JP3314627B2 - High pressure mercury discharge lamp - Google Patents
High pressure mercury discharge lampInfo
- Publication number
- JP3314627B2 JP3314627B2 JP24584096A JP24584096A JP3314627B2 JP 3314627 B2 JP3314627 B2 JP 3314627B2 JP 24584096 A JP24584096 A JP 24584096A JP 24584096 A JP24584096 A JP 24584096A JP 3314627 B2 JP3314627 B2 JP 3314627B2
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- pressure mercury
- mercury discharge
- arc tube
- lamp
- 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
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- Discharge Lamps And Accessories Thereof (AREA)
- Discharge Lamp (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶プロジェクタ
やオーバヘッドプロジェクタ等の光学機器のバックライ
トに用いられる高圧水銀放電ランプに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure mercury discharge lamp used for a backlight of an optical device such as a liquid crystal projector or an overhead projector.
【０００２】[0002]
【従来の技術】近年、液晶プロジェクタやオーバヘッド
プロジェクタ等の光学機器のバックライトとして、金属
ハロゲン化物を発光管内に封入し、その金属特有の発光
を利用し、かつ電極間距離を短くしたいわゆるショート
アークタイプのメタルハライドランプを反射鏡と組み合
わせた投射型光源が用いられている。2. Description of the Related Art In recent years, as a backlight for an optical device such as a liquid crystal projector or an overhead projector, a so-called short arc in which a metal halide is sealed in an arc tube, light emission specific to the metal is used, and a distance between electrodes is reduced. A projection type light source in which a metal halide lamp of a type is combined with a reflecting mirror is used.
【０００３】近年、このようなメタルハライドランプ
を、さらに高輝度とするためにショートアーク化が進め
られている。しかしながら、電極間距離が３ｍｍ以下と
なった場合、封入されている水銀の輝線発光強度が増大
し、水銀輝線発光強度と比較して封入金属発光強度が相
対的に低くなる。その結果、ランプの発光スペクトルの
うち赤領域（６１０ｎｍ付近）・青領域（４５０ｎｍ付
近）の相対発光強度が低下し、液晶プロジェクタ用バッ
クライトに求められる赤・緑・青のバランスのとれた発
光スペクトルが得られなかった。[0003] In recent years, a short arc has been promoted to further increase the brightness of such a metal halide lamp. However, when the distance between the electrodes is 3 mm or less, the emission intensity of the encapsulated mercury emission line increases, and the emission intensity of the encapsulated metal becomes relatively lower than the emission intensity of the mercury emission line. As a result, the relative emission intensity in the red region (around 610 nm) and blue region (around 450 nm) of the emission spectrum of the lamp is reduced, and the emission spectrum in which the red, green, and blue required for the backlight for the liquid crystal projector are balanced. Was not obtained.
【０００４】[0004]
【発明が解決しようとする課題】また、点灯中の水銀の
蒸気圧を２０ＭＰａから３５ＭＰａまで上昇させること
により可視域の連続発光を増大させた高圧水銀放電ラン
プを、反射鏡と組み合わせた投射型光源が知られている
（特開平２−１４８５６１号公報）。しかしながら、こ
のような高圧水銀放電ランプは、可視域の連続発光が増
大し赤・緑・青のバランスのとれた発光スペクトルを得
ることはできるが、その高い動作圧により点灯寿命中に
発光管が破損する確率が高くなる。Further, a projection type light source in which a high pressure mercury discharge lamp in which the continuous emission in the visible region is increased by increasing the vapor pressure of mercury during operation from 20 MPa to 35 MPa and a reflecting mirror is used. Is known (JP-A-2-148561). However, such a high-pressure mercury discharge lamp can increase the continuous emission in the visible region and obtain a balanced emission spectrum of red, green, and blue. The probability of breakage increases.
【０００５】本発明は、液晶プロジェクタ用バックライ
トに求められる赤・緑・青のバランスのとれた発光スペ
クトルを得ることができ、また、点灯寿命中において発
光管が破損する確率を低減させることのできる高圧水銀
放電ランプを得ることを目的とする。According to the present invention, it is possible to obtain a balanced emission spectrum of red, green, and blue required for a backlight for a liquid crystal projector, and to reduce the probability that an arc tube is damaged during a lighting life. The object is to obtain a high-pressure mercury discharge lamp that can be used.
【０００６】[0006]
【課題を解決するための手段】本発明の請求項１記載の
プロジェクタ用高圧水銀放電ランプは、内部に一対の電
極が設けられた発光管内に、始動用希ガスとともに点灯
動作中に遊離ハロゲンＣｌ，Ｂｒ，Ｉとなる封入物が封
入され、かつ前記発光管の単位体積当たり１００ｍｇ／
ｃｍ3から１９５ｍｇ／ｃｍ3の範囲で水銀が封入されお
り、点灯電力１５０Ｗである構成を有しており、点灯中
の水銀蒸気圧を１０ＭＰａから１９ＭＰａの圧力とする
ことができ、赤・緑・青のバランスのとれた発光スペク
トルが得られるとともに、点灯中の破損の確率を抑制す
る作用を有する。According to a first aspect of the present invention, there is provided:
In a high-pressure mercury discharge lamp for a projector , an enclosure which becomes free halogen Cl, Br, I during a lighting operation is sealed together with a starting rare gas in an arc tube having a pair of electrodes provided therein, and 100mg / unit volume
mercury O is enclosed in the range of cm 3 of 195mg / cm 3
It has a lighting power of 150 W. The mercury vapor pressure during lighting can be set to a pressure of 10 MPa to 19 MPa, and a balanced emission spectrum of red, green, and blue can be obtained. It has the effect of suppressing the probability of breakage inside.
【０００７】請求項５記載のプロジェクタ用高圧水銀放
電ランプは、請求項１記載の高圧水銀放電ランプにおい
て、前記遊離ハロゲンＣｌ，Ｂｒ，Ｉが前記発光管内に
１０-9から１０-7ｍｏｌ／ｃｍ3の範囲で存在する構成
を有したものであり、ランプ点灯中に蒸発した電極材料
であるタングステンはハロゲンサイクルにより発光管内
壁に付着黒化することなく電極に戻り、点灯寿命中の発
光管黒化を防止する。その結果、発光管黒化による発光
管管壁温度上昇を防止し、点灯寿命中に発光管が破損す
ることを防止する作用を有する。[0007] Projector high pressure mercury discharge lamp according to claim 5, wherein, in the high pressure mercury discharge lamp according to claim 1, wherein the free halogen Cl, Br, from 10 -9 I within the arc tube 10 -7 mol / cm are those having the present structure in three ranges, tungsten is an electrode material evaporated during lamp operation returns to the electrode without adhering blackening the arc tube wall by halogen cycle, the arc tube black during lighting life Prevention. As a result, the arc tube has a function of preventing the arc tube wall temperature from rising due to blackening of the arc tube and preventing the arc tube from being damaged during the lighting life.
【０００８】請求項６記載の高圧水銀放電ランプは、請
求項１記載の高圧水銀放電ランプにおいて、電極管距離
が３．０ｍｍ以下である構成を有しており、赤・青・緑
のバランスのとれた発光スペクトルが得られると同時に
高輝度をも実現する作用を有する。A high pressure mercury discharge lamp according to a sixth aspect of the present invention is the high pressure mercury discharge lamp according to the first aspect, wherein the electrode tube distance is 3.0 mm or less, and the balance of red, blue, and green is maintained. It has the function of realizing high luminance at the same time as obtaining a good emission spectrum.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１に本発明の一実施の形態である点灯電
力１５０Ｗの高圧水銀放電ランプは発光部１ａとこの発
光部１ａの両端に連設された封止部４ａ，４ｂを有する
石英ガラス製の発光管１の内部に、タングステンからな
る一対の電極２ａ，２ｂが電極間距離を１．５ｍｍとし
て設けられている。また、発光管１の内部には水銀３が
１５０ｍｇ／ｃｍ3の密度で封入され、かつ始動用希ガ
スとしてアルゴンガスが１００ｈＰａ、点灯動作中に遊
離してハロゲンとなる封入物としてＣＨ2Ｂｒ2が５×１
０-9ｍｏｌ／ｃｍ3の密度でそれぞれ封入されている。FIG. 1 shows a high-pressure mercury discharge lamp with a lighting power of 150 W according to an embodiment of the present invention, which is made of quartz glass having a light emitting portion 1a and sealing portions 4a and 4b provided at both ends of the light emitting portion 1a. Inside the arc tube 1, a pair of electrodes 2a and 2b made of tungsten are provided with a distance between the electrodes of 1.5 mm. Further, mercury 3 is sealed in the arc tube 1 at a density of 150 mg / cm 3 , argon gas is used as a starting rare gas at 100 hPa, and CH 2 Br 2 is used as a sealed material which is released during lighting operation and becomes halogen. Is 5 × 1
Each is sealed at a density of 0 -9 mol / cm 3 .
【００１１】封入物であるＣＨ2Ｂｒ2はランプ点灯動作
中に分解され、Ｃｌ，Ｂｒ，Ｉは発光管１内に１×１０
-8ｍｏｌ／ｃｍ3の密度で存在することとなる。また、
封止部４ａ，４ｂには、電極２ａ，２ｂが発光部１ａ内
に位置するように、電極２ａ，２ｂと接続されたモリブ
デンからなる金属箔５ａ，５ｂが気密封着されている。
なお、金属箔５ａ，５ｂには外部導線６ａ，６ｂの一端
がそれぞれ接続され、外部導線６ａ，６ｂの他端は発光
管１の外部に導出されている。CH 2 Br 2, which is an enclosure, is decomposed during the operation of lighting the lamp, and Cl, Br, and I are contained in the arc tube 1 at a concentration of 1 × 10 2.
It will be present at a density of -8 mol / cm 3. Also,
Metal foils 5a and 5b made of molybdenum connected to the electrodes 2a and 2b are hermetically sealed to the sealing portions 4a and 4b so that the electrodes 2a and 2b are located in the light emitting portion 1a.
One ends of the external conductors 6a, 6b are connected to the metal foils 5a, 5b, respectively, and the other ends of the external conductors 6a, 6b are led out of the arc tube 1.
【００１２】本実施の形態の高圧水銀放電ランプ（以
下、本発明品という）を、点灯電力１５０Ｗで点灯させ
たときの分光スペクトル、および、電極間距離が３ｍｍ
で、封入物としてＤｙ−Ｎｄ−Ｉｎ−Ｃｓを封入した従
来の２５０Ｗメタルハライドランプ（以下、従来品とい
う）の分光スペクトルを図２にそれぞれ示す。なお、図
２において、本発明品を実線で、従来品を破線でそれぞ
れ示す。The high pressure mercury discharge lamp of the present embodiment (hereinafter referred to as the present invention) has a spectral spectrum and a distance between the electrodes of 3 mm when lit at a lighting power of 150 W.
FIG. 2 shows spectral spectra of a conventional 250 W metal halide lamp (hereinafter, referred to as a conventional product) in which Dy-Nd-In-Cs is sealed as a fill. In FIG. 2, the product of the present invention is indicated by a solid line, and the conventional product is indicated by a broken line.
【００１３】図２に示すように、電極間距離が３ｍｍの
場合、従来品は、緑（５３５ｎｍ〜５６５ｎｍ）に対し
て赤（６００ｎｍ〜６２５ｎｍ）・青（４３５ｎｍ〜４
６５ｎｍ）の発光強度が低下し色バランスが悪くなって
いるのに比較して、本発明品では電極間距離が１．５ｍ
ｍにもかかわらず赤（６００ｎｍ〜６２５ｎｍ）・緑
（５３５ｎｍ〜５６５ｎｍ）・青（４３５ｎｍ〜４６５
ｎｍ）の発光強度バランスが良好であることがわかる。As shown in FIG. 2, when the distance between the electrodes is 3 mm, the conventional product is red (600 nm to 625 nm) and blue (435 nm to 4 nm) with respect to green (535 nm to 565 nm).
65 nm), the distance between the electrodes is 1.5 m in the product of the present invention, as compared with the case where the emission intensity of
red (600 nm to 625 nm), green (535 nm to 565 nm), and blue (435 nm to 465) despite m.
It can be seen that the emission intensity balance of (nm) is good.
【００１４】また、水銀の封入量について検討したとこ
ろ、発光管の単位体積当たり１００ｍｇ／ｃｍ3以上の
水銀を発光管に封入すれば、従来品と比較して良好な発
光スペクトルが得られることが判明した。Investigation of the amount of mercury enclosed revealed that if more than 100 mg / cm 3 of mercury per unit volume of the arc tube is enclosed in the arc tube, a better emission spectrum can be obtained as compared with the conventional product. found.
【００１５】次に、発光管１の単位体積当たり７５ｍｇ
／ｃｍ3から２３０ｍｇ／ｃｍ3まで水銀量を封入したラ
ンプを試作し、２０００時間まで点灯寿命試験を行った
結果を表１に示す。また、発光強度のバランスについて
も表１に示した。なお、○は好ましいことを、×は好ま
しくないことを示す。Next, 75 mg per unit volume of the arc tube 1
Table 1 shows the results of a trial production of a lamp in which the amount of mercury was sealed from / cm 3 to 230 mg / cm 3 and a lighting life test up to 2000 hours. Table 1 also shows the balance of the light emission intensity. ○ indicates that it is preferable, and X indicates that it is not preferable.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１に示すように、水銀を１００ｍｇ／ｃ
ｍ3から１９５ｍｇ／ｃｍ3まで封入したランプは２００
０時間までランプは破損しなかったが、水銀を７５ｍｇ
／ｃｍ3封入したランプでは、寿命中の破損は生じない
が、発光強度バランスが好ましくなかった。また、水銀
を２０５ｍｇ／ｃｍ3封入したランプでは発光強度のバ
ランスは良好であったが１０本中１本に破損が生じるこ
とが確認され、さらに、水銀を２３０ｍｇ／ｃｍ3封入
したランプでは発光強度のバランスは良好であったが１
０本中３本に破損が生じることが確認された。また、こ
れによって、水銀の蒸気圧が２０ＭＰａ以上となると、
発光管に破損が生じる確率が高くなることが確認され
た。As shown in Table 1, mercury was 100 mg / c.
The lamp sealed from m 3 to 195 mg / cm 3 is 200
The lamp did not break until 0 hours, but 75 mg of mercury
/ Cm 3 does not cause damage during the life of the lamp, but the emission intensity balance is not favorable. Further, it was confirmed that the lamp in which mercury was encapsulated at 205 mg / cm 3 had a good emission intensity balance, but one out of ten lamps was damaged, and the lamp in which mercury was encapsulated at 230 mg / cm 3 was luminous intensity. Balance was good but 1
It was confirmed that three of the 0 pieces were damaged. When the vapor pressure of mercury becomes 20 MPa or more,
It was confirmed that the probability of damage to the arc tube was increased.
【００１８】この結果より、寿命中の破損を抑制するた
めには、発光管の単位体積当たり１００ｍｇ／ｃｍ3か
ら１９５ｍｇ／ｃｍ3の範囲で水銀を封入することが有
効であることがわかった。[0018] From these results, in order to suppress damage in life was found to be effective to encapsulate the mercury in the range of unit volume per 100 mg / cm 3 of arc tube 195 mg / cm 3.
【００１９】また図１に示す発光管１に遊離ハロゲンと
なる封入物を封入せず、水銀のみを封入したランプを点
灯寿命試験した結果、点灯１００時間以内で電極材料で
あるタングステンが飛散し発光管内壁に付着して黒化が
発生した。一方、ハロゲンＣｌ，Ｂｒ，Ｉを１０-10か
ら１０-3ｍｏｌ／ｃｍ3の範囲で封入したランプを点灯
寿命試験した結果、点灯１００時間以内でほとんど黒化
は観察されなかった。３０００時間まで点灯したランプ
でも顕著な黒化は発生しなかったが、ハロゲンＣｌ，Ｂ
ｒ，Ｉを１０-9から１０-7ｍｏｌ／ｃｍ3の範囲で封入
したランプは特に良好な結果を示した。これは、ランプ
点灯中に電極から蒸発した電極材料であるタングステン
がハロゲンサイクルにより発光管内壁に付着することな
く電極に戻るため、発光管内壁の黒化を抑制したためで
ある。またハロゲンＣｌ，Ｂｒ，Ｉの中では、特にＢｒ
に発光管内壁黒化抑制に効果があった。In addition, as a result of a lighting life test of a lamp in which only the mercury is sealed in the arc tube 1 shown in FIG. Blackening occurred due to adhesion to the inner wall of the tube. On the other hand, as a result of a lighting life test of a lamp in which halogen Cl, Br, I was sealed in a range of 10 −10 to 10 −3 mol / cm 3 , almost no blackening was observed within 100 hours of lighting. No remarkable blackening occurred even with a lamp lit up to 3000 hours, but halogen Cl, B
Lamps containing r and I in the range of 10 -9 to 10 -7 mol / cm 3 showed particularly good results. This is because the tungsten, which is an electrode material evaporated from the electrode during the operation of the lamp, returns to the electrode without being attached to the inner wall of the arc tube due to a halogen cycle, thereby suppressing blackening of the inner wall of the arc tube. Of the halogen Cl, Br, I, in particular, Br
This was effective in suppressing the blackening of the arc tube inner wall.
【００２０】また、上記実施の形態の高圧水銀放電ラン
プにおいて、ＣＨ2Ｂｒ2の代わりに、ＣＨ2Ｃｌ2，ＣＨ
2Ｉ2，ＣＨ3Ｃｌ，ＣＨ3Ｂｒ，ＣＨ3Ｉ，ＣＨＣｌ3，Ｃ
ＨＢｒ3，ＣＨＩ3のうちいずれか１つを用いても同様な
効果を得ることができる。Further, in the high-pressure mercury discharge lamp of the above embodiment, CH 2 Cl 2 , CH 2 is used instead of CH 2 Br 2.
2 I 2 , CH 3 Cl, CH 3 Br, CH 3 I, CHCl 3 , C
The same effect can be obtained by using any one of HBr 3 and CHI 3 .
【００２１】[0021]
【発明の効果】以上のように、本発明の高圧水銀放電ラ
ンプは、高輝度で、かつ赤・緑・青のバランスのとれた
発光スペクトルが得られるとともに、点灯寿命中に発光
管が破損することを抑制することができる。As described above, the high-pressure mercury discharge lamp of the present invention can provide a high-luminance, balanced emission spectrum of red, green, and blue, and can damage the arc tube during its operating life. Can be suppressed.
【図１】本発明の一実施の形態である高圧水銀放電ラン
プ正面図FIG. 1 is a front view of a high-pressure mercury discharge lamp according to an embodiment of the present invention.
【図２】本発明の一実施の形態である高圧水銀放電ラン
プと従来のメタルハライドランプとの分光スペクトルの
比較を示す図FIG. 2 is a diagram showing a comparison of spectral spectra between a high-pressure mercury discharge lamp according to an embodiment of the present invention and a conventional metal halide lamp.
１ 発光管 １ａ 発光部 ２ａ，２ｂ 電極 ３ 水銀 ４ａ，４ｂ 封止部 ５ａ，５ｂ 金属箔 ６ａ，６ｂ 外部導線 DESCRIPTION OF SYMBOLS 1 Arc tube 1a Light emitting part 2a, 2b Electrode 3 Mercury 4a, 4b Sealing part 5a, 5b Metal foil 6a, 6b External conducting wire
Claims (6)
に、始動用希ガスとともに点灯動作中に遊離ハロゲンＣ
ｌ，Ｂｒ，Ｉとなる封入物が封入され、かつ前記発光管
の単位体積当たり１００ｍｇ／ｃｍ3から１９５ｍｇ／
ｃｍ3の範囲で水銀が封入されており、点灯電力１５０
Ｗであることを特徴とするプロジェクタ用高圧水銀放電
ランプ。1. An arc tube having a pair of electrodes provided therein contains a free halogen C during a lighting operation together with a starting rare gas.
l, Br, and I are sealed, and 100 to 195 mg / cm 3 per unit volume of the arc tube.
Mercury is sealed in the range of cm 3 and the lighting power is 150
W is a high-pressure mercury discharge lamp for a projector .
ｒ2またはＣＨ2Ｉ2であることを特徴とする請求項１記
載のプロジェクタ用高圧水銀放電ランプ。2. The method according to claim 1, wherein said filling material is CH 2 Cl 2 or CH 2 B.
r 2 or CH 2 I 2 in claim 1 projector for a high-pressure mercury discharge lamp, wherein a is.
またはＣＨ3Ｉであることを特徴とする請求項１記載の
プロジェクタ用高圧水銀放電ランプ。3. The method according to claim 1, wherein the filling is CH 3 Cl or CH 3 Br.
Or CH 3 I.
High-pressure mercury discharge lamp for projectors .
またはＣＨＩ3であることを特徴とする請求項１記載の
プロジェクタ用高圧水銀放電ランプ。4. The method according to claim 1, wherein the filling is CHCl 3 or CHBr 3.
According to claim 1, wherein the or CHI 3
High-pressure mercury discharge lamp for projectors .
発光管内に１０-9から１０-7ｍｏｌ／ｃｍ3の範囲で存
在することを特徴とする請求項１ないし請求項４記載の
プロジェクタ用高圧水銀放電ランプ。Wherein said free halogen Cl, Br, I will claims 1 to 4, characterized in that present in the range of 10 -9 10 -7 mol / cm 3 in the <br/> arc tube Stated
High-pressure mercury discharge lamp for projectors .
を特徴とする請求項１ないし請求項４記載のプロジェク
タ用高圧水銀放電ランプ。6. The project according to claim 1, wherein a distance between the electrodes is 3.0 mm or less.
A high-pressure mercury discharge lamp for data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24584096A JP3314627B2 (en) | 1996-09-18 | 1996-09-18 | High pressure mercury discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24584096A JP3314627B2 (en) | 1996-09-18 | 1996-09-18 | High pressure mercury discharge lamp |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001265544A Division JP2002083567A (en) | 2001-09-03 | 2001-09-03 | High-pressure mercury discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1092378A JPH1092378A (en) | 1998-04-10 |
| JP3314627B2 true JP3314627B2 (en) | 2002-08-12 |
Family
ID=17139640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24584096A Expired - Lifetime JP3314627B2 (en) | 1996-09-18 | 1996-09-18 | High pressure mercury discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3314627B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6559600B1 (en) | 1998-11-17 | 2003-05-06 | Matsushita Electric Industrial Co., Ltd. | Discharge lamp, light source and projecting display unit |
| JP2001266798A (en) | 2000-03-15 | 2001-09-28 | Nec Corp | High-pressure discharge lamp |
-
1996
- 1996-09-18 JP JP24584096A patent/JP3314627B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1092378A (en) | 1998-04-10 |
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