JPS61116750A - Microwave discharge light source device - Google Patents

Abstract

PURPOSE:To prevent the tube wall of a no-electrode lamp from thermal damage due to a generated hot spot by making a cooling wind to flow through between a no-electrode lamp and an internal body contained through a space. CONSTITUTION:The gas inside a no-electrode lamp 8 is discharge-excited by a microwave for being heated and radiated. Simultaneously, the wind sent from a cooling fan enters the first ventilation tube 16 through a guide for ventilation while said wind goes through the space 21 between the no-electrode lamp internal body 14 and the no-electrode lamp 8. At this time, the sent air takes heat generated from the no-electrode lamp 8 from lighting away from the whole peripheral surface of the tube wall of the no-electrode lamp 8 for cooling the no-electrode lamp 8. Then, the air having cooled the no-electrode is exhausted outside through a ventilation tube 17. Thereby, no hot spot comes to generate on the tube wall of the no-electrode lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microwave discharge light source device that utilizes microwave discharge.

[Conventional technology]

Fig. 4(a), (bJ shows the conventional microwave discharge light source device shown in Utility Model Application Publication No. 58-34356,
1 is a magnetron that oscillates microwaves, 2 is a magnetron antenna, 3 is a waveguide, 4 is a rotationally symmetrical cavity wall, and 5 is a light-transmitting member provided in the opening of the cavity wall 4. , 6 is a microwave resonant cavity consisting of a hollow 7IIi 1 wall 4 and a light-transmitting member 5, and 7 is a microwave resonant cavity 6 for transmitting microwaves oscillated from the magnetron 1 and transmitted through the waveguide 3. 8 is a spherical electrodeless lamp disposed in the microwave resonant cavity 6; 9a and 9b are electrodeless lamps 8;
10 is a frame body for attaching the light-transmitting member 5, 11 is a cooling fan, 12 is an air blowing guide that guides the air from the cooling 7-an 11; 12 is attached to the bottom of the cavity wall 4, and an air outlet 13 for blowing air from the cooling fan 11 onto the electrodeless lamp 8 is formed on both sides.

Now, the operation of the above conventional device will be explained.

The microwave oscillated by the magnetron 1 passes through the waveguide 3 via the magnetron antenna 2, and is further radiated into the microwave resonant cavity 6 via the microwave feeding lower. The gas in the electrodeless lamp 8 is excited to discharge by the microwave ta field formed by the microwave, and generates heat and emits light. Then, the emitted light passes through the light-transmitting member 5 and is radiated to the outside. Further, the generated heat is lost when the air blown from the cooling ann 11 passes through the air outlet 13 and is applied to the electrodeless lamp 8. For this,
This prevents the electrodeless lamp 8 from overheating and being thermally damaged when lit.

[Problem that the invention seeks to solve]

However, in the conventional device described above, the air supplied into the microwave cavity 6 through the air outlet 13 forms a flow K as shown by the arrow in FIG. Since cooling air does not flow through the area 20 surrounded by , a hot spot is generated on the tube wall of the electrodeless lamp 8, and the electrodeless lamp 8 is easily damaged by heat when lit.

The present invention has been made to solve the above-mentioned problems, and it is possible to prevent hot spots from forming on the tube wall of the electrodeless lamp when the lamp is turned on, and to prevent thermal damage to the electrodeless lamp. The purpose of the present invention is to obtain a microwave discharge light source device that can be used.

[Means for solving problems]

A microwave discharge light source device according to the present invention includes: an electrodeless lamp enclosure that encloses an electrodeless lamp through a space; a first ventilation pipe that sends cooling air into this space; A second ventilation pipe is provided to exhaust the air.

[Sakumyo Shrine]

In the present invention, since the cooling air is passed between the electrodeless lamp and the inner body containing the electrodeless lamp through the space, the cooling air can flow around the entire circumference of the electrodeless lamp without any force or effort. Hot spots will no longer occur on the tube wall of electrode lamps, and electrodeless lamps will no longer be damaged by heat when lit.

〔Example〕

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

In Figure 1 (a), (b) and Figure 2, 14
15 is an electrodeless rung encapsulation body that encloses an electrodeless lamp 8 and has a space 21 between it and the entire circumferential surface of the tube wall of the electrodeless lamp 8;
a and 15b are fixing parts for fixing the electrodeless lamp 8 through a space within the electrodeless lamp inner casing 14; A ventilation pipe 1 is introduced into the rung inner envelope 14, and a second ventilation pipe 17 is used to exhaust air from the electrodeless lamp inner envelope 14.

In the above configuration, the gas in the electrodeless lamp 8 is discharge-excited by microwaves to generate heat and emit light, as in the conventional case. At the same time, the air blown from the cooling fan 11 passes through the air blowing guide 12 and enters the first ventilation pipe 16VC, and this air passes through the space 21 between the 11-poleless lamp inner envelope 14 and the electrodeless lamp 80. At this time, the blown air removes the heat generated from the electrodeless lamp 8 during lighting from the entire circumferential surface of the tube wall of the pole rung 8, and the electrodeless lamp 8 is cooled. The air that has cooled the electrodeless lamp 8 blows through the second ventilation pipe 17 and is discharged to the outside.In this way, the cooling air is distributed all around the electrodeless lamp 8 as shown by the arrow in FIG. Because it flows,
The unrelenting lamp 8 is effectively cooled.

〔Effect of the invention〕

As described above, in the present invention, an inner body is provided that encloses the electrodeless lamp through a space, and the cooling air is passed through the space, so that the cooling air is passed around the entire circumference of the electrodeless lamp. Since hot spots are no longer generated on the tube wall of the electrodeless lamp, thermal damage during lighting of the electrodeless lamp can be prevented.

[Brief explanation of drawings]

Figures 1 (a) and (b) are respectively a plan view and a vertical front view of the device of the present invention, Figure 2 is an enlarged sectional view of the electrodeless lamp portion of the device of the present invention, and Figure 3 is the electrodeless lamp of the conventional device. 4A and 4B are a plan view and a longitudinal sectional front view of the conventional device, respectively. DESCRIPTION OF SYMBOLS 1... Magnetron, 3... Waveguide, 6... Microwave resonance cavity, 8... Electrodeless lamp, 11... Cooling fan, 12... Air blowing guide, 14... ...electrodeless lamp inner body, 15a, 15b...fixing part, 16.
...First ventilation pipe, 17...Second ventilation pipe, 21...
·space. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An electrodeless lamp is placed inside the microwave resonant cavity,
A microwave discharge light source device in which the electrodeless lamp is discharged and emitted light by a microwave electromagnetic field includes an electrodeless lamp casing that encloses the electrodeless lamp so as to have a space around its entire circumference, and a cooling air blowing into the space. A microwave discharge light source device comprising: a first ventilation pipe for introducing cooling air into the space; and a second ventilation pipe for discharging cooling air that has passed through the space on the entire circumference of the electrodeless lamp to the outside. .