JP5191289B2 - Road lighting system - Google Patents

Description

  The present invention relates to a road lighting system that is installed on a road shoulder or the like to illuminate a road surface, and more particularly to a road lighting system characterized by a power supply structure.

  Conventionally, commercial power is the most common power source for lighting with street lamps. However, when commercial power is interrupted due to a disaster or to reduce the environmental load, a city powered by solar cells is used. Road lamps are also in practical use. For example, Patent Document 1 discloses a solar power street lamp in which a solar battery is fixed to a casing body, electric power generated by the solar battery is stored in a storage battery, and a light emitting diode is turned on by the electric power from the storage battery. Yes.

JP 2002-015610 A

  However, street lamps using solar cells can be used only at positions where sunlight can reach, and are not suitable for dark areas such as tunnels, so the installation location is limited. In addition, since street lights are lit at night when sunlight cannot be obtained, batteries are needed to store the power generated by solar cells during the day until the night, which increases the size of the street lights. At the same time, the manufacturing cost increases.

  The present invention has been made in view of the above, and provides a road lighting system that does not require a commercial power source or a solar battery, and can perform lighting even in a dark part or at night. For the purpose.

In order to solve such a problem, the road lighting system according to claim 1 includes a lighting device and a power generation unit fixed to a road facility, and the lighting device supports the lighting unit and the lighting unit. A hollow cylindrical lighting device main body, wherein the power generation unit includes a piezoelectric element that generates electric power of the lighting device by vibration of the road equipment, and is fixed inside the lighting device main body of the lighting device , The power of the lighting device is generated by the vibration of the lighting device accompanying the vibration of road equipment.

The road lighting system according to claim 2 is the road lighting system according to claim 1, wherein the power generation unit vibrates in accordance with vibrations of the road equipment, and has flexibility. A plate is provided, and the piezoelectric element is fixed to a side surface of the diaphragm.

According to this invention of Claim 1, a piezoelectric element vibrates and deform | transforms with the vibration of the road equipment produced by driving | running | working of a vehicle, etc., An illuminating device using the electric power discharged from the piezoelectric element Can be lit. For this reason, illumination can be performed even in a dark part or at night without using a commercial power source or a solar battery.
Moreover, it is easy to improve the durability and water resistance of the electric system by arranging the power generation unit inside the lighting device main body.

According to the second aspect of the present invention, by deforming the piezoelectric element via the diaphragm, the deformation of the piezoelectric element can be amplified and the power generation efficiency can be increased.

  Hereinafter, an embodiment of a road lighting system according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a high-speed overpass equipped with a road lighting system. This high-speed overpass 1 is a crossover that constitutes a part of an expressway, and includes a road surface 2 supported by a pier (not shown), and sound insulation walls 3 that are erected on both sides of the road surface 2. A plurality of power generation street lamps 10 are fixed to the sound insulation wall 3 at intervals. A plurality of power generators 30 are fixed to the bottom of the high-speed overpass 1 at intervals.

  First, the power generation street lamp 10 will be described. FIG. 2 is a side view of the power street lamp 10, and FIG. 3 is an enlarged vertical sectional view of the street lamp body 11. As shown in FIG. 2, the power generation street light 10 includes a street light body 11 and a display unit 12. Here, the power generation street lamp 10, the street lamp main body 11, and the display unit 12 respectively correspond to the lighting device, the lighting device main body, and the lighting unit in the claims. The street light main body 11 is a support means for supporting the display unit 12 and is formed in a hollow long cylindrical shape with metal or resin, and its lower end is attached to the sound insulation wall 3 by a known attachment structure (not shown), The display part 12 is attached to the upper end part. As shown in FIG. 3, a plurality of power generation units 20 are provided inside the street lamp main body 11, and the structure of the power generation units 20 will be described later. The display unit 12 incorporates a light source (not shown) such as an incandescent bulb, a fluorescent lamp, or an LED (Liquid Emitting Diode), and the road surface 2 is turned on by lighting the light source using the power generated by the power generation unit 20. Can be illuminated.

  Next, the power generator 30 will be described. FIG. 4 is an enlarged vertical sectional view of the power generation device 30. As shown in FIG. 4, the power generation apparatus 30 includes a plurality of power generation units 20 similar to those provided inside the power generation street lamp 10 inside the unit case 31. The unit case 31 is an attachment means for attaching the power generation device 30 to the high-speed overpass 1, is formed in a hollow box shape with metal or resin, and is attached to the bottom surface of the high-speed overpass 1 by a known attachment structure (not shown). .

  Next, the power generation unit 20 will be described. FIG. 5 is a side view of the power generation unit 20 before deformation of the diaphragm, and FIG. 6 is a side view of the power generation unit 20 when the diaphragm is deformed. The power generation unit 20 includes a diaphragm 21 and a pair of piezoelectric elements 22. The vibration plate 21 is a support that applies stress to the piezoelectric element 22 and also serves as a reinforcing material that reinforces the cracking strength of the piezoelectric element 22 and is formed of a metal plate having flexibility and durability. Although the specific material used for this diaphragm 21 is arbitrary, for example, a stainless steel thin plate can be used. Although the planar shape of the diaphragm 21 is arbitrary, it is preferable that the diaphragm 21 is uniformly deformed with respect to an external force. In the present embodiment, the planar shape of the diaphragm 21 is rectangular. The diaphragm 21 is fixed to the inner wall by welding or the like in a direction orthogonal to the inner wall of the street lamp body 11 or the unit case 31.

  The pair of piezoelectric elements 22 generate electric power of the display unit 12 and are elements that generate electricity when deformed by pressure. For example, piezoelectric ceramics such as barium titanate and zirconia, lithium tantalate (LiTaO 3). ) And other piezoelectric single crystals. Each piezoelectric element 22 has a plate shape, and its planar shape is a rectangular shape shorter than the vibration plate 21, and is fixed to the vibration plate 21 with an adhesive or the like on both surfaces of the vibration plate 21. . The planar arrangement position of the piezoelectric element 22 with respect to the diaphragm 21 is arbitrary, but since the deformation amount at the plane center position of the diaphragm 21 is the largest, it is preferable to arrange the piezoelectric element 22 at the plane center position. In the present embodiment, the piezoelectric element 22 is disposed at a position that is concentric with the diaphragm 21. In addition, by fixing the piezoelectric element 22 to the diaphragm 21 in this way, the piezoelectric element 22 is also arranged in a direction orthogonal to the inner wall of the street lamp body 11 or the unit case 31.

  Although not shown, the piezoelectric element 22 has a plus terminal on one surface and a minus terminal on the other surface, and a plus lead wire connected to the plus terminal and a minus lead wire connected to the minus terminal are drawn out. It is. With respect to the power generation street lamp 10, these lead wires are connected to the display unit 12 through the inside of the street lamp main body 11, whereby electric power is supplied to the display unit 12. Alternatively, with respect to the power generation device 30, these lead wires are drawn out from the unit case 31 and connected to the display unit 12, whereby electric power is supplied to the display unit 12. However, various electric elements such as a known bridge circuit may be disposed between the piezoelectric element 22 and the display unit 12. In addition, you may connect both the piezoelectric element 22 inside the electric power generation street lamp 10 and the piezoelectric element 22 inside the electric power generating apparatus 30 with respect to one display part 12, or only either one is connected. You may connect.

  According to such a road lighting system, the vibration of the vehicle traveling on the road surface 2 is transmitted to the street lamp main body 11 through the sound insulation wall 3, and the vibration of the street lamp main body 11 is transmitted to the diaphragm 21. The diaphragm 21 is deformed. Alternatively, the vibration of the vehicle traveling on the road surface 2 is transmitted to the unit case 31 of the power generation device 30 via the high-speed overpass 1, and the vibration of the unit case 31 is transmitted to the diaphragm 21, so that the diaphragm 21 Deform. Then, the piezoelectric element 22 is deformed along with the deformation of the vibration plate 21, so that the display unit 12 can be turned on by the electric power discharged from the piezoelectric element 22. For this reason, illumination can be performed even in a dark part or at night without using a commercial power source or a solar battery. In particular, by deforming the piezoelectric element 22 via the diaphragm 21, the deformation of the piezoelectric element 22 can be amplified, and the power generation efficiency can be increased. In addition, since all or at least a part of the power supply system including the power generation unit 20, the plus lead wire, and the minus lead wire can be arranged inside the street lamp main body 11 and the unit case 31, durability and water resistance can be easily improved. It is.

  Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. it can. Hereinafter, such a modification will be described.

  The power generation street light 10 is not limited to the sound insulation wall 3 of the high-speed overpass 1, but can be installed at any place where vibrations may occur, and may be installed on the shoulder of a general road or on a road sign post.

  The power generation device 30 may be fixed to an incidental facility of the high speed overpass 1 in addition to the case where it is directly fixed to the high speed overpass 1. As such ancillary equipment, for example, inspection passages installed on the side or below of the high-speed overpass 1, road lighting under the elevated road, various road signs (inside Large traffic signs, internal reflection reflective road signs, etc.), various traffic information provision devices (street information boards, algae information boards, graphic information boards, etc.) installed above and to the side of the road, Ventilation facilities (jet fans) and air conditioning facilities in toll booths installed at toll gates on toll roads. In particular, it is possible to increase power generation efficiency by attaching the power generation device 30 to a facility that increases road vibration such as an inspection passage or a facility that itself generates vibration such as a ventilation facility.

  The power generation unit 20 may be configured to store and discharge current by configuring a circuit together with a commercial power source, a storage battery, or the like, or a known electric circuit such as smoothing with a smoothing element such as a capacitor may be used. Can be applied. Further, the power generation unit 20 may be fixed to the outer wall instead of the inner wall of the street lamp main body 11 or the unit case 31, or the diaphragm 21 is omitted and only the piezoelectric element 22 is attached to the inner wall of the street lamp main body 11 or the unit case 31. It may be fixed directly.

  The road lighting system according to the present invention can be used as a lighting system for illuminating a road surface, and in particular, it can convert a force applied from the outside into electricity to be used as a power source. Therefore, commercial power used as a conventional power source can be used. And is useful for omitting solar cells.

It is a perspective view of the high-speed overpass provided with the road lighting system concerning an embodiment of the invention. It is a side view of a power generation street light. It is an enlarged vertical sectional view of a streetlight main body. It is an enlarged vertical sectional view of a power generator. It is a side view before a diaphragm of a power generation unit is deformed. It is a side view at the time of a deformation | transformation of the diaphragm in an electric power generation unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High speed overpass 2 Road surface 3 Sound insulation wall 10 Power generation street light 11 Street light main body 12 Display part 20 Power generation unit 21 Diaphragm 22 Piezoelectric element 30 Power generation device 31 Unit case

Claims (2)

It has a lighting device and a power generation unit that are fixed to road equipment,
The lighting device includes a lighting unit and a hollow cylindrical lighting device body that supports the lighting unit,
The power generating unit has a piezoelectric element which generates power of the lighting device by the vibration of the road facilities, it is fixed to the inside of the lighting device main body of the lighting device, the lighting device due to vibration of the road facilities Generating power of the lighting device by vibration;
A lighting system for roads. The power generation unit vibrates with the vibration of the road equipment, and includes a flexible diaphragm.
Fixing the piezoelectric element to a side surface of the diaphragm;
The road illumination system according to claim 1.

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