JPS61261055A - Ultraviolet ray irradiation device - Google Patents

Abstract

PURPOSE:To enable installation of a lamp away from a reflective body to maintain a wall temperature of the lamp tubing within an appropriate range by exhausting from an exhaust vent located in the back side of the lamp a cooling air which entered from a gas inlet provided at a projection opening of the reflective body. CONSTITUTION:The title device is provided with a projection opening 6 in its front, and a reflective body 5, with a concave section, positioned in the back of a high- voltage discharge lamp 4, having an exhaust vent 7 facing the high-voltage discharge lamp 4. A cooling air is designed to flow in from gas intake ports 12 provided on both sides of the projection opening 6 of the reflective body 5, and to flow along the reflection surface of the reflective body 5, passing around the lamp tube to be exhausted from the exhaust vent 7. By the above structure, a lamp with a capacity equal to or above 90 W per 1 cm of an arc length may be located away from the reflective body, and an over-heating caused by the heat of the lamp of the reflective body may be efficiently avoided. In addition, tube wall temperatures may be held in an appropriate range to bring about an even distribution of the temperature, and devitrification of the lamp glass tube or decrease in ultraviolet ray output is well prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高圧放電ランプを用いた紫外線照射装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultraviolet irradiation device using a high-pressure discharge lamp.

〔従来の技術〕[Conventional technology]

プリント合板、プリント配線基板あるいは新聞印刷など
の印刷工程において、紫外線硬化性の塗料、インク等を
塗布した基体に紫外線を照射して塗料、インクなどを硬
化させる方法が知られている。BACKGROUND ART In printing processes such as printed plywood, printed wiring boards, and newspaper printing, a method is known in which a substrate coated with ultraviolet-curable paint, ink, etc. is irradiated with ultraviolet rays to cure the paint, ink, etc.

そして、このような方法において、紫外線を照射するた
とえば高圧水銀ランプ、メタルハライドランプなどの高
圧放電ランプは紫外線とともに可視光線および赤外線も
発生するので、この高圧放電ランプを収納する反射体な
ど装置自体および塗料、インク等や基体に熱を加えて装
置を熱損したり紫外線硬化の光化学反応を阻害したりす
ることから、一般に高圧放電ランプの周囲の空気を排出
し冷風を吸引して装置内の熱を除去する構造が採れてい
る。しかし、このような構造によると、高圧放電ランプ
の管体表面に冷風が当る風上側は冷却効果は高いが、風
下側圧は渦流が生じて冷却効果が低くなり、高圧放電ラ
ンプの管体表面の温度分布が不均一となり、特に風下側
に局部的な熱損が発生する問題がある。In this method, high-pressure discharge lamps such as high-pressure mercury lamps and metal halide lamps that emit ultraviolet rays emit visible light and infrared rays as well as ultraviolet rays. , heat is applied to the ink, etc. and the substrate, which can cause heat damage to the equipment and inhibit the photochemical reaction of ultraviolet curing, so the heat inside the equipment is generally removed by exhausting the air around the high-pressure discharge lamp and sucking in cold air. A structure has been adopted to do so. However, with this structure, the cooling effect is high on the windward side where the cold air hits the tube surface of the high pressure discharge lamp, but the cooling effect is low due to the eddy current generated on the leeward side pressure. There is a problem in that the temperature distribution becomes uneven and localized heat loss occurs, especially on the leeward side.

すなわち、この種紫外線照射装置に用いる高圧放電ラン
プにおいては１石英ガラスで形成される管体の失透を防
止することから、管体の管壁温度はほぼ８００℃を越え
ないことが好まし〜１゜また。That is, in a high-pressure discharge lamp used in this type of ultraviolet irradiation device, in order to prevent devitrification of the tube made of quartz glass, it is preferable that the tube wall temperature of the tube does not exceed approximately 800°C. 1° again.

ランプからの紫外線を安定して出力させるために。In order to stably output ultraviolet light from the lamp.

管体の管壁温度をはぼ６００℃以上に保ち、ランプ管体
内の蒸気圧を所定のレベルまで高め、保持させることが
必要である。It is necessary to maintain the tube wall temperature of the lamp tube at approximately 600° C. or higher, and to raise and maintain the vapor pressure within the lamp tube to a predetermined level.

そして、近時、電気入力の大きい高圧放電ランプ、特に
アーク長１ａＬ当り９０Ｗ以上の放電ランプカ用イラれ
てきており、このランプにおいても上記温度範囲を保持
することが要求される。Recently, high-pressure discharge lamps with a large electrical input, especially discharge lamps with a power of 90 W or more per 1 aL of arc length, have become increasingly popular, and these lamps are also required to maintain the above-mentioned temperature range.

このようなことから、アーク長が１ｃｍ当り９０Ｗ以上
の高圧放電ランプを用いる紫外線照射装置において、高
圧放電ランプの管体管壁温度を均一に保つようにしたも
のとして、たとえば特公昭５５−１６２８１号公報に記
載されたものが提案された。For this reason, in an ultraviolet irradiation device using a high-pressure discharge lamp with an arc length of 90 W or more per 1 cm, for example, Japanese Patent Publication No. 55-16281 has proposed a device that maintains the temperature of the tube wall of the high-pressure discharge lamp uniformly. The proposal described in the official gazette was proposed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

この特公昭５５−１６２８１号公報に記載されたものは
、ランプ表面の風下側と凹面反射鏡の最深部に設けた冷
却風吸込部との距離をランプの管体直径の２／３以下に
することにより、渦流の発生を防止するようにしている
。しかし、このもの４１反射鏡の投光開口面が開Ｉされ
、冷却風が反射鏡の開口全面から吸引され、冷却風が管
体の管壁に沿って流れるものであるので、特にアーク長
が１ｃｍ当り９０Ｗを越える高圧放電ランプを用〜する
ものでは、ランプと反射鏡の位置関係が所定の範囲に設
定されないと、ランプの冷却効果が低くなる。The device described in Japanese Patent Publication No. 55-16281 sets the distance between the leeward side of the lamp surface and the cooling air suction part provided at the deepest part of the concave reflector to be 2/3 or less of the lamp tube diameter. This prevents the generation of vortices. However, in this case, the light emitting aperture surface of the reflector 41 is opened, and the cooling air is sucked in from the entire surface of the aperture of the reflector, and the cooling air flows along the tube wall of the tube body, so the arc length is particularly low. In devices that use high-pressure discharge lamps exceeding 90 W per cm, unless the positional relationship between the lamp and the reflector is set within a predetermined range, the cooling effect of the lamp will be reduced.

すなわち、ランプを反射鏡の最深部に近接させた場合は
９反射鏡の最深部近傍の温度力を上昇して熱歪みによる
局所的損害が生じるおそれがある。That is, if the lamp is brought close to the deepest part of the reflecting mirror, the temperature force near the deepest part of the nine reflecting mirrors may increase, causing local damage due to thermal distortion.

そして、上述のようにアー□り長が１ｃ’ｓｔ当り９０
Ｗ以上の高圧放電ランプを用いるもので、ランプを反射
鏡、に近接するように配設するものでは１反射鏡の最深
部近傍の温度が過昇しないよ５に設定しなければならず
、ランプの配設位置が小さい範囲に制約されてしまう不
都合がある。As mentioned above, the arc length is 90 per c'st.
If a high-pressure discharge lamp of W or more is used and the lamp is placed close to a reflector, the temperature must be set to 5 to prevent the temperature near the deepest part of the reflector from rising too much. There is an inconvenience that the arrangement position is restricted to a small range.

本発明は上述の事情を考慮してなされたもので。The present invention has been made in consideration of the above circumstances.

アーク長がＩＣＩＬ当り９０Ｗ以上の高圧放電ランプを
用いて紫外線を照射するものにおいて、ランプを反射体
から遠ざけて配置でき、しかもランプ管体の管壁温度を
適正範囲に保持でき、かつ温度分布の均一化が図れ、ラ
ンプ管体の失透あるいは紫外線出力の低下を良好に防止
した紫外線照射装置を提供することを目的とする。When irradiating ultraviolet rays using a high-pressure discharge lamp with an arc length of 90 W or more per ICIL, the lamp can be placed away from the reflector, the temperature of the tube wall of the lamp body can be maintained within an appropriate range, and the temperature distribution can be adjusted. It is an object of the present invention to provide an ultraviolet irradiation device that achieves uniformity and satisfactorily prevents devitrification of a lamp tube body or a decrease in ultraviolet output.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は管形の高圧放電ランプと、前面に投光開口を有
するとともに高圧放電ランプの背方側に位置して排気口
を設け高圧放電ランプに対向して配設された断面凹面状
の反射体と、この反射体の投光開口を閉そくするように
配設され少なくとも紫外線を透過する透光部材と１反射
体の投光開口を挾む両側部に反射体の排気口に連通して
設けられた気体流入口と、備え、高圧放電ランプはアー
ク長が１ｃｒｒＬ当り９０Ｗ以上のもので、ランプの管
体頂部と反射体の排気口との距離が管体直径の２／３を
越えていることを特徴とする。The present invention relates to a tube-shaped high-pressure discharge lamp and a reflective tube having a concave cross-section, which has a light emitting opening on the front surface, an exhaust port located on the back side of the high-pressure discharge lamp, and is arranged opposite to the high-pressure discharge lamp. a light transmitting member disposed to block the light emitting opening of the reflector and transmitting at least ultraviolet rays; and a light transmitting member disposed on both sides sandwiching the light emitting aperture of the reflector so as to communicate with the exhaust port of the reflector. A high-pressure discharge lamp is equipped with a gas inlet port and a high-pressure discharge lamp with an arc length of 90 W or more per 1 crrL, and the distance between the top of the lamp tube and the exhaust port of the reflector exceeds 2/3 of the tube diameter. It is characterized by

〔作用〕[Effect]

本発明は冷却風が反射体の投光開口を挾む両側部に設け
た気体流入口から流入し反射体の反射面に沿いランプの
管体周辺をとおって排気口から排風されるよ５Ｋしたも
のである。In the present invention, cooling air flows in from the gas inlets provided on both sides of the reflector that sandwich the light projection opening, passes along the reflective surface of the reflector, passes around the lamp body, and is exhausted from the exhaust port. This is what I did.

〔実施例〕〔Example〕

つぎに２本発明の実施例を図面を参照して説明する。第
１図および第２図は本発明の第１の実施例を示す。１は
筐体で、この筐体１は細長直方体形状に形成され、下面
に開口２を有するとともに上面に長手方向に沿って細長
の溝３が形成されている。４は管形の高圧放電ランプ、
５は断面凹面状に形成された反射体で、この反射体５は
前面に投光開口６を有するとともに高圧放電ランプ４の
背方側に位置して排気ロアを設け高圧放電ランプ４にそ
の長手方向に沿って対向配置されている。Next, two embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the invention. Reference numeral 1 denotes a housing, and the housing 1 is formed in the shape of an elongated rectangular parallelepiped, and has an opening 2 on the lower surface and an elongated groove 3 formed in the upper surface along the longitudinal direction. 4 is a tube-shaped high-pressure discharge lamp;
Reference numeral 5 denotes a reflector having a concave cross section, and this reflector 5 has a light emitting opening 6 on the front surface and an exhaust lower located on the back side of the high pressure discharge lamp 4 so that the high pressure discharge lamp 4 has a longitudinal direction. They are arranged opposite to each other along the direction.

この反射体５は一対゛の反射部材８，８で形成され。This reflector 5 is formed by a pair of reflecting members 8, 8.

上端を筐体１の上面溝部３周縁に設けた支持部９に支持
固定されているとともに下端を筐体１の下面開口２の周
縁に設けた支持部１０　Ｋ支持固定され、排気ロアを溝
部３に連通させている。１０は透光部材で、この透光部
材１０は反射体５の投光開口６を閉そくするようにして
配設されている。この透光部材１０は気体の流入をしゃ
断し、かつ少なくとも紫外線を透過するよ５に形成され
、筐体１の下面開口２端部に係合された支持体１１に支
持されることを可とする。１２　、１２は反射体５の排
気ロアに連通して設けられた気体流入口で、この気体流
入口１２　、１２は反射体５の投光開口６を挾む両側部
に設けられている。本実施例では透光部材１゜を支持す
る支持体１１の側面に離間して設けられた複数個の円孔
で形成されている。The upper end is supported and fixed to a support part 9 provided at the periphery of the upper surface groove 3 of the casing 1, and the lower end is supported and fixed to a support part 9 provided at the periphery of the lower surface opening 2 of the casing 1. It communicates with Reference numeral 10 denotes a light-transmitting member, and this light-transmitting member 10 is arranged so as to close the light projection opening 6 of the reflector 5. The light-transmitting member 10 is formed in a shape 5 to block the inflow of gas and transmit at least ultraviolet rays, and can be supported by a support 11 engaged with the end of the lower opening 2 of the housing 1. do. Reference numerals 12 and 12 denote gas inlets that are provided in communication with the exhaust lower of the reflector 5, and these gas inlets 12 and 12 are provided on both sides of the reflector 5 sandwiching the light projection opening 6. In this embodiment, it is formed of a plurality of circular holes spaced apart from each other on the side surface of the support 11 that supports the transparent member 1°.

そして、上記高圧放電ランプ４はたとえば鉄系成分を封
入したメタルハライドランプで、紫外線とともに可視光
線および赤外線をも放射するものを可とする。The high-pressure discharge lamp 4 is, for example, a metal halide lamp containing an iron-based component, and may emit visible light and infrared light as well as ultraviolet light.

また、上記反射体５はたとえば硼珪酸ガラスにて二次曲
面に形成された基体５ａ内面（高圧放電ランプ４に対向
する側）にたとえば酸化チタン（Ｔｉｅ）。The reflector 5 is made of, for example, borosilicate glass and has a base 5a formed into a quadratic curved surface.The inner surface (the side facing the high-pressure discharge lamp 4) of the base body 5a is coated with, for example, titanium oxide (Tie).

酸化ジルコニウム（Ｚｒｏ２　）などからなる高屈折率
層と、シリカ（ＳｉＯ２）　＃　フッ化マグネシウム（
ＭｇＦｚ）などからなる低屈折率層とを交互に１０層〜
６０数層重層した多層干渉薄膜５ｂを蒸着して形成され
ている。この多層干渉薄膜５ｂを形成した反射体５は高
圧放電ランプ４・から放射される波長的２００〜４００
ｆ１ｍの紫外線を効果的に投光開口６方向に反射し、波
長約７００ｎｍ以上の赤外線域を透過させるとともに一
部の可視光線域も透過させるものである。A high refractive index layer made of zirconium oxide (Zro2) etc., silica (SiO2) #magnesium fluoride (
10 or more layers of low refractive index layers made of MgFz) etc.
It is formed by vapor-depositing a multilayer interference thin film 5b in which about 60 layers are stacked. The reflector 5 on which the multilayer interference thin film 5b is formed is used to reflect the wavelengths of 200 to 400 emitted from the high pressure discharge lamp 4.
It effectively reflects f1m ultraviolet rays in the direction of the light projection aperture 6, transmits infrared rays having a wavelength of approximately 700 nm or more, and also transmits part of visible rays.

また、透光部材１０はたとえば紫外線を透過する石英ガ
ラスからなる基体１０ａの内面（高圧放電ランプ４に対
向する側）にたとえば酸化ジルコニウム（Ｚｒｏ２）、
酸化ハフニウム（ＨｆＯｚ）などからなる高屈折率層と
、シリカ（Ｓｔｏｗ）、フッ化マグネシウム（ＭｇＦｚ
）などからなる低屈折率層とを交互に１０層〜６０数層
重層した多層干渉薄膜１０ｂを蒸着して形成している。Further, the light-transmitting member 10 includes, for example, zirconium oxide (Zro2),
A high refractive index layer made of hafnium oxide (HfOz), silica (Stow), magnesium fluoride (MgFz), etc.
A multilayer interference thin film 10b is formed by depositing 10 to 60-odd layers of low refractive index layers such as 10 to 60 layers alternately.

この多層干渉薄膜１０ｂを形成した透光部材１０は高圧
放電ランプ４から放射される波長的２００〜４００ｎｍ
の紫外線域を透過し【可視光線を反射するとともに一部
の赤外線も反射するものである。The light-transmitting member 10 on which this multilayer interference thin film 10b is formed is radiated from the high-pressure discharge lamp 4 at a wavelength of 200 to 400 nm.
It transmits the ultraviolet rays, reflects visible rays, and also reflects some infrared rays.

また、筺体１の側面１ａおよび上面１ｂには反射体５の
背面側に位置して気体流通口１３ａ、１３ｂが形成され
ている。そして１反射体５の排気ロアおよび筐体１の上
面１ｂの気体流通口１３ｂは図示しない吸引装置に連通
している。Furthermore, gas flow ports 13a and 13b are formed on the side surface 1a and the top surface 1b of the housing 1 so as to be located on the back side of the reflector 5. The exhaust lower of the first reflector 5 and the gas flow port 13b on the upper surface 1b of the housing 1 communicate with a suction device (not shown).

そうして、上記高圧放電ランプ４はアーク長が１ｃ’ｘ
当り９０Ｗ以上、たとえば１２０Ｗで形成され。Then, the high pressure discharge lamp 4 has an arc length of 1c'x
It is formed with a power of 90W or more, for example, 120W.

反射体５内に没入させた位置で、かつランプ４の管体４
ａ頂部Ａと反射体５の排気ロアとの距離りがランプ４の
管体４ａの直径りの２／３を越えている。At the position where it is immersed in the reflector 5 and the tube body 4 of the lamp 4
The distance between the top A and the exhaust lower part of the reflector 5 exceeds 2/3 of the diameter of the tube body 4a of the lamp 4.

すなわち、高圧放電ランプ４は管体４ａの底部Ｂが反射
体５の投光開口６面より内方にあり、かつ。That is, in the high-pressure discharge lamp 4, the bottom portion B of the tube body 4a is located inward from the surface of the light projection opening 6 of the reflector 5, and.

管体４ａの頂部人と反射体５の排気ロアとの距離りがラ
ンプ４の管体直径りの２／３を越えている位置に配設す
ることを要するものである。本実施例では反射体５の排
気ロアは反射部材８，８を支持固定している支持部９の
開口端Ｃからの距離である。It is necessary to arrange the lamp at a position where the distance between the top of the tube 4a and the exhaust lower part of the reflector 5 exceeds 2/3 of the tube diameter of the lamp 4. In this embodiment, the exhaust lower part of the reflector 5 is the distance from the open end C of the support part 9 supporting and fixing the reflecting members 8, 8.

つぎに、この実施例における実験例によって本発明を説
明する。Next, the present invention will be explained by an experimental example in this embodiment.

高圧放電ランプ４として、ランプ管体４ａの直径２７ｎ
、全長８４０ｍ５　ランプ電力８．４ｋＷ、アーク長が
１ｃｍ当り１２０Ｗの鉄系成分を封入したメタルハライ
ドランプを用い、排風量３．５”／ｇで排気した場合に
おいて、ランプ４の位置を反射体５の排気ロアに近接、
すなわち、ランプ４の管体４ａの頂部Ａと排気ロアとの
距離りを管体直径２７１ｍの２／３以下の６ｆｉにし、
排気ロアから図示しない吸引装置によって排気している
状態でのランプ管体４ａの管壁温度を測定したところ、
ランプ管体４ａの頂部Ａでは第３図に示すように約５５
０℃、底部Ｂでは約７５０℃であり、頂部人の温度が比
較的上昇しないので、底部Ｂの温度より着るしく低くな
ってしまい、紫外線を安定して出力させるための適正温
度であるほぼ６００℃が保持できなくなる。したがって
、紫外線を安定して出力させるための温度約６００℃に
保つに−は、たとえば、排風量を低減させなければなら
なくなる。しかし、このようにすると、ランプ管体４ａ
の底部Ｂの温度は約８００°Ｃを越え適正温度を保持で
きなくなった。As the high pressure discharge lamp 4, the diameter of the lamp tube body 4a is 27n.
, total length 840 m5 When using a metal halide lamp filled with iron-based components with a lamp power of 8.4 kW and an arc length of 120 W per cm, and exhaust air with an exhaust air volume of 3.5"/g, the position of the lamp 4 is set to the reflector 5. Close to exhaust lower,
That is, the distance between the top A of the tube body 4a of the lamp 4 and the exhaust lower is set to 6fi, which is less than 2/3 of the tube diameter of 271 m.
When the tube wall temperature of the lamp tube body 4a was measured while exhaust was being exhausted from the exhaust lower by a suction device (not shown),
At the top A of the lamp tube body 4a, as shown in FIG.
0℃, and at bottom B it is about 750℃, and since the temperature of the person at the top does not rise relatively, it is comfortably lower than the temperature at bottom B, and it is about 600℃, which is the appropriate temperature for stably outputting ultraviolet rays. The temperature cannot be maintained. Therefore, in order to maintain the temperature at about 600° C. for stable output of ultraviolet rays, the amount of exhaust air must be reduced, for example. However, in this case, the lamp tube body 4a
The temperature at the bottom B exceeded approximately 800°C, making it impossible to maintain an appropriate temperature.

つぎに、ランプ４を反射体５の排気ロアより投光開口６
側に移動させて、ランプ管体４ａの頂部Ａと排気ロアと
の距離りをランプ管体４ａの直径２７龍の２／３を越え
た１９１Ｈにした場合は、第４図に示すようにランプ管
体４ａの頂部Ａの温度は約７５０℃。Next, the lamp 4 is inserted into the light emitting opening 6 from the exhaust lower part of the reflector 5.
If the distance between the top A of the lamp tube body 4a and the exhaust lower is set to 191H, which is more than 2/3 of the diameter 27 of the lamp tube body 4a, as shown in FIG. The temperature of the top A of the tube body 4a is about 750°C.

底部Ｂは約７６０℃で、頂部Ａおよび底部Ｂともほぼ均
一の温度分で、しかも適正温度範囲のほぼ６００　’Ｃ
〜はぼ８００℃内に保持させることができた。Bottom part B is approximately 760'C, and both top part A and bottom part B are approximately uniform in temperature, and moreover, the temperature is approximately 600'C, which is the appropriate temperature range.
It was possible to maintain the temperature within 800°C.

このことは２反射体５の投光開口６が透光部材１０によ
って閉そくされ、投光開口６を挾む両側部に形成された
気体流入口１２　、１２から流入した冷却風が主に反射
体５００反射に沿って流れ、排気ロアから排気されるた
め、ランプ４を反射体５に近接させて配置するとランプ
管体４ａの頂部Ａが底部Ｂより過冷却されて適正温度に
保てなくなることを示し、また、ランプ４を反射体５か
ら遠ざけることＫよりランプ管体頂部Ａの冷却が低減さ
れ。This means that the light emitting aperture 6 of the second reflector 5 is blocked by the light transmitting member 10, and the cooling air flowing in from the gas inlets 12, 12 formed on both sides of the light emitting aperture 6 mainly flows through the reflector. 500 and is exhausted from the exhaust lower. Therefore, if the lamp 4 is placed close to the reflector 5, the top A of the lamp body 4a will be supercooled compared to the bottom B, and it will not be possible to maintain it at an appropriate temperature. Furthermore, by moving the lamp 4 away from the reflector 5, cooling of the lamp tube top A is reduced.

頂部Ａと低部Ｂとの温度差が小さく、シかも適正温度範
囲に入ることを示している。This shows that the temperature difference between the top part A and the bottom part B is small, and even the bottom part falls within the appropriate temperature range.

このこｉは、ランプ４の管体頂部Ａと排気ロアどの距離
りをさらに大きくした２８ｍにした場合に。This is true when the distance between the top A of the lamp 4 and the exhaust lower is increased to 28 m.

第５図に示すようにランプ管体頂部Ａの温度が約７７０
°Ｃ２底部Ｂの温度が約７８０℃であったことからも明
らかとなった。As shown in Figure 5, the temperature at the top A of the lamp tube is approximately 770°C.
This became clear from the fact that the temperature at the bottom B of °C2 was approximately 780 °C.

さらに、ランプ４を反射体５の投光開口６側に近づける
（管体頂部Ａと排気ロアとの距離りを大きくする）と、
ランプ管体の底部Ｂ付近を流れる冷却風の流入量が減少
するため、ランプ管体底部Ｂの温度がランプ管体頂部Ａ
より高くなってくるが、原理的には流入口１２　、１２
の開口径、排風量を調整することにより投光開口６を閉
そくするように配設された透光部材１０に近接するまで
ランプ４と反射体５の排気ロアとの距離を大きくするこ
とは可能である。しかし、ランプ４から放射された紫外
線出力を効果的に制御するために、ランプ４は管体底部
Ｂを反射体５の投光開口面６ａとほぼ一致させた没入状
態が限界位置である。これを越えてまでランプ４の位置
を反射体５の排気ロアから離せばランプ４は安定状態で
維持できても反射体５の反射効率が激減するとともに紫
外線照射装置として所要配光が得られず実用に供さなく
なる。Furthermore, when the lamp 4 is brought closer to the light emitting opening 6 side of the reflector 5 (the distance between the tube top A and the exhaust lower is increased),
Since the amount of cooling air flowing near the bottom B of the lamp tube decreases, the temperature at the bottom B of the lamp tube decreases to the temperature at the top A of the lamp tube.
Although it becomes higher, in principle, the inlet ports 12, 12
By adjusting the aperture diameter and exhaust air volume, it is possible to increase the distance between the lamp 4 and the exhaust lower part of the reflector 5 until the lamp 4 approaches the light-transmitting member 10 arranged so as to block the light emitting aperture 6. It is. However, in order to effectively control the ultraviolet light output emitted from the lamp 4, the limit position of the lamp 4 is in a retracted state in which the tube bottom B is substantially aligned with the light emitting aperture surface 6a of the reflector 5. If the lamp 4 is moved beyond this point from the exhaust lower part of the reflector 5, the lamp 4 may be maintained in a stable state, but the reflection efficiency of the reflector 5 will be drastically reduced and the required light distribution as an ultraviolet irradiation device will not be obtained. It is no longer of practical use.

したがって、ランプ４は反射体５内に没入させた位置で
、かつ管体４ａの頂部と反射体５の排気ロアとを管体直
径りの２／３を越える距離で配設することが、ランプ管
体の管壁温度を適正範囲で保持でき、しかも所要配光が
得られることが実験によって確められた・ この第１の実施例では、多層干渉薄膜を蒸着した紫外線
反射、赤外線透過の反射体および多層干渉膜を蒸着した
紫外線透過、可視光反射の透光部材を用いたが１本発明
においては２反射体の投光開口を挾む両側部に設けた流
入口から反射体内に流入した冷却風が主に反射体の反射
面に沿って流れることにより、所期の効果が得られるも
のであり０反射体をアルミニウム材で形成し、透光部材
を石英ガラス板で形成したものであっても第１の実施例
と同様の結果が得られた。このようなことから１種々の
材質で形成された反射体および透光部材の組合せも可能
となることも明らかである。Therefore, it is preferable to arrange the lamp 4 at a position where it is immersed in the reflector 5, and with a distance between the top of the tube 4a and the exhaust lower part of the reflector 5 that exceeds 2/3 of the tube diameter. It has been confirmed through experiments that the tube wall temperature of the tube body can be maintained within an appropriate range and the required light distribution can be obtained.In this first example, a multilayer interference thin film is deposited to reflect ultraviolet light and infrared light. A light-transmitting member that transmits ultraviolet rays and reflects visible light is used, in which a multilayer interference film is vapor-deposited.1 In the present invention, light flows into the reflector from inlets provided on both sides sandwiching the light projection opening of the reflector. The desired effect is achieved by the cooling air flowing mainly along the reflective surface of the reflector, and the reflector is made of aluminum and the translucent member is made of quartz glass. However, the same results as in the first example were obtained. From this, it is clear that a combination of a reflector and a light-transmitting member made of one variety of materials is also possible.

第５図に示すものは１本発明の第２の実施例を示し、第
１の実施例と同一部分には同一符号を付して説明は省略
する。What is shown in FIG. 5 shows a second embodiment of the present invention, and the same parts as in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

すなわち、この第２の実施例のものは、流入口１２　、
１２を透光部材１０の板面とほぼ同一面に形成したもの
である。That is, in this second embodiment, the inlet 12,
12 is formed on substantially the same plane as the plate surface of the light-transmitting member 10.

そして、このものにおいて、第１の実施例と同様のラン
プを用い。同様の条件で実験を行なったところ、第１の
実施例とほぼ同様の結果が得られた。なお２反射体５を
放物面で形成しランプを焦点に位置させることにより、
広がりがある配光が得られ、また２反射体５をだ円面に
形成しランプを一方の焦点に位置させることにより焦光
形とすることができる。In this case, the same lamp as in the first embodiment was used. When an experiment was conducted under similar conditions, almost the same results as in the first example were obtained. Note that by forming the second reflector 5 with a paraboloid and positioning the lamp at the focal point,
A wide light distribution can be obtained, and by forming the two reflectors 5 in elliptical shapes and positioning the lamp at one focal point, a focal light type can be obtained.

〔発明の効果〕〔Effect of the invention〕

以上詳述したように１本発明によれば９反射体の投光開
口を挾む両側部に設けた気体流入口から流入した冷却風
を反射体にランプの背方側に位置した排気口から排出さ
せるようにしたので、アーり長がｌｃｓ＋当り９０Ｗ以
上のランプを反射体から遠ざけて配設でき２反射体のラ
ンプからの熱による温度過が良好に防止できる。また、
ランプ管体の管壁温度を適正範囲に保持でき、かつ、温
度分布の均一化が図れ、ランプ管体の失透あるいは紫外
線出力の低下を良好に防止できる。As described in detail above, according to the present invention, the cooling air flowing in from the gas inlets provided on both sides of the light emitting opening of the reflector is passed through the exhaust port located on the back side of the lamp to the reflector. Since the lamp is discharged, a lamp having an arc length of 90 W or more per lcs+ can be placed away from the reflector, and overheating of the two reflectors due to heat from the lamp can be effectively prevented. Also,
The tube wall temperature of the lamp tube can be maintained within an appropriate range, the temperature distribution can be made uniform, and devitrification of the lamp tube or reduction in ultraviolet output can be effectively prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２図は本発明の紫外線照射装置の第１の
実施例を示し、第１図は縦断面図、第２図は斜視図、第
３図〜第５図はランプと反射体との距離を変化させた際
のランプ管体の温度説明図。 第６図は本発明の紫外線照射装置の第２の実施例を示す
縦断面図である。 ４・・・・・・高圧放電ランプ、　５・・・・・・反射
体。 ６・・・・・・投光開口、　　　　７・・・・・・排気
口。 １０・・・・・・透光部材、　　　　　１２，１２・・
・・・・気体流入口。1 and 2 show a first embodiment of the ultraviolet irradiation device of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a perspective view, and FIGS. 3 to 5 are a lamp and a reflector. An explanatory diagram of the temperature of the lamp tube body when changing the distance from the lamp body. FIG. 6 is a longitudinal sectional view showing a second embodiment of the ultraviolet irradiation device of the present invention. 4... High pressure discharge lamp, 5... Reflector. 6...Light emission aperture, 7...Exhaust port. 10...Translucent member, 12,12...
...Gas inlet.

Claims (1)

【特許請求の範囲】[Claims] （１）管形の高圧放電ランプと、 前面に投光開口を有するとともに上記高圧放電ランプの
背方側に位置して排気口を設け上記高圧放電ランプに対
向して配設された断面凹面状の反射体と、 上記反射体の投光開口を閉そくするように配設され少な
くとも紫外線を透過する透光部材と、上記反射体の投光
開口を挾む両側部に上記排気口に連通して設けられた気
体流入口と、 を具備し、 上記高圧放電ランプはアーク長が１ｃｍ当り９０Ｗ以上
のもので、上記反射体内に没入させた位置で、かつ管体
の頂部と上記反射体の排気口との距離が管体直径の２／
３を越えていることを特徴とする紫外線照射装置。(1) A tube-shaped high-pressure discharge lamp, and a concave cross-section having a light emission opening on the front face and an exhaust port located on the back side of the high-pressure discharge lamp, and facing the high-pressure discharge lamp. a reflector, a light transmitting member disposed to block the light projection opening of the reflector and transmitting at least ultraviolet rays, and a light transmitting member that communicates with the exhaust port on both sides sandwiching the light projection opening of the reflector. a gas inlet port provided, and the high pressure discharge lamp has an arc length of 90 W or more per 1 cm, and is located at a position immersed in the reflector, and has a gas inlet port provided at the top of the tube and an exhaust port of the reflector. The distance between the
An ultraviolet irradiation device characterized by exceeding 3.