JP2012029100A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus such as a mobile phone capable of regulating an output sound of a speaker unit on the basis of determination of a user's prescribed attribute.SOLUTION: A mobile phone 100, measuring a user's body temperature by making the user output an ultrasonic wave from a piezoelectric vibrator 113 and measuring the ultrasonic wave that is reflected, is capable of measuring the user's temperature, for instance, by using the piezoelectric vibrator 113 and the like that is used to output a ringing sound in an electronic apparatus such as the mobile phone 100.

Description

  The present invention relates to an electronic device such as a mobile phone, and more particularly to an electronic device including a microphone and a parametric speaker.

  In recent years, demand for portable electronic devices such as mobile phones and notebook computers has been increasing. In such an electronic device, development of a thin portable terminal whose commercial value is an acoustic function such as a videophone, a video playback, and a hands-free phone is being promoted. Under such development, there is an increasing demand for high-quality sound, small size, and thinness for electroacoustic transducers (speaker devices) that are acoustic components.

  Currently, electrodynamic electroacoustic transducers are used as electroacoustic transducers in electronic devices such as mobile phones. This electrodynamic electroacoustic transducer is composed of a permanent magnet, a voice coil, and a diaphragm.

  However, there is a limit to reducing the thickness of electrodynamic electroacoustic transducers due to their operating principles and structures. On the other hand, Patent Documents 1 and 2 describe using a piezoelectric element as an electroacoustic transducer.

  Further, as other examples of the oscillation unit using the piezoelectric element, in addition to a speaker device, there are various acoustic wave sensors (Patent Document 3) that detect a distance to an object using a sound wave oscillated from the piezoelectric element. Is known (Patent Document 4).

No. 2007-026736 Table 2007-083497 Japanese Patent Laid-Open No. 03-270282 JP 2010-056877 A

  Mobile phones and the like, which are electronic devices used by users, have a variety of functions other than telephone calls, and various functions are provided. However, at present, the function of notifying the user's health status is not substantial. In addition, there is a mobile phone or the like that detects and notifies the health state of the user. In that case, a dedicated device is added, and the entire apparatus is enlarged and productivity is reduced.

  The present invention has been made in view of the above-described problems, and provides an electronic apparatus such as a mobile phone that can measure a user's body temperature without adding a dedicated device.

  The electronic apparatus of the present invention includes at least one piezoelectric vibrator in which a piezoelectric element is supported by an elastic member, output control means for outputting ultrasonic waves from the piezoelectric vibrator to a user, and detecting ultrasonic waves reflected by the user. And a body temperature measuring means for measuring the body temperature of the user from the ultrasonic detection result.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  In the electronic device of the present invention, the body temperature is measured by detecting the reflected ultrasonic wave output from the piezoelectric vibrator to the user. For example, the user's body temperature can be measured by an electronic device such as a mobile phone. it can. Such a piezoelectric vibrator is used for, for example, calling voice output or hands-free calling, so that it is not necessary to add a dedicated device for measuring body temperature, thereby preventing an increase in the size of the entire apparatus. be able to.

It is a typical block diagram which shows the circuit structure of the mobile telephone which is an electronic device of embodiment of this invention. It is a typical front view which shows the external appearance of a mobile telephone. It is a vertical side view which shows the structure of the principal part of the parametric speaker which is an oscillation unit. It is a typical front view which shows the structure of a parametric speaker. It is a flowchart which shows the processing operation of a mobile telephone.

  An embodiment of the present invention will be described with reference to FIGS. A cellular phone 100 that is an electronic apparatus according to the present embodiment includes at least one piezoelectric vibrator 113 in which a piezoelectric element 111 is supported by an elastic member 112, and output control means that causes a user to output ultrasonic waves from the piezoelectric vibrator 113. And a sound wave detecting means for detecting the ultrasonic wave reflected by the user, and a body temperature measuring means for measuring the user's body temperature from the detection result of the ultrasonic wave.

  More specifically, in the mobile phone 100 according to the present embodiment, as shown in FIG. 2, the speakers 110 and 140 that output voice to the user and the microphones 121 and 122 that input voice uttered by the user. And having.

  In the mobile phone 100 of the present embodiment, as shown in FIG. 2, a display unit 102 is arranged in the upper half of the front surface of the vertically long main body housing 101, and a keyboard unit 103 is arranged in the lower half.

  Further, two microphones 121 and 122 are arranged one by one on the left and right sides of the lower end. A general electrodynamic speaker 140 for calling is disposed at the center of the upper end, and a parametric speaker 110 used for hands-free calling or music viewing is disposed on the side of the speaker.

  As shown in FIG. 1, the parametric speaker 110 is connected to a directivity control unit 130 that serves both as an output control unit, a sound wave detection unit, and a body temperature measurement unit, and the parametric speaker 110 is connected to the directivity control unit 130. A feedback connection is made via the amplifier circuit 115.

  The microphones 121 and 122 are also connected to a call transmission circuit that wirelessly transmits the input call voice. The electrodynamic speaker 140 is connected to a call reception circuit that wirelessly receives the call voice and outputs the voice. (Not shown).

  The directivity control unit 130 is composed of an LSI (Large Scale Integration) such as an ASIC (Application Specific Integrated Circuit) or the like, and causes the user to output ultrasonic waves from the piezoelectric vibrator 113 of the parametric speaker 110 as described above. The ultrasonic wave reflected and input to the piezoelectric vibrator 113 is detected, and the body temperature of the user is measured from the ultrasonic detection result.

  As shown in FIG. 3, the parametric speaker 110 includes a piezoelectric vibrator 113 in which a piezoelectric element 111 is supported by an elastic member 112, and the elastic member 112 is supported by a highly rigid frame 114.

  As shown in FIG. 4, the parametric speaker 110 has a plurality of piezoelectric vibrators 113 as described above arranged in a matrix. The parametric speaker 110 outputs a highly directional sound in a desired direction by individually controlling the drive of the piezoelectric vibrators 113 arranged in a matrix.

  The parametric speaker 110 has a plurality of piezoelectric vibrators 113 arranged in a matrix as described above. For example, half of the piezoelectric vibrators 113 are used for outputting ultrasonic waves, and the other half are used for inputting ultrasonic waves. Is done.

  The directivity control unit 130 also serves as content output means for outputting content corresponding to the measured body temperature, and selectively displays a plurality of pre-registered contents on the display unit 102. .

  As will be described in detail later, the mobile phone 100 according to the present embodiment drives the electrodynamic speaker 140 to perform a normal call and the parametric speaker 110 to drive the body temperature of the user CU. The body temperature measurement mode for measuring the temperature is set to be switchable.

The piezoelectric element 111 is not particularly limited as long as it is a material having a piezoelectric effect. However, a material having high electromechanical conversion efficiency, for example, lead zirco-titanate (PZT) is used. Alternatively, a material such as barium titanate (BaTiO ₃ ) can be used.

  The thickness of the piezoelectric element 111 is not particularly limited, but is preferably 10 μm or more and 500 μm or less. For example, when a thin film having a thickness of less than 10 μm is used as a ceramic material that is a brittle material, chipping or breakage occurs due to weak mechanical strength during handling, making handling difficult.

  Further, when a ceramic having a thickness of more than 500 μm is used, the conversion efficiency for converting electric energy into mechanical energy is remarkably lowered, and sufficient performance as the parametric speaker 110 cannot be obtained.

  In general, in a piezoelectric ceramic that generates an electrostrictive effect by inputting an electric signal, the conversion efficiency depends on the electric field strength. Since the electric field strength is expressed by the thickness / input voltage with respect to the polarization direction, an increase in thickness inevitably causes a decrease in conversion efficiency.

  In the piezoelectric element 111 of the present invention, upper / lower electrode layers (not shown) are formed on the main surface in order to generate an electric field. The upper / lower electrode layer is not particularly limited as long as it is a material having electrical conductivity, but it is preferable to use silver or silver / palladium. Silver is used as a general-purpose electrode layer with low resistance, and has advantages in manufacturing process and cost.

  Further, since silver / palladium is a low-resistance material excellent in oxidation resistance, there is an advantage from the viewpoint of reliability. The thickness of the upper / lower electrode layer is not particularly limited, but the thickness is preferably 1 μm or more and 50 μm or less.

  For example, when the thickness is less than 1 μm, since the film thickness is thin, it cannot be uniformly formed, and conversion efficiency may be reduced. As a technique for forming a thin film upper / lower electrode layer, there is a method of applying it in a paste form.

  However, when the piezoelectric element 111 is a polycrystal such as ceramic, the surface state is textured, so that the wet state at the time of application is poor, and there is a problem that a uniform electrode film cannot be formed without a certain thickness.

  On the other hand, when the film thickness of the upper / lower electrode layer exceeds 100 μm, there is no particular problem in manufacturing, but the upper / lower electrode layer becomes a constraining surface for the piezoelectric ceramic material which is the piezoelectric element 111, and energy conversion efficiency There is a problem of lowering.

  The piezoelectric element 111 of the parametric speaker 110 according to the present embodiment has a principal surface on one side constrained by an elastic member 112. The elastic member 112 has a function of adjusting the basic resonance frequency of the piezoelectric element 111. The basic resonance frequency f of the mechanical piezoelectric vibrator 113 depends on the load weight and compliance, as shown by the following equation.

[Equation 1]
f = 1 / (2πL√ (mC))
“M” is mass and “C” is compliance.

  In other words, since the compliance is the mechanical rigidity of the piezoelectric vibrator 113, this means that the fundamental resonance frequency can be controlled by controlling the rigidity of the piezoelectric element 111.

  For example, it is possible to shift the fundamental resonance frequency to a low range by selecting a material having a high elastic modulus or reducing the thickness of the elastic member 112. On the other hand, the fundamental resonance frequency can be shifted to a high range by selecting a material having a high elastic modulus or increasing the thickness of the elastic member 112.

  Conventionally, since the basic resonance frequency is controlled by the shape and material of the piezoelectric element 111, there are problems in design restrictions, cost, and reliability. However, as in the present invention, the elastic member 112, which is a constituent member. Since it can be easily adjusted to a desired fundamental resonance frequency by changing the above, the industrial value is great.

  The elastic member 112 is not particularly limited as long as it is a material having a high elastic modulus with respect to a ceramic that is a brittle material such as metal or resin, but general-purpose materials such as phosphor bronze and stainless steel are used from the viewpoint of workability and cost. used.

  The thickness of the elastic member 112 is preferably 5 μm or more and 1000 μm or less. When the thickness is less than 5 μm, the mechanical strength is weak, the function as a restraining member is impaired, and the processing accuracy is lowered, so that an error in the mechanical vibration characteristics of the piezoelectric element 111 occurs between manufacturing lots.

  In addition, when the thickness exceeds 1000 μm, there is a problem in that the restraint on the piezoelectric element 111 due to the increase in rigidity is strengthened and the vibration displacement amount is attenuated. In addition, the elastic member 112 of the present embodiment preferably has a longitudinal elastic modulus, which is an index indicating the rigidity of the material, of 1 GPa or more and 500 GPa or less. As described above, when the rigidity of the elastic member 112 is excessively low or excessively high, there is a problem that characteristics and reliability are impaired as a mechanical vibrator.

  Hereinafter, the operation principle of the parametric speaker 110 of the present embodiment will be described. The parametric speaker 110 according to the present embodiment radiates ultrasonic waves subjected to AM (Amplitude Modulation) modulation, DSB (Double Sideband modulation) modulation, SSB (Single-Sideband modulation) modulation, and FM (Frequency Modulation) modulation into the air. However, sound reproduction is performed on the principle that audible sound appears due to nonlinear characteristics when ultrasonic waves propagate in the air.

  Non-linearity includes a phenomenon in which the flow changes from laminar flow to turbulent flow when the Reynolds number indicated by the ratio between the inertial action and viscous action of the flow increases. That is, since the sound wave is slightly disturbed in the fluid, the sound wave propagates nonlinearly.

  However, the amplitude of the sound wave in the low frequency band is nonlinear, but the amplitude difference is very small, and is usually handled as a phenomenon of linear theory. On the other hand, nonlinearity can be easily observed with ultrasonic waves, and when radiated into the air, harmonics accompanying the nonlinearity are remarkably generated.

  In summary, sound waves are a dense state where molecular groups are mixed in the air, and if it takes time for the air molecules to recover rather than compress, the air that cannot be recovered after compression is continuously propagated air. This is the principle that an audible sound is generated by colliding with a molecule and generating a shock wave.

  In the configuration as described above, for example, as shown in FIG. 5, the mobile phone 100 according to the present embodiment is disposed close to the side of the head during normal calls (step S1-Y), and has two lower ends. The utterance of the user CU is input through the microphones 121 and 122, and the utterance of the other user (not shown) is output from the electrodynamic speaker 140 at the upper end (step S10).

  However, the mobile phone 100 according to the present embodiment is not limited to the general usage method as described above, but can be used to measure the body temperature of the user CU by, for example, a body temperature measurement mode using the parametric speaker 110 (step S2-Y). It can also be measured.

  In this case, the mobile phone 100 is disposed at a predetermined distance, for example, in front of the head of the user CU as shown in FIG. In this state, for example, when the user CU inputs the start of body temperature measurement by a predetermined operation (step S3-Y), ultrasonic waves are output from the piezoelectric vibrator 113 which is half of the parametric speaker 110 to the user CU. (Step S4).

  Then, the ultrasonic wave reflected by the user CU is input to the piezoelectric vibrator 113 which is half of the parametric speaker 110 (step S5). At this time, the reflectance of the ultrasonic wave reflected by the body temperature of the user CU changes.

  Therefore, the mobile phone 100 measures the body temperature of the user CU from the input ultrasonic reflectance (step S6). Then, one of the plurality of contents is retrieved corresponding to the measured body temperature (step S7), and displayed on the display unit 102 (step S8).

  For example, if the body temperature measured by the user CU is normal, a guidance message such as “Your body temperature is normal” is output to the display unit 102 as content.

  If the measured body temperature is slightly fever, for example, a guidance message such as “Your body temperature is slightly fever, please be careful” is output to the display unit 102 as content.

  If the measured body temperature is high fever, for example, a guidance message such as “Your body temperature is high fever, please consult your doctor immediately” is output to the display unit 102 as content.

  In the mobile phone 100 according to the present embodiment, the body temperature is measured by detecting the reflected ultrasonic wave output from the piezoelectric vibrator 113 of the parametric speaker 110 to the user as described above. The body temperature of the user can be measured using the piezoelectric vibrator 113 of the parametric speaker 110 to be used.

  And since the guidance message is displayed and output on the display unit 102 as content corresponding to the measured body temperature, the user CU can execute an appropriate treatment.

  Further, in the mobile phone 100 of the present embodiment, two microphones 121 and 122 are arranged in parallel. Therefore, it is possible to determine the position of the user from the input voice and control the output direction of the ultrasonic waves from the parametric speaker 110.

  Furthermore, in the mobile phone 100 according to the present embodiment, since the two microphones 121 and 122 are arranged in the left and right positions as described above, even when the user holds and uses the right hand, the left hand holds it. Even when it is used, it is possible to satisfactorily input the utterance of the user CU.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, an example is described in which ultrasonic waves are output from the half piezoelectric vibrator 113 of the parametric speaker 110 and ultrasonic waves are input to the other half piezoelectric vibrator 113.

  However, the ratio of the piezoelectric vibrator 113 that outputs such ultrasonic waves to the input piezoelectric vibrator 113 can be set in various ways. It is also possible to output ultrasonic waves from all the piezoelectric vibrators 113 of the parametric speaker 110 and detect the ultrasonic waves reflected by all the piezoelectric vibrators 113.

  Moreover, in the said form, corresponding to the measured body temperature, having illustrated selectively outputting the some content memorize | stored beforehand was illustrated. However, content corresponding to the measured body temperature may be selectively acquired from the outside and output.

  Further, in the above embodiment, the guidance message is output and displayed on the display unit 102 as the content. However, such a guidance message may be output as voice by the parametric speaker 110 or the electrodynamic speaker 140.

  In addition, since the mobile phone 100 that is the electronic device of the present embodiment communicates with an electronic device such as an external mobile phone, the measured body temperature may be transmitted to the external electronic device that is communicating.

  For example, when an elderly user CU regularly communicates with a hospital, the doctor can remotely recognize the body temperature of the user CU by measuring the body temperature and transmitting it to the hospital as described above. it can.

  Further, the mobile phone 100 may start communication with a predetermined electronic device corresponding to the measured body temperature. In this case, as described above, when the body temperature is determined to be high, the doctor can be automatically notified.

  Further, the mobile phone 100 may turn off the power supply in accordance with the measured body temperature. In this case, when the body temperature is determined to be high as described above, the mobile phone 100 is turned off, so that the user CU can be aware that he / she is hot.

  Further, in the above embodiment, the user CU intentionally measures the body temperature by a predetermined operation of the mobile phone 100. However, for example, the body temperature may be automatically measured during a call using the mobile phone 100, and a guidance message may be displayed and output when there is an abnormality.

  In the above embodiment, the parametric speaker 110 used for hands-free calling and the like and the parametric speaker 110 for measuring the body temperature are illustrated as being integrated. However, these may be separate dedicated bodies.

  Needless to say, the above-described plurality of embodiments and the plurality of modifications can be combined within a range in which the contents do not conflict with each other. In the above-described embodiment, the structure of each part has been specifically described. However, the structure and the like can be variously changed within a range that satisfies the present invention.

DESCRIPTION OF SYMBOLS 100 Mobile phone 101 Main body housing 102 Display unit 103 Keyboard unit 110 Parametric speaker 111 Piezoelectric element 112 Elastic member 113 Piezoelectric vibrator 114 Frame 115 Amplifier circuit 121,122 Microphone 130 Directivity control unit 140 Electrodynamic speaker CU User

Claims (10)

At least one piezoelectric vibrator having a piezoelectric element supported by an elastic member;
Output control means for outputting ultrasonic waves to the user from the piezoelectric vibrator;
Sound wave detecting means for detecting the ultrasonic wave reflected by the user;
A body temperature measuring means for measuring the body temperature of the user from the detection result of the ultrasound;
Electronic equipment having Having at least two of the piezoelectric vibrators;
The electronic apparatus according to claim 1, wherein the piezoelectric vibrator that outputs the ultrasonic wave to the user is different from the piezoelectric vibrator that receives the reflected ultrasonic wave.   The electronic apparatus according to claim 1, wherein the piezoelectric vibrator that outputs the ultrasonic wave to the user is also used as the piezoelectric vibrator that receives the reflected ultrasonic wave.   The electronic device according to any one of claims 1 to 3, further comprising content output means for outputting content corresponding to the measured body temperature.   The electronic device according to claim 4, wherein the content output unit stores a plurality of contents in advance and selectively outputs the content corresponding to the measured body temperature.   The electronic device according to claim 4, wherein the content output unit selectively acquires and outputs the content corresponding to the measured body temperature from the outside. An external communication means for communicating with an external electronic device;
The electronic device according to any one of claims 1 to 6, wherein the content output unit transmits content corresponding to the measured body temperature to the external electronic device in communication.   The electronic device according to any one of claims 1 to 7, further comprising power control means for cutting off the power when the measured body temperature is equal to or higher than a predetermined temperature.   The electronic device according to any one of claims 1 to 6, further comprising external communication means for starting communication with a predetermined electronic device when the measured body temperature is equal to or higher than a predetermined temperature.   2. A parametric speaker in which a plurality of the piezoelectric vibrators individually supporting a plurality of the piezoelectric elements by a plurality of elastic members are arranged in a matrix and the output direction of highly directional sound can be controlled. The electronic device according to any one of 9.

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