JPS63131460A - High-tension discharge lamp device - Google Patents

Abstract

PURPOSE:To prevent color rendering from being deteriorated during light regulation by performing forced-air cooling of a luminous tube during rated lighting and making the amount of a wind during the light regulation smaller than that of a wind during the rated lighting. CONSTITUTION:During the first light regulation, relay contacts 15, 17 are closed and other relay contacts 14, 16, 18 are opened, and power smaller than rated power is applied to a luminous tube 1 so that 80% emission is obtained, and the tube 1 is air-cooled by the wind which is smaller in its speed than that during rated lighting and which comes from a fan in a cooling means 7 so that a tube wall temperature of the tube 1 is 930 deg.C or less at its maximum and is about 790 deg.C on its coolest point. Besides during the second light regulation, the relay contact 18 is closed and the other relay contacts 14 to 17 are opened, and power is applied to the tube 1 so that 60% emission is obtained, and the tube 1 is cooled by the wind which is much smaller in its speed than that during the rated lighting and which comes from the fan so that the tube wall temperature of the tube 1 is 930 deg.C or less at its maximum and is about 790 deg.C on its coolest point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a dimmable high pressure discharge lamp device.

[Conventional technology]

Figure 9 shows a conventional high-pressure discharge lamp disclosed in, for example, Japanese Unexamined Patent Publication No. 59-132556, and Figure 9 shows (
1) has mercury, a starting rare gas, and a metal halide sealed inside, and a pair of main electrodes (2a) (
2b), an arc tube made of quartz glass provided with
This arc tube is placed inside via a support frame. (5)
is a translucent coating that covers the outer surface of the lower end of the arc tube (1), and is intended to increase the temperature at the coldest point.

Conventional high-pressure discharge lamps configured in this way are lit with the two caps (4) facing upward;
The lower end of the arc tube (1) becomes the coldest point due to the convection of the gas inside and the convection of the gas inside the outer tube 13+. on the other hand.

The vapor pressure within the arc tube (1) depends on the coldest point temperature, and the higher the vapor pressure, the higher the luminous efficiency. Therefore, in order to raise the temperature of the coldest point in the 6 arc tubes (1).

The lower end of the arc tube (11) is coated with a covering (5).The softening point of the quartz glass, which is the material of the arc tube + 11, and the reaction temperature between the quartz glass and halogen etc. It is designed so that the cold spot temperature is the same as that at the coldest spot temperature.It is also designed so that the desired color rendering properties can be obtained at this set coldest spot temperature.

[Problem that the invention seeks to solve]

In recent years, there has been a growing demand for fine control of the lighting environment, and high-pressure discharge lamps are also required to have good dimming characteristics. When dimming a high-pressure discharge lamp, one arc tube (
One possible method is to reduce the light by reducing the power input to 1). However, if the input power is reduced, 1
As the temperature of the coldest point of the arc tube (1) decreases, the efficiency also decreases. When the temperature of the coldest point of the light emission W(1) decreases in this way.

The vapor pressure inside the arc tube (1) also decreases, resulting in a change in two-color characteristics and poor color rendering. Therefore, the above-mentioned high-pressure discharge lamp has the problem of being unsuitable for dimming.

This 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 color rendering properties are not deteriorated even when the light is dimmed.

[Means for solving problems]

A high-pressure discharge lamp device according to the present invention includes an arc tube whose input power (tube wall load) per inner area of two arc tubes is 19 W 7 cm2, a dimmer for adjusting the input power of the arc tube, and the arc tube. A cooling means for air cooling is provided.

[Effect]

In this invention, the two arc tubes have a tube wall load of 19 W/
Since it is larger than α2, the coldest point temperature is raised, and the cooling means air-cools the arc tube to maintain the same coldest point temperature both during rated lighting and dimming lighting.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In Figures 1 and 2, the rated input power is 100
This is a 0W high-pressure discharge lamp device, and in Figure 1, (1) is a pair of lamps in which mercury, a starting rare gas, and metal halides of sodium iodide and scandium iodide are sealed. The conventional arc tube shown in Fig. 4 is designed so that the input power (tube wall load) per inner area of one arc tube is 25 W/crrr in an arc tube made of quartz glass in which main electrodes (2a) and (2b) are arranged. The arc tube in the example is smaller in size than the arc tube. Note that the inner area of one arc tube means the total inner area of the arc tube (1) including the ends. (4a) (4 is a cap that is attached to both ends of this arc tube and electrically connected to the main electrodes (2a) and (2b), respectively; (5) is a bowl-shaped reflector with one end open. , (5a) is the vicinity of the arc generated between the two main electrodes (2a) and (2b) at the plurality of passage holes formed in the reflection plate (5) facing the arc tube (1).
There is a large hole in the center, and small holes in the positions away from the arc and at both ends of the tab. (
5b) is an outlet for air outflow formed at the open end of the reflective plate [5), and (6a) and (6b) are holders mounted opposite the reflective plate (5). , the above cap (4
a) (4b) is installed, the arc tube (11) is supported within the reflector plate (51), and power is supplied from the outside to both main electrodes (2a) (2b) of the arc tube (1) via lead wires. (7) is a cooling means that is attached to the top of the reflector plate (5) and has a fan for forced air cooling of the arc tube (1) through the plurality of passage holes (5a); The air volume during dimming is controlled so that the air volume during dimming is lower than the air volume during rated lighting.(8) is a front glass installed to cover the opening of the reflector plate (5). tube(
1) It cuts the ultraviolet rays irradiated from being emitted to the outside.

(9) are both main electrodes (2a) (2b) of the arc tube (1)
A power source for supplying power between QG (11) (13
is a choke connected between this power source and the main electrode of the arc tube (1).

The choke aO functions as a ballast during rated lighting.

The choke αIIH functions during dimming. a3
is a transformer connected between the power supply (9) and the fan of the cooling means (7), and the secondary f111 coil has two taps. αS is a relay contact connected in parallel to the choke αha, and together with the choke (11) c13 constitutes a dimming means, and the rated lighting occurs when the relay contact I is in the closed state.

Approximately 8 when relay contact αS is closed and relay contact 04 is open.
When the two relay contacts a4α9 are in the open state, the first dimmer lighting provides a light emitting state of 0 inches, and the second dimming lighting provides a light emitting state of approximately 60 inches. ae aa u is a relay contact connected between the secondary coil of the transformer α and the fan of the cooling means (7), and the IJ v-contact α
415, and the relay contact α is opened and closed in synchronization with 415.
G is in the closed state, other relay contacts + 17) as is in the open state, maximum power is given to the shift fan, and when the first dimming is turned on, the relay contact αη is in the closed state, and the other relay contacts (leα direction are in the open state) (b) A power lower than the maximum power is given to the fan, and when the second dimming is turned on, the relay contact side is in a closed state, the other relay contacts αeαη are in an open state, and an even lower power is given to the fan.

Next, the operation of the high pressure discharge lamp device configured in this manner will be explained in detail. First, rated lighting will be explained. At this time, relay contacts I and αG are in the closed state, and the other relay contact 09α
Ias is open. Therefore, the rated power is applied to one arc tube (1), and the fan of the cooling means (7) The arc tube (1) is air-cooled with strong wind speed.Next, when lighting the first dimmed light, relay contacts a9 and (Iη are closed).

When the other relay contacts αaaSα are controlled to be open, a power lower than the rated power that provides 80% light emission is applied to arc tube 1 + 11, and the maximum temperature at the tube wall of arc tube (1) is 930°C or less. The arc tube +11 is air-cooled from the fan of the cooling means (7) at a wind speed lower than that during rated lighting so that the coldest point temperature is approximately 790°C. moreover.

When lighting the second dimmed light, the relay contact side is closed and the other relay contact α port 5aean is controlled to be open. is applied to the arc tube (1), and the maximum temperature at the tube wall of the arc tube (1) is 930 degrees Celsius or less, and the cold spot temperature is approximately 790 degrees Celsius. (1) is air-cooled.

Therefore, in the above embodiment, at the time of rated lighting, the first
Since the coldest point temperature of the arc tube (1) is maintained at approximately 79G°C during dimming lighting and second dimming lighting, color characteristics are 0 even during dimming lighting, such as color temperature, light source color, and color rendering. The characteristics are the same as those obtained when the lamp is rated. Moreover, as an incidental effect, the luminous efficiency is improved by about 5 degrees compared to that shown in Fig. 4, even including the power consumed by the cooling means (7), and moreover, the lighting efficiency is 5 oso stable from the start.
The time required to obtain optical output is shortened.

Next, we manufactured and examined various high-pressure discharge lamp devices with the above-mentioned configurations, and found that the maximum temperature of the tube wall of one arc tube (1) was 930"C or less, and the coldest point temperature was approximately 790"C. This can be achieved by adjusting the design of the arc tube (1) and the air volume, direction and distribution of the fan of the cooling means (7).

It was found that the lifespan was over 9,000 hours, and the 91 color characteristics remained almost unchanged.

Furthermore, when we conducted a sensitivity test using a filter to control the light, we found that even if the characteristics of one color changed slightly, it did not affect the senses much at light outputs up to 80%.
It was found that control should be performed to obtain the same color characteristics as the rated lighting for light output of go% or more.

Furthermore, using the high pressure discharge lamp devices of the various embodiments described above,
The fan of the cooling means (7) is stopped to perform forced air cooling of the arc tube (110), and the power applied to the main electrode of the arc tube (11) is controlled until the maximum temperature of the tube wall of the arc tube (1) reaches 930°C.
When the lamp was turned on in such a state that the coldest point temperature was approximately 1900° C. or less, and the light output at the rated time was measured, the results shown in FIG. 3 were obtained. As is clear from Fig. 3, if the temperature conditions of the seven walls of the arc tube (1) are within the above range,
The one that can obtain the rated light output of 80 inches is 2 arc tubes (1) and the input power (tube wall load) to the inner surface area of the arc tube is 17.3w7. ．． 2, the maximum is 19W/an2. Therefore, in the case of an arc tube with a tube wall load of 19 W/α or more, by using the cooling means (7), it is possible to illuminate with the same color characteristics from at least 80 inches to 100 degrees of light output.

In the above embodiment, the air volume from the fan of the cooling means (71) is reflected by a plurality of passage holes formed in a part of the reflecting plate (51).
A large hole should be used in the high temperature area near the arc between the holes, and a small B hole should be used in the low temperature area away from the arc).
However, a baffle plate may be provided between both ends of the arc tube (110) and the fan to reduce the air volume at both ends of the arc tube (110).

Further, in the above embodiment, a choke a1α11a7J is used as a ballast and a dimming means, and a relay contact 0 is used as a switch.
4 to 1 second is used, but it is not particularly limited to this, and it is also possible to use an electronic circuit or the like.

Furthermore, in the above embodiment, a 1ooow type arc tube (1) in which a metal halide is sealed is described, but other high pressure discharge lamps such as a high pressure sodium lamp may also be used. etc., the same effect can be achieved.

〔Effect of the invention〕

As described above, the present invention uses an arc tube whose input power per inner surface area of the arc tube is 19 W/cIR or more, and dims this arc tube using a dimming means.

By using a cooling means, one arc tube is forcedly air-cooled at least during rated lighting, and at the same time, the air volume is reduced during dimming so that it can be air-cooled or OK, so it has the effect of being able to illuminate with almost no change in color characteristics even when dimming. It is something.

[Brief explanation of the drawing]

1 and 2 are a cross-sectional view and a circuit diagram of an essential part showing an embodiment of the present invention; FIG. 3 is a diagram showing the relationship between the tube wall load of the arc tube and the light output; and FIG. FIG. 2 is a cross-sectional view showing a conventional high-pressure discharge lamp. In the figure, (1) is the arc tube, and (2a) and (2b) are the main electrodes. (7) is the cooling means, α9α is the choke of the dimming means, α
41as is a relay contact of the dimming means. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] An arc tube that is filled with at least mercury and a starting rare gas, has a pair of opposing main electrodes, and has an input power per internal area of 19 W/cm^2 or more during rated lighting. A high-pressure discharge lamp device comprising: a light control device that adjusts input power to an arc tube; and a cooling means that forcibly air-cools the arc tube at least during rated lighting, and makes the air volume during dimming smaller than the air volume during rated lighting.