JPH0613049A - Electrodeless low pressure rare gas fluorescent lamp - Google Patents

Abstract

PURPOSE:To provide an electrodeless low pressure rare gas fluorescent lamp excellent in temperature characteristic with quick build up of luminous flux and satisfactory luminous efficacy. CONSTITUTION:A phosphor 2 is applied to the inner surface of a discharge vessel 1, and a mixed rare gas 3 of xenon less than 50% by capacity ratio and the remainder neon or the mixed rare gas 3 of xenon less than 20 by capacity ratio and the remainder helium is sealed in the inner part of the vessel 1. 4 is an induction coil, and 5 is a high frequency power source. To emit light from the rare gas, a fixed luminous flux can be provided regardless of temperature, and the luminous flux is also quickly built up. The mixed rare gas of xenon less than 50% by capacity ratio and the residual neon or the mixed rare gas of xenon less than 20% by capacity ratio and the residual helium is used as the rare gas, whereby luminous efficiency is more enhanced than in the case of xenon alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless low pressure rare gas fluorescent lamp which has no electrode inside the lamp and discharges and emits a rare gas inside the lamp by a high frequency electromagnetic field from the outside.

[0002]

2. Description of the Related Art In recent years, an electrodeless discharge lamp having a long life and high efficiency has been put into practical use. In this lamp, a high-frequency current is passed through an induction coil arranged in the vicinity of a discharge vessel in which a discharge gas is sealed, and the generated induction electromagnetic field causes the discharge gas in the discharge vessel to discharge and emit light.

FIG. 4 shows an example of this, and an induction coil 4 arranged in the vicinity of a bulb 1 in which a rare gas and mercury are sealed.
The high-frequency current output from the high-frequency power source 5, and
The generated induction electromagnetic field excites mercury atoms in the bulb 1 to emit ultraviolet rays, and the ultraviolet rays are applied to a phosphor (not shown) coated on the inner surface of the bulb 1 to obtain visible light. It is an electrodeless fluorescent lamp.

In FIG. 4, reference numeral 6 denotes a device body made of a conductor, which removes radiation noise generated from a lamp or a high frequency generating circuit. Reference numeral 7 is an electromagnetic shield means composed of a conductive mesh, which transmits the irradiation light from the lamp and prevents noise leakage from the irradiation surface.

Since this electrodeless fluorescent lamp has no electrode inside the bulb 1, there is no fear of electrode breakage and it has a long life. Another feature is that the shape of the lamp can be freely designed.

[0006]

However, since such an electrodeless fluorescent lamp utilizes the emission of mercury,
At low temperatures, the mercury vapor pressure decreases and the luminous flux decreases. There is also a problem that the rising of the luminous flux is poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless low pressure rare gas fluorescent lamp which is excellent in temperature characteristics, has a fast luminous flux rise, and has good luminous efficiency. is there.

[0008]

In order to solve the above-mentioned problems, the present invention is to discharge a rare gas enclosed in a translucent discharge vessel by a high frequency electromagnetic field, and at the same time, a phosphor coated on the inner surface of the discharge vessel. In an electrodeless low-pressure rare gas fluorescent lamp that is converted into visible light by means of a rare gas, the rare gas is a mixed rare gas containing 50% or less by volume of xenon and the balance neon, or 20% or less by volume of xenon and the balance helium. Is a rare gas mixed with.

[0009]

As described above, since the rare gas in the discharge vessel is made to emit light, a constant luminous flux can be obtained regardless of temperature,
Also, the luminous flux rises quickly. Moreover, the rare gas is a mixed rare gas of 50% or less by volume of xenon and the balance neon,
Alternatively, by using a mixed rare gas of 20% or less by volume of xenon and the balance helium, the luminous efficiency becomes better than that of a single xenon.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. In the drawing, reference numeral 1 is a bulb as a discharge container, and a phosphor 2 is applied on the inner surface thereof. In addition, inside the valve 1,
A mixed rare gas 3 of xenon and the balance neon of 50% or less in volume ratio is enclosed. Reference numeral 4 is an induction coil wound around the outer circumference of the valve 1, and 5 is a high frequency power source for supplying a high frequency current to the induction coil 4.

1 generated from the high frequency power source 5 in the induction coil 4 of the electrodeless low pressure rare gas fluorescent lamp constructed as described above.
When a high-frequency current of 3.56 MHz is applied, an electromagnetic field is induced in the bulb 1, the mixed rare gas 3 of xenon and neon in the bulb 1 is discharged, and the resonance wavelength of xenon is 147 nm.
UV rays are generated. Then, this ultraviolet ray is converted into visible light by the phosphor 2.

FIG. 2 is a graph showing the relative luminance when the mixing ratio of xenon and neon is changed, and the relative luminance is 100 when xenon is 100%.

As is clear from this figure, the smaller the mixing ratio of xenon is, the higher the relative luminance is. Especially, when the mixing ratio of xenon is 50% or less, the relative luminance is further increased.

Next, different embodiments of the present invention will be described. The difference from the above-described embodiment is that the mixed rare gas 3 sealed in the valve 1 is 20% or less in volume ratio of xenon and the balance helium, and the other configurations are the same as those of the above-mentioned embodiment, and thus the description thereof is omitted. To do.

Also in this embodiment, similar to the above-mentioned embodiment, the mixed rare gas 3 of xenon and helium in the bulb 1 is discharged, and ultraviolet rays having a resonance wavelength of xenon of 147 nm are generated. Then, this ultraviolet ray is converted into visible light by the phosphor 2.

FIG. 3 is a graph showing the relative luminance when the mixing ratio of xenon and helium was changed. As is clear from this figure, the smaller the mixing ratio of xenon is, the higher the relative luminance is. Particularly, the mixing ratio of xenon is 20% or less, the relative luminance is further increased.

It is needless to say that the present invention is not limited to the above embodiment, and means for applying a high frequency electromagnetic field to the mixed rare gas 3 in the discharge vessel 1 is not limited to the above embodiment. , It can be anything.

[0018]

As described above, according to the present invention, the rare gas to be sealed in the discharge vessel is a mixed rare gas containing xenon at a volume ratio of 50% or less and the balance neon, or xenon at a volume ratio of 20% or less and the balance. By using a rare gas mixed with helium, a constant luminous flux can be obtained irrespective of temperature, a luminous flux rises quickly, and an electrodeless low-pressure rare gas fluorescent lamp with high luminous efficiency can be provided.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of the present invention.

FIG. 2 is a graph showing relative luminance when the mixing ratio of xenon and neon is changed.

FIG. 3 is a graph showing relative luminance when the mixing ratio of xenon and helium was changed.

FIG. 4 is a front view showing a conventional example.

[Explanation of symbols]

 1 Discharge container (bulb) 2 Fluorescent substance 3 Mixed rare gas 4 Induction coil 5 High frequency power supply

Claims (2)

[Claims] 1. An electrodeless low-pressure rare gas fluorescence obtained by discharging a rare gas sealed in a translucent discharge vessel by a high-frequency electromagnetic field and converting it into visible light by a phosphor coated on the inner surface of the discharge vessel. In the lamp, an electrodeless low-pressure rare gas fluorescent lamp in which the rare gas is a mixed rare gas containing 50% or less by volume of xenon and the balance neon. 2. The electrodeless low-pressure rare gas fluorescent lamp according to claim 1, wherein the mixed rare gas is replaced by a volume ratio of 20.
%, An electrodeless low-pressure rare gas fluorescent lamp using a rare gas mixed with xenon of less than 50% and the balance helium.