JP4861583B2 - High pressure metal vapor discharge lamp and lighting fixture - Google Patents

Description

表１から明らかなように、中空管６（＝発光管４）の中心付近にグロースタータ８１を配置（Ａ…Ｓ／Ｄが０％）すると紫外線照射の作用が大きくランプの始動特性が良好であった。また、中空管６（＝発光管４）の中心から離れるにしたがい（Ｓ／Ｄが大きくなるにしたがい）始動特性が低下した。さらに、グロースタータ８１の向きは中空管６（＝発光管４）と同軸の鉛直が最も良く、傾斜状態から水平状態になるにしたがい始動特性が低下する傾向にあった。
【００９０】
なお、本発明では、始動時に紫外線放射始動素子８１から発光管４に向けて多量の紫外線が照射されるよう両者間は空間であるのが望ましい。また、付近に配設されたサポート部材７ａ，７ｂや給電線７４，７５あるいは点灯回路構成部品などが反射体として作用して、紫外線放射始動素子８１からの紫外線を発光管４に照射するため、紫外線放射始動素子８１は各サポート部材７ａ，７ｂ、給電線７４，７５や点灯回路構成部品などの間に配設されるのがより好ましい。
【００９１】
また、図５は本発明に係わる高圧金属蒸気放電ランプＬを装着したスポーツ施設照明用などの高天井用の照明器具９の実施の形態の概略を示す縦断面図である。
【００９２】
この図３において照明器具９は、天井面などへの取付部をなす基台９１にソケット９２が取着されているとともにこのソケット９２を囲みガード９３が設けられている。そして、このガード９３の下端には金属板やほうろう製の円錐状をし内面に反射面が形成された反射笠９４が固定され、上記ソケット９２に放電ランプＬの口金３が装着されることにより保持と電気的な接続がなされる。
【００９３】
なお、この実施の形態では上記基台９１、ガード９３および反射笠９４などで器具本体を構成している。また、ランプの点灯回路装置８９および電源スイッチ（図示しない。）は器具本体とは別の所に設けられている。
【００９４】
このような照明器具９は、たとえばスポーツ施設の天井面に反射笠９４の開口部側を下方に向けて取付けられ、電源スイッチを入れることにより電源８８から点灯回路装置８９、ソケットを介して放電ランプＬに通電される。
【００９５】
そして、この反射笠９４内で口金３側を上方（ベースアップ）にした垂直状態にあるランプＬが点灯されると、ランプＬからの可視光は反射面で反射され、あるいは直接に開口部を透過して、被照射物であるコートやグランド面を照射して所定の照度が得られる。
【００９６】
したがって、上記高圧金属蒸気放電ランプＬを用いた本発明の実施の形態に係わる照明器具９は、ランプＬに対応して始動特性の向上がはかられるとともに安全性が向上できるので、器具の開口部に強化ガラスや金網などからなる飛散防止用の保護カバー部材などの配設を省くことが可能な照明器具を提供できる。
【００９７】
なお、本発明は上記実施の形態に限るものではない。たとえば中空管のサポート部材への取り付けは、起立片を形成したリング状の金属板に限らず、中空管の端部に軸方向に切込みを設け、この切込みを発光管を固定するバンド部材に装着するなどの手段で行うようにしてもよい。
【００９８】
また、発光管および中空管を支持するサポート部材は、上下分離した一対のサポート部材で光電子作用を回避するため電位のかからない構成としたが、ハロゲン化ナトリウムを封入しない発光管などにおいては電極への給電部材として用いられてサポート部材に電位がかかるものであってもよく、また、上下が導電部材などで一体的に接続されたサポート部材であってもよい。
【００９９】
また、本発明に係わる照明器具は、放電ランプを鉛直状態で点灯するものに限らず、水平や傾斜状態で点灯する器具にももちろん適用できる。
【０１００】
【発明の効果】
請求項１の発明によれば、紫外線放射始動素子の配設を紫外線透過が最も多い側が中空管の仮想延長線内で発光管と同軸方向とすることにより、紫外線が発光管を効率よく照射して放電ランプの始動を容易に、かつ、確実に行わせ始動に要する時間を短縮できる高圧金属蒸気放電ランプを提供できる。
【０１０１】
また、本発明では、万一、発光管バルブが破損しガラス片などが飛散しても、発光管を囲繞して設けた中空管がこれを阻止ないしは衝撃を緩和して外管バルブに及ぼす応力を低減して、外管バルブの破損を防止して安全上も大いに寄与できる。
【０１０２】
さらに、中空管により放熱が遮蔽されるため、発光管バルブの温度が全体的に上昇し、最冷部をなすバルブ内端部の電極の根元部をも昇温するので、バルブ内に封入した発光金属を加熱して蒸気圧を高め発光効率や演色性などの発光特性の向上がはかれるなど種々の利点を有する高圧金属蒸気放電ランプを提供できる。
【０１０３】
請求項２の発明によれば、バルブの内部に水銀を封入したグロースタータ（点灯管）またはエンハンサを紫外線放射始動素子として用いることにより、有効な紫外線放射を行わせることができる。
【０１０４】
請求項３の発明によれば、中空管が長いほど発光管バルブ破裂の際のガラス片などの飛散を防ぐことができるが、最低でも発光管の内端部間を覆っていればよい。また、バルブの最冷部を形成する内端部が保温されることにより発光特性の向上がはかれるなど所定の効果を奏することができる。
【０１０５】
請求項４の発明によれば、放電媒体としてハロゲン化物が封入されている発光管を有する放電ランプに適用して、上記請求項１ないし３に記載したと同様な効果を奏する高圧金属蒸気放電ランプを提供できる。
【０１０６】
また、発光管と中空管を電位のかからないサポート部材に支持させることにより、点灯時に光電子作用によって発光管バルブ内からナトリウムイオンなどが抜け出すことを防止でき、放電ランプが発光効率の低下を来したり、ランプ電圧を上昇させて短寿命になるなどのことを防止した高圧金属蒸気放電ランプを提供できる。
【０１０７】
請求項５の発明によれば、上記請求項１ないし４に記載の効果を有する高圧放電ランプを組み込んでいるので、発光特性の向上がはかれるとともに、万一、発光管バルブが破損してもガラス片を飛散させることがない安全性の高い照明器具を提供できる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る高圧金属蒸気放電ランプの概略を示す正面図である。
【図２】図１に示す高圧金属蒸気放電ランプの点灯回路の回路図である。
【図３】図１に示す高圧金属蒸気放電ランプにおける、中空管に対するグロースタータの配設位置を概略的に示す説明図である。
【図４】中空管を延長した仮想線の外側表面側から、グロースタータを徐々に離していった場合の始動に要する時間について調べたグラフである。
【図５】本発明の実施の形態に係る高圧金属蒸気放電ランプを装着したスポーツ施設照明用などの高天井用の照明器具の概略を示す正面図である。
【符号の説明】
Ｌ：高圧金属蒸気放電ランプ（メタルハライドランプ）
１：外管バルブ
４：発光管
４０：発光管バルブ
４ａ，４ｂ：封止部
５ａ，５ｂ：電極（主電極）
６：透光性中空管
７ａ，７ｂ：サポート部材
８１：グロースタータ（紫外線放射始動素子）
９：照明器具[0001]
BACKGROUND OF THE INVENTION
The present invention provides a high-pressure metal vapor in which an arc tube and a translucent hollow tube surrounding the arc tube are supported by a support member in an outer tube bulb, and an ultraviolet radiation starting element for starting is provided on the support member. The present invention relates to a discharge lamp and a lighting fixture using the discharge lamp.
[0002]
[Prior art]
In order to obtain high efficiency and high color rendering, the high-pressure metal vapor discharge lamp is made smaller in the arc tube to increase the temperature and prevent oxidation of the support member. It has a double tube structure in which the arc tube is sealed.
[0003]
In such a high-pressure metal vapor discharge lamp, for example, a metal halide lamp has a halide enclosed in the arc tube, so that initial electrons are insufficient due to the electron adsorption action by the halogen, and the starting characteristics may be poor.
[0004]
Therefore, it is considered as an effective means to increase the initial electrons as a countermeasure. For example, in Japanese Examined Patent Publication No. 60-34223, a radioactive substance such as promethium Pm147 or krypton Kr85 is enclosed in the arc tube, and the starting is started. Techniques have been disclosed that facilitate electron emission between electrodes at times.
[0005]
However, encapsulating a radioactive substance inside the arc tube requires strict management for handling and storage of the radioactive substance in the production of the arc tube, and in recent years, a means for assisting starting to replace such a radioactive substance. Is desired.
[0006]
Therefore, as another means for assisting starting, Japanese Patent Application Laid-Open No. 1-134848, Japanese Patent Application Laid-Open No. 1-134849, and Japanese Patent Publication No. 7-7662 irradiate the arc tube such as a metal halide lamp with ultraviolet rays at the time of starting. High-pressure pulse or ultraviolet light with a starter element or glow starter (lighting tube) Line A high pressure metal vapor discharge lamp for use is disclosed.
[0007]
The former high-pressure metal vapor discharge lamp by ultraviolet irradiation has a high pulse voltage supplied from a ballast when the discharge lamp is turned on, and a pair of electrodes of an arc tube and an internal conductive member and an external conductive member that the ultraviolet radiation starting element has. Are applied to each other and discharged within the bulb of the ultraviolet radiation starting element to generate ultraviolet rays. By irradiating the ultraviolet rays toward the inside of the arc tube, electrons are emitted from the surface of the electrode, and the number of initial electrons increases, and the inside of the arc tube In this case, the electric discharge is likely to occur and the starting is performed.
[0008]
The latter glow starter (lighting tube) is filled with argon gas or mercury in a bulb to form an ultraviolet radiation starting element, and ultraviolet rays generated from argon gas or mercury by glow discharge of the glow starter are irradiated toward the electrodes. As a result, the number of initial electrons is increased, and the discharge lamp is started by generating a high-pressure pulse from the ballast when the bimetal is opened on the same principle as the glow starter of the fluorescent lamp.
[0009]
Moreover, this high-pressure metal vapor discharge lamp has a pressure in the arc tube at the time of lighting of about 100 kPa to 500 kPa, depending on the lamp power and size as the name suggests. When the internal pressure increases due to abnormal current or the like due to deterioration or malfunction of the lighting circuit, the arc tube bulb may burst due to failure to withstand the pressure.
[0010]
If this arc tube bulb ruptures, the glass pieces of the bulb forming the arc tube will scatter and collide with the outer bulb, and the outer bulb will also be damaged and scatter these glass pieces outside the instrument. In some cases, the debris hurts a person who is below, or hits a product, product, device, or the like below.
[0011]
Therefore, as a countermeasure, in the lighting fixture for lighting the discharge lamp, a protective cover member made of translucent tempered glass or a wire mesh is provided at the opening of the fixture, and the protective cover is provided when the lamp bursts. Protective measures were taken so that the glass piece received by the member did not fall off the instrument.
[0012]
However, providing a protective cover member at the opening of this instrument may cause unwanted light reflection, light absorption, light shielding, etc., or the cover member may become dirty and reduce visible light transmittance over time, This is a factor that lowers the luminous efficiency of the fixture, and cleaning this dirt has been very troublesome in the case of a lighting fixture at a high place.
[0013]
Further, as a countermeasure on the discharge lamp side, an anti-reflection coating is formed on the outer surface of the outer bulb with a material such as a translucent resin so that glass fragments are not scattered and dropped.
[0014]
Even if the outer tube bulb is broken by the formation of this anti-reflection coating, the glass piece can be prevented from scattering by the coating, but it is a fluororesin material having the highest allowable heat-resistant temperature of the anti-reflection coating and is about 260 ° C. There were restrictions on application depending on the type of output and output.
[0015]
Therefore, as another countermeasure, for example, as described in JP-A-5-121047, JP-A-6-295708, JP-A-11-288696, etc., an arc tube is surrounded by an arc tube bulb. A heat-resistant translucent hollow tube made of the same material as this is interposed, and even if the arc tube bulb breaks and scatters, it collides with this hollow tube, and the scattering energy is weakened so that glass fragments etc. It is known and used in many cases that it is known that it can prevent the direct flight of the outer tube valve to mitigate the impact and prevent the outer tube valve from being damaged.
[0016]
[Problems to be solved by the invention]
As described above, the arc tube is surrounded by a heat-resistant and light-transmitting hollow tube, and the arc tube and the ultraviolet radiation starting element are provided together. The high-pressure metal vapor discharge lamp to be operated has an advantage that the structure is simple and only one lighting circuit device is required and the economy is high.
[0017]
However, conventionally, in this type of discharge lamp, the starting circuit member including the ultraviolet radiation starting element has been given priority to simplification of connection between members and thermal influence, and the arrangement position and the directionality thereof have been considered. There wasn't. In particular, in the case of a glow starter (lighting tube), there is a case in which an emitter that has come to an almost fixed position on the inner surface of each bulb is deposited during aging and shields the transmission of ultraviolet rays.
[0018]
Therefore, even when an ultraviolet radiation starting element is provided, if the applied pulse voltage is low, the generated energy is small, and the amount of ultraviolet radiation from the ultraviolet radiation starting element is reduced, thereby assisting the starting of the arc tube. In some cases, lighting was difficult.
[0019]
The present invention has been made in view of the above circumstances, in a high-pressure discharge lamp that surrounds the arc tube and is provided with a heat-resistant translucent hollow tube and uses an ultraviolet radiation starting element as a starting aid, and is easy to start and An object of the present invention is to provide a high-pressure metal vapor discharge lamp and a lighting fixture that can be reliably turned on.
[0020]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a high-pressure metal vapor discharge lamp comprising: a light-emitting tube in which at least a pair of electrodes are provided in a light-emitting tube bulb comprising a heat-resistant and light-transmitting hermetic vessel; A cylindrical hollow tube made of a heat-resistant translucent member, a pair of support members that support both ends of the arc tube and the hollow tube, and a virtual extension line on the outer surface of the hollow tube In the coaxial direction of the arc tube The side with the most UV transmission A starting circuit component that includes a starting element that emits ultraviolet rays having a wavelength of at least 200 nm to 460 nm, and is electrically connected to the electrode and the starting circuit component And an outer tube bulb in an inert gas or nitrogen gas or a vacuum atmosphere containing a pair of support members for supporting the arc tube, the hollow tube and the starting circuit component. Features.
[0021]
The starter auxiliary circuit connected in parallel with the upper and lower main electrodes of the arc tube is energized at the same time as the electrodes are energized, and a glow starter (lighting tube) that generates ultraviolet rays connected as a starter is a glow starter for a fluorescent lamp. The high-pressure pulse is generated from the ballast when the bimetal is opened according to the same principle as above, and ultraviolet rays generated from argon gas and mercury by the glow discharge of the glow starter (lighting tube) irradiate the arc tube to increase the initial number of electrons. Thus, the discharge lamp can be easily started.
[0022]
In the present invention, the position of the ultraviolet radiation starting element such as a glow starter (lighting tube) that generates ultraviolet rays is within the virtual extension line of the outer surface of the hollow tube, and is in the coaxial direction of the arc tube. The side with the most UV transmission It was possible to increase the certainty of starting by providing it so that a space was formed between it and the arc tube.
[0023]
Further, in the present invention, since the heat radiation is shielded by the hollow tube arranged close to and surrounding the arc tube, the temperature of the arc tube bulb rises as a whole, and the inner end of the bulb that forms the coldest part Since the temperature of the base portion of the electrode is also raised, the light emitting metal sealed in the bulb can be heated to increase the vapor pressure and to improve the light emission efficiency and color rendering.
[0024]
In the unlikely event that the arc tube bulb breaks and glass fragments scatter, the hollow tube prevents this or reduces the impact and reduces the stress on the outer bulb, thereby damaging the outer bulb. This can greatly contribute to safety.
[0025]
In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.
[0026]
The high-pressure metal vapor discharge lamp to which the present invention can be applied has, for example, a multi-tube structure such as a double tube in which an arc tube is sealed in an outer bulb in a metal halide lamp, a short arc metal halide lamp, a high-pressure mercury lamp, or the like. .
[0027]
Materials for forming arc tube bulbs of hermetic containers include heat-resistant translucent high silica glass mainly composed of silicon oxide such as quartz glass, borosilicate glass and aluminosilicate glass, or alumina, yttria, magnesia, ruby and sapphire. By using a translucent ceramic made of the above, light emitting characteristics, heat resistance, corrosion resistance, electrical insulation and the like can be satisfied.
[0028]
The arc tube bulb is composed of a single shape such as a cylindrical shape, an oval shape, a spherical shape, or a composite shape. The form of the sealing part formed at the end of the arc tube bulb is crushing sealing or shrink (baking drawing) sealing in the case of glass, and sealing with a disk or cap in the case of ceramic. Can do. In addition, the introduction conductor sealed in the sealing portion of the arc tube bulb is not limited to the metal foil, and may be a metal wire.
[0029]
In addition, the electrodes provided in the arc tube are at least a pair, and the presence or absence of an auxiliary electrode is not questioned. Further, as the discharge medium sealed in the arc tube bulb, mercury, a halide of a luminescent metal, a rare gas, or the like is appropriately selected and used depending on the application or characteristics.
[0030]
The light-transmitting hollow tube can be made of a heat-resistant and light-transmitting material similar to that of the arc tube bulb, and the shape thereof is cylindrical. The thickness of the hollow tube is in the range of about 1.0 to 3.0 mm, and the hollow tube may be a double tube.
[0031]
As a means for increasing the strength of the hollow tube, it is possible to cope by winding a linear or mesh reinforcing body made of inorganic fibers such as heat-resistant ceramics around the outer periphery of the hollow tube. Also, a phosphor film, a light diffusion film, a coating film such as a blocking film that reflects or absorbs ultraviolet rays, or an uneven surface for light diffusion may be formed on the surface of the hollow tube.
[0032]
In addition, a pair of support members made of metal members that support both ends of the arc tube and the hollow tube that surrounds the arc tube are used as power feeding members to the electrodes in the arc tube and emit light even when a potential is applied. The structure which does not apply the electric potential electrically isolated from the tube valve or the electrode may be used.
[0033]
That is, in a metal halide lamp in which sodium halide is sealed, there is a possibility that a photoelectron action that sodium ions are attracted to a support member made of a conductive material disposed in the vicinity of the arc tube during lighting may be exerted.
[0034]
For this reason, since an arc tube bulb made of high silica glass (quartz glass) usually has a larger interstitial distance of silicon oxide constituting the quartz glass than sodium ions in the arc tube, positively charged sodium ions emit the above-mentioned light emission. It is attracted to the potential of the negative photoelectron on the outer surface of the tube and passes through the arc tube bulb and disappears outside the arc tube.
[0035]
For this reason, since the amount of sodium in the arc tube is reduced, the luminous efficiency of the lamp is lowered and excessive free halogen is increased in the arc tube, so that the lamp voltage is increased and the life is shortened.
[0036]
Therefore, when attaching the arc tube to the support member, the sealing portion made of an electrically insulating material is sandwiched and fixed by the band-shaped band member. In addition, the hollow tube is attached to the support member by holding the standing plates on both ends with holding plates provided with standing pieces at a plurality of locations on a ring-shaped metal plate substantially the same shape as the end surface of the hollow tube. The end of the hollow tube is held from the outside or sandwiched from both sides of the inner and outer surfaces, and a part of the standing piece is fixed to the support member or band member by welding or other means. Cuts in the axial direction may be provided in opposite portions of the parts, and the pair of cuts may be locked by means such as mounting on a band member that fixes the arc tube.
[0037]
In addition, the starting element that constitutes the ultraviolet radiation source is composed of a glow starter (lighting tube), an enhancer, etc., and a hard glass such as quartz glass or borosilicate glass that transmits at least a part of the wavelength of 200 nm to 460 nm, ultraviolet light An ultraviolet ray permeable bulb such as permeable soft glass or ceramic is used, and a discharge medium such as argon gas or argon gas and mercury and an internal conductive member are sealed in the bulb, and ultraviolet rays are emitted during glow discharge. Release.
[0038]
As the internal conductive member of the enhancer, a metal such as molybdenum or tungsten having electrical conductivity and heat resistance, or tantalum having a getter function for absorbing an impurity gas inside can be used. In addition, the shape and form of the conductive member can be rod-like, foil-like, coil-like, etc., and even if it is connected to the lead-in that penetrates the sealing part or has no lead-in, it is dielectrically connected to the outside of the container It may be done.
[0039]
The external conductive member is a wire or foil made of a metal such as iron-nickel alloy, iron-nickel-chromium alloy, nickel, copper or niobium, and is installed around the outer peripheral surface of the bulb of the ultraviolet radiation source. And capacitively coupled to the internal conductive member.
[0040]
The outer bulb is made of hard glass such as quartz glass, borosilicate glass or aluminosilicate glass, or soft glass such as soda lime glass, and the shape is A, A, AP, B, BT or ED. It is formed into a shape.
[0041]
The inside of the outer tube is an inert gas or nitrogen gas atmosphere or a vacuum atmosphere. In other words, inert gas or nitrogen gas is enclosed in the outer tube bulb at a low pressure or in a vacuum atmosphere to prevent oxidation of the arc tube component, support member, and stem component that become high temperature during lighting, and The restart time can be shortened, and it is possible to prevent rupture when the outer tube valve is damaged.
[0042]
Further, the lighting posture of the discharge lamp may be an inclined posture as well as horizontal and vertical.
[0043]
The present invention of In the high-pressure metal vapor discharge lamp, at least a part of the starting element that emits ultraviolet rays is in a virtual extension line of the outer surface of the hollow tube.
[0044]
It is most preferable that the center axis of the hollow tube (= arc tube) and the center of the ultraviolet radiation starting element coincide with each other, but it is most preferable for the irradiation of ultraviolet rays, but the outer peripheral surface of the cylindrical hollow tube is on the support member side. If arranged so that at least a part of the ultraviolet radiation starting element exists inside the extended imaginary line, a predetermined ultraviolet ray is emitted toward the arc tube, Increase certainty of starting Play an effect Can be .
[0045]
Claims of the invention 2 The high-pressure metal vapor discharge lamp described in 1) is characterized in that the starting element that emits ultraviolet rays is a glow starter or an enhancer.
[0046]
A glow starter (lighting tube) or enhancer in which mercury is sealed inside the bulb is optimal as a starting element by emitting ultraviolet rays when energized.
[0047]
Claims of the invention 3 The high-pressure metal vapor discharge lamp described in 1) is characterized in that the hollow tube has a length that covers at least the inner end portion of the arc tube bulb.
[0048]
The longer the hollow tube is, the more it can be prevented from scattering glass pieces or the like when the arc tube bulb is ruptured. However, it is sufficient that at least the inner end portion of the arc tube is covered. In addition, the inner end portion that forms the coldest portion of the valve is kept warm, thereby providing a predetermined action.
[0049]
Claims of the invention 4 The high-pressure metal vapor discharge lamp described in 1 is characterized in that a halide is enclosed as a discharge medium.
[0050]
By supporting both ends of the arc tube and the hollow tube with separate support members that do not apply electric potential, there is no electric potential applied in the vicinity, so sodium halide enclosed in the arc tube is caused by photoelectron action. It can be prevented from coming out.
[0051]
Claims of the invention 5 The lighting fixture according to claim 1 is a fixture main body, and the above-mentioned claim 1 to which it is arranged in this fixture main body. 4 The high-pressure metal vapor discharge lamp according to any one of the above, and a lighting circuit device connected to the high-pressure metal vapor discharge lamp.
[0052]
Claims 1 to 4 Incorporates a high-pressure metal vapor discharge lamp that does not cause a decrease in luminous efficiency or an increase in lamp voltage as described in 1. It is possible to provide a highly safe lighting apparatus that does not scatter the light.
[0053]
Even if this lighting fixture is provided with the lighting circuit device in the fixture, the lighting circuit device may be provided outside the fixture and connected to the lamp.
[0054]
This lighting apparatus can exhibit high light emission characteristics for lighting in stores, halls, underground shopping areas, offices, sports facilities, and the like.
[0055]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an outline of a metal halide lamp as a high-pressure metal vapor discharge lamp according to the present invention.
[0056]
In the metal halide lamp L shown in FIG. 1, the arc tube 4 and the arc tube 4 are surrounded by a pair of support members 7 a and 7 b disposed on the upper and lower sides of the outer bulb 1 having a stem 2 sealed at one end. The end portion of the translucent hollow tube 6 is supported.
[0057]
More specifically, the outer bulb 1 is made of translucent hard glass such as borosilicate glass, and has a bulging portion 11 at the center and a closed top portion 12 and upper portion on the lower side in the figure. The neck portion 13 is formed in a so-called BT shape having a small diameter portion. The neck portion 13 has a sealing portion (not shown) in which the stem 2 is sealed, and an E-shaped base 3 is attached to cover the sealing portion.
[0058]
The arc tube 4 sealed in the outer tube bulb 1 has crushing sealing portions 4a and 4a at both ends of the arc tube bulb 40 made of a straight tube (T) type quartz glass forming a light-transmitting airtight container. A pair of main electrodes 5a, 5b made of tungsten W or molybdenum Mo and an auxiliary electrode 5s are provided in the vicinity of one main electrode 5a.
[0059]
In the crushing sealing portions 4a, 4b, a metal foil 41,... Made of ribbon-like molybdenum Mo is sealed in an airtight manner. However, external lead wires 42, 42 and 42s made of molybdenum Mo wire or the like are connected to the outside of the valve 40 by means such as welding or caulking.
[0060]
In addition, a predetermined amount of mercury, a metal halide, and an inert gas such as argon gas are sealed in the arc tube bulb 40 as a discharge medium. As the metal halide, halogen such as iodine I or bromine Br and at least one light emitting metal such as sodium Na, scandium Sc, cesium Cs or dysprosium Dy are encapsulated, and luminous efficiency, color rendering properties and color We are trying to improve characteristics such as temperature.
[0061]
The translucent hollow tube 6 is formed in a cylindrical shape having upper and lower ends made of quartz glass and is disposed at a predetermined interval from the inner light emitting tube 4.
[0062]
The support member 7a on the neck portion 13 side is fixed to the band member 72 wound around the glass tube 23 of the stem 2 by means such as fastening, or separate from the lead wires 21 and 22 planted on the stem 2. It may be fixedly supported on a support line having no external lead-in line.
[0063]
The arc tube 4 and the hollow tube 6 in the outer tube bulb 1 are supported by wires 7 such as molybdenum Mo and stainless steel disposed on the top portion 12 and the neck portion 13 side of the outer tube bulb 1. The sealing portions 4a and 4b are positioned in the openings of the support members 7a and 7b formed in a substantially U shape, and the sealing portions 4a and 4b are sandwiched and welded by the band members 71 and 71 made of a band-shaped metal plate. The arc tube 4 is fixed by connecting by such means.
[0064]
Further, the hollow tube 6 is punched into a ring shape substantially the same shape as the end surface of the hollow tube 6 and the holding plates 60 provided with standing pieces 61,... The end of the hollow tube 6 is suppressed from the outside or sandwiched from both sides of the inner and outer surfaces, and some standing pieces 61,... Are connected to the support members 7a, 7b and the band members 71, 71 by means such as welding. It is fixed by.
[0065]
In this case, the arc tube 4 and the hollow tube 6 are not completely supported, and metal blade-like elastic (spring) members 73 and 73 are provided on the side surfaces of the support members 7a and 7b. The members 73 and 73 may be only on the support member 7b side on the top portion 12 side.) The elastic (spring) members 73 and 73 elastically contact the inner peripheral surfaces of the top portion 12 and the neck portion 13 of the valve 1. In addition, the arc tube 4 itself is supported so as to be on the central axis of the outer bulb 1 by acting as a main column. Reference numerals 77,... Are bridge members made of an electrical insulator that bridges and reinforces the support wires 7 and the feeder wires 74, 75.
[0066]
The electrical connection in the outer pipe valve 1 has a circuit configuration shown in FIG. That is, one introduction line 21 of the stem 2 is connected to one main electrode 5a via the feeder line 74 and the external introduction line 42, and the other introduction line 22 of the stem 2 is curved and separated so as to be away from the arc tube bulb 40. It is connected to the other main electrode 5b through the feeder line 75 made of a thin wire and the external lead-in line 42. Further, a starting auxiliary circuit is connected in parallel with the upper and lower main electrodes 5a, 5b of the arc tube 4.
[0067]
This starting auxiliary circuit has a glow starter (lighting tube) 81 for starting, a thermal responsive switch 82 using a bimetal, and a resistor 83 connected in series, and a current limiting resistance is connected from the connection between the glow starter 81 and the thermal responsive switch 82. 84 and connected to the auxiliary electrode 5s. In the figure, 88 is an AC power source, 89 is a ballast, etc., and these components constitute a lighting circuit device. Further, the dotted line is a part sealed in the outer bulb 1 of the discharge lamp L.
[0068]
The glow starter (lighting tube) 81 functions as an ultraviolet radiation starting element, and the structure thereof is formed, for example, by forming a sealing portion in which a lead wire is hermetically sealed at one end of a bulb made of quartz glass. A discharge electrode made of bimetal connected to a lead wire is opposed to the lead wire with a predetermined interval, and a predetermined amount of argon Ar is sealed. The glow starter 81 glows between the bimetal and the discharge electrode when energized, and emits ultraviolet rays generated from argon gas by the glow discharge of the glow starter 81.
[0069]
In the present invention, there is ultraviolet radiation. Glow starter 81 The light emitting tube 4 is attached to the feeder lines 74, 75 and the like so as to face the sealing portion side of the bulb, which is substantially coaxial with the central axis of the arc tube 4 and has the most ultraviolet ray transmission as the ultraviolet radiation starting element.
[0070]
That is, in the glow starter 81, the emitter material formed on the discharge electrode is scattered during aging, and a large amount of the emitter material is deposited on a specific portion of the bulb inner surface, in this case, the top (top) side of the bulb. Since it is opaque and radiation of ultraviolet rays is inhibited, the sealing portion side is directed to the arc tube 4.
[0071]
In this embodiment, the arc tube 4 and the hollow tube 6 are supported by the support members 7a and 7b. However, the support members 7a and 7b are independent of each other and are not electrically connected at all. Thus, the electrical connection to the main electrodes 5a, 5b, 5s in the arc tube 4 is performed by another power supply member such as the power supply lines 74, 75 from the introduction lines 21, 22 of the stem 2.
[0072]
The high-pressure metal vapor discharge lamp L shown in FIG. 1 is lit in a vertical, horizontal or inclined state as a double-halved metal halide lamp L in which the arc tube 4 is housed in the BT type outer tube bulb 1. .
[0073]
The metal halide lamp L is attached to the socket, and is energized from the power source 88 through the lighting circuit device 89 having a ballast or the like. The discharge lamp L connected to the lighting circuit device 89 is in the arc tube 4 through lead wires 21 and 22 and feed lines 74 and 75 electrically connected to a terminal portion (not shown) of the base 3 at the start. A high-voltage pulse is applied across the glow starter 81 connected in parallel to the main electrode 5a, the main electrode 5b, the auxiliary electrode 5s, and the feeder lines 74 and 75.
[0074]
By applying this high voltage pulse, discharge occurs between the discharge electrodes made of bimetal in the glow starter 81 having the smallest distance and resistance and the lowest impedance, and ultraviolet rays are emitted from the almost transparent sealing portion side of the glow starter 81 to emit light. The main electrode 5a and the auxiliary electrode 5s at one end of the tube 4 are irradiated with ultraviolet rays.
[0075]
When the bimetal in the glow starter 81 comes into contact with the discharge electrode due to thermal response due to the discharge, the discharge stops and a voltage is applied to the auxiliary electrode 5s, and the auxiliary electrode 5s and the main electrode which are in close proximity with the action of the ultraviolet irradiation are also added. Discharge between 5a is promoted.
[0076]
That is, when the electrodes 5a and 5s existing in the discharge space of the arc tube 4 are irradiated with ultraviolet rays having energy equal to or higher than the work function of the electrode constituent metal, electrons are emitted from the surfaces of the electrodes 5a and 5s. The number increases and discharge is likely to occur.
[0077]
When the bimetal in the glow starter 81 is cooled and separated from the discharge electrode, a high voltage pulse is generated in the ballast of the lighting circuit device 89 and applied to both the main electrodes 5a and 5b. , 5b, the arc tube 4 can be easily started within a short time, and thereafter stable lighting can be maintained.
[0078]
If the discharge shifts between the main electrodes 5a and 5b, the temperature of the arc tube 4 rises, the thermal responsive switch 82 is opened, the electrical connection to the glow starter 81 is cut off, and no glow discharge occurs. At the same time, energization to the auxiliary electrode 5s is also stopped.
[0079]
As described above, the high-pressure metal vapor discharge lamp L of the present invention is provided with the ultraviolet radiation starting element composed of the glow starter 81 toward the electrodes 5a and 5s of the arc tube 4, so that the initial stage in the arc tube 4 is started. As a result of the increase in the number of electrons, it is possible to provide a discharge lamp L with improved starting characteristics that facilitates and ensures the occurrence of discharge and reduces the time required for starting the lamp L.
[0080]
Further, the high-pressure metal vapor discharge lamp L is not electrically connected to the support members 7a and 7b that support the arc tube 4 and the hollow tube 6, so that no electric potential is applied. Since the power supply to the main electrode 5b is performed by a power supply line 74 made of a thin wire that is far away, it is possible to prevent sodium ions and the like from escaping from the inside of the arc tube bulb 40 by the photoelectron action during lighting, and the luminous efficiency of the discharge lamp L is reduced. Or increasing the lamp voltage to shorten the service life.
[0081]
Further, even if the arc tube bulb 40 is broken and glass pieces are scattered, the hollow tube 6 is provided to surround the arc tube 4, thereby preventing this or reducing the impact and reducing the outer bulb 1 Stress can be reduced, and the outer tube valve 1 can be prevented from being damaged, thereby greatly contributing to safety.
[0082]
Further, since the lamp L is shielded from the heat radiation of the arc tube 4 by the hollow tube 6 disposed close to and surrounding the arc tube 4, the arc tube bulb 40 is further heated. That is, this temperature rise also raises the temperature of the entire arc tube bulb 40 and the root portions of the inner end electrodes 5a and 5b that form the coldest portion, so that the luminescent metal enclosed in the bulb 40 is well evaporated. Thus, it is possible to provide a high-pressure metal vapor discharge lamp with improved vapor pressure and improved characteristics such as luminous efficiency and color rendering.
[0083]
3 and 4 and Table 1 show a glow starter (UV radiation starting element) from the outer surface side of an imaginary line in which the hollow tube 6 having a cylindrical shape is extended to the support member 7a side in the high pressure metal vapor discharge lamp L. It is explanatory drawing, the graph, and the table | surface which investigated about the time required for starting at the time of separating the lighting tube 81 gradually.
[0084]
The sample lamp is a metal halide lamp with a rated power of 700 W, the outer diameter is about 150 mm, the outer diameter is about 370 mm (from the sealing part to the top part), and the outer diameter is about 370 mm. 29 mm, total length is about 130 mm, discharge space (between ends) is about 88 mm, distance between electrodes is about 65 mm, and inside is about 42.8 mg of halide composed of Sc-Na-I-Br as a discharge medium. An arc tube 4 containing about 90 mg of mercury and about 2.0 kPa of argon Ar, and a quartz glass surrounding the arc tube 4 and having a cylindrical shape with an outer diameter of about 45 mm, an inner diameter of about 41 mm, and an overall length of about 98 mm A translucent hollow tube 6 is accommodated and supported by a pair of support members 7a and 7b.
[0085]
The glow starter 81 provided on one support member 7a side encloses a bimetal electrode, argon Ar, and mercury Hg in a bulb made of ultraviolet transparent soft glass having an outer diameter of about 12 mm and a total length of about 30 mm. The distance between the bulb end and the end of the arc tube 4 is about 70 mm, the shortest distance between the end of the glow starter 81 and the electrode 5a is about 100 mm, and the arc tube 4 axis and the glow starter 81 axis are parallel. It is arranged in a state.
[0086]
3 is an explanatory view showing the position of the glow starter 81 arranged with respect to the imaginary line in which the hollow tube 6 is extended to the support member 7a side, and FIG. 4 gradually shows the glow starter 81 from the outer surface side of the imaginary line. In the graph in which the time required for starting in the case of being separated is examined, the horizontal axis indicates the protrusion rate S / D from the outer surface side of the hollow tube 6 of the glow starter 81 (the hollow from the outermost surface of the bulb of the glow starter 81) When the separation distance Smm to the outer surface of the tube 6 / bulb outer diameter Dmm of the glow starter 81 and the entire glow starter 81 is in the hollow tube 6, S / D is less than 100%), and the vertical axis indicates the lamp start This is the time (Sec) required from the time the power is turned on until the arc is generated in the arc tube.
[0087]
According to FIG. 4, the protrusion ratio S / D × 100% of the glow starter 81 from the outer surface side of the hollow tube 6 is less than 100%, that is, at least a part of the glow starter 81 overlaps with the hollow tube 6. If in position, the discharge lamp L could be started within 30 seconds.
[0088]
Table 1 shows the number of possible start of the 10 sample lamps within 30 seconds when the position and direction of the glow starter 81 are changed.
[0089]
In Table 1, the alphabetical characters indicate the positions at which the glow starters 81 are arranged, and are located at the approximate center of the outer surface of the imaginary line obtained by extending the cylindrical hollow tube 6 to the support member 7a side. 0%), part of outer surface (thickness of hollow tube) B position (S / D is about 90%), outside part C position (S / D is about 120%) In addition, the glow starter 81 having the highest ultraviolet radiation emission is disposed opposite the arc tube 4 side, and the glow starter 81 seal portion side is disposed obliquely with the arc tube 4 side being disposed. The glow starter 81 was examined in a state of being opposed to the arc tube 4 in a horizontal state.
[Table 1]

As is apparent from Table 1, when a glow starter 81 is arranged near the center of the hollow tube 6 (= the arc tube 4) (A... S / D is 0%), the action of ultraviolet irradiation is large and the starting characteristics of the lamp are good. Met. In addition, the starting characteristics deteriorated as the distance from the center of the hollow tube 6 (= the arc tube 4) increased (as S / D increased). Furthermore, the orientation of the glow starter 81 is best in the vertical direction coaxial with the hollow tube 6 (= the arc tube 4), and the starting characteristics tend to decrease as the state changes from the inclined state to the horizontal state.
[0090]
In the present invention, a large amount of ultraviolet light is irradiated from the ultraviolet radiation starting element 81 toward the arc tube 4 at the time of starting. To be It is desirable that there is a space between the two. In addition, since the support members 7a and 7b, the feeder lines 74 and 75, or the lighting circuit components disposed in the vicinity act as a reflector and irradiate the arc tube 4 with ultraviolet rays from the ultraviolet radiation starting element 81, The ultraviolet radiation starting element 81 is more preferably disposed between the support members 7a and 7b, the feeder lines 74 and 75, the lighting circuit components, and the like.
[0091]
FIG. 5 is a longitudinal sectional view showing an outline of an embodiment of a lighting device 9 for a high ceiling such as for sports facility lighting equipped with the high-pressure metal vapor discharge lamp L according to the present invention.
[0092]
In FIG. 3, the lighting fixture 9 has a socket 92 attached to a base 91 that forms a mounting portion on a ceiling surface and the like, and a guard 93 is provided surrounding the socket 92. A reflective shade 94 having a conical shape made of a metal plate or enamel and having a reflective surface formed on the inner surface is fixed to the lower end of the guard 93, and the base 3 of the discharge lamp L is attached to the socket 92. Holding and electrical connection is made.
[0093]
In this embodiment, the base 91, the guard 93, the reflective shade 94, and the like constitute an instrument body. Further, the lamp lighting circuit device 89 and a power switch (not shown) are provided in a place different from the instrument body.
[0094]
Such a lighting fixture 9 is attached to the ceiling surface of a sports facility, for example, with the opening side of the reflective shade 94 facing downward, and when a power switch is turned on, the power supply 88 turns on the discharge circuit device 89 and the discharge lamp via the socket. L is energized.
[0095]
When the lamp L in a vertical state with the base 3 side upward (base-up) in the reflecting shade 94 is turned on, visible light from the lamp L is reflected by the reflecting surface or directly opens the opening. The light passes through and irradiates the coat or ground surface, which is an object to be irradiated, to obtain a predetermined illuminance.
[0096]
Therefore, the lighting fixture 9 according to the embodiment of the present invention using the high-pressure metal vapor discharge lamp L can improve the starting characteristics and improve the safety corresponding to the lamp L. It is possible to provide a luminaire that can omit the provision of a protective cover member for preventing scattering, which is made of tempered glass or wire mesh, in the part.
[0097]
The present invention is not limited to the above embodiment. For example, the attachment of the hollow tube to the support member is not limited to the ring-shaped metal plate formed with the upright pieces, but a band member that provides an incision in the axial direction at the end of the hollow tube and fixes the incision to the arc tube You may make it perform by means, such as mounting | wearing.
[0098]
In addition, the support member that supports the arc tube and the hollow tube is configured so that no potential is applied to avoid photoelectron action by a pair of upper and lower support members separated from each other. However, in an arc tube that does not enclose sodium halide, The power supply member may be used to apply a potential to the support member, or the support member may be integrally connected with the upper and lower sides by a conductive member or the like.
[0099]
In addition, the lighting fixture according to the present invention is not limited to the lighting of the discharge lamp in a vertical state, but can of course be applied to a fixture that lights up in a horizontal or inclined state.
[0100]
【Effect of the invention】
According to the invention of claim 1, the arrangement of the ultraviolet radiation starting element is provided. The side with the most UV transmission By making it coaxial with the arc tube within the virtual extension line of the hollow tube, ultraviolet rays can irradiate the arc tube efficiently and the discharge lamp can be started easily and reliably, and the time required for starting can be shortened. A high-pressure metal vapor discharge lamp can be provided.
[0101]
Further, in the present invention, even if the arc tube bulb is broken and glass pieces are scattered, the hollow tube surrounding the arc tube prevents this or reduces the impact and affects the outer bulb. The stress can be reduced and the outer tube valve can be prevented from being damaged, which can greatly contribute to safety.
[0102]
In addition, since the heat radiation is shielded by the hollow tube, the temperature of the arc tube bulb rises as a whole, and the root of the electrode at the inner end of the bulb that forms the coldest part is also raised, so it is enclosed in the bulb It is possible to provide a high-pressure metal vapor discharge lamp having various advantages such as heating the luminescent metal to increase the vapor pressure and improving the light emission characteristics such as light emission efficiency and color rendering.
[0103]
Claim 2 According to the invention, effective ultraviolet radiation can be performed by using a glow starter (lighting tube) or an enhancer in which mercury is enclosed in the bulb as the ultraviolet radiation starting element.
[0104]
Claim 3 According to the invention, the longer the hollow tube is, the more it is possible to prevent scattering of a glass piece or the like when the arc tube bulb is ruptured, but it is sufficient that at least the inner end portion of the arc tube is covered. In addition, a predetermined effect can be obtained, for example, the light emission characteristics can be improved by keeping the inner end portion forming the coldest portion of the bulb warm.
[0105]
Claim 4 According to the present invention, the present invention is applied to a discharge lamp having an arc tube in which a halide is enclosed as a discharge medium, and the above-described claims 1 to 3 It is possible to provide a high-pressure metal vapor discharge lamp that exhibits the same effect as described above.
[0106]
In addition, by supporting the arc tube and the hollow tube on a support member that does not apply an electric potential, it is possible to prevent sodium ions and the like from escaping from the arc tube bulb due to photoelectron action during lighting, and the discharge lamp reduces the luminous efficiency. In addition, it is possible to provide a high-pressure metal vapor discharge lamp that prevents the lamp voltage from increasing and shortening the service life.
[0107]
Claim 5 According to the present invention, the above claims 1 to 4 Incorporating a high-pressure discharge lamp with the effects described in, the luminous characteristics are improved, and a highly safe lighting fixture that does not scatter glass pieces should the arc tube bulb break. it can.
[Brief description of the drawings]
FIG. 1 is a front view showing an outline of a high-pressure metal vapor discharge lamp according to an embodiment of the present invention.
FIG. 2 is a circuit diagram of a lighting circuit of the high-pressure metal vapor discharge lamp shown in FIG.
FIG. 3 is an explanatory view schematically showing the location of the glow starter with respect to the hollow tube in the high-pressure metal vapor discharge lamp shown in FIG. 1;
FIG. 4 is a graph showing the time required for starting when the glow starter is gradually separated from the outer surface side of the imaginary line extending from the hollow tube.
FIG. 5 is a front view showing an outline of a lighting device for a high ceiling such as for sports facility lighting equipped with a high-pressure metal vapor discharge lamp according to an embodiment of the present invention.
[Explanation of symbols]
L: High-pressure metal vapor discharge lamp (metal halide lamp)
1: Outer pipe valve
4: arc tube
40: arc tube bulb
4a, 4b: Sealing part
5a, 5b: Electrode (main electrode)
6: Translucent hollow tube
7a, 7b: Support members
81: Glow starter (ultraviolet radiation starting element)
9: Lighting equipment

Claims (5)

An arc tube in which at least a pair of electrodes are provided in an arc tube bulb made of a heat-resistant and light-transmitting hermetic vessel and in which a discharge medium is enclosed;
A cylindrical hollow tube made of a heat-resistant translucent member disposed around the arc tube;
A pair of support members supporting both ends of the arc tube and the hollow tube;
Within the virtual extension line of the outer surface of the hollow tube, a space is formed between the arc tube and the arc tube with the most UV transmission in the coaxial direction and at least 200 nm to 460 nm in wavelength. A starting circuit component including a starting element that emits ultraviolet radiation;
A power supply member electrically connected to the electrode and starting circuit component;
An outer tube bulb containing an inert gas, a nitrogen gas or a vacuum atmosphere containing a pair of support members for supporting the arc tube, the hollow tube and the starting circuit component;
A high-pressure metal vapor discharge lamp comprising: 2. The high-pressure metal vapor discharge lamp according to claim 1 , wherein the starting element that emits ultraviolet rays is a glow starter or an enhancer. The high-pressure metal vapor discharge lamp according to claim 1 or 2 , wherein the hollow tube has a length covering at least an inner end portion of the arc tube bulb. The high-pressure metal vapor discharge lamp according to any one of claims 1 to 3, wherein a halide is enclosed as a discharge medium. An instrument body;
A high-pressure metal vapor discharge lamp according to any one of claims 1 to 4 disposed in the appliance body;
A lighting circuit device connected to the high pressure metal vapor discharge lamp;
The lighting fixture characterized by comprising.

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