JP2002171341A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supplement the short use time of a portable telephone set by utilizing power generated by oscillating a vibrator during carriage by storing it in a capacitor. SOLUTION: By utilizing the character of piezoelectric materials and utilizing the oscillation of a piezoelectric element by means of the motion of a human body during carriage, electric energy can be taken out and utilized for the portable telephone set. Besides, this piezoelectric element is operated as a vibrator of a little power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone, which generates a stress in a piezoelectric element incorporated in the portable telephone by vibration of a human body, operates as a piezoelectric generator, and uses the energy as a battery energy of the portable telephone. In addition to being configured to be used as a replenishment source, a function of allowing the user to recognize an incoming call by forcibly vibrating the piezoelectric element is added.

[0002]

2. Description of the Related Art Conventionally, a lithium-ion battery or the like is used as an energy source for a portable telephone, but a few mW during standby.
Energy is required and its available time is relatively short, and when it is needed, the battery is already exhausted and often needs to be charged abruptly.

[0003] In a portable telephone, an incoming call is notified by sound or vibration. When the sound is emitted, it causes discomfort to the surrounding people and causes trouble, and therefore, a device that vibrates the mobile phone itself by the electromagnetic motor and notifies the human body of the incoming call is widely used.

[0004]

The time that can be actually used is short due to the relationship between the energy used for the mobile phone and the capacity of the lithium ion battery or the like that is the source of the power supply, and how to reduce energy consumption is a matter of design. This is an important issue.
Further, in a conventional device for notifying an incoming call by vibration, vibration is generated by rotating a weight whose eccentric center of gravity is rotated by a motor. When an electromagnetic motor is used to generate vibration in this manner, power consumption tends to increase.

Therefore, the present invention has been made to solve such a problem, and utilizes the swing of a piezoelectric ceramic element caused by the movement of a human body when carrying the portable telephone by utilizing the properties of the piezoelectric material. It is configured to extract electrical energy and use it on a mobile phone. In addition, the same piezoelectric ceramic element can be operated as a vibrator that consumes less power than an electromagnetic motor when supplied with power, and is effective in extending the talk time of a mobile phone. A piezoelectric vibrator replacing this electromagnetic motor is disclosed in, for example, Japanese Patent Application Laid-Open No. 09-17397.
9. It has already been proposed in JP-A-10-056498. However, in each case, the piezoelectric element is used as a source of vibration for the purpose of improving power consumption and electromagnetic noise, and the electric energy generated by the piezoelectric element oscillating due to external vibration is positively used. Not for use.

[0006]

According to the present invention, there is provided an incoming call notification and power generation device for a portable telephone, wherein an elastic strip 1 having one end 11 fixed to a case 4 of the portable telephone, and another end of the elastic strip 1 are provided. It comprises a weight 3 attached to 12, a piezoelectric ceramic 2 attached to the elastic strip 1, a diode circuit 5 for rectifying a current generated in the piezoelectric ceramic portion, and a capacitor 6 for storing electric energy. I have.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in a perspective view of FIG.
Reference numeral 11 denotes an elastic plate 1 such as stainless steel fixed to a case 4 of a mobile phone, a weight 3 attached to the other end 12 of the elastic plate 1, and a piezoelectric ceramic attached to the elastic plate 1. The vibrator 2 is used. It should be noted that a piezoelectric bimorph element in which two piezoelectric ceramic elements 2 and 2 ′ having opposite polarization directions are attached to both sides of the elastic body plate 1 may be used.

The piezoelectric bimorph element 2 is structurally a cantilever, and when the housing to which one end is fixed moves, the free end swings due to inertial force, so that electric charges are generated on the electrode surface. The current that can be taken out between the electrodes is supplied to the diode circuit 5.
When full-wave rectification is performed and the capacitor 6 is connected to the capacitor 6, charges are accumulated in the capacitor. The electric energy stored in the capacitor 6 is guided from the power supply system to the communication circuit side through an analog switch or the like according to an instruction of the control circuit, and can be used for the operation. Use of a small and large-capacity electric double layer capacitor as a capacitor is also advantageous for miniaturization.

When a sinusoidal AC voltage having the same low frequency as the mechanical resonance frequency inherent in the vibrating body configured as described above is applied to the piezoelectric bimorph element 2, the piezoelectric bimorph element 2 bends and vibrates, and the weight 3 Vibrates with a large amplitude, so that the telephone itself vibrates and the incoming call can be transmitted to the human body.

It is practically effective that the function of assisting the power supply with the electric energy generated by the piezoelectric element or the function of adding the vibrator function in addition to this function can be separated from the main body of the portable telephone as an external unit. is there.

[0011]

As is clear from the description based on the above embodiment, the power generated by the oscillation of the vibrator in the portable mode can be stored and used in the capacitor, and the portable telephone can be used for a short time. Can be covered.

Further, according to the incoming call notifying device of the present invention, since no electromagnetic motor is used, a portable telephone with low power consumption can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention incorporating a piezoelectric element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic body board 2 Piezoelectric ceramics 2 'piezoelectric ceramics board 3 Weight 4 Part of housing of mobile telephone 5 Diode circuit 6 Capacitor 7 Lead wire

Claims (4)

[Claims] 1. A piezoelectric element is built in a housing, and the piezoelectric element inside the housing is subjected to mechanical stress due to external vibrations when it is carried in a vehicle or inside a vehicle. A portable telephone characterized in that electricity is stored in a battery or a capacitor, and this electric energy can be used as auxiliary energy for a power supply battery. 2. A built-in piezoelectric bimorph element having one end fixed and a weight added to the other end, which can freely vibrate. The function of supplementing the electric energy used in the telephone by adding the electric energy generated between the electrodes due to the oscillation generated at the free end of the internal piezoelectric bimorph element to the secondary battery or the battery is added. The portable telephone according to claim 1, wherein: 3. A piezoelectric bimorph element having one end fixed and a weight added to the other end and capable of freely vibrating is incorporated in the housing, and the housing is externally moved when the user walks, moves or rides on the vehicle. The electric energy generated between the electrodes due to the oscillation generated at the free end of the internal piezoelectric bimorph element due to the vibration of When a call arrives, a function has been added to allow the user to recognize the incoming call by applying an electric signal matched to the resonance frequency of the piezoelectric bimorph element as necessary to the piezoelectric bimorph element and forcing the piezoelectric bimorph element to vibrate. Mobile phone. 4. A built-in piezoelectric bimorph element having one end fixed and a weight added to the other end and capable of freely vibrating, and a housing for preventing external vibration when a user walks, exercises, or rides on a vehicle. The function of supplementing the electric energy used in the telephone by storing the electric energy generated between the electrodes with the oscillation generated at the free end of the internal piezoelectric bimorph element in the battery or the storage device, or In addition to the function, when an incoming call arrives, a part that adds a function that allows the user to recognize the incoming call by applying an electric signal matched to the resonance frequency of the piezoelectric bimorph element to the vibrator as necessary and causing the piezoelectric bimorph element to forcibly vibrate A portable telephone as an external unit that can be freely attached to and detached from the housing.