JP2011150970A - Ultraviolet ray shielding layer, fluorescent lamp, and manufacturing method of ultraviolet ray shielding layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a high ultraviolet ray shielding effect without impairing brightness of a lamp. <P>SOLUTION: The fluorescent lamp 10 is provided with a light emitting tube 11, a phosphor layer 13, and a protection layer 12 (an ultraviolet ray shielding layer) arranged between the light emitting tube 11 and the phosphor layer 13. The protection layer 12 is composed of a combined body of titanium oxide of particle shape and zinc oxide of particle shape. The thickness of the protection layer 12 is 3-5 μm. The protection layer 12 is formed by coating a plurality of times. The particle size of zinc oxide is 0.010-0.035 μm and the specific surface area of zinc oxide is 40-50 m<SP>2</SP>/g. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ultraviolet shielding layer, a fluorescent lamp, and a method for producing the ultraviolet shielding layer.

  In recent years, since ultraviolet rays emitted from fluorescent lamps may cause fading of products and the like and deterioration of foodstuffs, it is desired to shield ultraviolet rays in fluorescent lamps.

  Therefore, as described in Patent Documents 1 and 2, it has been proposed to form an ultraviolet shielding layer on a fluorescent lamp.

JP 2007-115642 A JP 7-138499 A

  However, even with the ultraviolet shielding layer having the structure disclosed in Patent Documents 1 and 2, it is difficult to obtain a sufficient ultraviolet shielding effect without impairing the brightness of the lamp.

  An object of the present invention is to obtain a high ultraviolet shielding effect without impairing the brightness of the lamp.

  The ultraviolet shielding layer according to the first aspect of the present invention comprises a combined body of particulate titanium oxide and particulate zinc oxide, and has a thickness of 3 to 5 μm.

  A fluorescent lamp according to a second aspect of the present invention includes an arc tube, a phosphor layer, and the ultraviolet shielding layer disposed between the arc tube and the phosphor layer.

  According to a third aspect of the present invention, there is provided a method for producing an ultraviolet shielding layer, comprising: producing a slurry containing titanium oxide particles and titanium oxide particles; and forming the slurry on a substrate by applying a plurality of times. Applying heat treatment to the applied film.

  According to the present invention, a high ultraviolet shielding effect can be obtained without impairing the brightness of the lamp.

It is a figure which shows the ring-shaped fluorescent lamp which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is a graph which shows the result of having measured the UV cut rate (ultraviolet ray shielding rate) and the brightness of the lamp | ramp about each sample from which the film thickness of a protective layer differs. It is a graph explaining the outline | summary of each sample used for experiment. It is a graph which shows the result of having measured the intensity distribution of the ultraviolet region of the light emitted from a fluorescent lamp about each fluorescent lamp which used each sample as a protective layer. It is a graph which shows the result of having measured the ultraviolet shielding rate about each sample. It is a flowchart which shows the manufacturing method of the ultraviolet-ray shielding layer which concerns on embodiment of this invention. It is a figure which shows a straight tube | pipe type fluorescent lamp. It is a figure which shows a lightbulb-shaped fluorescent lamp.

  Hereinafter, embodiments of the present invention will be described.

  As shown in FIGS. 1 and 2 (AA sectional view in FIG. 1), the fluorescent lamp 10 of the present embodiment includes a light-transmitting ring-shaped arc tube 11 (bulb) and a protective layer 12 (ultraviolet shielding). Layer) and the phosphor layer 13. That is, a plurality of (for example, two) layers are formed on the inner surface (inner peripheral surface) of the arc tube 11. In the present embodiment, the protective layer 12 is formed on the first layer (lower layer), and the phosphor layer 13 is formed on the second layer (upper layer). The protective layer 12 is disposed between the arc tube 11 and the phosphor layer 13.

  The fluorescent lamp 10 is, for example, a high-frequency lighting type fluorescent lamp. The fluorescent lamp 10 is used by being attached to a lamp holder of a pendant lighting device installed on a ceiling of a building, for example. Such pendant lighting fixtures often incorporate a lighting device made of a circuit board or the like on which electronic components are mounted. A high frequency voltage is output to the fluorescent lamp 10 by such a lighting device. The lighting method of the fluorescent lamp 10 is not limited to the high-frequency lighting type and is arbitrary. For example, a starter type fluorescent lamp may be used as the fluorescent lamp 10. The shape of the fluorescent lamp 10 is also arbitrary (see FIGS. 8 and 9 described later).

  The arc tube 11 is made of, for example, quartz glass. The tube shape (cross-sectional shape) of the arc tube 11 is, for example, a cylinder, and the tube diameter of the arc tube 11 is, for example, 20 to 32.5 mm. Note that fluorine or the like may be added to the quartz glass. The material of the arc tube 11 is not limited to quartz glass and is arbitrary. That is, the material of the arc tube 11 may be soft glass or hard glass. Further, the color of the arc tube 11 may be transparent, white, or other colors. For example, the arc tube 11 may be colored blue, green, ocher or red with a colorant such as cobalt oxide, chromium oxide, iron oxide, cadmium selenide, or cadmium sulfide.

  A discharge medium is enclosed in the arc tube 11. The discharge medium is, for example, mercury. Further, in order to protect the phosphor layer 13 and to suppress the absorption of ultraviolet rays, an inert gas such as Ne, Ar, or Kr is sealed in the arc tube 11 or the arc tube 11 is evacuated. .

  The arc tube 11 is provided with a base 11a. The base 11a has a connection pin 11b. By connecting the connection pin 11b to an external power source, a voltage is applied between the filament electrodes 11c and 11d, a discharge is generated in the arc tube 11, and the phosphor layer 13 emits light.

  The phosphor layer 13 includes phosphor particles that emit fluorescence when excited by ultraviolet rays. The phosphor particles are made of, for example, a halo-based phosphor, a three-wavelength phosphor, or a combination thereof. In the present embodiment, the phosphor layer 13 is composed of a combination of a halo phosphor and a three-wavelength phosphor.

The halo phosphor is, for example, calcium halophosphate Ca ₁₀ (PO ₄ ) ₃ FCl: Sb, Mn. By adjusting the ratio of Sb, Mn, F, and Cl, the halo-based phosphor can be excited by, for example, ultraviolet light, and can emit white or daylight light.

The phosphor material responsible for red of the three-wavelength phosphor is, for example, Y ₂ O ₃ : Eu or 3.5MgO · 0.5MgF · GeO ₂ : Mn. In addition, Y ₂ O ₂ S: Eu, Y (P, V) O ₄ : Eu, or the like may be used as the red phosphor material. Moreover, you may use combining these.

The phosphor material in charge of green of the three-wavelength phosphor is, for example, LaPO ₄ : Ce, Tb. In addition, CeMgAl ₁₁ O ₁₉ : Tb, Ce (Mg, Zn) Al ₁₁ O ₁₉ : Mn, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn, or the like may be used as the green phosphor material. Moreover, you may use combining these.

The phosphor material responsible for blue of the three-wavelength phosphor is, for example, BaMg ₂ Al ₁₆ O ₂₇ : Eu, (Mn), or (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu. In addition, (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl ₂ : Eu or the like may be used as the blue phosphor material. Moreover, you may use combining these.

  By adjusting the mixing ratio of the blue phosphor, the red phosphor, and the green phosphor, the three-wavelength phosphor can be excited by, for example, ultraviolet light, and can emit white or daylight light.

The density (application weight) of the phosphor layer 13 is, for example, 3 to 5 mg / cm ² . The phosphor layer 13 may contain a dispersant, a binder, a surface treatment agent, a lubricant, a drying agent, an antifoaming agent, a curing agent, or the like. The number of phosphor layers 13 is not limited to one, and may be a plurality of layers (for example, two layers).

  The protective layer 12 has a characteristic of passing visible light and shielding ultraviolet rays.

The protective layer 12 is made of a combination of particulate titanium oxide TiO ₂ and particulate zinc oxide ZnO. The particle diameter of titanium oxide is, for example, 0.015 to 0.03 μm. The particle diameter of zinc oxide is, for example, 0.010 to 0.035 μm. The BET (specific surface area) of titanium oxide is, for example, 40 to 50 m ² / g. The BET (specific surface area) of zinc oxide is, for example, 40 to 50 m ² / g. The density (application weight) of the protective layer 12 is, for example, 0.37 to 0.60 mg / cm ² .

The protective layer 12 may contain a dispersant, a binder, a surface treatment agent, a lubricant, a drying agent, an antifoaming agent, a curing agent, or the like. In particular, by mixing cerium oxide CeO ₂ in the protective layer 12, more effective UV cut performance can be obtained. However, since the appearance of the fluorescent lamp 10 is colored yellow when the amount of cerium oxide is too large, cerium oxide is preferably mixed in the protective layer 12 at a ratio of 10% or less. Furthermore, the effect can be increased by making the arc tube 11 contain cerium oxide.

  The film thickness d of the protective layer 12 is preferably 3 to 5 μm. When the film thickness d of the protective layer 12 is within this range, the fluorescent lamp 10 according to this embodiment can obtain a high ultraviolet shielding effect without impairing the brightness of the lamp. FIG. 3 shows the results of measuring the UV cut rate (ultraviolet ray shielding rate) and the brightness of the lamp for each of samples 1 to 4 having different thicknesses of the protective layer 12 (ultraviolet absorbing film). The thickness of the protective layer 12 in the sample 1 is 2.3 μm, the thickness of the protective layer 12 in the sample 2 is 3.6 μm, the thickness of the protective layer 12 in the sample 3 is 4.7 μm, and the sample 4 The thickness of the protective layer 12 is 5.5 μm. In FIG. 3, a line L1 is data related to the UV cut rate of the samples 1 to 4, and a line L2 is data related to the brightness of the lamps of the samples 1 to 4. As shown in FIG. 3, a high ultraviolet shielding effect can be obtained by setting the film thickness d to 3.0 μm or more. Further, in order not to cause interference that impairs the appearance (decreases the brightness of the lamp), it is preferable not to exceed 5.0 μm even in the portion having the maximum film thickness. Therefore, by setting the thickness d of the protective layer 12 to 3 to 5 μm, a high ultraviolet shielding effect can be obtained without impairing the brightness of the lamp.

  The protective layer 12 is formed by, for example, one application (one application) or a plurality of applications (for example, two application). If it is applied a plurality of times, the protective layer 12 can be easily formed thick. Moreover, it is thought that the ultraviolet shielding effect of the protective layer 12 formed by multiple application | coating is large.

  The experimental results of the fluorescent lamp 10 relating to this will be described with reference to FIGS.

  FIG. 4 is a chart for explaining the outline of the samples 11 to 13 used in this experiment. Samples 11 to 13 correspond to a protective layer.

Samples 11 and 12 are protective layers (UV cut materials) made of a combination of particulate titanium oxide TiO ₂ and particulate zinc oxide ZnO, as in the protective layer 12 of the present embodiment. Sample 11 is a film formed by a single coating using a 15 wt% aqueous solution with a bond ratio of TiO ₂ : ZnO = 1: 1 (weight ratio). The sample 12 is a film formed by coating twice using a 15 wt% aqueous solution having a bond ratio of TiO ₂ : ZnO = 1: 1 (weight ratio). Sample 11 is a protective layer having an adhesion amount of 330 mg and a film thickness of 3.6 μm. Sample 12 is a protective layer having an adhesion amount of 480 mg and a film thickness of 4.7 μm.

The sample 13 is a protective layer made of Al ₂ O ₃ . Sample 13 is a protective layer having an adhesion amount of 100 mg and a film thickness of about 1.8 μm.

  FIG. 5 shows the result of measuring the intensity distribution in the ultraviolet region of the light emitted from the fluorescent lamp for each fluorescent lamp using the samples 11 to 13 as a protective layer. In FIG. 5, a line L11 is data of the sample 11, a line L12 is data of the sample 12, and a line L13 is data of the sample 13. In FIG. 6, the result of having measured the ultraviolet shielding rate about each of the samples 11-13 is shown.

As shown in FIGS. 5 and 6, the ultraviolet shielding rate was highest in the sample 12 and then in the sample 11. Moreover, in the sample 13 using the protective layer of Al ₂ O ₃ , an ultraviolet shielding effect was hardly obtained. From these experimental results, it is considered that the ultraviolet shielding effect is dramatically improved according to the protective layer 12 of the present embodiment. Moreover, it is thought that the ultraviolet-ray shielding effect becomes large by performing application | coating twice (painting twice) rather than the case of coating once.

  The protective layer 12 is manufactured by a procedure as shown in FIG. 7, for example.

  In step S11, metal oxide particles (titanium oxide particles and zinc oxide particles) are generated. The metal oxide particles can be generated by, for example, a gas phase oxidation method, a neutralization crystallization method, or a sol-gel method. Since the metal oxide fine particles thus produced are present in an aggregated state, it is preferable to pulverize them using an appropriate method and stably maintain the dispersed state. As the crushing technique, for example, an ultrasonic method, a ball mill method, a bead mill method, or the like is effective. The diameter of the metal oxide particles can be measured by, for example, a laser Doppler method.

  In subsequent step S12, a slurry of metal oxide particles is generated. A slurry is generated by filling a container with metal oxide particles (titanium oxide particles and zinc oxide particles), a dispersion medium, and the like and stirring them. The stirring time is set according to, for example, the dispersion reaching particle size. As the dispersion medium for the slurry, an organic dispersion medium such as a polyhydric alcohol derivative or water is effective. You may add a dispersing agent (for example, beta-diketone), a binder (for example, beta-diketone metal complex), etc. to a slurry.

  In a subsequent step S13, a slurry of metal oxide particles is applied onto the arc tube 11 (base material) and dried. As a method for applying the slurry, for example, an air spray method, a flow coating method, a brush coating method, or a dipping method is effective. This application process is performed once (applied once) or applied multiple times (eg applied twice). If it is applied a plurality of times, a thick film can be easily formed.

  In subsequent step S14, heat treatment is performed on the film applied in step S13. Thereby, the metal oxide particles in the film are bonded (sintered), and the protective layer 12 is completed. A dense film free from cracks and pinholes can be formed by adjusting the slurry concentration, the added amount of the dispersant and binder, or the heat treatment conditions.

  Further, when the fluorescent lamp 10 is manufactured, the phosphor layer 13 is formed on the protective layer 12 by a known method. Thereafter, the arc tube 11 is evacuated. Immediately before the exhaust is finished, mercury necessary for light emission is enclosed in the arc tube 11 and then argon gas as a luminescent medium is encapsulated. Is completed.

  Although the ultraviolet shielding layer, the fluorescent lamp, and the method for manufacturing the ultraviolet shielding layer according to the embodiment of the present invention have been described above, the present invention is not limited to the above embodiment. For example, the present invention can be modified as follows.

  The fluorescent lamp 10 is not limited to an annular fluorescent lamp, and may be a straight tube fluorescent lamp as shown in FIG. 8, for example. For example, as shown in FIG. 9, the fluorescent lamp 10 may be a light bulb-shaped fluorescent lamp. In addition, the above-described protective layer 12 or the like may be applied to, for example, a U-shaped, L-shaped, V-shaped, or spiral fluorescent lamp. The shape of a corner such as a U shape, an L shape, or a V shape is arbitrary, and may be, for example, a right angle, an acute angle, an obtuse angle, or a rounded shape. Furthermore, the shape of the fluorescent lamp 10 may be a double ring shape, a twin shape, or a compact shape. The shape of the tube is not limited to a cylinder, and may be a square tube, for example. In addition, the tube diameter of the arc tube 11 is also arbitrary.

  The type of the fluorescent lamp 10 is arbitrary. For example, the fluorescent lamp 10 may be a hot cathode fluorescent lamp (HCFL) or a cold cathode fluorescent lamp (CCFL), or a dielectric barrier discharge fluorescent lamp (EEFL). It may be an external electrode fluorescent lamp such as a fluorescent lamp.

  The use of the fluorescent lamp 10 is arbitrary. The fluorescent lamp 10 may be used for, for example, in-vehicle illumination lights, emergency lights, decorative lights, etc. in addition to indoor and outdoor illumination lights. Furthermore, the configuration of the fluorescent lamp 10 is appropriately changed so that it can be applied to, for example, a backlight light source of a liquid crystal display, an eraser of a copying machine, a light source for reading a document in a FAX or a scanner, or a light source for various displays. Also good.

  In addition, the size, wattage, or light color of the fluorescent lamp 10 is also arbitrary. However, for general applications, the size is 4 to 110, the wattage is several watts to hundreds of watts, and the light color is preferably daylight, daylight white, white, warm white, or light bulb color. it is conceivable that.

  The constituent elements of the phosphor particles are arbitrary. For example, the phosphor material of the phosphor particles may be other than the materials shown in the embodiments. A plurality of light emitting layers having different emission colors may be used as the phosphor layer 13.

  The particulate titanium oxide and particulate zinc oxide in the protective layer 12 may be directly bonded or indirectly bonded via an intermediate.

  Regarding the other points as well, the configuration of the fluorescent lamp 10 and the type, performance, dimensions, material, shape, number of layers, or arrangement of the components can be arbitrarily changed without departing from the spirit of the present invention. it can. For example, a desired layer may be added between the arc tube 11, the protective layer 12, and the phosphor layer 13 depending on the application.

  The manufacturing method of the present invention is not limited to the contents and order shown in the flowchart of FIG. 7, and the contents and order can be arbitrarily changed without departing from the spirit of the present invention. Moreover, you may omit the process which is not required according to a use etc. For example, the metal oxide particle heat treatment step (step S14 in FIG. 7) may be performed together with the heat treatment on the phosphor after the phosphor is applied. Moreover, the formation method of the protective layer 12 is not limited to application | coating, For example, 1 time of CVD (Chemical Vapor Deposition) or multiple times of CVD may be sufficient.

  The embodiment of the present invention has been described above. However, various modifications and combinations required for design reasons and other factors are not limited to the invention described in the “claims” or the “mode for carrying out the invention”. It should be understood that it is included in the scope of the invention corresponding to the specific examples described in the above.

  The fluorescent lamp of the present invention is suitable for a residential lighting fixture or the like. The ultraviolet shielding layer of the present invention is suitable for coating a phosphor used in the fluorescent lamp. The method for producing an ultraviolet shielding layer of the present invention is suitable for producing the ultraviolet shielding layer.

DESCRIPTION OF SYMBOLS 10 Fluorescent lamp 11 Light emission tube 11a Base 11b Connection pin 11c, 11d Filament electrode 12 Protective layer 13 Phosphor layer

Claims (8)

Consists of a combination of particulate titanium oxide and particulate zinc oxide,
The film thickness is 3 to 5 μm.
An ultraviolet shielding layer characterized by that. Formed by multiple applications,
The ultraviolet shielding layer according to claim 1. The zinc oxide has a particle size of 0.010 to 0.035 μm, and the specific surface area of the zinc oxide is 40 to 50 m ² / g.
The ultraviolet shielding layer according to claim 1 or 2, wherein Containing cerium oxide in a proportion of 10% or less,
The ultraviolet shielding layer according to any one of claims 1 to 3, wherein the ultraviolet shielding layer is provided. Arc tube,
A phosphor layer;
The ultraviolet shielding layer according to any one of claims 1 to 4, which is disposed between the arc tube and the phosphor layer.
Comprising
A fluorescent lamp characterized by that. The phosphor layer includes calcium halophosphate and a three-wavelength phosphor,
The red of the three-wavelength phosphor includes Y ₂ O ₃ : Eu, or 3.5MgO · 0.5MgF · GeO ₂ : Mn,
The green of the three-wavelength phosphor includes LaPO ₄ : Ce, Tb,
The blue of the three-wavelength phosphor contains BaMg ₂ Al ₁₆ O ₂₇ : Eu, (Mn) or (Sr, Ca, Ba) ₅ (PO ₄ ) ₃ Cl: Eu,
The fluorescent lamp according to claim 5. The material of the arc tube is quartz glass containing cerium oxide.
The fluorescent lamp according to claim 5 or 6, wherein: Producing a slurry comprising titanium oxide particles and titanium oxide particles;
Forming the slurry on a substrate by multiple application;
Heat-treating the applied film;
including,
The manufacturing method of the ultraviolet-ray shielding layer characterized by the above-mentioned.

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