JP2012034124A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain reduction in strength of a case body and suppress deterioration in processability and cost increase of the case body when providing a waveguide for emitting a sound wave in each of a plurality of slide states of a sliding type portable terminal device.SOLUTION: A portable terminal device has: first and second slidable case bodies 1 and 2; a parametric speaker 60 provided inside the first case body 1; first and second waveguides 31 and 32 formed in the second case body 2; and an emission sound hole 4 formed in the first case body 1. The first waveguide 31 leads a sound wave given out from the speaker 60 and emits the sound wave outside when a slid position is in a first state. The second waveguide 32 leads the sound wave and emits it outside when the slid position is in a second state. The first waveguide 31 is configured to form a first groove on a surface of the second case body 2 opposing to the first case body 1.

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, the development of thin portable terminal devices that have commercial functions such as videophones, video playback, and hands-free telephone functions is underway.

  Patent Document 1 discloses that first and second housings slidably connected to each other, a speaker provided in any housing, and a waveguide provided in any housing (the same literature). There is described a slide type portable terminal that emits sound in a direction different from that during sliding through a waveguide when the second housing is housed.

  Patent Document 2 describes a speaker having a sound source formed by an ultrasonic speaker and a rotatable reflector provided to deflect a highly directional sound generated by the sound source. Yes.

JP 2006-157199 A JP-T 2006-511128

By the way, when using a general speaker that outputs audible sound, the diameter of the waveguide needs to be about 0.7 mm, for example. On the other hand, since the portable terminal device is required to be small and light, the thickness of the casing is, for example, about 1 to 2 mm.
Therefore, if a waveguide is to be formed by forming a groove on the surface of the housing, the ratio of the depth of the groove 1001 to the thickness T of the housing 1000 is, for example, as shown in FIG. It gets bigger. Thereby, the intensity | strength of the housing | casing 1000 will fall significantly in the formation location of the groove | channel 1001. FIG.
For this reason, for example, as shown in FIG. 16B, it is preferable to process the housing 1000 into a shape in which the thickness T does not change even at the location where the groove 1001 is formed.

  However, machining the housing 1000 into a complicated shape as shown in FIG. 16B not only complicates the machining process, that is, deteriorates the workability, but also increases the cost of the housing 1000.

  An object of the present invention is to suppress a decrease in strength of a housing when a waveguide for emitting sound waves in each of a plurality of sliding states of a slide-type mobile terminal device is provided by forming a groove in the housing. However, an object of the present invention is to provide a portable terminal device that can suppress deterioration of workability of the casing and increase in cost.

According to the present invention, first and second housings slidably connected to each other;
A parametric speaker provided in the first housing;
First and second waveguides formed in the second housing;
A sound emitting hole formed in the first housing and radiating a sound wave emitted from the parametric speaker to the outside of the first housing;
Have
The first waveguide communicates with the sound emitting hole and guides sound waves emitted from the parametric speaker when the relative positional relationship between the first and second housings by the slide is in the first state. Radiate to the outside,
When the positional relationship by the slide is in the second state, the second waveguide communicates with the sound emitting hole, guides the sound wave, and radiates to the outside.
The first waveguide is configured by forming a first groove on a surface of the second casing that faces the first casing, and a portable terminal device is provided. .

  ADVANTAGE OF THE INVENTION According to this invention, when providing the waveguide for radiating | emitting a sound wave in each of several sliding states of a slide type portable terminal device, the deterioration of the workability of a housing | casing is suppressed, suppressing the fall of the intensity | strength of a housing | casing. In addition, an increase in cost can be suppressed.

It is a schematic diagram which shows the 1st state of the portable terminal device which concerns on 1st Embodiment. It is a schematic diagram which shows the 2nd state of the portable terminal device which concerns on 1st Embodiment. It is a schematic diagram of the parametric 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 expanded sectional view showing the 1st state of the personal digital assistant device concerning a 1st embodiment. It is a schematic diagram which shows the 1st state of the portable terminal device which concerns on 2nd Embodiment. It is a schematic diagram which shows the 2nd state of the portable terminal device which concerns on 2nd Embodiment. It is a schematic diagram which shows the 2nd state of the portable terminal device which concerns on 3rd Embodiment. It is a schematic diagram which shows the 1st state of the portable terminal device which concerns on 3rd Embodiment. It is a typical expanded sectional view which shows the 2nd state of the portable terminal device which concerns on 3rd Embodiment. It is a schematic diagram which shows the 3rd state of the portable terminal device which concerns on 4th Embodiment. It is a schematic diagram which shows the 1st state of the portable terminal device which concerns on 4th Embodiment. It is a schematic diagram which shows the 2nd state of the portable terminal device which concerns on 4th Embodiment. It is a disassembled perspective view which shows the structure of the MEMS actuator used as a vibrator | oscillator of the parametric speaker with which the portable terminal device which concerns on 4th Embodiment is provided. It is sectional drawing of the housing | casing for demonstrating a subject.

  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]
1 and 2 are schematic diagrams of the mobile terminal device according to the first embodiment. Of these, FIG. 1 shows a state in which the first and second casings 1 and 2 are slid so that the portable terminal device is deployed, and FIG. A state where the casings 1 and 2 are slid is shown. In the present embodiment, the state of FIG. 1 is the first state, and the state of FIG. 2 is the second state. 1A and 2A are plan views, and FIG. 1B and FIG. 2B are cross-sectional views.

  The mobile terminal device according to the first embodiment includes first and second casings 1 and 2 slidably connected to each other, a parametric speaker 60 provided in the first casing 1, The first and second waveguides 31 and 32 formed in the second casing 2 and the sound waves emitted from the parametric speaker 60 and radiated to the outside of the first casing 1 are emitted from the first casing 1. And a sound emitting hole 4. The first waveguide 31 communicates with the sound emission hole 4 when the relative positional relationship between the first and second casings 1 and 2 by the slide is in the first state (FIG. 1), and is connected to the parametric speaker 60. The emitted sound wave is guided and radiated to the outside. When the positional relationship by the slide is in the second state (FIG. 2), the second waveguide 32 communicates with the sound emission hole 4 to guide and emit sound waves to the outside. The first waveguide 31 is configured by forming a first groove on a surface of the second casing 2 that faces the first casing 1. 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 are slid to extend in the direction in which the entire length of the mobile terminal device including the first and second casings 1 and 2 extends and in the direction in which the portable terminal apparatus contracts (arrow A in FIGS. Direction). That is, FIG. 1 shows a state where the entire length of the mobile terminal device is extended, and FIG. 2 shows a state where the overall length of the mobile terminal device is reduced.

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

  A parametric speaker 60 is provided in the first housing 1. The parametric speaker 60 oscillates ultrasonic waves. Sound can be reproduced by demodulating the ultrasonic waves.

  In the first housing 1, a sound emitting hole 4 that radiates a sound wave emitted from the parametric speaker 60 to the outside of the first housing 1 is formed at a position facing the speaker 60. The sound emission hole 4 faces the second casing 2 in both the first state and the second state.

  The second housing 2 is formed with first and second waveguides 31 and 32. In the case of this embodiment, each of the first and second waveguides 31 and 32 is configured by forming a groove on the surface of the second casing 2 that faces the first casing 1.

For example, the first waveguide 31 extends in a direction orthogonal to the sliding direction (arrow A direction) in a plane parallel to the mutually opposing surfaces of the first and second casings 1 and 2. is doing. More specifically, the first waveguide 31 is formed between both side surfaces of the second housing 2 in this direction, for example.
The first waveguide 31 is formed at a position facing the sound emitting hole 4 and communicating with the sound emitting hole 4 in the first state (FIG. 1). In this state, the first waveguide 31 is covered by the first casing 1 except for the portion where the sound emitting hole 4 is formed, and between the first waveguide 31 and the first casing 1. Sound waves can be guided through the space.
Therefore, in the first state, the sound wave emitted from the parametric speaker 60 enters the first waveguide 31 through the sound emission hole 4 and is guided by the first waveguide 31 in the first direction ( Radiating to the outside of the mobile terminal device in the directions of arrows B and C in FIG.
That is, the first waveguide 31 radiates sound waves from the side surface of the second housing 2 in a direction that intersects the direction of linear movement by sliding. More specifically, the first waveguide 31 emits sound waves from both side surfaces of the second housing 2 in a direction orthogonal to the direction of linear movement by sliding.

On the other hand, the second waveguide 32 extends in the direction of linear movement by sliding (in the direction of arrow A). More specifically, the second waveguide 32 has one end reaching the end surface 2a of the second housing 2 in the sliding direction.
The second waveguide 32 is formed so that the other end of the second waveguide 32 faces the sound emitting hole 4 and communicates with the sound emitting hole 4 in the second state (FIG. 2). Has been. In this state, the second waveguide 32 is covered by the first casing 1 except for the portion where the sound emission hole 4 is formed, and between the second waveguide 32 and the first casing 1. Sound waves can be guided through the space.
For this reason, in the second state, the sound wave emitted from the parametric speaker 60 enters the second waveguide 32 through the sound emission hole 4 and is guided by the second waveguide 32 in the first direction. Radiates to the outside of the mobile terminal device in different second directions (for example, in the direction of arrow D in FIG. 2).
That is, the second waveguide 32 radiates sound waves from the end surface 2a of the second housing 2 in the direction of linear movement by sliding.

  As shown in FIGS. 1 and 2, in the case of the present embodiment, the direction in which sound waves are emitted from the first waveguide 31 in the first state (arrow B direction and C direction) and the second state in the second state. The direction in which sound waves are radiated from the waveguide 32 (arrow D direction) is 90 ° different from each other.

  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 FIGS. 1 and 2, for example, the liquid crystal display device 5 is provided on the surface of the second housing 2 that faces away from the first 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. . 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 (described later).

For example, the mobile terminal device has a communication function, and when an incoming call (call incoming call, mail incoming call, etc.) occurs, the mobile terminal device notifies the fact by a sound from the parametric speaker 60 (so-called ringtone). .
For example, when the mobile terminal device is placed in the breast pocket with the end face 2a facing upward in the second state in which the total length of the mobile terminal device is reduced as shown in FIG. A ring tone is emitted in the D direction. That is, a ring tone is emitted toward the user's face. For this reason, the user can easily notice the ring tone.

  For example, one of the first and second casings 1 and 2 (for example, the first casing 1) is a so-called microphone-side casing, and is transmitted to the other party during a call or the like. Has a microphone (transmission unit) (not shown). The other of the first and second casings 1 and 2 (for example, the second casing 2) is a so-called receiver-side casing. The receiver-side housing has a speaker (receiver) (not shown) different from the parametric speaker 60 in order to output the sound received from the other party during a call.

  In addition, the mobile terminal device has, for example, a TV viewing function and the like and can watch TV in the first state shown in FIG. Sound such as TV is output from the parametric speaker 60. For this reason, sound can be radiated in the arrow B direction and the C direction when watching TV.

  In this manner, the sound emission direction from the second housing 2 can be switched in conjunction with the sliding operation of the first and second housings 1 and 2.

  FIG. 3 is a schematic diagram of the parametric speaker 60.

  The parametric speaker 60 includes, 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 electric signal input to the vibrator 20, that is, 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. 4 is a cross-sectional view showing the layer structure of the vibrator 20 in the thickness direction. The vibrator 20 includes a piezoelectric body 22, an upper surface electrode 24, and a lower surface electrode 26.

The piezoelectric body 22 is polarized in the thickness direction. The material constituting the piezoelectric body 22 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 22 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 μm, the upper surface electrode 24 and the lower surface electrode 26 serve as constraining surfaces with respect to the piezoelectric body 22, and there is a possibility that energy conversion efficiency is reduced.

  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 parametric speaker 60, and is formed in a cylindrical shape (for example, a cylindrical shape) with an outer diameter = φ22 mm and an inner diameter = φ20 mm, for example.

  Here, the parametric speaker 60 emits an ultrasonic wave (transport wave) subjected to AM modulation, DSB modulation, SSB modulation, and FM modulation from each of a plurality of oscillation sources into the air, and the ultrasonic wave propagates into the air. Due to the non-linear characteristics, audible sound appears. 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). The parametric speaker 60 has the advantage that the directivity of sound is high and has the property that the straightness of sound is high.

Since the sound wave output from the parametric speaker 60 has high straightness, attenuation of the sound wave caused by entering the waveguide can be suppressed. For this reason, compared with the case where the general speaker which outputs an audible sound is used, the diameter of a waveguide can be reduced significantly.
The diameter (depth and width) of the grooves constituting the first waveguide 31 can be set to, for example, 0.3 mm or less, and more specifically, for example, about 0.1 mm. . The same applies to the depth and width of the grooves constituting the second waveguide 32.

  For the same reason, the diameter of the sound emitting hole 4 can also be reduced. 1 and 2 show one example of the sound emission holes 4, the number of sound emission holes 4 may be plural. By dividing the sound emitting hole 4 into a plurality of parts, the opening area of each sound emitting hole 4 can be reduced, and the waterproofness can be improved.

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 the parametric speaker 60 is used, the total area of the sound emission holes 4 is, for example, 3 mm ² or less (specifically, about 1 mm ² ). Further, the number of sound emitting holes is sufficient, for example, 5 or less. 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 the parametric speaker 60, the total area of the sound emission holes 4 is equal to the parametric speaker. About 1/50 of the area of 60 is sufficient. This is because, as described above, the sound wave output from the parametric speaker 60 has high straightness.

FIG. 5 is an enlarged cross-sectional view of the second housing 2.
As described above, since the portable terminal device is required to be small and lightweight, the thickness of the casing (the first and second casings 1 and 2) is, for example, 1 mm or more and 2 mm or less. is there.
As described above, the diameter (depth and width) of the waveguides (first waveguide 31 and second waveguide 32) for guiding the sound wave output from the parametric speaker 60 is 0.3 mm or less (specifically, Is about 0.1 mm). Therefore, for example, as shown in FIG. 5, the diameter of the waveguide can be made sufficiently smaller than the wall thickness T of the second housing 2. Therefore, sufficient strength of the second housing 2 can be ensured without processing the second housing 2 into a complicated shape as shown in FIG. Therefore, the workability of the second housing 2 is good, and the second housing 2 can be manufactured at a low cost.

  Next, an example of a more specific configuration inside the first housing 1 will be described. FIG. 6 is a schematic enlarged cross-sectional view showing a first state of the mobile terminal device according to the first embodiment.

  As shown in FIG. 6, a circuit board 6 and various component parts 7 mounted on the circuit board 6 are provided in the first housing 1. A parametric speaker 60 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, in order not to prevent the sound wave output from the parametric speaker 60 from reaching the sound emission hole 4, the vibration surface of the parametric speaker 60, that is, any part of the vibration member 30 and the vibrator 20, and the sound emission hole. The circuit board 6 and the component parts 7 are arranged so that no obstacle is positioned on a straight line connecting any one of the four parts. Preferably, 0.3 mm or less (for example, 0 mm) connecting any part of the vibration member 30 and the vibrator 20 and any part of the sound emission hole 4 between the circuit board 6 and the component part 7. A linear gap having a diameter of about 1 mm) exists. As described above, since the sound wave output from the parametric speaker 60 has high straightness, the sound wave can be guided to the sound emission hole 4 through this gap.

According to the first embodiment as described above, the first waveguide 31 is slid when the relative positional relationship between the first and second casings 1 and 2 is in the first state. The sound wave emitted from the parametric speaker 60 is guided and radiated to the outside in the first direction. The second waveguide 32 guides sound waves emitted from the parametric speaker 60 when the relative positional relationship between the first and second housings 1 and 2 is in the second state by the slide. Radiates to the outside in a second direction different from the first direction.
Therefore, sound waves can be radiated through the waveguides (the first waveguide 31 and the second waveguide 32) in each of the plurality of sliding states of the slide type mobile terminal device. In addition, the radiation direction of the sound from the second casing 2 can be switched in conjunction with the sliding operation. In other words, the directivity of the sound radiated from the second casing 2 can be switched in conjunction with the sliding operation of the first and second casings 1 and 2.
And when providing the 1st and 2nd waveguides 31 and 32 for radiating | emitting a sound wave in each of the some sliding state of a slide type portable terminal device in this way, a housing | casing (2nd housing | casing 2) Deterioration of workability and cost increase of the housing (second housing 2) can be suppressed while suppressing a decrease in strength.

In general, in order to control the directivity in a parametric speaker, a large number of ultrasonic transducers are arranged in an array like the phased array method, and the ultrasonic waves transmitted from these ultrasonic transducers with different timings are synthesized. By doing so, there is a method of reproducing sound. However, since this configuration requires a large number of ultrasonic transducers, it has been difficult to mount in a small mobile terminal device such as a mobile phone.
On the other hand, in the present embodiment, the number of vibrators 20 of the parametric speaker 60 is one in order to switch the directivity of sound radiated in conjunction with the sliding operation of the first and second casings 1 and 2. But it ’s okay. For this reason, even in a small portable terminal device such as a cellular phone, the directivity of the parametric speaker 60 can be easily controlled and sound waves can be selectively output in a specific direction.

[Second Embodiment]
7 and 8 are schematic views of the mobile terminal device according to the second embodiment. Of these, FIG. 7 shows the first state, and FIG. 8 shows the second state. 7A and 8A are plan views, and FIG. 7B and FIG. 8B are cross-sectional views.

  In the case of this embodiment, only the shape of the first waveguide 31 is different from that of the first embodiment, and the other points are the same as those of the first embodiment.

  As shown in FIGS. 7A and 8A, in the case of this embodiment, the first waveguide 31 has two linear portions 31a and 31b that intersect each other. That is, the first waveguide 31 is configured by forming two linear grooves intersecting each other in the second casing 2. In the first state, for example, the intersection of these linear portions 31 a and 31 b communicates with the sound emission hole 4.

  Therefore, in the first state, sound waves are radiated in a total of four directions from the end portions of the two linear portions 31a and 31b. That is, sound waves are radiated in the directions of arrows E and F from one side surface of the second housing 2, and sound waves are radiated in the directions of arrows G and H from the other side surface. Thus, in the present embodiment, the first waveguide 31 emits sound waves from three or more locations on the side surface of the second housing 2 in the direction intersecting the direction of linear movement by sliding.

  In this embodiment, the second state (FIGS. 7B and 8B) is the same as that of the first embodiment.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained, and the radiation direction of the sound wave in the first state can be increased as compared with the case of the first embodiment.

[Third Embodiment]
9 and 10 are schematic views of a mobile terminal device according to the third embodiment. 9A and 10A are plan views, and FIG. 9B and FIG. 10B are cross-sectional views. In the present embodiment, the state of FIG. 10 in which the mobile terminal device is contracted is the first state, and the state of FIG. 9 in which the mobile terminal device is extended is the second state.

  In the case of this embodiment, the shapes of the first and second waveguides 31 and 32 are different from those of the first embodiment. Other points are the same as in the first embodiment.

  Also in the present embodiment, the first waveguide 31 is orthogonal to the sliding direction (arrow A direction) in a plane parallel to the mutually opposing surfaces of the first and second casings 1 and 2. It extends in the direction, and more specifically, is formed between both side surfaces of the second housing 2 in this direction. However, in the case of this embodiment, the first waveguide 31 is formed at a position communicating with the sound emission hole 4 in the state of FIG.

  In the case of the present embodiment, in the first state (FIG. 10), the first waveguide 31 communicates with the sound emission hole 4, and the first waveguide 31 guides the sound wave emitted from the parametric speaker 60 to the first state. Radiates to the outside of the mobile terminal device in one direction (for example, the arrow K direction and L direction in FIG. 10).

  On the other hand, in the case of this embodiment, the second waveguide 32 is a sound passage formed at a position facing the sound emission hole 4 in the second casing 2 in the second state (FIG. 9 in this embodiment). A hole 81, an internal waveguide 82 that is formed in the second housing 2 and communicates with the sound passage hole 81, and a second sound emission hole 83 that communicates the internal waveguide 82 with the outside of the second housing 2. ,have.

  In the case of the present embodiment, in the second state (FIG. 9), the sound wave output from the parametric speaker 60 enters the internal waveguide 82 through the sound emission hole 4 and the sound passage hole 81 in this order. Thereafter, the sound wave passes through the internal waveguide 82 to the second sound emitting hole 83 and is radiated to the outside of the second housing 2 through the second sound emitting hole 83. That is, in the second state, the second waveguide 32 guides the sound wave emitted from the parametric speaker 60 and radiates it outside the portable terminal device in the second direction (for example, the direction of arrow I in FIG. 9).

  The first waveguide 31 and the internal waveguide 82 are arranged at different positions in the thickness direction of the second housing 2, and the first waveguide 31 and the second waveguide 32 cross each other three-dimensionally. ing. The first waveguide 31 and the second waveguide 32 are separated from each other by a partition wall 33 that is a part of the second housing 2.

  Next, an example of a more specific configuration inside the second housing 2 will be described. FIG. 11: is a typical expanded sectional view which shows the 2nd state of the portable terminal device which concerns on 3rd Embodiment.

  As shown in FIG. 11, not only inside the first housing 1 but also inside the second housing 2, a circuit board 6 and various component parts 7 mounted on the circuit board 6 are provided. , Is provided. For example, the surface on which the component 7 is mounted on the circuit board 6 in the second housing 2 faces the back surface of the liquid crystal display device 5.

  In the case of the present embodiment, the sound wave that has entered the second housing 2 through the sound emission hole 4 and the sound passage hole 81 is the distance between the components in the second housing 2 (that is, the internal waveguide 82). ) And is radiated to the outside through the second sound emission hole 83. Specifically, for example, as shown in FIG. 11, the sound wave that has passed through the sound hole 81 is bent toward the second sound emitting hole 83 side by being abutted against the back surface of the liquid crystal display device 5. Each component in the 2nd housing | casing 2 is arrange | positioned so that the course of such a sound wave may not be prevented. Preferably, it is a linear gap connecting any part of the sound hole 81 and any part on the back surface of the liquid crystal display device 5 and has an equivalent circle diameter of, for example, 0.3 mm or less (for example, 0.1 mm). Is a linear gap connecting the part on the back surface of the liquid crystal display device 5 and any part of the second sound emitting hole 83, and the equivalent circle diameter is, for example, 0. There is a gap of 3 mm or less (for example, about 0.1 mm). The internal waveguide 82 is constituted by these gaps. As described above, since the sound wave output from the parametric speaker 60 has high straightness, the sound wave can be guided from the sound hole 81 to the second sound hole 83 through the gap (internal waveguide 82).

  According to the third embodiment, the same effect as in the first embodiment can be obtained.

[Fourth Embodiment]
12 to 14 are schematic views of a mobile terminal device according to the fourth embodiment. 12 shows the third state, FIG. 13 shows the first state, and FIG. 14 shows the second state. 12 (a), 13 (a) and 14 (a) are plan views, and FIG. 12 (b), FIG. 13 (b) and FIG. 14 (b) are sectional views. The mobile terminal device according to the present embodiment is different from the mobile terminal device according to the first embodiment in the points described below, and is otherwise configured in the same manner as the mobile terminal device according to the first embodiment. Yes.

  FIG. 12 shows a state (third state) in which the total length of the mobile terminal device including the first and second housings 1 and 2 is extended most by the slide. FIG. 14 shows a state (second state) in which the entire length of the mobile terminal device is contracted most by the slide. FIG. 13 shows a state (first state) in which the total length of the mobile terminal device is intermediate between the second state and the third state.

  In the present embodiment, a first parametric speaker 160 is provided in the first housing 1, and a second parametric speaker 260 is provided in the second housing 2. The first and second speakers 160 and 260 are each configured in the same manner as the parametric speaker 60 described above.

  The first housing 1 has a sound emission hole 164 at a position facing the first parametric speaker 160, and the second housing 2 has a sound emission hole 264 at a position facing the second parametric speaker 260. Is formed. The sound emitting hole 164 is formed on the surface of the first housing 1 facing the second housing 2, and the sound emitting hole 264 is formed on the surface of the second housing 2 facing the first housing 1. Has been.

In the third state, the sound emission hole 164 is not covered by the second casing 2 and is opened. For this reason, in the third state, the sound wave emitted from the first parametric speaker 160 is radiated in the direction of arrow J through the sound emission hole 164.
Similarly, in the third state, the sound emission hole 264 is not covered by the first housing 1 and is opened. For this reason, in the third state, the sound wave emitted from the second parametric speaker 260 is radiated in the arrow K direction through the sound emission hole 264.

In addition, a waveguide 131 and a waveguide 132 are formed on the surface of the second casing 2 that faces the first casing 1. A waveguide 132 is formed on the surface of the first housing 1 facing the second housing 2.
Among these, the waveguide 131 is a first waveguide, and the waveguide 133 is a second waveguide.

The waveguide 131 is formed at a position communicating with the sound emission hole 164 in the first state (FIG. 13). On the other hand, the waveguide 133 is formed at a position communicating with the sound emission hole 164 in the second state (FIG. 14). Further, the waveguide 132 is formed at a position communicating with the sound emission hole 264 in the second state.
The direction in which the waveguides 131, 132, and 133 extend is arbitrary, but in the case of this embodiment, the waveguides 131, 132, and 133 all extend between both side surfaces of the second housing 2, for example. It is extended.

In the first state (FIG. 13), sound waves emitted from the first parametric speaker 160 are radiated in the arrow L direction and the M direction from both ends of the waveguide 131 through the sound emission holes 164 and the waveguide 131 in this order. Is done.
Note that the sound emission hole 264 of the second parametric speaker 260 remains open in the first state. For this reason, the sound wave emitted from the second parametric speaker 260 is radiated in the arrow K direction in the first state as in the third state.

In the second state (FIG. 14), the sound wave emitted from the first parametric speaker 160 passes through the sound emitting hole 164 and the waveguide 133 in this order, from both ends of the waveguide 133 in the directions of the arrows N and O, respectively. Radiated.
In the second state, the sound wave emitted from the second parametric speaker 260 is radiated from both ends of the waveguide 132 in the arrow P direction and the Q direction through the sound emitting hole 264 and the waveguide 132 in this order.

  Also according to the fourth embodiment, sound waves can be radiated through the waveguides (the waveguide 131 and the waveguide 133) in each of the plurality of sliding states of the slide type mobile terminal device. In the case of the present embodiment, sound waves can be emitted through the waveguides 131 to 133 or directly from the sound emission holes 164 and 264 in each of the three stages of sliding states.

Also in the case of the fourth embodiment, the extending directions of the waveguide 131 and the waveguide 133 may be set so that the radiation directions of the sound waves are different between the first state and the second state.
[Fifth Embodiment]
The parametric speaker 60 of the mobile terminal device according to the present embodiment includes a MEMS (Micro Electro Mechanical Systems) actuator 70 illustrated in FIG. 15 instead of the vibrator 20. 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 to fourth embodiments.

  In the example shown in FIG. 15, 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 liquid crystal display device 5 is provided in such an arrangement that the liquid crystal display device 5 is exposed in any of the first and second states is shown. For example, the first casing 1 is disposed on the surface facing the second casing 2 and is covered with the second casing 2 in a state where the portable terminal device is contracted (FIGS. 2, 8, and 10). Anyway.

  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.

  Further, since the grooves constituting the first and second waveguides 31 and 32 may be very shallow, at least a part of the first and second waveguides 31 and 32 is a transparent cover (which covers the surface of the liquid crystal display device 5). Even if it is formed on the surface layer (not shown), the visibility of the liquid crystal display device 5 does not deteriorate so much. Therefore, specifically, for example, the first and second waveguides 31 and 32 can be formed from the surface layer of the transparent cover to the surface layer of the second casing 2. By doing in this way, the freedom degree of the layout of the 1st and 2nd waveguides 31 and 32 and the liquid crystal display device 5 increases.

DESCRIPTION OF SYMBOLS 1 1st housing | casing 2 2nd housing | casing 2a End surface 4 Sound emission hole 5 Liquid crystal display device 6 Circuit board 7 Component 20 Vibrator 22 Piezoelectric body 24 Upper surface electrode 26 Lower surface electrode 30 Vibration member 31 1st waveguide 31a Straight line Shaped portion 31b linear portion 32 second waveguide 33 partition wall 40 support member 50 control portion 54 signal generation portion 60 parametric speaker 70 MEMS actuator 72 piezoelectric thin film layer 74 upper movable electrode layer 76 lower movable electrode layer 81 sound passage hole 82 inside Waveguide 83 Second sound emitting hole 131 Waveguide 132 Waveguide 133 Waveguide 160 First parametric speaker 164 Sound emitting hole 260 Second parametric speaker 264 Sound emitting hole 1000 Housing 1001 Groove

Claims (10)

First and second housings slidably connected to each other;
A parametric speaker provided in the first housing;
First and second waveguides formed in the second housing;
A sound emitting hole formed in the first housing and radiating a sound wave emitted from the parametric speaker to the outside of the first housing;
Have
The first waveguide communicates with the sound emitting hole and guides sound waves emitted from the parametric speaker when the relative positional relationship between the first and second housings by the slide is in the first state. Radiate to the outside,
When the positional relationship by the slide is in the second state, the second waveguide communicates with the sound emitting hole, guides the sound wave, and radiates to the outside.
The first waveguide is configured by forming a first groove on a surface of the second casing that faces the first casing.   A direction in which the first waveguide emits the sound wave in the first state and a direction in which the second waveguide emits the sound wave in the second state are different from each other. The mobile terminal device according to claim 1.   The depth of the said 1st groove | channel is 0.3 mm or less, The portable terminal device of Claim 1 or 2 characterized by the above-mentioned. The second waveguide is configured by forming a second groove on a surface of the second casing facing the first casing,
The depth of the said 2nd groove | channel is 0.3 mm or less, The portable terminal device as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. The second waveguide is
A sound passage hole formed at a position facing the sound emission hole in the second case in the second state;
An internal waveguide formed in the second housing and in communication with the sound hole;
A second sound emitting hole for communicating the internal waveguide with the outside of the second housing;
The mobile terminal device according to claim 1, wherein the mobile terminal device includes: The first and second housings move linearly with each other in the direction in which the total length of the first and second housings extends and contracts by the slide,
The said 1st waveguide radiates | emits the said sound wave from the side surface of the said 2nd housing | casing in the direction which cross | intersects the direction of the said linear movement. Mobile terminal device. The first and second housings move linearly with each other in the direction in which the total length of the first and second housings extends and contracts by the slide,
5. The mobile terminal device according to claim 1, wherein the second waveguide radiates the sound wave from an end surface of the second housing in the linear movement direction. 6. The parametric 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;
The mobile terminal device according to claim 1, comprising:   9. The portable terminal device according to claim 8, wherein the input unit oscillates a sound wave having a frequency of 20 kHz or more from the vibrator and the vibration member by vibrating the vibrator at a frequency of 20 kHz or more. .   The portable terminal device according to claim 8, wherein the vibrator is a piezoelectric vibrator or a MEMS (Micro Electro Mechanical Systems).

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