JPH06243831A - Metal halide lamp with reflector - Google Patents

Abstract

PURPOSE:To reduce the blackening of a luminous tube and to improve the starting property and the service life property, by fixing the luminous tube at the bottom of a paraboloid reflecting mirror, and sealing a specific pressure of argon gas as a start assisting rare gas, together with a halide, in the luminous tube. CONSTITUTION:At the seals at both ends of a luminous tube 1 made of a quartz glass in which the tube wall load is made 40 to 100cm<2>/W, electrodes are sealed through a molybdenum foil, and one end seal is fixed to the bottom opening of a rotary paravoloid reflecting mirror 3 made of a hard quartz glass through an adhesive. While a halide of dysprosium and neodymium is sealed in the tube 1, the argon gas with the pressure 200 to 400Torr is sealed as a start assisting rare gas. By sealing the argon gas as the start assisting rare gas, a metal halide lamp which can reduce the blackening of the luminous tube following the passage of lighting time, and has an excellent starting property and an excellent service life property can be obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は外管を設けずに構成され
る反射鏡付きランプに関し、特にその発光管内封入物と
しての始動補助用希ガスの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp with a reflecting mirror which is constructed without an outer tube, and more particularly to improvement of a rare gas for assisting starting as an enclosure of the arc tube.

【０００２】[0002]

【従来の技術】近年、外管を用いずに発光管のみを回転
放物面反射鏡の底部に固定した小形メタルハライドラン
プは、オーバーヘッドプロジェクタや映写機等の映像用
機器、光学用機器等の光源として使用されている。反射
鏡とランプを一体化する場合、反射鏡の光学上の利用効
率の面から発光部は点光源が理想とされ、発光部をより
小さくした（両電極間のアーク長を短くした）ショート
アーク形ランプが使用されている。又、ショートアーク
キセノンランプに変え演色性が良好で発光効率が高いメ
タルハライドランプがオーバーヘットプロジェクタ、液
晶プロジェクタ等の映像用光源として開発され、特に液
晶プロジェクタは従来のＣＲＴに代る機器として期待さ
れている。2. Description of the Related Art Recently, a small metal halide lamp in which only an arc tube is fixed to the bottom of a rotating parabolic reflector without using an outer tube is used as a light source for video equipment such as overhead projectors and projectors, and optical equipment. It is used. When integrating the reflector and the lamp, it is ideal to use a point light source for the light emitting part from the viewpoint of the optical utilization efficiency of the reflector, and the light emitting part is made smaller (shortening the arc length between both electrodes) Short arc Shaped lamps are used. In addition, a metal halide lamp with good color rendering and high luminous efficiency was developed as a video light source for overhead projectors, liquid crystal projectors, etc., replacing short arc xenon lamps, and liquid crystal projectors are particularly expected to replace conventional CRTs. There is.

【０００３】しかしながら、前記発光管の両端に主電極
を封着し内部に金属ハロゲン化物を封入した小形メタル
ハライドランプはアーク長が短くなるので、発光管の容
量も小さくなり、発光管添加物の封入量も自ずから規定
される。特に発光管始動補助用希ガスの封入量（圧力）
はランプ諸特性に大きく影響し、従来の一般照明用と同
量にすると希ガスの及ぼす作用が異なり発光管が早期に
黒化したり、始動特性が著しく低下するという問題点が
ある。However, since the arc length of the small metal halide lamp in which the main electrodes are sealed at both ends of the arc tube and the metal halide is sealed inside is short, the capacity of the arc tube becomes small and the arc tube additive is sealed. The amount is naturally defined. In particular, the amount (pressure) of rare gas used to aid arc tube start-up
Influences various lamp characteristics, and when the amount is the same as that for conventional general lighting, the effect of rare gas is different and there are problems that the arc tube is blackened early and the starting characteristics are remarkably deteriorated.

【０００４】[0004]

【発明が解決しようとする課題】本発明は前記に鑑みな
されたもので、反射鏡の底部に発光管を固定した反射鏡
付きランプに用いるメタルハライドランプの寿命特性の
改善を図り、始動特性が良好でかつ光学特性が優れた映
像機器等の光源として最適な反射鏡付きメタルハライド
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and improves the life characteristics of a metal halide lamp used for a lamp with a reflecting mirror having an arc tube fixed to the bottom of the reflecting mirror, and has a good starting characteristic. It is an object of the present invention to provide a metal halide with a reflecting mirror, which is optimum as a light source for video equipment having excellent optical characteristics.

【０００５】[0005]

【課題を解決するための手段】上記問題点を解決するた
め、本発明は球面、楕円面、放物面あるいはその組合せ
よりなる反射鏡の底部に外管を設けず石英ガラス製の発
光管よりなるメタルハライドランプを配置してなる反射
鏡付きランプにおいて、管壁負荷を４０〜１００ｃｍ²
／Ｗとしてなる発光管の両端に主電極を封着し、内部に
少なくともディスプロシウムとネオジウムのハロゲン化
物を封入しかつ始動補助用希ガスとしてのアルゴンガス
を２００〜４００Ｔｏｒｒの圧力で封入することを特徴
とする。In order to solve the above problems, the present invention provides a quartz glass arc tube in which an outer tube is not provided at the bottom of a reflecting mirror having a spherical surface, an elliptical surface, a parabolic surface, or a combination thereof. In a lamp with a reflector in which a metal halide lamp is arranged, the tube wall load is 40 to 100 cm ^2.
Main electrodes are sealed at both ends of the arc tube as / W, at least dysprosium and neodymium halides are sealed inside, and argon gas as a rare gas for starting assistance is sealed at a pressure of 200 to 400 Torr. Is characterized by.

【０００６】[0006]

【作用】前記構成により、点灯時間経過に伴う発光管の
失透及び黒化が減少し寿命期間を通して光束維持率が良
好であるばかりでなく、始動電圧の上昇を抑制すること
ができる。With the above construction, devitrification and blackening of the arc tube with the passage of lighting time are reduced, the luminous flux maintenance factor is good throughout the life, and the rise of the starting voltage can be suppressed.

【０００７】[0007]

【実施例】以下、本発明の実施例を図面に基づき説明す
る。図１は反射鏡付きメタルハライドランプの側面図で
あり、図中１は石英ガラス製発光管で、ほぼ球状に形成
され最大内径１０ｍｍ、最大外径１２ｍｍ、内容積が約
０．６ｃｃの設計寸法よりなる。発光管両端の封止部に
はモリブデン箔を介して電極が封着され、電極間距離は
７ｍｍである。又、モリブデン箔に接続され外部に導出
されたリード線が口金２に接続されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a metal halide lamp with a reflecting mirror. In FIG. 1, reference numeral 1 is a quartz glass arc tube, which is formed into a substantially spherical shape and has a maximum inner diameter of 10 mm, a maximum outer diameter of 12 mm, and an internal volume of about 0.6 cc. Become. Electrodes are sealed to the sealed parts at both ends of the arc tube via molybdenum foil, and the distance between the electrodes is 7 mm. A lead wire connected to the molybdenum foil and led to the outside is connected to the base 2.

【０００８】そして、発光管内に沃化ディスプロシウ
ム、沃化ネオジウム及び沃化セシウムを重量比で４：
２：３の比率で、合計の封入量が０．６ｍｇ、バッファ
ガスとしての水銀と共に始動補助用ガスとして２００Ｔ
ｏｒｒのアルゴンが封入してある。又、このような発光
管の一端封止部は硬質ガラス製の回転放物面形状の反射
鏡３の底部開口部に接着剤を介して固定されている。Then, in the arc tube, dysprosium iodide, neodymium iodide and cesium iodide in a weight ratio of 4:
At a ratio of 2: 3, the total enclosed amount is 0.6 mg, and 200 T as a starting auxiliary gas together with mercury as a buffer gas.
Orr argon is sealed. Further, one end sealing portion of such an arc tube is fixed to an opening of a bottom portion of a rotating parabolic reflector 3 made of hard glass with an adhesive.

【０００９】このように構成した反射鏡付きメタルハラ
イドランプは専用安定器を介して管入力１５０Ｗで交流
点灯され、液晶プロジェクタ光源として映像をスクリー
ン上に投影して使用される。The metal halide lamp with a reflecting mirror configured as described above is AC-lit by a tube input of 150 W through a dedicated ballast, and is used as a liquid crystal projector light source by projecting an image on a screen.

【００１０】次に、点灯試験について説明する。前記構
成のランプの発光管希ガスとしてのアルゴンガスの封入
量を変え、それぞれ１００Ｔｏｒｒ（No. １），２００
Ｔｏｒｒ（No. ２），３００Ｔｏｒｒ（No. ３），４０
０Ｔｏｒｒ（No. ４），５００Ｔｏｒｒ（No. ５），６
００Ｔｏｒｒ（No. ６）のランプを各５本ずつ準備して
点灯試験を行なった。点灯条件としては、２時間４５分
点灯、１５分消灯のサイクルで点滅を繰返し、点灯時間
経過に伴う発光管の光束維持率及びその始動特性につい
てを測定した。Next, the lighting test will be described. The amount of argon gas filled as a rare gas in the arc tube of the above-mentioned lamp was changed to 100 Torr (No. 1) and 200, respectively.
Torr (No. 2), 300 Torr (No. 3), 40
0 Torr (No. 4), 500 Torr (No. 5), 6
Five lamps of 00 Torr (No. 6) were prepared and a lighting test was conducted. As the lighting condition, blinking was repeated in a cycle of lighting for 2 hours and 45 minutes and extinguished for 15 minutes, and the luminous flux maintenance factor of the arc tube and its starting characteristics with the passage of lighting time were measured.

【００１１】（１）発光管の黒化状況及び光束維持率 No. ５，６のランプは点灯初期から黒化が進み１００
０時間経過後はかなりの黒化がみられ、光束維持率は７
６〜７８％である。 No. ２，３，４のランプは１０００時間経過後でも多
少の黒化は認められるが、光学用として支障はなく、光
束維持率も９１〜９３％である。 No. １のランプはNo. ５，６のランプに比べ黒化が始
まる時間は遅いが、１０００時間経過後ではかなりの黒
化がみられ、光束維持率は８１％である。(1) Blackening of arc tube and lamps with luminous flux maintenance ratio Nos. 5 and 6 have been blackened since the initial lighting.
After 0 hours, a considerable amount of blackening was observed, and the luminous flux maintenance factor was 7
6 to 78%. The lamps of Nos. 2, 3 and 4 show some blackening even after 1000 hours have passed, but there is no problem for optical use, and the luminous flux maintenance factor is 91 to 93%. The No. 1 lamp takes a longer time to start blackening than the No. 5 and 6 lamps, but after 1000 hours, a considerable amount of blackening was observed, and the luminous flux maintenance factor was 81%.

【００１２】又、図２にNo. １，３，５のランプの点灯
時間経過に伴う光束維持率の変化を示す。図から明らか
なように、本発明ランプ（No. ３）は１０００時間経過
後も光束維持率は９０％以上と良好であった。FIG. 2 shows changes in the luminous flux maintenance factor with the passage of the lighting time of the No. 1, 3, and 5 lamps. As is clear from the figure, the lamp of the present invention (No. 3) had a good luminous flux maintenance factor of 90% or more even after 1000 hours had elapsed.

【００１３】（２）発光管の始動特性 点灯初期はNo. １〜No. ６のいずれのランプも始動電圧
４ＫＶ以内で点灯したが、１０００時間経過後は次の通
りであった。 No. ５，６のランプは始動電圧が８〜１３ＫＶ。 No. ２，３，４のランプは始動電圧が４〜８ＫＶ。 No. １のランプは始動電圧が６〜１０ＫＶ。(2) Starting Characteristics of Arc Tube At the initial stage of lighting, all the lamps No. 1 to No. 6 were turned on at a starting voltage of 4 KV or less, but after 1000 hours, it was as follows. The starting voltage of the No. 5 and 6 lamps is 8 to 13 KV. The starting voltage of No. 2, 3 and 4 lamps is 4 to 8 KV. The No. 1 lamp has a starting voltage of 6 to 10 KV.

【００１４】又、図３にNo. １，３，５のランプの点灯
時間経過に伴う始動電圧の変化を示す。図から明らかな
ように、本発明ランプ（No. ３）は１０００時間経過後
もその始動電圧は６ＫＶ程度であり、点灯に支障が生じ
ることはなかった。Further, FIG. 3 shows changes in the starting voltage with the lapse of lighting time of the lamps Nos. 1, 3, and 5. As is clear from the figure, the lamp of the present invention (No. 3) had a starting voltage of about 6 KV even after 1000 hours, and there was no problem in lighting.

【００１５】このように、発光管内に封入するアルゴン
ガスを２００〜４００Ｔｏｒｒに規定することにより、
ランプ寿命期間中の発光管の黒化を抑制して光束維持率
も良好であり、点灯時間経過に伴う始動電圧の上昇も抑
制することができる。As described above, by defining the argon gas sealed in the arc tube at 200 to 400 Torr,
It is possible to suppress the blackening of the arc tube during the life of the lamp and to improve the luminous flux maintenance factor, and it is also possible to suppress an increase in the starting voltage with the passage of lighting time.

【００１６】なお、前記実施例では管入力１５０Ｗのラ
ンプについて説明したが、他の種類のランプ、例えば２
５０Ｗのランプでもよく、管壁負荷が４０〜１００ｃｍ
² ／Ｗのランプであれば前記と同様の効果が認められ
る。Although a lamp having a tube input of 150 W has been described in the above embodiment, another kind of lamp, for example, 2 lamps is used.
A 50 W lamp may be used, and the tube wall load is 40 to 100 cm.
^{With a 2} / W lamp, the same effect as above can be observed.

【００１７】[0017]

【発明の効果】以上の説明から明らかなように、本発明
は発光管内に封入する始動用希ガスとしてのアルゴンガ
スを所定量封入することにより、ランプ点灯時間経過に
伴う発光管の黒化を低減でき光束維持率の改善を行なう
ことができるばかりでなく、始動特性も良好で、かつ寿
命特性が優れた映像機器等の光源として最適なメタルハ
ライドランプを得ることができる。As is apparent from the above description, according to the present invention, a predetermined amount of argon gas as a starting rare gas to be sealed in the arc tube is sealed so that the arc tube is blackened with the passage of the lamp lighting time. Not only the luminous flux maintenance factor can be reduced but also the luminous flux maintenance factor can be improved, and a metal halide lamp which is excellent in starting characteristics and excellent in life characteristics and which is optimal as a light source for video equipment can be obtained.

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

【図１】本発明に係る反射鏡付きメタルハライドランプ
の一例を示す側面図である。FIG. 1 is a side view showing an example of a metal halide lamp with a reflecting mirror according to the present invention.

【図２】点灯時間経過に伴う発光管の光束維持率の変化
を示す特性図である。FIG. 2 is a characteristic diagram showing a change in luminous flux maintenance factor of an arc tube with the passage of lighting time.

【図３】点灯時間経過に伴うランプ始動電圧の変化を示
す特性図である。FIG. 3 is a characteristic diagram showing a change in a lamp starting voltage with the passage of lighting time.

【符号の説明】[Explanation of symbols]

１ 発光管 ２ 口金 ３ 反射鏡 1 arc tube 2 base 3 reflector

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 球面、楕円面、放物面あるいはその組合
せよりなる反射鏡の底部に外管を設けず石英ガラス製の
発光管よりなるメタルハライドランプを配置してなる反
射鏡付きランプにおいて、管壁負荷を４０〜１００ｃｍ
² ／Ｗとしてなる発光管の両端に主電極を封着し、内部
に少なくともディスプロシウムとネオジウムのハロゲン
化物を封入しかつ始動補助用希ガスとしてのアルゴンガ
スを２００〜４００Ｔｏｒｒの圧力で封入してなる反射
鏡付きメタルハライドランプ。1. A lamp with a reflector, wherein a metal halide lamp made of a quartz glass arc tube is arranged at the bottom of the reflector having a spherical surface, an ellipsoidal surface, a parabolic surface, or a combination thereof, without providing an outer tube. Wall load 40-100 cm
Main electrodes are sealed at both ends of the arc tube which is ² / W, at least dysprosium and neodymium halides are sealed inside, and argon gas as a rare gas for starting assistance is sealed at a pressure of 200 to 400 Torr. Metal halide lamp with reflector.