JPS63202838A - Bactericidal lamp - Google Patents

Abstract

PURPOSE:To obtain a bactericidal lamp with no change in its output of ultraviolet rays even if the ambient temperature is changed by converting luminescent lines of rare gas atoms into ultraviolet rays near 260nm having a bactericidal effect with phosphors. CONSTITUTION:Electrodes 30, 30' are provided on both ends of a discharge container 6 allowing ultraviolet rays near 260nm to permeate. When a discharge is performed across the electrodes 30, 30', luminescent lines of Xe of 147nm and 130nm are emitted by the discharge in the Xe of the low pressure. These luminescent lines of 147nm and 130nm are converted into the wavelength near 260nm with a remarkable bactericidal effect by phosphors 8 provided on the inner face of the container 6. Since the low-pressure discharge characteristic of Xe is not changed by the ambient temperature, ultraviolet rays near 260nm are not reduced regardless of the ambient temperature, i.e., at the low temperature and the high temperature. Accordingly, a bactericidal lamp with no change in its output of ultraviolet rays even if the ambient temperature is changed can be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to germicidal lamps.

[Conventional technology]

Conventionally, germicidal lamps are described on pages 114 and 1 of the Lighting Handbook (Illumination Society of Japan, published by Ohmsha, May 1973).
As stated on page 67.

Low-pressure mercury lamps were used.

[Problem that the invention seeks to solve]

The above-mentioned conventional germicidal lamp utilizes mercury brightness @ 254 nm emitted from a low-pressure mercury lamp, but when the ambient temperature changes, the vapor pressure of mercury changes, causing a significant change in the radiation efficiency at 254 nm. was there. In particular, there was a problem in that the radiation efficiency at 254 nm was significantly reduced at low and high temperatures.

An object of the present invention is to provide a germicidal lamp whose ultraviolet output does not change with changes in ambient temperature and whose efficiency is high even at low and high temperatures.

[Means for solving problems]

The above object is achieved by using at least Xs gas as a discharge gas, generating Xs bright lines of 147 nm and 130 nm, and converting these into ultraviolet light around 260 nm, which has a sterilizing effect, using a phosphor.

Generally, the sterilizing effect of light irradiation is strongest at a wavelength of around 260 nm, so the 254 nm bright line of mercury was suitable for this purpose.

The present inventors focused on low-pressure rare gas discharge whose characteristics hardly change due to changes in ambient temperature, and studied a method of converting the emission line of rare gas atoms to a wavelength around 26 Onm using a phosphor. As a result, we used xe as the noble gas and ZrP zO7? as the phosphor. KI: TQ, BaZ
r51g0e+ La Fs: Ce, La FaP
It has been found that by using materials such as r, LiYF4:Pr, HfPzO7, etc., a germicidal lamp whose output does not change depending on the ambient temperature can be obtained.

Furthermore, when Xe gas is added to a conventional low-pressure mercury lamp, mercury's bright line of 254 nm is strongly emitted at room temperature, resulting in efficient sterilization, while at low temperatures, the vapor pressure of mercury decreases and
4 n, m radiation will be less, but Xe's llfi1
The intensity at 47 nm and 130 nm increases. Therefore, by combining this low-pressure discharge lamp with the above-mentioned phosphor, a sterilizing lamp that does not lose its sterilizing effect even at low temperatures can be obtained.

[Operation] Xs bright lines of 147 nm and 130 nm are emitted by discharge in low pressure Xe. 147nm and 130nm
The emission line of 260 nm has a remarkable bactericidal effect due to the phosphor.
It is converted to a wavelength near nm.

The characteristics of Xe low-pressure discharge do not change depending on the ambient temperature, so regardless of the ambient temperature, 260
Ultraviolet light around nm does not decrease.

Adding Xe gas to a conventional low-pressure mercury lamp, 147n is added to the tube wall.
If a phosphor is provided that converts ultraviolet light around m and 130 nm into ultraviolet light around 260 nm, Xe
Since the emission lines of 147 nm and 130 nm become stronger, the bactericidal effect does not decrease even at low temperatures.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 shows a first embodiment of the present invention, in which electrodes 30.degree. 30' are provided at both ends of a cylindrical discharge vessel 6 made of so-called ultraviolet-transmissive glass that transmits ultraviolet light in the vicinity of 260 nm. The discharge gas is Xe, and its pressure is 0.1 to 10 Torr.
It is about r. On the inner surface of the discharge vessel 6, an Xs bright line 147
phosphor that converts nm and 130 nm to 260 nm,
Here, LaFg:Ce is provided.

When a discharge occurs between the electrodes 3o and 30', Xs bright lines of 147 nm and 130 nm are emitted mainly from the positive column of the discharge, and these are radiated at 260 nm by the phosphor 6 provided on the tube wall.
It is converted to ultraviolet light around m.

Since the above-mentioned discharge does not change depending on the ambient temperature, the above-mentioned germicidal lamp can be used with high efficiency even in a low-temperature atmosphere such as a refrigerator or a refrigerator, or a high-temperature atmosphere such as a dish dryer or a clothes dryer.

In the above examples, the lower the pressure of Xs, the higher the efficiency. However, when the pressure of Xs became less than I Torr, the electrodes were significantly worn out and their lifespan was shortened. Xe
By mixing Xe with at least one of Ar, Ne, and He so that the partial pressure of Xe is low but the total pressure of the rare gas is high, high efficiency and long life can be obtained.

FIG. 2 shows another embodiment of the present invention, in which reference numeral 6 denotes a spherical discharge vessel made of ultraviolet-transmissive glass with a diameter of 4 nm, the inner surface of which is coated with phosphor ZrPzOr 8.

An electrode 30 made of a triple tungsten coil is provided approximately at the center of the spherical discharge vessel 6, and a thermionic emissive material 4 containing (Ba, Sr, Ca) as a main component is coated on the electrode 30. ing.

An electrolytic capacitor 23 and a diode 22 connected as shown in FIG. 3 are housed in a ballast housing case 24 attached to the spherical discharge vessel 6.

The electrolytic capacitor 23 is formed by combining the two capacitors 21 and 21' in Fig. 3 into one cylindrical shape with three terminals, and can be made smaller than two independent capacitors. It has advantages.

Ends of the electrodes, that is, ends 1 and 2 where the thermionic emissive material 4 is applied
The distance between them was 8 m, and ITorrXe was used as the discharge gas.
was enclosed. The electrolytic capacitor 23 has a capacitance of 30 μF.
We used aluminum electrolytic capacitors connected in series as shown in Figure 3.

When the above germicidal lamp was connected to a 50HzlOOV power source, a discharge occurred between the electrode ends 1 and 2 without a starter, and the Xs brightness was 147 nm and 130 nm.
is emitted and converted into ultraviolet light around 260 nm by the phosphor 8.

The above embodiment has one electrode, does not require a starter, and uses a capacitor as a ballast, which is smaller and lighter than an inductance, so it has the feature of being super heavy compared to the first embodiment. are doing.

FIG. 4 shows another embodiment, in which a phosphor LiYFa:Pr 8 is provided on the inner surface of a spherical discharge vessel 6. Two hot cathodes 30.degree. 30' are provided approximately at the center of the discharge vessel 6. The distance between the hot cathodes 30, 30' is such that when one cathode, e.g. 30, acts as a cathode, the other cathode 30', acting as an anode, falls within the negative glow. By doing so, the anode drop voltage is eliminated and high efficiency can be achieved.

The embodiment of FIG. 1 utilizes a positive column of low pressure Xe discharge, while the embodiments of FIGS. 3 and 4 utilize a negative glow. The positive column of low-pressure Xe discharge may be contracted and become unstable, but the negative glow is stable. That is, the germicidal lamps of the embodiments shown in FIGS. 2 and 4 are as follows:
It is characterized by stable discharge.

In a further embodiment of the invention shown in FIG. 5, the inner surface of the discharge vessel 6 made of UV-transparent glass is coated with the phosphor KI:TQ8. Reference numerals 31 and 31' denote cold cathodes, and Xs is sealed as a discharge gas.In this embodiment, since a cold cathode is used, the structure is simple and can be made smaller.

Fig. 6 shows another embodiment of the present invention. In Fig. 6, 6 is a spherical discharge vessel made of ultraviolet-transparent glass, and the inner surface contains phosphors that convert ultraviolet rays of 147 nm and 130 nm into ultraviolet rays of around 260 nm. 8, for example, LaFa:Cs.

An electrode 30 made of a triple tungsten coil is provided approximately at the center of the spherical discharge vessel 6, and the electrode 3o is coated with a thermionic emissive material 4 containing (Ba, Sr, Ca)O as a main component. There is.

40 is an anode, and the distance between the anode 4o and the cathode 30 is set such that the anode 40 enters the negative glow in the steady lighting state. This distance is determined by the main component gas to be sealed.
18 for Xs. It is 17 mm or less for Kr, 13 mm for Ar, 15 mm for Na, and 14 mm for Hs. This eliminates the anode drop voltage and provides high efficiency.

When mercury and Xe were sealed at 0 and 5 Torr and Ne at 6 Torr as discharge gases, sufficient intensity of ultraviolet rays around 260 nm was emitted even at -15°C.

〔Effect of the invention〕

According to the present invention, the output does not change even if the ambient temperature changes;
It is possible to obtain a germicidal lamp that can be used at both low and high temperatures.

[Brief explanation of the drawing]

Figures 1, 2, 4, and 6 are sectional views showing embodiments of the present invention, Figure 3 is a wiring diagram of a condenser ballast used in the germicidal lamp of the present invention, and Figure 5 is a diagram of the present invention. FIG. 1 is an overall view showing an embodiment of the invention. 1.2... Electrode end, 6... Discharge vessel, 8... Fluorescent material, 30.30'... Electrode, 31.31'... Cold cathode, Co1, ζ4゛th 1 Fig. θ Demo 2- Fig. 23 Container calculation 3 diagram

Claims (1)

[Claims] 1. At least Xe as a discharge gas and at least 147
A germicidal lamp characterized in that it is provided with a phosphor that converts ultraviolet rays in the vicinity of 130 nm and 130 nm into ultraviolet rays in the vicinity of 260 nm.