JPH027351A - Electrodeless discharge lamp - Google Patents

Abstract

PURPOSE:To make it possible to make its light source portion relatively small, and intensity its light output in its transverse direction, by dividing into two and ring-shapedly disposing induction coils in the respective upper and lower portions of its valve, and also disposing the divided upper coils and the connecting portion of the lower portion in the hollow portion of the bulb. CONSTITUTION:A bulb 10 airtightly formed from light transmitting materials is made in a troidal form having a hollow provided in its center, the outer form of which bulb is rough-cylindrical, and into which are sealed rare gases of argon and the like as electric-discharge gas material or metal like mercury, etc., added to the rare gases. And, a series of induction coils 11 disposed along the outer wall face of the bulb 10 are divided in the upper and lower portions of the bulb 10 so as to ring-shapedly dispose each of the divided coils therein, and also the divided upper coils 11 (a) and the connecting portion 11 (c) of the lower portion 11 (c) are respectively disposed in the hollow portion of the bulb. Thus the induction coils 11 being divided and disposed in the respective upper and lower portions, its light output can effectively be utilized without cutting off light travelling in its transverse direction, and also its light source portion can be made comparatively small.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrodeless discharge lamp that does not have electrodes inside the lamp and discharges and emits a rare gas or metal vapor inside the lamp using a high-frequency electromagnetic field from the outside. .

[Prior Art] This type of lamp has been known in the past, for example, the lamp disclosed in Japanese Patent Application Laid-Open No. 57-78766,
As shown in Fig. 5, a bulb 2 is formed to cover an air-core coil l, and the mercury vapor inside the bulb 2 is discharged by the electromagnetic field generated by passing a high-frequency current through the air-core coil l. , the magnetic field due to the cylindrical coil used here is
Although it is the strongest inside, in this example, there is no discharge space in that part, and the bulb 2 is formed by exclusively utilizing the magnetic field outside the coil.

In order to achieve tight energy coupling between the high-frequency generator and the lamp, it is best to place the bulb inside the coil. This will prevent the radiation from being emitted effectively.

Further, in the lamp disclosed in Japanese Utility Model Application Publication No. 61-71957, as shown in FIG. The light output in the direction in which the coil 3 and the coil 3 are connected will be blocked.

[Problem to be solved by the invention] By the way, when light output is required in the lateral direction, such as in the case of aircraft obstacle lights that are required to be installed in high-rise buildings, etc., the light output as shown in Fig. 6 above is used. Lamps do not provide sufficient lateral light, and the lamp shown in Figure 5 has a coil inside it, making the light source large. There was a problem that it became difficult to obtain a light distribution.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an electrodeless discharge lamp having a relatively small light source portion and a large lateral light output.

[Means for Solving the Problems] In order to solve the above-mentioned problems, an electrodeless discharge lamp according to the present invention includes a toroidal-shaped bulb having a cylindrical hollow in the center and having a cylindrical hollow space in the center; In an electrodeless discharge lamp comprising a high-frequency electromagnetic field induction coil arranged along the outer wall surface, the induction coil is divided into two parts, an upper part and a lower part of the bulb, and each part is arranged in a ring shape, The device is characterized in that the divided upper coil and lower connecting portion are disposed in the hollow portion.

[Example] Figures 1 to 3 show an example of the present invention.
0 is a bulb made of a light-transmitting material in an airtight manner, and its shape is a toroidal shape with a cylindrical hollow in the center, and its outer shape is approximately cylindrical. A rare gas or a metal such as mercury is sealed in addition to the rare gas. Reference numeral 11 denotes a series of induction coils arranged along the outer wall surface of the valve 10, which are divided into two parts, an upper part and a lower part of the valve 10, each arranged in a ring shape. The connecting portion 11C of the lower portion 11b penetrates the hollow portion. coil 11
Both ends are connected to a high frequency generation circuit (not shown).

In this embodiment, a copper wire with a diameter of 111111 is used for the induction coil 11, but it may be thicker or thinner than this, and conductive materials other than copper may also be used. A phosphor may be applied depending on the requirements. Furthermore, the shape of the bulb 10 is not limited to a cylindrical shape, and may be, for example, a spherical shape.

Induction coil 1 of the electrodeless discharge lamp configured in this way
When a high frequency current is applied to the pulp 10, an electromagnetic field is induced, and the discharge gas within the pulp 10 is excited and ionized. that time,
Obtain visible light directly by excitation emission or use a bulb
The ultraviolet light generated by discharge excitation is converted into visible light by a phosphor coated on the inner wall surface of the O and used. induction coil 11
Since they are arranged vertically, the light output can be used effectively without blocking the light in the lateral direction.

FIG. 4 shows an example of the application of the electrodeless discharge lamp according to the present invention, which is used in the above-mentioned aircraft obstruction lamp, and is effective in a lamp that requires light output in the lateral direction. Note that 12 in the figure is a high frequency generation circuit.

[Effects of the Invention] As described above, the present invention includes a toroidal-shaped bulb in which a discharge gas is sealed and has a cylindrical hollow in the center, and a high-frequency electromagnetic field disposed along the outer wall surface of the bulb. In an electrodeless discharge lamp comprising an induction coil, the induction coil is divided into two parts, an upper part and a lower part of the bulb, each arranged in a ring shape, and a connection part between the divided upper coil and the lower part is connected to the hollow part. Therefore, according to the present invention, it is possible to provide an electrodeless discharge lamp that can effectively extract light in the lateral direction of the lamp and has a relatively small light source section.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a sectional view of the same as above, Fig. 3 is a perspective view of an induction coil used in the above embodiment, and Fig. 4 is an electrodeless discharge according to the present invention. FIGS. 5 and 6 are partially sectional front views illustrating usage examples of the lamp, and FIGS. 5 and 6 respectively show conventional examples. 5th 1 is a partially sectional front view, and FIG. 6 is a perspective view 1. 10... Valve, 11... Induction coil.

Claims (1)

[Claims] (1) In an electrodeless discharge lamp consisting of a toroidal bulb with a cylindrical hollow in the center and a toroidal bulb filled with a gas to be discharged, and a high-frequency electromagnetic field induction coil arranged along the outer wall of the bulb. , the induction coil is divided into two parts, an upper part and a lower part of the valve, and arranged in a ring shape, and a connecting part between the divided upper coil and the lower part is arranged in the hollow part. Electrodeless discharge lamp.