JPH02810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a microwave discharge light source device that utilizes microwave discharge.

[Conventional technology]

Figures 3 and 4 are a cross-sectional view and an enlarged view of a metal mesh plate of a conventional microwave discharge light source device disclosed in, for example, Japanese Patent Application Laid-Open No. 58-194242. In the figure, 1 is a magnetron that generates microwaves. ,2
is a magnetron antenna, 3 is a waveguide that transmits microwaves, 4 is a microwave cavity wall that also serves as a light reflecting surface, and 5 is a metal mesh plate made of a light-transmitting member that transmits light but reflects microwaves. It is attached to the opening of the cavity wall 4 with the fixing ring 6 and screws 7, and a microwave resonant cavity 8 is formed by the cavity wall 4 and the metal mesh plate 5. Reference numeral 9 denotes an electrodeless discharge lamp disposed within the cavity 8 via a support rod 10, 11 a microwave power supply port drilled in a part of the cavity wall 4, and 12 an electrodeless discharge lamp provided outside the metal mesh plate 5. This is a lens that focuses the light emitted onto the irradiated surface.

The conventional microwave discharge light source device is configured as described above, and the microwave oscillated from the magnetron 1 is transmitted from the antenna 2 through the waveguide 3 to the feed port 11.
is radiated into the microwave cavity 8 from. As a result, a microwave electromagnetic field is generated within the cavity 8, and the gas or metal vapor sealed within the electrodeless discharge lamp 9 discharges and emits light. This light is transmitted directly from the lamp 9 or reflected from the cavity wall 4 to the metal mesh plate 5.
is emitted through the The metal mesh plate 5 is the fourth
As shown in the figure, it has a lattice shape, and for example, as the aperture ratio increases, microwave leakage and loss increase and the role of the cavity 8 decreases, and conversely, as the aperture ratio decreases, the light transmittance decreases. Therefore the aperture ratio is 60~95
%, and the mesh board is relatively thin. Further, the pitch wp and the strand width ws of the mesh plate 5 are uniform. On the other hand, the fifth
The figure shows a microwave discharge light source device shown in Japanese Patent Application No. 59-39980. In this case, most of the cavity wall 4 forming the microwave cavity 8 is formed of a metal mesh plate 5. The operation of this device is the same as that shown in FIG. 3, but the light from the lamp 9 is reflected by the light reflecting plate 13 to illuminate the irradiated surface.

[Problem that the invention attempts to solve]

In the conventional microwave discharge light source device as described above, the metal mesh plate shown in Figure 5 has a thin wire width and a thin wall, so its mechanical strength is weak and it does not deform under external pressure. There was a problem that the microwave cavity easily ceased to function as a microwave cavity.

This idea was made to solve these problems, and is a microwave discharge light source device that improves mechanical strength without reducing light transmittance and has a microwave cavity wall that does not deform due to external pressure. The purpose is to obtain.

[Means for solving problems]

The microwave discharge light source device according to this invention is characterized in that the metal mesh plate is formed to include thick wires arranged at equal intervals.

[Effect]

In this invention, the metal mesh plate is formed by inserting thick strands at equal intervals, so that the thermal deformation of the thin strands due to the surface current of the microwave is made uniform, and the stress applied to the mesh is reduced. become even.

〔Example〕

Figures 1 and 2 are a perspective view of a cavity wall and an enlarged view of a metal mesh plate of a microwave discharge light source device showing an embodiment of this invention. It consists of a metal mesh plate 5b, 14 is a mounting flange for attaching to a reflecting plate (not shown) having a mounting hole 14a, and 15 is a metal ring for reinforcing positioning and mechanical strength during manufacturing of the cavity wall 4. Edging allowances 16 are provided at the ends of the metal mesh plates 5a and 5b.

The metal mesh plate 5 has strands of wire 5 as shown in FIG.
Wide strands, in other words, thick strands 52 are provided at every equal interval (every 5 strands in the embodiment). Thereby, the mechanical strength of the microwave cavity wall 4 can be increased without deforming due to external pressure.

The microwave cavity wall 4 configured as described above is used by being attached to the microwave discharge light source device shown in FIG. Thermal deformation of the thin strands due to the surface current of the microwave is made uniform by placing the thick strands at equal intervals. . Further, since the metal mesh plate 5 is formed by inserting thick strands 52 at equal intervals, the stress applied to the mesh becomes uniform and the mechanical strength becomes strong against deformation. In the embodiment, a metal mesh plate having a lattice shape is shown, but the same effect as described above can be obtained by providing a wide strand portion not only in a lattice shape but also in other shapes. Furthermore, in this embodiment, a wide strand is provided parallel to and perpendicular to other narrow strands, but for example, the above wide strand may be connected to another narrow strand, e.g. It goes without saying that the wires may be provided at different corners depending on the purpose of reinforcing the metal mesh plate, rather than simply making some of the wires to be wide wires.

[Effect of idea]

As explained above, this device has a metal mesh plate that includes thick strands placed at equal intervals, thereby uniformizing the thermal deformation of the thin strands caused by the surface current of the microwave. Furthermore, the mechanical strength against external pressures such as bending, compression, and tension is improved, making it possible to prevent various deformations that are applied to the microwave cavity. properties and performance can be maintained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a microwave cavity wall of a microwave discharge light source device showing one embodiment of this invention;
The figures are enlarged views of the metal mesh plate, Figures 3 and 4.
The figures are a sectional view and an enlarged view of a metal mesh plate of a conventional microwave discharge light source device, and FIG. 5 is a diagram of another conventional microwave discharge light source device. 1... Magnetron, 4... Microwave cavity wall, 5... Metal mesh plate, 51... Element wire, 52
...Wide wire portion, 9...Electrodeless discharge lamp. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a microwave discharge light source device in which an electrodeless discharge lamp is disposed in a microwave cavity at least a portion of which is made of a light-transmitting member, the light-transmitting member is made of a metal mesh plate, and the metal mesh plate is made of a metal mesh plate. A microwave discharge light source device characterized in that it is formed to include thick wires arranged at equal intervals.