TWI384179B - Road illumination device - Google Patents

Description

Road lighting

The invention relates to a lighting device, in particular to a road lighting device with anti-glare function.

Glare is a kind of light damage, which generally includes direct glare and indirect glare. Direct glare refers to the direct stimulation of the eye from the light emitted by the glare source/illuminator with high brightness or insufficient shielding in the field of view. The glare source illuminant is in the same direction or adjacent direction of the object to be observed. Indirect glare refers to the glare produced by a glare source in a non-observing direction, usually caused by reflected light from a highly smooth surface. As shown in FIG. 1, when the light source 101 is positioned above the human eye 102, the light source 101 causes direct glare to the human eye 102 from a range in which the vertical plane 103 of the human eye 102 is deflected between 45 degrees and 85 degrees.

As shown in FIG. 2, the light emitted by the street lamp 201 is projected toward the road surface centering on itself. In the prior art, the radiation range of the street lamp 201 in the X direction of the vehicle traveling is greater than the radiation range in the Y direction perpendicular to the X direction. In order to effectively improve the light utilization rate of the street lamp 201. However, the radiation range formed by the street lamp 201 in the X direction is symmetrically distributed around the street lamp 201, that is, the radiation angles θ1 and θ2 of the street lamp 201 to the both sides thereof in the X direction are equal, usually θ1 = θ2 = 70 degrees, which will Direct glare is generated to the human eye. Here, the radiation angle may also be referred to as a half-peak side angle, which is an angle obtained by measuring half of the maximum light intensity from the vertical road surface to the left and right sides. That is, the angle between the light emitted by the light source and the vertical line is 50% of the maximum luminous intensity on the plane. Here, see The light distribution curve of the street lamp 201 shown in FIG. 3, the light intensity of the light corresponding to the point A in the figure is 50% of the maximum light intensity of the street lamp 201 in the range of 0 to 90 degrees, and the light intensity of the point B corresponding to the light is the street lamp 201. The maximum light intensity in the range of 0 to 90 degrees, the radiation angle of the street lamp 201 is approximately equal to 70 degrees. It can be seen that the existing street lighting device still causes direct glare to the driver's eyes.

Therefore, it is necessary to provide a road lighting device with anti-glare function.

A road lighting device having an anti-glare function will be described below by way of example.

A road lighting device includes a light source, a power storage device, a solar cell and a light transmissive package. The light source includes at least one light emitting diode and an optical element optically coupled to the at least one light emitting diode, the optical element is configured to deflect light emitted by the at least one light emitting diode toward a lateral direction of the light source The light exits along the extending direction of the road surface, and the angle between the light emitted through the optical element and the road surface is greater than or equal to -30 degrees or less than or equal to +30 degrees. The power storage device is electrically connected to the at least one light emitting diode. The solar cell is electrically connected to the power storage device for directly converting sunlight into electrical energy and storing the electrical energy in the power storage device. The light source and the solar cell are encapsulated in the light transmissive package.

Compared with the prior art, the angle between the light emitted by the road surface illumination device and the road surface is greater than or equal to -30 degrees or less than or equal to +30 degrees, so as not to directly affect the driver of the vehicle. Moreover, the solar cell encapsulated in the light-transmissive package directly converts sunlight into electrical energy and stores the electrical energy in the power storage device, thereby facilitating nighttime power storage. The power supply is provided to the light-emitting diode for use as road lighting, so that the road lighting device has the effect of energy saving and environmental protection.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 4, a road lighting device 10 according to a first embodiment of the present invention is used for illuminating a road surface 11. The lighting device 10 includes a light source 12, a power storage device 13, a solar cell 14, and a light transmission. Package 15.

The light source 12 includes a light emitting diode 121 and an optical element 122.

The light-emitting diode 121 is a white light-emitting diode or a high-power light-emitting diode, and may of course be a light-emitting diode that emits different colors such as red light or blue light.

The optical element 122 is optically coupled to the light emitting diode 121, that is, the light emitted by the light emitting diode 121 directly enters the optical element 122 and is emitted through the optical action of the optical element 122. In the present embodiment, the light source 12 is disposed on the road surface 11 , and the light emitted by the light-emitting diode 121 is emitted upward into the optical element 122. The optical element 122 is used to deflect the light emitted by the light-emitting diode 121 to the light source 12 . The lateral direction and exit along the extending direction X of the road surface 11.

Optical element 122 has a longitudinal axis 1220. Optical element 122 includes a funnel-shaped top surface 1221 and a vertical side wall 1222. The light emitting diode 121 is disposed at a geometric center of the bottom of the optical element 122 opposite to the top surface 1221. The top surface 1221 is a quadric surface. In this embodiment, the top surface 1221 is a parabolic surface. From light The light emitted by the diode 121 is mainly directed toward the top surface 1221, and total internal reflection (TIR) occurs at the top surface 1221 and is emitted through the vertical sidewall 1222 at an angle of almost 90 degrees to the longitudinal axis 1220. Light rays that are directed from the LEDs 121 directly toward the vertical sidewalls 1222 are emitted through the vertical sidewalls 1222 at a slight angle from the vertical direction of the longitudinal axis 1220. Therefore, the light emitted through the optical element 122 may deviate from the extending direction of the road surface 11 by a slight angle, that is, the angle θ between the light emitted through the optical element 122 and the road surface 11 is within a predetermined range, for example, -30 degrees ≦θ. ≦+30 degrees, here, the angle θ refers to the angle between the light emitted through the optical element 122 and the light intensity of 50% of the maximum luminous intensity on the plane and the road surface 11. In addition, a reflective layer 1223 may be disposed on the top surface 1221 of the optical element 122 to further improve the reflection efficiency.

The power storage device 13, such as a battery, is electrically connected to the light emitting diode 121. The power storage device 13 is for storing electrical energy and is capable of supplying power to the light emitting diode 121.

The solar cell 14 is electrically connected to the power storage device 13 for directly converting sunlight into electrical energy and storing the electrical energy in the power storage device 13, thereby facilitating the night power storage device 13 to supply power to the light-emitting diode 121 as Road 11 for lighting purposes.

The light transmissive package 15 is disposed on the road surface 11 , and the light source 12 and the solar cell 14 are covered in the light transmissive package 15 . In the present embodiment, the light transmissive package 15 has a truncated conical profile having a top surface 151 and a side surface 152 surrounding the top surface 151. The light source 12 is located at the bottom of the transparent package 15 , and the solar cell 14 is disposed opposite to the light source 12 at the top of the transparent package 15 and adjacent to the top surface 151 , which is advantageous for the solar cell 14 The absorption of sunlight increases the absorption efficiency of the solar cell 14. The material of the light-transmissive package 15 is mainly made of a material having high hardness and light transmittance, such as tempered glass, quartz, crystal, sapphire, etc., so that the illuminating device 10 can be effectively prevented from being subjected to a large external force. Damage, such as rolling of a vehicle.

In the present embodiment, the light emitted by the light-emitting diode 121 is emitted through the optical element 122 and directly enters the light-transmitting package 15 , and is finally emitted by the light-transmitting package 15 to illuminate the road surface 11 . At the same time, the angle θ between the light emitted through the optical element 122 and the road surface 11 is greater than or equal to -30 degrees or less than or equal to +30 degrees, and the refractive index of the light-transmitting package 15 is greater than 1, so that the light-transmitting package 15 is emitted and The angle θ between the light entering the air and the road surface 11 can still be -30 degrees or more or +30 degrees or less. Therefore, most of the strong light emitted by the road lighting device 10 is directed to the road surface 11 without directly affecting the driver of the vehicle.

In addition, the structure of the optical element included in the light source 12 in the first embodiment is not limited thereto, and other designs may be employed such that the angle θ between the light emitted from the light source 12 and the road surface 11 is within a predetermined range, which will be exemplified below. Describe several sources with different optical components.

Referring to FIG. 5, a light source 32 includes a light emitting diode 321 and an optical element 322 optically coupled to the light emitting diode 321 . Optical element 322 has a longitudinal axis 3220. Optical element 322 includes a funnel-shaped top surface 3221 and a side surface 3222. The light-emitting diode 321 is disposed at a geometric center of the bottom of the optical element 322 opposite the top surface 3221. The top surface 3221 is a curved surface having a plurality of different slope planes. In the present embodiment, the slope of the top surface 3221 is sequentially reduced from the inside to the outside. side Face 3222 is a smooth curved surface. Light rays emitted from the LEDs 321 are mainly directed toward the top surface 3221, and are totally reflected at the top surface 3221 and are emitted at an angle of almost 90 degrees to the longitudinal axis 3220. Light rays that are directed from the LEDs 321 directly toward the vertical side 3222 are also emitted at an angle of approximately 90 degrees to the longitudinal axis 3220. Therefore, most of the light emitted through the optical element 322 is parallel to the extending direction of the road surface 11, and a small portion deviates from the extending direction of the road surface 11 by a slight angle, that is, the angle between the light emitted through the optical element 322 and the road surface θ. In a predetermined range, for example, -25 degrees ≦ θ ≦ + 25 degrees, where the angle θ refers to the angle between the light emitted through the optical element 122 and the light intensity of 50% of the maximum luminous intensity on the plane and the road surface 11 . In addition, a reflective layer 3223 may be disposed on the top surface 3221 of the optical element 322 to further improve the reflection efficiency.

Referring to FIG. 6, a light source 42 includes a light emitting diode 421, an optical element 422 optically coupled to the light emitting diode 421. Optical element 422 has a longitudinal axis 4220. Optical element 422 includes a bottom portion 4221 and a top portion 4222. The bottom portion of the bottom portion 4221 has a recess 4223 for receiving the light emitting diode 421. The outer surface 4224 of the bottom portion 4221 is a smooth curved surface. The top portion 4222 includes a funnel-shaped conical top surface 4225 and a vertical side wall 4226. The light emitted from the light-emitting diode 421 enters the optical element 422 via the bottom surface and the side surface of the recess 4223, and most of the light entering the bottom portion 4221 is emitted through the outer surface 4224 at an angle of almost 90 degrees to the longitudinal axis 4220. Light reflected by the outer surface 4224 may enter the top portion 4222 or be reflected again and exit through the outer surface 4224. Light entering the top portion 4222 is totally reflected at the top surface 4225 and exits through the vertical sidewalls 4226 at an angle of approximately 90 degrees to the longitudinal axis 4220. Therefore, exiting through the optical element 422 Most of the light rays are parallel to the extending direction of the road surface 11, and a small portion deviates from the extending direction of the road surface 11 by a slight angle, that is, the angle θ between the light emitted through the optical element 422 and the road surface 11 is within a predetermined range, for example: -25 degrees ≦ θ ≦ + 25 degrees, where the angle θ refers to the angle between the ray of light emitted through the optical element 422 and the illuminance of 50% of the maximum luminous intensity on the plane, and the road surface 11 . In addition, a reflective layer 4227 may be disposed on the conical top surface 4225 of the top portion 4222 to further improve reflection efficiency.

Referring to FIG. 7, a road lighting device 20 for illuminating a road surface 11 is provided in a second embodiment of the present invention. The lighting device 20 is substantially the same as the road surface lighting device 10 provided in the first embodiment. The light source 12 and the light source 12 are respectively disposed on the substrate 26, and the light-emitting diodes 121 included in the solar cell 14 and the light source 12 are electrically connected to the substrate 26, and the light source 12, the solar cell 14 and the substrate 26 are both covered. In the light transmissive package 15.

Referring to FIG. 8, a road illumination device 30 for illuminating a road surface 11 is provided in a third embodiment of the present invention. The illumination device 30 is substantially the same as the road surface illumination device 20 provided in the second embodiment. The substrate 36 further includes a receiving seat 361 for receiving the power storage device 13. The receiving seat 361 is disposed on a side of the substrate 36 opposite to the light source 12 and can be inserted into the road surface 11 to fix the lighting device 30. The light transmissive package 35 has a dome structure, and the solar cell 14 is located at the bottom of the dome structure to obtain better absorption efficiency.

Referring to FIG. 9, a road lighting device 40 is provided for illuminating a road surface 11 according to a fourth embodiment of the present invention. The lighting device 40 is substantially the same as the road surface lighting device 20 provided by the second embodiment. in The light source 12 and the solar cell 14 are respectively disposed on opposite sides of the substrate 46, and the light source 12 is adjacent to the road surface 11. In the present embodiment, the light source 12 shares the substrate 46 with the solar cell 14, and the space of the illumination device 40 can be saved.

Referring to FIG. 10, a road lighting device 50 according to a fifth embodiment of the present invention is used for illuminating a road surface 11. The lighting device 50 is substantially the same as the road surface lighting device 20 provided by the second embodiment, and the difference is the same. The substrate 56 further includes a receiving seat 561 for accommodating the power storage device 13. The receiving seat 561 is disposed on a side of the substrate 56 opposite to the light source 12 and can be inserted into the road surface 11 to fix the lighting device 50. The light source 12 is disposed at a central position of the light transmissive package 55, and the solar cell 54 and the light source 12 are located on the same side of the substrate 56. The solar cell 54 is disposed around the light source 12 to surround the light source 12, thereby effectively reducing the road surface. The height of the illuminating device 50 relative to the ground 11 reduces the obstruction to the vehicle on the road surface 11 while effectively illuminating the road surface 11.

It can be understood that various other corresponding changes and modifications can be made according to the technical idea of the present invention, for example, the transparent package in all embodiments is designed as a hollow casing. All other related devices are covered, and all such changes and modifications are within the scope of protection of the scope of the invention.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10, 20, 30, 40, 50‧ ‧ ‧ pavement lighting

11‧‧‧ pavement

12, 32, 42‧‧‧ light source

13‧‧‧Power storage device

14, 54‧‧‧ solar cells

15, 35, 55‧‧‧Light Transmissive Encapsulation

121, 321, 421‧‧ ‧Lighting diodes

122, 322, 422‧‧‧ optical components

1220, 3220, 4220‧‧‧ vertical axis

1221, 151, 3221, 4225‧‧‧ top

1222, 4226‧‧‧ vertical sidewall

1223, 3223, 4227‧‧‧reflective layer

152, 3222‧‧‧ side

4221‧‧‧ bottom

4222‧‧‧ top

4223‧‧‧ dent

4224‧‧‧ outer surface

26, 36, 46, 56‧‧‧ substrates

361, 561‧‧‧ 容座

Figure 1 is a schematic diagram showing the principle of glare generation in the prior art.

Fig. 2 is a schematic view showing a state in which a previous street lamp illuminates a road surface.

Figure 3 is a light distribution graph of a prior street lamp.

4 is a cross-sectional view showing a road surface illumination device having a first optical element according to a first embodiment of the present invention.

5 is a schematic cross-sectional view showing a second optical element in the road surface illumination device according to the first embodiment of the present invention.

6 is a schematic cross-sectional view showing a third optical component in a road surface illumination device according to a first embodiment of the present invention.

Figure 7 is a cross-sectional view showing a road lighting device according to a second embodiment of the present invention.

Figure 8 is a cross-sectional view showing a road lighting device according to a third embodiment of the present invention.

Figure 9 is a cross-sectional view showing a road lighting device according to a fourth embodiment of the present invention.

Figure 10 is a cross-sectional view showing a road lighting device according to a fifth embodiment of the present invention.

10‧‧‧Pavement lighting

11‧‧‧ pavement

12‧‧‧Light source

13‧‧‧Power storage device

14‧‧‧Solar battery

15‧‧‧Light Transmissive Encapsulation

121‧‧‧Lighting diode

122‧‧‧Optical components

1220‧‧‧ vertical axis

1221‧‧‧ top surface

1222‧‧‧Vertical sidewall

1223‧‧‧reflective layer

152‧‧‧ side

Claims (8)

A road lighting device comprising: a light source comprising at least one light emitting diode and an optical element optically coupled to the at least one light emitting diode, the optical element for causing the at least one light emitting diode to emit The light deflects toward the side of the light source and exits along the extending direction of the road surface, and the angle between the light emitted through the optical element and the road surface is greater than or equal to -30 degrees or less than or equal to +30 degrees; a power storage device, and the At least one light emitting diode is electrically connected; a solar cell electrically connected to the power storage device for directly converting sunlight into electrical energy and storing the electrical energy in the power storage device; a light transmitting package, The light source and the solar cell are encapsulated in the light-transmissive package; a substrate, the light source is disposed on the substrate, and the solar cell and the light-emitting diode are electrically connected to the substrate, respectively, the light source, the solar cell And the substrate is coated in the transparent package, the light source and the solar cell are respectively disposed on opposite sides of the substrate, and the light And the adjacent road. The road surface lighting device of claim 1, wherein the angle between the light emitted through the optical element and the road surface is greater than or equal to -25 degrees or less than or equal to +25 degrees. The light-emitting package of claim 1, wherein the light-transmissive package has a truncated conical profile having a top surface and a side surface surrounding the top surface, the light source being located in the light-transmissive package bottom of. The road lighting device of claim 1, wherein the substrate further comprises a receiving seat for receiving the power storage device, the receiving seat is disposed on a side of the substrate opposite to the light source and It can be inserted into the road surface to fix the road lighting device. The road lighting device of claim 1, wherein the optical element comprises a funnel-shaped top surface and a vertical side wall, wherein the top surface is a total reflection surface, and the light-emitting diode is disposed at a geometric center of the bottom of the optical element. And opposite the top surface. The road lighting device of claim 1, wherein the optical component comprises a funnel-shaped top surface and a side surface, wherein the top surface is a curved surface having a plurality of different slope planes, and the light emitting diode is disposed on the optical component At the geometric center of the bottom and opposite the top surface, the top surface is used for total reflection of the light incident thereon, the side being a smooth curved surface. The road lighting device of claim 1, wherein the optical component comprises a bottom portion and a top portion, wherein the bottom central portion has a recess for receiving the light emitting diode, and the outer surface of the bottom portion is smoothed The curved surface includes a funnel-shaped conical top surface and a vertical side wall, the conical top surface being a total reflection surface. The road lighting device of claim 1, wherein the optical component further comprises a reflective layer, and the optical component has a funnel-shaped top surface and a sidewall surrounding the top surface, the reflective layer being disposed in the funnel shape On the top.