JP2012034120A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop radiation of sound for a short time.SOLUTION: The portable terminal device includes a first and a second housings 1, 2 that are connected to be slidable, a first speaker 11 disposed in the first housing 1 and a first sound emitting hole 21 for radiating acoustic waves emitted by the first speaker 11 to the outside of the first housing 1. The portable terminal device further includes a second speaker 12 disposed in the second housing 2 and a second sound emitting hole 22 for radiating acoustic waves emitted by the second speaker 12 to the outside of the second housing 2. When a physical relationship due to slide is in a first state, the first sound emitting hole 21 and the second sound emitting hole 22 is opened. When the physical relationship is in a second state, the second housing 2 blocks the first sound emitting hole 21 but the first housing 1 does not block the second sound emitting hole 22. When the physical relationship is in a third state, the second housing 2 blocks the first sound emitting hole 21 and the first housing 1 blocks the second sound emitting hole 22.

Description

  The present invention relates to a mobile terminal device.

  In recent years, demand for mobile terminal devices such as mobile phones and laptop computers has been increasing. In particular, development of a thin portable terminal device having a commercial value of a sound function such as a videophone, a moving image reproduction, and a hands-free telephone function is being promoted (for example, Patent Documents 1 to 4).

JP 2003-219005 A JP 2005-328284 A JP 2006-067084 A JP 2006-157199 A

  By the way, in order to stop the sound emission from the mobile terminal device, it is common to perform an operation for stopping the sound output, but in order to stop the sound output by the control according to this operation, to some extent Takes time. For this reason, development of the portable terminal device which can stop radiation | emission of a sound for a shorter time is desired.

  An object of the present invention is to provide a portable terminal device that can stop sound emission in a short time.

According to the present invention, first and second housings slidably connected to each other;
A first speaker provided in the first housing;
A first sound emitting hole formed in the first casing and radiating a sound wave emitted from the first speaker to the outside of the first casing;
A second speaker provided in the second housing;
A second sound emitting hole formed in the second casing and radiating sound waves emitted from the second speaker to the outside of the second casing;
Have
When the relative positional relationship between the first and second casings by the slide is in the first state, the second casing does not block the first sound emitting hole, and the first casing The body does not block the second sound emitting hole,
When the positional relationship is in the second state, the second housing closes the first sound emitting hole, and the first housing does not close the second sound emitting hole.
When the positional relationship is in the third state, the second housing closes the first sound emitting hole, and the first housing closes the second sound emitting hole. A portable terminal device is provided.

  According to the present invention, sound emission can be stopped in a short time.

It is a typical sectional side view of the portable terminal device which concerns on 1st Embodiment. It is a schematic diagram of the speaker with which the portable terminal device which concerns on 1st Embodiment is provided. It is sectional drawing which shows the layer structure of a vibrator | oscillator. It is an expanded sectional view of a housing. It is a typical sectional side view of the portable terminal device which concerns on 2nd Embodiment. It is a disassembled perspective view which shows the structure of the MEMS actuator used as a vibrator | oscillator of the speaker with which the portable terminal device which concerns on 3rd Embodiment is provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a schematic sectional side view of a mobile terminal device according to the first embodiment. 1A shows the first state, FIG. 1B shows the second state, and FIG. 1C shows the third state.

  The mobile terminal device according to the first embodiment includes first and second housings 1 and 2 that are slidably connected to each other, a first speaker 11 provided in the first housing 1, A first sound emitting hole 21 that is formed in the first housing 1 and radiates a sound wave emitted from the first speaker 11 to the outside of the first housing 1, and a first sound emitting hole 21 provided in the second housing 2. 2 speakers 12 and a second sound emitting hole 22 that is formed in the second housing 2 and radiates sound waves emitted from the second speaker 12 to the outside of the second housing 2. And when the relative positional relationship of the 1st and 2nd housing | casing 1 and 2 by a slide is a 1st state, while the 2nd housing | casing 2 does not block | close the 1st sound emission hole 21, The casing 1 does not block the second sound emitting hole 22. When the positional relationship by the slide is in the second state, the second housing 2 blocks the first sound emitting hole 21 and the first housing 1 does not block the second sound emitting hole 22. Become. Further, when the positional relationship by the slide is in the third state, the second housing 2 closes the first sound emitting hole 21 and the first housing 1 closes the second sound emitting hole 22. The mobile terminal device is, for example, a mobile phone, a PDA (Personal Digital Assistant), a small game device, a laptop personal computer, or the like. Details will be described below.

  The first and second housings 1 and 2 are each formed in, for example, a flat rectangular parallelepiped shape. The first and second housings 1 and 2 are connected to each other so as to be slidable by a slide mechanism (not shown).

  The first and second casings 1 and 2 slide in a direction in which the total length of the mobile terminal device including the first and second casings 1 and 2 extends and contracts (in the direction of arrow A in FIG. 1). Move linearly relative to each other. 1A shows a state in which the entire length of the mobile terminal device is extended most (first state), FIG. 1C shows a state in which the total length of the mobile terminal device is contracted most (third state), and FIG. ) Is an intermediate state (second state) when the entire length of the mobile terminal device is as shown in FIG. 1 (a) and FIG. 1 (c).

  In the first state, the first and second housings 1 and 2 partially overlap each other. In the second state, the first and second casings 1 and 2 overlap each other over a wider range than in the first state. In the third state, the first and second casings 1 and 2 overlap each other over a wider range than in the second state. Specifically, for example, in the third state, the first and second housings 1 and 2 are almost completely overlapped.

  A first speaker 11 is provided in the first housing 1. In the first housing 1, a first sound emitting hole 21 that radiates a sound wave emitted from the first speaker 11 to the outside of the first housing 1 is formed at a position corresponding to the first speaker 11. .

  A second speaker 12 is provided in the second housing 2. In the second housing 2, a second sound emission hole 22 that radiates sound waves emitted from the second speaker 12 to the outside of the second housing 2 is formed at a position corresponding to the second speaker 12. .

The surface of the first housing 1 in which the first sound emitting hole 21 is formed and the surface of the second housing 2 in which the second sound emitting hole 22 is formed are opposed to each other, and the first And second housings 1 and 2
Slide on each other along these planes.

  Here, as shown in FIG. 1A, in the first state, the second housing 2 does not block the first sound emitting hole 21, and the first housing 1 also performs the second sound emitting. The hole 22 is not blocked, and the first and second sound emitting holes 21 and 22 are opened. Therefore, the sound wave emitted from the first speaker 11 is radiated in the direction of arrow B through the first sound emission hole 21. On the other hand, the sound wave emitted from the second speaker 12 is radiated in the direction of arrow C through the second sound emitting hole 22. Note that the direction of arrow C is opposite to the direction of arrow B.

  In addition, as shown in FIG. 1B, in the second state, the second housing 2 closes the first sound emitting hole 21 and the first housing 1 covers the second sound emitting hole 22. The second sound emitting hole 22 is opened without being closed. Therefore, the sound wave emitted from the first speaker 11 is shielded by the second casing 2 and is not radiated to the outside of the mobile terminal device. On the other hand, the sound wave emitted from the second speaker 12 is radiated in the direction of arrow C through the second sound emitting hole 22.

  Further, as shown in FIG. 1C, in the third state, the second casing 2 closes the first sound emitting hole 21, and the first casing 1 also has the second sound emitting hole 22. It will be in a closed state. Therefore, the sound wave emitted from the first speaker 11 is shielded by the second casing 2 and is not radiated to the outside of the mobile terminal device. On the other hand, since the sound wave emitted from the second speaker 12 is also shielded by the first housing 1, it is not radiated to the outside of the mobile terminal device.

Here, as shown in FIG. 1B, a first sound absorbing material 31 is provided in a portion of the second housing 2 that faces the first sound emitting hole 21 in the second state. Thereby, the sound leakage of the sound from the first speaker 11 in the second state can be more reliably suppressed.
Similarly, as shown in FIG. 1C, a second sound absorbing material 32 is provided in a portion of the first housing 1 that faces the second sound emitting hole 22 when in the third state, A third sound absorbing material 33 is provided at a portion of the housing 2 facing the first sound emitting hole 21 in the third state. Thereby, the sound leakage of the sound from the first speaker 11 and the sound leakage of the sound from the second speaker 12 in the third state can be more reliably suppressed.
Note that the first to third sound absorbing materials 31 to 33 are made of a porous material such as urethane, for example.

  At least one of the first and second housings 1 and 2 can be provided with a display device such as a liquid crystal display device. In the example of FIG. 1, the first liquid crystal display device 41 is provided on the surface of the first housing 1 facing away from the second housing 2. A second liquid crystal display device 42 is provided on the surface facing the opposite side of the housing 1.

  Further, at least one of the first and second casings 1 and 2 (for example, the first casing 1) can be provided with an operation unit (not shown) including, for example, operation keys and the like. . For example, the operation unit may be provided on a surface opposite to the surface on which the first liquid crystal display device 41 is provided. Furthermore, at least one of the first and second casings 1 and 2 (for example, both casings 1 and 2) can be provided with a circuit board. The first and second speakers 11 and 12 are also preferably provided on the circuit board.

  In addition, the mobile terminal device has, for example, a music playback function or a TV viewing function, and the music playback or TV viewing in the first state (FIG. 1A) and the second state (FIG. 1B). Is possible. Image display such as TV is performed in parallel on each of the first and second liquid crystal display devices 41 and 42, and sound such as TV is output from each of the first and second speakers 11 and 12. It has come to be.

In this case, in a 1st state, a 1st user is located in the front (arrow C direction) of the 1st liquid crystal display device 41, and a 2nd user is the front (arrow B direction) of the 2nd liquid crystal display device 42. ), The first user can listen to the sound output from the second speaker 12 in the direction of arrow C while viewing the image on the first liquid crystal display device 41, and can also use the second user. The person can hear the sound output from the first speaker 11 in the direction of arrow B while viewing the image on the second liquid crystal display device 42.
Here, if the second user or a third person existing in the direction of the arrow B does not want to hear the voice, the first user slides the portable terminal device to the second state or the second With the state 3, the sound wave output from the first speaker 11 can be instantaneously shielded by the second housing 2 and the sound emission in the arrow B direction can be stopped.
In the second state, the first user listens to the sound output in the direction of arrow C from the second speaker 12 while viewing the image on the first liquid crystal display device 41, as in the first state. be able to.

  In this way, the sound emission from the mobile terminal device can be stopped in a very short time by simply sliding the mobile terminal device.

  FIG. 2 is a schematic diagram of the first and second speakers 11 and 12.

  The first and second speakers 11 and 12 include, for example, a sheet-like vibration member 30, a vibrator 20, a support member 40, a signal generation unit 54, and a control unit 50. The vibrator 20 is a piezoelectric vibrator, for example, and is attached to one surface of the vibration member 30. The support member 40 supports the edge of the vibration member 30. The signal generation unit 54 and the control unit 50 constitute an oscillation circuit (input unit) that oscillates the transducer 20 by inputting an oscillation signal to the transducer 20 and oscillates a sound wave from the transducer 20 and the vibrating member 30. ing.

  The vibration member 30 vibrates due to vibration generated from the vibrator 20, and oscillates a sound wave having a frequency of 20 kHz or more, for example. The vibrator 20 also oscillates, for example, a sound wave having a frequency of 20 kHz or more when vibrated. The vibrating member 30 adjusts the basic resonance frequency of the vibrator 20. The fundamental resonance frequency of the mechanical vibrator depends on the load weight and compliance. Since the compliance is the mechanical rigidity of the vibrator, the basic resonance frequency of the vibrator 20 can be controlled by controlling the rigidity of the vibration member 30. The thickness of the vibration member 30 is preferably 5 μm or more and 500 μm or less. In addition, the vibration member 30 preferably has a longitudinal elastic modulus, which is an index indicating rigidity, of 1 Gpa or more and 500 GPa or less. When the rigidity of the vibration member 30 is too low or too high, there is a possibility that the characteristics and reliability of the mechanical vibrator are impaired. The material constituting the vibration member 30 is not particularly limited as long as it is a material having a high elastic modulus with respect to the vibrator 20 that is a brittle material, such as metal or resin, but phosphor bronze or the like from the viewpoint of workability and cost. Stainless steel or the like is preferable.

  In the present embodiment, the planar shape of the vibrator 20 is a circle. However, the planar shape of the vibrator 20 is not limited to a circle. The entire surface of the vibrator 20 facing the vibration member 30 is fixed to the vibration member 30 with an adhesive. Thereby, the entire surface of one surface of the vibrator 20 is restrained by the vibration member 30.

  The signal generation unit 54 generates an electrical signal input to the vibrator 20, for example, a modulation signal in a parametric speaker. The transport wave of the modulation signal is, for example, an ultrasonic wave having a frequency of 20 kHz or higher, and specifically, an ultrasonic wave having a frequency of 100 kHz, for example. The control unit 50 controls the signal generation unit 54 in accordance with an audio signal input from the outside.

  FIG. 3 is a cross-sectional view showing the layer structure of the vibrator 20 in the thickness direction. The vibrator 20 includes a piezoelectric body 23, an upper surface electrode 24, and a lower surface electrode 26.

The piezoelectric body 23 is polarized in the thickness direction. The material constituting the piezoelectric body 23 may be either an inorganic material or an organic material as long as it has a piezoelectric effect. However, a material having high electromechanical conversion efficiency such as zirconate titanate (PZT) or barium titanate (BaTiO ₃ ) is preferable. The thickness h1 of the piezoelectric body 23 is, for example, not less than 10 μm and not more than 1 mm. When the thickness h1 is less than 10 μm, there is a possibility that the vibrator 20 may be damaged during manufacture of the speaker. On the other hand, if the thickness h1 is more than 1 mm, the electromechanical conversion efficiency becomes too low, and there is a possibility that a sufficiently large vibration cannot be obtained. The reason is that as the thickness of the vibrator 20 increases, the electric field strength in the piezoelectric vibrator decreases in inverse proportion.

  Although the material which comprises the upper surface electrode 24 and the lower surface electrode 26 is not specifically limited, For example, silver and silver / palladium can be used. Since silver is used as a general-purpose electrode material with low resistance, it has advantages in manufacturing process and cost. Since silver / palladium is a low-resistance material excellent in oxidation resistance, there is an advantage from the viewpoint of reliability. The thickness h2 of the upper surface electrode 24 and the lower surface electrode 26 is not particularly limited, but the thickness h2 is preferably 1 μm or more and 50 μm or less. When the thickness h2 is less than 1 μm, it is difficult to uniformly mold the upper surface electrode 24 and the lower surface electrode 26, and as a result, the electromechanical conversion efficiency may be reduced. Moreover, when the film thickness of the upper surface electrode 24 and the lower surface electrode 26 exceeds 100 micrometers, the upper surface electrode 24 and the lower surface electrode 26 become a restraint surface with respect to the piezoelectric material 23, and there exists a possibility that energy conversion efficiency may fall.

  The vibrator 20 can have an outer diameter = φ18 mm, an inner diameter = φ12 mm, and a thickness = 100 μm. Further, as the upper surface electrode 24 and the lower surface electrode 26, for example, a silver / palladium alloy having a thickness of 8 μm (weight ratio is, for example, 7: 3) can be used. The vibrating member 30 may be made of phosphor bronze having an outer diameter = φ20 mm and a thickness = 50 μm (0.3 mm). The support member 40 functions as a case of the first speaker 11 and is formed in a cylindrical shape (for example, a cylindrical shape) having an outer diameter = φ22 mm and an inner diameter = φ20 mm, for example.

  Here, a case where the first and second speakers 11 and 12 are parametric speakers will be described. A parametric speaker emits ultrasonic waves (transport waves) subjected to AM modulation, DSB modulation, SSB modulation, and FM modulation from each of a plurality of oscillation sources into the air, and due to nonlinear characteristics when the ultrasonic waves propagate into the air , To make an audible sound appear. Non-linear here means that the flow changes from laminar flow to turbulent flow when the Reynolds number indicated by the ratio between the inertial action and the viscous action of the flow increases. Since the sound wave is slightly disturbed in the fluid, the sound wave propagates nonlinearly. In particular, in the ultrasonic frequency band, the nonlinearity of sound waves can be easily observed. And when an ultrasonic wave is radiated in the air, harmonics accompanying the nonlinearity of the sound wave are remarkably generated. The sound wave is a dense state where the density of the molecular density is generated in the air. When it takes time for air molecules to recover from compression, air that cannot be recovered after compression collides with air molecules that continuously propagate, and a shock wave is generated. An audible sound is generated by the shock wave, that is, the audible sound is reproduced (demodulated). Parametric loudspeakers have the advantage of high sound directivity and high sound straightness.

Since the sound wave output from the parametric speaker has high straightness, attenuation of the sound wave caused by entering the inner circumferences of the first and second sound emission holes 21 and 22 can be suppressed. For this reason, compared with the case where the general speaker which outputs an audible sound is used, the diameter of the 1st and 2nd sound emission holes 21 and 22 can be made small significantly. FIG. 1 shows an example in which each of the first and second sound emitting holes 21 and 22 is one, but the number of the first and second sound emitting holes 21 and 22 may be plural. good.
By dividing the first sound emitting hole 21 into a plurality of parts, the opening area of each first sound emitting hole 21 can be reduced, and the waterproofness can be improved. The same applies to the second sound emission hole 22.

Here, in the case of using a general speaker that outputs audible sound, the sound emitting hole formed in the housing needs a total area of, for example, about 10 mm ² . That is, when the number of sound emitting holes corresponding to one speaker is 10, the area of each sound emitting hole needs to be about 1 mm ^{2 on} average. The larger the area of the sound emission holes and the greater the number of sound emission holes, the higher the possibility that water will enter the housing through the sound emission holes (that is, the waterproof performance is inferior).
On the other hand, when a parametric speaker is used, the total area of the first sound emission holes 21 is, for example, 3 mm ² or less (specifically, about 1 mm ² ). The same applies to the second sound emission hole 22.
Further, the number of the first sound emission holes 21 (the number of the sound emission holes 22) may be five or less, for example. For this reason, compared with the case where a general speaker is used, it becomes possible to improve waterproof performance dramatically.
In the case of a general speaker, the total area of the sound emission holes needs to be about 1/20 of the area of the speaker, whereas in the case of a parametric speaker, the total area of the first sound emission holes 21 (second The total area of the sound emission holes 22) is about 1/50 of the area of the parametric speaker. This is because, as described above, the sound wave output from the parametric speaker has high straightness.

  Next, an example of a more specific configuration inside the first housing 1 will be described. FIG. 4 is a schematic enlarged cross-sectional view of the first housing 1. As shown in FIG. 4, a circuit board 6 and various component parts 7 mounted on the circuit board 6 are provided in the first housing 1. The first speaker 11 is also mounted on the circuit board 6. The component 7 is, for example, an electronic component such as a discrete component or a semiconductor package. Here, a sound passage hole 8 is formed in the circuit board 6 so as not to prevent the sound wave output from the first speaker 11 from reaching the first sound emission hole 21. The same applies to the internal structure of the second housing 2.

  According to the first embodiment as described above, sound emission in a specific direction can be blocked in a short time by sliding the mobile terminal device.

[Second Embodiment]
FIG. 5 is a schematic side sectional view of a mobile terminal device according to the second embodiment. The mobile terminal device according to the present embodiment is different from the mobile terminal device according to the first embodiment only in that the second liquid crystal display device 42 is not provided, and otherwise the mobile terminal device according to the first embodiment. It is comprised similarly to a terminal device. In this case, the same effect as that of the first embodiment can be obtained.
[Third Embodiment]
The first and second speakers 11 and 12 of the mobile terminal device according to the present embodiment have a micro electro mechanical systems (MEMS) actuator 70 shown in FIG. In other respects, the mobile terminal device according to the present embodiment is configured in the same manner as the mobile terminal device according to the first or second embodiment.

  In the example shown in FIG. 6, the driving method of the MEMS actuator 70 is a piezoelectric method, and has a structure in which a piezoelectric thin film layer 72 is sandwiched between an upper movable electrode layer 74 and a lower movable electrode layer 76. The MEMS actuator 70 operates when a signal is input from the signal generation unit 54 to the upper movable electrode layer 74 and the lower movable electrode layer 76. For example, an aerosol deposition method is used for manufacturing the MEMS actuator 70, but the method is not limited to this method. However, it is preferable to use the aerosol deposition method because the piezoelectric thin film layer 72, the upper movable electrode layer 74, and the lower movable electrode layer 76 can be formed on curved surfaces. The driving method of the MEMS actuator 70 may be an electrostatic method, an electromagnetic method, or a heat conduction method.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

  In the above description, the example in which the sliding movement of the first and second casings 1 and 2 is a linear movement has been described. However, the first and second casings 1 and 2 may be configured to slide in a curved shape.

DESCRIPTION OF SYMBOLS 1 1st housing | casing 2 2nd housing | casing 6 Circuit board 7 Component 8 Sound passage hole 11 First speaker 12 Second speaker 20 Vibrator 21 First sound emitting hole 22 Second sound emitting hole 23 Piezoelectric body 24 Upper surface Electrode 26 Lower surface electrode 30 Vibration member 31 First sound absorbing material 32 Second sound absorbing material 33 Third sound absorbing material 40 Support member 41 First liquid crystal display device 42 Second liquid crystal display device 50 Controller 54 Signal generator 70 Actuator 72 Piezoelectric thin film layer 74 Upper movable electrode layer 76 Lower movable electrode layer

Claims (8)

First and second housings slidably connected to each other;
A first speaker provided in the first housing;
A first sound emitting hole formed in the first casing and radiating a sound wave emitted from the first speaker to the outside of the first casing;
A second speaker provided in the second housing;
A second sound emitting hole formed in the second casing and radiating sound waves emitted from the second speaker to the outside of the second casing;
Have
When the relative positional relationship between the first and second casings by the slide is in the first state, the second casing does not block the first sound emitting hole, and the first casing The body does not block the second sound emitting hole,
When the positional relationship is in the second state, the second housing closes the first sound emitting hole, and the first housing does not close the second sound emitting hole.
When the positional relationship is in the third state, the second housing closes the first sound emitting hole, and the first housing closes the second sound emitting hole. Mobile terminal device. A portion of the second housing that faces the first sound emitting hole when in the second state;
A portion of the first casing that faces the second sound emitting hole when in the third state;
A portion of the second casing that faces the first sound emitting hole when in the third state;
The mobile terminal device according to claim 1, wherein a sound absorbing material is provided in at least one of the devices.   The width of the range in which the first and second casings overlap each other is wider in the second state than in the first state, and in the third state than in the second state. The portable terminal device according to claim 1, wherein the time is wider.   The said 1st and 2nd housing | casing is mutually linearly moved to the direction where the full length which match | combined the said 1st and 2nd housing | casing extends and shrinks by the said slide. The portable terminal device as described in any one. The speaker is
A sheet-like vibrating member;
A vibrator attached to one surface of the vibrating member;
A support portion for supporting an edge of the vibration member;
An input unit that vibrates the vibrator by inputting an oscillation signal to the vibrator and oscillates a sound wave from the vibrator and the vibrating member;
5. The mobile terminal device according to claim 1, comprising:   6. The mobile terminal device according to claim 5, wherein the input unit oscillates the vibrator at a frequency of 20 kHz or more to oscillate a sound wave having a frequency of 20 kHz or more from the vibrator and the vibration member. .   The portable terminal device according to claim 5, wherein the vibrator is a piezoelectric vibrator.   The portable terminal device according to claim 5, wherein the vibrator is MEMS (Micro Electro Mechanical Systems).

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