JP2010027452A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp having a high luminous flux maintenance factor while it is the fluorescent lamp increased in lamp output by increasing a tube-wall load by impressing a high input power. <P>SOLUTION: The lamp La1 is provided with a glass bulb 4 in which a phosphor layer 3 containing a plurality of kinds of phosphor particles is formed, a pair of stems 5 which seal the both ends of the glass bulb 4, a filament coil 7 which is installed between a pair of lead wires 6, 6 penetrating each stem 5 and is composed of a main wire and a sub-wire wound around the main wire, and an electron emitting substance 8 held by each filament coil 7. The wire diameter of the main wire is 65 μm or more and 100 μm or less, and the tube-wall load of the lamp at the time of lighting is 0.05 W/cm<SP>2</SP>or more. One of the plurality of kinds of phosphor particles is aluminate phosphor particles which has bivalent europium as an emission center, with central particle size of 2.5 μm or more and 5.5 μm or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp.

Fluorescent lamps have been widely used as illumination sources for general lighting purposes, and have improved lamp performance such as life, luminous flux, and lamp efficiency.
Commonly used fluorescent lamps include, for example, a high-frequency lighting dedicated straight tube fluorescent lamp (for example, FHF32) and a rapid start type straight tube fluorescent lamp (for example, FLR40S). Such a fluorescent lamp is referred to as a “conventional product”.

Compared to the conventional product, this conventional product has a fluorescent lamp that has substantially the same shape and dimensions, but has improved lamp performance by applying higher input power and increasing the tube wall load compared to the conventional product (so-called fluorescent lamp) , G-Hf fluorescent lamp). The lamp with improved lamp performance is referred to as an “improved product” in order to distinguish it from the conventional product.
With this improved product, the light output per lamp is about 2.1 times that of the conventional product, which makes it possible to reduce the number of lamps required to obtain the desired brightness, and thus a waste lamp generated when the lamp is replaced. It has been attracting attention in recent years because it can save resources by reducing the amount of material used.

Furthermore, the lamp life can be increased to 18000 hours or more, which greatly exceeds the average life of 12,000 hours of the conventional product, and resource saving can be achieved by reducing the lamp replacement frequency (for example, Patent Document 1 and Non-patent document 1).
Note that the life of a general fluorescent lamp is defined by test conditions and methods in Annex C of JIS C 7617-2 and Annex C of JIS C 7618-2. When the ratio of the lamp luminous flux after the lighting time (so-called luminous flux maintenance factor) is reduced to 70 (%), the fluorescent lamp is considered to have a lifetime.
JP 2008-123998 A Matsushita Electric Industrial Co., Ltd., “G-Hf Fluorescent Lamp”, Matsushita Electric Industrial Co., Ltd. Catalog “Lamp General Catalog 2007”, page 96

  The improved product has a superior lamp performance as compared with the conventional product, but further, there is a demand for a product that can maintain the brightness at the beginning of lighting as long as possible. In other words, the ratio of the luminous flux of the lamp after 18000 hours of lighting (luminous flux maintenance factor) to the luminous flux of the lamp after 100 hours of lighting is required to be 80 (%) or more, and there are many various attempts to satisfy this requirement. Has been made.

  However, in the technology performed in the improved product to increase the lamp wall load by increasing the tube wall load by applying high input power, for example, as shown in 207 page of IESNA Lighting Handbook-8th Edition (1993). Since the luminous flux maintenance factor of the fluorescent lamp is greatly deteriorated as the wall load increases, it is impossible to realize it even though further improvement of the luminous flux maintenance factor is desired.

  In order to solve the above-mentioned problems, the present invention provides a fluorescent lamp having a high luminous flux maintenance factor, although it is a fluorescent lamp in which the lamp wall load is increased by applying a high input power to increase the lamp output. is there.

In order to achieve the above object, a fluorescent lamp according to the present invention includes a glass bulb on which a phosphor layer containing a plurality of types of phosphor particles is formed, a pair of stems for sealing both ends of the glass bulb, A filament coil constructed between a pair of lead wires penetrating each stem and comprising a main line and a sub-wire wound around the main line, and an electron emission material held by the filament coil, A fluorescent lamp having a wire diameter of 65 μm or more and 100 μm or less and a lamp tube wall load at the time of lighting of 0.05 W / cm ² or more, wherein one kind of the plurality of kinds of phosphor particles is divalent The aluminate phosphor particles are characterized in that the center particle diameter (D ₅₀ ) having europium as the emission center is in the range of 2.5 μm or more and 5.5 μm or less.

The “center particle diameter (D ₅₀ )” herein is a so-called median diameter, and is a particle diameter that is 50 (%) in a volume-based integrated distribution.

In particular, the fluorescent lamp according to the present invention has a central particle size (D ₅₀ ) having one kind of a plurality of kinds of phosphor particles having divalent europium as an emission center in a range of 2.5 μm or more and 5.5 μm or less. From the test, it can be confirmed that the ratio of the lamp luminous flux after the lighting time of 18000 hours to the lamp luminous flux after the lighting time of 100 hours is 80% or more by using the aluminate phosphor particles in FIG. .

Further, in addition to the above effects, by using the phosphor particles, for example, even when used in an illumination space where a large number of fluorescent lamps are installed, the difference in emission color between both ends of the fluorescent lamp (hereinafter referred to as “light emission”). It was also confirmed that “color difference” is not inconvenient within a practical tolerance.
Further, a protective film is formed between the glass bulb and the phosphor layer, and the thickness of the protective film is in the range of 1 μm to 3 μm. Alternatively, the electron-emitting substance has a weight in the range of 5 mg to 11 mg.

An embodiment in which the fluorescent lamp according to the present invention is applied to a straight tube fluorescent lamp defined in JIS C 7617-2 will be described. In addition, the fluorescent lamp concerning this invention can be used as a fluorescent lamp prescribed | regulated by JISC7617-2 or JISC7618-2, for example.
Further, the shape of the fluorescent lamp is not limited to the straight tube type, and can be applied to an annular type, a double ring type, a compact type, and the like.
1. FIG. 1 is a partial cross-sectional view of a fluorescent lamp according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a filament coil, (a) is an overall schematic diagram thereof, b) is an enlarged view of a portion X in (a).

FIG. 1 shows only one end portion of the fluorescent lamp, and the other end portion is the same as this, and the description thereof is omitted. 1 and 2 illustrate the present embodiment, and the dimensional ratios of the members are different from the actual ones.
As shown in FIG. 1, a fluorescent lamp La1 includes a glass bulb 4 having a protective film 2 and a phosphor layer 3 formed on the inner surface, and a pair of lead wires penetrating a portion where the end of the glass bulb 4 is sealed. A filament coil 7 installed at the tip of 6 and 6 (the end in the glass bulb 4) and a base 9 attached to the end of the glass bulb 4 are provided.

  In the present embodiment, the pair of lead-in wires 6 and 6 penetrates the stem 5, and a part of the lead-in wires 6 and 6 projects into the glass bulb 4 from the portion of the stem 5 located inside the glass bulb 4. Has been established. Further, the end of the glass bulb 4 is sealed by the stem 5. A rare gas such as neon gas, argon gas, krypton gas, or a mixed gas containing a plurality of these gases and mercury are sealed in the glass bulb 4 whose end is sealed.

  As shown in FIG. 2, the filament coil 7 is formed of a main wire 7a formed of a metal wire, for example, a tungsten wire, and a metal wire (eg, tungsten wire) wound around the main wire 7a. A secondary winding coil formed by secondary winding a primary winding coil that is formed by primary winding of the main wire 7a around which the secondary wire 7b is wound. It is a triple coil.

The filament coil 7 holds an electron emission material 8 (see FIG. 1). As the electron-emitting substance, for example, a substance containing barium oxide, strontium oxide, calcium oxide or the like as a main component can be used.
The stem 5 is a so-called flare stem and seals both ends of the glass bulb 4. At least one of the stems 5 and 5 is used for exhausting the inside of the glass bulb 4 sealed at both ends (so-called airtight) or enclosing mercury or a rare gas. A narrow tube is provided.

The narrow tube is chip-off sealed after exhausting the glass bulb 4 and the like.
The base 9 is, for example, a G type (more specifically, G13), and has a pair of base pins 10 and 10, and the filament coil 7 is attached to the base pins 10 and 10 in the glass bulb 4. A pair of installed lead wires 6 and 6 are electrically connected. The base 9 is fixed to the end of the glass bulb 4 with a fixing agent (for example, cement or the like).

The fluorescent lamp La1 according to the present embodiment has the above-described basic configuration, and the lifetime of the fluorescent lamp La1 is generally used so far by configuring the filament coil and the phosphor layer as follows. It becomes feasible to achieve 18000 hours or more, which greatly exceeds the average life of 12000 hours of the fluorescent lamp.
2. Filament coil In the fluorescent lamp La1 of this embodiment, by applying high input power, the tube wall load is increased and the lamp output is increased. Therefore, the wire diameter D1 of the main wire 7a is preferably in the range of 65 (μm) to 100 (μm) in order to make the surface temperature of the filament coil 7 appropriate when the lamp is turned on.

This is because when the wire diameter D1 is less than 65 (μm), the main wire 7a is too thin, the surface temperature becomes too high, the electron emitting material 8 is consumed quickly, the lamp life is shortened, and conversely the wire diameter D1. Is more than 100 (μm), the main line 7a is too thick, so that the surface temperature sufficient for the electron emitting material 8 to function cannot be obtained, and the electron emitting material 8 cannot emit thermal electrons.
Further, the wire diameter of the sub-wire 7b is preferably in the range of 15 (μm) to 45 (μm). This is because, in the manufacture of the filament coil 7, if the wire diameter of the sub wire 7b is less than 15 (μm), the strength of the sub wire 7b is insufficient, so that the sub wire 7b is likely to be disconnected. This is because the workability when the auxiliary wire 7b is wound around the main wire 7a is remarkably deteriorated.

The amount of the electron emitting substance 8 in the range of 5 (mg) to 11 (mg) is attached to one (one) filament coil 7. Thereby, the time until the electron emission material 8 is completely consumed by the lamp lighting, which will be described later, can be set to about 18000 hours to 30000 hours, which is sufficient as a practical lamp lighting time.
3. Protective Film and Phosphor Layer The protective film 2 is applied to the inner peripheral surface of the glass bulb 4 (that is, the protective film 2 and the glass bulb 4 are in contact), and the phosphor layer 3 is formed on the protective film 2. Is applied.

The protective film 2 uses, for example, fine particles of an inorganic metal oxide in which aluminum oxide, silicon dioxide, yttrium oxide, cerium oxide, titanium oxide, zinc oxide or the like is used alone or in combination.
The thickness of the protective film 2 is preferably in the range of 1 (μm) to 3 (μm). That is, by setting the film thickness to 1 (μm) or more, the reaction between mercury enclosed in the glass bulb 4 and the glass bulb 4 is suppressed, and the luminous flux maintenance factor of the fluorescent lamp La1 as the tube wall load increases. It becomes possible to suppress or improve the deterioration of. In addition, by setting the film thickness to 3 (μm) or less, the phosphor layer 3 formed on the protective film 2 can be prevented from falling off the glass bulb 4 during lamp manufacture or during handling after lamp manufacture.

The phosphor layer 3 has a function of converting mainly 253.7 (nm) ultraviolet rays radiated from mercury excited in the discharge space in the glass bulb 4 into visible light, and blue, green, It is composed mainly of mixed phosphor particles composed of three kinds of phosphor particles that emit red light.
The phosphor particles (types) emitting blue light include aminate phosphor particles whose emission center is at least divalent europium, and the center particle size (D ₅₀ ) of the phosphor particles is 2.5 (μm). ) Is preferably in the range of 5.5 (μm) or less. The reason for this will be described later. Note that a laser diffraction particle size distribution analyzer SALD-2000A (manufactured by Shimadzu Corporation) is used for the measurement of the center particle size (D ₅₀ ) of the phosphor particles.

The phosphor particles that emit green light include, for example, phosphate phosphor particles whose emission centers are trivalent cerium and trivalent terbium, and the center particle diameter (D ₅₀ ) of the phosphor particles is 3.5. It is preferably in the range of not less than (μm) and not more than 6.0 (μm). This is because within this range, a fluorescent lamp La1 having a phosphor layer with high efficiency and good appearance quality can be obtained.

The phosphor particles emitting red light include, for example, oxide phosphor particles having a luminescence center of trivalent europium, and the center particle size (D ₅₀ ) is 5.0 (μm) or more and 7.5 (μm). ) The following range is preferred. This is because within this range, a fluorescent lamp La1 having a phosphor layer with high efficiency and good appearance quality can be obtained.
4). Manufacturing Method of Fluorescent Lamp A manufacturing method of the fluorescent lamp La1 will be described.

First, phosphor particles obtained by mixing the above-described plural types (specifically, three types) are either water or an organic solvent as a solvent, a binder made of a polymer soluble in the solvent, and a fluorescent lamp La1. At the completion of the step, the phosphor layer 3 containing the mixed phosphor particles as a main component is mixed with a binder or the like for binding so as not to drop out of the glass bulb 4 to prepare a phosphor suspension.
Then, the phosphor suspension is applied by pouring the phosphor suspension into the inner surface of the glass bulb 4 on which the protective film 2 has been formed in advance, and then the longitudinal direction of the glass bulb 4 is supported vertically (30 ( The phosphor layer 3 is formed by heating the phosphor suspension to 100 [deg.] C. and drying the phosphor suspension. Subsequently, the glass bulb 4 on which the phosphor layer 3 is formed is fired at about 500 (° C.) to 700 (° C.).

On the other hand, separately from the above steps, a stem 5 on which a pair of lead-in wires 6 and 6 on which a filament coil 7 holding an electron-emitting substance 8 is laid is provided in advance.
And the stem 5 is sealed to the edge part of said glass bulb | bulb 4 after baking. Subsequently, the glass bulb 4 is evacuated, and the electron emission material 8 is activated by energizing the filament coil 7, preferably filled with rare gas and mercury having a gas pressure of 200 (Pa) to 400 (Pa). Complete the tube.

Finally, a base 9 having a pair of base pins 10 and 10 fixed thereto is attached to the end of the arc tube, and the pair of base pins 10 and 10 are electrically connected to the pair of lead-in wires 6 and 6, respectively. Thus, the fluorescent lamp La1 is obtained.
5). Contents of examination As a result of examining the improvement of the luminous flux maintenance factor in the fluorescent lamp in which the lamp wall load is increased by increasing the tube wall load, the center particle diameter (D ₅₀ ) of the blue phosphor particles is set within the specific range. As a result, it was found that a high luminous flux maintenance factor can be obtained while applying a high input power to increase the tube wall load and increase the lamp output. This will be described in detail below.
(1) Test contents First, the center particle diameter (D ₅₀ ) of the phosphor particles and the tube wall load were changed, and the lamp efficiency and luminous flux maintenance factor at that time were measured. Specifically, aluminate phosphor particles having a composition BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , which is divalent europium, are used as phosphor particles that emit blue light, and trivalent cerium is used as phosphor particles that emit green light. LaPO ₄ : Ce ³⁺ , Tb ³⁺ phosphate phosphor particles having trivalent terbium as the emission center are used, and Y ₂ O ₃ : Eu having trivalent europium as the emission center is used for the phosphor particles emitting red light. ³⁺ oxide phosphor particles were used. The green phosphor has a center particle size (D ₅₀ ) of 4.5 (μm), and the red phosphor particles have a center particle size (D ₅₀ ) of 6.0 (μm).

The green phosphor particles and the red phosphor particles are as described above, and the center particle diameter (D ₅₀ ) of the blue phosphor is 2.0 (μm), 2.5 (μm), 3.5 (μm), 5.5. Five types (μm) and 6.0 (μm) are used.
For the fluorescent lamps used in the test, a plurality of straight tube fluorescent lamps dedicated to high-frequency lighting having a tube diameter of 25.5 (mm) and a tube length of 1198 (mm) were prepared for the various phosphor layers. In addition, argon is used for the rare gas enclosed in the glass bulb, the gas pressure is 240 (Pa) to 340 (Pa), and the correlated color temperature of the light color of the fluorescent lamp is 5000 (K) to 5100 (K). ).

In the lighting of the fluorescent lamp, the tube wall load is 0.05 (W / cm ² ) (corresponding to an input voltage 45 (W)) and 0.07 (W / cm ² ) (corresponding to an input voltage 63 W). The lamp efficiency and luminous flux maintenance factor are measured under the following two conditions.
For comparison, the blue phosphor particles have a center particle size (D ₅₀ ) having divalent europium as the emission center of 2.0 (μm), 2.5 (μm), and 3.5 (μm). A plurality of fluorescent lamps using halophosphate phosphor particles of 5.5 (μm) and 6.0 (μm) in composition (SrCaBa) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ were prepared, and the same The lamp efficiency and luminous flux maintenance factor were measured under the condition of tube wall load.

In addition to the above measurement, the color difference ΔC between the two ends of the lamp is measured.
The light emission color difference ΔC at both ends of the lamp means that the chromaticity coordinates on the CIE1931 chromaticity diagram of the light emission color of the portion 12 (cm) inside from one end of the fluorescent lamp are (x ₁ , y ₁ ) ((X ₁ −x ₂ ) ² + (y ₁ −y) when the chromaticity coordinates on the CIE1931 chromaticity diagram of the lamp emission color of the portion 12 cm inside from the end of the end cap are (x ₂ , y ₂ ) ₂ ) ² ) The value was set to ^1/2 .

  As a result of studying the direct or indirect visual influence of the emission color difference ΔC at both ends of the lamp and the actual lamp light, the inventors have found that, for example, in an illumination space where a large number of lighting fixtures equipped with fluorescent lamps are installed, The end of the fluorescent lamp mounted on the lamp and the other end of the fluorescent lamp mounted on the adjacent lighting fixture may be disposed at a close distance. When the emission color color difference ΔC exceeds 0.0050, It has been found that the difference in emission color is too large, resulting in an uncomfortable feeling and unacceptable in practice.

For this reason, the inventors aim for a lamp light flux ratio after 18000 hours of lighting (light flux maintenance factor) of 80% or more with respect to the lamp light flux after 100 hours of lighting time, and the emission color color difference ΔC is 0. .0050 or less is targeted.
(2) Measurement Results FIG. 3 shows measurement results of the various lamp efficiencies and luminous flux maintenance factors.

The lamp efficiency in the figure (represented simply as “efficiency” in the figure) is for the lighting time of 100 hours, and the luminous flux maintenance factor at the lighting time of 18000 hours is after the lighting time of 100 hours. The ratio of the lamp luminous flux after the lighting time of 18000 hours with respect to the lamp luminous flux, and the emission color color difference ΔC at both ends of the lamp, which is a practically important characteristic in a fluorescent lamp, is that after the lighting time of 100 hours. .
(3) Lamp efficiency As is clear from FIG. 3, the lamp efficiency greatly exceeds 80 (lm / W), which is a standard for high-efficiency fluorescent lamps, at all levels regardless of the tube wall load. there were.

In relation to the tube wall load, the lamp efficiency is higher at 0.05 (W / cm ² ) where the tube wall load is lower than at 0.07 (W / cm ² ) where the tube wall load is high. This tendency is seen in both the aluminate phosphor particles and the halophosphate phosphor particles.
On the other hand, in the relationship between the mean particle size of the phosphor particles (D _50), according to the center particle size (D ₅₀₎ increased, efficiency becomes high with this trend, aluminate phosphor particles and halophosphate It is seen in both phosphor particles of acid salt phosphor particles.
(4) Luminous flux maintenance factor As shown in FIG. 3, in the luminous flux maintenance factor, when the tube wall load is set to 0.05 (W / cm ² ), the composition of phosphor particles that emit blue light (aluminic acid). Both the phosphor particles of the salt phosphor particles and the halophosphate phosphor particles) or the central particle diameter (D ₅₀ ), the luminous flux maintenance rate exceeded 80 (%), all were good, but the tube wall load Was turned on at 0.07 (W / cm ² ), it was found that it changed greatly depending on the composition of the phosphor particles emitting blue light and the central particle size (D ₅₀ ).

That is, it is possible to obtain a high luminous flux maintenance factor exceeding 80 (%), which greatly exceeds the luminous flux maintenance factor at the rated lifetime at 70 (%) which is a standard defined in JIS C 7617-2 and JIS C 7618-2. It was found that it is possible to use aluminate phosphor particles having a center particle size (D ₅₀ ) of 2.5 (μm) or more (Examples 1 to 3 and Comparative Example 2). This is considered that the aluminate phosphor particles having an appropriate center particle diameter (D ₅₀ ) exhibit excellent deterioration resistance particularly when the tube wall load is increased.
(5) Luminescent color difference In the luminous color difference ΔC at both ends of the lamp, when halophosphate phosphor particles are used (Comparative Examples 5 to 9), within 0.0050 regardless of the central particle diameter (D ₅₀ ). However, when aluminate phosphor particles were used, there was a large difference depending on the center particle size (D ₅₀ ), and 2.0 μm ≦ D ₅₀ ≦ 5.5 μm (center particle size (D ₅₀ )). Is 2.0 (μm) or more and 5.5 (μm) or less.) When specific aluminate phosphor particles having a narrow center particle diameter (D ₅₀ ) are used (Examples 1 to 3 and Comparative Example 1) were found to be within 0.0050.

This is derived from the method of forming the phosphor layer, and as the glass bulb becomes longer, the phosphor particles that emit blue light, green light, and red light are attached to the inner surface of the glass bulb at different rates at both ends of the lamp. When using aluminate phosphor particles having a particle shape relatively close to a plate shape in which the minor axis length of the phosphor particles is approximately ½ or less of the major axis length of the particles, It is considered that the influence of the central particle size (D ₅₀ ) is increased, and a large difference appears in the emission color difference ΔC between both ends of the lamp.
(6) Summary As described above, it is possible to satisfy all the characteristics of the lamp efficiency, the luminous flux maintenance factor, and the luminescent color difference, and the central particle size (D ₅₀ ) in a narrow range of 2.5 μm ≦ D ₅₀ ≦ 5.5 μm. It was found that this is the case (Examples 1 to 3) in which specific aluminate phosphor particles having the above are used.

By using aluminate phosphor particles having a central particle diameter (D ₅₀ ) in such a range, a high input power is applied to increase the tube wall load and increase the lamp output. It has become possible to obtain a practical fluorescent lamp having a high luminous flux maintenance factor and an emission color color difference between both ends of the lamp within an allowable range and high industrial utility value.
6). Background of the Invention In the background art, the conventional product and the improved product have been described, but the comparison with the lamp according to the present invention (hereinafter referred to as “invention product”) will be described.

FIG. 4 is a conceptual diagram showing the luminous flux maintenance factor of each lamp.
“A” in the figure represents a conventional product in the background art, and “B” represents an improved product in the background art.
The conventional product “A” has a lighting time of 12000 hours with a luminous flux maintenance factor of 70%, whereas the improved product “B” has a luminous flux maintenance factor of 70%. The time is 18000 hours. Thus, the lighting time when the luminous flux maintenance factor becomes 70 (%) is improved by about 1.5 times in the improved product compared to the conventional product.

On the other hand, as explained in an example in the background art, the light output per lamp is increased from the conventional product by increasing the tube wall load.
As described above, the improvement in lamp characteristics from the conventional product to the improved product has been achieved by improving the filament coil, the protective film, etc., but the improvement of the filament coil is particularly significant. That is, first, we found a filament coil configuration that can increase the light output by increasing the tube wall load, and can achieve a life that greatly exceeds the conventional product even if the tube wall load applied to the fluorescent lamp is increased in this way. Is possible.

In addition, when only the tube wall load is increased with the configuration of the conventional product as it is, the luminous flux maintenance factor is greatly deteriorated and the behavior of “C” in the figure is exhibited. Further, since the exhaustion of the electron-emitting substance becomes intense, in some cases, the electron-emitting substance is exhausted (so-called emitter-less state), and the lighting is stopped after about 6000 hours.
The product of the invention is “D” in FIG. 4, and the luminous flux maintenance factor is further increased as compared with the improved product.

  The tube wall load, the filament coil 7 and the electron emission material 8 are the same as the improved product, but the blue phosphor particles contained in the phosphor layer are aluminate phosphor particles, and the center particle size is 2 This is achieved by setting the thickness in the range of not less than 0.5 (μm) and not more than 5.5 (μm).

  INDUSTRIAL APPLICABILITY The present invention can be used for a fluorescent lamp having a high luminous flux maintenance factor even though it is a fluorescent lamp in which the lamp wall output is increased by applying a high input power to increase the lamp output.

FIG. 1 is a partial cross-sectional view of a fluorescent lamp according to an embodiment of the present invention. 2A and 2B are diagrams showing an example of a filament coil, in which FIG. 2A is a schematic diagram of the whole, and FIG. 2B is an enlarged view of a portion X in FIG. It is a figure which shows the measurement result of the lamp | ramp characteristic of a fluorescent lamp. It is a figure which shows the luminous flux maintenance factor of each lamp | ramp.

Explanation of symbols

2 Protective Film 3 Phosphor Layer 4 Glass Bulb 5 Stem 6 Lead 7 Filament Coil 7a Main Line 7b Sub Line 8 Electron Emission Material 9 Base 10 Base Pin La1 Lamp

Claims (3)

A glass bulb in which a phosphor layer containing a plurality of types of phosphor particles is formed, a pair of stems for sealing both ends of the glass bulb, and a main line spanned between a pair of lead wires penetrating each stem A filament coil comprising a secondary wire wound around the main wire, and an electron-emitting material held by each filament coil, the wire diameter of the main wire being in the range of 65 μm to 100 μm, Lamp tube wall load of 0.05 W / cm ² or more,
One kind of the plurality of kinds of phosphor particles is an aluminate phosphor particle having a center particle diameter (D ₅₀ ) having divalent europium as a light emission center in a range of 2.5 μm or more and 5.5 μm or less. A fluorescent lamp characterized by being. The fluorescent lamp according to claim 1, wherein a protective film is formed between the glass bulb and the phosphor layer, and the film thickness of the protective film is in a range of 1 μm to 3 μm. The fluorescent lamp according to claim 1 or 2, wherein the weight of the electron-emitting substance is in a range of 5 mg to 11 mg.

Images