KR20070046177A - Circular fluorescent lamp and lighting apparatus - Google Patents

Abstract

The annular fluorescent lamp of the present invention has a pair of filament electrodes (9, 10), each of which is sealed at both ends (2a, 2b), a phosphor layer formed on the inner surface, a discharge medium encapsulated therein, and annularly opposite to both ends. Along the valve outer surface between the formed annular valve 2 and the outer leads 7a, 7b, 8a, and 8b respectively connected to the pair of filament electrodes and extending outwardly from both ends of the valve, respectively. The hollow cylindrical detention main body 5 installed so that rotation is free, the detention pins 5c, 5c, ... which are provided on the outer surface of this detention main body and connected to the outer lead, and the outer lead in the detention main body in the radial direction of detention It is provided as if it is wound around each other, and is provided with the detention which has the lead wire regulation part 14a, 14b, 15a, 15b which regulates the rotation angle of the detention main body. According to the above configuration, it is possible to provide an annular fluorescent lamp and a lighting device capable of regulating the rotational angle of the detention to a predetermined range without forming a restricting member such as a projection on the valve side as the detention rotation angle regulating means.

Detention, annular fluorescent lamps, columnar leads

Description

Circular fluorescent lamps and lighting fixtures {CIRCULAR FLUORESCENT LAMP AND LIGHTING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annular fluorescent lamp having a detention (metal part of a light bulb fitted to a socket-socket) rotating at a predetermined angle with respect to an annular valve, and a lighting apparatus having the annular fluorescent lamp.

Conventionally, as an example of this kind of annular fluorescent lamp, there exists a thing of patent document and Unexamined-Japanese-Patent No. 11-162329. The annular fluorescent lamp described herein has an annular concave portion at one end of both end portions of an annular glass valve in which the detention is outer ringed. A plurality of regulating members are fixed in the annular recess in the circumferential direction, and protrusions protruding between the regulating members are formed on the inner surface of the detention.設 -extruded).

Thus, the angle at which the projections of the detention can be displaced between the restricting members on both sides thereof.

Although the detention can be rotated with respect to the valve, further rotation can be regulated.

However, in such a conventional annular fluorescent lamp, there are fewer end portions of the annular valve.

In addition, while the fixing members are fixed in the annular recesses in one direction, protrusions protruding in the gaps between the restricting members must be protruded on the detention side, and the configuration thereof is not necessarily simple. There is a problem that a gap is likely to occur in the rotation control angle of the detention due to the positioning accuracy of the restricting member and the projection.

Moreover, in general, when the shape of the annular valve is annular, the detention is also curved like the curvature of the annular valve. For this reason, only detention centers

When turning around, the direction of curvature of the detention and the annular valve is shifted from each other, but when the predetermined angle of rotation is established, the inner surface of the detention and the outer surface of the end of the annular valve are combined to prevent rotation, so the rotation angle of the detention is relatively easy. It can be regulated.

However, in the annular shape of the annular valve,

When the opposite ends are arranged almost linearly, the caps provided between the both ends of these valves are also almost straight. For this reason, when the detention is not connected to the valve via the lead wire, since the detention of the detention is structurally unlimited, a means for reliably regulating the rotational angle is necessary.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an annular fluorescent lamp capable of regulating the rotation angle of the detention to a predetermined range without forming a restrictive member such as a projection on the valve side as a rotation angle regulating means, and It is to provide a lighting fixture.

Both ends of the annular fluorescent lamp of the present invention provided to achieve the above object

An annular valve having a pair of filament electrodes sealed to each part, a phosphor layer formed on an inner surface, a discharge medium encapsulated therein, and formed in an annular shape so that both ends thereof face each other, and each end of the pair of filament electrodes A pair of lead wires each connected to each other and installed so as to be freely rotatable along the outer surface of the valve across a pair of lead wires extending from both ends of the valve to the outside, and between the both ends of the valve, the detention body A detention pin which is provided on the outer surface side of the detention main body and connected to the lead wire, and is installed in the detention main body as if the lead wires are wound around each other in the radial direction of the detention main body, and the rotation angle of the detention main body is regulated within a predetermined range. It is characterized by having a detention provided with a lead wire regulating member.

In addition, said lead wire is connected to each edge part of a filament electrode, and is wired so that a little space may be provided to a length in a metal mold | die.

Further, according to the most suitable embodiment of the present invention, the lead wire restricting member is

The rotation angle of the metal main body may be regulated within the range of 90 ° to 270 °, preferably within the range of 90 ° to 120 °.

It is also preferable that the lead wire restricting member is a columnar rib provided to protrude inwardly from the inner surface of the cap body. In this case, the detention main body is composed of a semi-cylindrical first detention body provided with the detention pin and columnar ribs, and a semi-cylindrical second detention main body joined with the first detention body. On the inner surface of the second detention main body, a displacement regulating member may be provided which abuts the columnar rib to regulate the displacement of the lead wire to the second detention main body side.

In addition, it is preferable that the lead wire restricting member separates the pair of lead wires from each other over a pair of capping pin spacings to which a pair of lead wires extending from each filament is connected.

Moreover, the said objective is providing the lighting fixture provided with the annular fluorescent lamp which prepared the said structure, the lighting fixture main body which can install this annular fluorescent lamp, and the lighting circuit which supplies electric power to this annular fluorescent lamp. Is achieved.

In the annular fluorescent lamp of the present invention having the above characteristics, and a lighting fixture having the same

According to this, when the detention rotates, the lead wire is pulled in the axial direction by that amount, and the tensile limit thereof is regulated by the lead wire regulating member, so that further rotation of the detention is restricted. That is, the rotation angle of the detention is regulated by the tensile limit of the lead wire.

In addition, since the lead wire restricting member is wired so as to bypass the lead wires on the outside of the caps placed close to each other, the lead wires adjacent to each other can be prevented from being shorted in contact with each other.

Further, according to the most suitable embodiment described above, since the whole of the cap is rotated in the range of 90 ° to 270 °, preferably in the range of 90 ° to 120 °, the detachability to the lighting fixture main body socket can be improved. have. In addition, since the lead wire restricting member is a columnar rib of the detention, the structure of the lead wire restricting member is simple and can be easily formed integrally with the whole of the detention by a mold of the entire detention or the like.

In addition, even if a pair of lead wires is pulled out of the lead wire restricting portion,

It is possible to prevent the lead wires from being displaced toward the second metal main body side and in proximity or contact with each other. For this purpose, it is possible to reliably prevent the rotational restrictions of detention and shorting between a pair of lead wires.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view of the principal part of the annular fluorescent lamp which concerns on one Embodiment of this invention.

FIG. 2 is a plan view of the main parts for explaining an operation in which the rotation angle is restricted when the ring of the annular fluorescent lamp shown in FIG. 1 is rotated. FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 after the first cap body shown in FIG. 1 is joined to the second cap body and assembled into the cap.

FIG. 4 is a partially open plan view showing the overall configuration of an annular fluorescent lamp with a cap including the first cap body shown in FIG. 1.

FIG. 5 is an inner surface side plan view of the first cap body shown in FIG. 1. FIG.

FIG. 6 is a plan view of the outer surface side of the first cap body shown in FIG. 5. FIG.

FIG. 7 is a front view of the first detention body shown in FIG. 5. FIG.

8 is a right side view of FIG. 5.

9 is a plan view of the inner surface side of the second cap body according to the embodiment of the present invention.

10 is a right side view of the second detention body.

It is a top view of the lighting fixture which concerns on 2nd Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on an accompanying drawing. In addition, in these attached drawings, the same code | symbol is attached | subjected to the same or equivalent part.

Fig. 1 is an enlarged cross-sectional view showing the detention portion of the annular fluorescent lamp according to the embodiment of the present invention, a state before the detention is rotated, and Fig. 2 shows a state in which rotation is restricted. 3 to 10 are views showing the overall configuration of the annular fluorescent lamp as described above, and the configuration of the detention body.

Fig. 4 shows an annular fluorescent lamp formed in a conical shape in the same planar shape, and the annular fluorescent lamp 1 is arranged so as to face opposite ends 2a and 2b of the glass valve 2 at required intervals. On the outer surface of (2a, 2b), the hollow cylindrical mold | die 3 is attached so that it may span between these both ends 2a and 2b. Also, the detention 3 is provided at both ends of the valve.

The tube shafts of (2a, 2b) are fitted so as to rotate freely along the outer surface of the valve (2) so as to be substantially the center of rotation.

The valve 2 is formed in a substantially square shape on one plane by, for example, bending one straight pipe-shaped glass valve, and includes a plurality of straight pipe portions 2c, 2c,... Bends 2d, 2d,...

The outer diameter of the tube of each straight pipe portion 2c is, for example, in the range of 12 to 20 mm, and the optimum range of the outer diameter of the tube is 14 when considering lamp characteristics such as lamp efficiency and manufacturing conditions. 18 mm. Moreover, although it is thought that the straight pipe part 2c near the bend part 2d may change the outer diameter of a pipe a little and partially deviate from the said range in the bending process of a bend part, in the case of this invention, the straight pipe part 2c Most of these should just be in the said range. In addition, the thickness of the straight pipe portion 2c is preferably about 0.8 to 1.2 mm.

The valve 2 is formed of soft glass such as soda lime glass, but may be semi-hard glass such as heat-resistant glass. The thickness of the valve is preferably about 0.8 to 1.2 mm, but is not limited thereto.

The phosphor layer (film) 4 applied to the inner surface of the valve 2 is formed in the entire straight tube-shaped glass valve 2 before the formation of the bent portion 2d.

The phosphor constituting the phosphor layer 4 can be composed of known phosphors such as a three-wavelength luminescent phosphor and a halo phosphate phosphor, but from the viewpoint of luminous efficiency, use of the three-wavelength luminescent phosphor is preferable.

As a three-wavelength luminescent phosphor, BaMg ₂ Al ₁₆ O ₂₇ is a blue phosphor having an emission peak wavelength around 450 nm. : Eu ^{2 +,} as a green-based fluorescent material having a luminescence peak wavelength at 540nm (La, Ce, Tb) PO 4, Y 2 O 3 as the red color-base phosphor having the luminescence peak wavelength at 610nm Eu ³⁺ and the like are applicable, but are not limited to these.

In addition, a protective film (not shown) may be interposed between the inner surface of the valve 2 and the phosphor layer 4. As a protective film, what consists of metal oxide fine particles is suitable.

As the metal oxide fine particles, fine particles such as aluminum (Al ₂ O ₃ ) or strontium phosphate (Sr ₂ P ₂ O ₇ ) can be used.

The detention (3) is PBT (polybutylene terephthalate) and PET (polyethylene terephthalate)

A first cylindrical main body (P body) 5 having a semi-cylindrical shape formed in a substantially linear cylindrical shape by synthetic resins such as phthaletone) and PC (polycarbonate), and FIG. As shown in FIG. 3, the semi-cylindrical 2nd main body (M body) 6 shown to FIGS. 9-10 combines the radial opening edges, and the cylindrical shape of an opening of both ends of an axial direction is carried out. Is formed.

As shown in FIG. 6, FIG. 7, the 1st metal main body 5 forms the horn-shaped recessed part 5a in the substantially center part of the outer surface, and shows the recessed part 5a. On the bottom portion 5b, four hollow cylindrical pins 5c, 5c,... Are arranged in a substantially square lattice shape and placed vertically. The inner and outer ends of each of the detention pins 5c are opened.

As shown in Fig. 5, a circumferential rib 5d protrudes from the center portion of the square lattice arrangement of these detention pins 5c, 5c ..., and an installation screw not shown in this rib 5d. An insertion hole 5e for inserting a hole is drilled.

FIG. 5 shows the inner surface of the first detention body 5, wherein each detention pin 5c is a symbol of the inner surface of the first detention body 5.

The lead insertion hole 5ca is respectively opened in the bottom surface. In each of the lead insertion holes 5ca.

The outer leads 7 and 8, which are a pair of left and right pairs of lead wires shown in FIG. 1, are respectively inserted, and each of the detention pins 5c is formed by caulking, welding, or the like of the detention pins 5c, 5c, ..., respectively. ,

5c,... ) Is mechanically and electrically connected.

As shown in FIG. 1, each pair of outer leads 7 and 8 has a pair of upper and lower pairs 7a, 7b, 8a, and 8b in the figure. In addition to the outer leads 7 and 8, the lead wires include a pair of inner leads 9a for supporting axial ends of the pair of electrodes 9 and 10 which are respectively sealed in the valve ends 2a and 2b. , 9b, 10a, 10b) and glass stamp

It consists of sealing lines 9c, 9d, 10c, and 10d enclosed by the stems 11 and 12, and it extends to the outside by hermetically penetrating the both ends 2a and 2b of the valve as a whole. In at least one direction of the pair of left and right stems 11 and 12 in FIG. 1, an exhaust pipe 13 made of glass tubing communicating with the valve 2 is provided. In the valve 2, mercury and rare gas are enclosed as a discharge medium. However, as this discharge medium, mercury is omitted and white

(Iii) Only gas may be enclosed in the valve 2.

As shown in FIG. 1, the first detention main body 5 has a pair of upper and lower footnotes in FIG. 1 on the left and right pairs of side surfaces of the inner surface of the bottom 5b of the yaw portion 5a. Lead wire regulating ribs 14a, 14b, 15a, and 15b in the form of) -square columns are integrally formed as lead wire restricting members, respectively.

Protrude to install. Each lead wire regulating rib as shown in FIG. 1 or 5

14a, 14b, 15a, and 15b are provided at positions passing outside the radial direction of the square lattice array of the detention pins 5c. That is, the lead wire regulating ribs 14a, 14b, 15a, and 15b are formed in the first detention as if the pair of outer leads 7 and 8 are wound around each other in the radial direction of the detention bodies 5 and 6, respectively. It is provided in the main body 5 inner surface. 1 and 5

Reference numerals 16a and 16b indicate that the upper and lower pairs of engaging projections 17 of the first detention body 5 stand up substantially perpendicularly from the inner surface of the first detention body 5 to the inside, and the tip end of the valve end 2b. (先

Iii) A foot-shaped positioning rib that abuts to a substantially central portion of the outer surface and determines the installation position when the detention 3 is installed in the valve 2.

As shown in the inner-surface plan view of FIG. 9, the 2nd metal main body 6 screwed to the installation screw which is not shown in the substantially center part of the inner bottom face. A pair of upper and lower pairs in which the columnar ribs 18 of the columnar ribs 18 are formed to protrude, and the coupling holes 19a between the upper and lower portions of the columnar ribs 18 are formed. The cylindrical ribs 19 and 19 are protruded and provided, respectively. These ribs 19 and 19 have a pair of upper and lower coupling protrusions of the first metal main body M body 5 in the coupling holes 19a and 19b.

Positioning is carried out by engaging 16a and 16b, respectively, and in this state, a mounting screw (not shown) is joined by screwing into the screw hole 18a through the insertion hole 5e, and the cylindrical detention part 3 ) Is configured.

In addition, as shown in the right side view of FIG. 10, the second detention main body 6 has the upper and lower pairs of displacement regulating ribs 20a, 20b, 21a, and 21b. Is installed to protrude integrally.

As shown in Fig. 3, these displacement restricting ribs 20a, 20b, 21a, 21b are

The free end surface of the opening end side of the 2nd metal main body 6 has each lead wire regulation rib.

It is provided in the position which abuts on the free front end surface of 14a, 14b, 15a, 15b. In addition,

The free end face of the opening side of the second detention body 6 and the free end face of the lead wire restricting ribs 14a, 14b, 15a, and 15b may not necessarily be in contact with each other, and there may be a gap between these free end faces. . However, this gap is required to be a small gap smaller than the diameter of the outer leads 7a, 7b, 8a, and 8b. For this reason, the outer leads 7a, 7b, 8a, and 8b are lead wires.

Displaced over the regulating ribs 14a, 14b, 15a, and 15b to the second detention main body 6 side, and the movement of the pair of outer leads 7, 8 or 9, 10 in close proximity to each other. I can regulate it.

An example of the main dimension of the detention 3 comprised in this way is as follows.

[First Detention Body 5 (see Fig. 5)]

Overall length: 50.0 ± 0.5mm

Outer Diameter: 19.6 ± 0.5mm

Bottom portion 5b of the yaw portion 5a Length: 20.0 ± 0.3mm

Opposite spacing between a pair of lead wire regulating ribs 14a and 14b, 15a and 15b opposed to each other in the radial direction of the first detention body 5: 9.0 ± 0.3mm

Length of one side of the axial orthogonal cross section of each lead wire regulating rib 14a, 14b, 15a, 15b:

2.0 ± 0.5mm (However, if the lead wire restricting rib is cylindrical, it is converted to the outer diameter.)

Longitudinal dimension from the center of each detent pin 5c to each lead wire regulating rib 14a, 14b, 15a, 15b: 6.0 ± 0.3mm

[Second detention body 6 (see Fig. 9)]

Overall length: 50.0 ± 0.5mm

Outer Diameter: 19.6 ± 0.5mm

A pair of displacement regulating ribs 20a and 20b, 21a and 21b opposed to each other in the radial direction of the first detention body 5 are 9.0 ± 0.3 mm

Thickness of each displacement regulating rib 20a, 20b, 21a, 21b (dimension of the length direction of the second detention body 5): 2.0 ± 0.5mm

Next, the operation of the annular fluorescent lamp 1 will be described.

First, in the case where the caps 3 are provided on the outer surfaces of both ends 2a and 2b of the valve 2, as shown in FIG. After passing through the radially outer side of the regulating ribs 14a, 14b, 15a, 15b, each of the detention pins 5c

Passes through the insertion hole (5ca). Then, the first detention main body 5 of the detention 3 is covered between the valve end portions 2a and 2b, and the one end of the valve, for example, the outer end surface of the end 2b. The positioning ribs are positioned in contact with the positioning ribs 17. Next, the prisoners 3 are inserted such that the outer lids 7a, 7b, 8a, and 8b in the inserted state are slightly in a state as shown in FIG. 1. The lengths of the outer leads 7a, 7b, 8a, and 8b are secured, and fixed to each of the detention pins 5c by caulking in the radial direction of the outer end of each detention pin 5c. .

Then, the opening end of the second detention main body 6 is covered on the opening end of the first detention main body 5, and the respective engaging projections 16a and 16b of the first detention main body 5 are second detained. Engaged in and positioned in the respective engagement holes 19a and 19b of the main body 6.

After this, a mounting screw (not shown) is inserted into the screw insertion hole of the first detention body 5.

(5d) is inserted into the screw hole 18a of the columnar rib 18 of the second prisoner main body 6, and inserted into the screw hole 18a, and the first prisoner main body 5 and the second prisoner main body ( 6) are firmly combined.

In this way, after attaching the detention 3 to the valve 2, Fig. 2 (Fig.

As shown in (2a, 2b) shows a state in which it rotates relatively around the axial center.) The detention 3 is rotated in one direction around the axial center of the valve both ends 2a and 2b.

2, for example, the middle of the upper outer lead is brought into contact with the upper surface of the upper wiring regulating ribs 14a and 15a in the figure and pulled in the axial direction. For this reason, when the upper outer leads 7a and 8a reach the tension limit and become taut, the tension to return to the anti-rotation direction increases, and when the motor rotates to a predetermined rotation angle, the detention 3 The angle of rotation reaches the limit, and further rotation is regulated.

In the case where the detention 3 is rotated in the opposite direction to this, the middle of the lower outer leads 7b, 8b in FIG. 2 is the lower lead wire regulating rib 14b, in FIG.

In contact with 15b), it becomes taut, and similarly, the rotation angle of the cap 3 can be regulated in the range of less than 360 °, for example, 90 ° to 270 °, preferably 90 ° to 120 °.

In addition, according to the annular fluorescent lamp 1, the valve both ends 2a,

Since it is not necessary to form an annular recessed part (concave part) in 2b), the ease and quickness of the process of the valve 2 can be improved. In addition, this invention does not prevent adoption of an annular recessed part, You may form an annular recessed part in the at least one edge part of the annular valve 2 as needed.

In addition, the rotation angle of the cap 3 can be regulated simply and reliably by a simple configuration in which the lead wire restricting ribs 14a, 14b, 15a, and 15b are simply formed in the cap 3.

In addition, by timely adjusting the length of the outer 7a, 7b, 8a, 8b, the detention 3

The angle of rotation can be adjusted simply and quickly.

Moreover, since the positioning rib 17 which positions the installation position of the valve 2 is formed in the metal mold | die 3, the positioning at the time of installing the metal mold | die 3 in the valve 2 can be made simple and quick. have.

In addition, each outer lead 7a, 7b, 8a, 8b is passed through the radially outer side of the lead wire regulating ribs 14a, 14b, 15a, 15b, so that each of the outer leads 7a, 7b, 8a, 8b is detained. It can be prevented from being twisted and contacted with each other during the rotation of (3).

However, the outer lead 7a, 7b, 8a, 8b may be covered with an electrically insulating tube (not shown) to further improve the reliability of the short prevention.

Moreover, in the said embodiment, a pair of left and right wiring regulating ribs 14a, 14b, 15a, 15b.

Although the case of installing each of these is demonstrated, this invention is not limited to this, For example, you may abbreviate | omit one of the left and right pair of wiring regulation ribs 14a, 14b, 15a, 15b.

Furthermore, in the said embodiment, although the case where only the outer lead 7a, 7b, 8a, 8b was wired to the outer side of the wiring regulation rib 14a, 14b, 15a, 15b was demonstrated, outer lead 7a, 7b, You may wind up the middle of 8a, 8b by the wiring regulation rib 14a, 14b, 15a, 15b.

11 is a plan view of the lighting fixture 31 according to the second embodiment of the present invention. this

The lighting fixture 31 is an annular fluorescent lamp 1 shown in FIG. 1 and this annular fluorescent lamp

And a mechanism main body 32 for attaching and detaching (1) freely, and a lighting circuit 33 provided in the mechanism main body 32 to supply electric power to the annular fluorescent lamp 1, have.

The instrument body 32 can be mounted to the ceiling, for example, and has a reflection not shown.

A holder such as a lamp holder, which is provided with a sieve, a lamp socket electrically connected to the lighting circuit 33, and an annular fluorescent lamp 1 to be detachably attached to the mechanism main body 32, is provided. Doing. The reflector is formed in the shape of a white quadrangular horn, for example, and is provided in a concentric shape inside the annular fluorescent lamp 1.

The lighting circuit 33 obtains electric power from a commercial power supply, converts it into high frequency electric power of a required frequency, and supplies it to an annular fluorescent lamp via a lamp socket.

According to this lighting fixture 31, the white reflector of the quadrangular shape of the fixture main body 32 is

Since the center of the quadrangular annular fluorescent lamp (1) is installed in a substantially concentric shape

As a result, the light distribution characteristic in the downward direction of the mechanism becomes quadrangular, and illumination can be almost uniformly applied to an illumination space such as a rectangular room.

Further, since the detention 3 of the annular fluorescent lamp 1 is rotatable in the range of 90 ° to 120 ° around its central axis, it is fitted with a lamp socket provided in the mechanism main body 32. Or the ease of connection can be improved.

According to the above configuration of the present invention, it is possible to provide an annular fluorescent lamp and a lighting device capable of regulating the rotational angle of the detention to a predetermined range without forming a restricting member such as a projection on the valve side as the detention rotation angle regulating means. .

Claims (5)

A pair of filament electrodes sealed on both ends and phosphors formed on the inner surface A discharge medium encapsulated in the layer and the inside, and has an annular shape so that both ends thereof face each other. An annular valve formed into a shape; A pair of lead wires respectively connected to respective ends of the pair of filament electrodes and extending outwardly from both ends of the valve; Installed so as to be free to rotate along the outer surface of the valve between both ends of the valve A hollow cylindrical detention main body, a detention pin provided on an outer surface side of the detention main body and connected to the lead wire, and installed in the detention main body by wrapping the lead wires in a radial direction of the detention main body. And a cap with a lead wire regulating member for regulating the rotational angle of the cap body within a predetermined range. According to claim 1, The said lead wire regulation member regulates the rotation angle of the said main body in a range of 90 degrees-270 degrees, The annular fluorescent lamp characterized by the above-mentioned. According to claim 1, And said lead wire restricting member is a columnar rib which protrudes inwardly from said inner surface of said detention body. The method of claim 3, wherein The detention main body is composed of a semi-cylindrical first detention body provided with the detention pin and columnar ribs, and a semi-cylindrical second detention body engaged with the first detention body. And a displacement limiting member that abuts against the columnar rib and regulates displacement of the lead wire to the second detention main body side. Annular fluorescent lamps, A luminaire main body provided with this annular fluorescent lamp; A lighting circuit for supplying electric power to the annular fluorescent lamp; The annular fluorescent lamp, An annular valve having a pair of filament electrodes sealed at both ends, a phosphor layer formed on an inner surface, and a discharge medium enclosed therein, the annular valves being formed in an annular shape so as to face the opposite ends; A pair of lead wires connected to respective ends of the pair of filament electrodes, respectively, and extending from both ends of the valve to the outside; It is designed to rotate freely along the outer surface of the valve across both ends of the valve. A detained hollow cylindrical detention main body, a detention pin provided on an outer surface side of the detention main body and connected to the lead wire, and installed in the detention main body such that the lead wire is wound around in the radial direction of the detention main body, and the detention main body Lighting fixture having a detention line with a lead wire regulating member for regulating the angle of rotation within a predetermined range.

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