JP2000113856A - Fluorescent lamp and discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp having an excellent luminous flux maintenance factor unavailable in the past. SOLUTION: A protective layer 8 made of inorganic powder is formed between the inner face of the translucent airtight container 1 of this fluorescent lamp and a phosphor film 3. This inorganic powder has the volumetric percentage below 42.5% against the apparent volume of a compact obtained by compression molding at the pressure of 3000 kgf/cm2. When the glass protective layer 8 is made of the inorganic powder satisfying this condition, the barrier function minimizing various damages that the inorganic powder of the glass protective layer 8 causes luminous flux deterioration is exerted, and the preventing effect of luminous flux deterioration can be improved as compared with that in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor film formed in a light-transmitting hermetically sealed container enclosing a discharge medium, and converts ultraviolet light emitted by discharge of the discharge medium into visible light by the phosphor film. The present invention relates to a fluorescent lamp and a discharge lamp lighting device using the same.

[0002]

2. Description of the Related Art Fluorescent lamps are one of the important light sources widely used today. Generally, a fluorescent lamp converts ultraviolet light generated by exciting mercury sealed in a light-transmitting airtight container by discharge into visible light by a phosphor applied on the inner surface of the light-transmitting airtight container, and radiates the fluorescent light. Things.

[0003] In recent years, awareness of global environmental issues has been rising more than ever, and mercury waste used in fluorescent lamps has been increasingly recognized as one of the sources of environmental pollution. Under such circumstances, various approaches for fluorescent lamps have been activated, and for example, many studies have been made on reducing the amount of mercury used in fluorescent lamps and eliminating mercury. Also, studies have been made to save resources by extending the life of the fluorescent lamp.

[0004] First, regarding the non-use of mercury, as a harmless ultraviolet radiation source instead of mercury, for example, there is a rare gas fluorescent lamp using ultraviolet light (main wavelength 147 nm) from xenon discharge. This rare gas fluorescent lamp has excellent features, such as no luminous flux fluctuation due to a change in ambient temperature and a good luminous flux rising characteristic after starting, as compared with a conventional fluorescent lamp using mercury. Although practically used in some applications such as equipment, it is far inefficient compared to a fluorescent lamp using mercury, and at present it is difficult to substitute it in fields such as general lighting.

For this reason, at present, reduction of the amount of mercury used is a practical measure. As a specific measure,
Reduction of the amount of mercury enclosed per lamp (optimization to the minimum required amount), reduction of mercury consumption from a long-term perspective by reducing the frequency of lamp disposal due to improvement of lamp life, etc. .

[0006] First, will be described. The mercury sealed in the translucent airtight container is gradually consumed by the inner surface of the glass bulb and the phosphor that constitute the translucent airtight container as the lighting time elapses. In other words, after mercury is adsorbed on these sites, it reacts with components in glass and phosphors and residual impurities in the translucent airtight container, deposits as various compounds, and can contribute to discharge. It will be invalidated. For this reason, in order to avoid depletion of mercury before the lamp life (rated life), excess mercury is sealed. Therefore, in order to reduce the amount of enclosed mercury, it is necessary to reduce the amount of mercury consumed in the translucent airtight container, that is, to reduce the generation of ineffective mercury.

Next, the above will be described. Generally, the life deciding factors of a fluorescent lamp are: 1) a so-called spot life caused by disconnection of an electrode substrate or consumption of a thermionic emitting material (emitter) applied to the electrode substrate; and 2) a glass bulb or a fluorescent lamp. The so-called luminous flux life, which is caused by discoloration or blackening of the body surface or a decrease in luminous efficiency due to deterioration of the phosphor itself with time, is roughly classified into two. That is, the life of the fluorescent lamp is generally defined by the shorter one of the point life due to electrode breakage and the light flux life due to light flux deterioration.

[0008] Of these, regarding 2), the formation and deposition of compounds due to the reaction of mercury with phosphor components, alkali components in glass or residual impurities in a light-tight hermetic container, and mercury and rare gas It is considered that the phosphor is deteriorated by ion bombardment, and that the phosphor is deteriorated by ultraviolet rays. As a countermeasure, improvement of a phosphor and development of a transparent protective film provided on the inner surface of glass have been performed. However, in a general fluorescent lamp having an electrode (filament) in a light-transmitting hermetic container, there is essentially a limit to the improvement of the above 1), which is a hindrance in improving the life.

From such a viewpoint, in recent years, electrodeless fluorescent lamps having no electrodes in a light-transmitting hermetic container have been particularly spotlighted, and some of them have already been put to practical use. This type of electrodeless fluorescent lamp has a light-transmitting property similar to the above-described fluorescent lamp having electrodes in a light-transmitting airtight container (hereinafter, referred to as an electrodeed fluorescent lamp to distinguish it from an electrodeless fluorescent lamp). Mercury and a rare gas are sealed in the hermetic container, but no electrodes are provided in the translucent hermetic container, and the enclosed gas is excited by the energy supply means disposed outside the translucent hermetic container. Thus, a discharge is generated in the hermetic space, and visible light is obtained by exciting the fluorescent film formed on the inner surface of the translucent hermetic container with the ultraviolet light emitted thereby. This type of electrodeless fluorescent lamp has no electrode in the translucent airtight container, and thus does not have the above-mentioned pointless life.
Since the life is determined by the life of the luminous flux, a longer life can be expected in principle than an electroded fluorescent lamp. Therefore,
In this type of electrodeless fluorescent lamp, it is more important to improve the luminous flux maintenance rate than in the electroded fluorescent lamp.

As described above, in the fields of fluorescent lamps (including both fluorescent lamps with electrodes and fluorescent lamps without electrodes) and lighting devices for discharge lamps using fluorescent lamps, a future problem to be solved is translucency. There are two methods, namely, a reduction in the amount of mercury consumed in the hermetic container and an improvement in the luminous flux maintenance factor. As can be seen from the above description, it is considered that these two problems are extremely closely related to each other.

Various solutions have been proposed for solving such problems. For example, JP-A-55-12
4940, JP-A-59-20961, JP-A-62-2
Nos. 12055, JP-A-5-151938 and JP-A-9-504645,
Regarding the powder used in the protective layer and the phosphor coating between the permeable airtight container and the phosphor, the particle size and the application weight of the coating material are limited to improve the luminous flux deterioration characteristics of the fluorescent lamp.

[0012]

In the conventional fluorescent lamps disclosed in the above publications, a protective layer made of fine particles or a metal alkoxide solution is provided between a transparent airtight container and a phosphor, and the particles of these materials are provided. The diameter and the coating weight were limited, and a tentative effect could be expected for preventing the luminous flux from deteriorating. However, it has not been possible to obtain a satisfactory effect with respect to severe demands such as a recent increase in the load of a fluorescent lamp and a further improvement in a luminous flux maintenance factor.

The present invention has been made in view of the above problems, and has as its object to provide a fluorescent lamp having an unprecedented excellent luminous flux maintenance ratio and a discharge lamp lighting device using the same. It is.

[0014]

According to a first aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed. A phosphor coating is formed on the inner surface, and a protective layer made of an inorganic powder is formed between the inner surface of the light-transmitting hermetic container and the phosphor coating.
a substance in which the volume fraction of the inorganic powder occupies less than 42.5% of the apparent volume of the compact obtained by compression molding at kgf / cm ² , wherein the inorganic powder has a volume fraction of more than 42.5% Is characterized in that the life of the luminous flux for maintaining the predetermined luminous flux is longer than in the case of using a protective layer made of inorganic powder provided between the inner surface of the translucent airtight container and the phosphor coating. Exhibits a barrier function that minimizes the various types of damage that cause the problem, improves the effect of preventing luminous flux deterioration compared to the conventional technology, and uses a volume fraction of more than 42.5% than when using inorganic powder. It is possible to extend the life of the light beam for maintaining the predetermined light beam.

According to a second aspect of the present invention, in the first aspect of the present invention, the inorganic powder has a volume fraction of the apparent volume of a compact obtained by compression molding at a pressure of 3000 kgf / cm ^2. It is a substance of 36% or more and 41% or less, and has the same effect as the first aspect of the present invention.

According to a third aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, and a phosphor film is coated on an inner surface of the light-transmitting airtight container. and forming, wherein the light-transmissive airtight envelope inner surface protective layer comprising an inorganic powder during the phosphor coating is formed, the inorganic powder is compressed at a pressure 2,000 kgf / cm ² or more and 4000 kgf / cm ² or less The volume fraction of the inorganic powder occupying the apparent volume of the molded product obtained by molding is produced from aluminum hydroxide, the primary particle size is 0.1 μm or less, and the specific surface area by the BET method is approximately 148 m ² / g. Γ
-Characterized in that it is a substance having a value of less than the value of the volume fraction of alumina, and the protective layer made of inorganic powder provided between the inner surface of the translucent airtight container and the phosphor coating causes light flux deterioration. By exhibiting a barrier function of minimizing various types of damage, it is possible to improve the effect of preventing luminous flux deterioration as compared with the related art.

According to a fourth aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, and a phosphor film is coated on an inner surface of the light-transmitting airtight container. When formed, a protective layer made of an inorganic powder is formed between the inner surface of the translucent airtight container and the phosphor coating, and the inorganic powder is charged when it comes into contact with iron powder having a particle size of about 100 μm. A substance whose absolute value of the charge amount exceeds 0.81 μC / g, and whose absolute value of the charge amount is 0.81 μC / g.
/ G or less, wherein the life of the luminous flux for maintaining the predetermined luminous flux is longer than when using an inorganic powder of not more than / g, comprising an inorganic powder provided between the inner surface of the translucent airtight container and the phosphor coating. The protective layer exerts a barrier function of minimizing various types of damages that cause light flux deterioration, improves the effect of preventing light flux deterioration as compared with the related art, and has an absolute value of 0.
It is possible to extend the luminous flux life for maintaining a predetermined luminous flux as compared with the case where an inorganic powder of 81 μC / g or less is used.

According to a fifth aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, and a phosphor film is coated on an inner surface of the light-transmitting airtight container. When formed, a protective layer made of an inorganic powder is formed between the inner surface of the translucent airtight container and the phosphor coating, and the inorganic powder is charged when it comes into contact with iron powder having a particle size of about 100 μm. A substance whose absolute value of the charge amount exceeds the absolute value of the charge amount of γ-alumina produced from aluminum hydroxide and having a primary particle size of 0.1 μm or less and a specific surface area of approximately 148 m ² / g by the BET method. Wherein a protective layer made of inorganic powder provided between the inner surface of the light-transmitting hermetic container and the phosphor coating has a barrier function of minimizing various damages that cause luminous flux deterioration. Demonstrate
It is possible to improve the effect of preventing the luminous flux from deteriorating as compared with the related art.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, a surface protective layer made of an inorganic powder is formed on the surface of the phosphor film on the airtight space side, Means that the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 3000 kgf / cm ² is 46.1.
%, And the barrier function of the surface protective layer makes it possible to further improve the effect of preventing the luminous flux from deteriorating.

According to a seventh aspect of the present invention, in any one of the first to fifth aspects of the present invention, a surface protective layer made of an inorganic powder is formed on the surface of the phosphor coating on the airtight space side, Means that the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 200 kgf / cm ² or more and 5000 kgf / cm ² or less is produced from aluminum chloride and the primary particle diameter is approximately 15 nm. Wherein the specific surface area by the BET method is approximately 100 m ² / g, which is a substance exceeding the value of the volume fraction of γ-alumina. Thus, the effect of preventing the luminous flux from deteriorating can be further improved.

According to an eighth aspect of the present invention, in any one of the first to fifth aspects of the present invention, a surface protective layer made of an inorganic powder is formed on a surface of the phosphor film on the airtight space side, Is a substance having an absolute value of a charge amount of less than 0.58 μC / g when charged with an iron powder having a particle diameter of about 100 μm, and a barrier function of the surface protective layer.
It is possible to further improve the effect of preventing the luminous flux from deteriorating in the inventions of (5) to (5).

According to a ninth aspect of the present invention, in any one of the first to fifth aspects of the present invention, a surface protective layer made of an inorganic powder is formed on the surface of the phosphor film on the airtight space side, Is the absolute value of the amount of charge that is charged when contacted with iron powder having a particle size of about 100 μm, which is generated from aluminum chloride and is 1
2. A material having a secondary particle diameter of about 15 nm and a specific surface area measured by a BET method of about 100 m ² / g, which is less than the absolute value of the charge amount of γ-alumina, and a barrier function of the surface protective layer. It is possible to further improve the effect of preventing the luminous flux from deteriorating in the inventions of (5) to (5).

According to a tenth aspect of the present invention, in any one of the first to ninth aspects of the present invention, at least an inorganic powder other than the phosphor particles is mixed with the phosphor particles in the phosphor coating or is added to the phosphor particles. The inorganic powder is a substance in which the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 3000 kgf / cm ² exceeds 46.1%. It is characterized in that the barrier function of the inorganic powder makes it possible to further improve the effect of preventing the luminous flux from deteriorating with respect to the first to ninth aspects.

[0024] According to an eleventh aspect of the present invention, in any one of the first to ninth aspects of the present invention, at least an inorganic powder other than the phosphor particles is mixed with the phosphor particles in the phosphor coating or is added to the phosphor particles. The inorganic powder has a pressure of 200 kgf / cm ² or more and 5000 kgf
The volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at not more than / m ² is produced from aluminum chloride, the primary particle diameter is about 15 nm, and the specific surface area by the BET method is about 100 m. ² / g is a substance exceeding the value of the volume fraction of γ-alumina, and the barrier function of the inorganic powder further improves the effect of preventing luminous flux deterioration from the invention of claims 1 to 9 It is possible to do.

According to a twelfth aspect of the present invention, in any one of the first to fifth aspects, the particle diameter of the inorganic powder is 1 to 100 nm.
It has the same effect as the first to fifth aspects of the invention.

The invention of claim 13 is the invention according to any one of claims 1 to 5, wherein the specific surface area of the inorganic powder by a BET method is 80 m ² / g or more.
The same effect as that of the fifth invention is exerted.

The invention of claim 14 is the invention of claims 1 to 5
The fluorescent lamp according to any one of the above, an energy supply means disposed inside or outside the translucent airtight container to supply energy to the discharge medium, and the energy supply means, A lighting device for lighting a fluorescent lamp is provided, and a discharge lamp lighting device capable of improving the effect of preventing luminous flux deterioration as compared with the related art can be realized.

By the way, the present inventors, when extracting the solution to the above problem, coexist in a protective layer provided between the translucent airtight container and the phosphor coating, on the phosphor coating surface, and in the phosphor coating. Various experimental studies were conducted on inorganic powders, focusing on the filling rate and charge amount of the forming material. As a result, a clear effect difference was found in the luminous flux maintaining characteristics of the fluorescent lamp due to the difference in the filling rate and charge amount of the material.

[0029] Unfortunately, the mechanism of the effect of such an effect has not been fully elucidated so far, but the protective layer made of the above-mentioned inorganic powder is generally the main cause of deterioration of the luminous flux of a fluorescent lamp. Deterioration of the phosphor due to diffusion into the phosphor coating, such as mercury from the discharge plasma and alkali from the glass bulb, which is the cause, and a deterrent effect on the production of reaction products (black and brown) It is thought that there is.

In other words, it is presumed that the provision of the material having the proper properties in the right place in the fluorescent lamp has given a favorable effect.

Therefore, based on this result, the present inventors defined the particle size of the above-mentioned materials and the application weight, which is a condition in the process of manufacturing the light-transmitting hermetic container, as in the prior art, thereby maintaining the luminous flux of the fluorescent lamp. Unlike those that have been improved in properties, focusing on the other physical properties of the material, that is, the filling rate and the amount of charge, forming each protective layer with a material with the right physical properties for the right material The present invention was carried out by focusing on the point that the retention characteristics are improved.

[0032]

(Embodiment 1) In this embodiment,
The fluorescent lamp La is an electrodeless fluorescent lamp as shown in FIG. 2, and a discharge medium made of mercury vapor and a rare gas is sealed in an airtight space 2 inside a spherical translucent airtight container 1 made of glass. ing. As shown in FIG. 1, a phosphor coating 3 made of phosphor particles 7 is formed on the inner surface of the translucent airtight container 1. An induction coil 5 is wound outside the translucent airtight container 1 close to the translucent airtight container 1. Here, the induction coil 5 constitutes energy supply means for supplying energy to the discharge medium. This fluorescent lamp La
Lighting device 2 in which induction coil 5 lights fluorescent lamp La
0 is connected to the power supply 6. Here, the fluorescent lamp La, the induction coil 5 and the lighting device 20 constitute a discharge lamp lighting device.

In this discharge lamp lighting device, a high-frequency current is caused to flow through the induction coil 5 by the lighting device 20, thereby generating a high-frequency electromagnetic field around the induction coil 5 and exciting the discharge medium in the translucent airtight container 1. It emits light. In the present embodiment, the induction coil 5 is used as the energy supply unit. However, instead of the induction coil 5, a conductor foil or a conductor plate may be used.

In this embodiment, as shown in FIG. 1, a protective layer made of an inorganic powder (hereinafter referred to as a “glass protective layer”) is provided between the inner surface of the light-transmitting airtight container 1 and the phosphor coating 3. 8) is formed, and the inorganic powder has a pressure of 3000 kg.
It is characterized in that the inorganic powder has a volume fraction of less than 42.5% of the apparent volume of the compact obtained by compression molding at f / cm ² .

Here, the “volume fraction φ of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 3000 kgf / cm ² ” will be described. Volume fraction of powder in the apparent volume of the compact obtained by compression molding φ
[%] Represents the true specific gravity of the inorganic powder as d, and the weight of the powder as W [g].
And the apparent volume of the compact obtained by compressing
When [cc] is used, it is calculated by the following equation.

Φ = 100 (W / d) / V The above volume fraction φ [%] is generally called a filling rate. For example, the smaller the volume fraction, the larger the proportion of voids and the lower the filling rate. In this case, 3
It means the filling rate when a pressure of 000 kgf / cm ² is applied.

The inorganic powder is, for example, silica (Si
O ₂ ), alumina (Al ₂ O ₃ ), yttria (Y ₂ O ₃ )
And has a relatively high transmittance in the ultraviolet and visible regions. Although these metal oxides are suitable from the viewpoint of practicality in consideration of cost performance, other metal compounds such as fluoride and nitride may be used in some cases.

Thus, the volume fraction (filling rate) as described above
By forming the glass protective layer 8 between the inner surface of the translucent airtight container 1 and the phosphor coating 3 using a substance (inorganic powder) that satisfies the above condition, the inorganic powder forming the glass protective layer 8 is By exhibiting a barrier function for suppressing various types of damage that may cause light flux deterioration, it is possible to improve the effect of preventing light flux deterioration as compared with the related art. It is desirable to use a substance having a volume fraction of 36% or more and 41% or less as the inorganic powder.

(Embodiment 2) The basic structure of this embodiment is almost the same as that of Embodiment 1, and the inorganic powder forming the glass protective layer 8 is pressed at a pressure of 2000 kgf / cm ² or more and 4000 kF.
When the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at gf / cm ² or less is produced from aluminum hydroxide and the primary particle diameter is 0.1 μm or less, and BE
It is characterized in that it is a substance having a specific surface area according to the T method of about 148 m ² / g or less and a value of the volume fraction of γ-alumina or less. As a material (substance) satisfying such conditions and widely known in the field of fluorescent lamps, alumina (trade name: AKP-G015, manufactured by Sumitomo Chemical Co., Ltd.)
This embodiment is characterized in that the glass protective layer 8 is formed of an inorganic powder having a filling factor lower than the filling factor of this material.

Here, the "specific surface area by BET method"
"" Means the surface area per unit weight of the powder material determined by the BET method. In addition, the BET method means that the adsorbed gas is sufficiently expelled from the weighed powder by heating and depressurizing, and a certain amount of gas is passed through the powder while maintaining the temperature at a low temperature. Is calculated to obtain the specific surface area.

Thus, if the glass protective layer 8 is formed of the above-mentioned inorganic powder, the inorganic powder forming the protective layer 8 exhibits a barrier function for suppressing various types of damage that may cause light flux deterioration. This makes it possible to improve the effect of preventing luminous flux deterioration as compared with the related art.

(Embodiment 3) The basic configuration of this embodiment is almost the same as that of Embodiment 1, and the inorganic powder forming the glass protective layer 8 is contacted with iron powder having a particle diameter of about 100 μm. It is characterized in that the substance has an absolute value of the amount of charge exceeding 0.81 μC / g.

Here, the “charge amount of inorganic powder” generally means that after mixing and contacting the target inorganic powder and a contact partner powder called a carrier, the inorganic powder and the contact partner powder are mixed. It is defined by the amount of charge remaining on the inorganic powder when separated, and there are various measurement methods.Blow-off method using a Faraday cage and the like are best known. Take. The numerical value of the charge amount described in the specification of the present application is the above value (0.8
1 μC / g) and a particle size of 100 μm as a carrier by an E-SPART analyzer (trade name: E-SPART-2, manufactured by Hosokawa Micron) using the laser Doppler method.
It is a value when measured at an applied voltage of 200 V using reduced iron powder before and after.

Thus, the glass protective layer 8 is formed between the inner surface of the translucent airtight container 1 and the phosphor coating 3 using a substance (inorganic powder) that satisfies the above condition of the charge amount. Accordingly, the inorganic powder forming the glass protective layer 8 exhibits a barrier function for suppressing various types of damage that may cause light flux deterioration, and it is possible to improve the effect of preventing light flux deterioration as compared with the related art.

(Embodiment 4) The basic configuration of this embodiment is almost the same as that of Embodiment 1, and the inorganic powder forming the glass protective layer 8 is charged when it comes into contact with iron powder having a particle diameter of about 100 μm. The absolute value of the charge amount exceeds the absolute value of the charge amount of γ-alumina produced from aluminum hydroxide and having a primary particle size of 0.1 μm or less and a specific surface area of approximately 148 m ² / g by the BET method. It is characterized by being a substance. As a material (substance) that satisfies such conditions and has been widely known in the field of fluorescent lamps in the past, the above-mentioned alumina having the trade name of AKP-G015 is cited. From the absolute value of the charge amount of this material, This embodiment is characterized in that the glass protective layer 8 is formed of an inorganic powder having a large charge amount.

When the glass protective layer 8 is formed of the above-mentioned inorganic powder, the inorganic powder forming the glass protective layer 8 exhibits a barrier function for suppressing various types of damage that may cause light flux deterioration. However, it is possible to improve the effect of preventing luminous flux deterioration as compared with the related art.

In the first to fourth embodiments,
The particle size of the inorganic powder forming the glass protective layer 8 is 1
An inorganic powder having a thickness of from 100 to 100 nm or an inorganic powder having a specific surface area (value according to the BET method) of 80 m ² / g or more may be used.

(Embodiment 5) In this embodiment, as shown in FIG. 3, in addition to the structure of any one of Embodiments 1 to 4, an inorganic powder is formed on the surface of the phosphor film 7 on the airtight space 2 side. A protective layer (hereinafter, referred to as “surface protective layer”) 9 is formed, and the inorganic powder forming the surface protective layer 9 has a pressure of 3000 kgf / cm ^2.
It is characterized in that it is a substance in which the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding exceeds 46.1%.

Thus, the volume fraction (filling rate) as described above
By forming the surface protective layer 9 on the surface of the phosphor coating 7 on the airtight space 2 side with a substance (inorganic powder) satisfying the condition (1), the inorganic powder forming the surface protective layer 9 causes deterioration of luminous flux. By exhibiting a barrier function of suppressing various types of damage that may cause the light flux, it is possible to improve the effect of preventing light flux deterioration as compared with the related art. In other words, the glass protective layer 8 and the surface protective layer 9 are formed of a material (inorganic powder) having the proper physical properties in the right place by paying attention to the filling rate and the charge amount among the physical properties of the material. As a result, it is possible to improve the luminous flux maintaining characteristics.

(Embodiment 6) The basic configuration of this embodiment is almost the same as that of Embodiment 5, except that the inorganic powder forming the surface protective layer 9 is pressed at a pressure of 200 kgf / cm ² or more and 5000 kgf / c.
The volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at m ² or less is a volume fraction of the inorganic powder produced from aluminum chloride, the primary particle diameter is about 15 nm, and the specific surface area by the BET method is about 100 m ^2. It is characterized by being a substance exceeding the value of the volume fraction of γ-alumina which is / g. As a material (substance) that satisfies such conditions, there may be mentioned alumina (trade name) of aluminum oxide C (manufactured by Degussa Co., Ltd.). The feature of the present embodiment lies in the point that 9 is formed.

When the surface protective layer 9 is formed of the above-mentioned inorganic powder, the inorganic powder forming the surface protective layer 9 exhibits a barrier function for suppressing various types of damage that may cause deterioration of light flux. However, it is possible to improve the effect of preventing luminous flux deterioration as compared with the related art.

(Embodiment 7) The basic configuration of this embodiment is almost the same as that of Embodiment 5, and the inorganic powder forming the surface protective layer 9 is charged when it comes into contact with iron powder having a particle size of about 100 μm. The absolute value of the charge amount is less than 0.58 μC / g.

By forming the surface protective layer 9 with a substance (inorganic powder) satisfying the above-mentioned charge amount condition, the inorganic powder forming the surface protective layer 9 causes the luminous flux to deteriorate. It exhibits a barrier function of suppressing various types of damage, and can improve the effect of preventing luminous flux deterioration as compared with the related art. In other words, the glass protective layer 8 and the surface protective layer 9 are formed of a material (inorganic powder) having the proper physical properties in the right place by paying attention to the filling rate and the charge amount among the physical properties of the material. As a result, it is possible to improve the luminous flux maintaining characteristics.

(Embodiment 8) The basic configuration of this embodiment is almost the same as that of Embodiment 5, and the inorganic powder forming the surface protective layer 9 is charged when it comes into contact with iron powder having a particle diameter of about 100 μm. Is a substance which is produced from aluminum chloride, has a primary particle size of about 15 nm, and has a specific surface area of about 100 m ² / g by the BET method, which is not more than the absolute value of the charge quantity of γ-alumina. It is characterized by: As a material (substance) that satisfies such a condition, alumina (trade name: aluminum oxide C, manufactured by Degussa Co., Ltd.)
This embodiment is characterized in that the surface protective layer 9 is formed of an inorganic powder having a charge amount equal to or less than the absolute value of the charge amount of this material.

When the surface protective layer 9 is formed of the above-mentioned inorganic powder, the inorganic powder forming the surface protective layer 9 exhibits a barrier function for suppressing various types of damage that may cause light flux deterioration. However, it is possible to improve the effect of preventing luminous flux deterioration as compared with the related art.

As a specific method for forming the “glass protective layer 8” or the “surface protective layer 9” described in the first to eighth embodiments, a method conventionally used in this field can be used. Good. That is, a suspension method in which the inorganic powder is dispersed in water or an organic solvent together with an appropriate binder is prepared, and a wet method in which the suspension is applied by spray coating or spraying may be used, or a powder such as an electrostatic coating may be used as it is. A dry method may be used.

(Embodiment 9) In this embodiment, as shown in FIG. 4, in addition to the structure of any one of Embodiments 5 to 8, an inorganic powder 10 other than phosphor particles The inorganic powder 10 is mixed at least with the body particles or coexists in such a manner as to adhere to the phosphor particles.
It is characterized in that the inorganic powder has a volume fraction of more than 46.1% of the apparent volume of the compact obtained by compression molding at 000 kgf / cm ² .

Thus, the volume fraction (filling rate) as described above
(Inorganic powder 10) satisfying the above conditions
The inorganic powder 10 exhibits a barrier function of suppressing various damages that cause deterioration of the luminous flux by coexisting at least in the form of being mixed with or adhering to the phosphor particles forming the phosphor particles. As a result, the effect of preventing luminous flux deterioration can be improved. That is,
Paying attention to the filling rate and the charge amount among the physical properties of the material, the inorganic powder 10 in the glass protective layer 8, the surface protective layer 9, and the phosphor coating 7 is made of a material (inorganic It is possible to improve the luminous flux maintaining characteristics as compared with the related art by forming the particles with a powder.

(Embodiment 10) The basic configuration of this embodiment is almost the same as that of Embodiment 9, except that the inorganic powder 10 existing in the phosphor coating 7 is pressed at a pressure of 200 kgf / cm ² or more and 50 times.
The volume fraction of the inorganic powder occupying the apparent volume of the compact obtained by compression molding at a pressure of 00 kgf / cm ² or less is made of aluminum chloride, and the primary particle diameter is about 15 nm.
It is characterized in that it is a substance having a specific surface area determined by the method exceeding about the volume fraction of γ-alumina, which is approximately 100 m ² / g. As a material (substance) that satisfies such a condition, there can be mentioned the above-mentioned alumina of aluminum oxide C (manufactured by Degussa Co., Ltd.), and the inorganic powder 10 having a higher filling factor than this material. Is present in the phosphor coating 7 in this embodiment.

Thus, if the above-mentioned inorganic powder 10 is present in the phosphor coating 7, the inorganic powder 10 exhibits a barrier function for suppressing various types of damage that may cause light flux deterioration,
It is possible to improve the effect of preventing the luminous flux from deteriorating as compared with the related art.

In each of the above embodiments, an electrodeless fluorescent lamp has been described as the fluorescent lamp La. However, the fluorescent lamp La may be a straight tube electrode fluorescent lamp as shown in FIG. In this fluorescent lamp La, a discharge medium made of mercury vapor and a rare gas is sealed in a hermetically sealed space 2 inside a translucent airtight container 1 made of glass. Electrodes 4 (which may be either a hot cathode type or a cold cathode type) serving as energy supply means are disposed inside both ends of the translucent airtight container 1.
Is connected to the power supply 6 via the. Also in this case, the fluorescent lamp La and the lighting device 21 constitute a discharge lamp lighting device. The shape of the translucent airtight container 1 of the electrodeed fluorescent lamp La shown in FIG. 5 is a straight tube shape, but the translucent airtight container 1 is not limited to a straight tube shape. Alternatively, it may be of course a bent type.

FIG. 6 is a block diagram of a discharge lamp lighting device including the electrodeless fluorescent lamp or electrodeed fluorescent lamp La, the power supply 6 and the lighting devices 20 and 21. Starting and lighting are possible by 20, 21.

[0063]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 5 corresponding to the inventions of claims 1 to 5
Table 1 below shows the results of lighting experiments performed on the fluorescent lamp La described in Section 4 by changing the inorganic powder constituting the glass protective layer 8 in various ways. As is clear from Table 1, by forming the glass protective layer 8 from a substance (inorganic powder) satisfying a predetermined filling rate or charge amount condition, the luminous flux maintenance rate is improved as compared with the conventional example. Was done. here,
Each of the embodiments, the conventional examples, and the examination examples described below are all electrodeless fluorescent lamps, and the phosphor particles 7 are Y ₂ O ₃ : Eu (3) which is a rare earth phosphor which is a typical phosphor.
Europium inactive yttrium oxide) is used.
In the lighting experiment, the tube wall load during lighting (lamp input,
The light emission area, that is, the value obtained by dividing the area of application of the phosphor coating) was set to about 150 mW / cm ² .

[0064]

[Table 1]Further, referring to Table 1, the first stage shows glass protection.
The material (inorganic powder) for forming the layer 8 is described.
Has a pressure of 2000, 3000, 4000 kgf / cm ^TwoCompressed with
Inorganic powder occupies the apparent volume of the molded body obtained by molding
, That is, the filling rate [%], and
Describe the absolute value of charge amount [μC / g], and
As a measure of the luminous flux maintenance factor, the luminous flux life of Conventional Example 1
Relative values [%]. Where the luminous flux life
Means that the luminous flux value when the lighting time is 100 hours is 100
%, The time it takes for the luminous flux to drop to 70%
Is measured as the luminous flux life. Thus, the numbers in Table 1
The larger the value [%], the longer the luminous flux life
Means that

Specifically, Conventional Example 1 is one in which Al ₂ O ₃ (AKP-G015 manufactured by Sumitomo Chemical Co., Ltd., mentioned above) is applied as an inorganic powder for forming the glass protective layer 8. As described in JP-A-151938, it is a conventionally known material for a fluorescent lamp. Also,
Conventional Example 2 uses A as an inorganic powder for forming the glass protective layer 8.
l ₂ O ₃ (aluminum oxide C manufactured by Degussa, supra)
Is applied, which is disclosed in JP-A-9-504645.
Similarly, as described in Japanese Patent Application Laid-Open Publication No. H10-209, it is a conventionally known material.

In Examples 1 to 4 listed in Table 1, the filling rate [%] at a pressure of 3000 kgf / cm ² was 42.5%.
The glass protective layer 8 is formed of a substance (inorganic powder) smaller than the above. Specifically, Example 1 is SiO ₂ (trade name Aerosil 380PE manufactured by Degussa), and Example 2 is SiO ₂ ( Aerosil 130 (trade name, manufactured by Degussa Co.), Example 3 is SiO ₂ (trade name: Leolosil QS-10, manufactured by Tokuyama Soda Co., Ltd.), and Example 4 is S containing 1% Al ₂ O _3.
iO ₂ (Aerosil MOX80 (trade name, manufactured by Degussa)) is used as an inorganic powder for forming the glass protective layer 8.
In addition, although it is not an Example and a conventional example, a filling rate is 42.5.
% Y ₂ O ₃ (Nano trade name, manufactured by CI Kasei Co., Ltd.)
TekY ₂ O ₃ ) is described as Study Example 1.

Here, when the horizontal axis represents the filling factor [%] at a pressure of 3000 kgf / cm ² and the vertical axis represents the luminous flux value when the lighting time is 100 hours, the luminous flux value is 70%. %
The time required to decrease to 10
FIG. 7 shows a graph in which a relative value when 0% is taken.
The horizontal axis represents the load [kgf / cm ² ], and the vertical axis represents the filling rate [%].
8 is shown in FIG. As is clear from FIG. 8, in Examples 1 to 4, the load applied to the powder was 20%.
Any value between 00 kgf / cm ² and 4000 kgf / cm ² shows a smaller value than Al ₂ O ₃ of Conventional Examples 1 and ₂ .

As is apparent from FIG. 7, it is found that there is a correlation between the filling rate of various fine particle materials and the luminous flux maintenance rate of the fluorescent lamp using these as the glass protective layer 8. It has been found that the luminous flux life is improved in Examples 1 to 4 using materials having a smaller filling factor than Conventional Examples 1 and 2. In addition, in Study Example 1 using a material having a higher filling factor than in Reference Examples 1 and 2, no improvement in the luminous flux life was observed.

On the other hand, the horizontal axis represents the absolute value of the charge amount [μC / g].
When the luminous flux value is 100% when the lighting time is 100 hours on the vertical axis, the time required for the luminous flux value to drop to 70% is 100% when the data in the case of Conventional Example 1 is 100%. FIG. 9 is a graph showing relative values. As can be seen from the figure, SiO ₂ (Aerosil 130, trade name, manufactured by Degussa) whose absolute value of the charge amount exceeds 0.81 [μC / g]
In Example 2 using, the effect of improving the luminous flux life was observed. However, the charge amount of the absolute value of 0.81 [[mu] C / g] is smaller than Y ₂ O ₃ (CI Kasei Co., trade name NanoTek
In Study Example 1 using Y ₂ O ₃ ), no effect of improving the luminous flux life was observed.

Next, for the sample in which the surface protective layer 9 was formed with various inorganic powders, the pressure was 3000 kgf / cm ² on the horizontal axis.
When the filling rate [%] is 100% and the luminous flux value is 100% when the lighting time is 100 hours on the vertical axis, the luminous flux value is 70%.
% In the case of Conventional Example 2 as 1
FIG. 10 is a graph showing the relative values when the ratio is set to 00%. In Example 5, Conventional Examples 1 and 2, and Study Example 2, the horizontal axis represents the load [kgf / cm ² ], and the vertical axis represents the filling rate [%].
Is shown in FIG. Here, Example 5
The material forming the surface protective layer 9 (inorganic powder) in are those with Y ₂ O ₃ (CI Kasei Co., Ltd. under the trade name NanoTekY ₂ O _3), 5000k the fill factor from the pressure 200 kgf / cm ²
The value of gf / cm ² is always larger than that of Al ₂ O ₃ of Conventional Example 2 (aluminum oxide C manufactured by Degussa).

As is apparent from FIG.
As the inorganic powder for forming the protective layer 9, the filling rate is the same as the conventional example 2
(46.1 [%]), for example, Y in Example 5
_TwoO_Three(NanoTekY, a product name of CI Kasei Co., Ltd._TwoO_Three)
Has the effect of improving the luminous flux life,
Further improvement of luminous flux life by using together with glass protective layer 8
The effect can be expected. Note that the filling rate is higher than that of Conventional Examples 1 and 2.
Low study example 2 (SiO 2 _Two: Degussa's trade name Aeroji
130), the luminous flux maintenance ratio is higher than that of the conventional examples 1 and 2.
Inferior.

On the other hand, the horizontal axis represents the absolute value of the charge amount [μC / g].
When the luminous flux value is 100% when the lighting time is 100 hours on the vertical axis, the time until the luminous flux value decreases to 70% is 100% when the data in the second conventional example is 100%. FIG. 12 is a graph showing relative values. As can be seen from the figure, the absolute value of the charge amount on the surface protective layer 9 is 0.58.
[[Mu] C / g] less material Y ₂ O ₃ of Example 5 (CI Kasei Co., Ltd. under the trade name NanoTekY ₂ O ₃₎ used as the, the combined use of low fill factor material glass protective layer 8, the light beam Life expectancy can be improved.

Next, with respect to a sample in which various inorganic powders were mixed in the phosphor coating 7 with at least the phosphor particles or coexisted in such a manner as to adhere to the phosphor particles, the horizontal axis was filled at a pressure of 3000 kgf / cm ^2. When the luminous flux value when the lighting time is 100 hours and the luminous flux value is 100% on the vertical axis, the time until the luminous flux value decreases to 70% is set to 100% of the data in the conventional example 2. FIG. 13 shows a graph in which relative values are obtained in the case where. The embodiment 6 in FIG.
Y ₂ whose filling rate exceeds the value of conventional example 2 (46.1 [%])
This is a sample in which O ₃ (NanoTek Y ₂ O ₃ made by C-I Kasei Co., Ltd.) coexists in the phosphor coating 7 as an inorganic powder 10. Here, the filling rate of Y ₂ O ₃ used in Example 6 (CI Kasei Co., Ltd. under the trade name NanoTekY ₂ O ₃₎ is a pressure 200kgf
/ cm ² to 5000 kgf / cm ² , the Al ₂ O of Conventional Example 2
₃ (shown in FIG. 11).

[0074] In Thus, as is clear from FIG. 13, by using the above Y ₂ O ₃ in the inorganic powder 10 coexist in the phosphor coating 7 (CI Kasei Co., Ltd. under the trade name NanoTekY ₂ O ₃₎ The effect of improving the luminous flux life is seen. It is to be noted that such an inorganic powder 10 is allowed to coexist in the phosphor coating 7 and that the glass protective layer 8 made of a material having a low filling rate and the surface protective layer 9 made of a material having a high filling rate are used in combination. In this case, the effect of further improving the luminous flux life can be expected.

From the experimental results of the above-described embodiment, it is found that the particle size of the material (inorganic powder) for forming the glass protective layer 8 and the surface protective layer 9 and the conditions in the manufacturing process of the light-transmitting hermetic container 1 are different from those of the prior art. Compared to those that have improved the luminous flux maintenance characteristics of fluorescent lamps by defining a certain coating weight, the present invention focuses on other physical properties of the material, that is, the filling rate and the amount of charge, By providing the protective layers 8 and 9 made of a material having the right material in the right place in the fluorescent lamp, or by allowing the above-mentioned material (inorganic powder 10) to coexist in the phosphor coating 7, the translucent airtight container 1 is provided. Between the phosphor film 7 and the surface of the phosphor film 7 and the inorganic powder disposed in the phosphor film 7, a barrier function for minimizing various damages that cause deterioration of light flux is exhibited. To improve the effect of preventing luminous flux deterioration It has become possible.

[0076]

According to the first aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, and a phosphor film is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container is formed. A protective layer made of an inorganic powder is formed between the inner surface of the light-tight container and the phosphor coating, and the inorganic powder occupies an inorganic volume occupying an apparent volume of a compact obtained by compression molding at a pressure of 3000 kgf / cm ^2. The powder has a volume fraction of less than 42.5%, and the luminous flux life for maintaining a predetermined luminous flux is longer than when using an inorganic powder having a volume fraction exceeding 42.5%. A protective layer made of an inorganic powder provided between the inner surface of the light-transmitting hermetic container and the phosphor coating exerts a barrier function of minimizing various damages that cause luminous flux deterioration, compared with the conventional case. Improves the effect of preventing luminous flux deterioration and achieves a volume fraction of 4 Than when using the inorganic powder in excess of .5% makes it possible to increase the light beam lifetime to maintain a predetermined light beam.

According to a second aspect of the present invention, the inorganic powder has a volume fraction of 36% to 41% of the apparent volume of a compact obtained by compression molding at a pressure of 3000 kgf / cm ^2.
Since it is the following substance, it has the same effect as the first aspect of the invention.

According to a third aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, wherein a phosphor film is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container is formed. wherein the airtight container inner surface protective layer comprising an inorganic powder during the phosphor coating is formed, the inorganic powder, the pressure 2,000 kgf / cm ² or more and 4000 kgf / cm ² is obtained by compression molding the following moldings The volume fraction of the inorganic powder in the apparent volume is 1
The primary particle size is 0.1 μm or less and the specific surface area by the BET method is approximately 148 m ² / g. Since the substance is less than the value of the volume fraction of γ-alumina, the inner surface of the translucent airtight container and the phosphor The protective layer made of inorganic powder provided between the coatings exhibits a barrier function that minimizes various types of damage that cause light flux deterioration, and improves the effect of preventing light flux deterioration as compared with the related art. It becomes possible.

According to a fourth aspect of the present invention, there is provided a light-transmitting hermetic container in which a discharge medium containing at least mercury is sealed, and a phosphor film is formed on an inner surface of the light-transmitting hermetic container. A protective layer made of an inorganic powder is formed between the inner surface of the airtight container and the phosphor coating, and the inorganic powder has an absolute value of a charge amount of 0. The translucent hermetic container is a substance that exceeds 81 μC / g and has a longer luminous flux life for maintaining a predetermined luminous flux than when using an inorganic powder having an absolute value of the charge amount of 0.81 μC / g or less. A protective layer made of an inorganic powder provided between the inner surface and the phosphor coating exerts a barrier function of minimizing various types of damage that may cause luminous flux deterioration. And the absolute value of the charge amount is 0.81 It is possible to increase the light beam lifetime to maintain a predetermined light flux than when using the C / g or less of an inorganic powder.

According to a fifth aspect of the present invention, there is provided a light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, wherein a phosphor film is formed on an inner surface of the light-transmitting airtight container and the light-transmitting airtight container is formed. A protective layer made of an inorganic powder is formed between the inner surface of the hermetic container and the phosphor coating, and the inorganic powder has an absolute value of a charge amount that is charged when it comes into contact with iron powder having a particle size of about 100 μm. It is a substance produced from aluminum oxide and having a primary particle size of 0.1 μm or less and a specific surface area measured by the BET method of about 148 m ² / g, which exceeds the absolute value of the charge amount of γ-alumina. A protective layer made of an inorganic powder provided between the inner surface of the airtight container and the phosphor coating exhibits a barrier function of minimizing various types of damage that may cause luminous flux deterioration. It is possible to improve the prevention effect That.

According to a sixth aspect of the present invention, a surface protective layer made of inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is compression-molded at a pressure of 3000 kgf / cm ^2. Since the volume fraction of the inorganic powder occupying the apparent volume of the obtained compact exceeds 46.1%, the barrier function of the surface protective layer further prevents the luminous flux from deteriorating. The effect can be improved.

According to a seventh aspect of the present invention, a surface protective layer made of an inorganic powder is formed on a surface of the phosphor film on the airtight space side, and the inorganic powder is applied at a pressure of 200 kgf / cm ² or more and 50 kg / cm ² or more.
The volume fraction of the inorganic powder occupying the apparent volume of the compact obtained by compression molding at a pressure of 00 kgf / cm ² or less is made of aluminum chloride, and the primary particle diameter is about 15 nm.
Γ-alumina having a specific surface area of about 100 m ² / g by volume method, which exceeds the volume fraction of γ-alumina. The effect can be improved.

According to the invention of claim 8, a surface protective layer made of inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is made of iron powder having a particle size of about 100 μm. Since the absolute value of the charge amount to be charged at the time of contact is less than 0.58 μC / g, the barrier function of the surface protective layer can further improve the effect of preventing the luminous flux from deteriorating. It becomes possible.

According to a ninth aspect of the present invention, a surface protective layer made of inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is made of iron powder having a particle size of about 100 μm. The absolute value of the charge amount charged upon contact is less than the absolute value of the charge amount of γ-alumina produced from aluminum chloride, having a primary particle size of about 15 nm, and a specific surface area of about 100 m ² / g by the BET method. Since it is a substance, the barrier effect of the surface protective layer makes it possible to further improve the effect of preventing the light flux from deteriorating as compared with the first to fifth aspects.

According to a tenth aspect of the present invention, an inorganic powder other than the phosphor particles is present in the phosphor coating at least in a form of being mixed with the phosphor particles or adhering to the phosphor particles. The body is a substance in which the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 3000 kgf / cm ² exceeds 46.1%.
The barrier function of the inorganic powder makes it possible to further improve the effect of preventing the luminous flux from deteriorating with respect to the first to ninth aspects.

An eleventh aspect of the present invention is that the inorganic powder other than the phosphor particles is mixed at least with the phosphor particles or coexisted in the phosphor coating so as to be attached to the phosphor particles. The volume of the inorganic powder in the apparent volume of the compact obtained by compression molding at a pressure of 200 kgf / cm ² or more and 5000 kgf / cm ² or less is formed from aluminum chloride, and the primary particle size is approximately It is a substance exceeding 15% in volume fraction of γ-alumina having a specific surface area of about 100 m ² / g by the BET method. Further, it is possible to improve the effect of preventing light flux deterioration.

According to the twelfth aspect of the present invention, since the particle diameter of the inorganic powder is 1 to 100 nm, the same effects as those of the first to fifth aspects can be obtained.

A thirteenth aspect of the present invention relates to a method for producing the inorganic powder by using BE.
Since the specific surface area by the T method is 80 m ² / g or more, the same effects as those of the first to fifth aspects of the invention can be obtained.

The invention of claim 14 is the invention of claims 1 to 5
The fluorescent lamp according to any one of the above, an energy supply means disposed inside or outside the translucent airtight container to supply energy to the discharge medium, and the energy supply means, Since there is provided a lighting device for lighting the fluorescent lamp, it is possible to realize a discharge lamp lighting device capable of improving the effect of preventing luminous flux deterioration as compared with the related art.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of Embodiments 1 to 4 of the present invention.

FIG. 2 is a schematic configuration diagram of a discharge lamp lighting device using the same.

FIG. 3 is an explanatory view of a main part of Embodiments 5 to 8 of the present invention.

FIG. 4 is an explanatory view of a main part of Embodiments 9 and 10 of the present invention.

FIG. 5 is a schematic configuration diagram of another discharge lamp lighting device of the present invention.

FIG. 6 is a block diagram of a discharge lamp lighting device according to the present invention.

FIG. 7 is an explanatory diagram for explaining Examples 1 to 4 of the present invention.

FIG. 8 is an explanatory diagram for explaining Examples 1 to 4 of the present invention.

FIG. 9 is an explanatory diagram for explaining a second embodiment of the present invention.

FIG. 10 is an explanatory diagram for explaining a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram for explaining the above.

FIG. 12 is an explanatory diagram for explaining the above.

FIG. 13 is an explanatory diagram for explaining the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Translucent airtight container 2 Airtight space 3 Phosphor coating film 7 Phosphor particle 8 Glass protective layer

Claims (14)

[Claims] 1. A light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, a phosphor coating is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container has an inner surface and A protective layer made of an inorganic powder is formed between the phosphor films, and the inorganic powder has a pressure of 3000 kgf / cm ^2.
When the inorganic powder has a volume fraction of less than 42.5% of the apparent volume of the compact obtained by compression molding, and the inorganic powder has a volume fraction of more than 42.5%. A fluorescent lamp characterized in that the life of a luminous flux for maintaining a predetermined luminous flux is longer than that of a fluorescent lamp. 2. The inorganic powder has a pressure of 3000 kgf / cm ^2.
2. The fluorescent lamp according to claim 1, wherein the volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding is a substance of 36% or more and 41% or less. 3. A light-transmitting airtight container in which a discharge medium containing at least mercury is enclosed, a phosphor film is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container has an inner surface and A protective layer made of an inorganic powder is formed between the phosphor coatings, and the inorganic powder has a pressure of 2000 kgf / cm ^2.
The volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression-molding at a pressure of not more than 4000 kgf / cm ^{2 is} 4000 kgf / cm ^2.
μm or less and the specific surface area by the BET method is approximately 148 m ² / g
A fluorescent lamp characterized by being a substance having a volume fraction of less than the value of γ-alumina. 4. A light-transmitting airtight container in which a discharge medium containing at least mercury is sealed, a phosphor film is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container has an inner surface and a light-transmitting airtight container. A protective layer made of an inorganic powder is formed between the phosphor coatings. The inorganic powder has an absolute value of a charge amount of 0.81 μm when the inorganic powder is in contact with iron powder having a particle size of about 100 μm.
C / g, and the absolute value of the charge amount is 0.
A fluorescent lamp characterized by having a longer luminous flux life for maintaining a predetermined luminous flux than when using an inorganic powder of 81 μC / g or less. 5. A light-transmitting airtight container in which a discharge medium containing at least mercury is enclosed, a phosphor film is formed on an inner surface of the light-transmitting airtight container, and the light-transmitting airtight container has an inner surface and A protective layer made of an inorganic powder is formed between the phosphor coatings, and the inorganic powder has an absolute value of a charge amount that is charged when it comes into contact with iron powder having a particle size of about 100 μm, which is generated from aluminum hydroxide. A fluorescent lamp having a primary particle diameter of 0.1 μm or less and a specific surface area measured by a BET method of about 148 m ² / g, which exceeds the absolute value of the charge amount of γ-alumina. 6. A surface protective layer made of an inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is formed of a compact obtained by compression molding at a pressure of 3000 kgf / cm ² . The volume fraction of the inorganic powder in the apparent volume is 46.1
% Of the fluorescent lamp. 7. A surface protective layer made of an inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is compression-molded at a pressure of 200 kgf / cm ² or more and 5000 kgf / cm ² or less. The volume fraction of the inorganic powder occupying the apparent volume of the molded body obtained from the above is γ- which is produced from aluminum chloride, has a primary particle diameter of about 15 nm, and a specific surface area of about 100 m ² / g by the BET method. The fluorescent lamp according to any one of claims 1 to 5, wherein the substance is a substance exceeding a value of a volume fraction of alumina. 8. A surface protection layer made of an inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is charged when it comes into contact with iron powder having a particle size of about 100 μm. The fluorescent lamp according to claim 1, wherein the fluorescent lamp is a substance having an absolute value of less than 0.58 μC / g. 9. A surface protection layer made of inorganic powder is formed on the surface of the phosphor film on the airtight space side, and the inorganic powder is charged when it comes into contact with iron powder having a particle size of about 100 μm. The absolute value of the quantity is
6. A substance having a secondary particle size of about 15 nm and a specific surface area by a BET method of about 100 m ² / g, which is less than the absolute value of the charge amount of γ-alumina, according to claim 1. Fluorescent lamp. 10. The phosphor coating comprises an inorganic powder other than the phosphor particles at least mixed with or attached to the phosphor particles, wherein the inorganic powder has a pressure of 3000 kgf. The material according to any one of claims 1 to 9, wherein the inorganic powder occupies an apparent volume of more than 46.1% of an apparent volume of a compact obtained by compression molding at a pressure of / cm ^2. Fluorescent lamp. 11. The phosphor coating comprises an inorganic powder other than phosphor particles at least mixed with or attached to the phosphor particles, wherein the inorganic powder has a pressure of 200 kgf. / cm ² or more and 5000kgf / c
The volume fraction of the inorganic powder in the apparent volume of the compact obtained by compression molding at m ² or less is a volume fraction of the inorganic powder produced from aluminum chloride, the primary particle diameter is about 15 nm, and the specific surface area by the BET method is about 100 m ^2. The fluorescent lamp according to any one of claims 1 to 9, wherein the substance is a substance exceeding the value of the volume fraction of γ-alumina which is / g. 12. The fluorescent lamp according to claim 1, wherein said inorganic powder has a particle size of 1 to 100 nm. 13. The inorganic powder according to claim 1, wherein the specific surface area by the BET method is 80 m ² / g or more.
The fluorescent lamp according to any one of the above. 14. A fluorescent lamp according to any one of claims 1 to 5, and an energy which is disposed inside or outside said translucent airtight container to supply energy to said discharge medium. A discharge lamp lighting device, comprising: a supply unit; and a lighting device for lighting the fluorescent lamp via the energy supply unit.