JPS638009Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a microwave discharge light source device that discharges and emits light from an electrodeless lamp within a microwave cavity.
In particular, the present invention relates to an attachment mechanism for a metal net that forms one wall of a microwave cavity and is detachably attached to the microwave cavity main body.

In recent years, a light source device that discharges an electrodeless discharge lamp using high frequency waves, particularly microwaves, has been attracting attention. This type of device usually has a microwave cavity formed by a microwave cavity body that reflects light and microwaves and a metal mesh that substantially transmits light but reflects microwaves, and has no electrodes inside. The structure is equipped with a discharge lamp.

1 and 2 show a conventional microwave discharge light source device, in which 1 is a spherical electrodeless lamp, 2 is a concave microwave cavity body whose inner surface is a reflective surface for light and microwaves, and 3 is a concave microwave cavity body whose inner surface is a reflective surface for light and microwaves. Microwave cavity body 2
4 is a microwave constituted by the cooperation of the microwave cavity body 2 and the mesh 3; A cavity, the electrodeless lamp 1 is arranged within this microwave cavity 4 . Reference numeral 5 denotes a flange portion formed around the opening of the microwave cavity main body 2, and its width is 1 cm. 6
7 is an annular presser with a width of 1 cm and a thickness of 2.5 mm for mounting the mesh 3 in contact with the flange portion 5; 7 is a catch clip for applying contact force to the presser 6; It is attached to the back side of the flange portion 5. Reference numeral 8 indicates a hooking metal fitting which is spot welded to the presser holder 6 at regular intervals of 120 degrees in order to hook the hook part of the catch clip 7 onto the presser 6. Reference numeral 9 indicates a glass lens for controlling light distribution. 3 are placed opposite each other with a gap in between. 10 is a waveguide joined to the side of the microwave cavity body 2, 11 is a power feeding port provided between the microwave cavity body 2 and the waveguide 10, and 12 is a waveguide whose inner diameter is a cut-off dimension. The air blowing pipe 12 is formed at the bottom of the microwave cavity body 2. One of the hooks 8 is on an extension of the waveguide 10. In addition, the inner diameter of the flange portion 5 and the presser 6 is 15 cm, and the presser 6
The gap between the upper surface and the lower surface of the lens 9 is 1 cm.

In the conventional device described above, microwave energy is supplied into the microwave cavity 4 through the waveguide 10 and the feed port 11, forming a strong microwave electromagnetic field within the microwave cavity 4. The electrodeless lamp 1 absorbs microwave energy from this microwave electromagnetic field and sustains discharge. At this time, in order to prevent damage to the electrodeless lamp 1 due to heat generation, cooling air from the blower pipe 12 and a ventilation hole (not shown) provided in the waveguide 10 are supplied to the waveguide 10 and the power supply. Cooling air is blown through the ports 11, respectively. After cooling the electrodeless lamp 1, these cooling air passes through the mesh 3, the gap between the presser 6 and the lens 9, and is discharged to the outside.

However, in the above-mentioned conventional device, a strong microwave electromagnetic field is formed in the microwave cavity 4 during operation, and the closeness between the presser 6 and the flange 5 deteriorates, causing the flange portion to be damaged by the presser 6. The periphery of the mesh 3 and the flange portion 5 that were in close contact with the mesh 3
If there is a gap between the
The lamp 1 may flicker while being lit, and the mesh 3 may be damaged due to discharge.
Such a gap between the periphery of the mesh 3 and the flange portion 5 is caused by deformation of the presser 6 due to the contact force of the catch clip 7.
This gap becomes larger in the middle of the attachment position of the catch clip 7. Therefore, the discharge that occurs in the gap is likely to occur between the flange portion 5 and the mesh 3 on the power feeding side, that is, on the side where the waveguide 10 is connected. This is because the microwave electric field becomes strong in the vicinity of the power supply port 11, especially at the beginning of the lighting of the electrodeless lamp 1, until the filling material in the electrodeless lamp 1 sufficiently evaporates and the microwave energy can be sufficiently absorbed. This is thought to be due to the fact that

As a countermeasure to this problem, the thickness of the presser 6 can be increased to make the catch clip 7
It is possible to eliminate the deformation of the presser 6 when the presser 6 is pressed against the flange 5, and also to reduce the deformation when the presser 6 is pressed against the flange 5 by reducing the installation pitch of the catch clip 7. It is conceivable to make it smaller. However, in the former case, the gap between the presser 6 and the lens 9 becomes smaller, and the resistance of the cooling circuit for the lamp cooling air that passes through this gap and is discharged to the outside increases, resulting in an increase in the cooling effect of the electrodeless lamp 1. At the same time, the light distribution may be hindered by the thickness of the presser 6.
In the latter case, the number of attached catch clips 7 will increase, which will worsen the workability of attaching and detaching the mesh 3, and will also make it structurally difficult to attach the catch clips 7, especially on the side where the waveguide 10 is joined, where discharge is likely to occur. Therefore, in this part, the presser 6 and the peripheral edge of the mesh 3 had to be screwed to the flange 5, making the workability for attaching and detaching the mesh 3 even worse.

The present invention has been made in consideration of the above, and the present invention has been developed in such a way that the cooling effect and light distribution of the electrodeless lamp 1 are not hindered, and the workability of attaching and detaching the mesh 3 is not deteriorated. To provide a microwave discharge light source device which can prevent electric discharge between a flange part 5 of a lamp 2 and a mesh 3, thereby preventing flickering of an electrodeless lamp 1 and damage to the mesh 3. With the goal.

Embodiments of the present invention will be described below with reference to the drawings.
3 and 4 are enlarged sectional views of essential parts of the microwave discharge light source device according to this embodiment. FIG. 3 shows a portion with a catch clip 7, and FIG. 4 shows a portion without a catch clip 7. In the figure, 31 is the peripheral edge of the mesh 3; the peripheral edge 31
is pressed between the presser 6 and the flange portion 5 by the pressing force of the catch clip 7, as described above. Reference numeral 61 indicates a length of 5 mm that extends integrally with the outer edge of the presser 6 and is bent at 90 degrees toward the microwave cavity main body 2 side.
This is the bent part. In this case, the inner edge of the presser 6 coincides with the inner edge of the flange portion 5, and the inner edge of the bent portion 61 coincides with the outer edge of the mesh 3 and the outer edge of the flange portion 5. Further, the mounting pitches of the catch clips 7 are equally spaced at 120 degrees as in the conventional case, and the other configurations are also the same as in the conventional case.

In the above device, the catch clip 7 applies an abutting force to the presser 6, and this applies a force to the presser 6 that tends to deform it. However, since the presser 6 has a bent portion 61 extending on its outer edge, its mechanical strength is increased and it can sufficiently withstand the above deformation force, so that no deformation occurs. Therefore, the peripheral edge 31 of the mesh 3
receives the pressing force from the presser 6 to the flange portion 5 over the entire circumference, and no gap is created between the peripheral edge portion 31 of the mesh 3 and the flange portion 5. Therefore, electric discharge between the peripheral portion 31 and the flange portion 5 can be sufficiently prevented.

In the above embodiment, the bent portion 61 bent by 90° toward the flange portion 5 was formed on the outer edge of the presser 6.
The bent portion 61 may be bent at the outer edge of the presser 6 in the opposite direction to the flange portion 5, or may be bent at the inner edge of the presser 6 in the opposite direction to the flange portion 5. It may be provided at the same time on the outer edge and inner edge of.

As described above, in the microwave discharge light source device of the present invention, the outer edge and/or the inner edge of the holding tool which presses the peripheral edge of the metal net against the peripheral edge of the microwave cavity main body by the pressure contact force from the pressing tool. A bent portion is provided in which the presser is integrally bent, thereby increasing the mechanical strength of the presser and preventing the presser from being deformed by the pressing force from the presser. Therefore, there is no gap between the periphery of the metal net and the periphery of the microwave cavity body, and no discharge occurs between them, causing flickering of the electrodeless lamp and damage to the metal net. do not have. In addition, since it does not increase the thickness of the holding tool or reduce the installation pitch of the pressure-welding tool, it does not reduce the cooling effect of the electrodeless lamp or interfere with light distribution, making it easier to attach and remove the metal mesh. Sex doesn't get worse.

[Brief explanation of drawings]

1 and 2 are a vertical side view and a plan view, respectively, of a conventional microwave discharge light source device, and FIGS. 3 and 4 are enlarged sectional views of main parts of a microwave discharge light source device according to the present invention. Figure 3 shows the part with the catch clip, and Figure 4 shows the part without the catch clip. 1... Electrodeless lamp, 2... Microwave cavity body, 3... Metal mesh, 4... Microwave cavity,
5... Flange portion, 6... Holder, 7... Catch clip, 31... Periphery of metal net, 61
...The bent part of the presser foot. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A concave microwave cavity body, which covers the opening of the microwave cavity body and has one side of the periphery abutted against the periphery of the opening; A metal net that cooperates with the main body to form a microwave cavity, an annular presser whose one side is in contact with the other surface of the peripheral edge of the metal net, and a metal net through the presser. A pressure contact tool that presses the peripheral edge of the body against the peripheral edge of the opening of the microwave cavity main body, and an electrodeless device that is disposed inside the microwave cavity and discharges electricity by the microwave energy supplied into the microwave cavity. What is claimed is: 1. A microwave discharge light source device comprising a lamp, characterized in that a bending portion is provided integrally at an outer edge and/or an inner edge of a presser. (2) The microwave discharge light source device according to claim 1, wherein the bent portion of the presser is bent from the outer edge of the presser toward the microwave cavity main body.