JP2003224315A - Electrostatic generator, power unit, remote control, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic generation switching device, a power supply device, and electronic equipment that generate electric power with simple structures and can eliminate environmental burdens caused by disposable primary batteries by eliminating the need to use the batteries in electronic equipment or reducing the exhaustion of the batteries. <P>SOLUTION: In the electronic equipment provided with an electrostatic generation push button 4 composed of a piezoelectric material, stress is impressed upon the piezoelectric material of the section 4 so as to cause the material to generate an electromotive force by the piezoelectric effect exerted when the stress is impressed. Then the electronic equipment is operated by supplying the electromotive force to an electric circuit provided on a circuit board 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromotive device, a power supply device, a remote control device, and an electronic device, and more particularly to an electromotive device, a power supply device, a remote control device, and an electronic device using electromotive force due to a piezoelectric effect. It is related to equipment.

[0002]

2. Description of the Related Art Since the industrial revolution, the amount of fossil fuels used has been increasing, and environmental destruction due to combustion of fossil fuels and depletion of fossil fuels have become problems. Now that we are in the 21st century, how can we solve these problems?
This is a big issue for humanity in the future.

Under such circumstances, a technique for reducing the power consumption of electronic devices is advancing, but on the other hand, the number of the electronic devices is exponentially increasing. In particular, household electronic devices are required to have low power consumption in view of future demand.

Currently, primary batteries are used in many of these household electronic devices, and the amount of the primary batteries used is enormous. However, since most of these primary batteries are discarded after use, the environmental impact at that time is great. In addition, the trouble of replacing the battery when the primary battery runs out,
It has been pointed out that it is difficult to use due to the deterioration of the function of the primary battery just before it runs out.

Therefore, electronic devices having a built-in power generation function have been proposed. Until now, a remote control power supply device (Japanese Patent Laid-Open No. 2000-197310) capable of generating power by operating a lever and an electronic device equipped with a button capable of generating power using electromagnetic induction ( Japanese Unexamined Patent Publication No. 10-74426), a wireless remote control device (Japanese Unexamined Patent Publication No. 7-240968) that can reduce the frequency of battery replacement by using a solar battery and a primary battery together, and a rotary operation lever. There is proposed a radio receiver with a manual power generation function (Japanese Patent Laid-Open No. 11-75344) capable of generating power by rotating.

[0006]

However, it is difficult to realize any of the above-mentioned electronic devices as a product. This is because if the electronic device has the above-described power generation function, the structure of the electronic device becomes complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromotive device and a power supply device which do not complicate the structure, and a remote control device and an electronic device equipped with them.

[0008]

In order to achieve the above object, a first invention of the present invention is a piezoelectric film having elasticity in an electromotive device which generates an electromotive force in accordance with an operation of an electronic device. Alternatively, a plate made of a piezoelectric material is provided so as to be deformable, and an electromotive force generated by applying stress to the piezoelectric film or the plate made of the piezoelectric material is supplied to a load.

In the first aspect of the invention, the piezoelectric film is preferably made of a piezoelectric polymer material. Further, specifically, the piezoelectric polymer material is polyvinylidene fluoride.

In the first aspect of the invention, the piezoelectric material preferably contains lead zirconate titanate as a main component.

In the first aspect of the invention, preferably, the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except for a portion for supplying a load.

In the first aspect of the invention, it is preferable that a plurality of piezoelectric films or plates made of a piezoelectric material are laminated while maintaining their elasticity.

According to the first aspect of the present invention configured as described above, a plate made of an elastic piezoelectric film or a piezoelectric material is used in an electromotive device that generates an electromotive force when an electronic device is operated. In order to be deformable, the piezoelectric film or the piezoelectric material is deformed by applying stress to the piezoelectric film or the piezoelectric material plate, and the piezoelectric effect due to the deformation causes the piezoelectric film or the piezoelectric material plate to be deformed. Electric power is generated, and the generated electromotive force can be supplied to the load.

A second aspect of the present invention is provided with an elastic plate made of a piezoelectric film or a piezoelectric material so as to be deformable, and an electromotive force generated by applying stress to the piezoelectric film or the plate made of the piezoelectric material. It is characterized in that the load is supplied.

In the second invention, the piezoelectric film is preferably made of a piezoelectric polymer material. Further, specifically, the piezoelectric polymer material is polyvinylidene fluoride.

In the second aspect of the invention, it is preferable that the piezoelectric material contains lead zirconate titanate as a main component.

In the second aspect of the invention, preferably, the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except for a portion for supplying a load.

In the second aspect of the invention, preferably, the piezoelectric film or the plate made of a piezoelectric material is laminated with a plurality of plates while maintaining its elasticity.

In the second aspect of the invention, the load is typically a secondary battery.

According to the second aspect of the present invention configured as described above, since the elastic piezoelectric film or the plate made of the piezoelectric material is deformably provided, stress is applied to the piezoelectric film or the plate made of the piezoelectric material. When applied, the piezoelectric film or the piezoelectric material is deformed, and the piezoelectric effect due to the deformation generates an electromotive force in the plate made of the piezoelectric film or the piezoelectric material, and the generated electromotive force can be supplied to the load. it can.

A third aspect of the present invention is provided with a deformable plate made of a piezoelectric film or a piezoelectric material, and the plate made of the piezoelectric film or the piezoelectric material is operated in accordance with the operation of the controlled device. It is characterized by including an electromotive device that generates an electromotive force by applying stress to and a load that supplies the electromotive force.

In the third aspect of the invention, the piezoelectric film is preferably made of a piezoelectric polymer material. Further, specifically, the piezoelectric polymer material is polyvinylidene fluoride.

In the third aspect of the invention, the piezoelectric material preferably contains lead zirconate titanate as a main component.

In the third aspect of the invention, preferably, the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except for a supply portion for a load.

In the third aspect of the invention, preferably, a plurality of plates made of a piezoelectric film or a piezoelectric material are laminated while maintaining their elasticity.

In the third aspect of the invention, the load is typically a circuit device.

According to the third aspect of the present invention having the above-described structure, an elastic piezoelectric film or a plate made of a piezoelectric material is provided so as to be deformable, and the piezoelectric film is operated in accordance with the operation of the controlled device. Alternatively, since a plate made of a piezoelectric material is provided with an electromotive device that generates an electromotive force by applying stress and a load that supplies the electromotive force, the piezoelectric device or the plate made of a piezoelectric material is operated by operating the controlled device. Stress is applied, the piezoelectric film or material is deformed,
Due to the piezoelectric effect due to the deformation, electromotive force is generated in the piezoelectric film or the plate made of the piezoelectric material, and the generated electromotive force can be supplied to the load.

A fourth aspect of the present invention is that an elastic plate made of a piezoelectric film or a piezoelectric material is deformably provided, and stress is applied to the piezoelectric film or the plate made of a piezoelectric material to generate electromotive force. It is characterized in that it is provided with an electromotive device that generates an electromotive force and a load that supplies the electromotive force, and that the electromotive device is generated by pressing the electromotive device, and the electromotive force is supplied to the load.

In the fourth aspect of the invention, the piezoelectric film is preferably made of a piezoelectric polymer material. Further, specifically, the piezoelectric polymer material is polyvinylidene fluoride.

In the fourth aspect of the invention, preferably, the piezoelectric material contains lead zirconate titanate as a main component.

In the fourth aspect of the invention, preferably, the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except for a supply portion for a load.

In the fourth aspect of the present invention, preferably, the piezoelectric film or the plate made of the piezoelectric material is laminated with a plurality of plates while maintaining its elasticity.

In the fourth invention, typically, the load is a circuit device.

According to the fourth aspect of the present invention configured as described above, an elastic plate made of a piezoelectric film or a piezoelectric material is deformably provided, and a stress is applied to the piezoelectric film or the plate made of the piezoelectric material. Since it includes an electromotive device that generates an electromotive force by applying, and a load that supplies the electromotive force,
By pressing the electromotive device, stress is applied to the piezoelectric film or the plate made of the piezoelectric material, the piezoelectric film or the piezoelectric material is deformed, and the piezoelectric effect due to the deformation causes the piezoelectric film or the plate made of the piezoelectric material to be deformed. Electric power is generated, and the generated electromotive force can be supplied to the load.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a remote controller device (hereinafter, referred to as a first embodiment of the present invention.
It is a perspective view showing an example of the appearance of a remote control device). FIG. 2 is a perspective view showing an example of the configuration of the remote control device according to the first embodiment of the present invention.

As shown in FIG. 2, this remote controller 1
Is composed of a case 2, a circuit board 3, and an electromotive pressing portion 4. The case 2 is made of a material such as synthetic resin and has a recess 2a on its upper surface, and the circuit board 3 is housed in the recess 2a.

The circuit board 3 has a rectangular shape that can be stored in the recess 2a provided in the case 2 described above. A circuit device for controlling the remote control device 1 and the like is formed on the circuit board. The circuit device will be described later.

The electromotive pressing portion 4 is for generating power in accordance with the pressing or releasing operation. Specifically, it is for turning on / off a switch arranged under the electromotive pressing portion 4 and for generating power in accordance with the on / off operation. This electromotive pressing part 4
Is composed of a piezoelectric spring which is deformable by pressing and can be restored by releasing the pressing, and a button provided on the piezoelectric spring for pressing the piezoelectric spring.

The piezoelectric spring is constructed by laminating a piezoelectric film in a single layer or a plurality of layers. This piezoelectric film is a film made of a piezoelectric polymer material having elasticity and flexibility, for example, a film made of a material such as polyvinylidene fluoride (PVDF).

Further, the piezoelectric spring has at least one supply portion, and this supply portion is fixed on the circuit board 3 so that the piezoelectric spring can be deformed. The supply unit fixes the electromotive pressing unit 4 on the circuit board 3 and loads the electric power generated by the operation of pressing or releasing the electromotive pressing unit 4, specifically, the remote control device 1 It is for supplying to a circuit device formed on the circuit board 3. In addition,
The parts other than the supply part of the piezoelectric spring are coated with an insulating material. By performing such a coating process, it is possible to prevent the electric power generated by the piezoelectric spring from being discharged from other than the supply unit.

FIG. 3 is a perspective view showing an example of a concrete structure of the electromotive pressing portion 4 according to the first embodiment of the present invention. As shown in FIG. 3, the piezoelectric spring 5 has a convex shape in the pressing direction. Specifically, the piezoelectric spring 5 has a rectangular shape, and the central portion of the rectangular shape has a convex shape in the pressing direction. Further, a supply portion 5a is provided at each end of the piezoelectric spring 5 in the longitudinal direction.

FIG. 4 shows an enlarged sectional view of the supply portion 5a of the piezoelectric spring 5. As shown in FIG. 4, the input part 5c previously formed on the circuit board 3 and the above-mentioned supply part 5a are connected by, for example, solder. The input unit 5c is connected to, for example, a load such as a circuit device formed on a substrate described later. Further, a conductive plate 5b is attached to the opposite surface connected to the input section 5c, and a conductive wire is connected to the conductive plate 5b by, for example, soldering. And this conducting wire is grounded.

FIG. 5A is a sectional view of the electromotive pressing portion 4 when the button 6 is not pressed. FIG. 5B shows button 6
FIG. 6 is a cross-sectional view of the electromotive pressing portion 4 when is pressed.
As shown in FIGS. 5A and 5B, a switch 8 that is turned on / off by pressing a button 6 is arranged below the piezoelectric spring 5 of the electromotive pressing portion 4. 5A and 5A.
As shown in B, the switch 8 may be covered with a cover 7 made of an elastic body such as rubber. Note that the remote controller control unit, which will be described later, has
It detects which of the switches 8 included in the switch is in the ON state and transmits a signal according to the detection result to a controlled device such as an electronic device via a transmission unit described later.

As shown in FIG. 5B, when the button 6 is pressed, the shape of the piezoelectric spring 5 is deformed and a strain is applied to the piezoelectric spring 5, and an electromotive force is generated in the piezoelectric spring 5 by the piezoelectric effect due to the strain. To do. That is, when mechanical stress is applied to the piezoelectric spring 5, dielectric polarization occurs in the piezoelectric spring 5, and as a result, electric charges are generated on the surface of the piezoelectric spring 5. For example, positive charges are generated on the surface facing the circuit board 3, and negative charges are generated on the surface opposite to this surface. As a result, in the piezoelectric spring 5, a potential difference occurs between the surface facing the circuit board 3 and the surface opposite to this surface, and electromotive force is generated. Then, the generated electromotive force is supplied to a load, for example, a circuit device described later, via the supply unit 5a.

Also, when the pressing of the button 6 is released and the piezoelectric spring 5 returns to the state shown in FIG. 5A, electric charges are generated on the surface of the piezoelectric spring 5 as in the case of pressing the button 6. , And supplies electromotive force to the load via the supply unit 5a.

FIG. 6 is a block diagram showing an example of a circuit device provided in the remote controller 1. FIG. 6A is a block diagram of the power supply circuit device of the remote controller 1, and FIG.
FIG. 3 is a block diagram of a control system circuit device of the remote control device 1.

First, the power supply circuit device shown in FIG. 6A will be described. The power supply system circuit device provided in the remote control device 1 includes a piezoelectric spring 5 (piezoelectric springs 5 _{1 to} 5 _n ), a smoothing circuit 11, a storage circuit 12, a remote control circuit 13, and the like.

The piezoelectric spring 5 generates an electromotive force and supplies the electromotive force to the circuit device via the supply portion 5a, as described above, when the pressing or releasing operation is performed. The smoothing circuit 11 smoothes the pulsating flow from the piezoelectric spring 5 via the supply unit 5a to a state close to DC. This smoothing circuit 11
Is composed of, for example, a capacitor. Power storage circuit 12
Stores the supplied electric power. The storage circuit 12 includes a nickel-cadmium battery, a nickel-hydrogen battery,
A secondary battery such as a lithium-ion battery can be used. The remote controller circuit 13 includes a remote controller controller and a transmitter which will be described later. The piezoelectric spring 5 and the smoothing circuit 1
1, the power storage circuit 12 and the remote control circuit 13 are partially grounded so that the circuits operate normally.

The power supply circuit device provided in the remote control device 1 shown in FIG. 6A configured as described above operates as follows. When the electromotive force is generated, the piezoelectric spring 5 supplies the generated electromotive force to the smoothing circuit 11.
Then, the smoothing circuit 11 smoothes the supplied electromotive force to a state close to DC, and supplies the electromotive force to the power storage circuit 12. The power storage device 12 stores the supplied excess current and supplies stable power to the remote control circuit 13. As a result, the remote control circuit 13 operates.

Next, the control system circuit device shown in FIG. 6B will be described. The control system circuit device provided in the remote controller 1 is composed of a switch 8, a remote controller controller 13a, a transmitter 13b and the like.

The switch 8 has the button 6 as described above.
It is turned on / off by pressing. Remote controller 13a
Generates a remote control signal corresponding to the pressed button 6 when the switch 8 is on. Transmitter 13b
Uses the remote control signal generated by the remote control control unit 13a as a transmission signal such as an infrared remote control signal,
Transmit to controlled devices such as television receivers.

The control system circuit device provided in the remote controller 1 shown in FIG. 6B, which is configured as described above, operates as follows. The switch 8 supplies a control signal to the remote controller control unit 13a when the button 6 is pressed. The remote control control unit 13 a generates a remote control signal corresponding to the supplied control signal, that is, a remote control signal corresponding to the button 6 of the remote control device 1 that has been pressed, and supplies the remote control signal to the transmission unit 14. The transmitter 14 wirelessly transmits a transmission signal to the controlled device based on the supplied remote control signal.

Therefore, according to the remote control device 1 of the first embodiment, when the button 6 is pressed, the piezoelectric spring 5 is also pressed and the switch 8 is also pressed to be in the ON state. Therefore, by the operation described above, the transmission signal corresponding to the button 6 is transmitted to the controlled device, and the remote control is performed. When the button 6 is released, the switch 8 is turned off and the transmission of the transmission signal is completed.

Now, let us consider the power generation amount of the piezoelectric spring 5 and the power consumption of the remote controller 1 when polyvinylidene fluoride (PVDF) is used as the material of the piezoelectric spring 5.

The power consumption consumed by infrared communication in a general remote control device that is now widespread is about 30 mW. Therefore, when using polyvinylidene fluoride (PVDF) as the material of the piezoelectric spring 5, the force for pressing the button 6 and the distance for pressing the button 6, that is, the piezoelectric spring 5 so that the minimum value of the power generation amount is 30 mW or more. It is necessary to adjust the elastic force and the displacement amount of the piezoelectric spring 5.

For example, the force required to press the button 6 is 1N to 5N, and the moving distance of the button 6 is 5mm to 1m.
m, and the size of the button 6 in contact with the piezoelectric spring 5 is 1
Assuming that it is 0 mm x 10 mm square, press button 6 to 0.2
Press with s. The work rate W at this time is W = (1N to 5N)
X (0.005m-0.01m) /0.2s, that is, 25mW-250mW. here,
Since the electromechanical conversion efficiency of polyvinylidene fluoride (PVDF) is usually about 30% at maximum, assuming that the total mechanoelectric conversion efficiency at this button pressing is also about 30% at maximum, the power generation of about 75 mW at maximum is possible. Will be possible.

From the above consideration, if polyvinylidene fluoride (PVDF) is used as the material of the piezoelectric spring 5, the button 6
It is understood that it is possible to obtain sufficient power to operate the remote control device 1 by pressing.

The transmittable distance of a general remote controller is set to about 7 to 8 m. By configuring the circuit by setting the transmittable distance to be short, the power consumption of the remote control device is reduced in proportion to the shortened distance. Therefore, the power consumption consumed by the operation of the remote control device can be adjusted by changing the transmittable distance of the remote control device.

Next, the structure of the piezoelectric spring 5 will be considered. FIG. 7 is a diagram showing an example of a specific shape of the piezoelectric spring 5. The inventor of the present application measured the relationship between the film thickness and the load by using the film having the shape shown in FIG. 7. 7A is a top view and FIG. 7B is a side view. Figure 7
As shown in, the piezoelectric spring 5 has a length of 10 mm and a width of 33 mm.
mm and height 10 mm. The shape of the upper surface of the convex portion is 10 × 10 mm,
The width of each of the two supply portions 5a included in the piezoelectric spring 5 is 5 mm. Further, the two supply parts 5a are fixed.

For the measurement, the Young's modulus of polyvinylidene fluoride (PVDF) was used as the material of the piezoelectric spring 5 (2 to 3 GPa (N including the electrode and the protective film (insulating material)).
/ M ² )), Young's modulus of 3 GPa (N /
m ² ) polyethylene terephthalate (PET) film was used, and a spring balance was used to measure the load.

FIG. 8 shows the shape of the piezoelectric spring 5 when measured. FIG. 8A is a diagram before a load is applied (no load), and FIG. 8B is a diagram when a load is applied (load state). That is, in this measurement, the amount of load until the pressing portion of the film bends by 10 mm was measured.

Table 1 is a table summarizing the relationship between the film thickness and the load based on the measurement results, and FIG. 9 is a graph showing the relationship between the film thickness and the load based on the measurement results. The horizontal axis in FIG. 9 represents the film thickness [mm], and the vertical axis represents the load [N].

[0063]

[Table 1]

As shown in Table 1 and FIG. 9, it can be seen that the load increases in proportion to the film thickness. In this case, for example, to bend a film having a thickness of 0.4 mm, a load of about 3 N is applied. As a film of polyvinylidene fluoride (PVDF),
Since those having a thickness of 9 to 800 μm are generally mass-produced, when the piezoelectric spring 5 having a thickness of 0.4 mm is laminated, for example, if a film having a thickness of 0.028 mm is used, about 14 layers are formed. When a film having a thickness of 0.009 mm is used, the structure has about 45 layers.

As described above, according to the remote control device 1 according to the first embodiment, pressing the button 6 allows power generation work to be performed without being aware of it. This eliminates the need to use a primary battery. Therefore, it is possible to eliminate the troublesome battery replacement that would occur when only the primary battery is used, and the unstable operation immediately before the battery runs out. Therefore, the environmental impact of the disposal of the primary battery is reduced.

Further, since the piezoelectric film is used to generate power, the structure of the power generation section is not complicated and power generation can be performed with a simple structure. Moreover, the amount of power generation can be adjusted by changing the shape and structure of the piezoelectric spring 5.

Next, a second embodiment of the present invention will be described. FIG. 10 is a perspective view showing an example of the configuration of a remote control device according to the second embodiment of the present invention.

As shown in FIG. 10, this remote controller 2
1 includes a case 22, a circuit board 23, and an electromotive pressing portion 24. Since the case 22 and the circuit board 23 have the same configurations as those of the above-described first embodiment,
The description is omitted.

The electromotive pressing part 24 is for generating power in accordance with the pressing or releasing operation. Specifically, it is for turning on / off a switch arranged under the electromotive pressing portion 24 and for generating power in accordance with the on / off operation. The electromotive pressing portion 24 is deformable by pressing, and has a piezoelectric plate having elasticity that can be restored by releasing the pressing, and a plurality of buttons provided on the piezoelectric plate for pressing the piezoelectric plate. Composed of and.

The piezoelectric plate is formed by laminating a plate made of a piezoelectric material in a single layer or a plurality of layers. The elastic plate is made of a relatively hard piezoelectric material such as piezoelectric ceramic. Specifically, it is made of a piezoelectric material such as lead zirconate titanate (PZT).

The piezoelectric plate has at least one fixing portion, and this fixing portion is the case 22 or the circuit board 23.
The piezoelectric plate is fixed so that it can be deformed. Moreover, the piezoelectric plate includes at least one supply unit. This supply unit loads the electric power generated by the pressing or releasing operation of the electromotive pressing unit 24, specifically, the remote control device 21.
It is for supplying to the circuit device formed on the circuit board 23. The portions other than the supply portion of the piezoelectric plate are coated with an insulating material. By performing such a coating process, it is possible to prevent the electric power generated by the piezoelectric plate from being discharged from other than the supply unit.

FIG. 11 is a perspective view showing an example of a specific structure of the electromotive pressing portion 24 according to the second embodiment of the present invention. As shown in FIG. 11, the piezoelectric plate 25 has a plate surface shape perpendicular to the pressing direction. Specifically, the piezoelectric plate 25 is a rectangular flat plate, and at least one of the sides of the piezoelectric plate 25 is fixed to the case 22. A supply portion 25a is provided at one end of the piezoelectric plate 25 in the short side direction.

FIG. 12 shows the supply unit 25 of the piezoelectric plate 25.
The enlarged sectional view of a is shown. As shown in FIG. 12, the supply unit 2
A conductive plate 25c is attached to 5a, and a conductive wire is connected to the conductive plate 25c by, for example, soldering. The conductor wire is connected to the circuit device formed on the substrate. A conductive plate 25b is attached to the surface of the supply unit 25a opposite to the surface connected to the conductive plate 25c, and a conductive wire is also connected to this conductive plate 25b by, for example, soldering. And this conducting wire is grounded.

FIG. 13A is a sectional view of the electromotive pressing portion 24 when the button 26 is not pressed. FIG. 13B shows
FIG. 9 is a cross-sectional view of the electromotive pressing portion 24 when the button 26 is pressed. As shown in FIGS. 13A and 10B, a switch 28 that is turned on / off by pressing a button 26 is arranged below the piezoelectric plate 25 of the electromotive pressing portion 24. As shown in FIGS. 13A and 10B, the switch 28 has a cover 27 made of an elastic material such as rubber.
It may be covered by. The remote controller control unit, which will be described later, detects which of the switches 28 included in the remote control device 21 is in the ON state, and outputs a signal corresponding to the detection result via a transmitting unit, which will be described later. , To controlled devices such as electronic devices.

As shown in FIG. 13B, when the button 26 is pressed, the shape of the piezoelectric plate 25 is deformed, and the piezoelectric plate 25 is distorted.
Electromotive force is generated. That is, when mechanical stress is applied to the piezoelectric plate 25, dielectric polarization occurs in the piezoelectric plate 25, and as a result, electric charges are generated on the surface of the piezoelectric plate 25. For example, positive charges are generated on the surface facing the circuit board 23, and negative charges are generated on the surface opposite to this surface. Thereby, the piezoelectric plate 25
Then, a potential difference occurs between the surface facing the circuit board 23 and the surface opposite to this surface, and electromotive force is generated. Then, the generated electromotive force is supplied to a load, for example, a circuit device or the like via the supply unit 25a.

Also, when the pressing of the button 26 is released and the piezoelectric plate 25 returns to the state shown in FIG. 13A, charges are generated on the surface of the piezoelectric plate 25 as in the case of pressing the button 26. , And supplies electromotive force to the load via the supply unit 25a.

Also in this remote controller 21, the same circuit device as the remote controller 1 in the first embodiment, that is, the piezoelectric plate 25 (the voltage spring 5 in the first embodiment), the smoothing circuit, the storage circuit, and the remote controller circuit. (Remote controller control unit and transmission unit), a switch, and the like. First
In the second embodiment, the piezoelectric springs 5 are provided by the number of the buttons 6 (piezoelectric springs 5 _{1 to} 5 _n ), but in the second embodiment, the piezoelectric springs 5 correspond to the piezoelectric springs 5 of the first embodiment. The single piezoelectric plate 25 is used. The other circuit configuration is the same as that of the first embodiment, and thus the description is omitted.

Therefore, according to the remote control device 21 of the second embodiment, when the button 26 is pressed, the piezoelectric plate 25 is also pressed and the switch 28 is also pressed to be in the ON state. Therefore, by the above-described operation, the transmission signal corresponding to the button 26 is transmitted to the controlled device, and the remote control is performed. And
When the button 26 is released, the switch 28 is turned off and the transmission of the transmission signal is completed.

The power generation amount of the remote control device 21 is proportional to the area and strain amount of the piezoelectric plate 25. Therefore, increasing the area of the piezoelectric plate 25 increases the power generation efficiency. Further, when the piezoelectric plate 25 has a structure as shown in FIG. 10, the button 2 located near the fixed portion of the piezoelectric plate 25.
The amount of power generation is larger when the button 26 located farther than 6 is pressed. Therefore, when the remote control device 21 is operated without using the primary battery and the secondary battery together, it is sufficient for the remote control device 21 to operate even when the button 26 at the position where the power generation efficiency is weakest is pressed. The button 26 and the piezoelectric plate 25 are configured to be electric power.

As described above, according to the remote control device 21 of the second embodiment, by pressing the button 26, the power generation work can be performed without being aware of it. This eliminates the need to use a primary battery.
Therefore, it is possible to eliminate the troublesome battery replacement that would occur when only the primary battery is used, and the unstable operation immediately before the battery runs out. Therefore, the environmental impact of the disposal of the primary battery is reduced.

Further, since power is generated using a plate made of a piezoelectric material such as piezoelectric ceramic, the structure of the power generation section is not complicated and power generation with a simple structure is possible. Moreover, the amount of power generation can be adjusted by changing the shape and structure of the piezoelectric plate 25.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, the numerical values given in the above embodiments are merely examples, and different numerical values may be used if necessary.

Further, for example, in the above-described first embodiment, the electromotive pressing portion 4 is provided on the piezoelectric spring 5 and the piezoelectric spring 5 having a convex shape in the pressing direction. However, the electromotive pressing portion 4 is not limited to this example.
For example, the electromotive pressing unit may include at least one fixing member provided on the circuit board 3, a piezoelectric spring fixed to the fixing member, and a button provided on the piezoelectric spring. It doesn't matter.

Specifically, as shown in FIG. 14, a fixing member 29 provided on the circuit board 3, a piezoelectric spring 30 having one end fixed on the fixing member 29, and a piezoelectric spring 30 provided on the piezoelectric spring 30. The button 6 may be configured to be included. Further, as shown in FIG. 15, two fixing members 31a and 31b are provided on the circuit board 3, and the fixing member 31
One end of the piezoelectric spring 32 may be fixed to a and the other end of the piezoelectric spring 32 may be fixed to the fixing member 31b.

Further, for example, the piezoelectric film forming the piezoelectric spring 5 in the above-described first embodiment and the plate made of a piezoelectric material forming the piezoelectric plate 25 in the second embodiment have a single-layer structure. However, they may have a laminated structure of a plurality of sheets while maintaining elasticity. Figure 1
6 shows a diagram of an example of a piezoelectric film formed in a laminated structure. As shown in FIG. 16, the piezoelectric film 33 whose entire surface is coated with an insulating material has a laminated structure (a five-layer structure in FIG. 16). At this time, for example, both ends of each piezoelectric film 33 are configured to be conductive without coating as an electrode with an insulating material or the like, and a connecting portion capable of supplying an electromotive force to a load is formed by a conductive plate or a conductive wire. Set up. Thereby, the piezoelectric film 3
It is possible to improve the power generation efficiency as compared with the case where 3 is composed of a single layer.

Further, for example, in the above-described first embodiment, the conductive plate 5 on the side opposite to the circuit board 3 of the supply section 5a.
Although b is grounded, on the contrary, the circuit board 3 side may be grounded. Similarly, in the above-described second embodiment, the conductive plate 25b, which is the opposite side of the circuit board 23 of the supply unit 25a, is grounded, but the circuit board 23 side may be grounded in reverse.

Further, for example, in the above-described first embodiment, the switch 8 is used to detect the pressing of the button 6, but by using the electromotive force of the piezoelectric spring 5 directly as the switch signal on the circuit board 3, It is possible to detect the pressing of the button 6 without using the switch 8.

In addition, for example, the piezoelectric spring 5 in the first embodiment and the piezoelectric plate 25 in the second embodiment described above.
When the remote control devices 1 and 21 have a switch function like the switches 8 and 28, the number is not limited to the number shown in the embodiment.

Further, for example, the supply portion 25a in the second embodiment described above is provided at one end in the lateral direction of the piezoelectric plate 25, but it may be provided at any place as necessary.

Further, for example, in the circuit device according to the above-described first embodiment, the electromotive force generated by the piezoelectric material is supplied to the smoothing circuit 11. At this time, the electric power from the solar cell is also used. As a result, more stable power can be supplied to the remote control device 1.

Further, for example, in the circuit device according to the first embodiment described above, the generated electromotive force is supplied to the smoothing circuit 11, but before the smoothing circuit 11 is supplied, the current of the electromotive force is substantially constant. A rectifier circuit may be provided so as to have an amplitude.

Further, for example, in the circuit device according to the first embodiment described above, a secondary battery such as a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium-ion battery is used as a storage battery forming the power storage circuit 12. It is also possible to use a primary battery such as a dry battery instead of the secondary battery and use the electromotive force generated by the piezoelectric material together with the primary battery. As a result, the life of the primary battery can be extended. It is also possible to configure the power storage circuit 12 with only a circuit device such as a capacitor without using the primary battery and the secondary battery.

Further, for example, in the above-mentioned first and second embodiments, the electromotive force pressing portions 4 and 24 are provided in the remote control device as an electromotive device, and the transmission signal is transmitted to the controlled device. However, the present invention is not limited to this, and other remote control devices such as a wireless key of an automobile may be provided with the electromotive force pressing portions 4 and 24.

Further, for example, in the above-described first and second embodiments, the electromotive force pressing portions 4 and 24 are provided in the remote control device as an electromotive device, but the electromotive force is loaded in another electronic device. That is, it may be supplied to an electric circuit of an electronic device. For example, the electromotive force pressing units 4 and 24 are small power devices that generally use a primary battery, portable electronic devices that require a primary battery or a secondary battery, and a controller for a home game machine. The electromotive pressing portions 4 and 24 are provided at positions where the piezoelectric spring 5 and the piezoelectric plate 25 can be deformed by operating the piezoelectric spring 5 and the piezoelectric plate 25, for example. Specifically, it is provided directly below a push button of a portable information terminal, a mobile communication device, a portable game device, or the like, or a key top of a keyboard of a portable computer. As a result, electromotive force is generated in the piezoelectric spring 5 and the piezoelectric plate 25 when the push button is pressed or the keyboard is input, and the electromotive force can be supplied to the electric circuit.

Further, for example, in the electromotive pressing portions 4 and 24 in the above-mentioned first and second embodiments, stress is applied to the piezoelectric spring 5 and the piezoelectric plate 25, which are piezoelectric materials, by pressing the buttons 6 and 26. However, the electromotive force of various electronic devices is generated by applying stress to the piezoelectric material using everyday casual operation. A power supply device that supplies the load may be used.

For example, a piezoelectric material such as the piezoelectric spring 5 and the piezoelectric plate 25 is provided on the sole of the shoe, and the pressure applied to the shoe when walking and wearing the shoe is applied as a stress to the piezoelectric material, and an electromotive force is applied to the piezoelectric material. May be generated and the electromotive force thereof may be supplied to a load such as a circuit device included in the electronic device or a circuit device storing a secondary battery. Further, for example, the piezoelectric spring 5 and the piezoelectric plate 25
A piezoelectric material such as is provided on the stairs, and the pressure applied to the stairs when applying the stairs is applied to the piezoelectric material as stress.
An electromotive force may be generated in the piezoelectric material and the electromotive force may be supplied to a load such as a circuit device included in the electronic device or a circuit device that stores a secondary battery. Further, for example, a piezoelectric material such as the piezoelectric spring 5 and the piezoelectric plate 25 is provided on a chair, and the pressure applied to the chair when sitting on the chair is applied as stress to the piezoelectric material to generate an electromotive force in the piezoelectric material. The electromotive force may be supplied to a load such as a circuit device included in the electronic device or a circuit device that stores a secondary battery. In this way, by applying stress to the piezoelectric material by daily casual operation, electromotive force is generated, and the generated electromotive force can be applied to various loads.

Here, with respect to everyday casual operation,
The relationship between the force and energy obtained by the operation will be briefly described using a table. Table 2 shows the average required force [N] in various operations and its output (energy).
The relationship of [W] is shown.

[0099]

[Table 2]

That is, as shown in Table 2, when the button on the remote control device is pressed, the force of about 1.5 N is averaged to about 0.
Energy of about 0735 W can be taken out.
Therefore, when the piezoelectric material is provided under the button of this remote controller and the force of pressing the button is applied as a stress to the piezoelectric material to generate electromotive force in the piezoelectric material, the electromechanical conversion efficiency is 30%. Assuming that the button is pressed, a maximum power generation of about 22 mW is possible.

Also, for keyboard input, an average of 1
About 0.0098 W of energy can be extracted from the force of N. Therefore, when a piezoelectric material is provided under the key tops of this keyboard, and the force of key pressing is applied to the piezoelectric material as stress, the electromechanical conversion efficiency of the piezoelectric material is 30%. Assuming that, a maximum of about 2.94 mW can be generated by key input.

In addition, in stepping on shoes while walking, 6
About 60% of the weight of a person with 0 kgf (about 600 N)
About 1.176 W of energy can be extracted from the force of N. Therefore, it is assumed that a piezoelectric material is provided on the sole of the shoe, the pressure applied to the shoe during walking is applied as stress to the piezoelectric material, and the electromechanical conversion efficiency of the piezoelectric material is 30%. Then, a maximum of 352 mW of power can be generated by stepping on the shoes.

As for the grip force, about 4.9 W of energy can be extracted from the force of 100 N on average. Therefore, a piezoelectric material is provided in a grip portion such as a doorknob, and a gripping force when the grip portion is gripped is applied to the piezoelectric material as a stress, and electromechanical conversion efficiency is 30% when an electromotive force is generated in the piezoelectric material. Assuming that there is, it is possible to generate a maximum of about 1.47 W by gripping the grip portion once.

[0104]

As described above, according to the present invention, an elastic piezoelectric film or a plate made of a piezoelectric material can be deformed in an electromotive device that generates an electromotive force when an electronic device is operated. By providing stress to a piezoelectric film or a plate made of a piezoelectric material to generate an electromotive force and supply it to a load, an electromotive device without complicating the structure is provided. be able to.

Further, according to the present invention, a plate made of an elastic piezoelectric film or a piezoelectric material is provided so as to be deformable in accordance with the operation of the load generating device, and the plate made of the piezoelectric film or the piezoelectric material is provided. By supplying the electromotive force due to the application of the stress to the load, it is possible to provide a power supply device without complicating the structure.

Further, according to the present invention, an elastic plate made of a piezoelectric film or a piezoelectric material is provided so as to be deformable, and stress is applied to the piezoelectric film or the plate made of the piezoelectric material when the controlled device is operated. By providing the electromotive device that generates electromotive force when applied and the load that supplies electromotive force, it is possible to provide a remote control device that can generate power without complicating the structure.

Further, according to the present invention, an elastic plate made of a piezoelectric film or a piezoelectric material is provided so as to be deformable, and stress is applied to the piezoelectric film or the plate made of a piezoelectric material to generate an electromotive force. Equipped with an electromotive device and a load that supplies electromotive force, pressing the electromotive device generates electromotive force, and supplying the electromotive force to the load enables power generation without complicating the structure. It is possible to provide various electronic devices.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an external appearance of a remote control device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a configuration of a remote control device according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an example of a configuration of an electromotive pressing portion according to the first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a supply unit included in the piezoelectric spring according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the electromotive pressing portion when the button according to the first embodiment of the present invention is not pressed and when the button is pressed.

FIG. 6 is a block diagram showing an example of a circuit device provided in the remote control device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing an example of a specific shape of a piezoelectric spring used for measurement.

FIG. 8 is a diagram of a piezoelectric spring used for measurement before and after applying a load.

FIG. 9 is a diagram showing an example of the relationship between the thickness of the piezoelectric spring and the load based on the measurement results.

FIG. 10 is a perspective view showing an example of a configuration of a remote control device according to a second embodiment of the present invention.

FIG. 11 is a perspective view showing an example of the configuration of an electromotive pressing portion according to the second embodiment of the present invention.

FIG. 12 is an enlarged cross-sectional view of a supply unit included in a piezoelectric plate according to a second embodiment of the present invention.

FIG. 13 is a cross-sectional view of the electromotive pressing portion when the button according to the second embodiment of the present invention is not pressed and when it is pressed.

FIG. 14 is a cross-sectional view showing an example of a configuration of an electromotive pressing portion according to the first embodiment of the present invention, which includes a fixing member.

FIG. 15 is a cross-sectional view showing another example of the configuration of the electromotive pressing portion according to the first embodiment of the present invention including a fixing member.

FIG. 16 is an example of a cross section of laminated piezoelectric films.

[Explanation of symbols]

1, 21 ... Remote control device, 2, 22 ... Case,
3, 23 ... Circuit board, 4, 24 ... Electromotive pressing portion,
5, 30, 32 ... Piezoelectric spring, 5a, 25a ... Supply section, 5b, 25b, 25c ... Conductive plate, 5c ...
Input part, 6, 26 ... Button, 7, 27 ... Cover, 8, 28 ... Switch, 11 ... Smoothing circuit, 1
2 ... electricity storage circuit, 13 ... remote control circuit, 25 ...
-Piezoelectric plate, 29, 31a, 31b ... Fixing member, 33
... Piezoelectric film

Claims (27)

[Claims] 1. An electromotive device that generates an electromotive force in accordance with an operation of an electronic device, wherein an elastic plate made of a piezoelectric film or a piezoelectric material is deformably provided, and the plate is made of the piezoelectric film or the piezoelectric material. An electromotive device characterized in that an electromotive force generated by applying a stress to a plate is supplied to a load. 2. The electromotive device according to claim 1, wherein the piezoelectric film is made of a piezoelectric polymer material. 3. The electromotive device according to claim 2, wherein the piezoelectric polymer material is polyvinylidene fluoride. 4. The piezoelectric material contains lead zirconate titanate as a main component.
The described electromotive device. 5. The electromotive device according to claim 1, wherein the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except a portion for supplying the load. 6. The electromotive device according to claim 1, wherein the piezoelectric film or the plate made of a piezoelectric material is formed by laminating a plurality of plates while maintaining elasticity thereof. 7. An elastic plate made of a piezoelectric film or a piezoelectric material is provided so as to be deformable, and an electromotive force generated by applying stress to the piezoelectric film or the plate made of a piezoelectric material is supplied to a load. A power supply device characterized by the above. 8. The power supply device according to claim 7, wherein the piezoelectric film is made of a piezoelectric polymer material. 9. The power supply device according to claim 8, wherein the piezoelectric polymer material is polyvinylidene fluoride. 10. The power supply device according to claim 7, wherein the piezoelectric material contains lead zirconate titanate as a main component. 11. The power supply device according to claim 7, wherein the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except for a supply portion for the load. 12. The power supply device according to claim 7, wherein the piezoelectric film or the plate made of the piezoelectric material is formed by laminating a plurality of plates while maintaining the elasticity thereof. 13. The power supply device according to claim 7, wherein the load is a secondary battery. 14. An elastic plate made of a piezoelectric film or a piezoelectric material is provided so as to be deformable, and a stress is applied to the plate made of the piezoelectric film or the piezoelectric material as the controlled device is operated. A remote control device comprising: an electromotive device that generates electric power; and a load that supplies the electromotive force. 15. The remote control device according to claim 14, wherein the piezoelectric film is made of a piezoelectric polymer material. 16. The remote control device according to claim 15, wherein the piezoelectric polymer material is polyvinylidene fluoride. 17. The remote control device according to claim 14, wherein the piezoelectric material contains lead zirconate titanate as a main component. 18. The remote control device according to claim 14, wherein the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except a portion for supplying the load. 19. The remote control device according to claim 14, wherein the piezoelectric film or the plate made of the piezoelectric material is formed by stacking a plurality of plates while maintaining the elasticity thereof. 20. The remote control device according to claim 14, wherein the load is a circuit device. 21. An electromotive device which is provided with a resilient plate made of a piezoelectric film or a piezoelectric material so as to be deformable, and which applies electromotive force to the plate made of the piezoelectric film or the piezoelectric material to generate an electromotive force. An electronic device comprising: a load that supplies the electromotive force, wherein the electromotive force is generated by pressing the electromotive device, and the electromotive force is supplied to the load. 22. The electronic device according to claim 21, wherein the piezoelectric film is made of a piezoelectric polymer material. 23. The electronic device according to claim 22, wherein the piezoelectric polymer material is polyvinylidene fluoride. 24. The electronic device according to claim 21, wherein the piezoelectric material contains lead zirconate titanate as a main component. 25. The electronic device according to claim 21, wherein the piezoelectric film or the plate made of a piezoelectric material is entirely coated with an insulating material except a portion for supplying the load. 26. The electronic device according to claim 21, wherein the piezoelectric film or the plate made of a piezoelectric material is formed by laminating a plurality of plates while maintaining the elasticity thereof. 27. The electronic device according to claim 21, wherein the load is a circuit device.