JP3491382B2 - Fluorescent lamps and lighting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to photocatalytic fluorescence.
Lamps and luminaires.

[0002]

2. Description of the Related Art A photocatalyst film made of a substance having a photocatalytic action (for example, TiO ₂ ... Titanium oxide) is integrally formed on the outer peripheral surface (outer surface) of a discharge lamp which is sealed with mercury or the like which emits ultraviolet rays by discharge. There is a known discharge lamp (Japanese Patent Laid-Open No. 1-169866).

In this type of discharge lamp, when the photocatalytic film provided on the outer peripheral surface of the bulb receives the ultraviolet rays emitted from the inside of the discharge lamp, the surface becomes activated and becomes oxidative, and adheres or contacts. It oxidizes and decomposes organic substances to exert deodorizing and antifouling effects. That is, in the atmosphere in which the discharge lamp is installed, deodorization or deodorization of the surrounding area and decomposition of organic components in the atmosphere are performed.

As described above, TiO ₂ exhibits a strong oxidative power when it receives ultraviolet rays.
For example, it promotes the oxidation and decomposition of odor generating substances such as acetaldehyde, methyl mercaptan, hydrogen sulfide, and ammonia. Therefore, it is also attempted to be used for prevention of air pollution, sterilization of various bacteria and germs in the air in hospitals, wastewater treatment in water purification plants, and the like.

The wavelength of the irradiation light that shows the photocatalytic reaction is
It depends on the energy band gap of the material forming the photocatalytic film. For example, the energy band gap of TiO ₂ is
It is 3 eV and corresponds to light energy of 400 nm. Therefore, light of a short wavelength having an energy larger than this value is absorbed by TiO ₂ and exhibits a photocatalytic action. Then, depending on the substance, the value of this energy band gap may become small. Further, since the value of the energy band gap also varies depending on the impurities, the photocatalytic action is not limited to the ultraviolet irradiation.

[0006]

However, the above-mentioned discharge lamp uses the negative glow generated between the cathode and the anode to ionize and excite mercury, and the mercury is emitted from this mercury.
Ultraviolet rays of 185 nm and 254 nm are transmitted through a quartz glass bulb and irradiated on the TiO ₂ film formed on the outer surface (outer peripheral surface). The discharge lamp has the function of an ultraviolet irradiation lamp, but hardly emits visible light because it has no phosphor layer. On the other hand, in the case of fluorescent lamps for general lighting, it is usually considered to prevent ultraviolet rays from being emitted outside the discharge lamp as much as possible, but a slight amount of 365 nm ultraviolet rays, which is the bright line of mercury, is emitted. ing. Utilizing the emitted ultraviolet rays, a film having a photocatalytic action such as TiO ₂ is formed on the outer surface of a fluorescent lamp for general illumination, in addition to the function as a light source for illumination,
Exciting TiO ₂ etc. with ultraviolet rays emitted from a fluorescent lamp,
It is considered possible to have a photocatalytic action. However, when a photocatalyst fine particle film having a photocatalytic action such as TiO _{2 is} formed on the outer surface of a fluorescent lamp for general lighting by a conventional method such as a dipping method, the film strength is weak and the film is easily peeled off. In addition, it is difficult for the photocatalytic film to maintain the catalytic action as desired over a long period of time.

The present invention solves the above problems,
An object of the present invention is to provide a bulb, a discharge lamp, an electrodeless discharge lamp, a fluorescent lamp, and a lighting fixture which sufficiently exhibit a required photocatalytic action and also have a function as a light source for general illumination.

[0008]

Means for Solving the Problems The invention of claim 1 is a translucent airtight container in which a discharge gas is sealed; electrode means for generating an electric discharge in the translucent airtight container; A phosphor layer provided on the inner surface side of the airtight container and emitting light by being excited by ultraviolet rays generated by discharge; photocatalyst fine particles provided on the outer peripheral surface side of the translucent airtight container and having a photocatalytic effect upon receiving light 80-20 is formed in mass% and mixed system containing 20 to 80 wt% binder component, and illumination light source
The fluorescent lamp is provided with a photocatalytic film that acts as a catalyst to transmit visible light so as to function . According to the invention of claim 2, the photocatalyst film has an average particle diameter of 3 to 50 nm.
2. The fluorescent lamp according to claim 1 , wherein the fluorescent lamp is formed of a mixed system of the photocatalyst fine particles and the binder component.

[0009] The invention of claim 3, photocatalyst film according to claim 1 or 2, wherein the transmittance of ultraviolet rays is 10% or more
It is the described fluorescent lamp.

The invention according to claim 4 is the fluorescent lamp according to any one of claims 1 to 3 , characterized in that the photocatalyst fine particles are of titanium oxide type having an anatase type crystal structure.

The invention according to claim 5 is the fluorescent lamp according to any one of claims 1 to 4 , characterized in that the binder component is an inorganic material.

The discharge lamp, the electrodeless discharge lamp and the fluorescent lamp are general lamps for illumination.
The shape thereof may be a straight tube type, or may be a curved tube type such as an annular shape, a U-shape, or a W-U shape. Also,
In the fluorescent lamp, the electrode means may be provided inside the discharge vessel or may be an electrodeless type provided outside the discharge vessel. Furthermore, a mixture of mercury and a rare gas can be used as the discharge gas, but the discharge gas is not limited to these as long as it generates ultraviolet rays by the discharge. Claim 6
The invention of (1) is a lighting fixture comprising: a fixture main body; and the fluorescent lamp according to any one of claims 1 to 5, which is detachably attached to the fixture main body.

According to a seventh aspect of the present invention, a light source; a light control member arranged so as to face the light source; and at least one of a facing surface and an anti-facing surface of the light controlling body to which light from the light source reaches. It is formed as a mixed system containing 80 to 20% by mass of photocatalyst fine particles having a photocatalytic effect upon receiving light and formed on one surface, and functions as an illumination light source.
As described above, the luminaire is provided with a photocatalytic film that transmits visible light .

Examples of the light control body include, but are not limited to, a reflecting mirror and a lens, and at least one of the surfaces is generally a surface on the light source side ( However, if it is made of a material such as quartz that transmits ultraviolet rays, it means that the surface opposite to the light source side (anti-facing surface) may be used.

The invention according to claim 8 is: a light source; an enclosure surrounding the light source; formed on at least one of an inner wall surface and an outer wall surface of the enclosure to which light from the light source reaches; Photocatalyst fine particles 80 that receive light and have photocatalysis
It is made of a mixed system containing 20% by mass and 20 to 80% by mass of a binder component, and emits visible light so as to function as a light source for illumination.
A luminaire comprising a photocatalytic film that transmits light.

Here, the term "enclosure" refers to a reflecting mirror, a light-transmitting lens on the entire surface of the instrument, a glass plate, or the like, and may include one that functions as a light-shielding body.

The photocatalyst film according to the present invention comprises photocatalyst fine particles of a compound (or substance) having a photocatalytic action and a binder component. Here, the fine particles of the compound (or substance) having a photocatalytic action include, in addition to the above-mentioned TiO ₂ , for example, ZnO, WO ₃ , Fe ₂ O ₃ , FeTiO ₃ , SrTiO ₃ , Ce.
O _2, Tb ₂ O _3, MgO, particles such as Er ₂ O _3, or 2 or more but particles mixed system may be mentioned, in particular, TiO ₂ fine particles, more preferably TiO ₂ fine particles of anatase crystalline structure forms. The average particle size of these photocatalyst fine particles is generally selected to be about 3 to 50 nm, preferably about 3 to 20 nm, more preferably about 5 to 7 nm. Further, the photocatalyst fine particles may be combined with other metal oxide fine particles, for example, in the case of a composite type in which ZnO fine particles are deposited on the TiO ₂ fine particle surface in a mass ratio of about 0.5 to 2%, TiO ₂ fine particles Oxidation / decomposition of organic substances and deodorization of ZnO particles are performed at the same time. On the other hand, examples of the binder component include alkali silicates such as sodium silicate, inorganic colloids such as silica sol and alumina sol, metal alkoxides such as tetraethoxysilane, phosphates such as aluminum phosphate, and transparent fluororesins. These are one kind. Alternatively, a mixture of two or more kinds can be used. And the mixing ratio of this binder component is generally
It is about 20 to 80% by mass (therefore, the photocatalyst fine particle component is about 80 to 20% by mass), and preferably 30 to 70% by mass. Here, the binder component, which contributes to the adhesion to the surface of the translucent airtight container, on the other hand, from the viewpoint of not impairing the ultraviolet transmissivity and photocatalytic action,
The composition ratio is determined within the above range according to the usage environment of the discharge lamp or the fluorescent lamp.

The thickness of the photocatalyst film is generally 0.
It is about 1 to 100 μm, preferably 0.5 to 30 μm, and more preferably about 1 to 15 μm. The photocatalyst film formed of the binder component and the photocatalyst fine particles performs the photocatalytic action only when the ultraviolet rays transmitted to the outer surface of the light-transmitting hermetic container reach the surface of the photocatalyst film. Therefore, since it is premised that sufficient ultraviolet rays exhibiting a photocatalytic action pass through the photocatalytic film, it is desired that the transmittance of ultraviolet rays be at least about 10%. From this point of view, the film thickness of the photocatalyst film is determined by the average particle size of the photocatalyst fine particles, the kind of binder component (binder function), the mixture composition ratio of these, and the like.

Such a photocatalytic film can be formed by the following method. (a) For example, when Si (EtO) ₄ (tetraethoxysilane ... Et is an ethyl group) is used as the material for the binder component, Si (EtO) ₄ is made into a solution, and photocatalyst fine particles are dispersed / suspended in this solution. Can be formed by coating and drying. Alternatively, (b) the photocatalyst fine particles and a small amount of the binder component fine particles may be applied and dried, and if necessary, fired to form a porous structure.

[0020]

[Action]

The inventors of the present invention form a coating of a TiO ₂ (titanium oxide, titania) -based film having SiO ₂ (diamond oxide, silica) as a binder component on the outer peripheral surface side of a light source tube such as a discharge lamp. As a result of repeated studies on the photocatalytic action in this form, the photocatalytic film state and the like greatly influence the catalytic action, and when the mixing ratio of the photocatalytic fine particles having the catalytic action and the binder component is selected as described above, the peeling resistance is It was found that the catalytic action is effectively performed while having

According to the first aspect of the invention, due to the proper selection of the composition ratio of the photocatalyst fine particles and the binder in the photocatalyst film, the required catalytic action is performed on the outer peripheral surface of the fluorescent lamp, and there is a risk of peeling. Since it disappears, it functions as a light source for lighting that sterilizes and oxidizes and decomposes organic substances for a long period of time. The present inventors have proposed a light source tube body such as a discharge lamp.
On the outer peripheral surface side of, for example, SiO ₂ (diamond oxide, silica)
TiO ₂ (titanium oxide, titania) based binder
Study the photocatalytic action in the form of coating the film of
As a result of stacking, the state of the photocatalyst film greatly affects the catalytic action.
In addition, the photocatalyst particles having a catalytic action and the binder are formed.
When the mixing ratio of minutes is selected as described above, peel resistance
Found that the catalytic action is effectively performed while having
It was

According to the second aspect of the invention, since the particle size of the photocatalyst fine particles in the photocatalyst film is properly selected, a desired catalytic action is performed on the outer peripheral surface of the fluorescent lamp, and there is no fear of peeling. It also functions as a light source for lighting that sterilizes and oxidizes and decomposes organic substances over a long period of time.

According to the invention of claim 3 , the action described in the case of claim 1 or claim 2 is more effectively performed because the ultraviolet transmittance of the photocatalyst film is 10% or more. In the invention of claim 4 , since the particles of TiO _{2 having} the anatase type crystal structure are selected as the photocatalyst fine particles, the photocatalytic action described in the case of claim 1 , claim 2 or claim 3 is further promoted. The present inventors have proposed a discharge lamp.
For example, on the outer peripheral surface side of the light source tube, for example, SiO ₂ (oxide
TiO ₂ (titanium oxide ) with binder
, Titania) -based film is formed by coating, and photocatalytic
As a result of repeated studies on applications, the state of the photocatalyst film etc.
Of photocatalyst particles that have a catalytic effect
When the particle size is selected as above, it has no peeling resistance.
Have found that the catalytic action is effectively performed.

In the invention of claim 5 , since the inorganic type is selected as the binder component, the durability of the photocatalyst described in the case of claim 1 , claim 2 , claim 3 or claim 4 is promoted.

According to the invention of claim 6 , since it has a configuration including a bulb, a discharge lamp, an electrodeless discharge lamp or a fluorescent lamp, which exhibits the action described in the case of claims 1 to 5 , It can also be used as a light source for general lighting to deodorize and sterilize (sterilize).

According to the invention of claim 7 , at least one of the facing surface and the anti-facing surface of the light control body not only exhibits the excellent durability and good photocatalytic action as described above, but also has an optical property. Since the characteristic properties are not impaired, it is possible to perform cleaning of the peripheral portion while functioning as a high-quality lighting fixture.

In the invention of claim 8 , at least one of the inner wall surface and the outer wall surface of the enclosure not only exhibits the excellent durability and good photocatalytic action as described above, but also has optical characteristics. Since it does not get damaged, it can function as a high-quality lighting fixture while cleaning the surrounding area.

[0029]

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

Example 1 This example is a case of a three-wavelength emission type straight tube fluorescent lamp. FIG. 1 (a) is a perspective view of the straight tube fluorescent lamp, and FIG. 1 (b) is a partially enlarged view. FIG. 2 is a side view showing a schematic configuration of a lighting fixture using a straight tube fluorescent lamp.

The main body of the fluorescent lamp is a low-pressure mercury vapor discharge lamp with a rated power of 37 W, which is designated as FL40SS in JIS standard, and 1 is a light emitting tube as a light-transmitting hermetic container having a straight tube shape. Tube 1 has a valve outer diameter of 28 mm and a tube length of 1198
It is made of glass having a size of about mm and transmitting ultraviolet rays of 300 nm or more, for example, soda lime glass. Both ends of the arc tube 1 are sealed by stems 2 and 2 and lead wires 3 and 3 are hermetically penetrated through the stems 2 and 2. In addition, the lead wires 3 and 3 are formed by a tungsten wire or the like into a double coil, and filament electrodes 4 and 4 as electrode means.
Is attached, and an emitter (not shown) is applied.

Further, the outer peripheral surface (outer surface) of the arc tube 1
A photocatalytic film 5 is formed on the entire surface of the. here,
The photocatalyst film 5 is made of, for example, TiO ₂ (titanium oxide) or Zn.
It is formed of O (zinc oxide) or the like, and in this embodiment, it is formed of anatase-type TiO ₂ fine particles and SiO ₂ fine particles (binder component) having an average particle diameter of 20 nm or less (for example, 5 to 7 nm). The photocatalyst film 5 containing TiO ₂ as a main component can be formed as follows. For example, TiO ₂ powder and SiO ₂ powder having an average particle size of 5 to 7 nm are dispersed in a mixed solvent of butyl acetate-butyl alcohol, and the suspension is prepared by immersing the fluorescent lamp on the outer peripheral surface (outer surface). average
A photocatalytic film 5 having good peeling resistance is formed on the outer surface of the arc tube 1 by applying a film having a thickness of 1 μm and drying (holding at 150 ° C. for about 5 minutes).

Further, in this embodiment, the phosphor layer 6 which is excited by the ultraviolet rays emitted from mercury to be converted into visible light.
Is composed of a mixture of, for example, a three-wavelength light-emitting phosphor and a phosphor that is excited by ultraviolet rays emitted from mercury to emit ultraviolet rays of 300 nm to 400 nm. Here, 3 is the wavelength emitting fluorescent substance, for example, Y ₂ O ₃ as the red-based phosphor having a peak wavelength around 610 nm: Eu, as a green phosphor having a peak wavelength around 540 nm (La, Ce , Tb) PO ₄ , 450nm
BaMg ₂ Al ₁₆ as a blue phosphor with a peak wavelength in the vicinity
O ₂₇ : Eu is used. Europium-activated alkaline earth metal borate is used as the ultraviolet light emitting phosphor. Examples of the europium-activated alkaline earth metal borate include Sr, B ₄ , O ₇ : E having a peak wavelength at 368 nm.
u ²⁺ is effective, and (Ba, Sr, Mg) ₃ Si ₂ O ₇ : Pb ⁺ having a peak length at 370 nm and BaSi ₂ O ₅ : Pb ² having a peak wavelength at 350 nm are used as lead activated silicates. ⁺ Is suitable, and (Ca, Zn)
₃ (PO ₄ ) ₂ : Tl, Ca ₃ (PO ₄ ) ₂ : Tl, Y PO ₄ : Ce, La P
O ₄ : Ce can also be used. In the examples, Sr, B ₄ , O ₇ : Eu is used as the ultraviolet light emitting phosphor, and the mixing ratio thereof is 1 to 10 mass% of the phosphor layer 6.

Further, a predetermined amount of mercury and an inert gas such as argon gas are enclosed in the arc tube 1, and a cap 8 having a cap pin 7 projecting from the end of the arc tube 1, 8 is worn. Then, the base pin 7 is connected to the filament electrode (discharge electrode) via the lead wire 3.
4 and 4 are connected.

The fluorescent lamp 9 having the above-mentioned structure is shown in FIG.
The luminaire can be constructed by attaching to the luminaire main body as shown in FIG. That is, in FIG. 2, reference numeral 10 denotes a main body of a ceiling-mounted lighting fixture, and lamp sockets 11, 11 are arranged to face each other at both longitudinal ends of the lighting fixture main body 10. The fluorescent lamp 9 is attached between the sockets 11 and 11 by engaging the cap pins 7 of the caps 8 and 8 to form a lighting fixture. In addition, the lighting device main body 10 has a ballast for turning on the fluorescent lamp 9.
A lighting circuit including 12 is accommodated, and the fluorescent lamp 9
Is illuminated via ballast 12.

Next, the operation of the fluorescent lamp and the two lighting fixtures having the above construction will be described.

When the fluorescent lamp 9 is turned on, mercury vapor is generated at 185 nm and 2 peculiar to mercury due to arc discharge between the electrodes 4 and 4.
It emits an ultraviolet ray of 54 nm, and this ultraviolet ray excites the fluorescent layer 6. In this case, the phosphor layer 6 is a three-wavelength light emitting phosphor and
Since the phosphors that emit UV light of 300 nm to 400 nm are formed of a mixture, the three-wavelength light-emitting phosphor emits visible light having a peak wavelength in three wavelength regions, and the UV light-emitting phosphor emits UV light of 300 nm to 400 nm. Emit. Then, the visible light emitted by the three-wavelength emission type phosphor is transmitted through the wall of the arc tube 1, is transmitted through the titanium oxide film 5, and is emitted to the outside.
Since a predetermined amount of visible light is obtained, it is possible to illuminate with a predetermined brightness.

On the other hand, since the ultraviolet-emitting phosphor emits ultraviolet rays of 300 nm to 400 nm, this ultraviolet ray penetrates the wall of the arc tube 1 and reaches the photocatalytic film 5 containing TiO ₂ as a main component. For this reason, TiO ₂ absorbs ultraviolet rays and produces electrons and holes inside TiO ₂ by photocatalysis, and at the same time, the holes move to cause an electron transfer reaction on the surface, and these holes are almost equal to the band gap (3.0 eV). It has a power to extract electrons by the energy of, that is, an oxidizing power, and oxidizes a substance attached to the surface. Therefore, it functions to more efficiently oxidize and decompose odors and organic substances that pollute the environment. For example, odor (acetaldehyde concentration 1300
When the lighting device is turned on in a closed type atmosphere with (ppm) and the changes in lighting time and acetaldehyde concentration are measured, it shows an excellent catalytic function of about 300 ppm after 1 hour and about 5 ppm after 24 hours. It was confirmed.

As described above, the photocatalyst film 5 containing TiO ₂ fine particles as a main component efficiently oxidizes substances adhering to the surface.
Since it can be decomposed, the decomposition of, for example, sulfur compounds such as methyl mercaptan and hydrogen sulfide, nitrogen-containing compounds such as ammonia, and aldehydes is promoted, and the deodorizing effect due to the decomposition of odorous substances is easily achieved. In addition, similarly, due to the strong oxidizing action, a bactericidal action of various bacteria including bacteria, a purification of dirt and the like, an action of decomposing a tar of a cigarette, for example, easily occur. That is, the fluorescent lamp 10 emits a large amount of visible light as a light source for illumination and also functions as an ultraviolet ray generation source for the TiO ₂ film 5 coated on the surface. Therefore, lighting of a living space such as a house or office and air purification can be realized by a single fluorescent lamp, and a comfortable living environment can be obtained. In addition, even if dust, cigarette tar, or oil and fat components try to accumulate on the outer surface of the fluorescent lamp, the TiO ₂ film 5 prevents the deposition of these substances by the oxidative decomposition action, thus preventing the luminous flux of the fluorescent lamp from decreasing. Therefore, it is not necessary to clean the fluorescent lamp, and maintenance is easy.

Example 2 An annular fluorescent lamp was prepared through the steps of bending, exhausting, and sealing, and the annular fluorescent lamp was sealed with the sealing portion facing upward.
Immerse and remove the TiO ₂ fine particles with an average particle size of 5 to 7 nm and a small amount of SiO ₂ fine particles in the dispersion, remove the product, and then hold it at 150 ° C for about 5 minutes with the sealing part turned upside down. A TiO ₂ -based photocatalytic film was formed on the outer peripheral surface of the circular fluorescent lamp.

The thickness of the photocatalyst film provided on the outer peripheral surface of this annular fluorescent lamp is 1 μm on average on the outer peripheral surface of the bent portion,
The average value was 0.7 μm on the inner surface of the bent part and 0.8 μm on the sealing part side.

Next, the annular fluorescent lamp provided with the photocatalyst film on the outer peripheral surface of the arc tube was incorporated into a corresponding lighting fixture, and the deodorizing effect was examined in the same manner as in Example 1. Similar action and effect was observed.

Further, when a certain amount of cigarette tar was applied over the photocatalyst film on the outer peripheral surface of the annular fluorescent lamp and the photocatalytic action was compared by the time before becoming colorless, it was easily affected by heat. The photocatalytic action in the sealing part (near the electrode) is
It was about twice that of other areas. Although the case of the annular fluorescent lamp has been described above, a U-shaped fluorescent lamp as shown in plan view in FIG. 3 (a) and a perspective view as shown in FIG. 3 (b) or 3 (c). Similar effects were observed when the photocatalytic film was formed and provided on the outer peripheral surface of the arc tube of the W-U type fluorescent lamp in accordance with the above.

Example 3 In the straight tube fluorescent lamp of Example 1, as the TiO ₂ fine particles in the photocatalyst film 5, ZnO long fine particles having an average particle size of about 10 nm and attached and deposited (mass) were used. A photocatalytic film 5 was formed on the outer surface of the arc tube 1 under the same conditions as in Example 1 except that the ratio of about 1% was used. This photocatalyst film 5
Shows excellent peeling resistance without peeling from the outer surface of the arc tube 1 even when the surface is wiped with a dry cloth.

Further, the deodorizing effect was examined in the same manner as in the case of Example 1 by incorporating it in a lighting fixture corresponding to this straight tube fluorescent lamp, and the same effect as in the case of Example 1 was recognized.

Further, when the photocatalyst film as exemplified above is formed on the outer peripheral surface of the bulb of a discharge lamp having a discharge medium such as mercury sealed in place of the fluorescent lamp in each of the above-mentioned embodiments, the photocatalyst film is resistant to the photocatalyst film. It has good releasability and maintained and exhibited the required photocatalytic action over a long period of time.

The present invention is not limited to the structure of the above embodiment. That is, although the three-wavelength light-emitting phosphor is used as the phosphor that emits visible light in the above-mentioned embodiment, the present invention is not limited to this, and calcium halophosphate phosphor and
Ordinary phosphors used in other fluorescent lamps may be used. Further, the fluorescent lamp is not limited to a straight tube fluorescent lamp, a ring fluorescent lamp, a U-shape, a W-shape, and may be a bent fluorescent lamp such as an H-shape or a saddle shape.

Example 4 First, a halogen bulb shown in FIG. 4 with a partly cutaway section was prepared. In FIG. 4, 13 is a bulb made of quartz glass, 14 is a crush-sealing portion 14a, 14b of the bulb 13, and a pair of introducing lead wires (electricity introducing means) 15a is hermetically embedded in the crush-sealing portion 14. , 15b are inner conductors whose one ends are connected to the lead wires 14a, 14b, 16 is a tungsten coil filament mounted between the inner conductors 15a, 15b, and 17 is electrically connected to the lead wires 14a, 14b. While crushing sealing part 14
It is a base attached to.

Next, regarding the halogen bulb having the above structure,
The photocatalytic film 18 was formed on the outer surface of the bulb 13 by treating under the same conditions as in Example 1. The photocatalyst film 18 did not peel off from the outer surface of the bulb 13 even if the surface was wiped with a dry cloth, and showed excellent peeling resistance. Further, when the deodorizing effect was examined in the same manner as in the case of Example 1 by incorporating it in a lighting fixture corresponding to this halogen bulb, the same effect as in the case of Example 1 was recognized.

Embodiment 5 FIG. 5 is a cross-sectional view showing a schematic structure of a lighting device in which a light source for emitting ultraviolet rays, for example, a high pressure mercury vapor discharge lamp is combined with a light control body (or an enclosure). In FIG. 5, 19
Is a device body in which an external lead portion 20 and a socket portion 21 whose one end is connected to the power source side are mounted. Further, 22 is a high-pressure mercury vapor discharge lamp mounted in the socket portion 21 of the instrument body 19, 23 is a reflector arranged and installed along the high-pressure mercury vapor discharge lamp 22, and the reflector 23 is the instrument. It is supported and fixed by a support frame 24 attached to the main body 19. Further, reference numeral 25 is an ultraviolet-transparent globe, for example, a quartz glass globe, which is combined with the device body 19 to form an enclosure, and a photocatalyst film 26 is provided on the outer surface thereof. Here, the photocatalyst film 26 is used in the second embodiment.
Tetraisopropyl titanate and TiO ₂ super powder solution or suspended solution of the same composition as in, applied to the outer surface of the quartz glass globe 25, dried in air at about 700 ° C.
It is baked for 5 minutes to form a film thickness of about 0.5 μm.

In the luminaire constructed as described above, when the high-pressure mercury vapor discharge lamp 22 is turned on, the ultraviolet rays emitted from the high-pressure mercury vapor discharge lamp 22 pass through the quartz glass globe 25 and the outer surface (outer periphery) surface is exposed. Upon arrival, it was confirmed that the photocatalytic film 26 exhibits an active function / action as a photocatalyst. That is, aceto Alte hydrate concentration in the organic gas (1300 ppm)
In the above atmosphere, the above-mentioned lighting equipment was turned on, and the change / reduction in the concentration of acetoartehide with the passage of lighting time was measured, and an excellent photocatalytic action was observed.

In the above examples, TiO ₂ (titanium oxide) and ZnO (zinc oxide) were given as examples of the substance exhibiting a photocatalytic action. For example, Fe ₂ O ₃ (iron oxide) and FeTiO ₃
(Iron titanate), SrTiO ₃ (strontium titanate),
CeO ₂ (cerium oxide), Tb ₂ O ₃ (terbium oxide), MgO
(Magnesium oxide), Er ₂ O ₃ (erbium oxide), or a mixed system of two or more thereof, as a binder component sodium silicate (eg, alkali silicate), inorganic colloid (eg, silica sol, alumina sol), metal alkoxide (eg, Similar results are observed even when a form using a tetraethoxysilane), a phosphate (for example, aluminum phosphate), a transparent fluororesin, or the like is adopted.

[0053]

According to the inventions of claims 1 to 8 , the required photocatalytic action is performed on the outer peripheral surface of the light source tube, and the photocatalytic film is not likely to peel off. Fluorescent lamps and lighting that also oxidize and decompose
We can provide lighting equipment .

According to the invention of claim 1 , the required photocatalytic action is performed on the outer peripheral surface of the fluorescent lamp, and the photocatalytic film is not likely to be peeled off.
It is possible to provide a fluorescent lamp that also oxidizes and decomposes organic substances.

According to the invention of claim 2 , the required photocatalytic action is performed on the outer peripheral surface of the fluorescent lamp and the photocatalytic film is not likely to peel off.
It is possible to provide a source fluorescent lamp that also oxidizes and decomposes organic substances.

According to the invention of claim 3 , it is possible to provide a fluorescent lamp with improved reliability according to claim 1 or 2 .

According to the invention of claim 4 , it is possible to provide a fluorescent lamp in which the photocatalytic action of claim 1 , claim 2 or claim 3 is further promoted.

According to the invention of claim 5 , it is possible to provide a fluorescent lamp in which the durability of the photocatalyst of claim 1 , claim 2 , claim 3 or claim 4 is promoted.

According to the invention of claim 6 , it is possible to perform deodorization, sterilization (sterilization), etc. while using it as a light source for general illumination.

According to the inventions of claims 7 and 8 , deodorization, sterilization (sterilization) and the like can be performed while being used as a light source for general illumination.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (a) is a partially cutaway perspective view of a straight tube type fluorescent lamp, and (b) is a partially enlarged sectional view of (a).

FIG. 2 is a side view of an illumination device using the straight tube fluorescent lamp of the above embodiment.

FIG. 3 shows a modified example of the second embodiment of the present invention, (a)
Is a side view of the U-shaped fluorescent lamp, (b) is a side view of the WU-shaped fluorescent lamp, and (c) is a side view of another W-U-shaped fluorescent lamp.

FIG. 4 is a partially cutaway sectional view of a halogen light bulb showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a schematic main part of a discharge lamp device showing a fourth embodiment of the present invention.

[Explanation of symbols]

1,13 …… Translucent airtight container (light emitting tube) 5,18 ... Photocatalyst film 6 ... Phosphor layer 9: Straight tube fluorescent lamp 10: Lighting equipment body

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-169866 (JP, A) JP-A-3-20955 (JP, A) JP-A-6-181056 (JP, A) JP-A-6- 304237 (JP, A) JP-A-6-327965 (JP, A) JP-A-63-5304 (JP, A) Actual Kaihei 3-30314 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 61/35 H01J 65/04

Claims (8)

(57) [Claims] 1. A translucent airtight container having a discharge gas sealed therein; electrode means for generating an electric discharge in the translucent airtight container; provided on an inner surface side of the translucent airtight container, and A phosphor layer that emits light when excited by ultraviolet rays generated by discharge; photocatalyst fine particles 80 to 20% by mass and a binder component 20 to 80, which are provided on the outer peripheral surface side of the translucent airtight container and have a photocatalytic action upon receiving light It is formed by a mixed system containing mass%, irradiation
A fluorescent lamp comprising: a photocatalytic film that transmits visible light so as to function as a light source for light . 2. A photocatalytic film fluorescent lamp according to claim 1, characterized in that it is formed by a mixed system of photocatalyst particles and a binder component having an average particle diameter of 3 to 50 nm. 3. The fluorescent lamp according to claim 1, wherein the photocatalytic film has a transmittance of ultraviolet rays of 10% or more. It wherein the photocatalyst particles claims 1, characterized in that a titanium oxide of the anatase crystalline structure 3
The fluorescent lamp according to any one of the above . 5. The fluorescent lamp according to claim 1, wherein the binder component is an inorganic material. 6. instrument body and; claims 1 detachably mounted on the instrument body 5
A fluorescent lamp according to any one of claims 1 to 3; 7. A light source; a light control body arranged so as to face the light source; and at least one of a facing surface and an anti-facing surface of the light control body to which light from the light source reaches. Formed in a mixed system containing 80 to 20% by mass of photocatalyst fine particles having a photocatalytic effect upon receiving light and 20 to 80% by mass of a binder component,
A lighting device comprising: a photocatalytic film that transmits visible light so as to function as a light source for lighting. 8. A light source; an enclosure surrounding the light source; a photocatalyst formed on at least one of the inner wall surface and the outer wall surface of the enclosure to which the light from the light source reaches It is formed by a mixed system containing 80 to 20 wt% photocatalyst particles and 20 to 80 wt% binder component having an effect, irradiation
A lighting fixture comprising: a photocatalyst film that transmits visible light so as to function as a light source for light .