JP2004303661A - Fluorescent lamp, ballast-free fluorescent lamp, and illumination equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp, a ballast-free fluorescent lamp, and an illumination equipment in which strength of a narrow tube where amalgam is encapsulated is maintained and amalgam is easily sealed as for the ballast-free fluorescent lamp of which a bulb diameter is made smaller. <P>SOLUTION: These have a cylindrical cylinder part having a smaller external diameter than an internal diameter of a bulb even if a light-emitting tube is made to have a smaller diameter accompanying down-sizing of the fluorescent lamp, the light-emitting tube can be sealed airtightly by means of a sealing member having a conical part formed at one end of the cylindrical part, an enough diameter of the cylindrical part to encapsulate the amalgam is surely secured, and encapsulation of the amalgam becomes easier. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluorescent lamp, a bulb-shaped fluorescent lamp, and a lighting fixture.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a bulb-type fluorescent lamp has been known which includes a cover having a base attachable to a general lighting bulb socket, accommodates a lighting circuit inside the cover, and accommodates the globe by bending an arc tube or the like. ing.
[0003]
In recent years, fluorescent lamps, which are arc tubes, have been reduced in size and increased in efficiency due to the use of electronic circuits in lighting circuits, processing techniques, and improvements in materials, and the like. 2. Description of the Related Art A bulb-type fluorescent lamp having a characteristic of life is known (for example, see Patent Document 1).
[0004]
Since the conventional bulb-type fluorescent lamp has a small tube diameter and a high output, it is lit with a high tube wall load, so that the ambient temperature is high even during normal lighting. The mercury vapor pressure in the arc tube increases with the ambient temperature, and the arc tube filled with pure mercury cannot be operated at an optimal vapor pressure in a high-temperature atmosphere. Therefore, it is possible to light the lamp efficiently by enclosing the amalgam in the arc tube and reducing the vapor pressure.
[0005]
[Patent Document 1]
JP 2000-21351 A
[Problems to be solved by the invention]
However, the compact fluorescent lamp as disclosed in Patent Literature 1 has been reduced in size to a size that approximates the outer dimensions of a 60 W incandescent lamp, but further miniaturization is desired. However, as the size of the arc tube is restricted due to further miniaturization, the discharge path length of the arc tube cannot be sufficiently secured with the diameter of the conventional U-shaped bent bulb, and a desired light output is obtained. There is a problem that cannot be obtained. In addition, due to the dimensional restriction of the arc tube, the diameter of the thin tube containing amalgam is further reduced, and it is becoming difficult to enclose the amalgam in the thin tube.
[0007]
The present invention has been made in view of such a point, and in a bulb-type fluorescent lamp having a reduced bulb diameter, while maintaining the strength of a thin tube for enclosing amalgam, a fluorescent lamp and a light bulb capable of easily enclosing amalgam. It is an object of the present invention to provide a shaped fluorescent lamp and a lighting fixture.
[0008]
[Means for Solving the Problems]
The fluorescent lamp according to claim 1, comprising: an arc tube having a plurality of bent bulbs; a cylindrical cylinder having a diameter smaller than the bulb diameter; A sealing member for sealing a valve end portion in which an electrode is not sealed by the opening of the portion; and amalgam sealed in a cylindrical portion constituting the sealing member. .
[0009]
A fluorescent lamp according to a second aspect of the present invention is characterized in that the cylindrical portion constituting the sealing member of the first aspect has an outer diameter smaller than the inner diameter of the bulb.
[0010]
If the cylindrical portion constituting the sealing member has the same diameter as the valve diameter and a diameter larger than the valve diameter, it is difficult to accommodate the inside of the cover, which is a small and limited space. However, since granular amalgam is sealed in the cylindrical portion, it is necessary to secure an inner diameter capable of sealing amalgam even in a cylindrical portion having a smaller diameter than the valve diameter.
[0011]
The opening of the conical portion that seals the opening of the valve end is formed substantially equal to the valve end. The conical portion can easily seal the valve end by heating and fusing the conical opening and the valve end. Therefore, in other words, when the joining portion of the cylindrical portion and the conical portion constituting the sealing member is continuously melted by heating and melting to form a substantially trumpet shape, the inclined surface of the conical portion is inclined with respect to the central axis of the cylindrical portion. If it is expanded so as to have an inclination close to 90 °, the connection part of the cylindrical part, which is the top part of the conical part, and the opening of the conical part are too close to each other, and are affected by heat at the time of sealing, so that the conical part and the cylindrical part There is a possibility that a crack may occur in the connection part of the part. On the other hand, if the expansion inclination is small with respect to the central axis of the cylindrical portion, the height increases in the height direction of the conical portion until it has an opening substantially equal to the opening at the end of the valve, which is not suitable for downsizing. Therefore, it is desirable that the opening is expanded so as to have an inclination of about 30 ° to 60 ° with respect to the central axis of the cylindrical portion.
[0012]
The method of forming the cylindrical portion and the conical portion forming the sealing member may be either integrally formed by welding each other, or may be formed by pouring molten glass into a trumpet-shaped mold. Is not particularly limited.
[0013]
The arc tube and the sealing member are preferably made of glass such as lead glass, soda glass, borosilicate glass, barium silicate glass, etc. However, other materials such as ceramics may be used as long as they are translucent. In particular, considering the effect on the environment, it is optimal to form with lead-free glass.
[0014]
In order to reduce the size of the fluorescent lamp as a whole and not to decrease the light output, it is important to reduce the diameter of the arc tube and secure the discharge path length. Therefore, it is desirable that the diameter of the bulb constituting the fluorescent lamp is 10 mm or less. Preferably 5 to 9 mm. However, when using a small-diameter bulb having a tube inner diameter of 9 mm or less, it is difficult to dispose the filament electrode in a direction perpendicular to the bulb axis. A small-sized electrode may be used, or the filament electrode may be disposed so as to be parallel to the bulb axis direction.
[0015]
According to the fluorescent lamp according to claim 1 or 2, even if the arc tube is reduced in size with downsizing of the fluorescent lamp, the fluorescent lamp has a cylindrical portion having an outer diameter smaller than the inner diameter of the bulb, and With the sealing member having a conical portion formed at one end of the cylindrical portion, the arc tube can be hermetically sealed, and the diameter of the cylindrical portion for enclosing the amalgam can be reliably ensured. It will be easier. Further, the cylindrical portion constituting the sealing member has a function as a so-called amalgam filling thin tube for filling amalgam and a so-called exhaust pipe for performing exhaust and gas filling in a fluorescent lamp manufacturing process. Therefore, if it has an outer diameter equal to or less than the inner diameter of the valve and has an inner diameter larger than the amalgam granules, it is easy to encapsulate granular amalgam, and it is also possible to efficiently exhaust and enclose gas.
[0016]
A bulb-type fluorescent lamp according to claim 3, wherein the plurality of bent bulbs are connected to each other so that the ends thereof are in the same direction, and an arc tube in which one discharge path is formed; a base on one side and a base on the other side. A cover body to which the arc tube is attached; a plurality of electronic components constituting a lighting circuit for lighting the arc tube; and a circuit board having the electronic components mounted on both sides, and housed in the cover body. And a lighting device.
[0017]
The arc tube has one bent discharge path. For example, even if three bent bulbs are used and three straight portions are arranged on the circumference of the cylinder, four arc tubes are arranged in parallel. U-shaped bent valves having substantially the same diameter may be juxtaposed in a direction perpendicular to the plane formed by these valves, and if there is an end in addition to a pair of valve ends in which electrodes are sealed, light emission is performed. The shape and configuration of the tube are not particularly limited.
[0018]
The lighting device is housed in a cover body, and is preferably an inverter type, but is not limited to this in view of the nature of the present invention. The lighting device is housed directly or indirectly attached to the cover.
[0019]
According to the third aspect of the invention, it is possible to provide a bulb-type fluorescent lamp having the function of the fluorescent lamp according to the first or second aspect.
[0020]
According to a fourth aspect of the invention, there is provided a bulb-type fluorescent lamp, wherein the cylindrical portion as a sealing member of the bulb-type fluorescent lamp according to any one of the first to third aspects is closer to the center of the circuit board than the sealing portion at the bulb end. It is characterized by being bent to the inside of the cover and protruding.
[0021]
The present inventors have studied focusing on reducing the amalgam temperature at the time of stable lighting in order not to lower the luminous flux rising characteristic of a bulb-type fluorescent lamp having a high output and a small tube diameter, that is, a high tube wall load. Advanced. That is, since amalgam is intended to optimally control the mercury vapor pressure in the arc tube during stable lighting, for example, bismuth-indium-based main amalgam has a high temperature of 90 to 130 ° C. Also, it is possible to control the mercury vapor pressure of the arc tube to be about 1 Pa which is the optimum value. However, since such amalgam has a characteristic that the mercury vapor pressure is lower than that of pure mercury, the mercury vapor pressure at the instant of lighting after being turned off in an atmosphere at an ambient temperature of about 25 ° C. is 0.1 Pa The luminous flux is low before and after reaching a high temperature atmosphere by self-heating. Therefore, if the temperature of the amalgam during stable lighting can be lowered, it is not necessary to control the mercury vapor pressure excessively low by the amalgam, and the mercury vapor pressure at the time of lighting can be increased, so that the rise of the luminous flux can be improved. .
[0022]
Therefore, when the temperature of each part of the bulb-type fluorescent lamp lit with the base facing upward was measured, the temperature of the space inside the cover body became lower as the distance from the substrate surface of the lighting device became lower. It could be confirmed. This is because the board of the lighting device has the effect of shielding the radiant heat of the arc tube, the air inside the cover is stagnant, and there is not much convection of the air inside the cover. It is considered that the temperature near the base is relatively low. Here, the main components of the lighting device mean, among transistors, inductors, transformers, film capacitors, and resistors, circuit elements that generate a relatively large amount of heat during the lighting operation and have a relatively large volume. However, circuit elements that generate relatively little heat, such as electrolytic capacitors, are not included.
[0023]
Therefore, an arc tube was prepared by extending the thin tube so that the tip of the thin tube was located on the lighting device side, and the amalgam with a relatively high mercury vapor pressure was placed inside the thin tube so that the amalgam was located closer to the base than the main parts of the lighting device. A prototype of a bulb-type fluorescent lamp sealed in was manufactured and turned on. As a result, light output characteristics were obtained in which the rising of the luminous flux immediately after lighting was good and the luminous flux during stable lighting did not decrease.
[0024]
However, as the distance from the main amalgam to the arc tube increases, the dimension in the height direction increases and the bulb-type fluorescent lamp becomes large, and it takes time for mercury vapor to diffuse from the main amalgam to the arc tube. Therefore, the separation distance of the main amalgam from the substrate surface needs to be 50 mm or less, preferably 40 mm or less.
[0025]
The main amalgam enclosed in the thin tube has a characteristic that the mercury vapor pressure immediately after lighting is close to pure mercury and the mercury vapor pressure during stable lighting can be controlled to an appropriate value. For example, when the temperature of the amalgam is 25 ° C, it is 0.1 to 0.24 Pa, preferably 0.15 to 0.24 Pa, and when the temperature of the amalgam is 50 to 60 ° C, it is 1.0 to 2.0 Pa. Are preferred. In addition, when enclosing the amalgam, it is preferable to arrange the auxiliary amalgam in the arc tube in order to compensate for the diffusion of mercury vapor immediately after lighting.However, this auxiliary amalgam is not indispensable. As long as the arc tube is configured under the condition where diffusion occurs, only the amalgam may be enclosed.
[0026]
The arc tube held by the cover body has one bent discharge path. For example, when three bent bulbs are used, and three linear parts are arranged on the circumference of three circles, Since the straight portion is arranged along the circumference in a substantially equilateral triangular prism shape surrounded by the valve when viewed from the bent portion side, the thin tube protruding from the valve end portion is located on the base side from the circumferential direction of the circuit board. It will protrude. The inner space of the cover for accommodating the thin tube protruding from the circumferential direction of the circuit board toward the base, since the cover body has a substantially conical rotating body shape, the height dimension of the center of the circle of the circuit board, that is, the vicinity of the base The distance becomes maximum, and the dimension in the height direction becomes smaller as it goes in the circumferential direction of the circuit board. Therefore, in order to separate the thin tube protruding from the bulb end from the arc tube serving as a heat source and extend it to the vicinity of the base in the space inside the cover, the thin tube protruding from the circumferential direction of the circuit board should not contact the inner wall of the cover. In addition, it is necessary to bend toward the center of the circle.
[0027]
If the smoothing electrolytic capacitor of the lighting device is arranged so as to protrude more toward the base than the main components of the lighting device, the lighting device is configured such that the amalgam enclosed in the thin tube is smaller than the electronic components excluding the smoothing electrolytic capacitor. It is housed in the cover body in a positional relationship such that it is located on the base side.
[0028]
Further, when the substrate of the lighting device is arranged so as to shield the radiant heat of the arc tube, the lighting device is such that the amalgam enclosed in the thin tube is 5 to 50 mm from the substrate surface, preferably 10 to 50 mm, Optimally, they are accommodated in the cover in a positional relationship such that they are separated by 15 to 40 mm.
[0029]
As described above, in order to enclose amalgam having a relatively high mercury vapor pressure, it is necessary to bend the cylindrical portion and extend it to the inner space of the cover. However, in the case of a thin tube having an inner diameter approximately the same as the amalgam diameter, when the glass tube is bent after being heated, glass is accumulated inside the bent portion and the inner diameter of the glass tube is further reduced. There is a risk that they will coalesce. Further, although the strength of the thin tube can be ensured by increasing the thickness of the thin tube extending to the space inside the cover, it takes time for heating when bending, and it is difficult to bend easily. Therefore, it is preferable that the inner diameter of the thin tube is 2 to 8 mm and the thickness is about 0.3 to 1.0 mm.
[0030]
The cylindrical portion may be used not only for enclosing the main amalgam but also as an exhaust pipe. The cylindrical portion used for enclosing the main amalgam is sealed so that the main amalgam is located on the base side in the accommodation space of the lighting device, and thus the distal end portion is extended so as to extend toward the base side.
[0031]
Further, since the thickness of the cylinder is formed to be about 0.3 to 1.0 mm, the occurrence of cracks and the like can be suppressed even if an external impact or the like is received.
[0032]
According to the fourth aspect of the invention, in addition to the function of any one of the first to third aspects, the base side space in the cover body having a relatively low temperature in the cover body having a rotary body shape having a substantially conical cylindrical portion. In order to arrange the amalgam, the cylindrical portion protruding from the circumferential direction of the circuit board is bent toward the center of the circle of the circuit board, so that the amalgam can be arranged in the space on the base side in the cover body having a relatively low temperature. The use of amalgam having a high mercury vapor pressure makes it possible to improve the luminous flux rising characteristics.
[0033]
According to a fifth aspect of the present invention, there is provided a lighting apparatus comprising: the bulb-type fluorescent lamp according to any one of the first to fourth aspects; and a fixture body to which the bulb-type fluorescent lamp is mounted. is there.
[0034]
According to the fifth aspect of the present invention, it is possible to provide a lighting fixture having the function of any one of the first to fourth aspects.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a fluorescent lamp according to an embodiment of the present invention will be described with reference to the drawings.
[0035]
FIG. 1 is a front view showing a bulb-type fluorescent lamp according to the first embodiment, FIG. 2 is a development view of an arc tube of the bulb-type fluorescent lamp of FIG. 1, and FIG. 3 is an enlarged schematic view of a sealing member.
[0036]
The fluorescent lamp 10 shown in FIG. 2 has bent bulbs 11a, 11b, and 11c made of glass, and a phosphor layer of, for example, a three-wavelength emission type is formed on the inner surface of each of the bulbs 11a, 11b, and 11c. Noble gas is sealed.
[0037]
The fluorescent lamp 10 is configured by connecting these three bent bulbs 11a, 11b, 11c in a state where they are juxtaposed such that their U-shaped surfaces face each other in parallel. Each bent valve 11a, 11b, 11c is, for example, a glass tube having a tube outer diameter of 5 to 10 mm, and in this embodiment, a glass tube having a substantially cylindrical cross section having a tube diameter of about 6.5 mm and a tube inner diameter of about 5 mm, is curved at an intermediate portion. It has a bent portion and is formed in a substantially U-shape. That is, the bending valves 11a, 11b, and 11c include a bending portion that bends and a pair of parallel connection tubes 12a and 12b that are continuous with the bending portion. A pair of electrodes are mounted at one end of the bent bulbs 11a and 11c at both ends located on a diagonal line of the fluorescent lamp 10. The end of the central bent valve 11 b is sealed by a sealing member 13. The sealing member 13 has a tube diameter of 3.5 mm, a wall thickness of about 0.5 m, a thin tube 13 a as a cylindrical portion having a length of 15 to 40 mm, and one end of the thin tube 13 a with respect to the central axis of the thin tube 13 a. A conical portion 13b having a conical shape with a 45 ° inclined surface is formed, and a valve end is sealed by an opening edge of the conical portion 13b. A substantially middle portion of the thin tube 13a has a bent portion 13c which bends in a direction approaching the center of the circuit board 71 and which is bent again at two places so as to be parallel to the valve axis direction in which the thin tube 13a is sealed. I have. In other words, the bent portion 13c is for extending the distal end portion toward the base 40 while moving the distal end portion toward the center of the circuit board 71 so that the thin tube 13a does not contact the inner wall surface of the cover body 60. It is. The length from the end of the valve 11b to the tip of the thin tube 13a is about 40 mm. In addition, it protrudes about 45 mm in a linear length. The amalgam 30 formed of a metal alloy with mercury (Hg), bismuth (Bi), indium (In), tin (Sn), or the like is accommodated in the thin tube 13a. The composition of the amalgam 30 of the present embodiment is Bi-In-Hg.
[0038]
The fluorescent lamp 10 is configured such that the height H1 of the central bent bulb 11b is 35 to 40 mm, the height H2 of the bent bulbs 11a and 11c at both ends is 35 to 40 mm, and has a relationship of approximately H1> H2. . The height H1 of the central bent valve 11c and the height H2 of the bent valves 11a and 11c at both ends mean the length from the valve end to the top of the bent portion.
[0039]
The three bent valves 11a, 11b, and 11c are sequentially connected by connecting pipes 12a and 12b, and one continuous discharge path having a discharge path length of 120 to 200 mm is formed.
[0040]
Next, a bulb-type fluorescent lamp according to the present embodiment will be described with reference to FIG.
[0041]
The bulb-type fluorescent lamp L has an outer shape similar to the standard size of a small incandescent lamp such as mini krypton, and a dimension in a height direction from the base 40 to the globe 50 is 75 to 105 mm. It is formed to the extent. The cover body 60 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT) or the like, and is formed in a substantially conical shape expanding toward the fluorescent lamp 10.
[0042]
The holder 61 is attached to the opening at the lower end of the cover body 60, and is formed in a disk shape from a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT). A plurality of mounting holes (not shown) through which the fluorescent lamp 10 is inserted are formed in the holder 61, and the holder 61 is fixed with an adhesive such as a silicone resin (not shown) while the ends of the fluorescent lamp 10 are inserted through these mounting holes. At the same time, a lighting device 70 is disposed on the side of the holder 61 on which the fluorescent lamp 10 is not mounted.
[0043]
The lighting device 70 includes a substantially disk-shaped circuit board 71 disposed on a parallel surface perpendicular to the longitudinal direction of the fluorescent lamp 10, and one surface of the circuit board 71 on the base 40 side and both surfaces on the fluorescent lamp 10 side. A high-frequency lighting device 70, which is an inverter circuit on which a plurality of electric components 72 are mounted and which turns on the fluorescent lamp 10 at high frequency, is configured.
[0044]
The circuit board 71 has an opening 71a for inserting the thin tube 13a in which the amalgam 30 is sealed.
[0045]
The globe 50 is made of a transparent or light-diffusing milky white or the like, and has a maximum diameter of 35 to 45 mm and is formed in a substantially spherical shape similar to the shape of a glass bulb of a mini krypton type bulb by glass or synthetic resin. An opening is formed on one side.
[0046]
Finally, the base 40 and the globe 50 are attached to complete the bulb-type fluorescent lamp L.
[0047]
The bulb-shaped fluorescent lamp L thus configured can obtain a total light flux of 480 lm by using a three-wavelength light-emitting phosphor at an input power rating of 10 W.
[0048]
According to the light bulb shaped fluorescent lamp L as described above, it has an outer diameter smaller than the inner diameter of the bulb, can easily enclose amalgam, can reliably secure a certain inner diameter, and is formed at one end of the cylindrical portion. The conical portion allows the valve end to be easily sealed. Further, in order to improve the luminous flux rising characteristics, sufficient strength can be maintained even when the tube cover is extended and bent to the internal space of the thin tube cover.
[0049]
Although the globe 50 is provided in the present embodiment, a similar effect can be obtained even if the globe 50 is omitted.
[0050]
The amalgam 30 is not limited to the one for controlling the mercury vapor pressure as in the present embodiment, but can also be used for a fixed amount of amalgam such as zinc (Zn) amalgam. It may be used when the medium is sealed in the thin tube 13a.
[0051]
Further, the number of bending bulbs 11a, 11b, 11c of the fluorescent lamp 10 is not limited to three, but the same effect can be obtained with three or less or four or more. Further, the present invention is not limited to the compact fluorescent lamp L, but may be a compact fluorescent lamp.
[0052]
FIG. 4 is a partially cutaway sectional view showing one embodiment of the lighting fixture of the present invention.
[0053]
In the figure, reference numeral 41 denotes a bulb-type fluorescent lamp. Reference numeral 40 denotes an embedded lighting fixture main body. The fixture main body 40 includes a base 42, a socket 43, and a reflection plate 54.
[0054]
【The invention's effect】
According to the fluorescent lamp of the first or second aspect, even when the arc tube is reduced in size with the downsizing of the fluorescent lamp, the fluorescent lamp has a cylindrical portion having an outer diameter smaller than the inner diameter of the bulb, With the sealing member having a conical portion formed at one end of the cylindrical portion, the arc tube can be hermetically sealed, and the diameter of the cylindrical portion for enclosing the amalgam can be reliably ensured. It will be easier. Further, the cylindrical portion constituting the sealing member has a function as a so-called amalgam filling thin tube for filling amalgam and a so-called exhaust pipe for performing exhaust and gas filling in a fluorescent lamp manufacturing process. Therefore, if it has an outer diameter equal to or less than the inner diameter of the valve and has an inner diameter larger than the amalgam granules, it is easy to encapsulate granular amalgam, and it is also possible to efficiently exhaust and gas.
[0055]
According to the third aspect of the invention, it is possible to provide a bulb-type fluorescent lamp having the function of the fluorescent lamp according to the first or second aspect.
[0056]
According to the fourth aspect of the invention, in addition to the function of any one of the first to third aspects, the base side space in the cover body having a relatively low temperature in the cover body having a rotary body shape having a substantially conical cylindrical portion. In order to arrange the amalgam, the cylindrical portion protruding from the circumferential direction of the circuit board is bent toward the center of the circle of the circuit board, so that the amalgam can be arranged in the space on the base side in the cover body having a relatively low temperature. The use of amalgam having a high mercury vapor pressure makes it possible to improve the luminous flux rising characteristics.
According to the fifth aspect of the present invention, it is possible to provide a lighting fixture having the function of any one of the first to fourth aspects. According to the fifth aspect of the present invention, it is possible to provide a lighting fixture having the function of any one of the first to fourth aspects.
[Brief description of the drawings]
FIG. 1 is a front view showing a compact fluorescent lamp according to a first embodiment.
FIG. 2 is an exploded view of an arc tube of the compact fluorescent lamp of FIG.
FIG. 3 is an enlarged schematic view of a sealing member of the compact fluorescent lamp of FIG. 1;
FIG. 4 is a partial side sectional view showing an embodiment of the lighting fixture of the present invention.
[Explanation of symbols]
10: fluorescent lamp, 13: sealing member, 13a: thin tube, 13b: conical part,
13c: bent part, 30: amalgam

Claims (5)

An arc tube having a plurality of bent bulbs;
A sealing member for sealing a valve end that has a cylindrical portion having a diameter smaller than the valve diameter and a conical portion that expands substantially conically from the cylindrical portion and that is not sealed with an electrode by an opening of the conical portion. When;
Amalgam enclosed in a cylindrical part constituting a sealing member;
A fluorescent lamp comprising: 2. The fluorescent lamp according to claim 1, wherein the cylindrical portion forming the sealing member has an outer diameter equal to or larger than the inner diameter of the bulb. An arc tube in which the ends of the plurality of bent bulbs are connected to each other so as to be in the same direction and one discharge path is formed;
A cover body having a base on one side and an arc tube mounted on the other side;
A plurality of electronic components constituting a lighting circuit for lighting the arc tube, and a lighting device having a circuit board on which both sides of the electronic components are mounted and housed in the cover;
The bulb-type fluorescent lamp according to claim 1 or 2, further comprising: The light bulb according to any one of claims 1 to 3, wherein the cylindrical portion of the sealing member is bent and protrudes from the sealing portion at the bulb end to the space inside the cover in the center direction of the circuit board. Shaped fluorescent lamp. A bulb-shaped fluorescent lamp according to any one of claims 1 to 4, and
An instrument body equipped with the bulb-shaped fluorescent lamp;
A lighting fixture comprising:

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