JPH09265946A - Fluorescent lamp and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To illuminate for a while by the afterglow of a phosphor having afterglow capability after lights-out to ensure safety in power failure by forming a first layer with strontium aluminate having afterglow capability on the inner circumferential surface of a gastight container. SOLUTION: A fluorescent lamp 1 builds in a pair of electrodes which is a discharge generating means so as to face in a straight tube-shaped glass bulb 2 which is a gastight container. A suitable amount of mercury which is a discharge medium and noble gas are sealed in the bulb 2. A phosphor having afterglow capability is applied to almost the whole inner circumferential surface of the bulb 2 to form a first layer 5, and visible light emitting phosphor is formed on the inner circumferential surface of the first layer 5 as a second layer 6. As the phosphor having afterglow capability, a luminous material mainly comprising strontium aluminate which emits a bluish green color or a green color and a luminous material mainly comprising zinc sulfide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp and a lighting device that emit afterglow after being turned off.

[0002]

2. Description of the Related Art Conventionally, since a fluorescent lamp of this kind goes into a dark state immediately after being turned off at night, if a slight illuminance is required before going to bed, a lighting device equipped with a night light and a changeover switch. Need to use. Further, if the fluorescent lamp is turned off during a power failure at night in a room without an emergency light or the like, it is necessary to move in the dark, which is dangerous and may cause confusion.

Therefore, the one described in Japanese Utility Model Laid-Open No. 5-41058 is known. In this product, the first layer is formed of a phosphorescent substance made of copper-activated zinc sulfide (ZnS: Cu),
The second layer is formed of a visible light emitting phosphor.

[0004]

However, in such a conventional fluorescent lamp, the amount of afterglow radiation after extinguishing is small, and a very large illuminance cannot be obtained when extinguished or during a power failure.

In addition, the persistence of the afterglow emission of conventional materials is short, which is not satisfactory.

Further, the illuminance at the time of normal lighting, the amount of afterglow radiation, etc. are influenced by the manufacturing conditions such as the film thickness, so that the product is not satisfactory.

It is an object of the present invention to provide a fluorescent lamp that emits afterglow radiation having a relatively long illuminance and is relatively long even after the light is turned off.

[0008]

According to a first aspect of the present invention, an airtight container enclosing a discharge medium; discharge generating means for generating an electric discharge in the airtight container; and an afterglow property on the inner peripheral surface side of the airtight container. A strontium aluminate phosphor having a first layer; and a second layer having a visible light emitting phosphor formed on an inner peripheral surface of the first layer; To do.

In the present invention, the shape of the airtight container may be a straight shape, a ring shape, a bent shape or the like.

According to the present invention, since the first layer of the strontium aluminate phosphor having afterglow is formed on the inner peripheral surface side of the airtight container such as the glass bulb, after the fluorescent lamp is turned off. Even in the above, it is possible to illuminate for a while by the afterglow of the afterglow phosphor. Therefore, it is possible to obtain the same illuminance as that of the night light until a certain period of time elapses without sudden darkening when turned off at night. In addition, even if a sudden power failure occurs, some measures such as emergency evacuation can be taken during the afterglow emission, so that the safety can be improved.

According to a second aspect of the present invention, there is provided an airtight container containing a discharge medium; a discharge generating means for generating an electric discharge in the airtight container; and a phosphor in which a visible light emitting phosphor is mixed with a strontium aluminate phosphor. A first layer formed; first
A second layer formed by forming a visible light emitting phosphor on the inner surface of the layer;
And a layer;

According to this claim, on the inner peripheral surface of the airtight container,
Alternatively, a first layer is formed on the protective film by mixing a strontium aluminate phosphor having a strong afterglow property and a visible-light-emitting phosphor that have been adjusted to a target chromaticity in advance, and then a visible light is formed on the first layer. Since the second layer made of the light-emitting phosphor is formed, color matching can be easily performed without strictly setting the film thickness, and mass productivity can be improved.

The invention of claim 3 is characterized in that the amount of the afterglow phosphor in the first layer is 20 to 80% by weight.

The invention of claim 4 is characterized in that the visible light emitting phosphor is a three-wavelength region emitting phosphor.

The invention of claim 5 is characterized in that the strontium aluminate phosphor has an average primary particle size of 3 to 15 μm.

The invention of claim 6 is characterized in that the film thickness of the first layer is 5 to 50 μm.

The invention of claim 7 is characterized in that the film thickness of the second layer is 10 to 30 μm.

Therefore, since each of the inventions of claims 3 to 7 also comprises the afterglow phosphor of claim 1 or 2, it has substantially the same effect as the invention of claim 1 or 2. be able to.

The invention according to claim 8 is characterized by comprising the fluorescent lamp according to any one of claims 1 to 7; and an instrument main body for supporting the fluorescent lamp.

According to the present invention, since it has the fluorescent lamp according to any one of claims 1 to 7, it has substantially the same operational effect as the invention of claims 1 to 7.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5, the same or corresponding parts are designated by the same reference numerals.

FIG. 2 is a front view of the fluorescent lamp 1 according to the first embodiment of the present invention, and FIG. 1 is an end view of a section taken along the line II of FIG. 2. In these drawings, the fluorescent lamp 1 is For example, a pair of electrodes 3a and 3b, which are electric discharge generating means, are arranged facing each other in a straight tubular glass bulb 2 which is an airtight container. A pair of caps 4 is provided at both axial ends of the valve 2.
a and 4b are mounted respectively, and the bases 4a and 4b are electrically connected to the electrodes 3a and 3b. The bulb 2 is filled with an appropriate amount of mercury as a discharge medium and a rare gas.

Then, as shown in FIG. 1, a phosphor having an afterglow property is deposited on substantially the entire inner peripheral surface of the bulb 2 or a protective film (not shown) deposited on the inner peripheral surface. To form the first layer 5. The thickness of the phosphor of the first layer 5 is 5 to 50.
μ, and the average primary particle size is 3 to 15 μm. As the phosphor having afterglow property, as shown in Table 1 below, a phosphorescent material A having a strong afterglow property and having strontium aluminate as a main component, which emits blue-green to green light, and zinc sulfide as a main component. There is a luminous material B or the like.

[0024]

[Table 1]

The phosphorescent material A is a phosphorescent material manufactured by Nemoto Special Chemical Co., Ltd., and is strontium aluminate (SrAl ₂ O).
₄ ) as the main component, particle size 7 to 13 μm, excitation wavelength 200
˜450 nm, emission peak wavelength 520 nm.

The phosphorescent material B contains zinc sulfide (ZnS) as a main component, has a particle size of 21 μm, an excitation wavelength of 200 to 450 nm, and an emission peak wavelength of 530 nm.

The afterglow brightness of the phosphorescent materials A and B is the afterglow brightness after 1 minute after irradiation with a lamp at an illuminance of 200 lux for 10 minutes, and the afterglow brightness of the phosphorescent material A is about 3.0 cd / m ^2.
As described above, the luminous material B has a density of about 0.4 cd / m ² .

The visible time of the luminous materials A and B is
When irradiated for 4 minutes with an illuminance of 200 lux, as shown in FIG. 4, the time required to reach 0.32 mcd / m ² is
Approximately 2,000 minutes or more for phosphorescent material A and about 2 for phosphorescent material B
00 minutes.

Therefore, comparing the phosphorescent materials A and B, the phosphorescent material A is about 10 times brighter than the phosphorescent material B, and the afterglow can be visually recognized for a long time.

Then, a visible light emitting phosphor, for example, a phosphor for emitting light in the three-wavelength region is deposited on substantially the entire inner peripheral surface of the first layer 5 to form a second layer 6. The film thickness of the second layer 6 is 10 to 30 μm.

The following Table 2 shows changes in the total luminous flux at the time of lighting, the afterglow luminance at the time of extinguishing, and the average color rendering index when the film thicknesses of the first and second layers 5 and 6 are variously changed. In the table, ⊚ indicates a state where the afterglow luminance is very high, and hereinafter, ∘ indicates high, Δ indicates middle, and x indicates no afterglow luminance.

[0032]

[Table 2]

Therefore, according to the present embodiment, even if the fluorescent lamp 1 being turned on goes out due to a power failure or the like, the general white fluorescent light is generated immediately after the turning off by the afterglow of the afterglow phosphor of the fluorescent lamp 1. It is possible to maintain the brightness for a predetermined time with a luminous flux of more than the lamp.

For this reason, since people and objects can be visually recognized in the afterglow even after the lights are turned off, night lights are not required, and people can move safely, which is confusing even during emergency evacuation. Guidance is possible without doing so, and safety can be improved.

By the way, when the first layer 5 is formed of only the strontium aluminate phosphor, the strontium aluminate phosphor emits light strongly, and even a slight change in the film thickness affects the color of light emitted from the lamp. However, precision is required for film thickness management. For this reason, it takes a lot of time and time to match the lamp colors, and there remains a problem in mass productivity.

Therefore, in the second embodiment of the present invention, the first layer 5 is formed by mixing a strontium aluminate phosphor with a visible light emitting type phosphor, for example, a three wavelength region emitting type phosphor. The mixing amount of strontium aluminate is 20
To 80% by weight.

Table 3 shows the first layer 5 when the mixing ratio (% by weight) of strontium aluminate in the first layer 5 was variously changed.
Changes in film thickness, total luminous flux, afterglow brightness, and average color rendering index of the second layers 5 and 6 are shown. In Table 3, ◎, ○, △, and × marks represent the same states as in Table 1.

[0038]

[Table 3]

Therefore, according to this second embodiment,
Since the first layer 5 is formed by mixing strontium aluminate with a three-wavelength band emission type phosphor, the afterglow previously adjusted to the target chromaticity is formed on the inner surface of the bulb 2 or a protective film (not shown). By applying a strong strontium aluminate phosphor and a phosphor for three wavelengths to form the first layer 5, there is a margin in the film thickness control width of the first layer 5 and it is easy to perform color matching. It is possible to improve the sex. Further, the total luminous flux can be improved.

In each of the above embodiments, the case where the valve 2 is a straight tube has been described, but the present invention is also applicable to a ring valve 2a shown in FIG. 3 and a bent valve in which the straight tube valve 2 is bent into a required shape. can do.

FIG. 5 is a perspective view of a lighting fixture according to a third embodiment of the present invention. The lighting fixture 7 has a fixture body 8 thereof.
In addition, for example, a plurality of holders 9 for detachably holding the fluorescent lamp 1A, which is a ring-shaped fluorescent lamp 1 as shown in FIG. The fluorescent lamp 1 is turned on or off by pulling it down. In addition, in FIG.
Reference numeral 12 is a shade.

[0042]

As described above, according to the invention of claim 1 of the present application, the first layer is formed of strontium aluminate having afterglow property on the inner peripheral surface side of the airtight container such as a glass bulb. Therefore, even after the fluorescent lamp is turned off, the afterglow of the afterglow phosphor at the time of lighting can provide illumination for a while. Therefore, even if a sudden power failure occurs,
Since it is possible to take some measures such as emergency evacuation during afterglow, it is possible to improve safety.

According to a second aspect of the invention, on the inner peripheral surface of the airtight container,
Alternatively, a first layer is formed on the protective film by mixing a strontium aluminate phosphor having a strong afterglow property and a visible-light-emitting phosphor that have been adjusted to a target chromaticity in advance, and then a visible light is formed on the first layer. Since the second layer made of the light-emitting phosphor is formed, color matching can be easily performed without strictly setting the film thickness, and mass productivity can be improved.

Since each of the inventions of claims 3 to 7 also comprises the afterglow phosphor of claim 1 or 2, it has substantially the same effect as the invention of claim 1 or 2. it can.

Since the invention of claim 8 has the fluorescent lamp according to any one of claims 1 to 7, it has substantially the same operational effect as the invention of claims 1 to 7.

[Brief description of drawings]

FIG. 1 is an end view of a section taken along line I-I of FIG.

FIG. 2 is a front view of the fluorescent lamp according to the first embodiment of the present invention.

FIG. 3 is a front view of an annular valve.

FIG. 4 is a characteristic diagram showing the afterglow time and brightness of the phosphorescent materials A and B according to the present invention.

FIG. 5 is a perspective view of a lighting fixture according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Fluorescent Lamp 2 Bulbs 3a, 3b Pair of Electrodes 4a, 4b Pair of Bases 5 First Layer of Phosphor 6 Second Layer of Phosphor 7 Lighting Fixture

Claims (8)

[Claims] 1. An airtight container containing a discharge medium; a discharge generating means for generating an electric discharge in the airtight container; and a strontium aluminate phosphor having afterglow property formed on the inner peripheral surface side of the airtight container. A fluorescent lamp comprising: a first layer; and a second layer formed by forming a visible light emitting phosphor on the inner peripheral surface of the first layer. 2. An airtight container containing a discharge medium; a discharge generating means for generating an electric discharge in the airtight container; a first phosphor formed by mixing a strontium aluminate phosphor with a visible light emitting phosphor. And a second layer formed by forming a visible light emitting phosphor on the inner peripheral surface of the first layer. 3. The fluorescent lamp according to claim 1, wherein the amount of the strontium aluminate phosphor in the first layer mixed is 20 to 80% by weight. 4. The fluorescent lamp according to claim 1, wherein the visible light emitting phosphor is a three-wavelength region emitting phosphor. 5. The fluorescent lamp according to claim 1, wherein the strontium aluminate phosphor has an average primary particle size of 3 to 15 μm. 6. The fluorescent lamp according to claim 1, wherein the film thickness of the first layer is 5 to 50 μm. 7. The fluorescent lamp according to claim 1, wherein the film thickness of the second layer is 10 to 30 μm. 8. A lighting fixture comprising: the fluorescent lamp according to claim 1; and a fixture body that supports the fluorescent lamp.