JP3196549U - Piezoelectric power generation mat - Google Patents

Abstract

A piezoelectric power generation mat in which the luminance of an LED is improved and a piezoelectric power generation mat in which each piezoelectric element does not consume a voltage generated by another piezoelectric element. A control device 6 for a piezoelectric power generation mat is constituted by a voltage doubler rectifier circuit, and a plurality of electrically conductive flexible plates 31b are provided in the piezoelectric power generation unit, and a piezoelectric element 32 is provided on the lower surface of each electrically conductive flexible plate 31b. Are provided one by one. [Selection] Figure 6

Description

  The present invention relates to a mat for lighting an LED using a piezoelectric element.

  Conventionally, a plurality of piezoelectric elements are built in the walking guide mat, and the voltage generated by the impact and vibration associated with the deformation of the piezoelectric element caused by the stepping on the mat by a pedestrian and the return to the shape before the deformation is used. There is something that turns on the LED.

  Patent Document 1 discloses a piezoelectric mat in which a piezoelectric power generation unit in which two piezoelectric unimorphs each having a piezoelectric ceramic plate bonded to an elastic plate are bonded to each other through a spacer so that the surfaces of the piezoelectric ceramic plates face each other is disclosed. doing.

JP 2011-233851 A

  In the conventional walking guide mat, each LED is turned on using the generated voltage due to the deformation and deformation of the piezoelectric element caused by the pedestrian stepping on the mat and the return to the shape before the deformation. I was letting. In this case, the generated voltage was relatively small, and the brightness of each lit LED was also relatively small. As described above, the conventional walking guide mat has a problem that it has only a light that is lit for a moment with low luminance.

  In the conventional walking guide mat, a plurality of piezoelectric elements may be provided on one flexible plate for the purpose of increasing the voltage. However, in this case, there is a problem that the voltage generated by the stressed piezoelectric element is consumed (converted into sound) by other piezoelectric elements not receiving the stress, and the voltage does not increase.

  In addition, the piezoelectric mat disclosed in Patent Document 1 requires two piezoelectric elements on the upper and lower sides for the purpose of increasing power generation efficiency and the like, resulting in a complicated structure and increased cost.

  Accordingly, one of the objects of the present invention is to provide a piezoelectric power generation mat capable of improving the luminance of the conventional walking guide mat or the like as compared with the light of the LED due to the power generation voltage of the piezoelectric element.

  The second object of the present invention is to provide a piezoelectric power generation mat in which the voltage generated by a stressed piezoelectric element is not consumed (converted into sound) by other piezoelectric elements not subjected to stress. That is.

  Another object of the present invention is to provide the above-described piezoelectric power generation mat with a relatively simple structure and at a low cost.

  In order to achieve the above object, a piezoelectric power generation mat according to the present invention includes a bottom plate (1), a spacer (2) disposed on the outer periphery of the bottom plate (1), a deflection plate (31), and the deflection plate ( 31) includes a plurality of piezoelectric elements (32) provided on the lower surface of the piezoelectric power generation unit (3) mounted on the spacer (2), and a notch (43). 31) and a cover (4) provided so as to cover the bottom plate (1), the spacer (2) and the piezoelectric power generation unit (3), and an upper surface from the notch (43). Piezoelectric power generation mat (100) provided with LED unit (5) provided so as to be exposed, and control device (6) connected to each of said piezoelectric power generation unit (3) and said LED unit (5) The control device (6) is a voltage doubler rectifier circuit. Made is characterized in that is.

  Another form of the piezoelectric power generation mat according to the present invention includes a bottom plate (1), a spacer (2) disposed on the outer periphery of the bottom plate (1), an electrically insulating flexible plate (31a), and a plurality of piezoelectric plates. A piezoelectric power generation unit (3 ') mounted on the spacer (2) and a notch (43) provided with an element (32) and disposed on the upper surface of the electrically insulating flexible plate (31a). A cover (4) provided to cover the bottom plate (1), the spacer (2), and the piezoelectric power generation unit (3 ′), and an upper surface exposed from the notch (43). A piezoelectric power generation mat (100 ′) comprising an LED unit (5), and a control device (6) connected to the piezoelectric power generation unit (3 ′) and the LED unit (5), respectively. The piezoelectric power generation unit (3 ′) includes a plurality of electrically conductive flexures. A plate (31b), characterized in that the said piezoelectric element (32) on the lower surface of the electrically conductive deflection plate (31b) are provided one by one.

  According to the present invention, in the first aspect, since the control device is configured by the voltage doubler rectifier circuit, the voltage generated when the piezoelectric element is stepped on is temporarily stored, and then It is possible to improve the brightness of the light of the LED by causing the LED to emit light together with the voltage generated when the piezoelectric element returns to its original shape.

  Further, according to the present invention, in the second aspect, a plurality of electrically conductive deflecting plates are provided, and one piezoelectric element is provided on the lower surface of each electrically conductive deflecting plate. Because it is independent of the piezoelectric element, it is not affected by other piezoelectric elements, and therefore, the voltage generated by the stressed piezoelectric element is consumed (converted into sound) by the other piezoelectric element not receiving the stress. There is nothing.

  In addition, since the present invention does not require two or more piezoelectric elements in the vertical direction, the structure of the piezoelectric power generation mat can be simplified and the cost can be reduced relatively.

FIG. 1a is a plan view showing an example of a piezoelectric power generation mat according to a first embodiment of the present invention. FIG. 1B is a side view showing an example of the piezoelectric power generation mat according to the first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view taken along line II in FIG. FIG. 3 is a schematic cross-sectional view of the piezoelectric power generation mat of the present invention. FIG. 4 is a schematic cross-sectional view of the LED unit of the present invention. FIG. 5a is a diagram illustrating an image of a voltage generated by a piezoelectric element. FIG. 5b is a diagram illustrating an image of a voltage obtained by combining the voltage generated at the time of depression and the voltage generated at the time of recovery according to the first embodiment of the present invention. FIG. 6A is a plan view showing an example of the piezoelectric power generation mat according to the second embodiment of the present invention. FIG. 6 b is a side view showing an example of the piezoelectric power generation mat according to the second embodiment of the present invention. FIG. 7 is an enlarged sectional view taken along line II-II in FIG. 6a. FIG. 8a is a schematic cross-sectional view of a conventional piezoelectric power generation unit. FIG. 8 b is a schematic cross-sectional view of the piezoelectric power generation unit according to the second embodiment of the present invention. FIG. 9a is a diagram illustrating a conventional flexure plate and a piezoelectric element. FIG. 9b is a view showing an electrically insulating flexible plate, an electrically conductive flexible plate and a piezoelectric element according to the second embodiment of the present invention. FIG. 10 is an example of a block diagram of the piezoelectric power generation mat of the present invention. FIG. 11 is an example of a circuit diagram of the piezoelectric power generation mat of the present invention.

  Hereinafter, a piezoelectric power generation mat according to an embodiment of the present invention will be described with reference to the drawings. In all the drawings for explaining the embodiments, common constituent elements are denoted by the same reference numerals, and repeated explanation is omitted.

  FIG. 1a is a plan view showing an example of a piezoelectric power generation mat according to a first embodiment of the present invention. FIG. 1B is a side view showing an example of the piezoelectric power generation mat according to the first embodiment of the present invention. FIG. 2 is an enlarged sectional view taken along line II in FIG. 1a.

  As shown in FIGS. 1 and 2, the piezoelectric power generation mat 100 according to the first embodiment of the present invention is placed on the bottom plate 1, the spacer 2 disposed on the outer periphery of the bottom plate 1, and the spacer 2. The piezoelectric power generation unit 3, the cover 4 that covers the bottom plate 1, the spacer 2, and the piezoelectric power generation unit 3, the LED unit 5 that is provided so that the upper surface is exposed from the notch 43, and the piezoelectric power generation unit 3 and a control device 6 connected to the LED unit 5 respectively. Note that illustration of lead wires connecting them is omitted.

  The bottom plate 1 has, for example, a rectangular shape, and is preferably slightly smaller than the cover 4 so as to be covered by the cover 4 as shown in FIG. As the bottom plate 1, for example, a composite plate in which a core material such as resin is sandwiched between two metal plates can be used. The thickness of the bottom plate 1 is preferably 3 mm, for example.

  The spacer 2 is disposed on the outer periphery of the bottom plate 1. Specifically, for example, the spacer 2 is provided so as to fill the space in the outer peripheral direction covered with the cover 4 from slightly inside the outer peripheral edge of the bottom plate 1 as shown in FIG. However, the spacer 2 is provided with an appropriate recess so that the piezoelectric power generation unit 3, the LED unit 5, and the control device 6 can be arranged. By providing the spacer 2, it is possible to provide a space between the piezoelectric power generation unit 3 and the bottom plate 1, thereby enabling a piezoelectric element 32 constituting the piezoelectric power generation unit 3 described later to bend and promoting power generation. It is. As the material of the spacer 2, a foamed polyethylene material can be used in the same manner as the spacer of the conventional piezoelectric power generation mat. Preferably, a material made of urethane resin such as urethane rubber is used. It is possible to improve durability.

  The piezoelectric power generation unit 3 is placed on the spacer 2 as shown in FIG. The piezoelectric power generation unit 3 includes a bending plate 31 and a plurality of piezoelectric elements 32 provided on the lower surface of the bending plate 31. In the present embodiment, an acrylic protective plate 33 is further provided on the lower surface of the piezoelectric element 32.

  As the bending plate 31, for example, an electrically conductive rectangular plate having a thickness of about 1 mm, specifically, a stainless plate or the like is used.

  The piezoelectric element 32 converts a mechanical input such as vibration or impact into a voltage, and is also referred to as a piezoelectric element. As a material of the piezoelectric body of the piezoelectric element 32, lead zirconate titanate, ceramics, polyvinyl difluoride, or the like can be used. In particular, it is desirable to use lead zirconate titanate having large piezoelectric characteristics. Electrodes (not shown) are provided on the upper and lower surfaces of the piezoelectric element 32, respectively. When the flexible plate 31 is electrically conductive, the electrode on the upper surface side of the piezoelectric element 32 is connected to the control device 6 via the flexible plate 31 by a lead wire or the like. In this case, the upper surface of the flexible plate 31 and the voltage element 32 is joined by a conductive adhesive or the like. The electrode on the lower surface side of the piezoelectric element 32 is connected to the control device 6 via a lead wire (not shown).

  FIG. 3A is a schematic cross-sectional view of a general piezoelectric power generation mat. In the present invention, it is possible to adopt the configuration shown in FIG. 3a, but preferably the piezoelectric power generation unit 3 and the spacer 2 are covered with a seamless coating 34 such as urethane resin as shown in FIG. 3b. Adopt the configuration. Thereby, the strength and waterproofness of the assembly of the piezoelectric power generation unit 3 and the spacer 2 are improved.

  As shown in FIGS. 1 and 2, the cover 4 is disposed on the upper surface of the flexible plate 31 so as to cover the bottom plate 1, the spacer 2, the piezoelectric power generation unit 3, the LED unit 5, and the control device 6. As shown in FIGS. 1 a and 2, the cover 4 includes a rectangular surface portion 41 larger than the bottom plate 1 and the flexible plate 31, and four cover side walls 42 extending obliquely downward from each side of the surface portion 41. It has. The surface portion 41 of the cover 4 is provided with six notches 43 in FIG. The cover 4 is made of urethane resin, for example. Preferably, the upper surface of the surface portion 41 is embossed or pear-finished, and more preferably non-slip finished by fixing the inorganic powder in the step of applying the top coat.

  FIG. 4 is a schematic cross-sectional view of the LED unit 5 of the present invention. The LED unit 5 has a transparent upper end plate 51 made of polyvinyl chloride at the upper end, a blindfold mask plate 52 disposed on the left and right sides of the upper end plate 51 in cross section, and an opening formed by the blindfold mask plate 52. The LED 53, the LED substrate 54, and the LED unit side wall 55 are provided. The space formed by the upper end plate 51 and the LED unit side wall 55 is preferably sealed with a urethane resin 56.

  The control device 6 is connected to the piezoelectric power generation unit 3 and the LED unit 5 by lead wires or the like. In the first embodiment of the present invention, the control device 6 is configured by a voltage doubler rectifier circuit.

  FIG. 5a is a diagram illustrating an image of a voltage generated by a piezoelectric element. A in FIG. 5a indicates a voltage generated when the piezoelectric power generation mat 100 is depressed. Similarly, B indicates a voltage generated when the piezoelectric element 32 returns to its original shape after the piezoelectric power generation mat 100 is depressed. Here, in the conventional piezoelectric power generation mat, the LED 53 emits light when the voltage A and the voltage B are generated, but since the voltages A and B are relatively small, the luminance of the light emitted by the LED 53 is Relatively small.

  FIG. 5b is a diagram illustrating an image of a voltage obtained by combining the voltage generated when the piezoelectric power generation mat 100 is stepped on and the voltage generated when the piezoelectric power generation mat 100 according to the first embodiment of the present invention is restored. In FIG. 5b, B indicates the voltage generated when the piezoelectric element 32 returns to its original shape after the piezoelectric power generation mat 100 is depressed, as in FIG. 5a. In FIG. 5b, A 'indicates a voltage in which the voltage generated when the piezoelectric power generation mat 100 is depressed is stored in the capacitor. In the case of FIG. 5b, since the voltage generated when the piezoelectric power generation mat 100 is stepped on is stored in the capacitor, the LED 53 does not emit light at this time, and the voltage B is restored when the piezoelectric element 32 returns to its original shape after stepping on. LED 53 emits light at a voltage obtained by combining the voltage A ′ and the voltage A ′. Here, the luminance of the emitted light is relatively large, and thus it is desirable because it is visually recognized as if it has been shining for a long time. In the case of FIG. 5b, no light is emitted when the piezoelectric power generation mat 100 is stepped on (no light is emitted only by the voltage A), but only for a moment, and even if the LED 53 emits light by the voltage A, the luminance is small, so this does not emit light. There will be no adverse effects.

  Next, a second embodiment of the present invention will be described. FIG. 6a is a plan view showing an example of a piezoelectric power generation mat 100 'according to the second embodiment of the present invention. FIG. 6b is a side view showing an example of the piezoelectric power generation mat 100 'according to the second embodiment of the present invention. FIG. 7 is an enlarged sectional view taken along line II-II in FIG. 6a. FIG. 8 b is a schematic cross-sectional view of the piezoelectric power generation unit 3 ′.

  The difference between the piezoelectric power generation mat 100 of the first embodiment of the present invention and the piezoelectric power generation mat 100 ′ of the second embodiment is that the structure of the piezoelectric power generation unit is different, and in the second embodiment, the control device 6. Is arbitrarily configured as a voltage doubler rectifier circuit. Therefore, hereinafter, in the description of the second embodiment, differences from the first embodiment will be mainly described, and configurations not particularly mentioned are the same as those in the first embodiment.

  As shown in FIGS. 6 and 8b, the piezoelectric power generation unit 3 'includes an electrically insulating flexible plate 31a, a plurality of piezoelectric elements 32, and a plurality of electrically conductive flexible plates 31b. Each piezoelectric element 32 is provided on the lower surface of each electrically conductive deflecting plate 31b.

  As shown in FIG. 8a, the conventional piezoelectric power generation unit has a structure in which a cover 4, a deflection plate 31, a piezoelectric element 32, and a protection plate 33 are stacked from above. On the other hand, the piezoelectric power generation unit 3 ′ according to the second embodiment of the present invention has a cover 4 at the top, and an electrical insulating property that covers the electrically conductive flexible plate 31b and the piezoelectric element 32 provided on the lower surface thereof. The flexible plate 31 a has a structure arranged under the cover 4.

  As shown in FIG. 8B, the electrically insulating flexible plate 31a overlies the piezoelectric element 32 and the electrically conductive flexible plate 31b. Thereby, water resistance and insulation are improved, and damage due to excessive deformation of the piezoelectric element 32 is effectively reduced. The electrically insulating flexible plate 31a is made of, for example, fiber reinforced plastic (FRP). In this case, it is desirable to provide a passage or the like for inserting the lead wire in the electrically insulating flexible plate 31a so as to cover the lead wire.

  The electrically conductive deflecting plate 31b is provided to perform substantially the same function as the deflecting plate 31 in the first embodiment, whereas in the first embodiment, the deflecting plate 31 is a single sheet. As shown in FIG. 6A, a plurality of electrically conductive flexible plates 31b, specifically, one piezoelectric element 32 is assigned. As the electrically conductive flexible plate 31b, for example, a stainless steel plate having a thickness of 1 mm can be used.

  FIG. 9 is a diagram schematically showing a conventional piezoelectric power generation unit and a piezoelectric power generation unit 3 ′ according to the second embodiment of the present invention.

  FIG. 9a shows a conventional piezoelectric power generation unit, in which a plurality of piezoelectric elements are provided on a single electrically conductive flexible plate. Since the piezoelectric elements are energized with each other, they affect each other. Specifically, as shown in the figure, for example, when power is generated by applying stress to the leftmost piezoelectric element, the rightmost piezoelectric element not receiving stress consumes the voltage generated by the leftmost piezoelectric element ( May be converted to sound). Therefore, in this case, there is a disadvantage that the voltage used for the light emission of the LED 53 decreases or disappears.

  FIG. 9b shows a piezoelectric power generation unit 3 'according to a second embodiment of the present invention. The piezoelectric power generation unit 3 ′ is provided with a single electrically insulating flexible plate 31 a, a plurality of electrically conductive flexible plates 31 b, and a plurality of piezoelectric elements 32, and each electrically conductive flexible plate 31 b has a piezoelectric property. One element 32 is provided. Thus, in this embodiment, since each piezoelectric element 32 is provided independently of the other piezoelectric elements 32, even if a certain piezoelectric element 32 receives power and generates electric power, It is possible to avoid the situation where 32 is consumed.

  In the second embodiment, the control device 6 is not necessarily configured as a voltage doubler rectifier circuit, but is preferably a voltage doubler rectifier circuit as in the first embodiment.

  FIG. 10 is a block diagram of a piezoelectric power generation mat 100 ′ when the control device 6 is configured as a voltage doubler rectifier circuit in the second embodiment of the present invention.

  Each piezoelectric element 32 and the electrically conductive flexible plate 31b constituting the piezoelectric power generation unit 3 ′ are set in combination of one by one, and the control is configured as a voltage doubler rectifier circuit assigned to each set one by one. It is connected to the device 6 by a lead wire. Each control device 6 is connected to all the LED units 5 with lead wires.

  FIG. 11 is a circuit diagram relating to one piezoelectric element 32 when the control device is configured as a voltage doubler rectifier circuit in the second embodiment of the present invention.

  In FIG. 11, PZT1-1 indicates a piezoelectric element 32, which generates power by receiving stress and causes an alternating current to flow on the circuit. The current flowing in the direction of the arrow Y2 (when the piezoelectric power generation mat 100 'is depressed) is stored in the capacitor C1 via the diode D1. On the other hand, the current that flows in the direction of the arrow Y1 (when the piezoelectric power generation mat 100 'is depressed and then returns to its original shape) flows in the direction of the LED unit 5 via the diode D2. At this time, since the voltage stored in the capacitor C1 also flows in the direction of the LED unit 5, the LED 53 can emit light with a larger voltage.

DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Spacer 3 Piezoelectric power generation unit 3 'Piezoelectric power generation unit 31 Deflection plate 31a Electrical insulation deflection plate 31b Electrical conductivity deflection plate 32 Piezoelectric element 33 Protection plate 34 Coating 4 Cover 41 Surface portion 42 Cover side wall 43 Notch portion 5 LED unit 51 Top plate 52 Blindfold mask plate 53 LED
54 LED substrate 55 LED unit side wall 56 Urethane resin 6 Control device 100 Piezoelectric power generation mat 100 ′ Piezoelectric power generation mat

Claims (2)

The bottom plate (1),
A spacer (2) disposed on the outer periphery of the bottom plate (1);
A piezoelectric generating unit (3) comprising a flexible plate (31) and a plurality of piezoelectric elements (32) provided on the lower surface of the flexible plate (31), and placed on the spacer (2);
A cover having a notch (43) and disposed on the upper surface of the flexible plate (31) so as to cover the bottom plate (1), the spacer (2) and the piezoelectric power generation unit (3) ( 4) and
An LED unit (5) provided so that an upper surface is exposed from the notch (43);
A piezoelectric power generation mat (100) comprising a control device (6) connected to the piezoelectric power generation unit (3) and the LED unit (5), respectively.
The piezoelectric power generation mat, wherein the control device (6) comprises a voltage doubler rectifier circuit. The bottom plate (1),
A spacer (2) disposed on the outer periphery of the bottom plate (1);
A piezoelectric power generation unit (3 ′) comprising an electrically insulating flexible plate (31a) and a plurality of piezoelectric elements (32), and placed on the spacer (2);
It has a notch (43) and is disposed on the upper surface of the electrically insulating flexible plate (31a) so as to cover the bottom plate (1), the spacer (2), and the piezoelectric power generation unit (3 ′). Covered cover (4),
An LED unit (5) provided so that an upper surface is exposed from the notch (43);
A piezoelectric power generation mat (100 ′) comprising a control device (6) connected to the piezoelectric power generation unit (3 ′) and the LED unit (5), respectively.
The piezoelectric power generation unit (3 ′) includes a plurality of electrically conductive flexible plates (31b),
A piezoelectric power generation mat, wherein each of the piezoelectric elements (32) is provided on the lower surface of each of the electrically conductive flexible plates (31b).

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