JP2012034122A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a waveguide for switching the radiation direction of acoustic waves according to a change of the form of a portable terminal device, by using a groove, such that deterioration of strength of a housing is suppressed and deterioration of workability of the housing and cost increase are suppressed as well.SOLUTION: The portable terminal device includes a first and a second housings 1, 2 that are connected to be mutually slidable and to be rotative at a specified slide position, a parametric speaker 60 disposed in the first housing 1, a sound emitting hole 4, and a first to a third waveguides 11-13 formed in the second housing 2. The first waveguide 11 radiates acoustic waves in a first direction when a slide position is in a first state, and the second waveguide 12 radiates acoustic waves in a second direction when the slide position is in a second state. The third waveguide 13 radiates acoustic waves in a third direction when a rotational phase is in a third state which is different from the first or the second state. One of the first to the third waveguides 11-13 is configured by grooves (a first and a second grooves 21, 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, 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.

JP 2006-157199 A

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. 9B, it is preferable to process the housing 1000 into a shape such that the thickness T does not change even at the location where the groove 1001 is formed.

  However, processing the housing 1000 into a complicated shape as shown in FIG. 9B not only complicates the processing 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 switching the sound wave emission direction according to a change in the form of a mobile terminal device is provided by forming a groove in the housing. 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, the first and second housings connected to each other so as to be slidable to each other and to be mutually rotatable at a specific sliding position;
A parametric speaker provided in the first 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;
First to third waveguides formed in the second housing;
Have
The first waveguide communicates with the sound emission hole when the relative positional relationship between the first and second housings by the slide is in the first state, and guides the sound wave in the first direction. Radiate to the outside,
The second waveguide communicates with the sound emitting hole when the positional relationship by the slide is in the second state, and guides the sound wave to be radiated to the outside in a second direction different from the first direction. ,
The third waveguide communicates with the sound emitting hole when a relative rotational phase of the first and second housings is in a third state different from any of the first and second states, Guides sound waves and emits them in a third direction different from the first and second directions,
At least one of the first to third waveguides is configured by forming a groove in a surface of the second casing that faces the first casing. A portable terminal device is provided.

  ADVANTAGE OF THE INVENTION According to this invention, when providing the waveguide for switching the radiation direction of a sound wave according to the change of the form of a portable terminal device by forming a groove | channel in a housing | casing, suppressing the fall of the intensity | strength of a housing | casing. Moreover, deterioration of the workability of the housing and cost increase can be suppressed.

It is a typical sectional side view which shows each of three states of the portable terminal device which concerns on 1st Embodiment. It is a schematic diagram which shows each of three states 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 which shows the 3rd state of the portable terminal device which concerns on 1st Embodiment. It is a typical sectional side view which shows the 3rd state 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 parametric speaker with which the portable terminal device which concerns on 3rd 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]
FIG. 1 is a schematic side sectional view of a mobile terminal device according to the first embodiment, and FIGS. 2A to 2C are schematic plan views of the mobile terminal device according to the first embodiment. Of these, FIGS. 1 (a) and 2 (a) show the first state, FIGS. 1 (b) and 2 (b) show the second state, and FIGS. 1 (c) and 2 (c). Indicates the third state, respectively. Moreover, FIG.2 (d) thru | or FIG.2 (f) are auxiliary | assistant schematic diagrams for demonstrating the deformation | transformation operation | movement of a portable terminal device. 2D is a side view showing the deformation operation from the first state to the second state, and FIG. 2E is a plan view showing the deformation operation from the second state to the third state. FIG. 2F is a plan view showing the third state.

  The portable terminal device according to the first embodiment includes first and second casings 1 and 2 connected to each other so as to be slidable to each other and to be mutually rotatable at a specific slide position, A parametric speaker 60 provided in one housing 1, and a sound emission hole 4 formed in the first housing 1 for radiating sound waves emitted from the parametric speaker 60 to the outside of the first housing 1; And first to third waveguides 11, 12, and 13 formed in the second housing 2. The first waveguide 11 communicates with the sound emission hole 4 when the relative positional relationship between the first and second housings 1 and 2 by the slide is in the first state, and guides the sound wave in the first direction. Radiate to the outside. When the positional relationship by the slide is in the second state, the second waveguide 12 communicates with the sound emitting hole 4, guides the sound wave, and radiates it in the second direction different from the first direction. The third waveguide 13 emits sound when the relative rotational phase of the first and second casings 1 and 2 is in a third state where the relative rotational phase is different from both the first and second states. It communicates with the hole 4, guides the sound wave, and radiates outside in a third direction different from the first and second directions. At least one of the first to third waveguides 11 to 13 (for example, the first and second waveguides 11 and 12) faces the first casing 1 in the second casing 2. It is configured by forming grooves (first groove 21 and second groove 22) on the surface. 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 casings 1 and 2 are coupled to each other by a coupling mechanism (not shown) so that they can slide with each other and can rotate with each other at a specific sliding position.

  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). For example, FIG. 1 (b), FIG. 2 (b), and FIG. 2 (e) show a state where the entire length of the mobile terminal device is the most extended (second state), and FIG. 1 (a), FIG. d) is a state in which the total length of the mobile terminal device is most contracted (first state). As shown in FIG. 2D, in the first state, the second housing 2 is slid relative to the first housing 1 in the direction of arrow B, so that the mobile terminal device It transforms into a state.

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

  In addition, the first and second casings 1 and 2 cannot rotate with respect to each other in the first state, but the second casing 2 becomes the first casing 1 up to the position where the second state is reached. In the state of sliding, the second housing 2 can rotate in the direction of arrow C relative to the first housing 1 as shown in FIG. When the second casing 2 is rotated in the direction of arrow C (for example, rotated by 90 °) in the second state, the mobile terminal device is transformed into the third state (FIG. 2 (f)). Note that the position of the rotating shaft in this rotation may be configured to move from the start to the end of the rotation, or may be unchanged from the start to the end of the rotation. In the former case, the second casing 2 rotates while sliding relative to the first casing 1 from the start to the end of rotation.

  To return from the third state to the second state, the second housing 2 is rotated relative to the first housing 1 in the opposite direction of the arrow C direction from the third state (for example, 90 (° rotation). In order to return from the second state to the first state, the second housing 2 is slid relative to the first housing 1 in the opposite direction to the arrow B direction from the second state. Good to do.

  The sliding direction (the direction of arrow A) is included in the rotation surface when the first and second casings 1 and 2 rotate relatively.

  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 emitting hole 4 faces the second casing 2 in any of the first to third states.

  First to third waveguides 11, 12, and 13 are formed in the second housing 2. In the case of this embodiment, among these, the first and second waveguides 11 and 12 are formed by forming grooves 21 and 22 on the surface of the second casing 2 facing the first casing 1, respectively. It is configured.

In the first state, the first waveguide 11 (first groove 21) is, for example, in a sliding direction (arrow) in a plane parallel to the mutually opposing surfaces of the first and second casings 1 and 2. It extends in a direction orthogonal to (A direction). More specifically, the first waveguide 11 is formed between both side surfaces of the second casing 2 in this direction.
The first waveguide 11 (first groove 21) is formed at a position facing the sound emitting hole 4 and communicating with the sound emitting hole 4 in the first state (FIG. 2A). Yes. In this state, the first waveguide 11 (first groove 21) is covered with the first casing 1, and the sound wave is transmitted through the space between the first waveguide 11 and the first casing 1. Can guide you.
Therefore, in the first state, the sound wave emitted from the parametric speaker 60 enters the first waveguide 11 through the sound emission hole 4 and is guided by the first waveguide 11 in the first direction (FIG. 2). Radiates to the outside of the portable terminal device in the direction of arrows D and E in (a).
That is, the first waveguide 11 radiates sound waves from the side surface (more specifically, for example, both side surfaces) of the second housing 2 in the direction intersecting the linear movement direction by the slide.

Moreover, the 2nd waveguide 12 (2nd groove | channel 22) is extended in the direction (arrow A direction) of the linear movement by a slide in a 2nd state. More specifically, for example, one end of the second waveguide 12 reaches the end surface 2a of the second housing 2 in the sliding direction that reduces the overall length of the mobile terminal device.
When the second waveguide 12 is in the second state (FIG. 2 (a), FIG. 1 (b)), the other end of the second waveguide 12 faces the sound emission hole 4 and the sound emission hole. 4 is formed so as to communicate with 4. In this state, the second waveguide 12 is covered with the first housing 1, and a sound wave can be guided through the space between the second waveguide 12 and the first housing 1.
For this reason, in the second state, the sound wave emitted from the parametric speaker 60 enters the second waveguide 12 through the sound emitting hole 4 and is guided by the second waveguide 12 to be different from the first direction. It radiates | emits the exterior of a portable terminal device in a 2nd direction (For example, the arrow F direction of FIG.1 (b) and FIG.2 (b)).
That is, the second waveguide 12 emits 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 radiated from the first waveguide 11 in the first state (directions of arrows D and E) and the second state in the second state. The direction in which sound waves are radiated from the waveguide 12 (the direction of the arrow F) is 90 ° different from each other.

The third waveguide 13 extends in parallel with the first waveguide 11, for example. More specifically, for example, one end of the third waveguide 13 reaches one side surface 2 b of the second housing 2.
The second waveguide 13 has a sound passage hole 81 formed at a position facing the sound emission hole 4 when the second case 2 is in the third state, and a sound passage hole formed in the second case 2. An internal waveguide 82 that communicates with the hole 81 and a second sound emitting hole 83 that communicates the internal waveguide 82 with the outside of the second housing 2 are provided.
In the third state, 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. As described above, the third waveguide 13 guides the sound wave emitted from the parametric speaker 60 and is different from the first and second directions in the third direction (for example, the arrow G in FIGS. 1C and 2C). Direction) to the outside of the mobile terminal device. The arrow G direction is, for example, the opposite direction of the arrow F direction.

  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, 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.

  Further, for example, the mobile terminal device has a TV viewing function and the like, and can watch TV in each of the first to third states. Sound such as TV is output from the parametric speaker 60. For this reason, when watching TV or the like, sound can be emitted in directions corresponding to the first to third states.

  As described above, the output direction of the sound from the portable terminal device can be switched in conjunction with the change in the form of the first and second casings 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 25, an upper surface electrode 24, and a lower surface electrode 26.

The piezoelectric body 25 is polarized in the thickness direction. The material constituting the piezoelectric body 25 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 25 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 25, 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 speaker 60, and is formed in, for example, a cylindrical shape (for example, a cylindrical shape) having an outer diameter = φ22 mm and an inner diameter = φ20 mm.

  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 depth and width of the groove 21 constituting the first waveguide 11 can be set to, for example, 0.3 mm or less, respectively, and more specifically, for example, about 0.1 mm. The same applies to the depth and width of the groove 22 constituting the second waveguide 12.

  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. The same applies to the sound emission hole 83.

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.
Further, as described above, the diameters (depth and width) of the waveguides (first waveguide 11 and second waveguide 12) for guiding the sound wave output from the parametric speaker 60 are 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, the strength of the second casing 2 can be sufficiently ensured without processing the second casing 2 into a complicated shape as shown in FIG. 9B. 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 second housing 2 will be described. FIG. 6 is a schematic enlarged cross-sectional view showing a third state of the mobile terminal device according to the first embodiment.

  As shown in FIG. 6, a circuit board 6 and various components 7 mounted on the circuit board 6 are provided in the first and second casings 1 and 2, respectively. . The component 7 is, for example, an electronic component such as a discrete component or a semiconductor package. 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. The speaker 60 is provided on the circuit board 6, for example. When the circuit board 6 is located between the speaker 60 and the sound emission hole 4, a sound passage hole 86 for passing sound waves is formed in the circuit board 6.

  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 sound emission hole 83. Specifically, for example, as shown in FIG. 6, the sound wave that has passed through the sound hole 81 is bent toward the sound emission 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 portion on the back surface of the liquid crystal display device 5 and any portion of the sound emission hole 83, and the equivalent circle diameter is, for example, 0.3 mm or less. There is a gap (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 sound hole 83 through the gap (internal waveguide 82).

According to the first embodiment as described above, the first waveguide 11 communicates with the sound emitting hole 4 when in the first state, guides the sound wave emitted from the parametric speaker 60, and is external in the first direction. Radiates to. The second waveguide 12 communicates with the sound emitting hole 4 in the second state, guides the sound wave, and radiates it in the second direction different from the first direction. The third waveguide 13 communicates with the sound emitting hole 4 in the third state, guides the sound wave, and radiates it in the third direction different from the first and second directions. That is, the directivity of the sound output from the mobile terminal device can be switched in conjunction with the slide operation and the rotation operation of the mobile terminal device.
And the waveguide (the 1st and 2nd waveguides 11 and 12) for switching the radiation direction of a sound wave according to the change of the form of a portable terminal device in this way is a slot (second housing 2) in a groove ( When provided by forming the grooves 21 and 22), deterioration in workability and cost of the casing (second casing 2) are suppressed while suppressing a decrease in strength of the casing (second casing 2). An increase can also be suppressed.

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 this embodiment, the number of vibrators 20 of the parametric speaker 60 is changed in order to switch the directivity of the sound output in conjunction with the sliding operation and the rotating operation of the first and second casings 1 and 2. May be one. 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 a sound wave can be selectively emitted in a specific direction.

[Second Embodiment]
FIG. 7 is a schematic side cross-sectional view of the mobile terminal device according to the second embodiment. Here, FIG. 7 shows a third state. About the 1st and 2nd state, since it is the same as that of 1st Embodiment, illustration is abbreviate | omitted.

In the case of this embodiment, only the shape of the third waveguide 13 is different from that of the first embodiment, and the other points are the same as those of the first embodiment. In the case of the present embodiment, the third waveguide 13 is configured by forming a third groove 23 on the surface of the second casing 2 on the first casing 1 side. In the case of the present embodiment, the plan view in the third state is the same as FIG. According to the second embodiment as described above, the same effect as that of the first embodiment can be obtained.
[Third Embodiment]
The parametric speaker 60 of the portable terminal device according to the present embodiment has a MEMS (Micro Electro Mechanical Systems) 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. 8, 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, it is arranged on the surface of the first casing 1 on the second casing 2 side and is covered by the second casing 2 in a state where the portable terminal device is contracted (FIGS. 1A and 2A). You may be made to be.

  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.

  In the first embodiment, the example in which the third waveguide 13 is configured by the sound passage hole 81, the internal waveguide 82, and the sound emission hole 83 has been described, but the first and second waveguides 11 and 12 are described. The same may be applied to the above. However, at least one of the first to third waveguides 11 to 13 is constituted by a groove.

  In the above description, the example in which the sound emitting hole (second sound emitting hole 83) of the third waveguide 13 is formed only on one side surface of the second housing 2 has been described. 13 internal waveguides 82 may be formed between both side surfaces of the second housing 2, and the second sound emission holes 83 may be provided on both side surfaces of the second housing 2.

DESCRIPTION OF SYMBOLS 1 1st housing | casing 2 2nd housing | casing 2a End surface 2b Side surface 4 Sound emission hole 5 Liquid crystal display device 6 Circuit board 7 Component 11 First waveguide 12 Second waveguide 13 Third waveguide 20 Vibrator 21 First 1 groove 22 2nd groove 23 3rd groove 24 upper surface electrode 25 piezoelectric body 26 lower surface electrode 30 vibration member 32 second waveguide 40 support member 50 control unit 54 signal generation unit 60 parametric speaker 70 actuator 72 piezoelectric thin film layer 74 Upper movable electrode layer 76 Lower movable electrode layer 81 Sound hole 82 Internal waveguide 83 Second sound hole 1000 Housing 1001 Groove

Claims (9)

First and second housings that are slidable relative to each other and coupled to each other so as to be rotatable relative to each other at a specific sliding position;
A parametric speaker provided in the first 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;
First to third waveguides formed in the second housing;
Have
The first waveguide communicates with the sound emission hole when the relative positional relationship between the first and second housings by the slide is in the first state, and guides the sound wave in the first direction. Radiate to the outside,
The second waveguide communicates with the sound emitting hole when the positional relationship by the slide is in the second state, and guides the sound wave to be radiated to the outside in a second direction different from the first direction. ,
The third waveguide communicates with the sound emitting hole when a relative rotational phase of the first and second housings is in a third state different from any of the first and second states, Guides sound waves and emits them in a third direction different from the first and second directions,
At least one of the first to third waveguides is configured by forming a groove in a surface of the second casing that faces the first casing. Mobile terminal device.   The portable terminal device according to claim 1, wherein a depth of the groove is 0.3 mm or less.   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 portable terminal device described.   The mobile terminal device according to any one of claims 1 to 3, wherein the direction of the slide is a direction included in a rotation surface of the rotation. At least one of the first to third waveguides is
A sound passage hole formed in the second housing and facing and communicating with the sound emission hole in any of the first to third states;
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;
5. The mobile terminal device according to claim 1, comprising: 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, wherein the mobile terminal device includes:   The portable terminal device according to claim 6, 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 6, wherein the vibrator is a piezoelectric vibrator.   The portable terminal device according to claim 6, wherein the vibrator is a micro electro mechanical system (MEMS).

Images