JPS59215653A - Low pressure mercury-vapor discharge lamp - Google Patents

Abstract

PURPOSE:To check an amalgam effect resting on a burning position to the utmost as well as to make performance characteristics maintainable in optimum conditions, by housing amalgam or a metallic body for amalgam forming use shiftable inside a tubule being open to the inside of a light emitting tube valve in an axial direction. CONSTITUTION:A tubule 19 more extendedly existing inside a discharge space 18 longer than a filament 16 and simultaneously ranging this discharge space 18 is installed in a stem 14 of a mount 13, while a metallic body 21 for amalgam forming use is shiftably housed inside this tubule 19 and an exhaust tube 17 being part of this tubule 19 in an axial direction. With this constitution, in the metallic body 21, its burning position becomes situated in the lowest part of the tubule 19 in all cases. And, the lowest part of the tubule 19 is a spot capable of keeping relatively low temperature in the discharge space 18 in relation to a heat convection so that unevenness in temperature attributable to the burning position is little as much as negligible, and since a temperature differential around the metallic body 21 will get off with a small one, mercury vapor pressure inside a fluorescent lamp can be controlled to a proper value, thus a constant light output can be secured all the time in any case regardless of the burning position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a low-pressure mercury vapor discharge lamp, typified by a fluorescent lamp.

[Hatsutsu] technical background and its problems]

In general, fluorescent 2 lamps are set so that the efficiency of converting supplied power into ultraviolet light is highest when the tube wall temperature is around 40°C and the mercury vapor pressure is approximately 6 × I OimHg. When the lamp ambient temperature is about 20~25°
It becomes. However, when the Mll humidity temperature significantly exceeds this value, the conversion efficiency of ultraviolet rays deteriorates rapidly, causing problems such as a decrease in light output.

By the way, the Kanai Hikari Lung, which has been curved into a saddle shape in recent years, is housed in a ball bulb-shaped envelope with 7 bases, along with a ballast and lighting fixture, and can be used by simply attaching it to an existing incandescent light bulb socket. The present applicant has put into practical use a lighting device that enables this, and it is becoming widely popular as a light source that saves power and light. In such devices, the fluorescent lamp is surrounded by an envelope, so if the envelope is sealed and the lamp is turned on, the fluorescent lamp will be heated by the heat emitted from the light rung itself and the ballast. The ambient temperature exceeds 60°C, and as a result, the mercury vapor pressure exceeds an appropriate value, causing problems such as a decrease in ultraviolet conversion efficiency.

Therefore, the mercury vapor pressure of Kanai Hikari Lang was adjusted to the appropriate value.
As a means for controlling lJ, it is known to insert a metal body such as indium, which combines with excess mercury to form an amalgam, into the second ring.

This metal body is the best at capturing mercury among fluorescent lamps! It is desirable to install it in a place where the temperature is A1z, that is, in a low temperature area where mercury is likely to condense.

In general straight tube or annular shaped light lamps, it is often fixed to the legs of the stem or the tube wall of the light lamp.

However, lighting device a with the above configuration is sometimes installed in a ceiling light fixture with the base facing upward, or in a stand type fixture with the base facing downward, so the lighting direction may vary depending on the usage pattern. Therefore, depending on the lighting direction, problems may occur such as the amalgam effect not being fully exhibited. In other words, for example, if a metal body is fixed to the stem and the temperature of the stem is set to the most desirable temperature for the amalgam effect when the lamp is lit with one cap facing upward, then when the stem is lit with the cap facing downward, Because the temperature of the stem is lower than the above-mentioned appropriate temperature due to thermal convection, a temperature difference occurs,
For this reason, the ambient temperature of the metal body fluctuates depending on the lighting direction, causing a problem that the effect of the amalgam fluctuates.

As a countermeasure to this problem, it is conceivable that the metal body for forming the amalgam is not fixed to the stem or the like, but is housed in the two rings so that it can move freely. In this way, the metal body moves to the bottom of the lamp regardless of the lighting direction of the device, and this bottom part is always kept at a low temperature due to heat convection, so variations in the metal body temperature are suppressed. become.

However, according to this configuration, since the metal body directly contacts the phosphor coating on the inner surface of the second ring, there is a risk that the phosphor coating may partially 4Rfllp or deteriorate due to this contact, which may affect the working characteristics of the lamp. There is a risk of adverse effects.

The above drawbacks also occur when amalgam itself is inserted instead of a metal body that combines with mercury to form an amalgam.

[Purpose of the invention]

The present invention was made based on these circumstances, and
We minimize the dependence of the amalgam effect on the lighting direction,
Furthermore, the object of the present invention is to provide a low-pressure mercury vapor discharge lamp that can maintain good working characteristics without the amalgam or metal body coming into contact with the phosphor coating.

[Summary of the invention]

That is, in order to achieve the above object, the present invention has a stem of a mount sealed to an end of an arc tube bulb, one end of which extends further into the arc tube bulb than the electrode thereof, and the other end of which extends further into the arc tube bulb. is located closer to the end of the emitted V pulp than the electrode, and a narrow opening is provided in the arc tube pulp, and the amalgam or the metal body for forming the amalgam can be moved in the tube axis direction within this thin tube. It is characterized by being accommodated.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment shown in the drawings.
Ru.

In the figure, reference numeral 1 denotes an envelope approximating a ball-shaped incandescent light bulb. Inside the outer envelope KIF1, which is constituted by a spherical glue lobe 4, there is a curved tube-shaped light beam 2/p5, a lighting tube 6 as the first ω1 element of this glow light rung 5, and A choke coil type ballast 7 as a 1L stabilizing element is integrally housed. The luminescent tube pulp 8 of this fluorescent lamp 5 is as follows.

A straight tube-shaped glass bulb is bent into a substantially U-shape at the center between the 70 and 9.9° parts to form a first bent part 10', and the first bent part 10 and both ends are bent. A pair of second curved parts 11 and 11 are formed by bending the space between the parts 9 and 9 into a substantially U-shape in a direction substantially perpendicular to the plane coloring the U-shape, and bending these two times. The both end portions 9.9 and the first curved portion 0 are brought into instant contact with each other and positioned in the same direction, and because its overall shape resembles a saddle for horseback riding, it is called a saddle-shaped valve. It is called. A phosphor coating 12 is coated on the inner surface of the arc tube bulb 8 over the entire length, and both ends 9
, 9 are sealed with mounts 13, 13, respectively.

Mount 13.13 is attached to stem no. 4 as shown in Figure 3.
The internal lead wire 15 sealed in this stem 14
．． A filament 16 as an electrode is installed between 15 and 15.
I'm still on IM. Also, the stem 14 has a filament 16
An exhaust pipe 17 is provided extending in the opposite direction, and mercury and an inert gas as a town ionization medium are filled into the arc tube bulb 8 through the exhaust pipe 17.

The fluorescent light 2 ring 5 is housed in an envelope l with both end portions 9.9 and the first curved portion 10 facing the cap 2 side, and the ballast 7 and the lighting It is also electrically connected to the base 2 via a tube 6.

The exhaust pipe 17 of one of the mounts 13 has its base end extended in a straight line toward the discharge space 18 in the arc tube bulb 8 to form a thin tube 19, and the tip of this thin tube 19 is is the discharge space 1 than the filament 16
8 and is close to the one second curved portion iz. A through hole 2o that opens into the discharge space 18 is provided at the tip of the thin tube 19, and the inside of the thin tube 19 and the exhaust pipe 17, which are in communication with each other, are communicated with the discharge space 18 through the through hole 20. Therefore, the exhaust pipe 17 is the narrow pipe 1
It forms part of 9. A metal body 21 that forms an amalgam by combining with mercury in the arc tube pulp 8 is housed in the thin tube 19. This metal body 21 is made of indium (In), bismuth (
Bj), tin (8n), lead (Pb), mercury (Hg
) and an alloy made by appropriately mixing these various metals are preferred, and as a preferred example, such a metal pellet 21 is formed in the shape of a substantially spherical pellet having a diameter larger than the through hole 2o. Then, the metal body 21 is introduced through the exhaust pipe 17 immediately after the mercury and inert scum are sealed in the arc tube bulb 8, in other words, immediately before the exhaust pipe 17 is sealed off.
As shown by the arrow in FIG. 3, it is accommodated in the thin tube 19 so as to be freely movable in the tube axis direction. therefore,
As shown in FIG. 1, when the cap 2 is turned upward and lit vertically, the second curved portion 11° 11 of the fluorescent lamp 5
is located at the bottom, the metal body 21 moves within the thin tube 19 due to gravity and forms the second curved portion J I , f J
1111j is located in the through hole 20 part, and conversely the cap 2
When the lamp is turned downward and lit vertically, the Kanai Nine Lamp 5
Since both end portions 9, 9 are directed downward, the metal body 21 is located at the side toe of the exhaust pipe ln for the same reason as described above. When the cap 2 is directed upward, the heat emitted from the fluorescent lamp 5 and the ballast 7 is directed towards the cap 2 due to thermal convection, so the area around the second bending section 11 and 11 of the fluorescent lamp 5 and ballast 7 is It is kept at a relatively low temperature, and on the other hand, when the base 2 is directed downward, the above heat is directed toward the top side of the globe 4, so the first curved part 0 and both ends = b9+9 are kept at a relatively low temperature. Therefore, regardless of the lighting direction, the metal body 2 is located at a low temperature portion in the discharge space Z8.

As shown in FIG. 1, the thin tube 19 is inclined at a certain angle with respect to the center line 0□-〇 of the envelope I passing through the cap 2. Even when the light is turned on horizontally, the metal body 21 moves to the sealed end of the exhaust gas vr7 forming a part of the thin tube 19 or to the through hole 20 portion of the thin tube 19.

According to such a configuration, the stem 14 of the mount 13 is provided with a thin tube 19 that extends further into the discharge space 18 than the filament 16 and is connected to the discharge space 18, and this thin tube 19 and a part of the thin tube 19 A metal body 21 for amalgam formation is placed inside a certain exhaust pipe lz! Since the metal body 21 is accommodated so that it can be moved in any direction, the metal body 21 will be located at the lowest part of the thin tube 19 regardless of the lighting direction of the device. In this case, the bottom part of the thin tube 19 is machined,
Because it is a place that is kept at a relatively low temperature among the discharge walls 18 due to heat flow, there is little variation in temperature due to the lighting direction, and there is also a small difference in convergence around the metal body 21. Therefore, the mercury vapor pressure in the light shifter 5 can be kept at an appropriate value at all times, and a constant light output can be produced in the i6 regardless of the lighting direction.

Moreover, since the metal body 2) is accommodated in the narrow Qr9, this metal 1/1=zt does not directly touch the phosphor coating 12, and therefore the phosphor coating 12 is depleted. It has the advantage of being able to prevent soil damage and deterioration, and maintain good soil properties.

It should be noted that the low-pressure mercury vapor discharge lamp according to the present invention is not limited to being housed in an envelope as in the above-mentioned embodiments, but is limited to the general i)! The same method can be used for lamps that are exposed to the outside and lit, such as 4-shaped or curved tube-shaped lamps.Furthermore, thin tubes are not limited to those that are used in front of the exhaust. The tubular body may be melted into the stem.

Furthermore, an amalgam may be used instead of a metal body that combines with mercury to form an amalgam.

〔Effect of the invention〕

According to the present invention described in detail above, one end of the stem of the mount extends further into the arc tube bulb than the electrode, and the other end is located on the arc tube pulp end side, and the stem extends into the arc tube bulb. A thin tube that opens is provided, and the amalgam or a metal body for forming the amalgam is accommodated in this thin tube so that it can be moved in the direction of the tube axis. Therefore, regardless of the lighting direction, the metal body is relatively low temperature among the arc tube pulps. Because the temperature difference between the amalcam and the metal body is small, the mercury vapor pressure can be controlled to an appropriate value, and fluctuations in light output can be suppressed.

In addition, since the amalgam or metal body does not come into direct contact with the phosphor coating, there is an advantage that damage or deterioration of the phosphor coating can be prevented and good performance characteristics can be maintained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of the entire device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a sectional view of the mount sealing part. be. 8... Arc tube bulb, 12... Fluorescent coating, 13
...Mount, 16...Electrode (filament), 1
9... Thin tube, 21... Metal body. Applicant's representative Benfutsushi Takeshi Suzue 2 spears 3 figures I No. 1 and 1 figure II ``r 1 0゜■-'' spears 2 figures

Claims (1)

[Claims] A luminescent pulp with electrode mounts sealed at both ends is placed, a luminescent material is deposited on the inner surface of the arc tube pulp, and an inert gas and mercury are injected into the arc tube pulp. In a low-pressure mercury vapor discharge lamp containing a raw ionizing medium, the stem of the mount has one end extending further into the arc tube pulp than the electrode and the other end extending further into the arc tube pulp than the electrode. A thin tube located on the end side and opening into the pulp of the arc tube is provided, and a metal body that forms an amalgam by combining with amalgam or mercury is housed in the thin tube so as to move circularly in the tube axis direction. A low-pressure mercury vapor discharge lamp characterized in that the amalgam or metal body is located at the lowest part of the thin tube depending on the lighting direction of the arc tube pulp.