JPS58194247A - Microwave discharge light source device - Google Patents

Abstract

PURPOSE:To improve the luminous output of a main light source lamp, by seting the amount of mercury, which is sealed in a second nonelectrode discharge lamp to be disposed inside a microwave cavity together, down to below 1/20 of that to be sealed in another nonelectrode discharge lamp serving as a main light source. CONSTITUTION:A magnetron 1 generates microwaves which are led into a waveguide 2. A microwave cavitied resonator 3 consisting of a light reflective member 4 and a metallic mesh 5 is coupled with the waveguide 2. A nonelectrode discharge lamp 7 being disposed inside a cavity 3 makes up a main light source upon sealing the starting rare gases together with at least mercury. Another nonelectrode discharge lamp 8 is disposed interposingly between the lamp 7 and a feeder port 6 and serves as a starting auxiliary light source after being sealed with said starting rate gases in addition to mercury inside its bulb made up of an ultraviolet transmittible material. The amount of mercury to be sealed in the lamp 8 is set down to below 1/20 of that to be sealed in the lamp 7. Doing like this, the extent of microwave energy to be absorbed in the lamp 8 is thus controlled and thereby the luminous output of the lamp 7 can be materially improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a waveguide for ensuring the starting of an electrodeless discharge lamp disposed within a microwave cavity.

Alternatively, the present invention relates to a second electrodeless discharge lamp disposed in a microwave cavity and lit by microwave energy, and a microwave U-wave discharge light source device including this rung.

The FJi4 parties stated that the electrodeless discharge lamp (hereinafter referred to as the first lamp) installed in the microwave cavity of the microwave discharge light source device does not work well with the microwave inside the microwave cavity due to light distribution constraints. They are often installed in locations with weak electromagnetic fields,
For this reason, there was a problem that starting was uncertain. Therefore, as an improvement measure, a second electrodeless discharge lamp (hereinafter referred to as the second lamp) that is lit near the feed port in the waveguide or microwave cavity, where the microwave electromagnetic field is relatively strong, emits ultraviolet rays. ) and first light the second lamp.

The ultraviolet rays emitted at this time are irradiated onto the first pump, which serves as the main light source, and the first lamp is ionized into a weak electric current, thereby ensuring that the first lamp is activated even by the weak microwave leakage electromagnetic field. We separately proposed a microwave discharge light source device that starts. However, in this microwave discharge light source device, since the second lamp continues to be lit even while the first lamp is lit, a part of the microwave energy is transferred to the second lamp.
The problem is that the light output of the first lamp decreases as the amount of absorption increases.

This invention was made in view of the above points.

In a device in which the first lamp is lit by a microwave electromagnetic field in a microwave cavity, at least a rare gas and 1/20 of the amount of mercury sealed in the first lamp are contained in a pulp made of an ultraviolet-transparent material. A second electrodeless lamp for starting aid containing the following amount of mercury is provided either inside the microwave cavity or inside the waveguide, and the amount of microwave energy absorbed by the second lamp is suppress,
It is an object of the present invention to provide a microwave discharge light source device that can improve the light output of a first lamp.

The present invention will be described in detail below based on examples. I!
Figure 1 shows one embodiment of this invention.

(1) is a magnetron that oscillates microwaves, (21t
i The waveguide (3) that guides the microwave is a microwave cavity composed of a light reflective member (4) and a metal mesh (5), and the waveguide +21 K is passed through the feed port <6). is being paid. (7) is an inner diameter 3 made of transparent quartz glass.
The first lamp has a spherical shape of 0φ, and the inside [is 100119
of HgasM9 of Fe, 289 of HgB of 2,1~
r2, and 60 tOrr of argon. (8) is a second lamp made of transparent quartz glass and has a spherical shape with an inner diameter of 7φ, and is disposed between the first lamp (7) and the power supply port (6) in the microwave cavity (3). The inside is filled with 1~2 Hg gas and 5 Torr of argon. FIG. 2 is a sectional view showing the second lamp (8).

In the figure, (9) is a rung support portion made of the same material as the first lamp (7) and formed integrally therewith.

In the microwave discharge light source device having the above configuration,
The second lamp (8) is lit by the microwave leakage electromagnetic field from the power supply port (6), and the first lamp (7) is lit by the ultraviolet rays emitted at this time. Accordingly, most of the microwave energy #'i first lamp (
7), and the emission intensity of the second lamp (8) decreases. The amount of energy absorbed by the first lamp (7) is mainly determined by the ratio of the amount of mercury enclosed in the first lamp (7) and the second lamp (8).
It is desirable to reduce the ratio of the amount of mercury enclosed in the second lamp (8) to the amount of mercury enclosed in the second lamp (8).

According to experiments conducted by the inventor, Hiromu, when the amount of mercury enclosed in the second lamp (8) is 1/20 or less of the amount of mercury enclosed in the tit lamp (7) when the amount of mercury is enclosed in pure mercury.

The difference in the light output of the first rung (7) when there is no second lamp (8) and when the second lamp (8) remains lit is less than 2% and does not pose any practical problem. I found out what happened. When the enclosed mercury it' of the second lamp (8) is gradually increased from the above value, the light output of the first lamp (7) gradually decreases, and conversely, when the enclosed mercury it' of the second lamp (8) When the amount of mercury is decreased from the above value, the light output of the first lamp (9) increases, and the amount of mercury enclosed in the second lamp is 17,100 compared to the amount of mercury enclosed in the first lamp (7). In the following cases, no difference was observed between the light output of the first lamp (7) and the light output when the first lamp was turned on without the second lamp (8). Furthermore, when the mercury mt-filled in the second lamp (8) is decreased as described above, the amount of ultraviolet radiation from the second lamp (8) decreases, and therefore the ionization of the first lamp (7) decreases. It was expected that the first lamp (7) would not be able to be lit due to insufficient electromagnetic field leakage from the power supply port (6), but such a phenomenon was not actually observed.

This is because the amount of ultraviolet rays required to ensure that the first lamp (7) can be lit is extremely small, so the first lamp (7) is enclosed within the second lamp (8). This is thought to be because the heat generated by the mercury's own discharge allows it to be lit before it completely evaporates and emits strong ultraviolet rays.

As explained above, the mercury i sealed in the second lamp (8)
It is desirable that t be small, but when attempting to use a small amount of mercury kHz due to workmanship, weighing errors are likely to occur.

Such a weighing error becomes a problem when the second lamp (8) is downsized, especially when the amount of mercury sealed in the second pump becomes too large due to the above-mentioned error. ) may cause rupture. This is the first lamp (7
) for several seconds immediately after the lamp is turned on, the contents in the first lamp (8), especially the mercury, are not sufficiently evaporated, and therefore the first lamp (7) cannot absorb enough microwave energy. The second lamp (8) emits relatively strong light. At this time, if the amount of mercury enclosed in the second lamp (8) is too large, the amount of microwave energy absorbed will be too large, and the heat generated by its own discharge will cause The lamp wall becomes overheated and softens, causing it to explode. This phenomenon is not simply determined by the amount of mercury enclosed, but is determined in relation to the shape and size of the lamp. In the case of this embodiment, the amount of mercury enclosed in the second lamp (8) When the amount of mercury exceeds 3M9, some lamps begin to burst as in the above case, and when the amount of mercury filled exceeds 5mm, all lamps explode. It is effective to fill the mercury in the lamp (8) in the form of mercury genide. Since mercury halide is solid at room temperature, it is easy to weigh, and in the case of mercury halide, the amount of mercury contained in the same weight is naturally less than that of pure mercury.This is also the first in this aspect. This is advantageous in increasing the light output of the lamp (7).

In the above embodiment, the second lamp (8) was provided inside the microwave cavity (3), but the lamp (8) was installed at the power feeding port (6) inside the waveguide (6). ), the same effect as in the above embodiment can be achieved.

As explained above, according to the present invention, in a device having a first lamp disposed in a microwave cavity and lit by a microwave electromagnetic field, a first lamp is provided in either the microwave cavity or the waveguide. In addition to providing a second lamp, the amount of mercury sealed in the second lamp was set to 1/20 or less of the amount of mercury sealed in the first lamp, so that the absorption of microwave energy by the second lamp was reduced. This has the effect of improving the light output of the first lamp.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a microwave discharge light source device showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a second lamp according to the present invention. In the figure, (1> is a microwave oscillator, (2) is a waveguide, and (3) is a microwave oscillator.
) is a microwave cavity resonator, (6) is a power supply port, (7) is a first lamp, and (8) is a second lamp. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] (11) A microwave oscillator, a waveguide that guides the microwaves oscillated by this microwave oscillator, a microwave cavity coupled to this waveguide through a feeding port, and within this microwave cavity. a first electrodeless discharge lamp serving as a main light source, which is disposed inside the waveguide or inside the microwave cavity, and which is filled with at least mercury together with a starting rare gas; A second electrodeless discharge rung for assisting starting is provided, in which mercury is sealed in addition to at least a rare gas for starting in a bulb formed of an ultraviolet-transparent material. The mercury value is the mercury sealed in the polar discharge lamp.
1. A microwave discharge light source device characterized by having a discharge voltage of /20 or less. (2) The microwave discharge light source device according to claim (1), characterized in that the mercury of the second electrodeless discharge lamp is sealed in the form of mercury halide.