JPS6280959A - Metallic vapor discharge lamp - Google Patents

Abstract

PURPOSE:To obtain a metallic vapor discharge lamp in which output of ultraviolet rays can be maintained for long hours, by making metallic magnesium or magnesium halogenide to be contained in an atomic gram number ratio 1/40-2/3 of magnesium to iron so that a thin film cannot be formed by iron attaching to an inner wall of a luminous tube. CONSTITUTION:Metallic magnesium or magnesium halogenide is made to be contained in an atomic gram number ratio 1/40-2/3 of magnesium to iron so that a thin film cannot be formed by iron attaching to an inner wall of a luminous tube. Addition of magnesium nearly has no effect on electrical characteristics such as starting voltage and restriking voltage. Metallic iron and metallic magnesium can be added in shapes of respectively iron halogenide and magnesium halogenide, and beside, the same effect is obtained by mixing both. Thus, output of ultraviolet rays having wavelength area of 280-400nm can be prevented from decreasing even when the layers are lighted for long hours.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metal vapor discharge lamp used for photochemical reactions, curing of paints and inks, and the like.

[Prior art and its problems]

Ultraviolet rays are often used to cause photochemical reactions and to cure paints, inks, etc., and ultraviolet rays with a wavelength range of about 280 to 400 nm are effective for these purposes.

Conventionally, high-pressure mercury lamps have been used as a source of ultraviolet rays, but the light emitted from high-pressure mercury lamps consists of many bright line spectra, and each spectrum is dispersed over a fairly wide fff range. There is a problem in terms of efficiency when using a mercury lamp for photochemical reactions that have an effective wavelength range or for curing of the four types. For this reason, metal vapor discharge lamps are often used in which a metal halide is sealed as a luminescent material in the source of a high-pressure mercury lamp to increase the amount of light emitted in the effective wavelength range. In particular, metal vapor discharge lamps filled with iron are
Since it continuously emits light in the wavelength range of 350 to 400 nm, it is convenient for purposes such as photochemical reactions and curing of paints.

However, when a metal vapor discharge lamp filled with iron is left on for a long time, iron adheres to the inner wall of the fluorescent tube and forms a thin film. For this reason, the number of iron bonds that contribute to light emission decreases, and the formed i4BIM blocks the transmission of ultraviolet rays.
There is a problem that the output of ultraviolet rays decreases.

In order to improve this problem, it has been reported that a metal vapor discharge lamp filled with iron is further filled with lead 'kt% 710. (Utility Model Publication No. 54-15503) However, if lead is added, the original purpose of preventing the formation of a thin iron film and maintaining the output of ultraviolet rays can be achieved, but at the same time, 1 lead can prevent the formation of mercury. 302゜313, 365n
Because the output of the j1 line, which has a large m, is extremely weakened, it is not commonly used for purposes such as photochemical reactions and curing of paint.

It is also known to add primary tin, but like lead, this also has the problem of significantly lowering the output of the bright line spectrum of mercury.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a metal vapor discharge lamp that prevents iron from adhering to the inner wall of the arc tube and maintains ultraviolet output for a long time without adversely affecting the emission spectrum of mercury and iron. It is something.

[Structure of the invention]

The polarization of the present invention is based on a metal vapor lamp in which an appropriate amount of iron and halogen is sealed in an arc tube with one pole, along with enough mercury and rare gas to maintain arc emission. , metallic magnesium or magnesium halide, the gram atomic ratio of magnesium to iron is 1/1.
It is characterized in that it is sealed so that the amount of iron is 40 to 2/3 to prevent iron from adhering to the inner wall of the arc tube and forming a thin film.

That is, in order to achieve the above-mentioned object, the inventor discovered that the halide of magnesium was M-yo,
The present invention was completed after extensive experiments.

The amount of magnesium added is within the above range, but the amount added to iron is l/40 in terms of gram atomic ratio.
In the case below, the UV output is not sufficient, and conversely, 2
If it exceeds /3, a problem occurs in which the emission spectrum due to iron (iron) becomes slightly weaker.

[Example of 夷1Jtun] Below, the non-inventive embodiment will be basically celebrated based on the drawings.

Figure 1 shows a 4K rating used as a light source for photochemical reactions.
The lamp is shown as a metal evaporation lamp of W, but a pair of tubes 2゜2 are arranged in the same manner in an arc tube 1 made of quartz with an inner diameter of 22 mm, and the distance between the electrodes is 250 m.

Both ends of the light emitting lamp are seal parts 11, and the seal parts 11
A molybdenum W 33 is sealed in the molybdenum W 33, and the outer 4 wire 4 and the tun 2 are electrically connected via the molybdenum tube 3. Luminescence/ftl contains 120~ metallic mercury, 13 mq of mercury iodide, 5 capes of iron, 0.2~ of magnesium and 15 g
It is filled with 1 g of argon gas. The amount of filler contained in this mag screw 9mm is 74 grams atomic ratio to that of iron.
It is.

When the lamp was turned on, the lamp current was 12.3A and the lamp voltage was 362cm when the lamp power was 4KW. Although the lamp was lit until time too long, no iron adhered to the inner wall of the arc tube 1, and no thin film of iron was formed. At this time, we determined the change in the output of ultraviolet rays in the wavelength range of 280 to 400 nm, but as shown by A in Figure 2, the output maintenance rate was 9 after 1000 hours.
It was 0%.

Incidentally, when a metal vapor discharge lamp similar to that used in this example but without the addition of magnesium was lit for comparison, iron began to adhere to the inner wall of the light emitting tube after several tens of hours, and a thin film formed. was formed. As a result, the output maintenance rate decreased to 50% after 1000 hours, as shown by characteristic curve B in FIG.

Next, 1 of mercury due to the addition and encapsulation of magnesium.
We investigated the influence on the output of the four-line spectrum and the output of the iron spectrum, and found that the mercury spectral output of the steam discharge lamp of this example was reduced by 3 degrees compared to the one without the addition of magnesium. , the spectral power of iron decreased by 5 inches, and the decrease was small. On the other hand, when lead and tin were added and encapsulated instead of magnesium in this example, the spectral output of mercury was reduced by 35 coefficients when lead was added, and by 28 coefficients when saturated with tin. It was confirmed that there was almost no adverse effect on the spectrum output.

There is almost no effect on electrical characteristics such as starting voltage and restriking voltage due to the addition of magnesium.

In this example, metallic iron and gold rice magnesium were added, but they may be added as iron halide or magnesium halide, or a mixture of both may be added to obtain the same effect.

〔Effect of the invention〕

As explained above, in the present invention, magnesium is added to a gold-striped steam emission 'fIL lamp filled with iron so that the gram-atom cutting ratio of iron is 1/40 to 2/3. Therefore, the added magnesium has almost no negative effect on the emission spectrum output of water and iron, and the special characteristics of mercury and iron.
You can use that skill. In addition, since iron is completely prevented from adhering to the inner wall of the arc tube and no cracks are formed, the output of ultraviolet rays with a wavelength range of 280 to 400 nm does not decrease even when the lamp is turned on for a long time. Therefore, it is possible to make a metal vapor discharge lamp suitable as an ultraviolet source for causing photochemical reactions and curing paints, inks, and the like.

[Brief explanation of drawings]

FIG. 1 is a TlIr curve diagram of the Kinsei steam vent lamp, and FIG. 2 is a diagram illustrating the characteristics of the output maintenance rate. 1... Arc tube 2...' polarization 3... Molybdenum foil 4... Outer conductor #J 11... Junto from the seal section Kusio wo Bond Co., Ltd.

Claims (1)

[Claims] In a metal vapor discharge lamp in which an appropriate amount of iron and halogen is sealed inside an arc tube equipped with electrodes, along with sufficient amounts of mercury and rare gas to maintain an arc discharge, magnesium metal or magnesium halide is added to the iron. 1. A metal vapor discharge lamp characterized in that magnesium is sealed in a gram atomic ratio of 1/40 to 2/3 to prevent iron from adhering to the inner wall of an arc tube and forming a thin film.