JP2004278274A - Sign board for road surface - Google Patents

Sign board for road surface Download PDF

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Publication number
JP2004278274A
JP2004278274A JP2003117650A JP2003117650A JP2004278274A JP 2004278274 A JP2004278274 A JP 2004278274A JP 2003117650 A JP2003117650 A JP 2003117650A JP 2003117650 A JP2003117650 A JP 2003117650A JP 2004278274 A JP2004278274 A JP 2004278274A
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JP
Japan
Prior art keywords
road
film layer
light
glass film
signboard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2003117650A
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Japanese (ja)
Inventor
Kazuo Saito
一夫 斉藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YAMASHO KK
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YAMASHO KK
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Filing date
Publication date
Application filed by YAMASHO KK filed Critical YAMASHO KK
Priority to JP2003117650A priority Critical patent/JP2004278274A/en
Publication of JP2004278274A publication Critical patent/JP2004278274A/en
Pending legal-status Critical Current

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  • Road Signs Or Road Markings (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sign board for a road surface which prevents the abrasion of a surface and the separation of a pattern, which reduces the adhesion of dust etc. to the surface, and which can spontaneously emit light at high luminance in dark for a long period of time without the need for an alternator for lighting. <P>SOLUTION: This sign board (1) which is buried in or laid on the road surface of a road, a side strip, etc., is characterized in that: liner paper (3) and aluminum foil(4) are bonded to each other with an adhesive (5); and a glass film layer (10) which is formed of a single-component or a multicomponent metal-oxide glass film is provided on the surface of a base material (2) wherein glass bulbs (7) are provided on the surface of the aluminum foil (4) with a binder (6) between. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、道路や路側帯等の路面に埋設または敷設される標示板であって、特に、表面の摩耗や汚れの付着を防ぐと共に、暗闇で長時間高輝度に自然発光することができる路面用標示板に関する。
【0002】
【従来の技術】
従来より、路面に設置される標示板においては、車両や歩行者のための道路標示板や、禁煙地域や駐輪区域等の規制を記載した標示板がある。また特に、暗闇で発光することにより、夜間における交通安全上に果たす役割を大きくさせた路面埋込用発光道路標識がある(例えば、特許文献1参照)。
【0003】
【特許文献1】
特開平11−166213号公報 (第1−3頁、図1)
【0004】
【発明が解決しようとする課題】
上記特許文献1の路面埋込用発光道路標識は、透明ポリカーボネート樹脂製基板の表面に多数の凹凸が形成されていると共に、裏面全面に凹部が形成されており、該凹部内にエレクトロルミネッセンスパネル、シリコン樹脂及び裏蓋が順次嵌め込まれていることにより形成されている。しかし、前記の道路標識においては、エレクトロルミネッセンスパネルを発光させるために点灯用の交流電源や太陽電池等の電源が必要となるため、稼働コストが必要で製造コストも割高になるという問題があった。
【0005】
そこで本発明は上記の点に鑑み、表面の摩耗や図柄の剥離を防ぎ、塵埃等が表面に付着するのを軽減すると共に、点灯用の交流電源を必要とせず、暗闇で長時間高輝度に自然発光することができる路面用標示板を提供することにある。
【0006】
【課題を解決するための手段】
上記課題を解決するために、本発明は、道路や路側帯等の路面に埋設または敷設される標示板であって、該標示板は、ライナー紙とアルミフォイルとを接着剤にて接着し、かかるアルミフォイルの表面にバインダーを介在させてガラス球を設けた基材の表面に、単一あるいは多成分系の金属酸化物ガラス膜により形成されるガラス膜層を設けたことを特徴とする。そのため、屋外に長期間設置しても、表面が摩耗したり図柄が剥離することがなく、さらに表面に塵埃が付着することを軽減して外観的劣化を防ぐことができる。
【0007】
また、金属酸化物ガラス膜により形成されるガラス膜層を、加水分解可能な有機金属化合物を、水と有機溶媒の反応液中で、ホウ素イオンの存在下、ハロゲンイオンを触媒にしpHを4.5ないし5.0に調整しつつ加水分解、脱水縮合して反応生成物を生成し、200度以下の温度でガラス化してなる膜層により形成する。
【0008】
また、前記基材とガラス膜層との間に、周囲の光を蓄え自然発光可能な蓄光剤による発光膜層を介在させたことにより、標示板が暗闇で高輝度に長時間自然発光するため、夜間において識別力や安全性を高めることができる。
【0009】
さらに、本発明の路面用標示板を自転車停止用の標示板やたばこ投げ捨て禁止用の標示板とすることにより、夜間に発生する自転車との接触事故やたばこ投げ捨てによる火災発生等を解消できる。
【0010】
【発明の実施の形態】
次に、本発明の路面用標示板の実施の形態を図面に基づいて説明する。なお、図1は本発明の路面用標示板の拡大断面図、図2は路面用標示板を路面内に埋設した状態、図3は路面用標示板を路面上に敷設した状態、図4は他の好適例を示す路面用標示板の拡大断面図、図5は一部を欠切した自転車停止用の標示板、図6は一部を欠切したたばこ投げ捨て禁止用の標示板をそれぞれ表す。
【0011】
図1に示す本発明の路面用標示板は、道路や路側帯等の路面に埋設または敷設されるもので、標示板1は、基材2の表面に、単一あるいは多成分系の金属酸化物ガラス膜により形成されるガラス膜層10を設けたことを特徴とする。
【0012】
前記基材2は、ライナー紙3と薄い柔軟性のアルミフォイル4とを接着剤5を介して接着し、かかるアルミフォイル4の表面にバインダー6を介在させ、高反射率のガラス球7を均一に設けた(塗布)ことにより形成される。
【0013】
ガラス膜層10は、前記基材2の表面をコーティングするように設けられる、単一あるいは多成分系の金属酸化物ガラス膜からなっている。そして、この金属酸化物ガラスからなるガラス膜層10の表面は、通常のガラス表面と同様に極めて滑らかである上に、鏡の表面のように光を反射するきらきらと輝く充分な光沢を有している。
【0014】
また、このガラス膜層10は光透過性にも優れており、ガラス膜層10内を通過する光が有する光力をなんら減光することがない。また、ガラス膜層10は耐候性も極めて優れており、長期間屋外で風雨に晒されてもガラス自体が変色あるいは白濁することがなく、さらに塵埃や煤煙等が内部へと浸透することがく、外観的に劣化することがない。
【0015】
また、前記ガラス膜層10を形成する金属酸化物ガラスは、酸化チタンや酸化ケイ素と同様に光触媒効果があることが確認されている。周知のように光触媒効果は、光を受光した際に汚れ物質や臭い物質を分解除去することができるため、標示板1の表面に光触媒効作用を施すことにより、汚れの発生が抑えられると共に、表面が摩耗したり図柄が剥離することがない。
【0016】
前記ガラス膜層10を形成するには、予め、加水分解可能な有機金属化合物を、水と有機溶媒の反応液中で、ホウ素イオンの存在下、ハロゲンイオンを触媒にしpHを4.5ないし5.0に調整しつつ加水分解、脱水縮合して反応生成物を生成しておく。そして、この反応生成物を前記基材2の表面に所定厚み分塗布し、200度以下の温度でガラス化させることによりガラス膜を形成する。なお、この金属酸化物ガラスの形成方法は、特開平6−199528号公報(特許第2538527号)に記載された公知の技術である。
【0017】
なお、前記ガラス膜層10は、適宜希釈して汎用のスプレーにて噴霧することにより、基材2の表面に容易に施すことができる。
【0018】
また、他の好適例として、図4に示すように、前記基材2とガラス膜層10との間に、周囲の光を蓄え自然発光可能な蓄光剤による発光膜層11を介在させた。
【0019】
発光膜層11は、光を蓄え自然発光が可能な蓄光剤からなっていて、この蓄光剤は、周知の金属化合物や希土類を複数混合し汎用の展色剤を混合して形成するものである。この発光膜層11の層幅は、日没後、周囲が暗くなても周囲の状況を確認するのに充分な光力を放つことが可能で、さらに夜が明けるまで光を放出し続ける充分な発光時間(約10時間)を確保するために必要な厚み、10cm四方に対し3ないし5gの蓄光剤を散布して形成される層幅を有している。
【0020】
前記発光膜層11を例えば図柄部分aに設けることにより、図柄の周囲が暗闇で高輝度に長時間自然発光するため、標示板1の存在感や識別力を高めることができる。
【0021】
また、前記標示板1は、図2に示すように、道路や路側帯等の路面内に埋設したり、図3に示すように、道路や路側帯等の路面上に敷設して使用される。
【0022】
また、他の好適例として、図5に示すように、本発明の路面用標示板を自転車停止用の標示板Aとすることが好ましい。かかる標示板Aは、図柄a上に発光膜層11が設けられており、さらに図柄aおよび基材2の全面上にガラス膜層10が施されている。そのため、前記標示板Aを十字路や接触事故が多発する路面に埋設もしくは敷設することにより、標示板Aの存在感や識別力が高まり、夜間に発生する事故も軽減される。
【0023】
また、他の好適例として、図6に示すように、本発明の路面用標示板を、たばこ投げ捨て(ポイ捨て)禁止用の標示板Bとすることが好ましい。かかる標示板Bは、図柄a上に発光膜層11が設けられており、さらに図柄aおよび基材2の全面上にガラス膜層10が施されている。そのため、前記標示板Bを条例で制定されたたばこ投げ捨て区域の路面に埋設もしくは敷設することにより、標示板Bの存在感や識別力が高まり、地域の美化が図れると共に、たばこ投げ捨てによる火災発生を未然に防ぐことができる。
【0024】
【発明の効果】
以上説明してきたように、本発明の路面用標示板は、上述により以下に示す効果を奏するものである。
【0025】
道路や路側帯等の路面に埋設または敷設される標示板であって、該標示板は、ライナー紙とアルミフォイルとを接着し、かかるアルミフォイルの表面にバインダーを介在させてガラス球を設けた基材の表面に、単一あるいは多成分系の金属酸化物ガラス膜により形成されるガラス膜層を設けたことを特徴とするため、屋外に長期間設置しても、表面が摩耗したり図柄が剥離することがなく、さらに表面に塵埃が付着することを軽減して外観的劣化を防ぐことができる。
【0026】
また、前記基材とガラス膜層との間に、周囲の光を蓄え自然発光可能な蓄光剤による発光膜層を介在させたことにより、標示板が暗闇で高輝度に長時間自然発光するため、夜間において識別力や安全性を高めることができる。
【0027】
さらに、本発明の路面用標示板を自転車停止用の標示板やたばこ投げ捨て禁止用の標示板とすることにより、夜間に発生する自転車との接触事故やたばこ投げ捨てによる火災発生等を解消できる。
【図面の簡単な説明】
【図1】本発明の路面用標示板の拡大断面図である。
【図2】路面用標示板を路面内に埋設した断面図である。
【図3】路面用標示板を路面上に敷設した断面図である。
【図4】他の好適例を示す路面用標示板の拡大断面図である。
【図5】一部を欠切した自転車停止用の標示板の斜視図である。
【図6】一部を欠切したたばこ投げ捨て禁止用の標示板の斜視図である。
【符号の説明】
1・・・標示板
2・・・基材
3・・・ライナー紙
4・・・アルミフォイル
5・・・接着剤
6・・・バインダー
7・・・ガラス球
10・・ガラス膜層
11・・発光膜層
a・・・図柄
A・・・自転車停止用の標示板
B・・・たばこ投げ捨て禁止用の標示板
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sign board buried or laid on a road surface such as a road or a roadside zone, and in particular, a road surface capable of preventing abrasion and adhesion of dirt on the surface and capable of naturally emitting light with high luminance for a long time in the dark. It relates to a sign board for use.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a signboard installed on a road surface, there are a road signboard for vehicles and pedestrians, and a signboard describing regulations such as a non-smoking area and a bicycle parking area. In addition, there is a light-emitting road sign for embedding a road surface, which emits light in the dark to play a greater role in traffic safety at night (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-166213 (pages 1-3, FIG. 1)
[0004]
[Problems to be solved by the invention]
The road surface embedding light-emitting road sign of Patent Document 1 has a large number of irregularities formed on the surface of a transparent polycarbonate resin substrate, and a concave portion is formed on the entire back surface, and an electroluminescent panel is provided in the concave portion. It is formed by the silicone resin and the back cover being sequentially fitted. However, in the above-described road sign, there is a problem that an AC power supply for lighting or a power supply such as a solar cell is required to make the electroluminescence panel emit light, so that an operation cost is required and a manufacturing cost is relatively high. .
[0005]
In view of the above, the present invention prevents surface abrasion and pattern peeling, reduces dust and the like from adhering to the surface, and does not require an AC power supply for lighting. It is an object of the present invention to provide a road marking plate capable of emitting natural light.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is a sign plate embedded or laid on a road surface such as a road or a roadside zone, and the sign plate adheres a liner paper and an aluminum foil with an adhesive, A glass film layer formed of a single or multi-component metal oxide glass film is provided on the surface of a substrate in which glass spheres are provided with a binder interposed on the surface of such an aluminum foil. Therefore, even if the device is installed outdoors for a long period of time, the surface is not worn or the design is not peeled off, and furthermore, the adhesion of dust to the surface can be reduced, and the appearance can be prevented from deteriorating.
[0007]
In addition, a glass film layer formed by a metal oxide glass film is treated with a hydrolyzable organometallic compound in a reaction solution of water and an organic solvent in the presence of boron ions in the presence of halogen ions as a catalyst to adjust the pH to 4. The reaction product is formed by hydrolysis and dehydration condensation while adjusting the concentration to 5 to 5.0, and is formed by a film layer formed by vitrification at a temperature of 200 ° C. or less.
[0008]
In addition, since the light-emitting film layer made of a luminous agent capable of storing ambient light and capable of natural light emission is interposed between the base material and the glass film layer, the sign plate emits natural light with high brightness in the dark for a long time. In addition, discrimination and safety can be improved at night.
[0009]
Furthermore, by making the road surface signboard of the present invention a signboard for stopping a bicycle or a signboard for prohibiting tobacco throwing away, it is possible to eliminate a contact accident with a bicycle occurring at night or a fire caused by tobacco throwing away.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a road marking plate of the present invention will be described with reference to the drawings. 1 is an enlarged cross-sectional view of the road marking plate of the present invention, FIG. 2 is a state where the road marking plate is embedded in the road surface, FIG. 3 is a state where the road marking plate is laid on the road surface, and FIG. 5 is an enlarged sectional view of a road sign board showing another preferred embodiment, FIG. 5 is a partially cut-away sign board for stopping a bicycle, and FIG. 6 is a partially cut-away sign board for preventing tobacco throwing away. .
[0011]
The road marking plate of the present invention shown in FIG. 1 is buried or laid on a road surface such as a road or a roadside zone, and the marking plate 1 is a single or multi-component metal oxide A glass film layer 10 formed of a material glass film is provided.
[0012]
The base material 2 adheres a liner paper 3 and a thin flexible aluminum foil 4 via an adhesive 5, and a binder 6 is interposed on the surface of the aluminum foil 4 to uniformly form a glass ball 7 having high reflectance. (Coating).
[0013]
The glass film layer 10 is formed of a single or multi-component metal oxide glass film provided so as to coat the surface of the substrate 2. The surface of the glass film layer 10 made of this metal oxide glass is extremely smooth like a normal glass surface, and has a sufficient luster to reflect light like a mirror surface. ing.
[0014]
Further, the glass film layer 10 is also excellent in light transmittance, and does not reduce the optical power of light passing through the glass film layer 10 at all. In addition, the glass film layer 10 has extremely excellent weather resistance, so that the glass itself does not discolor or become cloudy even when exposed to wind and rain outdoors for a long time, and furthermore, dust and soot do not penetrate into the inside, There is no deterioration in appearance.
[0015]
In addition, it has been confirmed that the metal oxide glass forming the glass film layer 10 has a photocatalytic effect similarly to titanium oxide and silicon oxide. As is well known, the photocatalytic effect is capable of decomposing and removing dirt substances and odorous substances when light is received. Therefore, by applying a photocatalytic effect to the surface of the sign plate 1, the generation of dirt can be suppressed, The surface is not worn and the design does not peel.
[0016]
In order to form the glass film layer 10, a hydrolyzable organometallic compound is prepared in advance in a reaction solution of water and an organic solvent in the presence of boron ions using a halogen ion as a catalyst to adjust the pH to 4.5 to 5. The reaction product is produced by hydrolysis and dehydration-condensation while adjusting the pH to 0.0. Then, this reaction product is applied to the surface of the base material 2 by a predetermined thickness, and is vitrified at a temperature of 200 ° C. or less to form a glass film. The method for forming the metal oxide glass is a known technique described in JP-A-6-199528 (Japanese Patent No. 2538527).
[0017]
The glass film layer 10 can be easily applied to the surface of the substrate 2 by appropriately diluting and spraying with a general-purpose spray.
[0018]
As another preferred example, as shown in FIG. 4, a light-emitting film layer 11 made of a light-storing agent capable of storing ambient light and emitting natural light is interposed between the substrate 2 and the glass film layer 10.
[0019]
The light-emitting film layer 11 is made of a light-storing agent capable of storing light and capable of spontaneous light emission. The light-storing agent is formed by mixing a plurality of well-known metal compounds and rare earths with a general-purpose coloring agent. . The layer width of the light emitting film layer 11 is such that after sunset, even if the surroundings are dark, it is possible to emit sufficient light power to check the surroundings, and to emit light until night is over. The layer has a thickness required to secure a light emission time (about 10 hours), and has a layer width formed by spraying 3 to 5 g of a luminous agent on a 10 cm square.
[0020]
By providing the light-emitting film layer 11 in, for example, the pattern portion a, the periphery of the pattern naturally emits light with high luminance for a long time in the dark, so that the presence and the discriminating power of the sign board 1 can be enhanced.
[0021]
The marking plate 1 is used by being buried in a road surface such as a road or a roadside zone as shown in FIG. 2, or laid on a road surface such as a road or a roadside zone as shown in FIG. .
[0022]
As another preferred example, as shown in FIG. 5, it is preferable that the road surface marking plate of the present invention is a bicycle stopping sign plate A. In the marking plate A, a light-emitting film layer 11 is provided on a design a, and a glass film layer 10 is provided on the entire surface of the design a and the base material 2. Therefore, by burying or laying the signboard A on a crossroad or on a road surface where contact accidents frequently occur, the presence of the signboard A and discrimination power are increased, and accidents occurring at night are reduced.
[0023]
As another preferred example, as shown in FIG. 6, it is preferable that the road marking plate of the present invention is a marking plate B for preventing tobacco throwing (littering). In the marking plate B, a light emitting film layer 11 is provided on a design a, and a glass film layer 10 is provided on the entire surface of the design a and the base material 2. Therefore, by burying or laying the signboard B on the road surface of the tobacco throwing area prescribed by the regulations, the presence and discriminating power of the signboard B is enhanced, the beautification of the area can be achieved, and a fire caused by tobacco throwing away can be achieved. It can be prevented beforehand.
[0024]
【The invention's effect】
As described above, the road marking plate of the present invention has the following effects as described above.
[0025]
A sign board buried or laid on a road surface such as a road or a roadside zone, wherein the sign board adheres a liner paper and an aluminum foil, and a glass ball is provided on the surface of the aluminum foil with a binder interposed therebetween. A glass film layer formed of a single or multi-component metal oxide glass film is provided on the surface of the base material. Can be prevented from peeling off, and furthermore, the adhesion of dust to the surface can be reduced to prevent the appearance from deteriorating.
[0026]
In addition, since the light-emitting film layer made of a luminous agent capable of storing ambient light and emitting natural light is interposed between the base material and the glass film layer, the signboard emits natural light for a long time with high brightness in the dark. In addition, discrimination and safety can be improved at night.
[0027]
Furthermore, by making the road surface signboard of the present invention a signboard for stopping a bicycle or a signboard for prohibiting tobacco throwing away, it is possible to eliminate a contact accident with a bicycle occurring at night or a fire caused by tobacco throwing away.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of a road marking plate of the present invention.
FIG. 2 is a cross-sectional view in which a road marking plate is embedded in a road surface.
FIG. 3 is a cross-sectional view in which a road marking plate is laid on a road.
FIG. 4 is an enlarged sectional view of a road marking plate showing another preferred example.
FIG. 5 is a perspective view of a sign plate for stopping a bicycle with a part cut away.
FIG. 6 is a perspective view of a partially cut-out sign board for preventing tobacco throwing away.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Marking plate 2 ... Base material 3 ... Liner paper 4 ... Aluminum foil 5 ... Adhesive 6 ... Binder 7 ... Glass sphere 10 ... Glass film layer 11 ... Light-emitting film layer a ... Design A ... Sign plate for stopping the bicycle B ... Sign plate for preventing tobacco throwing away

Claims (5)

道路や路側帯等の路面に埋設または敷設される標示板であって、該標示板は、ライナー紙とアルミフォイルとを接着剤にて接着し、かかるアルミフォイルの表面にバインダーを介在させてガラス球を設けた基材の表面に、単一あるいは多成分系の金属酸化物ガラス膜により形成されるガラス膜層を設けたことを特徴とする路面用標示板。A sign board buried or laid on a road surface such as a road or a roadside zone. A road marking plate, wherein a glass film layer formed of a single or multi-component metal oxide glass film is provided on a surface of a base material provided with spheres. 前記ガラス膜層は、加水分解可能な有機金属化合物を、水と有機溶媒の反応液中で、ホウ素イオンの存在下、ハロゲンイオンを触媒にしpHを4.5ないし5.0に調整しつつ加水分解、脱水縮合して反応生成物を生成し、200度以下の温度でガラス化してなる膜層により形成したことを特徴とする請求項1記載の路面用標示板。The glass film layer is prepared by adding a hydrolyzable organometallic compound to a reaction solution of water and an organic solvent while adjusting the pH to 4.5 to 5.0 using a halogen ion as a catalyst in the presence of boron ions. The road surface signboard according to claim 1, wherein the signboard is formed by a film layer formed by decomposing, dehydrating and condensing to produce a reaction product, and vitrifying at a temperature of 200 ° C or lower. 前記基材とガラス膜層との間に、周囲の光を蓄え自然発光可能な蓄光剤による発光膜層を介在させた請求項1記載の路面用標示板。The road surface signboard according to claim 1, wherein a light-emitting film layer made of a light-storing agent capable of storing ambient light and emitting natural light is interposed between the base material and the glass film layer. 前記標示板は、自転車停止用の標示板である請求項1乃至3記載の路面用標示板。The road sign board according to claim 1, wherein the sign board is a sign board for stopping a bicycle. 前記標示板は、たばこ投げ捨て禁止用の標示板である請求項1乃至3記載の路面用標示板。The road signboard according to claim 1, wherein the signboard is a signboard for prohibiting tobacco throwing away.
JP2003117650A 2003-03-18 2003-03-18 Sign board for road surface Pending JP2004278274A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008163560A (en) * 2006-12-27 2008-07-17 Mkk:Kk Road surface marking body and method of producing the same
JP2010024677A (en) * 2008-07-17 2010-02-04 Konishi Co Ltd Sticking structure of marking sheet to road surface
JP2021130961A (en) * 2020-02-19 2021-09-09 古河電気工業株式会社 Road surface display material and road surface light-emitting material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008163560A (en) * 2006-12-27 2008-07-17 Mkk:Kk Road surface marking body and method of producing the same
JP2010024677A (en) * 2008-07-17 2010-02-04 Konishi Co Ltd Sticking structure of marking sheet to road surface
JP2021130961A (en) * 2020-02-19 2021-09-09 古河電気工業株式会社 Road surface display material and road surface light-emitting material

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