JPS608583B2 - Microwave discharge light source device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light source device that utilizes microwave discharge.

BACKGROUND ART Recently, light source devices that use high-frequency discharge, particularly microwaves as high-frequency waves, have been attracting attention as light source devices that utilize electric discharge.

In conventional light source devices with electrodes, the life of the lamp was determined by the wear and tear of the electrodes, but in light source devices using microwaves, the lamp can be made electrodeless, so it has the advantage of a longer lamp life. Also, there is no heat loss due to electrodes,
Since the difference in discharge impedance between the initial lighting state and the stable lighting state is small, it is easy to inject power in the initial lighting state.Furthermore, since the discharge power is biased towards the lamp tube wall, it is difficult to reach the maximum output of the lamp. Another advantage is that it takes less time.

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a microwave discharge light source device previously proposed by the applicant by utilizing these features.

In the figure, 1 is a magnetron, 2 is a magnetron antenna, 3 is a waveguide, 4 is a microwave cavity configured in a hemispherical shape, and 5 is a microwave provided at the junction of this hollow ear 4 and the waveguide 3. The power supply port 6 is a spherical lamp with two protrusions 11 protruding outward in a symmetrical direction from the outer surface.
1 is engaged with a support portion 13 formed on the wall portion 41 of the microwave cavity 4 . 7 is a fan, 8 is a vent provided on the back of the cavity 4, 9 is a mesh plate that covers the front of the air arm 4, and a box body that houses the magnetron 1, the waveguide 3, the air arm 4, etc. It is.

Next, the operation will be explained. Microwaves generated by a magnetron 1 are radiated into a waveguide 3 through a magnetron antenna 2. This microwave propagates through the waveguide 3 and is radiated into the cavity 4 through the feed port 5, forming a microwave electromagnetic field in the cavity 4. Due to this microwave electromagnetic field, the rare gas in the lamp 6 is discharged, the tube wall is heated, the metal such as mercury in the tube is evaporated and gasified, and a discharge of the metal gas occurs. At this time, light with a specific emission spectrum depending on the type of metal is generated. In order to utilize this light effectively, a reflective surface is formed on the rear surface of the cavity 4, and the front surface is covered with a mesh plate that does not transmit microwaves but transmits light, so that light is emitted only to the front surface. On the other hand, "Since magnetron 1 and lamp 6 need to be cooled,
Air is sent by a fan 7 to cool the magnetron tortoise, and the air is also configured to cool the lamp 6 through a vent 8 and then to be exhausted from a closing plate 9. In the microwave light source device configured in this way, the lamp 6
Since the light intensity is small, it is easy to obtain a desired illuminance distribution by appropriately shaping the reflecting surfaces of the sky 8 and 4. Further, there are advantages such as being able to reduce unevenness in the emission intensity distribution due to unevenness in the distribution of the microwave electromagnetic field, and uniformly irradiating the surface to be irradiated.
However, the support structure for the lamp 6 is such that the protruding part 11 protruding from the lamp 6 is inserted into the supporting part 13 provided in a concave shape on the microwave cavity wall 411 and is supported.

Therefore, the length of the momentum protrusion 11 becomes long, and if the diameter is made thicker, the heat capacity increases and the lighting characteristics of the lamp 6 are impaired. The lamp protrusion 11 often breaks when attached to the microwave, making the lamp 6 unusable.This invention was made in view of the above circumstances, and the lamp support is mounted on the same wall as the microwave oven. The length of the lamp projection can be shortened by using a holding spring to allow the body to move forward and backward into the same space as the microwave ear, and by supporting the lamp support on the lamp support. west,
It is an object of the present invention to provide a microwave discharge light source device that can prevent accidental breakage of the lamp protrusion without impairing the lighting characteristics of the lamp, and can effectively use the lamp.

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

In FIG. 2, reference numeral 12 has a bulging part turtle 1 at one end that is inserted into a lamp support insertion hole 13b of a support part 13 formed in a cavity wall 41, and a lamp protruding part 11 is supported at the end of the cavity. Two cylindrical lamp supports each having a protrusion insertion hole 16 formed therein are provided facing each other so that the distance between their free ends is approximately the same as the outer diameter of the lamp 6. 14 is a holding spring that is housed in the lamp support insertion hole 13b and biases the lamp support 12 in the direction of the lamp 6; 15 is a lamp support insertion hole 13b.
A spring stopper 13 which is iron-coupled and receives one end of the retaining spring turtle 4.
is provided protruding outward from the cavity wall 48 and has the lamp support 12 inside.
A stopper portion 18 is formed to support the expansion portion 17 of the holder.

The lamp support 2 is made of a quartz tube in order to reduce disturbances in the electromagnetic field distribution within the lamp support 4.
The spring stopper 15 and the lamp support insertion hole 13b are made of a metal that does not transmit microwaves to the same device as the microwave Soratsukioka 4. Next, the installation of the lamp 6 will be explained.

One of the lamp supports 12 is pressed so that the holding spring 14 is displaced in the compression direction to increase the distance between the lamp supports 12. Next, insert one lamp protrusion 11 into the protrusion insertion hole 16 of the lamp support 12 that is being pressed, and while returning the lamp support 12 to its original position, the other lamp support 1
When the lamp 6 is inserted into the protrusion insertion hole 16 of No. 2, the lamp 6 is securely held in a predetermined position and the installation is completed. Further, in order to separate the lamp 6 from the lamp support 12, one lamp support 12 is pressed in the direction of compression of the holding spring 4, the interval between the lamp supports 12 is widened, and the lamp protruding part 12 is moved away from the lamp support 12.
The removal operation is completed by pulling it out from the protrusion insertion hole 16. FIG. 3 is a partial sectional view showing another embodiment of the invention.

In the figure, reference numeral 15 denotes a spring stopper having a screw hook 5a on its outer periphery that engages with a screw 13a formed in the lamp support insertion hole 13. In this way, the repulsive force of the holding spring 14 can be reliably resisted, and leakage of microwaves can also be prevented more reliably. In each of the above embodiments, the holding spring 14 was provided corresponding to each lamp support 12, but the holding spring 14 may be provided only on one side and the other lamp support 12 may be fixed.

Furthermore, the material of the spring retainer 5 which is fitted into the lamp support insertion hole 13b and which receives one end of the holding spring 14 is not limited to the above-mentioned metal, but may be a structural lamp support insertion hole 13b that does not transmit microwaves. Non-metallic materials may also be used. or"
The structure of the spring stopper 15 is not limited to the above-mentioned closed structure, but may be an open structure as long as the lamp support insertion hole 13b is configured to securely receive one end of the holding spring 14 and is not transparent to microwaves. As explained above, in this invention, a lamp support is attached to the wall surface of a microwave cavity space using a holding spring so as to be movable forward and backward so as to protrude into the microwave cavity space, and the protruding part of the lamp is attached to the lamp support. By supporting the lamp, the length of the lamp protrusion can be shortened.
It can withstand the vibrations received during transportation of the lamp, and can reduce the bending moment that causes breakage during lamp assembly, so accidents of breakage of the protrusion can be extremely reduced.

Furthermore, since the diameter of the protrusion does not need to be particularly large, it does not affect the lamp lighting characteristics in any way. Therefore, according to the present invention, there is an effect that the lamp can be used effectively without impairing the lighting characteristics of the lamp.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a microwave discharge light source device previously proposed by the applicant, FIG. 2 is a partial cross-sectional view showing one embodiment of the present invention, and FIG. It is a partial sectional view showing an example. In the figure, i is a magnetron, and 4 is a microwave simulator.
6 is a lamp t ll is a lamp protrusion, 12 is a lamp support, 13b is a lamp support insertion hole, 14 is a holding spring,
15 is a spring stopper. Note that the same reference numerals in the figures indicate the same or corresponding parts. ↑Figure 2Figure 3

Claims (1)

[Scope of Claims] 1. A microwave cavity resonator having a lamp support insertion hole formed in a wall surface, a lamp support inserted through the support insertion hole and having a lamp support portion formed at one end, and supported by the lamp support. the lamp is housed in the lamp support insertion hole,
A microwave discharge light source device comprising: a holding spring that biases the lamp support in the direction of the lamp; and a spring stopper that is fitted into the lamp support insertion hole and receives one end of the holding spring. 2. The microwave discharge light source device according to claim 1, wherein the spring stopper is made of a metal material. 3. Claims 1 or 2, characterized in that the spring stopper is a screw body that is screwed into the lamp support insertion hole.
Microwave discharge light source device as described in 2. 4. The microwave discharge light source device according to claim 1, characterized in that the lamp supports are arranged as a pair, and the lamp support parts of these lamp supports are arranged to face each other.