JPS62241257A - Microwave discharge light source device - Google Patents

Abstract

PURPOSE:To shorten a rise time in emitting light, by forming a part of the lamp wall of a non-electrode lamp, on which a supporting part is projected, in a shape of a plane or a concave, and blowing cooled air, which flows along the supporting part, against said wall. CONSTITUTION:Microwave energy generated by a magnetron 1 is introduced through feeding port 8 to the inside of a microwave cavity 5 formed by a transilluminate member 7 of cylindrical metal mesh, to make the non-electrode lamp 9 luminous. The lamp wall 92, on which the supporting part 91 of the non-electrode lamp 9 is projected, shall be formed in a shape of a plane or a concave and shall be fixed with a flange-shaped member 10. Cooled air from the cooling fan 12 passes through a ventilating port 4 and feeding part 8 and flows along the supporting part 91, and blows against the lamp 9. Since the cooled air passes away from the lamp wall part 92', on which the supporting part 91 is projected, a rise time in emitting light can be shortened by raising temperature in the coolest point and also the lamp can be prevented from being broken by reducing the temperature difference between the upper part and the lower part of the lamp.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a light source device using microwave discharge, and particularly relates to improving the cooling effect of the lamp, improving the rising characteristics of the light output, and preventing damage to the lamp. It is something.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional microwave discharge light source device disclosed in, for example, Japanese Utility Model Application Publication No. 60-177458 and Japanese Utility Model Application Publication No. 60-177461.
(1) is a microwave oscillator Magne 1, Ron, (2
) is a magnetron antenna, (3) is a waveguide, (4) is a ventilation hole, (5) is a microwave cavity, and a cavity wall (6) connected to the end of the waveguide (3). The light transmitting member (7) is made of a cylindrical metal mesh. (8) is a feed port provided in the cavity wall (6) for feeding microwaves into the microwave cavity (5) made of the waveguide (3). (9) is a spherical electrodeless lamp (hereinafter not simply referred to as a lamp) placed inside the microwave cavity (5), which is filled with rare gas, mercury, halides, etc., and is made of quartz glass. It's starting to look like a translucent body. (91
) is a support part extending integrally from the outer wall (92) of the lamp (9), has a rod shape, and fixes the lamp (9) to the cavity wall (6) with a flange-like member (10). (11)l
The light reflecting plate (12) reflects the light emitted from the microphone mouth wave cavity (5), and the magnetron (1) and lamp (9)
(13) is a box body that covers the whole, (
14) is a streamline indicating the flow of cold air.

The operation of this device is as follows. Magnetron (1)
The microwave oscillated by the magnetron antenna (2)
is excited as a propagation mode from the waveguide (3). This microwave is fed through a feed port (8) to a microwave cavity (5) surrounded by a cavity wall (6) and a metal mesh (7). This microwave causes the rare gas in the lamp (9) to discharge, and this energy heats the lamp wall, evaporating and gasifying the enclosed mercury, etc., and the discharge is mainly a discharge of metal gas such as mercury. It emits light with a spectrum depending on the number of gas species. The emitted light (is emitted outward through the metal mesh, reflected by the light reflecting plate (11), and irradiated onto the irradiation surface.

On the other hand, the cold air from the cooling fan (12) cools the magnetron (]), passes through the ventilation port (4), and then passes through the power supply port (
8) toward the lamp (9), causing a dump (
After cooling 9), it passes through a metal mesh (7) and is discharged to the outside.

[Problem that the invention seeks to solve]

In the conventional microwave discharge light source device as described above, since the lamp is spherical, the lamp wall (92) to which the lamp support part (91) is joined is excessively cooled, and mercury, halides, etc. are enclosed. substances deposited on the lamp wall (9
2) Because the temperature is low, the vapor density in the vicinity is high,
There was a problem in that the upper part of the lamp was high in temperature, the steam temperature was low, and the discharge approached the tube wall, creating an increasingly high vortex and easily destroying the lamp (9).

The present invention has been made to solve these problems, and aims to provide a microwave discharge light source device that does not cause a delay in the rise of light emission and is less likely to cause damage to the lamp.

[Means for solving problems]

In the microwave discharge light source device according to the present invention, the protruding wall surface of the support portion of the lamp is formed into a flat or concave surface, and cold air is blown along the support rod onto the protruding surface of the support rod.

[Effect]

In the invention of B, the cold air avoids the lamp wall from which the support part protrudes, and the cooling of the lamp wall portion is small.
Encapsulants such as mercury and halides are less likely to be deposited, and therefore the coldest point temperature becomes high, and the evaporation of the inclusions at the time of startup is rapid, leading to a rapid rise in luminescence. On the other hand, the temperature difference between the lamp wall portion and the upper part of the lamp is reduced, and therefore the vapor density is also reduced, the discharge moves away from the tube wall, and damage to the lamp can be prevented.

〔Example〕

FIG. 1 is a cross-sectional view showing one embodiment of the present invention.
) to (13) are the same as those of the above-mentioned conventional device.

(92') is the lamp wall plane part from which the support part protrudes;
14') is a streamline showing the flow of cold air in this case.

In the microwave discharge light source device configured as described in Section 2, the flow of cold air avoids the lamp wall flat part (92'), and the cold air other than the cooling by conduction from the support part (91) The amount of cooling caused by this will be reduced, and there will be no excessive cooling.

Therefore, the rise of light emission becomes faster, and there is no need to heat the local area. Table 1 shows a comparison of the lamp wall temperature and the number of times the lamp was turned on until failure occurred when using the conventional cooling means shown in FIG. 3 and when using the cooling means according to the invention of Part B. The effects of this invention can also be understood from the results in Table 1.

Table 1 Lighting conditions: 10 seconds, 50 seconds off flashing lamp included crab 850w Figure 2 shows another example of the lamp shape, showing the shape of the lamp wall (92) relative to the support (9J). It is formed into a concave shape. In this case, the lamp wall (92'') is closer to the discharge side than in the above embodiment, and the temperature of the lamp wall (92''), which is the coldest part, can be increased.

〔Effect of the invention〕

As explained above, in this invention, the lamp wall part from which the support part protrudes is formed into a flat or concave surface, and the cold air flowing along the support part is blown toward the wall part B, thereby suppressing the rise of light emission. This has the effect of speeding up the process and preventing lamp damage.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the invention of Otsu, Fig. 2 is a sectional view of a lamp showing another embodiment of the invention, and Fig. 3 is a sectional view showing a conventional microwave discharge light source device. be. In the figure, (1) the magnetron (5) is a microwave cavity, (7) is a metal mesh, (8) is a power feed port, and (9) is a microwave cavity.
is a lamp, (91) is a support rod, (92), (92'),
(92'') is the lamp wall surface. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] Microwaves are supplied through the power supply port, and a microwave cavity has a light-transmitting member on at least a part of the wall surface, and a rod-shaped support part protrudes from the wall surface, and the support part is supported on the wall part of the microwave cavity. In the microwave discharge light source device equipped with an electrodeless lamp disposed in the microwave cavity, the electrodeless lamp has a supporting portion having a protruding surface formed in a flat or concave shape, and the supporting portion protruding surface. A microwave discharge light source device, characterized in that the microwave discharge light source device is configured to blow cold air flowing along the support portion.