JP2007312422A - Mobile electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mobile electronic apparatus having various functions such as for detecting mechanical energy to be added to an electronic device, for improving strength of the electronic device, etc. by a simple configuration. <P>SOLUTION: The mobile electronic apparatus according to the present invention comprises a piezoelectric element 1 to be deformed by inputted electrical energy and for converting to an electrical signal after detecting strain to be added from external, control device 2 for outputting a control signal responding to the electrical signal, and an electrical energy generating device 5 for supplying the electrical energy to the piezoelectric element 1 in response to the control signal, wherein the piezoelectric element 1 is mounted on a substrate 8, while the control device 2 is designed to control the electrical energy generating device 5 so as to generate a force to the piezoelectric element 1 in a direction opposite to a load when the electrical signal is inputted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable electronic device such as a mobile phone.

  Currently, devices of this type, for example, mobile phones, are rapidly spreading, and accordingly, the number of manufacturers responding to failures of mobile phone bodies is increasing. There are various causes of failure of a conventional mobile phone, and there are many cases of failure of the inside of the apparatus or the case due to an impact caused by deformation of the case, key press or dropping of the main body. FIG. 3 shows a configuration diagram of a cellular phone disclosed in Japanese Patent Laid-Open No. 11-225188 (Patent Document 1). The mobile phone main body is provided with an impact detector 20 having piezoelectric characteristics, thereby detecting an impact caused by dropping or the like. The impact detection voltage is compared by the comparator 21, and when a voltage equal to or higher than the set voltage is detected, the interrupt controller 22 is activated by the comparison output, and causes the CPU 23 to generate an interrupt. The CPU 23 controls the liquid crystal display controller 25 of the display unit to display that the liquid crystal 26 has been shocked. Further, the CPU 23 stores that the memory 24 has been shocked.

  FIG. 4 is an external perspective view showing a partially broken basic configuration of a mobile phone disclosed in Japanese Patent Laid-Open No. 11-191795 (Patent Document 2). The mobile phone 31 is mounted in the phone case instead of including individual parts (speakers, buzzers, vibrators) for generating voice, ringing sound, and vibration as in the case of a conventional phone. The telephone has a multi-function vibration actuator 30 that generates vibration by converting it into mechanical energy. The telephone multi-function vibration actuator 30 is controlled in frequency and waveform of an electrical input signal, and generates voice, ringing sound, and vibration that can be experienced through the housing.

JP 11-225188 A Japanese Patent Application Laid-Open No. 11-191795

  In the cellular phone disclosed in Japanese Patent Laid-Open No. 11-225188, a device such as an unbalance motor (or vibration motor) is required to notify an incoming call or the like by vibration, which increases the volume and weight. In the cellular phone disclosed in Japanese Patent Application Laid-Open No. 11-191795, the multifunctional vibration actuator 30 for a telephone can generate a vibration such as an incoming call, but cannot detect mechanical energy applied to the cellular phone body. . Further, in order to improve the strength of the mobile phone, the volume and weight are increased. In view of the above problems, an object of the present invention is to provide a portable electronic device having various functions such as detecting mechanical energy applied to an electronic device and improving the strength of the electronic device with a simple configuration. It is in.

  A portable electronic device according to the present invention includes a piezoelectric element that detects a strain applied from the outside and converts it into an electrical signal and deforms by input electrical energy, a control device that outputs a control signal corresponding to the electrical signal, and a piezoelectric device An electrical energy generating device that supplies electrical energy corresponding to the control signal to the element, the piezoelectric element is mounted on the substrate, and the control device applies a force to the piezoelectric element in a direction opposite to the load when the electrical signal is input. The electric energy generating device is controlled so as to be generated.

  According to the portable electronic device according to the present invention, mechanical energy applied to the substrate can be detected, or conversely, mechanical energy can be applied to the substrate. Further, when mechanical energy applied to the substrate on which the electronic component is mounted is detected, electric energy is generated and supplied to the piezoelectric element so that mechanical energy is generated in a direction to protect the substrate and the component mounted on the substrate. Since it did in this way, the intensity | strength of the components with which the said board | substrate and the said board | substrate were mounted | worn can be improved.

Embodiment 1 FIG.
FIG. 1 is a partial schematic configuration diagram showing a main part of a mobile phone according to Embodiment 1 of the present invention. Reference numeral 1 denotes a piezoelectric element provided at the upper part of the back surface of the casing, which detects mechanical energy and converts it into an electrical signal. A CPU 2 controls various internal devices. Reference numeral 3 denotes a storage device that stores an electrical signal from the CPU 2. Reference numeral 4 denotes a battery which functions as a DC power source. Reference numeral 5 denotes an electrical energy generator, which generates various electrical energy and supplies it to the piezoelectric element 1. Reference numeral 6 denotes a housing. The arrows in the figure indicate the flow of electrical signals and electrical energy.

  Next, the operation will be described. When mechanical energy such as strain is applied to the mobile phone body from the outside, the piezoelectric element 1 provided in the housing 6 detects this mechanical energy and converts it into an electrical signal. The converted electrical signal is output from the piezoelectric element 1 to the CPU 2, and the CPU 2 outputs a control signal corresponding to the input electrical signal to the electrical energy generator 5. The electric energy generator 5 generates various electric energy corresponding to the control signal input using the battery 4 as a DC power source, and outputs the electric energy to the piezoelectric element 1. The piezoelectric element 1 converts the input electrical energy and generates mechanical energy.

  Here, the electric energy generator 5 is controlled by the control signal of the CPU 2 to generate AC electric energy having the same frequency as the mechanical resonance frequency of the housing 6 and output it to the piezoelectric element 1. When the piezoelectric element 1 vibrates at the resonance frequency of the housing 6 to resonate the housing 6, vibration that can be experienced with a small amount of electric energy can be generated. Thereby, it can be notified by the vibration which can be experienced that the mechanical energy was added to the mobile phone main body from the outside.

  Further, when receiving a call signal from another telephone, the piezoelectric element 1 is vibrated by generating AC electric energy having the same frequency as the mechanical resonance frequency of the housing 6 and supplying it to the piezoelectric element 1. The case 6 can be resonated to generate vibrations that can be felt to notify the arrival of the incoming call. For this reason, parts, such as an unbalance motor which was conventionally required, become unnecessary, and the number of parts can be reduced.

  Furthermore, by generating electrical energy of the resonance frequency of the primary or plural orders of the housing 6 or the resonance frequency of various intermittent patterns and supplying it to the piezoelectric element 1, the resonance frequency and the intermittent pattern corresponding to the incoming party can be obtained. The piezoelectric element 1 may be vibrated to resonate the housing 6 to generate various vibrations that can be experienced.

  As another function, a signal indicating that the electrical signal converted by the piezoelectric element 1 has been output to the CPU 2 is output from the CPU 2 to the storage device 3, thereby storing the fact that mechanical energy has been applied to the mobile phone body. May be. Further, the absolute value of the load applied to the piezoelectric element 1 may be stored by outputting the electrical signal itself input to the CPU 2 to the storage device 3. By storing the absolute value of the load load, for example, when the mobile phone body is broken and repaired, the stored absolute value of the load load is taken out from the storage device 3, and the absolute value of the load load is calculated. The degree of mechanical energy applied to the telephone body can be evaluated, and it can be easily distinguished whether the cause of the telephone body failure is mechanical energy or other factors.

  Alternatively, the piezoelectric element 1 may be detected by the piezoelectric element 1 by causing the piezoelectric element 1 and the housing 6 to come into close contact with each other. The detected strain is converted into an electrical signal in the piezoelectric element 1 and output to the CPU 2. The CPU 2 performs arithmetic processing on the input electrical signal, converts it into temperature information, and outputs it to the storage device 3 for storage. By storing the temperature information, for example, when the mobile phone body is broken and repaired, the stored temperature information is taken out from the storage device 3, and the temperature rise of the phone body is detected from the temperature information. By evaluating the degree, it is possible to easily distinguish whether the cause of the failure of the telephone body is an increase in temperature or other factors.

  In FIG. 1, the piezoelectric element 1 is provided at the upper part of the back surface of the casing of the cellular phone. However, the piezoelectric element 1 is provided on the front or back of the casing 6 or when strain is applied on the top, bottom, left and right sides. Anywhere. As the piezoelectric element 1, when it is mechanically deformed, it is polarized to generate a potential difference, and a piezoelectric ceramic impact sensor, a direct bonding type sensor using a bimorph type vibrator bonded with a piezoelectric single crystal, or the like is used.

Embodiment 2. FIG.
FIG. 2 is a partial schematic configuration diagram showing a main part of the present invention, omitting the case and the electronic substrate of the mobile phone according to Embodiment 2 of the present invention. A piezoelectric element 1 detects mechanical energy and converts it into an electrical signal. A CPU 2 controls various internal devices. Reference numeral 4 denotes a battery which functions as a DC power source. Reference numeral 5 denotes an electrical energy generator, which generates various electrical energy and supplies it to the piezoelectric element 1. 7 is a key button, and 8 is a key button panel which is a kind of substrate. The piezoelectric element 1 is provided on the key button panel 8. The arrows in the figure indicate the flow of electrical signals and electrical energy.

  Next, the operation will be described. When mechanical energy, such as strain, is applied to the key button panel 8 and the parts attached to the key button panel 8, the piezoelectric element 1 provided on the key button panel 8 detects this mechanical energy and converts it into an electrical signal. To do. The converted electric signal is output from the piezoelectric element 1 to the CPU 2, and the CPU 2 outputs a control signal corresponding to the input electric signal to the electric energy generator 5. The electric energy generator 5 uses the battery 4 as a DC power supply, generates various electric energy corresponding to the input control signal, and outputs it to the piezoelectric element 1. The piezoelectric element 1 converts the input electrical energy and generates mechanical energy.

  Here, with respect to mechanical energy when the key button 7 is dropped or when the key button 7 is pressed, the electric energy generator 5 is controlled by the control signal of the CPU 2 and is attached to the key button panel 8 and the key button panel 8. Electric energy that generates a force in a direction to protect a component that is present, for example, in a direction opposite to the load, is generated and output to the piezoelectric element 1. Thereby, the strength of the parts attached to the key button panel 8 and the key button panel 8 can be improved.

  When mechanical energy exceeding a certain threshold is applied, the electrical energy generating device 5 is controlled by a control signal from the CPU 2 to generate AC electrical energy having the same frequency as the mechanical resonance frequency of the housing 6, thereby causing the piezoelectric element 1 to By supplying it, the piezoelectric element 1 may be vibrated to resonate the housing 6, and vibration that can be experienced may be generated to issue a warning.

  Further, in the same manner as in the first embodiment, by storing information on the distortion of the substrate of the mobile phone or storing information on the temperature of the substrate, for example, when the substrate is broken and repaired, It can be used to identify the cause.

  In FIG. 2, the piezoelectric element 1 is provided on the key button panel 8 which is a kind of substrate of the mobile phone, but the place where the piezoelectric element 1 is provided may be a substrate on which other electronic components of the mobile phone are mounted. It may be anywhere as long as distortion is applied to the front or back of the substrate, or from the top, bottom, left and right sides.

  Since the present invention is configured as described above, the following effects can be obtained.

  In portable electronic equipment with a piezoelectric element that detects mechanical energy applied from the outside and converts it into an electrical signal, an electrical energy generator that generates electrical energy to be supplied to the piezoelectric element is provided, and the electrical energy generator is controlled by the electrical signal. Thus, various functions can be provided with a simple configuration.

  In addition, since the piezoelectric element is mounted on the casing of the portable electronic device, it is possible to detect mechanical energy applied to the casing, or conversely, add mechanical energy to the casing.

  Furthermore, when mechanical energy applied from the outside is detected, the electrical energy generator generates AC electrical energy having the same frequency as the mechanical resonance frequency of the casing of the portable electronic device. It can be informed by vibration that can be experienced that energy has been added.

  Also, when receiving a call signal, the electrical energy generator generates AC electrical energy having the same frequency as the mechanical resonance frequency of the casing of the portable electronic device. I can let you know. For this reason, parts, such as an unbalance motor which was conventionally required, become unnecessary, and the number of parts can be reduced.

  Further, since the piezoelectric element is mounted on the substrate on which the electronic component is mounted, the mechanical energy applied to the substrate can be detected, or conversely, the mechanical energy can be applied to the substrate.

  Further, when mechanical energy applied to the substrate on which the electronic component is mounted is detected, electric energy is generated and supplied to the piezoelectric element so that mechanical energy is generated in a direction to protect the substrate and the component mounted on the substrate. Since it did in this way, the intensity | strength of the components with which the said board | substrate and the said board | substrate were mounted | worn can be improved.

  In addition, since it has a storage device that stores information on mechanical energy applied from the outside, when the portable electronic device itself fails and is repaired, whether the cause of the failure is mechanical energy or other factors It can be easily distinguished whether there is.

  Further, in a device having a storage device for storing information on mechanical energy applied from the outside, the mechanical energy is set as a distortion of the casing of the portable electronic device or the substrate on which the electronic component is mounted. Alternatively, it can be easily distinguished whether it is the strain of the substrate or other factors.

  In addition, in a device having a storage device that stores information on mechanical energy applied from the outside, since mechanical energy is used as temperature, it is easily distinguished whether the cause of the failure is temperature rise or other factors. be able to.

1 is a partial schematic configuration diagram of a mobile phone according to a first embodiment of the present invention. It is a partial schematic block diagram of the mobile phone according to Embodiment 2 of the present invention. It is a block diagram of the conventional mobile phone. It is an external appearance perspective view of the conventional mobile telephone.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Piezoelectric element, 2 CPU, 3 Memory | storage device, 4 Battery, 5 Electric energy generator, 6 Case, 7 Key button, 8 Key button panel

Claims (5)

Piezoelectric elements that detect externally applied strain, convert them into electrical signals, and deform by the input electrical energy,
A control device that outputs a control signal corresponding to the electrical signal;
An electrical energy generator for supplying electrical energy corresponding to the control signal to the piezoelectric element;
The piezoelectric element is mounted on a substrate,
The portable electronic device, wherein the control device controls the electric energy generation device so that a force is generated in the piezoelectric element in a direction opposite to a load when the electric signal is input. The portable electronic device according to claim 1, wherein the strain is caused by temperature. The portable electronic device according to claim 1, further comprising a storage device that stores information on strain applied from outside. The portable electronic device according to claim 2, further comprising a storage device that stores temperature information. With batteries,
2. The portable electronic device according to claim 1, wherein the electrical energy generation device supplies electrical energy corresponding to the control signal to the piezoelectric element using the battery as a DC power source.

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