JPS60117539A - Electrode-less discharge lamp - Google Patents

Abstract

PURPOSE:To easily prevent radio interference by arranging an oscillator within a reflection shield provided to the internal cavity of cylindrical body consisting of an insulation material and by also arranging a sealed case for light emission at the upper part. CONSTITUTION:A reflection shield plate 16 is provided to the internal cavity 12 of a cylindrical body 11 made of an insulation material 11 and a high frequency oscillator 15 having an induction coil 14 is also arranged in said plate. The upper part of oscillator 15 is filled with metal vapor such as silver, etc. and anactive gas and a transmissive sealed case 17 loading a phosphor material 18 and mesh 19 for preventing radio interference is arranged at the upper part 17a, thereby forming an electrode-less discharge lamp. An induced magnetic field is generated in the coil 14 with the oscillator 15, moreover electric field is also generated, it is then guided to the case 17 through the reflection shield 16 for emission of light. Accordingly, loading of mesh 19 can be done easily and cooling effect can be enhanced by an air hole 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a discharge lamp that utilizes high frequency electrodeless discharge.

[Background technology]

General white #! Ichi: Bulbs are widely used, but they have the drawbacks of relatively low efficiency, 10 to 151 m2 per watt of input, and a short lifespan of about 1,000 hours and 1,711 hours. Compared to incandescent light bulbs, small regular fluorescent lamps are more energy efficient and have a longer lifespan of about 4,000 hours, so small fluorescent lamps with Edison metal are now being used in many places as an alternative to regular incandescent light bulbs. It is developed in With the same aim, research and development in various places is also underway on electrodeless discharge lamps designed for general lighting, which do not use electrodes, have a significantly longer lifespan, and can be made more compact.

FIG. 1 shows an example of the above-mentioned electrodeless discharge lamp.
An incandescent bulb-shaped bulb 2 coated with Radio frequency oscillation 11 in which metal vapor and inert such as argon excite 74
It consists of g s. Reference numeral 6 is an induction coil for 1st oscillation Hg s, 7 is an insulating mandrel forming an air-core coil, 8 is a radio frequency oscillator main body, and 9 is an Edison metal that can be attached to an incandescent lamp socket.

This electrodeless discharge lamp generates an induced magnetic field in a coil 6 using a radio frequency generated by an oscillator 5, and further induces an electric field. As a result, metal vapor such as mercury in the pulp 2 is ionized, and the emitted ultraviolet light excites the fluorescent material 1 so that the pulp 2 generates white light. However, in this electrodeless discharge lamp, some of the magnetic field generated by the coil 6 does not combine with the excited gas and goes outside the bulb 2, causing a large amount of noise such as radio noise to the outside of the lamp. The sky is full of light. In order to prevent this, a mesh 10 is attached to the inner surface of the pulp 2, as shown in FIG. 1, to shield the high frequency electromagnetic field from the coil 6, thereby preventing the occurrence of radio interference. However, this mesh lO needs to be coated on the entire inner surface of the pulp 2, which is not easy from a manufacturing standpoint.
This is the lack and depression of this wamp.

Furthermore, according to such a JLLI TFI polar radiation lamp, the temperature inside the pulp 2 rises significantly during lighting, placing a large burden on the oscillator and insulating mandrel. The crystallinity of the crystals also increases excessively, which has a negative effect on the emission properties and is one of the causes of deterioration.

In this way, pulp 2 is white! The electrodeless discharge lamp is formed in the shape of "S k bk" and has an oscillator 5 installed inside the pulp 2 to emit light from the entire pulp 2, similar to an incandescent light bulb. , it is difficult to apply mesh IO, and it also has drawbacks such as component deterioration and characteristic changes due to temperature rise within the pulp 2.

[Purpose of the invention]

The present invention was made in view of the above-mentioned drawbacks, and its purpose is to facilitate the installation of a mesh for preventing radio wave interference.
Furthermore, the present invention provides a small-sized electroless IMi dissipator that does not suffer from component deterioration or characteristic deterioration due to temperature rise.

[Disclosure of the invention]

The present invention will be explained below based on an embodiment shown in FIG.

In this electrodeless discharge lamp, an insulating mandrel I3 and an induction coil 14 are installed in a cavity part 1111 of a cylindrical body made of an insulating material, and an oscillator 15 is provided in the cavity part 12.
The wall surface of the cylindrical body 11 is covered with a foul shield plate 1.
Covered by 6. Further, a truncated cone-shaped translucent airtight container 17 is formed above the oscillator 15, and the container 17 is filled with metal vapor containing mercury and an inert gas.
A phosphor material 18 is adhered to the inner wall of the upper surface 17a of 317, and a mesh 19 for preventing radio wave interference is attached thereon. Further, the cavity communicates with the space outside the lamp through cooling holes 21 provided in the support Δ. In addition,
In the figure, n is an oscillator body equipped with a tuning circuit such as a capacitor, and z3 is an Edison metal similar to an incandescent lamp base.

Thus, the λ1 (electrode discharge lamp generates an induced magnetic field ↑ in the induction coil 14 at a radio frequency by the oscillator 15, and further generates an electric field. This electric field generates an oscillation i (# I
However, since the oscillator] 5 is surrounded by a reflective shield plate 16 through the sky 11N sound jI 12 as shown above, the field Ya and field are It will move upwards. And this electric field is
Airtight? The ultraviolet rays that pass through the lower surface 17b of 17 and ionize and emit the metal vapor such as mercury sealed in 17,
White light is emitted through the soil surface 1.7a of the container equipped with the 9.

In addition, the lower surface 17b of the above-mentioned nine-fold container 17 is as described above)
Instead of being made of 11-sided glass, it may be made into a lens shape. In such a case, by appropriately designing the lens, it is possible to obtain a light distribution of 9Z. Also, is the mesh 19 attached to the surface 17aVC on the container? r Lower surface 17
b(/(- may be provided.

〔Effect of the invention〕

As described above, the present invention generates a high frequency electromagnetic field using a high frequency oscillation coil such as the induction filter 14, and uses this high frequency magnetic field to generate the metal 1. In the +1 lamp, the circumference 11111 of the high frequency oscillation coil 14 is passed through the hollow part 12 to the reflection shield plate I6 having an opening at the upper end.
At the same time, the lower surface 17b of the airtight container 17 is brought into contact with the upper opening edge of the shield plate 16, and the upper surface 17a of the container is
is used as a light emitting surface, and by providing a mesh 19 for preventing radio wave interference on the upper surface 17a or lower surface 17b of the container 17, it is possible to easily attach the mesh and obtain a compact electrodeless discharge lamp. Since the second cavity communicates with the outside of the lamp through the air hole 21, the cooling effect is large, and deterioration of components such as the high frequency oscillation coil 14 due to the temperature rise of the high frequency oscillator 15 can be reduced. Further, since the cavity portion and the airtight container 17 have only one surface in contact with each other, an increase in the temperature of the metal vapor in the container 17 due to a temperature increase in the oscillator 15 is suppressed, and the discharge characteristics are stabilized.

[Brief explanation of drawings]

Figure 1 is a front view of only the valve section according to the conventional example;
The figure is a partially cutaway front view showing one embodiment of the present invention. I2...Cavity part, 14...High frequency oscillation coil, 15
...High frequency oscillator, 16...Reflection shield plate, 17
... Airtight container, 18... Fluorescent line 1.19... Metsch, 21... Air hole. Patent Applicant Matsu'Flf Ko Co., Ltd. Representative Patent Attorney Toshimaru Takeyo (and 2 others) 1st 2nd Ami 18 \- 14' 3 5 1 16 21 21

Claims (1)

[Claims] (1) A translucent airtight container filled with a metal and an inert gas that emit light when their vapor is excited by a high-frequency electromagnetic field;
The electrodeless discharge lamp Ic includes a high-frequency oscillation coil made of a coil body that generates a high-frequency electromagnetic field outside the airtight container, and a high-frequency oscillator that applies a high-frequency current to the high-frequency oscillation coil. The circumferential side of the airtight container is covered with a radiant shield plate having an opening at the upper end via the cavity, and the lower surface of the airtight container is brought into contact with the upper opening edge of the shield plate, and the upper surface of the container is used as a light emitting surface. In addition, an electrodeless discharge lamp characterized in that a mesh is provided on the upper or lower surface of the container, and the cavity is opened to the outside through an air hole.