JPS585960A - Microwave discharging light-source device - Google Patents

Abstract

PURPOSE:To increase the lamp starting performance of a microwave discharging light-source device, which lights a non-electrode lamp through microwaves, by covering a starting auxiliary antenna made of metal with a coating body made of a heat-resisting dielectric, with a space provided between them, in manufacturing the said device. CONSTITUTION:A starting auxiliary antenna 132 made of tantalum wire is covered with a coating body 142 made of quartz glass, with a space provided between the antenna 132 and the body 142, so as to make a starting auxiliary body. Thus made starting auxiliary body is installed in a spherical lamp 6b made of transparent quartz glass. During the discharge, the antenna 132 and the body 142 are heated, and difference arises between the expansion degrees of the antenna 132 and the body 142 due to the difference between their thermal expansion coefficients. However, the above difference of the expansion degree is absorbed by the phenomenon that the antenna 132 curves in the space formed between the antenna 132 and the body 142. Since the space formed between the antenna 132 and the body 142 is made vacuum, any electric discharge doesn't develop between them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave discharge light source device using microwave discharge, and in particular to an electrodeless lamp disposed within the microwave cavity of the device in order to improve the startability of the device. This invention relates to improvements to the starting auxiliary antenna for

Fig. 1 shows a conventional microwave discharge light source device. In Fig. 1, a microwave oscillator is a magnetron that oscillates a microphone.

(2) Ha! Dunnetron antenna, (3) is magnetro/
A waveguide that guides the microwave oscillated from the ill, (41
is a bowl-shaped reflecting plate with an opening on one side made of a material that reflects both microwaves and light; (51 is the reflecting plate (4) and the waveguide (3)
Inside the microwave cavity provided at the junction of.

(6) is a quartz electrodeless discharge lamp formed into a single sphere with mercury as a discharge luminescent material and argon as a starting rare gas sealed inside; A pair of supporting projections.

(71 is a fan for cooling the magnetron (11) and discharge lamp (6), (81 is a vent provided in a part of the waveguide (3), (9) is an i-tanetron+11 and a vent (8). ), and aI is a metal mesh plate that covers the front opening of the reflector plate (41), and substantially transmits light.

Microwaves are reflected, and the above-mentioned reflecting surface (41) constitutes a microwave cavity resonator tall.

aυ is a magnetron (!), a waveguide (3), a reflecting surface (4
), the box body U fits into the support protrusion (l#&) formed with the discharge lamp (6)k at one end, and the other end fits into the supporting protrusion (l# &) formed with the discharge lamp (6)
) is a support member made of a low-loss dielectric material such as quartz glass that supports the discharge lamp (6).

In the microwave discharge light source device constructed in this way, when power is applied to the magnetron (11).

The microwaves generated by the magnetron (ll&c) are guided into the cavity resonator υ via the magnetron antenna (2), waveguide (3), and feed port (5), creating a microwave electromagnetic field inside. This microwave electromagnetic field causes a lamp (61 to discharge), and the light emitted by this discharge is reflected directly or by a reflective surface, passes through the metal mesh, and is radiated to the outside. .

After cooling the magnetron (11), the cooling air from the fan (7) is transferred to the air pipe (9), 2 ventilation ports (8), 6 waveguides (3),
After the lamp (61) is cooled through the power supply port (5), it is discharged to the outside through a metal mesh board.

However, in a device having such a configuration and operating principle, the lamp! Microwave impedance differs before and after lighting, but in order to effectively use microwave input as discharge energy, it is necessary to match the impedance of 6 microwave cavities 1M power when lighting the lamp), and when the lamp malfunctions, the microwave impedance The ff1114 force will be in a state of impedance mismatch. Therefore, when the lamp is not lit, the microwave energy emitted from the magnetron (11) is transferred to the power supply port (
Most of the microwave electromagnetic field is reflected at the portion 51, and the microwave electromagnetic field formed in the microwave cavity @2 is only a weak electromagnetic field that slightly leaks into the microwave cavity from the feed port (5). Then, in order for the lamp (61 to start discharging,
Since this weak electromagnetic field has to be used to cause edge destruction within the lamp, a problem has arisen in that the starting of the lamp becomes extremely uncertain.

During this time, the inventor, Hiromu, went ahead to solve the electrical point problem.

A lamp with a starting auxiliary antenna as shown in FIGS. 2 and 3 was proposed. In other words, the one in Figure 2 consists of a starting auxiliary antenna (to) made of a thin metal rod and a heat-resistant induction material such as quartz to protect the starting auxiliary antenna (to) from the heat of the discharge gun when the lamp is lit. The one in Fig. 3 has a starting auxiliary antenna (txt) that is built into the discharge lamp (61) and a covering body with a starting auxiliary antenna (txt) protruding from the outer wall of the lamp (6). This covering body (141) generates a discharge between the tip of the starting auxiliary antenna (1St) on the side not in contact with the lamp (61) and the internal space of the microwave cavity. It has the role of preventing the occurrence of

In the lamp (6) having the starting auxiliary antenna configured as described above, the microwave electromagnetic field leaking into the microwave cavity before lighting the lamp is transmitted to the starting auxiliary antenna a1 or (ISl
) Concentrated at the tip, starting auxiliary antenna 0 or (1S1)
An extremely strong microwave electromagnetic field is formed at the tip, and this electromagnetic field causes dielectric breakdown in the space inside the lamp (6), and the lamp (61) starts discharging.Therefore, the lamp (6) having the above structure is provided. The reliability of starting the microwave discharge light plow device is extremely high.

However, in the lamp with the above configuration (6), the starting auxiliary antenna Q36 or (131) made of a metal rod and the covering am or (14) made of a heat-resistant induction material made of quartz
1) Due to the difference in thermal expansion coefficient between the lamp (61) and the lamp (61), the heat generated when the lamp (61) is turned on may damage the covering aa and damage the starting Kamisuke antenna. In addition, the starting auxiliary antenna (1
If S1) is installed outside the lamp, the starter antenna (1st) will be exposed to the air.

There was a drawback that discharge occurred between the tip of the starting auxiliary antenna (13t) on the side not in contact with the lamp and the internal space of the microwave cavity, causing the starting auxiliary antenna (131) to melt.

Hi's @aki was made in view of the above drawbacks, and Tosho, an electrodeless discharge lamp is placed inside the microwave cavity, and a microphone a
@In the microphone four-wave discharge jt source system that lights up the lamp, the starting auxiliary antenna is connected through the air gap. The purpose is to extend the life of the child.

An embodiment of the present invention will be described below based on Figure #L4. Il is the outer wall of a spherical lamp made of transparent quartz glass and has an inner diameter So; (6a))'! , lamp outer wall (6b)
(132) is a lamp support projection with a diameter Nws and a total length of 1 g 1 m, which is integrally formed with a diameter of 0. A starting auxiliary antenna made of tantalum wire with a total length of 20cm.

(142) is a covering made of quartz glass that covers the starting auxiliary antenna (132) with a gap between it and the starting auxiliary antenna (152), and constitutes the starting auxiliary body together with the starting auxiliary antenna (1st). Well, the gap is a vacuum.

Like this! The electrodeless lamp (61 using the device shown in Fig. 1, microwave cavity 1 it) was placed in P3 and lit by microwave, and by the action of the starting aid, As with the case using the electrodeless lamp shown in the BS diagram, the startability was improved, and there was no damage to the covering (142) even after 1000 hours of lighting. In addition, in those using the electrodeless lamp shown in FIG. 1 or FIG. 3, the sheath shaft or (141) was damaged within several tens of minutes at the earliest.

As described above, the reason why the cover (142) was not damaged for a long time in the above example is that the starting auxiliary antenna (1st) and the cover (142) are heated due to the heat generated during discharge, and there is a gap between them. A difference in the amount of expansion occurs between the two sheets due to the difference in coefficient of thermal expansion, but this difference is absorbed by the starting auxiliary antenna (132) flailing in the air gap, and the difference occurs before the cover (142) is damaged. This is due to K's failure. - Since the gap formed between the starting auxiliary antenna (tSZ) and the covering body (142) was made into a vacuum, the starting auxiliary antenna (tSZ)
1!12) and the void space did not occur. Note that instead of making this gap a vacuum, it is also possible to fill it with a gas having a high dielectric strength.

FIG. 5 shows another embodiment of the present invention, in which the starting auxiliary body is provided with a starting auxiliary antenna (143) inside a covering body (143) consisting of a hollow protrusion projecting outward from the outer wall of the lamp.
s3) is accommodated through a vacuum gap, even if there are many such cases.

The same effect as that of the embodiment shown in FIG. 4 is achieved.

As described above, the present invention provides a microwave discharge light-water device in which an electrodeless lamp is disposed in a microwave cavity and the electrodeless lamp is lit by microwaves, in which a starting auxiliary antenna made of metal is connected to the air gap. Since the lamp is covered with a covering made of a heat-resistant dielectric material, the lamp starts easily and the covering does not get damaged when the lamp is lit.

This has the effect of extending the life of the starting aid and, by extension, the life of the lamp.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the configuration of a conventional microwave discharge light water device, #L2 and FIG. 3 are vertical cross-sectional views of an electrodeless lamp according to the prior art, and the fourth factor is an electrodeless lamp according to the present invention. FIG. 5 is a vertical sectional view showing another embodiment of the electrodeless lamp according to the present invention. In the figure, 113 (txt) (132) (15 is the starting auxiliary antenna, α4 (141) (142)
(us) is a covering. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 111//7 1 [Figure 2 @ Figure 3 Figure 4

Claims (1)

[Claims] (11! Microwave oscillator, a microwave electromagnetic field is formed by the microwaves oscillated by this micro-A oscillator. It has a member on at least one surface that continuously interrupts microwaves and allows light to pass through. A microwave cavity, an electrodeless lamp disposed within this microwave cavity, with a discharge luminescent substance sealed inside, and a metal starting auxiliary antenna and this starting auxiliary antenna placed in the air gap. The first 1k consists of a heat-resistant VJT covering body covered through the
17 A microphone equipped with an auxiliary body, and a solar discharge light source device. +21 Claim w, characterized in that the gap is a vacuum, the microwave discharge light source device according to claim 1 (31 Claim characterized in that the gap is filled with a gas with high dielectric strength) The microwave discharge light source device according to item 1.