JPH08264161A - Electrodeless discharge lamp device - Google Patents

Abstract

PURPOSE: To facilitate the luminous intensity distribution control of a lighting system using an outside winding type electrodeless discharge lamp in which an induction coil is externally wound. CONSTITUTION: This is an electrodeless discharge lamp device using an electrodeless discharge lamp in which a high-frequency current is made to flow through an induction coil 24 from a high-frequency power supply 27, which coil is disposed outside a bulb 21 made of a transparent material with a discharge gas filled, and a high-frequency electromagnetic field is made to react to the discharge gas filled in the bulb 21, thereby exciting the discharge gas to emit light. A reflecting plate 26 for controlling the luminous intensity distribution of the electrodeless discharge lamp is provided and at the same time the electrodeless discharge lamp is disposed so that the radiating direction of light from the reflecting plate 26 is made vertical to the axis of the induction coil 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp device which excites and discharges discharge gas by causing a high-frequency electromagnetic field to act on the discharge gas sealed in a bulb.

[0002]

2. Description of the Related Art Conventionally, there is known an electrodeless discharge lamp in which a discharge gas enclosed in a bulb is excited by a high frequency electromagnetic field so as to excite the discharge gas to emit light. Since this type of electrodeless discharge lamp has features such as small size, high output, and long life, research and development have been conducted in various places, and electrodeless discharge lamps such as those shown in FIG. 6 have been used. Electrode discharge lamp devices have been commercialized.

In this electrodeless discharge lamp device, an induction coil 2 is wound around the bulb-shaped bulb 1 for several turns, and a 13.56 M output from the high frequency power source 3 is applied to the induction coil 2.
A high-frequency current of Hz is applied, and a high-frequency electromagnetic field is applied to the discharge gas sealed in the bulb 1 to excite the discharge gas to emit light. A discharge gas containing mercury vapor is used, and ultraviolet rays are emitted by the excitation of mercury atoms, which are converted into visible light by a phosphor (not shown) coated on the inner surface of the bulb 1. .
This visible light is reflected directly or by the reflecting plate 4, and is output through the light transmitting plate 5. In the figure, 6 is a device body made of a metal having good conductivity, which also has a function of preventing noise leakage. Further, 7 is an electromagnetic shield means composed of a conductive mesh, which transmits the irradiation light output from the bulb 1 and prevents noise leakage from the transparent plate 5.

Further, in order to improve the startability, an electrodeless discharge lamp as shown in FIG. 7 has been studied (see, for example, Japanese Unexamined Patent Publication No. 5-47355). In this lamp, a rare gas and a metal halide are enclosed as a discharge gas in a bulb 10 formed in a spherical shape by a translucent material such as quartz glass, and a high frequency current output from a first high frequency power supply 11 is supplied. The induction electromagnetic field generated by energizing the induction coil 12 excites the discharge gas in the bulb 10 to emit light, and the starting auxiliary electrode 13 provided on the outer wall surface of the bulb 10 has a second high frequency power supply 14 Is applied with a high frequency voltage, and the electrons accelerated by the high frequency electric field generated around the starting assisting electrode 13 collide with the atoms of the discharge gas and ionize them, thereby generating a string-shaped preliminary discharge, It has good startability.

[0005]

By the way, in such an electrodeless discharge lamp of the outer winding type in which an induction coil is wound outside the bulb, since the light emission inside the bulb is blocked by the induction coil, the direction from this direction is obstructed. The output light is limited,
When used as a light source of a lighting device, there is a problem that light distribution control is difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless discharge lamp device whose light distribution can be easily controlled.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a high-frequency current from a high-frequency power source in an induction coil arranged outside a bulb made of a translucent material in which a discharge gas is sealed. In an electrodeless discharge lamp device using an electrodeless discharge lamp that excites and discharges the discharge gas by applying a high-frequency electromagnetic field to the discharge gas sealed in the bulb. The present invention is characterized in that a reflection plate for controlling light is provided, and an electrodeless discharge lamp is arranged such that a light irradiation direction of the reflection plate and an axis of the induction coil are perpendicular to each other.

The invention according to claim 2 is characterized in that the induction coil is divided into two parts in the vicinity of the center of the valve, and a starting assisting electrode is provided between the two divided coils. According to a third aspect of the invention, the valve is
The internal space is held in a second valve made of a translucent material that has been evacuated to a high vacuum, and is supported by the reflector through the second valve.

[0009]

According to the first aspect of the invention, since the irradiation direction of the reflector for controlling the light distribution and the axis of the induction coil are perpendicular to each other, the light emission inside the bulb is caused by the induction coil. The light reaches the reflector without being blocked, and the light distribution control becomes easy.

According to the second aspect of the present invention, the induction coil is divided into two parts in the vicinity of the center of the valve, and the starting assisting electrode is provided between the two divided coils.
The start-up assisting electrode can be arranged relatively easily.

According to the third aspect of the present invention, the valve (first valve) is held in the second valve whose internal space is evacuated to a high vacuum, and is supported by the reflector through the second valve. Therefore, the position of the bulb with respect to the reflection plate is fixed, which is more preferable in light distribution control and deformation of the induction coil can be suppressed.

[0012]

【Example】

(Embodiment 1) FIG. 1 is a simplified diagram showing a first embodiment according to the present invention. In the figure, reference numeral 21 is a first bulb formed in a spherical shape from a transparent material such as quartz glass,
A rare gas and a metal halide are enclosed as a discharge gas in the inside. As the discharge gas, for example, 300 To
rr xenon gas and 12 mg NaI-TlI-InI
(A mixture of sodium iodide, thallium iodide and indium iodide) is used. The shape of the valve 21 does not have to be spherical, and may be another shape such as a cylindrical shape. Further, the discharge gas to be sealed may use other gas or metal.

Reference numeral 22 is a second bulb made of a translucent material such as quartz glass. The hermetically sealed interior is evacuated to a high vacuum and is constructed so as to surround the first bulb 21. The first valve 21 is fixed via a support body 23 so as to be positioned substantially in the center of the second valve 22.

Reference numeral 24 is an induction coil wound around the outer peripheral wall of the second valve 22, and is wound three turns like a solenoid in the vicinity of where the first valve 21 is located. In addition,
The number of turns of the induction coil 24 is not particularly limited as long as it is wound one turn or more.

Reference numeral 25 is a starting assisting electrode, which is inserted from the outside of the second valve 22 through the support 23, and one end of which is the first
Is in contact with the outer surface of the valve 21.

Reference numeral 26 is a reflector for controlling the light distribution of the electrodeless discharge lamp, and the reflector 2 is provided near the focal point of the first bulb 2.
1 is arranged so that the irradiation direction of the reflection plate 26 and the axis of the induction coil 24 are perpendicular to each other.

Both ends of the induction coil 24 are 13.56 MHz.
Is connected to a first high frequency power source 27 that oscillates at a high frequency. When the first high frequency power source 27 is operated, a high frequency current flows through the induction coil 24, and a high frequency electromagnetic field is generated around the induction coil 24. Has been done. The other end of the starting assistance electrode 25 has a second high frequency power source 2 for generating a high voltage.
8 is connected.

In the electrodeless discharge lamp device constructed as described above, the start-up assisting electrode 2 is driven by the second high frequency power source 28.
When a high voltage is applied to 5, the electrons in the first bulb 21 are accelerated by the electric field generated around the starting assisting electrode 25, collide with the atoms of the discharge gas, and are ionized to generate new electrons. The electrons generated in this way are transferred to the induction coil 24.
Energy is received by the high-frequency electromagnetic field generated around and collides with the discharge gas atoms to give energy. In this way, toroidal discharge plasma is formed in the first bulb 21. Atoms in the discharge plasma are ionized and excited. The excited atom emits light when returning to the ground state. This light emission is used as light energy. After the discharge is maintained by the high-frequency electromagnetic field generated by the induction coil 24, it becomes unnecessary to apply a high voltage to the starting assisting electrode 25.

The light emission thus obtained is reflected by the reflection plate 2
The light distribution is controlled by 6, and the light is emitted from the opening surface to the outside.
Here, as described above, since the irradiation direction by the reflection plate 26 and the axis of the induction coil 24 are arranged to be perpendicular to each other, the light emission from the first bulb 21 is reflected without being blocked by the induction coil 24. The plate 26 is reached, and the light distribution control is facilitated.

(Embodiment 2) FIG. 2 shows a second embodiment according to the present invention. The difference from Embodiment 1 is that the induction coil 24 is divided into two parts near the center of the first valve 21. In addition, since the starting assisting electrode 25 is provided between the two divided coils, the other configuration is the same as that of the first embodiment, and therefore, the description is omitted by assigning the same reference numerals to the same configurations.

With this structure, the light distribution can be controlled easily and the bulb 21 of the starting assisting electrode 25 can be controlled.
Can be installed relatively easily.

(Embodiment 3) FIG. 3 shows a third embodiment according to the present invention. The difference from Embodiment 1 is that the support 2 made of glass member is provided at both longitudinal ends of the second bulb 22.
9 and 29 are provided, and the second bulb 22 is fixed to the reflection plate 26 by the supports 29 and 29. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations. Therefore, the description will be omitted.

According to the present embodiment, the position of the bulb 21 with respect to the reflection plate 26 does not change, which is more preferable in light distribution control, and deformation of the induction coil 24 can be suppressed.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment according to the present invention. The difference from the first embodiment is that a ring-shaped recess 30 is provided at one longitudinal end of the second valve 22. The bulb 22 is fixed to the reflection plate 26 by utilizing the recess 30. The fixing is performed using the support 31 fixed to the reflection plate 26. The support 31 has a ring-shaped support ring 32 at its tip, and the support ring 32 is made of an elastic body such as a spring that expands and contracts in the radial direction.
The valve 22 by fitting it into the recess 30 of the valve 22.
Is fixed. Since other configurations are similar to those of the first embodiment, the same reference numerals are given to the same configurations and the description thereof will be omitted.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment according to the present invention. The difference from the first embodiment is that the second bulb 22 is directly fixed to the reflecting plate 26. The fixing is performed by providing concave portions 33, 33 on the inner surface of the reflecting plate 26 and fitting both longitudinal ends of the second bulb 22 into the concave portions 33, 33. Since other configurations are similar to those of the first embodiment, the same reference numerals are given to the same configurations and the description thereof will be omitted.

[0026]

According to the first aspect of the invention, since the irradiation direction of the reflector for controlling the light distribution and the axis of the induction coil are perpendicular to each other, the light emission in the bulb is induced. It is possible to provide an electrodeless discharge lamp device that reaches the reflecting plate without being blocked by the coil and is easy in light distribution control.

According to the second aspect of the invention, the induction coil is divided into two parts in the vicinity of the center of the valve, and the starting assisting electrode is provided between the two divided coils.
It is possible to provide the electrodeless discharge lamp device in which the starting assisting electrode can be relatively easily arranged and the light distribution can be easily controlled.

According to the third aspect of the invention, the valve (first valve) is held in the second valve whose internal space is evacuated to a high vacuum, and is supported by the reflecting plate through the second valve. Therefore, it is possible to provide the electrodeless discharge lamp device in which the position of the bulb with respect to the reflector is fixed, which is more preferable in the light distribution control, and the light distribution control in which the deformation of the induction coil is suppressed is easy.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment according to the present invention.

FIG. 2 is a schematic diagram showing a second embodiment according to the present invention.

FIG. 3 is a schematic diagram showing a third embodiment according to the present invention.

FIG. 4 is a schematic view showing a fourth embodiment according to the present invention.

FIG. 5 is a schematic view showing a fifth embodiment according to the present invention.

FIG. 6 is a cross-sectional view showing a conventional electrodeless discharge lamp device.

FIG. 7 is a schematic view showing a conventional electrodeless discharge lamp.

[Explanation of symbols]

 21 First Valve 22 Second Valve 23 Support 24 Induction Coil 25 Starting Auxiliary Electrode 26 Reflector 27 First High Frequency Power Supply 28 Second High Frequency Power Supply 29 Support 30 Cavity 31 Support 32 Support Ring 33 Recess

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Anan 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Co., Ltd. (72) Inventor, Shohei Yamada, 1048, Kadoma, Kadoma, Osaka

Claims (3)

[Claims] 1. A high-frequency current is supplied from a high-frequency power source to an induction coil arranged outside a bulb made of a translucent material in which a discharge gas is enclosed, and a high-frequency electromagnetic field is applied to the discharge gas enclosed in the bulb. In an electrodeless discharge lamp device using an electrodeless discharge lamp that excites and discharges the discharge gas by providing a reflection plate for controlling the light distribution of the electrodeless discharge lamp and irradiating light by the reflection plate. An electrodeless discharge lamp device in which an electrodeless discharge lamp is arranged such that a direction thereof is perpendicular to an axis of the induction coil. 2. The induction coil is installed near the center of the valve.
The electrodeless discharge lamp device according to claim 1, wherein the starting auxiliary electrode is provided between the two divided coils while being divided into two parts. 3. The valve is held in a second valve made of a translucent material whose internal space is evacuated to a high vacuum, and is supported by the reflector through the second valve. The electrodeless discharge lamp device according to claim 1 or 2.