JPH053108B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a high-pressure sodium discharge device that combines a high-pressure sodium discharge lamp with a floodlight. Conventional structure and its problems High-pressure sodium discharge lamps are approximately 2 times larger than mercury lamps.
It has double the efficiency and is attracting attention as a light suitable for the energy-saving era, and is increasingly being used. However, in the past, when a high-pressure sodium discharge lamp was lit in combination with a floodlight, especially an existing mercury lamp floodlight, the lamp voltage increased compared to when the lamp was lit bare, and the lamp sometimes went out. Something happened. Purpose of the Invention The present invention was made to eliminate such problems, and is a high-pressure sodium discharge lamp equipped with a high-pressure sodium discharge lamp that has a small increase in lamp voltage and does not turn off even when lit in combination with a floodlight. A discharge device is provided. Structure of the Invention The present invention combines a high-pressure sodium discharge lamp in which the electrode length on the base side of the arc tube is shorter than the electrode length on the opposite side of the base with a floodlight to suppress an increase in lamp voltage. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a high-pressure sodium discharge device which is an embodiment of the present invention, FIG. 2 shows an example of a high-pressure sodium discharge lamp used in the device of the present invention, and FIG.
The figure shows an example of an arc tube of a high-pressure sodium discharge lamp used in the apparatus of the present invention, and FIG. 4 shows a lighting circuit for the high-pressure sodium discharge lamp. As shown in FIG. 1, the high-pressure sodium discharge device according to the embodiment of the present invention includes a high-pressure sodium discharge lamp 1 and a floodlight 2. As shown in FIG. As shown in Fig. 2, the high-pressure sodium discharge lamp 1 has electrodes 3 and 4 (see Fig. 3) at both ends, and is a light-emitting lamp with sodium, buffer gas metal, and starting rare gas sealed inside. The luminous tube 5 is installed inside the tube 5 and the inside that is evacuated by the getter 6.
It is equipped with an outer tube 8 to which a cap 7 is attached, stem wires 9 and 10 for supplying electric power to the arc tube 5 and supporting it, and further includes a heater 11 in parallel with the arc tube 5 and a A starter unit 13 (see FIG. 4) is connected in series with a thermally responsive switch 12 consisting of a normally closed bimetallic switch opened by the arc tube 5.
An auxiliary starting conductor 14 is attached to the outer surface of the auxiliary starting conductor 14, and this auxiliary starting conductor 14 is kept in an electrically floating state by opening a thermally responsive switch 15 such as a bimetallic switch during lighting. . Arc tube 5 of such a high pressure sodium discharge lamp
As shown in FIG. 3, the electrode length A on the base side is shorter than the electrode length B on the side opposite to the base (A<B). The lighting circuit itself for such a high-pressure sodium discharge lamp is the same as the conventional one, as shown in FIG. Now, as shown in FIG. 4, when a power supply voltage is applied to the high-pressure sodium discharge lamp 1 through the single choke-type ballast 16, both electrodes 3, Discharge starts within 4 hours, and the high-pressure sodium discharge lamp 1 lights up. According to the high-pressure sodium discharge device of the embodiment of the present invention, since the electrode length A on the cap side of the arc tube 5 is shorter than the electrode length B on the opposite electrode side, the high-pressure sodium discharge lamp 1 can be lit in combination with a floodlight. It has also been experimentally confirmed that the rise in lamp voltage is small and no fading occurs. Next, an experimental example in which the effects of the present invention were confirmed will be described. a High-pressure sodium discharge lamp in the device of the present invention (hereinafter referred to as the discharge lamp of the present invention) (structure shown in Figure 2) Arc tube Dimensions: inner diameter 9.7 mm, total length 174 mm Material: polycrystalline alumina Electrode length: base side 18.5 mm, reverse side Base side 20.5mm Distance between electrodes: 135mm Filled materials: 3.7mg sodium, 16.3mg mercury, 250Torr xenon gas b High-pressure sodium discharge lamp in conventional equipment (hereinafter referred to as conventional discharge lamp) Arc tube Dimensions: inner diameter 9.7mm, total length 174mm Material : Polycrystalline alumina Electrode length: 19.5 mm on the base side 19.5 mm on the opposite base side Distance between electrodes: 135 mm Filled materials: 3.7 mg of sodium, 16.3 mg of mercury, 250 Torr of xenon gas Five of each of the above discharge lamps were made, and the bare We measured the lamp voltage when the lamp was lit at a constant power supply voltage of 200 V (60 Hz) using a 700 W mercury lamp ballast in the projector, and the results are shown in the table below.

[Table] As is clear from the above table, the rise in lamp voltage of the high-pressure sodium discharge lamp in the device of the present invention is smaller than that in the high-pressure sodium discharge lamp in the conventional device, and according to this example, the increase in lamp voltage is approximately 1/1. It has dropped to 3. In addition, in the device of the present invention, the high pressure sodium discharge lamp did not go out. Effects of the Invention As explained above, the present invention can provide a high-pressure sodium discharge device equipped with a high-pressure sodium discharge lamp that has a small increase in lamp voltage and does not turn off even when lit in combination with a floodlight. It is something.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a high-pressure sodium discharge device that is an embodiment of the present invention, FIG. 2 is a front view showing an example of a high-pressure sodium discharge lamp used in the device of the present invention, and FIG. 3 is a device of the present invention. A cross-sectional view showing an example of an arc tube of a high-pressure sodium discharge lamp used in
The figure shows a lighting circuit for a high-pressure sodium discharge lamp. 1... High pressure sodium discharge lamp, 2... Floodlight,
3, 4... Electrode, 5... Arc tube, 7... Base, 8
... Outer tube, 9, 10 ... Stem wire, 11 ... Heater, 12 ... Thermal response switch, 13 ... Starter unit, 14 ... Starting auxiliary conductor, 15 ... Thermal response switch, 16 ... Single Chiyoke type ballast.

Claims (1)

[Claims] 1. A high-pressure device having an arc tube with electrodes at both ends and filled with sodium, buffer gas metal, and starting rare gas, and an outer tube with a single cap in which the arc tube is installed. 1. A high-pressure sodium discharge device comprising a sodium discharge lamp combined with a floodlight, characterized in that the length of the electrode on the base side of the arc tube is shorter than the length of the electrode on the side opposite to the base.