JP2008004398A - Light bulb-type fluorescent lamp and lighting fixture - Google Patents

Abstract

【Task】
Provided is a bulb-type fluorescent lamp that suppresses the temperature rise of the arc tube and the holder and suppresses the discoloration of the holder and the cloudiness of the globe without impairing the lamp characteristics even when the reflective globe is provided.
[Solution]
The bulb-type fluorescent lamp 10 is disposed so that the tube axes of the pair of end portions 11b and 11c of the arc tube 11 are parallel to the spiral central axis of the intermediate portion, and thus is emitted from the electrode portions 11d and 11d. The reflected heat is reflected by the direct reflection film 16a of the globe 16 and is easily emitted outward from the light transmitting portion 16b, and the temperature rise inside the globe 16 can be suppressed. Further, since the holder 12 is made of metal, a substance that causes discoloration and white turbidity is not deposited. For this reason, even if the holder 12 is visually observed from the translucent part 16b, it is hardly felt that the holder 12 has deteriorated, and the translucent part 16b of the globe 16 does not become cloudy, thereby improving the merchantability. .
[Selection] Figure 1

Description

  The present invention relates to a light bulb shaped fluorescent lamp having a globe provided with a reflective film and a lighting fixture.

  The bulb-type fluorescent lamp is widely used as an alternative light source for an incandescent bulb because it has advantages such as high efficiency, power saving, and long life. As a light-emitting tube of a bulb-type fluorescent lamp, a light-emitting tube formed by connecting glass bulbs bent in a U-shape is generally used, but a single bulb including a pair of ends is double-spiraled. An arc tube configured to be bent into a shape is also used (see, for example, Patent Document 1).

By the way, for the purpose of increasing the illuminance of the bulb-type fluorescent lamp, a bulb-type fluorescent lamp having a reflective globe has been commercialized (for example, see Patent Document 2). The reflective globe is formed by forming a light transmitting portion on the top of the globe by depositing a metal such as aluminum on the inner surface on the opening side of the globe to form a reflective layer. When the arc tube in the reflective globe is turned on to emit light, the light reflected by the reflective film is transmitted from the translucent part, and the illuminance directly below the bulb-type fluorescent lamp is improved. Thus, the bulb-type fluorescent lamp with a reflective globe can be used mainly as a light source for spot illumination.
JP 2004-265736 A JP 2003-281901 A

  Since light such as infrared rays is emitted from the arc tube of the bulb-type fluorescent lamp as well as light, when a reflective film is formed around the arc tube like a reflective globe, it is emitted from the arc tube. Heat is blocked by the reflective film, and much radiant heat is trapped in the globe. In particular, since the electrodes at the time of lighting become high temperature, the amount of heat radiated from the end portion of the arc tube in which the electrode is sealed is larger than other portions, so the holder supporting the end portion of the arc tube has a high temperature. Become. On the other hand, the heat radiated from the arc tube is reflected by the reflective film of the reflective globe, and a certain amount of heat is radiated from the translucent part.

  However, in the conventional bulb-type fluorescent lamp with a reflective globe, the effect of reflecting the radiant heat by the reflective film and radiating outward through the translucent part is low, and the temperature of the arc tube rises excessively. The effect on the lamp characteristics, such as a decrease in luminous flux, was significant.

  In addition, since the temperature of the holder significantly increases due to the temperature rise of the arc tube, there is a problem that the resin holder deteriorates and turns brown. The discoloration of the holder is not noticeable when the arc tube is covered with a light diffusing glove, so it does not greatly affect the product quality, but in the case of a reflective glove, the holder can be seen through the translucent part. It is necessary to suppress discoloration of the holder.

  Furthermore, when the resin component in the globe deteriorates, a low-molecular oligomer component may be deposited from the surface of the resin component, float in the globe, adhere to the inner surface of the globe, and the globe may become cloudy. Since the white turbidity is particularly noticeable in the translucent part of the reflective globe, it is necessary to minimize the white turbidity of the globe.

  The present invention has been made in view of the above problems, and even when a reflective glove is provided, the temperature rise of the arc tube and the holder is suppressed, and the discoloration of the holder and the glove can be reduced without impairing the lamp characteristics. An object of the present invention is to provide a bulb-type fluorescent lamp in which white turbidity is suppressed.

  The bulb-type fluorescent lamp of the present invention has a pair of end portions on one side and an intermediate portion formed in a spiral shape and extends to the other end side, and the tube axis of the pair of end portions is a spiral center of the intermediate portion. An arc tube formed so as to be parallel to each axis and having an electrode sealed at each of a pair of ends; a metal substrate portion; and an end portion of the arc tube in an insertion hole formed in the substrate portion A holder for supporting the arc tube by fixing the end of the arc tube with the electrode positioned on the other side of the metal substrate portion; a lighting device for lighting the arc tube; a base on one side A cover body provided with a lighting device installed therein and a holder attached so that the arc tube is disposed on the other side; a reflective film is formed on the base end side so that the top side is a translucent part A glove having an opening attached to the holder so as to cover the arc tube; And wherein the door.

  The arc tube is formed by bending a middle portion excluding a pair of end portions of one straight tube bulb in a spiral shape. The valve central axis at the end is formed to be parallel to the helical axis when the intermediate part is bent in a spiral. Thereby, a pair of edge part is provided like a pair of leg part upright with respect to the board | substrate part plane of the holder. The arc tube is supported by the holder. At this time, the electrode sealed at the end is positioned on the other end side of the holder.

  In the conventional arc tube, since other arc tubes and holder members are adjacent to each other around the pair of ends of the arc tube, the proportion of heat radiated from the electrode portion is directly radiated to the reflective film of the globe is small. It was. In the case of an arc tube in which U-shaped bent bulbs are connected, the electrode portion is adjacent to the end portion of another bent bulb, and the entire arc tube including the end portion is bent in a double spiral shape. In this case, since the substrate portion of the holder is adjacent, radiant heat is shielded and absorbed by this adjacent portion. From this, it is considered that the temperature inside the globe was likely to rise in the conventional bulb-type fluorescent lamp with a reflective globe.

  On the other hand, if the tube axes of the pair of end portions of the arc tube are arranged so as to be parallel to the spiral central axis of the intermediate portion as in the present invention, the temperature rise inside the globe can be suppressed. This is because only the other end is disposed in the direction perpendicular to the tube axis of the pair of ends of the arc tube, so that the heat directly radiated from the electrode portion to the reflective film increases. That is, since the heat directly radiated to the reflective film of the globe is reflected by the reflective film and most of it is radiated to the outside through the translucent part, the more heat directly radiated to the reflective film, It becomes possible to suppress the temperature rise.

  The metal holder is preferably a metal having high thermal conductivity, low cost, and light weight such as aluminum or an alloy of aluminum and zinc or an alloy containing aluminum, but includes copper and an alloy containing copper, iron and iron. An alloy or the like may be used. In short, all metals having good thermal conductivity are allowed as compared with the synthetic resin constituting the conventional holder.

  Further, the metal of the holder is preferably white or glossy, and a material exhibiting a surface having a high light reflectance, but is not particularly limited to having these elements.

  The shape of the substrate portion of the holder need not be a geometrically strict circle, but may be a polygonal shape such as an octagon or a hexagon. The insertion hole formed in the substrate portion has a shape into which the end of the arc tube can be inserted.

  According to the present invention, since the tube axes of the pair of end portions of the arc tube are arranged so as to be parallel to the spiral central axis of the intermediate portion, the heat radiated from the electrode portion is directly reflected by the reflective film. It becomes easy to be radiated | emitted outward from a translucent part, and the temperature rise inside a glove can be suppressed. Further, since the holder is made of metal, a substance that causes discoloration and white turbidity does not deposit. For this reason, even if the holder is visually observed from the translucent part, it is hardly felt that the holder has deteriorated, and the translucent part of the glove is not clouded.

Another aspect of the present invention is characterized in that the peripheral side surface of the holder is exposed to the outside, and an opening of a glove is attached to the inside of the peripheral side surface.
The peripheral side surface of the holder is provided so as to be exposed to the outside of the bulb-type fluorescent lamp. The larger the area exposed to the outside, the better the heat dissipation effect, but it is difficult to make it too large due to problems with the appearance of the product, the exposed area is designed from the viewpoint of heat dissipation effect, appearance, design etc. What is necessary is just to select suitably as a problem.
The peripheral side surface is preferably provided so as to form a continuous ring shape over the entire outer periphery of the holder, but it is not a condition that the ring shape is continuous over the entire periphery. The shape of the peripheral side surface may be appropriately selected as a design problem from the viewpoint of heat dissipation performance, appearance, and design, as with the area exposed to the outside.
The peripheral side surface is preferably formed integrally with the substrate portion that supports the arc tube. For example, die casting such as aluminum or press-working of an aluminum plate may be used, but both can be thermally connected. If there is, it may be formed separately.

  The structure in which the holder supports the arc tube is effective when the thermal connection is performed with an adhesive having good thermal conductivity such as a silicone adhesive so that the heat of the arc tube can be easily conducted to the holder. The effect is improved.

A glove opening is attached to the inside of the peripheral side of the holder. For example, a concave part made of a ring-shaped groove is formed inside the peripheral side of the holder, and the glove opening is inserted into the groove of the concave for support. You may make it do.
According to the present invention, since the heat of the arc tube is effectively radiated to the outside through the peripheral side surface of the metal holder, the temperature rise of the arc tube and the holder is effectively suppressed.

  The lighting fixture of the present invention includes the above-described light bulb-type fluorescent lamp and a fixture main body on which the fluorescent lamp is mounted.

  According to such a structure, the lighting fixture provided with the lightbulb-type fluorescent lamp which has an effect | action of this invention can be provided.

  According to the bulb-type fluorescent lamp of the present invention, since the tube axes of the pair of end portions of the arc tube are arranged so as to be parallel to the spiral central axis of the intermediate portion, the heat radiated from the electrode portion is It becomes easy to be reflected by the direct reflection film and radiated outward from the translucent part, and the temperature rise inside the globe can be suppressed. Further, since the holder is made of metal, a substance that causes discoloration and white turbidity does not deposit. For this reason, even if the holder is visually observed from the translucent part, it is hardly felt that the holder has deteriorated, and the translucent part of the glove is not clouded, thereby improving the merchantability.

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

  1 and 2 show a bulb-type fluorescent lamp according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view in front view showing a part cut away, and FIG. 2 is a partial longitudinal sectional view in side view. is there.

  FIG. 3 is a cross-sectional view schematically showing a lighting fixture installed on a ceiling surface, showing a lighting fixture according to an embodiment of the present invention.

  Reference numeral 10 denotes a bulb-type fluorescent lamp, a light emitting tube 11, a holder 12 that supports the light emitting tube 11, a circuit board 13 that constitutes a lighting circuit of the light emitting tube 11 and is supported by the holder 12, and a cover that is supported by the holder 12. It comprises a body 14, a base 15 attached to one side of the cover body 14, and a reflective glove 16 that is supported by the holder 12 and covers the arc tube 11. Hereinafter, the arc tube 11 will be described as the upper side and the base 15 as the lower side.

  The arc tube 11 has a central region of one straight tubular glass tube as a top portion 11a, a pair of end portions 11b and 11c are located on one side, an intermediate portion is formed in a spiral shape, and extends to the other end side. Thus, the entire structure excluding the pair of end portions 11b and 11c is formed in a spiral shape.

  The arc tube 11 having a spiral shape is formed by heating and melting one straight tubular glass tube, bending it so as to be approximately bisected in a soft state, and further dividing the central region of the bisected glass tube at the top. 11a is formed by winding the intermediate portion along a mold having a spirally formed groove. The pair of end portions 11b and 11c are formed so that their tube axes are parallel to the spiral central axis of the intermediate portion.

  The arc tube 11 is made of transparent lead-free glass and has an outer diameter of about 9.4 mm and an inner diameter of about 8.0 mm. On the inner surface of the glass tube, for example, a three-wavelength emission type rare earth oxide fluorescent light is used. A phosphor layer made of a body is formed. The arc tube 11 has a height h1 of about 73 mm and a maximum width d1 of about 43 mm.

  The pair of end portions 11b and 11c of the arc tube 11 are formed so that the respective end portions face each other in a straight line and are extended in the vertical direction.

  Further, each end 11b, 11c of the arc tube constitutes an electrode sealing end, and the filament electrodes 11d, 11d are sealed by a stem seal.

  A pair of outer wires are led out from the end portions 11b and 11c, and are connected to output terminals of a lighting circuit to be described later.

  Further, the arc tube 11 is sealed at one end 11c so that the narrow tube 11e communicates with the inside of the tube. The thin tube 11e is made of a transparent lead-free glass similar to the glass constituting the arc tube 11, and encloses a main amalgam or the like inside, and is bent into a shape along the inner surface shape of the cover member 14 to be described later. To form. For example, the amalgam 10 having a mercury ratio of 15% or more is accommodated at the tip of the thin tube 11e.

  The arc tube 11 is filled with a rare gas which is a discharge medium made of argon (Ar) alone or a mixed gas of argon (Ar) and neon (Ne). Other rare gases such as krypton (Kr) may be sealed as required.

  The holder 12 is formed in the shape of a substantially disk-shaped shallow vessel, is constituted by aluminum die-casting, and a pair of supports that serve as support portions for the arc tube 11 on the upper surface that forms the disk-shaped surface of the disk-shaped substrate portion. The holes 12a and 12a are formed to penetrate therethrough. Since the holder 12 is formed by die-casting aluminum, it is possible to form a metal layer without performing a process of coating the aluminum layer with a synthetic resin.

  An opening 12b forms a space in the lower surface of the substrate portion, and a ring-shaped peripheral side surface 12d exposed to the outer surface is integrally formed on the outer peripheral portion of the disk so as to incline outward and obliquely upward.

  The outer diameter D2 of the holder 12 that forms a disk is about 50 mm, and the height of the peripheral side surface 12d is about 7 mm. The heat radiation effect is better when the height dimension is increased to increase the area where the peripheral side surface is exposed to the outer surface.

  A lower end portion of each end portion 11b, 11c of the arc tube is inserted into a pair of support holes 12a, 12a of the holder 12, and a heat-resistant adhesive such as silicone is provided around each outer surface of the support hole and each end portion of the arc tube. Apply and fix. As a result, the arc tube 11 is supported on the top surface of the holder 12 which is a disk-shaped surface.

  At this time, the arc tube 11 is fixed to the holder 12 in a state where the filament electrodes 11 d and 11 d are located on the other side of the upper surface of the metal disk of the holder 12. Since the holder 12 that supports the arc tube 11 is made of aluminum, this surface becomes a light reflecting surface, and light emitted downward from the arc tube 11 is reflected upward on the upper surface of the aluminum, resulting in light loss. Does not occur. Further, the upper surface may be mirror-finished to improve the reflection performance.

  Note that the lead wire of the arc tube 11 is led into the space of the holder 12 and connected to an output terminal of a lighting circuit described later.

  Further, the narrow tube 11e passes through the support hole 12a of the holder 12, and further passes through the circuit board 13 of the lighting circuit to be described later, and the front end of the cover member 14 along which the main amalgam is sealed is inserted into the base 15. To be arranged.

  The circuit board 13 is mounted with a circuit component 13a constituting a lighting circuit for the arc tube 11, and the circuit component 13a is a component for constituting a lighting circuit for lighting the arc tube 11 at high frequency using an inverter or the like. Consists of electronic components such as diodes for rectifying commercial power supply voltage, electrolytic capacitors for smoothing, transistors or field effect transistors as switching elements, ballast windings that also serve as resonant inductors, capacitors for resonance, and components for switching control . The lighting circuit is constituted by, for example, a half-bridge type inverter circuit that generates a high frequency, and performs lighting control in which a lamp current within a range of 200 to 250 mA is supplied to the arc tube 11 during lighting.

  These circuit components 13a are mounted on both upper and lower surfaces of a circuit board 13 made of a printed circuit board having a disk shape with a diameter of about 40 mm, and relatively small components are mounted on the upper surface of the circuit board 13 and relatively large components. Are arranged so as to be located on the lower surface, and the circuit components arranged on the lower surface are arranged so that the cover member 14 and some components are accommodated in the space 15 a of the base 15.

  The circuit board 13 on which the circuit component 13a is mounted as described above is fitted into the opening on the lower surface of the holder 12 via a cap-shaped separator 13b serving as an electrical insulating member, and is made of a heat-resistant adhesive such as silicone. Fix it.

  The separator 13b has a shallow cap shape and is made of a heat-resistant and electrically insulating synthetic resin such as polybutylene terephthalanol (PBT), and the circuit board 13 is fitted into the opening of the cap to form silicone. Fix with heat-resistant adhesive such as.

  The assembly of the separator 13b and the circuit board 13 integrated in this way is fixed in the opening 12b of the holder 12 so that the separator 13b is interposed between the holder 12 and the circuit board 13.

  Thereby, the holder 12 and the circuit board 13 which are metal are supported by the holder 12 in the state electrically insulated by the separator 13b. At the same time, the circuit board 13 is supported while being thermally insulated from the holder 12.

  A pair of small holes are formed in the separator 13b, and a lead wire and a thin tube 11e of the arc tube 11 are inserted into the small holes and connected to an output terminal of the circuit board 13.

  The cover member 14 has a substantially conical cylindrical shape having openings at the top and bottom, and is made of a heat resistant synthetic resin such as polybutylene terephthalanol (PBT).

  The cover member 14 has an outer surface that is inclined upward and substantially continuous with the outer surface of the peripheral side surface 12d of the holder, and forms a substantially continuous surface that approximates the silhouette of a general incandescent bulb.

  A base 15 is fitted and supported on the outer surface of the opening at the other end below the cover member 14. The base 15 is made of a conductive metal material, and is attached by being electrically connected to a socket wired and connected to a commercial power source by means of screwing or the like. For example, the base 15 is made of an E26 type base, A space portion 15a is formed on the outer surface and a male screw portion 15b is formed on the outer surface. The base 15 and the input terminal of the circuit board 13 are electrically connected by a lead wire.

  The globe 16 is formed of glass so that an opening is formed on the base end side, and is formed to have a smooth curved surface that is substantially the same shape as the glass bulb of the reflective bulb. A reflective film 16a is formed on the inner surface of the base end side of the globe 16 by vapor deposition of aluminum, and a transparent light transmitting part 16b is provided on the top side where the reflective film 16a is not formed. The reflection film 16a is formed up to the maximum outer diameter portion of the globe 16, and one side (the top side) from the maximum outer diameter portion is a light transmitting portion 16b. The globe 16 may be formed of a synthetic resin.

  The opening end below the globe 16 is fitted into a recess formed on the inner surface of the peripheral side surface 12d of the holder and fixed with a heat-resistant adhesive such as silicone.

  The bulb-type fluorescent lamp configured as described above has a maximum outer diameter D1 of the globe of about 90 mm, a total height H1 of about 133 mm, a lamp power including circuit loss of 24 W or less, and a total luminous flux. Is configured as a compact and high-power bulb-type fluorescent lamp with an E26 base of approximately 1000 lumens (lm) or more, and can be replaced with an incandescent bulb equivalent to 100W, screwed into the sockets of various lighting fixtures, and a lighting circuit Turns on and lights up.

  When the bulb-type fluorescent lamp configured as described above is turned on, the temperature of the arc tube 11 rises to heat the air in the globe, and in particular, the temperature near the ends 11b and 11c having the electrodes 11d and 11d rises. The holder 12 is heated and the temperature rises due to heat conduction and heat dissipation from the hot air in the globe 16 and the ends 11b and 11c of the arc tube 11.

  However, in this embodiment, since the tube axes of the pair of end portions 11b and 11c of the arc tube 11 are arranged so as to be parallel to the spiral central axis of the intermediate portion, they are emitted from the filament electrodes 11d and 11d. The reflected heat is directly reflected by the reflective film 16a and radiated outward from the light transmitting portion 16b. For this reason, the temperature rise inside the globe 16 can be suppressed. Moreover, since the holder 12 is made of aluminum, a substance that causes discoloration and white turbidity due to long-term high temperature lighting and ultraviolet irradiation does not deposit. For this reason, even if the holder 12 is visually observed from the translucent part 16b, it is hardly felt that the holder 12 has deteriorated, and the translucent part 16b of the globe 16 is not clouded.

  Further, since the holder 12 is made of aluminum and has a good thermal conductivity, and the ring-shaped peripheral side surface 12d having a height of about 7 mm exposed to the outer surface is integrally formed on the outer peripheral portion, the holder 12 whose temperature has increased. The peripheral side surface 12d formed integrally is deprived of heat by convection with the outside air, and the entire holder is cooled.

  At this time, since the holder 12 is integrally formed with the peripheral side surface 12d, there is no heat conduction loss from the arc tube, and the holder 12 is effectively transmitted to the peripheral side surface 12d as a heat radiating portion and cooled by the outside air. As a result, the temperature of the entire holder 12 is lowered, and the temperature rise of the circuit board 13 and the circuit component 13a supported by the holder is suppressed. Furthermore, since the heat emissivity of aluminum is as low as 0.1 or less, heat radiation from the back surface of the holder 12 to the circuit board 13 side through the space portion can be suppressed to a low level.

  This bulb-type fluorescent lamp 1 has an external shape similar to the external shape defined in a general lighting bulb JIS C 7501 equivalent to a rated power of 100 W, and a height dimension H1 from the bottom of the base 5 to the top of the globe 16 is 130 mm to The range is 135 mm. Further, the maximum outer diameter D1, that is, the maximum outer diameter D1 of the globe 16 is in the range of 80 mm to 100 mm.

  The above dimensional relationship is optimal for the A-shaped configuration, but when the glove shape is a spherical G shape, the height dimension H1 is preferably 125 mm to 130 mm and the maximum outer diameter D1 is preferably 90 mm to 100 mm.

The spiral arc tube 11 has an inner diameter of 7.5 to 9.0 mm and a discharge path length of 5 between the electrodes.
The range is from 00 to 600 mm. As a result, the thermal influence on the lighting circuit for controlling the lighting of the arc tube 11 can be suppressed and the reliability of the circuit component 13a can be improved, and a light bulb shape corresponding to a compact and highly efficient general lighting bulb equivalent to 100W. A fluorescent lamp 10 is configured.

  Next, the structure of the lighting fixture which used the lightbulb-type fluorescent lamp comprised as mentioned above as a light source is demonstrated. As shown in FIG. 3, reference numeral 20 denotes a downlight type lighting fixture installed on a ceiling surface X of a store or the like, and a main body case 21 having a metal box shape having an opening 21a on the lower surface, and an opening 21a. It is comprised by the metal reflectors 22 fitted by.

  The reflector 22 is made of a metal plate such as stainless steel and is integrally formed with a decorative frame 22a around the lower surface. A socket 23 into which a cap of a bulb-type fluorescent lamp is screwed is disposed at the center of the upper surface plate of the reflector 22.

  The base 15 of the bulb-type fluorescent lamp 10 with the reflective globe described above is screwed into the socket 23. As a result, a downlight type lighting fixture in which the light bulb-shaped fluorescent lamp 10 having the spiral arc tube 11 is installed is configured.

  The lighting fixture configured in this manner irradiates light to a reflector in the vicinity of the socket arranged in the lighting fixture by making the light distribution of the light bulb shaped fluorescent lamp as the light source approximate that of a general incandescent bulb. The amount is sufficiently secured, and the instrument characteristics as the optical design of the reflector can be obtained.

The longitudinal cross-sectional view of the lightbulb-type fluorescent lamp which is embodiment of this invention. FIG. 2 is a partially cutaway longitudinal sectional view of FIG. 1. Sectional drawing which showed roughly the lighting fixture installed in the ceiling surface which is embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light-bulb-type fluorescent lamp, 11 ... Arc tube, 11b, 11c ... End, 11d ... Electrode, 12 ... Holder, 12a ... Insertion hole, 13 ... Lighting device, 14 ... Cover, 15 ... Base, 16 ... Globe, 16a ... reflective film, 16b ... translucent part.

Claims (3)

A pair of end portions are located on one side, an intermediate portion is formed in a spiral shape and extends to the other end side, and a tube axis of the pair of end portions is formed to be parallel to the spiral central axis of the intermediate portion. An arc tube with an electrode sealed at each of the pair of ends;
It has a metal substrate part, and the end of the arc tube is inserted into the insertion hole formed in the substrate part, and the end of the arc tube in a state where the electrode is located on the other side of the metal substrate part is fixed. A holder for supporting the arc tube;
A lighting device for lighting the arc tube;
A cover body provided with a base on one side, housing the lighting device inside, and having a holder attached so that the arc tube is disposed on the other side;
A globe in which a reflective film is formed on the base end side so that the top side becomes a translucent part, and an opening is attached to the holder side so as to cover the arc tube;
A bulb-type fluorescent lamp characterized by comprising:   The bulb-type fluorescent lamp according to claim 1, wherein the holder has a circumferential side exposed to the outside, and an opening of a globe is attached to the inside of the circumferential side. The bulb-type fluorescent lamp according to claim 1 or 2;
An instrument body equipped with this fluorescent lamp;
The lighting fixture characterized by comprising.

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