JPS58194246A - Nonelectrode discharge lamp and microwave discharge light source device using lamp thereof - Google Patents

Abstract

PURPOSE:To improve the luminous output of a lamp, by installing a nonelectrode discharge lamp, sealing halogen mercury and rare gases inside its own bulb made up of an ultraviolet transmittible material, in a resonator being field-coupled with a waveguide, while installing another nonelectrode discharge lamp as well at the side of a feeder port. CONSTITUTION:A magnetron 1 generates microwaves which are led into a waveguide 2. A microwave cavity resonator 3 consisting of a lightreflective member 4 and a metallic mesh 5 is field-coupled with waveguide 2. A nonelectrode discharge lamp 7 is formed up by way of sealing halogen mercury and rare gases in its own bulb made up of an ultraviolet transmittible material and disposed inside a cavity 3. Another nonelectrode discharge lamp 8 is formed up by way of sealing halogen mercury and rare gases in its own bulb made up of an ultraviolet transmittible material as well and disposed in position adjacent to a feeder port 6 inside the cavity 3. The internal capacity of the lamp 8 is so designed to be smaller than that of the lamp 7 whereby the lamp 8 is lighted by means of a leaking electromagnetic field out of the feeder port 6 and then the lamp 7 is started to glow subsequently. Afterward, most of the microwave energy is absorbed in the lamp 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric discharge lamp disposed within a waveguide or within a microwave cavity to ensure the starting of an electrodeless discharge lamp disposed within the microwave cavity. The present invention relates to a second electrodeless discharge run 7- to be lit and a microwave discharge light source device equipped with this run 1.

The inventors believe that the electrodeless discharge lamp (hereinafter referred to as the first lamp) disposed in the microwave cavity of the microwave discharge light source device is a microwave electromagnetic lamp in the microwave cavity due to light distribution constraints. They are often placed in locations where the field is weak, and this poses a problem in that starting is uncertain. Therefore, as an improvement measure, a second electrodeless discharge run 1 (hereinafter referred to as the second run) that emits ultraviolet light is installed near the feed port in the waveguide or microwave cavity, where the microwave electromagnetic field is relatively strong. )
, and first turn on the second run 1.

The ultraviolet rays emitted at this time are irradiated onto the first run 1, which serves as the main light source.2. We have separately proposed a microwave discharge light source Ij device in which the first run 1 is reliably started even by a weak microwave leakage electromagnetic field by causing weak ionization in the first rung. However, in this microwave discharge light source device, since the second rung continues to be lit even while the first rung is lit, a portion of the microwave energy is absorbed by the second lamp, and the amount of absorption is large. Then the first
There was a drawback that the optical output during 0 run 1 was reduced.

This issue was made in view of the above points.

In the microwave cavity resonator magnetically coupled to the waveguide, and also on the power supply port side at the shortest distance between the first lamp and the power supply port, halogen, mercury content, and A microwave discharge light source device 1 in which a second lamp filled with rare gas is disposed, the amount of microwave energy absorbed by the second lamp can be substantially eliminated, and the light output of the first lamp can be improved. The purpose is to provide

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

(1) Magnetron that oscillates microwaves, +21t
j A waveguide that guides the microwave, +31tlj A microwave cavity resonator composed of a light reflective member (4) and a metal mesh (5), and the waveguide (
2) and is magnetically coupled. +71! The first rung is made of transparent quartz glass and has a spherical shape with an inner diameter of 30φ, and the inside thereof is filled with 1100H9nH,Q, 5lip of Fe, 2iy of Eg 2.1mm of HgBr2, and 60 torr of argon. (The second rung is made of 81ij transparent quartz glass and has a spherical shape with an inner diameter of 7φ, and is disposed close to the power feeding port (6) in the microwave cavity resonator (3).

Internal KIa t■q) Hg I 2 and 5 torr
Albo 7 II is enclosed. #! Figure 2 is a WR view showing the second lamp (8). In Figure 2, 91 (91) is a lamp support made of the same material as 7I material and integrally formed therewith.

In the microwave discharge light source device having the above configuration,
The second lamp (8) is lit by the leakage electromagnetic field of the microwave from the power supply port (61), and the tenth run 7-(7) is lit by the ultraviolet rays emitted at this time. Most of the wave energy is in the 10th runno (7
), and the emission intensity of the 20th runno (8) decreases. In other words, the amount of energy absorbed by the first lamp (71) is mainly the same as that of the 10th lamp (71) and the second lamp (71).
81 depending on the ratio of the enclosed mercury lid.

It is desirable to reduce the ratio of the amount of mercury enclosed in the second lamp (81) to the amount of mercury enclosed in the first lamp (7).

According to experiments conducted by the inventors, the amount of mercury sealed in the second rung (8) was reduced to 1/2 of the amount of mercury sealed in the first lamp (71).
G or less, the difference in the light output of the first lamp (7) without the second rung (8) and with the second lamp (8; still lit) is 2- or less. It was found that there was no particular problem in practical use.If the amount of mercury enclosed in the second lamp (81) was gradually increased from the above value, the initial output of the first lamp (7) would gradually decrease; 20 rum' (
When the enclosed mercury t of 81 is decreased from the above value, the first
The output of run 1 (919) increases txB, and if the amount of mercury filled in the 20th run (10) is less than 1/Zoo compared to the amount of mercury filled in the first rung (7), the output of the first lamp (71) increases. No difference was observed in the light output from the light output when the second lamp (8I) was left on.

Furthermore, when the amount of mercury enclosed in the second rung (8) is reduced as described above, the amount of ultraviolet radiation from the second lamp (8) is reduced, and therefore the ionization of the first rung (7) is reduced. It is expected that there will be cases where the leakage electromagnetic field from the power supply port (6) is insufficient and the 10th run 1 (7) cannot be lit.

In reality, no such phenomenon was observed. This is because the first rung (7) can be lit reliably, and the amount of ultraviolet rays required for this is extremely small. This is thought to be because the heat generated by the discharge of the enclosed mercury door itself allows it to be lit before it can emit ultraviolet light, which is resistant to evaporation.

As explained above, it is desirable that the amount of mercury sealed in the second lamp (8) be small, but when attempting to weigh a small amount of mercury for work purposes, weighing errors are likely to occur.

Such a weighing error becomes a problem when the 5g2 lamp +81 is made smaller and fc is used, especially when the amount of mercury sealed in the second rung becomes too large due to the above error.
This may cause the rupture of the rank (8I). This is because the first rank (81
The inclusions inside, especially the mercury, were not sufficiently evaporated, and as a result, the 10th lamp (?!
At this time, if the amount of mercury sealed in the second rung (8) is too large, the amount of microwave energy absorbed will be too large, and the run 1 wall will overheat and soften due to the heat generated by its own discharge, causing it to burst. . Such a phenomenon is not simply determined by the amount of water enclosed, but is also determined in relation to the shape and size of the lamp. When the amount of mercury exceeds 3~, run 1, which causes rupture, begins to appear as in the above case. In order to eliminate the above drawbacks.

It is effective to seal the mercury in the second rung (8) in the form of mercury nologenide. This is because mercury halide is solid at room temperature, so it is easy to punch.
And/・In the case of mercury mercury, compared to pure mercury, the amount of water g and violet e contained in the same weight is significantly less, which is also advantageous in increasing the light output of the first lamp (7). .

Furthermore, in a microwave discharge light source device in which the coupling between the waveguide (2) and the microwave resonant cavity (31 is magnetic field coupling), a secondary
If the lamp (81 is inside the microwave cavity) is placed near the power supply port (6), it is also possible to turn off the second run 1 (8+) after the first run 1 (7) lights up. This is the case for magnetically coupled cavity resonator (3).

When the first run 1 (7) lights up and an electromagnetic field mode is formed in the cavity (31), the electric field strength near the power feed port (61) is weak, and the second lamp (81 This is because the discharge cannot be maintained.This tendency is noticeable in #1, where the amount of halogen that is filled at the same time as mercury increases.When the filling is pure mercury, the light emission of the first lamp (7) becomes stronger. Accordingly, the light emission of the second lamp (8) weakens, but does not completely go out.

In this way, turning off the second rank (81) after the first lamp (7) is turned on not only has the effect of not reducing the light output of the first lamp (7), but also has the effect of not reducing the light output of the first lamp (7). It also has a positive effect on the life characteristics of Run 1 (8).
lamp (81 is the 10th lamp (71 is turned on and off) in the shape of a cavity (3), the first lamp (7)
and a120 run 1 (varies depending on the amount of mercury halide sealed in the parent, but in any case the 10th
It must be placed closer to the power supply port (6) @ than the shortest distance between the runno (7) and the power supply port (61). Effective argon is suitable.

The second run 1 (8) is inserted into the microwave cavity 0) as described above.
If the light reflective member (4111) is disposed inside the light reflecting member (4111), its shape will be an obstacle to obtaining appropriate light distribution, so it is preferable to keep the size small.

As explained above, in the present invention, in which the 10th runf is lit by a microwave electromagnetic field, run 1 of ji2, in which halogen mercury and a rare gas are sealed in a bulb made of an ultraviolet transmitting material, is used. By placing it near the feed port of the magnetically coupled microwave whole-body resonator, the microwave energy absorbed by the second lamp can be virtually eliminated, thereby improving the light output of the first lamp. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. FIG. 2 is a sectional view showing run 1' of II2 according to the present invention. In the figure (1 city microwave oscillator, (2) is a waveguide, (3)
is a microwave cavity resonator, (6 city power supply ports, (7) is the first
0 runf, (81 is the second support 1°. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno -

Claims (1)

[Claims] 11) An electrodeless discharge lamp comprising a bulb made of an ultraviolet-transparent material and filled with mercury halogen and a rare gas. 1. The microwave oscillated by the microwave oscillator is supplied to the microwave cavity resonator from the power supply port through the waveguide, and the electrodeless discharge lamp installed inside the microwave cavity resonator is lit. In a second discharge run different from the electrodeless discharge run 1, the waveguide and the resonator are coupled by magnetic field coupling, and halogen mercury and rare gas are sealed in a bulb made of an ultraviolet-transparent material. A microwave discharge light source device in which an electrodeless discharge lamp is disposed closer to the power supply port than the shortest distance connecting the electrodeless discharge lamp and the power supply port, thereby producing f% mold. (3) The microwave discharge light source device according to claim 2, wherein the internal volume of the second electrodeless discharge lamp is smaller than the internal volume of the electrodeless discharge lamp.