JP4080903B2 - Electroacoustic transducer structure and portable terminal device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electroacoustic transducer structure including an electroacoustic transducer including a speaker and a microphone inside a casing, and a portable terminal device including the electroacoustic transducer structure.
[0002]
[Prior art]
Conventionally, as an electroacoustic conversion unit, an electroacoustic transducer that converts an electric signal into sound or converts sound into an electric signal, such as a speaker or a microphone, is provided inside the case, and the sound is transferred to the case. There is a case in which a sound passage hole for propagating in and out is formed in the housing (for example, see Patent Document 1). The sound hole is opened on the surface of the housing.
Such an electroacoustic conversion unit structure is often applied particularly to portable terminal devices such as portable mobile phones, PDAs (Personal Digital Assistants), and notebook personal computers.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-201388
[Problems to be solved by the invention]
However, the conventional structure of the electroacoustic transducer has a problem in that foreign matters such as dust, dust, and liquid are liable to enter because the sound holes are opened on the surface. In particular, the mobile terminal device is often used outdoors where there is a lot of dust, dust, and the like, and when it gets wet by rain, the electroacoustic transducer is damaged.
[0005]
The present invention has been made in view of the above-described circumstances, and has an electroacoustic transducer structure that can reduce the intrusion of dust, dust, and the like from a sound passage hole and suppress damage to the electroacoustic transducer, and An object is to provide a mobile terminal device provided.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 includes a housing and an electroacoustic transducer provided in the housing, and a recess having at least two side wall surfaces is formed on the surface of the housing, and the side A through hole is formed in one of the wall surfaces, and an inclined surface that extends from the bottom surface of the recess to the housing surface is formed on the other side wall surface so as to face the through hole, and the electroacoustic transducer The through hole communicates with the through hole .
[0007]
The invention according to claim 2 is the electroacoustic transducer according to claim 1, characterized in that one of the side wall surfaces is formed substantially perpendicular to the surface of the housing.
[0008]
The invention according to claim 3 is the electroacoustic transducer according to claim 1 or 2, wherein the electroacoustic transducer is a speaker or a microphone .
[0009]
The invention according to claim 4 is characterized in that the electroacoustic transducer structure according to any one of claims 1 to 3 is provided in a casing to constitute a mobile terminal device.
[0010]
According to a fifth aspect of the present invention, in the portable terminal device according to the fourth aspect, the casing includes two casings that can be overlapped with each other, and the two casings are in a reference axis along the overlapping direction. The electroacoustic transducer structure is disposed on the surface side opposite to the overlapping surface facing when the two casings are overlapped with each other. It is arranged in the vicinity of a reference axis, and the recess is formed in an annular shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 3 show an embodiment according to the present invention, and the embodiment described here is a case where the present invention is applied to a mobile phone. As shown in FIG. 1, a mobile phone (mobile terminal device) 1 according to this embodiment includes a first housing 2 and a second housing that can be superimposed on the surface 2a of the first housing 2. 3 and these two casings 2 and 3 are connected to each other so as to be rotatable around a first axis L1 orthogonal to the surface 2a of the first casing 2, and the second casing 3 is And a connecting means 5 that swingably connects around a second axis L2 orthogonal to the axis L1.
[0012]
On the surface 2 a of the first housing 2, an operation unit 7 including various pressable operation keys such as a call key, an end key, and a numeric key is provided. In addition, a microphone portion 9 is provided on the front end portion 2b (the end portion on the side opposite to the connecting means 5) of the first casing 2 in the surface 2a. The operation unit 7 and the microphone unit 9 are covered with the second housing 3 in a state where the first and second housings 2 and 3 are overlapped and closed.
[0013]
A display unit 11 that displays various types of information is provided on the surface 3 a of the second housing 3. In addition, a first speaker portion 13 is provided at the front end portion 3b (the end opposite to the connection means 5) of the second housing 3 in the surface 3a, and a second housing in which the connection means 5 is located. A second speaker unit (electroacoustic conversion unit) 15 is provided at the base end 3 c of the body 3.
The display unit 11 and the two speaker units 13 and 15 are exposed to the outside regardless of whether the two casings 2 and 3 are opened or closed. The first speaker unit 13 is used when talking with the microphone unit 9 in the open state. In addition, the second speaker unit 15 is used when talking with the microphone unit 9 in the closed state. The first and second speaker units 13 and 15 are also used to notify information such as incoming calls, reception of e-mails, and alarms by sound.
FIG. 1C illustrates a state in which the front surface 2a of the first housing 2 and the back surface (overlapping surface) 3e located on the back side of the front surface 3a of the second housing 3 are in contact with each other. Although shown, actually, a minute space is provided between the front surface 2a and the back surface 3e.
[0014]
By the way, as shown in FIGS. 2 and 3, the second speaker portion 15 is formed on the wall portion 18 constituting the surface 3 a of the second housing 3, and has an annular shape recessed inward from the surface 3 a. The concave portion 17, the two through holes 21 and 23 formed in the inner wall portion 17 a of the concave portion 17, and the second housing 3 are provided at positions facing the two through holes 21 and 23. An electroacoustic transducer 19 as a fixed speaker and a sound passage hole 24 for guiding the sound from the electroacoustic transducer 19 to the two through holes 21 and 23 are provided. In addition, the electroacoustic transducer 19 in this embodiment converts an electric signal into sound, and is arrange | positioned so that a sound may be generated toward the wall part 18 from the surface 19a.
[0015]
The inner wall portion 17 a of the recess 17 is formed substantially perpendicular to the surface 3 a of the second housing 3. Further, the surface (side wall surface) 17e of the outer wall portion 17b facing the surface (side wall surface) 17d of the inner wall portion 17a spreads outward from the bottom surface 17c of the recess 17 toward the surface 3a of the second housing 3. It is an inclined surface. Therefore, with the above configuration, the sound generated from the electroacoustic transducer 19 is emitted through the two through holes 21 and 23 formed in the inner wall portion 17a, and the emitted sound is outside the inclined side. By reflecting on the wall portion 17b, it is propagated in a direction away from the surface 3a of the second housing 3.
[0016]
An annular projecting wall 25 projecting in the direction of the first axis L1 is formed on the inner surface 3f located on the back side of the surface 3a of the wall 18 of the second housing 3. The front end portion 25 a of the protruding wall portion 25 is in contact with the surface 19 a side of the electroacoustic transducer 19. By this protruding wall portion 25, the space between the electroacoustic transducer 19 and the through holes 21 and 23 is isolated from the other internal space of the second housing 3 and used as the sound passage hole 24. Yes.
[0017]
The connecting means 5 is disposed in the vicinity of the second speaker portion 15 described above, and is configured not to be exposed to the outside of the first and second casings 2 and 3. The connecting means 5 is formed on the base end 2c side of the surface 2a of the first housing 2 and on the base end 3c side of the back surface 3e located on the back side of the front surface 3a of the second housing 3, respectively. Through-holes 31 and 33, a cylindrical connecting portion 35 protruding and fixed from the through-hole 31 of the first housing 2, and a rotatable engagement within the connecting portion 35, so that the second housing A rotating member 36 fixed to the body 3 and a connecting pin 37 penetrating the rotating member 36 and the connecting portion 35 in the second axis L2 direction are provided.
[0018]
Since the connecting means 5 is configured as described above, the second casing 3 is rotated around the first axis L1 with respect to the first casing 2, and the second casing 3 is The first casing 2 can be swung around the second axis L2.
[0019]
A method of using the mobile phone 1 configured as described above will be described.
When the mobile phone 1 is carried in a bag or a pocket of clothes, as shown in FIG. 1B, the two casings 2 and 3 are in a state of being closed to each other. The speaker portion 15 is exposed to the outside of the second housing 3.
In this state, for example, when a call is received by receiving an incoming signal, the incoming call is notified by sound generated from the first and second speaker units 13 and 15. At this time, the sound generated from the electroacoustic transducer 19 passes through the through holes 21 and 23, is reflected at the outer wall portion 17 b facing the through holes 21 and 23, and is reflected from the surface 3 a of the second housing 3. Propagate in the direction of separation.
[0020]
The operator of the mobile phone 1 recognizes the incoming call by this sound. Then, for example, as shown in FIG. 1A, the second casing 3 is rotated around the first axis L1 with respect to the first casing 2 so that the two casings 2 and 3 are mutually connected. And a call is started through the microphone unit 9 and the first speaker unit 13. Here, when the microphone unit 9 and the first speaker unit 13 are separated from the mouth and the ear, the second housing 3 is rotated around the second axis L2 with respect to the first housing 2. The relative position between the microphone section 9 and the first speaker section 13 can be adjusted by moving the microphone section 9 and the first speaker section 13.
[0021]
As described above, according to the structure of the second speaker portion 15, the through holes 21 and 23 for allowing sound to pass are formed in the inner wall portion 17 a of the recess 17 and open to the surface 3 a of the second housing 3. Therefore, it is possible to reduce the entry of foreign matter such as dust, dust, and liquid into the second housing 3 and to suppress damage to the electroacoustic transducer 19.
Further, the sound that has passed through the through holes 21 and 23 from the inside of the second housing 3 is reflected by the outer wall portion 17b of the concave portion 17 that is inclined so as to spread outward, and the surface of the second housing 3 Since it propagates in the direction away from 3a, the sound generated from the electroacoustic transducer 19 can be efficiently emitted to the outside of the second housing 3. Therefore, it is possible to prevent a reduction in sound quality.
[0022]
Furthermore, according to the mobile phone 1 provided with the second speaker unit 15, damage to the electroacoustic transducer 19 can be suppressed even when used outdoors with a large amount of foreign matter such as dust, dust, and liquid. 1 can be improved in reliability.
In addition, like the mobile phone 1 shown in FIG. 1, the second housing 3 is overlapped with the first housing 2, and the second housing 3 is placed on the surface 2 a of the first housing 2. In the structure that rotates substantially in parallel around one axis L1, the recess 17 formed in an annular shape is arranged in the vicinity of the connecting means 5, that is, in the vicinity of the first axis L1, so that the connecting means 5 Even if the first and second casings 2 and 3 are not exposed to the outside, the position of the connecting means 5 can be easily grasped using the portion surrounded by the recess 17 as an index. Moreover, since it is not necessary to expose the connection means 5 outside, a good appearance design can be formed.
[0023]
In the above embodiment, the structure that can reduce the intrusion of foreign matter is applied to the second speaker unit 15. However, the present invention is not limited to this, and a similar structure can be used, for example, the first speaker unit 13 or the like. You may apply to the microphone part 9. FIG.
For example, when applied to a microphone unit, the same effect is obtained that damage to a microphone (electroacoustic transducer) provided in the housing can be suppressed. Moreover, the sound from the outside of the second housing 3 is reflected on the side wall surface of the inclined recess and passes through the through hole, and reaches the microphone that converts the sound into an electric signal. Therefore, there is an effect that the sound from the outside can be collected efficiently.
[0024]
In addition, although the electroacoustic transducer 19 includes only a speaker, the present invention is not limited thereto, and may include only a microphone, or may include both a microphone and a speaker.
[0025]
Further, when the concave portion 17 is not used as an index of the connecting means 5, it is not necessary to arrange a speaker part or a microphone part having a structure capable of reducing intrusion of foreign matters in the vicinity of the connecting means 5, and the concave part 17 is formed in a ring There is also no need to form.
Further, the mobile phone 1 is not limited to the mobile phone 1, and any mobile terminal device may be used such as a PDA or a notebook computer in which two housings are connected to each other by a connecting means so as to be opened and closed. In addition, the mobile terminal device is not limited to having two housings, and may be configured from one housing, for example.
[0026]
Further, the speaker unit and the microphone unit having a structure that can reduce the intrusion of foreign matter may be applied not only to the mobile terminal device but also to various stationary electronic devices.
As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the intrusion of foreign matter into the housing, and thus it is possible to suppress damage to the electroacoustic transducer.
In addition, according to the present invention, the electroacoustic transducer structure can be applied to the receiver or transmitter.
[0028]
Further , according to the present invention, the sound can be efficiently propagated in and out of the housing by reflecting the sound on the inclined surface of the inclined recess, so that the sound quality can be prevented from deteriorating.
[0029]
Further , according to the present invention, since the electroacoustic transducer structure can be suppressed by providing the electroacoustic transducer structure in the portable terminal device such as a portable cellular phone or PDA, the reliability of the portable terminal device can be improved. Can be planned.
[0030]
In addition, according to the present invention, the position of the connecting means can be easily grasped using the electroacoustic transducer structure as an index, and it is not necessary to expose the connecting means to the outside, so that a good appearance design can be formed.
[Brief description of the drawings]
1A and 1B show a mobile phone according to an embodiment of the present invention, in which FIG. 1A is a plan view showing a state where first and second housings are opened to each other, and FIG. FIG. 1 is a plan view of a state where the first and second housings are closed to each other, and FIG. 5C is a side view of the state where the first and second housings are closed to each other.
2 is an enlarged perspective view showing a speaker unit in the mobile phone of FIG. 1. FIG.
3 is an enlarged cross-sectional view showing a speaker unit and connecting means in the mobile phone of FIG.
[Explanation of symbols]
1 Mobile phone (mobile terminal device)
2 1st housing | casing 3 2nd housing | casing 3a Front surface 3e Back surface (overlapping surface)
5 connection means 15 2nd speaker part (electroacoustic conversion part)
17 Concave portion 17a Inner wall portion 17b Outer wall portion 17c Bottom surface 17d, 17e Surface (side wall surface)
19 Electroacoustic transducers 21, 23 Through hole 24 Sound through hole L1 First axis (reference axis)

Claims (5)

A housing,
An electroacoustic transducer provided in the housing,
A recess having at least two side wall surfaces is formed on the surface of the housing,
A through hole is formed in one of the side wall surfaces, and an inclined surface is formed on the other side of the side wall surface so as to face the through hole and spread from the bottom surface of the recess toward the housing surface.
The electroacoustic transducer structure is characterized in that the electroacoustic transducer and the through hole communicate with each other . The electroacoustic transducer structure according to claim 1 , wherein one of the side wall surfaces is formed substantially perpendicular to the surface of the housing . The electroacoustic transducer structure according to claim 1 or 2, wherein the electroacoustic transducer is a speaker or a microphone .   A portable terminal device comprising the electroacoustic transducer structure according to any one of claims 1 to 3 in a casing. The casing is composed of two casings that can be overlapped with each other,
A connecting means for connecting these two cases to each other so as to be rotatable around a reference axis along the overlapping direction;
The electroacoustic transducer structure is disposed on the surface side opposite to the overlapping surface facing when the two casings are overlapped, and is disposed in the vicinity of the reference axis, and the recess is formed in an annular shape. The mobile terminal device according to claim 4, wherein the mobile terminal device is a mobile terminal device.

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