JPH0713174Y2 - Electrodeless discharge lamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electrodeless discharge lamp device using a high frequency electromagnetic field.

[Prior Art] Recently, an electrodeless discharge lamp device for applying an electromagnetic field or an electromagnetic wave from the outside to an electrodeless discharge lamp to discharge and emit light has been researched and developed. Unlike the conventional light source device using a discharge lamp having electrodes, these devices have a long life because they do not have electrodes, and have a characteristic that light flux deterioration due to scattering of electrode substances is small.

FIG. 5 shows an example of the above electrodeless discharge lamp device. After the inside of the arc tube 1 is evacuated, mercury and rare gas are sealed and sealed. When the excitation coil 2 is wound around the outer circumference of the arc tube 1 and a high frequency current is supplied from the high frequency power source 3 to the coil 2, an electromagnetic field is generated in the arc tube 1, glow discharge is generated in the tube, and heat due to glow discharge is generated. The enclosed mercury evaporates and gradually shifts to arc discharge.

[Problems to be Solved by the Invention] In the electrodeless discharge lamp device as described above, the electromagnetic field generated when a high-frequency current is applied to the coil 2 is strong in the vicinity of the coil 2 and increases with distance from the coil 2. become weak. Therefore, the glow discharge generated in the arc tube 1 is strong in the vicinity of the coil 2 and weakens as it moves away from the coil 2. Therefore, depending on the location of mercury,
Even when a glow discharge is generated by passing a high-frequency current, the evaporation of mercury due to the heat of the glow discharge is not promoted, the time required for transition to arc discharge becomes long, and the rise time of the luminous flux becomes long.

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an electrodeless discharge lamp device that promotes transition to arc discharge and has a short luminous flux rise time.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an arc tube in which a luminescent material is enclosed, an excitation coil wound around the arc tube, and a high-frequency current applied to the coil. In an electrodeless discharge lamp device provided with a high-frequency power source for energizing, the excitation coil is not along a meridian or a latitude line on a virtual sphere circumscribing the arc tube, and the winding direction of the coil is not on the same plane. It is characterized by being wound like.

[Operation] With the above configuration, the distance between the coil and the tube wall of the arc tube becomes more uniform. Therefore, when a high frequency current is applied to the coil, the intensity of glow discharge generated in the arc tube is reduced. Be uniform. Therefore, regardless of the location of mercury in the arc tube, the evaporation of mercury after the occurrence of glow discharge becomes smooth, the transition time to arc discharge becomes short, and the rise time of the light flux becomes short.

[Embodiment] FIG. 1 shows an embodiment of the present invention.
Arc tube 1 with mercury and rare gas sealed after evacuation
An excitation coil 2 having a shape described later is wound around the outer circumference of the coil and the coil 2 is connected to a high frequency power source 3.

FIG. 2 shows the shape of the excitation coil 2, which is shown in FIG.
Shows a front view, and FIG. 6 (b) shows a left side view. As is clear from the figure, the excitation coil 2 is wound along a meridian on a virtual sphere circumscribing the arc tube 1 and in such a manner that the winding direction of the coil is not on the same plane.

In the electrodeless discharge lamp device configured as described above, the coil 2
In order to make the distance between and the tube wall of the arc tube 1 more uniform,
When a high frequency current is passed through the coil 2, the intensity of glow discharge generated in the arc tube 1 becomes uniform. Therefore, regardless of the location of mercury in the arc tube 1, the evaporation of mercury after the occurrence of glow discharge is smoothed, the transition time to arc discharge is shortened, and the rise time of the luminous flux is shortened. FIG. 3 shows the measurement results of the luminous flux rise time of the present invention and the conventional example. As is clear from the figure, in the present invention, it is possible to significantly shorten the luminous flux rise time.

Next, FIG. 4 shows a different embodiment of the coil according to the present invention. In this embodiment, even if the number of turns of the coil 2 is one, the glow discharge can be made uniform and the luminous flux rise time is increased. Can be shortened.

It should be noted that, although the high-pressure mercury lamp is tentatively described in each of the above embodiments, the present invention is not limited to this, and, for example, a metal halide in which mercury, a rare gas, or a metal halogen compound is enclosed as an enclosure substance in the arc tube. In the case of a lamp, the vapor pressure of the metal, which is the main light-emitting substance, is low, so that the above effect is more effective than in the case of a high-pressure mercury lamp.
Further, it goes without saying that it is also effective in the case of a fluorescent lamp.

[Advantages of the Invention] As described above, according to the present invention, the shape of the excitation coil is configured so that the distance between the tube wall of the arc tube and the excitation coil is made uniform. It can be shortened and the rise time of the light flux can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, FIG. 2 shows the shape of an excitation coil of the same, FIG. 1 (a) is a front view, FIG. 2 (b) is a left side view, FIG. 3 is a graph showing the measurement results of the luminous flux rise time of the present invention and the conventional example, FIG. 4 shows a different embodiment of the coil according to the present invention, FIG. 3A is a perspective view, and FIG. ) Is a view from the direction of arrow A, FIG. 5C is a view from the direction of arrow B, and FIG. 5 is a schematic view showing a conventional example. 1 ... Arc tube, 2 ... Excitation coil, 3 ... High frequency power source

Claims (1)

[Scope of utility model registration request] 1. An electrodeless discharge lamp device comprising an arc tube in which a luminescent material is enclosed, an excitation coil wound around the outer circumference of the arc tube, and a high frequency power source for supplying a high frequency current to the excitation coil. An electrodeless discharge characterized in that the excitation coil is wound along a meridian or a latitude line on a virtual sphere circumscribing the arc tube, and the winding direction of the coil is not on the same plane. Electric lighting device.