JP2002110097A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of covering a photocatalyst film on an outer periphery surface by a relatively easy method. SOLUTION: The fluorescent lamp is provided with a bulb 1 in which a fluorescent material layer 7 is formed on an inner surface and a discharge medium is filled; a translucent film 5 covered on an outer periphery of this bulb 1; a backing layer 5a mainly containing a silicon compound formed on the translucent film; and photocatalyst film 6 mainly containing an ultra-fine particle formed on this backing layer 5a. Since the photocatalyst film 6 is covered on an outer periphery surface after the translucent film 5 is formed on the outer periphery surface without directly forming the photocatalyst film 6 on the outer periphery surface of the bulb 1a, a film-forming becomes easy. Since the backing layer 5a is formed on the translucent film 5, it is inhibited that the translucent film 5 itself is oxidized and decomposed by photocatalytic action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluorescent lamp with a photocatalytic film.

[0002]

2. Description of the Related Art A fluorescent lamp with a photocatalytic film in which a photocatalytic film such as titanium oxide is formed on the outer peripheral surface of the fluorescent lamp is disclosed in Japanese Patent No.
As described in Japanese Patent No. 5727, an organic compound attached to the surface is decomposed by an oxidizing action of a photocatalyst that has received near-ultraviolet light included in light emitted from a fluorescent lamp. It is hard to adhere, and has the effect of deodorizing because it decomposes the odor source in the air.

[0003] Japanese Patent Application Laid-Open No. 11-283563 discloses a fluorescent lamp in which a photocatalytic film is formed on the outer peripheral surface of a bulb so that a photocatalytic film is not formed on a base pin. This is to prevent the base pin and the base member from being decomposed by the oxidizing action of the photocatalyst.

[0004] In this prior art fluorescent lamp, a photocatalytic film is formed as follows. First, a straight tubular valve with a mask applied to a base or a straight tubular valve before the base is attached is suspended, and the photocatalytic film coating agent is applied from the upper end of the valve while rotating the valve around the pipe axis. Apply by flowing down. Thereafter, a photocatalytic film is formed through a drying step.

[0005]

However, the method of applying the photocatalyst film coating agent by flowing down the photocatalyst film coating while the straight tube bulb is suspended as in the above-mentioned conventional fluorescent lamp is not suitable for mass production, Since the thickness of the film was also likely to be non-uniform, the film formability was poor.

Further, in the conventional fluorescent lamp, a photocatalytic film can be formed on a straight tube fluorescent lamp, but it is not suitable for forming a photocatalytic film on a ring-shaped fluorescent lamp.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a fluorescent lamp capable of applying a photocatalytic film to an outer peripheral surface by a relatively easy method.

According to a first aspect of the present invention, there is provided a fluorescent lamp comprising: a bulb in which a phosphor layer is formed on an inner surface and a discharge medium is sealed; and a translucent film attached to an outer peripheral surface of the bulb. An underlayer mainly composed of a silicon compound formed on the light-transmitting film; and a photocatalytic film mainly composed of ultrafine particles of titanium oxide formed on the underlayer. .

In each of the above claims and the following claims, definitions of terms are given in the following description, unless otherwise specified.

The bulb is made of soda lime glass, lead glass,
Any glass for the bulb, such as borosilicate glass or barium silicate glass, may be used.

The light-transmitting film can be attached to the outer peripheral surface of the bulb and needs to transmit at least near ultraviolet rays (wavelength: 300 to 400 nm) other than visible light.

The light-transmitting film may be in any form, such as a sheet or a tube, before the valve is attached. Although there is no particular limitation on the material, in general, P
Synthetic resins such as ET (polyethylene terephthalate) and fluororesin can be used.

The amount of near ultraviolet light transmitted by the translucent film may be selected according to the oxidizing and decomposing ability of the photocatalyst film described later, and is not particularly limited. In particular, the thickness and the material of the light-transmitting film affect the transmission amount of near-ultraviolet light, and thus are selected according to the desired oxidation and decomposition ability of the photocatalytic film.

An underlayer mainly composed of a silicon compound is formed on the translucent film, and a photocatalytic film is formed on the surface of the underlayer. The translucent film on which the underlayer and the photocatalyst film are formed is attached to the outer peripheral surface of the bulb so that the photocatalyst film is exposed to the outside.

As a method for applying the light-transmitting film, an adhesive may be used. Alternatively, the light-transmitting film may be applied using an attraction force, a contraction force or the like of the light-transmitting film itself.

The photocatalyst film is mainly composed of titanium oxide (TiO ₂ ) and is composed of ultrafine particles of titanium oxide. Here, “ultrafine particles” means that the average primary particle size is 50%.
It means fine particles of nm or less.

Titanium oxide is most suitable for the photocatalytic film from the viewpoints of photocatalytic effect and production cost. However, if the photocatalytic film has a light transmitting property when formed into a film, for example, WO ₃ , L
aRhO ₃ , FeTiO ₃ , Fe ₂ O ₃ , CdFe ₂ O ₄ , S
Fine particles of a compound having a photocatalytic action, such as rTiO ₃ , CdSe, GaAs, GaP, RuO ₂ , or a mixture of two or more kinds of fine particles, or a mixture of these and titanium oxide in an appropriate ratio May be.

The photocatalyst film is formed by adding titanium oxide ultrafine particles to SiO.
It is formed of a binder component such as ₂ . The photocatalytic film is preferably coated with a liquid material that can be formed at a relatively low temperature in consideration of the heat resistance of the translucent film. In particular, it is optimal to use a known photocatalytic coating agent that cures at room temperature. The thickness of the applied photocatalyst film is preferably about 0.01 μm to 1 μm.

The fluorescent lamp can be applied to various types of fluorescent lamps such as a ring shape and a bent shape, in addition to a straight tube, as long as a translucent film can be attached.

The bulb may be provided with an electrode for causing a discharge in the discharge medium. In this case, the electrodes
A hot cathode, a cold cathode, or the like may be an external electrode such as an electric field generating electrode or an induction coil attached to the outer surface of the bulb as long as it causes a discharge.

Further, a base electrically connected to the electrode may be mounted on the bulb as required. The base may have any appropriate structure corresponding to the form of the fluorescent lamp, and may be made of a metal or a plastic such as PBT (polybutylene terephthalate).

The phosphor layer is a white phosphor such as a three-wavelength phosphor or a calcium halophosphate phosphor, but may be a phosphor that generates near ultraviolet light.

According to the first aspect of the present invention, since the photocatalytic film is not formed directly on the outer peripheral surface of the bulb, but is formed on the light-transmitting film and then attached, the film formation is facilitated. Further, since the base layer is formed on the light-transmitting film, the light-transmitting film itself is suppressed from being oxidized and decomposed by the photocatalysis.

According to a second aspect, in the fluorescent lamp according to the first aspect, the light-transmitting film is mainly composed of polyester and Teflon.

By using a film made of a material mainly composed of polyester and Teflon having a relatively high ultraviolet transmittance as the translucent film, the ultraviolet rays emitted from the fluorescent lamp efficiently reach the photocatalytic film.

According to the second aspect of the present invention, it is possible to improve the photocatalytic action of the fluorescent lamp of the first aspect.

A fluorescent lamp according to claim 3 is a bulb in which a phosphor layer is formed on an inner surface and a discharge medium is sealed; and a Teflon resin adhered to an outer peripheral surface of the bulb and mixed with ultrafine particles of titanium oxide. And a photocatalytic film mainly composed of ultrafine particles of titanium oxide formed on the underlayer.

Ultrafine particles of titanium oxide having a photocatalytic action are mixed in the translucent film. However, since the translucent film is made of Teflon resin, the translucent film has excellent ultraviolet transmittance, and the translucent film is oxidized and decomposed by the photocatalytic action. It is hard to be done.
Therefore, it is not necessary to form a photocatalytic film on the translucent film, and the production is easy.

According to the third aspect of the present invention, since the ultrafine titanium oxide particles having a photocatalytic action are mixed in the translucent film, it is possible to provide a fluorescent lamp with a photocatalytic function that does not require the formation of a photocatalytic film. In addition, since the light-transmitting film is formed of Teflon resin, the light-transmitting film itself is suppressed from being oxidized and decomposed by photocatalysis.

According to a fourth aspect, in the fluorescent lamp according to any one of the first to third aspects, the translucent film is formed of a heat-shrinkable tube.

According to the fourth aspect of the present invention, since the operation of applying the light-transmitting film can be performed by performing the heat treatment, the manufacture of the fluorescent lamp is further facilitated.

According to a fifth aspect, in the fluorescent lamp according to any one of the first to fourth aspects, the average primary particle diameter of the titanium oxide ultrafine particles of the photocatalytic film is 4 to 10 nm.

Since the particle size of the titanium oxide ultrafine particles affects the film forming conditions and the photocatalytic action, it is necessary to select a range suitable for the present invention. Was found to be optimal.

According to the fifth aspect of the present invention, since the titanium oxide ultrafine particles having excellent film-forming properties and photocatalytic action are used, the actions of the first to third aspects are remarkably improved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway sectional view schematically showing the fluorescent lamp of the first embodiment, and FIG. 2 is a partially enlarged sectional view.

The fluorescent lamp is FL40SS according to JIS standard.
Is a low-pressure mercury vapor discharge lamp with a constant line power of 37 W, and is a straight tube-shaped bulb. This bulb 1 has an outer diameter of 28 mm, a tube length of about 1198 mm, and a wavelength of about 1198 mm. It is formed of glass that transmits ultraviolet light of 300 nm or more, for example, soda lime glass.
Both ends of the bulb 1 are sealed by stems 2 and 2, and the stems 2 and 2 are connected to lead wires 3 and 3.
Are airtightly pierced. In addition, lead wires 3
Filament electrodes 4 and 4 formed in a double coil with a tungsten wire or the like are attached, and an emitter (not shown) is applied.

On the outer peripheral surface of the bulb 1, a scattering prevention film 5 (shown by a broken line in FIG. 1) as a translucent film is adhered. This scattering prevention film 5
Made mainly of polyester and Teflon,
It is attached to the outer peripheral surface of the bulb 1 by heat shrinking.

The scattering prevention film 5 has a relatively high transmittance at a wavelength of 360 nm of 70 to 85%. Further, the scattering prevention film 5 has a function of preventing the glass pieces from scattering around even when the bulb 1 is broken due to dropping or the like.

As shown in the enlarged sectional view of FIG. 2, an underlayer 5a made of a silicon compound is formed on the shatterproof film 5. A photocatalytic film 6 is formed on the surface of the underlayer 5a.
Are formed.

The photocatalyst film 6 is: It is formed mainly of ultrafine particles of titanium oxide (TiO ₂ ), and mainly consists of ultrafine particles of anatase type titanium oxide having an average primary particle diameter of 0.004 to 0.01 μm. In addition, the photocatalyst film may contain SiO ₂ fine particles as a binder component.

The anti-scattering film 5 may be formed of a Teflon resin mixed with ultrafine particles of titanium oxide. When the ultrafine particles of titanium oxide are mixed into the anti-scattering film 5 in this manner, it is not necessary to form a photocatalytic film, and a fluorescent lamp with a photocatalytic function that can be easily manufactured can be provided.
Further, since the scattering prevention film 5 is formed of Teflon resin, the scattering prevention film 5 itself is suppressed from being oxidized and decomposed by the photocatalytic action.

Reference numeral 7 denotes a phosphor layer formed on the inner surface of the arc tube, which is excited by ultraviolet rays emitted from mercury to convert the light into visible light.

The phosphor layer 7 is mainly composed mainly of a three-wavelength light emitting phosphor. 3 The wavelength emission type fluorescent material, for example Y ₂ O ₃ as the red phosphor having a peak wavelength around 610 nm: Eu, LaPO ₄ as a green phosphor having a peak wavelength around 540 nm: Ce, Tb,
As a blue phosphor having a peak wavelength around _{450nm (SrCaBa) 5 (PO 4} ) 3 Cl: Eu is used.

Further, a predetermined amount of an inert gas such as mercury and argon gas is sealed in the bulb 1 as a discharge medium, and a cap 9 having a cap pin 8 protruding from an end of the bulb 1 is provided. 9 are applied. And cap pin 8
Are connected to the filament electrodes 4 and 4 via the lead wires 3.

The phosphor layer 7 may be constituted by mixing a three-wavelength light-emitting phosphor with an ultraviolet light-emitting phosphor that emits ultraviolet light of 300 to 400 nm when excited by ultraviolet light emitted from mercury. As the ultraviolet light emitting phosphor, at least one or more of europium-activated alkaline earth metal borates, lead-activated silicates, europium-activated alkaline earth metal aluminates, and phosphors in which halogen is added to these are used. Used. As the europium-activated alkaline earth metal borate, for example, Sr ₂ B ₂ O ₇ : Eu ²⁺ having a peak wavelength at 368 nm is effective, and the lead-activated silicate has a peak wavelength at 370 nm ( Ba, S
(r, Mg) ₃ Si ₂ O ₇ : Eu ²⁺ , BaSi ₂ O ₅ : Pb ²⁺ having a peak wavelength at 350 nm, and the like are preferable, and europium-activated alkaline earth metal aluminate is 3
Those having a peak wavelength in the range of 58 to 360 nm are effective.

Next, a method of manufacturing the fluorescent lamp of the present embodiment will be described.

The bulb 1 forms the phosphor layer 7 and fires it.
After the discharge medium is sealed in the bulb 1 through the exhaust process,
The base 9 is attached.

On the other hand, the shatterproof film 5 is processed into a heat-shrinkable tube, coated with a base layer 5a made of a silicon compound, and then coated with a photocatalytic coating agent made of titanium oxide ultrafine particles. Film. These two layers can be dried at room temperature, but may be heated in a temperature range that does not affect the heat shrinkage of the shatterproof film 5. Alternatively, the shatterproof film 5 may be cured by using heating during heat shrink processing.

Then, a scattering prevention film (tube) 5
The shatterproof film 5 is thermally shrunk by inserting a fluorescent lamp into the heater and heating, and the shatterproof film 5 is attached to the outer peripheral surface of the bulb 1.

Next, the operation of the fluorescent lamp of this embodiment will be described.

When the fluorescent lamp is turned on, the arc discharge between the electrodes 4 and 4 causes mercury vapor to have a wavelength of 185 n, which is a mercury emission line.
m, 254 nm, which excites the phosphor layer 7. In this case, the three-wavelength light emitting phosphor of the phosphor layer 7 emits visible light having a peak wavelength in three wavelength regions. Then, the visible light emitted by the three-wavelength light emitting phosphor passes through the bulb 1 and the shatterproof film 5, passes through the photocatalyst film 6 and is radiated to the outside to illuminate to a predetermined brightness.

On the other hand, ultraviolet rays having a wavelength of 365 nm, which are mercury emission lines, are slightly emitted from the arc tube 1 by arc discharge, and the ultraviolet rays pass through the bulb 1 and the scattering prevention film 5 and reach the photocatalytic film 6. The photocatalyst film 6 functions to absorb the ultraviolet rays, generate photocatalytic activity on the surface of the photocatalyst film 6, and efficiently oxidize and decompose odors and organic substances that contaminate the surrounding environment.

According to the fluorescent lamp of this embodiment, it emits the required visible light as a light source for illumination and also functions as an ultraviolet light source for the photocatalyst film 6 applied to the surface.
Lighting and air purification of living spaces such as houses and offices can be realized with a single fluorescent lamp, and a comfortable living environment can be obtained. Further, even if dust, cigarette tar, oil and fat components accumulate on the outer surface of the fluorescent lamp, the oxidative decomposition of the photocatalyst film 6 prevents the adhesion of these substances. On the other hand, since the standard display and the like of the fluorescent lamp are maintained sharply, maintenance is facilitated in combination with prevention of a decrease in luminous flux due to the photocatalytic action and elimination of wiping and cleaning of the fluorescent lamp.

Note that fluorescent lamps having a scattering prevention function are widely used in food processing factories and the like, and there are also problems such as food poisoning caused by the food processing factories. Therefore, the deodorizing and antibacterial effects of the photocatalyst are also attracting attention.

Therefore, by adding the deodorizing and antibacterial functions of the photocatalytic film to the fluorescent lamp having the scattering prevention function, it is possible to simultaneously provide the antibacterial and decomposing effects under such an environment.

According to the first aspect of the present invention, the photocatalytic film is not formed directly on the outer peripheral surface of the bulb, but is formed on the light-transmitting film and then is adhered. Further, since the base layer is formed on the light-transmitting film, the light-transmitting film itself is suppressed from being oxidized and decomposed by the photocatalysis.

According to the invention of claim 2, it is possible to improve the photocatalytic action of the fluorescent lamp of claim 1.

According to the third aspect of the present invention, since the ultrafine titanium oxide particles having a photocatalytic action are mixed in the translucent film, it is possible to provide a fluorescent lamp with a photocatalytic function which does not require the formation of a photocatalytic film. In addition, since the light-transmitting film is formed of Teflon resin, the light-transmitting film itself is suppressed from being oxidized and decomposed by photocatalysis.

According to the fourth aspect of the present invention, since the operation of applying the light-transmitting film can be performed by performing the heat treatment, the manufacture of the fluorescent lamp is further facilitated.

According to the fifth aspect of the present invention, the effects of the first to fourth aspects are remarkably improved because the titanium oxide ultrafine particles having excellent film forming property and photocatalytic action are used.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view schematically showing a fluorescent lamp according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view of a part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bulb, 7 ... Phosphor layer, 5 ... Anti-scattering film as translucent film, 5a ... Underlayer, 6 ... Photocatalytic film.

Claims (5)

[Claims] 1. A bulb in which a phosphor layer is formed on an inner surface and a discharge medium is sealed; a light-transmitting film attached to an outer peripheral surface of the bulb; and a silicon compound formed on the light-transmitting film. A fluorescent lamp, comprising: a base layer as a main component; and a photocatalytic film mainly formed of ultrafine particles of titanium oxide formed on the base layer. 2. The fluorescent lamp according to claim 1, wherein the translucent film is mainly composed of polyester and Teflon (registered trademark). 3. A bulb in which a phosphor layer is formed on an inner surface and in which a discharge medium is sealed;
A translucent film made of Teflon resin mixed with ultrafine titanium oxide particles; and a photocatalytic film mainly composed of ultrafine titanium oxide particles formed on the underlayer. Fluorescent lamp. 4. The fluorescent lamp according to claim 1, wherein the translucent film comprises a heat-shrinkable tube. 5. The photocatalytic film according to claim 1, wherein the titanium oxide ultrafine particles have an average primary particle size of 4 to 10 nm.
5. The fluorescent lamp according to any one of items 4 to 4.