JPH0831382A - Metal halide lamp equipped with reflecting mirror - Google Patents
Metal halide lamp equipped with reflecting mirrorInfo
- Publication number
- JPH0831382A JPH0831382A JP6161193A JP16119394A JPH0831382A JP H0831382 A JPH0831382 A JP H0831382A JP 6161193 A JP6161193 A JP 6161193A JP 16119394 A JP16119394 A JP 16119394A JP H0831382 A JPH0831382 A JP H0831382A
- Authority
- JP
- Japan
- Prior art keywords
- reflecting mirror
- light emitting
- emitting tube
- light
- metal halide
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶プロジェクタやス
ライドプロジェクタ用等の反射鏡付きメタルハライドラ
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 metal halide lamp with a reflecting mirror for liquid crystal projectors, slide projectors and the like.
【０００２】[0002]
【従来の技術】従来、この種の反射鏡付きメタルハライ
ドランプは、図５に示すように、反射鏡９と、この反射
鏡９の内側に設けられ、かつ両端部に電極２ａ，２ｂを
有する発光管１とからなっており、この発光管１には保
温膜８が形成されている。2. Description of the Related Art Conventionally, as shown in FIG. 5, a metal halide lamp with a reflection mirror has a reflection mirror 9 and a light emission provided inside the reflection mirror 9 and having electrodes 2a and 2b at both ends. The arc tube 1 is provided with a heat insulating film 8 formed thereon.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このような従
来の反射鏡付きメタルハライドランプでは、反射鏡９か
らの投射光以外の、反射鏡９に集光されなかった発光管
１からの射出光が有効に利用されておらず、集光効率が
低いという問題がある。また、発光管１内の金属ハロゲ
ン化物の蒸気圧を高めるために、発光管１の電極近傍の
外面に金属酸化物からなる保温膜８を形成しているた
め、この保温膜８によって発光管１からの射出光が遮断
され、発光管１からの射出光が有効に利用されないとい
う問題もある。However, in such a conventional metal halide lamp with a reflecting mirror, the emitted light from the arc tube 1 which is not focused on the reflecting mirror 9 other than the projected light from the reflecting mirror 9 is used. There is a problem that it is not used effectively and the light collection efficiency is low. Further, in order to increase the vapor pressure of the metal halide in the arc tube 1, the heat insulating film 8 made of a metal oxide is formed on the outer surface of the arc tube 1 in the vicinity of the electrodes. There is also a problem that the light emitted from the arc tube is blocked and the light emitted from the arc tube 1 is not effectively used.
【０００４】本発明は、発光管からの射出光を有効に利
用し、集光効率を高めることのできる反射鏡付きメタル
ハライドランプを提供することを目的としている。An object of the present invention is to provide a metal halide lamp with a reflecting mirror, which can effectively utilize the light emitted from the arc tube and enhance the light collection efficiency.
【０００５】[0005]
【課題を解決するための手段】本発明の反射鏡付きメタ
ルハライドランプは、第１の反射鏡と、この第１の反射
鏡の内側に設けられ、かつ両端部に電極を有する発光管
とを備え、前記発光管に、前記発光管からの射出光を集
光し、かつ前記第１の反射鏡に前記射出光を照射する第
２の反射鏡が設けられている。A metal halide lamp with a reflecting mirror of the present invention comprises a first reflecting mirror and an arc tube provided inside the first reflecting mirror and having electrodes at both ends. A second reflecting mirror that collects light emitted from the light emitting tube and irradiates the first reflecting mirror with the emitted light is provided in the light emitting tube.
【０００６】[0006]
【作用】この構成により、発光管からの射出光を有効に
集光することができる。With this structure, the light emitted from the arc tube can be effectively collected.
【０００７】[0007]
【実施例】以下、本発明の実施例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.
【０００８】図１に本発明の一実施例である定格電力３
５Ｗの反射鏡付きメタルハライドランプを示す。FIG. 1 shows a rated power 3 according to an embodiment of the present invention.
A metal halide lamp with a 5 W reflector is shown.
【０００９】図１に示すように、石英ガラス製の発光管
１の内部には、タングステンからなる一対の電極２ａ，
２ｂが設けられている。電極間距離は点光源に近づける
ために４ｍｍとしている。発光管１の内部には所定量の
水銀，沃化ジスプロシウム，沃化ネオジム，沃化セシウ
ムとともに始動用ガスとしてキセノンガスが封入されて
いる。発光管１の両端には封止部３ａ，３ｂが設けられ
ており、この封止部３ａ，３ｂには電極２ａ，２ｂと接
続されたモリブデンからなる金属箔４ａ，４ｂが気密封
着されている。金属箔４ａ，４ｂはそれぞれ外部導線５
ａ，５ｂが接続され、外部導線５ａ，５ｂは外部に導出
されている。外部導線５ａ，５ｂにはリード線６，７が
それぞれ接続されており、リード線６，７は口金１２の
口金ピン１３ａ，１３ｂに導入され口金ピン１３ａ，１
３ｂの先端においてスポット溶接されている。発光管１
の電極２ａ，２ｂ近傍の外面にはジルコニアからなる保
温膜８が形成されている。発光管１は第１の反射鏡であ
る硬質ガラス製の反射鏡９内に、発光管１の軸と反射鏡
９の軸とが一致して設けられている。As shown in FIG. 1, a pair of electrodes 2a made of tungsten are provided inside an arc tube 1 made of quartz glass.
2b is provided. The distance between the electrodes is set to 4 mm in order to approach the point light source. The arc tube 1 is filled with a predetermined amount of mercury, dysprosium iodide, neodymium iodide, and cesium iodide as xenon gas as a starting gas. Sealing portions 3a and 3b are provided at both ends of the arc tube 1, and metal foils 4a and 4b made of molybdenum connected to the electrodes 2a and 2b are hermetically sealed to the sealing portions 3a and 3b. There is. The metal foils 4a and 4b are external conductors 5 respectively.
a and 5b are connected, and the external conducting wires 5a and 5b are led out to the outside. Lead wires 6 and 7 are connected to the external conducting wires 5a and 5b, respectively, and the lead wires 6 and 7 are introduced into the cap pins 13a and 13b of the cap 12, respectively.
Spot welding is performed at the tip of 3b. Arc tube 1
A heat insulating film 8 made of zirconia is formed on the outer surface near the electrodes 2a and 2b. The arc tube 1 is provided in a reflecting mirror 9 made of hard glass, which is the first reflecting mirror, so that the axis of the arc tube 1 and the axis of the reflecting mirror 9 coincide with each other.
【００１０】口金１２はセメント１４により反射鏡９に
固着されている。反射鏡９はセメント１０により発光管
１に固着されている。なお、反射鏡９は開口径φ５０ｍ
ｍの放物面もしくは楕円面形状であり、反射面には赤外
線を透過する多層干渉膜１１が蒸着されている。The base 12 is fixed to the reflecting mirror 9 with cement 14. The reflecting mirror 9 is fixed to the arc tube 1 with cement 10. The reflector 9 has an aperture diameter of 50 m.
It has a parabolic or elliptical shape of m, and a multilayer interference film 11 that transmits infrared rays is deposited on the reflecting surface.
【００１１】発光管１の投光側である封止部３ａには第
２の反射鏡である厚さ１ｍｍのアルミニウム製の反射鏡
１５がセメント１６によって固着されている。反射鏡１
５は、発光管１からの射出光を集光しかつ反射鏡９にそ
の射出光を照射する折り返し反射鏡である。反射鏡１５
は半径７ｍｍの球面を有し内表面は鏡面仕上げされてい
る。反射鏡１５の焦点位置は反射鏡９の焦点位置と同位
置とした。A second reflecting mirror 15 made of aluminum and having a thickness of 1 mm is fixed to the sealing portion 3a on the light emitting side of the arc tube 1 with cement 16. Reflector 1
Reference numeral 5 is a folding reflecting mirror that collects the emitted light from the arc tube 1 and irradiates the reflecting mirror 9 with the emitted light. Reflector 15
Has a spherical surface with a radius of 7 mm and its inner surface is mirror-finished. The focal position of the reflecting mirror 15 is the same as the focal position of the reflecting mirror 9.
【００１２】図２に示した評価用光学系は、液晶プロジ
ェクタの実機と基本的には同一であり、コンデンサレン
ズ１７，液晶パネルに相当するアパーチャ１８（対角長
０．７インチ），投射レンズ１９およびスクリーン２０
（対角長１４インチ）からなっている。図５に示す封止
部３ａに第２の反射鏡を備えていない従来の反射鏡付き
メタルハライドランプ（以下、従来ランプという）を図
２に示した評価用光学系にて定格電力３５Ｗでスクリー
ン２０に投射したところ、スクリーン中心照度は１００
００ルクスとなったのに対し、上記した本発明の一実施
例の反射鏡付きメタルハライドランプ（以下、本発明ラ
ンプＡという）は、スクリーン中心照度は１２０００ル
クスであることが確認できた。したがって、本発明ラン
プＡは従来ランプと比して投射光量が増大していること
がわかる。これは、発光管からの射出光のうち利用され
ていなかった射出光が反射鏡１５により有効に集光され
たため、集光効率が増大したものである。The evaluation optical system shown in FIG. 2 is basically the same as an actual liquid crystal projector, and includes a condenser lens 17, an aperture 18 (diagonal length of 0.7 inch) corresponding to a liquid crystal panel, and a projection lens. 19 and screen 20
(Diagonal length 14 inches). A conventional metal halide lamp with a reflector (hereinafter referred to as a conventional lamp) having no second reflector in the sealing portion 3a shown in FIG. 5 (hereinafter referred to as a conventional lamp) is used with the evaluation optical system shown in FIG. When projected on, the illuminance at the center of the screen is 100
It was confirmed that the illuminance at the center of the screen was 12000 lux in the metal halide lamp with a reflecting mirror (hereinafter, referred to as Lamp A of the present invention) according to one embodiment of the present invention, whereas the illuminance was 12,000 lux. Therefore, it can be seen that the lamp A of the present invention has an increased amount of projected light as compared with the conventional lamp. This is because the unused light out of the light emitted from the arc tube is effectively collected by the reflecting mirror 15, so that the light collection efficiency is increased.
【００１３】次に本発明の他の実施例について図面を用
いて説明する。図３に示す本発明の他の実施例のメタル
ハライドランプ（以下、本発明ランプＢという）は、上
記本発明ランプＡの構成から、発光管１の電極２ａ，２
ｂ近傍の外面に塗布されているジルコニアからなる保温
膜８を除去したものである。Next, another embodiment of the present invention will be described with reference to the drawings. The metal halide lamp according to another embodiment of the present invention (hereinafter referred to as the present lamp B) shown in FIG. 3 has the same structure as that of the present lamp A but has electrodes 2a, 2 of the arc tube 1.
The heat insulating film 8 made of zirconia applied to the outer surface near b is removed.
【００１４】上記と同様に図２に示した評価用光学系を
用いて本発明ランプＢおよび従来ランプのスクリーン照
度を測定したところ、従来ランプでは、スクリーン中心
照度は１００００ルクスであるのに対し、本発明ランプ
Ｂでは、スクリーン中心照度は１３０００ルクスである
ことが確認できた。したがって、本発明ランプＢは従来
ランプと比して投射光量が増大していることが確認でき
た。また、本発明のランプＢは、本発明ランプＡと比し
て、より投射光量が増大していることが確認できた。こ
れは、上記一実施例と同様に発光管からの射出光のうち
利用されていなかった射出光が反射鏡１５で、より有効
に集光されたため、集光効率が増大したためと考えられ
る。When the screen illuminances of the lamp B of the present invention and the conventional lamp were measured by using the evaluation optical system shown in FIG. 2 in the same manner as described above, the illuminance at the screen center of the conventional lamp was 10,000 lux. With the lamp B of the present invention, it was confirmed that the illuminance at the center of the screen was 13,000 lux. Therefore, it was confirmed that the lamp B of the present invention increased the amount of projected light as compared with the conventional lamp. It was also confirmed that the lamp B of the present invention had a larger amount of projected light than the lamp A of the present invention. It is considered that this is because, as in the case of the above-mentioned one embodiment, the emitted light that was not utilized among the emitted light from the arc tube was more effectively condensed by the reflecting mirror 15, so that the condensing efficiency was increased.
【００１５】図４に本発明ランプＢの分光スペクトル
（曲線イ）と従来ランプの分光スペクトル（曲線ロ）を
それぞれ示す。FIG. 4 shows the spectrum of the lamp B of the present invention (curve B) and the spectrum of the conventional lamp (curve B).
【００１６】図４から明らかなように、本発明ランプＢ
は保温膜８を備えていないにもかかわらず、保護膜８を
備えている従来ランプの分光スペクトルとほとんど同一
であり、発光管１内に封入された金属ハロゲン化物の蒸
気圧が従来ランプと比してほとんど差がないことがわか
る。これは、本発明ランプＢは、反射鏡１５からの照射
光が発光管にも照射されるために、保温膜８がなくても
発光管１の温度が適正温度まで上昇し、発光管１内に封
入された金属ハロゲン化物の蒸気圧を十分に上昇させる
ためである。As is apparent from FIG. 4, the lamp B of the present invention.
Has almost the same spectral spectrum as that of the conventional lamp having the protective film 8 even though the heat insulating film 8 is not provided, and the vapor pressure of the metal halide enclosed in the arc tube 1 is higher than that of the conventional lamp. And it turns out that there is almost no difference. In the lamp B of the present invention, since the light emitted from the reflecting mirror 15 is also applied to the arc tube, the temperature of the arc tube 1 rises to an appropriate temperature even without the heat insulating film 8, and This is for sufficiently increasing the vapor pressure of the metal halide sealed in.
【００１７】[0017]
【発明の効果】以上説明したように、本発明によれば、
第１の反射鏡と、この第１の反射鏡の内側に設けられ、
かつ両端部に電極を有する発光管とを備え、前記発光管
に、前記発光管からの射出光を集光し、かつ前記第１の
反射鏡に前記射出光を照射する第２の反射鏡を設けたこ
とによって、発光管からの射出光の大部分を集光するこ
とが可能となり、投射光量を増大することができ、ま
た、保温膜を形成しなくても発光管内に封入された金属
ハロゲン化物の蒸気圧を十分に上昇させることができ、
適正な分光スペクトルが得られるため、発光管製造工程
において保温膜を形成する工程を省くことができる反射
鏡付きメタルハライドランプを提供することができる。As described above, according to the present invention,
A first reflecting mirror, and provided inside the first reflecting mirror,
And a second reflecting mirror that has an arc tube having electrodes at both ends, collects light emitted from the arc tube in the arc tube, and irradiates the exit light with the first reflecting mirror. By providing it, most of the light emitted from the arc tube can be condensed, the amount of projected light can be increased, and the metal halogen sealed in the arc tube without forming a heat insulating film. The vapor pressure of the compound can be increased sufficiently,
Since a proper spectrum can be obtained, it is possible to provide a metal halide lamp with a reflecting mirror that can omit the step of forming a heat insulating film in the arc tube manufacturing step.
【図１】本発明の一実施例である反射鏡付きメタルハラ
イドランプの一部切欠正面図FIG. 1 is a partially cutaway front view of a metal halide lamp with a reflector according to an embodiment of the present invention.
【図２】評価用光学系の概略図FIG. 2 is a schematic diagram of an evaluation optical system.
【図３】本発明の他の実施例である反射鏡付きメタルハ
ライドランプの一部切欠正面図FIG. 3 is a partially cutaway front view of a metal halide lamp with a reflector according to another embodiment of the present invention.
【図４】本発明の他の実施例である反射鏡付きメタルハ
ライドランプおよび従来の反射鏡付きメタルハライドラ
ンプの分光分布FIG. 4 is a spectral distribution of a metal halide lamp with a reflector according to another embodiment of the present invention and a conventional metal halide lamp with a reflector.
【図５】従来の反射鏡付きメタルハライドランプの一部
切欠正面図FIG. 5 is a partially cutaway front view of a conventional metal halide lamp with a reflector.
１ 発光管 ２ａ，２ｂ 電極 ３ａ，３ｂ 封止部 ８ 保温膜 ９ 第１の反射鏡 １１ 多層干渉膜 １５ 第２の反射鏡 DESCRIPTION OF SYMBOLS 1 Arc tube 2a, 2b Electrodes 3a, 3b Sealing part 8 Heat insulating film 9 First reflecting mirror 11 Multilayer interference film 15 Second reflecting mirror
Claims (2)
側に設けられ、かつ両端部に電極を有する発光管とを備
え、前記発光管に、前記発光管からの射出光を集光し、
かつ前記第１の反射鏡に前記射出光を照射する第２の反
射鏡が設けられていることを特徴とする反射鏡付きメタ
ルハライドランプ。1. A first reflecting mirror, and a light emitting tube provided inside the first reflecting mirror and having electrodes at both ends thereof. The light emitting tube is provided with light emitted from the light emitting tube. Collect light,
A metal halide lamp with a reflecting mirror, wherein the first reflecting mirror is provided with a second reflecting mirror for irradiating the emitted light.
形成していないことを特徴とする請求項１項記載の反射
鏡付きメタルハライドランプ。2. The metal halide lamp with a reflector according to claim 1, wherein a heat insulating film is not formed on the outer surface of the arc tube in the vicinity of the electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16119394A JP3184404B2 (en) | 1994-07-13 | 1994-07-13 | Metal halide lamp with reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16119394A JP3184404B2 (en) | 1994-07-13 | 1994-07-13 | Metal halide lamp with reflector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0831382A true JPH0831382A (en) | 1996-02-02 |
| JP3184404B2 JP3184404B2 (en) | 2001-07-09 |
Family
ID=15730358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16119394A Expired - Lifetime JP3184404B2 (en) | 1994-07-13 | 1994-07-13 | Metal halide lamp with reflector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184404B2 (en) |
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