JPS638006Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microwave discharge light source device in which a mesh is provided in at least a part of a microwave cavity.

The network of the microwave cavity in this type of microwave discharge light source device is designed to allow the light of the discharge lamp emitted within the microwave cavity to be radiated to the outside, and to allow microwaves to leak from inside the microwave cavity to the outside. It is used to prevent
However, if the mesh of the net is made larger in order to increase the amount of light emitted, there is a problem that microwave leakage occurs, and there is a drawback that the use of the net must be done at the expense of light utilization efficiency. Ta.

This invention was made to improve the above-mentioned drawbacks, by making the net into two independent nets and forming a space between the nets.
The present invention aims to provide a microwave discharge light source device with improved light utilization efficiency.

An embodiment of this invention will be described below with reference to the drawings. 1 is a magnetron that oscillates microwaves, 2
3 is a magnetron antenna, 3 is a waveguide for guiding microwaves, 4 is a microwave cavity formed by rotationally symmetrical inner wall 41 and whose front opening is covered with a net 42, and 5 is an empty space. A microwave power supply port is provided at the joint between the body 4 and the waveguide 3, 6 is a spherical discharge lamp disposed within the cavity 4, and 7 is connected to the magnetron 1 and means (not shown). a fan 8 for cooling the discharge lamp 6 fixed to the
9 is a vent provided in a part of the waveguide 3, and 9 is a box that covers the magnetron 1, the waveguide 3, the cavity 4, etc.

In such a device, the above-mentioned net body 42
A second mesh body 43 is provided at a distance from the center. That is, the second net 43 is connected to the net 42 through a ring-shaped spacer 11 that corresponds to the flange 44 formed at the opening edge of the inner wall 41, and whose surfaces are parallel to each other. 42 and is fixed by the fixture 12 and the mounting screw 13 while being spaced apart from each other so as to form a space therebetween.

In the microwave discharge light source device configured in this manner, the second net 43 allows the light that has passed through the net 42 to pass to the outside according to its own aperture ratio. On the other hand, unlike light, microwaves have the characteristic that the energy that passes through a mesh-like network is greatly attenuated. Therefore, the net body 42
Even if microwaves leak from the second net 43
effectively reflects microwaves. Therefore, net body 4
By appropriately selecting the aperture ratio of the mesh of the second net 42 and the second net 43 and the installation interval between the two nets 42 and 43, the amount of light emitted to the outside can be increased while preventing microwave leakage.

Note that both net bodies 42 and 43 in the above embodiment
The material used was formed by etching a metal plate having a thickness of several tens to hundreds of microns. Furthermore, if the aperture ratios of both the nets 42 and 43 are made the same, the number of types of parts can be reduced and errors during assembly can be prevented. Furthermore, by setting the aperture ratio of the net 42 to be smaller than that of the second net 43, microwaves can be effectively absorbed into the discharge lamp 6, thereby increasing the light output of the discharge lamp 6. be.

As explained above, according to this invention, in a microwave discharge light source device in which a mesh is disposed in at least a part of the microwave cavity, the mesh is divided into two meshes that are independent of each other with a space between them. So,
Since a large amount of light can be obtained while preventing leakage of microwaves, it is possible to provide a microwave discharge light source device with improved light utilization efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a microwave discharge light source device showing an embodiment of this invention, and FIG. 2 is an exploded perspective view showing the main components thereof, partially in section. Note that the same reference numerals in each figure represent the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A microwave discharge light source device in which a discharge lamp is disposed in a microwave cavity having a mesh body on at least one surface thereof, and the lamp is lit by a microwave electromagnetic field formed in the microwave cavity, characterized in that a second mesh body is provided on the outer surface side of the mesh body so as to form a space between the second mesh body and the outer surface of the mesh body.