JP2002110093A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of reducing an ultraviolet ray by a bulb or an ultraviolet ray reduction substance layer and effectively reducing an influence caused by the ultraviolet ray in the case where the bulb formed by a glass substantially containing no lead is used. SOLUTION: A metal oxide absorbing an ultraviolet ray is contained in the bulb 12 substantially containing no lead and the ultraviolet ray generated from the bulb 12 is absorbed by the metal oxide. The ultraviolet ray generated from the inside of the bulb 12 can be reduced at a wavelength of 300 nm or less to 40% or less by absorbing the ultraviolet ray by the metal oxide contained in the bulb 12. An effect caused by the ultraviolet ray can be effectively reduced even if a tube wall load in lighting is 0.05 W/cm2 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp using glass substantially free of lead.

[0002]

2. Description of the Related Art Conventionally, incandescent light bulbs have been used as a light source for general lighting devices, but in recent years, fluorescent lamps have been increasingly used from the viewpoints of life and lamp efficiency.

FIG. 9 is a schematic vertical sectional view of a typical compact fluorescent lamp. As shown in FIG. 9, this bulb-type fluorescent lamp 100 has a glove 101 formed of synthetic resin or glass, and a cover 103 having a base 102 and formed of a synthetic resin to constitute an outer container.
In the globe 101, a saddle-shaped bulb 105 supported by a holder 104 made of a synthetic resin is disposed, and a fluorescent substance is applied to an inner wall surface of the bulb 105. The bulb 105 is provided with a pair of electrodes 106. The bulb-type fluorescent lamp 100 is configured to apply a voltage from an external power supply to the electrode 106 via the base 102 and discharge the electrode 106 to cause the fluorescent substance in the bulb 105 to emit light.

[0004] By the way, since it is desired that the bulb-type fluorescent lamp as described above is reduced in size, the bulb is replaced with a U-shaped bulb.
It is necessary to bend in a letter shape. Therefore, the bulb is formed of lead glass having excellent workability. This is because lead oxide contained in glass has an effect of lowering the softening point and melting point of glass to improve workability.

However, lead is a harmful substance, and in recent years, it has been desired to form a bulb with lead-free glass that does not contain lead because of problems such as environmental pollution due to disposal of used fluorescent lamps.

[0006]

However, when the bulb is formed from lead-free glass containing no lead, the ultraviolet transmittance of the bulb tends to be higher than when the bulb is formed from lead glass. This is because when lead is removed from the glass component and an alkali metal oxide is used as a melting agent, the mixing ratio of ferric oxide (Fe ₂ O ₃ ) is reduced in order to increase the visible light transmittance. It depends on the reason. The fluorescent lamp in which the bulb is formed of lead-free glass has a high ultraviolet transmittance, and thus has various problems.

For example, in the case of a bulb-type fluorescent lamp, ultraviolet rays generated in the bulb pass through the bulb without being sufficiently absorbed or reflected by the bulb. However, there is a problem that a holder made of synthetic resin deteriorates due to ultraviolet rays. In particular, the deterioration of the holder due to ultraviolet rays rapidly progresses due to the synergistic effect of the ultraviolet rays and the temperature when the maximum temperature of the holder exceeds 100 ° C., so that the deterioration is remarkable in a compact fluorescent lamp having a relatively high tube wall load. It was also found that other types of fluorescent lamps have the same type of problem due to an increase in the amount of ultraviolet light emitted when the tube wall load exceeds a predetermined value.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and when a bulb made of glass substantially containing no lead is used, a fluorescent light capable of effectively reducing the influence of ultraviolet light. It is intended to provide a lamp.

[0009]

The fluorescent lamp according to the present invention is substantially free of lead and has a sodium oxide content of 1%.
UV transmittance formed from glass of 0% by mass or less is 3
A bulb of not more than 00 nm and 40% or less; a mercury gas and a rare gas sealed in the bulb; a phosphor formed on the inner wall surface of the bulb; and a pair of discharge electrodes for generating a discharge in the bulb. And the tube wall load at the time of lighting is 0.05W / c
characterized in that m ² or more.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The valves are, for example, double U, triple U,
Alternatively, a valve having a bent portion such as an annular shape or a valve having a shape such as a straight pipe can be used, but is not limited thereto. The glass which does not substantially contain lead may contain lead of an impurity level.

The term “sodium oxide of 10% by mass or less” includes the case where sodium oxide is not contained in the valve. When the amount of sodium oxide contained in the valve is specified to be 10% by mass or less,
This is because the sodium component of sodium oxide precipitates on the inner wall surface of the bulb when the fluorescent lamp is turned on, causing blackening due to the reaction between the sodium component and mercury gas.
When such blackening occurs, the luminous flux decreases, and sufficient brightness cannot be maintained.

The ultraviolet transmittance of the bulb means a state in which the bulb is not coated with a phosphor, and can be measured with a glass piece having the same thickness as the bulb.

The reason that the ultraviolet transmittance of the bulb is 40% or less at 300 nm or less is that if the ultraviolet transmittance of the bulb is higher than 40% at a wavelength of 300 nm or less, the amount of ultraviolet light transmitted through the bulb increases. This is because there is a problem that the member made of synthetic resin disposed around the valve is deteriorated, and the life of the member is shortened.

Preferably, the bulb has an ultraviolet transmittance of 3 wavelengths.
It is 10% to 40% when the thickness is 00 nm or less. The reason that the UV transmittance of the bulb is preferably 10% to 40% at a wavelength of 300 nm or less is that, when the UV transmittance of the bulb is decreased, the transmittance of visible light tends to decrease. If the transmittance is within the above range, ultraviolet light can be effectively reduced by the bulb, and sufficient brightness can be maintained because the decrease in visible light transmittance due to the decrease in ultraviolet transmittance is small. is there.

The rare gas is preferably, for example, argon gas or krypton gas, and the rare gas includes a mixed rare gas.

The fluorescent lamp of the present invention is effective when the tube wall load at the time of lighting is 0.05 W / cm ² or more. Here, the tube wall load Bw (W / cm ² ) is defined by the following equation (1). _{Bw = W l / πd · Le} ...... (1) However, _{W l:} lamp power (W), d: inner diameter of the valve (cm), Le: a discharge electrode distance (cm).

The reason why the tube wall load at the time of lighting is specified to be 0.05 W / cm ² or more is that when the tube wall load at the time of lighting is less than the above value, the amount of ultraviolet light generated inside the bulb is small, so that the influence of ultraviolet light is small. Because there is little. Further, when the tube wall load is 0.1 W / cm ² or more, the amount of ultraviolet rays to be radiated increases, which is particularly effective.

The fluorescent lamp according to the present invention is substantially free of lead and is made of glass having a sodium oxide content of not more than 10% by mass and having an ultraviolet transmittance of not more than 300 nm and not more than 40%.
% Or less, the ultraviolet light can be effectively reduced by the bulb. Therefore, when a bulb made of glass substantially containing no lead is used, even if the tube wall load at the time of lighting is 0.05 W / cm ² or more, it is possible to effectively reduce the influence of ultraviolet rays. it can.

As a result, for example, even if a member disposed around the bulb is deteriorated by irradiation of ultraviolet rays such as a synthetic resin, the deterioration of the member can be prevented.

Here, one of the causes of deterioration of the member made of synthetic resin is, for example, that synthetic resin is generally composed of a polymer, and since this polymer has an absorbing property to ultraviolet rays, Is absorbed to form an excited state, but if the excitation energy cannot be efficiently released, it is considered that the main chain or side chain of the polymer is cut off. The deterioration mentioned here includes, for example, cracking, discoloration to yellow or milky white, or liberation of low molecular weight in the synthetic resin.

Further, since the bulb is formed of glass substantially containing no lead, when the used fluorescent lamp is discarded, almost no lead is discharged and environmental pollution can be prevented.

According to a second aspect of the present invention, there is provided the fluorescent lamp according to the first aspect, wherein the bulb contains the ultraviolet reducing substance in an amount of 0.05% by mass or more based on the total mass of the glass. And

The ultraviolet ray reducing substance is an ultraviolet ray (380 nm
(The following wavelengths) are absorbed or reflected, and examples thereof include metal oxides and synthetic resins. Examples of the metal oxide include a group including ferric oxide (Fe ₂ O ₃ ), cerium oxide (CeO ₂ ), titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and zinc oxide (ZnO). One or more metal oxides selected from the group consisting of These metal oxides are preferred because more ultraviolet light can be absorbed or reflected, so that the ultraviolet light can be reliably reduced by a bulb made of glass substantially free of lead. It is. Further, among these metal oxides, cerium oxide (CeO)
₂ ) is most preferred. Cerium oxide (CeO ₂ ) is most preferred because cerium oxide (CeO ₂ ) has a low ultraviolet transmittance and a high visible light transmittance. Therefore, when cerium oxide (CeO ₂ ) is contained, a bright fluorescent lamp which is less affected by ultraviolet rays and can be provided.

The reason that the ultraviolet ray reducing substance is contained in an amount of 0.05% by mass or more based on the total weight of the glass is that when the total weight of the ultraviolet ray reducing substance is lower than the above value, the ultraviolet ray is effectively absorbed or reflected. Because they cannot do it.

In the fluorescent lamp of the present invention, since the bulb contains the ultraviolet ray reducing substance in an amount of 0.05% by mass or more based on the total weight of the glass, the ultraviolet ray generated from mercury atoms is absorbed or reflected by the ultraviolet ray reducing substance. The UV transmittance of the bulb can be reliably reduced to 40% or less at a wavelength of 300 nm or less. Therefore, the influence of ultraviolet rays can be reliably reduced. Also, it can be easily manufactured.

[0027] The fluorescent lamp according to the third aspect is the second aspect.
Fluorescent lamp, wherein the ultraviolet light reducing substance is
Iron (Fe₂O₃), Cerium oxide (CeO)₂), Or
Ferric oxide (Fe₂O₃) And cerium oxide (CeO)₂)
And a mixture thereof. 4. The fluorescence of claim 3
The lamp uses an ultraviolet light reducing substance, ferric oxide (Fe).
₂O ₃), Cerium oxide (CeO)₂) Or oxidized second
Iron (Fe₂O₃) And cerium oxide (CeO)₂Mixed with
Material, so that the UV transmittance of the bulb
It can be reduced to 40% or less at a length of 300 nm or less,
The influence of the outside line can be more reliably reduced.

A fluorescent lamp according to a fourth aspect is the fluorescent lamp according to any one of the first to third aspects, wherein the thickness of the bulb is 0.5 to 1.5 mm and the inner diameter of the bulb is 18 mm.
mm or less. Where the ultraviolet light
The smaller the wall thickness and the smaller the inner diameter of the valve, the easier it is to penetrate the valve. In the fluorescent lamp according to the fourth aspect, the ultraviolet transmittance of the bulb is 40% or less at 300 nm or less.
Even if a bulb having a diameter of 5 to 1.5 mm and an inner diameter of 18 mm or less is used, the effect of ultraviolet rays can be effectively reduced.

A fluorescent lamp according to a fifth aspect of the present invention provides a bulb substantially free of lead and having a sodium oxide content of 10% by mass or less; a mercury gas and a rare gas sealed in the bulb. A phosphor formed on the inner wall surface of the bulb; an ultraviolet ray reducing material layer containing an ultraviolet ray reducing substance formed on at least one of the inner wall surface of the bulb and the outer wall surface of the bulb; A pair of discharge electrodes; and the total ultraviolet transmittance of the bulb and the ultraviolet reduction layer is 300 nm or less and 40% or less.

As the ultraviolet ray reducing substance, the same substances as those described in the description of the fluorescent lamp in claim 2 can be used.

The ultraviolet ray reducing substance layer may be formed on at least one of the inner wall surface and the outer wall surface of the bulb, and only on the inner wall surface, only on the outer wall surface, and on the inner wall surface and the outer wall surface. It may be formed in both. In addition, when forming on an inner wall surface, it forms between an inner wall surface and a fluorescent substance.

The term "on the inner wall surface" and "on the outer wall surface" include both cases where the valve is in direct or indirect contact with the valve.

When the ultraviolet light reducing substance is a metal oxide, the ultraviolet light reducing substance layer can be formed by, for example, the following various methods. It can be formed by dispersing metal oxide fine particles as an ultraviolet ray reducing substance in a solvent, applying the dispersion to a bulb and drying. When formed by this method, the thickness can be, for example, about 1 μm, and the visible light transmittance can be increased.

The metal alkoxide can be hydrolyzed and fired to form a metal oxide coating ultraviolet ray reducing substance layer. When formed by this method,
The thickness is on the order of nanometers, a very thin and dense layer can be formed, and the visible light transmittance can be increased.

For example, it can also be formed by mixing a synthetic resin such as polyethylene terephthalate with an ultraviolet ray reducing substance, forming the synthetic resin into a film, and coating the film by winding.

For example, it can also be formed by mixing a synthetic resin such as polyethylene terephthalate with an ultraviolet ray reducing substance, forming the synthetic resin into a tube, and coating the bulb by heat shrinkage. In addition, it can also be formed using a sol-gel method.

When the ultraviolet ray reducing substance is a synthetic resin, the ultraviolet ray reducing substance layer can be formed, for example, by the following method. Make the synthetic resin into a film,
It can be formed by coating the bulb by winding.

It can also be formed by forming a synthetic resin into a tube and coating the bulb by heat shrinkage. As such a synthetic resin, for example, one or more thermoplastic synthetic resins selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polypropylene, tetrafluoroethylene, and polycarbonate can be used.

The total ultraviolet transmittance of the bulb and the ultraviolet ray reducing layer means that the bulb is coated with an ultraviolet ray reducing substance layer on a tube in which no fluorescent substance is applied, and the glass has the same thickness as the bulb. It can be measured by forming an ultraviolet light reducing material layer on the piece.

In the case of the present invention, since the total ultraviolet transmittance of the bulb and the ultraviolet ray reducing layer is 300 nm or less and 40% or less, the ultraviolet transmittance of the bulb is not necessarily 300 nm.
It does not need to be less than 40% below.

A fluorescent lamp according to a fifth aspect of the present invention includes a bulb substantially made of lead-free glass having a sodium oxide content of 10% by mass or less; and at least one of an inner wall surface and an outer wall surface of the bulb. An ultraviolet ray reducing substance layer containing an ultraviolet ray reducing substance formed on one side, and the total ultraviolet transmittance of the bulb and the ultraviolet ray reducing layer is 300 nm.
Since it is 40% or less below, ultraviolet rays can be reduced in at least one of the bulb and the ultraviolet ray reducing substance layer. Therefore, when a bulb made of glass substantially containing no lead is used, the influence of ultraviolet rays can be effectively reduced.

According to a sixth aspect of the present invention, there is provided the fluorescent lamp according to the fifth aspect, wherein a tube wall load at the time of lighting is 0.05 W /.
cm ² or more. It is particularly effective when the tube wall load is 0.1 W / cm ² or more. In the fluorescent lamp according to the sixth aspect, since the total ultraviolet transmittance of the bulb and the ultraviolet ray reducing layer is 300 nm or less and 40% or less, even if the tube wall load at the time of lighting is 0.05 W / cm ² or more, the ultraviolet ray may be emitted. Can be reduced.

A fluorescent lamp according to a seventh aspect is the fluorescent lamp according to any one of the first to sixth aspects, wherein the bulb has a U-shaped bent portion.

The fact that the bulb has a U-shaped bent portion generally means a so-called bulb-type fluorescent lamp having a built-in lighting circuit and an Edison base base. Examples of the bulb-type fluorescent lamp include so-called A-type, G-type, and T-type fluorescent lamps. The bulb-type fluorescent lamps include those without a glove for protecting the fluorescent lamp.

In the fluorescent lamp according to the seventh aspect, since the bulb has a U-shaped bent portion, the fluorescent lamp can be made compact.

Even when the fluorescent lamp is used without gloves for protecting the fluorescent lamp, the ultraviolet rays generated inside the bulb are reduced by the bulb, so that the influence of the ultraviolet rays can be reduced. In addition, it is possible to prevent deterioration of the member formed of the synthetic resin.

The fluorescent lamp according to claim 8 is the fluorescent lamp according to any one of claims 1 to 7, wherein the bulb is supported by a supporting member formed of a synthetic resin, and the supporting member is supported by the supporting member. It is characterized by containing a metal oxide absorbing 5% by mass or more of ultraviolet rays with respect to the member.

The synthetic resin forming the support member is a synthetic resin which does not soften at the maximum temperature of the support member when the fluorescent lamp is used. Specifically, for example, polyethylene terephthalate, polybutylene terephthalate, polypropylene, 4-fluoroethylene One or two or more thermoplastic synthetic resins selected from the group consisting of ethylene chloride and polycarbonate.

As the metal oxide, for example, ferric oxide (Fe ₂ O ₃ ), cerium oxide (CeO ₂ ), titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and zinc oxide (ZnO) One or more metal oxides selected from the group consisting of These metal oxides are preferred because more ultraviolet rays can be absorbed, so that the ultraviolet rays absorbed by the synthetic resin can be reduced, and the deterioration of the support member can be reliably prevented. Because.

The reason that the supporting member contains 5% by mass or more of the metal oxide with respect to the supporting member is that if the value is less than the above value, the content of the metal oxide is small, so that the total This is because the absorption amount is reduced, and the deterioration of the support member cannot be effectively prevented.

Generally, when the maximum temperature of the support member exceeds 100 ° C. when the fluorescent lamp is used, the deterioration rate of the support member formed of a synthetic resin for supporting the bulb rapidly increases due to a synergistic effect of ultraviolet light and temperature. I do. In particular, in the case of a bulb-type fluorescent lamp, since the bulb is bent in a U-shape, the amount of ultraviolet light applied to the support member during lighting becomes large and the maximum temperature of the support member exceeds 100 ° C. .

However, in the present invention, the ultraviolet transmittance of the bulb or the total ultraviolet transmittance of the bulb and the ultraviolet reducing material layer is reduced to 40% or less at a wavelength of 300 nm or less, so that the influence of the ultraviolet rays on the support member is prevented. be able to. That is, the support member made of synthetic resin is 1
Even if the temperature exceeds 00 ° C., it is possible to prevent the deterioration rate of the support member from rapidly increasing.

[0053] The fluorescent lamp of claim 8 is supported by a support member formed of a synthetic resin, and the support member contains a metal oxide that absorbs 5% by mass or more of ultraviolet rays with respect to the support member. Therefore, even when the bulb is supported by a support member formed of a synthetic resin, the deterioration of the support member can be prevented, and the life of the fluorescent lamp can be extended.

[0054]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a fluorescent lamp according to a first embodiment of the present invention will be described. In this embodiment, a description will be given using a bulb-type fluorescent lamp.

FIG. 1 is a vertical sectional view schematically showing a bulb-shaped fluorescent lamp according to this embodiment, and FIG. 2 is a bottom view schematically showing the bulb-shaped fluorescent lamp. As shown in FIGS. 1 and 2, a light bulb shaped fluorescent lamp 1 according to the present embodiment includes an outer container 2. This outer container 2
Is composed of a translucent globe 3 for protecting a fluorescent lamp 9 described later and a cover 5 having a base 4.

Although the shape of the globe 3 is arbitrary, in the present embodiment, a globe 3 having a smooth curved surface having substantially the same shape as a glass bulb of an incandescent lamp and having an opening is used. Will be explained.

The globe 3 is formed of a transparent material such as glass or a synthetic resin or a diffusion transmitting material, and can change the light distribution or light color of light emitted from the fluorescent lamp 9 described later. It has become.

The cover 5 is formed by integrally forming a hollow conical cylindrical portion 6 and a small-diameter cylindrical portion 7 provided at the upper end of the cylindrical upper portion 6. The cylindrical portion 6 of the cover 5
The lower end and the edge near the opening of the glove 3 are fixed with, for example, a silicone-based thermosetting adhesive 8.

The cover 5 is made of, for example, polyethylene terephthalate (PET) or polybutylene terephthalate (P
(BT) is made of a synthetic resin having excellent heat resistance.

A base 4 made of a conductive material such as brass or aluminum is fixed to the small-diameter cylindrical portion 7 of the cover 5 with an adhesive or caulking, for example. Power is supplied from a power supply to a lighting circuit 10 described later, and a voltage can be applied between a pair of filament electrodes 24 described later.

As the base 4, for example, a screw-type base such as an Edison type E26 type can be used.

Inside the outer container 2 composed of the globe 3 and the cover 5, three fluorescent lamps 9 bent in a U-shape, a lighting circuit 10 for lighting the fluorescent lamp 9, and A holder 11 as a support member for supporting the fluorescent lamp 9 and the lighting circuit 10 is provided. The fluorescent lamp 9 is fixed to the holder 11 with a silicone adhesive or the like, and is indirectly supported by the cover 5.

The lighting circuit 10 is composed of an inverter circuit or the like that generates AC high-frequency power. Specifically, for example, a plurality of electronic components such as an electrolytic capacitor and a transistor are arranged on both sides of a substantially disk-shaped circuit board. Formed. The lighting circuit 10 is housed inside the cover 5 by being supported by the holder 11.

The holder 11 is formed in a cylindrical shape having a bottom, and an opening is formed in the bottom for inserting the end of the fluorescent lamp 9 bent in a U-shape and supporting it substantially vertically. In the vicinity of the opening, a silicone adhesive is applied for fixing the fluorescent lamp 9. Holder 11
Is, for example, polyethylene terephthalate, polybutylene terephthalate, polypropylene, tetrafluoroethylene,
And one or more of the highest temperatures during use (e.g., about 100-120) selected from the group consisting of
(° C.) so as not to soften. By forming the holder 11 from a synthetic resin, it is possible to easily manufacture the holder 11 and to reduce the cost.

The synthetic resin forming the holder 11 contains 5% by mass or more of a metal oxide with respect to the holder 11. As the metal oxide, for example, ferric oxide (F
e ₂ O ₃ ), 1 or 2 selected from the group consisting of cerium oxide (CeO ₂ ), titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and zinc oxide (ZnO)
The above metal oxides are more preferable.

The holder 11 is formed with a claw portion and a step portion. The lighting circuit 10 can be supported by placing the lighting circuit 10 on the step portion and pressing it with the claw portion. I have.

A silicone thermosetting adhesive fixing the glove 3 and the cover 5 is in contact with the side surface of the holder 11, and the holder is attached to the outer container 2 composed of the glove 3 and the cover 5. 11 is fixed.

Next, the fluorescent lamp 9 according to the present embodiment will be described. The fluorescent lamp 9 includes three bulbs 12 (12a, 12b, 12c) bent in a U-shape. The valves 12 are connected to each other by communication pipes 13 formed at two adjacent locations. This communication forms one discharge path. Here, the bulb 12 which is bent in a U-shape according to the present embodiment uses glass substantially containing no lead oxide.

FIG. 3 is a vertical sectional view schematically showing the inside of the fluorescent lamp 9 of the compact fluorescent lamp 1 according to the present embodiment. As shown in FIG. 3, the bulb 12 is formed of a translucent glass, and the bulb 12 includes a metal oxide that absorbs ultraviolet rays as an ultraviolet ray reducing substance that reduces ultraviolet rays, for example, based on the total glass mass. It is contained in an amount of 0.05% by mass or more. Examples of the metal oxide include ferric oxide (Fe ₂ O ₃ ) and cerium oxide (Ce).
O ₂ ), one or more metal oxides selected from the group consisting of titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and zinc oxide (ZnO) are preferred. Among them, for example, ferric oxide (Fe ₂ O ₃ ),
Cerium oxide (CeO ₂ ) or ferric oxide (Fe ₂
A mixture of O ₃ ) and cerium oxide (CeO ₂ ) is more preferred.

The bulb 12 contains, for example, 10% by mass or less of sodium oxide based on the total mass of the glass.

Further, for example, 0.05% by mass or less of antimony oxide (S
b ₂ O ₃ ). here,
The antimony oxide of 0.05% by mass or less means that the valve 12
This also includes the case where no antimony oxide is contained in the glass. The reason why the content of antimony oxide is set to the above value or less is that the bulb formed by the fining method using antimony oxide can increase the brightness, but since antimony oxide is a harmful substance, it causes environmental pollution. Because it causes. Therefore, environmental pollution can be prevented by setting the content of antimony oxide to 0.05% by mass or less based on the total mass of glass of the bulb 12.

The thickness and the inside diameter of the valve 12 can be, for example, the same or less than those of a normal valve. Specifically, the thickness of the valve 12 is set to 0.5 to
1.5 mm and an inner diameter of 18 mm or less.

Such a valve 12 is formed by mixing a raw material such as a metal oxide or sodium oxide with a predetermined composition, sufficiently heating and melting, and then gradually or rapidly cooling. The softening temperature of the glass when forming the bulb 12 is 660 to 680 ° C. Softening temperature is 6
When the temperature is 60 to 680 ° C., it is easy to form a small and bent valve.

The bulb 12 is filled with mercury gas and a rare gas such as argon or krypton. The mercury gas and the rare gas are excited or ionized by the discharge of the filament electrode 24 described later. .

On the inner wall surface of the valve 12, for example,
460 nm, 540-560 nm, and 600-620
Three kinds of phosphors 21 activated by a rare earth element having an emission peak wavelength in a wavelength region of nm are formed, and visible light and ultraviolet light are generated by ultraviolet light generated from excited mercury gas. .

At least one end of the bulb 12 has a thin tube 22 formed therein.
3 is enclosed. By enclosing the amalgam 23 in the thin tube 22, the vapor pressure of mercury can be controlled, and a decrease in brightness due to a rise in temperature can be prevented.

Fluorescent lamp 9 with three bulbs 12 connected
The filament electrodes 24 that generate electric discharge are respectively disposed at the pair of ends. The filament coils of the pair of filament electrodes 24 are coated with an electron-emitting substance such as barium oxide, calcium oxide, and strontium oxide. Preheating the filament electrodes 24 or applying a voltage between the filament electrodes 24 is performed. Thereby, thermoelectrons are emitted from the electron emitting material of the filament coil.

An auxiliary amalgam 26 is provided on the pair of inner wells 25 supporting the filament electrode 24. By releasing the mercury contained in the auxiliary amalgam 26 immediately after lighting, the luminous flux immediately after lighting can be rapidly raised, and the luminous flux can be stabilized quickly.

The bulb-type fluorescent lamp 1 is configured to be turned on with a power consumption of 12 W. At this time, the power input to the fluorescent lamp 9 is about 10 W, and the tube wall load is 0.1 W / cm ² .

Next, the lighting operation of the bulb-type fluorescent lamp 1 according to the present embodiment and the action of the bulb 12 on ultraviolet rays will be described. Light bulb-type fluorescent lamp 1 according to the present embodiment
First, power is supplied to the lighting circuit 10 from the external power supply (not shown) via the base 4. When power is input to the lighting circuit 10, the filament electrodes 24 are preheated, and the pair of filament electrodes 2 are heated.
Voltage is applied between four. And the filament electrode 2
When 4 is heated, thermoelectrons are emitted from the electron emitting material of the filament coil. The thermoelectrons accelerate and move, collide with mercury atoms and rare gas, and discharge to excite the mercury atoms. Excited mercury atoms are mainly 253.7 nm
And 185 nm ultraviolet light to excite the phosphor 21 formed on the inner wall surface of the bulb 12. Visible light is generated from the excited phosphor 21 and the bulb-type fluorescent lamp 1 is turned on.

[0101] Light bulb-shaped fluorescent lamp 1 according to the present embodiment
Turns on under a high tube wall load condition of 0.05 W / cm ² or more, and a lot of ultraviolet rays are generated from mercury atoms. In the bulb-type fluorescent lamp 1 according to the present embodiment, the metal oxide that absorbs the ultraviolet rays Is used, it is possible to effectively reduce the amount of ultraviolet rays emitted from the fluorescent lamp 9 by absorbing a large amount of ultraviolet rays generated from mercury atoms with the metal oxide contained in the bulb 12. it can.

Specifically, the bulb 12 is made to contain, for example, 0.05 to 3.0% by mass of a metal oxide capable of absorbing ultraviolet rays with respect to the total mass of the glass of the bulb 12 so that the ultraviolet transmittance of the bulb 12 is increased. At 300 nm or less can be reduced to 40% or less.

By adjusting the content of the metal oxide, the ultraviolet transmittance of the bulb 12 can be increased to 10 to 40% at 300 nm or less.

As described above, in the bulb-type fluorescent lamp 1 according to the present embodiment, the metal oxide that absorbs ultraviolet light in the bulb 12 is, for example, 0.1% with respect to the total glass mass of the bulb 12.
When the content is 05% by mass or more, ultraviolet light can be effectively reduced by the bulb 12 formed of glass substantially containing no lead. As a result, even if the tube wall load at the time of lighting is 0.05 W / cm ² or more, the influence of ultraviolet rays on members such as the holder 11 formed of a synthetic resin and disposed around the fluorescent lamp 9 may be reduced. Can be reduced.

Since the content of sodium oxide is 10% by mass or less, the valve 12 is blackened (so-called ultra
Violation solarization can be suppressed, and sufficient brightness can be maintained.

Since the bulb 12 is made of glass substantially free of lead, the used bulb-type fluorescent lamp 1
When discarded, environmental pollution can be prevented without emitting lead.

Since the metal oxide is contained in the bulb 12 as an ultraviolet ray reducing substance, the ultraviolet rays can be reduced more reliably and it can be easily manufactured.

The bulb-type fluorescent lamp 1 is used. The bulb 12 contains a metal oxide as an ultraviolet ray reducing substance, and the holder 11 formed of a synthetic resin adjacent to the bulb 12 contains a metal oxide. Therefore, even if the temperature of the holder 11 exceeds 100 ° C., the deterioration rate of the holder 11 does not increase rapidly.

(Examples) Examples will be described below. In this example, the transmission characteristics with respect to the wavelength of a bulb having the same shape as the bulb 12 used in the bulb-type fluorescent lamp 1 according to the first embodiment and having no phosphor formed thereon were measured.

Table 1 exemplifies the composition of the bulb 12 used in the bulb-type fluorescent lamp 1 according to the first embodiment.

[Table 1] The valve according to the present example used had a composition according to Sample A in Table 1. That is, 0.05 to 0.3% by mass of ferric oxide (Fe ₂ O ₃ ) as an ultraviolet ray reducing substance,
And a valve containing 10% by mass or less of sodium oxide (Na ₂ O) and containing substantially no lead oxide.

In this embodiment, a fluorescent lamp having an inner diameter of the bulb of about 0.9 cm, a distance between the discharge electrodes of 35.0 cm, and a lamp power of 10 W (total power including the lighting circuit is 12 W) is used. did. That is, a fluorescent lamp having a tube wall load of about 0.1 W / cm ² at the time of lighting was used.

For comparison with the valve according to the present example, the transmission characteristics of the valve with respect to the wavelength were also measured for a valve containing substantially no lead oxide as Comparative Example 1 and a valve containing lead oxide as Comparative Example 2.

Further, the bulb of Comparative Example 1 which contained substantially no lead oxide also contained 10% by mass or less of sodium oxide based on the total weight of the glass.

FIG. 4 is a graph showing the transmission characteristics with respect to the wavelength of the bulb according to this embodiment and Comparative Examples 1 and 2. As shown in FIG. 4, the bulb according to the present example had an ultraviolet transmittance of about 30% at 300 nm, whereas the bulb substantially free of lead oxide according to Comparative Example 1 had an ultraviolet transmittance of about 30%. The transmittance was about 48% at 300 nm.

In the visible region, the bulb of this example and the bulb of lead-free glass containing no ultraviolet light reducing substance of Comparative Example 1 both have a transmittance of about 90 to 92.
%, Whereas the lead glass bulb containing lead oxide according to Comparative Example 2 had a transmittance of about 88 to 90%.

Therefore, ferric oxide (Fe ₂ O ₃ ) was added to the bulb as an ultraviolet ray reducing substance in an amount of 0.0
When the content was 5 to 0.3% by mass, it was confirmed that the ultraviolet transmittance of the bulb could be reduced to 40% or less at 300 nm or less and the transmittance in the visible region was very high.

As a result, it was confirmed that deterioration of members formed of, for example, a synthetic resin and disposed around the bulb could be effectively prevented, and sufficient brightness could be maintained.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described.
An embodiment will be described. In the following description, among the embodiments after this embodiment, description of contents which are the same as those of the preceding embodiment will be omitted.

In the present embodiment, the metal oxide layer is formed between the inner wall surface of the bulb and the phosphor. here,
The bulb according to the present embodiment does not contain a metal oxide as an ultraviolet ray reducing substance and has an ultraviolet transmittance of 30%.
It is 40% or more at 0 nm or less.

FIG. 5 is a vertical sectional view schematically showing an enlarged bulb of the bulb-type fluorescent lamp 1 according to the present embodiment. As shown in FIG. 5, the inner wall surface of the bulb 30 and the phosphor 2
1, a metal oxide layer 31 that absorbs, for example, ultraviolet rays as an ultraviolet ray reducing substance layer is formed with a thickness of, for example, about 1 μm.

The metal oxide used for the metal oxide layer 31 is preferably the same metal oxide as the metal oxide of the first embodiment. The metal oxide layer 31 is formed, for example, by dispersing the above-described metal oxide in a solvent,
It is formed by applying it to the inner wall surface of and drying it.

As described above, in the bulb-type fluorescent lamp 1 according to the present embodiment, since the metal oxide layer 31 for absorbing ultraviolet rays is formed between the inner wall surface of the bulb 30 and the phosphor 21, the bulb 30 has And the total ultraviolet transmittance of the metal oxide layer 31 at 40 nm or less at 300 nm or less. Therefore, in the case where the bulb 30 made of glass substantially containing no lead is used, the influence of ultraviolet rays can be effectively reduced.

Since the metal oxide layer 31 is formed by the method described above, the metal oxide layer 31 having a thickness of about 1 μm is formed.
Can be formed, and the visible light transmittance can be increased.

Even after the bulb 30 is formed in a predetermined shape, the ultraviolet transmittance can be reduced to 40% or less at 300 nm or less.

(Third Embodiment) Hereinafter, a third embodiment of the present invention will be described.
An embodiment will be described. In the present embodiment, the outer wall surface of the valve is covered with a film formed of a synthetic resin. Here, the bulb according to the present embodiment does not contain a metal oxide as an ultraviolet ray reducing substance, and has an ultraviolet transmittance of 300 nm or less and 40% or more.

FIG. 6 is an enlarged vertical sectional view schematically showing the bulb of the compact fluorescent lamp 1 according to the present embodiment. As shown in FIG. 6, the outer wall surface of the bulb 40 is formed, for example, of about 1 μm
The film 41 is coated with a thickness of

Since the synthetic resin has a property of absorbing ultraviolet rays, the film 41 can absorb the ultraviolet rays by covering the outer wall surface of the bulb 40 with the film 41 formed of the synthetic resin. .

The synthetic resin film 4 according to the present embodiment
1 is formed by a general method such as extrusion molding, and coats the valve 40 by winding. It is preferable that the film 41 contain the same metal oxide as the metal oxide of the first embodiment. By including the metal oxide in the film 41 formed of the synthetic resin, the ultraviolet light emitted from the inside of the bulb 40 can be further reduced.

As described above, in the bulb-type fluorescent lamp 1 according to the present embodiment, since the outer wall surface of the bulb 40 is covered with the film 41 made of synthetic resin, the total ultraviolet light of the bulb 40 and the film 41 is The transmittance can be reduced to 40% or less at 300 nm or less. Therefore, when the bulb 40 made of glass substantially containing no lead is used, the influence of ultraviolet rays can be effectively reduced.

Since the outer wall surface of the bulb 40 is covered with the film 41, even after the bulb 40 is formed into a predetermined shape, the ultraviolet transmittance can be reduced to not more than 40% at 300 nm or less and the cost can be reduced. Can be planned. Since the outer wall surface of the bulb 40 is covered with the film 41, the film 41 can be coated on the outer wall surface of the bulb 40 even with the bulb-type fluorescent lamp 1 in use.

(Fourth Embodiment) Hereinafter, a fourth embodiment of the present invention will be described.
An embodiment will be described. In this embodiment, the outer wall surface of the valve is covered with a synthetic resin tube containing a metal oxide. Here, the bulb according to the present embodiment does not contain a metal oxide as an ultraviolet ray reducing substance, and has an ultraviolet transmittance of 300% or less and 40%.
That's all.

FIG. 7 is a vertical sectional view schematically showing an enlarged bulb of the compact fluorescent lamp 1 according to the present embodiment. As shown in FIG. 7, a tube 51 is coated on the outer wall surface of the valve 50 with a thickness of, for example, about 1 μm made of a synthetic resin. This tube 51 contains the same metal oxide as the metal oxide of the first embodiment. The tube 51 of the synthetic resin according to the present embodiment covers the valve 50 by heat shrinkage.

As described above, in the bulb-type fluorescent lamp 1 according to the present embodiment, since the outer wall surface of the bulb 50 is covered with the synthetic resin tube 51 containing a metal oxide, the bulb 50 and the tube 51 can be reliably connected. Can be reduced to 40% or less at 300 nm or less. Therefore, when the bulb 50 made of glass substantially containing no lead is used, the influence of ultraviolet rays can be effectively reduced.

Since the bulb 50 is covered by heat shrinkage, the tube 51 can be covered with the bulb 50 in close contact with the bulb 50.

The present invention is not limited to the contents described in the above-described first to third embodiments.
The arrangement and the like of each member can be appropriately changed without departing from the gist of the present invention.

In the first to fourth embodiments, the globe 3 for protecting the fluorescent lamp 9 is provided on the bulb-type fluorescent lamp 1, and the bulb-type fluorescent lamp according to the modified example is schematically shown. As shown in FIG. 8, which is a vertical sectional view shown in FIG.
It is also possible to remove and use. In this case, since the bulb 12 contains the ultraviolet ray reducing substance and the layer of the ultraviolet ray reducing substance is formed on the inner wall surface of the bulb 30 or on the outer wall surfaces of the bulbs 40 and 50, even when the globe 3 is removed, the bulb 12 may be used. , For example, formed of a synthetic resin, and the valve 12,
Deterioration of members disposed around 30, 40, 50 can be prevented.

In the first to fourth embodiments, only when the metal oxide is contained in the bulb 12, only when the metal oxide layer 31 is provided between the inner wall surface of the bulb 30 and the phosphor 21, or Film 41, tube 5 on outer wall of valve 40
Although only the case where 1 is provided has been described, it is also possible to combine them.

In the first to fourth embodiments, the holder 11
Contains a metal oxide, but it is not necessary to contain it.

Although the first to fourth embodiments have been described using the bulb-type fluorescent lamp 1, any other fluorescent lamp that generates ultraviolet light can be used.

In the second embodiment, the metal oxide layer 31 is provided on the inner and outer wall surfaces of the valve 30. However, a metal oxide layer may be provided on the outer wall surface of the valve 30.

In the third and fourth embodiments, the film 41 and the tube 51 are formed of a synthetic resin. However, the synthetic resin layer may be formed by applying a synthetic resin to the outer wall surfaces of the valves 40 and 50. It is possible.

[0122]

As described above in detail, according to the fluorescent lamp of the first aspect, when a bulb made of glass substantially containing no lead is used, the ultraviolet ray is reduced by the bulb and the ultraviolet ray is reduced. Can be effectively reduced.

According to the fluorescent lamp of the second aspect, the ultraviolet transmittance of the bulb can be reliably reduced to 40% or less at a wavelength of 300 nm or less, and the influence of the ultraviolet rays can be reliably reduced. Also, it can be easily manufactured.

According to the fluorescent lamp of the third aspect, the ultraviolet transmittance of the bulb is more reliably reduced to 40% at a wavelength of 300 nm or less.
The influence of ultraviolet rays can be reduced more reliably.

According to the fluorescent lamp of the fourth aspect, even if a bulb having a wall thickness of 0.5 to 1.5 mm and an inner diameter of 18 mm or less is used, the effect of ultraviolet rays can be effectively reduced. it can.

According to the fluorescent lamp of the fifth aspect, when a bulb made of glass substantially containing no lead is used, at least one of the bulb and the ultraviolet ray reducing substance layer reduces ultraviolet rays. The effect of ultraviolet rays can be effectively reduced.

According to the fluorescent lamp of the sixth aspect, even if the tube wall load at the time of lighting is 0.05 W / cm ² or more, the influence of ultraviolet rays can be reduced.

According to the fluorescent lamp of claim 7, the fluorescent lamp can be made compact.

According to the fluorescent lamp of the eighth aspect, even when the bulb is supported by the support member made of synthetic resin, the deterioration of the support member can be prevented, and the life of the fluorescent lamp can be reduced. Can be stretched.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view schematically showing a compact fluorescent lamp according to a first embodiment.

FIG. 2 is a bottom view schematically showing the compact fluorescent lamp according to the first embodiment.

FIG. 3 is a vertical sectional view schematically showing the inside of the bulb of the bulb-type fluorescent lamp according to the first embodiment.

FIG. 4 is a graph showing the transmission characteristics of the bulb with respect to the wavelength of the bulb according to the example and the comparative example.

FIG. 5 is an enlarged vertical sectional view schematically showing a bulb of a light bulb-shaped fluorescent lamp according to a second embodiment.

FIG. 6 is an enlarged vertical sectional view schematically showing a bulb of a light bulb-shaped fluorescent lamp according to a third embodiment.

FIG. 7 is an enlarged vertical cross-sectional view schematically showing a bulb of a bulb-type fluorescent lamp according to a fourth embodiment.

FIG. 8 is a vertical sectional view schematically showing a bulb-type fluorescent lamp according to a modification.

FIG. 9 is a schematic vertical sectional view of a conventional typical light bulb-shaped fluorescent lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light bulb fluorescent lamp 11 ... Holder 12, 30, 40, 50 ... Bulb 21 ... Phosphor 24 ... Filament electrode 31 ... Metal oxide layer 41 ... Film 51 ... Tube

Claims (8)

[Claims] 1. A bulb substantially free of lead and having a sodium oxide content of 10% by mass or less and having a UV transmittance of 300 nm or less and a transmittance of 40% or less; and a bulb enclosed in the bulb. A mercury gas and a rare gas; a phosphor formed on an inner wall surface of the bulb; and a pair of discharge electrodes for generating a discharge in the bulb, and a tube wall load at the time of lighting is 0.05 W / cm. A fluorescent lamp, wherein the number is ^two or more. 2. The fluorescent lamp according to claim 1, wherein the bulb contains an ultraviolet ray reducing substance in an amount of 0.05% by mass or more based on the total mass of the glass. 3. The fluorescent lamp according to claim 2, wherein the ultraviolet ray reducing substance is made of ferric oxide, cerium oxide, or a mixture of ferric oxide and cerium oxide. 4. The valve has a thickness of 0.5 to 1.5 m.
The fluorescent lamp according to any one of claims 1 to 3, wherein m and the inner diameter are 18 mm or less. 5. A bulb formed from a glass substantially free of lead and having a sodium oxide content of 10% by mass or less; a mercury gas and a rare gas sealed in the bulb;
A phosphor formed on the inner wall surface of the bulb; an ultraviolet ray reducing material layer containing an ultraviolet ray reducing substance formed on at least one of the inner wall surface of the bulb and the outer wall surface of the bulb; discharge in the bulb And a pair of discharge electrodes for producing a fluorescent lamp, wherein the total ultraviolet transmittance of the bulb and the ultraviolet ray reducing substance layer is 40% or less at 300 nm or less. 6. The tube wall load at the time of lighting is 0.05 W / cm ^2.
6. The fluorescent lamp according to claim 5, wherein: 7. The fluorescent lamp according to claim 1, wherein the bulb has a U-shaped bent portion. 8. The bulb is supported by a support member formed of a synthetic resin, and the support member contains a metal oxide that absorbs 5% by mass or more of ultraviolet rays with respect to the support member. The fluorescent lamp according to claim 1, wherein: