JP2003308807A - Fluorescent lamp and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp with an aperture having a simple structure and emitting a light with a blurred outline of the emitted light and to provide a lighting device having the same. <P>SOLUTION: This fluorescent lamp is provided with a narrow and long transparent airtight vessel 1 having the inside diameter of Di and the outside diameter of Do, a phosphor layer 4 disposed an inner side of the airtight vessel 1, discharge medium sealed inside the airtight vessel 1, paired electrodes 3 and 5 so disposed as to cause discharge of the discharge medium inside the airtight vessel 1, and a light shielding film 6 so disposed on the outer surface of the airtight vessel 1 that the width W extending along the tube axial direction forms the aperture 7 for leading the light satisfying the following inequality. The internal electrode 3 is connected to a power incoming terminal 8a and the external electrode 5 is connected to a power incoming terminal 8b, where Di<W<Do. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp having an aperture and a lighting device using the fluorescent lamp.

[0002]

2. Description of the Related Art A fluorescent lamp having an aperture suitable for use as a pointer for a meter is disclosed in, for example, Japanese Patent Laid-Open No. 3-2.
It is described in, for example, Japanese Patent No. 80354, and is conventionally known. The outer surface of this fluorescent lamp is covered with a light-shielding film except for the aperture portion. As the glass bulb, for example, an extremely thin hollow rod having an outer diameter of 3 mm or less is used. Then, one end of the fluorescent lamp is attached to the pointer shaft of the meter. Therefore, when the pointer shaft rotates, the fluorescent lamp also rotates and thus functions as a pointer.

In this type of fluorescent lamp, the shape is as thin and compact as possible, and an internal electrode is sealed inside one end of the glass bulb on the cantilever side in order to facilitate a cantilever structure. Strip-shaped external electrodes are arranged along the tube axis direction on the outer surface, and a high-frequency voltage is applied between these electrodes to discharge the electrodes. In addition to the thin glass bulb, the fluorescence emission is concentratedly derived from the aperture thinner than the glass bulb, so that the emission pointer becomes an extremely thin needle shape and the outline of the emission is clear. There is a feature called.

[0004]

However, there is a case where a light emission that does not have a clear outline and appears to be dimly emitted is required in terms of design. In response to such a requirement, the above-mentioned conventional method is used. However, there is a problem that the above fluorescent lamp cannot respond.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent lamp having an aperture which has a simple structure and which makes it possible to obtain light emission in which the outline of the light emission is blurred and a lighting device using the same.

[0006]

A fluorescent lamp according to the present invention comprises a slender transparent airtight container having an inner diameter of Di and an outer diameter of Do; a phosphor layer disposed on the inner surface side of the airtight container. A discharge medium enclosed in an airtight container; a pair of electrodes arranged in the airtight container so as to cause discharge of the discharge medium; a width W extending along the tube axis direction is lower; And a light-shielding coating provided on the outer surface of the airtight container so as to form an aperture for leading out light that satisfies the formula.

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

<Regarding Airtight Container> The airtight container need only be elongated and transparent and does not have to be made of a specific material. First, as for the constituent materials, if it is a soft glass such as soda lime glass, it is preferable because it is easy to manufacture and can be obtained at a relatively low cost, but hard glass such as borosilicate glass or quartz glass is preferable. It may be. If you need more
Materials other than glass are acceptable as long as the materials satisfy transparency and airtightness, and fire resistance and workability at the operating temperature of the fluorescent lamp, and may be transparent ceramics such as aluminum oxide single crystal. .

Further, the airtight container is elongated. In the present invention, “elongated” means that the length in the tube axis direction is 5 times or more, preferably 10 times or more of the outer diameter, and the size of the outer diameter is not limited. However, in the case of a compact fluorescent lamp which is mainly used for display and for decoration, mainly for pointers, the outer diameter of the airtight container is preferably 5 mm or less, and more preferably 3 mm or less. Further, the inner diameter Di and the outer diameter Do of the airtight container are calculation elements when determining the width W of the aperture described later. In addition,
The airtight container has a generally circular cross section,
If necessary, the cross section may have an irregular shape such as an ellipse, an ellipse, or a quadrangle. When the cross-sectional shape is irregular, the inner diameter and outer diameter shall be determined by the average value. Further, the length of the airtight container is not particularly limited, but it is generally preferably about 50 to 300 mm. However, the shape in the tube axis direction is not particularly limited. For example, for pointers,
Generally, a straight tube is suitable. Further, it can be formed into a non-rectangular shape such as curved or bent according to each request for decoration, display, etc.

<Regarding Phosphor Layer> The phosphor layer is directly or indirectly formed on the inner surface of the airtight container. Indirectly means, for example, first forming a protective film or a reflective film, which will be described later, on the inner surface of the airtight container, and forming a phosphor layer on the inner surface of the airtight container through the protective layer or the reflective film.

Further, in the present invention, the phosphor layer is preferably formed on the entire inner peripheral surface of the airtight container. However, if necessary, it may be formed excluding the aperture portion described later. In this case, the aperture can also be formed by leaving the phosphor layer as it is without disposing the phosphor layer in a predetermined portion of the aperture of the airtight container. In addition to the aperture, a desired portion, for example, both end portions of the airtight container, where the phosphor layer is not formed, can be formed if necessary.

Further, the phosphor layer can be freely selected as a phosphor used for it, such as a three-wavelength emission type rare earth phosphor, a calcium halophosphate phosphor, and the like.
The emission color is generally white, but may be a specific color such as green, blue, or red if necessary.
In addition to the phosphor particles, particles of another substance, for example, fine particles of aluminum oxide, yttrium oxide, or the like may be mixed in the phosphor layer, if desired.

<Regarding Discharge Medium> The discharge medium radiates ultraviolet rays to excite the phosphor layer by the discharge generated between the pair of electrodes enclosed in the airtight container. Therefore, the discharge medium is not limited to a specific medium as long as it radiates ultraviolet rays by discharge, but in the case of a compact discharge lamp for a pointer or the like, a rare gas can be used as the discharge medium. Noble gas is a preferable discharge medium because it has a small environmental load and is environmentally friendly. However, if necessary, it is permissible to enclose a metal such as mercury so as to cause a metal vapor discharge.

When the discharge medium is a rare gas, one or more of xenon, argon, krypton and neon can be used. For example, only xenon or a mixture of xenon and krypton is used. The rare gas filling pressure is allowed up to about 30 kPa.

<Regarding Paired Electrodes> The paired electrodes may be arranged in any of an internal electrode arrangement, an internal / external electrode arrangement and an external electrode arrangement. Hereinafter, each electrode arrangement will be briefly described.

The internal electrode arrangement is an electrode arrangement in which each pair of electrodes is an internal electrode. Then, each internal electrode is spaced apart and opposed to both inner ends of the airtight container and sealed. Then, the discharge medium is directly interposed between the internal electrodes to cause a discharge.

The internal / external electrode arrangement is an electrode arrangement in which one of a pair of electrodes is an internal electrode and the other is an external electrode. Then, the internal electrode is sealed inside the airtight container, for example, on one end side. The external electrode is arranged so as to extend along the tube axis direction on the outer surface of the airtight container.

The external electrode arrangement is an electrode arrangement in which all the paired electrodes are external electrodes. Then, the external electrodes are arranged on the outer surface of the airtight container so as to be spaced apart and opposed to each other substantially in parallel along the tube axis direction. However, the external electrodes are allowed to meander in the tube axis direction or have a sawtooth shape.

In the latter two of the above three electrode arrangements,
Since the discharge is generated via the dielectric material forming the wall surface of the airtight container, the generated discharge is a so-called dielectric barrier discharge. Further, the external electrode is formed in a band shape so as to be in close contact with the outer surface of the airtight container along the tube axis direction so that the dielectric barrier discharge is likely to occur.

The pair of electrodes is not limited to a pair. That is, the electrodes may be plural pairs, may be a pair of electrodes, or may be composed of three or more electrodes. For example, in the arrangement of the inner and outer electrodes, it is allowed to seal the inner electrodes on both end sides inside the airtight container with respect to one outer electrode.

<About the light-shielding coating> The light-shielding coating is directly or indirectly provided on the outer surface of the airtight container to optically define the aperture and the other portion. The aperture is a slit-shaped opening for extending light along the tube axis direction of the airtight container and having a width W formed on the surface of the airtight container. That is, the light emission of the discharge lamp is led to the outside exclusively through the aperture.

The light-shielding film may be made of any material. For example, prepare a coating agent in which powder of a light-shielding substance such as carbon is dispersed in a synthetic resin liquid, apply this coating agent to a predetermined place on the outer surface of the airtight container, and cure it to dispose it. You can In this case, the light-shielding coating has a black color. However, it may be a light-shielding film in which powder of a light-shielding substance having a metallic luster is dispersed or a light-shielding film formed of a metal vapor deposition film or the like.

In the present invention, the aperture constructed as described above is set so that its width W satisfies the following equation in relation to the inner diameter Di and the outer diameter Do of the airtight container.

Di <W <Do That is, the width W of the aperture is larger than the inner diameter Di of the airtight container and smaller than the outer diameter Do. By satisfying this condition, the object of the present invention can be achieved as will be described later.

<Regarding Other Configurations> Although not an essential component of the present invention, the function of the discharge lamp is added or the performance is improved by selectively adding the configurations listed below as desired. .

1 Protective Layer The protective layer is composed of a layer of metal oxide containing alumina fine particles as a main component and is formed on the inner surface of the airtight container. The protective layer is an alkaline component that exudes from the glass forming the airtight container and deteriorates the phosphor in the phosphor layer, or when mercury is used as the discharge medium, the glass is colored by being hammered into the airtight container. Suppress it. Further, by disposing a protective layer mainly containing γ-alumina fine particles, it is possible to enhance the initial electron emission action and improve the darkness characteristics.

2 Reflective Film The reflective film is composed mainly of particles of a reflective metal oxide such as titanium oxide, and is formed on the inner surface of the airtight container as an underlayer of the phosphor layer. By providing the reflective film excluding the aperture portion, visible light traveling from the phosphor layer to the wall surface of the airtight container is reflected and led out from the aperture to improve the brightness of the aperture.

3 Transparent Insulating Coating A transparent insulating coating can be provided on the light-shielding coating or in addition to the aperture. As the transparent insulating coating, for example, a transparent fluororesin coating or a transparent silicone resin coating can be used. As a result, durability and insulation can be improved.

4 Discharge Lamp Support Structure A support structure may be provided at one or both ends of the discharge lamp to mechanically support the discharge lamp. As the support structure, various known configurations are allowed to be adopted as appropriate, but for example, a base can be attached to the end or the end of the discharge lamp can be directly clamped and supported. In the case of a pointer discharge lamp, one end of the airtight container on the internal electrode side is supported in order to have a cantilever structure.

5 Power Receiving Terminal A power receiving terminal connected to the electrodes can be provided to supply power to the pair of electrodes of the discharge lamp. If the power receiving terminal is led out in the vicinity of the discharge lamp supporting structure, it becomes easy to support the discharge lamp and simultaneously connect the lighting circuit to the power receiving terminal.

<Operation of the Present Invention> In the present invention, since the width W of the aperture is smaller than the outer diameter Do of the airtight container and larger than the inner diameter Di, airtightness is maintained in the aperture of the airtight container on both sides of the aperture. At least a part of the thick portion of the container is exposed, so that the light guided to the outside from both sides is obliquely transmitted through the inside of the wall surface of the airtight container, and the outline of the aperture looks blurry.

In the fluorescent lamp of the invention of claim 2, the inner diameter is D
i is an elongated and transparent airtight container having an outer diameter of Do; a phosphor layer disposed on the inner surface side of the airtight container; a discharge medium mainly containing xenon enclosed in the airtight container; an airtight container One consists of an internal electrode arranged on one end side inside the airtight container so as to cause discharge of the discharge medium inside, and the other from an external electrode arranged on the outer surface facing the aperture described later in the airtight container. A pair of electrodes, and a light-shielding film disposed on the outer surface of the airtight container so as to form an aperture for leading out light having a width W extending along the tube axis direction that satisfies the following formula: It is characterized by doing.

Di <W <Do The present invention defines the structure of a fluorescent lamp suitable as a pointer. That is, the airtight container has an outer diameter of 5 as described above.
mm or less, preferably 3 mm or less.

The discharge medium is mainly composed of xenon,
Only xenon or a mixed gas of xenon and another rare gas such as krypton is used. Therefore, in combination with the electrode arrangement described later, relatively strong ultraviolet radiation can be obtained by the dielectric barrier discharge of the low pressure rare gas.

The internal electrode may be either a cold cathode or a hot cathode. However, since the cold cathode has a small electron emission amount and is suitable for downsizing, it is suitable for obtaining a downsized discharge lamp using the airtight container having a small diameter as described above. In addition, the cold cathode type internal electrodes are W, Mo,
It can be configured using a metal such as Ta and Ni, an alloy containing them as a main component, or a sintered body of these metals. Furthermore, the internal electrode may have a tubular shape, a plate shape, or a rod shape.

The external electrode is arranged on the outer surface of the airtight container at a position facing the aperture, for example, at a facing position,
It is preferably formed wider than the aperture. The external electrodes may be formed by adhering a thin plate of metal such as aluminum to the outer surface of the airtight container with an adhesive, or by applying, drying, and baking a conductive metal paste such as silver. . Further, if necessary, a metal may be deposited by vapor deposition or another deposition method to form the external electrode.

Further, it is preferable that the length of the outer electrode in the tube axis direction is long so that the length of the outer electrode further extends at least from the inner electrode of the aperture to a position farther than the end portion on the side of separation. Further, the end of the external electrode on the side separated from the internal electrode has a relatively large width, for example, by surrounding the exhaust tip-off part of the airtight container, the brightness on the exhaust tip-off part side can be improved. As a result, the brightness distribution in the tube axis direction can be easily balanced. The width of the external electrode may be larger than the width of the aperture, or may be equal to or smaller than the width of the aperture.

Thus, in the present invention, xenon as a discharge medium exhibits excimer emission due to the dielectric barrier discharge through the wall surface of the airtight container between the internal electrode and the external electrode, and radiates a relatively large amount of 172 nm ultraviolet light. To do. The ultraviolet rays excite the phosphor particles in the phosphor layer to generate visible light. The generated visible light is guided to the outside via the aperture, but since the thick parts of the airtight container are exposed on both sides of the aperture, the visible light emitted from both sides of the aperture is the meat of the airtight container. When it penetrates the thick part diagonally, it becomes easy to scatter and the outline looks blurry.

An illumination device according to a third aspect of the present invention comprises: an illumination device main body; a fluorescent lamp according to any one of the first and second aspects provided in the illumination device main body; and a lighting circuit for lighting the fluorescent lamp. It is characterized by being.

In the present invention, the "lighting device" is a broad concept including all devices that utilize the light emission of a fluorescent lamp, such as a meter pointer, a light emitting decoration device, an indicator light, a marker light, a lighting fixture, and a reading device. Device, backlight unit, and other scanners, copiers, facsimiles, or a combination of these devices, a liquid crystal display device having a backlight unit, and equipment incorporating the liquid crystal display device, such as a personal computer, navigation Equipment, personal digital assistants, liquid crystal television receivers, etc., and instrument panel lighting devices for vehicles such as automobiles.

The "illuminator main body" refers to the remaining portion of the illuminator excluding the discharge lamp and the lighting circuit.

The lighting circuit is a means necessary for lighting the fluorescent lamp, and can be arranged in the main body of the illuminating device or in a separated position. Further, the lighting circuit may preferably have a configuration such as an electronic high frequency pulse generation circuit or a high frequency sine wave AC generation circuit. When the fluorescent lamp is configured to perform the dielectric barrier discharge, the capacitance of the wall surface of the airtight container is connected in series between the electrodes, so that the external current limiting impedance can be omitted. However, an external impedance may be connected in series to adjust to the desired lamp current.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a pointer fluorescent lamp as an embodiment of the fluorescent lamp of the present invention, FIG. 1 is a front view, FIG. 2 is a bottom sectional view taken along the tube axis direction, and FIG. It is sectional drawing which follows the AA line of FIG. In each figure, 1 is an airtight container, 2 is a lead wire, 3 is an internal electrode, 4 is a phosphor layer, 5 is an external electrode, 6 is a light-shielding film, 7 is an aperture, and 8a, 8
b is a power receiving terminal.

The airtight container 1 has an outer diameter of 2.5 mm and an inner diameter of 1.
The glass bulb has a thickness of 0.5 mm, a thickness of 0.5 mm, and a total length of 60 mm, and has a hemispherical shape at one end and has a needle shape as a whole. And, the base end side is the pinch seal part 1
and a tip side constitutes a hemispherical exhaust tip-off portion 1b. The airtight container 1 has an inner diameter of Di and an outer diameter of Do.

The lead-in wire 2 penetrates the pinch seal portion 1a of the airtight container 1 in an airtight manner, has a tip protruding into the airtight container 1 and a base end folded back along the outer surface of the pinch seal portion 1a. Has been.

The internal electrode 3 is a cold cathode made of a Ni tube, and is supported by welding at the tip of the lead-in wire on the base end side inside the airtight container 1. In order to seal the internal electrode 3 inside the airtight container 1, an electrode mount formed by welding the internal electrode 3 to the tip of the lead-in wire 3 in advance is formed, and the glass tube before the formation of the airtight container 1 is formed. The electrode mount is inserted from one end of the glass tube to place the internal electrode 3 inside the glass tube, and then one end of the glass tube is heated and melted to perform pinch sealing. This allows the pinch seal portion 1a to be attached to one end of the glass tube.
Is formed, the lead-in wire 2 is hermetically glass-welded to the pinch seal portion 1a, and the internal electrode 3 is formed inside the glass tube.
Is sealed. A reduced diameter exhaust pipe is formed at the other end of the glass pipe.

The phosphor layer 4 is mainly composed of a three-wavelength light emitting rare earth phosphor, and is arranged all around the inner surface of the airtight container 1. The phosphor layer 4 is formed by previously applying a phosphor suspension to the inner surface side of the glass tube before sealing the internal electrode 3 and firing the glass tube.

Inside the airtight container 1, about 500 to 10,000 Pa of xenon is enclosed as a discharge medium.
Before the discharge medium is sealed in the airtight container 1, the airtight container 1 is exhausted through a preformed exhaust pipe (not shown). Then, after exhausting, the discharge medium is sealed in the airtight container 1 via the exhaust pipe, and finally the exhaust pipe is heated and melted to be completely sealed, whereby the exhaust tip-off portion 1b is formed in the portion. .

The external electrode 5 is formed by applying a silver paste in a ribbon shape along the tube axis direction of the airtight container 1 and firing it. Further, the external electrode 5 has a tip reaching the exhaust tip-off portion 1b of the airtight container 1 and a wide tip end so as to surround the exhaust tip-off portion 1b.

The light-shielding coating 6 is formed by kneading carbon powder in an epoxy resin, and is provided on the outer surface of the airtight container 1 except for an aperture 7 which will be described later.

The aperture 7 is formed by not forming the light-shielding coating 6 along the tube axis direction of the airtight container 1 and facing the external electrode 5, and its width is W.
Then, the width W of the aperture is determined by the inner diameter D of the airtight container 1.
The relationship between i and the outer diameter Do satisfies the following equation.

Di <W <Do Each of the power receiving terminals 8a and 8b is made of a conductive material obtained by applying and firing a silver paste, and is surrounded by the inner electrode 3 and the outer electrode 5 in the vicinity of the base end of the discharge lamp. It is led out so as to be exposed on the surface portion. That is, the power receiving terminal 8a is formed by applying silver paste to the folded-back portion of the lead-in wire 2 led out from the pinch seal portion 1a to the back surface and firing it, and extending to the peripheral surface of the base end of the pinch seal portion 1a. Are arranged. Also, the power receiving terminal 8b
Is connected to the base end of the external electrode 5 and is filled with silver paste in the pores formed in a part of the light-shielding coating 6, coated and baked to connect to the base end of the external electrode 5. Has been done.

FIG. 4 is a partially sectional exploded perspective view showing a pointer portion of a meter device as an embodiment of the lighting device of the present invention. In the figure, 11 is a pointer shaft, 12 is a pointer holder,
Reference numeral 13 is a pointer fluorescent lamp.

The pointer shaft 11 is led out from a meter body (not shown).

The pointer holder 12 comprises a base 12a and power supply clip terminals 12b and 12c. The base body 12 a has a gutter shape and is fixed to the upper end of the pointer shaft 11. The power supply clip terminals 12b and 12c are arranged in an insulating relationship with each other inside the base body 12a so as to be separated from each other, and are connected between output ends of a lighting circuit (not shown).

The pointer fluorescent lamp 13 is shown in FIGS.
It has the same structure as shown in.

Then, when the base end of the pointer fluorescent lamp 13 is pushed into the pointer holder 12 from above, the power receiving terminal 8a is pressed into the power feeding clip terminal 12b, and the power receiving terminal 8b is pressed into the power feeding clip terminal 12c. At the same time as the pointer fluorescent lamp is mechanically supported, it is electrically connected between the output terminals of the lighting circuit to serve as a light emitting pointer.

[0059]

According to the invention of claim 1, an elongated transparent airtight container having an inner diameter of Di and an outer diameter of Do, a phosphor layer, a discharge medium, and discharge of the discharge medium are generated. A pair of electrodes arranged and a width W extending along the tube axis direction
Is provided with a light-shielding film disposed on the outer surface of the airtight container so as to form an aperture for derivation of light that satisfies the following formula, so that the outline of light emission is blurred while having a simple configuration. It is possible to provide a fluorescent lamp with an aperture that provides visible light emission.

Di <W <Do According to the second aspect of the present invention, a long and transparent airtight container having an inner diameter of Di and an outer diameter of Do, a discharge medium mainly containing xenon, and discharge of the discharge medium are generated. As described above, a pair of electrodes, one of which is an internal electrode disposed on one end side inside the airtight container and the other of which is an external electrode disposed on an outer surface facing the later-described aperture of the airtight container, and a width W By providing a light-shielding coating provided on the outer surface of the airtight container so as to form an aperture for leading out light that satisfies the expression, a meter capable of obtaining light emission in which the contour of the light emission looks blurred A fluorescent lamp suitable as a pointer can be provided.

Di <W <Do According to the invention of claim 3, the lighting device main body, the fluorescent lamp, and the lighting circuit are provided.
It is possible to provide a lighting device having the effects of (2) and (2).

[Brief description of drawings]

FIG. 1 is a front view showing a pointer fluorescent lamp as an embodiment of the fluorescent lamp of the present invention.

FIG. 2 is a bottom sectional view along the tube axis direction.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an exploded perspective view, partly in section, showing a pointer portion of a meter device as an embodiment of a lighting device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Airtight container, 3 ... Internal electrode, 4 ... Phosphor layer, 5 ... External electrode, 6 ... Light-shielding film, 7 ... Aperture, Di ... Inner diameter of airtight container, Do ... Outer diameter of airtight container, W ... Aperture width

Claims (3)

[Claims] 1. An elongated transparent airtight container having an inner diameter Di and an outer diameter Do; a phosphor layer disposed on the inner surface side of the airtight container; a discharge medium sealed inside the airtight container; A pair of electrodes arranged to cause discharge of the discharge medium inside the airtight container; a width W extending along the tube axis direction so as to form an aperture for derivation of light satisfying the following formula: And a light-shielding coating provided on the outer surface of the airtight container. Di <W <Do 2. An elongated and transparent airtight container having an inner diameter of Di and an outer diameter of Do; a phosphor layer disposed on the inner surface side of the airtight container; and mainly composed of xenon enclosed in the airtight container. And a discharge medium for discharging the discharge medium inside the airtight container, one of which is an internal electrode disposed at one end side of the inside of the airtight container, and the other is on an outer surface facing an aperture described later of the airtight container. A pair of external electrodes, which are arranged on the outer surface of the airtight container so that a width W extending along the tube axis forms an aperture for guiding light that satisfies the following formula: A fluorescent lamp comprising: a light-shielding film. Di <W <Do 3. A lighting device comprising: a lighting device main body; a fluorescent lamp according to claim 1 or 2 disposed in the lighting device main body; and a lighting circuit for lighting the fluorescent lamp. .