JPS638051Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is aimed at a starting aid placed inside a waveguide or inside a microwave cavity in order to ensure the starting of an electrodeless discharge lamp that is lit inside a microwave cavity. The present invention relates to a second electrodeless discharge lamp.

Conventionally, in devices that have an electrodeless discharge lamp that is lit inside a microwave cavity, the impedance of the lamp is significantly different before and after the lamp is lit, so the impedance inside the microwave cavity is the same as when the lamp is lit. Usually, it is configured to match the impedance of the microwave oscillator. Therefore, when starting the lamp, little microwave energy can be supplied into the microwave cavity. Furthermore, the leakage electromagnetic field of the microwave that leaks slightly from the power supply port rapidly attenuates as it moves away from the power supply port, and is extremely weakened at the normal lamp installation position located at the center of the microwave cavity.
For this reason, a lamp disposed in a microwave discharge light source device having such a configuration has the disadvantage that starting is uncertain.

On the other hand, the inventors and others have proposed that microwaves should be placed inside the waveguide where a strong microwave electromagnetic field is formed even if the lamp does not start first, or in the microwave cavity near the feed port where the strength of the leakage electromagnetic field is relatively strong. disposing a second electrodeless lamp lit by energy;
When the microwave is oscillated, first, this second electrodeless lamp (hereinafter referred to as the second lamp) is turned on, and the ultraviolet rays emitted at this time are used as the main light source, the electrodeless lamp (hereinafter referred to as the first lamp). proposed a microwave discharge light source device that causes weak ionization in the first lamp by irradiating the first lamp with a microwave electromagnetic field (referred to as the term "component"), and enables reliable starting by a weak leakage microwave electromagnetic field in the vicinity of the first lamp. However, since the second lamp in this case was a quartz glass tube expanded into a spherical shape, there was a problem in that manufacturing was complicated.

This invention was made in view of the above problems, and is intended to provide an electrodeless discharge lamp that is extremely easy to manufacture. This invention will be explained in detail below based on examples. FIG. 1 is a sectional view showing a second lamp according to this invention, in which 1 is a bulb, a cylindrical light-emitting part 2 made of a transparent quartz tube, and a press seal that press-seals both ends of this light-emitting part 2. It consists of part 3. Reference numeral 4 is a thin support rod whose one end is welded to this press seal portion 3 and is made of the same material as the valve 1.The valve 1 is also filled with mercury 5 in addition to argon as a starting rare gas. There is.

To manufacture the second lamp having the above configuration, first attach a long and thin quartz tube with one end press-sealed to an exhaust device (not shown) as shown in Figure 2, and then burn and degas the entire tube. conduct. Next, argon is introduced at a predetermined pressure, and then a predetermined amount of mercury 5 (for example, 0.5 mg if the length of the light emitting part 2 is 7 mm and its inner diameter is 3.5 mmφ) is introduced dropwise so that the light emitting part 2 has a specified length. Press-seal the side opposite to the first press-sealed side with the dimensions. While this state is maintained, a predetermined amount of mercury 5 is dropped and sealed, and the light emitting part 2 is press-sealed 3 to a size such that the light emitting part 2 has a specified length. By sequentially repeating the above steps, it is possible to form a plurality of second lamp bulbs 1 in which both ends of a single elongated quartz tube are press-sealed. Thereafter, the press seal part 3 is cut approximately at the center using a cutter to separate each part. A thin supporting rod 4 is welded to one end of the press seal portion 3 of each bulb 1 separated in this manner, thereby completing the second lamp.

Note that the welding position of the thin rod 4 does not necessarily have to be the press seal part 3, but when trying to weld it to the light emitting part 2, the heat during welding may cause a dent in the light emitting part 2. Welding to the press seal 3 is most advantageous.

Furthermore, in the above embodiment, the shape of the supporting thin rod 4 is shown as being bent, but this shape may also be a straight shape, or it may be provided at both ends of the press seal portion according to the necessity of the supporting method. Of course it's a good thing.

As explained above, according to this invention, in an electrodeless discharge lamp formed of an ultraviolet-transparent material,
Since the bulb has a cylindrical shape with both ends press-sealed, a plurality of light emitting parts can be manufactured continuously in a short time on a long and thin blank tube, which has the advantage of facilitating manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an electrodeless discharge lamp according to this invention, and FIG. 2 is a sectional view illustrating its manufacturing process. In the figure, 1 is the valve, 3 is the press seal part,
4 indicates a thin rod for support. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an electrodeless discharge lamp in which at least rare gas and mercury are sealed in a bulb made of an ultraviolet-transparent material, the bulb has a cylindrical shape, both ends of which are press-sealed, and the press-sealed portion is An electrodeless discharge lamp characterized in that a thin rod for supporting the lamp made of the same material as the bulb is connected to at least one side of the lamp.