JP3498738B2 - Fluorescent lamp - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp which is a lamp using a low pressure mercury vapor discharge.

[0002]

2. Description of the Related Art Generally, in a fluorescent lamp, mercury is enclosed in the lamp container in order to emit light from a fluorescent material adhered to the inner surface of the lamp container such as a glass bulb.
Light having an excitation wavelength of 254 nm of mercury is used.

In recent years, from the viewpoint of environmental protection, there is an increasing demand for reducing the amount of mercury used in fluorescent lamps.
There is a demand for development of a technique for suppressing the mercury consumption in the lamp container.

Mercury in a conventional fluorescent lamp is such that mercury diffuses into a glass bulb, sodium (Na) diffused from the glass bulb reacts with mercury to form an amalgam, or mercury is adsorbed on a phosphor. As a result, it is gradually consumed with the lapse of usage time.

In order to prevent mercury from diffusing into the glass bulb and reacting with sodium ions from the glass bulb, a conventional fluorescent lamp has an alumina protective film layer formed on the inner surface of the glass bulb.

The present inventors measured the ion count number of mercury in a conventional fluorescent lamp using a secondary ion mass spectrometer in order to consider the consumption of mercury in the conventional fluorescent lamp. FIG. 15 shows the analysis result,
It is a graph which shows the secondary ion intensity of mercury in the fluorescent substance layer, the alumina protective film layer, and the glass bulb of the conventional three wavelength region light emission type fluorescent lamp. As shown in FIG. 15, in the conventional fluorescent lamp, a large amount of mercury was adsorbed on the phosphor layer and consumed.

As described above, in the conventional fluorescent lamp, although the reaction between the mercury enclosed in the lamp vessel and the sodium ion of the glass bulb is suppressed, a considerable amount of mercury is absorbed in the phosphor layer and consumed. It had been. Moreover, the amount of mercury consumed increases as the fluorescent lamp is used.

For this reason, in the lamp container of the conventional fluorescent lamp, mercury, which is a substance harmful to the global environment and whose use amount is desired to be as small as possible, greatly exceeds the amount required for light emission, and is large. Had been used.

A conventional technique for preventing the adsorption of mercury on the surface of the phosphor layer is disclosed in Japanese Patent Laid-Open No. 4-245162. The conventional technique disclosed in this publication aims at suppressing a so-called blackening phenomenon, which is a phenomenon in which a lamp container is darkened by mercury in a fluorescent lamp, and preventing a decrease in luminous flux. In order to achieve the above object, the fluorescent lamp disclosed in this publication forms a coating on the inner surface of the phosphor layer, and the coating reduces the adsorption of mercury to the phosphor layer to suppress the blackening phenomenon. Was to be.

[0010]

In the conventional fluorescent lamp (Japanese Patent Laid-Open No. 4-245162) constructed as described above, the coating formed on the inner surface of the phosphor layer has a so-called sandy space. It is a thing. Therefore, it has been difficult to reliably prevent mercury from entering the phosphor layer and the like. Therefore, in this prior art, it was not possible to significantly reduce the mercury consumption of the fluorescent lamp and to reduce the amount of mercury to be sealed in the lamp container.

The present invention prevents the adsorption of mercury to the phosphor layer and the like, and also prevents the reaction between sodium and mercury in the glass bulb to set the amount of mercury to be sealed in advance to the minimum necessary for light emission. It is an object of the present invention to provide a fluorescent lamp that can be manufactured and a method of manufacturing the same.

[0012]

In the fluorescent lamp according to the present invention, a mixed film of a phosphor and a metal oxide made of a substance that transmits a light of a wavelength of 254 nm is formed on the inner surface of a lamp container in which mercury is sealed. Between the thin film and the inner surface of the lamp vessel, the mixed film is a thin film of the metal oxide continuously formed on the intermediate layer surface of the phosphor on the surface near the center of the tube. A thin film , which is a connection body of the metal oxide formed in a gap between particles of the phosphor,
The space between the phosphor particles between the inner surface of the lamp and the inner surface of the lamp vessel.
The connecting body formed between them is connected in such a manner that the particles of the phosphor are bridged and there is a gap between the particles of the phosphor.

With such a structure, mercury can be deposited on the phosphor layer and the like.
In addition to preventing adsorption, sodium with the glass bulb
Prevents the reaction with mercury and emits the amount of mercury that should be enclosed beforehand.
Providing a fluorescent lamp that can be set to the minimum required for
Can be offered.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the fluorescent lamp of the present invention will be described below.

In the fluorescent lamp of the present invention, the mixed film of the phosphor and the metal oxide is formed on the inner surface of the lamp container in which mercury is sealed, and the mixed film is formed in the gap between the particles of the phosphor. The metal oxide has a formed connecting body of the metal oxide, and the connecting body forms a continuous bridge between the particles of the phosphor. Therefore, in the fluorescent lamp of the present invention,
The phosphor particles are firmly connected by the metal oxide, and the mercury in the fluorescent lamp is isolated from the glass container. As a result, mercury does not react with sodium in the glass container, and consumption of mercury enclosed in the lamp container is suppressed.

In the fluorescent lamp of the present invention, the first metal oxide continuous between the inner surface of the lamp vessel and the mixed film.
Thin film is formed. Therefore, in the fluorescent lamp of the present invention, the mercury in the fluorescent lamp is reliably separated from the lamp container, and the consumption of mercury in the lamp container is suppressed.

In the fluorescent lamp of the present invention, a continuous second thin film of metal oxide is formed on the inner surface of the mixed film, which is close to the tube center. Therefore, according to the present invention, the phosphor is separated from the mercury by the metal oxide, the chemical deterioration of the phosphor due to the adsorption of mercury is suppressed, and the consumption of mercury due to the adsorption and oxidation of the mercury on the phosphor is prevented. To be done.

In the fluorescent lamp of the present invention, the first metal oxide continuous between the inner surface of the lamp vessel and the mixed film is formed.
Is formed, and a continuous second thin film of metal oxide is formed on the inner surface of the mixed film, which is a surface close to the tube center. Therefore, in the fluorescent lamp of the present invention, the lamp container and the phosphor are isolated from mercury by the metal oxide, and chemical deterioration of the phosphor due to adsorption of mercury is prevented.
Further, according to the present invention, consumption of mercury due to adsorption and diffusion of mercury to the phosphor and the lamp container and oxidation is prevented.

In the fluorescent lamp of the present invention, the metal oxide is made of a substance that transmits light having a wavelength of 254 nm. Therefore, in the fluorescent lamp of the present invention, the excitation wavelength of mercury is 254n.
The light of m almost certainly reaches the phosphor and causes the phosphor to emit light.

In the fluorescent lamp of the present invention, the metal oxide is composed of at least one selected from the group consisting of silicon dioxide, aluminum oxide, hafnium oxide, zirconium oxide, vanadium oxide, niobium oxide and yttrium oxide. Therefore, in the fluorescent lamp of the present invention, the chemical reaction with mercury is prevented by using the metal oxide whose constituent material is an element having a low chemical affinity with mercury.

In the fluorescent lamp of the present invention, the metal oxide is composed of a substance that blocks 50% or more of light near a wavelength of 185 nm. Therefore, according to the present invention, deterioration of the fluorescent material of the fluorescent lamp is prevented.

In the fluorescent lamp of the present invention, the mixed film has phosphorus or boron as an impurity. Therefore, according to the present invention, it is possible to inhibit the movement of sodium in the glass container and suppress the reaction between mercury and sodium.

[0023]

Preferred embodiments of the fluorescent lamp of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a fluorescent lamp, which is a preferred embodiment of the present invention, with a part thereof cut away, and a part thereof is shown enlarged. The layers shown in the enlarged view of FIG. 1 are idealized and drawn flat.

As shown in FIG. 1, the fluorescent lamp of this embodiment has a straight tube-shaped glass bulb 2 serving as a lamp vessel, and electrodes 1 provided at both ends of the glass bulb 2. A mixed film 3 having a phosphor is formed on the inner surface of the glass bulb 2. Further, mercury is enclosed in the glass bulb 2 together with the rare gas.

The fluorescent lamp of this embodiment is a straight tube fluorescent lamp or a ring fluorescent lamp having a low load instead of a high load, and a fluorescent lamp having a load of about 0.35 W / cm is used.

FIG. 2 is an enlarged sectional view showing the mixed film 3 and the like having a phosphor in the fluorescent lamp of this embodiment. As shown in FIG. 2, the mixed film 3, so as to fill the gaps between the phosphor particles 7, chemically stable metal oxides vitrified, in this embodiment the connecting member 6 consisting of yttrium oxide fluorescent Formed in the middle layer of the body . Further, between the glass bulb 2 and the mixed film 3, a first thin film 4 made of yttrium oxide, which is the same metal oxide as the connecting body 6, is formed of a phosphor so as to cover the inner surface of the glass bulb 2 . under
It is formed in the layer portion . Furthermore, the inner surface of the mixed film 3 (see FIG.
The upper surface of the phosphor is formed by the second thin film 5 made of yttrium oxide, which is the same metal oxide as that of the connecting body 6.
The upper layer is covered. Since the vitrified metal oxide is formed of yttrium oxide, it transmits light of 254 nm which is the excitation wavelength of mercury. Therefore, the phosphor particles 7 in the mixed film 3 emit light upon receiving light of 254 nm which is the excitation wavelength of mercury.

Note that the inventors of the present invention, the fluorescent lamp of the present embodiment, SEM (scanning electron microscope) and XMA (X) for the connecting body 6, the first thin film 4 and the second thin film 5 of the mixed film 3 described above. Its presence was confirmed by an analyzer such as a line microanalyzer).

In the above embodiment, yttrium oxide was used as the metal oxide, but in addition, silicon dioxide, aluminum oxide, hafnium oxide, zirconium oxide,
Similar results were obtained with vanadium oxide and niobium oxide.

Next, in this embodiment, the first thin film 4,
The light transmittance of the metal oxide used for the second thin film 5 and the connector 6 will be described. 3 to 9 are graphs showing the transmittance of ultraviolet light in the above-mentioned various metal oxide film bodies (thickness: about 0.5 μm).

FIG. 3 shows the transmittance of silicon dioxide (SiO ₂ ), FIG. 4 shows the transmittance of aluminum oxide (Al ₂ O ₃ ), and FIG. 5 shows the transmittance of hafnium oxide (HfO ₂ ). As shown in FIGS. 3 to 5, the film bodies made of these metal oxides transmit almost 100% of the light of 254 nm which is the excitation wavelength of mercury. Therefore, the first thin film 4, the second thin film 5, and the connector 6 formed of silicon dioxide, aluminum oxide, or hafnium oxide do not adversely affect the light emission of the phosphor particles 7.

FIG. 6 shows zirconium oxide (ZrO ₂ ), FIG. 7 shows vanadium oxide (V ₂ O ₅ ), and FIG. 8 shows niobium oxide (N ₂ O ₅ ).
b ₂ O ₅ ), and FIG. 9 shows the respective transmittances in the case of yttrium oxide (Y ₂ O ₃ ).

As shown in FIG. 6, zirconium oxide transmits almost 95% of light having a wavelength of 254 nm, which is the excitation wavelength of mercury. Therefore, the first formed by zirconium oxide
The thin film 4, the second thin film 5 and the connecting body 6 of the
Does not adversely affect the light emission of. The zirconium oxide film has a low transmittance for light having a wavelength of 200 nm or less, and has a blocking function of 80% or more.

As shown in FIGS. 7 to 9, each of vanadium oxide, niobium oxide and yttrium oxide transmits approximately 85% of light having a wavelength of 254 nm which is the excitation wavelength of mercury. Therefore, the first thin film 4, the second thin film 5, and the connector 6 formed of vanadium oxide, niobium oxide, or yttrium oxide do not adversely affect the light emission of the phosphor particles 7. The yttrium oxide film has a low transmittance for light having a wavelength of 200 nm or less and a blocking action of 70% or more.

Next, the effect of preventing mercury from adhering to the phosphor in the fluorescent lamp of this embodiment will be described with reference to FIG. FIG. 10 is a conceptual diagram showing the fluorescent lamp of this embodiment in a partially cutaway manner.

In FIG. 10, an electron 21 emitted from the electrode 1 (the movement of the electron 21 is indicated by an arrow a) is a mercury atom 2.
Excite 2. Excited mercury atom 22 (mercury atom 22
Of the excitation wavelength of 254 nm is transmitted through the second thin film 5 and the coupling body 6, and collides with the phosphor particles 7. According to Stokes' law, the phosphor particles 7 emit visible light having a long wavelength by the light having the excitation wavelength of 254 nm of the mercury atoms 22, and the fluorescent lamp is turned on.

When the first thin film 4, the second thin film 5 and the connecting body 6 of this embodiment are made of yttrium oxide or zirconium oxide, the light of the excitation wavelength of mercury near the wavelength of 185 nm is emitted. Virtually blocked. As described above, in the fluorescent lamp having the first thin film 4, the second thin film 5 and the connector 6 formed of zirconium oxide or yttrium oxide, the light having a wavelength of 185 nm that particularly deteriorates the phosphor particles 7 is metal-oxidized. Since it is blocked by the object, the deterioration of the phosphor particles 7 is significantly suppressed.

The inner side surface of the mixed film 3 of the present embodiment is a vitrified flat second surface formed so as to cover the phosphor particles 7.
Is covered with a thin film 5 of. Therefore, even if the mercury atoms 22 move by Brownian motion, they do not collide with the phosphor particles 7 in the mixed film 3, and the mercury atoms 22 do not collide.
There is no danger of it being adsorbed on and producing mercury oxide.

Furthermore, in this embodiment, since the first thin film 4 is formed between the mixed film 3 and the glass bulb 2, there is no possibility that the mercury atoms 22 reach the glass bulb 2. Therefore, the sodium atom 23 contained in the glass bulb 2 does not react with the mercury atom 22 to generate amalgam.

As described above, the fluorescent lamp of this embodiment is
The mercury atoms 22 are not adsorbed on the phosphor particles 7 and are not oxidized. Further, it does not react with the sodium atom 23 of the glass bulb. For these reasons, the amount of mercury consumed in the glass bulb 2 can be greatly suppressed, and the amount of mercury enclosed in the fluorescent lamp can be kept to the minimum amount required for light emission.

Next, the penetration state of mercury into the metal oxide material used as the first thin film 4, the second thin film 5 and the connector 6 of this embodiment will be described with reference to FIG.

FIG. 11 is a graph showing the diffusion amount of mercury in various materials in the depth direction. In FIG. 11, as the amount of diffusion of mercury, the number of counting mercury ions was measured using SIMS (secondary ion mass spectrometer).

The lamp used in this measurement is (a)
A lamp with only a clear bulb made of soda glass,
(B) A lamp made of an aluminum oxide film having a thickness of about 0.5 μm on the inner surface of the same clear bulb, and (c) a yttrium oxide film having a thickness of about 0.5 μm on the inner surface of the same clear bulb. It is a lamp. After these lamps were lit for 2000 hours, the amount of diffusion of mercury in each lamp in the depth direction was analyzed. The result is shown in FIG.

In FIG. 11, a curve A shows a mercury diffusion curve in a clear valve made of only soda glass, and a curve B shows a mercury diffusion curve into an aluminum oxide film on the clear valve. Curve C shows a diffusion curve of mercury into the yttrium oxide film on the clear valve.

In FIG. 11, the horizontal axis represents depth (μ
m) is shown on a normal decimal scale, and the vertical axis shows the count number (number) of mercury ions on a logarithmic scale.

As shown in FIG. 11, the lamp formed with the metal oxide film has a very small amount of mercury intrusion and has an effect of preventing the adsorption of mercury to the phosphor particles. Therefore, it was experimentally confirmed that the fluorescent lamp having the metal oxide film body of the present example suppresses the consumption of mercury.

Next, the amount of mercury used in the fluorescent lamp of this embodiment will be described.

In the following description, a fluorescent lamp (straight tube type 20 W; FL20SS.EX-N / 18) of an embodiment using yttrium oxide as a metal oxide film body will be described as an example with reference to FIG. To do.

FIG. 12 shows a fluorescent lamp having only a phosphor layer,
It is the graph which analyzed the relationship between luminous flux and lighting time in the fluorescent lamp using yttrium oxide as a metal oxide.

The amount of mercury used in the conventional fluorescent lamp is about 10 mg when the straight tube shape is 20 W, but the amount of mercury used is 0.5 mg in the straight tube shape 20 W fluorescent lamp of this embodiment used in this analysis. Limited to a very small amount.

In FIG. 12, a curve D shows the luminous flux change curve of the fluorescent lamp of the comparative example having only the phosphor layer, and a curve E shows the luminous flux change curve of the fluorescent lamp of this embodiment having the metal oxide of yttrium oxide. ing.

As is apparent from the graph of FIG. 12, the fluorescent lamp having only the phosphor layer (curve D) disappeared because mercury disappeared in about 2000 hours. On the other hand, the fluorescent lamp having the metal oxide of yttrium oxide (curve E) has a luminous flux maintenance factor of 90% at the time of 5000 hours.
Was maintained.

From the result of the graph shown in FIG. 12, the fluorescent lamp of the present embodiment has the mixed film 3 containing metal oxide, the first thin film 4 and the second thin film 5 made of metal oxide. There is. Therefore, it was confirmed that the fluorescent lamp of this example has an effect of significantly reducing the amount of mercury used.

Next, the consumption of mercury enclosed in the fluorescent lamp will be described. In order to measure the mercury consumption in fluorescent lamps, we used the cataphoresis method (Cataphoresis-analysis), which allows non-destructive quantitative analysis of mercury in fluorescent lamps. FIG. 13 is a graph that analyzes the relationship between the amount of mercury consumed and the lighting time.

The fluorescent lamp used in this analysis is a straight tube type 20 W fluorescent lamp (FL20SS.EX-N).
/ 18) was charged with 3.0 mg of mercury. In FIG. 13, a curve F shows a mercury consumption curve of a fluorescent lamp having only a phosphor layer, and a curve G shows a mercury consumption curve of a fluorescent lamp having a metal oxide of yttrium oxide.

As is clear from the graph of FIG. 13, the fluorescent lamp having the metal oxide consumes much less mercury than the fluorescent lamp having only the phosphor layer. From the graph of FIG. 13, the fluorescent lamp having the metal oxide has about 6 times more than 5000 fluorescent lamps when the fluorescent lamp has only the phosphor layer.
It can be seen that the mercury consumption of 5% can be reduced.

Next, a method of manufacturing the fluorescent lamp of the present invention will be described with reference to the flowchart shown in FIG.

In step 1, a phosphor material, for example, a three-wavelength band light emitting type phosphor material is prepared. Next, this phosphor material is applied to the inner surface of the glass bulb 2 and dried,
A phosphor layer is formed (step 2). Then, in step 3, a metal alkoxide, for example, yttrium isopropoxide is dissolved in butyl acetate on the phosphor layer, coated, dried at about 100 ° C. for about 15 minutes, and hydrolyzed. Further, since alcohol is generated as the polymerization reaction of the metal alkoxide progresses, this alcohol is vaporized and removed.

Then, in step 4, the phosphor layer is heat-treated (about 500 ° C. for about 2 minutes) in a sintering furnace at appropriate times to mix the film 3, the first thin film 4 and the second thin film 5.
To form.

After that, the fluorescent lamp of the present embodiment is manufactured through a method for manufacturing a fluorescent lamp including the following steps as usual: That is, the glass bulb is subjected to exhaust treatment (step 5), and the glass bulb is placed in the glass bulb. These are the steps of filling the rare gas and mercury (step 6) and sealing the glass bulb (step 7).

In the above manufacturing method, the phosphor layer is formed of the phosphor material and then the metal compound is applied, but the manufacturing method of the fluorescent lamp of the present invention is not limited to the above manufacturing method. That is, it is possible to previously mix the metal compound and the phosphor material to form the mixed film 3 on the inner surface of the glass bulb. However, when the mixed film is formed by previously mixing the metal compound and the phosphor material, steps 3 and 4 in the above manufacturing method are not necessary, and it is necessary to change the setting of the drying time and the temperature in step 1. .

The metal compound of the metal alkoxide of the present embodiment is not an oxide (MOx) having a low molecular structure such as a film made of a metal oxide, but an oxide having a high molecular structure (M-
A strong film body or the like is formed by using a metal alkoxide from which O-MO -...) is obtained.

As an example of the metal oxide film body, yttrium isopropoxide when the metal element is yttrium (Y) is taken as an example, and a process for producing a metal oxide formed between phosphor particles or the like is performed using a metal alkoxide. It is as follows based on the flow of the chemical reaction.

[0064]

[Chemical 1]

Yttrium isopropoxide is hydrolyzed to substitute the isopropyl group (-OC ₃ H ₇ ) of yttrium isopropoxide with a hydroxyl group (-OH) to produce propanol. This yttrium compound is further dehydrated and polymerized. Repeat this reaction at about 500 ℃
By performing the annealing treatment of ( ₃ ), a continuous metal oxide of yttrium oxide (Y ₂ O ₃ ) is formed.

In the production method of the present invention, a metal oxide film or the like in which yttrium oxide (Y ₂ O ₃ ) is continuous is formed even when an organometallic compound represented by an alkyl group is used as a starting material. . The general chemical reaction is shown below.

[0067]

[Chemical 2]

As another example of the metal oxide film body, taking tetraethoxysilane (TEOS) when the metal element is silicon (Si) as an example, formation of the metal oxide formed between the phosphor particles and the like. The process is shown below based on the flow of chemical reaction of metal alkoxide.

[0069]

[Chemical 3]

In tetraethoxysilane, the ethoxy group (-OC ₂ H ₅ ) of tetraethoxysilane is replaced with a hydroxyl group (-OH) by hydrolysis, and it is converted to silanol.
Ethanol is produced. The silanol is further dehydrated and polymerized. By repeating this reaction and performing an annealing treatment at about 500 ° C., a film body of a metal oxide having strong SiO ₂ is formed.

Further, in the method for manufacturing a fluorescent lamp of the present invention, the starting material for forming the metal oxide is an inorganic metal compound such as a metal nitrate, a metal sulfate, a metal carboxylate, a metal β-diketonate complex or an organic compound. Metal compounds can be used. When such a metal compound is used, the organometallic compound is oxidized by a thermal decomposition reaction without going through a hydrolysis reaction process, and a film body similar to the above metal oxide is formed as a final product. It was confirmed.

In order to form a film body or the like through the thermal decomposition reaction and the oxidation reaction, any of the above-mentioned inorganic metal compounds and organic metal compounds is annealed at a temperature in the range of 300 ° C to 800 ° C. It is preferable. This temperature range was confirmed by differential thermal analysis.

In the above-mentioned embodiment, the case where at least one pair of electrodes is provided in the lamp container has been described, but the fluorescent lamp of the present invention can be applied to an electrodeless fluorescent lamp.

Further, in the fluorescent lamp of the present invention, the following metal oxides can be similarly used in addition to the above-mentioned yttrium oxide and silicon dioxide. For example, aluminum oxide, hafnium oxide, zirconium oxide, vanadium oxide, and niobium oxide may be used alone, or two or more selected from them may be used. Also in this case, it can be carried out in the same manner as the above-mentioned yttrium oxide and silicon dioxide.

In the fluorescent lamp of the present invention, an antioxidant is added to the metal alkoxide solution to form a mixed film to prevent the oxidation of mercury and suppress the generation of mercury oxide in the fluorescent lamp. be able to.

In addition, in the fluorescent lamp of the present invention, phosphorus or boron is added as an impurity to the metal alkoxide solution to form a mixed film, so that the migration of sodium from the glass bulb is prohibited and the mixture of sodium and mercury is prevented. The reaction can be surely suppressed.

Also, instead of the metal alkoxide solution, a metal nitrate, a metal sulfate, a metal carboxylate, a metal β-diketonate complex may be used, and an antioxidant and phosphorus or button may be added to the above effect. Has the same effect as.

The technique of the fluorescent lamp of the present invention can be applied not only to a normal starter type fluorescent lamp, but also to a rapid starter type fluorescent lamp having a conductive film.

[0079]

As described above, according to the fluorescent lamp of the present invention, the fluorescent substance is formed by forming the mixed film having the coupling substance and the fluorescent substance which transmits the light having the excitation wavelength of 254 nm on the inner surface of the lamp container. It is possible to prevent the adsorption of mercury on the. Further, by doing so, the amount of mercury to be sealed in the fluorescent lamp can be suppressed to the minimum amount required for light emission. Therefore, according to the present invention, it is possible to significantly reduce the amount of mercury used, which is a problem from the viewpoint of environmental protection,
A highly safe fluorescent lamp can be provided.

Further, in the fluorescent lamp of the present invention, the first thin film was formed between the glass container and the mixed film, and the second thin film was formed on the inner surface of the mixed film, which was close to the tube center. For this reason, the mercury enclosed in the glass container is reliably separated from the glass container and the phosphor, the diffusion and adsorption of mercury to the glass container and the phosphor are prevented, and the consumption of mercury is significantly reduced. . As a result, according to the present invention, useless use of mercury can be eliminated, and the amount of use of mercury, which is a problem in terms of pollution, can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a fluorescent lamp according to an embodiment of the present invention with a part thereof cut away, and an enlarged view showing a part of the same.

FIG. 2 is an enlarged sectional view showing a mixed film and the like in the fluorescent lamp of the present invention.

FIG. 3 is a diagram showing light transmittance of a silicon dioxide film.

FIG. 4 is a diagram showing light transmittance of an aluminum oxide film.

FIG. 5 is a diagram showing light transmittance of a hafnium oxide film.

FIG. 6 is a diagram showing light transmittance of a zirconium oxide film.

FIG. 7 is a diagram showing light transmittance of a vanadium oxide film.

FIG. 8 is a diagram showing light transmittance of a niobium oxide film.

FIG. 9 is a diagram showing light transmittance of an yttrium oxide film.

FIG. 10 is a conceptual diagram in which a part of the fluorescent lamp of the present invention is cut away.

FIG. 11 is a diagram showing the relationship between the depth of a yttrium oxide film, an aluminum oxide film, etc. and the amount of diffusion of mercury.

FIG. 12 is a diagram showing the relationship between the luminous flux maintenance factor and the lighting time of the fluorescent lamp of the present invention and a conventional fluorescent lamp.

FIG. 13 is a diagram showing the relationship between mercury consumption and lighting time in a fluorescent lamp of the present invention and a conventional fluorescent lamp.

FIG. 14 is a flowchart for explaining a method of manufacturing a fluorescent lamp of the present invention.

FIG. 15 is a diagram showing a diffusion amount of mercury in a conventional fluorescent lamp (40 W).

[Explanation of symbols]

2 glass bulbs 3 mixed film 4 First thin film 5 Second thin film 6 connected body 7 Phosphor particles

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A 64-2247 (JP, A) JP-A 60-109164 (JP, A) JP-A 7-230788 (JP, A) JP-A 6- 49445 (JP, A) JP-A-5-326430 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 61/46 H01J 61/35

Claims (4)

(57) [Claims] 1. A mixed film of a phosphor and a metal oxide made of a substance that transmits light having a wavelength of 254 nm is formed on the inner surface of a lamp container in which mercury is sealed, and the mixed film is formed at the center of the tube. A thin film of the metal oxide continuously formed on the intermediate layer surface of the phosphor on a close surface, and formed in the gap of the particles of the phosphor between the thin film and the inner surface of the lamp vessel. The fluorescent material between the thin film and the inner surface of the lamp vessel , which is a connection body of the metal oxide.
The fluorescent lamp, wherein the connecting body formed in the gap between the particles of the body is connected in such a manner that the particles of the phosphor are in a bridged state and the particles of the phosphor have a gap. Wherein said metal oxide is silicon dioxide, aluminum oxide, hafnium oxide, zirconium oxide, vanadium oxide, claim 1 Symbol, characterized in that it consists of at least one selected from the group consisting of niobium oxide and yttrium oxide Mounted fluorescent lamp. 3. A process according to claim 1 Symbol mounting of the fluorescent lamp, characterized in that it consists of a material the metal oxide blocking light near a wavelength of 185 nm 50% or more. 4. The method of claim 1 Symbol placement of fluorescent lamps the mixed layer is characterized by having a phosphorus or boron as an impurity.