JP3669368B2 - Fluorescent lamp - Google Patents

Description

  The present invention relates to a fluorescent lamp which is a lamp using a discharge of low-pressure mercury vapor.

  In general, in a fluorescent lamp, mercury is enclosed in a lamp vessel to emit light emitted from a phosphor deposited on the inner surface of a lamp vessel made of a glass bulb or the like, and light having an excitation wavelength of 254 nm is used. ing.

  In recent years, from the viewpoint of environmental protection, there has been an increasing demand for reducing the amount of mercury used in fluorescent lamps, and there is a need for the development of technology for suppressing the mercury consumption in the lamp vessel.

  Mercury in a conventional fluorescent lamp is diffused into the glass bulb, sodium (Na) diffused from the glass bulb reacts with mercury to produce amalgam, or mercury is adsorbed to the phosphor, etc. Consumed gradually over time.

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

  In order to consider the consumption of mercury in the conventional fluorescent lamp, the present inventors measured the ion count number of mercury in the conventional fluorescent lamp using a secondary ion mass spectrometer. FIG. 15 is a graph showing the secondary ion intensity of mercury in the phosphor layer, the alumina protective film layer, and the glass bulb of the conventional three-wavelength-range type fluorescent lamp. As shown in FIG. 15, in the conventional fluorescent lamp, a lot of mercury is adsorbed and consumed by the phosphor layer.

  As described above, in the conventional fluorescent lamp, the reaction between mercury enclosed in the lamp vessel and sodium ions in the glass bulb is suppressed, but a considerable amount of mercury is adsorbed and consumed by the phosphor layer. . In addition, the consumption of mercury increases with the passage of time of use of the fluorescent lamp.

  For this reason, mercury is used in lamp containers of conventional fluorescent lamps, a substance that is harmful to the global environment and it is desirable to reduce the amount used as much as possible. It was.

  As a conventional technique for preventing the adsorption of mercury on the surface of the phosphor layer, there is one disclosed in Japanese Patent Laid-Open No. 4-245162. The prior art disclosed in this publication is intended to suppress a so-called blackening phenomenon in which a lamp vessel is darkened by mercury in a fluorescent lamp and to prevent 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 reduces the adsorption of mercury to the phosphor layer by the coating, thereby suppressing the blackening phenomenon. Was.

  In the conventional fluorescent lamp (Japanese Patent Laid-Open No. 4-245162) configured as described above, the coating formed on the inner surface of the phosphor layer has a gap like sand. For this reason, it has been difficult to reliably prevent mercury from entering the phosphor layer or the like. Therefore, in this prior art, the mercury consumption of the fluorescent lamp is greatly reduced, and the amount of mercury to be enclosed in the lamp container cannot be reduced.

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

Fluorescent lamp according to the present invention, the inner surface of the lamp vessel enclosing mercury inside, mixed film is formed between the metal oxide of the phosphor and the polymer structure, the mixed film of the phosphor particles A connecting body of the metal oxide formed in the gap, and the connecting body is connected to the phosphor particles with a gap between the phosphor particles in a continuous bridged state, and further, A continuous first thin film of metal oxide is formed between the inner surface of the lamp vessel and the mixed film .

As described above, according to the fluorescent lamp of the present invention, by forming a mixed film having a polymer-structured metal oxide coupling body and a phosphor that transmits light having an excitation wavelength of 254 nm on the inner surface of the lamp vessel. Further, it is possible to prevent mercury from adsorbing to the phosphor. In addition, the amount of mercury to be enclosed in the fluorescent lamp can be suppressed to the minimum amount necessary for light emission. Therefore, according to the present invention, it is possible to remarkably reduce the amount of mercury used, which is a problem from the viewpoint of environmental protection, and it is possible to provide a highly safe fluorescent lamp.

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

  Hereinafter, embodiments of the fluorescent lamp of the present invention will be described.

  In the fluorescent lamp of the present invention, a mixed film of a phosphor and a metal oxide is formed on the inner surface of a lamp vessel in which mercury is enclosed, and the mixed film is formed in a gap between the phosphor particles. It has the said metal oxide coupling body, The particle | grains of the said fluorescent substance are in the bridge | crosslinking state which continued by the said coupling body. For this reason, 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, a continuous first thin film of metal oxide is formed between the inner surface of the lamp vessel and the mixed film. For this reason, in the fluorescent lamp of the present invention, mercury in the fluorescent lamp is reliably isolated from the lamp vessel, and consumption of mercury in the lamp vessel is suppressed.

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

  In the fluorescent lamp of the present invention, a continuous first thin film of metal oxide is formed between the inner surface of the lamp vessel and the mixed film, and is continuous with the inner surface that is a surface near the tube center of the mixed film. A second thin film of metal oxide is formed. For this reason, in the fluorescent lamp of the present invention, the lamp vessel and the phosphor are isolated from mercury by the metal oxide, and chemical deterioration of the phosphor due to mercury adsorption is prevented. Further, according to the present invention, mercury consumption due to adsorption and diffusion and oxidation to mercury phosphors and lamp vessels is prevented.

  In the fluorescent lamp of the present invention, the metal oxide is made of a material that transmits light having a wavelength of 254 nm. For this reason, in the fluorescent lamp of the present invention, the light having an excitation wavelength of 254 nm of mercury 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. For this reason, in the fluorescent lamp of the present invention, a chemical reaction with mercury is prevented by using a metal oxide whose constituent is an element having a low chemical affinity with mercury.

  In the fluorescent lamp of the present invention, the metal oxide is made of a material that blocks 50% or more of light in the vicinity of a wavelength of 185 nm. For this reason, according to this invention, deterioration of the fluorescent substance of the fluorescent lamp is prevented.

  In the fluorescent lamp of the present invention, the mixed film has phosphorus or boron as an impurity. For this reason, according to this invention, the movement of sodium of a glass container can be prohibited and reaction of mercury and sodium can be suppressed.

  Hereinafter, preferred embodiments of the fluorescent lamp of the present invention will be described 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, partially cut away, and shows a part thereof enlarged. Each layer shown in the enlarged view of FIG. 1 is idealized and drawn flat.

  As shown in FIG. 1, the fluorescent lamp of the present 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 a rare gas.

  The fluorescent lamp of this example is a straight tube fluorescent lamp or a ring-shaped fluorescent lamp that is not a high load but a low load, and has a load equivalent to 0.35 W / cm.

  FIG. 2 is an enlarged cross-sectional view of the mixed film 3 having a phosphor in the fluorescent lamp of the present embodiment. As shown in FIG. 2, the mixed film 3 is formed with a linked body 6 made of vitrified chemically stable metal oxide, yttrium oxide in this embodiment, so as to fill the gaps between the phosphor particles 7. Has been. In addition, a first thin film 4 made of yttrium oxide, which is the same metal oxide as that of the coupling body 6, is formed between the glass bulb 2 and the mixed film 3 so as to cover the inner surface of the glass bulb 2. Yes. Furthermore, the inner surface (the upper surface in FIG. 2) of the mixed film 3 is covered with a second thin film 5 made of yttrium oxide, which is the same metal oxide as the coupling body 6. Since the vitrified metal oxide is formed of yttrium oxide, it transmits light at 254 nm, which is the excitation wavelength of mercury. For this reason, the phosphor particles 7 in the mixed film 3 emit light upon receiving light of 254 nm which is the excitation wavelength of mercury.

  In addition, the inventors of the fluorescent lamp of the present embodiment use the SEM (scanning electron microscope) and the XMA (X-ray microanalyzer) for the connecting body 6 of the mixed film 3, the first thin film 4 and the second thin film 5 described above. ) Etc., and the presence was confirmed.

  In the above examples, yttrium oxide was used as the metal oxide, but similar results were obtained using silicon dioxide, aluminum oxide, hafnium oxide, zirconium oxide, vanadium oxide, and niobium oxide.

  Next, the light transmittance of the metal oxide used in the first thin film 4, the second thin film 5, and the coupling body 6 in this example will be described. 3 to 9 are graphs showing the transmittance of ultraviolet light in the various metal oxide film bodies (thickness: about 0.5 μm).

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

6 shows zirconium oxide (ZrO ₂ ), FIG. 7 shows vanadium oxide (V ₂ O ₅ ), FIG. 8 shows niobium oxide (Nb ₂ O ₅ ), and FIG. 9 shows yttrium oxide (Y ₂ O ₃ ). The transmittance is shown.

  As shown in FIG. 6, zirconium oxide transmits about 95% of light at 254 nm, which is the excitation wavelength of mercury. For this reason, the 1st thin film 4, the 2nd thin film 5, and the coupling body 6 formed with the zirconium oxide do not have a bad influence with respect to the light emission of the fluorescent substance particle 7. FIG. The zirconium oxide film body has a low transmittance with respect to light having a wavelength of 200 nm or less, and has a blocking action 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 at 254 nm, which is the excitation wavelength of mercury. For this reason, the 1st thin film 4, the 2nd thin film 5, and the connection body 6 formed with vanadium oxide, niobium oxide, or yttrium oxide do not have a bad influence with respect to the light emission of the fluorescent substance particle 7. FIG. The film body of yttrium oxide has a low transmittance with respect to light having a wavelength of 200 nm or less, and has 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 the present embodiment partially broken.

  In FIG. 10, electrons 21 emitted from the electrode 1 (the movement of the electrons 21 is indicated by an arrow a) excite mercury atoms 22. Ultraviolet light c having an excitation wavelength of 254 nm from the excited mercury atoms 22 (the movement of the mercury atoms 22 is indicated by an arrow b) passes through the second thin film 5 and the coupling body 6 and collides with the phosphor particles 7. The phosphor particles 7 emit visible light having a long wavelength by light having an excitation wavelength of 254 nm of the mercury atoms 22 according to Stokes' law, and the fluorescent lamp is turned on.

  When the first thin film 4, the second thin film 5, and the connection body 6 of the present embodiment are formed of yttrium oxide or zirconium oxide, the light having the excitation wavelength of mercury near the wavelength of 185 nm is substantially reduced. Blocked. Thus, in the fluorescent lamp having the first thin film 4, the second thin film 5, and the coupling body 6 formed of zirconium oxide or yttrium oxide, light with a wavelength of 185 nm that particularly deteriorates the phosphor particles 7 is subjected to metal oxidation. Since it is blocked by the object, the deterioration of the phosphor particles 7 is greatly suppressed.

  The inner side surface of the mixed film 3 of the present embodiment is covered with a flat second thin film 5 that is formed to cover the phosphor particles 7 and is vitrified. For this reason, even if the mercury atoms 22 move due to Brownian motion, they do not collide with the phosphor particles 7 in the mixed film 3, and the mercury atoms 22 may be adsorbed on the phosphor particles 7 to form mercury oxide. Absent.

  Furthermore, in the present 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, in the fluorescent lamp of this embodiment, the mercury atoms 22 are not adsorbed on the phosphor particles 7 and oxidized. Moreover, 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 reduced, and the amount of mercury contained in the fluorescent lamp can be kept to the minimum amount necessary for light emission.

  Next, an intrusion state of mercury in the metal oxide material used as the first thin film 4, the second thin film 5, and the coupling body 6 of this example 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, the mercury ion count was measured using SIMS (secondary ion mass spectrometer) as the diffusion amount of mercury.

  The lamp used in this measurement includes (a) a lamp having only a clear bulb made of soda glass, (b) a lamp in which an aluminum oxide film body is formed with a thickness of about 0.5 μm on the inner surface of the same clear bulb, c) A lamp in which an yttrium oxide film body having a thickness of about 0.5 μm is formed on the inner surface of the same clear bulb. After these lamps were lit for 2000 hours, the diffusion amount 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 only of soda glass, and a curve B shows a mercury diffusion curve in 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 the depth (μm) on a normal decimal scale, and the vertical axis represents the mercury ion count (number) on a logarithmic scale.

  As shown in FIG. 11, the lamp in which the metal oxide film is formed has an extremely small amount of mercury intrusion, and has an effect of preventing the adsorption of mercury to the phosphor particles. For this reason, it has been experimentally confirmed that the fluorescent lamp having the metal oxide film body of this 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, an example of a fluorescent lamp (straight tube shape 20W; FL20SS · EX-N / 18) using yttrium oxide as a metal oxide film body will be described with reference to FIG.

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

  The amount of mercury used in the conventional fluorescent lamp is about 10 mg in the case of the straight tube shape 20 W, but the fluorescent lamp of the present embodiment of the straight tube shape 20 W used in this analysis has a very small amount of mercury as 0.5 mg. Restricted.

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

  As is clear from the graph of FIG. 12, the fluorescent lamp (curve D) having only the phosphor layer disappeared in about 2000 hours, with mercury disappearing. On the other hand, the fluorescent lamp (curve E) having a metal oxide of yttrium oxide maintained a luminous flux maintenance factor of 90% when 5000 hours passed.

  From the result of the graph shown in FIG. 12, the fluorescent lamp of this example has a mixed film 3 having a metal oxide, and a first thin film 4 and a second thin film 5 made of a metal oxide. For this reason, it was confirmed that the fluorescent lamp of this example has an effect of greatly reducing the amount of mercury used.

  Next, the consumption amount of mercury sealed in the fluorescent lamp will be described. In order to measure the mercury consumption in the fluorescent lamp, a cataphoresis method (Cataphoresis-analysis) was used which can quantitatively analyze the mercury content in the fluorescent lamp without destruction. FIG. 13 is a graph analyzing the relationship between mercury consumption and lighting time.

  In the fluorescent lamp used in this analysis, 3.0 mg of mercury was sealed in a straight tube-shaped 20 W fluorescent lamp (FL20SS · EX-N / 18). 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 apparent from the graph of FIG. 13, the fluorescent lamp having the metal oxide consumes very little mercury compared to the fluorescent lamp having only the phosphor layer. From the graph of FIG. 13, it can be understood that a fluorescent lamp having a metal oxide can reduce mercury consumption by about 65% when lit for 5000 hours, compared with a fluorescent lamp having only a phosphor layer.

  Next, the manufacturing method of 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 emission type phosphor material is prepared. Next, this phosphor material is applied to the inner surface of the glass bulb 2 and dried to form a phosphor layer (step 2). Thereafter, in step 3, a metal alkoxide, for example, yttrium isopropoxide is dissolved in butyl acetate on the phosphor layer, applied, dried at about 100 ° C. for about 15 minutes, and the metal alkoxide is hydrolyzed. Furthermore, since alcohol is generated as the polymerization reaction of the metal alkoxide proceeds, this alcohol is vaporized and removed.

  Thereafter, in step 4, the phosphor layer is subjected to a timely heat treatment (about 500 ° C., about 2 minutes) in a sinter furnace to form the mixed film 3, the first thin film 4, and the second thin film 5.

  Thereafter, the fluorescent lamp of the present embodiment is manufactured through a fluorescent lamp manufacturing method including the following steps as usual: That is, the glass bulb is exhausted (step 5), and the rare gas and Mercury is sealed (Step 6), and the glass bulb is sealed (Step 7).

  In the above manufacturing method, the phosphor layer is formed from the phosphor material, and then the metal compound is applied. However, the manufacturing method of the fluorescent lamp of the present invention is not limited to the above manufacturing method. That is, the mixed film 3 can be formed on the inner surface of the glass bulb by previously mixing the metal compound and the phosphor material. However, when the metal compound and the phosphor material are mixed in advance to form a mixed film, Step 3 and Step 4 in the above manufacturing method are not necessary, and the setting of the drying time and temperature in Step 1 is necessary. .

  The metal compound of the metal alkoxide of this example is not an oxide (MOx) having a molecular structure such as a film body made of a metal oxide but having a low molecular structure. A strong film body or the like is formed using the metal alkoxide obtained from (...).

  As an example of a metal oxide film, yttrium isopropoxide when the metal element is yttrium (Y) is used as an example, and the metal oxide formation process formed between phosphor particles is a chemical reaction of metal alkoxide. Based on this flow, it is as follows.

Yttrium isopropoxide is hydrolyzed to replace 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. By repeating this reaction and performing an annealing process at about 500 ° C., a continuous metal oxide of yttrium oxide (Y ₂ O ₃ ) is formed.

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

  As another example of the metal oxide film, tetraethoxysilane (TEOS) when the metal element is silicon (Si) is used as an example, and the metal oxide formation process formed between the phosphor particles is metal Based on the flow of chemical reaction of alkoxide, it is as follows.

Tetraethoxysilane is hydrolyzed to replace the ethoxy group (—OC ₂ H ₅ ) of tetraethoxysilane with a hydroxyl group (—OH), thereby changing to silanol, and ethanol is generated. Silanol further dehydrates and polymerizes. By repeating this reaction and performing an annealing process at about 500 ° C., a strong SiO ₂ metal oxide film or the like is formed.

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

  In addition, any of the above-described inorganic metal compounds and organometallic compounds are preferably annealed at a temperature in the range of 300 ° C. to 800 ° C. in order to produce a film body and the like through a thermal decomposition reaction and an oxidation reaction. . This temperature range was confirmed by differential thermal analysis.

  In the above-described embodiment, the case where at least a pair of electrodes are provided in the lamp vessel has been described. However, the fluorescent lamp of the present invention can also be implemented for an electrodeless fluorescent lamp.

  Further, in the fluorescent lamp of the present invention, the following metal oxides can be used in the same manner in addition to the yttrium oxide and silicon dioxide. For example, aluminum oxide, hafnium oxide, zirconium oxide, vanadium oxide and niobium oxide, or a combination of two or more selected from them are used. In this case as well, it can be carried out in the same manner as the aforementioned yttrium oxide and silicon dioxide.

  In the fluorescent lamp of the present invention, by adding an antioxidant to the metal alkoxide solution to form a mixed film, the oxidation of mercury can be prevented and the generation of mercury oxide in the fluorescent lamp can be suppressed. .

  In addition, the fluorescent lamp of the present invention adds phosphorus or boron as an impurity to the metal alkoxide solution to form a mixed film, thereby prohibiting the movement of sodium from the glass bulb and ensuring the reaction between sodium and mercury. Can be suppressed.

  In addition, the same effect as described above can be obtained by adding an antioxidant and phosphorus or a button using a metal nitrate, metal sulfate, metal carboxylate, or metal β-diketonate complex instead of the metal alkoxide solution. Has an effect.

  Further, the technology 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.

Side surface sectional drawing which fractured | ruptured and showed a part of fluorescent lamp which is one Example of this invention, and the enlarged view which expanded and showed the part Sectional drawing which expanded and showed the mixed film etc. in the fluorescent lamp of this invention Diagram showing light transmittance of silicon dioxide film The figure which shows the light transmittance of an aluminum oxide film Diagram showing light transmittance of hafnium oxide film The figure which shows the light transmittance of a zirconium oxide film Diagram showing light transmittance of vanadium oxide film Diagram showing light transmittance of niobium oxide film Diagram showing light transmittance of yttrium oxide film The conceptual diagram which fractured | ruptured and showed a part of fluorescent lamp of this invention The figure which shows the relationship between the depth and the diffusion amount of mercury in the yttrium oxide film, the aluminum oxide film, etc. The figure which shows the relationship between the luminous flux maintenance factor and lighting time of the fluorescent lamp of this invention and the conventional fluorescent lamp The figure which shows the relationship between the consumption of mercury and lighting time in the fluorescent lamp of this invention and the conventional fluorescent lamp The flowchart for demonstrating the manufacturing method of the fluorescent lamp of this invention The figure which shows the diffusion amount of mercury in the conventional fluorescent lamp (40W)

Explanation of symbols

2 Glass bulb 3 Mixed film 4 1st thin film 5 2nd thin film 6 Connection body 7 Phosphor particle

Claims (2)

A mixed film of a phosphor and a metal oxide having a polymer structure is formed on the inner surface of a lamp vessel in which mercury is enclosed, and the mixed film is formed in a gap between particles of the phosphor. A connecting body of the objects, and the connecting body is connected in a state where the phosphor particles are continuously bridged with a gap between the phosphor particles, and further, the inner surface of the lamp vessel and the mixed film A fluorescent lamp characterized in that a first thin film of metal oxide is formed between the two. The metal oxide of the mixed film and the first thin film is made 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. The fluorescent lamp according to claim 1.

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