JPH11114511A - Method for cleaning member provided with photocatalyst film and high-pressure discharge lamp and illuminator for activating photocatalyst film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decompose and clean off the contaminant stuck to the photocatealyst film of a member by activating the film with a high-pressure discharge lamp emitting a light in a specified wavelength range. SOLUTION: When a member provided with a photocatalyst film is cleaned, the photocatalyst film 2 provided to the light-transmissive glass member is irradiated with the emission of a high-pressure discharge lamp 3 formed by sealing a discharge medium contg. the halide of a light emitting metal having an excited resonance line in 340-360 nm wavelength range and a rare gas in a light-transmissive airtight vessel and activated. Consequently, the contaminant on the film 2 is cleaned off. Further, as the UV in this range is only slightly absorbed by the glass even if the member 1 is a light-transmissive glass member, the visible light transmittance of the member 1 is not lowered by the coloration of the glass due to polarization, and the member 1 is not discolored or deteriorated by the UV absorption even it is a synthetic resin etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a member provided with a photocatalytic film, a high-pressure discharge lamp for activating a photocatalytic film, and a lighting apparatus using the same.

[0002]

2. Description of the Related Art A photocatalytic film is formed on a translucent glass cover disposed in front of a lighting device installed on a road or a tunnel, and the photocatalytic film is activated by ultraviolet light contained in the light emitted from a built-in light source. The present inventors proposed in Japanese Patent Application Laid-Open No. 9-29103 a lighting fixture that automatically dissolves and removes dirt attached to the translucent glass cover.

[0003] The dirt-decomposing ability of the photocatalytic film changes according to the thickness of the photocatalytic film and the amount of irradiated ultraviolet light. Therefore, the thickness of the photocatalyst film is generally increased on roads and tunnels that are heavily contaminated by exhaust gas from automobiles. However, the increase in the thickness of the photocatalyst film causes the visible light of the translucent glass cover to increase. The transmittance decreases. For this reason, there is a problem that the efficiency of the device is reduced.

On the other hand, there is a relationship that a semiconductor film mainly containing titanium oxide is mainly used as the photocatalyst film, and generally, irradiation with ultraviolet light having a wavelength of 400 nm or less is effective for activation.

[0005] Lighting fixtures installed on roads, tunnels, and the like tend to frequently use high-pressure sodium lamps as light sources for the purpose of energy saving.

In a high-pressure sodium lamp, mercury is encapsulated in the form of sodium amalgam as a buffer metal in addition to sodium, which is a luminescent metal, so that its emission is 330 nm which is an excitation resonance line of sodium and a resonance line of mercury. 313 nm and 365 nm are the main ultraviolet rays emitted.

Accordingly, the present inventors have proposed an invention which transmits a large amount of ultraviolet light effective for activating a photocatalytic film by reducing the amount of an ultraviolet absorbing material such as Fe ₂ O ₃ contained in the outer tube glass of a high-pressure sodium lamp. The present invention has been filed as Japanese Patent Application No. 9-71642.

[0008]

The above-mentioned invention is effective for activating the photocatalytic film. However, when the traffic is extremely large and the dirt is extremely heavy, a stronger dirt-decomposing power is required. Sometimes.

Next, the present inventor conducted an experiment in which the ultraviolet rays emitted from the high-pressure sodium lamp were intentionally increased to irradiate the photocatalytic film. As a result, it was found that the photocatalyst activation corresponding to the increase in the ultraviolet rays could not be obtained. There was found.

As a result of further analysis, generally used soda lime glass absorbs ultraviolet rays having a wavelength of 313 nm and causes solarization. Therefore, when this wavelength component is increased, the lighting time is increased. At the same time, it was found that the soda lime glass generally used for the translucent glass cover was colored, and the visible light transmittance was greatly reduced.

[0011] The ultraviolet light having a wavelength of 313 nm is easily absorbed by the synthetic resin, and the synthetic resin is discolored or deteriorated by the absorption.

On the other hand, it has been found that ultraviolet light having a wavelength of 365 nm is not always well absorbed by the photocatalytic film because of its large wavelength.

As described above, when a high-pressure sodium lamp is used as a light source, it is not always sufficient to obtain a very high dirt decomposition power.

The excitation resonance line of sodium is 330 nm.
Is not a particular problem for solarization.

The high-pressure sodium lamp used for illuminating roads and tunnels is a so-called D line (589 nm, 589.nm), which is a low-pressure sodium lamp which has been used for this kind of application and which is a sodium excitation resonance line.
6 nm), which is continuous light compared to monochromatic light, but the appearance is relatively improved, but is still not sufficiently satisfactory.

According to the present invention, by activating a photocatalytic film using a high-pressure discharge lamp that emits light in a specific wavelength range, the photocatalytic film is activated well while performing desired illumination. A method for cleaning a translucent glass member provided with a photocatalytic film that does not cause coloring of glass, a high-pressure discharge lamp for activating a photocatalytic film used for the same, and a lighting device using the same, particularly for roads and tunnels, and self-cleaning of dirt. An object of the present invention is to provide a lighting device that can be made and that can improve the appearance.

[0017]

According to the first aspect of the present invention, there is provided a method for cleaning a member provided with a photocatalytic film, wherein the photocatalytic film of the member provided with a photocatalytic film has an excitation resonance line within a wavelength range of 340 to 360 nm. By irradiating the light of a high-pressure discharge lamp in which a discharge medium containing a halide of a luminescent metal and a rare gas is enclosed in a light-transmitting hermetic container to activate the photocatalyst film, it adhered to the photocatalyst film of the member It is characterized by decomposing contaminants.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

Photocatalyst Film A "photocatalyst film" is a film containing a photocatalyst substance as a main component, and is used to oxidize or reduce a contaminant adhered to its surface by photocatalysis, decompose and clean it. .

A "photocatalytic substance" is a semiconductor substance that, when irradiated with ultraviolet light and absorbs its light energy, is ionized to generate electrons and holes and exhibit a strong oxidizing and reducing power on the surface of the particles. is there.

As the photocatalytic substance, TiO ₂ (anatase form is effective), WO ₃ , LaRhP ₃ , FeT
iO ₃ , Fe ₂ O ₃ , CdFe ₂ O ₄ , SrTiO ₃ , CdS
e, GaAs, GaP, RuO ₂ , ZnO, CdS, M
oS ₃ , LaRhO ₃ , CdFeO ₃ , Bi ₂ O ₃ , Mo
There are S ₂ , In ₂ O ₃ , CdO, SnO ₂ and the like. These substances can be used alone or in combination of two or more.

Among the above substances, TiO ₂ , WO ₃ , S
rTiO ₃ , Fe ₂ O ₃ , CdS, MoS ₃ , Bi ₂ O ₃ , M
In the case of oS ₂ , In ₂ O ₃ , CdO, etc., since the absolute value of the redox potential in the equivalence band is larger than the absolute value of the redox potential in the conduction band, the oxidizing power is larger than the reducing power, and Deodorizing action by decomposition of compounds,
Excellent antifouling action or antibacterial action.

In terms of raw material costs, TiO
₂ , Fe ₂ O ₃ and ZnO are excellent.

Regarding the member The member is not limited to a light-transmitting or light-blocking member as long as the member is provided with a photocatalytic film on its surface and is arranged so as to activate the photocatalytic film by light irradiation. Even if it is a translucent glass member, any configuration may be used as described later.

When the member is a light-transmitting glass member, the photocatalytic film formed on the member may be arranged so as to be irradiated with light transmitted through the member, or may not be transmitted through the light-transmitting glass member. May be arranged to directly irradiate light.

The photocatalytic film has a thickness of, for example, 0.1 to 2.5.
μm, preferably 2 μm or less, and most preferably 1 μm or less.

Further, the translucent glass member may constitute one component of the lighting equipment. For example, a member such as a light-transmitting glass cover, a chandelier, or a light-transmitting louver.

The light-transmitting glass cover may be a front cover of a lighting device for a tunnel, a lighting device for a road, or a glass globe for a street light. As in the case of the front cover, a non-light-controlling member for simply blocking the luminaire from the outside, or a member such as a glass globe provided with a prism or lens to perform the light-controlling action may be used.

Further, the member may be a window material, a wall material, a tile, or the like which is separate from the lighting fixture and is irradiated with light from the lighting fixture.

High Pressure Discharge Lamp The high pressure discharge lamp requires a translucent airtight container, a discharge medium and discharge generating means as essential components, but other components are provided as necessary.

The translucent airtight container is a container surrounding the discharge, and is made of a material having fire resistance enough to withstand the normal operating temperature of the high pressure discharge lamp, and also transmits visible light of a desired wavelength range generated by the discharge to the outside. If it can be derived,
It can be made of any material. For example, glass such as quartz glass, or ceramic made of polycrystalline or single crystal such as translucent alumina or YAG can be used.

Incidentally, YAG is an yttrium-alumina-garnet-based compound, and its chemical symbol is as follows.

Al ₁₀ Y ₆ O ₂₄ or Al ₅ Y ₃ O ₁₂ (depending on the sintering temperature) Further, in order to extract desired light emission to the outside, the entire light-transmitting airtight container needs to be light-transmitting. However, the light guide window may be partially formed.

The discharge medium contains, as essential elements, a luminescent metal halide and a rare gas having an excitation resonance line within a wavelength range of 340 to 360 nm. As described later, it is possible to add a medium other than these to the discharge medium as needed.

The luminescent metal is a metal which is sealed in a light-transmitting airtight container and emits light in an excited state, and the emitted light can be used for desired illumination.

In contrast, mercury, which is used exclusively for buffering and does not want to use its emission for desired illumination, has an excitation resonance line in the ultraviolet and visible regions. In the present invention, it is not called a luminescent metal.

As the luminescent metal, wavelengths of 340 to 36 are used.
Luminescent metals having no excitation resonance line in the range of 0 mn, such as sodium and dysprosium, can be added to correct the luminous color, color temperature or color rendering of the high pressure discharge lamp as a whole.

Furthermore, a metal that continuously emits light in a wide wavelength range, such as tin, can be used as the luminescent metal.

By the way, the luminescent metal exists as a halide at least inside the hermetic container, but a part of the luminescent metal exists in the form of a simple metal because it is stoichiometrically enclosed in excess of halogen. It is acceptable to do so.

Further, during the manufacturing process of the high-pressure discharge lamp, the lamp can be sealed in a state not in the form of a halide.

As the halogen, iodine, bromine, chlorine and fluorine can be used alone or in a mixture of two or more.

As the rare gas, argon, xenon, or the like can be used. The rare gas mainly acts as a starting gas.

Mercury can be enclosed as buffer vapor. However, if the amount of mercury is large, the excitation resonance line becomes 3%.
Since the generation amount of 13 nm is increased and solarization of soda lime glass or the like is likely to occur, it is desirable not to encapsulate a large amount.

By not enclosing mercury substantially, the vapor pressure of the discharge medium cannot be set to a required value. When the amount of light emission is small, the vapor pressure is relatively high, and the vapor pressure is relatively high in the visible region and 340 to 360 nm. Metals that generate less ultraviolet light in a short wavelength region outside the range, such as aluminum, can be sealed in place of mercury.

The discharge generating means is a means for discharging the discharge medium sealed in the light-transmitting hermetic container and causing the luminescent metal excited by the discharge to emit light.

As the discharge generating means, an electrode sealed in a light-transmitting airtight container (this is called an electrode discharge) or a high-frequency electrode or a high-frequency induction coil disposed outside the airtight container can be used. The latter two are called so-called electrodeless discharge.

In addition, a light-transmitting airtight container can be used by being housed in an outer tube as needed. In this case, a phosphor layer can be formed on the inner surface of the outer tube. By doing so, the emission color can be corrected or the visible light can be increased according to the phosphor used.

In the present invention, since the photocatalytic film is activated by irradiating the photocatalytic film with ultraviolet rays in the range of 340 to 360 nm, solarization does not occur in the case of a translucent glass member even if the irradiation light amount is increased. In the case of a light-shielding property, even a synthetic resin is hardly absorbed by the synthetic resin, so that the synthetic resin hardly undergoes discoloration, deterioration, and the like.

Furthermore, since the wavelength is appropriate, the activation of the photocatalyst film can be sufficiently performed. Therefore, while illuminating with the visible light emitted from the high pressure discharge lamp for activating the photocatalyst film, the dirt attached to the members is decomposed. So-called self-cleaning can be performed.

The high-pressure discharge lamp for activating the photocatalyst film used in the present invention is a so-called metal halide lamp, which emits ultraviolet light in the above-mentioned wavelength range for activating the photocatalyst film to form a luminescent metal constituting a halide. Is very practical because it can be easily realized by selecting.

Further, in order to obtain a desired luminescent color, color temperature and luminescent amount, a halide of another luminescent metal can be used if necessary.

Furthermore, since the occurrence of solarization is suppressed as described above even if the amount of ultraviolet rays is large, this method is suitable for use in places where the amount of dirt is large.

The high pressure discharge lamp for activating a photocatalytic film according to the second aspect of the present invention comprises a light-transmitting airtight container;
a discharge medium containing a halide and a rare gas of a luminescent metal having an excitation resonance line in the range of m and sealed in a light-transmitting hermetic container; and a discharge for causing high-pressure metal vapor discharge of the discharge medium in the light-transmitting hermetic container Generating means;

The present invention has been made by finding a light source suitable for simultaneously activating a photocatalytic film and performing illumination. And, as mentioned in the description relating to claim 1, the wavelength of the generated ultraviolet light is 340-3.
When the thickness is within the range of 60 nm, solarization, discoloration, and deterioration caused by the absorption of ultraviolet rays by the member are suppressed, and the photocatalytic film is effective for activation. This is particularly effective when the photocatalytic film is formed on a translucent glass member.

In addition, the generated visible light is useful for illumination, and if necessary, a visible light having a more desirable spectral distribution can be generated by using a halide of another luminescent metal in combination.

The high pressure discharge lamp for activating a photocatalytic film according to the third aspect of the present invention is the high pressure discharge lamp for activating a photocatalytic film according to the first aspect, wherein the luminescent metal having an excitation resonance line in a wavelength range of 340 to 360 nm is used. , Thallium, thulium, zirconium, cadmium, cobalt, lutetium, iridium, nickel, ruthenium, strontium, and tantalum.

The present invention specifically defines a luminescent metal having an excitation resonance line in a wavelength range of 340 to 360 nm. In particular, thallium emits strong green visible light and ultraviolet light of 352 nm, and is therefore a preferable substance as a discharge medium for a high-pressure discharge lamp for activating a photocatalytic film.

A high pressure discharge lamp for activating a photocatalytic film according to a fourth aspect of the present invention is the high pressure discharge lamp for activating a photocatalytic film according to the second aspect, wherein the discharge medium is substantially free of mercury. .

The fact that mercury is not substantially contained is as follows.

That is, even if mercury is present in the hermetic container, it is generally 1 m per 1 cc of the inner volume of the hermetic container.
means less than g. Also, preferably 0.3 mg
More preferably, it is less than 0.2 mg.

As described above, since the mercury is not substantially sealed in the hermetic container, the excitation resonance line of the mercury is 313 nm.
Can be prevented from actually having a strong influence on the activation of the photocatalytic film.

Thus, in the present invention, by containing substantially no mercury, the excitation resonance line of mercury is 313 nm.
And 365 nm are not substantially contained in the emission spectrum, and when the member made of ultraviolet rays of 313 nm is a translucent glass member, coloring due to solarization does not occur. With this, it is possible to prevent a decrease in the visible light transmittance of the translucent glass member. In the case of synthetic resin, 3
No discoloration or deterioration due to 13 nm ultraviolet rays.

Further, it is extremely advantageous that mercury is not substantially contained, since the treatment of mercury is a problem in environmental measures.

According to a fifth aspect of the present invention, there is provided a lighting apparatus having a light emitting opening, and a high pressure for activating a photocatalytic film according to any one of the second to fourth aspects, which is disposed in the lighting apparatus main body. A discharge lamp; and a translucent glass cover which is disposed in the light projecting opening of the lighting fixture main body and has a photocatalyst film formed on a surface thereof.

In the present invention, the lighting equipment may be used indoors or outdoors.

For indoor use, for example, a ceiling embedded device,
It can be applied to ceiling-mounted fixtures, wall-mounted lights, ceiling hanging lights, etc.

For outdoor use, the present invention can be applied to road lights, tunnel lighting equipment, street lights, and the like.

As described in claim 1, the translucent glass cover includes a cover such as a front cover of a tunnel lighting fixture and a globe of a road light. Also, considering the purpose of use of the light-transmitting glass cover, there is a combination of one for waterproof or drip-proof, one for light distribution control, one for preventing the lamp from being dropped due to breakage of the lamp, and a combination of the above-mentioned ones. It is permissible to have various purposes such as the intended one.

The formation of the photocatalytic film on the translucent glass cover may be on the outer surface, the inner surface, or both the inner and outer surfaces of the lighting fixture.

The lighting fixture of the invention of claim 6 is the lighting fixture of claim 5, wherein the translucent glass cover is made of soda lime glass.

As a translucent glass cover used for lighting equipment, soda lime glass is frequently used mainly because of its economical efficiency. Soda-lime glass is particularly easily absorbed by the 313 nm ultraviolet ray of the excitation resonance line of mercury, and is therefore liable to cause solarization.

However, in the present invention, ultraviolet rays having a wavelength of 340 nm to 360 nm are mainly radiated. Therefore, even if a translucent glass cover using soda lime glass, a decrease in visible light transmittance is not a problem.

A lighting fixture according to a seventh aspect of the present invention is a lighting fixture for roads or tunnels provided with a translucent glass cover made of soda lime glass; a translucent airtight container; at least thallium and sodium halide; A discharge medium containing a rare gas and sealed in a light-transmitting hermetic container, and a discharge generating means for causing high-pressure metal vapor discharge of the discharge medium in the light-transmitting hermetic container; And a high-pressure discharge lamp for use.

In the present invention, since the high-pressure lamp for activating the photocatalytic film contains thallium and sodium halides as luminescent metals, two-color emission of thallium green and sodium orange is obtained, and high luminous efficiency is obtained. And relatively good color rendering, which mainly facilitates identification of the appearance of red color.

Further, the high pressure discharge lamp for activating the photocatalytic film belongs to a so-called HID lamp.
The tunnel lighting device can be used as it is without forming a design change only by forming a photocatalytic film on the translucent glass cover.

[0076]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram showing a first embodiment of the method for cleaning a light-transmitting glass member provided with a photocatalytic film according to the present invention.

In the figure, 1 is a translucent glass member, 2 is a photocatalytic film, 3 is a high-pressure discharge lamp for activating the photocatalytic film, and 4 is a lighting fixture body.

In this embodiment, the front cover of the lighting fixture is self-cleaned using a photocatalytic film.

The translucent glass member 1 is a transparent soda-lime glass flat plate having a thickness of 5 mm, and drip-proof seals a light-emitting opening 4 a formed on the front surface of the lighting fixture body 4. The photocatalyst film 2 is formed on the outer surface.

The photocatalyst film 2 is formed by forming a photocatalyst material having anatase type titanium oxide as a main component to a thickness of 2 μm.

FIG. 2 is a graph showing the absorption characteristics of one embodiment of the photocatalytic film and the transmittance characteristics of the translucent soda lime glass in the method for cleaning a member provided with the photocatalytic film of the present invention.

In the figure, the horizontal axis represents wavelength (nm), and the vertical axis represents absorptance / transmittance (%).

The curve A shows the absorption characteristics of the photocatalyst film. Curve B shows the transmittance characteristics of soda-lime glass.

As is apparent from the figure, soda lime glass transmits ultraviolet rays having a wavelength of 340 nm or more by 60% or more. On the other hand, it is shown that the photocatalytic film absorbs 50% or more of the ultraviolet light in the range of 340 to 360 nm.

On the other hand, the high pressure discharge lamp 3
Emits visible light and ultraviolet light, and mainly ultraviolet light having a wavelength in the range of 340 to 360 nm.

The lamp 3 has a rated power consumption of 110 W by enclosing a halide of thallium, sodium and dysprosium together with a rare gas in a translucent airtight container 3a made of translucent ceramics. . Note that thallium has an excitation resonance line at 353 nm.

Then, the photocatalyst film 2 is irradiated with ultraviolet rays emitted from the high-pressure discharge lamp 3 for activating the photocatalyst film. The irradiated ultraviolet light has a wavelength of 340 to 3 as described above.
Since it is in the range of 60 nm, activation of the photocatalytic film is performed without any problem.

Further, since the translucent glass member 1 does not absorb ultraviolet rays having the above-mentioned wavelengths so much, coloring by solarization does not matter.

Table 1 is a table showing the cleaning effect of the method for cleaning a translucent glass member provided with a photocatalyst film of the present invention against contamination by exhaust gas from a diesel vehicle together with comparative examples.

[0091]

Table 1 0 (hr) 1000 (hr) 5000 (hr) 8000 (hr) The present invention 93% 92% 89% 86% Comparative Example 1 93% 82% 76% 72% Comparative Example 2 93% 91% 82% The translucent glass member is a front glass of a lighting device for a tunnel, and is made of a soda-lime glass plate having an average transmittance of 380 to 780 nm.

In the measurement, a room simulating actual conditions is filled with exhaust gas of a diesel vehicle at an appropriate concentration.
The change in the transmittance of the front glass with respect to the lighting time when the high pressure discharge lamp for activating a photocatalytic film of the present invention was mounted in a tunnel lighting fixture was investigated.

Comparative Example 1 was carried out under exactly the same conditions except that a high-pressure sodium lamp having a rated power consumption of 110 W was used as the high-pressure discharge lamp.

Comparative Example 2 was similarly performed using a mercury lamp having a rated power consumption of 100 W as a high-pressure discharge lamp.

Analysis of the results in Table 1 shows that in the present invention, contamination by exhaust gas hardly adhered due to the photocatalytic effect.

On the other hand, in Comparative Example 1, considerable dirt adhered. In Comparative Example 2, although the dirt due to the exhaust gas was not attached, the transmittance of the front glass was reduced,
Probably due to solarization by ultraviolet rays.

FIG. 3 is a graph showing the spectral distribution in the ultraviolet region of a metal halide lamp containing a thallium halide as a luminescent metal in comparison with that of a high-pressure sodium lamp.

In the figure, the horizontal axis represents the wavelength (nm), and the vertical axis represents the relative power (%).

Curves C and D show the spectral distribution of a metal halide lamp, and curve E shows the spectral distribution of a high-pressure sodium lamp.

The high-pressure sodium lamp has a mercury amount as small as 12% by weight of sodium and an increased sodium vapor pressure.

The metal halide lamp shown by curve C has a halide of sodium-thallium-dysprosium enclosed with mercury.

The metal halide lamp of curve D has a halide of sodium-thallium enclosed with mercury.

Therefore, curves C and D both show spectra at 313 nm and 365 nm, which are resonance lines of mercury, but the power at 313 nm is extremely small as compared with the excitation resonance line of thallium. Each of the excitation resonance lines of mercury at 365 nm has a larger power than 313 nm, but is not effective in activating the photocatalytic film, and there is no particular problem.

On the other hand, in the curve E of the high-pressure sodium lamp, a weak excitation resonance line of sodium appears at 330 nm, but an excitation resonance line of mercury is hardly recognized.

FIG. 4 is a conceptual diagram showing a second embodiment of the method for cleaning a translucent glass member provided with a photocatalytic film according to the present invention.

In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is for cleaning dirt on a window glass.

The translucent glass member 1 is a transparent window glass provided on the wall surface 5 in the room. Actually, it is fitted and attached to the sash, but illustration is omitted.

The photocatalytic film 2 is formed on the inner side of the translucent glass member 1.

The high pressure discharge lamp 3 for activating the photocatalytic film is buried in the ceiling 6 and mounted in the ceiling-mounted luminaire body 7.

Thus, the high pressure discharge lamp 3 for activating the photocatalytic film contributes to indoor lighting as a light source of the ceiling-mounted luminaire 7, but a part of the light is transmitted through the translucent glass member 1 of the window glass.
340 nm-3 in the emitted light
The photocatalytic film 2 is activated by the 60 nm ultraviolet light.
As a result, dirt such as tobacco oil adhered to the inner surface of the translucent glass member 1 of the window glass is cleaned.

FIG. 5 is a front view showing a first embodiment of a high pressure discharge lamp for activating a photocatalytic film according to the present invention.

In the figure, 11 is an arc tube, 12 is a support conductor, 13 is a support band, 14 is an insulating tube, 15 is a conductor frame, 16 is a flare stem, 17 is an outer tube, 18 is a base,
19 is a conducting wire.

The arc tube 11 includes a translucent airtight container 11a, a power supply conductor 11b, electrodes (not shown), and a discharge medium.

The hermetic container 11a is made of translucent alumina ceramics, and has a hollow bulging portion 11a1 at the center and end portions 11a2 and 11a2 integrally extending from both ends of the bulging portion 11a1. And the end part 1
Power supply conductors 11b, 11b made of niobium are hermetically sealed with glass frit and are led out from 1a2.

An electrode shaft is welded to the inner end of each power supply conductor 11b, and an electrode coil (not shown) is attached to the tip of the electrode shaft. The distance between the electrodes is 50 mm.

The discharge medium is the same as that shown in FIG.

The support conductor 12 is welded to the upper power supply conductor 11b in the figure of the arc tube 11 to support the arc tube 11a and to introduce a current.

The support band 13 supports the power supply conductor 11b below the arc tube 11a in an insulating manner via an insulating tube.

The conductor frame 15 is disposed at an interval outside the arc tube 11, supports both ends of the support conductor 12 and the support band 13 by welding, and has an elastic contact piece 15 at the upper end.
a, 15a.

The flare stem 16 has a pair of internal leads 16a and 16b, and one of the internal leads 16a and 16b.
The lower end of the conductor frame 15 is welded to support the arc tube 11 at a predetermined position. The other internal lead 16b
Is connected to a power supply conductor 11b below the arc tube 11 through a conducting wire 19.

The outer tube 17 is formed of a cylindrical T-shaped valve, and a flare stem 16 is sealed to a lower neck portion in FIG. The contact piece 15a of the conductor frame 15 elastically contacts the inner surface near the distal end of the outer tube 17, protects the conductor frame 15 against an externally applied impact, and Hold in place.

The inside of the outer tube 17 is evacuated and evacuated. For this reason, illustration is omitted in the outer tube,
An initial getter and a performance getter are provided. The former is evacuated from the outer tube, and after sealing, is applied with a high frequency and is evaporated to perform an initial getter function. The latter gradually adsorbs impurities released into the outer tube during lighting.

The high-pressure discharge lamp for activating a photocatalytic film having the above structure has a rated lamp power of 110 W.

Next, the examples of the first embodiment of the high pressure discharge lamp for photocatalyst activation of the present invention shown in FIG. 5 are shown in Table 2 together with the high pressure sodium lamp as a comparative example.
This will be described with reference to FIGS. In each case, the lamp power was kept constant at 110 W.

[0126]

[Table 2] No. types of lamps Efficiency Illumination ratio Color temperature Ra UV intensity UV intensity ratio (lm / W) (%) (K) (mW / cm ² ) 1 High-pressure sodium lamp 89.4 100 1790 12.9 0.002 1 2 Na, Tl (TlI0.8mg) 99 110.7 2658 66.5 0.105 52.5 3 Na, Tl (TlI1.2mg) 102.8 115.0 2738 71.3 0.13 65 4 Na, Tl (TlI1.6mg) 103.1 115.3 2950 71 0.202 101 5 Na, Tl, Dy (TlI1 .9mg 119.5 31.3 3378 83.5 0.185 92.5 1 is a high-pressure sodium lamp for comparison,
No. 2-No. 5 shows an embodiment of the discharge lamp for activating the photocatalyst film of the present invention.

In addition, No. In 2-5, all sodium encapsulated 1.2 mg of NaI.

Further, No. The dysprosium in 5 encapsulated 0.7 mg of DyI.

In Table 2, the UV intensity was measured at a position 50 cm from the lamp using a Topcon UV meter (for 350 n).
m).

In FIGS. 6 to 10, the horizontal axis represents the wavelength (nm) and the vertical axis represents the relative power.

FIG. 3 is a graph showing a spectral distribution of a high-pressure sodium lamp of No. 1;

FIG. 2 is a graph showing a spectral distribution in Example 2 of the high pressure discharge lamp for activating a photocatalytic film of the present invention.

FIG. 3 is a graph showing the same spectral distribution.

FIG. 4 is a graph showing the same spectral distribution.

FIG. 5 is a graph showing the same spectral distribution.

In the present invention, as is apparent from Table 2 and FIGS. 7 to 10, intense light emission in orange and green colors is observed. Compared with a high-pressure sodium lamp, the luminous efficiency is higher by 10% or more, the color temperature is higher, the average color rendering index Ra is 60 or higher, and 352 nm which is mainly an excitation resonance line of thallium is obtained.
Ultraviolet rays are generated at least 50 times that of the high-pressure sodium lamp.

As described above, the high-pressure discharge lamp for activating a photocatalytic film of the present invention not only has excellent performance for road and tunnel lighting, but also has a large amount of ultraviolet radiation. An extremely excellent cleaning action can be performed even in a highly soiled and highly soiled place.

FIG. 11 is a front view showing an arc tube in a second embodiment of the high pressure discharge lamp for activating a photocatalytic film according to the present invention.

The luminous tube of this embodiment is also made of translucent ceramic, and the bulging portion 11a1 and the end portion 11a2 of the translucent airtight container 11a are formed in a curved line. The bulging portion 11a1 has a spindle shape.

FIG. 12 is a front view showing an arc tube in a third embodiment of the high pressure discharge lamp for activating a photocatalytic film according to the present invention.

The arc tube of this embodiment is also made of translucent ceramics, and the bulging portion 11a1 and the end portion 11a2 of the translucent airtight container 1a are formed in a curved line in the second embodiment. The same as above, but the bulging portion 11a1
Has an intermediate portion in a cylindrical shape.

FIG. 13 is a perspective view showing a lighting fixture for tunnel in one embodiment of the lighting fixture of the present invention.

In the figure, 21 is an instrument body, 22 is a front frame, 23 is a translucent glass cover, 24 is a lamp socket, 25 is a high pressure discharge lamp for activating a photocatalytic film, and 26 is a reflector.

The apparatus main body 21 is formed by molding a stainless steel plate into a box shape having an opening on the front surface, and mounting brackets 21 on the rear surface.
a.

The front frame 22 is formed by molding a stainless steel plate, and has a light projecting opening 22a in the center, a hinge 22b on one side, and a latch (not shown) on the other side. And it is comprised so that opening and closing is possible at one side part of the front side of the instrument main body 21 by the hinge 22b so that opening and closing is possible, and it is fixed to the closed position by the latch.

The translucent glass cover 23 is waterproofly mounted on the front frame 22 via a silicone rubber packing 23a. The translucent glass cover 23 transmits visible light and at least has a wavelength of 340 to 360.
It has relatively high transmittance characteristics in the ultraviolet region of nm.

Further, a photocatalytic film is formed on the front surface of the translucent glass cover 23.

[0148] The lamp socket 24 is provided in the appliance body 21.

The high pressure discharge lamp 25 for activating the photocatalyst film is
It is mounted on the lamp socket 24 in the fixture body 21. The high-pressure discharge lamp 25 has 340-3
Within a range of 60 nm, a luminous flux of 1000 lm
UV light with an intensity of 0.05 W or more per unit is emitted.

The reflecting plate 26 is provided in the apparatus main body 21, and is configured and arranged so that light emitted from the high-pressure discharge lamp 25 is reflected by the reflecting plate 26 and exhibits required light distribution characteristics. Have been.

On the back side of the reflection plate 26 of the instrument body 21,
Ballasts, terminal blocks, etc. are provided.

Thus, the lighting fixture of the present embodiment is installed in the tunnel via the mounting bracket 21a and used for use, and illuminates the inside of the tunnel.

In addition, at the same time as the illumination, the light emitted from the high-pressure discharge lamp 25 for activating the photocatalytic film is mainly 340 nm to 3 nm.
Ultraviolet rays in the range of 60 nm also enter the photocatalytic film through the translucent glass cover 23 together with the visible light, so that the photocatalytic film is activated by the ultraviolet rays and decomposes organic dirt such as soot and smoke adhering thereto. Clean.

[0154]

According to the first aspect of the present invention, since the photocatalyst film provided on the member is activated by the ultraviolet light having a wavelength of 340 nm to 360 nm, the dirt attached to the photocatalyst film can be cleaned and the ultraviolet light within the above range can be cleaned. Even if the member is a light-transmitting glass member, the absorption by glass is small, so the visible light transmittance of the light-transmitting glass member does not decrease due to coloring by solarization of the glass, and the member is made of synthetic resin or the like. In some cases, it is possible to provide a method for cleaning a member provided with a photocatalytic film that does not cause discoloration or deterioration due to ultraviolet absorption.

According to each of the second to fourth aspects of the present invention, a discharge medium containing a luminescent metal halide and a rare gas having an excitation resonance line within a wavelength range of 340 to 360 nm is sealed in a translucent airtight container. Thus, the wavelengths 340 to 36
An object of the present invention is to provide a high-pressure discharge lamp for activating a photocatalytic film, which emits ultraviolet light of 0 nm and is effective for activating a photocatalytic film and can be used for illumination.

According to the invention of claim 3, thallium, thulium, zirconium, cadmium, cobalt,
By using one or more kinds of luminescent metals selected from the group consisting of lutetium, iridium, nickel, ruthenium, strontium and tantalum, a wavelength of 34
A high pressure discharge lamp for activating a photocatalytic film that generates ultraviolet light having a wavelength of 0 to 360 nm can be provided.

According to the fourth aspect of the present invention, in addition, since the discharge medium is substantially free of mercury, the discharge medium is not affected by ultraviolet rays of 313 nm of the excitation resonance line of mercury, and the photocatalyst film activation which is preferable for environmental measures. For use in a high pressure discharge lamp.

According to the invention of claim 5, it is possible to provide a lighting fixture having the effects of claims 2 to 4.

According to the sixth aspect of the present invention, even if the light-transmitting glass cover is made of soda lime glass which can be obtained at a low cost, the coloration by solarization due to the irradiation of ultraviolet rays is small, so that the transmittance is reduced. It is possible to provide less lighting fixtures.

According to the invention of claim 7, in addition to the fact that sodium and thallium halides are contained in the discharge medium of the high pressure discharge lamp for activating the photocatalyst film, orange and green intense light is emitted, so In tunnel lighting, it is possible to provide a lighting device that simultaneously realizes energy saving and high visibility due to high luminous efficiency.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of a method for cleaning a member provided with a photocatalytic film according to the present invention.

FIG. 2 is a graph showing the absorption characteristics of one embodiment of the photocatalytic film and the transmittance characteristics of the translucent soda lime glass in the method for cleaning a member provided with the photocatalytic film of the present invention.

FIG. 3 is a graph showing a spectral distribution in the ultraviolet region of a metal halide lamp containing a thallium halide as a luminescent metal in comparison with that of a high-pressure sodium lamp.

FIG. 4 is a conceptual diagram showing a second embodiment of the method for cleaning a translucent glass member provided with a photocatalytic film according to the present invention.

FIG. 5 is a front view showing a first embodiment of a high pressure discharge lamp for activating a photocatalytic film according to the present invention.

FIG. 1 is a graph showing the spectral distribution of a high-pressure sodium lamp

FIG. 2 is a graph showing a spectral distribution in Example 2 of the high pressure discharge lamp for activating a photocatalytic film of the present invention.

FIG. 3 is a graph showing the same spectral distribution.

FIG. 4 is a graph showing the same spectral distribution.

FIG. 5 is a graph showing the same spectral distribution.

FIG. 11 is a front view showing an arc tube in a second embodiment of the high pressure discharge lamp for activating a photocatalytic film according to the present invention.

FIG. 12 is a front view showing an arc tube in a third embodiment of the high pressure discharge lamp for activating a photocatalytic film according to the present invention.

FIG. 13 is a perspective view showing a lighting device for a tunnel in one embodiment of the lighting device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Translucent glass member 2 ... Photocatalyst film 3 ... High-pressure discharge lamp for photocatalyst film activation 4 ... Lighting fixture main body 4a ... Light emitting aperture

Claims (7)

[Claims] 1. A discharge medium containing a light-emitting metal halide and a rare gas having an excitation resonance line in a wavelength range of 340 to 360 nm is enclosed in a light-tight hermetic container in a photocatalyst film of a member having a photocatalyst film. A method for cleaning a member provided with a photocatalyst film, comprising irradiating light emitted from a high-pressure discharge lamp and activating the photocatalyst film to decompose contaminants adhered to the photocatalyst film of the member. 2. A light-transmitting airtight container; a wavelength of 340 to 360n.
a discharge medium containing a halide and a rare gas of a luminescent metal having an excitation resonance line in the range of m and sealed in a light-transmitting hermetic container; and a discharge for causing high-pressure metal vapor discharge of the discharge medium in the light-transmitting hermetic container A high pressure discharge lamp for activating a photocatalytic film. 3. The luminescent metal having an excitation resonance line in the wavelength range of 340 to 360 nm is one or more selected from the group consisting of thallium, thulium and zirconium. High pressure discharge lamp for photocatalytic film activation. 4. The high-pressure discharge lamp for activating a photocatalytic film according to claim 2, wherein the discharge medium does not substantially contain mercury. 5. A lighting fixture main body having a light projecting opening; a high pressure discharge lamp for activating a photocatalytic film according to any one of claims 2 to 4 disposed in the lighting fixture main body; A light-transmitting glass cover disposed on the light-projecting opening and having a photocatalytic film formed on a surface thereof; 6. The lighting fixture according to claim 5, wherein the translucent glass cover is made of soda lime glass. 7. A lighting device body for a road or a tunnel provided with a translucent glass cover made of soda lime glass; a translucent airtight container; a translucent airtight container containing at least thallium and sodium halides and a rare gas; A high-pressure discharge lamp for activating a photocatalyst film, which is provided with a discharge medium sealed in the container and discharge generating means for performing high-pressure metal vapor discharge of the discharge medium in the translucent airtight container, and which is mounted in the lighting fixture body. Lighting equipment characterized by doing.