JP3105900U - Electrodeless lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodeless lamp device which stabilizes light output and can be used for blinking.
SOLUTION: In an electrodeless lamp device for exciting an electrodeless lamp with microwaves to emit light, a waveguide 6 for transmitting microwaves generated by a magnetron 7 and a microwave transmitted from the waveguide 6 are used. The microwave resonator 2 that resonates and generates an electric field is integrally formed.
Also, the tip 8a of the magnetron output antenna of the electrodeless lamp device is characterized in that it has a hemispherical shape made of a ceramic material containing 92% by weight or more of alumina.
[Selection] Figure 2

Description

  The present invention relates to an electrodeless lamp device that emits light by exciting an electrodeless lamp with microwaves, and more particularly, to a high-output electrodeless lamp device.

  In general, an electrodeless lamp device excites an electrodeless lamp with microwaves to emit light, and includes, as main components, an electrodeless lamp, a microwave resonator, a condenser mirror, and a waveguide. , A magnetron. The component waveguide and the microwave resonator are formed separately from each other, and both are joined by screws or the like.

  Among the above components, the magnetron includes a magnetron output antenna unit for radiating microwaves generated by the magnetron to the outside. The magnetron output antenna section is a hollow ceramic tube mainly composed of alumina. This alumina is white or ivory and has the property of being easily stained. For this reason, the ceramic constituting the magnetron output antenna section is made of an alumina material which has been colored in advance by mixing iron oxide or the like in order to make dirt less noticeable.

When the magnetron output antenna unit is used at a high output, the temperature of the magnetron output antenna unit may rise sharply, causing thermal strain and causing breakage. This breakage of the magnetron output antenna section occurs remarkably when starting up the electrodeless lamp. The cause of the damage is that when starting up the electrodeless lamp, the emitted microwave is not absorbed by the electrodeless lamp because the luminescent material enclosed in the electrodeless lamp is not sufficiently vaporized. This is because the reflected wave returns to the magnetron output antenna unit, and the magnetron output antenna unit is self-heated by the reflected wave. Therefore, conventionally, in order to prevent damage to the magnetron output antenna unit, the electrodeless lamp is turned on even when light from the electrodeless lamp device is not irradiated on the work or the like, and the light emitting medium is constantly vaporized, or the magnetron is driven. An electrodeless lamp device has been developed in which the generation of a reflected wave is controlled by providing a soft start means for gradually increasing the electric power (for example, see Patent Document 1).
JP-A-2003-68490 (paragraphs 0016 to 0017, 0023, FIGS. 1 and 3)

  However, the fact that the conventional electrodeless lamp device molds the waveguide and the microwave resonator separately from each other causes variations in the light output of each electrodeless lamp device and a decrease in the light output over time. It turned out to be the cause. It is presumed that these phenomena occur because the junction between the waveguide and the microwave resonator is discharged by a microwave electric field, or microwave leakage occurs and microwave energy is lost. The variation in the light output of each of the electrodeless lamp devices and the decrease in the light output with time become remarkable in the case of the electrodeless lamp device having a large output.

  On the other hand, a conventional electrodeless lamp device that constantly vaporizes a luminous medium in order to prevent damage to the magnetron output antenna unit is contrary to energy saving use because the electrodeless lamp is turned on even when light is not irradiated on a work or the like. In addition, the conventional electrodeless lamp device including the soft start means for gradually increasing the power for driving the magnetron has a complicated control mechanism because a separate magnetron drive control circuit is provided.

  Further, the rapid rise in temperature of the magnetron output antenna portion generated in the conventional electrodeless lamp device occurs because iron oxide and the like mixed for coloring into the ceramic constituting the magnetron output antenna portion generate heat by microwaves. It has been found.

  Therefore, an object of the present invention is to solve the above-mentioned problems, stabilize the light output, and provide an electrodeless lamp device that can be used for blinking.

  In order to solve the above problem, according to the invention of claim 1, in an electrodeless lamp device that excites and emits an electrodeless lamp with microwaves, a magnetron that generates microwaves and transmits the microwaves generated by the magnetrons A housing consisting of a waveguide that generates a microwave and a microwave resonator that resonates the microwave transmitted from the waveguide to generate an electric field, and the luminescent material absorbs the electric field generated by the microwave resonator. An electrodeless lamp that emits light, and a condensing mirror that reflects and condenses the light generated by the electrodeless lamp, are integrally formed with the housing.

  In the invention according to claim 2, the tip of the magnetron output antenna made of a ceramic material containing 92% by weight or more of alumina is formed in a hemispherical shape.

  According to the first aspect of the present invention, since the variation in the light output of each electrodeless lamp device and the decrease in the light output over time can be reduced, the light output can be stabilized.

  According to the second aspect of the present invention, since the magnetron output antenna can be prevented from being damaged when the electrodeless lamp device is started, the electrodeless lamp device can be used by blinking.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a sectional view of the electrodeless lamp device according to the present invention.

  As shown in FIG. 1, the electrodeless lamp device of the present embodiment includes an electrodeless lamp 1, a microwave resonator 2, a condenser mirror 5, waveguides 6, 6, magnetrons 7, 7, and A cooling fan 9 and antennas 12 and 12 are provided.

  The electrodeless lamp 1 is a cylindrical glass tube formed of quartz or the like, in which a light emitting material such as mercury is sealed, and is fixed in the microwave resonator 2. The microwave resonator 2 has a box shape formed of aluminum and includes a cavity wall 3 opened on the light irradiation side and a microwave reflection mesh 4 provided on an opening surface 2a of the cavity wall 3. Have been.

  The condenser mirror 5 is a half-split cylindrical concave mirror having a semi-elliptical cross section, and is formed of hard glass that transmits microwaves. The condenser mirror 5 reflects and condenses the light generated by the electrodeless lamp 1, and arranges the light in the microwave resonator 2 so as to guide the light to the opening surface 2a of the microwave resonator. Is established.

  The waveguides 6 and 6 are hollow tubes formed of aluminum. The waveguides 6 and 6 are joined at one end 6a of the waveguide and a closed surface 2b of the microwave resonator through an antenna through hole 13 described later. In order to prevent the discharge of microwave electric fields generated at the junction between the waveguides 6 and 6 and the microwave resonator 2 or the leakage of microwaves, the waveguides 6 and 6 and the microwave resonator 2 are prevented from leaking. 2 is continuously and integrally formed.

  The magnetrons 7 and 7 include magnetron output antenna units 8 and 8 for radiating microwaves generated by the magnetron to the waveguides 6 and 6. The magnetrons 7, 7 are fixed with magnetron output antennas 8, 8 inserted into the other ends 6b, 6b of the waveguide.

  The magnetron output antenna section 8 is a hollow tube formed of ceramic, and the tip 8a is formed in a hemispherical shape. The magnetron output antenna section 8 includes an antenna lead (not shown) therein and extends on one side of the magnetron 7. The ceramic for forming the magnetron output antenna section 8 is a ceramic material containing 92% by weight or more of alumina. Since the ceramic material can reduce the dielectric loss of the ceramic by setting the alumina content to 92% by weight or more, it is possible to suppress a rapid rise in the temperature of the magnetron output antenna unit 8 which occurs when the lamp is started. In addition, since the tip 8a of the magnetron output antenna has a hemispherical shape, concentration of stress can be prevented, and breakage of the ceramic portion due to distortion caused by heating can be prevented. As a result, blinking use of the electrodeless lamp device becomes possible.

  The cooling fan 9 is provided above the waveguides 6 and 6. The ventilation holes 10 and the lamp cooling nozzles 11 have ventilation holes 10 formed in the waveguides 6 and 6 so that the cooling air sent from the cooling fan 9 is blown to the surface of the electrodeless lamp 1. A nozzle 11 is provided so as to penetrate the closed surface 2 b of the microwave resonator and the concave portion of the light collecting mirror 5.

  Antennas 12, 12 for radiating microwaves to the microwave resonator 2 extend from the ends 6a, 6a of the waveguide to the microwave resonator 2. The antennas 12 and 12 are partially arranged in parallel with the electrodeless lamp 1 and the condenser mirror 5, one end of which is connected to the cavity wall 3, and the other end of which passes through the antenna through holes 13 and 14. It is fixed in the waveguides 6,6. In addition, it is also possible to configure so that the antenna 12 is not provided. Each component described above is housed in the lamp 15.

  In the electrodeless lamp device configured as described above, the microwave generated by the magnetron 7 is radiated from the magnetron output antenna unit 8 to the waveguide 6. The microwave radiated to the waveguide 6 propagates through the waveguide 6 and is radiated from the antenna 12 to the microwave resonator 2. The microwave radiated from the antenna 12 is reflected by the microwave resonator 2 and excites mercury and the like sealed in the electrodeless lamp 1 to generate plasma. When plasma is generated in the electrodeless lamp 1, light including ultraviolet rays is emitted from the electrodeless lamp 1. This light is reflected by the condenser mirror 5 and is focused on the condenser surface FP (see FIG. 2) below the opening surface 2a of the microwave resonator.

FIG. 2 is a cross-sectional view of the electrodeless lamp device as viewed from a perspective direction along the line AA in FIG. As described above, the waveguide 6 and the microwave resonator 2 are continuously and integrally formed at one end 6a of the waveguide and the closing surface 2b opposite to the opening surface 2a of the microwave resonator. For example, it is integrally molded by aluminum casting. By integrally molding as described above, it is possible to prevent the discharge of the microwave electric field or the leakage of the microwave generated at the junction between the waveguide 6 and the microwave resonator 2. As a result, it is possible to reduce variations in the light output of each electrodeless lamp device and a decrease in the light output over time, thereby stabilizing the light output.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, in the present embodiment, the waveguide 6 and the microwave resonator 2 are integrally molded by aluminum casting. However, the material is not limited to aluminum, and a material that reflects microwaves is applied. Can be. Further, the manufacturing method is not limited to casting, and for example, press working can be applied.

FIG. 3 is a sectional view of the electrodeless lamp device according to the present invention. It is sectional drawing of the electrodeless lamp apparatus seen from the AA line perspective direction of FIG.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Electrodeless lamp 2 Microwave resonator 3 Cavity wall 4 Microwave reflection mesh 5 Condensing mirror 6 Waveguide 7 Magnetron 8 Magnetron output antenna part 9 Cooling fan 10 Vent hole 11 Lamp cooling nozzle 12 Antenna 13, 14 Antenna penetration Hole 15 lamp

Claims (2)

In an electrodeless lamp device that excites an electrodeless lamp with microwaves and emits light,
A magnetron that generates microwaves,
A housing comprising a waveguide that transmits microwaves generated by the magnetron and a microwave resonator that resonates the microwaves transmitted from the waveguides to generate an electric field;
An electrodeless lamp that emits light by absorbing the electric field generated by the microwave resonator by a luminescent material,
And a condenser mirror for reflecting and condensing light generated by the electrodeless lamp,
An electrodeless lamp device, wherein the housing integrally forms the waveguide and the microwave resonator. 2. The electrodeless lamp device according to claim 1, wherein the tip of the magnetron output antenna made of a ceramic material containing 92% by weight or more of alumina has a hemispherical shape.

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