JPH0570902B2 - - Google Patents
Info
- Publication number
- JPH0570902B2 JPH0570902B2 JP11791986A JP11791986A JPH0570902B2 JP H0570902 B2 JPH0570902 B2 JP H0570902B2 JP 11791986 A JP11791986 A JP 11791986A JP 11791986 A JP11791986 A JP 11791986A JP H0570902 B2 JPH0570902 B2 JP H0570902B2
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- phosphor layer
- particle size
- luminous flux
- protective film
- 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 9
- 230000004907 flux Effects 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- -1 alumina Chemical class 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Luminescent Compositions (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
〔産業上の利用分野〕
この発明は、蛍光ランプの係わり、とくに光束
劣化特性の改善に関するものである。
〔従来の技術〕
従来、蛍光ランプの光束劣化特性改善に関して
さまざまな研究がされてきた。その主なものに例
えば特開昭60−105160号公報に示されているよう
な保護膜による方法がある。保護膜とはガラスバ
ルブ内面上にアルミナ等の金属酸化物被膜を設け
たものであり、これによりガラスバルブと蛍光体
層を分離し、かつ放電空間とも分離したことによ
り、光束劣化の要因となるガラス中のナトリウム
等の蛍光体層への析出や水銀との反応を有効に抑
制するものである。そして、ここで使用されるア
ルミナ等金属酸化物の一つの粒子径は上記特開昭
60−105160号公報にも記載されているように数十
ミリミクロンのものが用いられるのが普通であ
る。
〔発明が解決しようとする問題点〕
しかしながら、上述のようにアルミナ等の金属
酸化物の保護被膜によつて光束劣化特性を改善し
た場合は、さらに改善効果を上げるためには、保
護膜の厚さを増してゆく必要があるが、保護膜の
厚さが厚くなるに従い蛍光体層膜強度が著しく低
下する問題が生じ、それゆえ蛍光体層膜強度の制
約から光束劣化特性改善の効果には限界があつ
た。
この発明は、かかる問題点を解決するためにな
されたものであり、蛍光体層膜強度を低下させる
ことなく、大幅な光束劣化特性改善効果を有し、
表示用光源やコピー用光源等、特に光束劣化が少
ないことが要求される光源として好適な蛍光ラン
プを提供することを目的とする。
〔問題点を解決するための手段〕
この発明にかかわる蛍光ランプは、蛍光体層中
に平均粒径が0.5μ以上のアルミナを蛍光体重量の
5%以上混入するとともに、アルミナの平均粒径
をD(μ)としたとき混入量y(%)はy≦
80log10D+30の範囲内にあることを特徴とする。
〔作用〕
この発明においては、蛍光体層中のアルミナ
は、分散混入されているため、従来保護膜として
使用された量より多量の混入が可能であり、この
混入量増加にともない蛍光体層膜強度および光束
劣化特性を向上させる。
〔実施例〕
第1図はこの発明の一実施例を示す要部断面図
である。すわなちガラスバルブ1内面に従来と同
様なアルミナ保護膜2が設けられおり、その保護
膜2上に蛍光体層が形成されている。この蛍光
体層は蛍光体3と分散混入されたアルミナ4よ
り成つている。
第1図のような構造をもつた蛍光ランプについ
て、蛍光体層中に混入するアルミナ4の平均粒
径と混入量を変化させる実験を行つた。なお、実
験に供した蛍光ランプは次の構成のものであつ
た。すなわち30w形の環状蛍光ランプ(FCL−
30)を用い、蛍光体は三波長域発光形希土類蛍光
体3で行い、保持膜2としては平均粒径20mμの
アルミナを水に分散した0.5%濃度の懸濁液をバ
ルブ1内面に塗布乾燥させて形成したものを用い
た。また結着剤としてホウ酸系結着剤を用いた。
その結果表1に示す値を得た。
[Industrial Field of Application] The present invention relates to fluorescent lamps, and particularly to improvement of luminous flux deterioration characteristics. [Prior Art] Conventionally, various studies have been conducted on improving the luminous flux deterioration characteristics of fluorescent lamps. The main method is a method using a protective film, as disclosed in, for example, Japanese Patent Application Laid-open No. 105160/1983. A protective film is a metal oxide film such as alumina formed on the inner surface of a glass bulb, which separates the glass bulb from the phosphor layer and also separates the discharge space, which can cause deterioration of luminous flux. This effectively suppresses the precipitation of sodium, etc. in the glass into the phosphor layer and the reaction with mercury. The particle size of one of the metal oxides such as alumina used here is
As described in Japanese Patent No. 60-105160, a diameter of several tens of millimeters is usually used. [Problems to be solved by the invention] However, as mentioned above, when the luminous flux deterioration characteristics are improved by a protective film of metal oxide such as alumina, in order to further improve the improvement effect, it is necessary to increase the thickness of the protective film. However, as the thickness of the protective film becomes thicker, the strength of the phosphor layer decreases significantly. Therefore, due to the limitations of the strength of the phosphor layer, the effect of improving luminous flux deterioration characteristics is limited. I've reached my limit. This invention was made to solve such problems, and has the effect of significantly improving luminous flux deterioration characteristics without reducing the strength of the phosphor layer.
It is an object of the present invention to provide a fluorescent lamp suitable for use as a light source, such as a light source for display or a light source for copying, which requires particularly low luminous flux deterioration. [Means for Solving the Problems] The fluorescent lamp according to the present invention includes alumina having an average particle size of 0.5μ or more mixed in the phosphor layer in an amount of 5% or more of the weight of the phosphor, and alumina having an average particle size of 0.5μ or more. When D (μ), the amount of contamination y (%) is y≦
It is characterized by being within the range of 80log 10 D+30. [Function] In this invention, since the alumina in the phosphor layer is dispersed and mixed, it is possible to mix the alumina in a larger amount than that conventionally used as a protective film. Improves intensity and luminous flux degradation characteristics. [Embodiment] FIG. 1 is a sectional view of a main part showing an embodiment of the present invention. That is, an alumina protective film 2 similar to the conventional one is provided on the inner surface of the glass bulb 1, and a phosphor layer is formed on the protective film 2. This phosphor layer consists of phosphor 3 and alumina 4 dispersed therein. For a fluorescent lamp having the structure shown in FIG. 1, an experiment was conducted in which the average particle size and amount of alumina 4 mixed into the phosphor layer were varied. The fluorescent lamp used in the experiment had the following configuration. In other words, a 30w circular fluorescent lamp (FCL-
30), the phosphor is a three-wavelength emitting rare earth phosphor 3, and the holding film 2 is a 0.5% suspension of alumina with an average particle size of 20 mμ dispersed in water, which is applied to the inner surface of the bulb 1 and dried. The material formed by the following methods was used. Further, a boric acid-based binder was used as a binder. As a result, the values shown in Table 1 were obtained.
この発明は、以上説明したとおり、適当な粒径
をもつアルミナを、粒径によつて決定される範囲
内で蛍光体層に混入することにより、蛍光体層膜
強度を低下させることなく蛍光ランプの光束劣化
特性を改善することができる効果がある。
As explained above, this invention enables a fluorescent lamp to be used without reducing the strength of the phosphor layer by mixing alumina having an appropriate particle size into the phosphor layer within the range determined by the particle size. This has the effect of improving the luminous flux deterioration characteristics of.
第1図はこの発明の一実施例を示す要部断面
図、第2図は本発明における有効な範囲を示す図
である。
図中、1はガラスバルブ、3は蛍光体、4はア
ルミナ、は蛍光体層である。
FIG. 1 is a sectional view of a main part of an embodiment of the present invention, and FIG. 2 is a diagram showing an effective range of the present invention. In the figure, 1 is a glass bulb, 3 is a phosphor, 4 is alumina, and phosphor layer.
Claims (1)
を5%以上混入し、かつこの混入されたアルミナ
は平均粒径D(μ)と混入量y(%)がy≦
80log10D+30の関係を満足していることを特徴と
する蛍光ランプ。1. 5% or more of alumina with an average particle size of 0.5 μ or more is mixed into the phosphor layer, and the mixed alumina has an average particle size D (μ) and a mixed amount y (%) of y≦
A fluorescent lamp characterized by satisfying the relationship of 80log 10 D+30.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11791986A JPS62274545A (en) | 1986-05-22 | 1986-05-22 | Fluorescent lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11791986A JPS62274545A (en) | 1986-05-22 | 1986-05-22 | Fluorescent lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62274545A JPS62274545A (en) | 1987-11-28 |
JPH0570902B2 true JPH0570902B2 (en) | 1993-10-06 |
Family
ID=14723424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11791986A Granted JPS62274545A (en) | 1986-05-22 | 1986-05-22 | Fluorescent lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62274545A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2708169B2 (en) * | 1988-02-23 | 1998-02-04 | 株式会社東芝 | Method for producing iron-activated lithium aluminate phosphor and fluorescent lamp |
US5045752A (en) * | 1989-10-24 | 1991-09-03 | General Electric Company | Minimizing mercury condensation in two layer fluorescent lamps |
JP4895309B2 (en) * | 2008-03-05 | 2012-03-14 | ハリソン東芝ライティング株式会社 | Fluorescent lamp |
-
1986
- 1986-05-22 JP JP11791986A patent/JPS62274545A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS62274545A (en) | 1987-11-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |