JPH09197112A - Optical filter - Google Patents
Optical filterInfo
- Publication number
- JPH09197112A JPH09197112A JP362596A JP362596A JPH09197112A JP H09197112 A JPH09197112 A JP H09197112A JP 362596 A JP362596 A JP 362596A JP 362596 A JP362596 A JP 362596A JP H09197112 A JPH09197112 A JP H09197112A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical filter
- filter
- resin
- optical fiber
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 53
- 239000012788 optical film Substances 0.000 claims abstract description 30
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 239000010408 film Substances 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 11
- 238000007796 conventional method Methods 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 13
- 230000001070 adhesive effect Effects 0.000 description 11
- 229920001721 polyimide Polymers 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000009719 polyimide resin Substances 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/29368—Light guide comprising the filter, e.g. filter deposited on a fibre end
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/241—Light guide terminations
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3845—Details of mounting fibres in ferrules; Assembly methods; Manufacture ferrules comprising functional elements, e.g. filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Filters (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【発明の属する技術分野】本発明は、光通信用光学フィ
ルタに関するもので、特に、光学多層膜フィルタに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical filter for optical communication, and more particularly to an optical multilayer filter.
【０００１】[0001]
【従来の技術】光通信用のデバイスとして、伝送する光
の波長を選択／抑止するため、誘電体多層膜等で構成さ
れる光学フィルタが使用されている。2. Description of the Related Art As a device for optical communication, an optical filter composed of a dielectric multilayer film or the like is used for selecting / suppressing the wavelength of light to be transmitted.
【０００２】従来の光通信用光学フィルタは、光ファイ
バの間や、光ファイバの端面に貼り付けられる等して光
路に配置され、通過信号の波長選択がなされている。光
学フィルタは、通常、ガラス基板やポリイミド樹脂の表
面にＳｉＯ２／ＴｉＯ２の誘電体多層膜として形成され
る。A conventional optical filter for optical communication is arranged in the optical path between the optical fibers or attached to the end face of the optical fiber, and the wavelength of the passing signal is selected. The optical filter is usually formed as a dielectric multi-layer film of SiO2 / TiO2 on the surface of a glass substrate or a polyimide resin.
【０００３】上述した従来の技術を示すものとして、例
えば実開昭５８−６２３０６号に記載の構成がある。図
７に示されるように、この光学フィルタは、ガラス基板
と光学膜から構成されており、外観上、表裏を見分けや
すいように、ガラス基板に切り欠きが形成されている。As a conventional technique described above, for example, there is a configuration described in Japanese Utility Model Laid-Open No. 58-62306. As shown in FIG. 7, this optical filter is composed of a glass substrate and an optical film, and a notch is formed in the glass substrate so that the front and the back can be easily distinguished from each other in appearance.
【０００４】[0004]
【発明が解決しようとする課題】ポリイミド等の樹脂の
表面に誘電体多層膜等の光学膜を形成した構造の光学フ
ィルタを光ファイバの先端面に貼り付ける時、光学膜の
境界条件の設定によっては、必要な光学特性を得るため
にはポリイミド等の樹脂側を外側にして、光学膜側を光
ファイバに接着剤を用いて貼り付けなければならない場
合がある。When an optical filter having a structure in which an optical film such as a dielectric multilayer film is formed on the surface of a resin such as polyimide is attached to the front end surface of an optical fiber, the boundary condition of the optical film is set. In some cases, in order to obtain the required optical characteristics, it may be necessary to attach the resin side such as polyimide to the outside and the optical film side to the optical fiber using an adhesive.
【０００５】ところが、光学フィルタは通常、数μｍ〜
数十μｍの厚さであるため、取り扱いにくいことに加
え、薄いために表面を観察したときよく似た外観である
ことから、熟練者でないとどちらの面がポリイミド等の
樹脂側であるか、あるいは光学膜側であるかを見分ける
ことが困難である。However, the optical filter is usually several μm or less.
Since it has a thickness of several tens of μm, it is difficult to handle, and because it is thin, it has a similar appearance when observing the surface. Therefore, which surface is the side of the resin such as polyimide unless an expert is used. Alternatively, it is difficult to distinguish whether it is on the optical film side.
【０００６】ここで、従来の光学フィルタの構造を図６
に示す。第１の樹脂１の表面に光学膜２が形成されてい
る。Here, the structure of a conventional optical filter is shown in FIG.
Shown in The optical film 2 is formed on the surface of the first resin 1.
【０００７】図４に示されるように、光ファイバ４が第
２の接着剤７で端末部材５の中心に接着固定されてお
り、第１の接着剤６を用いて光学膜２の面と光ファイバ
４が接着されている。光学膜の境界条件を対空気でなく
屈折率が約１．５である接着剤とした場合には、光学フ
ィルタの接着はこの向きでの接着固定によって行われな
いと、所要の光学特性が得られない。すなわち、図５に
示されるように、光学フィルタの表裏の方向が逆の場
合、所要の光学特性が得られない。As shown in FIG. 4, the optical fiber 4 is bonded and fixed to the center of the terminal member 5 with the second adhesive 7, and the surface of the optical film 2 and the optical film 2 are bonded with each other by using the first adhesive 6. The fiber 4 is bonded. When the boundary condition of the optical film is not air, but an adhesive with a refractive index of about 1.5, the optical filter must be adhered and fixed in this direction to obtain the required optical characteristics. I can't. That is, as shown in FIG. 5, when the front and back directions of the optical filter are opposite, the required optical characteristics cannot be obtained.
【０００８】本発明は、上述したように光学フィルタの
特性が、フィルタ貼り付けの向きによって変わってしま
う点、あるいは正規の向きに貼り付けようとした場合に
熟練を要し、生産性が低下してしまう点に鑑みて、貼り
付けの向きに依存しないで表裏で同一の特性を得る光学
フィルタを提供することを目的とする。The present invention, as described above, requires that the characteristics of the optical filter change depending on the direction of the filter attachment, or that skill is required when trying to attach the filter in the proper direction, and the productivity decreases. In view of this, it is an object of the present invention to provide an optical filter that obtains the same characteristics on the front and back sides without depending on the attachment direction.
【０００９】[0009]
【課題を解決するための手段】本発明の光学フィルタ
は、上記欠点を除去するために、第１の平板とこの第１
の平板の表面に形成された光学膜と光学膜の上面に配置
された第２の平板とを含むことを特徴としている。そし
て、第１の平板および第２の平板は樹脂により形成され
ていることを特徴としている。また、第１の平板および
第２の平板はその厚みがそれぞれ１００μｍ以下である
ことを特徴としている。より具体的な構成の一例として
は、ポリイミド樹脂等の第１の樹脂１の表面に誘電体多
層膜等の光学膜２を形成し、さらにその上面にエポキシ
系の接着剤またはポッティング剤等の第２の樹脂３がコ
ーティングされる構成が採用されている。ここで、第２
の樹脂３には、使用する伝送する光の波長に対して通過
特性に問題がなく、かつ光の反射が発生しにくい様に光
ファイバ４の屈折率に近い材料が選択される。The optical filter of the present invention has a first flat plate and a first flat plate in order to eliminate the above-mentioned drawbacks.
It is characterized in that it includes an optical film formed on the surface of the flat plate and a second flat plate arranged on the upper surface of the optical film. The first flat plate and the second flat plate are formed of resin. The first flat plate and the second flat plate are each characterized in that their thickness is 100 μm or less. As an example of a more specific configuration, an optical film 2 such as a dielectric multilayer film is formed on the surface of a first resin 1 such as a polyimide resin, and a top surface of the optical film 2 such as an epoxy adhesive or potting agent is further formed. The structure in which the resin 3 of 2 is coated is adopted. Here, the second
The resin 3 is selected from a material having a refractive index close to that of the optical fiber 4 so that there is no problem in the transmission characteristics with respect to the wavelength of the light to be used and the light is less likely to be reflected.
【００１０】[0010]
【作用】第１の樹脂１の表面に光学膜２が形成された構
造の光学フィルタが、光ファイバ４の先端に貼り付けら
れる際、必要な光学特性を得るために第１の樹脂１側は
外側にして、光学膜２側は光ファイバ４に第１の接着剤
６等が用いられて貼り付けられる。光学膜２の光学特性
は、これに接触する樹脂または接着剤の屈折率や波長特
性により影響される。つまり、図４に示されるように、
光学膜２が第１の接着剤６に接触して光ファイバ４に接
着されている場合と、図５に示されるように、光学膜２
が光ファイバ４の反対側に位置して、空気と接触してい
る場合とで、光の通過特性が異なる。When the optical filter having the structure in which the optical film 2 is formed on the surface of the first resin 1 is attached to the tip of the optical fiber 4, the first resin 1 side is provided in order to obtain necessary optical characteristics. On the outside, the optical film 2 side is attached to the optical fiber 4 using the first adhesive 6 or the like. The optical characteristics of the optical film 2 are affected by the refractive index and wavelength characteristics of the resin or adhesive that contacts the optical film 2. That is, as shown in FIG.
When the optical film 2 is in contact with the first adhesive 6 and adhered to the optical fiber 4, and as shown in FIG.
Is located on the opposite side of the optical fiber 4 and is in contact with air, the light transmission characteristics are different.
【００１１】本発明は、光学フィルタを表裏どちらの面
で接着しても良い様に、あらかじめ光学膜２の表面に、
第２の樹脂３がコーティングされた構造となっている。
すなわち、第２の樹脂３の材料として、第１の接着剤６
と同じか同等の材料を用い、使用する伝送する光の波長
に対して通過特性に問題がなく、かつ光の反射が発生し
にくい様に光ファイバ４の屈折率に近い材料が選択され
る。これにより、図３に示されるように、仮に、第１の
樹脂１が光ファイバ４の側に位置して接着されても、光
学膜２の表面には常に第２の樹脂３があるため、光学膜
２は第２図の場合と同じ特性を示す作用がある。つま
り、図２にしめされるように、光ファイバ４に接着され
ても、図３に示されるように、光ファイバ４に接着され
ても、光学特性は同じになる作用が働く。According to the present invention, the surface of the optical film 2 is previously attached so that the optical filter may be adhered on either the front side or the back side.
The structure is such that the second resin 3 is coated.
That is, as the material of the second resin 3, the first adhesive 6
The same or equivalent material is used, and a material having a refractive index close to that of the optical fiber 4 is selected so that there is no problem in the transmission characteristics with respect to the wavelength of the light to be used and the light is less likely to be reflected. As a result, as shown in FIG. 3, even if the first resin 1 is located on the optical fiber 4 side and bonded, the second resin 3 is always present on the surface of the optical film 2, The optical film 2 has the function of exhibiting the same characteristics as in the case of FIG. That is, as shown in FIG. 2, even if the optical fiber 4 is adhered to the optical fiber 4, or the optical fiber 4 is adhered to the optical fiber 4 as shown in FIG.
【００１２】[0012]
【発明の実施の形態】本発明の光学フィルタを図面を参
照して、詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical filter of the present invention will be described in detail with reference to the drawings.
【００１３】図１は、本発明の光学フィルタの一実施例
を示している。数μｍの厚さのポリイミド樹脂等の第１
の樹脂１の表面にＳｉＯ２／ＴｉＯ２の誘電体多層膜等
の光学膜２を蒸着等の方法で形成し、さらにその表面
に、スピンコート等の方法で、第２の樹脂３が数μｍの
厚さで形成される。FIG. 1 shows an embodiment of the optical filter of the present invention. First such as polyimide resin with a thickness of several μm
The optical film 2 such as a dielectric multilayer film of SiO2 / TiO2 is formed on the surface of the resin 1 of 1 above by a method such as vapor deposition, and the surface of the second resin 3 is formed to a thickness of several μm by a method such as spin coating. Is formed by.
【００１４】上記構造で、光学膜の種類を変えることに
より、ハイパスフィルタ、ロウパスフィルタ、バンドパ
スフィルタを構成することができる。第２の樹脂３の材
料としては、第１の接着剤６や第１の樹脂１と同じかま
たは光学的な特性が同等の材料を用い、伝送する光の波
長に対して通過特性に問題がなく、かつ光の反射が発生
しにくい様に光ファイバ４の屈折率に近い材料が選択さ
れる。また、第２の樹脂３に使用する材料の膨張係数
が、光学膜３または光ファイバ４に近いと、温度特性が
良くなる。With the above structure, a high-pass filter, a low-pass filter, and a band-pass filter can be constructed by changing the type of optical film. As the material of the second resin 3, the same material as the first adhesive 6 or the first resin 1 or a material having the same optical characteristics is used, and there is a problem in the transmission characteristics with respect to the wavelength of light to be transmitted. A material having a refractive index close to that of the optical fiber 4 is selected so that light reflection is unlikely to occur. Further, when the expansion coefficient of the material used for the second resin 3 is close to that of the optical film 3 or the optical fiber 4, the temperature characteristics are improved.
【００１５】図２および図３は、本発明の光学フィルタ
を光ファイバ４および光ファイバ４を保持している端末
部材５に第１の接着剤６を用いて接着固定した例を示し
ている。光ファイバ４はあらかじめ第２の接着剤７によ
り端末部材５の中に接着固定されており、端末部材５と
光ファイバ４の先端面は光学的に鏡面研磨されている。
さらに、この端面での光学的反射を防止するために先端
面は光ファイバ４の中心軸に対して垂直な面から８度傾
斜した面で形成されている。本発明の光学フィルタは、
これらの２つの図の様に、どちらの面で接着しても、光
学特性は同じとなる。FIGS. 2 and 3 show an example in which the optical filter of the present invention is bonded and fixed to the optical fiber 4 and the terminal member 5 holding the optical fiber 4 by using the first adhesive 6. The optical fiber 4 is bonded and fixed in advance in the terminal member 5 with the second adhesive 7, and the end surfaces of the terminal member 5 and the optical fiber 4 are optically mirror-polished.
Further, in order to prevent optical reflection at this end face, the tip end face is formed as a face inclined by 8 degrees from a face perpendicular to the central axis of the optical fiber 4. The optical filter of the present invention is
As shown in these two figures, the optical characteristics will be the same regardless of which surface is bonded.
【００１６】[0016]
【発明の効果】以上説明したように、従来の光学フィル
タには方向性があり、逆向きでの接着は所要の光学特性
を満足できなかったのに対して、本発明の光学フィルタ
は表裏の方向のどちらを光ファイバ４に接着しても、同
じ光学特性を得ることができるという効果がある。つま
り、従来のように、光学フィルタの表裏を手間を掛けて
確認せずとも良く、どちらの面で接着しても良いため、
確認の手間が不要である。さらに、従来のように表裏を
誤って接着してしまい、不良品を製造する心配もない効
果がある。As described above, the conventional optical filter has a directivity, and the bonding in the opposite direction cannot satisfy the required optical characteristics, whereas the optical filter of the present invention has a front surface and a back surface. There is an effect that the same optical characteristic can be obtained regardless of which direction is adhered to the optical fiber 4. In other words, unlike the conventional case, it is not necessary to check the front and back of the optical filter with time and effort, and either side may be adhered.
No need for confirmation. Further, there is an effect that the front and back are mistakenly adhered to each other as in the conventional case, and there is no fear of manufacturing a defective product.
【図１】本発明の光学フィルタの一実施例を示す斜視図
である。FIG. 1 is a perspective view showing an embodiment of an optical filter of the present invention.
【図２】本発明の光学フィルタを光ファイバに接着した
ときの一実施例を示す断面図である。FIG. 2 is a cross-sectional view showing an example in which the optical filter of the present invention is bonded to an optical fiber.
【図３】本発明の光学フィルタを光ファイバに接着した
ときの一実施例を示す断面図である。FIG. 3 is a cross-sectional view showing an example in which the optical filter of the present invention is bonded to an optical fiber.
【図４】従来の光学フィルタを光ファイバに正しい方向
で接着した例の断面図である。FIG. 4 is a cross-sectional view of an example in which a conventional optical filter is bonded to an optical fiber in the correct direction.
【図５】従来の光学フィルタを光ファイバに誤った方向
で接着した例の断面図である。FIG. 5 is a cross-sectional view of an example in which a conventional optical filter is bonded to an optical fiber in the wrong direction.
【図６】従来の光学フィルタの断面図である。FIG. 6 is a cross-sectional view of a conventional optical filter.
【図７】従来の光学フィルタの断面図である。FIG. 7 is a cross-sectional view of a conventional optical filter.
１ 第１の樹脂 ２ 光学膜 ３ 第２の樹脂 ４ 光ファイバ ５ 端末部材 ６ 第１の接着剤 ７ 第２の接着剤 ８ 切り欠き ９ ガラス基板 １０ 光学膜 1 1st resin 2 Optical film 3 2nd resin 4 Optical fiber 5 Terminal member 6 1st adhesive agent 7 2nd adhesive agent 8 Notch 9 Glass substrate 10 Optical film
Claims (4)
を特徴とする光学フィルタ。1. An optical filter comprising: a first flat plate, an optical film formed on a surface of the first flat plate, and a second flat plate disposed on an upper surface of the optical film.
は、樹脂により形成されていることを特徴とする請求項
１記載の光学フィルタ。2. The optical filter according to claim 1, wherein the first flat plate and the second flat plate are made of resin.
は、その厚みがそれぞれ１００μｍ以下であることを特
徴とする請求項２きさいの光学フィルタ。3. The optical filter according to claim 2, wherein each of the first flat plate and the second flat plate has a thickness of 100 μm or less.
ることを特徴とする請求項３記載の光学フィルタ。4. The optical filter according to claim 3, wherein the optical filter is a dielectric multilayer film.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP362596A JPH09197112A (en) | 1996-01-12 | 1996-01-12 | Optical filter |
| DE1997100385 DE19700385A1 (en) | 1996-01-12 | 1997-01-08 | Optical filter |
| GB9700535A GB2309098B (en) | 1996-01-12 | 1997-01-13 | Optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP362596A JPH09197112A (en) | 1996-01-12 | 1996-01-12 | Optical filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09197112A true JPH09197112A (en) | 1997-07-31 |
Family
ID=11562686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP362596A Pending JPH09197112A (en) | 1996-01-12 | 1996-01-12 | Optical filter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09197112A (en) |
| DE (1) | DE19700385A1 (en) |
| GB (1) | GB2309098B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63175804A (en) * | 1987-01-16 | 1988-07-20 | Toshiba Corp | Interference film filter and its production |
| JPH04281403A (en) * | 1991-03-08 | 1992-10-07 | Nippon Sheet Glass Co Ltd | High visible heat ray reflecting laminate |
| JPH0530801B2 (en) * | 1984-04-05 | 1993-05-11 | Mitsubishi Petrochemical Co | |
| JPH07104121A (en) * | 1993-10-04 | 1995-04-21 | Kimoto & Co Ltd | Color filter for fluorescent display tube |
| JPH08304623A (en) * | 1995-05-10 | 1996-11-22 | Furukawa Electric Co Ltd:The | Optical thin film |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB810720A (en) * | 1956-11-02 | 1959-03-18 | Erwin Kaesemann | Improvements in or relating to light filters |
| US3499697A (en) * | 1965-01-04 | 1970-03-10 | Monsanto Co | Pellucid laminate with interference filter multilayer and monolayer |
| CS168509B2 (en) * | 1967-12-09 | 1976-06-29 | ||
| US3766061A (en) * | 1971-09-20 | 1973-10-16 | Du Pont | Decorative iridescent compositions |
| JPS60254001A (en) * | 1984-05-14 | 1985-12-14 | Nissha Printing Co Ltd | Color filter |
| JPS62121405A (en) * | 1985-11-22 | 1987-06-02 | Nec Corp | Optical attenuator |
| US5270872A (en) * | 1989-07-20 | 1993-12-14 | The United States Of America As Represented By The Secretary Of The Air Force | Superconducting submicron filter |
| JP3243474B2 (en) * | 1993-12-28 | 2002-01-07 | 光伸光学工業株式会社 | Method for manufacturing multilayer bandpass filter and multilayer bandpass filter having substantially zero wavelength shift temperature coefficient |
-
1996
- 1996-01-12 JP JP362596A patent/JPH09197112A/en active Pending
-
1997
- 1997-01-08 DE DE1997100385 patent/DE19700385A1/en not_active Ceased
- 1997-01-13 GB GB9700535A patent/GB2309098B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530801B2 (en) * | 1984-04-05 | 1993-05-11 | Mitsubishi Petrochemical Co | |
| JPS63175804A (en) * | 1987-01-16 | 1988-07-20 | Toshiba Corp | Interference film filter and its production |
| JPH04281403A (en) * | 1991-03-08 | 1992-10-07 | Nippon Sheet Glass Co Ltd | High visible heat ray reflecting laminate |
| JPH07104121A (en) * | 1993-10-04 | 1995-04-21 | Kimoto & Co Ltd | Color filter for fluorescent display tube |
| JPH08304623A (en) * | 1995-05-10 | 1996-11-22 | Furukawa Electric Co Ltd:The | Optical thin film |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2309098A (en) | 1997-07-16 |
| GB9700535D0 (en) | 1997-03-05 |
| GB2309098B (en) | 1998-04-29 |
| DE19700385A1 (en) | 1997-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980512 |