JP2000348675A - Fluorescent lamp and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow sufficient trap of carbon dioxide by guiding lithium zirconate as a getter into a translucent discharge container. SOLUTION: A metal ring 4 is formed by bending a nickel plate annularly, and is supported at a position for surrounding the periphery of an electrode 3 by welding it with an anchor wire 1d. The outer surface of the metal ring 4 carries lithium zirconate 5 comprising micro particles with 0.01-1 μm average grain size. The inner surface of the metal ring 4 carries titan mercury. A high frequency magnetic field is applied to the metal ring 4 from outside, and the metal ring 4 is heated by electromagnetic induction to activate the lithium zirconate 5. The lithium zirconate provides especially high carbon dioxide absorbing action at high temperature, for example more than 500 deg.C. Lithium zirconate micro particles may be applied onto the surface of a phosphor particle 2a in a phosphor layer, and the lithium zirconate may be impregnated into a protective film formed on the inner surface of a translucent discharge container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fluorescent lamp and a lighting device using the same.

[0002]

2. Description of the Related Art In order to improve the characteristics of a fluorescent lamp, it is important to reduce the amount of impurity gas in the translucent discharge vessel. For this purpose, various measures have been taken such as increasing the degree of vacuum at the time of evacuation and providing an impure gas getter such as alumina-zirconia inside the translucent discharge vessel.

However, the conventional impure gas getter has not always had a sufficient ability to capture carbon dioxide, which is the largest impurity gas generated in the manufacturing process.

An object of the present invention is to provide a fluorescent lamp configured to sufficiently capture carbon dioxide and an illuminating device using the fluorescent lamp.

[0004]

According to the first aspect of the present invention, there is provided a fluorescent lamp comprising: a light-transmitting discharge vessel; a phosphor layer formed on an inner surface of the light-transmitting discharge vessel; , A pair of electrodes sealed in the light-transmitting discharge vessel, and an ionizing medium sealed in the light-transmitting discharge vessel; and lithium zirconate introduced into the light-transmitting discharge vessel.

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

<Translucent Discharge Vessel> The translucent discharge vessel may have any shape and structure, but preferably has an elongated tube portion having a tube diameter of about 14 to 30 mm, and both ends of the tube portion are closed. End plate portion. The end plate portion is generally constituted by a stem. When a stem is used, a known stem structure such as a flare stem, a bead stem, a button stem, a pinch seal stem and the like can be employed.

[0007] The material of the translucent discharge vessel is not particularly limited as long as it has airtightness, workability and fire resistance, but soft glass such as soda lime glass generally used for this kind of fluorescent lamp is used. It is suitable. However, if necessary, glass other than soft glass such as hard glass, semi-hard glass, and quartz glass can be used. Furthermore, it does not exclude that the light-transmitting discharge vessel is formed using a light-transmitting polycrystalline or single-crystal ceramic other than glass.

The shape of the light-transmitting discharge vessel may be a desired shape such as a straight tube, a ring, a U-shape, or a W-shape.

Furthermore, a thin tube can be provided for evacuating the light-transmitting discharge vessel and enclosing the ionizing medium. That is, the thin tube has a base end air-tightly connected to the inside of the light-transmitting discharge vessel, protrudes from one end of the light-transmitting discharge vessel to the outside, and exhausts the inside of the light-tight discharge vessel through the thin tube. After the ionization medium is sealed, the chip is chipped off.

The length of the thin tube protruding from the end of the light-transmitting discharge vessel is free as long as it does not hinder the tip of the thin tube. However, by increasing the length within the allowable range,
It becomes easier to form a desired coolest part in the thin tube portion. On the other hand, as is generally used, when a base is attached to the end of a tube, if the thin tube is too long, it will hinder the installation of the base, so an appropriate length must be considered. .

It is to be noted that another thin tube may protrude outside from the other end of the light-transmitting discharge vessel, or a thin tube may not be provided at the other end of the light-transmitting discharge vessel.

<Regarding the Phosphor Layer> The phosphor layer is formed on the inner surface side of the light-transmitting discharge vessel. The phosphor layer may be formed in direct contact with the inner surface of the light-transmitting discharge vessel, or may be formed of a transparent material. This means that it may be formed via a conductive film, a protective film such as alumina, and / or a reflective film such as titanium oxide.

The phosphor used can be arbitrarily selected according to the purpose of illumination. For example, for general lighting purposes, a white light emitting phosphor such as a three-wavelength light emitting phosphor or a halophosphate phosphor can be used. For reading, a green light-emitting phosphor can be used. Further, depending on the application, an ultraviolet-emitting phosphor or the like may be used for all or a part of the phosphor.

<Regarding the Electrodes> The electrodes are sealed at both ends in the translucent discharge vessel, and a low-pressure mercury vapor discharge or a low-pressure gas discharge is generated between them.

As the electrode, a known electrode such as a filament electrode or a ceramic electrode can be used. The filament electrode has a structure in which an electron emitting material is applied to a double coil or triple coil of tungsten, and both ends of the filament electrode are connected to the tip of a pair of introduction wires that penetrate a light-transmitting discharge vessel in an airtight manner. ing. The ceramic electrode is, for example, in an electrically conductive container having an opening portion, mainly composed of an oxide of an alkaline earth element and a transition metal element, and in the form of granules, the surface of which is coated with end pieces or nitrides of the transition metal element. It has a structure in which a thermionic emission material made of sponge-like or massive composite ceramics is housed, and is supported at the tip of one introduction wire.

<Regarding Ionization Medium> The ionization medium is a discharge substance necessary for emitting ultraviolet rays by low-pressure mercury vapor discharge or low-pressure gas discharge. Ionizing media for low pressure mercury vapor discharges are mercury and noble gases.

Mercury is an ionizing medium for performing low pressure mercury vapor discharge. Mercury can be encapsulated in the form of pelletized amalgam, titanium mercury or pure mercury.

The rare gas is used for facilitating the start of discharge of the fluorescent lamp and as a buffer gas.
Krypton or the like is sealed in a translucent discharge vessel of about several hundred to 1,000 Pa.

On the other hand, the ionizing medium for the low-pressure gas discharge is a rare gas such as xenon.

<Regarding Lithium Zirconate> Lithium zirconate Li ₂ ZrO ₃ is introduced into a translucent discharge vessel as a getter for adsorbing and capturing carbon dioxide, and is preferably in the form of fine particles.

The means for introducing lithium zirconate into the translucent discharge vessel is optional, but for example, means for supporting on a shielding ring, means for supporting on a phosphor layer, means for supporting on a protective film, and the like are employed. be able to.

As the lithium zirconate, fine particles having an average particle diameter of 0.01 to 0.5 μm are preferably used.

Further, since lithium zirconate exhibits a particularly high carbon dioxide adsorption action at a high temperature, for example, 500 ° C. or higher, a part or the whole of the translucent discharge container can be temporarily used at a high temperature during lighting or at a manufacturing stage. It is desirable that the carbon dioxide be absorbed at a high temperature.

<Other Configurations> In the present invention, other conventionally used getters are allowed to be used in combination with lithium zirconate in order to capture impurity gases such as oxygen and hydrogen.

In order to obtain a rapid start type fluorescent lamp, a conductive coating is formed on the inner surface of the translucent discharge vessel, and preferably a protective coating mainly composed of metal oxide fine particles such as alumina fine particles is further formed thereon. Form a film. Then, a phosphor layer is formed on the protective film.

Further, particularly in a rapid-start fluorescent lamp or a fluorescent lamp dedicated to high-frequency lighting, a shield ring surrounding the periphery of the electrode can be provided to suppress the generation of an anode spot.

<Function of the Present Invention> In the present invention, since lithium zirconate is introduced into the translucent discharge vessel, carbon dioxide, which is the most impure gas in the fluorescent lamp, is trapped, so that excellent characteristics are obtained. A fluorescent lamp is obtained.

A fluorescent lamp according to a second aspect of the present invention includes a light-transmitting discharge vessel; a phosphor layer formed on an inner surface side of the light-transmitting discharge vessel; and a pair of light-transmitting discharge vessels sealed at both ends. An electrode; an ionizing medium containing mercury and a rare gas sealed in a light-transmitting discharge vessel; a metal ring surrounding at least one of the electrodes; and lithium zirconate supported on the metal ring. It is characterized by having.

The present invention defines an arrangement in which lithium zirconate is introduced into a translucent discharge vessel by being supported on a metal ring surrounding the periphery of the electrode.

Since the metal ring surrounds the periphery of the electrode, it can function as a so-called shield ring. In this case, the metal ring is kept in an insulating relationship with the electrodes. In a fluorescent lamp for AC lighting, a pair of electrodes alternately serve as a cathode and an anode, so a shield ring is provided for each electrode, but lithium zirconate is carried on only one of the metal rings. Just do it. However, if necessary, both metal rings can carry lithium zirconate.

If necessary, the metal ring can be filled with a predetermined amount of mercury by supporting an amalgam such as titanium mercury on one surface thereof.

Further, in order to activate the lithium zirconate carried on the metal ring, a high-frequency magnetic field is applied to the metal ring from the outside of the light-transmitting discharge vessel,
The lithium zirconate can be heated via the metal ring by electromagnetic induction. When the metal ring also supports titanium mercury, mercury can be melted and separated at the same time. The remaining titanium acts as a getter.

However, in the case of a ring-shaped fluorescent lamp, when the light-transmitting discharge vessel is formed into a ring shape, it is heated to the softening temperature of the glass. There is no need to apply a magnetic field.

The fluorescent lamp according to the third aspect of the present invention provides a light-transmitting discharge vessel; a phosphor layer containing lithium zirconate and formed on the inner surface side of the light-transmitting discharge vessel; And a pair of sealed electrodes; and an ionizing medium containing mercury and a rare gas sealed in a translucent discharge vessel.

The present invention specifies a structure in which lithium zirconate is supported on a phosphor layer.

In order to carry lithium zirconate on the phosphor layer, for example, when the phosphor is in a powder state, lithium zirconate in a fine particle state is well dusted and adhered to the periphery of the phosphor particles. When a phosphor slurry is prepared using such a phosphor and flows down to the inner surface side of the translucent discharge vessel and is fired to produce a phosphor layer, the lithium zirconate is dispersed well and the phosphor is dispersed. Attached to body particles.

On the other hand, when preparing the phosphor slurry, fine particles of lithium zirconate may be suspended in the phosphor slurry. In this case, the manufactured phosphor layer tends to have a structure in which lithium zirconate is aggregated between the phosphor particles. However, there is no problem with the getter action of lithium zirconate on carbon dioxide.

The ratio of lithium zirconate contained in the phosphor layer is 0.001 to 2% by weight, preferably 0.00
5 to 0.5% by weight.

In the present invention, fine particles of a metal oxide such as alumina can be added in addition to lithium zirconate. These additives are generally 0.1 to 5% by weight, preferably 0.1 to 1% by weight, based on the phosphor. If the addition amount is too large, the film surface of the phosphor layer becomes rough and the luminous flux decreases.

By including fine particles of a metal oxide such as alumina or magnesia in the phosphor layer, mercury is less likely to adhere to the phosphor layer, and a rapid discharge having a transparent conductive coating on the inner surface of the light-transmitting discharge vessel. The start-type fluorescent lamp is effective in preventing so-called EC blackening.

That is, EC blackening is a phenomenon that is observed in a rapid start type fluorescent lamp having a transparent conductive film on the inner surface of a translucent discharge vessel, and is caused by mercury particles adhering to the transparent conductive film and the phosphor layer. The phosphor is discolored by the slight discharge generated during the period. This EC blackening is likely to occur when air is directly blown from the air conditioning equipment onto the fluorescent lamp to cool the tube wall, and mercury is likely to adhere.

On the other hand, measures to increase the resistance value of the transparent conductive film and disperse fine particles of a metal oxide such as alumina and magnesia in the phosphor layer have been considered.

However, if the resistance value of the transparent conductive film is too high, there is a problem that the starting voltage becomes too high.

Further, even if the resistance value is high at the time of lighting, the transparent conductive film is reduced by the irradiation of ultraviolet rays during lighting and the resistance value is reduced, resulting in the occurrence of EC blackening. There is.

On the other hand, as a measure to disperse fine particles of a metal oxide such as alumina or magnesia in the phosphor layer, the affinity between the phosphor and mercury is deteriorated, and as a result, mercury does not easily adhere to the surface of the phosphor. Become. For this reason, EC blackening hardly occurs.

However, since the fine particles of the metal oxide easily adsorb carbon dioxide, when a fluorescent lamp is manufactured, the carbon dioxide adsorbed and remaining inside the translucent discharge vessel is released, and when the lamp is turned on, it emits sunlight. There is a problem that the probability of occurrence of abnormal discharge, such as snaking, meandering inside, increases.

Therefore, in the present invention, carbon dioxide is captured well by adding lithium zirconate in addition to the fine particles of the metal oxide, so that deterioration of the characteristics can be prevented.

When the metal oxide fine particles are added together with lithium zirconate, the fine particles may be sprayed in advance at the phosphor powder stage, or may be suspended when preparing the phosphor slurry.

Thus, in the present invention, since lithium zirconate is contained in the phosphor layer, it is not necessary to provide any special support means, and therefore, the structure can be prevented from becoming complicated.

Further, in order to activate the lithium zirconate, it is necessary to heat it to a high temperature, but it is sufficient to heat the entire light-transmitting discharge vessel. Since the ring-shaped fluorescent lamp is heated to the softening temperature of the glass in order to form it into a ring, the lithium zirconate can be activated at that time. It is.
However, even in the case of a straight tube fluorescent lamp, lithium zirconate can be activated by providing a heating step, and thus has the effect of the present invention.

According to a fourth aspect of the present invention, there is provided a fluorescent lamp comprising: a light-transmitting discharge vessel; a protective film containing lithium zirconate and formed on an inner surface of the light-transmitting discharge vessel; and a phosphor formed on the protective film. And a pair of electrodes sealed at both ends of the light-transmitting discharge vessel; and an ionization medium containing mercury and a rare gas sealed in the light-transmitting discharge vessel.

The present invention defines a structure in which lithium zirconate is supported on a protective film.

The protective film is used for preventing so-called solarization, in which mercury ions enter the light-transmitting discharge vessel and disappear and are depleted of mercury in the discharge space or coloring of the glass.

As the constituent material of the protective film, fine particles of a metal oxide such as alumina or an oxide of a titanium-zinc alloy can be used.

Further, the addition amount of lithium zirconate is generally 1 to 20% by weight, preferably 1 to 10% by weight based on the material of the protective film.

Thus, also in the present invention, no special structure is required for introducing lithium zirconate into the translucent discharge vessel, so that the structure can be prevented from becoming complicated.

Further, the effect of lithium zirconate for capturing carbon dioxide does not decrease.

According to a fifth aspect of the present invention, there is provided a lighting device comprising: a lighting device main body; and the fluorescent lamp according to any one of the first to fourth aspects supported by the lighting device main body. .

In the present invention, the “illumination device” is a broad concept including any device that uses the light emitted from a fluorescent lamp for some purpose. Illustrating lighting devices, lighting equipment,
Examples include an image reading device, a backlight device such as a liquid crystal device, a display device, and a signal light device.

The lighting equipment is suitable for household lighting equipment, but is not limited thereto, and is also applicable to store lighting equipment, office lighting equipment, outdoor lighting equipment and the like.

It is to be noted that, for example, OA equipment such as a copying machine, a facsimile, and a scanner, and information processing equipment such as a personal computer, which incorporate an image reading device, are also included in the lighting device.

The "illumination device main body" means the remaining portion of the illumination device excluding the fluorescent lamp.

[0063]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway front view showing a fluorescent lamp dedicated to high frequency lighting as a first embodiment of the fluorescent lamp of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a main part in the same manner.

FIG. 3 is an enlarged cross-sectional view of the same.

In each figure, 1 is a translucent discharge vessel, 2 is a phosphor layer, 3 is an electrode, 4 is a metal ring, 5 is lithium zirconate, 6 is titanium mercury, and 7 is a base.

In this embodiment, the pipe diameter is 25.5 mm and the pipe length is 1
It is a 198 mm straight tube fluorescent lamp. However, the filling gas is about 300 Pa of Ar.

The translucent discharge vessel 1 is constituted by sealing a pair of stems 1b at both ends of a glass tube 1a.

The pair of stems 1b is formed of a flare stem, and a pinch seal portion 1b1,
A flare portion 1b2 is formed at the other end. A pair of introduction wires 1c penetrate the pinch seal portion 1b1 in an airtight manner, and the base end of the anchor wire 1d is buried between the pair of introduction wires 1c.

Each stem 1b is connected to a thin tube 1b.
3 is provided. The thin tube 1b3 is welded at its base end adjacent to the pinch seal portion 1b1 and communicates with the inside of the light-transmitting discharge vessel 1, and its tip protrudes outside from the flare portion 1b2. After the gas is exhausted and the rare gas of the ionization medium is filled, the chip is cut off.

The phosphor layer 2 has a three-wavelength light emitting phosphor as a main component, and is formed on the inner surface of the translucent discharge vessel 1.

The electrode 3 is composed of a filament electrode, and both ends thereof are connected between the tips of a pair of introduction wires 1c of the stem 1b.

The metal ring 4 is formed by bending a nickel plate in an annular shape, and is supported by being welded to the anchor wire 1 d at a position surrounding the periphery of the electrode 3.

The lithium zirconate 5 has an average particle size of 0.3.
It is made of fine particles having a size of from 1 to 1 μm, and is supported on the outer surface of the metal ring 4.

The titanium mercury 6 is carried on the inner surface of the metal ring 4.

The lithium zirconate 5 is activated by applying a high-frequency magnetic field to the metal ring 4 from the outside and heating the metal ring 4 by electromagnetic induction.

At the same time, mercury evaporates from titanium mercury and becomes an ionizing medium.

The base 7 is attached to both ends of the translucent discharge vessel 1 by bonding, and has a base pin 7 a to which a lead wire 1 c supporting each electrode 3 is connected.

FIG. 4 is an enlarged vertical sectional view of a main part of a rapid start type fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention.

In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description is omitted.

This embodiment is different from the first embodiment in that a transparent conductive film 8 and a protective film 9 are provided, and the phosphor layer 2 contains lithium zirconate 5 and alumina 10.

That is, a transparent conductive film 8 and a protective film 9 mainly composed of alumina fine particles are sequentially formed on the inner surface of the translucent discharge vessel 1.

In the phosphor layer 2, fine particles of lithium zirconate 5 and fine particles of alumina 10 are dispersed and adhered to the surface of the phosphor particles 2a. In order to form such a phosphor layer 2, a phosphor slurry is prepared by using fine particles of lithium zirconate 5 and alumina 10 which have been previously coated on the phosphor particles 2a, and the slurry flows down into a glass tube. What is necessary is just to bake after drying.

FIG. 5 is an enlarged longitudinal sectional view of a main part of a rapid start type fluorescent lamp as a third embodiment of the fluorescent lamp of the present invention.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and the description is omitted.

This embodiment is different in that fine particles of lithium zirconate 5 and magnesia 11 are aggregated between phosphor particles. However, the sealed gas is about 320 Ar
Pa.

That is, when preparing the phosphor slurry, the phosphor slurry obtained by suspending the fine particles of lithium zirconate 5 and magnesia 11 is allowed to flow down into a glass tube, dried, and fired to form the phosphor layer 2. When formed, the fine particles of lithium zirconate and magnesia 11 aggregate between the phosphor particles.

FIG. 6 is a front view, partially cut away and partially sectioned, showing a ring-shaped fluorescent lamp as a fourth embodiment of the fluorescent lamp of the present invention.

FIG. 7 is an enlarged longitudinal sectional view of a relevant part.

In each figure, the same parts as those in FIGS. 2 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is different in that a protective film 9 is formed on the inner surface of the translucent discharge vessel 1 and the protective film 9 contains the lithium zirconate 5. In FIG. 6, the protective film is omitted.

That is, the light-transmissive discharge vessel 1 is substantially annularly curved, and bases 7 ′ are attached to the two ends of the light-transmissive discharge vessel 1 at the missing portions of the rings, so that the fluorescent lamp as a whole is formed in an annular shape. ing.

As shown in FIG. 7, the protective film 9 formed on the inner surface of the translucent discharge vessel 1 contains fine particles of alumina 10 as a main component and fine particles of lithium zirconate 5 dispersed therein. .

The phosphor layer 2 is formed on the protective film 9.

In order to curve the translucent discharge vessel 1 in an annular shape,
A straight tubular glass tube 1a is prepared, and a protective film 9 is formed on its inner surface.
Is formed, then the phosphor layer 2 is applied, the protective film 9 and the phosphor layer 2 at both ends of the glass tube are removed, and then the binder is decomposed by heating in a baking step to decompose the protective film 9 and the phosphor. The layer 2 is fired.

Next, an electrode mount formed by connecting the electrodes 3 is welded to both ends of the glass tube, and both ends are heated and formed to form an annular groove 1e. And the translucent discharge vessel 1
Is heated and softened in a heating furnace, and the annular concave groove 1e at one end is gripped and fixed, and the annular concave groove 1e at the other end is gripped by a rotating drum and wound up on the rotating drum, whereby the translucent discharge vessel 1 is removed. Curve annularly.

Finally, the base 7 'is attached to the missing portion of the ring to make the whole fluorescent lamp ring-shaped.

In the above manufacturing process, when the translucent discharge vessel 1 is heated to 700 ° C. or more in the heating furnace when being bent in an annular shape, the lithium zirconate 5 in the protective film 9 is activated and carbon dioxide is removed. To capture.

FIG. 8 is a perspective view showing a ceiling-mounted lighting fixture as one embodiment of the lighting device of the present invention.

In the figure, 11 is a reflector, 12 is a straight tube fluorescent lamp, 13 is a lamp socket, and 14 is a discharge lamp lighting device.

The reflection plate 11 is formed by press-molding a metal plate, and its surface is painted white.

The straight tube type fluorescent lamp 12 is disposed below the reflector 11, and the bases at both ends have a pair of lamp sockets 13.
It is supported by being mounted in between.

The lamp socket 13 is provided on the reflection plate 11.

The discharge lamp lighting device 14 is housed inside the reflection plate 11 and energizes and lights the straight tube type fluorescent lamp 12 via the lamp socket 13.

[0106]

According to the first to fourth aspects of the present invention, a phosphor layer is formed on the inner surface side, a pair of electrodes are sealed at both ends, and an ionizing medium is sealed inside. Since lithium zirconate is introduced into the inside of the discharge vessel, it is possible to provide a fluorescent lamp having excellent characteristics by capturing carbon dioxide, which is the largest among the impurity gases generated in the manufacturing process.

According to the second aspect of the present invention, in addition, the lithium zirconate is supported on the metal ring surrounding at least one of the electrodes, so that the lithium zirconate can be formed while the metal ring acts as a so-called shield ring. It is possible to provide a fluorescent lamp whose structure is simplified by carrying it.

According to the third aspect of the present invention, in addition to the lithium zirconate supported on the phosphor layer, a fluorescent lamp capable of satisfactorily capturing carbon dioxide without a special structure for supporting the lithium zirconate. In addition, since it can be included in the phosphor layer together with fine particles of a metal oxide such as alumina, which makes the affinity with mercury worse, the occurrence of snaking can be reduced while suppressing the occurrence of EC blackening. A fluorescent lamp suitable for a rapid start type fluorescent lamp can be provided.

According to the fourth aspect of the present invention, in addition to the lithium zirconate included in the protective film, the fluorescent lamp can capture carbon dioxide satisfactorily without a special structure for supporting lithium zirconate. In addition, since the lithium zirconate can be activated by heating when the ring-shaped fluorescent lamp is curved, a fluorescent lamp suitable for a ring-shaped fluorescent lamp can be provided.

According to the invention of claim 5, it is possible to provide a lighting device having the effects of claims 1 to 4.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a fluorescent lamp dedicated to high frequency lighting as a first embodiment of a fluorescent lamp of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the same.

FIG. 3 is an enlarged cross-sectional view of the same.

FIG. 4 is an enlarged vertical sectional view of a main part showing a rapid start type fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention;

FIG. 5 is an enlarged vertical sectional view of a main part showing a rapid start type fluorescent lamp as a third embodiment of the fluorescent lamp of the present invention.

FIG. 6 is a partially cutaway partially sectional front view showing an annular fluorescent lamp as a fourth embodiment of the fluorescent lamp of the present invention.

FIG. 7 is an enlarged longitudinal sectional view of a main part of the same.

FIG. 8 is a perspective view showing a ceiling-mounted lighting fixture as an embodiment of the lighting device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Translucent discharge container 1a ... Soft glass tube 1b ... Stem 1b1 ... Pinch seal part 1b2 ... Flare part 1b3 ... Thin tube 1c ... Lead wire 1d ... Anchor wire 2 ... Phosphor layer 3 ... Electrode 4 ... Metal ring 5 ... Lithium Zirconate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadashi Kobori F-term in Toshiba Litec Co., Ltd. 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo 5C015 TT07 TT13

Claims (5)

[Claims] A light-transmitting discharge vessel; a phosphor layer formed on an inner surface side of the light-transmitting discharge vessel; a pair of electrodes sealed at both ends of the light-transmitting discharge vessel; And a lithium zirconate introduced into a translucent discharge vessel. 2. A light-transmitting discharge vessel; a phosphor layer formed on an inner surface side of the light-transmitting discharge vessel; a pair of electrodes sealed at both ends of the light-transmitting discharge vessel; A fluorescent material comprising: an ionizing medium containing mercury and a rare gas enclosed in a metal ring; a metal ring surrounding at least one electrode; and lithium zirconate carried on the metal ring. lamp. 3. A light-transmitting discharge vessel; a phosphor layer containing lithium zirconate formed on an inner surface side of the light-transmitting discharge vessel; a pair of electrodes sealed at both ends of the light-transmitting discharge vessel;
An ionizing medium containing mercury and a rare gas sealed in a translucent discharge vessel. 4. A light-transmitting discharge vessel; a protective film containing lithium zirconate and formed on an inner surface of the light-transmitting discharge vessel; a phosphor layer formed on the protective film; And a pair of electrodes sealed at both ends of the fluorescent lamp; and an ionizing medium containing mercury and a rare gas sealed in a translucent discharge vessel. 5. A lighting device body; and the fluorescent lamp according to claim 1 supported by the lighting device body;
A lighting device, comprising: