KR20150091822A - Piezoelectric energy harvesting apparatus and self generating sensor using the same - Google Patents

Abstract

Disclosed is a piezoelectric energy harvesting apparatus which is attached to the surface of a vibrator under a poor vibration condition and collects required electric energy, and a self generating sensor using the same. According to an embodiment of the present invention, a piezoelectric energy harvesting apparatus has a plurality of piezoelectric layers arranged in the shape of a matrix, includes a piezoelectric layer array attached to the surface of a vibrator, and generates electric energy through the piezoelectric layer by applying an impact to the piezoelectric layers individually or simultaneously in association with the micro-displacement vibration of the vibrator.

Description

TECHNICAL FIELD [0001] The present invention relates to a piezo-electric energy harvesting device having a vibrating body surface, and a self-generating sensing device using the piezoelectric energy harvesting device. [0002]

Embodiments of the present invention relate to a piezoelectric energy harvesting device capable of collecting electric energy by changing vibration energy to electric energy in a state of being attached to a surface of a vibrating body having a poor vibration condition and a self-powered sensing device using the same .

Piezoelectric energy Harvesting refers to the conversion of external mechanical energy into electrical energy by the deformation of piezoelectric materials, using piezoelectric materials as a medium through which electric polarization appears when mechanical deformation is applied from the outside.

Particularly, a device installed in a structure (hereinafter, referred to as a vibrating body) where vibrations are generated to perform piezoelectric energy harvesting can be considered.

However, most of the vibrating members, which are commonly seen in the vicinity, have a vibration condition of a poor condition having a relatively low frequency of 100 Hz or less or a weak force (low acceleration condition) Therefore, in the case of a conventional cantilever-type piezoelectric energy harvesting device that operates natural vibration as an external energy factor, it is not easy to design a cantilever for vibrating body and resonance. In order to collect a larger amount of energy by energy conversion, There are difficulties.

Therefore, a new method is being sought for easily obtaining a necessary amount of electric energy by increasing the micro displacement vibration of the vibrating body under a poor vibration environment condition.

A power generation device using a piezoelectric element (Korean Patent Laid-Open Publication No. 2011-0018586)

The present invention relates to a piezoelectric energy harvesting device capable of collecting a necessary amount of electric energy by effectively hitting a piezoelectric film array even with a fine vibration after attaching a piezoelectric film array composed of a plurality of piezoelectric films to a surface of a vibrating body, Self-powered sensing device.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a piezoelectric actuator comprising: a plurality of piezoelectric films arranged in a matrix; and a piezoelectric film array attached to a surface of the vibrating body, Or at the same time a piezoelectric energy hubbing device for generating electric energy through the piezoelectric film.

According to another aspect of the present invention, there is provided a piezoelectric actuator comprising: a piezoelectric film array having a plurality of piezoelectric films arranged in a matrix and attached to a surface of a vibrating body; and a piezoelectric film hitting structure for generating electric energy through the piezoelectric film, The piezoelectric film striking structure includes a plurality of supports fixed to a surface of the vibrating body; A connecting plate which is connected to the support via an elastic member and oscillates in conjunction with the micro displacement vibration of the oscillator; And a striking protrusion protruding from the connection plate toward the plurality of piezoelectric films.

According to still another aspect of the present invention, there is provided a piezoelectric actuator comprising: a piezoelectric film array having a plurality of piezoelectric films arranged in a matrix and attached to a surface of a vibrating body; and a piezoelectric film hitting structure for generating electric energy through the piezoelectric film The piezoelectric film striking structure includes a plurality of supports fixed to a surface of the vibrating body; A connecting plate connected to the support and movable in a lateral direction; A plurality of elastic members interposed between the connection plate and the plurality of piezoelectric films; And a striking protrusion protruding from each of the plurality of elastic members toward each of the plurality of piezoelectric films.

According to still another aspect of the present invention, there is provided a piezoelectric actuator comprising: a piezoelectric film array having a plurality of piezoelectric films arranged in a matrix and attached to a surface of a vibrating body; and a piezoelectric film hitting structure for generating electric energy through the piezoelectric film A piezoelectric film striking structure attached to a surface of the vibrating body; And a striking plate built in between the housing and an elastic member and having a plurality of striking fins integrally protruded toward the plurality of piezoelectric films.

According to still another aspect of the present invention, there is provided a piezoelectric actuator comprising: a piezoelectric film array having a plurality of piezoelectric films arranged in a matrix and attached to a surface of a vibrating body; and a piezoelectric film hitting structure for generating electric energy through the piezoelectric film A piezoelectric film striking structure attached to a surface of the vibrating body; And a plurality of striking pins individually protruding toward the plurality of piezoelectric films, a front assembly part for housing the plurality of striking pins, a rear assembly part coupled to the front assembly part, And a striking plate including an elastic member interposed between the parts.

According to another aspect of the present invention, there is provided a piezoelectric energy harvesting apparatus including a piezoelectric energy harvesting apparatus and a sensing unit for detecting environmental conditions inside and outside the vibrating body through electric energy generated by using the piezoelectric energy harvesting apparatus Self-powered sensing device.

According to an embodiment of the present invention, by attaching a piezoelectric film array composed of a plurality of piezoelectric films on the surface of a vibrating body having a poor vibration condition, it is possible to effectively strike the piezoelectric film using the micro displacement vibration of the structure.

As a result, piezoelectric resonance capable of collecting a necessary amount of electric energy in a vibrating body having a poor vibration condition can be made possible.

1 is a conceptual view schematically showing a piezoelectric energy harvesting apparatus according to a first embodiment of the present invention.
FIG. 2 is a plan view schematically showing a piezoelectric film array in a piezoelectric energy harvesting apparatus according to a first embodiment of the present invention. FIG.
FIG. 3 is a conceptual view showing a hemispherical shape of the impact protrusion in the piezoelectric energy harvesting apparatus according to the first embodiment of the present invention. FIG.
4 is a view schematically showing a position and a structure between a piezoelectric film and a hitting projection in a piezoelectric energy harvesting apparatus according to a first embodiment of the present invention.
5 is a conceptual view schematically showing a piezoelectric energy harvesting apparatus according to a second embodiment of the present invention.
6 and 7 are conceptual diagrams of a self-powered sensing device using a piezoelectric energy harvesting device according to an embodiment of the present invention.
8 is an exploded perspective view showing an example of a piezoelectric film hitting structure of a piezoelectric energy harvesting apparatus according to an embodiment of the present invention.
9 is a rear perspective view of the piezoelectric film hitting structure shown in Fig.
10 is a view schematically showing a piezoelectric energy harvesting apparatus provided with the piezoelectric film hitting structure shown in Fig.
11 is an exploded perspective view showing still another example of a piezoelectric film hitting structure of a piezoelectric energy harvesting apparatus according to an embodiment of the present invention.
12 is a view schematically showing a piezoelectric energy harvesting apparatus provided with the piezoelectric film hitting structure shown in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

Piezoelectric energy harvesting is a process of converting external mechanical energy into electric energy using piezoelectric materials (hereinafter, referred to as "piezoelectric members") that utilize the phenomenon of electric polarization when mechanical deformation is applied from the outside .

First Embodiment

1 is a conceptual view briefly showing a piezoelectric energy harvesting apparatus according to a first embodiment of the present invention.

As shown in the figure, the piezoelectric energy harvesting apparatus 100 according to the first embodiment of the present invention applies a blow to a piezoelectric film array 110 and a plurality of piezoelectric films 111 provided in the piezoelectric film array Includes a piezoelectric film striking structure (130).

The piezoelectric film array 110 may be provided in the form of a plurality of piezoelectric films 111 arranged in a matrix form and attached to the surface of the vibrating body 1.

The planar shape of the piezoelectric film array 110 can be specifically confirmed with reference to FIG.

2 is a plan view schematically showing a piezoelectric film array.

As shown in the figure, the piezoelectric film array 110 may include a plurality of piezoelectric films 111 in a matrix in which the piezoelectric films 111 are regularly arranged in a predetermined shape, that is, in rows and columns.

The plurality of piezoelectric films 111 may be first formed into a large-area sheet shape, and then divided into a predetermined matrix shape through dicing. Alternatively, the plurality of piezoelectric films 111 may be provided after being individually fabricated and then regularly arranged in a predetermined matrix form.

In the piezoelectric film array 110, an electrode 113 may be provided on at least one of the upper and lower surfaces of the plurality of piezoelectric films 111.

As a preferred example, the piezoelectric film may be formed of a material selected from the group consisting of Pb (Zr, Ti) O3, Pb (Zr, Ti) O3 + Pb (Zn, Nb) O3, Pb (Zr, Ti) O3 + silicon polymer, and Pb (Zr, Ti) O3 + epoxy polymer as the material of the (Na, K) NbO3- (Li, Na, K) TaO3, Pb (Zr, Ti) O3 + PVDF polymer, , Or a composite material comprising one or more of these materials.

As a preferred example, the electrode may be formed of at least one of platinum (Pt), gold (Au), silver (Ag), copper (Cu), aluminum (Al), tantalum (Ta), titanium (Ti), palladium Ruthenium (Ru), tantalum nitride (TaN), and titanium nitride (TiN).

The piezoelectric film array 110 may further include an adhesive film 115 to attach a plurality of piezoelectric films 111 to the surface of the vibrating body.

Here, the material and type of the adhesive film 115 are not particularly limited and can be used as long as the adhesive film 115 has good durability and abrasion resistance.

Also, the size and number of the plurality of piezoelectric films 111 provided in the piezoelectric film array 110 need not be limited.

Also, the shape of each of the plurality of piezoelectric films 111 may be provided in a shape other than a square shape.

Next, the piezoelectric film hitting structure 130 will be described.

The piezoelectric film striking structure 130 may be configured to effectively strike the plurality of piezoelectric films 111 in conjunction with the micro displacement vibration of the vibrating body 1, as shown in FIG. As a result, the piezoelectric film 111, which is hit by the piezoelectric film striking structure 130, can generate electric energy.

The piezoelectric film striking structure 130 may include a plurality of supports 131, a connection plate 133, and a strike protrusion 135.

The support 131 may be provided on a surface of the vibrating body 1. The support base 131 may protrude in a direction crossing the surface of the vibrating body 1.

The connection plate 133 may be connected to the support base 131 via an elastic member 132. Accordingly, the micro displacement vibration of the vibrating body 1 transmitted to the support base 131 can be naturally transmitted to the connection plate 133.

The connection plate 133 may be provided with a plurality of striking projections 135. The striking projections 135 may protrude toward the plurality of piezoelectric films 111.

Referring to FIG. 1, the shape of the striking protrusion 135 is shown to have a square or rectangular cross-sectional shape. Alternatively, referring to the modification of FIG. 3, the shape of the striking protrusion 135 may be a hemispherical shape .

Here, the structure between the strike protrusion 135 and the plurality of piezoelectric films 111 will be described in more detail with reference to FIG.

4 is a view schematically showing the position and structure between the piezoelectric film and the impact protrusion in the piezoelectric energy harvesting apparatus according to the first embodiment of the present invention.

Referring to FIG. 4A, a strike protrusion 135 having a square or rectangular cross-sectional shape toward the flat surface of the illustrated piezoelectric film 111 is configured to apply an impact toward the strike direction have.

Referring to Fig. 4 (b), a striking projection 135 having a hemispherical body is disclosed. At this time, the piezoelectric film 111 may be formed in a film form.

Referring to FIG. 4C, the striking protrusion 135 has a hemispherical body, and a shape of a facing surface of each of the piezoelectric films 111 is formed so as to be in contact with a protruding front surface 135a of the striking protrusion, And has a surface 111a.

As described above, the shape of the piezoelectric film 111 and the shape of the strike protrusion 135 may be slightly different, and the strike protrusion 135 may be formed on the piezoelectric film 111 using the micro displacement vibration transmitted from the vibrating body. Any structure capable of hitting more effectively can be used.

In addition, a plurality of piezoelectric films 111 may be provided in a state where a pre-stress is applied so that each of the impact protrusions 135 may be contact-pressed beforehand.

In FIG. 1, reference numerals v1 and v2 denote directions of micro displacement vibration.

According to the first embodiment of the present invention described above, by attaching a piezoelectric film array composed of a plurality of piezoelectric films on the surface of a vibrating body having a poor vibration condition, a plurality of piezoelectric films can be simultaneously hit by using the micro displacement vibration of the structure You can give. This has the advantage of being able to more efficiently collect the required amount of electrical energy.

Second Embodiment

5 is a conceptual view briefly showing a piezoelectric energy harvesting apparatus according to a second embodiment of the present invention.

Referring to FIG. 5, a piezoelectric energy harvesting apparatus 200 according to a second embodiment of the present invention includes a plurality of piezoelectric films 211 arranged in a matrix form and attached to a surface of a vibrating body 1 And a piezoelectric film striking structure 230 for generating electrical energy through the piezoelectric film 211. [

The piezoelectric film striking structure 230 includes a plurality of supporting members 231, a connecting plate 233, a plurality of elastic members 232 and a plurality of striking projections 235.

The support 231 may be fixed to the surface of the vibrating body 1.

The connection plate 233 may be connected to the support 231 so as to be transversely movable (i.e., oscillatable in the lateral direction).

Particularly, in the case of the piezoelectric energy harvesting apparatus 200 according to the second embodiment of the present invention, a plurality of elastic members 232 are provided from the connection plate 233 toward the plurality of piezoelectric films 211 in the same number As shown in FIG.

The striking protrusions 235 protrude from the plurality of elastic members 232 toward the plurality of piezoelectric films 211, respectively.

Such a structure has a structure in which a force can be applied to the piezoelectric film array 210 in advance and applies vibration to each of the plurality of piezoelectric films 211 constituting the piezoelectric film array 210 individually A plurality of elastic members 232 are provided on the connection plate 233 so that the elastic members 232 are provided.

In particular, the connecting plate 233 may have a cross-sectional shape in which the mass is asymmetric along the longitudinal direction. For example, in order to maximize the influence of gravity and induce a balanced vibration, Shape. Alternatively, the cross-sectional shape of the connecting plate 233 may be slightly different in consideration of various conditions in which the vibrating body 1 is installed.

FIG. 6 is a conceptual view of a self-powered sensing device using a piezoelectric energy harvesting device according to a first embodiment of the present invention, and FIG. 7 is a schematic view of a self-powered sensing device using a piezoelectric energy harvesting device according to a second embodiment of the present invention. Fig.

The self-powered sensing device of the vibrating body 1 according to the first and second embodiments of the present invention includes the piezoelectric film arrays 110 and 210 and the piezoelectric film striking structures 130 and 230 And a sensing unit 300 mounted on the vibrating body 1 for detecting necessary information. Here, the information detected by the sensing unit 300 may include environmental conditions such as temperature, humidity, and gas inside and outside the vibrating body.

The sensing unit 300 receives electric energy generated by the piezoelectric energy harvesting apparatuses 100 and 200 according to the first and second embodiments of the present invention to detect various information of the vibrating body 1 . ≪ / RTI >

Various information detected through the sensing unit 300 can be transmitted using the wireless transceiver 400 and various information of the vibrating body 1 can be wirelessly transmitted to a separate integration server 500 . As a result, the user can remotely monitor all information necessary for the analysis and diagnosis of the vibrating body.

As a concrete example of the piezoelectric film hitting structure that can be provided according to a preferred embodiment of the present invention, reference is made to Figs. 8 to 12.

FIG. 8 is an exploded perspective view showing an example of a piezoelectric film hitting structure of a piezoelectric energy harvesting apparatus according to an embodiment of the present invention, and FIG. 9 is a rear perspective view.

8 and 9, the piezoelectric film striking structure 330 includes a housing 331 attached to a surface of the vibrating body, and a plurality of piezoelectric actuators 333 interposed between the housing and the piezoelectric actuating structure 333 via a predetermined elastic member 333. [ And a striking plate 335 integrally projecting the striking pin toward the plurality of piezoelectric films.

A plurality of (e.g., four) shim members 337 may be further provided to prevent the striking plate 335 from being separated outwardly by the elasticity of the elastic member 333 in the housing 331 .

Such a shape is one preferred exemplary shape and need not necessarily be limited thereto.

Referring to FIG. 10, the cross-sectional structure of the piezoelectric energy harvesting apparatus having the piezoelectric film hitting structure 310 exemplified in FIGS. 8 and 9 can be confirmed.

That is, it can be seen that the striking plate 335 is disposed so as to effectively strike the plurality of piezoelectric films 311 attached to the surface of the vibrating body 1.

As another exemplary embodiment, referring to FIG. 11, the shape and structure of the piezoelectric film striking structure can be confirmed.

Referring to FIG. 11, the piezoelectric film striking structure 430 includes a housing 431 attached to a surface of the vibrating body, and a striking plate 435 capable of striking the plurality of piezoelectric films.

Particularly, the striking plate 435 includes a plurality of striking pins 435b individually projecting toward the plurality of piezoelectric films, a front assembling portion 435c accommodating the plurality of striking pins, And an elastic member 433 interposed between the plurality of striking fins and the rear assembly part.

12 is a view schematically showing a piezoelectric energy harvesting apparatus provided with the piezoelectric film striking structure shown in Fig. 11, in which a striking plate 435 is attached to a plurality of piezoelectric films 411 attached to the surface of the vibrating body 1, , More specifically, a plurality of the impact pins 435b are disposed so as to effectively apply impact.

As described above, according to the structure and the function of the present invention, a piezoelectric film array composed of a plurality of piezoelectric films is attached to the surface of a vibrating body under poor vibration conditions, and the piezoelectric film array The effect can be obtained by collecting the necessary amount of electric energy simultaneously or individually.

Further, by using the piezoelectric energy harvesting apparatus according to an embodiment of the present invention, necessary information on a structure having a poor vibration condition can be detected by a self-generating method.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, This is obvious.

It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are not to be construed in a limiting sense, and the scope of the present invention is indicated by the appended claims rather than by the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

1: oscillating body
100 (200): Piezoelectric energy harvesting device
110 (210): Piezoelectric film array
111 (211, 311, 411): piezoelectric film
111a:
113 (213): electrode
115 (215): Adhesive film
130 (230, 330, 430): piezoelectric film hitting structure
131 (231): Support
132 (232): elastic member
133 (233): connecting plate
135 (235): striking projection
135a: front of striking projection
500: sensing unit
600: wireless transmitting /
700: Integration Server

Claims (28)

A plurality of piezoelectric films arranged in a matrix form and including a piezoelectric film array attached to a surface of the vibrating body,
Wherein piezoelectric energy is generated through the piezoelectric film by applying blows to the plurality of piezoelectric films individually or simultaneously in conjunction with the micro displacement vibration of the vibrating body.
The method according to claim 1,
The plurality of piezoelectric films may be formed of,
The piezoelectric energy harvesting device is provided in a matrix form prepared by dicing after being manufactured in a large area sheet form or in a plurality of arrangements in a set matrix form after each piezoelectric film is individually manufactured.
The method according to claim 1,
The plurality of piezoelectric films may be formed of,
And an electrode provided on at least one side of the upper and lower surfaces of the piezoelectric energy harvesting device.
The method according to claim 1,
The piezoelectric film array includes:
And an adhesive film to adhere the plurality of piezoelectric films to the surface of the vibrating body.
A plurality of piezoelectric films arranged in a matrix form and attached to a surface of a vibrating body; and a piezoelectric film striking structure for generating electrical energy through the piezoelectric film,
The piezoelectric film striking structure includes a plurality of supports fixed to a surface of the vibrating body;
A connecting plate which is connected to the support via an elastic member and oscillates in conjunction with the micro displacement vibration of the oscillator; And
And a striking protrusion protruding from the connection plate toward the plurality of piezoelectric films.
A plurality of piezoelectric films arranged in a matrix form and attached to a surface of a vibrating body; and a piezoelectric film striking structure for generating electrical energy through the piezoelectric film,
The piezoelectric film striking structure includes a plurality of supports fixed to a surface of the vibrating body;
A connecting plate connected to the support and movable in a lateral direction;
A plurality of elastic members interposed between the connection plate and the plurality of piezoelectric films; And
And a striking protrusion protruding from each of the plurality of elastic members toward each of the plurality of piezoelectric films.
The method according to claim 5 or 6,
The striking projection
A piezoelectric energy harvesting device having a hemispherical shape.
The method according to claim 5 or 6,
The impact protrusion has a hemispherical shape,
Wherein the facing surfaces of the plurality of piezoelectric films have arcuate surfaces so as to be in close contact with protruding front surfaces of the impact protrusions.
The method according to claim 5 or 6,
The striking projection
A piezoelectric energy harvesting device having a square or rectangular cross-sectional shape.
The method according to claim 5 or 6,
The plurality of piezoelectric films may be formed of,
The piezoelectric energy harvesting device is provided in a matrix form prepared by dicing after being manufactured in a large area sheet form or in a plurality of arrangements in a set matrix form after each piezoelectric film is individually manufactured.
The method according to claim 5 or 6,
The plurality of piezoelectric films may be formed of,
And an electrode provided on at least one side of the upper and lower surfaces of the piezoelectric energy harvesting device.
The method according to claim 5 or 6,
The plurality of piezoelectric films may be formed of,
Pb (Zr, Ti) O3, Pb (Zr, Ti) O3, Pb (Zr, Ti) O3 + Pb (Zn, Nb) O3, (Ba, Bi, (Zr, Ti) O 3 + silicone polymer, Pb (Zr, Ti) O 3 + epoxy polymer, or a material selected from the group consisting of NbO 3 - (Li, Na, K) TaO 3, Pb (Zr, Ti) O 3 + PVDF polymer, A piezoelectric energy harvesting device which is a composite material comprising one or more materials.
12. The method of claim 11,
The electrode
(Pt), gold (Au), silver (Ag), copper (Cu), aluminum (Al), tantalum (Ta), titanium (Ti), palladium (Pd), ruthenium (Ru), tantalum nitride And titanium nitride (TiN).
The method according to claim 5 or 6,
The piezoelectric film array includes:
And an adhesive film to adhere the plurality of piezoelectric films to the surface of the vibrating body.
The method according to claim 5 or 6,
Wherein each of the plurality of piezoelectric films is provided in a state in which a pre-stress is applied so that each of the impact protrusions can be contacted and pressed in advance.
A plurality of piezoelectric films arranged in a matrix form and attached to a surface of a vibrating body; and a piezoelectric film striking structure for generating electrical energy through the piezoelectric film,
The piezoelectric film striking structure includes: a housing attached to a surface of the vibrating body; And
And a striking plate which is embedded with an elastic member between the striking plate and the housing and in which a plurality of striking fins are integrally protruded toward the plurality of piezoelectric films.
A plurality of piezoelectric films arranged in a matrix form and attached to a surface of a vibrating body; and a piezoelectric film striking structure for generating electrical energy through the piezoelectric film,
The piezoelectric film striking structure includes: a housing attached to a surface of the vibrating body; And
A plurality of striking pins individually protruding toward the plurality of piezoelectric films, a front assembly part for housing the plurality of striking pins, a rear assembly part coupled to the front assembly part, and a plurality of striking pins, And a striking plate including an elastic member interposed between the striking plate and the striking plate.
18. The method according to claim 16 or 17,
The striking projection
A piezoelectric energy harvesting device having a hemispherical shape.
18. The method according to claim 16 or 17,
The impact protrusion has a hemispherical shape,
Wherein the facing surfaces of the plurality of piezoelectric films have arcuate surfaces so as to be in close contact with protruding front surfaces of the impact protrusions.
18. The method according to claim 16 or 17,
The striking projection
A piezoelectric energy harvesting device having a square or rectangular cross-sectional shape.
18. The method according to claim 16 or 17,
The plurality of piezoelectric films may be formed of,
The piezoelectric energy harvesting device is provided in a matrix form prepared by dicing after being manufactured in a large area sheet form or in a plurality of arrangements in a set matrix form after each piezoelectric film is individually manufactured.
18. The method according to claim 16 or 17,
The plurality of piezoelectric films may be formed of,
And an electrode provided on at least one side of the upper and lower surfaces of the piezoelectric energy harvesting device.
18. The method according to claim 16 or 17,
The plurality of piezoelectric films may be formed of,
Pb (Zr, Ti) O3, Pb (Zr, Ti) O3, Pb (Zr, Ti) O3 + Pb (Zn, Nb) O3, (Ba, Bi, (Zr, Ti) O 3 + silicone polymer, Pb (Zr, Ti) O 3 + epoxy polymer, or a material selected from the group consisting of NbO 3 - (Li, Na, K) TaO 3, Pb (Zr, Ti) O 3 + PVDF polymer, A piezoelectric energy harvesting device which is a composite material comprising one or more materials.
23. The method of claim 22,
The electrode
(Pt), gold (Au), silver (Ag), copper (Cu), aluminum (Al), tantalum (Ta), titanium (Ti), palladium (Pd), ruthenium (Ru), tantalum nitride And titanium nitride (TiN).
18. The method according to claim 16 or 17,
The piezoelectric film array includes:
And an adhesive film to adhere the plurality of piezoelectric films to the surface of the vibrating body.
18. The method according to claim 16 or 17,
Wherein each of the plurality of piezoelectric films is provided in a state in which a pre-stress is applied so that each of the impact protrusions can be contacted and pressed in advance.
A piezoelectric energy harvesting apparatus as claimed in any one of claims 1, 5, 6, 16, and 17, and a piezoelectric energy harvesting apparatus using electric energy generated by the piezoelectric energy harvesting apparatus, And a sensing unit which detects an environmental condition of the sensing unit.
28. The method of claim 27,
And a wireless transmission / reception unit for wirelessly transmitting the signal detected by the sensing unit to the outside.

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