JPS61181056A - High pressure discharge lamp - Google Patents

Abstract

PURPOSE:To increase light output power by forming, on the outer surface of a light-emitting tube, a conductive thin layer transmitting visible rays, and a layer protecting the former layer and reflecting heat rays. CONSTITUTION:To both ends of a light-emitting tube 3 made of quartz, a couple of electric poles 1, 1' and an auxiliary pole 2 for starting up are enclosed. Inside the tube, iodides of Dy, Na, Tl and moreover, mercury, inactive argon gas are also enclosed. To both ends of the tube, power supplying wires to elec tric poles 1, 1' and the auxiliary pole 2 for starting up are connected. A thermal switch 4, for instance, connects the auxiliary pole 2 for starting up to the pole 1 so as to eliminate potential difference therebetween while the light-emitting tube 3 is lighting. A starting up unit consisting of a thermal switch 6 and a fixed resistance 7 is installed between power-supplying wires 5, 5' connected to both electric poles 1, 1'. Here, the surface of the light-emitting tube 3, are applied with a conductive thin film 8 made of (Sn-O), and multilayers films 9 made of TiO2 and SiO2 protecting the former conductive film and reflecting heat rays. With this constitution, starting-up characteristic is improved, and moreover, the fraction of light shut off at the conventional lamp by a heat insulator film is also effectively utilized.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、高圧放電灯に係シ、特に始動性を改善し、光
出力改善に好適な発光管表面に塗着する薄膜に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to high-pressure discharge lamps, and particularly to a thin film applied to the surface of an arc tube that improves startability and is suitable for improving light output.

〔発明の背景〕[Background of the invention]

発光管に近接導体を施し、始動電圧を低下させることは
、高圧ナトリウムランプでは公知である。It is known in high pressure sodium lamps to provide a proximal conductor to the arc tube to reduce the starting voltage.

たとえば、’３ｔａｒｔｉｎｇ　ｖｏｌｔａｇｅ　ｏｆ
　）ｉｉｇｈｐｒｅｓｓｕｒｅ　３ｏｄｉｕｍ　Ｌａｍ
ｐ”Ｋｕｎｉｈｉｋｏ　ＴａｋａｈａｓｈｉＪ、Ｊ、Ａ
、Ｐ、（ｖｏｔ２２．Ａ１１．１９８３１）１６６３〜
１６６８）。また、蛍光ランプでは管内面に導電性薄膜
を塗布して始動を改善している。次とえば１照明ハンド
ブツク”照明学会編　オーム社１９７８年、ｐ１６４゜ そして、石英を発光管とする高圧水銀灯、メタルハライ
ドランプでは、起動補助極が用いられている。しかしな
がら、始動性と光出力とを共に向上させる試みはなされ
ていない。For example, '3tarting voltage of
)iiipressure 3odium Lam
p”Kunihiko TakahashiJ, J, A
, P, (vot22.A11.19831) 1663~
1668). Additionally, in fluorescent lamps, a conductive thin film is coated on the inner surface of the tube to improve starting. For example, 1. Illumination Handbook, edited by the Illuminating Society of Japan, Ohmsha, 1978, p. 164. And, in high-pressure mercury lamps and metal halide lamps that use quartz as an arc tube, an auxiliary starting pole is used. No attempt has been made to improve them together.

〔発明の目的〕[Purpose of the invention]

したがって、本発明の目的は、光出力をも向上させ得る
高圧放電灯を提供することにある。Therefore, an object of the present invention is to provide a high-pressure discharge lamp whose light output can also be improved.

〔発明の概要〕[Summary of the invention]

上記目的を達成するため本発明においては、発光管の表
面に透明導電性薄膜を施してその始動性を改善し、さら
に導電性薄膜を保護し、かつ熱線を反射させる薄膜を施
すことによシ、発光出力を改善するようにしたことを特
徴としている。In order to achieve the above object, in the present invention, a transparent conductive thin film is applied to the surface of the arc tube to improve its startability, and a thin film is further applied to protect the conductive thin film and reflect heat rays. , which is characterized by improved light output.

りまシ、セラミック発光管を用いる高圧ナトリラムラン
プに用いることにより効果が得られ、また、高圧水銀灯
、メタルハライドランプのような石英製の管径の太い発
光管に対する近接導体の始動改善効果は、線より管全体
を覆う膜の方が効果があり導電性薄膜がよい。一方、動
作時の発光管表面の高温において導電性薄膜を保護する
ために耐熱性の薄膜による保護被覆が必要である。この
保護被覆膜を、熱線反射する薄膜すなわち屈折率の異な
る２種たとえばＴ　１ｃ）ｚ　、　Ｓ　ｉＯｚの交互多
層薄膜にすることによシ、発光管内の温度を上げ光出力
の同上を図ることができる。This effect can be obtained by using it in high-pressure natrilum lamps that use ceramic arc tubes, and the starting improvement effect of adjacent conductors for large-diameter quartz arc tubes such as high-pressure mercury lamps and metal halide lamps is as follows. A film that covers the entire tube is more effective than a wire, and a conductive thin film is better. On the other hand, in order to protect the conductive thin film at high temperatures on the surface of the arc tube during operation, a protective coating with a heat-resistant thin film is required. By making this protective coating film a thin film that reflects heat rays, that is, an alternating multilayer thin film of two types with different refractive indexes, such as T 1c)z and SiOz, the temperature inside the arc tube can be raised and the light output can be increased. Can be done.

〔発明の実施例〕[Embodiments of the invention]

実施例につき、第１図において詳しく説明する。 An embodiment will be described in detail with reference to FIG.

両端に一対の電極１．１’、および１つの起動補助極２
を封入し、内部に、Ｄｙ、Ｎａ、Ｔｔの沃化物の他に、
水銀および不活性ガスとして、アルゴンを封入した石英
製の発光管３は、その両端で電極１．１′および起動補
助極２への電力供給線が接続されている。起動補助極２
と電極１との間には、発光管３の点灯時はその間の電位
をなくすためたとえば、熱応動のスイッチ４により接続
する。両電極１，１′への電力供給線５，５′の間には
、熱応動スイッチ６と固定抵抗７よりなる始動ユニット
を備えている。ここで、発光管３の表面には、（Ｓｎ−
０）よりなる導電性薄膜８とこれを保護しかつ熱線を反
射するＴｉＯ２と５ｉＯｚよりなる多層膜９が施されて
いる。発光管３および始動ユニット、発光管３の支持を
兼ねた電力供給線５゜５′は、外球パルプ１０に封止さ
れ通常の方法で口金１１を取付ける。この４００Ｗの放
電灯と、導電性薄膜８及び熱線反射膜９がなく発光管の
電極周辺（一方）に保温膜を塗布した従来の４００Ｗの
放電灯との始動性の比較および、光出力の比較を表１に
示す。A pair of electrodes 1.1' at both ends, and one starting auxiliary pole 2
In addition to the iodides of Dy, Na, and Tt,
A quartz arc tube 3 filled with mercury and argon as an inert gas is connected at both ends to an electrode 1.1' and a power supply line to the starting auxiliary pole 2. Starting auxiliary pole 2
and the electrode 1 are connected by, for example, a thermally responsive switch 4 in order to eliminate the potential therebetween when the arc tube 3 is turned on. A starting unit consisting of a thermally responsive switch 6 and a fixed resistor 7 is provided between the power supply lines 5, 5' to the two electrodes 1, 1'. Here, on the surface of the arc tube 3, (Sn-
0) and a multilayer film 9 made of TiO2 and 5iOz that protects the conductive thin film 8 and reflects heat rays. The arc tube 3, the starting unit, and the power supply line 5'5' which also serves to support the arc tube 3 are sealed in the outer bulb pulp 10, and a cap 11 is attached in the usual manner. Comparison of startability and light output between this 400W discharge lamp and a conventional 400W discharge lamp that does not have a conductive thin film 8 or a heat ray reflective film 9 and has a heat insulating film applied around (one side) of the electrode of the arc tube. are shown in Table 1.

表　　　１ このように改善される理由は、 導電性薄膜８の存在により、発光管３内の両電極１，１
′間の電場の効果により、始動性が改善でき、さらに熱
線反射膜９の効果によシ封入沃化物の蒸気圧を高め、か
つ従来の保温膜によりさえぎられていた光の分の有効化
が図れたことによる。Table 1 The reason for this improvement is that due to the presence of the conductive thin film 8, both electrodes 1, 1 in the arc tube 3
Due to the effect of the electric field between This is due to the fact that it was planned.

なお、上記実施例はメタルハライドランプについてのも
のであるが、高圧水銀灯、高圧ナトリウムランプにおい
ても同様の効果が得られることは言うまでもない。なお
、導電性薄膜は５ｎ−０以外の金属酸化物や金属であっ
てもよく、熱線反射膜もＴｉＯ２，５ｉＯｚ以外のもの
であっても良いことはもちろんであるっ 〔発明の効果〕 以上述べたごとく本発明によれば、始動性の改善の他に
光出力の増加ができるので、放電灯の性能を一段と高め
る効果がある。Although the above embodiments are related to metal halide lamps, it goes without saying that similar effects can be obtained with high-pressure mercury lamps and high-pressure sodium lamps. It goes without saying that the conductive thin film may be made of a metal oxide or metal other than 5n-0, and the heat ray reflective film may also be made of a material other than TiO2, 5iOz. [Effects of the Invention] As stated above. According to the present invention, in addition to improving the startability, it is possible to increase the light output, which has the effect of further enhancing the performance of the discharge lamp.

また、この発明によれば、水銀ランプの始動の改善がで
き、寒冷地における始動不法の問題も解決できる他、１
００Ｖｔ源での始動も可能となる。Further, according to the present invention, starting of a mercury lamp can be improved, and the problem of illegal starting in cold regions can be solved.
Starting with a 00Vt source is also possible.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明を説明するための高圧放電灯の概略構
成図である。 １．１′・・・電極、２・・・起動補助極、３・・・発
光管、６・・・熱応動スイッチ、７・・・固定抵抗、８
・・・導電性薄膜、９・・・熱線反射膜。 代理人　弁理士　小川勝馬　　゛ ゛（・ 手　　続　　補　　正　　書　　Ｃ方式）昭和　６藉　
鴨　２＾FIG. 1 is a schematic configuration diagram of a high pressure discharge lamp for explaining the present invention. 1.1'... Electrode, 2... Starting auxiliary pole, 3... Arc tube, 6... Thermal response switch, 7... Fixed resistor, 8
... Conductive thin film, 9... Heat ray reflective film. Agent: Patent attorney Katsuma Ogawa ゛゛ (Procedural amendment C method) Showa 6
Duck 2^

Claims (1)

【特許請求の範囲】 １、石英又は、透光性セラミックよりなる発光管の外表
面に、可視光を透過する導電性薄膜と、これを保護しか
つ熱線を反射する薄膜とを形成してなることを特徴とす
る高圧放電灯。 ２、上記導電性薄膜が金属酸化物よりなり、これを保護
しかつ熱線反射する上記薄膜がＴｉＯ＿２、ＳｉＯ＿２
の多層膜であることを特徴とする第１項の高圧放電灯。[Claims] 1. A conductive thin film that transmits visible light and a thin film that protects the thin film and reflects heat rays are formed on the outer surface of an arc tube made of quartz or translucent ceramic. A high pressure discharge lamp characterized by: 2. The conductive thin film is made of metal oxide, and the thin film that protects it and reflects heat rays is TiO_2, SiO_2.
The high pressure discharge lamp according to item 1, characterized in that it is a multilayer film.