JPH0458121B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electrodeless discharge lamp device that lights a lamp made of a light-transmitting airtight container filled with discharge gas by applying a high-frequency electromagnetic field from the outside. .

[Background Art] Generally, discharge lamps are classified into electrode type and electrodeless type based on their structure and method. Electrode type discharge lamps are now widely used along with incandescent light bulbs, and include fluorescent lamps and high-pressure mercury lamps.
FIG. 2 shows the basic structure of a fluorescent lamp as an example of an electrode type. In the figure, 1 is a light-transmitting airtight container made of a glass bulb, and a predetermined amount of discharge gas such as mercury or rare gas is sealed in the airtight space 2 formed by the light-transmitting airtight container. A phosphor 3 is coated on the inner surface of 1, and electrodes 4 filled with a thermionic emission material are provided at both ends. In such a fluorescent lamp, a voltage is applied between the electrodes 4 and 4 by a power source 5 through a current-limiting impedance 6 to cause a discharge, and the ultraviolet rays generated by this discharge are transmitted to the phosphor. 3 to obtain illumination light by converting it into visible light.

Next, a conventional example of an electrodeless type is shown in FIG.
In the figure, reference numeral 7 denotes a translucent airtight container, the inside of which is sealed with a predetermined amount of mercury and a rare gas, and the inner surface of the airtight container 7 is coated with a phosphor 9. Note that the protrusion 7a of the airtight container 7 is provided to control the coldest point, and the tip 7b of the protrusion 7a is usually
is the coldest point. Lamp 1 configured in this way
0 is fixed to a cylindrical container 11, and a high frequency generation circuit 12 is housed in the cylindrical container 11. 13 is a light bulb-shaped base; 14 is an induction coil wound around the outer periphery of the airtight container 7; both ends thereof are connected to the high frequency generation circuit 12. The high frequency generation circuit 12 is composed of an input circuit 15, a bias circuit 16, and an oscillation circuit 17, as shown in FIG.

In such a conventional example, the high frequency generation circuit 12
The lamp 10 is turned on by applying high frequency energy to the lamp 10 through the induction coil 14. As described above, the electrodeless type has advantages over the above-mentioned electroded type, such as being smaller in size, higher in output, and capable of instantaneous lighting. However, the oscillation circuit 17 becomes a major source of heat and noise during operation. Therefore, if the input circuit 15, bias circuit 16, and oscillation circuit 17 are housed together in the cylindrical container 11 as shown in FIG. There were problems in that reliability deteriorated and furthermore, other circuit sections were adversely affected by noise.

[Object of the invention] The present invention has been made in view of the above problems, and
The purpose of this invention is to provide an electrodeless discharge lamp device in which reduction in reliability due to heat and noise generated from an oscillation circuit is improved.

[Disclosure of the Invention] The present invention will be described below based on examples. FIG. 1 shows one embodiment of the present invention, in which a plurality of compartments 19a, 19b, 19c are formed inside a cylindrical container 11, partitioned by a conductor 18 made of metal or the like. In each of the plurality of compartments 19, among the high frequency generation circuits, the compartment 19a near the airtight container 7 has an oscillation circuit section, the next compartment 19b has a bias circuit section, and further, In the next compartment 19c, each circuit is multi-layered in the form of a block, including an input circuit section. Further, the protrusion 7a of the airtight container 7 is extended so that its tip 7b reaches the input circuit section compartment 19c. Note that the other configurations are the same as those of the conventional example shown in FIG. 3, so the explanation will be omitted by assigning the same reference numerals to the equivalent configurations.

In this way, by isolating the oscillation circuit section, which is the main source of heat and noise, by the conductor 18, it has become possible to prevent heat and noise from propagating to other circuit sections. Furthermore, by arranging the protrusion tip 7b of the airtight container 7, that is, the coldest point, to be the farthest position from the oscillation circuit section compartment 19a, it is possible to prevent the temperature of the coldest point from increasing. .

In this embodiment, the circuit section has three layers, but the number of layers is not limited to this. Furthermore, the gas sealed in the translucent airtight container 7 is not limited to mercury and rare gases, and furthermore, it is not necessary to coat the inner surface of the translucent airtight container 7 with a phosphor. Of course.

[Effects of the Invention] As described above, the present invention comprises a light-transmitting airtight container having a protrusion for controlling the coldest point and sealing a discharge gas therein, and a cylindrical container housing a high-frequency generation circuit therein. An electrodeless discharge lamp device comprising: the cylindrical container is partitioned into a plurality of compartments by a conductor, and one of the compartments houses the main heat and noise generating part of the high frequency generating circuit. In addition, by arranging the tip of the projection for controlling the coldest point in a compartment other than the compartment mentioned above, it is possible to prevent a decrease in reliability due to heat and noise, and to prevent the lamp from decreasing due to an increase in the temperature of the coldest point. It was also possible to prevent a decrease in efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIGS. 2 and 3 are partially sectional front views showing conventional examples, and FIG. 4 is a block diagram of a high frequency generation circuit. be. 7...Translucent airtight container, 7a...Protrusion, 11
... Cylindrical container, 12 ... High frequency generation circuit, 18 ...
...Conductor, 19...Compartment.

Claims (1)

[Claims] 1. An electrodeless discharge lamp device comprising a translucent airtight container having a protrusion for controlling the coldest point and sealing a discharge gas therein, and a cylindrical container housing a high frequency generation circuit therein, wherein the cylindrical The shaped container is divided into a plurality of compartments by conductors, and one of the compartments houses the main heat and noise generating part of the high frequency generating circuit, and the tip of the coldest point control projection. is arranged in a compartment other than the compartment described above.