JPH0121561B2 - - Google Patents
Info
- Publication number
- JPH0121561B2 JPH0121561B2 JP55074278A JP7427880A JPH0121561B2 JP H0121561 B2 JPH0121561 B2 JP H0121561B2 JP 55074278 A JP55074278 A JP 55074278A JP 7427880 A JP7427880 A JP 7427880A JP H0121561 B2 JPH0121561 B2 JP H0121561B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- thin film
- multilayer thin
- light source
- film filter
- 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.)
- Expired
Links
- 239000010409 thin film Substances 0.000 claims description 28
- 239000003550 marker Substances 0.000 claims description 17
- 238000005452 bending Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/18—Visual or acoustic landing aids
- B64F1/20—Arrangement of optical beacons
- B64F1/205—Arrangement of optical beacons arranged underground, e.g. underground runway lighting units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/18—Visual or acoustic landing aids
- B64F1/20—Arrangement of optical beacons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
- F21W2111/06—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for aircraft runways or the like
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は色フイルタを用いて色光を投射する標
識灯の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a marker lamp that projects colored light using a color filter.
（従来の技術）
たとえば飛行場の滑走路に埋設されて使用され
る標識灯には色フイルタを用いて色光を投射する
ものがある。そうして、近時色フイルタとして多
層薄膜フイルタが多用されてきた。この多層薄膜
フイルタはたとえばZnS・MgF2など光屈折率を
異にする複数の干渉性薄膜を透明基板上に交互重
層して形成したもので、干渉によつて透過光を所
望に着色するものである。(Prior Art) For example, some marker lights used by being buried in the runways of airports project colored light using color filters. In recent years, multilayer thin film filters have been widely used as color filters. This multilayer thin film filter is formed by alternately layering multiple coherent thin films with different optical refractive indexes, such as ZnS and MgF 2 , on a transparent substrate, and colors the transmitted light as desired by interference. be.
（発明が解決しようとする問題点）
この多層薄膜フイルタは光透過率が高い利点が
ある反面、光の透過角度すなわち透過光束がフイ
ルタの透過点における法線となす角度が大きくな
ると透過光の光色にずれが生じ、見る角度によつ
て光色が異なつて見える欠点を有している。(Problem to be Solved by the Invention) Although this multilayer thin film filter has the advantage of high light transmittance, when the transmission angle of light, that is, the angle that the transmitted light flux makes with the normal line at the transmission point of the filter becomes large, the transmitted light becomes This has the disadvantage that color shifts occur and the color of the light appears different depending on the viewing angle.
そうして、標識灯としてたとえば緑色光を投射
するものでは、その緑色光が第１図に示す
JISW8307−1955「航空標識の色」で規定する色度
範囲内にある必要がある。たとえば第１図中＋印
で示すように、光源の色温度が2856〓の場合θ＝
0゜から30゜までは緑色光の色度は規格内に入つて
いるが、それ以上では明らかに規格範囲を外れて
しまう。このため、フイルタへの入射角度を30゜
以内にする必要がある。 In the case of a marker light that projects green light, for example, the green light is shown in Figure 1.
It must be within the chromaticity range specified in JISW8307-1955 "Color of Aircraft Signs". For example, as shown by the + mark in Figure 1, if the color temperature of the light source is 2856〓, θ=
The chromaticity of green light is within the standard from 0° to 30°, but beyond that it clearly falls outside the standard range. Therefore, it is necessary to keep the angle of incidence on the filter within 30°.
このため、特願昭54−35515号（特開昭55−
129510号）に示されるように、光源に対設された
反射鏡の前方に多層薄膜フイルタを配設し、さら
にその前方に凹レンズを配設して構成したものが
提案されている。このものは、反射鏡によつて光
源からの光の大部分を集光して多層薄膜フイルタ
への入射角度を30゜以下になるようにし、その後
標識灯の規格配光を満足させるために色光を凹レ
ンズによつて拡げている。したがつて、このもの
は反射鏡を利用することによつて多層薄膜フイル
タへの入射角度を小さくおさえるものであるた
め、反射鏡を必要とし、部品点数が多くなる不都
合があり、また、１個の光源を用いて複数方向に
色光を投射する標識灯では反射鏡を使用できない
かまたは充分な大きさの反射鏡を使用できず、多
層薄膜フイルタへの入射角度が大きくなりJISで
規定する範囲内に抑えることが困難となる不都合
がある。さらに、光源の利用効率を高めるため
に、広い範囲の直射光を利用しようとすれば、多
層薄膜フイルタへの入射角度が大きくなり、標識
灯の規格配光範囲内の色光の色度変化をJISで規
定する範囲内に抑えることが困難となることなど
が判り、反射鏡を特に必要とせず、多層薄膜フイ
ルタへの入射角度が小さくなるような標識灯が望
まれていた。 For this reason, Japanese Patent Application No. 54-35515
No. 129510), it has been proposed that a multilayer thin film filter is disposed in front of a reflecting mirror placed opposite to the light source, and a concave lens is further disposed in front of it. This device focuses most of the light from the light source using a reflector so that the angle of incidence on the multilayer thin film filter is 30 degrees or less, and then uses colored light to satisfy the standard light distribution for marker lights. is magnified by a concave lens. Therefore, since this method uses a reflector to reduce the angle of incidence on the multilayer thin film filter, it requires a reflector and has the disadvantage of increasing the number of parts. For marker lights that use a light source to project colored light in multiple directions, it is not possible to use a reflector or a reflector of sufficient size cannot be used, and the angle of incidence on the multilayer thin film filter becomes large and falls within the range specified by JIS. There is an inconvenience that it is difficult to suppress the Furthermore, if we try to use a wide range of direct light in order to increase the efficiency of light source use, the angle of incidence on the multilayer thin film filter will increase, and the chromaticity change of colored light within the standard light distribution range of marker lights will be reduced by JIS. It was found that it was difficult to keep the light within the range specified by , and there was a desire for a marker light that did not particularly require a reflecting mirror and would reduce the angle of incidence on the multilayer thin film filter.
一方、実公昭51−13025号公報に示されるよう
に、わん曲状に形成されたレンズ内面に干渉膜を
設た車軸用補助灯が提案されている。 On the other hand, as shown in Japanese Utility Model Publication No. 51-13025, an auxiliary light for an axle has been proposed in which an interference film is provided on the inner surface of a curved lens.
この実公昭51−13025号公報に示されるものは、
光源からの光を反射体で略平行光線で照射するよ
うにしたもので、干渉膜に入射する入射角度をレ
ンズの中央部から端部にわたつて異ならせて、見
る領域によつて色が異なつて見えるようにしたも
のである。 What is shown in this Utility Model Publication No. 51-13025 is:
A reflector is used to irradiate light from a light source in approximately parallel rays, and the angle of incidence on the interference film is varied from the center to the edges of the lens, resulting in different colors depending on the viewing area. It is made to look straight.
したがつて、標識灯のように、見る領域によつ
て色光にずれが生じないようにしなければならな
いものにおいては、適用できないものである。 Therefore, it cannot be applied to devices such as marker lights where it is necessary to prevent color light from shifting depending on the viewing area.
本発明は上述の事情を考慮してなされたもの
で、反射鏡を特に必要とせず、多層薄膜フイルタ
を透過した色光の色度変化が少なくなるようにし
た標識灯を提供することを目的とする。 The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a marker light that does not particularly require a reflecting mirror and that reduces the change in chromaticity of colored light transmitted through a multilayer thin film filter. .
［発明の構成］
（問題点を解決するための手段）
本発明は発光源を中心として放射状に光照射す
る光源に対設して、光源からの光の入射角度が
30゜以下になるようにわん曲した多層薄膜フイル
タを光源と対設し光源からの放射状の光が略平行
に入射するようにしたことを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention is arranged opposite to a light source that emits light radially around the light emitting source, so that the incident angle of the light from the light source is adjusted.
It is characterized in that a multilayer thin film filter curved at an angle of 30 degrees or less is placed opposite the light source so that radial light from the light source is incident approximately in parallel.
（作用）
光源から発した放射状の光はフイルタの曲面に
入射角度が30゜以下で入射し、フイルタをとおり
所望の光色で光導出窓から外方に導出される。(Function) The radial light emitted from the light source enters the curved surface of the filter at an angle of incidence of 30 degrees or less, passes through the filter, and is led out from the light guide window in the desired light color.
そして、光源からの放射状の光はフイルタの凹
面に入射する入射角度は若干の幅があるが略平行
に入射するように構成しているので、見る領域に
よつて色光の色変化が少ない標識光を放射でき
る。 The radial light from the light source enters the concave surface of the filter at a slightly different angle of incidence, but it is configured so that it is almost parallel, so the marker light has little color change depending on the viewing area. can be emitted.
（実施例）
以下、本発明の詳細を第２図に基づいて説明す
る。第２図は本発明を適用してなる埋込み形標識
灯を概略図に示した平面断面図である。１は灯体
で、この灯体１はたとえば円盤状に形成されてい
る。２は灯体１の上面に形成された光導出窓で、
本実施例では２方向に投射し得るように２個所に
形成されている。３は光源で、この光源３はたと
えばハロゲン電球で、点光源に近い発光源を有し
この発光源を中心として放射状に光照射するよう
に形成されている。この光源３は上記灯体１内に
上記光導出窓２に対向して配設されている。４は
光源３に対向して配設された多層薄膜フイルタ
で、この多層薄膜フイルタ４は詳図しないが、た
とえば透明基板上に光屈折率を異にする複数の干
渉性薄膜を積層して緑色光を導出するように形成
されている。この多層薄膜フイルタ４は光源３か
らの放射状の光の入射角度θが30゜以下、好まし
くは25゜以下になるようにわん曲状に屈曲形成さ
れ、凹面を光源３側に向けて光源３と対向して配
設されている。そして、このフイルタ４は光源３
からの放射状の光が中央部での入射角θが0゜、光
が端部においても入射角度θが30゜以下で入射す
るようにしている。すなわち、フイルタ４の一点
を注目したとき、光源からの光が種々の角度から
入射しないようにし、見る領域によつて色光が異
なつて見えないようにしている。５は透光部材
で、この透光部材５はたとえばガラス材で環状に
形成され、灯体１の光導出窓２に対向する部分を
レンズ部６に形成している。上記レンズ部６は規
格配光たとえば国際民間航空機構のカテゴリー
緑色光の水平方向±20.25゜の範囲を満足させ、か
つ、レンズ部６の最外周部で水平方向20゜近傍の
光が得られるようにするとともに水平方向ψ50゜の
光を利用し得るように設計されることを可として
いる。なお、フイルタ４は光源４からの光の入射
角度θが30゜を超えると見る領域によつて光色が
異なつて見える不都合が生じる。(Example) The details of the present invention will be explained below based on FIG. 2. FIG. 2 is a plan sectional view schematically showing an embedded type marker lamp to which the present invention is applied. 1 is a lamp body, and this lamp body 1 is formed into, for example, a disk shape. 2 is a light guide window formed on the top surface of the lamp body 1;
In this embodiment, they are formed at two locations so that projection can be performed in two directions. Reference numeral 3 denotes a light source, and this light source 3 is, for example, a halogen light bulb, and is formed to have a light emitting source close to a point light source and to emit light radially around this light emitting source. This light source 3 is disposed within the lamp body 1 so as to face the light guide window 2 . Reference numeral 4 denotes a multilayer thin film filter disposed facing the light source 3. Although the multilayer thin film filter 4 is not shown in detail, for example, a plurality of coherent thin films having different optical refractive indexes are laminated on a transparent substrate to produce a green color. It is formed to guide light. This multilayer thin film filter 4 is bent into a curved shape so that the incident angle θ of radial light from the light source 3 is 30° or less, preferably 25° or less, and the concave surface faces the light source 3 side. are placed facing each other. And this filter 4 is the light source 3
The radial light is made to enter at an incident angle θ of 0° at the center, and the incident angle θ is 30° or less at the ends. That is, when looking at one point on the filter 4, the light from the light source is prevented from entering from various angles, so that the colored light does not appear to differ depending on the viewing area. Reference numeral 5 denotes a light-transmitting member, and the light-transmitting member 5 is made of, for example, a glass material and is formed into an annular shape, and the portion facing the light guide window 2 of the lamp body 1 is formed into a lens portion 6 . The lens portion 6 is designed to satisfy the standard light distribution, for example, the range of ±20.25° in the horizontal direction of category green light of the International Civil Aviation Organization, and to obtain light in the vicinity of 20° in the horizontal direction at the outermost periphery of the lens portion 6. In addition, it is possible to design it so that it can utilize light at an angle of ψ50° in the horizontal direction. Note that when the incident angle θ of the light from the light source 4 exceeds 30°, the filter 4 has the disadvantage that the color of the light appears different depending on the viewing area.
つぎに本実施例の作用について説明する。光源
３から発した放射状の光は多層薄膜フイルタ４を
とおり所望の光色、本実施例では緑色光になつて
透光部材５のレンズ部６を透過して光導出窓２か
ら外方に導出される。そして、多層薄膜フイルタ
４に入射する光はフイルタ４が入射角度30゜以下
にわん曲状に形成されているので、入射角に若干
の幅があるものの略平行に入射するようにしてい
るので、第１図に示されるJISの規格色度範囲内
にあり、見る角度による光色のずれが少なく、所
望の光色が得られる。しかも、反射鏡を特に必要
としないので、複数方向へ照射するものにあつて
はその効果が大きいものである。 Next, the operation of this embodiment will be explained. The radial light emitted from the light source 3 passes through the multilayer thin film filter 4, becomes a desired light color, green light in this embodiment, passes through the lens portion 6 of the light transmitting member 5, and is led out from the light guide window 2. Ru. Since the filter 4 is formed into a curved shape with an incident angle of 30 degrees or less, the light incident on the multilayer thin film filter 4 is made to be incident almost parallel, although there is a slight width in the incident angle. It is within the JIS standard chromaticity range shown in FIG. 1, and there is little deviation in light color depending on the viewing angle, allowing the desired light color to be obtained. Furthermore, since no reflecting mirror is particularly required, the effect is great when irradiating in multiple directions.
本発明を以上図示実施例に基づいて詳述した
が、本発明は種々の実施態様を許容する。 Although the present invention has been described above in detail based on the illustrated embodiments, the present invention allows various embodiments.
たとえば、多層薄膜フイルタは平板状の複数個
の小片をそれぞれが光源からの光の入射角度が
30゜以下となるようにわん曲状に連設して形成し
てもよい。また、多層薄膜フイルタは板状体の両
端近傍を屈曲してわん曲状に形成してもよく、さ
らにまた、環状にわん曲形成したものであつても
よい。さらに、光源は複数個であつてもよく、反
射鏡とレンズ部はなくてもよい。さらにまた、透
光部材のレンズ部はなくてもよい。また、標識灯
は地上に取付けるものであつてもよい。 For example, a multilayer thin film filter consists of multiple small flat pieces, each with a different angle of incidence for the light from the light source.
They may be formed in a continuous curved manner so that the angle is 30° or less. Further, the multilayer thin film filter may be formed into a curved shape by bending the vicinity of both ends of the plate-like body, or may be formed into a curved shape into an annular shape. Furthermore, there may be a plurality of light sources, and the reflecting mirror and lens portion may not be provided. Furthermore, the lens portion of the light-transmitting member may not be provided. Further, the marker light may be mounted on the ground.
［発明の効果］
以上詳述したように、本発明は発光源を中心と
して放射状に光照射する光源に対設して光源から
の光の入射角度が30゜以下になるようにわん曲し
た多層薄膜フイルタを光源と対設し光源からの放
射状の光が略平行に光が入射するようにしたの
で、広い角度範囲にわたつて光色のずれの少ない
標識光を放射でき、光源の利用効率を高めること
ができるとともに複数方向への照射も可能とな
る。また、多層薄膜フイルタはわん曲状に形成し
放射状に光照射する光源と対設すればよいので構
造が簡単で製作も容易となり安価に提供できる。[Effects of the Invention] As described in detail above, the present invention provides a multilayer structure that is curved so that the incident angle of light from the light source is 30° or less when the light source emits light radially around the light source. A thin film filter is placed opposite the light source so that the radial light from the light source enters in approximately parallel fashion, making it possible to emit marker light with little deviation in light color over a wide angular range, increasing the efficiency of light source use. It is possible to increase the amount of light and irradiate in multiple directions. Further, since the multilayer thin film filter is formed into a curved shape and only needs to be placed in opposition to a light source that emits light radially, the structure is simple, easy to manufacture, and can be provided at low cost.
第１図はJISw8301−1955「航空標識の色」で規
定する緑色の色度図、第２図は本発明の一実施例
を概略的に示す平面断面図である。
１……灯体、２……光導出窓、３……光源、４
……多層薄膜フイルタ。
FIG. 1 is a chromaticity diagram of green defined by JISw8301-1955 "Color of Aviation Signs", and FIG. 2 is a plan cross-sectional view schematically showing an embodiment of the present invention. 1... Lamp body, 2... Light guide window, 3... Light source, 4
...Multilayer thin film filter.
Claims (1)
源を中心として放射状に光照射する光源と； この光源からの光の入射角度が30゜以下になる
ようにわん曲状に形成され上記光源と対設した多
層薄膜フイルタと； を具備したことを特徴とする標識灯。 ２ 前記多層薄膜フイルタは板状体をわん曲状に
屈曲形成したことを特徴とする特許請求の範囲１
記載の標識灯。 ３ 前記多層薄膜フイルタは平板状の複数個の小
片をわん曲状に連設して形成したことを特徴とす
る特許請求の範囲１記載の標識灯。 ４ 前記多層薄膜フイルタは板状体の両端近傍を
屈曲してわん曲状に形成したことを特徴とする特
許請求の範囲１記載の標識灯。 ５ 前記多層薄膜フイルタは環状にわん曲形成し
たことを特徴とする特許請求の範囲１記載の標識
灯。[Claims] 1. A lamp body provided with a light emitting window; A light source disposed opposite to the light emitting window in the lamp body and emitting light radially around the light emitting source; An incident angle of light from this light source is 30 A marker light characterized by comprising: a multilayer thin film filter formed in a curved shape so as to have an angle of less than .degree. and placed opposite to the light source; 2. Claim 1, wherein the multilayer thin film filter is formed by bending a plate-like body into a curved shape.
Signal light as described. 3. The marker lamp according to claim 1, wherein the multilayer thin film filter is formed by connecting a plurality of small flat pieces in a curved shape. 4. The marker lamp according to claim 1, wherein the multilayer thin film filter is formed into a curved shape by bending the vicinity of both ends of a plate-shaped body. 5. The marker lamp according to claim 1, wherein the multilayer thin film filter is curved into an annular shape.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7427880A JPS57684A (en) | 1980-06-04 | 1980-06-04 | Mark lamp |
| GB8115640A GB2079433A (en) | 1980-06-04 | 1981-05-21 | Marker light suitable for airport runways |
| BE0/204934A BE889007A (en) | 1980-06-04 | 1981-05-27 | LIGHT BEACON |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7427880A JPS57684A (en) | 1980-06-04 | 1980-06-04 | Mark lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57684A JPS57684A (en) | 1982-01-05 |
| JPH0121561B2 true JPH0121561B2 (en) | 1989-04-21 |
Family
ID=13542475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7427880A Granted JPS57684A (en) | 1980-06-04 | 1980-06-04 | Mark lamp |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS57684A (en) |
| BE (1) | BE889007A (en) |
| GB (1) | GB2079433A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2525500Y2 (en) * | 1991-06-17 | 1997-02-12 | 株式会社東芝 | Electronics |
| RU2223444C2 (en) * | 2002-03-04 | 2004-02-10 | Крапивин Владимир Леонтьевич | Source of polarized radiation |
| JP4714579B2 (en) * | 2005-12-26 | 2011-06-29 | セイコーインスツル株式会社 | clock |
| GB0808424D0 (en) * | 2008-05-09 | 2008-06-18 | Caa Internat Ltd | Lighting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113025U (en) * | 1974-07-16 | 1976-01-30 |
-
1980
- 1980-06-04 JP JP7427880A patent/JPS57684A/en active Granted
-
1981
- 1981-05-21 GB GB8115640A patent/GB2079433A/en not_active Withdrawn
- 1981-05-27 BE BE0/204934A patent/BE889007A/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113025U (en) * | 1974-07-16 | 1976-01-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| BE889007A (en) | 1981-09-16 |
| JPS57684A (en) | 1982-01-05 |
| GB2079433A (en) | 1982-01-20 |
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