JPH1027508A - In-tunnel lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To illuminate a predetermined area, as determined from the entrance of a tunnel, with brightness proportional to that immediately in front of the tunnel entrance during the daytime, by installing a main illumination along almost the entire length of the tunnel and an auxiliary illumination at both end portion of the tunnel. SOLUTION: At night, only a main illumination 3 with a commercial power supply is turned on, while an auxiliary illumination 5 powered by a solar battery is not. As the sun rises in the morning, a solar-battery module 6 starts generating power according to the brightness of the sun, and the auxiliary illumination 5 powered by it is turned on. When it is fine, the auxiliary illumination 5 operates at rated power, supplying sufficient brightness into a tunnel 1. When it is cloudy, the solar light decreases, and the output of the module 6 and hence the illuminance of the auxiliary illumination 5 decrease accordingly, but since it is dark outside, sufficient illuminance is maintained for humans passing through the tunnel to adapt their eyes to the brightness inside. Also when the rainy or cloudy weather has improved abruptly, the output of the module 6 is instantaneously restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device in a tunnel for illuminating the inside of a tunnel with more appropriate brightness.

[0002]

2. Description of the Related Art Conventionally, lighting in a tunnel through which bicycles pass is carried out by illuminating a wall or the like with one or more rows of lighting devices which are operated at a required capacity of ordinary commercial power at night over almost the entire length of the tunnel. This was commonly done by placing. In this case, the inside of the tunnel is illuminated almost uniformly over its entire length with the brightness required during nighttime operation.

[0003] When driving in a tunnel during the daytime, until the driver's eyes adjust to the brightness inside the tunnel, that is, a predetermined section from the tunnel entrance is brighter than the center of the tunnel. It is desirable that
It is said that the brightness is ideally proportional to the brightness immediately before the entrance of the tunnel.

[0004]

However, in the above conventional example, since the inside of the tunnel is constantly illuminated with substantially uniform brightness, the above demand cannot be met.
Lack of lighting at the tunnel entrance, especially during daytime operation,
There was a problem that the driver deliberately slowed down just before the tunnel, which could lead to traffic congestion.

[0005] It is conceivable to solve the above problem by providing a lighting device having a scale that is supposed to be clear during the daytime. However, installing such a large-scale facility is difficult at night or in cloudy weather. Sometimes unnecessary lighting is performed, which is not only uneconomical, but also causes problems such as being too bright at night to make driving difficult.

Moreover, the brightness immediately before the entrance of the tunnel varies greatly depending on the day and night, the time during the day and the time, and even at the same time between cloudy weather and fine weather. Even if you turn off some lights at night by setting up, etc., the timer can not follow the change of weather during the day, and also install a pyranometer etc. and try to dimming the output as a signal Then, there arises a problem that not only the structure is complicated but also the control system becomes considerably complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an economical and relatively simple configuration. In the daytime, a predetermined section from the tunnel entrance is proportional to the brightness immediately before the tunnel entrance. An object of the present invention is to provide a lighting device in a tunnel capable of lighting with brightness.

[0008]

SUMMARY OF THE INVENTION A lighting device in a tunnel according to the present invention is an auxiliary device in which the brightness of illumination changes depending on the amount of solar radiation from a solar cell, in addition to the main lighting using commercial power. Lighting is provided, wherein the main lighting is provided over substantially the entire length of the tunnel, and the auxiliary lighting is provided at both ends of the tunnel.

According to the present invention constructed as described above, a predetermined section from the entrance (or exit) of the tunnel can be provided during the daytime by the main illumination and the light auxiliary illumination powered by the solar cell installed at both ends of the tunnel. It can be illuminated with a brightness that is brighter than the center of the tunnel and that is appropriate for the amount of solar radiation.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, a tunnel lighting device according to the present invention uses a main light 3 which is installed on the inner wall 2 of a tunnel 1 over substantially the entire length of the tunnel 1 and illuminates the inside of the tunnel 1 using commercial power. Is provided. This main lighting 3
Are connected to a commercial power supply 4 so as to illuminate the inside of the tunnel 1 with necessary brightness during nighttime operation, and are provided in three rows in the figure.

In addition to the main lighting 3, an auxiliary lighting 5 is provided which uses a solar cell as a power source to change the brightness of the lighting depending on the amount of solar radiation. At both ends excluding the part, two rows are provided in the drawing.

That is, the auxiliary lighting 5 is lit by an AC-converted current via a DC-AC inverter 7 using an output from the solar cell module 6 as a power supply, and the output of the solar cell module 6 is turned on when the weather is fine. The rated output of the auxiliary lighting 5 connected thereto is set. That is, for example, 100 V-1 A (100
When the solar cell module 6 that outputs W) is used, the auxiliary lighting 5 such as a 100V-1A (100W) light bulb is used.

That is, when the auxiliary lighting 5 and the solar cell module 6 having the above-described outputs are used, the auxiliary lighting (light bulb) 5 shines at the original brightness of 100 W in fine weather.
If it is cloudy and the output power of the solar cell module 6 is reduced to, for example, 0.5 A, the auxiliary lighting (bulb) 6 has a brightness of 50 W. In addition, since the solar cell does not operate at night, the auxiliary lighting 5 is not turned on.

Next, the operation of the tunnel lighting device having the above configuration will be described. At night, only the main lighting 3 powered by commercial power is turned on, and the auxiliary lighting 5 powered by a solar cell is not turned on because the solar cell is not operating. Then, in the morning, when the sun rises, the solar cell module 6 starts power generation according to the brightness, and the auxiliary lighting 5 using this as a power source is turned on.

Here, when the weather is fine, the auxiliary lighting 5 operates at the rated output and supplies sufficient brightness inside the tunnel 1. In cloudy weather, the sunlight decreases, so that the output of the solar cell module 6 decreases and the illuminance of the auxiliary lighting 5 also decreases, but passes through the tunnel 1 because the outside is dark. Illumination sufficient for the human eye to adapt to its internal brightness is maintained.

Even when the weather suddenly recovers from rainy or cloudy weather, the output of the solar cell module 6 recovers instantaneously. It will be brighter.

Therefore, the main lighting 3 which is operated by the ordinary commercial power of the required capacity at night is provided over the entire length of the tunnel 1, and further, on a sunny day, the eyes of humans passing through the tunnel 1 are inside the tunnel. By installing auxiliary lights 5 at both ends of the tunnel 1 which are powered by a solar cell having a capacity necessary to provide sufficient illuminance to adapt to the brightness of the tunnel, normal commercial power is used at night. Only the main light 3 is turned on,
In a sunny day, the auxiliary light 5 powered by a solar cell is also turned on in addition to the above, so that the human eyes passing through the tunnel 1 have sufficient illuminance to adapt to the brightness inside the tunnel. You can do so.

In addition, in cloudy weather, the output current of the solar cell module 6 decreases, so that the illuminance of the auxiliary lighting 5 powered by the solar cell decreases substantially in proportion to the external brightness. , Exterior brightness and tunnel 1
The difference in brightness at the entrance can be automatically made substantially constant without using a device such as a sensor.

The energy of the solar cell is obtained from sunlight, and the auxiliary lighting uses clean and economical energy. Furthermore, there is generally a space above the tunnel entrance where a solar cell module is installed, and it is not generally necessary to consider where to install the solar cell module.

In the above-described embodiment, an example has been described in which a brightness equivalent to the brightness in fine weather is obtained at the tunnel entrance. However, it is not always possible to obtain 100% of the brightness in fine weather. Is also good. 80% brightness or 5
Even if the brightness is 0%, it is needless to say that it is included in the gist of the present invention, and the present invention is not limited to the above embodiment.

[0022]

As described above, according to the present invention, a predetermined section from the entrance (or exit) of the tunnel can be provided at daytime by the main lighting and the light-assisted lighting powered by the solar cell installed at both ends of the tunnel. Brighter than the center of the tunnel,
In addition, it can illuminate with the appropriate brightness according to the amount of solar radiation, thereby eliminating unnecessary lighting at night and using clean and free solar energy for daytime lighting. This can be economical. Moreover, with a relatively simple configuration, it is possible to automatically change the illuminance and maintain sufficient illuminance for human eyes to adapt to the brightness inside.

As a result, the change in brightness felt by the driver at the entrance of the tunnel is reduced, accidents are prevented, and safe traffic can be contributed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a lighting device in a tunnel according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 tunnel 2 wall 3 main lighting 5 auxiliary lighting 6 solar cell module 7 DC-AC inverter

Continued on the front page (72) Inventor Hiroshi Nambu 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation

Claims (1)

[Claims] 1. In addition to a main light using commercial power, an auxiliary light whose brightness changes according to the amount of solar radiation from a solar cell is provided by using a solar cell as a power source, and the main light is provided over substantially the entire length of the tunnel. A lighting device in a tunnel, wherein the auxiliary lighting is provided at both ends of the tunnel.