JP2001319619A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp with increased total luminous flux and rate of flux preservation and with suppressed life shortening while reducing enclosed quantity of mercury by suppression of blackening caused by Na component in glass together with reduction of softening temperature of the glass bulb. SOLUTION: The fluorescent lamp 10 possesses a glass bulb 1 enclosing discharge gas, a phosphor layer 2 formed on an inner wall of the glass bulb 1, and stem portions 4, 4 with electrodes 3, 3. The lamp 10 is bent in a single ring after the phosphor layer was formed, and the glass bulb is made of a glass that contains Na2O of 1 to 11 mass %, K2O of 0.1 to 10 mass %, Li2O of 0 to 3 mass % (where the total sum of Na2O, K2O and Li2O is in a range of 5 to 20 mass %), Sb2O3 of 0.1 to 0.5 mass %, and substantially no lead, and its softening temperature is lower than 685 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped fluorescent lamp, a compact fluorescent lamp or a fluorescent lamp formed by forming a phosphor layer on the inner surface of a glass bulb and then bending the formed fluorescent layer.

[0002]

2. Description of the Related Art Fluorescent lamps include general lighting,
Recently, it is widely used as a light source for office automation equipment, a pixel light source for a huge screen, and the like. In addition, three-wavelength fluorescent lamps have been remarkably popular in recent years because they satisfy both high efficiency and high color rendering properties for general illumination. In such a fluorescent lamp, a mixed gas containing mercury and a rare gas is sealed as a discharge gas in a glass bulb provided with a phosphor layer on an inner wall surface, and a positive column discharge is generated in the mixed gas. It is what was constituted.

[0003] Among the fluorescent lamps described above, for example, a ring-shaped fluorescent lamp is manufactured as follows. That is, first, a phosphor is applied to the inner surface of a straight tube-shaped glass bulb (glass tube) to form a phosphor layer, and then stem portions having electrodes at both ends of the glass bulb are sealed. Next, the glass bulb is bent into a desired ring shape while heating the glass bulb, and then the inside of the bulb is exhausted to sufficiently reduce the pressure inside. Thereafter, an appropriate amount of mercury is charged together with the rare gas into the glass bulb, and the exhaust pipe is sealed to obtain a desired annular fluorescent lamp.

Heretofore, lead glass containing about 20 to 30% by mass of lead oxide (PbO) has been mainly used for the glass bulb, but harmful lead (PbO) is considered in consideration of environmental problems and the like. ) Soda-lime glass substantially free of components has been used. Soda lime glass is usually about 15 to 17% by mass of sodium oxide (N
a ₂ O).

[0005] The softening temperature of the above-mentioned conventional soda-lime glass is around 690 ° C. When manufacturing a ring-shaped fluorescent lamp using a glass bulb made of such a soda-lime glass, it is necessary to heat the glass bulb on which the phosphor layer is formed to a temperature higher than the softening temperature of the soda-lime glass. . Here, it is known that when a glass bulb is heated and bent, the phosphor layer formed therein is thermally degraded. The higher the heating temperature, the more severe the thermal degradation. Soda-lime glass, whose temperature is higher than lead-based glass, will have even more adverse effects on the phosphor layer.

[0006]

As described above, a ring-shaped fluorescent lamp using a glass bulb made of soda-lime glass suffers from severe thermal degradation of the phosphor layer as compared with a case using lead-based glass. Tend to be lower. Further, conventional soda-lime glass is 15-17.
Since the glass contains a relatively large amount of sodium (Na) as much as about% by mass, Na in the glass reacts with mercury that has entered the glass bulb, causing the fluorescent lamp to be colored black-brown. . Further, the Na component precipitated on the inner surface of the bulb and the mercury react with each other to generate a mercury compound, which may be a factor of lowering the luminous flux maintenance factor. It has been found that the coloring of the fluorescent lamp by the Na component is more conspicuous as the number of heating steps in processing the glass bulb increases.
It is considered that this is because a large amount of Na component is precipitated on the inner surface of the bulb and penetrates into the phosphor layer in the heating step of the glass bulb.

[0007] For this reason, the use of a glass bulb made of glass whose softening temperature has been lowered substantially without containing any harmful lead (Pb) component can suppress the reduction of the total luminous flux of the fluorescent lamp. Is strongly required.
Further, from the viewpoint of the luminous flux maintenance rate of the fluorescent lamp, a glass bulb having a low content of a Na component causing coloring is required. Such demands are not limited to ring-shaped fluorescent lamps,
It is required for all fluorescent lamps that require heat treatment to a temperature near the softening point after forming a phosphor layer on the inner surface of a glass bulb.

On the other hand, in the reaction between the Na component and mercury, the amount of mercury required in the bulb decreases due to the conversion of mercury, which should emit ultraviolet rays by discharge, into a mercury compound, resulting in a shorter life due to depletion of mercury. There is also a risk. Therefore, extra mercury is sealed in the glass bulb made of soda-lime glass so that mercury is not depleted. In general, taking into account the variation in encapsulation of mercury, about 10 mg or more (0.02 to 0.03 mg / cm ³ per unit volume).
Above) was enclosed.

However, since mercury is a substance that affects the surrounding environment, the amount of mercury used in the lamp must be reduced as much as possible.

Japanese Patent Application Laid-Open No. 10-324540 describes a glass composition for a tube stem for an illumination light source, and uses Li ₂ O or K ₂ O as a flux together with Na ₂ O. It is disclosed that the melting property of the glass was improved. However, this glass composition is intended to be used for a stem portion for sealing a lead wire to a fluorescent lamp or an incandescent lamp, and to be used for a glass bulb serving as a light emitting portion,
No consideration is given to bending the glass composition or reacting the Na component with mercury.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems. In a fluorescent lamp that is bent after a phosphor layer is formed on the inner surface of a glass bulb, the softening temperature of the glass bulb is reduced and the glass is softened. The object of the present invention is to provide a fluorescent lamp which aims to increase the total luminous flux and the luminous flux maintenance rate by suppressing the blackening caused by the Na component in the inside, to suppress the shortening of the service life while reducing the amount of enclosed mercury. And

[0012]

According to a first aspect of the present invention, there is provided a fluorescent lamp including a glass bulb filled with a discharge gas, a phosphor layer formed on an inner surface of the glass bulb, and both ends of the glass bulb. , comprising a stem portion having an electrode, in a fluorescent lamp made form songs monocyclic after forming the phosphor layer on the inner surface of the glass bulb, the glass bulb is 1 to 11 mass% of Na ₂ O, 1 to 10 wt% of K ₂ O, 0 to 3 wt% of Li ₂ O (provided that, Na ₂
O, 5 to 20 wt% as the total amount of K ₂ O and Li ₂ O
), Glass having a composition containing 0.1 to 0.5% by mass of Sb ₂ O ₃ , containing substantially no lead, and having a softening temperature of 685 ° C. or less. I do.

The above-mentioned glass using K ₂ O and Li ₂ O together with Na ₂ O as a flux has a composition substantially free of lead and has a softening temperature of 6 times as compared with conventional soda-lime glass.
It can be lowered to 85 ° C. or less. By applying such a low softening point glass to a glass bulb,
The heating temperature at the time of bending can be reduced, and based on the decrease in the heating temperature, it is possible to suppress the thermal deterioration of the phosphor layer and, consequently, the decrease in the total luminous flux. Further, Na ₂ O
By controlling the amount to 11% by mass or less, it becomes possible to suppress coloring caused by the Na component in the glass and, consequently, decrease in the luminous flux maintenance factor.

Here, the softening temperature is defined as the viscosity η of glass.
This is the temperature at which 10 ^7.65 dPa · s is reached.

[0015] The glass bulb, while minimizing the heating step of Na component is likely to precipitate since only bent in monocyclic, Na ₂ O with decreasing the heating temperature during the song adult
By setting the amount to 11% by mass or less, the precipitation amount of the Na component is minimized, and the penetration of the Na component into the phosphor layer is suppressed. For example, if the glass bulb has a double ring shape, it is necessary to first heat and bend two single-tube bulbs and then reheat them to connect these single-tube bulbs and connect them by blow-off processing. There is. As described above, the fluorescent lamp, which has to undergo a plurality of heating steps for processing the glass bulb, easily precipitates the Na component even if the amount of Na ₂ O in the glass bulb is reduced, so that it enters the phosphor film. Therefore, there is a possibility that the desired total luminous flux and luminous flux maintenance ratio cannot be achieved.

Sb ₂ O ₃ is an essential component for applying an oxidizing and refining (oxidizing and melting) method when producing a glass tube, and this can further increase the total luminous flux.

According to the first aspect of the invention, the amount of Na ₂ O is 1
A glass bulb having a softening temperature of 185% or less and having a softening temperature of 685 ° C. or less is bent into a single ring, thereby minimizing a heating step in which Na components are likely to precipitate and minimizing the amount of Na components deposited to minimize the fluorescent lamp. , The total luminous flux and the luminous flux maintenance factor can be increased.

A second aspect of the present invention is the fluorescent lamp according to the first aspect, wherein a lamp current per unit sectional area of the glass bulb is 200 mA / cm ² or more.

Here, the cross-sectional area of the glass bulb means the cross-sectional area of the space inside the bulb in a direction perpendicular to the longitudinal direction of the bulb. The lamp current is a current input to the fluorescent lamp and does not include the power consumed by the lighting circuit.

In the case where the lighting state of the fluorescent lamp is variable, it is defined by the maximum lamp current in a lighting controllable range such as a high output lighting state. Therefore,
It does not include the lamp current value at the end of life or in the abnormal lighting state.

The lamp current per unit sectional area of the glass bulb (hereinafter referred to as "lamp current density") is 200 m.
If it is A / cm ² or more, a large amount of mercury in the glass bulb is driven into the bulb, and reacts with the Na component in the bulb to easily reduce the transmittance of the bulb. It has been confirmed that this phenomenon is remarkably exhibited in a fluorescent lamp which is bent after forming a phosphor layer on a glass bulb. This is presumably because the phosphor layer partially cracks when the glass bulb is bent, and mercury enters the glass bulb from the cracked portion.

Therefore, when the fluorescent lamp according to claim 1 is operated under the condition of a lamp current density of 200 mA / cm ² or more, a decrease in the transmittance of the bulb due to the reaction between mercury and the Na component is suppressed, and the luminous flux maintenance factor is reduced. Improved.

The above is the lamp current density of 200 mA / cm ²
In the above case, the description is based on the phenomenon that mercury is driven into the glass bulb. In addition to this phenomenon, when the lamp current density is 200 mA / cm ² or more, the amount of ultraviolet rays having a wavelength of 185 nm out of the ultraviolet rays emitted by the excitation of mercury atoms increases. It is also conceivable that the Na component precipitated on the inner surface of the glass bulb and the mercury react with each other to reduce the transmittance because the component is easily precipitated.

The lamp current density is 200 mA / cm.
^If it is less than ² , the decrease in the luminous flux maintenance ratio did not cause much problem, because the amount of mercury injected into the bulb was small.

According to the second aspect of the present invention, the fluorescent lamp of the first aspect is operated under the condition that the lamp current density is 200 mA / cm ² or more. Since the Na component that reacts with mercury is equal to or less than a certain amount, a decrease in the transmittance of the bulb is suppressed, and the luminous flux maintenance factor of the fluorescent lamp can be improved.

A third aspect of the present invention is the fluorescent lamp according to the first or second aspect, wherein the glass bulb is bent into a single ring, and then the glass bulb is exhausted by utilizing residual heat at the time of bending.

According to the third aspect of the present invention, since the inside of the valve is evacuated by utilizing the residual heat at the time of bending, a separate heating step for exhaust is not required. Precipitation of components can be suppressed.

[0028] In the fluorescent lamp according to claim 4, the discharge gas is sealed.
Glass bulb and the inner surface of the glass bulb
Phosphor layer and electrodes provided at both ends of the glass bulb
An inner surface of the glass bulb.
Fluorescent lamp formed after forming the phosphor layer on
In the above, the glass bulb comprises 1 to 11% by mass of Na.
_TwoO, 1 to 10 mass% K_TwoO, 0-3 mass% Li_TwoO
(However, Na_TwoO, K _TwoO and Li_TwoThe total amount of O
In the range of 5 to 20% by mass), 0.1 to 0.5% by mass of S
b_TwoO_ThreeAnd containing substantially no lead
Both are made of glass having a softening temperature of 685 ° C. or less,
In addition, the amount of mercury enclosed in the glass bulb is the volume inside the bulb
0.003-0.016 mg / cm^ThreeBeing
It is characterized by.

Here, the bulb internal volume means the volume of the entire space including the discharge region formed between the pair of electrodes and the non-discharge region where no discharge occurs, which is the space inside the glass bulb.

According to the fourth aspect of the present invention, the amount of mercury in a glass bulb whose Na ₂ O content is 1 to 11% by mass and whose softening temperature is 685 ° C. or less is constant with respect to the internal volume of the bulb. Therefore, the precipitation amount of Na component is minimized, the consumption of mercury during lamp operation is suppressed, and even if the amount of enclosed mercury is reduced, the lamp can be lit in a desired state until the rated life. it can.

Here, the amount of mercury enclosed is 0.003 mg / c.
If it is less than m ³ , Na slightly precipitated on the valve surface
This is not possible because mercury is consumed by the reaction with the components and the amount of mercury required for normal light output is insufficient during the rated life and becomes excessively dark (dark spot).

The amount of mercury enclosed is 0.016 mg / cm
^If it exceeds ³ , the amount of surplus mercury increases, and the purpose of reducing the amount of enclosed mercury, which is to suppress the amount of mercury used per fluorescent lamp to 10 mg or less, cannot be achieved.
That is, F is the largest dimension of a general-purpose annular fluorescent lamp.
When the bulb volume of the CL40 type is about 610 cm ³ , and the amount of mercury sealed in this lamp is 10 mg or less, it is about 0.1 mg.
Since the amount is not more than 0164 mg / cm ³ , it is necessary that other curved fluorescent lamps be within the above range.

As a means for accurately enclosing such a small amount of mercury in a lamp, a method of enclosing the mercury in a solid form of a mercury alloy or a method in which the glass capsule is held in a mount in a glass capsule, and the glass capsule is cracked after exhaustion is performed. Is used.

In the case of the straight tube type fluorescent lamp, the consumption of mercury on the inner surface of the glass can be suppressed to some extent by the phosphor and the protective film. However, after forming the protective film and the phosphor layer such as a ring type fluorescent lamp, the mercury is formed. In the case of a fluorescent lamp to be processed, a gap is formed in the phosphor layer or the protective film in a crack-like manner because the glass tube is bent while being stretched, and the inner surface of the glass is exposed. Mercury consumption in the market is likely to increase. Therefore, the invention of claim 3 has a remarkable effect on the fluorescent lamp subjected to the bending process.

According to a fifth aspect of the present invention, in the fluorescent lamp according to any one of the first to fourth aspects, the glass constituting the glass bulb contains 60 to 75% by mass of SiO _{2 and} 1 to 5% by mass of Al ₂ O _3. , Na ₂ O is 1 to 11% by mass, K ₂ O is 1 to
10% by mass, 0 to 3% by mass of Li ₂ O, Na ₂ O + K ₂ O
+ Li ₂ O is 5 to 20% by mass, CaO is 0 to 3% by mass,
0 to 2% by mass of MgO, 1 to 10% by mass of BaO, Sr
O is 0.5 to 10% by mass, CaO + MgO + BaO + S
rO is 4.5 to 16 wt%, B ₂ O ₃ is 0-3 wt%, Z
nO is 0 to 3 wt%, Sb ₂ O ₃ is 0.1 to 0.5 mass%
Characterized by having the following composition:

According to a sixth aspect of the present invention, in the fluorescent lamp according to any one of the first to fourth aspects, the glass constituting the glass bulb contains 60 to 75% by mass of SiO _{2 and} 1 to 5% by mass of Al ₂ O _3. , Na ₂ O is 1 to 11% by mass, K ₂ O is 1 to
10% by mass, 0 to 3% by mass of Li ₂ O, Na ₂ O + K ₂ O
+ Li ₂ O is 5 to 20% by mass, CaO is 2 to 5% by mass,
MgO is 1 to 3% by mass, BaO is 1 to 10% by mass, Sr
O is 0.5 to 10% by mass, CaO + MgO + BaO + S
rO is 4.5 to 17% by mass, B ₂ O ₃ is 0 to 3% by mass, Z
nO is 0 to 3 wt%, Sb ₂ O ₃ is 0.1 to 0.5 mass%, Fe ₂ O ₃ is characterized by having a composition of 0.01 to 0.05 wt%.

The glass composition described in claim 5 or 6 is more preferable in view of lowering the softening temperature of the glass bulb, adjusting the coefficient of thermal expansion, improving electrical insulation, and preventing distortion.

According to the fifth or sixth aspect of the present invention, since the glass composition is set within a specific range, the glass composition is set to a softening temperature, a processing temperature, and a physical property within a practical range for mass production of glass tubes and lamps. can do.

According to a seventh aspect, in the fluorescent lamp according to any one of the first to sixth aspects, the phosphor layer has a wavelength of 43 nm.
0 to 460 nm, wavelength 540 to 550 nm, and wavelength 6
It is characterized by including a three-wavelength light-emitting phosphor having a main light emission peak in each range of 10 to 620 nm.

The fluorescent lamp of the present invention is particularly effective when a phosphor layer containing a three-wavelength light-emitting phosphor having a main emission peak in each wavelength range described in claim 7 is provided. In addition, by using a phosphor that consumes less mercury during lighting, it is possible to light for a longer time even with the same amount of mercury enclosed.

According to the seventh aspect of the present invention, it is possible to provide a fluorescent lamp including a phosphor layer including a three-wavelength phosphor having a main emission peak in each wavelength range.

According to an eighth aspect of the present invention, in the fluorescent lamp according to any one of the first to seventh aspects, the glass constituting the stem has the same composition as the glass constituting the glass bulb. .

Since the glass used for the bulb of the present invention also satisfies the characteristics required for the glass constituting the stem, it can be used for the glass constituting the stem together with the glass bulb. In this case, as described in claim 7, it is preferable to use a glass having the same composition as the glass constituting the glass bulb in the stem portion.

According to the eighth aspect of the invention, since the glass bulb and the stem have the same glass composition, the sealing of the stem is facilitated, and it is not necessary to separate the glass when recycling the fluorescent lamp. Reuse of the glass material is facilitated.

The luminaire of claim 9 is the lighting apparatus of claims 1 to 8
The fluorescent lamp according to any one of the above, a fixture main body that supports the fluorescent lamp, and a lighting device that is housed in the fixture main body and turns on the fluorescent lamp.

According to the ninth aspect of the present invention, it is possible to provide a lighting fixture including the fluorescent lamp according to any one of the first to eighth aspects.

[0047]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

FIG. 1 is a partially cutaway view showing the structure of the ring-shaped fluorescent lamp according to the first embodiment. In the figure,
1 is a pipe outer diameter of 29.5 mm, a wall thickness of 1.2 mm, and a pipe length of 590
It is a ring-shaped glass bulb of mm. This glass bulb 1
A phosphor layer 2 is formed on the inner surface of the substrate. further,
Mercury is sealed in the glass bulb 1 together with a discharge gas having a predetermined pressure, that is, a rare gas such as an argon gas. At both ends of the glass bulb 1, stems 4 having electrodes 3 are sealed, and these constitute a ring-shaped fluorescent lamp 10.

The phosphor constituting the phosphor layer 2 is not particularly limited, and various known phosphors can be used. In this embodiment, a blue region around 430 to 460 nm and a blue region around 540 to 550 nm are used. Green area and 610
This is particularly effective when a three-wavelength light emitting phosphor having a main light emission peak in a red region around ６620 nm is used.

As the three-wavelength light emitting phosphor, various known mixed phosphors can be used. For example, divalent europium-activated aluminate phosphor, divalent europium and manganese-activated aluminate phosphor Blue-to-blue-green light-emitting phosphors such as divalent europium-activated halophosphate phosphors, red light-emitting phosphors such as trivalent europium-activated yttrium oxide phosphors and trivalent europium-activated yttrium oxysulfide phosphors And a three-wavelength white light-emitting phosphor in which a rare-earth green light-emitting phosphor is appropriately mixed.

Next, a method of manufacturing the annular fluorescent lamp 10 of the present embodiment will be described.

First, a straight tube type glass bulb (glass tube)
By coating a phosphor coating solution in which, for example, a three-wavelength light emitting phosphor is dispersed in an organic solvent or an aqueous solvent together with a binder or the like, and baking the coated film at a temperature of, for example, 500 to 650 ° C. The phosphor layer 2 is formed. Then
The straight tube-shaped glass tube on which the phosphor layer 2 is formed is heated to 700 to 750 ° C. which is higher than the softening temperature of the glass constituting the tube.
Then, the glass tube 1 is obtained by winding the softened glass tube around a drum or the like and processing it into a single ring.

After the glass bulb 1 is bent, the residual heat at the time of bending is utilized (at a temperature of about 300 to 500 ° C.).
The inside of the glass bulb 1 is exhausted. As described above, since it is not necessary to heat the glass bulb 1 again for exhaust, the amount of the Na component precipitated from the glass bulb 1 can be suppressed.

After mercury and a desired rare gas have been sealed through this exhaust step, an exhaust pipe (not shown) provided at the end of the glass bulb 1 is sealed.

Glass bulb (glass tube) as described above
The ring-shaped glass bulb 1 formed by forming the phosphor layer 2 on the inner surface of Na ₂ O is 1 to 11% by mass.
Mass% of K ₂ O, 0 to 3 wt% of Li ₂ O (provided that, Na
₂ O, the range of 5 to 20 wt% as the total amount of K ₂ O and Li ₂ O), has a composition containing Sb ₂ O ₃ of 0.1 to 0.5 wt%, and a substantially lead It is made of glass not containing and having a softening temperature of 685 ° C. or lower (hereinafter referred to as low softening point alkali glass).

The low-softening point alkali glass using K ₂ O and Li ₂ O together with Na ₂ O as a flux has a composition substantially free of lead, and has a softening temperature of 685 ° C. as compared with conventional soda-lime glass. It can be reduced to the following. By using a glass bulb made of such a low softening point glass, the heating temperature at the time of bending can be reduced, and based on the decrease in the heating temperature, thermal degradation of the phosphor layer,
As a result, it is possible to suppress a decrease in the total luminous flux. Furthermore, since the amount of Na ₂ O can be reduced to 11% by mass or less, coloring due to the Na component in the glass and, consequently, a decrease in the luminous flux maintenance factor can be suppressed.

The glass constituting the ring-shaped glass bulb 1 is, more specifically, 60 to 75% by mass of SiO ₂ ,
l ₂ O ₃ is 1 to 5% by mass, Na ₂ O is 1 to 11% by mass, K ₂
O is 1 to 10 mass%, Li ₂ O 0 to 3 wt%, Na ₂ O
+ K ₂ O + Li ₂ O is from 5 to 20 wt%, CaO 0 to 3 wt%, MgO is 0-2 wt%, BaO 1 to 10 wt%, SrO 0.5 to 10 mass%, CaO + MgO + B
aO-+ SrO is from 4.5 to 16 wt%, B ₂ O ₃ 0 to 3 wt%, ZnO 0 to 3 wt%, Sb ₂ O ₃ is from 0.1 to 0.
It is preferable to use a glass composition having a composition of 5% by mass and a softening point of 650 to 685 ° C.

In the low softening point alkali glass having the above-mentioned glass composition, SiO ₂ is a network forming component of the glass, and its content is in the range of 60 to 75% by mass.
If the amount of SiO ₂ is less than 60% by mass, the chemical durability and the like of the glass decrease, while if it exceeds 75% by mass, the meltability and workability of the glass deteriorate.

Further, Al ₂ O ₃ contributes to homogenization of glass and improvement of chemical durability, and its content is set in a range of 1 to 5% by mass. When the amount of Al ₂ O ₃ is less than 1% by mass, phase separation occurs in the glass and molding becomes difficult. On the other hand, when the amount exceeds 5% by mass, striae and the like occur, making it difficult to obtain a homogeneous glass. Also, the devitrification may be increased.

Na ₂ O, K ₂ O and Li ₂ O act as fluxes and contribute to improving the melting property of glass and lowering the softening temperature. In particular, in the present invention, the amount of Na ₂ O at which the softening temperature rises is reduced to 11% by mass or less, and the contents of K ₂ O and Li ₂ O are increased accordingly. This makes it possible to lower the softening temperature of the glass used for the annular glass bulb 1 to 685 ° C. or lower.

In order to obtain the above-mentioned effects, it is preferable that K ₂ O and Li ₂ O be contained in a total amount of 4% by mass or more. The amount of K ₂ O is individually set to 1% by mass or more, and the amount of Li ₂ O is set in consideration of the amount of K ₂ O. Further, the total amount including the _{Na 2 O (Na 2 O +} K 2 O + Li 2 O) is 5 mass% or more. If the total amount of the flux is less than 5% by mass, the viscosity increases, the meltability decreases, and the softening temperature increases. Note that Na ₂ O is contained in an amount of 1% by mass or more to obtain a function as a flux.

Further, Na ₂ O, K ₂ O and Li
₂ O also has the effect of adjusting the coefficient of thermal expansion of glass, and in order to obtain an appropriate coefficient of thermal expansion, their total amount is 20% by mass.
The following is assumed. If the total amount of Na ₂ O, K ₂ O and Li ₂ O exceeds 20% by mass, the coefficient of thermal expansion becomes too high and the chemical durability decreases. Individually 11% by weight the amount of Na ₂ O is less, the amount of K ₂ O is 10 wt% or less, Li ₂
The amount of O is 3% by mass or less. If the amount of Na ₂ O exceeds 11% by mass, the softening point increases and the coefficient of thermal expansion becomes too high. Similarly, when the amounts of K ₂ O and Li ₂ O exceed the above upper limits, the coefficient of thermal expansion becomes too high.

The total amount of Na ₂ O, K ₂ O and Li ₂ O is more preferably in the range of 12 to 19% by mass. Regarding the content of each component, the amount of Na ₂ O is 6-1.
0 mass% of the range, the amount of K ₂ O is the range of 5-9 wt%, L
More preferably, the amount of i ₂ O is in the range of 1 to 2% by mass. By applying such a flux composition, it becomes possible to further lower the softening temperature of the glass.

BaO is a component for imparting high electrical insulation to glass, and its content is in the range of 1 to 10% by mass. If the amount of BaO is less than 1% by mass, sufficient electric insulation cannot be obtained. On the other hand, if it exceeds 10% by mass, erosion of the melting furnace material becomes remarkable, and defective spots increase. SrO is B
Like aO, it contributes to the improvement of electrical insulation, and its content is in the range of 0.5 to 10% by mass. If the amount of SrO is less than 0.5% by mass, sufficient electrical insulation cannot be obtained.
The devitrification tendency exceeding 0% by mass increases, and the raw material cost increases. More preferably, the amount of SrO is 8% by mass or less.

Although CaO and MgO contribute to improving the durability of the glass, the content of each of them is 3% by mass.
(CaO) If it exceeds 2% by mass (MgO), devitrification of the glass tends to occur. Therefore, their contents are respectively set to be equal to or less than the above upper limits.

The above-mentioned BaO, SrO, CaO and M
gO has the effect of increasing the electrical insulation of the glass as a whole, and the total amount (BaO + SrO + CaO + Mg)
O) is in the range of 4.5 to 16% by mass. If the total amount is less than 4.5% by mass, the electrical insulation required for the glass bulb 1 cannot be obtained, while if it exceeds 16% by mass, the tendency of glass to crystallize increases.

B ₂ O ₃ has an effect of improving the melting property with a small amount, but if its content exceeds 3% by mass, the chemical durability of the glass is reduced, and the surface may be weathered when used for a long time. There is. ZnO has an effect of suppressing volatilization when B ₂ O ₃ and alkali components are melted, but when its content exceeds 3% by mass, devitrification becomes strong.

Sb ₂ O ₃ is an essential component for applying the oxidative melting method when producing a glass tube used for the annular glass bulb 1, and its content is 0.1 to 0.5% by mass. %
Range. When the amount of Sb ₂ O ₃ is less than 0.1% by mass, the fining action becomes insufficient, while when the amount exceeds 0.5% by mass, the luminous flux maintenance ratio decreases.

It should be noted that Fe was added to the above glass composition._TwoO_ThreeContains
It is also possible to make it. In this case, Fe_TwoO_Three The glass
It is a component that is slightly contained in the raw material from the beginning,
It may be mixed for the purpose of adjusting the transmittance of glass.
And the content is in the range of 0.01 to 0.05% by mass.
Enclose. Fe_TwoO_ThreeIf the amount is less than 0.01% by mass,
The need for high-grade glass materials increases costs.
On the other hand, when the content exceeds 0.05% by mass, the glass becomes visible.
Light transmittance decreases.

By using the ring-shaped glass bulb 1 made of alkali glass having a low softening point having the above-described composition, thermal degradation of the phosphor layer due to a low softening temperature of 685 ° C. or less can be suppressed, and further, 11% by mass or less. Low N
In addition to realizing the suppression of coloring based on the amount of the component a, the thermal expansion coefficient can be adjusted, the electrical insulation can be improved, distortion can be prevented, and the reliability and characteristics of the annular fluorescent lamp 1 can be further improved. It becomes possible.

The low-softening point alkali glass having the above-described composition is suitable not only for the constituent material of the annular glass bulb 1 but also for the glass constituting the stem portion 4. In particular, since the stem portion 4 is made of glass having the same composition as the ring-shaped glass bulb 1, it is not necessary to separate the glass when recycling the ring-shaped fluorescent lamp 1, and it becomes easier to reuse the glass material.

The stem part 4 is heat-sealed to both ends after forming the phosphor layer 2 on the inner surface of a straight tube-shaped glass tube which becomes the ring-shaped glass bulb 1. The glass tube having the stem portion 4 sealed at both ends is heated to a temperature higher than its softening temperature, and after exhausting the inside impurity gas or the like sufficiently, the glass tube is wound around a drum or the like and processed into an annular shape. After this, the ring-shaped glass bulb 1
Inside, mercury is sealed together with a rare gas such as argon gas, and finally the exhaust pipe is sealed, whereby the intended annular fluorescent lamp 1 is obtained.

In the ring-shaped fluorescent lamp of the above-described embodiment, the thermal deterioration of the phosphor layer 2 can be suppressed based on the low softening point of the glass constituting the ring-shaped glass bulb 1, whereby the conventional soda-lime glass can be used. The total luminous flux can be improved as compared with the annular fluorescent lamp used. Furthermore, since the amount of Na component in the annular glass bulb 1 is reduced,
Coloring of the fluorescent lamp based on the reaction between the Na component and mercury is suppressed, and therefore, the luminous flux maintenance factor of the annular fluorescent lamp 1 can be increased. That is, it is possible to provide the annular fluorescent lamp 1 with improved lamp characteristics and life characteristics.

In the above-described embodiment, the case where the present invention is applied to a ring-shaped fluorescent lamp has been described. However, the present invention is not limited to this, and the present invention is not limited to this. Can be applied to various fluorescent lamps subjected to a heat treatment up to the above temperature, and in such a case, the lamp characteristics and the life characteristics can be similarly improved.

FIG. 2 is a schematic plan view of a ring-shaped fluorescent lamp according to the second embodiment. This ring-shaped fluorescent lamp has a first
A low softening point alkali glass having the same composition as the glass bulb of the annular fluorescent lamp 10 of the embodiment is used, but the annular glass bulb 1 has a smaller tube diameter than that of the first embodiment. . The glass bulb 1 is filled with a discharge medium containing a rare gas mainly composed of argon (Ar) and mercury, and a phosphor layer 2 is formed on the inner surface of the glass bulb 1. Electrodes (not shown) as a pair of electrode means are provided at both ends of the glass bulb 1, and a base 5 is provided so as to straddle between both ends of the glass bulb 1. These form a tubular fluorescent lamp 20. The ring-shaped fluorescent lamp 2
The reference numeral 0 indicates that high-frequency power of 10 kHz or higher is supplied to discharge at a high frequency and output visible light efficiently.

The annular fluorescent lamp 20 of the second embodiment is
FCL32W is a ring-shaped fluorescent lamp with a tube diameter of about 29mm
The outer diameter D1 of the glass bulb 1 is equivalent to the shape.
Is in the range of 285 to 310 mm, for example, 299 mm, the ring inner diameter D2 is 266 mm when the ring outer diameter D1 is 299 mm, and the tube outer diameter d is, for example, 16.5 mm in the range of 15 to 18 mm.
The glass bulb 2 is formed to have a thickness of 0.8 to 1.2 mm, for example, 1.0 mm. The ring-shaped fluorescent lamp 20 has a lamp power within a range of 20 to 40 W and is operated at a high frequency of 10 kHz or more. In particular, the rated lamp power is 27 W and the high-power operation is 38.
Lights with W. The model name of the annular fluorescent lamp 20 is FH
C27.

Further, a ring-shaped fluorescent lamp 2 of another type is used.
0 is FCL which is an annular fluorescent lamp with a tube diameter of about 29 mm
As an equivalent to the 40W type, the ring outer diameter D1 of the glass bulb 1 is in the range of 365 to 390 mm, for example, 373 m.
m, the ring inner diameter D2 is 340 when the ring outer diameter D1 is 373 mm.
mm, pipe diameter d is in the range of 15 to 18 mm, for example, 16 m
m, the thickness of the glass bulb 2 is formed in the range of 0.8 to 1.2 mm, for example, 1.1 mm. The ring-shaped fluorescent lamp 20 is turned on at a high frequency of 10 kHz or more with a lamp power in the range of 28 to 50 W, and is particularly turned on at a rated lamp power of 34 W and high output lighting of 48 W. The model name of this annular fluorescent lamp 20 is FHC34
It is. The ring-shaped fluorescent lamp 20 includes an FHC 20,
The model name of FHC41 is also applicable.

The fluorescent layer of the annular fluorescent lamp 20 is
Blue region around 430-460 nm, 535-550n
m and a red region near 605 to 620 nm.
A phosphor that becomes 00k (three-wavelength daylight light source color) can be used, but another kind of phosphor may be used.

After the phosphor is applied to the inner surface of the glass bulb 1 and fired to form a phosphor layer, the glass bulb 1 is bent into a single ring as in the first embodiment. It is exhausted using.

The mercury sealed in the glass bulb 1 may be sealed in a liquid state. However, in order to reduce surplus mercury, it is preferable that the mercury is sealed by granular pellets 6 as a mercury releasing structure. The granular pellets 6 can be made of a zinc-mercury alloy having a diameter of about 0.5 to 3 mm. By enclosing the granular pellets 6, the amount of mercury sealed in the bulb 1 is as small as about 6 mg. Can be

Here, the ring-shaped fluorescent lamp 20 is
In this case, the cross-sectional area of the glass bulb 1 is 1.65 cm ² , and the lamp current at the time of high-power lighting at which the maximum lamp current value is obtained is 380 mA. Therefore, the lamp current density is 230 mA / cm ² . The FHC 2 of this embodiment
Both the 7-type annular fluorescent lamp 20 and the conventional FHC27-type annular fluorescent lamp having a glass bulb made of soda-lime glass (Na ₂ O content: 15 to 17% by mass) have a rated life. When the lamp was turned on for 9000 hours, it was confirmed that the lamp of the present embodiment improved the luminous flux maintenance rate by about 10% as compared with the comparative example.

FIG. 3 is a schematic plan view of a double ring fluorescent lamp according to the third embodiment. Double ring fluorescent lamp 30
Has glass bulbs 1 and 1 ′ as first and second annular containers having different ring diameters from each other. The bulbs 1 and 1 ′ are concentrically located on the same plane and Communication is established. In addition, this valve 1,
The outside diameter of the tube 1 ′ is about 20 mm and the wall thickness is about 1.2 mm, and the outside diameters of the bulbs 1 and 1 ′ are 355 mm and 4 mm, respectively.
00 mm.

The first and second electrodes 3 and 3 are sealed at one end of the bulbs 1 and 1 '. Bridge 8
The bulbs 1 and 3 are so arranged that a discharge is generated between the electrodes 3 and 3.
The discharge space is formed by blow-off so that the discharge space communicates with a position 15 to 30 mm away from the end portions 1c, 1c 'on the other end side of 1'.

Between the bridge 8 and the other end portions 1c and 1c 'of the bulbs 1 and 1', there is a discharge path non-forming region 9 where no discharge path is formed. Is the coldest part.

Reference numeral 5 denotes a base, which is mounted across one end of the bulbs 1 and 1 'in which the electrodes 3 and 3 are sealed, and the other end 1c and 1c' of the other end. The base 5 is mounted on the bulbs 1 and 1 'so as not to cover a part of the bridge 8 and the discharge path non-forming region 9 on the bridge 8 side.

Mercury is sealed in the glass bulbs 1 and 1 '. This mercury is sealed in a liquid state and, similarly to the second embodiment, is made of zinc-containing zinc having a diameter of about 0.5 to 3 mm. It may be enclosed by granular pellets as a mercury releasing structure made of a mercury alloy. Further, the granular pellets may be movably sealed, or may be melted and fixed to the inner surface of the bulb in the discharge path non-forming region 9. When the granular pellets are fixed to the discharge path non-forming region 9 where the coldest portion is formed, mercury can be effectively collected in the coldest portion by utilizing the action of the mercury adsorption force of the granular pellet after starting lighting. Therefore, troubles such as a dark spot immediately after lighting are unlikely to occur, and the lamp characteristics can be stabilized early.

Here, the annular fluorescent lamp 30 is the FHD 10
In the case of 0, the lamp power is about 97 W, and the lamp is lit at a high frequency of 10 kHz or more. In addition, the volume inside the bulb of the annular fluorescent lamp 30 is about 550 cm ³ , and the amount of mercury sealed when the mercury is sealed in granular pellets is about 6 mg. Is 0.0109 mg / cm ³ .
The ring-shaped fluorescent lamp 30 was turned on during the rated life (9000 hours), but no trouble occurred in the lamp characteristics due to depletion of mercury.

FIG. 4 is a sectional view of a lighting apparatus provided with the fluorescent lamp of each of the above embodiments. Note that the lighting fixture of the present embodiment uses the ring-shaped fluorescent lamp of the second embodiment.

The lighting fixture 40 comprises a lighting fixture main body 41, ring-shaped fluorescent lamps 20, 20 'having different ring outer diameters, a translucent shade 44, a lighting device 45, and the like. The annular fluorescent lamps 20 and 20 ′ have the same structure as that shown in FIG. 2 and are arranged concentrically with the lamp sockets 46 and 47 of the lighting fixture main body 41. The ring-shaped fluorescent lamp 20 has a tube outer diameter of 16.5 mm, a ring outer diameter of 373 mm, and a lamp power of 34 W. The ring-shaped fluorescent lamp 20 'has a tube outer diameter of 16.5 mm, a ring outer diameter of 299 mm, and a lamp power of 27 W. A lighting device 45 composed of a high-frequency inverter is accommodated in the luminaire main body 41, and the ring-shaped fluorescent lamps 20 and 2 are housed therein.
0 '. The lighting device 45 energizes the ring-shaped fluorescent lamps 20, 20 'at a high frequency. Lighting fixture body 41
Is locked and fixed to the ceiling 48 via an electric connection device or the like, and the front surface is covered with the shade 44.

The fluorescent lamp used in the luminaire 40 of the present embodiment may be either the annular fluorescent lamp 10 of the first embodiment or the double annular fluorescent lamp 30 of the third embodiment.

Next, specific examples of the present invention and evaluation results thereof will be described. Example 1

First, 72.0% by mass of SiO ₂ and Al ₂ O
₃ , 3.5% by mass, 8.0% by mass of Na ₂ O, 3.0% by mass of K ₂ O, 2.0% by mass of Li ₂ O, and 1.0% by mass of CaO.
0% by mass, 0% by mass of MgO, 6.0% by mass of BaO,
1.0% by mass of SrO, 2.0% by mass of B ₂ O ₃ , ZnO
After melting a glass composition having a composition of 1.3% by mass and Sb ₂ O ₃ of 0.2% by mass based on the oxidative melting method,
A glass tube was prepared according to a conventional method. In addition, the softening temperature of the above-mentioned glass composition is 580 ° C.

The above glass tube (tube outer diameter 29.5 mm,
A blue phosphor, a green phosphor and a red phosphor are correlated on the inner surface with a wall thickness of 1.2 mm and a tube length of 590 mm).
Then, a phosphor coating solution containing the three-wavelength phosphor mixed so as to be coated was applied, dried and baked according to a conventional method to form a phosphor layer. Next, stem portions having electrodes at both ends of the glass tube were heat-sealed. Glass having the same composition as the glass for the glass bulb described above was used for the glass constituting the stem portion.

Next, a glass tube having a stem portion heat-sealed at both ends was heated to about 750 ° C., the inside of the tube was evacuated, and then wound around a drum to form an annular glass bulb.
Thereafter, mercury was sealed together with the argon gas in the ring-shaped glass bulb, and the exhaust pipe was finally sealed to obtain the intended FCL30 / 28-type ring-shaped fluorescent lamp.

On the other hand, as Comparative Example 1 with the present invention, a conventional glass tube made of soda-lime glass (Na ₂ O content: 16% by mass, softening temperature: 690 ° C.) was used, and the heating temperature during bending was used. In the same manner as in Example 1 except that the temperature was changed to about 770 ° C., an FCL30 / 28 type annular fluorescent lamp was obtained.

When the total luminous flux of each of the ring-shaped fluorescent lamps of Example 1 and Comparative Example 1 thus obtained was measured, the total luminous flux of the ring-shaped fluorescent lamp of Example 1 was 2% as compared with Comparative Example 1.
It has been confirmed that it has improved. Further, when the luminous flux maintenance ratio of each of these ring-shaped fluorescent lamps after lighting for 2,000 hours was measured, it was confirmed that Comparative Example 1 was 88%, while Example 1 was improved to 91%. Was. Example 2

First, 70.4 mass% of SiO ₂ and Al ₂ O
₃ is 1.9% by mass, Na ₂ O is 6.4% by mass, K ₂ O is 8.1% by mass, Li ₂ O is 1.4% by mass, and CaO is 1.% by mass.
9 wt%, MgO 1.0 wt%, BaO 1.5 wt%, SrO 5.4 wt%, B ₂ O ₃ is 1.9 wt%, Z
After melting a glass composition having a composition of 0% by mass of nO and 0.1% by mass of Sb ₂ O ₃ based on an oxidative melting method,
A glass tube was prepared according to a conventional method. In addition, the softening temperature of the above-mentioned glass composition is 575 ° C.

The above glass tube (tube outer diameter 29.5 mm,
A blue phosphor, a green phosphor and a red phosphor are correlated on the inner surface with a wall thickness of 1.2 mm and a tube length of 590 mm).
Then, a phosphor coating solution containing the three-wavelength phosphor mixed so as to be coated was applied, dried and baked according to a conventional method to form a phosphor layer. Next, stem portions having electrodes at both ends of the glass tube were heat-sealed. Glass having the same composition as the glass for the glass bulb described above was used for the glass constituting the stem portion.

Next, a glass tube having a stem portion heat-sealed at both ends was heated to about 740 ° C., the inside was evacuated, and then wound around a drum to form an annular glass bulb.
Thereafter, mercury was sealed together with the argon gas in the ring-shaped glass bulb, and the exhaust pipe was finally sealed to obtain the intended FCL30 / 28-type ring-shaped fluorescent lamp.

When the total luminous flux of the ring-shaped fluorescent lamp of Example 2 obtained in this way was measured, the total luminous flux of the ring-shaped fluorescent lamp of Example 2 was 1.5% higher than that of Comparative Example 1. Was confirmed. Further, when the luminous flux maintenance ratio of the ring-shaped fluorescent lamp of Example 2 after lighting for 2000 hours was measured, it was confirmed that the luminous flux maintenance ratio was improved by 3.5%. Example 3

First, 68.7% by mass of SiO ₂ , Al ₂ O
₃ 1.8 wt%, Na ₂ O is 7.8 wt%, K ₂ O is 4.7 wt%, Li ₂ O is 1.5 wt%, CaO is 3.
8% by mass, 2.2% by mass of MgO, 3.0% by mass of BaO, 5.6% by mass of SrO, 0.3% by mass of B ₂ O ₃ , Z
A glass composition having a composition of nO of 0% by mass, Sb ₂ O ₃ of 0.4% by mass, and Fe ₂ O ₃ of 0.03% by mass was melted based on an oxidative melting method, and then the tube was melted according to a conventional method. Outer diameter 29.
A glass tube having a length of 5 mm, a thickness of 1.2 mm, and a length of 580 mm was prepared. The softening temperature of the above-mentioned glass composition is 6
80 ° C.

On the inner surface of the glass tube, 2 emitting blue light
1. A mixed phosphor composed of a monovalent europium-activated barium magnesium aluminate phosphor, a green-emitting cerium and terbium-co-activated lanthanum phosphate phosphor, and a trivalent europium-activated yttrium oxide phosphor emitting a red color. 0 g was applied and a phosphor layer was formed through a baking process. After that, through a sealing step and a glass bulb bending step, in an exhausting step, argon gas was filled with 320 Pa, and mercury was filled in an amount of 4 mg in the form of a zinc alloy to complete an FCL30 / 28 type annular fluorescent lamp. In this case, the amount of enclosed mercury per lamp internal volume is 0.012 mg / cm ³ .

When the lamp was continuously lit, the lamp continued to be lit without depletion of mercury even for 10,000 hours, which far exceeded the rated life of 6000 hours.

[0103]

According to the first aspect of the present invention, a glass bulb having a Na ₂ O content of 11% by mass or less and a softening temperature of 685 ° C. or less is bent into a single ring, whereby Na components are easily precipitated. The total luminous flux and the luminous flux maintenance factor of the fluorescent lamp can be increased by minimizing the amount of the Na component deposited while minimizing the heating step.

According to the second aspect of the present invention, the fluorescent lamp of the first aspect is operated under the condition that the lamp current density is 200 mA / cm ² or more. Since the Na component that reacts with mercury is equal to or less than a certain amount, a decrease in the transmittance of the bulb is suppressed, and the luminous flux maintenance factor of the fluorescent lamp can be improved.

According to the third aspect of the present invention, since the inside of the valve is evacuated by using the residual heat at the time of bending, a separate heating step for exhaust is not required. Precipitation of components can be suppressed.

According to the fourth aspect of the present invention, the amount of mercury charged in a glass bulb whose Na ₂ O content is 1 to 11% by mass and whose softening temperature is 685 ° C. or less is constant with respect to the bulb internal volume. Therefore, the precipitation amount of Na component is minimized, the consumption of mercury during lamp operation is suppressed, and even if the amount of enclosed mercury is reduced, the lamp can be lit in a desired state until the rated life. it can.

According to the fifth or sixth aspect of the present invention, the glass composition is set within a specific range, so that the glass composition has a softening temperature, a processing temperature, and physical characteristics within a practical range for mass production of glass tubes and lamps. can do.

According to the seventh aspect of the present invention, it is possible to provide a fluorescent lamp including a phosphor layer containing a three-wavelength phosphor having a main emission peak in each wavelength range.

According to the eighth aspect of the present invention, since the glass bulb and the stem have the same glass composition, the sealing of the stem is easy, and it is not necessary to separate the glass when recycling the fluorescent lamp. Reuse of the glass material is facilitated.

According to the ninth aspect of the present invention, it is possible to provide a lighting apparatus including the fluorescent lamp according to any one of the first to eighth aspects.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a configuration of a first embodiment in which a fluorescent lamp of the present invention is applied to a ring-shaped fluorescent lamp.

FIG. 2 is a plan view showing the configuration of the second embodiment.

FIG. 3 is a plan view showing the configuration of the third embodiment.

FIG. 4 is a schematic diagram of a lighting fixture provided with the fluorescent lamp of each of the above embodiments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ring-shaped glass bulb, 2 ... Phosphor layer, 3 ... Electrode, 4 ...
Stem, 5 ... Base, 10, 20, 30 ... Ring-shaped fluorescent lamp

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // F21Y 103: 02 (72) Inventor Shoji Naoki 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo TOSHIBA LIGHTEC (72) Inventor Taeko Fukamachi 4-3-1 Higashi Shinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation

Claims (9)

[Claims] 1. A glass bulb filled with a discharge gas, a phosphor layer formed on an inner surface of the glass bulb,
A fluorescent lamp which is provided at both ends of the glass bulb and has a stem portion having an electrode, and which is formed into a single ring after forming the phosphor layer on the inner surface of the glass bulb, wherein the glass bulb comprises: 1 to 11% by mass of Na ₂ O,
10% by mass of K ₂ O, 0 to 3% by mass of LiO (provided that
Na ₂ O, the total amount of K ₂ O and Li ₂ O 5 to 20
%), A glass having a composition containing 0.1 to 0.5% by mass of Sb ₂ O ₃ , containing substantially no lead, and having a softening temperature of 685 ° C. or less. Features fluorescent lamp. 2. The fluorescent lamp according to claim 1, wherein a lamp current per unit sectional area of the glass bulb is 200 mA / cm ² or more. 3. The fluorescent lamp according to claim 1, wherein the glass bulb is bent into a single ring, and then exhausted by using residual heat at the time of bending. 4. A glass bulb filled with a discharge gas, and a phosphor layer formed on an inner surface of the glass bulb.
A fluorescent lamp which is provided at both ends of the glass bulb and has stems having electrodes, and which is bent after forming the phosphor layer on the inner surface of the glass bulb, wherein the glass bulb is 1 to 11 mass% of Na ₂ O,. 1 to
10% by mass of K ₂ O, 0 to 3% by mass of Li ₂ O (provided that
Na ₂ O, the total amount of K ₂ O and Li ₂ O 5 to 20
%), A glass having a composition containing 0.1 to 0.5% by mass of Sb ₂ O ₃ , containing substantially no lead, and having a softening temperature of 685 ° C. or less, and The amount of mercury enclosed in the glass bulb is 0.
003 to 0.016 mg / cm ³ . 5. The glass constituting the glass bulb,
SiO ₂ is 60 to 75 wt%, Al ₂ O ₃ is 1 to 5 mass%, Na ₂ O is 1 to 11 wt%, K ₂ O is 1 to 10 mass%, Li ₂ O 0 to 3 wt%, Na ₂ O + K ₂ O + Li ₂ O
Is 5 to 20% by mass, CaO is 0 to 3% by mass, and MgO is 0% by mass.
２2 mass%, BaO 1-10 mass%, SrO 0.5
3. 10% by mass, CaO + MgO + BaO + SrO
5 to 16 wt%, B ₂ O ₃ 0 to 3 wt%, ZnO is 0
3 wt%, Sb ₂ O ₃ is claims 1 to 4 fluorescent lamps of any one described characterized by having a composition of 0.1-0.5 wt%. 6. The glass constituting the glass bulb,
SiO ₂ is 60 to 75 wt%, Al ₂ O ₃ is 1 to 5 mass%, Na ₂ O is 1 to 11 wt%, K ₂ O is 1 to 10 mass%, Li ₂ O 0 to 3 wt%, Na ₂ O + K ₂ O + Li ₂ O
Is 5 to 20% by mass, CaO is 2 to 5% by mass, and MgO is 1%.
-3% by mass, 1-10% by mass of BaO, 0.5% of SrO
3. 10% by mass, CaO + MgO + BaO + SrO
5 to 17 wt%, B ₂ O ₃ 0 to 3 wt%, ZnO is 0
3 wt%, Sb ₂ O ₃ is 0.1 to 0.5 mass%, Fe ₂ O ₃
5. The fluorescent lamp according to claim 1, wherein the fluorescent lamp has a composition of 0.01 to 0.05% by mass. 7. The phosphor layer has a wavelength of 430 to 460 n.
m, wavelengths 540 to 550 nm and wavelengths 610 to 620
7. The fluorescent lamp according to claim 1, further comprising a three-wavelength phosphor having a main emission peak in each range of nm. 8. The fluorescent lamp according to claim 1, wherein the glass constituting the stem has the same composition as the glass constituting the glass bulb. 9. A fluorescent lamp according to any one of claims 1 to 8, a device main body for supporting the fluorescent lamp, and a lighting device housed in the device main body and lighting the fluorescent lamp. Lighting equipment characterized by being.