JP2005209664A - Fluorescent lamp and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of controlling mercury vapor pressure so as not to lower the emission efficiency in either of a low-temperature area and a high-temperature area. <P>SOLUTION: The fluorescent lamp comprises: at least a pair of straight-line portions 1a, 1b having a length of 1,000 mm or more and extending in proximity to each other; a communicating part 1b for allowing the pair of straight-line portions 1a, 1b to communicate with each other at one of ends thereof; and a pair of electrodes 2, 2 sealed at a position located on the side of the other ends of the pair of straight-line portions 1a, 1b and at a distance T from those other ends. The fluorescent lamp further comprises: a translucent discharge vessel 1 disposed to satisfy 0.5T≤H≤4T where H is the distance from one of the ends of each of the straight-line portions 1a, 1b to a center of a discharge path of the communicating part 1b; a phosphor layer 4 formed on an inner surface of the translucent discharge vessel 1; and a rare gas enclosed in the translucent discharge vessel 1. Since the coolest portion is formed in the translucent discharge vessel 1 on the side of the one of the ends of each of the straight-line portions 1a, 1b, it is possible to allow a flux of light to rise rapidly at the start of lighting. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluorescent lamp referred to as a compact fluorescent lamp and a bulb-type fluorescent lamp.

  In recent years, fluorescent lamps have been miniaturized due to environmental problems. In particular, bulb-type fluorescent lamps and compact fluorescent lamps tend to be miniaturized, and because they are lit at a high output without changing the lamp power, the load on the tube wall is increasing accordingly.

  When the tube wall load increases, the lamp temperature during lighting rises and the mercury vapor pressure becomes too high, resulting in a decrease in luminous efficiency.To avoid this, the optimum mercury can be obtained even at high temperatures by encapsulating amalgam. Designed to exhibit vapor pressure. As the tube wall load increases, it is necessary to use an amalgam having a low mercury vapor pressure, that is, a high mercury vapor pressure control capability.

  However, when an amalgam having a high mercury vapor pressure control ability is used, there is a problem that the luminous efficiency is lowered when the lamp is lit in an environment as low as 25 ° C. or less.

  FIG. 5 is a graph showing the relationship between the ambient temperature and the luminous efficiency of the fluorescent lamp. In the graph, line a represents a fluorescent lamp of the coldest part control system in which pure mercury is enclosed and the mercury vapor pressure is controlled by the coldest part temperature at the lowest temperature in the bulb formed in the non-discharge region of the bulb formation. The luminous efficiency is shown. Moreover, line b shows the luminous efficiency of the fluorescent lamp of the amalgam control system in which an amalgam having an amalgam temperature of 25 ° C. and a mercury vapor pressure of 0.1 Pa or less is enclosed. The ambient temperature indicates the temperature around the fluorescent lamp, and is defined as the temperature inside the fixture when the fluorescent lamp is lit in the fixture.

  As can be seen from FIG. 5, the luminous efficiency of the lamp shows a mountain shape with the peak temperature as the apex, and the luminous efficiency decreases around the peak temperature of about 25 ° C. in the coldest part control method a and about 50 ° C. in the amalgam control method b. . In other words, the coldest part control method has a low luminous efficiency in a high temperature environment, and the amalgam control method has a low luminous efficiency at a low temperature (25 ° C. or less). Therefore, the fluorescent lamp is mercury vapor according to the ambient temperature of the environment in which it is used. It is necessary to select a pressure control method.

  On the other hand, Japanese Patent Application Laid-Open No. 58-142754 discloses a coldest part control type fluorescent lamp having a discharge bulb in which one end sides of a pair of linear portions are communicated by a connecting tube. In this conventional fluorescent lamp, in order to reliably form the coldest part on the other end side of the linear part where the electrode is sealed, the distance from the other end of the linear part to the electrode is 2.0 to 2.0 mm of the inner diameter of the linear part. It is defined to be within the range of 4.0 times.

  However, in the above conventional fluorescent lamp, the coldest part is formed on the other end side of the linear part, so in the case of the fluorescent lamp whose linear part has a length exceeding 1000 mm, all the mercury condensed in the coldest part is completely removed. Since it takes time to diffuse into the discharge space, there is a problem that it is difficult for the luminous flux to rise at the start of lighting.

  On the other hand, Japanese Patent Publication No. 1-51852 discloses a fluorescent lamp in which a non-discharge space is formed on one end side of a straight portion and the coldest portion is formed in this region. In this conventional fluorescent lamp, in order to reliably form the coldest part in the non-discharge space formed on one end side of the straight portion from the connecting tube, the distance from one end of the straight portion to the center of the connecting tube is It is defined to be within a range of 1 to 4 times the inner diameter.

  However, since the conventional fluorescent lamp does not consider the electrode arrangement position, the coldest part may be formed on the other end side of the linear part depending on the electrode arrangement position, and the characteristics are unstable. Met.

  The present invention has been made in view of the above problems, and the fluorescent lamp capable of controlling the mercury vapor pressure and the coldest part at a desired position so that the luminous efficiency is not impaired in both low and high temperature regions. An object of the present invention is to provide a fluorescent lamp having a good rise at the start of lighting and a lighting fixture having these fluorescent lamps so as to be surely formed.

  The fluorescent lamp according to claim 1 has at least a pair of linear portions that are close to each other with a length of 1000 mm or more, a communication portion that communicates the pair of linear portions at one end side thereof, and the other end side of the pair of linear portions. And a pair of electrodes sealed at a position where the distance from the other end is T, and the communication portion is 0.5T ≦ when the distance from one end of the straight portion to the discharge path center of the communication portion is H A translucent discharge vessel disposed in a relationship of H ≦ 4T; a phosphor layer formed on the inner surface side of the translucent discharge vessel; and a rare gas sealed inside the translucent discharge vessel; It is characterized by having.

  In the invention of claim 1, the definition and technical meaning of terms are as follows unless otherwise specified.

  The shape of the translucent discharge vessel is arbitrary as long as the inner diameter of the tube is 18 mm or less and has a pair of straight portions. For example, straight pipe, U-shape, W-shape, 3 or 4 U-shaped portions connected in series and U-shaped portions stacked on top of each other, or U-shaped portions equally arranged on the circumference, etc. Allow to be.

  The “U-shape” means that two straight portions are communicated with each other by a communicating portion, and the discharge path formed as a result is bent so as to be folded back. May be close to each other or may be spaced apart. Therefore, one straight pipe may be bent or molded after being bent, or one end of two straight pipes arranged in parallel adjacent to each other may be connected by a connecting pipe or a blow-break method or molding. It may be formed in a U shape. Further, the communicating part of the two straight portions is allowed to have a so-called H-shape, U-shape, U-shape, narrowed shape, or the like. Further, the communication part may have an arbitrary shape such as a circular or elliptical cross section.

  In the present invention, the reason why the inner diameter of the translucent discharge vessel is specified to be 18 mm or less is that most of the fluorescent lamps with a small and high tube wall load that are lit at a high temperature have an inner diameter of 18 mm or less.

  The material of the translucent discharge vessel is not particularly limited as long as it has airtightness, workability and fire resistance, but soft glass generally used for this kind of fluorescent lamp is suitable.

  The electrodes are arranged in the vicinity of both ends inside the translucent discharge vessel and form a discharge path together with the translucent discharge vessel.

  A discharge path means the distance between the electrodes of a translucent discharge vessel. The discharge path may be either linear or curved. Moreover, the measurement standard of the discharge path length in the part where the discharge path is bent depends on the center of the effective light emitting part.

  Moreover, a filament electrode, a ceramic electrode, etc. can be used for an electrode.

  Furthermore, in order to seal the electrodes at both ends of the translucent discharge vessel, an appropriate means such as a flare stem, a pinch seal stem, or a button stem can be used.

  The phosphor layer may be formed in contact with the inner surface of the translucent discharge vessel, or may be formed through a protective film such as alumina and / or a reflective film such as titanium oxide.

  Moreover, the fluorescent substance to be used can be arbitrarily selected according to the illumination purpose. For example, for general lighting applications, a white light-emitting phosphor such as a three-wavelength phosphor or a halophosphate phosphor can be used. Depending on the application, an ultraviolet light-emitting phosphor can be used.

  The rare gas is used for facilitating the start of the discharge of the fluorescent lamp, and argon, neon, krypton, etc. are enclosed in a translucent discharge vessel of about several hundred Pa.

  As the amalgam, for example, one exhibiting a mercury vapor pressure of 0.1 Pa or less when the amalgam temperature is 25 ° C. is used. Examples of the amalgam having mercury vapor pressure characteristics include bismuth (Bi) -indium (In) -mercury (Hg), bismuth (Bi) -lead (Pb) -tin (Sn) -mercury (Hg), bismuth ( Bi) -indium (In) -tin (Sn) -mercury (Hg), bismuth (Bi) -tin (Sn) -mercury (Hg), and the like, but are not limited thereto. It goes without saying that the amalgam is selected and used with mercury vapor pressure characteristics suitable for the temperature at which the fluorescent lamp is lit. Further, an auxiliary amalgam made of indium (In) or the like in combination with the amalgam can be disposed in the vicinity of the electrode.

  The amalgam is disposed, for example, at a position where the distance from the electrode is 40 mm or less, and is enclosed in, for example, a thin tube provided in the translucent discharge vessel. In this case, the amalgam can be formed into a spherical shape to facilitate introduction into the narrow tube. The capillary tube has a proximal end hermetically connected to the translucent discharge vessel, protrudes from the translucent discharge vessel to the outside, and is sealed at the distal end. The disposition position of the thin tube with respect to the light-transmitting discharge vessel may be a stem in which the electrode at the end is sealed, or may be located in the middle of the discharge path irrespective of the electrode. Furthermore, the thin tube can function to exhaust the inside of the translucent discharge vessel or enclose a rare gas, but if necessary, it can function only to enclose the amalgam described later. Good. Furthermore, it is possible to fix the amalgam by forming a neck portion in the middle portion of the thin tube.

  As long as the amalgam is disposed at a position where the distance from the electrode is 40 mm or less, the amalgam may freely move inside the translucent discharge vessel.

  The communication part is mainly configured in the following two forms.

  (1) Blow one end side of the straight portion and connect the blown portions to form a communication pipe having an inner diameter equal to or less than the inner diameter D of the pipe.

  (2) A communicating portion having an inner diameter equal to or larger than the inner diameter D of the pipe is formed by bending one straight pipe in the middle.

  (3) One straight pipe is bent in the middle and then molded or blown off at one end of the straight portion, and the blown portion is connected and molded to form a communicating portion having an inner diameter equal to or greater than the inner diameter D of the pipe. To do.

  In the case where the communication portion is in the form (1), the communication portion is disposed in a relationship of D ≦ H ≦ 4D when the distance H from one end of the linear portion to the discharge path center of the communication portion is set.

  If H is less than D, the non-discharge region formed on one end side of the straight line portion becomes small, and the coldest part for controlling the mercury vapor pressure is not formed on one end side of the straight line portion. Since the area becomes too large, the fluorescent lamp becomes large, which is not preferable.

  When the communicating part is in the form of (2) or (3), the communicating part is formed by bending or molding one end side of the linear part so that the inner diameter becomes D or more, and the maximum inner diameter of the communicating part When L is L, the relationship is 1.2D ≦ L ≦ 4D.

  When L is less than 1.2D, the non-discharge region formed on one end side of the straight line portion becomes small, and the coldest part for controlling the mercury vapor pressure is not formed on one end side of the straight line portion, but exceeds 4D. Since the non-discharge region becomes too large, the fluorescent lamp becomes large, which is not preferable.

  By configuring the communication portion in this way, the coldest portion is formed in the non-discharge region. In addition, since the amalgam is always disposed at a position that is affected by heat from the electrodes, the temperature of the amalgam is considerably higher than the coldest part temperature even at a low temperature.

  Therefore, the mercury vapor pressure is lower in the coldest part at low temperatures, and the lamp is lit with the mercury vapor pressure characteristic of pure mercury. However, since the mercury vapor pressure in the coldest part rises at high temperatures, the mercury vapor pressure of amalgam is lower and the lamp is lit with the mercury vapor pressure characteristic of amalgam. As described above, the fluorescent lamp of the present invention can be lit with the mercury vapor pressure characteristics of the coldest part at a low temperature and amalgam at a high temperature, and can be lit with a mercury vapor pressure with good luminous efficiency.

  In the invention of claim 1, the length from one end to the other end of the linear portion of the translucent discharge vessel is 1000 mm or more.

  Further, in claim 1, it means that the two straight portions are communicated by the communicating portion, and the discharge path formed as a result is bent so that one end of the two straight portions is formed. The sides are connected to each other by a connecting pipe, a blow-through method, or molding to form a U-shape. The communicating portion may have an arbitrary shape such as a circular or elliptical cross section.

  It is desirable that the electrode be disposed so that the distance T from the other end of the straight portion has a certain dimension or less. For example, if the other end of the straight portion is separated to such an extent that it is not affected by the heat from the electrode, the coldest portion may be formed on the other end side. Therefore, when the tube inner diameter of the straight portion is 18 mm or less, the distance T needs to be 40 mm or less.

  The communication portion is disposed in a positional relationship satisfying a relationship of 0.5T ≦ H ≦ 4T, where H is a distance from one end of the straight portion to the discharge path center of the communication portion. By arranging the communication portion in such a relationship, a non-discharge space that is sufficiently separated from the discharge path and hardly affected by heat due to discharge is formed, so that the coldest portion is surely formed. become. When the distance H is less than 0.5T, the temperature of the non-discharge space becomes relatively high due to the heat effect of the discharge, and it is difficult to form a desired coldest part. On the other hand, if the distance H exceeds 4T, the non-discharge region on one end side of the linear portion becomes too large, which is not preferable because the fluorescent lamp becomes large.

Incidentally, 0.5 T ≦ H ≦ 4T become fluorescent lamp according to claim 3 which satisfies the relationship, in the lighting of the relationship between the temperature t ₂ of the temperature t ₁ and other end the outer surface of the end outer surface of the straight portions at room temperature atmosphere t _2> it was confirmed that the t _1.

  In the fluorescent lamp of claim 1, amalgam is not essential, but a mercury vapor pressure of 0.1 Pa or less is exhibited at the other end side position of the linear portion where the distance from the electrode is 40 mm or less when the amalgam temperature is 25 ° C. Amalgam may be used. If such an amalgam is used, it is possible to maintain an optimum mercury vapor pressure by the amalgam even when the lamp is lit in a high temperature region, and to prevent the lighting efficiency from being impaired over a wide temperature range. Moreover, if it is the amalgam for fixed quantity sealing (for example, zinc-mercury alloy) which has the characteristic approximate to the vapor pressure characteristic of pure mercury, it can be arrange | positioned in the desired position in a container.

  According to a second aspect of the present invention, there is provided a lighting apparatus comprising: the fluorescent lamp according to the first aspect; an apparatus main body to which the fluorescent lamp is attached; and a fluorescent lamp lighting device housed in the apparatus main body. .

  According to the fluorescent lamp of claim 1, since the coldest part is reliably formed on one end side of the linear part of the translucent discharge vessel that is substantially in the middle of the discharge path, it is lit efficiently in a room temperature atmosphere, Mercury vapor is diffused well throughout the discharge path at the start of lighting, and the rise of the luminous flux can be accelerated.

  According to claim 2, it is possible to provide a luminaire including a fluorescent lamp having the function of claim 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a partially cutaway partially sectional front view showing a compact fluorescent lamp as a first embodiment of a fluorescent lamp of the present invention.

  In the figure, 1 is a translucent discharge vessel, 2 and 2 are a pair of electrodes, 3A and 3B are thin tubes, 4 is a phosphor layer, 5 is a first amalgam, 6 is a second amalgam, 7 is a base, 8 Is a spacer.

  The translucent discharge vessel 1 includes a pair of straight portions 1a, 1a, a communicating portion 1b, and a flare stem 1c made of a soft glass tube having a tube diameter of 17.5 mm, a tube inner diameter of 16.0 mm, and a length of 1100 mm.

  The pair of straight portions 1a, 1a are arranged close to each other in parallel, and one end thereof is hermetically closed. The communication portion 1b is formed by a blow-off method at a position slightly retracted from one end to the other end side of the linear portion 1a and is arranged in an H shape. The communication portion 1b is arranged on one end side of the linear portion 1a of the communication portion 1b. A non-discharge region is formed at the tip, and this is the coldest part. The communication portion 1b is formed so that the distance H from one end of the straight portion 1a to the discharge path center of the communication portion 1b is about 20 mm, and the distance H is about 1.25D.

  The flare stem 1c is sealed at the other end of the pair of straight portions 1a, 1a, and includes a pair of lead wires 1c1 and thin tubes 3A, 3B described later.

  The pair of electrodes 2 and 2 are connected between the pair of internal lead-in wires 1c1 of the flare stem 1c. Each of the pair of electrodes 2 and 2 is sealed at a position where the distance T from the multiple ends of the linear portion 1a is 30 mm. Therefore, the distance H is formed to have a relationship of about 0.66T.

  The thin tubes 3A and 3B are both formed integrally with the flare stem 1c while communicating with the inside of the translucent discharge vessel 1, and the tip protruding outward is sealed. The narrow tube 3A disposed at one end of the translucent discharge vessel 1 further includes a neck portion 3A1 in the middle. The narrow tube 3B disposed at the other end of the translucent discharge vessel 1 does not include a neck portion.

  The phosphor layer 4 is made of a phosphor having a three-wavelength emission type, and is formed on the inner surfaces of the pair of linear portions 1 a of the translucent discharge vessel 1.

  The amalgam 5 is composed of bismuth (Bi) -indium (In) -mercury (Hg) having a mercury vapor pressure of 0.03 Pa when the amalgam temperature is 25 ° C., and the distance from the electrode 2 is It is enclosed in the thin tube 3A so as to be 30 mm.

  The base 7 is attached to the translucent discharge vessel 1 so as to hold both ends of the translucent discharge vessel 1. In addition, 7a is a cap pin.

  The spacer 8 is inserted between the pair of linear portions 1a and 1a of the translucent discharge vessel 1 to prevent the linear portion 1a from being damaged by vibration or impact.

  FIG. 2 is a graph showing the mercury vapor pressure characteristics with respect to the temperature of the fluorescent lamp of the present embodiment. In this graph, the solid line A indicates the mercury vapor pressure of this embodiment, the dotted line B indicates pure mercury, and the dotted line C indicates the mercury vapor pressure of amalgam. The horizontal axis indicates the coldest part temperature in the case of the pure mercury of the dotted line B, and the amalgam temperature in the case of the amalgam of the dotted line C. Moreover, the mercury vapor pressure of this embodiment of the solid line A indicates the coldest part temperature when the ambient temperature is low (about 25 ° C.) or less, and indicates the amalgam temperature when the ambient temperature is high (about 50 ° C.) or more. ing. Point D indicates the mercury vapor pressures of dotted line B and dotted line C when the ambient temperature is 25 ° C. and point E indicates the dotted line B and dotted line C when the ambient temperature is 50 ° C., respectively.

  As can be seen from the graph of FIG. 2, when the ambient temperature is 25 ° C., the amalgam temperature is higher than the coldest part temperature by heating from the electrode, and the mercury vapor pressure in the coldest part is lower than that of the amalgam. In the fluorescent lamp, the mercury vapor pressure is controlled by the coldest part.

On the other hand, when the ambient temperature is 50 ° C., the coldest part temperature and the amalgam temperature both rise, but the mercury vapor pressure of the amalgam becomes lower, so the mercury vapor pressure is controlled by the amalgam in the fluorescent lamp.

  As described above, the mercury vapor pressure characteristics of the fluorescent lamp of the present embodiment show that the mercury vapor pressure at the coldest part is when the ambient temperature is low (about 25 ° C.), and the mercury vapor pressure is high when the ambient temperature is high (about 50 ° C.). It shows mercury vapor pressure characteristics by amalgam. Therefore, it can be seen that even if the ambient temperature changes in the range from low temperature to high temperature, it does not deviate significantly from the optimum mercury vapor pressure (0.8 Pa), and it is lit without greatly impairing the luminous efficiency. Note that the solid line A indicating the mercury vapor pressure characteristics of the fluorescent lamp of the present embodiment shows the mercury in both the coldest part and the amalgam when changing from the point D (ambient temperature 25 ° C.) to the point E (ambient temperature 50 ° C.). Although the vapor pressure characteristic is in an equilibrium state, the mercury vapor pressure in this equilibrium state does not greatly deviate from the optimum mercury vapor pressure (0.8 Pa).

  Further, in order to investigate the stability of the luminous flux of the fluorescent lamp of the present embodiment, the comparative example fluorescent lamp of the present embodiment has the same configuration except that the distance H is 12 mm and the distance T is 40 mm (H = 0.3T). This prototype was manufactured, and a comparative experiment was performed in which the ambient temperature was set to 5 ° C. and 25 ° C. with 100 fluorescent lamps of the present embodiment.

In this comparative experiment, there was not much difference between the two at an ambient temperature of 25 ° C. However, when the lamp was turned on at a low temperature of 5 ° C., one of the 100 fluorescent lamps of the comparative example had a luminous flux of mercury vapor. It became a so-called dark spot where the luminous flux decreased as the pressure decreased. With respect to the fluorescent lamp of the comparative example that became the dark spot, when the temperature t _{1 at} one end outer surface of the linear portion and the temperature t _{2 at the} multi-end outer surface were measured, both t ₁ and t ₂ were about 45 ° C. It was confirmed that the cold part was not formed stably. On the other hand, when t ₁ and t ₂ in a state where the fluorescent lamp of the present embodiment is lit at a low temperature of 5 ° C. are measured, t ₁ is 45 ° C. and t ₂ is 55 ° C. The difference was as large as 10 ° C., and it was confirmed that the coldest part was formed on one end side of the linear part.

  The fluorescent lamp of the present embodiment is formed so that the distance H is approximately 0.66T, and satisfies the relationship of 0.5T ≦ H ≦ 4T, and therefore is a straight line that is substantially in the middle of the discharge path. Since the coldest part is reliably formed on one end side of the part 1a, the light is efficiently lit in a room temperature atmosphere, and mercury vapor is well diffused throughout the discharge path at the start of lighting, and the rise of the luminous flux is fast.

  FIG. 3 is a partially cut-away partial cross-sectional front view showing a compact fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention. In the figure, the same parts as those in FIG.

  The translucent discharge vessel 1 of the present embodiment is formed at the corner of the communication portion 1b so that the communication portion 1b is molded and has a U-shape, and the maximum diameter portion L is 1.4D. Is done. The coldest part is formed at the corner of this communication part, and acts in the same manner as in the first embodiment.

FIG. 4 is a partially cutaway partial cross-sectional front view showing a compact fluorescent lamp as a third embodiment of the fluorescent lamp of the present invention. In the figure, the same parts as those in FIG.

  In the translucent discharge vessel 1 of the present embodiment, the communication portion 1b is formed into a semicircular shape by bending, and the top of the communication portion 1b is formed so that the maximum diameter portion L inside becomes 1.1D. . The coldest part is formed in the vicinity of the top of the communication part, and operates in the same manner as in the first embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway partially sectional front view showing a compact fluorescent lamp as a first embodiment of a fluorescent lamp of the present invention. The graph which shows the mercury vapor pressure characteristic with respect to the temperature of the fluorescent lamp of 1st Embodiment. The partially cutaway partial cross-sectional front view showing a compact fluorescent lamp as a second embodiment of the fluorescent lamp of the present invention. The partially cutaway partial cross-sectional front view showing a compact fluorescent lamp as a third embodiment of the fluorescent lamp of the present invention. The graph which shows the relationship between ambient temperature and the luminous efficiency of a fluorescent lamp.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Translucent discharge vessel, 1a ... Linear part, 1b ... Communication part, 2 ... Electrode, 4 ... Phosphor layer, 5 ... Amalgam.

Claims (2)

At least a pair of straight portions that are close to each other with a length of 1000 mm or more, a communication portion that communicates the pair of straight portions at one end side thereof, and a distance from the other end that is the other end side of the pair of straight portions. Is provided with a pair of electrodes sealed at a position where T becomes T, and when the communication portion is H, the distance from one end of the linear portion to the discharge path center of the communication portion,
0.5T ≦ H ≦ 4T
A translucent discharge vessel arranged in a relationship;
A phosphor layer formed on the inner surface side of the translucent discharge vessel;
A noble gas enclosed in a translucent discharge vessel;
A fluorescent lamp characterized by comprising: A fluorescent lamp according to claim 1;
An instrument body to which the fluorescent lamp is mounted;
A fluorescent lamp lighting device housed in the instrument body;
The lighting fixture characterized by comprising.

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