JPH08264154A - Low pressure mercury vapor discharge lamp and lighting system - Google Patents

Abstract

PURPOSE: To reduce the variations of a light-emitting characteristic by fixing an amalgam within a predetermined range in the transparent and airtight container of a fluorescent lamp to emit a fixed quantity of mercury independent of a mounting direction. CONSTITUTION: A rare gas is enclosed in the glass bulb 1 of the airtight and transparent container of a fluorescent lamp having an annular form or the like, and an electrode 6 and the like are provided and at the same time a mercury amalgam 9 is fixed within the range of an angle θ=45 deg. in an upward and a downward directions with respect to a virtual plane H-H. With the constitution that the amalgam 9 is provided in the region having frequent temperature changes at the time of lighting, an emitting quantity of mercury is kept constant independent of whether the mounting direction is outside or inside and the nearly constant discharge of mercury can be achieved, so that a low pressure mercury vapor discharge lamp having a stable light-emitting characteristic may be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pressure mercury vapor discharge lamp in which amalgam of mercury is enclosed in a translucent airtight container composed of a glass bulb or the like, and an illuminating device equipped with this discharge lamp.

[0002]

2. Description of the Related Art A low-pressure mercury vapor discharge lamp, for example, a fluorescent lamp, has a transparent and airtight container composed of a tubular glass bulb and a rare gas such as mercury and argon enclosed as a discharge medium. In the transition spectrum of the above, the main source of light emission is the use of ultraviolet rays of 254 nm, 185 nm, etc. as the excitation source of the phosphor, and there are some lamps in which only a rare gas is enclosed. Encapsulation of mercury is essential for efficient lamps.

Since the luminous efficiency of this fluorescent lamp with mercury sealed depends on the mercury vapor pressure in the bulb forming the hermetic container, it is known that the internal mercury vapor pressure must be maintained within a predetermined range at the time of lighting. Has been. Therefore, when designing the lamp, it is important to set the temperature of the coldest part of the lamp, which controls the mercury vapor pressure, to the optimum mercury vapor pressure, and it is necessary to deal with it by forming a heat shield plate or a protrusion for cooling. I've been

As a method of enclosing mercury in the bulb in manufacturing the fluorescent lamp, liquid mercury is generally fed through an exhaust pipe connected to the end of the bulb, but mercury is enclosed because it is liquid. It was difficult to quantitatively seal the amount because the amount adhered to the device, the exhaust pipe, or the like, was adhered to the wall of the enclosing route, or the amount of the encapsulation was insufficient due to evaporation from the inside of the valve during exhaust at high temperature or the variation became large. For this reason, it was tried to supply excess mercury in anticipation of loss, but it is preferable to minimize the amount of mercury used for environmental conservation. After covering with an electrically stable powder, it was enclosed, but the problem has not been solved.

Further, when the fluorescent lamp is lit in a sealed instrument or in a place where the ambient temperature is high, the temperature of the coldest part rises, so that the mercury vapor pressure becomes higher than the optimum pressure and the efficiency is lowered.

To solve these problems, for example, mercury (Hg), bismuth (Bi), indium (In),
It is known to encapsulate an amalgam forming metal such as tin (Sn) as an amalgam. A lamp using amalgam has advantages that mercury vapor pressure is controlled, high efficiency is obtained over a wide temperature range even at a high ambient temperature, and mercury can be easily quantitatively sealed.

However, it has been found that the lamps containing the amalgam have variations in the light emission characteristics among the lamps.

[0008]

Therefore, the inventors of the present invention settled the position of the amalgam in the bulb (translucent airtight container) for the purpose of improving the variation in the light emission characteristics (luminous flux value) in the lamp containing the amalgam. As a result of various studies, there was a temperature difference in each part of the valve,
It was found that by controlling the fixed position of the amalgam, it is possible to obtain stable light emission characteristics without variation.

The present invention provides a low pressure mercury vapor discharge lamp having a small variation in emission characteristics between lamps in a lamp in which mercury is enclosed as an amalgam in an airtight container (bulb), and a lighting device equipped with this discharge lamp. With the goal.

[0010]

In a low-pressure mercury vapor discharge lamp according to claim 1 of the present invention, a tube-shaped glass bulb is bent or connected, and as a whole, one discharge path is bent in a virtual plane. Light-tight airtight container, electrodes provided in this light-tight airtight container, the rare gas sealed in the light-tight airtight container, when the virtual plane is horizontal, the central axis of the tubular glass bulb As described above, the amalgam is fixed in the translucent airtight container whose angle formed by the virtual plane is within the range of the central angle of 45 degrees above and below.

The low-pressure mercury vapor discharge lamp according to claim 2 of the present invention is characterized in that the translucent airtight container has an annular glass bulb.

The low-pressure mercury vapor discharge lamp according to claim 3 of the present invention is applied to a translucent airtight container including a straight tube glass bulb and a straight tube fluorescent lamp for general lighting.
A pair of pins mounted on both ends of a translucent airtight container in which the pins are arranged side by side, electrodes provided in the translucent airtight container, a rare gas enclosed in the translucent airtight container, and two pins When the plane including the pin of is a virtual plane and the plane is horizontal, it passes through the center of the straight tube type glass bulb, and the angle between the plane and the virtual plane is 45 degrees up and down. It is characterized by comprising an amalgam fixed in a container.

The low-pressure mercury vapor discharge lamp according to claim 4 of the present invention is characterized in that the amalgam is fixed to the inner wall of the airtight container at the end.

The low-pressure mercury vapor discharge lamp according to claim 5 of the present invention is characterized in that the hermetic container has a stem glass supporting the electrodes, and the amalgam is fixed to the stem glass.

According to a sixth aspect of the present invention, there is provided an illuminating device main body, and a translucent airtight container formed by bending one discharge path in a virtual plane as a whole in the illuminating device main body. The low-pressure mercury vapor discharge lamp according to any one of claims 1, 2, 4, and 5, which is mounted in a direction parallel to the virtual plane, and lighting of the low-pressure mercury vapor discharge lamp. And a circuit device.

According to a seventh aspect of the present invention, there is provided a lighting device main body, and the lighting device main body has two pins which are juxtaposed at both ends of a straight tube type translucent airtight container. , A plane including these two or more pins is a virtual plane,
The low-pressure mercury vapor discharge lamp according to any one of claims 3 to 5 mounted in a direction parallel to the virtual plane, and a lighting circuit device for the low-pressure mercury vapor discharge lamp. I am trying.

[0017]

In the inventions of claims 1 and 3, when the virtual plane of the glass bulb constituting the translucent airtight container is horizontal, the amalgam falls within a range of 45 degrees in the horizontal direction from the central axis of the bulb. However, when the lamp is turned on, the temperature of the side surface of the bulb is approximately in the middle of the temperature above and below, and the difference in temperature is small and almost the predetermined mercury emission as designed is possible.

The completed lamp is mounted on a fixture or the like with the virtual plane of the bulb horizontal, but there is no distinction between the upper surface and the lower surface of the lamp with respect to this virtual plane, but the lamp is mounted upside down. The angle formed by the amalgam with the virtual plane is within the range of the central angle of 45 degrees above and below (total 90 degrees). That is, the temperature of the amalgam does not change significantly even when the lamp is mounted upside down.

Further, according to the second aspect of the invention, the temperature of the amalgam does not largely change even when the airtight container is annular and the lamp is mounted upside down.

Further, in the inventions of claims 4 and 5, the temperature rise does not change significantly even if the amalgam is installed upside down and the lamp is mounted upside down, and the difference in temperature is small. Can release a certain amount of mercury,
Further, the amalgam can be firmly fixed.

Further, in the inventions of claims 6 and 7, even if the low-pressure mercury vapor discharge lamp according to any one of claims 1 to 6 is mounted upside down, the temperature rise of the amalgam is increased. Does not significantly change, and the difference in height between the temperatures is small, and almost the predetermined mercury emission as designed can be achieved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of a low-pressure mercury vapor discharge lamp such as a ring-shaped fluorescent lamp FCL, FIG. 2 is a partial cross-sectional view of an end of the airtight container in FIG. 1, and FIG.

In the figure, 1 is a bulb in which one discharge path made of tubular soda lime glass or lead glass is curved in an annular shape, and 3 is a mount provided at both ends of the glass bulb 1 (both ends are shown). 2 and 3 as they are the same.
Shows only one. ) 2 is a sealing portion that seals the bulb 1 and the stem 4 made of lead glass that constitutes the mount 3, and at the outer peripheral edge of the tip of the sealing portion 2, an annular protruding node portion 21 is formed. An annular recess 22 is formed in the
The bulb 1 and the stem 4 constitute a light-transmitting airtight container.

In the mount 3, a pair of lead wires 5 and 5 are airtightly planted in a pinch seal portion 41 formed by crushing one end of the stem 4, and tungsten is provided between the tips of the lead wires 5 and 5. A coiled electrode 6 formed by winding a filament is connected. Reference numeral 42 is an exhaust pipe made of soda lime glass or lead glass.

On the inner surface of the bulb 1, there is formed a phosphor film 7 coated with a three-wavelength type rare earth phosphor, a continuous-wavelength emission type halophosphate phosphor, or the like. The bulb 1 is filled with mercury Hg and a rare gas such as argon Ar, krypton Kr, and xenon Xe as a discharge medium, either alone or in combination. Reference numeral 8 denotes a mouthpiece which is covered so as to bridge between the sealing portions 2 and 2 at both ends of the valve 1.

As shown in FIGS. 2 and 3, the mercury Hg is, for example, Bi (bismuth about 55% by weight) -Sn (tin about 41% by weight) -Hg (mercury about 4% by weight) in a substantially spherical shape. As the amalgam 9, in the concave portion 22 at the end of the sealing portion 2, as a whole, one discharge path is bent in a virtual plane, and the central axis of the annular valve (H-H and V in FIG. 3) is formed. -V
It is arranged at a position H-H on a virtual plane passing through (intersection point with). V-V is a vertical line passing through the central axis of the valve.

As will be described later, in this ring-shaped fluorescent lamp FCL, a granular amalgam 9 composed of Bi-Sn-Hg is released in the course of heating during the lamp manufacturing process to release some mercury Hg, and then the lamp is turned on. Due to the heat of
Mercury Hg is released from the amalgam 9, and a predetermined light emission characteristic is obtained by supplying this mercury Hg. Further, since the amalgam 9 is in a semi-solid state, it is easy to handle, especially to quantitatively encapsulate.

Then, the above-mentioned ring type fluorescent lamp FC of the present invention.
L is used by being attached to a lighting device, for example, a lighting fixture D shown in FIG. In the figure, D1 is a main body of a lighting fixture, and a lighting device such as a fixture D4 for a building or the like, a power supply connection mechanism, a ballast D2, etc. is housed in the main body D1. Further, a plurality of lamp holders D provided on the outer surface of the main body D1
3 and D3, the fluorescent lamp FCL is supported horizontally (H-H) with the extending direction of the discharge path formed by the bulb 1 as a virtual plane. The fluorescent lamp FCL is supplied with power to the base 8 through the power supply connection mechanism and the power supply line D5 from the ballast D2 and can be stably lit. At this time, the ring-shaped fluorescent lamp FCL
Is projected in an oblique direction from the phantom plane (horizontal) HH direction of the bulb 1 in which the base pins 81, 81 are bent, and the lamp FCL is the projection direction of the base pins 81, 81 is upward or inverted by 180 degrees. It is attached downward to the device D and connected to the socket.

For example, as shown in FIG.
When the ring-shaped fluorescent lamp FCL that is supported with the protruding direction of 81 facing upward is energized, a discharge is generated between the electrodes 6 and 6 (only one is shown), and the amount of mercury evaporated is small immediately after energization, so the luminous flux is low. However, mercury is vaporized and released from the amalgam 9 by the heat of discharge or the heat from the electrode 6, and a predetermined luminous flux is obtained when the amount of mercury becomes a predetermined amount or more.

At this time, the temperature of the bulb 1 supported by the horizontal H-H having the imaginary plane extending in the discharge path is higher on the upper side and lower on the lower side due to discharge heat or convective heat from the electrode 6. The side is low, the temperature difference between the upper side and the lower side is large, and the values on the left and right are intermediate values. That is, the points where the temperature of the valve 1 becomes the highest and the lowest are V in FIG.
The range of U on the upper side of the upper and lower points on the −V line is high, the range of S on the lower side is low, and the range of L on the left side and the range of R on the right side are at the middle of these high and low values.

When the amalgam 9 is arranged above or below the VV line of the vertical axis of the bulb 1, the position of the amalgam 9 is reversed depending on the mounting direction of the lamp FCL and the temperature rise state is the maximum value. Extremely large change to the lowest value. However, in the ring-shaped fluorescent lamp FCL of the present invention, since the amalgam 9 is arranged in the portion extending in the horizontal H-H direction from the central axis of the bulb 1, the temperature rise of the amalgam 9 depends on the mounting direction of the lamp FCL. Does not change.

That is, if the amalgam 9 having the components mixed so as to operate in correspondence with the temperature rise of the lamp FCL is arranged in advance, when the lamp FCL is kept horizontal (H-H) and is turned on. , There is no distinction between the upper surface and the lower surface of the bulb 1 (or in the case of the lamp FCL, the base pins 81, 81
Even if the lamp FCL is mounted upside down (depending on whether the projecting direction is upward or downward), a predetermined light emission characteristic can be exhibited regardless of the mounting direction.

In the lamp FCL, the electrode 6
A nickel ribbon plated with indium is arranged in the vicinity of, and mercury is adsorbed to this indium to form an auxiliary amalgam. At the time of starting the lamp FCL, this auxiliary amalgam receives the heat of the electrode 6 and rapidly releases mercury to start. You may make up for the lack of mercury. This auxiliary amalgam improves the rise of the luminous flux.

Next, a method of manufacturing this ring-shaped fluorescent lamp FCL will be described. First, a phosphor is applied to the inner surface of the straight tube type glass bulb 1 by a conventional method to form a phosphor film 5. Next, the glass stems 4 and 4 provided with electrodes 6 at both ends of the bulb 1 are sealed. During this sealing, while the glass is in a softened state, this portion is put into a mold to pressurize the inside of the bulb 1 to form a ring-shaped protruding node portion 21 at the outer peripheral edge of the tip portion of the sealing portion 2. An annular recess 22 is formed inside. (It is needless to say that the sealing portions 2 are formed at both ends of the valve 1, although not shown.) Then, the sealed valve 1 is heated and softened as a whole to The annular joint portion 21 of the sealing portion 2 is gripped by a jig and wound around a circular drum to form an annular shape. At this time, the inside of the valve 1 is pressurized so as not to be crushed. Then, the exhaust pipe 42 of the stem 4 is heated while heating the entire valve 1.
The inside of the valve 1 is evacuated through the, and then the amalgam 9 made of granular amalgam containing rare gas and mercury Hg is sealed in the valve 1 through the exhaust pipe 42 at one end, and the exhaust pipe 42 is closed.

When this granular amalgam 9 is sealed through the exhaust pipe 42, the amalgam 9 exits from the exhaust pipe 42, rolls in the valve 1 and falls to the gravity lower side, and stops at an intermediate portion in the valve 1. Therefore, when the valve 1 is picked up and inverted so that the sealing portion 2 comes to the lower side, the amalgam 9 stopped at the middle portion moves to the sealing portion 2 at the end of the valve 1 and is placed in the annular recess 22. enter. The amalgam 9 is used for the sealing portion 2 or the ring forming type or the exhaust pipe 42.
On the left side surface of the horizontal line H-H of the bulb 1 shown in FIG. 3 in which the direction in which the bulb 1 is extended is taken as a virtual plane on the glass surface of the bulb 1 and the concave portion 22 which are considerably heated by the sealing of Fix it.

If the amalgam 6 is disposed in the concave portion 22 of the sealing portion 2, the presence of the amalgam 6 is concealed by the mouthpiece 8 after the mouthpiece 8 is attached, which is preferable in appearance, but it is an intermediate portion of the inner surface of the valve 1. In addition, not only the residual heat of the glass bulb 1 is used as the means for adhering, but a slight amount of heating (however, less than the softening temperature of the glass bulb 1) may be added separately.

After this, the sealing portions 2 at both ends of the valve 1,
The base 8 is attached to bridge between the two to complete the ring-shaped fluorescent lamp FCL.

Then, when the relationship between the ambient temperature and the relative illuminance directly under the amalgam 9 was examined, the results shown in the graph of FIG. 5 were obtained. In FIG. 5, the horizontal axis represents the ambient temperature and the vertical axis represents the illuminance directly below, and the amalgam 9 is used as an upper U and a lower S on the VV line of the bulb 1 (the upper U and the lower S are the same lamp 1 upside down). ) And the left H and right H of the horizontal line H-H (the left L and the right R are even if the same lamp 1 is turned upside down). .

As is apparent from FIG. 5, when the amalgam 9 is arranged at the left portion L and the right portion R of the horizontal line H-H of the valve 1, there is no change, but the vertical line V-V of the valve 1. When it is arranged on the upper U or lower S side on the line, the difference between the upper U side temperature and the lower S side temperature is large due to convective heat in the bulb 1, and depending on the mounting direction of the lamp 1, the amalgam 9
It can be seen that the light emission characteristics of the lamp 1 change under the influence of a large temperature.

As described above, according to the results of experiments conducted by the present inventors, even if the amalgam 9 is arranged at the left portion L of the horizontal H-H line portion of the valve 1, it is arranged at the right portion R thereof. Similar characteristics were obtained, but the allowable arrangement position is that when the virtual plane of the valve 1 is horizontal H-H, the angle θ formed by the virtual plane through the central axis of the valve 1 is 40 degrees up and down. Within the range, it is preferable, and within the range of 45 degrees above and below, practically acceptable results were obtained.

FIG. 6 shows another embodiment of the present invention,
In the figure, the same parts as those in FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 6, an amalgam 9 of the same quality as in the above embodiment is fixed to the outer surface of the stem 4 glass constituting the mount 2, and the fixing point is the central axis (H-H, V-V) of the valve 1. If the angle θ formed by the imaginary plane H-H is within the range of 45 degrees above and below,
It was confirmed that the same effect as the above was achieved.

Next, a fluorescent lamp FL having a straight tube type glass bulb 1 according to another embodiment of the present invention will be described with reference to FIG. In the figure, the same parts as those in FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted. FIG. 7A of this embodiment is a perspective view, and FIG. 7B is a partially cutaway sectional view of an end portion.
In this straight tube type lamp FL, a base 8 having a pair of terminal pins 81 arranged in parallel is joined to both ends of a bulb 1 with an adhesive agent. And this lamp FL has a base 8
The two terminal pins 81, 81 are mounted in a socket (not shown) of the instrument for power supply and support.

The external lead wires 5 and 5 led out from the stem 4 at the end of the valve 1 are arranged in parallel so as not to contact each other, and extend in the same direction as the terminal pins 81 and 81 of the base 8. Therefore, the pair of lead wires 5, 5 inside and the terminal pins 81, 81 are parallel in the same direction, and the lamp F
L is attached to a socket (not shown) with the surface of the base 8 including the two terminal pins 81 and 81 as a virtual plane. In the case of such a straight tube type lamp FL, as shown in a partial cross section in FIG. 2 (b), the surface including the two terminal pins 81, 81 is an imaginary plane as in the case of the annular lamp FCL. When this virtual plane is horizontal, it passes through the central axis of the straight tube type glass bulb 1 and the virtual plane H
The amalgam 9 may be provided on the inner surface of the valve 1 or the glass surface of the stem 4 within an angle range of 45 degrees above and below with -H.

In the case of the straight tube type fluorescent lamp FL having this structure,
Even if the lamp FL rotates 180 degrees with the surface of the base 8 including the two terminal pins 81, 81 as the imaginary plane horizontal, the amalgam 9 is arranged at the central axis (H-H, V-) of the bulb 1.
If the angle θ formed by the virtual plane H-H through the intersection (V) is within the range of 45 degrees in the vertical direction, the same effect as that of the above-described embodiment of the ring-shaped fluorescent lamp can be obtained.

The present invention is not limited to the above-mentioned embodiment. For example, the low-pressure mercury vapor discharge lamp is not limited to a fluorescent lamp, and a mercury lamp is enclosed in a glass bulb such as an ultraviolet radiation lamp having no phosphor film. The present invention can also be applied to other lamps, and can be used not only for lighting and ultraviolet radiation but also for office automation equipment.

Further, in the above-mentioned embodiment, a tubular glass tube is bent in a ring shape as a bulb forming the light-transmitting airtight container, but the bulb shape is not limited to this, and a U-shape, a W-shape or the like is used. It may be a so-called compact type isometric shape in which a plurality of straight tube type valves are connected.

Further, the ring-shaped fluorescent lamp of model number FCL and the U-shaped fluorescent lamp of model number FPL defined by JIS (Japanese Industrial Standard) have the caps attached to the upper and lower (front and back) surfaces with the virtual plane as the horizontal direction. Regardless of which direction the amalgam is attached to, the temperature of the amalgam does not change significantly, and a predetermined stable emission characteristic can be obtained.

In the above embodiment, the glass stem is provided as the mount. However, a discharge lamp or a stem in which a metal stem or an end cap is sealed at the open end of the glass bulb to form an airtight container. Of course, the present invention can be applied to a lamp in which a bulb is directly crushed and sealed without using it.

Further, mercury Hg is, of course, required as the form and material of the amalgam, but in addition to the combination of Bi (bismuth) and Sn (tin), In (indium), Pb (lead), etc. were combined. You can use amalgam,
As for the material, the component ratio and mounting location may be appropriately selected according to the type of lamp to be applied, the required characteristics, the ambient temperature and the usage conditions. Further, the number of amalgams enclosed in one lamp is not limited to one, and may be a plurality, that is, within the range of the above-mentioned position.

Further, in the process of completing the present invention,
A straight tube type or U-shaped valve with an inner diameter (BD) of 17 mm or less is used, glass stems are sealed at both ends of this valve, and the stem height from the end of this sealing part to the top of the pinch seal part of the stem ( The ratio (SH / BD) between SH) and the valve inner diameter (BD) is set to 1 or more, and the pipe wall load is set to 100.
A fluorescent lamp for 0A / m ² or more backlight and other OA equipment was manufactured.

With the lamp having such a structure, in the conventional lamp, the distance between the end portion of the sealing portion and the electrode is too close, and the peak of the light output is formed in two or more places. However, this has been solved, and the coldest part is always formed at the tube end, so that the peak of the light output cannot be formed at two or more places, there is no shadow on the exposed surface, and the rising characteristics and Stable light emission characteristics can be obtained without a decrease in light output.

Further, the ratio (LD / BD) of the interval (LD) between the lead wires supporting the coiled filaments, which is the electrode, to the valve inner diameter (BD) is 0.50 to 0.
By setting the number to 60, irregularity of anode vibration can be suppressed and flicker of the lamp can be prevented.

[0053]

According to the first and third aspects of the present invention, when the lamp is turned on, the temperature rise in the horizontal portion of the airtight container is not much different from that in the vertical portion. ) Even if the surface is reversed, the temperature of the amalgam inside does not change much and the amount of mercury released is the same, and since the difference in temperature is also an average part, almost constant mercury can be emitted and it emits light. It has the effect of stabilizing the characteristics.

In the invention of claim 2, the effect of claim 1 is obtained by applying the invention to a ring-shaped lamp. Further, in the inventions of claims 4 and 5, in order to reach the inventions of claims 1 to 3, it is possible to firmly adhere to a portion where the difference in temperature level is small and mercury can be released almost constantly. .

Further, claim 6 and claim 7 of the present invention.
In the invention of claim 1, a low-pressure mercury discharge lamp such as a fluorescent lamp is mounted horizontally in the extending direction of the airtight container, and has the effects described in claims 1 to 5, which is excellent in practical use in light emission characteristics. There is an advantage that a lighting device having the above characteristics can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an annular fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view showing an enlarged main part of the lamp shown in FIG.

FIG. 3 is a cross-sectional view showing an enlarged main part of the lamp shown in FIG.

FIG. 4 is an explanatory diagram showing a lighting fixture (lighting device) according to an embodiment of the present invention.

FIG. 5 is a graph showing the relationship between the ambient temperature and the relative illuminance directly below.

FIG. 6 is a cross-sectional view showing a main part of a fluorescent lamp according to another embodiment of the present invention.

FIG. 7 (a) is a perspective view showing a straight tube type fluorescent lamp according to an embodiment of the present invention, and FIG.

[Explanation of symbols]

 FCL: Ring fluorescent lamp FL: Straight tube fluorescent lamp D: Lighting equipment (lighting device) 1: Glass bulb (translucent airtight container) 2: Sealing part 3: Mount 4: Stem 6: Electrode 9: Amalgam

Claims (7)

[Claims] 1. A translucent airtight container in which a tubular glass bulb is bent or connected, and one discharge path is bent in a virtual plane as a whole; and an electrode provided in this translucent airtight container. A rare gas enclosed in the above-mentioned light-transmitting airtight container; when the virtual plane is horizontal, it passes through the central axis of the tubular glass bulb, and the angle formed with the virtual plane is within the range of a central angle of 45 degrees up and down. A low-pressure mercury vapor discharge lamp, comprising: an amalgam fixed in a translucent airtight container. 2. The low-pressure mercury vapor discharge lamp according to claim 1, wherein the translucent airtight container has an annular glass bulb. 3. A translucent airtight container formed of a straight tube type glass bulb; and a base attached to both ends of a translucent airtight container having two pins which are applied to a straight tube type fluorescent lamp for general lighting. An electrode provided in this translucent airtight container; a rare gas enclosed in the translucent airtight container; a surface containing two pins is a virtual plane, and the virtual plane is horizontal And a low pressure amalgam fixed in a translucent airtight container that passes through the center of the straight tube type glass bulb and forms an angle with the virtual plane within a central angle of 45 degrees above and below. Mercury vapor discharge lamp. 4. The low-pressure mercury vapor discharge lamp according to claim 1, wherein the amalgam is fixed to the inner wall of the airtight container. 5. The low-pressure mercury vapor discharge according to claim 1, wherein the airtight container has a stem glass supporting an electrode, and the amalgam is fixed to the stem glass. lamp. 6. A lighting device main body; and a light-transmitting hermetic container formed by bending one discharge path in a virtual plane as a whole in the main body of the lighting device, and mounted in a direction parallel to the virtual plane. Claim 1, Claim 2, Claim 4 or Claim 5
An illumination device comprising: the low-pressure mercury vapor discharge lamp according to any one of (1) to (6); and a lighting circuit device for the low-pressure mercury vapor discharge lamp. 7. An illuminating device main body; the illuminating device main body having two parallel pins at both ends of a straight tube type translucent airtight container, and a surface including the two or more pins. A low-pressure mercury vapor discharge lamp according to any one of claims 3 to 5, which is mounted on a virtual plane in a direction parallel to the virtual plane; and a lighting circuit device for the low-pressure mercury vapor discharge lamp. Lighting device.