JP2008041324A - Phosphor coating liquid and manufacturing method of fluorescent lamp using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of coating uneavenness of a phosphor coating liquid. <P>SOLUTION: The phosphor coating liquid contains phosphor, acrylic resin precursor, and a photo-polymerization initiator, in which the content of the acrylic resin precursor is preferably not less than 1 wt.% and not more than 10 wt.% of the total weight of the phosphor coating liquid. Moreover, a manufacturing method of a fluorescent lamp includes a process of preparing the phosphor coating liquid 12, a process of coating the phosphor coating liquid 13 on the inner peripheral face of a straight glass tube 11 in a hanging-down posture, and a process of irradiating ultra-violet rays to the glass tube 11, wherein by irradiation of the ultra-violet rays, the acrylic resin precursor is polymerized to form the acrylic resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a phosphor coating solution applied to the inner peripheral surface of a straight tubular translucent bulb, and a method of manufacturing a fluorescent lamp using the phosphor coating solution.

  As a fluorescent lamp, a straight tube fluorescent lamp constructed by applying a phosphor to the inner peripheral surface of a straight tubular glass tube, or a circular curve formed after applying a phosphor to the inner peripheral surface of a straight tube glass tube Ring fluorescent lamps and the like. As a method of applying phosphors in these fluorescent lamps, a phosphor coating solution containing a predetermined phosphor is poured from the upper end of a straight tubular glass tube in a hanging position, or a straight tubular glass tube in a hanging position. A method of sucking up a phosphor coating solution from the lower end of the substrate is known (for example, see Patent Document 1).

  On the other hand, cold cathode fluorescent lamps are used as backlight sources for liquid crystal displays and the like. In this cold cathode fluorescent lamp, since the inner diameter of the glass tube is as thin as about 1 to 7 mm, the method of pouring the phosphor coating solution from the upper end of the glass tube is poor in productivity, and the method of sucking up the phosphor coating solution is adopted. ing.

  FIG. 2 is a schematic view showing a conventional phosphor coating method in a glass tube for a cold cathode fluorescent lamp. The phosphor is applied to the inner peripheral surface of the glass tube 21 by first sucking up the phosphor coating solution 22 into the glass tube 21 by vacuum suction (FIG. 2A), and then bringing the glass tube 21 into the atmosphere. The phosphor coating liquid 22 is discharged after being opened (FIG. 2B), and the phosphor coating liquid 22 is discharged and dried by blowing dry air 23 from the upper end of the glass tube 21 at a predetermined flow rate. (FIG. 2C). In FIG. 2C, reference numeral 24 denotes a dried portion of the phosphor coating solution.

  Thereafter, the glass tube is heated at 500 ° C. to 600 ° C. to thermally decompose and remove the thickener contained in the phosphor coating solution, and the phosphor film is baked and fixed to the glass tube. Subsequently, an electrode is fused to the tube end of the glass tube, the inside of the glass tube is evacuated, and then mercury and a rare gas are enclosed in the glass tube to produce a cold cathode fluorescent lamp.

There is Patent Document 2 as a prior art related to the present invention.
JP-A-4-280031 JP-A-2005-174751

  The phosphor coating solution applied to the glass tube for the fluorescent lamp contains a thickener in order to adjust the viscosity of the coating solution and improve the adhesion to the glass surface. This thickener is decomposed and removed in a heating step in which the above-described phosphor film is baked on a glass tube. Conventionally, quasi-natural materials such as ethyl cellulose having a decomposition temperature of about 400 ° C. and nitrocellulose having a decomposition temperature of about 210 ° C. have been used as the thickener. In particular, in the case of a glass tube for a cold cathode fluorescent lamp having a small inner diameter, nitrocellulose having a low decomposition temperature has been mainly used in order to facilitate the decomposition and removal of the thickener.

  However, since nitrocellulose is a quasi-natural material as described above, it is difficult to make the molecular weight constant, and thus it may be difficult to make the viscosity of the phosphor coating solution constant. Moreover, when the molecular weight of nitrocellulose increases, nitrocellulose becomes difficult to dissolve in the solvent of the phosphor coating solution, and insoluble matter may be generated. On the other hand, a method of selecting nitrocellulose and keeping the molecular weight constant has also been implemented, but even this method cannot completely remove nitrocellulose having a large molecular weight.

  On the other hand, when the phosphor coating solution is applied to the glass tube in a state where the viscosity of the phosphor coating solution is not constant or the thickener is not completely dissolved in the solvent, uneven application of the phosphor coating solution is likely to occur. When this unevenness of application occurs, there is a problem that the brightness of the fluorescent lamp is lowered and a predetermined brightness cannot be secured. FIG. 3 is a diagram showing a general relationship between the thickness of the fluorescent film and the lamp luminance. As shown in FIG. 3, when the thickness of the fluorescent film is increased or decreased from the design value due to uneven coating, the lamp brightness is surely lowered. Therefore, unless the thickness of the fluorescent film in the longitudinal direction of the fluorescent lamp is made uniform, the luminance in the longitudinal direction of the fluorescent lamp cannot be made uniform.

  The present invention solves the above-mentioned conventional problems, and provides a phosphor coating solution that does not use a quasi-natural material such as nitrocellulose, and a method of manufacturing a fluorescent lamp using the phosphor coating solution.

  The phosphor coating liquid of the present invention is a phosphor coating liquid containing a phosphor, an acrylic resin precursor, and a photopolymerization initiator, and the acrylic resin precursor is composed of an acrylic resin monomer and an acrylic resin oligomer. It contains at least one selected from the group.

  The method for producing a fluorescent lamp of the present invention comprises the steps of preparing the phosphor coating solution of the present invention and applying the phosphor coating solution to the inner peripheral surface of a straight tubular translucent bulb in a suspended position. And a step of irradiating the translucent bulb with ultraviolet rays.

  Since the phosphor coating liquid of the present invention does not contain a quasi-natural material such as nitrocellulose, it is possible to suppress the occurrence of coating unevenness and provide a fluorescent lamp with high brightness.

  In addition, since the fluorescent lamp manufacturing method of the present invention uses the phosphor coating liquid of the present invention, the thickness of the fluorescent film of the translucent bulb can be made constant, and a fluorescent lamp with high brightness can be obtained. Can be provided.

  Embodiments of the present invention will be described below.

(Embodiment 1)
First, an embodiment of the phosphor coating solution of the present invention will be described. The phosphor coating liquid of the present invention contains a phosphor, an acrylic resin precursor, and a photopolymerization initiator. Moreover, the said acrylic resin precursor contains at least 1 sort (s) chosen from the group which consists of an acrylic resin monomer and an acrylic resin oligomer.

  Since the phosphor coating liquid of the present invention does not contain a quasi-natural material such as nitrocellulose, insoluble matters are not generated, and the occurrence of uneven coating can be suppressed. Moreover, since the phosphor coating liquid of the present invention contains an acrylic resin precursor and a photopolymerization initiator, the phosphor coating film is applied to the surface to be coated with a predetermined thickness by irradiating ultraviolet rays after coating. Can stick. This point will be described in detail in the second embodiment.

  The phosphor coating solution is prepared by dissolving a phosphor, an acrylic resin precursor, and a photopolymerization initiator in a solvent. As the solvent, for example, butyl acetate, butanol, isopropyl alcohol, water and the like can be used.

  The content of the acrylic resin precursor is preferably 1% by weight to 10% by weight with respect to the total weight of the phosphor coating solution. If it is less than 1% by weight, it is difficult to suppress the occurrence of coating unevenness, and if it exceeds 10% by weight, the ratio of the phosphor decreases, and the luminance may decrease.

  The acrylic resin precursor may further contain another monomer or oligomer as long as it contains at least one selected from an acrylic resin monomer and an acrylic resin oligomer capable of forming an acrylic resin by polymerization. .

  The acrylic resin monomer may be at least one selected from the group consisting of acrylic acid, methacrylic acid, acrylic ester and methacrylic ester.

  The acrylic resin oligomer may be an oligomer obtained by polymerizing at least one acrylic resin monomer selected from the group consisting of acrylic acid, methacrylic acid, acrylic acid ester, and methacrylic acid ester. The degree of polymerization of the acrylic resin oligomer is preferably several tens or less in order to maintain a liquid state.

  The acrylic resin precursor preferably contains a metal element. The acrylic resin precursor is polymerized by irradiation with ultraviolet rays, and then decomposed and removed in a heating process in which the aforementioned phosphor film is baked onto, for example, a glass tube. At that time, the metal element is oxidized to form a phosphor as a metal oxide. This is because the metal oxide functions as a protective film of the phosphor. That is, adsorption of mercury encapsulated in the fluorescent lamp to the phosphor can be suppressed by the metal oxide.

The metal element can be at least one selected from the group consisting of Y, La, Hf, Mg, Si, Al, P, B, V, and Zr, and among these, Y is particularly preferable. This is because Y ₂ O ₃ , which is an oxide of Y, has a particularly large ability to suppress the adsorption of mercury to the phosphor.

  Moreover, it is preferable that the hydrogen element of the OH group contained in the acrylic resin precursor is substituted with the metal element. Thereby, a protective film of a metal oxide can be formed on the surface of the phosphor, and the decomposition temperature of the acrylic resin formed by polymerization can be lowered.

  The phosphor coating solution may contain a metal compound. This metal compound also becomes a metal oxide by the heating process in the same manner as the above metal element, and this metal oxide functions as a protective film for the phosphor.

The metal compounds, for example, yttrium carboxylate _{(Y (C n H n +} 1 COO) 3, n = 5~8), yttrium isopropoxide _{(Y (OC 3 H 7)} 3), tetraethoxysilane ( Organic metal compounds such as Si (OC ₂ H ₅ ) ₄ ), metal nitrates, metal sulfates, metal carboxylates, metal β-diketonate complexes, and the like can be used. Moreover, as a specific example of the said yttrium carboxylate, yttrium caprylate, yttrium octylate, etc. can be used, for example.

  Examples of the phosphor include europium activated yttrium oxide phosphor, cerium terbium activated lanthanum phosphate phosphor, europium activated strontium halophosphate phosphor, europium activated barium magnesium aluminate phosphor, europium manganese activated barium magnesium aluminum One or more phosphors such as nate phosphor, terbium activated cerium aluminate phosphor, terbium activated cerium magnesium aluminate phosphor, antimony activated calcium halophosphate phosphor, europium activated yttrium vanadium oxide phosphor Can be mixed and used. In particular, it is preferable to use a mixture of three or more phosphors that emit light corresponding to each wavelength region of red, blue, and green because a white fluorescent lamp with high demand can be provided. The phosphor content may be 20 wt% or more and 70 wt% or less with respect to the total weight of the phosphor coating solution.

  The photopolymerization initiator is not particularly limited. For example, benzoin, benzoin methyl ether, benzoyl isopropyl ether, benzoin isobutyl ether, benzoin butyl ether, 2,2-dihydroxy-2-phenylacetophenone, 2,2-dimethoxy-2-phenyl Acetophenone, 2,2-diethoxy-2-phenylacetophenone, 1-hydroxy-cyclohexyl-phenyl-ketone and the like can be used. Content of a photoinitiator should just be 0.1 to 10 weight% with respect to the total weight of an acrylic resin precursor. If the content of the photopolymerization initiator is less than 0.1% by weight, the film strength is lowered due to poor curing, which is not preferable because it remains as an impurity when the phosphor coating solution is more than 10% by weight.

(Embodiment 2)
Next, an embodiment of the fluorescent lamp manufacturing method of the present invention will be described. The fluorescent lamp manufacturing method of the present invention includes a step of preparing the phosphor coating solution of Embodiment 1, a step of applying the phosphor coating solution to the inner peripheral surface of a straight tubular translucent bulb in a suspended position, and Irradiating the translucent bulb with ultraviolet rays.

  Since the phosphor coating liquid contains an acrylic resin precursor and a photopolymerization initiator, the phosphor coating film is formed with a predetermined thickness on the inner peripheral surface of the light-transmitting bulb by irradiating ultraviolet rays after coating. Can be fixed to. That is, by irradiating ultraviolet rays after coating, the acrylic resin precursor is polymerized to form an acrylic resin, and the phosphor coating solution can be fixed to the inner peripheral surface of the translucent bulb. Since the adhesion force to the translucent bulb can be increased, the thickness of the phosphor coating film can be made constant. That is, the viscosity of the phosphor coating liquid applied to the light-transmitting bulb increases, and the flow of the phosphor coating liquid can be suppressed more than necessary, and the thickness of the phosphor coating film to be formed can be made closer to the design value. it can.

  Further, in the method for producing a fluorescent lamp of the present invention, the phosphor coating solution is applied and then irradiated with ultraviolet rays, and a heating step is not necessarily required. Therefore, as a solvent for the phosphor coating solution, for example, flammable acetic acid is used. Even if butyl or the like is used, there is no risk of combustion and the safety of the manufacturing process can be ensured. In addition, by using ultraviolet rays, the polymerization time can be shortened as compared with polymerization by heating, and furthermore, the degree of polymerization can be freely controlled by controlling the irradiation amount of ultraviolet rays.

  In the step of preparing the phosphor coating solution, as described in Embodiment 1, the phosphor, the acrylic resin precursor, and the photopolymerization initiator are dissolved in a solvent to obtain a phosphor coating solution.

  Next, in the step of applying the phosphor coating solution to the inner peripheral surface of the straight tubular translucent bulb in the hanging position, for example, the phosphor coating solution is poured from the upper end of the translucent bulb, and unnecessary phosphors are used. A casting method in which the coating solution is allowed to flow down naturally, or a suction method in which the phosphor coating solution is sucked into the tube of the light-transmitting bulb and then allowed to flow down, can be employed. However, in the case of a thin tube having an inner diameter of the light-transmitting bulb of about 1 to 7 mm, the above suction method is preferable because the above-described pouring method has poor productivity. For example, a glass tube can be used as the light-transmitting bulb.

  Next, in the step of irradiating the translucent bulb with ultraviolet rays, the ultraviolet rays may be irradiated using an ultraviolet lamp or the like. Although the irradiation amount of an ultraviolet-ray changes with kinds of an acrylic resin precursor and a photoinitiator, it should just be 50W-400W, for example.

  The decomposition temperature of the acrylic resin formed by polymerization is preferably 200 ° C. or higher and 400 ° C. or lower, and more preferably 200 ° C. or higher and 250 ° C. or lower. It is difficult to form an acrylic resin having a decomposition temperature of less than 200 ° C., and when it exceeds 400 ° C., it becomes difficult to decompose and remove the acrylic resin. This is because the acrylic resin may not be completely decomposed or removed in some cases.

  With a predetermined position from the upper end of the translucent bulb as a reference point, the irradiation amount of the ultraviolet ray on the translucent bulb located above the reference point is A, and the ultraviolet ray on the translucent bulb located below the reference point When the dose of B is B, it is preferable that A <B. Thereby, the thickness of the phosphor coating film above and below the reference point of the translucent bulb can be made more uniform. The reference point is usually set at the center in the longitudinal direction of the light transmissive bulb, but may be set at a position 1/3, 2/3 from the upper end of the light transmissive bulb, or the like. In particular, when the length of the translucent bulb is about 700 to 1000 mm, the thickness of the phosphor coating film at the lower portion of the translucent bulb tends to be thinner than that at the upper portion. The amount of UV irradiation to the translucent bulb located below the reference point is set to the central portion in the longitudinal direction of the directional bulb, and the amount of UV irradiation to the translucent bulb located above the reference point If it is increased, the thickness of the phosphor coating film can be made uniform over the entire length of the translucent bulb.

The fluorescent lamp manufacturing method of the present invention may include a step of blowing a gas into the light-transmitting bulb and drying the phosphor coating liquid. Thereby, the drying time of a fluorescent substance coating liquid can be shortened. As the gas, room temperature air, heating air, room temperature drying air, heating drying air and the like can be used. The gas flow rate (cm ³ ) is 5 cm ³ during leveling for stably forming the phosphor coating film per unit cross-sectional area (mm ² ) and unit time (min) of the cross section perpendicular to the central axis of the translucent bulb. it is desirable to ^{/ min / mm 2 ~20cm 3 /} min / mm 2 in the range may be the range of ^{60cm 3 / min / mm 2 ~100cm} 3 / min / mm 2 when dry. In the present invention, since the phosphor coating film is firmly adhered to the light-transmitting bulb by the acrylic resin, the phosphor coating film is not peeled off even when air is blown strongly.

  The fluorescent lamp manufacturing method of the present invention may include a step of drying the phosphor coating liquid by heating the translucent bulb. This also shortens the drying time of the phosphor coating solution. The drying temperature may be 30 ° C to 65 ° C.

When the drying process of the phosphor coating film is completed, the translucent bulb is heated at 500 ° C. to 600 ° C. to thermally decompose and remove the acrylic resin contained in the phosphor coating film, and to transmit the phosphor film. Baked and fixed to the sex valve. At this time, when the acrylic resin precursor used in the phosphor coating solution contains a metal element such as Y, or when the phosphor coating solution contains a metal compound such as yttrium carboxylate, A metal oxide such as Y ₂ O ₃ is formed on the surface of the phosphor, and functions as a protective film for the phosphor.

  Finally, electrodes are fused to both ends of the translucent bulb, the inside of the translucent bulb is evacuated, and then mercury and a rare gas are enclosed to produce a fluorescent lamp.

  Next, a method for manufacturing a fluorescent lamp according to the present invention will be described with reference to the drawings. Below, the example which used the glass tube as a translucent valve | bulb is demonstrated. FIG. 1 is a schematic diagram showing an example of the manufacturing process of the fluorescent lamp of the present invention. First, as shown in FIGS. 1A and 1B, the phosphor coating liquid 12 is sucked up to a predetermined position by vacuum suction into a straight tubular glass tube 11 in a suspended position. Next, as shown in FIG. 1C, the inside of the glass tube 11 is opened to the atmosphere so that the phosphor coating solution 12 is allowed to flow naturally, and the phosphor coating solution 13 is applied to the inner peripheral surface of the glass tube 11.

  Next, as shown in FIG. 1D, ultraviolet rays are irradiated from the outside using an ultraviolet lamp 14 while rotating the glass tube 11 with the central axis of the glass tube 11 as the rotation axis. By rotating the glass tube 11, the entire phosphor coating solution 13 applied to the inner peripheral surface of the glass tube 11 can be more uniformly irradiated with ultraviolet rays, and the phosphor coating solution 13 can be used even when the glass tube 11 is inclined. Can be prevented. The rotation speed of the glass tube 11 is preferably 70 rpm or less. If it is within this range, even if there is some warp in the glass tube 11, vibration does not occur, and unevenness of the phosphor coating liquid 13 can be prevented. By this step, the acrylic resin precursor in the phosphor coating solution 13 is polymerized, the viscosity of the phosphor coating solution 13 is increased, the natural flow of the phosphor coating solution 13 is suppressed, and a constant coating thickness is maintained. Can do. 1D shows a state after the phosphor coating liquid 12 has completely flowed down naturally from the inside of the glass tube 11, but a state in which a part of the phosphor coating liquid 12 remains at the bottom in the glass tube 11. You may irradiate with ultraviolet rays.

  Next, as shown in FIG. 1E, the glass tube 11 is heated from the outside by the heater 16 at the same time as the dry air 15 at room temperature is blown into the inside from the upper end while rotating the glass tube 11. As a result, the phosphor coating solution is dried, and the phosphor coating film 17 is formed on the inner peripheral surface of the glass tube 11. As the heater 16, an infrared heater is preferable. This is because the glass tube 11 has the property of absorbing infrared rays, so that the infrared rays emitted from the infrared lamp are absorbed by the glass tube 11 and the absorbed infrared rays can rapidly heat the glass tube 11.

  The length of the glass tube 11 can be set to 700 to 1500 mm. As a result, it is possible to meet the market demand for longer fluorescent lamps. Moreover, the internal diameter of the glass tube 11 can be made into the range of 1-7 mm. Thereby, it can respond to manufacture of the cold cathode fluorescent lamp used as backlight light sources, such as a liquid crystal display.

Moreover, the glass tube 11 can be formed from borosilicate glass. The glass tube 11 is not limited to borosilicate glass, and may be formed using lead glass, lead-free glass, soda glass, or the like. Thereby, dark startability can be improved. That is, the glass as described above contains many alkali metal oxides typified by sodium oxide (Na ₂ O). For example, in the case of sodium oxide, the sodium (Na) component is the inner surface of the glass tube over time. To elute. This is because sodium has a low electronegativity, and sodium eluted at the inner end of the glass tube on which no protective film is formed seems to contribute to the improvement of the dark startability.

  In particular, in an external electrode fluorescent lamp formed so as to cover the outer electrode on the outer peripheral surface of the end portion of the glass tube, the content of the alkali metal oxide in the material of the glass tube is preferably 3 mol% or more and 20 mol% or less.

  For example, when the alkali metal oxide is sodium oxide, the content is preferably 5 mol% or more and 20 mol% or less. If it is less than 5 mol%, the probability that the dark start time will exceed 1 second increases (in other words, if it is 5 mol% or more, the probability that the dark start time will be within 1 second increases), and if it exceeds 20 mol%, the probability increases. This is because the use of time causes whitening of the glass tube, resulting in a decrease in luminance, and a decrease in strength of the glass tube.

  In consideration of protection of the natural environment, it is preferable to use lead-free glass. In addition, although lead-free glass may contain lead as an impurity in the manufacturing process, glass containing lead at an impurity level of 0.1% by weight or less can be handled as lead-free glass.

  As described above, the present invention provides a phosphor coating solution capable of preventing the occurrence of uneven coating and a fluorescent lamp using the same (internal electrode type cold cathode fluorescent lamp, external electrode type cold cathode fluorescent lamp, hot cathode fluorescent lamp, etc.) Can be provided, and its industrial value is great.

It is a schematic diagram which shows an example of the manufacturing process of the fluorescent lamp of this invention. It is a schematic diagram which shows the conventional fluorescent substance application | coating method in the glass tube for cold cathode fluorescent lamps. It is a figure which shows the general relationship between the thickness of a fluorescent film, and lamp | ramp brightness | luminance.

Explanation of symbols

11, 21 Glass tube 12, 13, 22 Phosphor coating solution 14 Ultraviolet lamp 15, 23 Dry air 16 Heater 17 Phosphor coating film

Claims (16)

A phosphor coating liquid containing a phosphor, an acrylic resin precursor, and a photopolymerization initiator,
The phosphor coating liquid, wherein the acrylic resin precursor contains at least one selected from the group consisting of an acrylic resin monomer and an acrylic resin oligomer.   2. The phosphor coating solution according to claim 1, wherein the content of the acrylic resin precursor is 1 wt% or more and 10 wt% or less with respect to the total weight of the phosphor coating solution.   The phosphor coating liquid according to claim 1, wherein the acrylic resin monomer is at least one selected from the group consisting of acrylic acid, methacrylic acid, acrylic acid ester, and methacrylic acid ester.   The phosphor coating liquid according to claim 1, wherein the acrylic resin oligomer is obtained by polymerizing at least one acrylic resin monomer selected from the group consisting of acrylic acid, methacrylic acid, acrylic ester, and methacrylic ester.   The phosphor coating liquid according to claim 1, wherein the acrylic resin precursor contains a metal element.   The phosphor coating liquid according to claim 5, wherein the metal element is at least one selected from the group consisting of Y, La, Hf, Mg, Si, Al, P, B, V, and Zr.   The phosphor coating liquid according to claim 6, wherein a hydrogen element of an OH group contained in the acrylic resin precursor is substituted with the metal element.   The phosphor coating liquid according to claim 1, wherein the phosphor coating liquid further contains a metal compound.   The phosphor coating liquid according to claim 8, wherein the metal compound is an organometallic compound.   The phosphor coating liquid according to claim 9, wherein the organometallic compound is yttrium carboxylate. Preparing the phosphor coating liquid according to any one of claims 1 to 10,
Applying the phosphor coating liquid to the inner peripheral surface of a straight tubular translucent bulb in a hanging position;
And a step of irradiating the light-transmitting bulb with ultraviolet rays.   The method for producing a fluorescent lamp according to claim 11, wherein the acrylic resin precursor is polymerized to form an acrylic resin by irradiating the ultraviolet rays.   The method for manufacturing a fluorescent lamp according to claim 12, wherein a decomposition temperature of the acrylic resin is 200 ° C. or more and 400 ° C. or less.   With a predetermined position from the upper end of the translucent bulb as a reference point, the irradiation amount of the ultraviolet light with respect to the translucent bulb located above the reference point is A, and the translucency located below the reference point is A. The method of manufacturing a fluorescent lamp according to claim 11 or 12, wherein A <B, where B is an irradiation amount of the ultraviolet light to the light bulb.   The manufacturing method of the fluorescent lamp of any one of Claims 11-14 which further includes the process of blowing gas in the said translucent bulb | bulb and drying the said fluorescent substance coating liquid.   The method for manufacturing a fluorescent lamp according to any one of claims 11 to 15, further comprising a step of heating the translucent bulb to dry the phosphor coating liquid.

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