WO2016181603A1

WO2016181603A1 - Power generation device

Info

Publication number: WO2016181603A1
Application number: PCT/JP2016/001910
Authority: WO
Inventors: 洋一朗鈴木; 高岡　彰; 雅士森; 高俊関澤
Original assignee: 株式会社デンソー
Priority date: 2015-05-08
Filing date: 2016-04-05
Publication date: 2016-11-17
Also published as: JP6413914B2; JP2016213971A

Abstract

This power generation device is provided with: a fixing section (2); a beam section (4) wherein one end side is supported by the fixing section; a weight section (6), which is supported by the other end side of the beam section, and which is vibrated with the beam section; a stopper section (7) that regulates, by having the weight section in contact with the stopper section, movement of the weight section in the vibration direction; and a piezoelectric element (5), which is attached to the beam section, and which generates power by being deformed with deformation of the beam section. The weight section is provided with a magnet (9). The stopper section is provided with a coil (10) that is configured from a coil pattern formed on a printed board. The magnet and the coil are disposed facing each other. Power is generated at the coil with the vibration of the weight section that is provided with the magnet.

Description

Power generator

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-95902 filed on May 8, 2015, the contents of which are incorporated herein by reference.

This disclosure relates to a power generation apparatus including a vibration power generation device that generates power by vibration.

Conventionally, in Patent Document 1, a power generation device that generates power by vibration has been proposed. In this power generation device, a moving magnet is arranged in a cylindrical casing, and fixed magnets and piezoelectric elements that repel the moving magnet are provided on both sides in the moving direction of the moving magnet, and the fixed magnet is moved along with the movement of the moving magnet. Electric power is generated by applying the repulsive force applied to the piezoelectric element. In addition, in this power generation device, a helical coil wound around the moving part of the moving magnet in the casing is provided, and an induced electromotive force is generated in the coil by electromagnetic induction accompanying the movement of the moving magnet. In addition, power is generated even in the coil.

However, since the moving magnet is moved with the inner wall surface of the housing as the sliding surface, there is a problem of the life due to the strength of the sliding structure. Moreover, since it is the helical coil wound around the housing | casing, a coil body size becomes large. That is, since the generated power changes depending on the diameter and the number of turns of the coil, when the generated power is increased, the diameter of the coil increases and the number of turns increases, and the coil size increases. Thereby, the enlargement of a power generator is caused.

JP2011-166894A

An object of the present disclosure is to provide a power generation device that can improve the life of a power generation device by enabling power generation without using a sliding structure of a magnet, and that can reduce the size of the power generation device by reducing the size of a coil body. And

In the first aspect of the present disclosure, the power generation device includes a fixed portion, a beam portion supported on one end side by the fixed portion, and a weight portion supported on the other end side of the beam portion and vibrated together with the beam portion. And a stopper portion that is disposed in the vibration direction of the weight portion and restricts movement of the weight portion in the vibration direction by being brought into contact with the weight portion, and is attached to the beam portion, and the deformation of the beam portion A piezoelectric element that generates power by being deformed along with the piezoelectric element. The weight portion is provided with a magnet. The stopper portion is provided with a coil constituted by a coil pattern formed on a printed circuit board. The magnet and the coil are arranged to face each other. Power is generated in the coil in accordance with the vibration of the weight portion provided with the magnet.

Thus, in addition to the power generation by the piezoelectric element attached to the beam portion, the hybrid power generation structure in which both the power generation by the magnet provided in the weight portion and the coil provided in the stopper portion is performed. Since the movement of the magnet is restricted by the stopper portion, it is possible to prevent the beam portion and the piezoelectric element from being deformed excessively, and the strength of the beam portion and the piezoelectric element can be ensured. Therefore, it is possible to generate power without using a conventional sliding structure, and it is possible to improve the life of the power generation device as compared with the case where a sliding structure is used.

Moreover, since power generation can be performed by the coil provided on the printed circuit board, the coil body can be reduced in size, and the power generation device can be reduced in size.

Therefore, it is possible to generate power without using a magnet sliding structure, to improve the life of the power generator, and to reduce the size of the power generator by reducing the size of the coil body.

In the second aspect of the present disclosure, the power generation device includes a fixed portion, a beam portion supported on one end side by the fixed portion, and a weight portion supported on the other end side of the beam portion and vibrated together with the beam portion. A stopper portion that is disposed in the vibration direction of the beam portion and restricts movement of the beam portion and the weight portion in the vibration direction by being brought into contact with the beam portion, and is attached to the beam portion, A piezoelectric element that generates power by being deformed along with the deformation of the beam portion and a magnet are provided. A coil constituted by a coil pattern formed on a printed circuit board is provided in the beam portion. The magnet is provided at a position facing the coil. The coil generates power with the vibration of the beam portion.

As described above, the magnet is provided at a position facing the coil while the coil is formed of the coil pattern formed on the printed board in the beam portion. Such a structure is also a hybrid power generation structure in which, in addition to power generation by the piezoelectric element attached to the beam portion, power generation by both the magnet and the coil provided in the beam portion is performed. Thereby, the effect similar to a 1st aspect can be acquired.

The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
FIG. 1 is a diagram illustrating a cross-sectional configuration of the power generation device according to the first embodiment of the present disclosure. FIG. 2 is a schematic perspective view of the coil 10 provided in the power generator shown in FIG. FIG. 3 is a diagram illustrating a cross-sectional configuration of the power generation device according to the second embodiment of the present disclosure. FIG. 4 is a diagram illustrating a cross-sectional configuration of the power generation device according to the third embodiment of the present disclosure. FIG. 5 is a schematic perspective view of the coil 10 provided in the power generation device according to the fourth embodiment of the present disclosure. FIG. 6 is a schematic perspective view of the coil 10 provided in the power generation device according to the fifth embodiment of the present disclosure. FIG. 7 is a cross-sectional view showing a configuration example of the weight portion 6 described in another embodiment. FIG. 8 is a cross-sectional view illustrating a configuration example of the weight portion 6 described in another embodiment.

(First embodiment)
The power generation device according to the first embodiment of the present disclosure will be described. The power generation device described here is used, for example, as a device that is mounted in a tire mounted on a vehicle and generates power based on the rotation of the tire. For example, the power generation device is used for power generation of a tire side device in a direct tire pressure detection system (hereinafter referred to as TPMS: Tire Pressure Monitoring System).

In the direct type TPMS, a transmitter having a sensor such as a pressure sensor is directly attached to the tire side, and an antenna and a receiver are provided on the vehicle body side. Using such a configuration, in TPMS, data including the detection result of the sensor is transmitted from the transmitter, and data including the detection result is received by the receiver via the antenna, and the detection result is analyzed. The tire pressure is detected at. In such a TPMS, since a transmitter is attached to a place in the tire where it is difficult to supply power from the battery, it is desirable to provide a power generation device in the tire so that power can be supplied separately from the battery. The power generation apparatus of the present embodiment is preferably applied for power supply of such a direct TPMS transmitter.

As shown in FIG. 1, the power generation device 1 is configured to include a fixed portion 2, a support substrate 3, a beam portion 4, a piezoelectric element 5, a weight portion 6, a stopper portion 7, and the like.

The fixing unit 2 supports the components of the power generation device 1 such as the support substrate 3, the beam unit 4, the piezoelectric element 5, the weight unit 6, and the stopper unit 7, and is used to fix these components in the tire. For example, it is made of metal. The fixed portion 2 has a frame shape in which the upper surface shape is a rectangular shape. An opening 2 a is partially formed in the fixed portion 2, and the beam portion 4, the piezoelectric element 5, and the weight portion 6 are supported in the opening 2 a together with the support substrate 3. Moreover, the stopper part 7 is supported by each of the upper end surface and the lower end surface of the fixing | fixed part 2 by screwing.

The support substrate 3 is mounted with the piezoelectric element 5 together with the beam portion 4, and is formed with various wiring patterns such as a lead-out wiring 31 for the electric power generated by the piezoelectric element 5, and is configured by a printed circuit board, for example. The lead-out wiring 31 formed on the support substrate 3 is electrically connected to first and

second electrodes

51 and 52 provided in the piezoelectric element 5 described later through

bonding wires

32 and 33, and an electromotive force generated by the piezoelectric element 5. The current based on is taken out.

Further, the support substrate 3 is extended to the outside of the fixed portion 2, and a rectified storage circuit portion 34 and a power supply component 35 are provided in a portion extended to the outside of the fixed portion 2. Various wiring patterns including the lead-out wiring 31 are formed from the support substrate 3 to the portion extending from the inside to the outside of the fixed portion 2, and the rectifying power storage circuit portion 34 and the power supply component 35 are formed with respect to the various wiring patterns. Are electrically connected.

The rectifying power storage circuit unit 34 rectifies the current supplied from the piezoelectric element 5 and performs charging. For example, the rectifying power storage circuit unit 34 includes a rectifying element such as a diode and a capacitor for storing power. The power supply component 35 is a component that is supplied with power as a power source when charging is performed in the rectification power storage circuit unit 34 or a rectification power storage circuit unit 72 described later based on the power generated by the piezoelectric element 5 or the like. In the case of this embodiment, a microcomputer of a TPMS transmitter corresponds to the power supply component 35.

The beam portion 4 is made of, for example, a resin and is supported by being attached to the support substrate 3 together with the piezoelectric element 5 by, for example, adhesion. The beam portion 4 is disposed on one side of the weight portion 6 and supports the weight portion 6 on one side. That is, a cantilever support structure in which the weight portion 6 is supported by the beam portion 4 arranged on one side is provided. The beam portion 4 has a spring constant set based on the thickness and the like, and the other end, which is a free end, is vibrated as the tire rotates with one end supported by the support substrate 3 as a fulcrum. ing. A weight portion 6 is attached to the other end of the beam portion 4, and the weight portion 6 serves as a weight so that the amplitude of vibration associated with tire rotation is increased.

Note that, here, the beam portion 4 is supported together with the piezoelectric element 5 by the single support substrate 3, but this is merely an example, and other structures may be used. For example, the support substrate 3 may be a first substrate and a second substrate, and the beam 4 may be sandwiched between the first and second substrates together with the piezoelectric element 5. In that case, for example, the

electrodes

51 and 52 of the piezoelectric element 5 are electrically connected to the lead wires provided on one of the first and second substrates or to the lead wires provided separately on both. If it is set as a form, the electric power extraction from the piezoelectric element 5 can be performed.

The piezoelectric element 5 is attached to the beam portion 4 by pasting or the like, and generates power by being deformed together with the beam portion 4. Specifically, the piezoelectric element 5 includes a first electrode 51 and a second electrode 52, and a piezoelectric film 53 disposed between the first electrode 51 and the second electrode 52. The first electrode 51 and the second electrode 52 of the piezoelectric element 5 are electrically connected to different lead wires 31 formed on the support substrate 3, respectively.

When the piezoelectric element 5 configured as described above is deformed with the vibration of the beam portion 4, an electromotive force is generated between the first electrode 51 and the second electrode 52 due to the piezoelectric effect of the piezoelectric film 53 according to the displacement. Is generated. Charging in the rectifying power storage circuit unit 34 is performed by this electromotive force.

The weight portion 6 functions as a weight for increasing the vibration of the beam portion 4. In the case of the present embodiment, the weight portion 6 also functions as a magnet portion constituting the magnet 9, and here, the entire weight portion 6 is constituted by the magnet 9. The weight portion 6 is moved so as to swing toward both stopper portions 7 due to the deformation of the beam portion 4, and the magnet 9 constituting the weight portion 6 is magnetized with an N pole on one side in its moving direction, The other side is magnetized to the S pole. In the case of the present embodiment, the magnet 9 is magnetized with the N pole on the upper side of FIG. 1 and the S pole on the lower side of FIG. As the tire rotates, it is vibrated up and down in FIG. 1, and the magnet 9 functions as a weight, so that the vibration amplitude of the beam portion 4 increases. Thereby, the electric power generation amount by the piezoelectric element 5 becomes large, and larger electric power can be obtained.

It should be noted that the resonance frequency of the vibration of the weight portion 6 is determined according to the weight of the weight portion 6 and the distance from the support point at which the fixed portion 2 supports the beam portion 4 to the center of gravity of the weight portion 6. For this reason, it is possible to adjust the resonance frequency of the vibration of the weight portion 6 by appropriately adjusting these parameters.

The stopper portion 7 regulates the movement of the weight portion 6 and is disposed at a position away from the weight portion 6 at the time of non-vibration by being attached to the fixed portion 2, and the weight portion 6 is shown in FIG. The movement of the weight part 6 is regulated by contacting when the vertical vibration is performed. The stopper portion 7 is provided at each end of the fixed portion 2 and has the same configuration. In the case of the present embodiment, the coil 10 is constituted by the stopper portion 7, and here the coil 10 is a laminated substrate type coil.

As shown in FIG. 2, the multilayer substrate type coil is a multilayer printed circuit board in which a plurality of spiral coil patterns composed of conductors are formed on the surface of a base material composed of a thermoplastic resin. It is constituted by. The ends of the coil patterns are connected by a conductor, and have the same structure as a plurality of coils wound in a spiral shape by a laminated substrate type coil. And the stopper part 7 is affixed on the fixing | fixed part 2 so that the center position of a spiral coil pattern and the magnetization center of the magnet 9 may respond | correspond.

A general multilayer printed board is based on a thermosetting resin, but the multilayer printed board can be made a flexible board by using a thermoplastic resin as a base. For this reason, even if a plurality of base materials are superposed, the occurrence of base material cracking can be suppressed, and the thickness can be kept thin while realizing a coil with a large number of turns in which a large number of base materials are superposed. You can also. By using such a laminated substrate type coil, it is possible to reduce the size of the coil body as compared with a conventional helical coil wound around a casing.

The arrangement place of the coil 10 is a position facing the above-described weight portion 6, that is, a position facing the magnet 9. For this reason, when the magnet 9 is moved in the vertical direction on the paper surface in FIG. 1 as the tire rotates, the distance to the coil 10 varies, and an induced electromotive force is generated in the coil 10 due to electromagnetic induction.

The coil 10 provided in the stopper portion 7 is electrically connected to the rectifying storage circuit portion 72 through the lead wiring 71. Then, the electric power generated by the coil 10 is transmitted to the rectified energy storage circuit unit 72 having the same configuration as that of the rectified energy storage circuit unit 34 through the lead wiring 71, and the rectified energy storage circuit unit 72 is charged. The rectified power storage circuit portion 72 is connected to the lead wiring 31 formed on the support substrate 3 via the lead wiring 73 and the bonding wire 74, and is electrically connected to the power supply component 35 through these. For this reason, the electric power charged in the rectification electrical storage circuit unit 72 is supplied to the power supply component 35.

Note that the laminated substrate type coil as described above can be formed by, for example, PLAAP (Patterned Prepreg Lay-Up Process abbreviation: PALAP is a registered trademark). PALAP is prepared by patterning a conductor placed on the surface of a thermoplastic resin base material by etching, then making holes in the base material and filling the holes with resin-less metal paste, and overlaying them (layup) Are all pressed together. Since PALAP can incorporate an electronic component in addition to a conductor pattern obtained by patterning a conductor, it can also include a capacitor component. Therefore, it is possible to incorporate the above-described rectifying power storage circuit unit 72 in the PALAP. Since one layer of PALAP is as thin as about 50 μm, the total thickness can be kept thin even if the number of stacked layers is increased, and the number of windings can be increased. Therefore, the generated power can be increased while suppressing the thickness of the coil 10.

As described above, the power generation apparatus 1 according to the present embodiment is configured. Such a power generator 1 is attached to, for example, the back surface of a tread of a tire. For example, when the power generation apparatus 1 is caused to generate power by the force in the centrifugal direction of the tire, one surface provided with the stopper portion 7 is attached to the back surface of the tread of the tire. Moreover, when generating the power generation device 1 with a force in the rotational direction (tangential direction), one surface of the fixed portion 2 is attached to the back surface of the tread of the tire.

Subsequently, the operation of the power generation device 1 according to the present embodiment will be described in association with the operation of the TPMS.

When the tire is rotated, the beam portion 4 is vibrated by the centrifugal force or the rotational direction (tangential direction) force, and the piezoelectric element 5 is also deformed accordingly. At this time, since the weight portion 6 is provided, the weight portion 6 functions as a weight, so that the deformation amount of the beam portion 4 and the piezoelectric element 5 can be increased.

Then, due to the deformation of the piezoelectric element 5 at this time, an electromotive force is generated between the first electrode 51 and the second electrode 52 due to the piezoelectric effect of the piezoelectric film 53 provided in the piezoelectric element 5. As a result, the rectifying power storage circuit unit 34 is charged.

In addition, an induced electromotive force due to electromagnetic induction is also generated in the coil 10 by the vibration of the magnet 9 of the weight portion 6, and power generation is performed. As a result, the rectifying power storage circuit unit 72 is also charged.

As a result, the charged rectifying and accumulating

circuit units

34 and 72 are used as a power source, and the microcomputer of the transmitter of the TPMS is activated, and pressure detection by a sensor such as a pressure sensor provided in the transmitter is performed. . Then, the microcomputer performs signal processing on the pressure detection result and creates data including the detection result. Thereafter, when a predetermined transmission cycle comes, data including the detection result is transmitted by wireless communication using the charged rectifying and storing

circuit units

34 and 72 as a power source. This is input to the receiver through an antenna provided on the vehicle body side. By analyzing this data, the tire pressure is detected by the receiver.

As described above, in the power generation device 1 of the present embodiment, in addition to the power generation by the piezoelectric element 5 attached to the beam portion 4, the multilayer printed circuit board constituting the magnet 9 and the stopper portion 7 provided in the weight portion 6 is used. It is set as the hybrid electric power generation structure where both the electric power generation with the coil 10 provided is performed. Since the movement of the weight portion 6 is restricted by the stopper portion 7, it is possible to prevent the beam portion 4 and the piezoelectric element 5 from being deformed excessively and to secure the strength of the beam portion 4 and the piezoelectric element 5. Therefore, it becomes possible to generate power without using a conventional sliding structure, and it is possible to improve the life of the power generation apparatus 1 as compared with the case where a sliding structure is used.

In addition, since power can be generated by the coil 10 provided on the multilayer printed board, the size of the coil can be reduced and the power generator 1 can be reduced in size.

Therefore, it is possible to generate electric power without using a magnet sliding structure, and it is possible to improve the life of the power generation device 1 and to reduce the size of the power generation device 1 by reducing the size of the coil body.

(Second Embodiment)
A second embodiment of the present disclosure will be described. In the present embodiment, the support structure of the weight portion 6 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only portions different from the first embodiment will be described.

As shown in FIG. 3, in this embodiment, both sides of the weight portion 6 have a both-end supported structure supported by the fixed portion 2 via the beam portion 4. Even with such a double-sided support structure, the same effect as in the case of the cantilevered support structure as in the first embodiment can be obtained. In the case of such a double-end support structure, power generation can be performed by the piezoelectric elements 5 on both sides of the weight portion 6, so that the power generation amount by the power generation device 1 can be further increased.

(Third embodiment)
A third embodiment of the present disclosure will be described. In the present embodiment, the structure of the beam portion 4, the weight portion 6, the stopper portion 7, and the like is changed with respect to the first embodiment, and the others are the same as those in the first embodiment. Only different parts will be described.

As shown in FIG. 4, in this embodiment, the coil 10 is comprised by the beam part 4. As shown in FIG. Specifically, the beam portion 4 is a laminated substrate type coil formed of a flexible substrate as described in the first embodiment, and the flexible substrate functions as a beam. Since the spring constant of the flexible substrate is determined by the thickness of the flexible substrate, that is, the number of layers of the base material to be superimposed, the beam portion 4 having a desired spring constant can be obtained by adjusting the thickness of the flexible substrate. Although not shown, the coil 10 provided in the beam portion 4 is electrically connected to the lead wiring formed on the support substrate 3 and charges the rectifying power storage circuit portion through this lead wiring. ing.

Further, in the present embodiment, the weight portion 6 functions as a simple weight, and the magnet 9 is disposed at a position facing the beam portion 4 in the stopper portion 7, that is, a position facing the coil 10. As described above, the magnet 9 is attached to the stopper portion 7 so that the center of the coil 10 provided in the beam portion 4, that is, the center position of the spiral coil pattern and the magnetized center of the magnet 9 correspond to each other. It has been. The magnet 9 on the side attached to one stopper portion 7 is magnetized so that the coil 10 side is N-pole, and the magnet 9 on the side attached to the other stopper portion 7 is It is magnetized to have an S pole.

In this embodiment, the magnet 9 is also functioned as a part of the stopper portion 7. That is, when the beam portion 4 is vibrated and the vibration is increased, the beam portion 4 or the piezoelectric element 5 is brought into contact with the magnet 9 as the stopper portion 7 so that the movement of the weight portion 6 and the beam portion 4 is restricted. It has become.

Thus, the coil 10 may be provided in the beam portion 4, and the power generation in the coil 10 may be performed by the movement of the coil 10 accompanying the movement of the beam portion 4. In addition, since the beam portion 4 is constituted by the flexible substrate provided with the coil 10 as described above, the beam portion 4 and the coil 10 can be made common. Furthermore, the magnet 9 is also functioned as the stopper portion 7. If it does in this way, it will become possible to aim at reduction of a number of parts, and the product cost reduction of the electric power generating apparatus 1 can also be aimed at.

(Fourth embodiment)
A fourth embodiment of the present disclosure will be described. In the present embodiment, the structure of the coil 10 is changed with respect to the first to third embodiments, and the rest is the same as the first to third embodiments. Only the different parts will be described.

Also in this embodiment, the coil 10 is constituted by a laminated substrate type coil, but the coil pattern constituting the coil 10 is changed to the shape shown in FIG. Specifically, the coil 10 is configured by a coil coil having a frame shape with a part cut away, and a spiral coil formed by superimposing the coil pattern. One end side of the notched portion of the coil pattern of each layer is connected to the other end side of the coil pattern located in the upper layer, and the other end side of the lowermost coil pattern and the coil pattern of the uppermost layer Is connected to a lead wire (not shown).

Thus, the coil 10 can also be constituted by a helical coil. In the case of such a configuration, although the coil 10 is a spiral coil, since it is a laminated substrate type coil, the thickness can be reduced, and the same effects as those of the above embodiments can be obtained.

(Fifth embodiment)
A fifth embodiment of the present disclosure will be described. This embodiment is also a modification of the structure of the coil 10 with respect to the first to third embodiments, and the rest is the same as the first to third embodiments. Only the different parts will be described.

Also in this embodiment, the coil 10 is constituted by a laminated substrate type coil, but the coil pattern constituting the coil 10 is changed to the shape shown in FIG. Specifically, the coil pattern formed on the surface of the two-layer base material has a layout in which a plurality of strips are arranged at regular angular intervals along a circle. Each strip on the lower layer side is provided inclined at the same angle with respect to a radial straight line passing from the center of the circle to the end of each strip closer to the center of the circle, and each strip on the upper layer side is It is provided so as to be inclined at the same angle in the opposite direction of the circumferential direction with each strip on the lower layer side with respect to the straight line. Of the strips on the lower layer side, the end on the side far from the center of the circle and the end on the side farthest from the center of the circle on the strip on the upper layer are electrically connected, and among the strips on the lower layer side, near the center of the circle Among the strips on the side and the strips on the upper layer side, the ends on the side close to the center of the circle are electrically connected. And about two of the strips on the upper layer side, one end is not connected to the strip on the lower layer side, but is connected to a lead-out wiring (not shown).

The coil 10 can also be configured by such a structure. Even in such a configuration, since the coil 10 is a laminated substrate type coil, the thickness can be reduced, and the same effects as those of the above-described embodiments can be obtained.

(Other embodiments)
For example, in the first to third embodiments, the coil 10 is a multilayer substrate type coil constituted by a multilayer printed board, but may be a coil constituted by a single layer printed board. For example, the coil 10 may be configured by only one layer of the spiral coil pattern shown in FIG.

Moreover, in the said 3rd Embodiment, although the weight part 6 is made to function only as a mere weight, it combines with the 1st and 2nd embodiment, the weight part 6 is also made into the magnet 9, and the coil 10 is provided in the stopper part 7 If it becomes, it will become possible to increase electric power generation further. Moreover, in the said 3rd Embodiment, although the stopper part 7 was comprised by the magnet 9, you may comprise the stopper part 7 and the magnet 9 by another member.

Moreover, in the said 1st, 2nd embodiment, when the weight part 6 is made into the magnet 9, the whole weight part 6 is made into the magnet 9, However, The whole is not made into the magnet 9, but only the part facing the coil 10 is used. May be the magnet 9. For example, as shown in FIG. 7, a structure in which the center portion of the weight portion 6 is a weight plate 61 made of metal or the like and the magnets 9 are arranged on both sides of the weight plate 61 may be adopted. In that case, since the weight of the weight portion 6 can be adjusted as a whole by the weight of the weight plate 61, the resonance frequency of the weight portion 6 can be adjusted by adjusting the weight of the weight plate 61.

Moreover, in 3rd Embodiment, although the magnet 9 is functioned also as a part of stopper part 7, when the weight part 6 contact | abuts a part different from the magnet 9 among the stopper parts 7, the weight part 6 of FIG. The movement may be restricted.

Furthermore, in each of the embodiments described above, it is preferable that the coil 10 is of a magnetic material built-in type in order to improve the power generation by the coil 10. For example, as shown in FIG. 8, in the first embodiment, by arranging the magnetic body 10 a at the center of the coil 10, the magnetic body built-in type coil 10 can be obtained. In addition, since PLAAP can also incorporate the magnetic body 10a in addition to the conductor pattern that forms the conductor portion of the coil 10, it is preferable to configure the magnetic body built-in type coil 10 by PLAAP. Thus, by forming the coil 10 with a built-in magnetic body by PALAP, it is possible to increase the power generation while suppressing the thickness of the coil 10.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A fixing part (2);
A beam part (4) supported at one end by the fixed part;
A weight portion (6) supported on the other end side of the beam portion and vibrated together with the beam portion;
A stopper portion (7) that is disposed in the vibration direction of the weight portion and regulates the movement of the weight portion in the vibration direction by contacting the weight portion;
A piezoelectric element (5) attached to the beam portion and generating power by being deformed along with the deformation of the beam portion,
The weight portion is provided with a magnet (9),
The stopper portion is provided with a coil (10) constituted by a coil pattern formed on a printed circuit board,
The magnet and the coil are arranged to face each other,
A power generation device in which power is generated by the coil in accordance with vibration of the weight portion provided with the magnet.
The beam portion is disposed only on one side of the weight portion,
The power generation device according to claim 1, wherein the weight portion has a cantilever support structure supported by the beam portion on one side.
The beam portion is disposed on both sides of the weight portion,
The power generation device according to claim 1, wherein the weight portion has a both-end support structure in which the beam portions on both sides are supported.
The coil is a multilayer substrate type coil configured by using the printed circuit board as a multilayer printed circuit board,
The power generation apparatus according to any one of claims 1 to 3, wherein the multilayer printed circuit board is configured by a flexible substrate having a thermoplastic resin as a base material.
A fixing part (2);
A beam part (4) supported at one end by the fixed part;
A weight portion (6) supported on the other end side of the beam portion and vibrated together with the beam portion;
A stopper portion (7) that is disposed in the vibration direction of the beam portion and restricts movement of the beam portion and the weight portion in the vibration direction by being brought into contact with the beam portion;
A piezoelectric element (5) that is attached to the beam portion and generates electric power by being deformed along with the deformation of the beam portion;
With a magnet (9),
A coil (10) configured by a coil pattern formed on a printed circuit board is provided in the beam portion,
The magnet (9) is provided at a position facing the coil,
A power generation device in which power is generated by the coil in accordance with vibration of the beam portion.
The coil is a multilayer substrate type coil configured by using the printed circuit board as a multilayer printed circuit board,
The multilayer printed board is constituted by a flexible board based on a thermoplastic resin,
The power generator according to claim 5, wherein the beam portion is configured by the flexible substrate.
The magnet functions as a part of the stopper portion;
The power generation device according to claim 5 or 6, wherein movement of the weight portion is restricted by causing the beam portion to abut on the magnet.