JPH06275241A - High-pressure discharge lamp - Google Patents

Abstract

PURPOSE:To provide effective presentation illumination based on the illumination atmosphere, improve efficiency, extend lives, and save power by making light emitting tubes arranged nearly on the tube axis in a common outer tube different in color temperature. CONSTITUTION:A cap 2 is fixed at one end of an outer tube 1, and light emitting tubes 3, 4 are supported over the longitudinal direction nearly on the tube axis of the outer tube 1 inside it. The light emitting tube 3 is sealed with prescribed quantities of sodium, mercury, and xenon gas in a translucent alumina tube, and it is used as a high-color rendering, high-pressure sodium lamp having the average color rendering index of 80 or above and the correlation color temperature of 2,500K. The light emitting tube 4 is sealed with a metal halide, mercury, and argon gas in a quartz tube, and it is used as a high-color rendering metal halide lamp having the average color rendering index of 90 or above and the correlation color temperature of 4,500K. The common external lead wire of the tubes 3, 4 is connected to the metal shell section 2a of the cap 2, and the other lead wires of the tubes 3, 4 are connected to eyelet sections 2b, 2c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a discharge lamp containing a plurality of arc tubes, and an improvement in a high pressure discharge lamp in which a luminous flux is prevented from being lowered due to light shielding between high color rendering arc tubes having an average color rendering index of 80 or more. Regarding

[0002]

2. Description of the Related Art Incandescent light bulbs such as halogen lamps, which have good color rendering properties, are often used in commercial facilities such as stores, and in consideration of power conditions, high-efficiency high-pressure metal vapor discharge lamps are used, and High efficiency and high color rendering discharge lamps are also used in indoor commercial facilities.

As this type of discharge lamp having a good color rendering property, a type in which the color temperature of the lamp is different has been developed, and the lamp is selected according to the atmosphere of the sales floor of a commercial facility.
It has been attempted to use a lamp having a high color temperature in the summer and a lamp having a low color temperature in the winter according to the season. In this case, the sensible temperature felt by human beings is several degrees or more higher in a warm atmosphere illuminated by a lamp with a low color temperature, while the sensible temperature is lower in a cool atmosphere illuminated by a lamp with a high color temperature. Therefore, it is expected that the energy required for cooling and heating can be saved by adjusting the set temperature in the room.

As the method, one lamp of a lighting fixture is replaced depending on the season, or two fixtures containing different lamps are switched depending on the season. But,
When replacing the lamp, not only will it be a dangerous work depending on the installation location of the lighting equipment, but also the maintenance and inspection costs will increase. Also, several lighting fixtures are required, which not only increases the equipment cost but also increases the space such as the installation place. Further, there is a drawback that it is difficult to change the different lamps in a short time according to the date and time.

On the other hand, a high-pressure discharge lamp in which a plurality of arc tubes are mechanically and electrically supported in an outer bulb has been proposed as a light source for mixed light illumination because various lamp characteristics can be obtained with one lamp. There is. Various combinations of arc tubes for high-pressure sodium lamps, arc tubes for metal halide lamps, and / or arc tubes for high-pressure mercury lamps are possible as arc tubes for high-pressure discharge lamps for mixed-light illumination. Since the characteristics are different, it is difficult to light and restart a plurality of arc tubes easily and reliably, and the starting device is complicated and expensive, and it has not been put to practical use.

In the above discharge lamp, a plurality of arc tubes are arranged in the outer bulb so as to be adjacent to each other in parallel to the tube axis. However, during lighting, the luminous flux is reduced by about 20% due to the shielding of each arc tube. .
Further, it is necessary to cover the inner surface of the outer bulb with a fluorescent substance or the like in order to eliminate the shadow of the arc tubes and control the light distribution, and the luminous flux is further reduced to deteriorate the lamp characteristics such as the luminous efficiency.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a plurality of arc tubes are arranged in an outer bulb substantially on the tube axis to form a discharge lamp. To provide a high-pressure discharge lamp that enables switching lighting or simultaneous lighting of arc tubes, can actively perform directed lighting in indoor and outdoor spaces such as commercial facilities, and saves labor and costs such as initial equipment costs. You can In addition, by collectively controlling a number of discharge lamps from the outside, it is possible to change the color temperature of the arc tube in a short period of time, which widens the range of production effects.In addition, the color temperature can be used differently during the summer and winter or during the day and night. It is an object of the present invention to provide a high-pressure discharge lamp that is capable of achieving high efficiency and excellent lamp characteristics, as well as being capable of achieving power saving and light-shielding of the arc tube.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention arranges a plurality of arc tubes in the outer bulb having a base at an end thereof on substantially the axis of the outer bulb and It can be switched on and off, and each of the plurality of arc tubes has an average color rendering index of 80.
The above is also characterized in that the correlated color temperatures are different.
Further, the difference in correlated color temperature between the plurality of arc tubes is characterized by being 10% or more of the rated value of each arc tube. Further, the high pressure discharge lamp is housed in a lighting fixture via a changeover switch and a ballast, and each arc tube is turned on by a changeover switch on the side of the lighting fixture when viewed from the ballast. In addition, the high pressure discharge lamp is capable of controlling a plurality of different light distributions.
It is characterized by lighting with one lighting fixture.

[0009]

With the above structure, since the color temperatures of the arc tubes arranged substantially on the tube axis in the common outer bulb are different, effective production illumination can be performed based on the illuminating atmosphere, and the luminous flux is not reduced. Therefore, it is highly efficient and has excellent life characteristics.
Further, it is possible to save labor and energy. Further, the light distribution of the lighting fixture can be easily controlled, and the lighting design is diversified.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a high-pressure discharge lamp, in which 1 is an outer bulb made of hard glass, and a pin-shaped base 2 is fixed to one end. In addition, 2 inside through the arc tube mount structure
The individual arc tubes 3 and 4 are supported in the longitudinal direction on the tube axis of the outer bulb 1. The first arc tube 3 is a translucent alumina tube filled with a predetermined amount of sodium and mercury together with xenon gas, and has an average color rendering index of 80 or more and a correlated color temperature of 250.
It is an arc tube for a high color rendering high pressure sodium lamp of 0K.
The second arc tube 4 has an average color rendering index of 90 in which mercury and argon gas are enclosed together with a metal halide in a quartz tube.
The above is the arc tube for a high color rendering metal halide lamp having a correlated color temperature of 4500K. In the arc tubes 3 and 4, a common external lead-out wire that leads to the outside is connected to the metal shell portion 2a of the base 2, and the other lead-in wire of each arc tube is connected to the eyelet portions 2b and 2c, respectively. There is. Further, a ring-shaped getter is connected to the mount structure, and the inside of the outer sphere is supported by a vacuum.

FIG. 2 shows an example of a lighting circuit for the high-pressure discharge lamp. The common external lead-in wire 6a of the arc tubes 3 and 4 arranged in the discharge lamp 5 passes through the shell portion 2a of the base to stabilize the ballast. 7, the external introduction line 6b of the arc tube 3 is connected to the eyelet portion 2b of the base, and the external introduction line 6c of the arc tube 4 is connected to one end of the changeover switch SW through the eyelet portion 2c of the base. Note that the changeover switch SW may be provided for each lighting fixture that houses the high-pressure discharge lamp, or may be a collective control system for centralized management. The other end of the changeover switch SW is connected to the power source 8 via the ballast 7. Here, the ballast is an electronic ballast, and can convert both the sine wave of the commercial AC power supply into a rectangular wave and light both the high-pressure sodium lamp and the metal halide lamp.

Next, a specific embodiment will be described with reference to FIG. When a high pressure sodium lamp arc tube with a tube input of 150 W as the arc tube 3 and a metal halide lamp arc tube with a tube input of 150 W as the arc tube 4 are applied with a power supply voltage of 200 V through an electronic ballast capable of lighting a rectangular wave,
The discharge lamp 5 became a lamp with a warm light color similar to an incandescent lamp, and the emission of a high color rendering type high pressure sodium lamp was recognized. The lamp voltage of this lamp is 100V, the average color rendering index is 85, the correlated color temperature is 2500K, and the total luminous flux is about 7
It was 800 lm. Next, when the switch SW is switched and turned on, the discharge lamp 5 emits white light, and the lamp voltage is 95 V and the average color rendering index is 96 and the correlated color temperature is 45.
The total luminous flux was 00K and the total luminous flux was about 11000 lm.

The reduction of the total luminous flux of each of the discharge lamps was not recognized even when compared with the total luminous flux of each high color rendering type high pressure sodium lamp or metal halide lamp. Considering that the atmosphere inside and outside is changed, the correlated color temperature of different arc tubes is 10%.
The above differences need to be made. Next, each arc tube of the discharge lamp was switched on after a predetermined time, and the lighting test was conducted. As a result, life characteristics of about 6000 hours were obtained.

Further, the high-pressure discharge lamp according to the present invention is not only capable of switching and lighting each other as in the embodiment, but since each arc tube is arranged substantially on the tube axis, it is electrically and mechanically mutually connected. It is easy to configure so that it can be simultaneously turned on with little influence.

FIG. 3 is a side view showing an example of a lighting fixture for housing and using a high pressure discharge lamp. The lighting fixture 10 is a downlight which is used by being embedded in the ceiling, and the fixture main body 11
The high pressure discharge lamp 5 is attached to the socket 12 attached to one end of the. Then, the light distribution control of the arc tubes 3 and 4 is performed by the reflecting mirror 13 supported inside the instrument body 11. The reflecting mirror 13a can control light distribution of the high-pressure sodium lamp arc tube 3 to be flat, and the reflecting mirror 13b can control light distribution of the metal halide lamp arc tube 4 to be a spot. In this way, by arranging the discharge lamp in one luminaire capable of different light distribution control, various lighting effects are possible.

FIG. 4 is a perspective view of a floodlight 20 showing another embodiment. A reflector 22 mounted inside the instrument body 21 has a wide-angle reflector 22a and a narrow-angle reflector. It is composed of a mirror 22b and has a high pressure discharge lamp 5 inside.
Is installed. Then, the switch SW installed on the side surface of the appliance body can be switched on and off, and the light color and light distribution of the lamp can be selected.

In the above embodiment, the case where two types of arc tubes having different correlated color temperatures of the same tube input are turned on by one ballast has been described, but the case of three or more types is also possible. . Further, the discharge lamp according to the present invention can be lit by a plurality of ballasts even when the tube input of each arc tube is different or the correlated color temperature is different. Further, the ballast may be either electronic or copper-iron. In the above embodiment, the discharge lamp in which the base is fixed to one end of the outer bulb has been described, but it is necessary to lengthen the outer bulb by arranging the arc tube approximately on the tube axis in the outer bulb. By using a compact arc tube with a small capacity of 200 W or less, it can be stored in a generally used T-shaped outer bulb.

By arranging a plurality of arc tubes in the common outer bulb substantially on the tube axis as described above, the mutual shielding of the arc tubes and the influence of their shadows are eliminated, and the total luminous flux of the discharge lamp is not reduced.
Further, since the mutual influence of the arc tubes is small in the outer bulb, the arc tubes can be simultaneously turned on and can be used as a high pressure discharge lamp for mixed light illumination. Further, since it is a high color rendering type discharge lamp, even if the same illuminance as that of a halogen lamp or the like is obtained, the power consumption can be reduced to half or less, and energy saving can be achieved. Also, the season,
Since it is not necessary to replace the lamp every day or hour and only the changeover switch is used, labor saving such as manpower and replacement work can be achieved. In addition, by changing the color temperature of the discharge lamp to illuminate with a lamp with a high color temperature in the summer and to illuminate with a lamp with a low color temperature in the winter, you can experience the feeling that people feel. The temperature can be changed by 1 to 2 ° C, and the energy required for cooling and heating can be saved by setting the temperature for air conditioning.

[0019]

As is apparent from the above description, according to the present invention, a plurality of arc tubes in the outer bulb can be mutually lit or simultaneously lit with a relatively simple structure, and the indoor and outdoor production of a commercial facility or the like can be performed. Lighting can be performed effectively over a wide variety of areas, and its industrial utility value is great. Further, there is an advantage that not only the total cost such as initial equipment investment and maintenance cost can be reduced, but also power saving, energy saving, labor saving, etc. are great. Furthermore, there is no decrease in the luminous flux of the lamp,
A highly efficient discharge lamp can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a high pressure discharge lamp according to the present invention.

FIG. 2 is an explanatory diagram similarly showing an example of a lighting circuit.

FIG. 3 is a side view showing an example of a lighting fixture that also stores and uses a high-pressure discharge lamp.

FIG. 4 is a perspective view showing a floodlight of another embodiment.

[Explanation of symbols]

 1 Outer bulb 2 Base 3, 4 Arc tube 5 High-pressure discharge lamp 6a, 6b, 6c External lead-in wire 7 Ballast 8 Power switch SW switch 10 Lighting equipment 11 Instrument body 12 Socket 13 Reflector 20 Projector 21 Instrument body 22 Reflector

Claims (4)

[Claims] 1. A plurality of arc tubes are arranged on an approximately tube axis of the outer tube in an outer bulb having a base at an end thereof, and each arc tube can be switched and turned on, and each of the plurality of arc tubes has an average color rendering. The evaluation number is 8
A high-pressure discharge lamp that is 0 or more and has different correlated color temperatures. 2. The high pressure discharge lamp according to claim 1, wherein the difference in correlated color temperature between the plurality of arc tubes is 10% or more of the rated value of each arc tube. 3. A lighting system in which the high-pressure discharge lamp is housed in a lighting fixture via a changeover switch and a ballast, and each of the light emitting tubes is turned on by a changeover switch on the side of the lighting fixture when viewed from the ballast. The high pressure discharge lamp according to claim 1 or 2. 4. The high-pressure discharge lamp according to claim 1, wherein the high-pressure discharge lamp is lit by a single luminaire capable of different light distribution control.