JP4400359B2 - Road lighting system, road lighting method and road lighting device - Google Patents

Road lighting system, road lighting method and road lighting device Download PDF

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JP4400359B2
JP4400359B2 JP2004223050A JP2004223050A JP4400359B2 JP 4400359 B2 JP4400359 B2 JP 4400359B2 JP 2004223050 A JP2004223050 A JP 2004223050A JP 2004223050 A JP2004223050 A JP 2004223050A JP 4400359 B2 JP4400359 B2 JP 4400359B2
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lamp
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巧 小川
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iwasakidenki
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting

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Description

本発明は、道路照明における道路照明システム、道路照明方法及び道路照明装置に関する。   The present invention relates to a road lighting system, a road lighting method, and a road lighting device in road lighting.

従来から、道路照明においては、道路照明装置として、灯具をポールの頂部に支持してなる道路照明装置が用いられており（例えば、特許文献１参照）、このような道路照明装置が道路に沿って所定間隔で配置されている。   Conventionally, in road lighting, a road lighting device in which a lamp is supported on the top of a pole has been used as a road lighting device (see, for example, Patent Document 1). Are arranged at predetermined intervals.

ところで、道路照明においては、一般に、自動車運転者に対して十分な視認環境を実現するために、達成すべき指標値として、平均輝度ＬAVE≧１ｃｄ／ｍ2、総合均斉度ＵO≧０．４、車軸線均斉度Ｕl≧０．７といった指標値が設定されている。
特開２０００−２２２９１１号公報 By the way, in road lighting, in general, in order to realize a sufficient visual recognition environment for an automobile driver, as an index value to be achieved, an average luminance L AVE ≧ 1 cd / m 2 and a total uniformity U O ≧ 0. 4. An index value such as the axle line uniformity U 1 ≧ 0.7 is set.
JP 2000-222911 A

しかしながら、従来の道路照明装置においては、運転者に対する十分な視認性を維持しつつ、道路に設置する道路照明装置の灯数を減らすことはできなかった。詳述すると、例えば、従来の構成の道路照明装置を用いた場合に、灯数を減らしてしまうと、道路照明装置間の略中央付近が暗くなってしまい、道路における平均輝度や総合均斉度、車線軸均斉度といった値が低下し、十分な視認性を維持できなくなってしまう。   However, in the conventional road lighting device, it was not possible to reduce the number of lights of the road lighting device installed on the road while maintaining sufficient visibility for the driver. In detail, for example, when using a road lighting device of a conventional configuration, if the number of lights is reduced, the vicinity of the approximate center between the road lighting devices becomes darker, the average brightness and overall uniformity on the road, A value such as lane axis uniformity decreases, and sufficient visibility cannot be maintained.

本発明は、上述した事情に鑑みてなされたものであり、十分な視認性を維持しつつ灯数を減らすことのできる道路照明システム、道路照明方法方法及び道路照明装置を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a road lighting system, a road lighting method method, and a road lighting device that can reduce the number of lights while maintaining sufficient visibility. To do.

上記目的を達成するために、本発明は、ポールの頂部に灯具を取り付けられた道路照明装置が道路の路肩に、当該道路に沿って所定の間隔で配置され、当該道路を連続照明する道路照明システムにおいて、前記灯具を約７０°〜７５°の最大光度角鉛直角を有するように構成すると共に、隣り合う道路照明装置同士の略中間点を前記道路の幅員方向に横断する横断線の中点での輝度を達成すべき平均輝度とし、該横断線上での輝度を前記道路照明装置が配置された側を基準に幅員方向に沿って減少させると共に、前記横断線を基準にして自動車の走行方向と対向する方向に沿って路面輝度を減少させ、前記走行方向に沿って路面輝度を増加させるように前記灯具を構成したことを特徴とする。 In order to achieve the above object, the present invention provides a road lighting device in which a road lighting device having a lamp attached to the top of a pole is arranged on the shoulder of the road at predetermined intervals along the road, and continuously illuminates the road. In the system, the lamp is configured to have a maximum luminous intensity vertical angle of about 70 ° to 75 °, and a midpoint of a transverse line that crosses a substantially middle point between adjacent road lighting devices in the width direction of the road. The luminance on the crossing line is reduced along the width direction with respect to the side on which the road lighting device is disposed, and the driving direction of the automobile is based on the crossing line. The lamp is configured to decrease the road surface brightness along the direction opposite to the road surface and increase the road surface brightness along the traveling direction.

また本発明は、上記発明において、前記ポールの高さＨと、前記道路照明装置の配置間隔Ｓとの比がＳ／Ｈ＝４．５〜５になるように前記道路照明装置の各々を前記道路に沿って配置したことを特徴とする。   Further, the present invention is the above invention, wherein each of the road lighting devices is set such that a ratio of a height H of the pole and an arrangement interval S of the road lighting devices is S / H = 4.5-5. It is arranged along the road.

また本発明は、上記発明において、前記横断線上の総合均斉度を０．４以上とし、前記道路の車線軸均斉度を０．７以上としたことを特徴とする。 The present invention is characterized in that, in the above invention, the overall uniformity on the crossing line is 0.4 or more, and the lane axis uniformity of the road is 0.7 or more.

また本発明は、上記発明において、前記灯具は、光源と、前記光源が内部に配置されるカップ形状の反射板とを備え、前記光源を、光中心が深くなるように前記反射板の内部に配置したことを特徴とする。   Further, the present invention is the above invention, wherein the lamp includes a light source and a cup-shaped reflecting plate in which the light source is disposed, and the light source is disposed inside the reflecting plate so that the optical center is deep. It is arranged.

また本発明は、上記発明において、前記反射板の開口端に内側に向かって縮径するアンダーカット形状を設けたことを特徴とする。   Moreover, the present invention is characterized in that, in the above-mentioned invention, an undercut shape having a diameter reduced toward the inside is provided at an opening end of the reflecting plate.

また上記目的を達成するために、本発明は、ポールの頂部に灯具を取り付けられた道路照明装置を、道路の路肩に当該道路に沿って所定の間隔で配置して、当該道路を連続照明する道路照明方法において、前記灯具の最大光度角鉛直角を約７０°〜７５°とすると共に、前記灯具の配光を、隣り合う道路照明装置同士の略中間点を前記道路の幅員方向に横断する横断線の中点での輝度を達成すべき平均輝度とし、該横断線上での輝度を前記道路照明装置が配置された側を基準に幅員方向に沿って減少させると共に、前記横断線を基準にして自動車の走行方向と対向する方向に沿って路面輝度をなだらかに減少させ、前記走行方向に沿って路面輝度をなだらかに増加させるようにしたことを特徴とする。 In order to achieve the above object, the present invention continuously illuminates the road by arranging a road lighting device having a lamp attached to the top of the pole at a predetermined interval along the road on the shoulder of the road. In the road lighting method, the maximum luminous intensity vertical angle of the lamp is set to about 70 ° to 75 °, and the light distribution of the lamp is traversed in the width direction of the road at a substantially middle point between adjacent road lighting devices. The brightness at the midpoint of the crossing line is the average brightness to be achieved, the brightness on the crossing line is reduced along the width direction with respect to the side where the road lighting device is disposed, and the crossing line is used as a reference. The road surface brightness is gradually decreased along the direction opposite to the traveling direction of the automobile, and the road surface brightness is gradually increased along the traveling direction.

本発明によれば、十分な視認性を維持しつつ灯数を減らすことが可能となる。   According to the present invention, it is possible to reduce the number of lamps while maintaining sufficient visibility.

以下図面を参照して、本発明の実施の形態について説明する。図１は、本実施の形態に係る道路照明装置１と、当該道路照明装置１が設置される道路２とを模式的に示す図である。図１に示すように、道路照明システム１００は、道路幅Ｂが例えば７メートルの道路２の片側の路肩に、当該道路２に沿って所定の間隔（スパン）Ｓで配置される複数の道路照明装置１を備え、これらの道路照明装置１により、道路２の連続照明を行っている。道路照明装置１は、灯具３がポール（支柱）４の頂部に固定されて構成され、灯具３が備える光源としてのランプには、従来と同等ものが用いられている。また、灯具３の反射板には、道路２の走行方向において灯具３を中心に対称な配光特性を有するものが用いられている。これらランプや反射板等の具体的な構成については後に詳述することにする。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a road lighting device 1 according to the present embodiment and a road 2 on which the road lighting device 1 is installed. As shown in FIG. 1, the road lighting system 100 includes a plurality of road lights arranged at predetermined intervals (spans) S along the road 2 on the shoulder of one side of the road 2 having a road width B of 7 meters, for example. The apparatus 1 is provided, and the road 2 is continuously illuminated by these road illumination apparatuses 1. The road lighting device 1 is configured by fixing a lamp 3 to the top of a pole (post) 4, and a lamp as a light source provided in the lamp 3 is the same as a conventional lamp. In addition, a reflector having a light distribution characteristic that is symmetrical about the lamp 3 in the traveling direction of the road 2 is used for the reflector of the lamp 3. Specific configurations of these lamps and reflectors will be described in detail later.

本実施の形態では、道路照明装置１のポール４の高さ（灯具３の配置高さ）Ｈを例えば１０メートルとしつつ、Ｓ／Ｈ比が約５となるように、道路照明装置１の各々を約５０メートルのスパンＳで配置している。すなわち、本実施の形態では、Ｓ／Ｈ比が約３．５程度である従来の一般的な道路照明よりも広スパンで道路照明装置１を配置している。このように、道路照明装置１を広スパンで配置した場合、平均輝度ＬAVE≧１ｃｄ／ｍ2、総合均斉度Ｕ0≧０．４、車軸線均斉度Ｕl≧０．７といった、自動車等の運転者にとって十分な視認性を確保するための指標値の維持が懸念されるところではあるが、本実施の形態では、道路照明装置１の配光を次のようにすることで、これらの指標値を維持することを可能としている。 In the present embodiment, each of the road lighting devices 1 is set so that the S / H ratio is about 5 while the height H of the pole 4 (the arrangement height of the lamp 3) H of the road lighting device 1 is 10 meters, for example. With a span S of about 50 meters. That is, in the present embodiment, the road lighting device 1 is arranged with a wider span than conventional general road lighting having an S / H ratio of about 3.5. As described above, when the road lighting device 1 is arranged with a wide span, an automobile such as an average luminance L AVE ≧ 1 cd / m 2 , an overall uniformity U 0 ≧ 0.4, and an axle line uniformity U 1 ≧ 0.7. However, in the present embodiment, the light distribution of the road lighting device 1 is set as follows by maintaining the index value for ensuring sufficient visibility for the driver of the vehicle. It is possible to maintain the index value.

すなわち、第１点目として、灯具３の最大光度角鉛直角θを従来のものよりも大きくすると共に、第２点目として、隣り合う２つの道路照明装置１の中間を道路２の幅員方向に横断する横断線Ｃ（図２参照）上において、上記の平均輝度ＬAVE、総合均斉度Ｕ0を達成するように配光を決定すると共に、当該横断線Ｃを基準にして自動車の走行方向と対向する方向（図中矢印Ｘで示す）に沿って路面輝度をなだらかに減少させ、自動車の走行方向に沿った方向（図中矢印Ｙで示す）では路面輝度をなだらかに増加させるようにしている（図４参照）。 That is, as the first point, the maximum luminous intensity vertical angle θ of the lamp 3 is made larger than the conventional one, and as the second point, the middle of the two adjacent road lighting devices 1 is arranged in the width direction of the road 2. On the crossing line C (see FIG. 2) that traverses, the light distribution is determined so as to achieve the above average luminance L AVE and overall uniformity U 0 , and the direction of travel of the vehicle with respect to the crossing line C as a reference. The road surface brightness is gently decreased along the facing direction (indicated by the arrow X in the figure), and the road surface brightness is gently increased in the direction along the vehicle traveling direction (indicated by the arrow Y in the figure). (See FIG. 4).

上記第１点目について詳述すると、一般に、道路照明装置１のスパンＳを広げると、上記横断線Ｃ付近での路面輝度が低下して、総合均斉度や車線軸均斉度が低下することになる。そこで、灯具３の最大光度角鉛直角θを、約７０°〜７５°程度にし、従来のものよりも最大光度角鉛直角を大きくすることで、道路２の走向方向に沿って照射光をより遠方まで到達させるようにすることで、照射光を横断線Ｃまで到達可能にし、当該横断線Ｃ付近での路面輝度を向上させることが可能となる。このとき、最大光度角鉛直角θに割り当てられる光度は、実現すべき横断線Ｃでの路面輝度等により規定される。   The first point will be described in detail. Generally, when the span S of the road lighting device 1 is widened, the road surface brightness near the crossing line C is reduced, and the overall uniformity and the lane axis uniformity are reduced. Become. Therefore, the maximum luminous intensity angle vertical angle θ of the lamp 3 is set to about 70 ° to 75 °, and the maximum luminous intensity angle vertical angle is made larger than that of the conventional one, so that the irradiation light is further increased along the running direction of the road 2. By making it reach far, irradiation light can reach the crossing line C, and the road surface brightness near the crossing line C can be improved. At this time, the light intensity assigned to the maximum light intensity angle vertical angle θ is defined by the road surface brightness at the transverse line C to be realized.

ところで、上記のように灯具３の最大光度角鉛直角θを大とすることで、横断線Ｃ付近での照度を高めることができるものの、最大光度角鉛直角θを大とした場合、特に、当該最大光度角鉛直角θでの光度を上げた場合には、これに伴って道路２の輝度分布等が不適切になるなどして、グレア（ＴＩ値）が増大することになる。また、上記第１点目で述べた構成にしただけでは、上記の平均輝度ＬAVE、総合均斉度Ｕ0、車軸線均斉度Ｕlといった指標値を達成できるとは限らない。 By the way, although the illuminance near the transverse line C can be increased by increasing the maximum luminous intensity angle vertical angle θ of the lamp 3 as described above, especially when the maximum luminous intensity angle vertical angle θ is increased, When the luminous intensity at the maximum luminous intensity angle vertical angle θ is increased, the luminance distribution of the road 2 becomes inappropriate and the glare (TI value) increases accordingly. Further, the index values such as the average luminance L AVE , the overall uniformity U 0 , and the axle line uniformity U 1 are not always achieved by the configuration described in the first point.

そこで、グレアを抑制しつつ、上記の平均輝度ＬAVE、総合均斉度Ｕ0、車軸線均斉度Ｕlといった指標値を達成すべく、隣り合う道路照明装置１間の道路区間における輝度分布を上記第２点目で述べた輝度分布となるように、道路照明装置１の灯具３の各々の配光を制御している。 Therefore, in order to achieve the index values such as the above average luminance L AVE , total uniformity U 0 , and axle line uniformity U l while suppressing glare, the luminance distribution in the road section between the adjacent road lighting devices 1 is described above. The light distribution of each lamp 3 of the road lighting device 1 is controlled so that the luminance distribution described in the second point is obtained.

この第２点目の構成についてより詳細に説明する。図２に示すように、２つの隣り合う道路照明装置１の間の道路区間を、走行方向に沿って幅ｈで等間隔に１０個に分割すると共に、幅員方向に沿って幅ｉで等間隔に１０個に分割した場合の各分割点での輝度を考える。このとき、２つの道路照明装置１の中間を、道路２の幅員方向に横断する個所を上記の横断線Ｃと定義する。また、横断線Ｃから見て走行方向と反対方向（矢印Ｘ）に位置する各横断線に対して、横断線Ｃを基準にして順にｍ＝−１、ｍ＝−２、・・・、ｍ＝−５と番号を付すと共に、横断線Ｃから見て走行方向（矢印Ｙ）に位置する各横断線には、順に、ｍ＝１、ｍ＝２、・・・、ｍ＝５と番号を付すことにする。また、道路２の幅員方向を分割する分割線に対しては、道路照明装置１が配置されている側から順に、ｎ＝１、ｎ＝２、・・・、ｎ＝１０の番号を付すことにする。各分割点の座標を（ｍ、ｎ）と表記し、また、分割点（ｍ、ｎ）での輝度をＬm、nと表記することにする。 The configuration of the second point will be described in detail. As shown in FIG. 2, the road section between two adjacent road lighting devices 1 is divided into 10 equal intervals with a width h along the traveling direction, and is equally spaced with a width i along the width direction. Consider the luminance at each dividing point when the number is divided into ten. At this time, a location where the middle of the two road lighting devices 1 crosses the width direction of the road 2 is defined as the crossing line C described above. In addition, m = −1, m = −2,..., M in order with respect to the transverse line C with respect to each transverse line located in the direction opposite to the traveling direction (arrow X) as viewed from the transverse line C. = -5 and numbers are assigned to each transverse line located in the traveling direction (arrow Y) when viewed from the transverse line C, in order, m = 1, m = 2,..., M = 5. I will attach it. In addition, the dividing lines that divide the width direction of the road 2 are numbered n = 1, n = 2,..., N = 10 in order from the side where the road lighting device 1 is arranged. To. The coordinates of each dividing point are expressed as (m, n), and the luminance at the dividing point (m, n) is expressed as L m, n .

先ず、２つの隣り合う道路照明装置１の間の道路区間の中点である横断線Ｃ上において、上記の平均輝度ＬAVE、総合均斉度Ｕ0を達成するように輝度を決定することとしている。すなわち、横断線Ｃ上における各分割点（０、ｎ）での輝度Ｌ0、nを、次式（１）、式（２）に従った輝度分布となるように、道路照明装置１の配光を制御する。 First, the luminance is determined so as to achieve the above average luminance L AVE and overall uniformity U 0 on the transverse line C, which is the midpoint of the road section between two adjacent road lighting devices 1. . That is, the distribution of the road lighting device 1 is set so that the luminance L 0, n at each dividing point (0, n) on the transverse line C becomes a luminance distribution according to the following equations (1) and (2). Control the light.

Ｌ0、n＝ａ（ｎ×ｉ−０．５Ｂ）＋Ｌave （１）
ａ＝（Ｕ0−１）Ｌave／０．４５Ｂ （２） L 0, n = a (n × i−0.5B) + L ave (1)
a = (U 0 −1) L ave /0.45B (2)

式（１）について説明すると、一般に、横断線Ｃ上においては、道路照明装置１が配置された側である起点Ｃ0（ｎ＝０）から終点Ｃe（ｎ＝１０）に向かうにつれて減少する。そこで、本実施の形態では、図３に示すように、横断線Ｃにおいて、幅員方向の中点Ｃc（ｎ＝５）の点での輝度Ｌ0、5を、上記達成すべき平均輝度Ｌaveと同じ値とするように式（１）の一次式を決定し、これにより、当該横断線Ｃにおける全体の平均輝度が上記平均輝度Ｌaveとなるようにする。 The expression (1) will be described. Generally, on the crossing line C, the distance decreases from the starting point C 0 (n = 0) on the side where the road illumination device 1 is arranged toward the ending point C e (n = 10). . Therefore, in the present embodiment, as shown in FIG. 3, the brightness L 0 and 5 at the center point C c (n = 5) in the width direction on the transverse line C is set to the average brightness L to be achieved. The linear expression of the expression (1) is determined so as to have the same value as ave, and thereby the overall average brightness in the transverse line C becomes the average brightness L ave .

また、式（２）について説明すると、一般に、総合均斉度は、（そのエリアにおける平均輝度）／（そのエリアにおける最小輝度）にて求められる。すなわち、横断線Ｃ上の総合均斉度を上記総合均斉度Ｕ0とするには、横断線Ｃ上における最小輝度を総合均斉度Ｕ0×平均輝度Ｌaveとすればよい。上記のように、横断線Ｃ上において輝度が最小となるのは、横断線Ｃの終点Ｃe（ｎ＝１０）であるが、あるエリアの総合均斉度を算出する際には、そのエリアの縁部を含めずに算出するのが一般的である。そこで、本実施の形態では、横断線Ｃ上において、ｎ＝１〜９の範囲で総合均斉度Ｕ0を達成することとし、当該ｎ＝１〜９において輝度が最小となるｎ＝９．５の点で、その輝度Ｌ0、9.5をＵ0×平均輝度Ｌaveとする。以上のことから、横断線Ｃ上において、ｎ＝５（０．５Ｂ）の点での輝度Ｌ0、5が平均輝度Ｌave、ｎ＝９．５（０．９５Ｂ）の点での輝度Ｌ0、9.5がＵ0×平均輝度Ｌaveとなるように、当該横断線Ｃ上における輝度分布を一次式で示すと、その傾きａは（Ｕ0−１）Ｌave／０．４５Ｂとなる。 Further, the expression (2) will be described. Generally, the total uniformity is obtained by (average luminance in the area) / (minimum luminance in the area). That is, in order to set the overall uniformity on the transverse line C to the above-described overall uniformity U 0 , the minimum luminance on the transverse line C may be set to the overall uniformity U 0 × average luminance L ave . As described above, the luminance becomes the minimum in the transverse line C, and an endpoint C e of the transverse line C (n = 10), when calculating the overall uniformity of a certain area, in the area It is common to calculate without including the edge. Therefore, in the present embodiment, the overall uniformity U 0 is achieved in the range of n = 1 to 9 on the transverse line C, and n = 9.5 where the luminance is minimum at n = 1 to 9. At this point, the luminances L 0 and 9.5 are U 0 × average luminance L ave . From the above, on the transverse line C, the luminance L 0,5 at the point of n = 5 (0.5B) is the average luminance L ave , and the luminance L at the point of n = 9.5 (0.95B). When the luminance distribution on the transverse line C is expressed by a linear expression so that 0 and 9.5 are U 0 × average luminance L ave , the slope a is (U 0 −1) L ave /0.45B.

このように、横断線Ｃ上の輝度分布Ｌ0nが式（１）、式（２）に従うように配光を制御すれば、当該横断Ｃ上における平均輝度及び総合均斉度を上記の平均輝度Ｌave、及び、総合均斉度Ｕ0とすることが可能となる。 In this way, if the light distribution is controlled so that the luminance distribution L 0n on the transverse line C follows the equations (1) and (2), the average luminance and the total uniformity on the transverse C are set to the average luminance L described above. It is possible to set ave and total uniformity U 0 .

また、上記のように横断線Ｃ上の輝度分布を決定した後、当該横断線Ｃを基準にして自動車の走行方向と対向する方向（図中矢印Ｘで示す）に沿って路面輝度をなだらかに減少させ、自動車の走行方向に沿った方向（図中矢印Ｙで示す）では輝度をなだらかに増加させるようにすることで、上記車線軸均斉度Ｕlを達成することができる。 In addition, after determining the luminance distribution on the crossing line C as described above, the road surface luminance is gently reduced along the direction (indicated by an arrow X in the figure) opposite to the traveling direction of the vehicle with respect to the crossing line C. The lane axis uniformity U l can be achieved by decreasing the luminance and increasing the luminance gently in the direction along the traveling direction of the vehicle (indicated by an arrow Y in the figure).

より詳細には、横断線Ｃ上における点ｎの輝度Ｌ0、nに対して、自動車の走行方向と対向する方向（図中矢印Ｘで示す）に沿った各分割点（ｍ、ｎ）の輝度Ｌm、nを、
Ｌm-1、n＝ＫL×Ｌm、n（ｍ＝０、−１、・・・、−５）
ＫLは０＜ＫL＜１を満たす定数（例えば、ＫL＝０．８〜０．９）
とすると共に、横断線Ｃ上における点ｎの輝度Ｌ0、nに対して、自動車の走行方向（図中矢印Ｙで示す）に沿った各分割点（ｍ、ｎ）の輝度Ｌm、nを、
Ｌm+1、n＝ＫR×Ｌm、n（但し、ｍ＝０、１、・・・、５）
ＫRは１＜ＫRを満たす定数（例えば、ＫR＝１．２〜１．３）
としている。これにより、道路２の車線軸に沿った輝度は、横断線Ｃを中心として道路２の左側から右側にかけてなだらかに増加するようになり、上記の総合均斉度Ｕlが達成される。 More specifically, with respect to the brightness L 0, n of the point n on the transverse line C, each division point (m, n) along the direction (indicated by the arrow X in the figure) opposite to the traveling direction of the automobile is shown. Luminance L m, n
L m-1, n = K L × L m, n (m = 0, -1,... -5)
K L is a constant satisfying 0 <K L <1 (for example, K L = 0.8 to 0.9)
And the brightness L m , n of each dividing point (m, n) along the traveling direction of the vehicle (indicated by arrow Y in the figure) with respect to the brightness L 0, n of the point n on the transverse line C The
L m + 1, n = K R × L m, n (where m = 0, 1,..., 5)
K R is a constant satisfying 1 <K R (for example, K R = 1.2 to 1.3)
It is said. As a result, the luminance along the lane axis of the road 2 gradually increases from the left side to the right side of the road 2 with the transverse line C as the center, and the above-described total uniformity U 1 is achieved.

以上のようにして、隣り合う２つの道路照明装置１の間の道路区間における輝度分布を決定し、例えば図４に示すような輝度分布を道路２に形成するように道路照明装置１の配光を制御することで、当該道路照明装置１を広スパンＳで配置しつつ、上記の平均輝度ＬAVE、総合均斉度Ｕ0、車軸線均斉度Ｕlといった指標値を達成し、さらに、グレアの抑制を図ることが可能となる。 As described above, the luminance distribution in the road section between the two adjacent road lighting devices 1 is determined, and for example, the light distribution of the road lighting device 1 so as to form the luminance distribution as shown in FIG. By controlling the above, the road illumination device 1 is arranged with a wide span S, and the index values such as the average luminance L AVE , the overall uniformity U 0 , and the axle line uniformity U 1 are achieved. It becomes possible to suppress it.

次いで、道路照明装置１の灯具３の構成について図５乃至図９を参照して説明する。これらの図に示すように、灯具３は、図示しない灯具本体内部に配置される反射鏡３０と、この反射鏡３０内部に配置される光源としてのランプ４０とを備えている。反射板３０は、下面（灯具設置時に地面と対向する面）が開口し、全体として走行方向おいて左右対称形状に構成されている。   Next, the configuration of the lamp 3 of the road lighting device 1 will be described with reference to FIGS. As shown in these drawings, the lamp 3 includes a reflecting mirror 30 disposed inside a lamp main body (not shown) and a lamp 40 as a light source disposed inside the reflecting mirror 30. The reflection plate 30 has a lower surface (a surface that faces the ground when the lamp is installed) opened, and is configured in a bilaterally symmetric shape in the traveling direction as a whole.

反射板３０についてより詳細に説明すると、反射板３０は、ランプ４０の光に対して所定の反射率を有する金属板（例えばアルミニウム板）から形成され、ランプ４０を覆うカップ形状に形成され、内部に配置されたランプ４０の光を道路２に向けて反射する。詳細には、反射板３０は、ランプ４０の後方、つまり、ランプ４０が接続されるソケット側に形成された反射面３１Ａと、ランプ４０の周方向に沿って形成された反射面３１Ｂと、ランプ４０の縦軸先端方向、すなわち、反射面３１Ａとの対向面に形成された反射面３１Ｃとが一体的に連接して形成され、上記反射面３１Ａ及び３１Ｃによって道路２の幅員方向に向けて反射光が照射され、反射面３１Ｂによって道路２の走向方向に向けて照射光が照射される。   The reflecting plate 30 will be described in more detail. The reflecting plate 30 is formed of a metal plate (for example, an aluminum plate) having a predetermined reflectance with respect to the light of the lamp 40, is formed in a cup shape that covers the lamp 40, and has an internal structure. The light of the lamp 40 arranged at the position is reflected toward the road 2. Specifically, the reflecting plate 30 includes a reflecting surface 31A formed on the rear side of the lamp 40, that is, on the socket side to which the lamp 40 is connected, a reflecting surface 31B formed along the circumferential direction of the lamp 40, the lamp 40 in the direction of the front end of the vertical axis, that is, the reflecting surface 31C formed on the surface facing the reflecting surface 31A is integrally connected, and is reflected toward the width direction of the road 2 by the reflecting surfaces 31A and 31C. Light is irradiated, and irradiation light is irradiated toward the running direction of the road 2 by the reflecting surface 31B.

ランプ４０は略円筒状の発光管４１を有し、ランプ４０の縦軸４２が反射板３０の左右対称軸と重なるように配置される。これにより、灯具３の照明光は、道路２の走行方向に灯具３を中心に左右対称に照射される。本実施の形態では、ランプ４０に従来と略同程度のワット数のランプである例えば１８０ワット（１９００ルーメン）のナトリウムランプが用いることとしている。このように、灯具３のランプのワット数を従来のものから変更しない場合には、道路照明装置１のスパンＳを広くするに際して、上記の平均輝度Ｌaveを達成するための十分な輝度が得られないという懸念があるが、本実施の形態においては、次のようにして、十分な輝度が得られるようにしている。すなわち、本実施の形態では、図９に示すように、反射板３０内部におけるランプ４０の配置位置を、従来の配置位置３２Ａから光中心が深くなるようにランプ４０を反射板３０の底部に向けて所定距離ｄだけ移動させた配置位置３２Ｂに変更している。これにより、より多くの光束が反射板３０にて反射され、照明効率が高められるため、道路照明装置１を広スパンで配置する場合であっても、ランプ４０のワット数を上げることなく、十分な輝度を確保することができる。 The lamp 40 has a substantially cylindrical arc tube 41, and is arranged so that the vertical axis 42 of the lamp 40 overlaps the left-right symmetric axis of the reflector 30. Thereby, the illumination light of the lamp 3 is irradiated symmetrically about the lamp 3 in the traveling direction of the road 2. In the present embodiment, for example, a 180 watt (1900 lumen) sodium lamp, which is a lamp having a wattage substantially the same as that of the conventional lamp, is used as the lamp 40. Thus, when the wattage of the lamp of the lamp 3 is not changed from the conventional one, when the span S of the road lighting device 1 is widened, sufficient brightness to achieve the above average brightness Lave is obtained. However, in this embodiment, sufficient luminance is obtained as follows. That is, in the present embodiment, as shown in FIG. 9, the lamp 40 is arranged in the reflector 30 so that the lamp 40 is directed toward the bottom of the reflector 30 so that the optical center is deeper than the conventional arrangement position 32A. Thus, the arrangement position 32B is changed by a predetermined distance d. As a result, more luminous flux is reflected by the reflector 30 and the illumination efficiency is improved. Therefore, even when the road illumination device 1 is arranged with a wide span, the wattage of the lamp 40 is not increased. High brightness can be secured.

さて、道路２の走向方向には反射面３１Ｂで反射された反射光が照射されるのは上述した通りである。具体的には、図６乃至図８に示すように、反射面３１Ｂの内面は、階段状に複数の反射部３１Ｂ１・・・３１Ｂｎを連接した形状に形成され、それぞれの反射部３１Ｂ１・・・３１Ｂｎにてランプ４０からの光が反射されて道路２の走向方向に向けて照射される。このとき、底部３３Ｂ側に位置する反射部３１Ｂ１よりも開口端３３Ａ側に位置する反射部３１Ｂｎの方が走向方向遠方にまで光を反射する。すなわち、開口端３３Ａに位置する反射部３１Ｂｎによって最大光度角鉛直角θが規定されることになる。   As described above, the traveling direction of the road 2 is irradiated with the reflected light reflected by the reflecting surface 31B. Specifically, as shown in FIGS. 6 to 8, the inner surface of the reflecting surface 31B is formed in a shape in which a plurality of reflecting portions 31B1... 31Bn are connected in a stepped manner, and each reflecting portion 31B1. At 31 Bn, the light from the lamp 40 is reflected and irradiated toward the direction of travel of the road 2. At this time, the reflecting portion 31Bn located on the opening end 33A side reflects light farther in the running direction than the reflecting portion 31B1 located on the bottom portion 33B side. That is, the maximum luminous intensity angle vertical angle θ is defined by the reflecting portion 31Bn located at the opening end 33A.

一般には、図１０に示すように、反射面３１Ｂは、底部３３Ｂから開口端３３Ａにかけて次第に広げる形状に形成されるものの、この形状にあっては、最大光度角鉛直角θがおおよそ６０°程度となり、本実施の形態における７０°〜７５°の最大光度角鉛直角θを達成することができない。   In general, as shown in FIG. 10, the reflecting surface 31B is formed in a shape that gradually widens from the bottom 33B to the opening end 33A, but in this shape, the maximum luminous intensity angle vertical angle θ is about 60 °. In this embodiment, the maximum luminous intensity angle vertical angle θ of 70 ° to 75 ° cannot be achieved.

そこで、本実施の形態においては、例えば図８に示すように、反射面３１Ｂの開口端３３Ａに位置する反射部３１Ｂｎを内側に向けて屈曲させ反射板３０の開口端３３Ａを縮径させた形状、いわゆる、アンダーカット形状として、ランプ４０から開口端３３Ａへの光の入り角を広げることで、最大光度角鉛直角θをおおよそ７０°〜７５°にまで拡大している。これにより、反射光を道路２の走向方向に向かって遠方まで到達させることができ、道路照明装置１を従来よりも広スパンＳで配置することが可能となる。   Therefore, in the present embodiment, for example, as shown in FIG. 8, a shape in which the reflecting portion 31Bn located at the opening end 33A of the reflecting surface 31B is bent inward and the opening end 33A of the reflecting plate 30 is reduced in diameter. As a so-called undercut shape, the maximum light intensity angle vertical angle θ is expanded to approximately 70 ° to 75 ° by widening the incident angle of light from the lamp 40 to the opening end 33A. Thereby, reflected light can be made to reach | attain far from the running direction of the road 2, and it becomes possible to arrange | position the road illuminating device 1 by the wider span S than before.

また本実施の形態では、反射板３０の反射面３１Ｂの各反射部３１Ｂ、・・・、３１Ｂｎの反射面積を調整して、道路２の各分割点（ｍ、ｎ）（図２参照）へ照射する光量を調整することで、上記横断線Ｃ上での平均輝度及び総合均斉度を、上述した平均輝度Ｌave、及び、総合均斉度Ｕ0とすると共に、横断線Ｃを基準にして自動車の走行方向と対向する方向に沿って路面輝度をなだらかに減少させ、走行方向に沿って路面輝度をなだらかに増加させるような配光特性を形成している。 Moreover, in this Embodiment, the reflective area of each reflection part 31B, ..., 31Bn of the reflective surface 31B of the reflecting plate 30 is adjusted, and each division | segmentation point (m, n) (refer FIG. 2) of the road 2 is adjusted. By adjusting the amount of light to be irradiated, the average luminance and the overall uniformity on the transverse line C are set to the above-described average luminance L ave and the overall uniformity U 0, and the automobile is based on the transverse line C. The light distribution characteristic is formed such that the road surface luminance is gently decreased along the direction opposite to the traveling direction of the vehicle and the road surface luminance is gently increased along the traveling direction.

このような反射板３０の製造工程について説明すると、先ず、反射板３０の基材となる平板に対して深絞り加工を施すことによりカップ形状を形成し、反射面３１Ａ〜３１Ｃを成形する。このとき、各反射部３１Ｂ１・・・３１Ｂｎの繋ぎ目部分で破断等が発生するのを防止すべく、最初に比較的浅いカップ形状から次第に深いカップ形状を形成するように、複数の型を順次用いて段階的に成形する。この深絞り加工においては、型がカップ部分から抜けるように、カップ部分の形状を例えば図９に示す如く開口端３３Ａを縮径させずに、底部３３Ｂから開口端３３Ａに向かい順次径が広がる形状に成形する。   The manufacturing process of such a reflecting plate 30 will be described. First, a cup shape is formed by performing deep drawing on a flat plate serving as a base material of the reflecting plate 30, and the reflecting surfaces 31A to 31C are formed. At this time, in order to prevent breakage or the like from occurring at the joint portions of the reflecting portions 31B1... 31Bn, the plurality of molds are sequentially formed so as to form a relatively deep cup shape from a relatively shallow cup shape first. Use to form in steps. In this deep drawing, the shape of the cup portion is such that the diameter gradually increases from the bottom 33B to the opening end 33A without reducing the diameter of the opening end 33A as shown in FIG. To form.

次いで、反射面３１Ｂの開口端３３Ａをアンダーカット形状とすべく、カップ部分の内側に分解可能に構成された縮径用中枠を配置すると共に、カップ部分の外側から開口端３３Ａを押圧して、当該開口端３３Ａを縮径する。当該開口端３３Ａを縮径した後は、縮径用中枠を分解してカップ部分から取り出す。以上の工程により反射面Ｂの開口端３３Ａがアンダーカット形状に成形された反射板３０が一体成形される。   Next, in order to make the opening end 33A of the reflecting surface 31B into an undercut shape, an inner frame for reducing diameter configured to be disassembled is disposed inside the cup portion, and the opening end 33A is pressed from the outside of the cup portion. The diameter of the opening end 33A is reduced. After the diameter of the opening end 33A is reduced, the reduced diameter inner frame is disassembled and taken out from the cup portion. Through the above steps, the reflecting plate 30 in which the open end 33A of the reflecting surface B is formed in an undercut shape is integrally formed.

このように、反射板３０のアンダーカット部分を一体成形することで、例えばアンダーカット用の反射部材を別途反射板３０に取り付けた場合に比べ、精度良く反射光の反射角などを制御することが可能となる。   Thus, by integrally molding the undercut portion of the reflecting plate 30, for example, the reflection angle of the reflected light can be controlled with higher accuracy than when a reflecting member for undercut is separately attached to the reflecting plate 30, for example. It becomes possible.

以上説明したように、本実施の形態によれば、灯具３を約７０°〜７５°の最大光度角鉛直角を有するように構成し、また、隣り合う道路照明装置同士１の略中間点を前記道路の幅員方向に横断する横断線Ｃ上での平均輝度及び総合均斉度を、達成すべき平均輝度Ｌave、及び、総合均斉度Ｕ0と同程度の値すると共に、横断線Ｃを基準にして自動車の走行方向と対向する方向に沿って路面輝度をなだらかに減少させ、走行方向に沿って路面輝度をなだらかに増加させるように灯具３を構成したため、道路照明装置１を広スパンＳで配置しつつ、上記の平均輝度ＬAVE、総合均斉度Ｕ0、車軸線均斉度Ｕlといった指標値を達成し、さらに、グレアの抑制を図ることが可能となる。これにより、十分な視認性を維持しつつ、道路２に配置すべき灯数を減らすことが可能となる。 As described above, according to the present embodiment, the lamp 3 is configured to have a maximum luminous intensity vertical angle of about 70 ° to 75 °, and a substantially middle point between adjacent road lighting devices 1 is set. The average brightness and the overall uniformity on the crossing line C crossing in the width direction of the road are equal to the average brightness L ave to be achieved and the overall uniformity U 0, and the crossing line C is used as a reference. The road lighting device 1 is arranged with a wide span S because the lamp 3 is configured to gently decrease the road surface brightness along the direction opposite to the traveling direction of the car and increase the road surface brightness along the traveling direction. However, it is possible to achieve index values such as the above average luminance L AVE , total uniformity U 0 , and axle line uniformity U 1 , and to further suppress glare. As a result, it is possible to reduce the number of lamps to be arranged on the road 2 while maintaining sufficient visibility.

また、本実施の形態によれば、ポール４の高さＨと、道路照明装置１の配置間隔Ｓとの比がＳ／Ｈ＝４．５〜５になるように道路照明装置１の各々を道路２に沿って配置したため、例えば、ポール４の高さＨを従来のものと同程度の高さとすれば、従来よりも広いスパンＳで道路照明装置１を配置することができる。   Further, according to the present embodiment, each of the road lighting devices 1 is adjusted so that the ratio of the height H of the pole 4 and the arrangement interval S of the road lighting devices 1 is S / H = 4.5-5. Since it is arranged along the road 2, for example, if the height H of the pole 4 is set to the same level as the conventional one, the road lighting device 1 can be arranged with a span S wider than the conventional one.

ここで、従来の灯具を用いた場合であっても、ポールの高さＨを高くして照射範囲を広げれば、路全体を照射しつつ灯具の数を減らすことができるものの、このような構成とすると、ポールが高くなる分、当該ポールのコストが増大すると共に、道路照明装置の設置に要する施工コストやメンテナンス費用も高くなってしまう。これに対して、本実施の形態によれば、ポール４の高さＨを高くせずとも、道路２の走向方向に照射可能範囲を広げ、灯数を削減することができる。また、単純にポールの高さＨを高くする構成であると、道路２の幅員方向にも照射範囲が広がってしまい、道路周辺の環境に悪影響を及ぼす恐れがある（いわゆる光害）。これに対して、本実施の形態によれば、主として、道路２の走向方向に向かって照射可能範囲を広げる構成としているため、道路周辺の環境に悪影響を及ぼすことがない。   Here, even when a conventional lamp is used, the number of lamps can be reduced while irradiating the entire road if the height H of the pole is increased to widen the irradiation range. Then, as the pole becomes higher, the cost of the pole increases, and the construction cost and maintenance cost required for installing the road lighting device also increase. On the other hand, according to the present embodiment, it is possible to expand the irradiable range in the running direction of the road 2 and reduce the number of lights without increasing the height H of the pole 4. Moreover, if the configuration is such that the height H of the pole is simply increased, the irradiation range also extends in the width direction of the road 2 and there is a risk of adversely affecting the environment around the road (so-called light pollution). On the other hand, according to the present embodiment, since the irradiable range is mainly expanded toward the direction of travel of the road 2, the environment around the road is not adversely affected.

また本実施の形態によれば、ランプ４０を、光中心が深くなるように反射板３０の内部に配置したため、より多くの光束が反射板３０にて反射されることで照明効率が高められるため、道路照明装置１を広スパンで配置する場合であっても、ランプ４０のワット数を上げることなく、十分な輝度を確保することができる。これにより、ランプ４０のコストを抑えることができる。   In addition, according to the present embodiment, since the lamp 40 is disposed inside the reflector 30 so that the optical center is deeper, more luminous flux is reflected by the reflector 30, so that the illumination efficiency is improved. Even when the road lighting device 1 is arranged with a wide span, sufficient luminance can be ensured without increasing the wattage of the lamp 40. Thereby, the cost of the lamp 40 can be suppressed.

特に、ランプ４０を、光中心が深くなるように反射板３０の内部に配置すると共に、灯具３を約７０°〜７５°の最大光度角鉛直角を有するように構成することで、照明効率の向上によって得られた分の光束を、道路２の走向方向遠方に振り分けて、道路２の遠方を効果的に照射することができる。   In particular, the lamp 40 is arranged inside the reflector 30 so that the center of the light is deep, and the lamp 3 is configured to have a maximum luminous intensity vertical angle of about 70 ° to 75 °. The light flux obtained by the improvement can be distributed to the far side of the road 2 in the direction of travel, and the far side of the road 2 can be effectively irradiated.

また、本実施の形態によれば、平板に対して深絞り加工にカップ形状を形成した後に、開口端３３Ａを内側に向けて縮径して当該開口端３３Ａにアンダーカット形状を一体成形して反射板３０を成形したため、例えばアンダーカット用の反射部材を別途反射板３０に取り付けた場合に比べ、精度良く反射光の反射角などを制御することが可能となる。   In addition, according to the present embodiment, after forming a cup shape for deep drawing on a flat plate, the diameter of the opening end 33A is reduced toward the inside, and the undercut shape is integrally formed with the opening end 33A. Since the reflecting plate 30 is formed, for example, the reflection angle of the reflected light can be controlled with higher precision than when a reflecting member for undercut is separately attached to the reflecting plate 30.

なお、上述した実施の形態は、あくまでも本発明の一態様を示すものであり、本発明の範囲内で任意に変形可能であることは勿論である。   It should be noted that the above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified within the scope of the present invention.

本発明の実施の形態に係る道路照明システムの構成を示す図である。It is a figure which shows the structure of the road lighting system which concerns on embodiment of this invention. 道路上の輝度分布を説明するための図である。It is a figure for demonstrating the luminance distribution on a road. 隣り合う道路照明装置同士の中点における輝度分布を説明するための図である。It is a figure for demonstrating the luminance distribution in the midpoint of adjacent road lighting apparatuses. 道路上の輝度分布の一態様を示す図である。It is a figure which shows the one aspect | mode of the luminance distribution on a road. 灯具の構成を示す平面図である。It is a top view which shows the structure of a lamp. 灯具の構成を示す側面図である。It is a side view which shows the structure of a lamp. 灯具の構成を示す斜視図である。It is a perspective view which shows the structure of a lamp. 灯具の構成を示す断面図である。It is sectional drawing which shows the structure of a lamp. ランプの配置を説明するための図である。It is a figure for demonstrating arrangement | positioning of a lamp | ramp. 従来の反射板の形状を示す断面図である。It is sectional drawing which shows the shape of the conventional reflecting plate.

符号の説明Explanation of symbols

１ 道路照明装置
２ 道路
３ 灯具
３０ 反射板
３１Ａ〜３１Ｃ 反射面
３３Ａ 開口端
４０ ランプ
Ｂ 道路幅
Ｃ 横断線
θ 最大光度角鉛直角
DESCRIPTION OF SYMBOLS 1 Road illuminating device 2 Road 3 Lamp 30 Reflector 31A-31C Reflective surface 33A Open end 40 Lamp B Road width C Transverse line θ Maximum luminous intensity angle Vertical angle

Claims (7)

ポールの頂部に灯具を取り付けられた道路照明装置が道路の路肩に、当該道路に沿って所定の間隔で配置され、当該道路を連続照明する道路照明システムにおいて、
前記灯具を約７０°〜７５°の最大光度角鉛直角を有するように構成すると共に、
隣り合う道路照明装置同士の略中間点を前記道路の幅員方向に横断する横断線の中点での輝度を達成すべき平均輝度とし、該横断線上での輝度を前記道路照明装置が配置された側を基準に幅員方向に沿って減少させると共に、前記横断線を基準にして自動車の走行方向と対向する方向に沿って路面輝度を減少させ、前記走行方向に沿って路面輝度を増加させるように前記灯具を構成したことを特徴とする道路照明システム。 In a road lighting system in which a road lighting device having a lamp attached to the top of a pole is arranged on the shoulder of the road at a predetermined interval along the road, and continuously illuminates the road,
Configuring the lamp to have a maximum luminous intensity vertical angle of about 70 ° to 75 °;
The luminance at the midpoint of the transverse line that crosses the substantially middle point between adjacent road lighting devices in the width direction of the road is set to the average luminance, and the luminance on the crossing line is arranged on the road lighting device. The road surface brightness is decreased along the width direction with respect to the side, and the road surface brightness is decreased along the direction opposite to the traveling direction of the automobile with respect to the transverse line, and the road surface brightness is increased along the traveling direction. A road lighting system comprising the lamp. 前記ポールの高さＨと、前記道路照明装置の配置間隔Ｓとの比がＳ／Ｈ＝４．５〜５になるように前記道路照明装置の各々を前記道路に沿って配置したことを特徴とする請求項１に記載の道路照明システム。   Each of the road lighting devices is arranged along the road so that a ratio between a height H of the pole and an arrangement interval S of the road lighting devices is S / H = 4.5-5. The road lighting system according to claim 1. 前記横断線上の総合均斉度を０．４以上とし、前記道路の車線軸均斉度を０．７以上としたことを特徴とする請求項１または２に記載の道路照明システム。 3. The road lighting system according to claim 1, wherein the overall uniformity on the crossing line is 0.4 or more, and the lane axis uniformity of the road is 0.7 or more. 前記灯具は、光源と、前記光源が内部に配置されるカップ形状の反射板とを備え、
前記光源を、光中心が深くなるように前記反射板の内部に配置したことを特徴とする請求項１乃至３のいずれかに記載の道路照明システム。 The lamp includes a light source and a cup-shaped reflector in which the light source is disposed,
The road lighting system according to any one of claims 1 to 3, wherein the light source is arranged inside the reflector so that the center of light is deep. 前記反射板の開口端に内側に向かって縮径するアンダーカット形状を設けたことを特徴とする請求項４に記載の道路照明システム。   The road lighting system according to claim 4, wherein an undercut shape that decreases in diameter toward the inside is provided at an opening end of the reflecting plate. ポールの頂部に灯具を取り付けられた道路照明装置を、道路の路肩に当該道路に沿って所定の間隔で配置して、当該道路を連続照明する道路照明方法において、
前記灯具の最大光度角鉛直角を約７０°〜７５°とすると共に、
前記灯具の配光を、隣り合う道路照明装置同士の略中間点を前記道路の幅員方向に横断する横断線の中点での輝度を達成すべき平均輝度とし、該横断線上での輝度を前記道路照明装置が配置された側を基準に幅員方向に沿って減少させると共に、前記横断線を基準にして自動車の走行方向と対向する方向に沿って路面輝度をなだらかに減少させ、前記走行方向に沿って路面輝度をなだらかに増加させるようにした
ことを特徴とする道路照明方法。 In the road lighting method for continuously illuminating the road by arranging a road lighting device with a lamp attached to the top of the pole at predetermined intervals along the road on the shoulder of the road,
The maximum luminous intensity vertical angle of the lamp is about 70 ° to 75 °,
The light distribution of the lamp is an average luminance that should achieve the luminance at the midpoint of the transverse line that crosses the substantially middle point between adjacent road lighting devices in the width direction of the road, and the luminance on the transverse line is Decrease along the width direction with respect to the side on which the road lighting device is arranged, and gently reduce the road surface brightness along the direction opposite to the driving direction of the car with respect to the crossing line. A road lighting method characterized by gradually increasing the road surface brightness along the road. 光源と反射板とを有する灯具がポールの頂部に取り付けられて構成され、道路の路肩に当該道路に沿って所定の間隔で配置されて当該道路を照明する道路照明装置において、
平板に対して深絞り加工にカップ形状を形成した後に、開口端を内側に向けて縮径して当該開口端にアンダーカット形状を一体成形して前記反射板を成形し、前記開口端における最大光度角鉛直角を約７０°〜７５°とすると共に、
前記反射板は、隣り合う道路照明装置同士の略中間点を前記道路の幅員方向に横断する横断線の中点での輝度を達成すべき平均輝度とし、該横断線上での輝度を前記道路照明装置が配置された側を基準に幅員方向に沿って減少させると共に、前記横断線を基準にして自動車の走行方向と対向する方向に沿って路面輝度をなだらかに減少させ、前記走行方向に沿って路面輝度をなだらかに増加させる配光特性を有する
ことを特徴とする道路照明装置。 In a road illuminating device configured to attach a lamp having a light source and a reflector to the top of a pole and illuminate the road by being arranged at predetermined intervals along the road on the shoulder of the road,
After forming a cup shape for deep drawing on a flat plate, the diameter of the opening end is reduced toward the inside, an undercut shape is formed integrally with the opening end, and the reflector is formed. The luminous intensity vertical angle is about 70 ° to 75 °,
The reflector has an average luminance that should achieve a luminance at a midpoint of a transverse line that crosses a substantially middle point between adjacent road illumination devices in the width direction of the road, and the luminance on the transverse line is the road illumination. Decrease along the width direction with respect to the side where the device is arranged, and gently reduce the road surface brightness along the direction opposite to the driving direction of the car with respect to the transverse line, along the driving direction. A road lighting device characterized by having a light distribution characteristic that gently increases road surface brightness.
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