JPS6020450A - High pressure sodium lamp - Google Patents

Abstract

PURPOSE:To suppress the scattering of electrode material at lamp start and improve the life characteristics of the lamp by sealing neon-krypton mixed gas in a glow tube as the starting gas at specific pressure and at a partial pressure ratio and starting the gas using a lighting tube or a thermal starter. CONSTITUTION:The inner part of the glow tube 3 of a high pressure sodium lamp 1 with the rated input of 70 to 100W is sealed with sodium, metal for buffering gas and neon-krypton mixed gas (krypton partial pressure ratio 45 to 60%) as the starting gas in 20 to 220Torr. Heat protective coats 4 and 5 are provided on both ends of the glow tube 3 and the maximum cooling point temperature of the glow tube is improved during its lighting. The glow tube 3 and a lighting tube 9 connected in parallel with the tube are provided in an outer tube 11. A starting assisting conductor 6 is provided on the outer wall of the glow tube 3 and is connected to a stem wire 8 through a heat-response switch 7. While the glow tube is lighting, the switch is separated from the outer wall of the glow tube 3 by the actuation of the heat-response switch 7.

Description

[Detailed description of the invention] Industrial applications The present invention relates to high pressure sodium lamps.

Conventional configuration and its problems High color rendering properties with increased sodium vapor pressure during lighting.

A 150A, 400W pressure sodium lamp has already been commercialized. This lamp has a warm light color similar to that of an incandescent light bulb and a high color rendering index Ra of about 86. Furthermore, this lamp is 200V
In order to be able to start with the following voltage, a neon-argon mixed gas containing 0.1 to 1 line of argon was added to 20 s.
OTorr is included.

Incidentally, recently, there has been a strong demand for low power IJ lamps with high color rendering properties and high pressure, especially lamps of 100 W or less.

In actually commercializing a lamp with a power rating of 0 to 100 W, there are problems with the rise in lamp voltage during movement and the starting of the lamp.

Specifically, neon containing 0, 1 to 1 argon, which is used in current 160 to 400 W lamps.
Although a lamp with about 30"rr of argon mixed gas sealed in the arc tube can be started with a 200V power supply, there is a problem in that the end of the arc tube darkens severely during operation, resulting in a large rise in lamp voltage. Ta.

OBJECT OF THE INVENTION The present invention has been made in order to eliminate such problems.The present invention has been made to provide a rated input cuff of 0 to 100 W that can be reliably started with a commercial power supply of 200 V and that has a small lamp voltage increase during movement.
This is a high-pressure thorium lamp.

Structure of the Invention The high-pressure monolithium lamp of the present invention has a rated input of 70 to
100W, with an arc tube inside the outer bulb and a lighting tube or thermal starter to apply starting voltage to it.
In addition, a starting auxiliary conductor is attached to the outer wall of the arc tube, and neon is added as a starting rare gas inside the arc tube.
The krypton mixed gas is sealed at a pressure of 2o~220T.
orr and the krypton partial pressure ratio is 45 to 60. This suppresses the scattering of the electrode material and suppresses the increase in lamp voltage during movement.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a lighting circuit for a high-pressure sodium lamp according to an embodiment of the present invention, and FIG. 2 shows a front view of a high-color-rendering high-pressure sodium lamp with a rated input of 100 W.

As shown in FIG. 2, the high-pressure sodium lamp 1 is equipped with electric currents 1-i1ii (not shown) at both ends of an arc tube 3, and contains sodium, a metal for a buffer gas, and a neon gas as a starting gas. Krypton mixed gas (krypton partial pressure ratio 45-60%) is sealed at 20-220 Torr. Thermal protection films 4 and 5 are provided at both ends of the arc tube 3 to increase the temperature of the coldest point of the arc tube 3 during lighting. Inside the outer tube 11, there is provided an arc tube 3 and a lighting tube 9 connected in parallel thereto. A starting auxiliary body 6 is provided on the outer wall of the arc tube 3, and this starting auxiliary conductor 6 is connected to the stem wire 8 via a thermally responsive switch 7, and when the thermally responsive switch is activated during lighting, the arc tube 3 is started. It is set away from the outer wall.

Now, as shown in FIG. 1, when power supply voltage is applied to the high-pressure sodium lamp 1 via the ballast 2, the lighting tube 9 operates to generate a high voltage, and this high voltage causes the The high pressure sodium lamp 1 is started.

Note that after the lamp is lit, the lighting tube 9 closes due to radiant heat from the arc tube 3, creating high pressure.) In order to prevent the IJum lamp 1 from turning off, the heat-responsive switch 10 opens while the lamp is lit. There is.

The high-pressure thorium lamp 1 according to the embodiment of the present invention has no problems in starting characteristics, and the lamp voltage rise during the digging stroke is limited to 90% of the rated life.
It was confirmed through experiments that the voltage was 4V or less even after 000 hours.

Next, an experimental example in which the effects of the present invention were confirmed will be described.

The arc tube 5 of the high-pressure sodium lamp 1 used in the experiment has an inner diameter of 6.1mm, and a diameter of 27ff.
Inside, 3.5711 g of sodium, 6.9 m'j of mercury, and a neon-krypton mixed gas are sealed. At both ends of the arc tube 3 are attached thermal protection films 4 and 6 made of tantalum, each having a thickness of Q, a period of Q4, and a width of 12 degrees. The starting auxiliary conductor 6 is made of straight molybdenum with a diameter Q, 4M, and a total length of 32 elbows, and one end thereof is connected to the stem wire 8 via a bimetal switch 7. The inside of the outer tube 11 is kept in a vacuum by a getter 12.

A lamp was prepared in which the pressure of the neon-krypton mixed gas sealed in the arc tube s was varied from 16 to 300 Torr, and the krypton partial pressure ratio in the neon-krypton mixed gas was varied from 30 to 60%, and the maximum voltage was 2500 V when no load was applied. Using the lighting tube 9 that generates a pulse voltage of 0.6
A lifespan test was conducted using a time-off cycle. The lamp voltage increase after 9000 hours was as shown in the table below.

Below Margin As is clear from the table above, the lamp voltage is below jA, 4V, which is not a practical problem after the life (9000 hours) (because the light color and color rendering properties change as the lamp voltage changes). It can be seen that this can be suppressed when the krypton partial pressure ratio of the neon-krypton mixed gas is 45 factors or higher and the sealed pressure is 20 Torr or higher. On the other hand, as shown in FIG. 3, the lamp starting voltage increases monotonically as the krypton partial pressure ratio of the neon-krypton mixed gas increases. In particular, E260 specified in JIS c7709 r Types and dimensions of lamp caps and holders.
It is understood that gold has a breakdown voltage of 220 Torr or less in practical use.

In the above, it goes without saying that the same results as in the case of the lighting tube can be obtained even when a thermal starter is used instead of the lighting tube. Here, the term "thermal starter" refers to one consisting of, for example, a series body of a resistor and a heat-responsive starter.

Although the above results were obtained with a 1 oow lamp, it has been confirmed that almost the same results can be obtained with a 7 oW high color rendering lamp, and that they can be equally obtained with a general high-pressure sodium lamp. .

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention is a 7Q to 100W high pressure sodium lamp, in which a neon-krypton mixed gas is used as a starting gas in the arc tube at 20 to 220 Torr.
and set the krypton partial pressure ratio to 45 to 60%,
By starting the lighting tube with a thermal starter, it is possible to greatly suppress the scattering of electrode material when starting the lamp, suppress the rise in lamp voltage during operation, and has excellent life characteristics. It is capable of providing high pressure sodium lamps.

[Brief explanation of the drawing]

Fig. 1 is a lighting circuit diagram of a high-pressure sodium 1-lium lamp according to the present invention, Fig. 2 is a front view of a high-pressure sodium lamp which is an embodiment of the present invention, and Fig. 3 is a relationship between insertion pressure and starting voltage. FIG. 1... High pressure sodium lamp, 2...
Ballast, 3... Luminous tube, 6... Starting auxiliary conductor, 7... Eager deactivation switch, 8... Drop wire, 9... ...
Lighting tube, 10...Thermal response switch, No. 11...
...Outer tube.

Claims (1)

[Claims] Equipped with electrodes on both ends, neon gas is used as starting gas inside.
A rated cuff 0-100W lamp comprising an arc tube filled with krypton mixed gas, and a lighting tube or a thermal starter connected in parallel with the arc tube inside the outer bulb, the lamp having a starting aid attached to the outer wall of the arc tube. In addition to attaching a conductor, the sealing pressure of the neon-krypton mixed gas is 20
A high-pressure sodium lamp characterized in that the partial pressure ratio of krypton in the neon-krypton mixed gas is in the range of 45% to 60%.