JPH09211151A - Producing method of generator, portable equipment and piezoelectric body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a generator provided with a piezoelectric body generating power by displacement due to added force, which ensures sufficient power generation by the vibration of cars and by human motion and provide a portable electronic components using this generator. SOLUTION: A piezoelectric body 20 with a slim belt shape is formed in spiral shape and made containable inside a case 1. As the slim piezoelectric body 20 has a small spring constant and generates large displacement with a specific force F, the power generated by the displacement becomes large. Thus, by catching the movement of the wrist of user, a sufficient power is obtained and a power generator and portable components using an actually usable piezoelectric body can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator that generates electric power by using mechanical vibration, and particularly to a small size watch or the like.
The present invention relates to a power generation device and a mobile device using a piezoelectric body that can be mounted on a mobile device and efficiently convert energy generated in daily life into electric energy for use.

[0002]

2. Description of the Related Art Several methods of driving a portable electronic device such as a watch with a permanent power source instead of a button battery have been considered. For example, a timepiece using a solar cell is commercially available, and the timepiece can be permanently used without the need for battery replacement. Further, it has been devised to make a timepiece function using a piezoelectric element. For example, a technology for making a timepiece function by using a film-shaped piezoelectric element that vibrates in the thickness direction of a wristwatch body to generate electricity. Is the actual exploitation Sho 63-7
No. 2593. However, in a wristwatch using this piezoelectric element, a sufficient amount of power cannot be obtained unless the wrist on which the timepiece is mounted is violently vibrated in the thickness direction of the timepiece, and it is difficult for a general user to actually use it.

[0003]

In recent years, miniaturization of information processing devices and communication devices has progressed, and portable electronic device devices equipped with not only a clock but also various functions have been developed. All of these driving sources are batteries, and when the batteries run out, the operation stops. Therefore, in order to continuously receive the service of the portable device, it is necessary to prepare a spare battery or prevent the memory from evaporating when the battery is switched. Furthermore, in areas where small portable batteries cannot be purchased, or when it becomes difficult to obtain batteries due to disasters, these portable devices cannot be used. Also, as portable devices have become popular, the number of discarded batteries has increased,
The problem of handling these also arises.

The portable device using the above-mentioned piezoelectric element as a power generator does not have such a problem of battery consumption, and it is possible to provide a portable device which can keep running cost and can be used anytime and anywhere. However, as described above, it is difficult for a conventional portable device using a piezoelectric element to obtain a sufficient amount of power generation so that the portable device can actually be used.

Therefore, in the present invention, the kinetic energy generated by the user in daily activities such as arm movements or the kinetic energy in the environment where the device is installed, for example, energy such as rotation and vibration is efficiently used. It is an object of the present invention to provide a power generation device that uses a piezoelectric body that can be frequently used to generate power. In particular, it is possible to effectively utilize these low-energy densities in the natural world, to secure a sufficient amount of power generation without the user consciously waving their arms, and to generate a power generator that can operate portable devices sufficiently. The purpose is to provide a portable device. Then, it is an object of the present invention to provide a power generation device and a portable device that enable the portable device to be used anytime and anywhere, reduce the running cost for battery replacement, and solve problems such as battery disposal.

[0006]

When a spring having a spring constant k is deformed by a certain force F, the displacement x of the spring and the energy U are
It is expressed by the following formula.

F = k · x (1) U = 1/2 · k · x2 = 1/2 · F · x = 1/2 · F2 / k (2) Applied to the piezoelectric body The mechanical energy U is converted into the electrical energy E at the ratio of the electromechanical coupling coefficient (hereinafter, coupling coefficient) and output. This coupling coefficient represents the electro-mechanical conversion efficiency of the piezoelectric body and is represented by the square root of the ratio of the mechanical energy U and the converted electric energy E. The value of this coupling coefficient is almost constant depending on the propagation direction of the elastic wave and the direction of the voltage.For example, a mode in which the propagation direction of the elastic wave and the direction of the voltage used in many power generations are orthogonal, that is, the lateral effect is used. The generated power is about 10%. Therefore, in order to efficiently output the electric energy from the force F applied to the piezoelectric body, it is important to generate the mechanical energy U as large as possible. For that purpose, as can be seen from the equation (2), the spring It is desirable to increase the displacement x of the piezoelectric body due to the force F by using a piezoelectric body having a small constant.

Therefore, in the present invention, an elongated strip-shaped piezoelectric body is employed, and by displacing the piezoelectric body, a large amount of power generation generated by the force F can be obtained. Further, in order to easily store the elongated strip-shaped piezoelectric body and to easily apply a predetermined force to the piezoelectric body, a curved portion is provided in the longitudinal direction of the piezoelectric body to form a spiral shape, a coil shape, or an arc shape. It is molded into. That is, the power generation device of the present invention includes a strip-shaped piezoelectric body having at least one curved portion formed in the longitudinal direction, a conductor connected to at least a part of the surface of the piezoelectric strip, and a conductor connected to the conductor. And rectifying means.
Therefore, the piezoelectric body is formed into a spiral shape, a coil shape, an arc shape, or a combination thereof.

The piezoelectric body having such a shape can be formed only by the piezoelectric material layer, or by using a belt-shaped support body having at least one curved portion formed in the longitudinal direction, one or both of them can be used. It can also be formed by providing piezoelectric element layers on both sides. In addition, by stacking a plurality of piezoelectric element layers directly on the piezoelectric body or with a conductor sandwiched therebetween, the current or voltage of the electric power output from the piezoelectric body can be adjusted according to the usage environment of the power generator and the equipment on the consumption side. Can be set. Furthermore, by adopting a conductive material such as titanium or phosphor bronze as the support, the support can also be used as the conductor.

Further, in order to effectively capture a naturally occurring movement such as a movement of a human body or a vibration of a car to generate a force in the piezoelectric body, one end of the piezoelectric body is supported on a base, , It is desirable to add a weight to the other end. In addition, when the shape of the piezoelectric body or elasticity is imparted to the piezoelectric body by the support, the direction in which the piezoelectric body can expand and contract is made to substantially coincide with the direction of the acceleration applied to the piezoelectric body, so that the piezoelectric body with the force F is applied. The displacement of can be increased. In an environment in which the direction or magnitude of acceleration changes, it is desirable to set a direction in which the frequency of occurrence is high and the direction of large acceleration can expand and contract.

Further, one end, that is, the base end, in which a spiral spiral spring or a coil-shaped piezoelectric body is housed along the circumference, is rotated with respect to the other end, that is, the tip end on the supported side. In the piezoelectric body, when the turning motion is performed from the balanced neutral position, the direction in which the turning motion starts from the neutral position is preferably substantially the same as the acceleration direction. Further, it is also possible to displace the piezoelectric body by using a rotary weight that is supported by the base and rotates along a predetermined rotation surface. In a power generator equipped with a oscillating weight, by bending the curved portion of the piezoelectric body in a plane that is substantially parallel to the swivel plane of the oscillating weight, it is possible to accommodate a large amount of piezoelectric material that is displaced in a thin space. Becomes And
By supporting one end (base end) of the piezoelectric body on the base and displacing the other end (tip) with the turning motion of the rotary weight, efficient power generation can be achieved. The tip may be attached to the tip side of the rotary weight, or a speed increasing means may be provided to drive the tip by increasing the rotational movement of the rotary weight via a train wheel or the like.

In the power generator having the rotary weight, when the rotary weight is in a neutral state, it is desirable that the center of gravity of the rotary weight be positioned substantially perpendicular to the direction of acceleration with respect to the center of rotation of the rotary weight. As a result, when acceleration is applied, the rotary weight starts to turn in a direction substantially coincident with the direction of acceleration, and the acceleration can be used efficiently to generate electricity. When gravitational force is used as the acceleration, it is desirable that the center of gravity of the rotary weight, which is rotating in the vertical plane, be stationary in a direction horizontal to the center of rotation of the rotary weight.

Further, by providing a storage means for accumulating the current output from the rectification means of the power generator, a portable power supply device can be realized. Furthermore, by providing a processing device that performs processing with the electric power supplied from the power storage unit, it is possible to realize a portable device that is portable and can be continuously used anytime and anywhere. Further, by giving the piezoelectric body the ability to initially generate an open-ended voltage that is 1 to 7 times the specified voltage supplied to the processing device by the acceleration frequently applied to the power generation device, the power generation efficiency is improved. Can be improved.

Further, in a wrist-worn portable device having a thin case for accommodating a power generator and mounted on the wrist, a rotary weight is provided so as to rotate in the case, and the case is almost the same. When horizontal, it is desirable to set the center of gravity of the rotary weight at a position between 90 degrees and 180 degrees from the direction of the middle finger of the case toward the thumb. In a portable device such as a watch worn on the outside of the left wrist, when the direction of the middle finger is set to 3 o'clock, it is desirable to set the center of gravity of the rotary weight to a position between 6 o'clock and 9 o'clock. . In the case of a device worn on the wrist, the 3 o'clock direction often goes downward when the user is standing, and the 12 o'clock direction often goes downward when the user is sitting.
Therefore, when the rotary weight is not affected by gravity, for example, when the back of the hand faces the horizontal direction,
When it is in the time direction, the rotating weight always rotates when the 3 o'clock direction or the 12 o'clock direction faces downward. Therefore, the piezoelectric body is efficiently deformed with the movement of the wrist, and a sufficient amount of power generation can be obtained without the user consciously moving the hand or body.

On the other hand, when the case is set vertically downward in the direction of 45 degrees from the direction of the middle finger toward the little finger (the direction at 1:30 in the above-mentioned device worn on the left wrist),
The center of gravity of the rotary weight is from 0 to 90 degrees from the direction of the middle finger of the case to the thumb (from 3 o'clock to 6 o'clock) or from 90 degrees to 1 from the direction of the middle finger of the case to the little finger.
It is desirable to be located anywhere between 80 degrees (9 o'clock to 12 o'clock). As an example of a device worn on the left wrist, when the direction at 1:30 is down, 3
When the center of gravity of the rotary spindle is between the time direction and the 6 o'clock direction, or between the 9 o'clock direction and the 12 o'clock direction, the direction of acceleration due to hand movement, vibration, etc. coincides with the direction in which the rotary spindle starts turning. Therefore, the movement of the wrist and the movement of the human body can be efficiently captured, and a sufficient amount of power generation can be secured even with a small movement.

A piezoelectric body having a curved portion suitable for such a power generator or a portable device has a step of forming a film on a green sheet by using a powder of piezoelectric ceramic, and a film material which burns this green sheet. And the process of wrapping with sandwiching,
A mass production can be easily performed by a manufacturing method characterized in that it has a step of sintering the wound green sheets. Further, by cutting the sintered piezoelectric body perpendicularly to the axial direction, a piezoelectric body having a narrow width can be obtained. Further, mass production can be further achieved by alternately sandwiching and winding a plurality of green sheets and a burnable film material.

Further, in the piezoelectric body provided with the support,
By hydrothermally treating at least the curved portion of the support in a mixed solution containing the composition of the piezoelectric body, the piezoelectric element layer can be easily formed on the curved portion. Further, the support is made of titanium, or the surface of the support is selectively formed of titanium, so that the work such as providing the piezoelectric element layer except the tip end where the weight is mounted can be easily performed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings.

[Embodiment 1] FIG. 1 shows an outline of a portable device having a wristwatch provided with a power generator according to Embodiment 1 of the present invention. The portable device 10 of the present example has a power generation unit 8 including a piezoelectric body 20 housed inside a case 1 and a rectifier circuit 2 that rectifies an alternating current obtained from the piezoelectric body 20. Further, it is provided with a power storage circuit 4 that stores the direct current output from the power generation unit 8 and a processing device 6 that performs a time counting process with the electric power supplied via the power storage circuit 4.
The processing device 6 may of course have a function of a radio, a pager or a personal computer in addition to the time counting process such as driving the clock unit 7 or performing an alarm process. Further, in this example, the capacitor 5 is used for the power storage circuit 4, but any device having a power storage capacity such as a secondary battery may be used. The rectifier circuit 2 has a diode 3 as in this example.
It is not limited to the full-wave rectification using, and may be a half-wave rectification circuit or a rectification circuit using an inverter or the like. In FIG. 1, a portable device having a wristwatch function of this example is shown using a conceptual diagram, but the rectifier circuit 2, the storage circuit 4, the processing device 6 and the like overlap in plan view with a rotary weight 13 and the like which will be described later. As described above, it is arranged inside the case 1, and the overall size of the device is reduced. Further, the portable device 10 of the present example is provided with the bands 18 for fitting on the upper and lower parts of the case 1 in the drawing, and controls the processing device 6 between these bands, or mechanically sets the time. A crown 19 for correcting the is provided. In the portable device 10 of this example, the crown 19 faces the direction of the middle finger when mounted so as to be positioned outside the left wrist, and is provided at a position indicating the 3 o'clock direction. Therefore, with respect to the direction of the middle finger, the position of 90 degrees on the little finger side is the 12 o'clock direction, and the position of 90 degrees on the thumb side from the direction of the middle finger is the 6 o'clock direction. The direction opposite to the crown 19 is the 9 o'clock direction. The position of the crown 19 is not limited to this example, and it is of course possible to provide it in the direction of 4 o'clock or the like.

The power generation section 8 of the portable device 10 of this embodiment uses a bimorph type piezoelectric body 20 formed in an elongated strip shape, and this piezoelectric body 20 is spirally arranged inside the case 1 like a spiral spring. It is rolled and stored. As shown in FIG. 2, the piezoelectric body 20 of this example is a strip-shaped ceramic,
For example, the shim material 25 is formed by applying a metal paste to both sides of zirconia to make them conductive, and two piezoelectric element layers 26a and 26b made of lead zirconate titanate (PZT) are formed on both sides. I am doing it. Electrodes 27a and 27b made of aluminum or the like are formed on the surfaces of the piezoelectric element layers 26a and 26b,
Each of the piezoelectric element layers 26a and 26b has a shim material 2
5 to the electrodes 27a and 27b. The piezoelectric body 20 incorporated in the case 1 in a spiral shape expands and contracts in conjunction with the movement of the rotary weight 13 described later, and is displaced in the direction of arrow A. Therefore, an elastic wave in the opposite direction is generated in the piezoelectric element layers 26a and 26b in the direction of the arrow B, which causes the piezoelectric element layers 26a and 26b.
An electromotive force is generated in the polarization direction of 6b. Therefore, in the piezoelectric body 20 of this example, the two piezoelectric element layers 26a and 26a
6b is connected in series, and current can be taken out by connecting the electrodes 27a and 27b to the rectifier circuit 2 described above.

Since the piezoelectric body 20 of this example is formed in a strip shape, it has a small spring constant and a large displacement x generated by the applied force F. Therefore, the above equation (1)
As described in (2) and (2), a large amount of mechanical energy can be stored in the piezoelectric body 20, and as a result, the power generation capacity of the piezoelectric body 20 can be significantly improved. In addition, the piezoelectric body 20 of this example
Is spirally curved, the piezoelectric body 20 having a sufficient length can be housed inside the case 1, and the displacement x can be set large even with a small spring constant. Therefore, sufficient power can be generated by coping with the force F generated by the rotating mass 13 having a large mass. Furthermore, since the spring constant is small, the period in which the oscillating weight 13 vibrates is long, the time for applying a sufficient displacement to the piezoelectric body 20 can be secured, and efficient power generation can be achieved.

Further, since the piezoelectric body 20 of this example is elongated and has the electrodes 27a and 27b formed on both side surfaces, a large capacitance can be secured and a high current output can be obtained. Since the two piezoelectric element layers 26a and 26b are connected in series, a sufficiently high electromotive voltage can be secured.

Returning to FIG. 1, in order to displace such a piezoelectric body 20, in the power generation section 8 of the present example, a rotary weight that swivels inside the case 1 with the substantially center of the case 1 as the swivel center 13b. The oscillating weight 13 has a rotary motion in a plane substantially parallel to the main body piezoelectric body 20. Therefore, when the portable device 10 of this example as a wristwatch is mounted on the user's wrist, the rotary weight 13 turns in conjunction with the movement of the user's arm or body, and the piezoelectric force 20 is utilized by utilizing the force. The displacement can be given to.

As shown in FIG. 3, the piezoelectric body 20 of this example is
The piezoelectric body 20 is displaced so as to be displaced by the movement of the rotary weight 13.
One end (tip) 21 is a plastic rivet 1
It is attached to the peripheral portion 13 a of the rotary weight 13 by means of 4. In this example, first, the rivet 14 made of plastic is fitted into the rotary weight 13 in the peripheral portion 13a, and the tip 21 of the piezoelectric body 20 is fitted into the groove 14b provided in the head portion 14a of the rivet 14 so that the piezoelectric body 20 is formed. The front end 21 of the is fixed to the rotary weight 13.

On the other hand, as shown in FIG. 4, the other end (base end) 22 of the piezoelectric body 20 is attached to the main plate 1a integrated with the case 1 (FIG. 1). In this example, the main plate 1
An insulating substrate 15 having two electrodes 16a and 16b formed thereon is fixed to a.
Electrodes 27a and 27b formed on both side surfaces of the piezoelectric body 20 are attached to b by solder 17. Therefore,
The solder 17 connects the other end 22 of the piezoelectric body 20 to the insulating substrate 15
The function of fixing to the main plate 1a via, and connecting the electrodes 27a and 27b to the electrodes 16a and 16b, respectively,
It fulfills both functions of extracting electric power from the piezoelectric body 20 and supplying it to the rectifier circuit 2.

Returning to FIG. 1, this figure shows a state in which the case 1 attached to the wrist by the band 18 is kept horizontal. In this state, gravity does not act on the rotary weight 13, and the mainspring-shaped piezoelectric body 20 is in a state in which it is not affected by the natural length, that is, acceleration. In this state, the piezoelectric body 20 of the present example has the center of gravity 13 of the oscillating weight 13.
It is set so that c is in the range of 90 to 180 degrees from the direction of the middle finger of the case 1 to the thumb. Therefore, in the portable device 10 of this example, the user can
When working on a desk or standing and walking with 0 attached to the arm, the rotary weight 13 always receives gravity to turn. Therefore, the piezoelectric body 20 is displaced by the movement of the user and electric power can be obtained from the power generation device 8.

As shown in FIG. 5, the portable device 10 of this example.
When the user wearing the is working on the desk, the direction rotated 90 degrees from the direction of the middle finger to the little finger, that is,
In the case of the above-described device worn on the left wrist, the 12 o'clock direction is most often vertically downward. Further, as shown in FIG. 6, when the user stands up or walks normally, the frequency of the middle finger of the case 1 is the most downward in the vertical direction. On the other hand, the portable device 10 of this example has a case 1
The center of gravity 13 of the rotary weight 13
c is set between 6 o'clock and 9 o'clock. Therefore,
The user returns his wrist to do the desk work,
Alternatively, when the user stands up and extends his / her hand downward for the purpose of movement, the center of gravity 13c of the oscillating weight swivels vertically downward from a position balanced on the horizontal plane. The direction from 6 o'clock to 9 o'clock when the center of gravity 13c of the oscillating weight is balanced on the horizontal plane is the farthest region from the direction of the case that is vertically downward when performing deskwork or walking. Therefore, when the user moves his or her hand, the rotary weight 13 starts the turning motion in almost any case, and the turning angular range of the rotary weight 13 at that time is very large. Due to the turning motion of the rotary weight 13, the elongated piezoelectric body 20 is largely displaced, and as a result, a large electric power is obtained from the piezoelectric body 20. Further, since the oscillating weight 13 vibrates around the neutral position of the gravity and the spring force applied to the oscillating weight 13, displacement is repeatedly applied to the piezoelectric body 20 by this turning motion, and power generation is continued.

When the user returns his or her wrist to the original position and the case 1 becomes horizontal, the piezoelectric body 20 returns to the natural length at the position balanced in the horizontal plane. Therefore, the center of gravity 13c of the rotary weight 13 also returns to its original position between the 6 o'clock and 9 o'clock directions.
Therefore, the oscillating weight 13 makes a revolving motion again, the displacement is given to the piezoelectric body 20 by this revolving motion, and power generation is performed again. Even in this case, since the rotary weight 13 vibrates around the position where the piezoelectric body 20 has a natural length, the piezoelectric body 20 continuously generates power.

As described above, the power generator 8 of the present example analyzes the movement of the user's wrist, the occurrence frequency is high, and
The balance position in the horizontal plane of the rotary weight 13 is set at a position where power can be efficiently generated. Therefore, the power generation device 8 of the present example performs deskwork in a normal operation, or generates power by the daily movement of the user standing up and walking, without being aware of whether or not the user is generating power. Sufficient power is available to operate the mold equipment. As described above, in the portable device of this example, power is generated by the user's daily movements, and the power can be used to operate the processing unit of the portable device or store the generated power. Therefore, the portable device of this example can operate without a battery, or the life of the battery can be significantly extended. Therefore, it is not necessary to replace the battery, the running cost can be reduced, and the cause of problems such as battery disposal can be eliminated. Further, the portable device can be used even in an area where it is difficult to obtain a battery or at the time of a disaster, so that the portable device can be used anytime and anywhere.

Further, as shown in FIG. 7, in the power generator 8 of the portable device 10 of this example, when the vertical direction is 45 degrees downward from the direction of the middle finger of the case 1 toward the little finger, the rotary weight is rotated. In a state in which 13 is stationary and balanced with the piezoelectric body 20, the neutral position of the center of gravity 13c of the rotary weight 13 is 0 to 90 degrees from the direction of the middle finger toward the thumb,
Or 90 degrees to 18 from the direction of the middle finger to the little finger
The mass of the oscillating weight 13 and the piezoelectric body 20 are adjusted so that the range is 0 degree.
The spring constant and the mounting position of are controlled. For portable devices worn on the left wrist, case 1 at 3
When the movement of the rotary weight 13 is stabilized with the direction of 0 minute facing downward, when the center of gravity 13c of the rotary weight 13 is between 3:00 and 6:00,
Alternatively, it is set between 9:00 and 12:00.

In a portable device worn on the wrist,
As described above, the frequency of going down at 3 o'clock or 12 o'clock is very high. Then, in these states, the wrist moves due to walking or desk work, and the acceleration changes due to the movement, so that the rotary weight 13 turns. The piezoelectric body 20 is displaced by the turning motion of the rotary weight 13,
Power is generated. In order to move the weight with good response in response to the change in acceleration, it is desirable to set the mass of the weight and the elastic force of the piezoelectric body 20 so that the changing direction of the acceleration and the moving direction of the weight coincide with each other. . Therefore, in the power generation device 8 of the present example, 1:00, which is between 3:00 and 12:00,
When the 0 minute position is set vertically downward, the rotary weight 13
The center of gravity 13c is set so that the line connecting the turning center 13b and the center of gravity 13c is orthogonal to the direction of the gravity G. Therefore, when the vertical acceleration changes from the gravity G due to the user's daily activities such as vibration when walking or hand shaking, the rotation weight 1 changes in the direction of the acceleration.
3 coincides with the starting direction of the turning movement. Therefore, the change in the force F applied to the oscillating weight causes the oscillating weight 13 to start the motion with good response, and smoothly perform the turning motion. Since the displacement applied to the piezoelectric body 20 is large, sufficient electric power is generated. As described above, in the portable device of this example, the rotary weight 13 moves greatly in response to the movement of the user with good response. Therefore, even a user with a small amount of exercise or a user with a slow movement can secure a sufficient amount of power generation, and the portable device of this example can be powered by a power generator using a piezoelectric body for anyone regardless of age or sex. You can enjoy the services of mobile devices.

FIG. 8 shows a portable device that is worn on the wrist as described above, and in a device that displaces a piezoelectric body formed in a spring shape by a rotary weight, the torque of the rotary weight and the spring shape are formed. It shows how the torque of the piezoelectric body is changed. A solid line A in FIG. 8 shows a change in torque of the spring of the piezoelectric body formed in a spiral shape, and when the portable device is installed horizontally, the center 13c of the rotary weight is balanced at the position of 7:30. , The counterclockwise direction is shown as positive. Further, the broken line B, the alternate long and short dash line C, and the alternate long and two short dashes line D in FIG. 8 show changes in the torque generated by the rotary weight 13. The broken line B occurs at the respective turning angle positions when the 12 o'clock direction is vertically downward, that is, when the rotary weight 13 turns with the wrist with the portable device placed horizontally with the little finger down. The change in torque is shown as positive clockwise. The alternate long and short dash line C indicates the change in the torque of the rotary spindle when the direction at 1:30 is downward, and the alternate long and short dash line D indicates the downward direction at 3 o'clock.

As can be seen from FIG. 8, the spring composed of the rotary weight 13 and the piezoelectric body 20 of this example has the positions P and 10 at 4:30 which are horizontal when the direction at 1:30 is downward. It is set to balance at position Q at 30 minutes. Therefore, as described above, it is easy to cause the piezoelectric body 20 to be displaced by the user's daily activities such as the vibration when walking or the shaking of the hand.
Further, when the 12 o'clock direction is down, the rotary weight 13 is stable at the position V of approximately 10 o'clock, and when the 3 o'clock direction is downward, the rotary weight 13 is stable at the position W of approximately 5 o'clock. Therefore, in the portable device of this example, when the wrist is moved to move the portable device to the 3 o'clock direction, the 12 o'clock direction, and further the 3 o'clock direction, the rotary weight 13 is at the 7:30 position. A large amount of energy can be taken out from the motion of the user's arm by turning in a range of 150 degrees or more around O. As described above, by setting the balance position in the horizontal state at 7:30 in the range from 6:00 to 9:00, it is understood that energy can be extracted and power can be generated very efficiently from the operation of the user. .

FIG. 9 shows the movement of the rotary weight 13 when the acceleration is changed by using a part of the diagram shown in FIG. 8, for example, when the acceleration is changed by moving the arm up and down. It is shown. For example, when the portable device is moved up and down with the direction of 3 o'clock facing downward, the torque of the rotary weight 13 changes as shown by the broken line. Therefore, the oscillating weight 13 moves between the positions W and W'on the solid line A indicating the torque of the spring, and the fluctuation of this position is added as a displacement to the piezoelectric body 20 to generate electric power.

As explained based on the equations (1) and (2), in order to effectively utilize the small force F to obtain a large amount of power generation, it is necessary to secure the amount of displacement of the piezoelectric body. There is. For example, in a power generator using a film-type piezoelectric material as disclosed in Japanese Utility Model Laid-Open No. 63-72593, when a large displacement is to be ensured, the portable device mounted on the wrist is displaced in the vertical direction. It becomes necessary to secure a space for Therefore, the thickness of the portable device is increased, and it cannot be realized in the portable device which needs to be small and lightweight. On the other hand, the power generator 8 of the portable device of this example
Uses a long piezoelectric body 20 wound in a spiral shape, the piezoelectric body 20 can be mounted in a thin and narrow space, and a large displacement can be generated by a small force F. Therefore, as described above, a large displacement can be generated by the movement of the user's arm, and it is possible to provide a power generation device that is small in size and lightweight but has a large power generation amount.

Further, in the power generator using the piezoelectric body, the electric energy generated by the displacement of the piezoelectric body when not charged is only the electromechanical coupling coefficient. That is, if any piezoelectric body has the same electromechanical coupling coefficient, the same electric energy is generated for the same input energy. However, the electric energy stored in a storage circuit such as a capacitor by charging becomes a function of the electromechanical coupling coefficient, the electromotive voltage of the piezoelectric element, the electrostatic capacity, and the voltage of the storage circuit such as the capacitor. For example, charging is not possible even if a power generator having a large capacitance and an electromotive voltage lower than the voltage of the power storage circuit is used. On the other hand, when using a power generator having an electrostatic capacity that is extremely close to 0 and an electromotive voltage that is nearly infinite, the amount of charge is small because almost no electric charge is generated, and it cannot be charged in reality. Therefore, it is important to find the most suitable electromotive voltage and electrostatic capacity for charging between these conditions.

According to the experiments and studies by the inventors of the present application, when the piezoelectric body is displaced, the maximum charge amount is obtained when the electromotive voltage (open circuit voltage) of the power generator is twice the supply voltage (specified voltage) of the storage circuit. Has been found to grow. And
The change in charging efficiency η with respect to the ratio of the open circuit voltage and the specified voltage is as shown in FIG. As can be seen from this figure, when the initial electromotive voltage (open circuit voltage) is about 1 to 7 times the specified voltage, the charging efficiency can be half or more of the maximum value. Therefore, in the power generator 8 of the portable device 10 worn on the wrist of the present example, in consideration of the magnitude and frequency of the turning motion of the rotary weight 13 caused by the movement of the wrist, the movement of the rotary weight 13 causes an initial stage. In addition, the piezoelectric body 20 is configured so that the electromotive voltage generated by the power generation device 8 becomes 1 to 7 times the specified voltage of the storage circuit 4 most frequently. Further, the rotary weight 1 is adjusted so that the frequency of the electromotive voltage becomes twice the specified voltage.
It is desirable to set 3 and the piezoelectric body 20. Therefore, in this example, the two piezoelectric element layers 26a and 2a are
6b are connected in series via the shim member 25 to secure a sufficient electromotive voltage. When a generator with a lower electromotive voltage than this example is desirable in supplying power to portable equipment,
It is possible to make the polarization directions of the piezoelectric element layers 26a and 26b of the piezoelectric body 20 face each other and connect these two voltage layers 26a and 26b in parallel.

FIG. 11 shows one of the methods for manufacturing the spiral piezoelectric body 20 employed in the power generator 8 of this example. FIG. 11 shows a method of manufacturing a piezoelectric body having a spiral shape or the like using the green sheet method developed as a manufacturing process of a laminated ceramic capacitor.
First, as shown in FIG. 11 (a), a green sheet 31 for preparing a film-formed shim material by slurrying a calcined powder of a ceramic such as zirconia together with an organic binder and a dispersion medium is prepared on both surfaces thereof. Apply metal paste or the like to make it conductive. Further, a calcinated powder of PZT is prepared as a piezoelectric ceramic, and a plurality of green sheets 32 to be a piezoelectric element layer which is also formed into a slurry with an organic binder and a dispersion medium are prepared. The green sheet 32 that serves as the piezoelectric element layer is laminated on both surfaces of the green sheet 31 that serves as the shim material. Then, as shown in FIG. 11B, the integrated green sheet 33 for the piezoelectric body is overlapped with the plastic spacer sheet 34 and pressed. Next, as shown in FIG. 11 (c), the green sheet 33 and the spacer 34 that have been wound in an overlapping manner are debindered and then sintered at 900 to 1400 ° C. As a result, the plastic spacer 34 burns down, and PZT piezoelectric element layers 26a and 26b are formed on both sides of the zirconia.
It is possible to fire a spiral piezoelectric body having. Further, FIG.
As shown in (d), the spiral piezoelectric body 20 having a spiral shape is manufactured by cutting the sintered body 35 into an appropriate size.
Before and after this cutting step, electrodes 27a and 27b are formed on the outer surface of the piezoelectric element layer using molten aluminum or the like. Then, a polarization process is performed using the electrodes 27a and 27b to form the spiral piezoelectric body 20.

The conventional green sheet method is a technique for laminating a plurality of ceramic sheets, but in this example,
It is possible to easily form a spiral piezoelectric element by using the technique of the green sheet method. Furthermore, this green sheet method makes it possible to easily mass-produce spiral piezoelectric elements and provide a power generation device suitable for small-sized portable equipment at low cost. Of course, by the manufacturing method using the green sheet method shown in FIG. 11, not only the piezoelectric body for power generation but also a spiral actuator using a piezoelectric element can be mass-produced, and an actuator capable of controlling a large displacement can be provided at low cost. it can.

Further, as shown in FIG. 12, two green sheets 33a and 33b for the piezoelectric body and two spacers 34a and 34b made of plastic are alternately wound on each other to form two sintered bodies. It can be manufactured in a single process. Therefore, it becomes possible to mass-produce the spiral piezoelectric element more efficiently. Of course, it is also possible to wind three or more green sheets for the piezoelectric body, which can further improve mass productivity.

[Embodiment 2] FIG. 13 shows a spiral piezoelectric body 2.
A different example of the portable device 10 storing 0 is shown.
Further, FIG. 14 is a sectional view showing a schematic arrangement inside the portable device 10 of the present example. Portable device 10 of this example
Is a disk-shaped case 1, a band 18 for mounting the case 1 on the user's wrist, and a rotary weight 1 that makes a swivel motion inside the case 1 as in the above embodiment.
3 is provided. In addition, the piezoelectric body 2 wound in a spiral shape
0 is also housed inside the case 1, and one end 22 (base end) on the outer peripheral side thereof is attached to the main plate 1a with a screw. Another inner peripheral end (tip) 21 of the piezoelectric body 20
Is connected to a speed increasing gear 36b, and this speed increasing gear 36b meshes with a transmission gear 36a which moves in conjunction with the rotary weight 13. In the portable device 10 of this example, the turning motion of the rotary weight 13 is caused by the gears 36a and 36b.
It is transmitted to the piezoelectric body 20 through the train of wheels, and the piezoelectric body 20 can be displaced. Therefore, also in the portable device 10 of the present example, the piezoelectric body 20 is displaced by the movement of the user's wrist or the like as in the portable device described above, and sufficient electric power can be generated to operate the portable device.

Further, in the present example, the movement of the rotary weight 13 is accelerated through the train wheel and transmitted to the piezoelectric body 20, so that the power generation piezoelectric body is formed in the spring type. 20 can be collectively installed on one side of the case 1, and the piezoelectric body wound on the mainspring can be shortened to be compact. Therefore, FIG.
As shown in, the large condenser 3 inside the case 1
7 or a space for installing a large-capacity power storage device such as a secondary battery can be secured. As shown in FIG. 14, the portable device 10 of this example mainly has a function as an electronic timepiece, and a second hand 41, a minute hand 42, and an hour hand 43 are arranged on the front surface side 1b of the case 1, and these are the hand movement axis. The time can be displayed by the rotational movement of 44.
The rotary weight 13 is provided on the back side 1 of the case 1 opposite to the front side 1b.
The space along the case 1 between the case 1 and the hand movement mechanism can be used as a turning space for the rotary weight 13. Furthermore, the mainspring type piezoelectric body 20 is compactly housed in the space on one side of the hand movement shaft 44 so that the turning motion of the rotary weight 13 is transmitted to the piezoelectric body 20 via the train wheel 36a and 36b. Has become. A large condenser 37 is installed at a position substantially symmetrical to the piezoelectric body 20 with respect to the hand movement shaft 44.

As described above, the portable device 10 of the present embodiment is small in size, in which the oscillating weight 13, the mainspring type piezoelectric body 20, and the large capacitor 37 are compactly assembled in the case 1, and is suitable for portable use. It is a device. Further, since the piezoelectric body 20 is used to generate power according to the movement of the user, the function of the portable device can be continuously utilized anytime and anywhere. Further, also in the portable device 10 of this example, the center of gravity 13c of the oscillating weight 13 uses the piezoelectric body 20 to efficiently utilize the movement of the user to obtain a large amount of electric power. For example, as shown in FIG. 13, when the direction at 1:30 is set downward, the mass of the rotary weight 13 is adjusted so that the center of gravity 13c of the rotary weight 13 is located in a horizontal direction with respect to the center of rotation 13b. The elastic force of the piezoelectric body 20 and the like are set.

Further, since the large capacity condenser 37 is installed inside the portable device 10 of this example,
The electric power generated by the piezoelectric body 20 can be stored, and the functions of the portable device can be stably and reliably utilized. In the portable device 10 of this example, the size of the condenser 37 that can be stored is determined by the space that can be secured between the fourth wheel 38 and the second wheel 39 of the drive system for the handwheel 44 and the rotary weight 13. From the viewpoint of ensuring stable performance, it is desirable to employ a small-sized and large-capacity capacitor such as an electric double layer capacitor.

[Third Embodiment] FIG. 15 shows a spiral piezoelectric body 20.
A different example of the portable device 10 equipped with is shown. The portable device 10 of this example is also provided with the disk-shaped case 1, and is a wristwatch-type portable device in which the case 1 can be worn on the wrist by the band 18. Therefore, the same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The power generator 8 mounted on the portable device 10 of this example includes a spiral bimorph type piezoelectric body 20. As shown in a partially enlarged view of FIG. 16, the piezoelectric body 20 of this example has two piezoelectric element layers 26a and 26b directly laminated, and electrodes 27a and 2 are provided on the outer surfaces thereof.
7b is formed. Then, one end (base end) 22 of the piezoelectric body 20 is fixed to the base plate 1 a by a board 15, and the electric current generated by the piezoelectric body 20 is supplied to the rectifier circuit 2 via the board 15. . On the other hand, the piezoelectric body 20
A weight 28 is attached to the other end (front end) 21 of the case 1 so that it can move in any direction within the space along the case 1 due to the acceleration applied to the case 1. Therefore, in the portable device 10 of this example, the weight 28 moves in association with the movement of the user's body or wrist, and the displacement caused by this movement is applied to the piezoelectric body 20 to generate electricity.

As for the movement of the user's wrist, when the device fitted on the outer side of the left wrist is taken as an example as described above, the 3 o'clock direction and the 12 o'clock direction frequently fall vertically downward.
Therefore, in this example, when the case 1 is placed in the horizontal direction, the weight 28 is positioned in the direction of 7:30 which is opposite to the direction of 1:30 in the middle of the 3 o'clock and 12 o'clock directions. The piezoelectric body 20 is set to do so. Therefore, if the user moves or stands up, the weight 28
The direction of gravity acting on the case changes, and the weight 28 moves inside the case 1 by almost the longest distance. Piezoelectric body 2 of this example
Since 0 is long and slender, it is displaced following the movement of the weight 28 and outputs electric power commensurate with the amount of displacement. Therefore, also in the portable device 10 of this example, the power generation device 8 is
The user's movements can be efficiently captured to generate power, a large amount of power generation can be secured, and a power generation device using a piezoelectric body that can be actually used can be realized.

The spiral piezoelectric body 20 of this example can be mass-produced by using the green sheet method similar to that of the above-mentioned embodiment, and can be provided at a low cost. Of course, the piezoelectric film can be formed by pasting it together or by using a manufacturing method such as sputtering. On the other hand, the above-described manufacturing method using the green sheet method can inexpensively and easily provide a high-quality spiral piezoelectric body. Therefore, as a manufacturing method of a piezoelectric body to be adopted as a power source for portable devices in the future, etc. Are suitable.

[Embodiment 4] FIG. 17 shows a different example of a power generator using a curved piezoelectric material according to the present invention. The power generation device 8 of this example is a device that is installed in a place where the acceleration changes in the vertical direction, such as in a vehicle, and that can generate power by using vertical vibration. For this reason, the piezoelectric body 20 extends in a coil shape, and is further formed in a conical shape with a sharp upper end in order to ensure stability in the left and right directions. A weight 28 is attached to the upper end 21 of the piezoelectric body 20, and the weight 28 vibrates due to a change in vertical acceleration, and a displacement is applied to the piezoelectric body 20. Electromotive force is generated in the piezoelectric body 20 by this displacement, and power is taken out from the lower base end 22 of the piezoelectric body 20 attached to a dashboard or the like in the vehicle and supplied to a power storage device such as a capacitor through the rectifier circuit 2. To be done.

In the power generator 8 of this example, the piezoelectric body 20 has a weight 2
In the direction of the acceleration applied to 8, that is, in the interior of the vehicle that vibrates up and down, it expands and contracts vertically, and the weight 28 supported by the piezoelectric body 20 also moves vertically. Therefore, since the weight 28 moves in the same direction as the vertical acceleration that is most frequently generated, the weight 28 can follow the vibration in the vertical direction with good response, and stable power generation is performed using the piezoelectric body 20. In addition, since the piezoelectric body 20 is formed in an elongated coil shape, the displacement given by the movement of the weight 28 is large, and a sufficient amount of power generation can be secured.

The power generator 8 of this example is suitable as a power source for accessories and electronic equipment installed in a vehicle, for example. If the electric power generated from the power generation device 8 is supplied to the electronic thermometer or the like through the secondary battery, the electronic thermometer can be used without being connected to a power source in the vehicle such as a cigarette lighter. Further, if the weight 28 is provided with a function such as an electronic thermometer, the function can be utilized only by placing the electronic thermometer in the vehicle. Further, by using it together with a large-capacity capacitor or a secondary battery, the power generator using the piezoelectric body of the present invention can be used as a power source even in an electronic device that requires continuous operation. Further, it is possible to construct a system in which a battery is used only as a backup power source for RAM or the like and a power generator using a piezoelectric body is used as a power source for other functions.

FIG. 18 shows a method of manufacturing the coil-shaped piezoelectric body 20 of this example by using the hydrothermal method. In the piezoelectric body 20 of the present example, first, a band-shaped phosphor bronze shim material 25 is processed into a coil shape, and both side surfaces 2 of the shim material 25 are spread in the width direction.
Titanium coating 29 is applied to 5a and 25b. The side surface of the shim member 25 in the thickness direction and the tip 21 of the shim member 25
By selectively applying the titanium coating 29 except for the tip 21 and the side surface in the thickness direction, the piezoelectric element layer 2 is formed only on both side surfaces 25a and 25b of the shim member 25.
6a and 26b can be formed. Tip 21 of shim material 25
It is desirable to expose the weight 28 so that the weight 28 can be mounted, and both side surfaces 25a and 25b of the shim member 25 can be exposed.
A bimorph type piezoelectric body can be manufactured by laminating the piezoelectric element layer on the.

The shim material 25 selectively coated with titanium is placed in an aqueous solution 50 containing the composition of the piezoelectric body, and heat 51 is applied to the aqueous solution 50 from the outside to heat it. When PZT is formed as the piezoelectric element layer, Pb (NO3) 2
, ShirOCl2, TiCl4, and KOH are charged with the shim material 25, heated to 100 to 130 ° C, and then subjected to hydrothermal treatment for 24 to 96 hours. As a result, PZT crystals grow on both side surfaces of the titanium-coated shim material 25, and a piezoelectric element layer is formed. Further, prior to this, the shim material 25 is changed to Pb (NO3
) 2, ZrOCl 2 and KOH are preferably added to a mixed aqueous solution and subjected to hydrothermal surface treatment at 140 to 160 ° C. for 4 to 25 hours to generate crystal nuclei.
By such hydrothermal treatment, P is applied to both sides of the shim material 25.
Piezoelectric element layers 26a and 26b made of ZT are formed. Further, electrodes are formed on the surfaces of the piezoelectric element layers 26a and 26b.

As described above, when the piezoelectric body 20 is manufactured by the hydrothermal method, even a piezoelectric body having a curved shape can be easily manufactured. Further, by selectively applying the titanium coating, it is possible to freely perform the processing such as forming the piezoelectric element layer except the place where the weight is attached. Therefore, unlike a case where a piezoelectric body is attached to a complicated shape or a piezoelectric body is manufactured by sputtering, a three-dimensional shape can be easily created and a curved piezoelectric body can be easily manufactured. In addition, a piezoelectric body having a desired shape can be manufactured at low cost without the trouble of cutting the piezoelectric element layer to add a weight.
Further, similarly to the green sheet method shown in FIG. 11, it is also possible to widely manufacture and cut in advance.

The shim material is not limited to phosphor bronze, but may be titanium, and a flexible piezoelectric body can be manufactured by using a heat resistant resin such as a polyimide film.

As shown in the above embodiments, by using the elongated piezoelectric body, the displacement with respect to the force F can be increased and a power generation device with a large amount of power generation can be realized.
By providing such a piezoelectric body with a curved portion in the longitudinal direction, a long piezoelectric body can be housed in a narrow space and can be mounted on a small portable device. The shape of the piezoelectric body is not limited to the spiral shape or the coil shape of the above embodiment, and may be, for example, the piezoelectric body 20 extending in an arc shape as shown in FIG. This piezoelectric body 20
One end 22 is attached to the base 55 and the other end 2
Since the weight 28 is added to 1, the piezoelectric body reacts sensitively to the vertical vibration, and a large displacement occurs in the piezoelectric body. Therefore, sufficient electric power can be obtained even if the piezoelectric body having such a shape is used.

Further, it is also possible to generate electric power by using the piezoelectric body 20 spirally wound around the coiled base 56 as shown in FIG. Such a piezoelectric body 20 is
A heat-resistant resin film such as polyimide is used as the shim material 25, and a thin piezoelectric element layer 26 such as PZT is formed on one side or both sides of the shim material 25. The film-shaped piezoelectric body 20 is used as the coil base 56. By wrapping around, it is possible to generate power using a very long piezoelectric body. The piezoelectric body 20 is displaced by the vertical movement of the coil base to generate electricity. Further, it is also possible to use the coil base made of metal as a conductor for collecting power.

The material constituting the piezoelectric body is not limited to PZT, but ceramic materials such as barium titanate and lead titanate, single crystal piezoelectric such as quartz, and PV.
It is also possible to use a polymer material such as DF.

Furthermore, the present invention is not limited to the wrist watch device described in the above embodiments. Examples of portable electronic devices other than watches include pagers,
The power generation device of the present invention can be applied to a telephone, a wireless device, a hearing aid, a pedometer, a calculator, an information terminal such as an electronic notebook, an IC card, a radio receiver, and the like. And these portable devices are downsized and stored in pockets,
When the wristband or other body can be worn by a band or the like, the power generator of this example is used to continuously generate power by the movement of the body, and each function can be used with the power. Therefore, it is possible to suppress the consumption of the battery in the device, or to eliminate the battery itself. Therefore, the user can use these portable devices without worrying about running out of battery, and it is possible to prevent troubles such as loss of contents stored in the memory due to running out of battery. Further, even if it is difficult to replenish the battery due to an area or place where the battery or the charging device is not easily available, or a disaster or the like, the function of the portable electronic device can be exerted.

[0060]

As described above, in the power generator of the present invention, the power generator is constituted by using the elongated strip piezoelectric body.
By displacing this elongated piezoelectric body, a large amount of power generation can be obtained by a predetermined force F. A long and thin strip-shaped piezoelectric body is provided with a curved portion in the longitudinal direction, and the piezoelectric body is formed into a spiral shape, a coil shape, or an arc shape so that the piezoelectric body can be housed in a portable and miniaturized device. Therefore, the power generation device equipped with the elongated piezoelectric body of the present invention for power generation can effectively capture naturally occurring movements such as movements of a human body and vibrations of a vehicle to generate electricity. Further, in the present invention, in order to efficiently capture the force generated by the living environment of the user such as the movement of the human body and the vibration of the car, the weight movement direction and the acceleration direction are aligned, and the neutral position of the rotary weight is set. Various techniques are used such as setting within a predetermined range. Then, by these techniques of the present invention, it is possible to provide an efficient power generation device capable of continuously securing a sufficient amount of power generation by the movement of the user's wrist or the like. Therefore, by using the power generation device of the present invention, it is possible to realize a portable electronic device having a variety of functions that can be reliably used anytime and anywhere.

Further, the present invention provides a simple manufacturing method for inexpensively mass-producing a piezoelectric body having a complicated shape such as a spiral shape or a coil shape by using the green sheet method or the hydrothermal method. Therefore, according to the present invention, it is possible to inexpensively provide a power generation device that can supply sufficient electric power by utilizing the movement of the human body, and it is possible to provide a power generation device and a portable device that use a piezoelectric body that can be practically used.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic configuration of a power generator and a portable device using a piezoelectric body according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a part of the piezoelectric body to show the configuration of the piezoelectric body shown in FIG.

3 is a cross-sectional view of a part of a portable device showing the configuration of the power generation device shown in FIG.

FIG. 4 is a diagram showing a state where the piezoelectric body shown in FIG. 1 is attached to a main plate of a portable device.

FIG. 5 is a diagram showing a state in which the portable device shown in FIG. 1 is mounted on a wrist and desk work is performed.

FIG. 6 is a diagram showing a state in which the portable device shown in FIG.

FIG. 7 is a diagram showing a state in which the portable device shown in FIG. 1 is mounted on a wrist and the rotary weight is in a neutral position.

8 is a graph showing changes in torque due to the piezoelectric body and torque due to the rotary weight when the portable device shown in FIG. 1 is worn on the wrist.

FIG. 9 is a graph showing how the rotary weight moves when torque fluctuates when the wrist is vibrated up and down in FIG.

FIG. 10 is a graph showing how the charging efficiency changes depending on the voltage ratio in the piezoelectric body.

FIG. 11 is a diagram showing a process of manufacturing the piezoelectric body shown in FIG. 1 by a green sheet method.

12 is a diagram showing a manufacturing method by a green sheet method different from the manufacturing method shown in FIG.

FIG. 13 is a diagram showing a schematic configuration of a wristwatch type portable device according to a second embodiment of the invention.

14 is a cross-sectional view showing a schematic configuration of the portable device shown in FIG.

FIG. 15 is a diagram showing a schematic configuration of a portable device according to a third embodiment of the invention.

16 is a partially enlarged view showing the structure of the piezoelectric body shown in FIG.

FIG. 17 is a perspective view showing a schematic configuration of a piezoelectric body of a power generation device according to a fourth embodiment of the present invention.

FIG. 18 is a diagram showing the manner of manufacturing the piezoelectric body shown in FIG. 17 by a hydrothermal method.

FIG. 19 is a diagram showing another example of the piezoelectric body used in the power generator according to the present invention.

FIG. 20 is a diagram showing a different example of the piezoelectric body used in the power generator according to the present invention.

[Explanation of symbols]

 2 ・ ・ Rectifier circuit 4 ・ ・ Storage circuit 6 ・ ・ Processing unit 8 ・ ・ Power generator 10 ・ ・ Portable electronic device 13 ・ ・ Rotating weight 14 ・ ・ Fixing rivet 15 ・ ・ Base 16 ・ ・ Base electrode 18・ ・ Band 19 ・ ・ Crown 20 ・ ・ Piezoelectric body 21 ・ ・ Piezoelectric tip 22 ・ ・ Piezoelectric base 25 ・ ・ Shim material 26 ・ ・ Piezoelectric element layer 27 ・ ・ Electrode 28 ・ ・ Weight 29 ・ ・ Titanium Coding 31..Green sheet of shim material 32..Green sheet of piezoelectric element layer 33..Green sheet for piezoelectric body 34..Spacer 35..Sintered body 36..Gear 37..Capacitor 50..Hydrothermal treatment Aqueous solution for water 55 ・ ・ Base 56 ・ ・ Coil

Front page continuation (72) Inventor Satoru Miyashita 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation (72) Inventor Makoto Furuhata 3-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (72) Inventor Taiji Hashimoto 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation

Claims (24)

[Claims] 1. A strip-shaped piezoelectric body having at least one curved portion formed in the longitudinal direction, a conductor formed on at least a part of the surface of the piezoelectric body, and a rectifying means connected to the conductor. A power generation device comprising: 2. The power generator according to claim 1, wherein the piezoelectric body is formed in at least one of a spiral shape, a coil shape, and an arc shape. 3. The piezoelectric body according to claim 1, wherein the piezoelectric body is a strip-shaped support body having at least one curved portion formed in a longitudinal direction, and the piezoelectric element formed on the curved portion on at least one side surface of the support body. A power generation device comprising: a layer. 4. The power generator according to claim 3, wherein the support is conductive. 5. The power generation device according to claim 1, wherein the piezoelectric body includes a plurality of piezoelectric element layers that are stacked directly or with a conductor interposed therebetween. 6. The power generator according to claim 1, wherein one end of the piezoelectric body is supported by a base and a weight is added to the other end. 7. The power generation system according to claim 1, wherein the piezoelectric body has elasticity, and the direction in which the piezoelectric body can expand and contract is substantially coincident with the direction of acceleration applied to the piezoelectric body. apparatus. 8. The piezoelectric body according to claim 1, wherein the piezoelectric body has elasticity, and one end of the piezoelectric body is supported so as to perform a swiveling motion with respect to the other end, and the piezoelectric body is balanced. A power generator in which the direction in which the one end starts the turning motion from a neutral position is substantially the same as the direction of acceleration applied to the piezoelectric body. 9. The piezoelectric body according to claim 1, further comprising: a base and a rotary weight that is supported by the base and pivotally moves along a predetermined revolving surface, wherein the curved portion of the piezoelectric body is substantially parallel to the revolving surface. The one end portion of the piezoelectric body is supported by the base, and the other end portion of the piezoelectric body is displaced by the turning motion of the rotary weight. 10. The power generator according to claim 9, wherein the other end is attached to a tip side of the rotary weight. 11. The power generator according to claim 9, further comprising a speed increasing unit that speeds up the turning motion of the rotary weight to drive the other end. 12. The power generator according to claim 9, wherein the turning motion of the rotary weight is transmitted to the other end through a train wheel. 13. The method according to claim 9, wherein the center of gravity of the rotary weight is positioned in a direction substantially orthogonal to the direction of acceleration with respect to the center of rotation of the rotary weight when the rotary weight is in a neutral state. Power generator. 14. The power generator according to claim 9, wherein when the rotary weight that can swivel in the vertical direction is in a stationary state, its center of gravity is located in a horizontal direction with respect to the swivel center of the rotary spindle. . 15. A portable device comprising: the power generation device according to claim 1; and a power storage unit that stores the current output from the rectification unit. 16. A power generation device according to claim 1, a power storage device that stores the current output from the rectification device, and a processing device that performs processing by the power supplied from the power storage device. And portable equipment. 17. The piezoelectric body according to claim 16,
A portable device characterized by having an ability to initially generate an open circuit voltage that is 1 to 7 times the specified voltage supplied to the processing device due to frequent changes in acceleration applied to the power generation device. . 18. The power generator according to claim 9, and a thin case for accommodating the power generator and attached to a wrist, wherein the rotary weight swivels in the case, and the case is substantially the same. The portable device, wherein the center of gravity of the rotary weight is positioned between 90 degrees and 180 degrees from the direction of the middle finger of the case toward the thumb when horizontal. 19. The power generator according to claim 9, and a thin case that houses the power generator and is attached to a wrist, wherein the rotary weight swivels in the case, and a middle finger of the case. When the direction of 45 degrees toward the little finger is set vertically downward, the center of gravity of the rotary weight is from 0 to 90 degrees from the direction of the middle finger of the case to the thumb, and the direction of the middle finger of the case. 90 degrees to 18 towards the little finger
A portable device characterized by being located anywhere between 0 degrees. 20. A step of forming a film on a green sheet using piezoelectric ceramic powder, a step of winding the green sheet with a burnable film material sandwiched between them, and a step of sintering the rolled green sheet. A method for manufacturing a piezoelectric body, comprising: 21. A step of forming a film on a green sheet by using piezoelectric ceramic powder, and a step of alternately winding a plurality of the green sheets and a burnable film material and winding them.
And a step of sintering the wound green sheets. 22. The method for manufacturing a piezoelectric body according to claim 5, further comprising a step of subjecting at least the curved portion of the support to a hydrothermal treatment in a mixed solution containing the composition of the piezoelectric body. And a method for manufacturing a piezoelectric body. 23. The method for manufacturing a piezoelectric body according to claim 22, wherein the support is made of titanium. 24. The method of manufacturing a piezoelectric body according to claim 22, wherein the surface of the support is selectively formed of titanium.