JPS63131459A - High-tension discharge lamp device - Google Patents

Abstract

PURPOSE:To shorten a time from starting to stable lighting in emission by specifying input power per weight of a luminous tube and air-cooling this luminous tube. CONSTITUTION:A luminous tube 1 for use is made of a transmitting heat- resisting material whose input power per weight of a luminous tube is 20 W/g or more. When a power is turned on, a voltage is applied to both of main electrodes 2a and 2b, and discharge is started. When a lighting state becomes stable and at the same time when stable lighting begins, a fan for a cooling means 7 is rotated and the luminous tube 1 is air-cooled through a passing hole 5a so that a maximum temperature of a tube wall is 900 deg.C or so and the coolest point temperature of the tube wall is 790 deg.C or so. Hence, a starting characteristic and efficiency are upgraded and a life time can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high pressure discharge lamp device with good starting characteristics.

[Conventional technology]

Figure 3 shows, for example, a conventional high-pressure discharge lamp with a rated power of 400 W, as disclosed in Japanese Patent Application Laid-Open No. 59-132556. The arc tube is made of silica glass and has a pair of main electrodes (2') (+ on 2) arranged inside both ends of the arc tube. Along with the arrangement.

It is an outer tube with a cap (4) attached to one end, and the inside is filled with, for example, nitrogen gas. (5) is a translucent covering that covers the outer surface of the lower end of the arc tube +1 to increase the temperature at the coldest point.

Conventional high-pressure discharge lamps configured in this manner are lit with the 9 cap (4) facing upward, and the 9 arc tube fil
The lower end of the arc tube if) becomes the coldest point due to the convection of the gas inside and the convection of the gas inside the outer tube (3). On the other hand, arc tube 1)
The vapor pressure within is determined by the coldest point temperature.

The higher the vapor pressure, the higher the luminous efficiency.

Therefore, in order to increase the temperature of the coldest point in the arc tube if),
A covering (5) is provided on the lower end of the arc tube +11. It is designed so that the coldest point is near the softening point of the quartz glass, which is the material of the 9 arc tube + 1), and the upper limit of the reaction humidity between the quartz glass and the chlorine.

[Problem that the invention seeks to solve]

However, the conventional high-pressure discharge light emitting device constructed in this manner has a problem in that it takes 2 to 7 minutes to obtain light emission.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a high-pressure discharge lamp device in which the time from start to stable lighting is short.

[Means for solving problems]

The high-pressure discharge lamp device according to the present invention includes an arc tube whose input power (tube wall load) per weight of the arc tube is zow/g or more;
A cooling means for cooling the arc tube with air is provided.

[Effect]

In this invention, the temperature of the ninth arc tube, especially the temperature at the coldest point, of the ninth arc tube, which has a large input power per arc tube weight υ of 20 W/g or more, is quickly raised (increased) to emit light quickly and stably. Moreover, the cooling means suppresses excessive temperature rise of the arc tube during stable lighting.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Figure 1 shows a high-pressure discharge lamp device with an input power of 400W. In the conventional example shown in Fig. 3, the input power (tube wall load) per weight of 9 arc tubes is 2γW/g in an arc tube made of quartz glass with electrodes (2b) disposed. It is smaller in size than an arc tube.

Note that the weight of the arc tube (9) means only the portion made of quartz glass, and does not include other accessories. (4
a) (4b) are attached to both ends of the arc tube and are electrically connected to the main electrodes (2a) and (2b), respectively; 15) is a bowl-shaped reflecting plate with one end open; Reference numeral (6b) is a support mounted opposite to this reflector, and the cap (48) (4b) is mounted to support the arc tube (1) within the reflector (5) and to provide a lead from the outside. The amphibious electrodes (2a) (2b) of the arc tube (1) are connected through the wires.
). (5a) is the above arc tube 1
The reflection plate (5) facing the main electrode (2a) has a plurality of passing holes formed in K, and the diameter is large in the vicinity of the arc generated between the main electrodes (2a) (2b), and in the central part of the The diameter is made smaller at both ends. A part of the reflection plate (5) including these five passage holes serves as a shielding plate for the cooling means (7). (7)
Valve these multiple passage holes (5a) to connect the arc tube +1
) is a cooling means equipped with a fan for forced air cooling, and is mounted on the top of the reflector plate (5). (
Reference numeral 5b) denotes an outlet for air to flow out, which is formed at the open end of the reflecting plate (5).

) 8) is a front glass installed to cover the opening of the reflector plate (5), and is used to cant the ultraviolet rays emitted from the arc tube El) from being emitted to the outside.

In the high-pressure single lamp device configured in this way.

First, when the power is turned on, the ballast (not shown) starts.

IJ-)"i, receiver (6I!1n (6b) and cap (4
11) (4b) Both main electrodes (2a) (2b) through
A voltage is applied between.

A discharge starts between the two main electrodes (2a) and (2b), and eventually a stable light emitting state is achieved.At the same time, the fan of the cooling means (7) rotates and the arc tube passes through the first passage hole (5a). (Sato) is air-cooled. When the light is turned off, when the power is turned off, the discharge of the arc tube f1) is stopped, and the rotation of the fan of the cooling means (7) is also stopped.

And in the above-mentioned high pressure discharge lamp device.

The time it takes to achieve 80% of the rated light emission after turning on the power is about 1 minute 20 seconds on average, which is faster than conventional models (stable lighting is rare. Moreover, only 9 arc tubes (11
The maximum temperature on the tube wall was approximately 900°C, and the coldest point temperature was approximately 790°C. Adverse effects such as softening of the arc tube and reactions between halogen and the arc tube were rare. Even including the power consumed by the cooling means (7), the efficiency was about 5% higher than that of the conventional lamp shown in FIG.

Furthermore, when a life test was conducted, it was found to be over 9000 hours. In short, the above-described high-pressure discharge lamp device is comparable in life to conventional high-pressure discharge lamps and has excellent starting characteristics and efficiency.

Next, various high-pressure discharge lamp devices having the above-described configurations were manufactured,
A life test was conducted and the maximum temperature of 9 arc tubes + 11 tube walls was approximately 930 degrees Celsius or less, and the air volume, direction and distribution of the fan of the cooling means (7) were adjusted so that the coldest point temperature was 790 degrees Celsius or less. It was found that the lifespan is over 9000 hours.

Based on this test result, various arc tubes +11 with different input power per arc tube weight were manufactured, and a 400W high-pressure discharge lamp device incorporating these arc tubes +1) was manufactured and the starting characteristics were as follows. Rin conducts the test. First, the air volume, air direction, and distribution in the fan of the cooling means (7) are adjusted so that the maximum temperature of the arc tube tll tube wall is 930° C. or less and the coldest point temperature is approximately 790° C.

After that, once the light is turned off and the 9 arc tube il+ has cooled down sufficiently,
The light was turned on again under the conditions set above, and the time from when the power was turned on to when 80% of the light output of the rated light output was obtained was measured.

As is clear from the figure, the larger the input power per arc tube weight (1), the thicker the arc tube (1) is.
The smaller the size of 1) and the smaller the heat capacity, the faster (
It can be seen that the lighting is stable. In addition.

Arc tube with an input power of 17 W/g based on the weight of the arc tube (1)
This is the same arc tube as the conventional one shown in Figure 3. In order to achieve the set temperature conditions mentioned above, it is necessary to stop the cooling means (7) and keep the arc tube (1) in a state where it is not air-cooled. It is something. In addition, in the case of using an arc tube (CI) with less than zow/g, the temperature of the wall of the arc tube (1) will not rise to the above setting condition unless the air volume by the fan of the cooling means (7) is reduced. Moreover, since the air volume was small, the cooling effect was unstable, and the time required for stable lighting was also variable, making it difficult to achieve the desired effect. 20W/
If six or more arc tubes 11 are used, the air volume will also be large.

We also measured the time it takes for the cooling effect to become stable and stable lighting to occur, and all of the lamps were close to the example shown in Figure 2.

In short, an arc tube (1) with an input power of 20 W/g or more per tube weight is used, and a cooling means (
7) by air cooling the arc tube (1).

A high pressure discharge lamp device with excellent starting characteristics and efficiency and a long life can be obtained.

On the other hand, the time from the string light until the next start (restart time)
When I investigated K, I found that the above is 7? In the case of the example, it takes 1 minute and 10 seconds to restart, which is much shorter than the conventional method, which takes about 12 minutes. This is because the temperature of the arc tube (1) decreases quickly as the arc tube (1) is cooled by the cooling means (7). What is necessary is to control the air volume from the cooling means (7) at the time of restart to be larger than the air volume from the cooling means (7) at If the arc tube (1) is cooled down, restarting becomes easier.

We also investigated the efficiency of one engine and found that the cooling means (7
) The efficiency, which does not include power consumption, increases as the human power per unit weight of the arc tube (1) increases.

The efficiency including the power consumption by the cooling means (power) is for a 17W/g arc tube that does not require the cooling means (7) to be driven*
An arc tube of 22"/g or more was expensive.

In addition, in the above embodiment, the reflection plate (5) disposed between the fan of the cooling means (7) and the arc tube fil.
Assuming that a shielding plate consisting of a part of is formed with a large hole in the center and small holes at both ends, one arc tube (11) is made so that the maximum temperature does not rise above 930°C when the coldest point temperature is about 790°C. However, a shielding plate may be provided between the end of the nine arc tubes (1) and the fan to reduce the amount of air hitting the end of the one arc tube (1) where the temperature is the coldest point.

In addition, in the above embodiment, the air volume from the fan of the cooling means (7) is the same during startup and during stable lighting, but the air volume from the fan of the cooling means (7) at startup is the same when stable lighting It may be smaller than the air volume, or even zero, and in this case, the starting time will be even shorter.

Furthermore, the above embodiment describes an arc tube (1) in which a metal halide such as scandium iodide or sodium iodide is sealed, but the invention is not limited to this, and a high-pressure discharge lamp may be used. Any type of power source may be used, and a power source other than 400W, for example, a power source of toolow power, will have the same effect.

〔Effect of the invention〕

As described above, the present invention uses an arc tube whose input power per arc tube M is 20 W/g or more.

Since a cooling means for forcibly cooling the arc tube is provided, it has the effect of shortening the time from start to stable lighting without impairing the life.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the input power per weight of the arc tube and the time required to reach 80% of the luminous flux during rated lighting. FIG. 3 is a diagram showing a conventional high pressure discharge lamp. In the figures, +1) is the arc tube, (2 (2b) is the main electrode, and (7) is the cooling means. In each figure, the same reference numerals indicate the same - or equivalent parts.

Claims (7)

[Claims] (1) Made of a translucent heat-resistant material that is filled with at least mercury and a starting rare gas, has a pair of opposing main electrodes, and has an input power of 20 W/g or more per arc tube weight. A high-pressure discharge lamp device equipped with an arc tube and cooling means for forced air cooling of the arc tube. (2) The high-pressure discharge lamp device according to claim 1, wherein the cooling means is configured to more strongly cool the wall of the arc tube located near the arc generated between the two main electrodes. (3) The cooling means includes a fan and a shielding plate disposed between the fan and the arc tube, which has a large hole near the arc generated between the two main electrodes and a small hole at a distance. A high-pressure discharge lamp device according to claim 2, characterized in that it has the following. (4) The high-pressure discharge lamp device according to claim 3, wherein the shielding plate is a part of a reflecting plate in which the arc tube is disposed. (5) The cooling means includes a fan and a wind shield plate provided between the fan and the wall of the arc tube located away from the arc generated between the two main electrodes. A high pressure discharge lamp device according to claim 2. (6) The high-pressure discharge lamp device according to any one of claims 1 to 5, wherein the air volume of the cooling means is controlled to be smaller during startup than during stable lighting. (7) The high-pressure discharge lamp device according to any one of claims 1 to 6, wherein the cooling means is controlled so that its air volume is greater during restart than during startup. .