JPH04329204A - Street lamp - Google Patents

Abstract

PURPOSE:To lighten the road surface at a high uniformity ratio of illuminance, and shield the light to be leaked to the outside of the road efficiently. CONSTITUTION:A street lamp comprises a lighting fitting body 1, of which front surface is opened, two light emitting tubes 8, 9 installed inside of the lighting fitting main body 1 through a socket 4, a lamp outer tube 10 for housing the light emitting tubes 8, 9, and a reflecting plate 11 for covering a part of the lamp outer tube 10. Two light emitting tubes 8, 9 are located so as to cross each other.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road light installed along a road to illuminate the road surface.

0002

2. Description of the Related Art Road lights are attached to the tops of pillars erected along roads, and illuminate a wide area of the road surface. HID lamps are often used as arc tubes for this type of road lights, and if the power supply is interrupted, the lamps will not be re-lit instantly due to the high temperature during lighting. In order to solve this problem, it is known to provide two arc tubes of an HID lamp and turn on only one of the arc tubes. In this way, when the power supply is interrupted and the light is turned on again, the other low-temperature arc tube that was not lit can be lit within a short time. Furthermore, by providing a road light with two arc tubes and lighting only one of them, the cycle of lamp replacement can theoretically be nearly doubled, and the efficiency of maintenance work can be improved.

0003

[Problems to be Solved by the Invention] However, in the past, two arc tubes were arranged in parallel, so in a certain direction, the light emitted from the lighted arc tube was blocked by the light emitted from the lighted arc tube. Forms shadows and affects light distribution,
There was a problem in that the uniformity of road lighting was reduced.

On the other hand, the arc tube is usually housed within a cylindrical lamp outer tube, and by frosting the lamp outer tube, it is possible to reduce the formation of shadows caused by one of the lamps. There was a risk that the light would be scattered and the light emitting area would become larger, causing the light to leak outside the road.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a road light that can illuminate a road surface with a high degree of uniformity and that can efficiently block light leaking outside the road. With the goal. [Structure of the invention]

00
06]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a lamp main body with an open front surface, a plurality of arc tubes disposed within the lamp main body, and a plurality of arc tubes arranged in the lamp main body. This road light has a lamp outer tube to be housed and a reflection plate covering a part of the outer periphery of the lamp outer tube, and is characterized in that the plurality of light emitting tubes are arranged to intersect with each other.

Another feature of the lamp is that the outer bulb of the lamp is made of transparent glass.

[0008]

[Operation] By arranging the two arc tubes so as to cross each other as described above, the light emitted from all angles in the circumferential direction of the lit arc tube is completely absorbed by the unlit arc tube. There will be no more blocking. As a result, uneven light distribution of the arc tube is reduced and highly uniform illumination can be achieved.

Furthermore, by forming the lamp outer tube that covers the arc tube with transparent glass, the light emitting area from the lamp outer tube becomes smaller, and light leaking outside the road can be efficiently blocked.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the road light according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an embodiment of the present invention. An opening is formed in the lower surface of a lamp body 1 formed in the shape of a box, and a transparent front globe is formed in this opening. 2
is provided. A socket 4 is attached to an inner wall 3 within the lamp body 1. A lamp outer tube 10 made of transparent glass and formed into a cylindrical shape is attached to the socket 4. Inside this lamp outer tube 10 is a pair of conductive wires 5 serving as both poles.
, 6 are arranged. The ends of the conductive wires 5 and 6 are insulating members 7
The conductive wires 5 and 6 are connected to both poles of a pair of arc tubes 8 and 9, respectively. The arc tubes 8 and 9 are arranged to cross each other. For example, when viewed from the width direction of the road, they do not intersect, but when viewed from the direction perpendicular to the width of the road, they intersect. However, the present invention is not limited to this, and it may be a road, or may intersect when viewed from both directions.

A reflecting plate 11 is provided on the upper outer periphery of the lamp outer bulb 10 in the figure, and reflects the light emitted from the arc tubes 8 and 9 toward the front globe 2.

Next, the operation of the road light constructed as described above will be explained. Since the two arc tubes 8 and 9 cross each other, the light emitted from the lit arc tube 8 or 9 is
At any angle in the circumferential direction of the arc tube, it is not completely obstructed by the arc tube 9 or 8 which is turned off. Therefore, uneven light distribution is reduced and illumination with a high degree of uniformity can be performed.

[0014] Also, a lamp outer tube 1 that houses the arc tubes 8 and 9.
By forming 0 with transparent glass, the light emitted from the arc tubes 8 and 9 travels straight to the outside. Therefore, the light emitting area is smaller than that of a frosted lamp outer bulb, and excess light leaking outside the road can be efficiently blocked.

Note that the number of arc tubes may be two or more.

[0016]

As described above, according to the road light of the present invention, since the arc tubes are arranged to intersect with each other, unevenness in light distribution is reduced and highly uniform illumination can be achieved. Furthermore, since the lamp outer bulb is made of transparent glass, the light emitting area can be reduced and excess light leaking outside the road can be efficiently blocked.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of a road light of the present invention.

[Explanation of symbols]

1...Lamp body 4...Socket 8, 9... Arc tube 10... Lamp outer tube 11...Reflector

Claims (2)

[Claims] Claim 1: A lamp body with an open front, a plurality of arc tubes disposed within the lamp body, a lamp outer tube housing the arc tubes, and a part of the outer periphery of the lamp outer tube. What is claimed is: 1. A road light comprising a reflector covering a plurality of light emitting tubes, the plurality of light emitting tubes being arranged to intersect with each other. 2. The road light according to claim 1, wherein the lamp outer bulb is made of transparent glass.