JP2001283776A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp that enables to restrain interference of light, changing in color and deterioration of a film, caused by transparent protective film, and enables to improve luminescent characteristics of light flux as well. SOLUTION: A fluorescent lamp L1 is provided with a glass tube bulb 1, an electrode 4 provided on this bulb 1, a discharging retaining medium enclosed into the bulb 1, a transparent protective film 6 composed of mixture of metal oxide fine powder and calcium pyrophosphate fine powder wherein a primary particle having larger diameter of grain size than that of the metal oxide fine powder formed on the inner part of the bulb 1, and a fluorescent screen 7 formed in superposition on the transparent protective film 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fluorescent lamp in which a phosphor film and a transparent protective film or a transparent conductive film are formed on the inner surface of a glass tube bulb.

[0002]

2. Description of the Related Art Generally, a fluorescent lamp has a structure in which a phosphor film is formed on the inner surface of a bulb made of a glass tube, and a discharge medium made of a rare gas such as mercury and argon gas is sealed in the bulb. An internal electrode such as a hot cathode or a cold cathode provided at the end of the bulb or an external electrode provided outside the bulb generates a discharge in the bulb, and this discharge ionizes and excites mercury vapor in the bulb to generate ultraviolet rays. As a result, the light is changed to visible light by the phosphor film, and the visible light is emitted to the outside through the bulb.

In this fluorescent lamp, a phosphor film is formed directly on the inner surface of a bulb. Mercury ions penetrate the phosphor film and come into direct contact with the bulb, so that sodium in the glass material constituting the bulb is replaced with sodium. Reacting with mercury produces amalgam, discoloring the bulb, and the luminous efficiency may decrease with the lapse of the operating time of the lamp.

As a means for preventing such a phenomenon, a protective film for preventing mercury from directly contacting the bulb is provided between the inner surface of the bulb and the phosphor film.

That is, aluminum oxide (Al ₂ O ₃ ) and titanium oxide (Ti) are interposed between the inner surface of the bulb and the phosphor film.
O ₂ ), zinc oxide (ZnO), silicon oxide (SiO
₂ ), fine powders of metal oxides such as yttrium oxide (Y ₂ O ₃ ), lanthanum oxide (La ₂ O ₃ ) and boron oxide (B ₂ O ₃ ), and fine powders of calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) By forming a transparent protective film mainly using, for example, mercury ions, the protective film blocks the mercury ions, and also prevents electric repulsion from directly contacting the inner surface of the valve, thereby producing amalgam. And the deterioration of the phosphor film.

[0006] Further, in a ring-shaped fluorescent lamp or a compact fluorescent lamp such as a U-shaped, W-shaped or double U-shaped, a phosphor film is formed by applying a suspension of a phosphor powder on an inner surface in a manufacturing process. The glass bulb is heated to bend or bend.At this time, phosphor particles enter the glass of the softened and melted bulb, destroying the phosphor film and deteriorating the light emission characteristics, or due to phosphor particles entering as foreign matter. Cracks may occur in the valve.

Therefore, usually, a phosphor film is formed on the transparent protective film made of aluminum oxide (Al ₂ O ₃ ) or the like on the inner surface side of the bulb, and the phosphor film is formed when the bulb is heated and melted. Not to get into the bulb glass.
The protection is made by this protective film.

In addition, a lamp that can be turned on immediately without the need for a lighting tube is provided.
For fast-start fluorescent lamps, it is installed on the inner surface of the bulb.
Tin oxide (SnO_Two ) Etc.
When a phosphor film is formed on the bright conductive film, mercury inside the bulb
A minute discharge occurs between the particles and the transparent conductive film, causing the phosphor film to
Dielectric breakdown causes spots such as yellowing and blackening on this phosphor film.
Discoloration occurs. Therefore, the transparent conductive film and the phosphor film
The aluminum oxide (Al_Two O_Three ) And other metal oxidation
Powder or calcium pyrophosphate (Ca_Two P _Two O₇ )
A transparent protective film made of fine powder of
To prevent discoloration of the shape.

In the fluorescent lamp having the above-described transparent protective film formed thereon, the bulb sometimes looks rainbow-colored, and the appearance quality of the lamp is sometimes impaired. The reason why the bulb looks rainbow-colored is considered to be due to the light interference of the coating.

This is because primary particles of the above metal oxide or calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) have a particle size of 1
The fine powder of the metal oxide in the coating liquid has a large cohesive force and is easily solidified. If the dispersibility is low, the light output of the lamp is reduced. In view of this, the dispersibility is increased by means such as long stirring. However, when the dispersion is made high, a fine film of a fine powder is formed, and the above-described interference of light occurs, and the appearance of the lamp is deteriorated.

Therefore, conventionally, a fine powder of a metal oxide, which is located between the two, is applied in a state of agglomeration. However, there is a problem that it is difficult to obtain a coating liquid having a certain dispersibility, and the quality of the lamp, such as appearance and light emission characteristics, varies.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent lamp which can suppress interference of light caused by a transparent protective film, discoloration and deterioration of the film, and improve luminous characteristics such as luminous flux. .

[0013]

According to a first aspect of the present invention, there is provided a fluorescent lamp comprising: a glass tube bulb; electrodes provided on the bulb; a discharge sustaining medium sealed in the bulb; A transparent protective film formed on the inner surface of a metal oxide fine powder and a mixture of calcium pyrophosphate fine powder having primary particles having a larger particle diameter than the metal oxide fine powder, and a transparent protective film on the transparent protective film. And a phosphor film having a multi-layered structure.

When the transparent protective film is mixed with a fine powder of metal oxide and a fine powder of calcium pyrophosphate having a primary particle diameter larger than that of the fine powder of the metal oxide, the interference is prevented even when the fine powder of the metal oxide is highly dispersed. This has the effect of preventing the lamp from becoming rainbow-colored and shining due to light interference.

In the claims and the following claims, the technical meanings of the terms are as described below unless otherwise specified.

The elongated glass tube bulb is sealed at both ends with stems having electrodes, and can transmit visible light emitted from the phosphor film, and can surround the discharge inside by isolating the discharge from the surrounding atmosphere. The material, shape and dimensions are not limited. Generally, glass tube bulbs such as soda lime glass and lead glass are often used for reasons such as environmental friendliness, economy and workability.

The shape of the glass tube bulb may be a straight tube, ring, U-shape, W-shape, double U-shape (saddle-shape), H-shape or the like.

As the stem for sealing both ends of the glass tube bulb, a flare stem, a button stem, a bead stem or the like can be used.

The discharge soot body is composed of mercury and a rare gas,
As mercury, liquid or pellet-like mercury or a mercury releasing structure can be used. In the case of this mercury releasing structure, mercury is released by high-frequency induction heating and sealed in a bulb. Note that amalgam may be used.

As the rare gas, argon (Ar) is mainly used, but any one of neon (Ne), krypton (Kr), xenon (Xe) and helium (He) and a mixture of any two or more thereof are used. Can be used.
A known range can be applied to the noble gas charging pressure.

As a metal oxide forming a transparent protective film
Are zinc oxide (ZnO), titanium oxide (TiO_Two ),acid
Aluminum chloride (Al_Two O), silicon oxide (SiO
_Two ), Yttrium oxide (Y_Two O_Three ), Lanthanum oxide
(La_Two O_Three ) Or boron oxide (B_Two O _Three ) Etc.
Material can be used.

As the phosphor film, various known phosphors can be used. For example, for a fluorescent lamp for general illumination, a halophosphate phosphor, a three-wavelength rare earth phosphor, or the like can be used. Needless to say, any phosphor can be used according to the purpose and grade of the fluorescent lamp.

As the pair of electrodes, a hot cathode composed of a coil-shaped filament is usually used. However, in the present invention, a sintered body such as a ceramic having an electron emitting material or a cold cathode such as nickel may be used.

Next, the operation of the fluorescent lamp of the present invention will be described. When the fluorescent lamp according to claim 1 of the present invention is started through a lighting circuit, a discharge is started between a pair of electrodes by initial electrons emitted from the electrodes, and the discharge causes mercury to evaporate to generate ultraviolet rays. I do. Since the ultraviolet light excites the phosphor, the phosphor emits visible light and the fluorescent lamp is turned on.

Since a transparent protective film is formed between the inner surface of the glass tube bulb and the phosphor film, mercury ions are prevented from penetrating by the protective film, and are also repelled electrically, so that the bulb is electrically repelled. Prevent mercury from directly contacting the inner surface,
Sodium (Na), which is a glass component, and mercury (Hg) react with each other to form amalgam and prevent yellowing and blackening of the phosphor film.

Also, by adding calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) fine powder having a diameter larger than that of the metal oxide to the metal oxide fine powder forming the transparent protective film, the bulb becomes rainbow-colored and bright. It is possible to obscure the defect without making it noticeable.

Further, a transparent protective film is formed on a bulb having a curved or bent shape such as a ring, a U-shape, a W-shape or a double U-shape, so that mercury or a phosphor comes into contact with glass to reduce the strength of the bulb. In addition, it is possible to prevent the valve from sinking into the glass and causing cracks in the bulb.

A fluorescent lamp according to a second aspect of the present invention comprises:
A glass tube bulb, an electrode provided in the bulb, a discharge sustaining medium sealed in the bulb, a transparent conductive film formed on an inner surface portion of the bulb, and formed on the transparent conductive film. A transparent protective film made of a mixture of a metal oxide fine powder and a calcium pyrophosphate fine powder whose primary particles have a larger diameter than the metal oxide fine powder, and a phosphor film overlaid on the transparent protective film. It is characterized by having.

The second aspect of the invention is applied to a rapid start type fluorescent lamp or the like, and has the same effect as the first aspect.

The transparent conductive film is applied and formed on the inner surface of the bulb, and the degree of transparency is colored to such an extent that the visible light emitted by the phosphor is not obstructed to the outside of the bulb. Is also good. It is preferable that an appropriate amount of dopant is added to tin oxide (SnO ₂ ), but the present invention is not limited to this.

This transparent conductive film is usually formed so as to form a mountain shape along the longitudinal direction of the container so that the intermediate film thickness is larger than at both ends in order to increase the resistance value distribution at both ends of the glass tube bulb. Have been.

[0032] The fluorescent lamp according to claim 3 of the present invention comprises:
The metal oxide that constitutes the transparent protective film is aluminum oxide,
The average primary particle size of at least one selected from zinc oxide, titanium oxide, silicon oxide, yttrium oxide, lanthanum oxide, and boron oxide is 10
-100 nm, and the average particle size of the primary particles of calcium pyrophosphate is characterized by being 100-2000 nm.

Various kinds of metal oxides can be used. By mixing and using calcium pyrophosphate having a diameter larger than that of the fine particles of the metal oxide, the same effect as described in the first aspect can be obtained.

The average particle size of the primary particles of the calcium pyrophosphate is 100 to 2000 nm, and the average particle size is 100 n.
If it is less than m, there is no interference prevention effect and a rainbow appears when the valve is viewed. On the other hand, if the average particle size exceeds 2,000 nm, there is a problem that the light transmittance is lowered and the light emission characteristics are reduced.

In consideration of variations and the like, the average particle diameter of various metal oxides is about 25 to 75 nm, and the average particle diameter of calcium pyrophosphate is about 200 to 1000 nm, which is practically preferable.

A fluorescent lamp according to a fourth aspect of the present invention comprises:
It is characterized in that calcium pyrophosphate is added in an amount of 3 to 50% by weight based on the total amount of metal oxides constituting the transparent protective film.

When the ratio of calcium pyrophosphate is less than 3% by weight, there is no light interference preventing effect and a rainbow appears when the bulb is viewed. On the other hand, when the ratio exceeds 50% by weight, there is a problem that the light transmittance is reduced and the light emission characteristics are reduced.

Although the intended purpose can be achieved practically if the mixing ratio is within the above range, the mixing ratio with calcium pyrophosphate with respect to the total amount is preferably about 10 to 40% by weight in consideration of variations and the like. won.

A fluorescent lamp according to a fifth aspect of the present invention comprises:
The thickness of the transparent protective film is 0.3 to 3 μm.

If the thickness of the transparent protective film is less than 0.3 μm, it is too thin and does not function as a protective film.
When the thickness exceeds μm, the transmittance is reduced, the light emission characteristics are reduced, and the amount of impurity gas generated from the coating film is increased, which causes early blackening and the like. Although the intended purpose can be achieved practically if the thickness of the coating is within the above range, it is preferably 0.5 to 2.0 μm in consideration of variations and the like.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1A is a front view of a rapid start type fluorescent lamp L1, and FIG. 1B is a sectional front view showing a part of a bulb portion of the lamp L1 in an enlarged manner.

In the figure, reference numeral 1 denotes a long straight tube-shaped bulb made of soda lime glass, and reference numerals 2 and 2 denote sealing portions for closing both ends of the glass tube bulb 1. 3,
3 are sealed. Lead wires 31, 31 are hermetically sealed to the stems 3, 3 and
A discharge electrode 4 composed of a coil-shaped filament is connected between the first and third coils.

Reference numeral 5 denotes a transparent conductive film made of tin oxide (SnO ₂ ) or the like formed on the inner surface of the bulb 1 and having a starting assisting function. Reference numeral 6 denotes a metal oxide formed on the surface of the transparent conductive film 5. For example, zinc oxide (ZnO) and titanium oxide (TiO ₂ ) and calcium pyrophosphate (Ca ₂ P ₂₎
O ₇ ), a transparent protective film having a thickness of about 1.5 μm and a phosphor film 7 having a thickness of about 20 μm formed on the surface of the protective film 6 and having a thickness of about 20 μm. It is composed of a light emitting rare earth phosphor or a continuous wavelength light emitting halophosphate phosphor.

Further, mercury (Hg) and a rare gas such as argon (Ar), krypton (Kr), xenon (Xe) or the like are sealed in the bulb 1 alone or as a mixture. Further, bases 8, 8 are attached to the sealing portions 2, 2 at both ends of the bulb 1.

In the manufacture of the rapid start type fluorescent lamp L1, for example, a vapor in which several percent of antimony chloride is mixed in dimethyltin dichloride into dimethyltin dichloride is supplied from an opening of a straight tubular glass tube bulb 1 heated to 550 to 600 ° C. The transparent conductive film 5 made of tin oxide (SnO ₂ ) is formed by spraying and thermal decomposition. The transparent conductive film 5 is formed in a thin film as the central portion of the bulb 1 becomes thicker toward the end portion, and it is not necessary to peel off the sealing portion at the end portion. (The formation of the transparent conductive film 5 is not limited to the spray method described above,
It may be formed by a VD method or the like. ) Also, the transparent protective film 6
Are formed as fine powders of zinc oxide (ZnO) and titanium oxide (TiO ₂ ) having an average particle diameter of about 50 nm and calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) having an average particle diameter of about 800 nm as metal oxides. Prepare powder.

Then, this zinc oxide (ZnO) fine powder is
About 50% by weight of titanium oxide (TiO _Two ) About 50 fine powders
100% by weight of the metal oxide of 100% by weight
Calcium phosphate (Ca_Two P_Two O₇ ) Fine powder about 20 weight
%, And weigh these fine powders in a bath such as butyl acetate or water.
Mix in an inder to make a coating suspension.

Then, the transparent conductive film 5 is formed according to a conventional method.
The coating suspension is poured into the inside from the upper end of the straight tubular valve 1 on which the fine powder is formed, the fine powder is applied to the inner surface of the conductive film 5, and the coated film is dried naturally or forcibly to protect the unfired material. Form a coating film.

Next, a phosphor suspension prepared separately is applied onto the unfired protective coating film to form a phosphor coating film. Then, after heating the bulb 1 and pre-baking the unfired phosphor coating film, the phosphor coating films at the portions to be sealed at both ends of the bulb 1 are peeled off so as not to hinder the sealing. At this time, the protective coating film at the portion to be sealed may be peeled off together with the phosphor coating film.

When the peeling of the phosphor coating film at this end is completed, the bulb 1 is heated to about 600 ° C., which is called a baking step.
Through the heated furnace. The binder component, moisture, and other impurities contained in the protective coating film and the phosphor coating film applied by the baking are baked or removed, and the transparent protective film 6 and the phosphor film 7 are formed on the upper surface side of the bulb 1. Is formed.

Next, the stems 3 provided with electrodes 4 at both ends of the straight tubular valve 1 having been baked are sealed. Then, the sealed valve 1 exhausts the inside of the valve 1 through an exhaust pipe (not shown) of the stem 3 while heating, and then injects a rare gas and mercury through the exhaust pipe (note that the valve 1 is sealed). Mercury may be provided in advance in the stem 3 or the exhaust pipe as amalgam.) The exhaust pipe is sealed. Then, the bases 8, 8 are attached to the sealing portions 2, 2 at both ends of the bulb 1 via an adhesive (not shown), and the lamp L1 is completed.

The transparent protective film 6 is made of zinc oxide (ZnO) and titanium oxide (Ti) having an average particle size of about 50 nm.
A fine powder with O ₂ ) and calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) having an average particle size of about 800 nm form a solid solution that is uniformly dissolved, and is formed with a strong adherence having a dense crystal structure.

The transparent protective film 6 having a dense crystal structure
Means that a fluorescent lamp L1 having an improved appearance quality, which does not give a rainbow-colored shine even when the bulb 1 is seen, is obtained, and light transmission is achieved by increasing the particle size of calcium pyrophosphate (Ca ₂ P ₂ O ₇ ). The efficiency is high, a high luminous flux is obtained, and the emission characteristics are improved.

When the fluorescent lamp L1 is started through the lighting circuit device, a discharge is started between the pair of electrodes 4 and 4 by initial electrons emitted from the electrodes 4 and 4, and the discharge causes mercury to evaporate. UV rays are generated. Since the ultraviolet light excites the phosphor film 7, the phosphor film 7 emits visible light, and the fluorescent lamp L1 is turned on.

Since a transparent protective film is formed between the inner surface of the glass tube bulb and the phosphor film, mercury ions are prevented from penetrating by this protective film, and are also repelled electrically so that the bulb is electrically repelled. Prevent mercury from directly contacting the inner surface,
Sodium (Na), which is a glass component, and mercury (Hg) react with each other to form amalgam and prevent yellowing and blackening of the phosphor film.

Further, by adding calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) fine powder having a diameter larger than that of the metal oxide to the metal oxide fine powder forming the transparent protective film, the bulb 1 becomes rainbow-colored. Problems such as shining are not conspicuous and the existence thereof can be obscure.

The transparent protective film 6 is made of calcium pyrophosphate (Ca ₂ ) having an average particle size of 100 to 2,000 nm with respect to the total amount (100% by weight) of the metal oxide fine powder having an average particle size of 10 to 100 nm. P ₂ O ₇₎ 3~5 fine powder
It can be formed by adding and mixing at a ratio of 0% by weight, and a film having a thickness in the range of 0.3 to 3 μm has a predetermined effect.

In Table 1, various amounts of fine powders of a metal oxide and calcium pyrophosphate (Ca ₂ P ₂ O ₇ ) were added and mixed (samples 1 to 5) to form a transparent protective film (each having a thickness of 1.5 μm).
m) to form a rapid start fluorescent lamp (FLR)
40S.EX-N / M) (the same conditions except for the transparent protective film), the appearance, the initial luminous flux value, and the luminous flux maintenance factor after 2,000 hours of illumination (luminous flux value after 2,000 hours illumination / initial luminous flux value × 100) %).

The circles in the item "Appearance" in Table 1 indicate that the bulb did not show a rainbow-colored phenomenon. △
The mark indicates that the bulb was slightly rainbow-colored, but there was no practical problem. The crosses indicate that there was a rainbow-colored phenomenon on the bulb, which was considered problematic.

[Table 1] From the results in Table 1 above, it was confirmed that the products of the present invention shown in Samples 3 and 4 had good appearance, initial luminous flux value and luminous flux maintenance factor, and had no practical problems.

In the above-mentioned rapid start type fluorescent lamp, the transparent protective film 6 containing titanium oxide (TiO ₂ ) as a metal oxide in an amount of 5% by weight or more constitutes the lower transparent conductive film 5. When a small amount (0.1 to 3.0% by weight) of antimony (Sb) is added to tin (Sn), deterioration of the conductive film 5 during the course of lighting of the lamp is prevented, a change in the resistance value is suppressed to a small extent, and the starting characteristic is reduced. Maintain and improve.

Table 2 shows that antimony (S) was contained in tin (Sn).
b) is added in a small amount to form a transparent conductive film 5, and a transparent protective film 6 containing titanium oxide (TiO ₂ ) as a metal oxide is formed on the transparent conductive film 5 to form a rapid start fluorescent lamp (FLR40S.EX). In the case of (−N / M) (the same conditions except for the transparent conductive film and the transparent protective film), the rate of decrease in the resistance of the conductive film is shown as the initial value after completion of the lamp and after lighting for 1000 hours.

The rate of decrease is 100 from the resistance value (decrease rate) after completion of the lamp and the resistance value when the transparent conductive film is formed on the inner surface of the bulb as 1 and the resistance value after completion of the lamp.
This is the resistance value (decrease rate) after lighting for 0 hours.

[Table 2] From the results in Table 2 above, the products of the present invention shown in Samples 2 and 4 show that both the reduction rate of the resistance value after completion of the lamp and the reduction rate of the resistance value after lighting for 1000 hours from the resistance value after the completion of the lamp. It was confirmed that it was small and good, and there was no practical problem without coloring such as blackening.

FIG. 2 shows a general straight tube fluorescent lamp L2 according to a second embodiment, in which FIG. 2 (a) is a front view and FIG. 2 (b) is an enlarged view of a part of a bulb portion of the lamp L2. In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The fluorescent lamp L2 is a rapid start type fluorescent lamp L1 of the first embodiment shown in FIG.
On the other hand, the point that the transparent conductive film 5 is not formed on the inner surface of the valve 1 is different, and other configurations except for this point are almost the same, and the inner surface of the valve 1 is the same as that described in the first embodiment. The same transparent protective film 6 is formed.

When this fluorescent lamp L2 is also started via a lighting circuit device (lighted using a lighting tube or the like), the initial electrons emitted from the electrodes 4, 4 cause a pair of electrodes 4, 4 to emit light.
During this time, a discharge is started, and the mercury is evaporated by the discharge to generate ultraviolet rays. Since the ultraviolet light excites the phosphor film 7,
The phosphor film 7 emits visible light, and the fluorescent lamp L2 is turned on.

In manufacturing the straight tube type fluorescent lamp L2, a protective coating film is formed on the inner surface of the glass tube bulb 1 using the same material as in the first embodiment and a fluorescent film is formed on the protective coating film in the same manner. A body coating film is formed, and the bulb 1 is baked by passing through a heating furnace heated to about 600 ° C. to form a transparent protective film 5 and a phosphor film 6.

After that, the lamp L2 is subjected to steps such as sealing of the bulb 1 and the stem 3, sealing of the exhaust pipe and sealing of the discharge medium, sealing of the exhaust pipe and installation of the base by conventional means. Complete.

As with the first embodiment, a fluorescent lamp L2 having an improved appearance quality that does not appear rainbow-colored and shine even when the bulb 1 is viewed, as in the first embodiment. Further, even if the mercury particles scatter on the phosphor film 7, the permeation thereof is prevented by the protective film 6. As a result, the reaction between the glass component sodium (Na) and mercury is suppressed, so that mercury does not easily adhere, and the generation of amalgam and the deterioration of the phosphor film 7 can be prevented.

FIG. 3 shows a ring-shaped fluorescent lamp L3 according to a third embodiment, in which FIG. 3 (a) is a front view, and FIG. 3 (b) is an enlarged sectional front view showing one end of a bulb of the lamp L3. so,
In the figure, the same parts as those in FIG. 1 or FIG.

This fluorescent lamp L3 has substantially the same configuration as the fluorescent lamp L2 shown in the second embodiment except for the shape of the bulb 1. That is, this lamp L3 is
Is formed into a ring shape, and the first surface is provided on the inner surface of the valve 1.
A transparent protective film 6 similar to that of the second embodiment is formed, and a phosphor film 7 such as a three-wavelength light emitting rare-earth phosphor is formed on the surface of the transparent protective film 6.

In the manufacture of the annular fluorescent lamp L3, a straight tubular bulb 1 having a transparent protective film 5 and a phosphor film 6 formed thereon is obtained in the same manner as in the second embodiment.

Next, a stem 3 having electrodes 4 provided at both ends of the straight tubular valve 1 is sealed. Then, the entire sealed valve 1 is heated and softened, and one sealing portion 2 is gripped by a jig, wound around a circular drum, and formed into a ring shape. At this time, the inside of the valve 1 is pressurized so as not to be crushed.

Then, while heating the valve 1, the stem 3
The interior of the valve 1 is evacuated through an exhaust pipe (not shown), and then a rare gas and mercury are sealed through the exhaust pipe (the mercury is previously provided in the stem 3 or the exhaust pipe as amalgam). There is also.) Seal the exhaust pipe. Then, a base 8 bridging between the sealing portions 2 at both ends of the bulb 1 is attached to complete the lamp L3.

Such a ring-shaped fluorescent lamp L3 is provided by the bulb 1 including the above-described sealing step and bending step.
In the step of heating and raising the temperature, the transparent protective film 6 applied to the inner surface of the bulb 1 is not destroyed even if the temperature exceeds the temperature at which the bulb 1 is softened, and the phosphor forming the phosphor film 7 on the front surface side is not destroyed. Particles can be prevented from sinking into the glass of the bulb 1.

The ring-shaped fluorescent lamp L3 is connected to the second
Similar to the embodiment, the fluorescent lamp L with improved appearance quality does not show a rainbow-colored shine when the bulb 1 is viewed.
3 is obtained. The transparent protective film 6 at the curved portion of the bulb 1 prevents the phosphor particles from sinking into the glass of the bulb 1, cracks and peeling of the phosphor film 7, and prevents a decrease in the strength of the bulb 1. 1 can be prevented from generating cracks. In addition, sodium (N
The formation of amalgam and the deterioration of the phosphor film 7 due to the reaction between a) and mercury can be prevented.

The shape of the curved or bent valve 1 may be U-shaped, W-shaped, double U-shaped (saddle-shaped) or the like or H-shaped in addition to the above-mentioned ring shape. The same effects as described above can be obtained by applying the present invention when forming.

FIG. 4 is a schematic front view showing an example of a lighting apparatus (apparatus) 9 using the rapid start type fluorescent lamp L1 of the present invention. In the figure, reference numeral 91 denotes an apparatus main body, in which a lighting circuit 92 such as a fixture for mounting the apparatus 9 to a building or the like, a power connection mechanism, a stabilizer, and the like is housed. The bases 8 of the fluorescent lamp L1 are mounted on sockets 93 provided on the lower side of the main body 91, and are electrically connected to the base.

The lighting equipment (apparatus) 9 is supplied with power from a lighting circuit 92 such as a power supply connection mechanism and a ballast to the fluorescent lamp L1 via sockets 93, 93, and can stably light the lamp L1.

In this type of lighting equipment (apparatus) 9, it is permissible to provide a reflector or a shade on the main body 91 or the like.

[0079]

According to the first aspect of the present invention, a rainbow-colored shine does not occur even when the bulb is seen, and the reaction between sodium (Na) and mercury of the glass component is suppressed. It is possible to provide a fluorescent lamp whose appearance quality can be improved, for example, generation of amalgam and deterioration of the phosphor film can be prevented, and light emission characteristics with high light transmittance can be improved.

In a lamp having a bulb that is curved or bent, a decrease in the strength of the coating or the bulb can be prevented, and the occurrence of cracks or peeling can be prevented, thereby improving the yield.

According to the second aspect of the present invention, it is possible to provide a rapid start type fluorescent lamp having the same effects as those of the first aspect and having improved appearance quality, luminous characteristics and productivity.

According to the third aspect of the present invention, the same effects as those of the first and second aspects can be obtained by regulating the material for forming the transparent protective film and the particle size.

According to the fourth aspect of the invention, the same effect as described in the first and second aspects can be obtained by regulating the mixing ratio of the transparent protective film forming material.

According to the fifth aspect of the present invention, the same effects as those of the first to fourth aspects can be obtained by regulating the thickness of the transparent protective film.

[Brief description of the drawings]

FIG. 1 shows a rapid start type fluorescent lamp according to a first embodiment of the present invention, wherein FIG. 1 (a) is a front view, and FIG. 1 (b) is an enlarged sectional front view showing a part of a bulb portion of the lamp. It is.

FIG. 2 shows a general straight tube fluorescent lamp according to a second embodiment of the present invention, wherein FIG. 2 (a) is a front view, and FIG. 2 (b) is an enlarged sectional front view showing a part of a bulb portion of the lamp. FIG.

3A and 3B show a ring-shaped fluorescent lamp according to a third embodiment of the present invention, wherein FIG. 3A is a front view and FIG. 3B is a cross-sectional front view showing one end of a bulb of the lamp in an enlarged manner.

FIG. 4 is a schematic front view showing a lighting fixture (apparatus) using the straight tube-type fluorescent lamp shown in FIG. 1 or FIG.

[Explanation of symbols]

 L1: Fluorescent lamp (rapid start type fluorescent lamp) L2: Fluorescent lamp (general straight tube type fluorescent lamp) L3: Fluorescent lamp (ring type fluorescent lamp) 1: Glass tube bulb 2: Seal part 3: Stem 4: Discharge electrode 5: Transparent conductive film 6: Transparent protective film 7: Phosphor film 9: Lighting equipment (lighting device)

Claims (5)

[Claims] 1. A glass tube bulb; an electrode provided on the bulb; a discharge sustaining medium sealed in the bulb; a metal oxide fine powder and an oxide of the metal formed on the inner surface of the bulb. A transparent protective film made of a mixture of calcium pyrophosphate fine particles having primary particles having a larger particle diameter than the material fine powder; and a phosphor film overlaid on the transparent protective film. And fluorescent lamp. 2. A glass tube bulb; an electrode provided on the bulb; a discharge sustaining medium sealed in the bulb; a transparent conductive film formed on an inner surface portion of the bulb;
A transparent protective film formed on the transparent conductive film and made of a mixture of a metal oxide fine powder and a calcium pyrophosphate fine powder whose primary particles have a larger diameter than the metal oxide fine powder; A phosphor film formed on the phosphor layer. 3. The metal oxide constituting the transparent protective film is mainly composed of at least one selected from aluminum oxide, zinc oxide, titanium oxide, silicon oxide, yttrium oxide, lanthanum oxide and boron oxide. The average particle size is 10 to 100 nm, and calcium pyrophosphate has an average primary particle size of 100 to 2,000.
3. The fluorescent lamp according to claim 1, wherein 4. The fluorescent lamp according to claim 1, wherein calcium pyrophosphate is added in an amount of 3 to 50% by weight based on the total amount of the metal oxide constituting the transparent protective film. . 5. The fluorescent lamp according to claim 1, wherein the transparent protective film has a thickness of 0.3 to 3 μm.