JPS5816459A - High frequency discharge light source unit - Google Patents

Abstract

PURPOSE:To obtain various luminous intensity distributions by arranging an electrodeless discharge lamp in a cavity resonator formed with a member which passes light through its wall face but reflects microwaves and by feeding microwaves into the cavity in two uniform parts. CONSTITUTION:An annular electrodeless fluorescent lamp 1 is arranged in a bottomed cylindrical cavity resonator 4 formed with a light transparent body 3 made of a metal mesh which passes light through its wall but reflects microwaves, and a divider 9 dividing microwaves into two uniform parts is fitted on the cavity resonator 4. Microwaves excited by an oscillator 5 are divided by the divider 9 into two uniform parts, which are applied with a phase difference of 180 deg. between them, and are fed into the cavity 4 through coupling holes 7 to discharge the fluorescent lamp 1. Therefore, by providing light reflectors with different shapes outside the cavity 4, various luminous intensity distributions can be available without affecting resonance frequencies.

Description

Detailed Description of the Invention The present invention relates to a high frequency discharge light source device for lighting an electrodeless discharge lamp using high frequency energy within a high frequency cavity. The high-frequency discharge light source device shown in FIG. 1 has been proposed. In other words, microwaves generated by a microwave oscillator (5) are passed through a coupling hole (7).

A light reflecting plate (2) that reflects microwaves and light, and a light transmitting body (3) made of a metal net that covers the opening flt of this light reflecting plate (2) and reflects the microwave but substantially allows the light to pass through.
A spherical electrodeless warning light (1) disposed within the cavity resonator (4) is transmitted within the microwave electromagnetic field. It lights up. In addition, (8) is a phosphor film applied to the inner surface of the spherical electrodeless warning light Tl), and (6) is a microwave oscillator (5).
) It is an electric power cable for supplying K electric power. In the high frequency discharge light source device configured in this way, a fluorescent lamp (1
) is emitted to the outside of the cavity resonator (4) directly or through the light transmitting member 13)'fr after being reflected by the light reflecting plate (2).

Therefore, this kind of microwave radiation 1! A light source device using a discharge lamp has useful features such as a long life without deterioration due to electrode wear because it does not require electrodes in the discharge lamp, but its light distribution is similar to that of a cavity resonator (4). It is determined by the shape of the reflective plate (2), which also serves as a wall, and the fluorescent light (1).

Therefore, in order to obtain illumination with a different light distribution, it is necessary to change the shape of the reflector (2), but in this case, it is also necessary to simultaneously satisfy the conditions for the cavity resonator (41). The process of finding these conditions involves a lot of trial and error, but it is easy to determine the shape of the reflector (2) that satisfies the light distribution conditions and at the same time satisfies the conditions for the cavity resonator (4). There was a drawback that I couldn't get it.

It is an object of the present invention to provide a high frequency discharge light source device which eliminates the above-mentioned drawbacks by constructing all the walls of the cavity resonator except for the joint part with the waveguide with a light-transmitting member such as a metal mesh. It is something. An embodiment of the present invention will be explained below with reference to FIGS. 2 and 3.

FIG. 2 is a broken sectional view showing an embodiment of the present invention. In the figure, (4) is a cylindrical cavity resonator.

This cavity resonator (4) acts as a waveguide, and a metal waveguide plate is used to attach a distributor (9) that equally divides the microwave power IJi-2 to the cavity resonator (4)K. Attachment is plate 11 (I, and this attachment 9 is a light transmitting body (3) consisting of a bottomed cylindrical metal mesh attached to the bottom surface of the plate opening.
It is composed of K. In addition, (ri is an annular fluorescent lamp with a circular cross section, 61 is a 180 degree phase shifter, and the six wheels are a fluorescent lamp (1
) is a support rod.

The high-frequency discharge light source device having the above configuration uses one oscillator (lead-excited microwaves are divided into two by a distributor (91), and then divided by a 180 degree phase shifter 621 between the two waves. A phase difference of Ktso degrees is given.Thus, the resonator (4) is excited through the coupling hole (7) with two waves having a positive amplitude and an opposite phase relationship.

Therefore, if the height and diameter of the cavity resonator (4) are set appropriately, it is possible to excite a mode wave as shown in FIG. 3 within the cavity resonator (4). The broken lines in FIG. 3 indicate lines of magnetic force excited by the coupling hole (7).

Moreover, the solid lines each schematically show the state of the electric lines of force perpendicular to the lines of magnetic force.

In the high-frequency discharge light source device having the above configuration, the annular fluorescent lamp (1) disposed within the cavity resonator (4) is discharge-excited by the microwave AM field, and is different from a conventional electrodeless lamp. Similarly, it emits visible light. Of the light generated in this way, -S is reflected by the waveguide mounting plate O, and most of the other light directly passes through the light transmitting body (6) and enters the cavity resonator (4).
) is radiated outward. Therefore, if a light reflecting plate (omitted in the drawing) is provided outside the cavity resonator (4), by changing the shape of the light reflecting plate, the cavity resonator (4)
The light distribution can be changed without affecting the resonant frequency of the lamp, and various light distributions can be obtained easily. In order to turn on the metal mesh and to avoid as much as possible heating of the metal mesh due to the current flowing through the metal mesh, a mode wave as shown in Fig. 3 is excited within the cavity resonator (4%), and the cavity resonator (4) is The waveguide mounting plate is used as a light reflecting plate in the same way as in conventional lighting fixtures for circular fluorescent lamps, but the discharge lamp is made spherical to obtain more precise light distribution. If you are trying to do this, use a normal single-circuit waveguide instead of a 9-distribution type waveguide, and use a cavity resonator (41) to empty the light other than that directly irradiated to the junction surface with the waveguide. Body resonator (4
) It is also possible to control using an external light reflecting plate.

As explained above, according to the present invention, all the walls except the junction W& of the cavity resonator with the waveguide (consisting of members that allow light to pass through but reflect microwaves), This has the effect that it is possible to provide a high frequency discharge light source device ti in which the light distribution can be easily changed by a light reflecting plate provided outside the cavity.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view showing a high-frequency discharge light source device that has already been proposed, and Fig. 2 is a cutaway side view of a high-frequency discharge light source device showing an embodiment of the present invention. **Figure S is an embodiment of Jin's invention. It is an electromagnetic field distribution diagram in an example. In the figure, (1) is an electrodeless lamp, (2) is a light reflecting plate, and (3
) is a light transmitting body, (4) is a cavity resonator, (7) is a coupling hole,
(9) is a distributor, (1 (I is a waveguide mounting plate, and aD is a phase shift i. In addition, the same reference numerals are given to the same or phase @ part in Figure 9. Agent Makoto Kuzuno -

Claims (1)

[Claims] A high-frequency cavity resonator, in which all walls except the connection with the waveguide are made of materials that allow light to pass through but reflect high-frequency waves, and an electrodeless discharge lamp installed inside this cavity resonator. A microwave discharge light source device comprising: