom surface side of the case body 10, and the peripheral edge abuts against the front surface 12, the side surfaces 13, 14 and the bottom surface of the cover 20 to seal the telephone 1. It will be in the state. An L-shaped claw 31 protrudes from the inner surface of one side of the lid 30, and a rotary shaft 32 penetrates through the other side of the lid 30. Is attached.

  On the other hand, grooves 17 are formed on the inner surfaces of the case body 10 near the bottom surface of one and the other side surfaces 13, 14, and the claws 31 and the locking pieces 33 of the lid 30 are formed in the respective grooves 17, 17. It is supposed to be in attendance. In order to prevent the claw 31 and the locking piece 33 from interfering with the telephone set 1, a spacer 19 that supports the bottom face of the telephone set 1 is provided on the inner surface of the front portion 12 of the case body 10.

  And through hole 11a, 20a is formed in the site | part which is the top | upper surface part 11 of case main body 10, and cover 20, and opposes the transmission / reception part of telephone 1, Tempered glass which has explosion-proof performance in this through hole 11a, 20a. A radio wave transmitting member 41 made of polycarbonate or polycarbonate is fitted.

  A through hole 12a is formed in the front portion 12 of the case main body 10 at a portion facing the display portion of the telephone 1, and the transparent light formed from tempered glass or polycarbonate having explosion-proof performance in the through hole 12a. The member 42 is fitted.

  As shown in FIG. 4, the front side peripheral portions of the radio wave transmitting member 41 and the translucent member 42 are placed in the through holes 11a and 20a into which the radio wave transmitting member 41 is fitted and the through hole 12a in which the translucent member 42 is fitted. Flanges 11b, 20b, and 12b are provided to prevent the radio wave transmitting member 41 and the light transmitting member 42 from falling off the through holes 11a, 20a, and 12a. The adhesive 43 is filled between the outer peripheral surface of the radio wave transmitting member 41 and the inner peripheral surface of the through holes 11a and 20a and between the outer peripheral surface of the translucent member 42 and the inner peripheral surface of the through hole 12a. The radio wave transmitting member 41 and the light transmitting member 42 are bonded in the through holes 11a, 20a, and 12a.

  In addition, the back surfaces of the radio wave transmitting member 41 and the light transmitting member 42 are made to be the same surface as the back surfaces of the case body 10 and the cover 20 or slightly recessed so as not to contact the telephone 1. Further, the case body 10 and the cover 20 are thickened so as to be thickened around the flanges 11b, 20b, and 12b so that the case body 10 and the cover 20 are not thinned by the thickness of the radio wave transmitting member 41 and the light transmitting member 42. It is designed to ensure a high explosion-proof performance. However, the case body 10 and the cover 20 as a whole may have the same thickness as the periphery of the flanges 11b, 20b, and 12b.

  Further, the inner dimensions of the through holes 11a and 20a into which the radio wave transmitting member 41 is fitted are smaller than the outer diameter of a steel ball used in the performance test, so that the steel ball does not collide with the radio wave transmitting member 41, or When the through holes 11a and 20a are made larger than the outer diameter of the steel ball, the radio wave transmitting member 41 having a strength that can withstand the test is used.

  And through-holes 12c and 12d are formed in the front part 12 of the case main body 10, and the parts facing the transmitting and receiving parts of the telephone set 1 (see FIGS. 2 and 4), and these through-holes 12c and 12d. The sound transmitting members 44 and 44 having explosion-proof performance are fitted into the. These through holes 12c and 12d are small holes through which sound can pass, so that the explosion-proof performance is not affected. For the sound transmitting members 44, 44, for example, a sintered wire mesh is used. Between the outer peripheral surfaces of the sound transmitting members 44 and 44 and the inner peripheral surfaces of the through holes 12c and 12d, granular elastic members 45 formed of silicon rubber or the like are fitted into a plurality of locations, or a viscous material is formed. The sound transmitting members 44 and 44 are embedded in the entire circumference so as not to fall out of the through holes 12c and 12d.

  Further, through holes 12e, 12e,... Are formed in the front portion 12 of the case body 10 at portions facing the key operation portions such as the cross key and numeric / character keys of the telephone 1, and the through holes 12e, 12e are formed. ,... Are fitted with a metal push button 46 having explosion-proof performance so as to protrude and retract while isolating the inside and outside. These through holes 12e, 12e,... Have the same shape as the cross key and numerical / character keys, and are arranged vertically and horizontally.

  Between the push button 46 and the telephone 1, a flexible sheet 47 that follows the protrusion / retraction of the push button 46 is interposed. The sheet 47 is made of, for example, silicon rubber having excellent durability.

  Further, on the back surface of the push button 46, for example, a protrusion 46a is projected, and a small hole 47a for fitting the protrusion 46a is formed in the sheet 47. The protrusion 46a of the push button 46 is fitted in the small hole 47a of the sheet 47, It is adhered by an adhesive (not shown) so that the push button 46 does not fall out of the through hole. Therefore, the sheet 47 may be omitted by providing a collar on the back surface of the push button 46.

  Then, through holes 14a and 14a are formed in the other side surface portion 14 of the case main body 10 and facing the power switch and the touch-type volume of the telephone 1, and the through holes 14a and 14a have explosion-proof performance. Metal push buttons 48 and 48 are fitted so as to protrude and retract while being isolated from each other. Between the push buttons 48, 48 and the telephone 1, a flexible sheet 47 that follows the protrusion / retraction of the push buttons 48, 48 is interposed. Further, a protrusion (not shown) protrudes from the back surface of the push button 48, a small hole 47a is formed in the sheet, the protrusion is fitted into the small hole 47a, and is adhered by an adhesive. 14a is prevented from falling off.

  And the through-hole 20c is formed in the site | part which the cover 20 opposes the ringtone generation | occurrence | production part of the telephone 1, and the sound transmission member 49 which has explosion-proof performance is inserted in this through-hole 20c (refer FIG. 4). The through hole 20c is formed with a plurality of small holes such as pinholes through which sound can pass, so that the explosion-proof performance is not affected. For the sound transmission member 49, for example, a sintered wire mesh is used. Between the outer peripheral surface of the sound transmitting member 49 and the inner peripheral surface of the through hole 20c, granular elastic members 45 formed of silicon rubber or the like are fitted into a plurality of locations, or a viscous material is embedded in the entire periphery. Thus, the sound transmitting member 49 is prevented from falling off the through hole 20c.

  Here, characteristic parts of the explosion-proof IP mobile phone according to the present embodiment will be described with reference to FIG. This is because the built-in speaker 3 in the receiver of the telephone 1 is exposed to the outside from the housing 2 of the telephone 1, and the built-in speaker 3 is kept away from the housing 2 of the telephone 1, while It is arrange | positioned in the position which opposes. A recess 12f is formed on the inner surface of the explosion-proof cover 5 (front portion 12 thereof) so as to communicate with the through hole 12d and accommodate the built-in speaker 3. The built-in speaker 3 is disposed in the recess 12f. It is like that.

  More specifically, the built-in speaker 3 is attached to a base 50 disposed in the recess 12 f, and the base 50 is fixed to the housing 2 of the telephone 1 via a vibration damping material 51. The base 50 is a plate-shaped member made of, for example, metal or resin, and has a pair of leg portions that are appropriately bent. Further, a damping material 51 such as butyl rubber is attached to the leg portion, and the base 50 is attached to the housing 2 of the telephone 1 via the damping material 51. Note that the damping material 51 is attached to the base 50 and the damping material 51 is attached to the housing 2 by an adhesive, a pressure-sensitive adhesive, an adhesive sheet, a pressure-sensitive adhesive sheet, or the like.

  Since the built-in speaker 3 is exposed to the outside from the housing 2 of the telephone 1, a lead wire 3a for signal transmission is disposed across the inside and outside of the housing 2 through the through hole 2a of the housing 2, and one end thereof is Connected to the built-in speaker 3 and the other end is connected to a predetermined circuit in the telephone 1. As an example, in a commercially available telephone, a method of opening the housing and taking out the built-in speaker, once cutting the wiring of the built-in speaker, passing the lead wire into and out of the housing, and reconnecting the built-in speaker to the lead wire Can be taken.

  The base 50 has a substantially U-shape, and the built-in speaker 3 is attached inside the recessed portion. In addition, a through hole 50 a is formed in the recessed portion at a position facing the built-in speaker 3, and the built-in speaker 3 faces the sound transmitting member 44 across the through hole 50 a. Accordingly, the voice (sound or vibration) received from the built-in speaker 3 passes through the through hole 50a from the recess 12f to the through hole 12d through the sound transmitting member 44, and comes out of the explosion-proof case 5 from here. ing. Note that the sound transmitting member 44 is disposed between the recess 12f and the through hole 12d, and therefore, between the recess 12f and the through hole 12d, the second is larger than the recess 12f and larger than the through hole 12d. Is formed, and the sound transmitting member 44 is disposed in the recess.

  Thus, according to the explosion-proof IP mobile phone according to the present embodiment, the built-in speaker 3 of the telephone 1 is exposed to the outside from the housing 2 of the telephone 1, and the built-in speaker 3 is separated from the housing 2 of the telephone 1. The sound (sound and vibration) received from the built-in speaker 3 goes out of the explosion-proof case 5 through the sound transmitting member 44 because the sound transmitting member 44 is disposed at a position facing the sound transmitting member 44 while maintaining the above state. Although it is confined in the explosion-proof case 5 except for the portion, it is difficult to be transmitted to the housing 2 of the telephone 1. Furthermore, since the sound from the built-in speaker 3 is isolated within the recess 12f except for a part that goes out of the explosion-proof case 5 through the sound transmitting member 44, it is difficult for the sound to be transmitted to the housing 2 of the telephone set 1. .

  Therefore, according to the explosion-proof IP mobile phone according to the present embodiment, since the received voice is reduced from being input to the built-in microphone of the telephone 1, the uttered voice is again transmitted via the other party's telephone. The phenomenon of returning to the telephone as an echo sound is suppressed, and it is possible to prevent deterioration in call quality due to explosion prevention.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, as the configuration in which the built-in speaker 3 is arranged outside the housing 2 of the telephone 1, the one shown in FIGS. Here, the base 50 has a sealed box shape, and the built-in speaker 3 is disposed inside the base 50. The recess 12 f is recessed in a square shape so that the base 50 can be accommodated. Further, on one surface of the base 50, a damping material 51 made of a sheet-like material such as butyl rubber having a size corresponding to the size (that is, a size that substantially closes the opening of the recess 12f) is attached. By attaching the seismic material 51 to the housing 2 of the telephone 1, the housing 2 of the telephone 1 and the base 50 having the built-in speaker 3 built therein are integrated. Incidentally, the lead wire 3a of the built-in speaker 3 is made to pass through a small hole formed in the base 50.

  Further, as another configuration in which the built-in speaker 3 is disposed outside the housing 2 of the telephone 1, the one shown in FIGS. 8 and 9 can be employed. Here, the concave portion 12f is formed in a mortar shape (tapered shape that expands toward the opening side), and the built-in speaker 3 is directly attached to the sound transmitting member 44 without passing through the base 50 (that is, not indirectly). In contact. The recess 12f is loaded with a sound absorbing material 52 such as sponge, for example, so that the built-in speaker 3 is not displaced.

  The sound absorbing material 52 can also be applied to the above embodiment or the embodiment shown in FIGS. In addition, the shape, size, and location of the damping material 51 can be appropriately selected within the scope of the object of the present invention, and the damping material 51 is not necessarily required.

  DESCRIPTION OF SYMBOLS 1 ... IP mobile phone, 2 ... Housing, 2a ... Through-hole, 3 ... Built-in speaker, 3a ... Lead wire, 5 ... Explosion-proof case, 10 ... Case main body, 11 ... Top surface part, 11a ... Through-hole, 11b ... Flange, 12 ... Front part, 12a ... Through hole, 12b ... Flange, 12c, 12d ... Through hole, 12e ... Through hole, 12f ... Recessed part, 13, 14 ... Side face part, 14a ... Through hole, 15, 16 ... Opening part, 17 ... Groove, 19 ... spacer, 20 ... cover, 20a ... through hole, 20b ... flange, 20c ... through hole, 21 ... fastening jig, 30 ... lid, 31 ... claw, 32 ... rotating shaft, 33 ... locking piece, DESCRIPTION OF SYMBOLS 41 ... Radio wave transmission member, 42 ... Light transmission member, 43 ... Adhesive agent, 44 ... Sound transmission member, 45 ... Elastic member, 46 ... Push button, 46a ... Projection, 47 ... Sheet, 47a ... Small hole, 48 ... Push button, 49 ... sound transmitting member, 50 ... base, 5 a ... through hole, 51 ... Damping material, 52 ... sound absorbing material

Claims (5)

  An IP mobile phone including a transmitter, a receiver, and a key operation unit, and an explosion-proof case that houses the IP mobile phone, and an explosion-proof case that faces the transmitter, receiver, and key operation unit of the IP mobile phone. A through hole is formed in each part, and a sound transmission member having explosion-proof performance is fitted into the through-hole facing the transmitting and receiving parts, and a push button having explosion-proof performance is isolated from the inside and outside in the through hole facing the key operation part. An explosion-proof IP mobile phone that is fitted in such a manner that it can be protruded / retracted while the built-in speaker of the IP mobile phone is exposed to the outside from the housing of the IP mobile phone, and the built-in speaker is separated from the housing of the IP mobile phone An explosion-proof IP mobile phone, wherein the explosion-proof IP mobile phone is disposed at a position facing the sound transmitting member while maintaining the above state.   2. The explosion-proof IP mobile phone according to claim 1, wherein a recess is formed on the inner surface of the explosion-proof cover so as to communicate with a through-hole facing the receiver and accommodate a built-in speaker, and the built-in speaker is disposed in the recess. Phone.   The explosion-proof IP mobile phone according to claim 2, wherein the vibration control material is arranged so as to close the opening of the recess.   The explosion-proof IP mobile phone according to claim 2 or 3, wherein the built-in speaker is attached to a base disposed in the recess, and the base is fixed to a housing of the IP mobile phone via a vibration control material.   The explosion-proof IP mobile phone according to any one of claims 2 to 4, wherein a sound absorbing material is loaded in the recess.

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