JPH11339722A - Vessel and lighting fixture using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vessel having a firm coating film on it, such as a fluorescent lamp, a high-pressure discharge lamp, etc., whose protective film and/or fluorescent film are modified so as to improve a light emitting characteristic such as the radiant flux maintenance factor, etc., and also to prevent a crack of the coating film, its peeling off, etc., completely. SOLUTION: This vessel L1 comprises: a glass bulb 1; a light emitting means 3 provided in an interior of the bulb 1; and a protective film 5 consisting mainly of at least one material selected from a group consisting of lanthanum oxide and yttrium oxide, aluminum oxide, and boron oxide which is formed on an inner surface of the bulb 1. Further, a lighting fixture uses this vessel L1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube provided directly or indirectly on the inner surface of a bulb and having a protective film or a phosphor film formed thereon for preventing invasion of other substances or shielding unnecessary radiation. The present invention relates to a sphere and a lighting device using the tube.

[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, in which a phosphor film is formed directly on the inner surface of a bulb, mercury ions permeate the phosphor film and come into direct contact with the bulb, and sodium (of glass material constituting the bulb) is used. Na) and mercury react to form amalgam, discolor the bulb, and the luminous efficiency may decrease with the elapse of the lamp operating time.

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, between the inner surface of the bulb and the phosphor film, aluminum oxide (Al ₂ O ₃ ) and titanium oxide (Ti
O ₂ ), zinc oxide (ZnO), cerium oxide (Ce ₂ O)
₃ ) By forming a protective film made of a metal oxide such as silicon oxide (SiO ₂ ) or calcium pyrophosphate (Ca ₂ P ₂ O ₇ ), mercury ions are blocked by this protective film, and electrical In addition, direct contact with the inner surface of the bulb is prevented, thereby preventing amalgam formation and deterioration of the phosphor film.

Further, ring-shaped fluorescent lamps and compact fluorescent lamps of U-shape, W-shape, and double U-shape are manufactured by coating a suspension of a phosphor powder on an inner surface thereof in a manufacturing process to form a phosphor film. The bulb is heated to bend or bend, but the phosphor particles enter the glass of the softened and melted bulb, destroying the phosphor film and deteriorating the light emission characteristics. This may cause cracks in the valve.

For this reason, usually, a phosphor film is formed on the protective film made of the above-mentioned aluminum oxide (Al ₂ O ₃ ) on the inner surface side of the bulb, and the phosphor film is formed when the bulb is heated and melted. The protective film prevents the bulb from entering the glass of the bulb.

In a rapid start type fluorescent lamp, when a phosphor film is formed on a transparent conductive film such as tin oxide (SnO ₂ ) having a starting assisting function provided on the inner surface of the bulb, mercury particles inside the bulb are formed. A minute discharge occurs between the transparent film and the transparent conductive film to cause dielectric breakdown of the phosphor film, and the phosphor film undergoes discoloration such as yellowing or blackening. Therefore, the aluminum oxide (Al) is interposed between the transparent conductive film and the phosphor film.
_A protective film made of ₂ O ₃ ) is formed to prevent discoloration of the phosphor film.

[0008] These films are formed of the above-mentioned aluminum oxide (Al ₂ O ₃ ) or calcium pyrophosphate (Ca ₂ P).
_A suspension is prepared by mixing a fine powder of a metal oxide such as ₂ O ₇ ) with butyl acetate or water as a binder, and applying the suspension to the inner surface of a valve or a transparent conductive film. Then, it is dried to form an unfired protective coating film. Next, after the phosphor suspension is applied to the protective coating film and dried, the protective coating film and the phosphor coating film applied to the portion to be sealed at the end of the bulb are peeled off. Thereafter, the protective film and the phosphor film are formed by baking the both coating films.

In a high-pressure discharge lamp such as a metal halide lamp, a coating such as aluminum oxide (Al ₂ O ₃ ) is formed on the inner surface of the outer bulb to form a protective film for blocking ultraviolet rays. Have been done.

However, in a lamp in which a protective film is formed on the inner surface of a glass bulb with the above-described aluminum oxide (Al ₂ O ₃ ) or the like, and a phosphor film is formed on the protective film so as to be laminated thereon, If the thickness of the thin film is 0.3 μm or less, the permeation of mercury and the penetration of the phosphor particles occur, and the thin film does not function as a protective film. Conversely, when the film thickness is increased, the coating film cracks or peels off when the glass bulb is bent or bent in the manufacturing process or when an impact is applied during transportation or handling of the lamp, and the adhesion force is reduced. There is a problem to do.

Therefore, boron oxide (B ₂ O ₃ ) or alkaline earth borate (BaO.B ₂ O ₃ ) is added to aluminum oxide (Al ₂ O ₃ ) as a material for the protective film to increase the film thickness. Even if a protective film without peeling or cracking is proposed,
It has also been implemented.

[0012]

However, when the film thickness is large, light transmission is lost, the light flux is reduced, and the film is easily peeled. In addition, sodium (N
Reacts with a) and becomes, for example, a substance called Na ₂ O.B ₂ O ₃ , which degrades the fluorescent material and lowers the luminous flux maintenance factor. Further, a reaction between glass and a low-melting glass material such as boron oxide (B ₂ O ₃ ) or alkaline earth borate (BaO.B ₂ O ₃ ) forms a further low-melting point in the glass portion. There are drawbacks such as the phosphor being sunk into the glass and the bulb strength being weakened.

The present invention can be applied to a protective film or a phosphor film to improve luminous properties such as luminous flux and luminous flux maintenance factor, and to provide a fluorescent lamp or a high-pressure fluorescent lamp having a strong coating without cracking or peeling. An object of the present invention is to provide a bulb such as a discharge lamp and a lighting fixture using the bulb.

[0014]

According to a first aspect of the present invention, there is provided a bulb comprising: a glass bulb; light emitting means provided inside the bulb; lanthanum oxide or lanthanum oxide formed on an inner surface portion of the bulb. It is characterized by comprising at least one kind of yttrium oxide and a protective film mainly composed of aluminum oxide and boron oxide.

The protective film, by adding lanthanum oxide or yttrium oxide, has the effect of preventing the reaction with mercury (Hg) dipping and reducing the amount of mercury (Hg) consumed by the lamp. Note that lanthanum oxide or yttrium oxide may be used alone or as a mixture of at least one of the two. Further, a light emitting means in the bulb (the light emitting means in the present invention means an electrode of a fluorescent lamp, a discharge gas, a light emitting tube of a high pressure discharge lamp, a filament of an incandescent lamp, etc.),
The present invention can be applied to protective films for various base films such as various shielding films, damage prevention films, anti-coloring films, diffusion films and reflection films of lamps such as incandescent lamps and discharge lamps.

The above-mentioned protective film has a similar effect even if it is mainly composed of at least one kind of lanthanum oxide or yttrium oxide, aluminum oxide or boron oxide, and also contains a small amount of titanium oxide or zinc oxide.

According to a second aspect of the present invention, a bulb is formed on a glass bulb, light emitting means provided on the bulb, a discharge sustaining medium sealed in the bulb, and an inner surface of the bulb. And a protective film mainly composed of at least one of lanthanum oxide or yttrium oxide and aluminum oxide and boron oxide, and a phosphor film formed on the protective film.

A discharge electrode is provided inside or outside the bulb and is applied to a fluorescent lamp or the like in which a discharge rare gas, mercury, or the like is sealed, and has the same effect as that of the first aspect.

According to a third aspect of the present invention, a bulb is formed on a glass bulb, a light emitting means provided on the bulb, a discharge sustaining medium sealed in the bulb, and an inner surface of the bulb. A protective film comprising at least one of lanthanum oxide or yttrium oxide and aluminum oxide and boron oxide as a main component, and overlying the protective film, forming at least one of lanthanum oxide or yttrium oxide on the phosphor powder and aluminum oxide And a phosphor film formed by adding and mixing a binder composed mainly of boron oxide.

According to the second aspect of the present invention, the same effect as described in the second aspect is obtained. In particular, the binder of the phosphor film formed on the protective film is formed by lanthanum oxide or yttrium oxide, aluminum oxide, oxide, Since boron is used, the bonding between the upper and lower layers is increased, and the adherence of the phosphor film becomes stronger, so that cracking and peeling of the coating film are prevented.

The binder of the phosphor film is mainly composed of lanthanum oxide, yttrium oxide, aluminum oxide, and boron oxide, and the same effect can be obtained even if a small amount of titanium oxide, zinc oxide, or the like is mixed. Play.

According to a fourth aspect of the present invention, there is provided a bulb in which a discharge sustaining medium is sealed and discharge electrodes are provided facing each other, an outer bulb containing the arc tube, It is characterized by comprising at least one of lanthanum oxide or yttrium oxide formed directly or indirectly on the inner surface of the outer tube valve and a protective film mainly composed of aluminum oxide and boron oxide. .

When applied to an ultraviolet shielding film or the like of a high pressure discharge lamp such as a metal halide lamp having a double tube structure, the same effect as described in the first aspect is exerted.

The bulb according to claim 5 of the present invention, wherein the glass bulb or the arc tube is bent.

A protective film is formed on a bulb or arc tube having a curved or bent shape such as a ring shape, a U shape, a W shape, a double U shape, etc., so that mercury or a phosphor comes into contact with glass to lower the bulb strength. It is possible to prevent the bulb from being sunk into the glass or cracking the bulb.

According to a sixth aspect of the present invention, in the tube, the protective film has a thickness of 0.5 to 2 μm.

If the thickness of the protective film is less than 0.5 μm, it is so thin that it does not act as a protective film.
If it exceeds, it is too thick, and there is a risk of cracking or peeling. Practically, the thickness is preferably 0.5 to 2.0 µm.

[0028] The tube according to claim 7 of the present invention is characterized in that lanthanum oxide, yttrium oxide, aluminum oxide and boron oxide forming the protective film are a solid solution.

The protective film mainly composed of lanthanum oxide, yttrium oxide, aluminum oxide, and boron oxide is made of a solid solution, has a dense crystal structure, and has a high light transmittance and a high shielding factor for foreign substances. Even if the thickness is increased, no cracking or peeling occurs.

[0030] According to an eighth aspect of the present invention, there is provided a lighting fixture, a fixture main body, the bulb according to any one of the first to seventh aspects mounted on the fixture main body, and lighting of these bulbs. And a lighting circuit.

[0031] The luminaire may be the above-mentioned claim 1 to claim 7.
Since the tube having the operation described in (1) is mounted, it is possible to perform illumination with a small decrease in the initial luminous flux and the luminous flux maintenance rate.

[0032]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 1A shows an annular fluorescent lamp L1.
(B) is a partially sectional front view showing the vicinity of an end of the lamp L1 in an enlarged manner.

In the drawing, 1 is a ring-shaped valve formed by bending soda lime glass, 2 is a stem made of lead glass, 22 and 22 are lead wires provided on the stem 2, 3 is a lead wire 22,
A discharge electrode 4 composed of a filament coil connected between 22 is a sealing portion between the bulb 1 and the stem 2. Also,
5 is a protective film made of a solid solution of lanthanum oxide, aluminum oxide and boron oxide formed on the inner surface of the valve 1,
Reference numeral 6 denotes a three-wavelength light emitting rare earth phosphor or a continuous wavelength light emitting halophosphate phosphor formed on the protective film 5.

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. Reference numeral 21 denotes an exhaust pipe, which is a valve 1
A base 7 is attached between the sealing portions 4 at both ends of the device 7 in a bridging manner.

A method of manufacturing the ring-shaped fluorescent lamp L1 will be described. First, lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), and boron oxide (B ₂
O ₃ ) solid solution of 0.01 to 0.3 μm by coprecipitation
And a coating solution prepared by mixing the fine powder in a binder such as butyl acetate or water is prepared. Then, the application suspension is poured into the inside from the upper end of the straight tubular valve 1 which is erected according to a conventional method, and the fine powder is applied to the inner surface thereof. Then, the coating film is dried naturally or forcibly to form an unfired protective coating film.

Next, a separately prepared phosphor suspension is applied on 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. After the end of the peeling of the phosphor coating film at the end, the bulb 1 is passed through a heating furnace called a baking step, which has been heated to about 600 ° C. 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, whereby the protective film 5 and the phosphor film 6 are formed.

Next, the glass stems 2, 2 provided with electrodes 3 at both ends of the straight tubular bulb 1 which has been baked are sealed. Then, the entire sealed valve 1 is heated and softened, and one sealing portion 4 is gripped by a jig, wound around a circular drum, and formed into an annular shape. At this time, the inside of the valve 1 is pressurized so as not to be crushed.

Thereafter, the stem 2 is heated while the valve 1 is heated.
The interior of the valve 1 is evacuated through the exhaust pipe 21, and then rare gas and mercury are sealed through the exhaust pipe 21 (mercury may be provided in the stem 2 or the exhaust pipe 21 in advance as amalgam. )) The exhaust pipe 21 is sealed. Then, the base 7 is mounted between the sealing portions 4 at both ends of the bulb 1, and the lamp L1 is completed.

Such a ring-shaped fluorescent lamp L1 is manufactured by using the bulb 1 including the above-described sealing step and bending step.
In the step of heating and raising the temperature, if the temperature of the protective coating film applied on the inner surface of the bulb 1 becomes higher than the temperature at which the bulb 1 softens, lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ) A solid solution in which boron (B ₂ O ₃ ) is uniformly melted is formed, and the protective film 5 having a dense crystal structure and strong adhesion is formed.

This protective film 5 having a dense crystal structure is
High light transmittance, high luminous flux, little decrease in luminous flux maintenance ratio, and other improvements in light emission characteristics can be achieved, and even when the film thickness is large, the adherence is strong and the protective film 5 and the phosphor formed on the film 5 Membrane 6
No cracking or peeling occurs.

FIG. 2 shows a second embodiment applied to another type of fluorescent lamp of the present invention. FIG. 2 is a partial cross-sectional front view showing a part of a compact fluorescent lamp L2 having a substantially U-shaped bulb shape, and the same parts as those in FIG. Omitted.

In the second embodiment, a straight tube-shaped bulb 1 made of soda-lime glass has a substantially U-shape obtained by folding an intermediate portion thereof, and crush-sealing portions 4 are formed at both ends. The lead wires 22 supporting the electrode 3 are sealed in the sealing portions 4. A protective film made of a solid solution of lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), and boron oxide (B ₂ O ₃ ) is formed on the inner surface of the valve 1 as in the first embodiment. 5
A phosphor film 6 is formed on the protective film 5 in a multilayer manner.

The lamp L2 is manufactured by a method similar to that of the first embodiment, in which lanthanum oxide (La ₂ O ₃ ) and aluminum oxide (Al
_A protective film 5 made of a solid solution of ₂ O ₃ ) and boron oxide (B ₂ O ₃ ) and a phosphor film 6 are formed in layers. Next, lead wires 22 supporting the electrode 3 are interposed at both ends of the bulb 1, and the portions to be sealed are heated and melted by a burner and pressed by a pincher to form crushed sealing portions 4 and 4. After that, the glass bulb 1 is bent into a substantially U-shape. (Note that the bulb 1 may be bent into a substantially U-shape, and the lead wires 22, 22 supporting the electrodes 3 may be crushed and sealed later.) The lamp L2 is completed through a capping step and the like.

In the case of the compact fluorescent lamp L2, the same operation and effect as those of the first embodiment are obtained, and the protective film 5 and the phosphor film 6 which have high luminous characteristics and are firmly adhered are obtained. Was completed.

FIG. 3 shows a third embodiment in which the present invention is applied to a rapid start type fluorescent lamp L3.
In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

The fluorescent lamp L3 of the third embodiment
Are sealed with stems 2 and 2 provided with discharge electrodes 3 at both ends of a straight tubular glass bulb 1, and a transparent conductive film made of tin oxide (SnO ₂ ) or the like having a start-up assisting action is provided on the inner surface of the bulb 1. 8, a protective film 5 and a phosphor film 6 are formed on the conductive film 8 in the same manner as in the above-described embodiment, and the other structure is not bent by bending the bulb 1. Except for this point, the embodiment is the same as the embodiment of FIG.

The production of the lamp L3 is, for example, 5
A vapor in which several percent of antimony chloride is mixed into dimethyltin dichloride is blown from the opening of the straight tubular glass bulb 1 heated to 50 to 600 ° C., and this is thermally decomposed to form a transparent conductive material made of tin oxide (SnO ₂ ). A film 8 is formed. The transparent conductive film 8 does not need to be peeled off because the central portion of the bulb 1 is thick and the end portions are thin. Then, on this conductive film 8,
Lanthanum oxide (La ₂ O ₃ ) as in the above embodiment,
Aluminum oxide (Al ₂ O ₃ ) and boron oxide (B
_A protective film 5 made of a solid solution of ₂ O ₃ ) and a phosphor film 6 are formed in a layered manner. Thereafter, the lamp L3 is obtained through the same steps as described above.

In the case of the lamp L3, the same operation and effect as those of the first and second embodiments can be obtained.

FIG. 4 shows a fourth embodiment in which the present invention is applied to a double-tube high-pressure discharge lamp L4. 1 in the figure
Reference numeral 1 denotes an outer bulb made of hard glass, and L5 denotes an arc tube supported by lead wires 22, 22 of a stem 2 sealed in a sealing portion 4 of the outer bulb 11. Further, the inside of the outer tube valve 11 is set to a rare gas atmosphere or a vacuum atmosphere. The arc tube L5 is a metal halide lamp,
Crushed sealing portions 41 at both ends of the bulb 12 made of quartz glass,
41, the metal foils 23, 23 are sealed.
Discharge electrodes 31 and 31 are connected to 3. Valve 1
Mercury, a halide, and a rare gas are sealed in 2 as a discharge sustaining medium.

Then, on the inner surface of the outer tube valve 11,
Lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ) and boron oxide (B ₂
A protective film 51 made of a solid solution of O ₃ ) is formed.

The luminous tube L5 is a normal metal halide lamp, the description of which is omitted.
First, in the same manner as in the above embodiment, a coating solution in which a fine powder of a protective film forming material is suspended is prepared, and the coating solution is applied to the inner surface of the outer bulb 11, dried and dried. To form

Then, the stem 2 supporting the arc tube L5 is inserted through the opening of the outer bulb 11, and the outer bulb 11 is inserted.
Is heated and melted and sealed with the stem 2. Due to the heating during this sealing operation, lanthanum oxide (La ₂ O ₃ ) and aluminum oxide (Al
_The coating film made of a solid solution of ₂ O ₃ ) and boron oxide (B ₂ O ₃ ) is fired to form a protective film 51 having an ultraviolet shielding effect.

The outer bulb 11 coated with the ultraviolet shielding coating film may be baked separately to form the protective film 51.

The lamp L4 is turned on through a lighting circuit such as a ballast, and the ultraviolet light leaking from the quartz glass arc tube bulb 12 has an ultraviolet shielding function formed on the inner surface of the outer bulb bulb 11. Radiation outside the outer bulb 11 is prevented by the protective film 51 having the same.

Next, a fifth embodiment of the present invention will be described. The present invention provides the above-mentioned protective film 5 as a binder for a phosphor film 6 formed by layering on the protective film 5 such as a fluorescent lamp.
A solid solution of lanthanum oxide, aluminum oxide, and boron oxide of the same material as 51 can be used.

That is, phosphor powder, lanthanum oxide (La ₂ O ₃ ) as a binder, aluminum oxide (Al ₂ O ₃ )
₃ ) and a fine powder consisting of a solid solution of boron oxide (B ₂ O ₃ ), a water-soluble binder, an organic binder, a solvent and the like are mixed to prepare a phosphor suspension. And, for example, the first
Similarly to the ring-shaped fluorescent lamp L1 shown in the embodiment,
Lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al
This phosphor suspension is applied and dried on a protective film 5 made of a solid solution of ₂ O ₃ ) and boron oxide (B ₂ O ₃ ), and then fired to form a phosphor film 6.

The fluorescent lamp having such a protective film 5 and the phosphor film 6 is made of a lanthanum oxide (La) having both films 5, 6.
₂ O _3), since they have dense crystalline structure consisting of a solid solution of aluminum oxide (Al ₂ O ₃₎ and boron oxide (B ₂ O _3), the glass with light transmittance can be improved high light flux Since the reaction is suppressed, the luminous flux maintenance factor is not reduced and excellent luminous characteristics are obtained. In addition, since the same materials are mixed, both the coatings 5 and 6 are free from cracks, peeling, and the like, and a strong adherence is obtained. Can be

FIG. 5 shows an annular fluorescent lamp L1 according to the present invention.
FIG. 1 is a partially cutaway front view showing an example of a lighting fixture 9 using a luminaire. In the figure, reference numeral 91 denotes an appliance body, in which a lighting circuit 92 such as a fixture for attaching the appliance 9 to a building or the like, a power supply connection mechanism, a ballast, and the like is stored. A shade 93 is provided below the main body 91, and holders 94, 94,
.. Support the bulb 1 of the ring-shaped fluorescent lamp L1. In the drawing, reference numeral 95 denotes a socket mounted on the terminal of the base 7 of the fluorescent lamp L1, and reference numeral 96 denotes the socket 95 and the lighting circuit 9.
2 is a code for connecting

The fluorescent lamp L1 has a lighting circuit 92 such as a power connection mechanism, a ballast, a cord 96 and a socket 95.
And can be stably lit.

The present invention is not limited to the above-described embodiment, but may be, for example, a fluorescent lamp, a high-pressure discharge lamp, or an incandescent lamp other than those described in the embodiment. The shape of the bulb is not limited to this, and the material of the bulb can be applied from soft glass to hard glass.

As a material constituting the protective film, yttrium oxide instead of the above-mentioned lanthanum oxide exhibits the same function and effect with the same particle size and thickness, and at least one of them alone or as a mixture of both is added. Whatever is done is good.

[0062]

[Embodiment 1] The results of a comparative study of the luminous flux maintenance ratio (Table 1) and the adhesion strength of the phosphor film (Table 2) for the ring-shaped fluorescent lamp L1 of the first embodiment described above are shown below.

The fluorescent lamp L1 (FCL30EX-N / 2)
8) The protective film 5 formed on the inner surface of the valve 1 is made of lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ).
A fine powder having an average particle size of about 0.1 μm was obtained by coprecipitation at a ratio of boron oxide (B ₂ O ₃ ) of 3: 3: 4 (weight ratio), and the fine powder was dispersed in water. Suspended liquid with valve 1
After being applied and dried on the inner surface of, it was baked to form a film having a thickness of about 1 μm. Further, a phosphor film 6 of a three-wavelength emission type is formed on the protective film 5 to form a fluorescent lamp L1 (L).
Was made. In addition, the protective film 5 after this baking had a solid solution state and contained a dense crystal structure, and the coating 5 did not have cracks or peeling.

Embodiment 2 FIG. Fluorescent lamp L of the same shape as in the first embodiment
1 (FCL30EX-N / 28), the protective film 5 formed on the inner surface of the valve 1 is replaced with lanthanum oxide (La ₂ O ₃ ), yttrium oxide (Y ₂ O ₃ ), aluminum oxide 8Al ₂ O ₃ ) A fine powder was obtained by a coprecipitation method with a boron (B ₂ O ₃ ) ratio of 3: 3: 4 (weight ratio), and the same average particle diameter and film thickness as described above were obtained. Further, a fluorescent lamp L1 (Y) was manufactured by forming a three-wavelength emission type phosphor film 6 on the protective film 5 in a multilayer manner. In addition, the protective film 5 of the fluorescent lamp L1 (Y) also after firing had a solid solution state and had a dense crystal structure, and the coating film 5 did not crack or peel.

Table 1 shows the luminous flux maintenance ratio of the ring-shaped fluorescent lamps L1 (L) and L1 (Y) after 2000 hours of operation. For comparison, the protective film was made of only aluminum oxide Al ₂ O ₃ (average particle size: about 0.02 μm) for about 0.5 μm.
A conventional fluorescent lamp A formed to a thickness of μm is also shown.

Embodiment 3 FIG. The results of investigating the luminous flux maintenance factor and the coating strength of the coating applied to the ring-shaped fluorescent lamp in the fifth embodiment described above are shown below.

The fluorescent lamp L1 (FCL30EX-N / 2)
8) The protective film 5 formed on the inner surface of the valve 1 is a solid solution of lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), and boron oxide (B ₂ O ₃ ) as in the first embodiment. (With a weight ratio of 3: 3: 4) and a thickness of about 1 μm. Also, Y ₂ O ₃ : Eu (red), LaPO ₄ : C
e, Tb (green), BaMg ₂ Al ₁₆ O ₂₇ : Eu
(Blue) mixed with three-wavelength emission type phosphor powder, lanthanum oxide (La ₂ O ₃ ), aluminum oxide (Al
₂ O ₃₎ and a solid solution of boron oxide (B ₂ O ₃₎ (weight ratio 3: 3: and a binder consisting of 4 ones), BaO · C
aO.B ₂ O ₃ is mixed to form a phosphor suspension, and a phosphor film 6 having a thickness of about 1 μm is formed on the protective film 5 to form a fluorescent lamp L1 (P). did. Note that both films 5 and 6 contained a dense crystal structure, and no cracks or peeling occurred in the protective film 5 and the phosphor film 6.

For comparison, the protective film was formed of aluminum oxide (Al ₂ O ₃ ) and alkaline earth metal borate (BaO).
B ₂ O ₃ ) (with a weight ratio of 50:50) to a thickness of about 0.5 μm, and the phosphor film is formed of the above-mentioned three-wavelength phosphor powder and alkaline earth metal borane. BaO salt
・ CaO ・ B ₂ O ₃ (weight ratio 20:20:60)
Then, a phosphor solution was prepared by mixing a binder consisting of: and a phosphor film having a thickness of about 20 μm was formed on the protective film to form a fluorescent lamp B.

[0069]

[Table 1]

As shown in Table 1, the fluorescent lamps L1 (L) (Example 1) and L1 (Y) (Example 2) according to the present invention.
And the luminous flux maintenance rate (%) of L1 (P) (Example 3) is about 92 to 93% after 2,000 hours of lighting, which is about 3 to 4% improvement compared to the conventional fluorescent lamps A and B. Was.

Further, the total light value at the initial stage of lighting (after 100 hours) is also L1 (L) (Example 1) and L1 (L1) according to the present invention.
The fluorescent lamps of (Y) (Example 2) and L1 (P) (Example 3) showed an improvement of 1-2% as compared with the conventional lamp.

Further, in order to examine the adhesion strength of the phosphor film 6, the outer area at the center of the bulb 1 was hit with a piano wire having a diameter of about 1.0 mm, and the peeling area (mm ² ) of the phosphor film 6 was measured. . Table 2 shows the results.

[0073]

[Table 2]

From Table 2, it can be seen that the lamps L1 (L), L1
(Y) and L1 (P) had smaller peeling areas than the conventional lamps A and B, and it was confirmed that the adhesion strength of the phosphor film 6 could be greatly improved.

[0075]

According to the first aspect of the present invention, when applied to various protective films of a tube, it has a high light transmittance and a high shielding property for foreign substances, and even if the film thickness is large, cracks or cracks are generated. It is possible to provide a bulb having a high light emission characteristic and a high luminous flux maintenance rate without occurrence of peeling or the like.

According to the second and third aspects of the present invention, there is provided a fluorescent lamp having high light emission characteristics and a high luminous flux maintenance ratio without cracking or peeling of the phosphor film on the protective film. Can be provided.

According to the fourth aspect of the present invention, the same effects as described in the first or second aspect can be obtained by applying the present invention to an ultraviolet shielding film of a high pressure discharge lamp having a double tube structure.

According to the fifth aspect of the present invention, it is possible to prevent a decrease in the strength of the coating film and the valve at the bent portion of the valve and to prevent the occurrence of cracks and peeling.

According to the sixth aspect of the invention, the same effect as described in the first to fourth aspects can be obtained by regulating the thickness of the film.

According to the first aspect of the present invention applied to an ultraviolet shielding film of a high pressure discharge lamp and the like, the protective film has a dense crystal structure and has a light transmitting property. As a result, cracks and peeling do not occur even if the film thickness is increased.

Further, according to the invention described in claim 8,
Since the tube having the effects described in the first to seventh aspects is mounted, there is an advantage that it is possible to provide illumination that maintains a high luminous efficiency and has a high initial luminous flux and a small decrease in the luminous flux after lighting.

[Brief description of the drawings]

FIG. 1 shows a ring-shaped fluorescent lamp according to a first embodiment of the present invention, in which FIG. 1 (a) is a front view, and FIG. 1 (b) is a partial cross-sectional front view in which the vicinity of an end of the lamp is enlarged.

FIG. 2 is a partially cutaway front view showing a substantially U-shaped fluorescent lamp according to a second embodiment of the present invention;

FIG. 3 is a cross-sectional front view showing a part of a rapid start type straight tube fluorescent lamp according to a third embodiment of the present invention, which is cut away and enlarged.

FIG. 4 is a cross-sectional front view showing a part of a high-pressure discharge lamp according to a fourth embodiment of the present invention in a cutaway manner and enlarged.

FIG. 5 is a sectional front view showing a lighting fixture using the ring-shaped fluorescent lamp according to the first embodiment of the present invention, partially cut away.

[Explanation of symbols]

 L1, L2, L3: fluorescent lamp (tube) L4: high-pressure discharge lamp (tube) L5: arc tube 1: glass bulb 11: outer bulb (glass bulb) 2: stem 3: discharge electrode 5: protective film 51 : Protective film (ultraviolet shielding film) 6: Phosphor film 8: Transparent conductive film 9: Lighting equipment

Claims (8)

[Claims] 1. A glass bulb; a light emitting means provided in the interior of the bulb; and at least one of lanthanum oxide or yttrium oxide and aluminum oxide and boron oxide formed on the inner surface of the bulb. And a protective film. 2. A glass bulb; a light emitting means provided on the bulb; a discharge sustaining medium sealed in the bulb; and at least one of lanthanum oxide and yttrium oxide formed on the inner surface of the bulb. A tube comprising: a protective film composed mainly of aluminum and boron oxide; and a phosphor film formed on the protective film. 3. A glass bulb; a light emitting means provided on the bulb; a discharge sustaining medium sealed in the bulb; and at least one of lanthanum oxide or yttrium oxide formed on the inner surface of the bulb. A protective film mainly composed of aluminum and boron oxide; and a protective film laminated on this protective film and comprising a phosphor powder mainly composed of at least one of lanthanum oxide or yttrium oxide and aluminum oxide and boron oxide. A phosphor film formed by adding and mixing an adhesive. 4. An arc tube in which a discharge sustaining medium is sealed and discharge electrodes are provided facing each other; an outer bulb containing the arc tube; and an inner surface portion of the outer bulb directly or indirectly. A tube comprising: a protective film mainly formed of at least one of lanthanum oxide or yttrium oxide and aluminum oxide and boron oxide. 5. The bulb according to claim 1, wherein the glass bulb or the arc tube is bent. 6. The bulb according to claim 1, wherein said protective film has a thickness of 0.5 to 3 μm. 7. The bulb according to claim 1, wherein lanthanum oxide, yttrium oxide, aluminum oxide, and boron oxide forming the protective film are a solid solution. 8. A device main body; a tube according to any one of claims 1 to 7 mounted on the device main body; and a lighting circuit for lighting the tube. Lighting equipment featuring.