JP4577187B2 - Lamp with reflector - Google Patents
Lamp with reflector Download PDFInfo
- Publication number
- JP4577187B2 JP4577187B2 JP2005321147A JP2005321147A JP4577187B2 JP 4577187 B2 JP4577187 B2 JP 4577187B2 JP 2005321147 A JP2005321147 A JP 2005321147A JP 2005321147 A JP2005321147 A JP 2005321147A JP 4577187 B2 JP4577187 B2 JP 4577187B2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- light
- reflecting mirror
- lamp
- reflector
- 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
Links
Landscapes
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
本発明は、プロジェクターやプロジェクションＴＶのバックライト等として使用される反射鏡付きランプに関する。 The present invention relates to a lamp with a reflector used as a backlight of a projector or a projection TV.
この種の反射鏡付きランプは、例えば図３の如く、発光管３１の発光部３２に、一対のタングステン電極３３Ｒ、３３Ｌが対向して配置されると共に、水銀と、沃素や臭素などのハロゲンと、アルゴンガスなどの希ガスとが封入された高圧放電ランプ３０が、その電極軸を凹面反射鏡３４の光軸Ｘと同軸的に配して該反射鏡３４のボトム部３５に固定されたものが一般的であり、特にプロジェクターやプロジェクションＴＶに用いる高圧放電ランプは、小型で高輝度、長寿命であることが要求されるため、電極３３Ｒ、３３Ｌから蒸発して発光部３２の内面に付着したタングステンを電極３３Ｒ、３３Ｌへ戻すタングステン−ハロゲンサイクルによって発光部３２の早期黒化を防止すると共に、電極３３Ｒ及び３３Ｌ間の距離を狭めてアーク長を短くし、且つ発光部３２の単位容積当りの水銀封入量を多くしてランプ点灯時における動作圧（発光部３２内の水銀蒸気圧）を高めることにより、小型で点光源に近い高輝度発光が得られるようにしたショートアークタイプの高圧放電ランプが用いられている（特許文献１参照）。 In this type of lamp with a reflector, for example, as shown in FIG. 3, a pair of tungsten electrodes 33R and 33L are arranged opposite to a light emitting portion 32 of an arc tube 31, and mercury and halogen such as iodine and bromine are used. A high-pressure discharge lamp 30 in which a rare gas such as argon gas is enclosed is fixed to the bottom portion 35 of the reflecting mirror 34 with its electrode axis arranged coaxially with the optical axis X of the concave reflecting mirror 34 In particular, high pressure discharge lamps used for projectors and projection TVs are required to be small, have high brightness, and have a long life. Therefore, they evaporate from the electrodes 33R and 33L and adhere to the inner surface of the light emitting unit 32. The tungsten-halogen cycle that returns tungsten to the electrodes 33R and 33L prevents premature blackening of the light emitting section 32, and the arc between the electrodes 33R and 33L is reduced in distance. Is reduced in size and the amount of mercury enclosed per unit volume of the light emitting unit 32 is increased to increase the operating pressure when the lamp is lit (mercury vapor pressure in the light emitting unit 32). A short arc type high-pressure discharge lamp is used (see Patent Document 1).
しかし、点光源に近い高輝度発光を得るために、電極間距離を狭めてアーク長を短くすると、ランプ電圧が低下してランプ電流が増大し、それにより電極３３Ｒ、３３Ｌの温度が過度に上昇してタングステンや該タングステンに含まれる不純物の蒸発作用が促進されるため、発光部３２の早期黒化を惹き起こすおそれがあり、また、発光部３２の水銀封入量を多くしてランプ点灯時の動作圧を高めると、僅かな黒化が生じても発光部３２が破裂するおそれがあるから、アーク長を短くしたり動作圧を高めるにも限界がある。 However, if the arc length is shortened by shortening the distance between the electrodes in order to obtain high-intensity light emission close to a point light source, the lamp voltage decreases and the lamp current increases, thereby excessively increasing the temperature of the electrodes 33R and 33L. Since the evaporation of tungsten and impurities contained in the tungsten is promoted, there is a risk of causing early lightening of the light emitting portion 32. Also, the amount of mercury enclosed in the light emitting portion 32 is increased, and the lamp is turned on. When the operating pressure is increased, there is a risk that the light emitting section 32 may burst even if slight blackening occurs, and there is a limit to shortening the arc length or increasing the operating pressure.
そこで、高圧放電ランプの発光部の形状に工夫を施してその発光部から放射される光の利用効率を高めようとする提案がなされており、例えば、発光部から被照射領域に向かわない方向へ放射される光を有効利用するために、その光の放射方向に位置する発光部の特定部位の外表面と内表面をアーク中心（発光点）を中心とする球面に形成すると共に、その外表面に反射膜を形成して、該反射膜で発光部から放射される光を反射してアーク領域に戻し、その戻った反射光を凹面反射鏡で反射させて被照射領域に向かわせる発明が提案されている（特許文献２参照）。しかしながら、発光部の特定部位の外表面と内表面を球面に形成する加工は非常に困難であり、まして、両面揃ってアーク中心を中心とする球面に加工することは事実上不可能であるから、発光部から放射される光を効率良くアーク領域に戻すことはできないし、発光部から放射される光を発光部内に戻すと、ランプ温度の上昇を招いて不具合発生の原因となる。 Therefore, a proposal has been made to improve the utilization efficiency of light emitted from the light emitting part by devising the shape of the light emitting part of the high-pressure discharge lamp. For example, in a direction not directed from the light emitting part to the irradiated region. In order to make effective use of the emitted light, the outer surface and inner surface of a specific part of the light emitting part located in the light emission direction are formed into a spherical surface centered on the arc center (light emitting point), and the outer surface The invention proposes an invention in which a reflection film is formed on the surface, the light emitted from the light emitting part is reflected by the reflection film and returned to the arc region, and the reflected light that has returned is reflected by the concave reflecting mirror toward the irradiated region. (See Patent Document 2). However, it is very difficult to form the outer surface and inner surface of a specific part of the light emitting portion into a spherical surface, and it is practically impossible to form a spherical surface centered on the arc center with both sides aligned. The light emitted from the light emitting part cannot be efficiently returned to the arc region, and if the light emitted from the light emitting part is returned into the light emitting part, the lamp temperature rises and causes a malfunction.
また、高圧放電ランプの発光部の形状を工夫することにより、電極間距離を狭めてアーク長を短くしなくとも、光学的に見掛けのアーク長を短くして点光源に近い発光が得られるようにする発明も提案されている（特許文献３参照）。この発明は、発光部の中央部の外表面に平坦部を形成して該平坦部から透かし見る電極間距離が実際よりも狭く見えるようにするものであるが、その平坦部を成す面と、その両端に連なる他面とが交わる境目で、外表面形状が急激に変化しているから、境目部分を透過する光がその境目で別方向に分かれるように屈折せられる。このため、当該発明に係る高圧放電ランプを設けた反射鏡付きランプは、その照射光に照度ムラを生ずるという問題がある。
ところで、プロジェクターやプロジェクションＴＶのバックライトとして用いる反射鏡付きランプは、その光が照射される被照射物に熱線による損傷を生じさせないようにするために、凹面反射鏡の基体が、石英や、ホウ珪酸ガラス等の硬質ガラス、結晶化ガラス等で形成されると共に、その反射面が、可視光を反射し、近赤外光を透過させて有害な熱線が反射される量を低減する誘電体多層膜で形成されたものが一般的であるが、反射面の反射特性は、図４のグラフに示すように、光の入射角度に大きく依存しており、入射角度が大きくなると、偏光作用によって反射率が低下し、反射光の色も変わってしまうという問題があった。 By the way, in a lamp with a reflector used as a backlight of a projector or projection TV, in order to prevent the irradiated object irradiated with the light from being damaged by heat rays, the substrate of the concave reflector is made of quartz or Dielectric multilayer that is formed of hard glass such as silicate glass, crystallized glass, etc., and its reflective surface reflects visible light and transmits near infrared light to reduce the amount of harmful heat rays reflected As shown in the graph of FIG. 4, the reflection characteristics of the reflecting surface are generally dependent on the incident angle of light. When the incident angle increases, the reflection characteristics are reflected by the polarization effect. There was a problem that the rate decreased and the color of the reflected light also changed.
つまり、図３に示す従来の反射鏡付きランプは、図５の部分拡大図の如く、高圧放電ランプ３０の発光部３２から放射されて凹面反射鏡３４の反射面３６で反射される光の入射角度θ１、θ２、θ３が、凹面反射鏡３４のボトム部３５側から開口部３７側に向かうに従って漸次大きくなる（θ１＜θ２＜θ３）ので、反射面３６は、凹面反射鏡３４の開口部３７側に向かうに従って可視光の反射率が低下し、その開口部３７側で反射する光の利用効率が悪いという問題があった。 That is, the conventional reflector-equipped lamp shown in FIG. 3 is incident with light radiated from the light emitting portion 32 of the high-pressure discharge lamp 30 and reflected by the reflecting surface 36 of the concave reflecting mirror 34, as shown in the partial enlarged view of FIG. Since the angles θ1, θ2, and θ3 gradually increase from the bottom 35 side of the concave reflecting mirror 34 toward the opening 37 (θ1 <θ2 <θ3), the reflecting surface 36 has the opening 37 of the concave reflecting mirror 34. There is a problem in that the reflectance of visible light decreases toward the side, and the utilization efficiency of light reflected on the opening 37 side is poor.
本発明は、反射鏡付きランプの光源となる高圧放電ランプの発光部から放射される光の利用効率を最大限に高めることを技術的課題とし、特に、凹面反射鏡の反射面による光の反射率を高めて、光の利用効率を大幅に向上させることができるようにすることを課題としている。 It is a technical object of the present invention to maximize the utilization efficiency of light emitted from a light emitting part of a high-pressure discharge lamp serving as a light source of a lamp with a reflector, and in particular, the reflection of light by the reflecting surface of a concave reflector. It is an object to increase the rate and greatly improve the light use efficiency.
上記課題を解決するために、本発明は、発光管の発光部に一対の電極が対向して配置された高圧放電ランプが、その電極軸を凹面反射鏡の光軸と同軸的に配して該反射鏡のボトム部に固定された反射鏡付きランプにおいて、前記発光部の肉厚が、前記電極間の発光点よりも前記凹面反射鏡のボトム部側に偏した部位で最大となるように、前記凹面反射鏡の開口部側からボトム部側にかけて漸増し、その肉厚が最大となる部位から前記凹面反射鏡のボトム部側に位置する発光部の端部にかけて漸減していることを特徴とする。
In order to solve the above-described problems, the present invention provides a high pressure discharge lamp in which a pair of electrodes are arranged opposite to a light emitting portion of an arc tube, the electrode axis of which is arranged coaxially with the optical axis of the concave reflector. In the reflector-equipped lamp fixed to the bottom portion of the reflecting mirror, the thickness of the light emitting portion is maximized at a portion that is biased toward the bottom portion of the concave reflecting mirror with respect to the light emitting point between the electrodes. The concave reflecting mirror gradually increases from the opening side to the bottom side, and gradually decreases from the portion where the wall thickness is maximum to the end of the light emitting unit located on the bottom side of the concave reflecting mirror. And
本発明によれば、高圧放電ランプの発光部から凹面反射鏡の開口部方向に放射される光がその発光部の外表面で凹面反射鏡のボトム部側に屈折するので、凹面反射鏡の開口部側の反射面で反射して被照射領域に照射される光の量が増大する。また、光の入射角度が小さくなる凹面反射鏡のボトム部側の反射面で反射される光の量が増大するので、反射率の低下による光損失が抑制されて、光の利用効率が著しく向上すると同時に、反射光の色が変わることも抑制される。 According to the present invention, the light radiated from the light emitting portion of the high pressure discharge lamp toward the opening of the concave reflecting mirror is refracted on the outer surface of the light emitting portion toward the bottom of the concave reflecting mirror. The amount of light reflected by the reflection surface on the part side and applied to the irradiated region increases. In addition, since the amount of light reflected by the reflecting surface on the bottom side of the concave reflecting mirror where the incident angle of light becomes small increases, light loss due to a decrease in reflectivity is suppressed, and light utilization efficiency is significantly improved. At the same time, changes in the color of the reflected light are also suppressed.
本発明に係る反射鏡付きランプの最良の実施形態は、発光管の発光部に一対のタングステン電極が対向して配置されると共に、水銀、ハロゲン及び始動用補助ガスが封入されたショートアークタイプの高圧放電ランプと、反射面が可視光を反射して近赤外光を透過する誘電体多層膜で形成された凹面反射鏡とで構成され、高圧放電ランプは、その電極軸を凹面反射鏡の光軸と同軸的に配して該反射鏡のボトム部に固定されている。 The best embodiment of the lamp with a reflector according to the present invention is a short arc type in which a pair of tungsten electrodes are arranged opposite to a light emitting portion of an arc tube, and mercury, a halogen and a starting auxiliary gas are enclosed. The high-pressure discharge lamp and a concave reflecting mirror formed of a dielectric multilayer film whose reflecting surface reflects visible light and transmits near-infrared light, and the electrode axis of the high-pressure discharge lamp is that of the concave reflecting mirror. It is coaxially arranged with the optical axis and is fixed to the bottom portion of the reflecting mirror.
そして、高圧放電ランプは、発光部の肉厚が、凹面反射鏡の開口部側からボトム部側にかけて漸増し、電極間の発光点よりも凹面反射鏡のボトム部側に偏した部位で最大となり、その部位から凹面反射鏡のボトム部側に位置する発光部の端部にかけて漸減している。これにより、発光部から凹面反射鏡の開口部方向に放射される光は、発光部の外表面で凹面反射鏡のボトム部側に屈折するので、凹面反射鏡の開口部から被照射領域に向かわない方向へ出射する光の量が減少し、凹面反射鏡の開口部側の反射面で反射して被照射領域に照射される光の量が増加する。また、発光部から反射面のない凹面反射鏡のボトム部に向かって放射される光が、発光部の外表面で凹面反射鏡の開口部側に屈折して、ボトム部周辺の反射面で反射される光の量が増加する。更に、光の入射角度が小さくなる凹面反射鏡のボトム部側の反射面で反射される光の量が増大するので、反射率の低下による光損失が低減して、光の利用効率が著しく向上する。 In the high-pressure discharge lamp, the thickness of the light emitting part gradually increases from the opening side of the concave reflecting mirror to the bottom part side, and becomes the maximum at the part that is biased toward the bottom part side of the concave reflecting mirror rather than the light emitting point between the electrodes. , And gradually decreases from that portion to the end of the light emitting part located on the bottom part side of the concave reflecting mirror. As a result, light emitted from the light emitting part toward the opening of the concave reflecting mirror is refracted on the outer surface of the light emitting part toward the bottom part of the concave reflecting mirror, so that the light is directed from the opening of the concave reflecting mirror toward the irradiated area. The amount of light emitted in a non-directional direction is reduced, and the amount of light reflected by the reflecting surface on the opening side of the concave reflecting mirror and irradiated on the irradiated region is increased. Also, light emitted from the light emitting part toward the bottom part of the concave reflecting mirror having no reflecting surface is refracted on the outer surface of the light emitting part toward the opening side of the concave reflecting mirror and reflected by the reflecting surface around the bottom part. The amount of light that is increased. Furthermore, since the amount of light reflected by the reflecting surface on the bottom side of the concave reflecting mirror that reduces the incident angle of light increases, light loss due to a decrease in reflectivity is reduced, and light utilization efficiency is significantly improved. To do.
また、高圧放電ランプは、発光部の肉厚が漸増する部位の外表面が、凹面反射鏡の開口部側からボトム部側に向かって直線状もしくは緩やかな弧状の上り勾配を成すテーパ形に形成され、発光部の内表面が、球形、楕円球形又は紡錘形に形成されている。これにより、テーパ形に形成された発光部の外表面側から一対の電極を透かし見ると、その電極間距離が実際よりも狭く見える凹レンズ効果を奏するから、光学的に見掛けのアーク長を短くした点光源に近い発光が得られる。つまり、肉厚漸増部位の外表面が、直線状の上り勾配を成すテーパ形であれば平凹レンズ、緩やかな弧状の上り勾配を成すテーパ形であれば凹メニカスレンズのようなレンズ効果を奏して、点光源に近い発光を得ることができる。 In addition, the high pressure discharge lamp is formed in a taper shape in which the outer surface of the portion where the thickness of the light emitting portion gradually increases forms a straight or gentle arc-shaped upward gradient from the opening side of the concave reflector to the bottom side. The inner surface of the light emitting part is formed in a spherical shape, an elliptical spherical shape, or a spindle shape. As a result, when the pair of electrodes is seen through from the outer surface side of the light emitting portion formed in a taper shape, the distance between the electrodes appears to be narrower than the actual lens, so the optically apparent arc length is shortened. Light emission close to a point light source can be obtained. That is, if the outer surface of the gradually increasing thickness portion is a taper shape that forms a linear upslope, a plano-concave lens, and if it is a taper shape that forms a gentle arc-like upslope, a lens effect such as a concave meniscus lens is achieved, Light emission close to a point light source can be obtained.
また、発光部の外表面には、テーパ形に形成された外表面と、その両端に連なる外表面ととを角を立てずに交わす平滑仕上げが施され、これによって、外面形状の急激な変化に起因する照度ムラを生ずることが防止されている。 In addition, the outer surface of the light emitting part is subjected to a smooth finish that intersects the outer surface formed in a tapered shape and the outer surfaces connected to both ends thereof without making a corner, thereby abrupt changes in the outer surface shape. It is possible to prevent illuminance unevenness caused by
図１は本発明に係る反射鏡付きランプの一例を示す断面図、図２はその部分拡大図であって、本例の反射鏡付きランプは、ショートアークタイプの高圧放電ランプ１と凹面反射鏡２とが一体化されている。 FIG. 1 is a sectional view showing an example of a lamp with a reflector according to the present invention, and FIG. 2 is a partially enlarged view thereof. The lamp with a reflector of this example includes a short arc type high-pressure discharge lamp 1 and a concave reflector. 2 is integrated.
高圧放電ランプ１は、石英ガラス管で成る発光管２の中央付近に最大内径４．４ｍｍ、内容積８０ｍｍ３の発光部３が形成され、該発光部３には、一対のタングステン電極４Ｒ、４Ｌが１．２ｍｍの電極間距離をあけて互いに対向するように配置されると共に、水銀が０．２ｍｇ／ｍｍ３、始動用補助ガスとしてアルゴンが約２０ｋＰａ（常温時）、黒化防止のための微量のハロゲンとして臭素が１．６×１０−４μmol／mm3封入されている。 High-pressure discharge lamp 1, the maximum internal diameter 4.4mm in the vicinity of the center of the light emitting tube 2 made of quartz glass tube, the light emitting portion 3 having an inner volume of 80 mm 3 is formed, the light emitting unit 3, a pair of tungsten electrodes 4R, 4L Are arranged so as to face each other with a distance of 1.2 mm between electrodes, mercury is 0.2 mg / mm 3 , argon is about 20 kPa (at room temperature) as an auxiliary gas for start-up, to prevent blackening As a trace amount of halogen, bromine is enclosed in 1.6 × 10 −4 μmol / mm 3 .
なお、各電極４Ｒ、４Ｌは、発光部３の両端を気密に封止する封止部５Ｒ、５Ｌに埋設されたモリブデン箔６Ｒ、６Ｌを介してリード棒７Ｒ、７Ｌに接続され、該リード棒７Ｒ、７Ｌに結線された電力供給用リード線８Ｒ、８Ｌを通じて点灯装置（図示せず）からランプ電力が供給されるようになっている。 The electrodes 4R and 4L are connected to the lead rods 7R and 7L via molybdenum foils 6R and 6L embedded in sealing portions 5R and 5L that hermetically seal both ends of the light emitting portion 3, respectively. Lamp power is supplied from a lighting device (not shown) through power supply leads 8R and 8L connected to 7R and 7L.
凹面反射鏡９は、その基体が石英や、ホウ珪酸ガラス等の硬質ガラス、結晶化ガラス等で形成され、回転放物面を成す反射面１０が、可視光を反射し、赤外光と紫外光を透過する特性を有する誘電体多層膜を蒸着して成るコールドミラーで形成されている。そして、高圧放電ランプ１が、発光部３の片端側を封止する封止部５Ｌを凹面反射鏡９のボトム部１１に挿通して耐熱性接着剤１２で固定することにより、電極軸を凹面反射鏡９の光軸Ｘと同軸的に配した状態でそのボトム部１１に固定されている。 The concave reflecting mirror 9 has a base made of quartz, hard glass such as borosilicate glass, crystallized glass, etc., and a reflecting surface 10 that forms a paraboloid of light reflects visible light, infrared light and ultraviolet light. It is formed of a cold mirror formed by vapor-depositing a dielectric multilayer film having a property of transmitting light. Then, the high pressure discharge lamp 1 inserts the sealing portion 5L that seals one end side of the light emitting portion 3 into the bottom portion 11 of the concave reflecting mirror 9, and fixes it with the heat resistant adhesive 12, thereby making the electrode shaft concave. It is fixed to the bottom part 11 in a state of being arranged coaxially with the optical axis X of the reflecting mirror 9.
また、高圧放電ランプ１は、発光部３の肉厚が、凹面反射鏡９の開口部１３側からボトム部１１側にかけて漸増し、電極４Ｒ、４Ｌ間の発光点Ａよりもボトム部１１側に偏した部位Ｂで最大となり、その肉厚最大部位Ｂからボトム部１１側に位置する発光部３の端部にかけて漸減する形状に加工されている。 Further, in the high pressure discharge lamp 1, the thickness of the light emitting portion 3 gradually increases from the opening 13 side to the bottom portion 11 side of the concave reflecting mirror 9, and is closer to the bottom portion 11 side than the light emitting point A between the electrodes 4R and 4L. It is processed into a shape that becomes maximum at the biased part B and gradually decreases from the thickest part B to the end of the light emitting part 3 located on the bottom part 11 side.
これにより、図２の如く、発光部３から放射される光を実線で示し、同図鎖線図示の従来の発光部３２から放射される光を破線で示して、両者の放射方向を対比すれば明らかなように、発光部３から放射される光は、その大半が凹面反射鏡９のボトム部１１側に屈折するので、凹面反射鏡９の開口部１３から被照射領域に向かわない方向へ出射する光の量が減少し、凹面反射鏡９の開口部１３側の反射面１０で反射して被照射領域に照射される光の量が増加すると共に、光の入射角度が小さくなる凹面反射鏡９のボトム部１１側の反射面１０で反射される光の量が増大して、反射率の低下による光損失が低減されるので、光の利用効率が著しく向上する。また、反射面１０のない凹面反射鏡９のボトム部１１に向かって放射される光が凹面反射鏡９の開口部１３側に屈折してボトム部１１周辺の反射面１０で反射される光の量が増加するので、光の利用効率が更に高まる。 Thus, as shown in FIG. 2, the light emitted from the light emitting unit 3 is indicated by a solid line, the light emitted from the conventional light emitting unit 32 shown by the chain line in the figure is indicated by a broken line, and the radiation directions of both are compared. As is apparent, most of the light emitted from the light emitting unit 3 is refracted toward the bottom part 11 side of the concave reflecting mirror 9, so that it is emitted from the opening 13 of the concave reflecting mirror 9 in a direction not toward the irradiated region. A concave reflecting mirror that reduces the amount of light that is reflected, increases the amount of light that is reflected by the reflecting surface 10 on the opening 13 side of the concave reflecting mirror 9 and irradiates the irradiated area, and decreases the incident angle of light. 9 increases the amount of light reflected by the reflecting surface 10 on the bottom portion 11 side, and light loss due to a decrease in reflectance is reduced, so that the light utilization efficiency is remarkably improved. Further, the light radiated toward the bottom portion 11 of the concave reflecting mirror 9 without the reflecting surface 10 is refracted toward the opening 13 side of the concave reflecting mirror 9 and reflected by the reflecting surface 10 around the bottom portion 11. Since the amount increases, the light utilization efficiency further increases.
また、高圧放電ランプ１は、発光部３の肉厚が漸増する部位Ｃの外表面が、凹面反射鏡９の開口部１３側からボトム部１１側に向かって直線状もしくは緩やかな弧状の上り勾配を成すテーパ形に形成され、発光部３の内表面が、発光点Ａを中心とする球形乃至楕円球形もしくは紡錘形に形成されている。これにより、肉厚漸増部位Ｃの断面形状は、凹レンズのように、外表面側が直線もしくは曲率の小さい緩やかな凸曲面を成し、内表面側が曲率の大きい凹曲面を成しているから、その肉厚漸増部位Ｃを通じて電極４Ｒ、４Ｌを透かし見ると、その電極間距離が実際よりも狭く見えて、見掛けのアーク長を短くした点光源に近い発光が得られる。 Further, in the high pressure discharge lamp 1, the outer surface of the portion C where the thickness of the light emitting portion 3 gradually increases is a straight or gentle arc-shaped upward gradient from the opening 13 side to the bottom portion 11 side of the concave reflecting mirror 9. The inner surface of the light emitting portion 3 is formed in a spherical shape, an elliptical spherical shape or a spindle shape with the light emitting point A as the center. As a result, the cross-sectional shape of the gradually increasing thickness portion C, like a concave lens, has a straight convex curve with a small curvature on the outer surface side and a concave curved surface with a large curvature on the inner surface side. When the electrodes 4R and 4L are viewed through the wall thickness increasing portion C, the distance between the electrodes appears to be narrower than actual, and light emission close to a point light source with a short apparent arc length can be obtained.
また、発光部３は、肉厚漸増部位Ｃのテーパ形に形成された外表面と、その両端に連なる外表面とを角を立てずに交わす平滑仕上げが施されると共に、肉厚漸増部位Ｃと肉厚最大部位Ｂの外表面や、肉厚最大部位Ｂと肉厚漸減部位Ｄの外表面も角を立てずに交わす平滑仕上げが施されて、外面形状の急激な変化に起因する照度ムラを生ずることが防止されている。 In addition, the light emitting unit 3 is provided with a smooth finish that intersects the outer surface formed in a tapered shape of the gradually increasing thickness portion C and the outer surfaces connected to both ends thereof without forming an angle, and the gradually increasing thickness portion C. And the outer surface of the maximum thickness part B and the outer surface of the maximum thickness part B and the gradually decreasing thickness part D are subjected to a smooth finish without making a corner, and uneven illuminance caused by a sudden change in the outer shape Is prevented.
なお、凹面反射鏡９の反射面１０は、可視光を反射し、赤外光と紫外光を透過する誘電体多層膜を蒸着して成るコールドミラーで形成されているが、これに限らず、アルミ反射膜等で形成されるものであってもよい。 The reflecting surface 10 of the concave reflecting mirror 9 is formed of a cold mirror formed by depositing a dielectric multilayer film that reflects visible light and transmits infrared light and ultraviolet light. It may be formed of an aluminum reflective film or the like.
本発明は、プロジェクターやプロジェクションＴＶのバックライトとして用いる反射鏡付きランプの光利用効率を高めてその性能向上に資するものである。 The present invention increases the light utilization efficiency of a lamp with a reflector used as a backlight of a projector or a projection TV, and contributes to the improvement of the performance.
１ 高圧放電ランプ
２ 発光管
３ 発光部
４Ｒ 電極
４Ｌ 電極
Ａ 発光点
Ｂ 肉厚最大部位
Ｃ 肉厚漸増部位
Ｄ 肉厚漸減部位
９ 凹面反射鏡
１０ 反射面
１１ ボトム部
１３ 開口部
DESCRIPTION OF SYMBOLS 1 High pressure discharge lamp 2 Light emission tube 3 Light emission part 4R electrode 4L electrode A Light emission point B Thickness maximum part C Thickness increase part D Thickness decrease part 9 Concave reflector 10 Reflective surface 11 Bottom part 13 Opening part
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005321147A JP4577187B2 (en) | 2005-11-04 | 2005-11-04 | Lamp with reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005321147A JP4577187B2 (en) | 2005-11-04 | 2005-11-04 | Lamp with reflector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007128771A JP2007128771A (en) | 2007-05-24 |
| JP4577187B2 true JP4577187B2 (en) | 2010-11-10 |
Family
ID=38151250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005321147A Expired - Fee Related JP4577187B2 (en) | 2005-11-04 | 2005-11-04 | Lamp with reflector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4577187B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11149901A (en) * | 1997-11-18 | 1999-06-02 | Canon Inc | Arc tube and light source apparatus using it |
-
2005
- 2005-11-04 JP JP2005321147A patent/JP4577187B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11149901A (en) * | 1997-11-18 | 1999-06-02 | Canon Inc | Arc tube and light source apparatus using it |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007128771A (en) | 2007-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101038450B1 (en) | Illumination unit | |
| US7252410B2 (en) | Projector | |
| JPH02148603A (en) | Head lamp for vehicle | |
| JP4535384B2 (en) | Automotive discharge bulbs and automotive headlamps | |
| JP4577187B2 (en) | Lamp with reflector | |
| WO2011108627A1 (en) | Light source device | |
| US20070279916A1 (en) | Light source device | |
| JP2010060855A (en) | Optical apparatus | |
| JP2011222217A (en) | Optical apparatus | |
| JP4609224B2 (en) | Light source device | |
| JP4492307B2 (en) | Light source device | |
| JPH097553A (en) | Incandescent lamp and lighting device using it | |
| JP2006202668A (en) | Fluorescent lamp, fluorescent lamp device and luminaire | |
| JP4613877B2 (en) | Lamp with reflector | |
| KR20050007415A (en) | High-pressure gas discharge lamp | |
| JPH113688A (en) | Reflection type tubular lamp and lighting system | |
| JP4356493B2 (en) | Short arc type high pressure mercury lamp and light source unit | |
| JP4231431B2 (en) | Halogen bulb with infrared reflective film and halogen bulb with reflective mirror / infrared reflective film | |
| CN105374659B (en) | Short arc discharge lamp and light supply apparatus | |
| JP2006120358A (en) | Light source device and projector | |
| JP2009081095A (en) | Backlight | |
| JP2002075271A (en) | Illumination device | |
| JP2004227983A (en) | Ultrahigh-pressure mercury lamp | |
| JP2004063222A (en) | High-pressure discharge lamp, light source unit, and projector | |
| JP2008152998A (en) | Lamp with reflector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20081031 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20100521 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20100608 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20100707 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20100727 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20100809 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130903 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| LAPS | Cancellation because of no payment of annual fees |