JPS6047360A - Low pressure mercury vapor discharge lamp - Google Patents

Abstract

PURPOSE:To obtain a low pressure mercury vapor discharge lamp scarcely suffering from blackening during a long period of lighting, by adding an activating metal to an alkaline earth metal oxide of an emitter, with which a filament is coated. CONSTITUTION:A coil filament 6 made of molybdenum is coated with a substance, in which a stiffening material 8 and an activating metal 9 are added to an emitter 7 composed of a ternary oxide of barium, strontium and calcium. Said stiffening material 8 is powder of the oxide having a high melting point such as tungsten oxide, zirconia and titanium oxide while having a function of protecting the emitter from an impact of electrons and ions. The activating metal 9 consists of powder of tungsten and zirconium while having a function of gradually reducing barium oxide at high temperature for generating a very small amount of free barium long and continuously. The filament 6 has a coated layer 10 of a composition Ba3MoO6 on its metal surface.

Description

[Detailed description of the invention]

Technical Field of the Invention The present invention relates to a low-pressure mercury vapor discharge lamp sealed with a molybdenum coil filament. [Technical background of the invention and its problems] Low-pressure mercury vapor discharge lamps such as fluorescent lamps are A viewing pole consisting of a tungsten filament and an emitter is sealed at both ends.In such a 111 pole, C is
During operation, the tungsten of the filament becomes hot and acts on the oxide of the emitter, for example Ba1l, and the next reaction produces free barium, which emits electrons. tiB++o + W = Ba3WO6+ 3B+ However, tungsten has an appropriate reducing power and an appropriate nof
Since it acts rapidly and continuously, 1 is required for the production of Ba.
．．・＾There is no shortage and it operates effectively for a long period of time. However, tungsten has very poor workability, and the accompanying annealing process requires a high temperature of 1,500°C or higher.Furthermore, a high-temperature molybdenum mandrel is used for coil forming. It is dissolved and removed. For these reasons, tungsten filaments are not only extremely 1+; b41j but also problematic in terms of resources. In response, it has been considered to construct the filament from molybdenum instead of tungsten. It is true that molybdenum filaments have good workability and can be manufactured using molybdenum iron mandrels, so they can be manufactured at low cost and have fewer problems in terms of resources. However, using molybdenum filaments -Cμ
It was found that the tube end of the discharge lamp quickly became 1iJl (2 points) and was unusable. Juto attributed this to the strong chemical activity of -C and molybdenum, which led to oxidation of 1ζ of 'lk'.
It is thought that the molybdenum progresses excessively and barium etc. are generated due to overcurrent, which causes blackening, and a countermeasure against this problem has been desired. To provide a low-use mercury vapor emission lamp that uses a filament, operates well, and exhibits little blackening even when lit for civilian use. [Required ()・'L of the invention] Filament (2) C by adding 11JK oxide C2 activated metal to the alkali of the deposited emitter
Even if the filament loses its emitter activating ability, the added activated gold 174 performs emission and increases the number by 1. [Embodiment of the Invention] As a result of our research, the present inventors found that the cause of μ-ization was not 1-, Mitter's over-piercing reduction.
Then, in the lamp manufacturing process, the emitter is activated by 7t, which means that alkaline earth gold jt≦carbonate is thermally decomposed and oxidized! There is a process of metamorphosis into 1・'<J, but this activation (
2) The following reaction occurs on the surface of the filament (2), thereby producing a complex compound of the metal of the filament. 3] 1aC+13 +M-+Ba 3M06 +3CO
(M: 1 m of Na gold) However, in a tungsten filament, tung; (because the chemical activity of ten is small, I: la B WO6 formation/) is small, and in operation after the lamp is constructed, it interferes with the reduction of barium oxide. There is no. Molybdenum, on the other hand, has a large i11 B a3 M due to its high chemical activity. The reaction between molybdenum metal and barium oxide is reduced by generating Oo to roughen the metal surface of the filament.
[2] Reduces free barium production. As a result, the emission decreases and the 111 pole voltage is on the negative side (two-in-one, "
The emitter is scattered by ion i4134 and -C
It has been found that this is the cause of prefectural blackening. So, book 1
) In order to reduce barium oxide without relying on the molybdenum metal of the filament, the researchers realized that J-Jl has no problem with emission and eliminates the cracks caused by early blackening, so they used materials such as tungsten in the emitter. Activation money hA
I decided to add . 131, details of the invention will be explained by means of illustrated embodiments. 1χ1 is an example of a fluorescent lamp to which the present invention is applied. In Figure 31, (1) is direct? shaped glass bulb, (
2) The inner cylinder of this bulb (1) is formed with a 2-photoresist coating, f:l). (, () is the stem with both ends of the valve (1) closed, (4
), (4) are from this stem (3) l (3) to the valve (1
) 1. El. 4. (Incoming line, (H-H),
(!5) is the filament electrode between these two input wires (4) and (4); 4
1) Water◇1. ! is ROMed. ”-Delivery, the pole (5) is made of barium strut [6] on a molybdenum
Emine 5 consisting of ternary oxide of lntheum and calcium
I (7) has Ura Qiang (24 (indicated by 0)) (8), (8) and activation money 1. + (indicated by ()) (9), f
9) is added and deposited. These sleeves 5!1!4A (8) are powders of oxides with a high melting point, such as tanges oxide, zirnium oxide, and titanium oxide.
(It has a function to protect the emitter from the bombardment of molecules and ions.) The activated metal (9) is made of powders such as tungsten and zirconium, and is made of powders such as tungsten and zirconia. -4.It has the effect of gradually reducing C2 to generate minute free barium by long Jυth j: straddling 1.. The filament (1;) has B on the surface of the gold Ii.
a3 IV4 +SJ layer (10) with a composition of +106. Now, I will explain how to manufacture this lamp. Fixed Irg
4 (2) Two molybdenum coils for fluorescent lamps/L filanont (wire (1) to the stem (3).-10,000, Valivno...Ternary carbonate of strontium and calcium 4.71 At the end 111' zirconium silicide, powder and the above carbonate powder k・1

[3 car b; % of tungsten gold 1 + j'i powder? Add water 12 and mix this with butyl acetate to make a -C slurry and apply it to the filament (6). Then, attach the fluorescent lamp r=
The carbon salt is partially decomposed into oxides by the heat generated. At this point, due to the action of the residual air and the generated oxidizing gas, a part of the tungsten gold metal is oxidized and reinforced i,,I' (8)
However, a part remains as gold and becomes an activated metal (9). In addition, during this activation process, the surface of the filament (6) becomes 1, which is formed by the reaction of molybdenum and carbonic acid.
3a, a coating layer with a composition of J1o06 (Illi).
11' and 1''.Next, I will not explain the function of this one-light lamp/).S'
When the - lamp is lit, the 'rK pole (5) is heated to high /111a by electrons and electrons /+f[1]. however. The surface of the filament (6) is covered with a layer 110) of a complexed active metal (such as Ba3Mo06), so the effect of processing the oxide is weak. 9) is made of 4'i'4 If with tungsten, so there is almost no coating, and therefore, as with conventional tungsten filaments, the surface of gold 1ijj (9) is gradually reduced at the emisotai' (a trace amount). It generates free barium, and the emission is good (it emits two electrons), and the emission of the electrode is good, and the cathode'7Jq pressure is Therefore, since the ion side method is weak, there is no spatter and there is no risk of early blackening.Next, a 40W fluorescent lamp formed as described above was heated to
]/, ll gold jt4(9) and those with filaments, compared to those with filaments, the present invention's 7., h fruit with one fruit, η1. Ta. The results are shown in the table below. The performance of the active alloy A': 7,1 (added to the transmitter is significantly improved compared to the one without group I'). "NishitI'(=;l-
Same as the tungsten filament lamp of 4: 'Ii na・1] 1 power is obtained,! It's 1. 13. In the present invention, the activated metal may be tungsten, dillium, titanium, hafnium, etc.
reduce the emitter oxide with a suitable Tsuji IW.
'J+'determined;1・lj,j'', 1. The play city jl
All you have to do is generate 1 Tsum, Nida, Attached/1 also has 1 Gold.
The shape and size of 7t5 are not limited to powder, and may be determined by taking into consideration the grain size ν1 and reactivity. In addition to fluorescent lamps, the present invention also applies to germicidal lamps,
It's a way to get rid of NG't'lch results by using M. [1 prefecture of the invention] ΔP, l~Ming's low-pressure water steam discharge j1 Industrial lights are made of molybdenum filanonitrate (nine skin). 7f;: C, the filament surface it+i is split with a molybdenum 6 compound, and the activated metal 11 area becomes effective even when the active effect is lost. The emitter is reduced to emit electrons (therefore, it operates stably over a long period of 1.1 years, and there is no risk of blackening during the 1 period.

[Brief explanation of the drawing]

Figure 1 shows an example of the low-pressure mercury evaporation lamp of the present invention +1
'i! 14j of Example i and FIG. 2 are enlarged cross-sectional views of the main parts. (1) --- Bulb (2) -- Fluorescent limb membrane (5)
・・Filament electric 44 (fil ・-filamen)
F'7+...Emitter (8)...Sleeve kidnapping (9)...
・Kikkatsu Metal Fee: 1 shillin Patent Attorney Inoue - Male 1st Figure 34 lz, tJ Figure 2

Claims (1)

[Claims] It comprises a bulb, a molybdenum coiled filament sealed at the end of the bulb, and an emitter attached to the filament, in which a reducing force of the oxide is applied to an alkaline earth metal oxide in the emitter. A low-pressure mercury vapor discharge lamp characterized by adding an activated metal for emitting electrons.