JP2730259B2 - Fluorescent lamp - Google Patents
Fluorescent lampInfo
- Publication number
- JP2730259B2 JP2730259B2 JP2083858A JP8385890A JP2730259B2 JP 2730259 B2 JP2730259 B2 JP 2730259B2 JP 2083858 A JP2083858 A JP 2083858A JP 8385890 A JP8385890 A JP 8385890A JP 2730259 B2 JP2730259 B2 JP 2730259B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- ultraviolet
- thickness
- phosphor
- ultraviolet absorbing
- 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 - Fee Related
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- Vessels And Coating Films For Discharge Lamps (AREA)
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、けい光体被膜および紫外線吸収被膜を形成
して紫外線の放出を抑止したけい光ランプに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a fluorescent lamp in which emission of ultraviolet rays is suppressed by forming a phosphor coating and an ultraviolet absorbing coating.
（従来の技術） けい光ランプにおいては、紫外線出力を抑えて紫外線
による退色を防止するようにしたランプが知られてい
る。このような紫外線抑止形、つまり退色防止用けい光
ランプは、衣料品、美術品、絵画、印刷物などのような
退色に注意を要するところで使用するのに有効である。(Prior Art) Among fluorescent lamps, there is known a lamp in which the output of ultraviolet rays is suppressed to prevent fading due to ultraviolet rays. Such an ultraviolet-suppressing type, that is, a fluorescent lamp for preventing fading, is effective for use in a place where caution is required for fading, such as clothing, works of art, paintings, and printed matter.
このような紫外線抑止形けい光ランプは、従来、直管
形バルブの内面に酸化チタン（TiO2）からなる紫外線吸
収被膜を形成し、この紫外線吸収被膜の上、つまり放電
空間側表面にけい光体被膜を形成して構成してある。Conventionally, such a UV-suppressing fluorescent lamp has a UV-absorbing coating made of titanium oxide (TiO 2 ) formed on the inner surface of a straight tube bulb, and a fluorescent light is formed on the UV-absorbing coating, that is, on the surface on the discharge space side. It is constructed by forming a body coat.
このような構成のランプでは、点灯中にバルブに封入
された水銀の蒸気が水銀特有の紫外線および可視光の水
銀発光を放出し、この水銀発光はけい光被膜を励起して
可視光を発光させ、したがってバルブの外に可視光が放
出される。In such a lamp, the vapor of mercury enclosed in the bulb emits mercury emission of ultraviolet light and visible light peculiar to mercury during operation, and the mercury emission excites a fluorescent coating to emit visible light. Thus, visible light is emitted outside the bulb.
しかしながら、この場合上記けい光体被膜では水銀か
ら放出される365nm付近の紫外線輝線を効果的に吸収す
ることができず、このためけい光体被膜とバルブ内面と
の間に上記紫外線吸収被膜を形成し、この紫外線吸収被
膜で上記365nm付近の紫外線を吸収し、これにより紫外
線がバルブの外に放出されるのが防止されている。However, in this case, the phosphor coating cannot effectively absorb the ultraviolet emission line near 365 nm emitted from mercury, so that the ultraviolet absorbing coating is formed between the phosphor coating and the inner surface of the bulb. The UV absorbing film absorbs the UV light near 365 nm, thereby preventing the UV light from being emitted outside the bulb.
ところで、このような紫外線吸収被膜およびけい光体
被膜は、以下のようにして形成していた。By the way, such an ultraviolet absorbing film and a phosphor film were formed as follows.
すなわち、綺麗に洗った直管形バルブを搬送ヘッドに
よりバルブ軸が垂直となる姿勢で吊り下げ、このバルブ
を紫外線吸収材塗布位置に送る。この紫外線吸収材塗布
位置では、酸化チタンの微粒子粉末を溶かした懸濁液を
上記垂直に吊り下げられたバルブの上端からこの内面に
流し、バルブの内面全体に塗布する。That is, a cleanly washed straight pipe-shaped valve is suspended by a transport head in a posture in which the valve axis is vertical, and this valve is sent to the ultraviolet absorber applying position. At this UV absorbing material application position, a suspension in which fine particles of titanium oxide are dissolved flows from the upper end of the vertically suspended bulb to the inner surface thereof, and is applied to the entire inner surface of the bulb.
この塗布液を乾燥させ、搬送ヘッドの移動に伴いこの
バルブを加熱炉に通過させる。この加熱炉で塗布液を焼
き上げて紫外線吸収被膜が形成される。The coating liquid is dried, and the valve is passed through a heating furnace as the transport head moves. The coating solution is baked in this heating furnace to form an ultraviolet absorbing film.
次に、上記バルブを垂直に吊り下げたまま搬送ヘッド
の移動によりこのバルブをけい光体塗布位置に送る。こ
のけい光体塗布位置では、３波長域発光けい光体の懸濁
液を上記垂直に吊り下げられたバルブの上端からこの内
面に流し、上記紫外線吸収被膜の内面全体に重ねて塗布
する。Next, the valve is sent to the phosphor application position by moving the transport head while the valve is suspended vertically. In this phosphor application position, the suspension of the three-wavelength-band phosphor is allowed to flow from the upper end of the vertically suspended bulb to the inner surface, and is applied over the entire inner surface of the ultraviolet absorbing film.
このけい光体液を乾燥させ、搬送ヘッドの移動に伴い
このバルブを加熱炉に通過させる。この加熱炉でけい光
体を焼き上げてけい光体被膜が形成される。The phosphor fluid is dried, and the valve is passed through a heating furnace as the transport head moves. The phosphor is baked in this heating furnace to form a phosphor coating.
（発明が解決しようとする課題） しかしながら、上記のような紫外線吸収被膜およびけ
い光体被膜は、これらの溶液を塗布する場合、バルブを
垂直な姿勢に保持して溶液をバルブの上端から内面に流
して塗布する（フロー式）ものであるから、垂直姿勢の
上端側では塗布膜厚が薄くなり、また下端側では膜厚が
厚くなる。(Problems to be Solved by the Invention) However, when applying such a solution, the ultraviolet absorbing film and the phosphor film as described above hold the valve in a vertical position and move the solution from the upper end of the valve to the inner surface. Since the coating is performed by flowing (flow type), the coating thickness becomes thinner at the upper end of the vertical posture, and becomes thicker at the lower end.
しかも、紫外線吸収被膜を形成する場合の垂直姿勢と
けい光体被膜を形成する場合の垂直姿勢は、両工程とも
同一端部が搬送ヘッドに支持されているので、紫外線吸
収被膜の膜厚が薄い領域にけい光体被膜の膜厚の薄い領
域が形成されるとともに、紫外線吸収被膜の膜厚が厚い
領域にけい光体被膜の膜厚の厚い領域が形成されるもの
であった。In addition, the vertical position when forming the ultraviolet absorbing film and the vertical position when forming the phosphor film are the same in both processes because the same end is supported by the transport head. A region where the thickness of the phosphor film is thin is formed, and a region where the thickness of the phosphor film is thick is formed in a region where the ultraviolet absorbing film is thick.
このような構造の場合は、第３図に示す特性図から明
らかなように、紫外線吸収被膜およびけい光体被膜の膜
厚が薄い端部側では紫外線を十分に吸収できず、365nm
の紫外線が放出される不具合がある。In the case of such a structure, as is clear from the characteristic diagram shown in FIG. 3, the ultraviolet absorbing film and the phosphor film cannot absorb ultraviolet light sufficiently at the thin end side and have a thickness of 365 nm.
UV light is emitted.
これはけい光体被膜の膜厚の薄い領域では紫外線が良
好に可視光に変換されず、あるいは吸収されずに透過し
てしまう傾向にあり、加えてこのように透過した紫外線
は膜厚の薄い紫外線吸収被膜を透過しようとし、この膜
厚の薄い紫外線吸収被膜では紫外線吸収能力が低いので
紫外線を吸収し切れず、この領域から紫外線が放出され
るものである。This is because ultraviolet light is not converted into visible light in a region where the thickness of the phosphor film is thin, or tends to be transmitted without being absorbed, and in addition, the ultraviolet light thus transmitted is thin. The ultraviolet absorbing film having a small thickness tends to transmit through the ultraviolet absorbing film. The ultraviolet absorbing film having a small thickness cannot absorb the ultraviolet light completely and emits the ultraviolet light from this region.
なお、第３図では紫外線吸収被膜を、紫外線吸収剤付
着総量が0.3gの場合（特性Ｃの実線で示す）と、紫外線
吸収剤付着総量が0.1gの場合（特性Ｄの破線で示す）の
両者を実験した結果を表示してある。第３図から明らか
なとおり、両者とも紫外線吸収被膜およびけい光体被膜
の膜厚が薄い端部側では365nmの紫外線の放出が認めら
れた。In FIG. 3, the UV-absorbing film is divided into a case where the total amount of the UV absorbent adhering is 0.3 g (shown by the solid line of the characteristic C) and a case where the total amount of the UV absorbent adhering is 0.1 g (shown by a broken line of the characteristic D). The results of both experiments are displayed. As is clear from FIG. 3, in both cases, emission of ultraviolet light of 365 nm was recognized at the end portions where the thickness of the ultraviolet absorbing film and the phosphor film was thin.
このようなことから、紫外線吸収被膜の膜厚を全体に
亘り略均一にする試みがなされている。For this reason, attempts have been made to make the thickness of the ultraviolet absorbing film substantially uniform over the whole.
すなわち、紫外線吸収被膜を形成する場合、まず直管
形バルブを搬送ヘッドにより垂直な姿勢で吊り下げ、こ
のバルブの内面に紫外線吸収材の懸濁液をバルブの上端
から流して塗布し、これを乾燥する。That is, when forming an ultraviolet absorbing film, first, a straight pipe-shaped valve is suspended in a vertical position by a transfer head, and a suspension of an ultraviolet absorbing material is applied to the inner surface of the valve by flowing the suspension from the upper end of the valve. dry.
次にバルブを搬送ヘッドから一度外して上下を反転し
て再び搬送ヘッドに垂直な姿勢で吊り下げる。この状態
でバルブの内面に紫外線吸収材の懸濁液をバルブの上端
から流して塗布し、これを乾燥する。Next, the valve is once removed from the transport head, turned upside down, and suspended again in a posture perpendicular to the transport head. In this state, the suspension of the ultraviolet absorber is applied to the inner surface of the bulb by flowing it from the upper end of the bulb, and is dried.
このようにしてバルブの内面に形成した紫外線吸収材
の被膜を、加熱炉で焼成することにより紫外線吸収被膜
を形成する。The coating of the ultraviolet absorbing material formed on the inner surface of the bulb in this manner is fired in a heating furnace to form an ultraviolet absorbing coating.
このように形成した紫外線吸収被膜の表面に、前記し
た従来と同様にしてけい光体被膜を形成する。On the surface of the ultraviolet absorbing film thus formed, a phosphor film is formed in the same manner as in the above-mentioned conventional case.
このようにした場合は、紫外線吸収被膜が上下反転に
よる２度塗りにより全面に亘り略均等な膜厚で形成され
ているので、けい光体被膜に膜厚のばらつきがあっても
紫外線の吸収性能が良くなる。In this case, since the ultraviolet absorbing film is formed with a substantially uniform film thickness over the entire surface by coating twice by upside-down, even if the phosphor film has a variation in film thickness, the ultraviolet absorbing performance can be improved. Will be better.
すなわち、このような２度塗りの場合は、第３図にお
いて特性Ｂで示すように、365nmの紫外線の放出は殆ど
認められない。これは紫外線吸収被膜の膜厚が十分厚
く、しかもバルブ全面に亘り略均等な膜厚で形成されて
いるので、紫外線を十分に吸収するためである。That is, in the case of such a double coating, as shown by the characteristic B in FIG. 3, emission of 365 nm ultraviolet rays is hardly recognized. This is because the ultraviolet absorbing film is sufficiently thick and has a substantially uniform film thickness over the entire surface of the bulb, so that the ultraviolet absorbing film is sufficiently absorbed.
しかしながら、上記のように紫外線吸収被膜をバルブ
の全体に亘り均等に形成した場合は、この上に形成され
るけい光体被膜が場所により膜厚差をもっているので、
上記のように紫外線遮断性能は良好となっても、逆に可
視光の放射性能が低下する不具合がある。However, when the ultraviolet absorbing film is formed uniformly over the entire bulb as described above, since the phosphor film formed thereon has a film thickness difference depending on the location,
As described above, even if the ultraviolet blocking performance is improved, there is a problem that the radiation performance of visible light is reduced.
すなわち、紫外線吸収被膜を構成する酸化チタン（Ti
O2）は、紫外線吸収機能に優れているが可視光も若干吸
収する性質があり、このため明るさが低下する傾向があ
る。That is, titanium oxide (Ti
O 2 ) has an excellent ultraviolet absorbing function, but also has a property of slightly absorbing visible light, so that the brightness tends to decrease.
そして、けい光体被膜も膜厚により紫外線吸収性に差
がある。The phosphor coating also has a difference in ultraviolet absorption depending on the film thickness.
このため場所により膜厚差をもっているけい光体被膜
は、膜厚の大きい領域で紫外線の透過が少ないので、こ
こに紫外線吸収被膜を厚く形成する必要はなく、むしろ
紫外線吸収被膜を厚く形成すると明るさを低下させる不
具合が生じる。For this reason, since the phosphor film having a thickness difference depending on the place has a small transmittance of ultraviolet rays in a region where the film thickness is large, it is not necessary to form a thick ultraviolet absorbing film here. There is a problem that the height is reduced.
また、一方、上記のように紫外線吸収被膜を、上下反
転による２度塗りにより形成する場合は、作業工程が増
加し、被膜を形成するに要する時間が長くなる。On the other hand, when the ultraviolet absorbing film is formed by two-time application by upside down as described above, the number of working steps increases, and the time required to form the film increases.
本発明においては、明るさを低下させずに紫外線を良
好に抑制し、しかも製造が容易なけい光ランプを提供し
ようとするものである。In the present invention, it is an object of the present invention to provide a fluorescent lamp which can favorably suppress ultraviolet rays without lowering brightness and which is easy to manufacture.
［発明の構成］ （課題を解決するための手段） 請求項１の発明は、放電媒体が封入されるとともに電
極が封装され、内面にけい光体被膜が形成されたガラス
バルブと、けい光体被膜の膜厚が大きい箇所には小さい
膜厚で、けい光被膜の膜厚が小さい箇所には大きい膜厚
でそれぞれガラスバルブに被覆された透明な酸化チタン
被膜とを具備したことを特徴とする。[Constitution of the Invention] (Means for Solving the Problems) The invention according to claim 1 is a glass bulb in which a discharge medium is sealed, electrodes are sealed, and a phosphor film is formed on the inner surface, and a phosphor is provided. A transparent titanium oxide film coated on a glass bulb with a small film thickness in a portion where the film thickness is large and a large film thickness in a portion where the film thickness of the fluorescent film is small is characterized by being provided. .
請求項２の発明は、請求項１の酸化チタン被膜はガラ
スバルブの外面に被覆されていることを特徴とする。The invention of claim 2 is characterized in that the titanium oxide film of claim 1 is coated on the outer surface of a glass bulb.
請求項３の発明は、請求項１または請求項２の酸化チ
タン被膜は、酸化亜鉛を混合して構成されていることを
特徴とする。The invention of claim 3 is characterized in that the titanium oxide film of claim 1 or 2 is formed by mixing zinc oxide.
（作用） 請求項１の発明によれば、けい光体被膜の膜厚が厚い
箇所では紫外線吸収被膜の膜厚を薄くし、かつけい光体
被膜の膜厚が薄い箇所では紫外線吸収被膜の膜厚を薄く
することができるので、明るさ低下させることなく紫外
線を有効に遮断することができる。(Function) According to the invention of claim 1, the thickness of the ultraviolet absorbing film is reduced in the portion where the thickness of the phosphor film is large, and the thickness of the ultraviolet absorbing film is reduced in the portion where the thickness of the phosphor film is small. Since the thickness can be reduced, ultraviolet rays can be effectively blocked without lowering the brightness.
請求項２の発明によれば、バルブ外面に酸化チタン膜
を被覆するようにしたので、酸化チタン膜紫外線吸収の
作用が有効に行われる。According to the second aspect of the present invention, since the titanium oxide film is coated on the outer surface of the bulb, the effect of ultraviolet absorption of the titanium oxide film is effectively performed.
請求項３の発明によれば、バルブ外面に被覆された酸
化チタン膜は、酸化亜鉛を混合しているので、酸化亜鉛
により明るさを低下させることなく、紫外線を有効に遮
断することができる。According to the third aspect of the present invention, since the titanium oxide film coated on the outer surface of the bulb contains zinc oxide, the ultraviolet rays can be effectively blocked without lowering the brightness by the zinc oxide.
（実施例） 以下本発明について、第１図および第２図に示す一実
施例にもとづき説明する。(Example) Hereinafter, the present invention will be described based on an example shown in FIGS. 1 and 2. FIG.
第１図は、型式FL20SS・EX−N/18と表示される３波長
域発光形けい光体ランプを示し、１は直管形のガラスバ
ルブである。このバルブ１は例えば管径が28mm、管長58
0mm程度の大きさをなし、内部に放電空間２を形成して
ある。FIG. 1 shows a three-wavelength-band fluorescent lamp indicated as model FL20SS.EX-N / 18, wherein 1 is a straight tube glass bulb. The valve 1 has a pipe diameter of 28 mm and a pipe length of 58, for example.
It has a size of about 0 mm and has a discharge space 2 formed therein.
バルブ１の両端部はステム３、３で封止されており、
これらステム３、３にはフィラメント電極４、４が取付
けられている。Both ends of the valve 1 are sealed with stems 3 and 3,
Filament electrodes 4, 4 are attached to these stems 3, 3.
バルブ１の端部には口金５、５が被着されており、こ
れら口金５、５にはそれぞれ上記電極４、４に接続され
た口金ピン６…が突設されている。Bases 5, 5 are attached to the end of the bulb 1, and base pins 6, connected to the electrodes 4, 4, respectively, protrude from the bases 5, 5.
バルブ１の内面には全面に亘りけい光体被膜７が形成
されている。このけい光体被膜７は３波長域発光けい光
体を主成分とするもので、例えば450nm付近に発光ピー
ク波長を有する３（Ba,Mg）0.8Al2O3:Euなどのような青
色発光けい光体と、540nm付近に発光ピーク波長を有す
るLaPO4:Ce、Tbなどの緑色発光けい光体および、610nm
付近に発光ピーク波長を有するY2O3:Euなどのような赤
色発光けい光体の３種を混合して形成されている。A phosphor coating 7 is formed on the entire inner surface of the bulb 1. The phosphors coating 7 as a main component three band emission fluorescent body, for example 3 having an emission peak wavelength 450nm around (Ba, Mg) 0.8Al 2 O 3: blue emission, such as Eu a fluorescent body, LaPO having an emission peak wavelength in the vicinity 540nm 4: Ce, green-emitting phosphor such as Tb and, 610 nm
It is formed by mixing three kinds of red light-emitting phosphors such as Y 2 O 3 : Eu having an emission peak wavelength in the vicinity.
なお、このバルブ１内には所定量の水銀とアルゴンガ
スなどの不活性ガスが封入されている。A predetermined amount of mercury and an inert gas such as argon gas are sealed in the valve 1.
上記バルブ１の外面には全面に亘り紫外線吸収被膜８
が形成されている。The entire surface of the bulb 1 is covered with an ultraviolet absorbing coating 8.
Are formed.
この紫外線吸収被膜８は、酸化チタン（TiO2）と酸化
亜鉛（ZnO）の粉末を混合して形成されている。The ultraviolet absorbing film 8 is formed by mixing powders of titanium oxide (TiO 2 ) and zinc oxide (ZnO).
なお、酸化チタン（TiO2）は粒径0.03〜0.05μｍ、酸
化亜鉛（ZnO）は粒径0.0015〜0.005μｍ程度の微粒子に
より形成され、これらの粉末は無機懸濁液に混入されて
バルブ１の外面に塗布され、これを焼成して作ることが
できる。Note that titanium oxide (TiO 2 ) is formed of fine particles having a particle size of 0.03 to 0.05 μm, and zinc oxide (ZnO) is formed of fine particles having a particle size of approximately 0.0015 to 0.005 μm. It is applied to the outer surface and can be made by firing.
ところで、バルブ１の内面に形成されたけい光体被膜
７は、従来と同様にバルブ軸を垂直方向の姿勢に保持し
て、上端からけい光体溶液をフロー塗布することにより
形成され、このためけい光体被膜７の膜厚は一端側が厚
く、他端側が薄く形成される。By the way, the phosphor film 7 formed on the inner surface of the bulb 1 is formed by applying the phosphor solution from the upper end by flow coating while keeping the valve axis in the vertical direction as in the conventional case. The thickness of the phosphor coating 7 is formed thick at one end and thin at the other end.
すなわち図面において、けい光体被膜７は図示上側の
膜厚tp1が図示下側の膜厚tp2より厚くなっている（tp1
＞tp2）。That is, in the drawing, the phosphor film 7 has a film thickness tp1 on the upper side in the figure larger than a film thickness tp2 on the lower side in the figure ( tp1).
> T p2 ).
これに対し、バルブ１の外面に形成された紫外線吸収
被膜８は、バルブ１の封止終了後、つまり口金付けの工
程前に形成することができ、バルブ軸を上記けい光体被
膜７を作る時と上下反対にした垂直姿勢に保持して、上
端から紫外線吸収材溶液をフロー塗布することにより形
成することができる。On the other hand, the ultraviolet absorbing coating 8 formed on the outer surface of the bulb 1 can be formed after the sealing of the bulb 1 is completed, that is, before the capping step, and the above-mentioned phosphor coating 7 is formed on the bulb shaft. It can be formed by applying the ultraviolet absorber solution by flow coating from the upper end while maintaining the vertical position upside down.
このようにして形成された紫外線吸収被膜８の膜厚は
一端側が薄く、他端側が厚く形成される。The thickness of the ultraviolet absorbing film 8 thus formed is thin at one end and thick at the other end.
すなわち図面において、紫外線吸収被膜８は図示上側
の膜厚tU1が図示下側の膜厚tU2より薄くなっている（t
U1＜tU2）。That is, in the drawing, the thickness t U1 of the ultraviolet absorbing film 8 on the upper side in the drawing is smaller than the thickness t U2 on the lower side in the drawing (t
U1 < tU2 ).
このようなことから、バルブ１の内面に形成されたけ
い光体被膜７の膜厚tp1の大きい箇所にはバルブ１の外
面に形成された紫外線吸収被膜８の膜厚tU1の薄い領域
が対向され、かつけい光体被膜７の膜厚tp2の小さい領
域には紫外線吸収被膜８の膜厚tU2の厚い箇所が対向さ
れている。For this reason, a region where the thickness t U1 of the ultraviolet absorbing coating 8 formed on the outer surface of the bulb 1 is thinner at a place where the thickness t p1 of the phosphor coating 7 formed on the inner surface of the bulb 1 is large. A portion of the ultraviolet light absorbing film 8 having a large thickness t U2 is opposed to a region where the film thickness t p2 of the covering film 7 is small.
つまり、けい光体被膜７の膜厚と紫外線吸収被膜８の
膜厚の和は、バルブ全体に亘り略等しくなるように形成
されている。That is, the sum of the thickness of the phosphor coating 7 and the thickness of the ultraviolet absorbing coating 8 is formed to be substantially equal over the entire bulb.
このような実施例の構成によると、ランプが点灯中に
は放電により水銀蒸気が水銀特有の紫外線および可視光
の水銀発光を放出し、この水銀発光はけい光体被膜７を
励起して可視光を発光させてバルブ１を透過する。According to the configuration of such an embodiment, when the lamp is turned on, the mercury vapor emits mercury emission of ultraviolet light and visible light peculiar to mercury by discharge, and the mercury emission excites the phosphor film 7 to emit visible light. And emit light through the bulb 1.
この場合、放電空間２で水銀蒸気から放射された365n
m付近の紫外線はけい光体被膜７を透過しようとする。In this case, 365n emitted from mercury vapor in the discharge space 2
Ultraviolet rays in the vicinity of m tend to pass through the phosphor coating 7.
この場合の紫外線の透過具合は、けい光体被膜７の膜
厚が大きい箇所tp1では紫外線透過量は少なく、けい光
体被膜７の膜厚の小さい領域tp2では紫外線透過量が多
くなる傾向を示す。In this case, the degree of transmission of ultraviolet light is such that the amount of ultraviolet transmission tends to be small at a portion tp1 where the thickness of the phosphor film 7 is large, and increased at a region tp2 where the film thickness of the phosphor film 7 is small. Is shown.
このようにして、けい光体被膜７およびバルブ１を透
過した365nm付近の紫外線は、バルブ１の外面に形成さ
れた紫外線吸収被膜８により吸収される。In this manner, the ultraviolet rays near 365 nm transmitted through the phosphor coating 7 and the bulb 1 are absorbed by the ultraviolet absorbing coating 8 formed on the outer surface of the bulb 1.
この場合、紫外線吸収被膜８の紫外線吸収能力は、紫
外線吸収被膜８の膜厚が薄い箇所tU1では紫外線吸収力
が小さく、逆に紫外線吸収被膜８の膜厚が厚い箇所tU2
では紫外線吸収力が大きい。In this case, the ultraviolet absorbing ability of the ultraviolet absorbing film 8 is such that the ultraviolet absorbing power is small at the portion t U1 where the thickness of the ultraviolet absorbing film 8 is thin, and conversely, the portion t U2 where the film thickness of the ultraviolet absorbing film 8 is thick.
The UV absorption is large.
しかし、上記けい光体被膜７を透過する時、けい光体
被膜７の膜厚の小さい領域tp2を透過した紫外線の透過
量は多いが、この紫外線は外側の紫外線吸収被膜８の膜
厚の厚い箇所tU2に達し、この膜厚の厚い紫外線吸収被
膜８は紫外線吸収能力が大きいので紫外線を良く吸収
し、外に出るのを阻止する。However, when transmitted through the phosphor film 7, the amount of ultraviolet light transmitted through the region tp2 where the film thickness of the phosphor film 7 is small is large. The thick ultraviolet absorbing film 8 reaches the thick portion t U2 and has a large ultraviolet absorbing ability, so that it absorbs ultraviolet light well and prevents it from going outside.
また、けい光体被膜７の膜厚の厚い領域tp1を透過し
た紫外線は透過量が少なく、この紫外線は外側の紫外線
吸収被膜８の膜厚の薄い箇所tU1に達しこの膜厚の薄い
紫外線吸収被膜８の紫外線吸収能力が低くても、もとも
と紫外線が少ないので紫外線を外に透過させることはな
い。The ultraviolet light transmitted through the thick region tp1 of the phosphor film 7 has a small amount of transmission, and reaches the thin portion tU1 of the outer ultraviolet absorbing film 8 where the ultraviolet light has a small thickness. Even if the ultraviolet absorbing ability of the absorbing film 8 is low, the ultraviolet ray does not transmit outside because the ultraviolet ray is originally small.
したがって、バルブの全体に亘り紫外線を良好にカッ
トすることになる。Therefore, the ultraviolet rays are favorably cut over the entire bulb.
本実施例の場合の紫外線出力は第２図で特性Ａとして
示すようになり、第３図に示す従来の紫外線吸収溶液を
２度塗りした場合（特性Ｂ）と同程度の紫外線防止能力
を有し、第３図の特性ＣおよびＤで示す場合に比べて紫
外線吸収性能のばらつきが解消される。The UV output in the case of this embodiment is shown as a characteristic A in FIG. 2, and has the same UV protection capability as that obtained when the conventional UV absorbing solution shown in FIG. 3 is applied twice (character B). However, as compared with the case indicated by the characteristics C and D in FIG.
そして、けい光体被膜７の膜厚の大きい領域tp1に対
しては紫外線吸収被膜８の膜厚を薄くtU1としたので、
紫外線吸収被膜８で可視光を吸収する割合が少なくな
り、明るさを向上させることができる。Since the thickness of the ultraviolet absorbing film 8 is set to be thin at t U1 for the region tp1 where the thickness of the phosphor film 7 is large,
The ratio of absorption of visible light by the ultraviolet absorbing film 8 is reduced, and the brightness can be improved.
しかも、上記実施例の場合は、従来の紫外線吸収溶液
を２度塗りするなどの面倒な作業は不要であり、上記２
度塗りの場合に比べて作業能率が向上し、製造時間が短
縮される。In addition, in the case of the above-described embodiment, a troublesome operation such as applying the conventional ultraviolet absorbing solution twice is not necessary.
The work efficiency is improved and the manufacturing time is shortened as compared with the case of the first coating.
特に本実施例の場合は、紫外線吸収被膜８をバルブ１
の外面に形成したので、この紫外線吸収被膜８はランプ
製造工程のどの工程に加えても製造することができる。
例えばバルブ封止工程の後などでも製造が可能であるか
ら、従来の製造ラインを大幅に変更する必要がなく、コ
スト高を防止することも可能である。Particularly in the case of this embodiment, the ultraviolet absorbing film 8 is
The ultraviolet absorbing film 8 can be manufactured in any lamp manufacturing process.
For example, since the production can be performed even after the valve sealing step, it is not necessary to largely change the conventional production line, and it is possible to prevent an increase in cost.
ところで、本実施例の紫外線吸収被膜８は、酸化チタ
ン（TiO2）と酸化亜鉛（ZnO）の粉末を混合して形成し
たので、さらに明るさが向上する利点がある。By the way, since the ultraviolet absorbing film 8 of this embodiment is formed by mixing titanium oxide (TiO 2 ) and zinc oxide (ZnO) powder, there is an advantage that the brightness is further improved.
すなわち、従来の紫外線吸収被膜は、酸化チタン（Ti
O2）粉末で形成されていたが、酸化チタンは紫外線吸収
性能に優れているが、可視光も若干吸収する作用があ
り、したがって明るさが若干劣る問題があった。That is, the conventional ultraviolet absorbing film is made of titanium oxide (Ti
Although it was formed of O 2 ) powder, titanium oxide is excellent in ultraviolet absorption performance, but has a function of slightly absorbing visible light, and thus has a problem that brightness is slightly inferior.
これに対し、本実施例においては、酸化チタン（Ti
O2）と酸化亜鉛（ZnO）を混合して紫外線吸収被膜を形
成した。酸化亜鉛は可視光を透過する性質に優れてお
り、従来の酸化チタンの一部と入れ替わることにより、
従来よりも可視光の透過率が向上し、よって明るさが増
す利点がある。In contrast, in the present embodiment, titanium oxide (Ti
O 2 ) and zinc oxide (ZnO) were mixed to form an ultraviolet absorbing film. Zinc oxide has an excellent property of transmitting visible light, and by replacing some of the conventional titanium oxide,
There is an advantage that the transmittance of visible light is improved as compared with the related art, and thus the brightness is increased.
但し、酸化亜鉛は酸化チタンに比べて紫外線吸収性能
の点で若干劣るので、酸化チタンと酸化亜鉛を混合して
紫外線吸収被膜を形成した場合、紫外線吸収被膜の膜厚
を大きくすると紫外線吸収性能が低下する。However, zinc oxide is slightly inferior to titanium oxide in terms of ultraviolet absorption performance. Therefore, when titanium oxide and zinc oxide are mixed to form an ultraviolet absorption coating, the ultraviolet absorption performance is increased by increasing the thickness of the ultraviolet absorption coating. descend.
このため、上述したように、けい光体被膜７に本来備
えている紫外線吸収性能を利用し、けい光体被膜７の膜
厚の大きい部分で出来る限り紫外線を吸収させ、これに
対して明るさを向上させるために混合した酸化亜鉛を含
む紫外線吸収被膜８を極力薄くすることで可視光の透過
性を向上させることができる。For this reason, as described above, the ultraviolet absorption performance inherent in the phosphor coating 7 is used to absorb the ultraviolet rays as much as possible in the portion where the thickness of the phosphor coating 7 is large, and the brightness The visible light transmittance can be improved by making the ultraviolet absorbing film 8 containing zinc oxide mixed as thin as possible in order to improve the transmittance.
なお、酸化亜鉛の粒径は0.0015〜0.005μｍ程度であ
り、酸化チタン（TiO2）の粒径0.03〜0.05μｍに比べて
極めて小さいので、このような酸化亜鉛を混入すれば紫
外線吸収被膜８の膜強度が向上する。このことから、紫
外線吸収被膜８をバルブ１の外面に形成してもこの被膜
８が剥がれ難くなり、実用上支障のない強度を保つこと
ができる。The particle size of zinc oxide is about 0.0015 to 0.005 μm, which is extremely smaller than the particle size of titanium oxide (TiO 2 ) of 0.03 to 0.05 μm. The film strength is improved. For this reason, even if the ultraviolet absorbing film 8 is formed on the outer surface of the bulb 1, the film 8 is hardly peeled off, and the strength which does not hinder practical use can be maintained.
なお、本発明は上記実施例に制約されるものではな
い。The present invention is not limited to the above embodiment.
すなわち、上記実施例では紫外線吸収被膜を酸化チタ
ン（TiO2）と酸化亜鉛（ZnO）を混合して形成したが、
本発明はこれに限らず、紫外線吸収被膜は従来と同様に
酸化チタン（TiO2）のみで形成してもよい。That is, in the above embodiment, the ultraviolet absorbing film is formed by mixing titanium oxide (TiO 2 ) and zinc oxide (ZnO).
The present invention is not limited to this, and the ultraviolet absorbing film may be formed only of titanium oxide (TiO 2 ) as in the related art.
また、上記実施例では紫外線吸収被膜８をバルブ１の
外面に形成した場合を説明したが、本発明は紫外線吸収
被膜をバルブの内面に形成してもよい。この場合、紫外
線吸収被膜は水銀から放出される紫外線がけい光体被膜
を透過して可視光に変換されない場合のその紫外線を遮
断するものであるから、バルブとけい光体被膜の間に形
成される。Further, in the above embodiment, the case where the ultraviolet absorbing film 8 is formed on the outer surface of the bulb 1 has been described. However, the present invention may form the ultraviolet absorbing film on the inner surface of the bulb. In this case, the ultraviolet absorbing film is formed between the bulb and the fluorescent film because the ultraviolet light emitted from the mercury blocks the ultraviolet light when the ultraviolet light transmitted through the fluorescent material film is not converted into visible light. .
そして、この場合、従来の２度塗りの場合に比べて塗
布回数が少なくてすみ、作業能率が向上する。In this case, the number of times of application is smaller than in the case of the conventional two-time coating, and the work efficiency is improved.
さらに、本発明は直管形けい光ランプに制約されず、
屈曲形けい光ランプであってもよい。Furthermore, the invention is not restricted to straight tube fluorescent lamps,
It may be a bent fluorescent lamp.
［発明の効果］ 以上の説明のように請求項１記載の発明によれば、け
い光体被膜の膜厚が厚い箇所では紫外線吸収被膜の膜厚
を薄くし、かつけい光体被膜の膜厚が薄い箇所では紫外
線吸収被膜の膜厚を薄くすることができるので、明るさ
低下させることなく紫外線を有効に遮断することができ
る。[Effects of the Invention] As described above, according to the first aspect of the present invention, the thickness of the ultraviolet absorbing film is reduced in the portion where the thickness of the phosphor film is large, and the thickness of the phosphor film is reduced. Where the thickness is small, the thickness of the ultraviolet absorbing film can be reduced, so that ultraviolet rays can be effectively blocked without lowering the brightness.
また、請求項２記載の発明によれば、バルブ外面に酸
化チタン膜を被覆するようにしたので、酸化チタン膜の
紫外線吸収の作用が有効に行われる。According to the second aspect of the present invention, since the titanium oxide film is coated on the outer surface of the bulb, the function of absorbing ultraviolet light of the titanium oxide film is effectively performed.
さらに、請求項３記載の発明によれば、バルブ外面に
被覆された酸化チタン膜は、酸化亜鉛を混合しているの
で、酸化亜鉛により明るさを低下させることなく、紫外
線を有効に遮断することができる。Further, according to the third aspect of the present invention, since the titanium oxide film coated on the outer surface of the bulb contains zinc oxide, it is possible to effectively block ultraviolet rays without lowering the brightness by the zinc oxide. Can be.
【図面の簡単な説明】 第１図および第２図は本発明の一実施例を示し、第１図
はけい光ランプの断面図、第２図は紫外線出力の特性
図、第３図は従来のけい光ランプの場合の紫外線出力の
特性図である。 １……バルブ、２……放電空間、４……電極、７……け
い光体被膜、８……紫外線吸収被膜。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a sectional view of a fluorescent lamp, FIG. 2 is a characteristic diagram of an ultraviolet output, and FIG. FIG. 4 is a characteristic diagram of an ultraviolet output in the case of a fluorescent lamp. 1 ... bulb, 2 ... discharge space, 4 ... electrode, 7 ... phosphor coating, 8 ... ultraviolet absorbing coating.
Claims (3)
され、内面にけい光体被膜が形成されたガラスバルブ
と、 けい光体被膜の膜厚が大きい箇所には小さい膜厚で、け
い光被膜の膜厚が小さい箇所には大きい膜厚でそれぞれ
ガラスバルブに被覆された透明な酸化チタン被膜とを具
備したことを特徴とするけい光ランプ。1. A glass bulb in which a discharge medium is enclosed and an electrode is sealed, and a phosphor film is formed on the inner surface, and a fluorescent film having a small film thickness is provided in a portion where the film thickness of the phosphor film is large. A fluorescent lamp, comprising: a transparent titanium oxide film coated on a glass bulb with a large film thickness at a portion where the film thickness is small.
覆されていることを特徴とする請求項１記載のけい光ラ
ンプ。2. The fluorescent lamp according to claim 1, wherein the titanium oxide film is coated on an outer surface of the glass bulb.
成されていることを特徴とする請求項１または請求項２
記載のけい光ランプ。3. The method according to claim 1, wherein the titanium oxide film is formed by mixing zinc oxide.
Fluorescent lamp as described.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083858A JP2730259B2 (en) | 1990-03-30 | 1990-03-30 | Fluorescent lamp |
| EP91105067A EP0449307B1 (en) | 1990-03-30 | 1991-03-28 | Fluorescent lamp and its manufacturing method |
| DE69117316T DE69117316T2 (en) | 1990-03-30 | 1991-03-28 | Fluorescent lamp and its manufacturing process |
| US07/677,328 US5227693A (en) | 1990-03-30 | 1991-03-29 | Fluorescent lamp with uv suppressing film and its manufacturing method |
| KR1019910005084A KR940006311B1 (en) | 1990-03-30 | 1991-03-30 | Fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083858A JP2730259B2 (en) | 1990-03-30 | 1990-03-30 | Fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03283346A JPH03283346A (en) | 1991-12-13 |
| JP2730259B2 true JP2730259B2 (en) | 1998-03-25 |
Family
ID=13814383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2083858A Expired - Fee Related JP2730259B2 (en) | 1990-03-30 | 1990-03-30 | Fluorescent lamp |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2730259B2 (en) |
| KR (1) | KR940006311B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673855U (en) * | 1993-03-30 | 1994-10-18 | 晄 廣山 | Light source with UV avoider |
| JP5157258B2 (en) * | 2007-05-29 | 2013-03-06 | 東芝ライテック株式会社 | High pressure discharge lamp and lighting fixture |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5012885A (en) * | 1973-06-06 | 1975-02-10 | ||
| JPS57132665A (en) * | 1981-02-06 | 1982-08-17 | Toshiba Corp | Fluorescent lamp |
| JPS61110959A (en) * | 1984-11-05 | 1986-05-29 | Toshiba Corp | Fluorescent lamp |
| JPH01120756A (en) * | 1987-10-31 | 1989-05-12 | Toshiba Corp | Fluorescent lamp and its manufacture |
| JPH02216751A (en) * | 1989-02-17 | 1990-08-29 | Toshiba Corp | Ultraviolet ray suppressive light source, application agent for it, and its manufacture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6416055U (en) * | 1987-07-21 | 1989-01-26 |
-
1990
- 1990-03-30 JP JP2083858A patent/JP2730259B2/en not_active Expired - Fee Related
-
1991
- 1991-03-30 KR KR1019910005084A patent/KR940006311B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5012885A (en) * | 1973-06-06 | 1975-02-10 | ||
| JPS57132665A (en) * | 1981-02-06 | 1982-08-17 | Toshiba Corp | Fluorescent lamp |
| JPS61110959A (en) * | 1984-11-05 | 1986-05-29 | Toshiba Corp | Fluorescent lamp |
| JPH01120756A (en) * | 1987-10-31 | 1989-05-12 | Toshiba Corp | Fluorescent lamp and its manufacture |
| JPH02216751A (en) * | 1989-02-17 | 1990-08-29 | Toshiba Corp | Ultraviolet ray suppressive light source, application agent for it, and its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| KR940006311B1 (en) | 1994-07-14 |
| JPH03283346A (en) | 1991-12-13 |
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