JP2004220984A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of suppressing shortening of the life which is caused by degradation in light emission efficiency or intensity of ultraviolet ray, or caused by rapid consumption of mercury. <P>SOLUTION: A phosphor emission layer 2 that emits ultraviolet ray is formed on the inner wall of a glass tube 1 in which rare gas and mercury vapor 3 is sealed up. The phosphor emission layer 2 comprises silicate group such as active barium silicate with lead, strontium, magnesium phosphor, active barium silicate phosphor with lead, active zinc silicate phosphor with manganese, or the like. The phosphor of silicate group is mixed with antimony trioxide by 0.25-1.00 wt.%. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluorescent lamp, and more particularly, to a fluorescent lamp that emits ultraviolet light.
[0002]
[Prior art]
The fluorescent lamp has a simple structure in which mercury, a rare gas such as argon and xenon are sealed in a glass tube having a phosphor luminescent layer formed inside, and has a simple structure in which electrodes are provided at both ends of the glass tube. Since it is obtained, it is widely used in various fields.
[0003]
As the phosphor, a lead-activated barium silicate, strontium, magnesium phosphor {(Ba, Sr, Mg) ₃ Si ₂ O ₇ : Pb} phosphor, a lead-activated barium silicate {BaSi ₂ O ₅ : Pb} phosphor Alternatively, a silicate phosphor such as a manganese-activated zinc silicate phosphor that emits green light can be used.
[0004]
However, conventionally, there has been known a problem that a fluorescent lamp using a fluorescent material that emits ultraviolet light has a lower maintenance rate than a fluorescent lamp for general illumination, and a short usage time of efficient ultraviolet irradiation.
[0005]
This is because conventional silicate phosphors readily absorb mercury, which causes a decrease in luminous efficiency and ultraviolet intensity and a short life due to rapid consumption of mercury.
[0006]
For this purpose, various measures have conventionally been proposed. For example, JP-A-11-111228 discloses that a lead-activated barium silicate phosphor is coated with a protective film made of yttrium oxide (Y ₂ O ₃ ) to prevent adsorption of mercury and suppress consumption of mercury. A fluorescent lamp is disclosed.
[0007]
[Patent Document 1]
JP-A-11-111228
[Problems to be solved by the invention]
However, even if such a conventional protective film is used, no measures have been taken for the composition of the phosphor itself, so it is difficult to sufficiently suppress the reduction in luminous efficiency and ultraviolet intensity, and the short life due to rapid consumption of mercury. is there.
[0009]
Furthermore, in this prior art, since the use of a protective film is an essential condition, the productivity is reduced accordingly.
[0010]
Therefore, an object of the present invention is to provide a fluorescent lamp which can sufficiently suppress a decrease in luminous efficiency and ultraviolet intensity and a short life due to rapid consumption of mercury without using a protective film on a silicate phosphor. That is.
[0011]
[Means for Solving the Problems]
A feature of the present invention is a fluorescent lamp in which a phosphor light emitting layer for emitting ultraviolet light is formed on the inner wall of a glass tube, wherein the phosphor light emitting layer is made of silicates mixed with antimony trioxide (Sb ₂ O ₃ ). In a fluorescent lamp composed of a body.
[0012]
Here, the weight percentage of the antimony trioxide mixed therein with respect to the weight of the silicate phosphor is 0.25 wt% to 1.00 wt% (0.25 wt% or more and 1.00 wt% or less). It is preferable that
[0013]
Further, as the phosphor of the silicates, a lead activated barium silicate, strontium, magnesium {(Ba, Sr, Mg) ₃ Si ₂ O ₇ : Pb} phosphor can be used.
[0014]
Alternatively, a lead-activated barium silicate {BaSi ₂ O ₅ : Pb} phosphor can be used as the silicate phosphor.
[0015]
Alternatively, a manganese-activated zinc silicate phosphor can be used as the silicate phosphor.
[0016]
Furthermore, it is preferable to form 3 mg to 5 mg of a silicate phosphor mixed with the antimony trioxide per 1 cm ² of the inner wall of the glass tube.
[0017]
In addition, electrodes are provided at both ends in the longitudinal direction of the glass tube, and a cross section of the glass tube in a direction perpendicular to the longitudinal direction can be a circular ring. In this case, the inside diameter of the glass tube is preferably 15 mm to 38 mm.
[0018]
Alternatively, electrodes may be provided at both ends in the longitudinal direction of the glass tube, and a cross section of the glass tube in a direction perpendicular to the longitudinal direction may be a rectangular ring shape.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described below with reference to the drawings.
[0020]
FIG. 1 is a diagram showing a first embodiment of the present invention, and is a cross-sectional view in a direction perpendicular to a longitudinal direction of a glass tube.
[0021]
Mercury vapor and a rare gas 3 such as argon or xenon are sealed in a circular glass tube 1 having an inner diameter of 15 mm to 38 mm and provided with electrodes at both ends in the longitudinal direction, and a phosphor that emits ultraviolet light on the inner wall of the glass tube 1 The light emitting layer 2 is formed.
[0022]
The phosphor light emitting layer 2 is made of a silicate phosphor such as a lead-activated barium silicate, strontium, or magnesium phosphor, a lead-activated barium silicate phosphor, or a manganese-activated zinc silicate phosphor.
[0023]
Further, antimony trioxide (Sb ₂ O ₃ ) is mixed in the silicate phosphor constituting the phosphor phosphor layer 2.
[0024]
The mixing ratio is such that the weight percentage of the antimony trioxide mixed therein is 0.25 wt% to 1.00 wt% (0.25 wt% or more and 1.00 wt% or less) with respect to the weight of the silicate phosphor. ).
[0025]
The phosphor luminescent layer 2 of silicates mixed with antimony trioxide is formed in an amount of 3 mg to 5 mg per 1 cm ² of the inner wall of the glass tube 1.
[0026]
Such a phosphor luminescent layer 2 made of silicate mixed with antimony trioxide is used to prepare 0.25 wt% to 1.00 wt% of antimony trioxide powder with respect to the weight of the phosphor when preparing the phosphor coating solution. Can be formed.
[0027]
FIG. 2 shows a case where, in the fluorescent lamp of FIG. 1, lead-activated barium silicate, strontium, and magnesium phosphors are used as the phosphor light-emitting layer 2 and 0.25 wt% of antimony trioxide is mixed therein (graph A). UV (ultraviolet rays) when 0.50 wt% of antimony oxide is mixed (Graph B), when 1.00 wt% of antimony trioxide is mixed (Graph C), and when antimony trioxide is not mixed (Graph D) 4) Experimental data showing the relationship between output (vertical axis) and usage time (horizontal axis). Here, the initial value (at the start of use) is shown as 100% in each data.
[0028]
According to this, when antimony trioxide is not mixed (Graph D), the decrease in UV output becomes largest after the use time elapses.
[0029]
However, when antimony trioxide is mixed at 0.25 wt% (graph A), the decrease in UV output is minimized.
[0030]
When the mixing ratio of antimony trioxide was increased to 0.50 wt% and 1.00 wt%, the decrease in UV output gradually increased, and when the mixing ratio was 1.00 wt%, antimony trioxide was mixed. It is appropriate to set the upper limit of the mixing ratio to 1.00 wt% because the effect is limited. Therefore, the weight percentage of antimony trioxide mixed with the weight of the silicate phosphor is 0.25 wt% to 1.00 wt% (0.25 wt% or more and 1.00 wt% or less). Is preferred.
[0031]
As described above, the ratio of maintaining the ultraviolet output can be improved by mixing antimony trioxide, but the initial ultraviolet output decreases as the mixing amount increases. According to the experimental data, assuming that the initial UV output without mixing antimony trioxide is 100%, the initial UV output increases as the mixing amount increases to 0.25 wt%, 0.50 wt%, and 1.00 wt%. Is reduced to 97%, 93%, and 90% as compared with the case where antimony trioxide is not mixed. When more than 1.00 wt% of antimony trioxide is mixed, the case where antimony trioxide is not mixed is obtained. Since the UV initial output is less than 90%, the upper limit of the mixing ratio of antimony trioxide is preferably 1.00 wt% from this point as well.
[0032]
Here, in FIG. 2 and the above-described experiment regarding the initial ultraviolet output, the ultraviolet output value near 360 nm in the spectral distribution was measured by an ultraviolet intensity meter. FIG. 3 shows the relationship between the wavelength and the radiation intensity.
[0033]
The above is an example of experimental data when a lead-activated barium silicate, strontium, or magnesium phosphor is used as the phosphor light-emitting layer 2. The lead-activated barium silicate phosphor or manganese is used as the phosphor light-emitting layer 2. Similar results were obtained with the activated zinc silicate phosphor.
[0034]
FIG. 4 is a view showing a second embodiment of the present invention, and is a cross-sectional view in a direction perpendicular to the longitudinal direction of the glass tube.
[0035]
This embodiment is a flat ultraviolet lamp in which electrodes are provided at both ends in the longitudinal direction, and the cross section of the glass tube 10 in a direction perpendicular to the longitudinal direction is a rectangular ring shape.
[0036]
As in the first embodiment, a mercury vapor and a rare gas 3 such as argon or xenon are sealed in a glass tube 10, and a phosphor light emitting layer 20 for emitting ultraviolet light is formed on the inner wall of the glass tube 1. I have.
[0037]
The phosphor emitting layer 20 is also made of a lead-activated barium silicate, strontium, magnesium phosphor, a lead-activated barium silicate phosphor, or a manganese-activated zinc silicate phosphor mixed with antimony trioxide (Sb ₂ O ₃ ). It is composed of a silicate phosphor such as a body.
[0038]
Further, antimony trioxide (Sb ₂ O ₃ ) is mixed in the silicate phosphor constituting the phosphor phosphor layer 20.
[0039]
The mixing ratio is such that the weight percentage of the antimony trioxide mixed therewith is 0.25 wt% to 1.00 wt% (0.25 wt% or more and 1.00 wt% or less) based on the weight of the silicate phosphor. ).
[0040]
The phosphor luminescent layer 20 of silicates mixed with antimony trioxide is formed in an amount of 3 mg to 5 mg per 1 cm ² of the inner wall of the glass tube 10.
[0041]
Therefore, the same effects as in the first embodiment can be obtained in the second embodiment.
[0042]
【The invention's effect】
As described above, the conventional silicate phosphors easily absorb mercury, thereby decreasing the luminous efficiency and ultraviolet intensity and causing a short life due to rapid consumption of mercury. However, in the present invention, a phosphor film is formed. By adding antimony trioxide to the phosphor, mercury adsorption of the silicate to the phosphor is suppressed, and the maintenance rate of the ultraviolet intensity of the lamp and the life of the lamp can be improved.
[Brief description of the drawings]
FIG. 1 is a view showing a first embodiment of the present invention, and is a cross-sectional view in a direction perpendicular to a longitudinal direction of a glass tube.
FIG. 2 is a diagram showing an ultraviolet output maintenance ratio.
FIG. 3 is a diagram showing a spectral distribution which is a relationship between a wavelength and a radiation intensity.
FIG. 4 is a view showing a second embodiment of the present invention, and is a cross-sectional view in a direction perpendicular to the longitudinal direction of the glass tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Glass tube 2 Phosphor light emitting layer 3 Rare gas, mercury vapor 10 Glass tube 20 Phosphor light emitting layer

Claims (9)

In a fluorescent lamp having a phosphor light emitting layer for emitting ultraviolet light on an inner wall of a glass tube, the phosphor light emitting layer is a light emitting layer of a silicate phosphor mixed with antimony trioxide. lamp. 2. The fluorescent lamp according to claim 1, wherein a weight percentage of the antimony trioxide mixed with the silicate phosphor is 0.25 wt% to 1.00 wt%. 3. 3. The fluorescent lamp according to claim 1, wherein the silicate phosphor is a lead-activated barium silicate, strontium, or magnesium phosphor. 3. The fluorescent lamp according to claim 1, wherein the silicate phosphor is a lead-activated barium silicate phosphor. The fluorescent lamp according to claim 1, wherein the silicate phosphor is a manganese-activated zinc silicate phosphor. 6. The fluorescent lamp according to claim 1, wherein 3 mg to 5 mg of a silicate phosphor mixed with the antimony trioxide is formed per 1 cm ² of the inner wall of the glass tube. 7. 7. An electrode is provided at each of both ends in the longitudinal direction of the glass tube, and a cross section of the glass tube in a direction perpendicular to the longitudinal direction has a circular ring shape. The fluorescent lamp according to 1. The fluorescent lamp according to claim 7, wherein an inner diameter of the glass tube is 15 mm to 38 mm. 7. An electrode is provided at each of both ends in the longitudinal direction of the glass tube, and a cross section of the glass tube in a direction perpendicular to the longitudinal direction has a rectangular ring shape. The fluorescent lamp according to 1.

Images