JP2626144B2 - Reflective UV lamp - Google Patents
Reflective UV lampInfo
- Publication number
- JP2626144B2 JP2626144B2 JP2080300A JP8030090A JP2626144B2 JP 2626144 B2 JP2626144 B2 JP 2626144B2 JP 2080300 A JP2080300 A JP 2080300A JP 8030090 A JP8030090 A JP 8030090A JP 2626144 B2 JP2626144 B2 JP 2626144B2
- Authority
- JP
- Japan
- Prior art keywords
- ultraviolet
- light
- lamp
- film
- reflective
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は紫外線を有効に利用できるようにした反射形
紫外線ランプに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a reflective ultraviolet lamp in which ultraviolet light can be used effectively.
（従来の技術） 従来、両端に１対の電極を封装した管形ガラスバルブ
の内面のうち片側の240゜の角度範囲に酸化チタン粒子
（TiO2）あるいは酸化チタンとマグネシアとの化合物
（マグネシアチタネート）（MgTiO2）からなる紫外線反
射膜を形成し、さらに、この紫外線反射膜の表面に350
〜410nmの近紫外線発光蛍光体被膜を形成した反射形紫
外線ランプが知られている。このランプは放電によって
生成した254nm紫外線で近紫外線発光蛍光体を刺激して3
50〜410nmの近紫外線を放射させ、この近紫外線が反射
膜で反射して投光窓から外界に投射される。(Prior Art) Conventionally, titanium oxide particles (TiO 2 ) or a compound of titanium oxide and magnesia (magnesia titanate) is provided in an angle range of 240 ° on one side of the inner surface of a tubular glass bulb having a pair of electrodes sealed at both ends. ) (MgTiO 2 ) to form an ultraviolet-reflective film, and further, a 350 nm
There is known a reflection type ultraviolet lamp having a near-ultraviolet light-emitting phosphor coating of about 410 nm. This lamp stimulates the near-ultraviolet light-emitting phosphor with 254 nm ultraviolet light generated by the discharge.
Near-ultraviolet rays of 50 to 410 nm are emitted, and the near-ultraviolet rays are reflected by the reflection film and projected from the light-emitting window to the outside.
上記の酸化チタン粒子やマグネシウムチタネート粒子
は300〜400nmの近紫外線を吸収して熱に変える性質があ
り、近紫外線がむだになって効率が低下する欠点があ
る。The above-mentioned titanium oxide particles and magnesium titanate particles have a property of absorbing near-ultraviolet rays of 300 to 400 nm and converting them into heat, and have a disadvantage that near-ultraviolet rays are wasted and the efficiency is reduced.
そこで、本発明者等は種々の材料を検討し試験した結
果、これら酸化チタンやマグネシウムチタネートに代わ
る材料としてアルミナ（Al2O3）の適用を検討してい
る。Therefore, the present inventors have studied and tested various materials, and as a result, have studied the use of alumina (Al 2 O 3 ) as a material in place of titanium oxide and magnesium titanate.
このアルミナが、複写機などに装着されるアパーチャ
形の蛍光ランプの反射膜材料として用いられることは、
たとえば特開昭64−86441号公報や特開昭60−89060号公
報などに記載され知られている。This alumina is used as a reflective film material of an aperture type fluorescent lamp mounted on a copying machine or the like.
For example, it is described and known in JP-A-64-86441 and JP-A-60-89060.
（発明が解決しようとする課題） このように可視光を照射する反射形蛍光ランプの反射
膜にアルミナを用いることは知られているが、アルミナ
の紫外線反射特性がどのようなものか検討されていなか
った。(Problems to be Solved by the Invention) It is known that alumina is used for the reflective film of the reflective fluorescent lamp that irradiates visible light as described above. However, what is the ultraviolet reflection characteristic of alumina is studied. Did not.
本発明は、アルミナ粒子を用いて紫外線反射膜を形成
する場合の、紫外線損失を減らした反射形紫外線ランプ
を提供することである。An object of the present invention is to provide a reflective ultraviolet lamp in which ultraviolet loss is reduced when an ultraviolet reflective film is formed using alumina particles.
（課題を解決するための手段） 本発明の反射形紫外線ランプは、１対の電極が封装さ
れ、少なくとも波長400nm以下の紫外線を透過するガラ
スバルブと、このガラスバルブの内面の一部にアルミナ
粒子を主体として10μｍ以上20μｍ以下の膜厚で形成さ
れた紫外線反射膜とを具備していることを特徴とする。(Means for Solving the Problems) A reflective ultraviolet lamp according to the present invention includes a glass bulb having a pair of electrodes sealed therein and transmitting at least ultraviolet rays having a wavelength of 400 nm or less, and an alumina particle on a part of the inner surface of the glass bulb. And a UV-reflection film formed with a thickness of 10 μm or more and 20 μm or less.
（作用） 反射形紫外線ランプにおいて、酸化チタン粒子やマグ
ネシウムチタネート粒子の代りにアルミナ粒子を塗布し
て反射膜を形成することを考え試験したが、可視光放射
用環状蛍光ランプに設けられていると同じ程度の被膜厚
さが３μｍ以下では、各波長の紫外線のかなりの割合い
が反射膜を透過して背後に放射され、この分は損失とな
ってしまうことが分かった。(Operation) In a reflection type ultraviolet lamp, a test was conducted in consideration of forming a reflection film by applying alumina particles instead of titanium oxide particles and magnesium titanate particles. It has been found that, when the film thickness of the same degree is 3 μm or less, a considerable proportion of the ultraviolet light of each wavelength passes through the reflective film and is radiated behind, which results in a loss.
このようにアルミナ粒子は紫外線の吸収が少ない利点
を有するが、その反面、可視光と各波長紫外線の透過率
が比較的高い欠点がある。そこで、本発明者はアルミナ
粒子を充分に厚く、たとえば10〜20μｍの厚さに塗布し
たところ、紫外線の大部分が反射され、透過が極めて少
なくなることを見出だした。As described above, alumina particles have an advantage of little absorption of ultraviolet rays, but have a disadvantage that the transmittance of visible light and ultraviolet rays of each wavelength is relatively high. The present inventors have found that when the alumina particles are applied to a sufficiently large thickness, for example, in a thickness of 10 to 20 μm, most of the ultraviolet rays are reflected and the transmission is extremely reduced.
本発明は、ガラスバルブの紫外線透過性およびアルミ
ナ粒子を主体として形成した反射膜の膜厚を規制するこ
とによって、紫外線反射特性のよい、高効率化がはかれ
た紫外線放射をするランプを提供するものである。The present invention provides a lamp that emits high-efficiency ultraviolet radiation with good ultraviolet reflection characteristics by regulating the ultraviolet transmittance of a glass bulb and the thickness of a reflective film formed mainly of alumina particles. Things.
（実施例） 以下、本発明の詳細を図示の実施例によって説明す
る。第１図および第２図は本発明を適用してなる近紫外
線用反射形低圧紫外線ランプの一例を示し、図中、
（１）は可視光をカットする青色ガラス管であり、300
〜400nmの光を良く透過する軟質ガラスまたは半硬質ガ
ラスからなる直管形ガラスバルブ、（２）はこのバルブ
（１）内面の一側の240゜の角度範囲に設けられた紫外
線反射膜、（３）はこの紫外線反射膜（２）が設けられ
ていないバルブ（１）内面の残り120゜の角度範囲に形
成された投光窓、（４）は紫外線反射膜（２）表面に形
成された紫外線発光蛍光体被膜である。(Examples) Hereinafter, details of the present invention will be described with reference to the illustrated examples. FIGS. 1 and 2 show an example of a near-ultraviolet reflective low-pressure ultraviolet lamp to which the present invention is applied.
(1) is a blue glass tube that cuts visible light,
A straight glass bulb made of a soft glass or a semi-hard glass that transmits light of up to 400 nm well; (2) an ultraviolet reflecting film provided in an angle range of 240 ° on one side of the inner surface of the bulb (1); 3) is a light projecting window formed in the remaining 120 ° angle range of the inner surface of the bulb (1) where the ultraviolet reflecting film (2) is not provided, and (4) is formed on the surface of the ultraviolet reflecting film (2). An ultraviolet light emitting phosphor coating.
また、（５），（５）はバルブ（１）の両端を閉塞し
たステム、（６），（６）；（６），（６）はこれらス
テム（５），（５）を貫通した２対のリード線、
（７），（７）はこれら２対のリード線（６），
（６）；（６），（６）の対ごとに装架されたフィラメ
ント電極である。そして、バルブ（１）内にはアルゴン
などの始動ガスとともに適量の水銀が封入してある。(5) and (5) are stems with both ends of the valve (1) closed; (6) and (6); (6) and (6) are stems penetrating these stems (5) and (5). Twin lead wires,
(7), (7) are these two pairs of lead wires (6),
(6); Filament electrodes mounted for each pair of (6) and (6). Then, an appropriate amount of mercury is sealed in the valve (1) together with a starting gas such as argon.
上記紫外線反射膜（２）はアルミナ粒子（Al2O3）を
バルブ（１）内面に塗布して焼付けてなるもので、10〜
20μｍの膜厚を有し、250〜350nmの中間波長の紫外線と
350nm以上の波長の近紫外線および可視光を反射する。The ultraviolet reflecting film (2) is formed by applying and baking alumina particles (Al 2 O 3 ) on the inner surface of the bulb (1).
It has a film thickness of 20 μm, and ultraviolet rays with an intermediate wavelength of 250 to 350 nm.
Reflects near-ultraviolet and visible light with a wavelength of 350 nm or more.
上記蛍光体被膜（４）は波長254nmの紫外線に刺激さ
れて350〜410nmの近紫外線を放射するもので、たとえば
BaSiO5/Pb、SrO・SrF2・2B2O3/Eu、（CaZn）３（P
O4）2:Tl、CaO（PO4）2/TlあるいはSr2P2O7/Euなどから
なる蛍光体で形成してある。The phosphor film (4) emits near-ultraviolet light of 350 to 410 nm when stimulated by ultraviolet light having a wavelength of 254 nm.
BaSiO 5 / Pb, SrO · SrF 2 · 2B 2 O 3 / Eu, (CaZn) 3 (P
O 4 ) 2 : Tl, formed of a phosphor such as CaO (PO 4 ) 2 / Tl or Sr 2 P 2 O 7 / Eu.
つぎに、この紫外線ランプの作用を説明する。このラ
ンプを点灯すると、両フィラメント電極（７），（７）
間に放電が生起して波長254nmの紫外線が放射される。
そして、この254nmの紫外線が蛍光体被膜（４）に入射
するとこの蛍光体から350〜410nmの近紫外線が放射され
る。Next, the operation of the ultraviolet lamp will be described. When this lamp is turned on, both filament electrodes (7), (7)
A discharge occurs in between, and ultraviolet rays having a wavelength of 254 nm are emitted.
Then, when this 254 nm ultraviolet ray is incident on the phosphor coating (4), near ultraviolet rays of 350 to 410 nm are emitted from this phosphor.
そして、紫外線反射膜（２）は各波長の紫外線を良く
反射するので、上述の蛍光体被膜（４）から放射された
近紫外線を反射して紫外線を良く透過する投光窓（３）
から外界に放射する。また、蛍光体被膜（４）で吸収し
きれずに透過した254nmの紫外線も、紫外線反射膜
（２）で反射して再度蛍光体被膜（４）に入射し近紫外
線に変換されて投光窓（３）から外界に放射される。な
お、バルブ（１）が軟質ガラスで構成されている場合
は、254nmの紫外線がほとんど投光窓（３）を透過する
ことがない。And since the ultraviolet reflecting film (2) reflects ultraviolet light of each wavelength well, the light projecting window (3) that reflects near ultraviolet light emitted from the above-mentioned phosphor coating (4) and transmits the ultraviolet light well.
Radiates from the outside world. Also, the 254 nm ultraviolet light that has been transmitted without being absorbed by the phosphor coating (4) is reflected by the ultraviolet reflecting film (2), re-enters the phosphor coating (4), is converted into near-ultraviolet light, and is transmitted to the light emitting window ( Radiated from 3) to the outside world. When the bulb (1) is made of soft glass, almost no 254 nm ultraviolet rays pass through the light projecting window (3).
このように、本実施例紫外線ランプにおいては、紫外
線反射膜（２）がアルミナ粒子を10〜20μｍの厚さに被
着して形成されているので、波長254nm以上の各種紫外
線および可視光を良く反射するようになり、しかも紫外
線も可視光もほとんど吸収しないので、紫外線の損失が
ほとんどなく高効率である。また、ガラスバルブは400n
m以下の紫外線をよく透過するので、上記紫外線反射膜
と相俟って紫外線ランプとして特性の向上がはかれる。
さらに、本実施例の紫外線反射膜（２）は赤外線も反射
する利点がある。As described above, in the ultraviolet lamp according to the present embodiment, since the ultraviolet reflecting film (2) is formed by coating the alumina particles with a thickness of 10 to 20 μm, various ultraviolet rays having a wavelength of 254 nm or more and visible light can be effectively removed. Since the light is reflected and hardly absorbs ultraviolet light or visible light, there is little loss of ultraviolet light and high efficiency. The glass bulb is 400n
Since ultraviolet light of m or less is well transmitted, the characteristics of the ultraviolet lamp can be improved in combination with the ultraviolet reflective film.
Further, the ultraviolet reflecting film (2) of this embodiment has an advantage of reflecting infrared rays.
つぎに、他の実施例を第３図に示す。このものは上述
の第１図および第２図に記載した近紫外線用反射形低圧
紫外線ランプにおける投光窓（３）内面にも紫外線発光
蛍光体被膜（４）を形成したもので、その他同一部分に
は同一符号を付してその説明を省略する。この実施例紫
外線ランプは投光窓（３）内面の蛍光体被膜（４）も近
紫外線を発光するので、波長254nmの紫外線のむだがな
く、残らず近紫外線に変換されるので高効率である。Next, another embodiment is shown in FIG. This is a near-ultraviolet reflective low-pressure ultraviolet lamp described in FIG. 1 and FIG. 2 in which an ultraviolet light emitting phosphor coating (4) is also formed on the inner surface of the light emitting window (3). Are denoted by the same reference numerals, and description thereof is omitted. In the ultraviolet lamp of this embodiment, the phosphor coating (4) on the inner surface of the light emitting window (3) also emits near-ultraviolet light. .
さらに他の実施例を第４図に示す。ものものは波長25
4nmの紫外線用反射形低圧紫外線ランプで、（11）は石
英ガラスからなる管形バルブ、（２）は上述の実施例と
同じアルミナ粒子を厚さ10〜20μｍに被着してなる角度
範囲240゜の紫外線反射膜、（３）はこの紫外線反射膜
（２）に対面対向しバルブ（１）内面を露出してなる角
度範囲120゜の投光窓、（７）はバルブ（１）端部に設
けたフィラメント電極で、蛍光膜は設けてない。そし
て、バルブ（１）内にはアルゴンなどの始動ガスととも
に適量の水銀が封入してある。FIG. 4 shows still another embodiment. Things are wavelength 25
A reflection type low-pressure ultraviolet lamp for ultraviolet light of 4 nm, (11) is a tube-shaped bulb made of quartz glass, and (2) is an angle range 240 formed by applying the same alumina particles as in the above-mentioned embodiment to a thickness of 10 to 20 μm. A UV-reflective film of ゜, (3) a light-transmitting window having an angle range of 120 ° which faces the UV-reflective film (2) and exposes the inner surface of the bulb (1), and (7) an end of the bulb (1) The fluorescent electrode is not provided with the fluorescent film. Then, an appropriate amount of mercury is sealed in the valve (1) together with a starting gas such as argon.
この紫外線ランプはフィラメント電極（７）間に放電
させると、波長254nmの紫外線が放射され、この紫外線
が紫外線反射膜（２）に反射されて投光窓（３）から前
方に放射される。When this ultraviolet lamp is discharged between the filament electrodes (7), ultraviolet light having a wavelength of 254 nm is emitted, and this ultraviolet light is reflected by the ultraviolet reflecting film (2) and emitted forward from the light projecting window (3).
この紫外線ランプにおいても、紫外線反射膜（２）が
アルミナ粒子を10〜20μｍの厚さで被着して形成してあ
るので、波長254nmの紫外線の反射率が良く、吸収がほ
とんどないので高効率である。Also in this ultraviolet lamp, since the ultraviolet reflection film (2) is formed by coating alumina particles with a thickness of 10 to 20 μm, the reflectance of ultraviolet light having a wavelength of 254 nm is good, and there is almost no absorption, so high efficiency is achieved. It is.
なお、本発明において紫外線反射膜は前述の例に限ら
ず、たとえばアルミナ粒子にマグネシア（MgO）粒子を
半々に配合したものでもよく、要はアルミナ粒子を主体
とし、これに紫外線吸収率の低い他の金属酸化物を配合
したものでもよい。In the present invention, the ultraviolet reflection film is not limited to the above-mentioned example, and may be, for example, a mixture of alumina particles and magnesia (MgO) particles in halves. May be blended.
また、紫外線反射膜の膜厚は５μｍ以上あれば紫外線
反射率が大きくなるが、好適な範囲は10〜20μｍで紫外
線反射率を高く確保できる。また、紫外線反射膜がアル
ミナ粒子だけで構成されているときは厚さが20μｍに達
すると紫外線反射率が飽和状態に近ずき、それ以上厚く
形成しても材料が無駄になるので意味がない。If the thickness of the ultraviolet reflective film is 5 μm or more, the ultraviolet reflectance increases. However, a preferable range is 10 to 20 μm, and a high ultraviolet reflectance can be secured. Further, when the ultraviolet reflection film is composed only of alumina particles, when the thickness reaches 20 μm, the ultraviolet reflectance approaches a saturated state, and if it is formed thicker, the material becomes useless, so it is meaningless. .
さらに、本発明は蛍光体被膜を設けず波長254nm紫外
線投射を行なういわゆるブラックライト形の反射形紫外
線ランプにおいても適用できる。Further, the present invention can be applied to a so-called black light type reflection type ultraviolet lamp which does not provide a phosphor film and projects ultraviolet light at a wavelength of 254 nm.
さらにまた、本発明は高圧紫外線ランプにも適用でき
るもので、たとえば高圧水銀ランプの外管を硬質ガラス
で構成してその内面の一側に前述のアルミナ粒子を主体
とする紫外線反射膜を形成すれば、波長365nmの近紫外
線ビームを高効率で放射できる。Furthermore, the present invention can be applied to a high-pressure ultraviolet lamp. For example, the outer tube of a high-pressure mercury lamp is made of hard glass, and an ultraviolet reflecting film mainly composed of the above-mentioned alumina particles is formed on one side of the inner surface thereof. For example, a near-ultraviolet beam having a wavelength of 365 nm can be emitted with high efficiency.
以上詳述したように、本発明はガラスバルブの紫外線
透過特性およびアルミナ粒子を主体として形成した反射
膜の膜厚を規制したことにより、バルブでは紫外線透過
が高く、また、反射膜では紫外線反射率が高く紫外線の
損失が少ない、高効率の反射形紫外線ランプを提供する
ことができた。As described in detail above, the present invention regulates the ultraviolet transmission characteristics of the glass bulb and the thickness of the reflection film formed mainly of alumina particles, so that the bulb has high ultraviolet transmission and the reflection film has an ultraviolet reflectance. It is possible to provide a high-efficiency reflection-type ultraviolet lamp with high efficiency and low ultraviolet loss.
第１図は本発明の反射形紫外線ランプの一実施例の縦断
面図、第２図は同じく横断面図、第３図は他の実施例の
横断面図、第４図はさらに他の実施例の横断面図であ
る。 （１），（11）……ガラスバルブ、（２）……紫外線反
射膜 （３）……投光窓、（４）……蛍光体被膜 （５）……ステム、（６）……リード線 （７）……フィラメント1 is a longitudinal sectional view of one embodiment of the reflection type ultraviolet lamp of the present invention, FIG. 2 is a transverse sectional view of the same, FIG. 3 is a transverse sectional view of another embodiment, and FIG. It is a cross-sectional view of an example. (1), (11) ... glass bulb, (2) ... ultraviolet reflective film (3) ... light emitting window, (4) ... phosphor coating (5) ... stem, (6) ... lead Wire (7) ... filament
Claims (1)
0nm以下の紫外線を透過するガラスバルブと； このガラスバルブの内面の一部にアルミナ粒子を主体と
して10μｍ以上20μｍ以下の膜厚で形成された紫外線反
射膜と； を具備していることを特徴とする反射形紫外線ランプ。A pair of electrodes are encapsulated and have a wavelength of at least 40.
A glass bulb that transmits ultraviolet light of 0 nm or less; and an ultraviolet reflective film formed on a part of the inner surface of the glass bulb with alumina particles as a main component and a thickness of 10 μm or more and 20 μm or less. Reflective UV lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080300A JP2626144B2 (en) | 1990-03-28 | 1990-03-28 | Reflective UV lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080300A JP2626144B2 (en) | 1990-03-28 | 1990-03-28 | Reflective UV lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03280345A JPH03280345A (en) | 1991-12-11 |
| JP2626144B2 true JP2626144B2 (en) | 1997-07-02 |
Family
ID=13714422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2080300A Expired - Lifetime JP2626144B2 (en) | 1990-03-28 | 1990-03-28 | Reflective UV lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2626144B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4432315A1 (en) * | 1994-09-12 | 1996-03-14 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Mercury vapor short arc lamp |
| EP0856871A1 (en) * | 1997-01-29 | 1998-08-05 | Nec Corporation | Fluorescent lamp |
| JP3148736B2 (en) * | 1999-04-12 | 2001-03-26 | 株式会社キョウワデバイス | Discharge lamp, method of manufacturing discharge lamp and apparatus using the same |
| JP2008130302A (en) * | 2006-11-20 | 2008-06-05 | Ushio Inc | Light irradiation device |
| JP4900011B2 (en) * | 2006-11-24 | 2012-03-21 | ウシオ電機株式会社 | Discharge lamp |
| JP2009230868A (en) * | 2008-03-19 | 2009-10-08 | Ushio Inc | Excimer lamp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6089060A (en) * | 1983-10-20 | 1985-05-18 | Nec Home Electronics Ltd | Reflection-type fluorescent lamp |
| US4924141A (en) * | 1986-11-12 | 1990-05-08 | Gte Products Corporation | Aluminum oxide reflector layer for fluorescent lamps |
-
1990
- 1990-03-28 JP JP2080300A patent/JP2626144B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03280345A (en) | 1991-12-11 |
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| Date | Code | Title | Description |
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| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970218 |