JP2009129824A - Coating for fluorescent lamp and coating film using the same, method of manufacturing coating film, and fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating for a fluorescent lamp, for forming a near infrared shielding coating film capable of shielding near infrared rays, which are a cause of malfunction, generated from a fluorescent lamp, thereby capable of preventing occurrence of malfunction of electronic devices such as liquid crystal display devices owing to the near infrared rays, without possibility of increasing electric power consumption and production cost regardless of the position, the shape and the size of the electronic device; and to provide a coating film prepared using the same, a method of manufacturing the coating film and a fluorescent lamp. <P>SOLUTION: The coating for a fluorescent lamp contains a near infrared shielding material and a solvent, the near infrared shielding material contains a tungsten oxide and/or a composite tungsten oxide, and the solvent contains a low boiling point organic solvent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating material for a fluorescent lamp, a coating film using the same, a method for producing the coating film, and a fluorescent lamp, and more particularly, a wavelength band of 800 nm to 1000 nm generated from a phosphor layer formed inside the fluorescent lamp. By shielding near infrared rays, it is possible to prevent malfunctions of electronic devices such as liquid crystal display devices caused by the near infrared rays, and there is no risk of increasing power consumption or manufacturing costs. Fluorescent lamp paint for forming infrared shielding coating film, coating film using this fluorescent lamp paint, coating film manufacturing method, and prevention of malfunction of electronic equipment due to near infrared rays It relates to a possible fluorescent lamp.

Conventionally, as a liquid crystal display device (LCD) used for OA equipment such as a personal computer (PC) and a word processor (WP), a remote control type liquid crystal that operates the entire device from the outside by using a remote control device (remote control). There is a display device.
The liquid crystal display device includes a liquid crystal panel, a backlight unit, a video signal processing unit, a system control unit, a remote control signal light receiving unit, and a remote control, and a cold cathode fluorescent lamp is attached to the backlight unit. .
In this fluorescent lamp, for example, a light emitting layer made of a phosphor is formed on the inner surface of a light-transmitting sealing tube in which both ends of a glass tube are sealed, and electrodes are respectively provided on both end sides in the light-transmitting sealing tube. An electron radioactive substance such as cesium oxide is attached to any part of the translucent sealing tube, for example, an electrode, and further, mercury and a rare gas such as argon or neon are introduced into the translucent sealing tube. When the discharge is generated between the electrodes by the inverter, the discharge excites mercury to generate ultraviolet rays, and the ultraviolet rays hit the phosphors in the light emitting layer to emit light.
In this liquid crystal display device, a user operates the entire liquid crystal display device using a remote controller from the outside.

In this liquid crystal display device, the fluorescent lamp of the backlight unit is turned on upon activation. When the temperature of the fluorescent lamp is low, excitation of neon and argon is the center, and infrared rays are emitted.
In the past, this amount of infrared radiation was small, so it was not particularly problematic, but in recent years, with the increase in the size of liquid crystal display devices, the influence of infrared rays generated by the above causes from the fluorescent lamp of the backlight unit has been ignored. You can't do that. In particular, when the liquid crystal display device is activated, there is a possibility that near infrared rays generated due to the above-described causes may enter the light receiving portion of the remote controller and cause the remote controller to malfunction.

Therefore, in order to limit the lower viewing angle of the light receiving part of the remote control signal, an infrared ray generated from the backlight by providing a light shielding part for blocking reflected light on the light receiving window side or operating the backlight lighting sequence There has been proposed a liquid crystal display device that avoids malfunction of the remote controller by reducing the amount (Patent Document 1).
Further, in order to shield near infrared rays from fluorescent lamps, a near infrared shielding film (film) in which a resin film is coated with an insulating / protective layer for controlling the infrared transmittance to 30% or less on at least a strip-shaped light projection portion of the arc tube. ) Has been proposed (Patent Document 2).
JP 2004-274389 A JP 2003-303574 A

  By the way, in the conventional liquid crystal display device in which the lower viewing angle of the light receiving unit is limited, there is a problem that the viewing angle may not be controlled depending on the position of the liquid crystal panel, the usage method, the size, and the like. Also, when operating the backlight lighting sequence, the screen of the liquid crystal panel becomes larger and the length of the fluorescent lamp becomes longer. Therefore, it is necessary to increase the heat capacity of the backlight itself, which increases power consumption. There was a problem that.

On the other hand, a fluorescent lamp equipped with a near-infrared shielding film (film) has a problem that the target fluorescent lamp is limited to an external electrode type xenon fluorescent lamp for an electronic copying machine or a facsimile. This near-infrared shielding film is used to eliminate the fact that near-infrared rays generated from an external electrode type xenon fluorescent lamp induce a malfunction when reading an image in a CCD solid-state imaging device and make it difficult to read a clear image. It was not intended to eliminate the malfunction of the remote control caused by the near infrared rays generated when the fluorescent lamp was started from a low temperature.
Furthermore, since the near-infrared shielding film is attached to the strip light projection part of the arc tube, it is necessary to attach the near-infrared shielding film after producing the fluorescent lamp, which complicates the manufacturing process and increases the manufacturing cost. There was a problem of doing. Further, with this structure, the durability required for the liquid crystal display device cannot be expected.

  The present invention has been made to solve the above-described problem, and can block near infrared rays generated from a fluorescent lamp which is a cause of malfunction, and thus a liquid crystal display device caused by the near infrared rays. Near-infrared shielding that can prevent malfunction of electronic equipment such as, and that does not affect the position, shape, and size of the electronic equipment, and that may cause an increase in power consumption or an increase in manufacturing costs. An object of the present invention is to provide a fluorescent lamp paint for forming a coating film, a coating film using the same, a method for producing the coating film, and a fluorescent lamp.

  As a result of intensive studies in order to solve the above-mentioned problems, the present inventor has developed a fluorescent lamp paint containing a near-infrared shielding material containing tungsten oxide and / or composite tungsten oxide and a solvent. If a coating film is formed on the inner surface of the translucent sealing tube, near infrared rays can be shielded, and thus malfunction of electronic equipment such as a liquid crystal display device due to the near infrared rays can be prevented. In addition, the present inventors have found that there is no possibility of causing an increase in power consumption and an increase in manufacturing cost without being affected by the position, shape, and size of the electronic device.

  That is, the fluorescent lamp paint according to the present invention is characterized by containing a near-infrared shielding substance and a solvent.

It is preferable that the near-infrared shielding material contains tungsten oxide and / or composite tungsten oxide.
The solvent preferably includes a low boiling point organic solvent.
Further, it preferably contains a protective film forming substance.

The coating film of the present invention is formed using the fluorescent lamp paint of the present invention.
The method for producing a coating film of the present invention is characterized in that a coating film is formed by applying the fluorescent lamp coating composition of the present invention on a substrate, and then the coating film is dried or dried and heat-treated.

The fluorescent lamp of the present invention is characterized in that the coating film of the present invention is formed inside a translucent sealing tube.
The near-infrared shielding material contains tungsten oxide and / or composite tungsten oxide, and the area of the coating film per 1 g of the tungsten oxide and / or composite tungsten oxide is 2.0 m ² or more and 7 It is preferably 0.0 m ² or less.

  According to the fluorescent lamp paint of the present invention, since it contains a near-infrared shielding substance and a solvent, the coating film obtained by applying this fluorescent lamp paint can effectively shield near-infrared rays. Thus, it is possible to form a coating film capable of shielding near infrared rays generated from a fluorescent lamp which is a cause of malfunction.

According to the coating film of the present invention, since it is formed using the fluorescent lamp paint of the present invention, it is possible to shield near infrared rays generated from the fluorescent lamp, and for electronic devices such as liquid crystal display devices caused by the near infrared rays. Malfunctions can be prevented.
Therefore, it is possible to prevent malfunction of electronic equipment such as a liquid crystal display device due to near infrared rays, and without increasing the position, shape and size of the electronic equipment, the increase in power consumption and the production cost. There is no risk of rising.

  According to the method for producing a coating film of the present invention, a coating film is formed by applying the fluorescent lamp coating composition of the present invention on a substrate, and then the coating film is dried or dried / heat treated. Thus, a coating film that can prevent malfunction of electronic equipment such as a liquid crystal display device caused by near infrared rays can be easily formed without increasing the manufacturing cost.

  According to the fluorescent lamp of the present invention, since the coating film of the present invention is formed inside the translucent sealing tube, the coating film formed inside the translucent sealing tube shields near infrared rays. The near infrared rays can be prevented from leaking to the outside of the translucent sealing tube, and malfunction of electronic equipment such as a liquid crystal display device due to the near infrared rays can be prevented.

The fluorescent lamp paint of the present invention, a coating film using the same, a method for producing the coating film, and the best mode for carrying out the fluorescent lamp will be described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

"Fluorescent lamp paint"
The fluorescent lamp paint of the present invention is a paint containing a near-infrared shielding substance and a solvent, and is a paint for forming a near-infrared shielding film.
Here, the near-infrared shielding substance is a substance having a property of shielding near-infrared rays generated from a fluorescent lamp in a wavelength band of 800 nm to 1000 nm.
This near-infrared shielding substance is preferably fine particles having an average particle size of 20 μm or more and 200 μm or less, preferably 50 μm or more and 100 μm or less.

As this near-infrared shielding substance, tungsten oxide and / or composite tungsten oxide is preferable.
Tungsten oxide is an oxide represented by a general formula W _y O _z (where 2.2 ≦ z / y ≦ 2.999), and W ₂ O ₅ , W ₃ O ₈ , W ₄ O _11. , W ₅ O ₁₄ , W ₁₈ O _{49, and the} like. In particular, W ₁₈ O ₄₉ is preferable because it has excellent properties of shielding near infrared rays.

The composite tungsten oxide has a general formula M _x W _y O _z (where M is an alkali metal (Li, Na, K, Rb, Cs, Fr), alkaline earth metal (Ca, Sr, Ba, Ra), rare earth Element (Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), Mg, Zr, Cr, Mn, Fe, Ru, Co , Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br , Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, one or more elements, 0.001 ≦ x / y ≦ 1, 2 .2 ≦ z / y ≦ 3.0).

  This near-infrared shielding material includes transparent conductive materials such as tin-added indium oxide (ITO), antimony-added tin oxide (ATO), zinc-added indium oxide (IZO), aluminum-added zinc oxide (AZO), and gallium-added zinc oxide. You may mix 1 type, or 2 or more types selected from the group of (GZO).

As a solvent used for this coating material, a low boiling point organic solvent having a boiling point of 150 ° C. or less under normal pressure (1 atm) is preferable, and water may be contained.
Examples of the low-boiling organic solvent include lower alcohols such as methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol, methyl acetate, ethyl acetate, propyl acetate, 1-butyl acetate, and acetate-2- Esters such as butyl, ethers such as diethyl ether, ethylene glycol monomethyl ether (methyl cellosolve), ethylene glycol monoethyl ether (ethyl cellosolve), ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and acetyl acetone, toluene, xylene, etc. 1 type, or 2 or more types of aromatic hydrocarbons can be used.

  Among them, lower alcohols, ketones and the like can be mentioned, and methanol, ethanol, 1-propanol, 2-propanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ether, ethylene glycol monomethyl ether (methyl cellosolve) and the like are particularly preferable. is there.

In order to adjust the drying speed of the paint, a high boiling point organic solvent may be added.
This high-boiling organic solvent is an organic solvent having a boiling point exceeding 150 ° C. under normal pressure (1 atm). For example, N-methyl-2-pyrrolidinone, ethylene glycol, diethylene glycol, propylene glycol, ethylene glycol monobutyl ether ( Butyl cellosolve), formamide, N-methylformamide, N, N-dimethylformamide, N-methylacetamide, N, N-dimethylacetamide and the like.

In order to improve the dispersibility of the paint, it is preferable to add a dispersant to the paint.
Examples of the dispersant include water-soluble polymers such as polycarboxylates, polyalkyl sulfates, and polyvinyl alcohol (PVA).
The coating, in addition to the above, depending on the application or specification, metal oxides, silica, inorganic oxides such as LaB _6, surfactants, organic polymer such as a resin, low melting glass such as zinc borosilicate glass May be contained.
If this coating material contains a protective film forming substance such as silicon oxide, a coating film having both a near-infrared shielding function and a protective film function can be formed.

  Since this fluorescent lamp paint contains a near-infrared shielding material composed of tungsten oxide and / or composite tungsten oxide and a low-boiling organic solvent, the paint obtained by applying this fluorescent lamp paint. It is possible to form a coating film that can satisfactorily shield near infrared rays in the wavelength band of 800 nm to 1000 nm.

"Manufacturing method of coating film"
The method for producing a coating film of the present invention is a method in which the coating material is applied on a substrate to form a coating film, and then the coating film is dried or dried / heat treated.
As the base material, any base material that can withstand the heat treatment temperature may be used, and a glass base material, a light-transmitting ceramic base material, and the like are suitable. A tube is preferred.

At the time of application, it is necessary to adjust the application amount of the near-infrared shielding substance in the formed coating film. For example, when tungsten oxide and / or composite tungsten oxide is used as the near-infrared shielding substance, Coating is performed so that the area of the coating film per 1 g of tungsten oxide and / or composite tungsten oxide is 2.0 m ² or more and 7.0 m ² or less, preferably 3.0 m ² or more and 5.0 m ² or less. It is preferable to adjust the amount.
For example, in the case of a paint having a content of tungsten oxide and / or composite tungsten oxide of 5 to 20% by mass, the coating amount is preferably 2 μm to 8 μm, particularly 4 μm to 6 μm. It is preferable to use an amount.

  As a coating method, since it can be used with a flat backlight, a spin coating method, a roll coating method, a spray coating method, a bar coating method, a dip coating method, a meniscus coating method, a suction coating method, a flow coating method, etc. A coating method can be used. In particular, when a coating film is formed on the inner surface of a glass tube like a fluorescent lamp, a suction coating method, a flow coating method, or the like is preferably used.

Next, the coating film is dried or dried / heat treated in the air.
The drying temperature may be a temperature at which the low-boiling organic solvent (or the low-boiling organic solvent and the high-boiling organic solvent) contained in the paint is sufficiently dissipated, and is, for example, room temperature (25 ° C.) to 150 ° C.
In this drying step, the coating film only needs to be sufficiently dried, may be dried only by heating, or may be blown with air. Specifically, hot air may be blown by air blow at normal temperature.
The heat treatment is performed at a temperature in the range of 500 ° C. to 800 ° C. for a predetermined time within a range where no trouble occurs in the fluorescent lamp.
Further, this heat treatment step may be performed simultaneously with the phosphor layer when the phosphor layer and the coating film of the present invention are sequentially formed on the substrate.
In this way, the coating film of the present invention can be obtained.

  According to this method for producing a coating film, a coating film is formed by applying the coating material on a glass substrate, a translucent ceramic substrate, etc., and then the coating film is dried or dried / heat treated. Therefore, it is possible to easily form a coating film that can well shield near infrared rays in the wavelength band of 800 nm to 1000 nm.

Since the coating film thus obtained has a function as a near-infrared shielding film, it can shield near-infrared rays in a wavelength band of 800 nm to 1000 nm generated from a fluorescent lamp, and a liquid crystal display resulting from the near-infrared rays It is possible to prevent malfunction of electronic devices such as devices.
Therefore, it is possible to prevent malfunction of electronic equipment such as a liquid crystal display device due to near infrared rays, and without increasing the position, shape and size of the electronic equipment, the increase in power consumption and the production cost. There is no risk of rising.

"Fluorescent lamp"
The fluorescent lamp of the present invention can shield near infrared rays in the wavelength band of 800 nm to 1000 nm generated from the fluorescent lamp by forming the coating film of the present invention inside the translucent sealing tube.
FIG. 1 is a longitudinal sectional view showing a fluorescent lamp according to an embodiment of the present invention. FIG. 2 is a transverse sectional view of the fluorescent lamp. In the figure, 1 is a translucent sealing tube made of a glass tube sealed at both ends. 2 is a coating film of the present invention, a near-infrared shielding film formed on the entire inner wall (inner surface) of the translucent sealing tube 1, 3 is a red light emitting phosphor, a green light emitting phosphor and a blue light emitting fluorescent material A phosphor layer made of a body mixture, 4 is an electrode provided on each end of the translucent sealing tube 1, and 5 is a lead wire electrically connected to the electrode 4.

G is a sealed gas sealed in the translucent sealing tube 1, and this sealed gas G is composed of a rare gas such as mercury, neon, or argon, or an inert gas such as nitrogen.
The near-infrared shielding film 2 has a coating area per 1 g of tungsten oxide and / or composite tungsten oxide of 2.0 m ² or more and 7.0 m ² or less, preferably 3.0 m ² or more and 5.0 m. The thickness of the coating film is adjusted to be ² or less.

In this fluorescent lamp, when energized through a lighting electric circuit, the mercury in the translucent sealing tube 1 is excited, and this mercury emits light having a wavelength of 254 nm, which is an emission line. The phosphor layer 3 absorbs and excites the light having the wavelength of 254 nm and emits it through the bulb.
If the temperature of the fluorescent lamp at the time of this lighting is low, excitation of neon and argon becomes the center rather than excitation of mercury, so that more near infrared rays are emitted at the time of this excitation.
In this case, since the near-infrared shielding film 2 is formed on the entire inner wall of the translucent sealing tube 1, the emitted near-infrared light is shielded by the near-infrared shielding film 2 and leaks out of the fluorescent lamp. There is no fear.

In this fluorescent lamp, the near-infrared shielding film 2 is formed by applying the fluorescent lamp coating material of the present embodiment to the entire inner wall (inner surface) of the translucent sealing tube 1 and drying or drying / heating in the atmosphere. Next, a phosphor film-forming coating material is applied on the near infrared shielding film 2, dried and heat-treated to form the phosphor layer 3, and then neon or argon is formed in the translucent sealing tube 1. It can be manufactured by enclosing a rare gas such as mercury and mercury, and attaching the electrode 4 and the lead wire 5 to each of both end sides in the translucent sealing tube 1.
The near-infrared shielding film 2 can also be formed by coating the entire outer wall of the translucent sealing tube 1 and drying or drying / heat-treating it in the air. In this case, the near-infrared shielding film 2 needs to have a function as a protective film.

  According to this fluorescent lamp, since the coating film of the present embodiment is formed inside the translucent sealing tube, the coating film formed inside the translucent sealing tube has a wavelength band of 800 nm to 1000 nm. By shielding the infrared rays, it is possible to prevent the near infrared rays from leaking to the outside of the translucent sealing tube, and it is possible to prevent malfunction of electronic equipment such as a liquid crystal display device due to the near infrared rays. .

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited by these Examples.

"Example 1"
Tungsten oxide (W ₁₈ O ₄₉ ) powder having an average particle size of 70 nm was dispersed in 2-propanol containing a dispersant using a bead mill, and then the beads were separated to obtain 20% by mass of tungsten oxide (W ₁₈ O ₄₉ ). A tungsten oxide dispersion containing was prepared. Next, this dispersion and a silica binder were mixed to prepare a near-infrared shielding film-forming coating material containing 13.5% by mass of tungsten oxide and 2.5% by mass of silica binder.

Next, a glass tube for a fluorescent lamp is prepared, and the paint for forming a near-infrared shielding film is applied to the inner surface of the glass tube using a suction coating method so that tungsten oxide becomes 4.0 m ² / g. Then, drying was performed in the air at 90 ° C. for 5 minutes while air blowing, to produce a fluorescent lamp with a near-infrared shielding film of Example 1.

"Example 2"
A near-infrared shielding film-forming coating material of Example 2 was produced in the same manner as Example 1 except that tungsten oxide was 10.3% by mass and silica binder was 2.5% by mass.
Next, a glass tube for a fluorescent lamp is prepared, and the paint for forming a near-infrared shielding film is applied to the inner surface of the glass tube using a suction coating method so that tungsten oxide becomes 3.0 m ² / g. Then, drying was carried out in the air at 90 ° C. for 5 minutes while air blowing, to produce a fluorescent lamp with a near-infrared shielding film of Example 2.

"Example 3"
A near-infrared shielding film-forming coating material of Example 3 was produced in the same manner as in Example 1 except that 7.5% by mass of tungsten oxide and 2.5% by mass of silica binder were used.
Next, a glass tube for a fluorescent lamp is prepared, and the paint for forming a near-infrared shielding film is applied to the inner surface of the glass tube using a suction coating method so that tungsten oxide becomes 2.0 m ² / g. Then, drying was carried out in the air at 90 ° C. for 5 minutes while air blowing, to produce a fluorescent lamp with a near-infrared shielding film of Example 3.

Example 4
A near-infrared shielding film-forming coating material of Example 4 was prepared in the same manner as in Example 1 except that 2.5% by mass of tungsten oxide and 2.5% by mass of silica binder were used.
Next, a glass tube for a fluorescent lamp is prepared, and the paint for forming a near-infrared shielding film is applied to the inner surface of the glass tube using a suction coating method so that tungsten oxide becomes 0.7 m ² / g. Then, drying was performed while blowing air at 90 ° C. for 5 minutes in the atmosphere, and a fluorescent lamp with a near-infrared shielding film of Example 4 was produced.

"Comparative example"
A glass tube for a fluorescent lamp was prepared, and this glass tube was dried in the air at 90 ° C. for 5 minutes while air blowing, to give a comparative example.

“Evaluation of near-infrared shielding”
The near-infrared transmittance at a wavelength of 900 nm of each of the fluorescent lamps with a near-infrared shielding film of each of Examples 1 to 4 was measured using a spectrophotometer V-570 (manufactured by JASCO Corporation). Here, 20 fluorescent lamps with a near-infrared shielding film for each of Examples 1 to 4 were prepared, and Examples 1 to 4 when the near-infrared transmittance at a wavelength of 900 nm in the fluorescent lamp of the comparative example was set to 100 were used. The transmittance of near infrared rays at a wavelength of 900 nm of each of 20 fluorescent lamps with a near infrared shielding film was measured, and the average value was defined as the transmittance of each of Examples 1 to 4. Table 1 shows the measurement results. Moreover, the transmittance | permeability curve of the fluorescent lamp with a near-infrared shielding film of Example 1 is shown in FIG.

According to these evaluation results, in Example 1, a near-infrared shielding film in which the transmittance of near-infrared light having a wavelength of 900 nm was reduced to about 50% could be obtained.
In general, in order to reduce the near-infrared amount emitted from the display surface of a 60-inch size liquid crystal display device to the 30-inch size, which has not been a problem until now, the transmittance at a wavelength of 900 nm is reduced to about 50%. It is said that it is sufficient to reduce it.

  In Example 1, since the transmittance of near-infrared light having a wavelength of 900 nm can be reduced to about 50%, the amount of near-infrared emitted from the display surface of a 60-inch size liquid crystal display device has been a problem until now. It was found that the size could be reduced to a size equivalent to 30 inches that was not present. Therefore, it was found that a fluorescent lamp for a liquid crystal display device free from problems such as malfunction of the remote controller can be obtained.

Moreover, in Examples 2-4, the near-infrared shielding film which reduced the transmittance | permeability of the near-infrared of 900 nm wavelength to about 60%, 70%, and 90%, respectively was able to be obtained.
Therefore, it can be seen that the transmittance of near-infrared light having a wavelength of 900 nm can be controlled by controlling the content of tungsten oxide in the paint for forming a near-infrared shielding film and the area of the coating film per gram of tungsten oxide. It was.

It is a longitudinal cross-sectional view which shows the fluorescent lamp of one Embodiment of this invention. It is a cross-sectional view which shows the fluorescent lamp of one Embodiment of this invention. It is a figure which shows the transmittance | permeability curve of the fluorescent lamp with a near-infrared shielding film of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Translucent sealing tube 2 Near-infrared shielding film 3 Phosphor layer 4 Electrode 5 Lead wire G Filling gas

Claims (8)

  A fluorescent lamp paint comprising a near-infrared shielding substance and a solvent.   The fluorescent lamp paint according to claim 1, wherein the near-infrared shielding material contains tungsten oxide and / or composite tungsten oxide.   3. The fluorescent lamp paint according to claim 1, wherein the solvent contains a low boiling point organic solvent.   The fluorescent lamp paint according to claim 1, further comprising a protective film-forming substance.   A coating film formed by using the fluorescent lamp paint according to any one of claims 1 to 4.   A coating film characterized in that a coating film is formed by applying the fluorescent lamp paint according to any one of claims 1 to 4 on a substrate, and then drying or drying and heat-treating the coating film. Manufacturing method.   A fluorescent lamp comprising the translucent sealing tube formed with the coating film according to claim 5. The near-infrared shielding material contains tungsten oxide and / or composite tungsten oxide,
The fluorescent lamp according to claim 7, wherein the area of the coating film per 1 g of the tungsten oxide and / or the composite tungsten oxide is 2.0 m ² or more and 7.0 m ² or less.

Images