JPS61208742A - Electrodeless electric-discharge lamp - Google Patents

Abstract

PURPOSE:To increase the luminous output of an electrodeless electric-discharge lamp for the near ultraviolet region by charging the translucent case of the lamp, which is excited by microwaves to emit light, with a rare gas, mercury and a chloride of osmium, ruthenium or a similar element. CONSTITUTION:An electrodeless electric-discharge lamp 6 is produced by using a hollow cylindrical translucent case 7, which consists of a semispherical closed surface 8 and a closed surface which has a concave area 9 for accomodating an antenna 5 in the center, and chargintg the case 7 with a rare gas such as argon, mercury and at least one compound of the chloride of osmium, ruthenium, rhodium or rhenium. The lamp 6 is installed in a reflector 10 closed with a metallic mesh plate 11. Microwaves from a magnetron 1 are radiated through the antenna 5 upon the lamp 6 to make it emit light. Due to the above structure, the output of the lamp 6 for the near ultraviolet region can be greatly increased by properly selecting the amount of the chloride of osmium or a similar element charged in the lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electrodeless discharge lamp that utilizes microwave discharge.

[Technical background of the invention and its problems]

Conventionally, a discharge lamp generally has a pair of electrodes facing each other and utilizes light generated by a discharge generated between the electrodes. However, in this type of discharge lamp, the light output decreases due to blackening of the inner surface of the arc tube caused by evaporation and scattering of the electrode material and emitter.

Alternatively, disadvantages such as deterioration of the characteristics of the electrode itself are unavoidable.

In recent years, efforts have been made to improve these shortcomings.

Electrodeless discharge lamps excited by high-frequency discharge, particularly high-frequency microwaves, are beginning to be put into practical use.

Since this discharge lamp does not have electrodes, it has the advantage of having a longer service life than the conventional discharge lamps having electrodes. As a near-ultraviolet light source, an electrodeless discharge lamp is used, in which one or more halides of iron (Fe, nickel (Ni), cobalt (Co), and palladium (Pd)) are sealed together with a rare gas for starting and mercury, and which emits light when excited by microwaves. has been done.

However, as the amount of Fe, Ni, Co, and Pd added increases, the amount of light emitted gradually increases.

Due to its large self-absorption, increasing the amount of filler beyond a certain point has the disadvantage that the amount of light emitted decreases.Therefore, there has been a desire for a near-ultraviolet electrodeless discharge lamp with even better light-emitting characteristics. .

[Purpose of the invention]

The present invention has been made in response to the above-mentioned circumstances.

An object of the present invention is to provide an electrodeless discharge lamp that has a higher output than conventional ones in the near-ultraviolet region.

[Summary of the invention]

The present invention provides an electrodeless discharge lamp that emits light excited by microwaves, in which Os is used together with a rare gas and mercury.

It is characterized by containing one or more of each of Ru, Rh, and Re chlorides.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a schematic diagram of a lighting device for an electrodeless discharge lamp.
) is a magnetron that generates microwaves.

A cooling fan (3) is provided in a case (2) housing the magnetron (1). (4) is the power supply for the magnetron. An antenna (5) for emitting microwaves is provided at one end of the magnetron (1) led out from the case (2), and an electrodeless discharge lamp (6) is attached to the end of this antenna (5). ing. The electrodeless discharge lamp (6) is shown enlarged in Fig. 2 as shown in Fig. 5, a hollow cylindrical translucent container made of quartz glass with an inner volume of 20c, and a hollow cylindrical container (with a starting diode in the direction). The gases are 20 torr of argon and 70 to 70 m of mercury.Rhodium chloride Rh (438 cm) is sealed, and one end of the closed surface forms a hemispherical spherical surface (8), and the antenna (5) is located in the center of the other end of the closed surface. A recess (9) is formed into which the IG is inserted. Also, (IG) is a light reflector whose front surface is made of, for example, a metal mesh plate αυ that transmits light but does not transmit microwaves.

Emit light forward.

According to such a lighting device, microwaves generated by the magnetron (1)K are radiated into the recess (9) by the antenna (5) to form a microwave electromagnetic field. This electromagnetic field first discharges the argon gas sealed in the electrodeless discharge lamp (6) and heats the wall of the translucent container, and then the rhodium chloride evaporates and becomes a metal vapor discharge, reaching a stable state. .

Produces near-ultraviolet light emission unique to rhodium h. The near-ultraviolet output at this time was much better than that of the conventional electrodeless discharge lamp.

Figure 3 shows rhodium chloride RhC in an electrodeless discharge lamp of the same structure.
75 and a conventional iron iodide Fe12 are respectively encapsulated, and the near ultraviolet (300 to 400 nm) outputs are compared in cases where the amounts of these encapsulated substances are varied.

As is clear from this figure, when the amount of FeI2 enclosed exceeds about 1.0 mol/c, the output decreases rapidly. On the other hand, in the case of the RhCl3-enclosed product of the present invention, the output does not decrease even if it exceeds 1.0 mol/c, c, but gradually decreases when it exceeds about 167 mol/c, c. This is because Rh is originally 3 compared to Fe.
Although the output in the near ultraviolet region of 00 to 4QQnrn is superior.

Furthermore, since KRh has much less self-absorption than Fe, the peak of the output shifts to the side where the amount of inclusion is large.
No. 11 has an output approximately 25% higher in terms of absolute strength than Fe.

In addition, we explained the case of rhodium chloride when it is 0 or more.
Similar effects can be obtained when chlorides of osmium Os, ruthenium Ru, and rhenium Re are used, and 28i or more of these chlorides can also be used in combination.

However, even halides of the same metal.

The use of iodides or bromides other than chloride is inappropriate. The reason for this is that even in the case of an electrodeless discharge lamp, the temperature of the coldest part must be at least 5°C or higher, preferably 6°C, in order to obtain 9 luminescence, just as with metal halide lamps equipped with general electrodes.
00 to 800 DEG C. is required, but the iodides and bromides of the aforementioned metals are unstable and decompose in this temperature range, making it impossible to continuously supply the starting metal during the arc.

〔Effect of the invention〕

As described above, according to the present invention, Os, Ru, Rh, l(e
Since it is sealed in the form of chloride, the near-ultraviolet output is significantly improved compared to conventional electrodeless discharge lamps of this type, making it possible to obtain an excellent light source for photochemical reactions.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a lighting device for an electrodeless discharge lamp which is an embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of the same electrodeless discharge lamp, and FIG. 9 is a comparison diagram of changes in characteristics when the amount of luminescent metal enclosed in an electric lamp is changed. (1)・・・Magnetron, (5)・・・・・・
antenna. (6)... Electrodeless discharge lamp, (power...
Translucent container. (9)・・・Recess of translucent container Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2

Claims (1)

[Claims] In an electrodeless discharge lamp that emits light when excited by microwaves, the discharge lamp includes a rare gas, mercury, and one or more chlorides of osmium Os, ruthenium Ru, rhodium Rh, and rhenium Re sealed in a transparent container. An electrodeless discharge lamp characterized by: