JP2001176682A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inconvenience such as an unexpected light out of a discharge lamp, by preventing the detected voltage of the Emires detector circuit of a discharge lamp lighting device from rising with the adverse effect of an output light beam of another discharge lamp lighting device. SOLUTION: With the lighting fixture for lighting discharge lamps 13A, 13B by connecting them through output terminal boards 12A, 12B to output lines 11A, 11B of each discharge lamp lighting device 7A, 7B which is provided with an Emires detector circuit 23A, 23B for detecting an Emiers state due to rise of discharge lamp voltage, the output lines 11A, 11B of respective discharge lamp lighting device 7A, 7B are disposed in a position so as not to adversely affect the detected voltage V of the Emires detector circuit 23A, 23B of the other discharge lamp lighting device 7A, 7B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus incorporating a plurality of discharge lamp lighting devices for lighting a discharge lamp.

[0002]

2. Description of the Related Art Some lighting fixtures incorporating a plurality of discharge lamp lighting devices are configured as shown in FIGS. As shown in the figure, the lighting fixture includes a fixture base 2 attached to a ceiling 1 or the like, a shadow 3 and a metal cover 4, and a plurality of discharge lighting devices 7A, 7B is attached to the instrument table 2 via the insulating plate 8. Thereby, the plurality of discharge lamp lighting devices 7A and 7B are incorporated into the lighting fixture, and the discharge lamp lighting devices 7A and 7B are assembled.
A, 7B output lines 11A, 11B to output terminal block 12A,
The discharge lamps 13A and 13B are connected to each other via 12B to turn on the discharge lamps 13A and 13B. Here, in the example of FIG.
The discharge lamp is a 0 W discharge lamp, and the discharge lamp 7B is, for example, a 40 W discharge lamp. The output powers of the discharge lamp lighting devices 7A and 7B are different from each other in accordance with the mounted discharge lamps 13A and 13B.

[0003] The plurality of discharge lighting devices 7A and 7B have the same circuit configuration.
The circuit configuration is as shown in FIG. Note that reference numerals A and B
Are the components on the discharge lighting device 7A side and the discharge lamp lighting device 7B
The reference numerals A and B are omitted in some cases, and the description will be omitted. In the case where the reference numerals A and B are not attached, the discharge lamp lighting devices 7A and 7A are mainly used. The components common to both of the discharge lamp lighting devices 7B are referred to. When denoted by reference character A, the components are limited to those of the discharge lamp lighting device 7A, and when denoted by reference character B, This is to limit the constituent members of the discharge lamp lighting device 7B.

As shown in FIG. 3, a discharge lamp lighting device 7A,
7B is a full-wave rectifier circuit 17, a smoothing capacitor 18, an inverter circuit 19, a control circuit 20, and a ballast choke 21.
, DC cut capacitor 22 and Emiless detection circuit 23
And a capacitor 24. A DC power supply circuit 27 is constituted by the full-wave rectifier circuit 17 and the smoothing capacitor 18, and the commercial AC power supply 28 is full-wave rectified by the full-wave rectifier circuit 17 and smoothed by the smoothing capacitor 18 to output a DC voltage. Has become. The inverter circuit 19 has a pair of switch elements 29 and 30 formed of an insulated gate field effect transistor (MOSFET). The pair of switch elements 29 and 30 are connected in series with each other to It is connected between both ends.

[0005] The ballast choke 21, the DC cut capacitor 22, and the discharge lamp 13 make use of the inverter load 3.
And an inverter load 31 between both ends of one switch element 30 of the pair of switch elements 29, 30.
Is connected. The switch elements 29 and 30 are alternately turned on and off by a drive signal from the control circuit 20, thereby converting the DC voltage from the DC power supply circuit 27 into a rectangular wave high-frequency voltage via the inverter circuit 19. Inverter load unit 3 including a ballast choke 21, a DC cut capacitor 22, and a discharge lamp 13
1 to turn on the discharge lamp 13.

The Emiless detection circuit 23 includes a detection resistor 36,
38, capacitors 39 and 40, and diodes 41 and 42, the voltage between both ends of the discharge lamp 13 is peak-converted (PP conversion) by the capacitor 39 and the diode 41, and is divided by the detection resistor 36 and the detection resistor 38. The pressurized voltage is smoothed by a capacitor 40 to obtain a detection voltage V (set to 4 V during normal lighting), and this detection voltage V is input to the control circuit 20. The detection voltage V of the Emiless detection circuit 23 is equal to the reference voltage Vref (the control circuit 20).
In this case, the control circuit 20 controls the on-duty of the switch elements 29 and 30 so as to reduce the output of the inverter circuit 19 or stop the oscillation of the inverter circuit 19. It has become.

That is, at the end of the life of the discharge lamp 13, a phenomenon called Emiless occurs. Emiless means the loss of the electron-emitting substance applied to the filament.There are two types of Emiless, one of which is Emiless, and the other is Emiless, where both filaments are Emiless. Tend to be. For this reason, the discharge lamp lighting devices 7A and 7B are provided with an Emiless detection circuit 23 for detecting the voltage between both ends of the discharge lamp 13, and when the voltage between both ends of the discharge lamp 13 rises to the reference voltage, the discharge lamp 1
3 is determined to be at the end of life, the output of the inverter circuit 19 is reduced, or the oscillation of the inverter circuit 19 is stopped, whereby the stress of the parts of the discharge lamp lighting devices 7A and 7B is reduced when the discharge lamp 13 emits light. It prevents the increase and heat generation.

[0008] In the lighting apparatus, the discharge lamp lighting device 7 has the same oscillation frequency and different wattage (output power).
A and 7B are incorporated, and as shown in FIG. 7, the wiring boards 6A and 6B of the discharge lamp lighting device 7A and the discharge lamp lighting device 7B are arranged so as to be line-symmetric with each other. Since the input portions 45A and 45B and the output portions 46A and 46B of the devices 7A and 7B face each other, it is easy to route the wiring and to integrate the discharge lamp lighting devices 7A and 7B into the lighting fixture. However, in this type of conventional lighting fixture, as shown in FIG. 7, the output line 11A of the discharge lamp lighting device 7A and the output line 11B of the discharge lamp lighting device 7B are connected to the wiring board 6A of the discharge lamp lighting device 7A. The output terminal block 12A of the discharge lamp lighting device 7A is disposed in the middle of the wiring board 6B of the discharge lamp lighting device 7B.
B is disposed outside the wiring boards 6A and 6B in close proximity to the output section 46B of the discharge lamp lighting device 7B.
Is disposed inside the wiring boards 6A and 6B, close to the output section 46A of the other discharge lamp lighting device 7A.

Further, a discharge lamp lighting device 7 to be incorporated in a lighting fixture.
Since a high voltage is applied to the resistors 36 and 38 of the Emiless detection circuits 23A and 23B in A and 7B, it is necessary to set the resistors 36 and 38 to high impedance (for example, 1.5 MΩ) in order to reduce the temperature. Was common.

[0010]

However, in the case of the above-mentioned conventional lighting equipment, although the cause is not clearly understood, the output line 11A of the discharge lamp lighting device 7A is connected to the other discharge lamp lighting device 7A.
A affects the detection voltage V of the Emiless detection circuit 23B of B, and the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B increases, whereby the discharge lamp 13B of the discharge lamp lighting device 7B is unexpectedly turned off. There was a problem. In view of the above problems, the present invention prevents the detection voltage of the Emiless detection circuit of the other discharge lamp lighting device from increasing due to the influence of the output line of one discharge lamp lighting device, and unexpectedly turns off the discharge lamp. The inconvenience of doing so is eliminated.

[0011]

The technical means of the present invention for solving this technical problem is to provide an Emiless detection circuit 23A, 23 for detecting an Emiless state by an increase in the discharge lamp voltage.
B, a plurality of discharge lamp lighting devices 7A and 7B are incorporated, and the output lines 11A and 11 of each discharge lamp lighting device 7A and 7B are provided.
B to the discharge lamps 13A, 13B through the output terminal blocks 12A, 12B.
In the lighting fixture in which the discharge lamps 13A and 13B are turned on by connecting the discharge lamps 13B respectively, the output lines 11A and 11B of the discharge lamp lighting devices 7A and 7B are connected to the Emiless detection circuit of the other discharge lamp lighting devices 7B and 7A. It is located at a position that does not affect the detection voltage V of 23A and 23B.

Another technical means of the present invention is a plurality of discharge lamp lighting devices 7 having Emiless detection circuits 23A and 23B for detecting an Emiless state by a rise in discharge lamp voltage.
A and 7B are incorporated, and discharge lamps 13A and 13B are connected to output lines 11A and 11B of the discharge lamp lighting devices 7A and 7B via output terminal blocks 12A and 12B, respectively.
In the lighting fixture configured to light the lamps 3A and 13B, the output lines 11A and 11A of the plurality of discharge lamp lighting devices 7A and 7B are used.
Wiring boards 6A, 6B of a plurality of discharge lamp lighting devices 7A, 7B so that at least one of 11B does not affect detection voltage V of Emiless detection circuits 23B, 23A of other discharge lamp lighting devices 7B, 7A. Of the discharge lamp lighting devices 7A, 7B of the self-discharge lamp lighting devices 7A, 7B.

Further, another technical means of the present invention is that the output lines 11A and 11B disposed near the wiring boards 6A and 6B of the discharge lamp lighting devices 7A and 7B are provided with a plurality of discharge lamp lighting devices 7A. , 7B are wired outside the space between the wiring boards 6A, 6B. Further, another technical means of the present invention is that the output terminal blocks 12A, 12B on the output lines 11A, 11B side arranged closer to the wiring boards 6A, 6B of the discharge lamp lighting devices 7A, 7B are provided with a plurality of output terminals. Discharge lamp lighting device 7
The point is that it is arranged closer to the wiring boards 6A, 6B of its own discharge lamp lighting devices 7A, 7B among the wiring boards 6A, 6B of A, 7B.

Further, another technical means of the present invention is that the output powers of the plurality of discharge lamp lighting devices 7A and 7B are different from each other, and the discharge lamp lighting devices 7A and 7B having higher output powers.
The output terminal blocks 12A and 12B of the discharge lamp lighting devices 7A and 7B having the lower output voltage are disposed outside.
2A and 12B are arranged inside. Also,
Another technical means of the present invention is to provide an Emiless detection circuit 23A, 23B for detecting an Emiless state by an increase in the discharge lamp voltage.
In a lighting fixture incorporating a plurality of discharge lamp lighting devices 7A, 7B having
7B, the detection resistor 3 of at least one of the Emiless detection circuits 23A and 23B is used.
6, 38 is that the combined impedance is set to 500 KΩ or less.

Another technical means of the present invention is a plurality of discharge lamp lighting devices 7 having Emiless detection circuits 23A and 23B for detecting an Emiless state by increasing the discharge lamp voltage.
A, 7B, in which the oscillation frequency of the plurality of discharge lamp lighting devices 7A, 7B is 1K
The point is that the distance is set to be HZ or more.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 (FIG. 2 is common to a conventional lighting fixture) show an embodiment of the present invention,
As shown in the figure, the lighting fixture includes a fixture base 2 attached to a ceiling 1 or the like, a shadow 3 and a metal cover 4 in the same manner as a conventional lighting fixture, and a circuit is wired to wiring boards 6A and 6B. The plurality of discharge lighting devices 7A and 7B are mounted on the instrument table 2 via the insulating plate 8. Thereby, the plurality of discharge lamp lighting devices 7A and 7B are incorporated in the lighting fixture, and the discharge lamps 13A and 13B are connected to the output lines 11A and 11B of the discharge lamp lighting devices 7A and 7B via the output terminal blocks 12A and 12B, respectively. Then, the discharge lamps 13A and 13B are turned on. The output terminal blocks 12A and 12B are fixed to the instrument table 2 or the insulating plate 8, respectively,
A and 13B are detachably connected to the sockets 14A and 14B by male and female fitting.

Here, in the example of FIG. 2, the discharge lamp 13A is, for example, a 100 W discharge lamp, and the discharge lamp 13B is, for example, 4 W.
0W discharge lamp, and discharge lamps 13A and 13B to be mounted
, The output power of the discharge lamp lighting devices 7A and 7B is 1
They are different for 00W and 40W. The plurality of discharge lighting devices 7A and 7B have the same circuit configuration. Further, the plurality of discharge lighting devices 7A and 7B are shown in FIG.
The circuit configuration is as shown in
The circuit configuration is the same as that of the conventional discharge lighting devices 7A and 7B of the lighting equipment, and is the same as that described in the related art, and the description of the circuit configuration is omitted here.

As in the case of the description of the prior art,
Reference numerals A and B are used to distinguish components on the discharge lighting device 7A side from components on the discharge lamp lighting device 7B side. When the reference numerals A and B are not attached, the components are mainly common to both the discharge lamp lighting device 7A and the discharge lamp lighting device 7B. When the reference symbol A is given, the discharge lamp lighting device 7A is used. And the reference numeral B indicates that the component is a component of the discharge lamp lighting device 7B.

The present invention has been made on the basis of the experimental results shown in FIGS. 5 and 6 for the luminaire having the above-described configuration. First, the experimental results shown in FIGS. 5 and 6 will be described. The graph of FIG. 5 shows the detection resistors 36 and 38 of the Emiless detection circuits 23A and 23B of the discharge lamp lighting devices 7A and 7B.
Of the discharge lamp lighting device 7A when the oscillation frequency of the discharge lamp lighting devices 7A and 7B is changed from each other by setting the combined impedance of the discharge lamp lighting devices to high impedance.
It is an experimental result which shows the relationship between the wiring position of A, and the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B.

In the graph of FIG. 5, “•” indicates that the oscillation frequencies of the discharge lamp lighting devices 7A and 7B coincide with each other, and “x” indicates that the oscillation frequencies of the discharge lamp lighting devices 7A and 7B are within ± 1 KHz. , “は” indicates that the oscillation frequencies of the discharge lamp lighting devices 7A and 7B are ± 1 KH from each other.
This is when the values differ by z or more. In the graph of FIG. 5, when the output line 11A of the discharge lamp lighting device 7A is wired over the wiring board 6A of the discharge lamp lighting device 7A as shown by the dotted line in FIG. When the output line 11A of the discharge lamp lighting device 7A is wired so as to pass through the middle of the wiring boards 6A and 6B of the discharge lamp lighting devices 7A and 7B as shown by a solid line in FIG. This shows a case where the output line 11A of the electric lamp lighting device 7A is wired so as to pass over the wiring board 6B of the other electric discharge lamp lighting device 7B.

From the experimental results shown in FIG. 5, as the oscillation frequencies of the discharge lamp lighting devices 7A and 7B differ from each other, the output line 11A of the discharge lamp lighting device 7A
It has been found that the detection voltage V of the Emiless detection circuit 23B of B is not affected. In addition, the discharge lamp lighting device 7A
The closer the output line 11A is to the wiring board 6A of the discharge lamp lighting devices 7A and 7B, the more the output line 11A of the discharge lamp lighting device 7A becomes the Emiless detection circuit 23B of the other discharge lamp lighting device 7B. Has no effect on the detection voltage V.

From the results of the experiment shown in FIG. 5, when the output line 11A of the discharge lamp lighting device 7A is wired so as to pass over the wiring board 6B of the other discharge lamp lighting device 7B as shown by the dashed line in FIG. In (), the Emiless detection circuit 23B may malfunction, but the output line 11A of the discharge lamp lighting device 7A is connected to the discharge lamp lighting device 7A as shown by the solid line in FIG.
When wiring is performed so as to pass through the middle of the wiring boards 6A and 6B of the discharge lamp lighting device 7A, the output line 11A of the discharge lamp lighting device 7A is connected to the wiring board 6A of the discharge lamp lighting device 7A as shown by a dotted line in FIG. It was found that when wiring was performed so as to pass, the Emiless detection circuit 23B did not malfunction.

FIG. 6 is a graph showing discharge lamp lighting devices 7A and 7A.
B, the discharge lamp lighting device 7
The output line 11 of the discharge lamp lighting device 7A when the combined impedance of the detection resistor 36 and the detection resistor 38 of B is changed.
It is an experimental result which calculated | required the relationship between the wiring position of A, and the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B.
In the graph of FIG. 6, “·” indicates the discharge lamp lighting device 7B.
When the combined impedance of the detection resistor 36 and the detection resistor 38 of the Emiless detection circuit 23B is set to 1.5 MΩ, “×” indicates the detection resistance 36 and the detection resistance 38 of the Emiless detection circuit 23B of the discharge lamp lighting device 7B. When the combined impedance is set to 700 KΩ, “△” indicates the detection resistance 3 of the Emiless detection circuit 23B of the discharge lamp lighting device 7B.
6 and the detection resistor 38 have a combined impedance of 500K.
Ω. Further, in the graph of FIG. 6, the discharge lamp lighting device 7 is indicated by a dotted line in FIG.
A output line 11A is connected to wiring board 6 of discharge lamp lighting device 7A.
When wiring is performed so as to pass over A, the output line 11A of the discharge lamp lighting device 7A is wired so as to pass through the middle of the wiring boards 6A and 6B of the discharge lamp lighting devices 7A and 7B as shown by a solid line in FIG. In this case, the case where the output line 11A of the discharge lamp lighting device 7A is wired so as to pass over the wiring board 6B of the other discharge lamp lighting device 7B as shown by the one-dot chain line in FIG.

From the experimental results of FIG. 6, the output line 11A of the discharge lamp lighting device 7A becomes smaller as the combined impedance of the detection resistor 36 and the detection resistor 38 of the Emiless detection circuit 23B of the discharge lamp lighting device 7B is set to a lower impedance.
Is the Emiless detection circuit 23 of the other discharge lamp lighting device 7B.
It was found that the detection voltage V of B was not affected. Further, the closer the output line 11A of the discharge lamp lighting device 7A is to the wiring board 6A of the discharge lamp lighting devices 7A and 7B, the more the output line 11A of the discharge lamp lighting device 7A.
Is the Emiless detection circuit 23 of the other discharge lamp lighting device 7B.
It was found that the detection voltage V of B was not affected.

Therefore, based on the experimental results shown in FIGS. 5 and 6, the present invention is made as follows. That is, in one embodiment of the present invention, as shown in FIG. 1, the output line 11A of the discharge lamp lighting device 7A is connected to the center line a between the wiring board 6A and the wiring board 6B by its own discharge lamp. The output terminal 11A of the discharge lamp lighting device 7A is disposed on the lighting device 7A side so that no output line 11A of the discharge lamp lighting device 7A is wired between the wiring board 6A and the wiring board 6B.
Is disposed on the discharge lamp lighting device 7A side with respect to the center line a between the wiring board 6A and the wiring board 6B. Therefore, the output line 11A of one discharge lamp lighting device 7A is connected to the detection voltage V of the Emiless detection circuit 23B of the other discharge lamp lighting device 7B.
So that the discharge lamp lighting devices 7 are not affected.
Of the wiring boards 6A and 6B of A and 7B, they are arranged closer to the wiring board 6A of their own discharge lamp lighting device 7A. In addition, the output line 11A arranged near the wiring board 6A of the discharge lamp lighting device 7A of the self is connected to the plurality of discharge lamp lighting devices 7A.
A and 7B are wired outside between the wiring boards 6A and 6B. Further, the output terminal block 12 on the side of the output line 11A disposed near the wiring board 6A of the discharge lamp lighting device 7A of the self.
A is the wiring board 6 of the plurality of discharge lamp lighting devices 7A and 7B.
A and 6B are arranged closer to the wiring board 6A of the discharge lamp lighting device 7A of the self. Thus, the output lines 11A and 11B of each of the discharge lamp lighting devices 7A and 7B are connected to the Emiless detection circuits 23A and 23B of the other discharge lamp lighting devices 7B and 7A.
Are arranged at positions that do not affect the detection voltage V.

The output terminal block 12A of the discharge lamp lighting device 7A having the higher output power among the plurality of discharge lamp lighting devices 7A and 7B having different output powers is connected to the outside of the wiring boards 6A and 6B. And the output terminal block 12B of the discharge lamp lighting device 7B with the lower output voltage is connected to the wiring board 6
A, 6B are arranged inside. In the case of this embodiment, the oscillation frequencies of the plurality of discharge lamp lighting devices 7A and 7B may be set to be equal to each other, or may be set to be separated from each other by 1 KHZ or more.
Further, in the case of this embodiment, the detection resistances of the plurality of Emiless detection circuits 23A and 23B may both be set to high impedance (for example, 1.5 MΩ), or the plurality of Emiless detection circuits 23A and 23B may be set. May be set to 500 KΩ or less.

According to the above embodiment, the output line 11A of the discharge lamp lighting device 7A is connected to the plurality of discharge lamp lighting devices 7A, 7A.
B is disposed closer to the wiring board 6A of its own discharge lamp lighting device 7A among the wiring boards 6A and 6B of B, so that the output of the discharge lamp lighting device 7A can be understood from the experimental results of FIGS. The line 11A does not affect the detection voltage V of the Emiless detection circuit 23B of the other discharge lamp lighting device 7B, so that the output lines 11A and 11B of both discharge lamp lighting devices 7A and 7B are turned on. Apparatus 7B, 7
A is disposed at a position that does not affect the detection voltage V of the Aemiles detection circuits 23A and 23B of A, so that the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B rises and the discharge lamp lighting device 7B The discharge lamp 13B is not turned off unexpectedly, and the discharge lamps 13A, 13B of both the discharge lamp lighting devices 7A, 7B can be satisfactorily lit.

Next, another embodiment of the present invention will be described. One of the Emiless detection circuits 23A and 23B of the plurality of discharge lamp lighting devices 7A and 7B is used.
When the combined impedance of the 3B detection resistors 36 and 38 is 5
It is set to 00KΩ or less. In the case of this embodiment, as shown in FIG. 7, the output line 11A and the output line 11B are arranged in the middle between the wiring board 6A and the wiring board 6B, as in the conventional case, and the discharge lamp lighting device 7A Output terminal block 12A
May be arranged outside the wiring boards 6A, 6B in close proximity to the output portion 46B of the other discharge lamp lighting device 7B, or as shown in FIG. May be arranged near the wiring board 6A of the discharge lamp lighting device 7A.

In the case of this embodiment, the oscillation frequencies of the plurality of discharge lamp lighting devices 7A and 7B may be set to be the same as each other, or may be set so as to be separated from each other by 1 KHZ or more. Is also good. According to the above embodiment, the detection resistors 36 and 3 of one Emiless detection circuit 23B are used.
8, the output impedance 11A of the discharge lamp lighting device 7A is connected to the Emiless detection circuit 23B of the other discharge lamp lighting device 7B, as can be seen from the experimental results of FIG. The detection voltage V is no longer affected, and the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B rises.
B discharge lamp 13B does not unexpectedly go out, and discharge lamps 13A, 13B of both discharge lamp lighting devices 7A, 7B.
Can be satisfactorily lit.

In another embodiment of the present invention, the oscillation frequency of a plurality of discharge lamp lighting devices 7A and 7B is
They are set to be separated from each other by 1 KHZ or more.
In the case of this embodiment, as shown in FIG. 7, the output line 11A and the output line 11B are arranged in the middle between the wiring board 6A and the wiring board 6B, as in the conventional case, and the discharge lamp lighting device 7A The output terminal block 12A may be disposed outside the wiring boards 6A, 6B in close proximity to the output section 46B of the other discharge lamp lighting device 7B, or as shown in FIG. The output line 11A of the electric lamp lighting device 7A may be arranged closer to the wiring board 6A of the discharge lamp lighting device 7A.

In the case of this embodiment, the detection resistances of the plurality of Emiless detection circuits 23A and 23B may both be set to high impedance (for example, 1.5 MΩ), or the plurality of Emiless detection circuits may be set. 23A, 23B
May be set to 500 KΩ or less. According to the above embodiment, the oscillation frequencies of the discharge lamp lighting devices 7A and 7B are set so as to be separated from each other by 1 KHZ or more. As can be seen from the experimental results in FIG.
The output line 11A of A does not affect the detection voltage V of the Emiless detection circuit 23B of the other discharge lamp lighting device 7B, and the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B as in the related art. Rises and the discharge lamp 13B of the discharge lamp lighting device 7B does not unexpectedly go out, and the discharge lamps 13 of both the discharge lamp lighting devices 7A and 7B do not go out.
A and 13B can be satisfactorily lit.

In the above embodiment, although the cause is unknown, the output line 11A of the discharge lamp lighting device 7A affects the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B. In order not to affect the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B, the discharge lamp lighting device 7A of the output lines 11A and 11B of the plurality of discharge lamp lighting devices 7A and 7B is not affected. Is arranged closer to the wiring board 6A of the discharge lamp lighting device 7A among the wiring boards 6A and 6B of the plurality of discharge lamp lighting devices 7A and 7B. The output line 11B of the lighting device 7B is connected to the discharge lamp lighting device 7B.
When the detection voltage V of the Aemiles detection circuit 23A of A is affected, a plurality of discharge lamps are turned on so as not to affect the detection voltage V of the Emiless detection circuit 23A of the discharge lamp lighting device 7A. Output lines 11 of devices 7A and 7B
Output line 11 of discharge lamp lighting device 7B among A and 11B
Only B may be arranged closer to the wiring board 6B of the discharge lamp lighting device 7B among the wiring boards 6A and 6B of the plurality of discharge lamp lighting devices 7A and 7B. The output lines 11A and 11B of both the discharge lamp lighting devices 7A and 7B are
When the detection voltages V of the Emiless detection circuits 23B and 23A of the other discharge lamp lighting devices 7B and 7A are affected, the detection voltages of the Emiless detection circuits 23B and 23A of both the discharge lamp lighting devices 7B and 7A are affected. In order not to affect V, a plurality of discharge lamp lighting devices 7A, 7
Both the output lines 11A and 11B of B are arranged closer to the wiring boards 6A and 6B of the discharge lamp lighting devices 7A and 7B among the wiring boards 6A and 6B of the plurality of discharge lamp lighting devices 7A and 7B. What should I do?

In the above embodiment, although the cause is unknown, the output line 11A of the discharge lamp lighting device 7A affects the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B. In order not to affect the detection voltage V of the Emiless detection circuit 23B of the discharge lamp lighting device 7B, one of the Emiless detection circuits 23A and 23B of the plurality of discharge lamp lighting devices 7A and 7B is used. Only the combined impedance of the detection resistors 36 and 38 of the discharge lamp lighting device 23B is set to 500 KΩ or less. Instead, the output line 11B of the discharge lamp lighting device 7B is connected to the detection voltage of the Emiless detection circuit 23A of the discharge lamp lighting device 7A. When the voltage V is affected, the detection voltage V of the Emiless detection circuit 23A of the discharge lamp lighting device 7A is not affected. Of the output lines 11A and 11B of the discharge lamp lighting devices 7A and 7B, the combined impedance of the detection resistors 36 and 38 of the Emiless detection circuit 23A of the discharge lamp lighting device 7A may be set to 500 KΩ or less. . The output lines 11A and 11B of both discharge lamp lighting devices 7A and 7B are connected to the other discharge lamp lighting device 7 respectively.
When the detection voltage V of the Emiless detection circuits 23B and 23A of the discharge lamps B and 7A is affected, the detection voltage V of the Emiless detection circuits 23B and 23A of the discharge lamp lighting devices 7B and 7A is not affected. In order to make the Emiless detection circuit 23 of both the plurality of discharge lamp lighting devices 7A and 7B
The combined impedance of the detection resistors 36 and 38 of A and 23B may be set to 500 KΩ or less.

[0034]

According to the present invention, the output lines 13A and 13B of one of the discharge lamp lighting devices 7A and 7B affect the detection voltage V of the Emiless detection circuits 23B and 23A of the other discharge lamp lighting device 7B and 7A. And output line 1
Discharge lamp lighting devices 7B, 7A due to the influence of 3A, 13B
Can be reliably prevented from increasing the detection voltage V of the Emiless detection circuits 23B, 23A, and the inconvenience of unexpectedly turning off the discharge lamps 13A, 13B can be eliminated.

[Brief description of the drawings]

FIG. 1 is a bottom view showing an embodiment of the present invention.

FIG. 2 is a schematic side view showing an embodiment of the present invention which is common to a conventional example.

FIG. 3 is a circuit diagram of a discharge lamp lighting device showing an embodiment of the present invention which is common to a conventional example.

FIG. 4 is a bottom view for explaining experimental conditions.

FIG. 5 is a graph showing experimental results.

FIG. 6 is a graph showing experimental results.

FIG. 7 is a plan view showing a conventional example.

[Explanation of symbols]

 6A Wiring board 6B Wiring board 7A Discharge lamp lighting device 7B Discharge lamp lighting device 11A Output line 11B Output line 12A Output terminal block 12B Output terminal block 13A Discharge lamp 13B Discharge lamp 23A Emiless detection circuit 23B Emiless detection circuit

Claims (7)

[Claims] A plurality of discharge lamp lighting devices (7A, 7B) each having an Emiless detection circuit (23A, 23B) for detecting an Emiless state by a rise in discharge lamp voltage are incorporated, and each discharge lamp lighting device (7A, 7B) is provided. ) Output lines (11A, 11A)
B) to the discharge lamps (13A, 13B) via output terminal blocks (12A, 12B).
A, 13B), the output line (11A, 1B) of each discharge lamp lighting device (7A, 7B).
1B) is provided at a position which does not affect the detection voltage V of the Emiless detection circuits (23A, 23B) of the other discharge lamp lighting devices (7B, 7A). 2. A plurality of discharge lamp lighting devices (7A, 7B) each having an Emiless detection circuit (23A, 23B) for detecting an Emiless state by increasing a discharge lamp voltage, and each discharge lamp lighting device (7A, 7B). ) Output lines (11A, 11A)
B) to the discharge lamps (13A, 13B) via output terminal blocks (12A, 12B).
A, 13B), the output lines (11A, 7B) of the plurality of discharge lamp lighting devices (7A, 7B).
A, 11B) is at least one of the Emiless detection circuits (23B, 2B) of the other discharge lamp lighting device (7B, 7A).
3A) so as not to affect the detection voltage V of the plurality of discharge lamp lighting devices (7A, 7B).
A lighting fixture characterized by being arranged near the wiring board (6A, 6B) of its own discharge lamp lighting device (7A, 7B) in B). 3. The self-discharge lamp lighting device (7A, 7
The output lines (11A, 11B) arranged near the wiring board (6A, 6B) of FIG.
The lighting device according to claim 2, wherein the lighting device is wired outside the portion between the wiring boards (6 </ b> A, 6 </ b> B). 4. The self-discharge lamp lighting device (7A, 7
B) The output terminal block (12A, 12B) on the side of the output line (11A, 11B) arranged near the wiring board (6A, 6B)
Are their own discharge lamp lighting devices (7A, 6B) among the wiring boards (6A, 6B) of the plurality of discharge lamp lighting devices (7A, 7B).
3. The lighting fixture according to claim 2, wherein the lighting fixture is disposed near the wiring board (6 </ b> A, 6 </ b> B). 5. The plurality of discharge lamp lighting devices (7A, 7
B) output powers are different from each other, and the output terminal block (12) of the discharge lamp lighting device (7A, 7B) with the higher output power.
A, 12B) are disposed outside, and the output terminal block (12A, 1B) of the discharge lamp lighting device (7A, 7B) having the lower output voltage.
3. The lighting device according to claim 1, wherein 2B) is disposed inside. 6. A lighting apparatus incorporating a plurality of discharge lamp lighting devices (7A, 7B) having an Emiless detection circuit (23A, 23B) for detecting an Emiless state by increasing a discharge lamp voltage, wherein the plurality of discharge lamps are provided. Detection resistors (36, 3) of at least one of the Emiless detection circuits (23A, 23B) of the Emiless detection circuits (23A, 23B) of the lighting devices (7A, 7B).
8) The lighting fixture, wherein the combined impedance is set to 500 KΩ or less. 7. A lighting fixture incorporating a plurality of discharge lamp lighting devices (7A, 7B) having an Emiless detection circuit (23A, 23B) for detecting an Emiless state by a rise in discharge lamp voltage, wherein the plurality of discharge lamps are provided. An illuminator characterized in that the oscillating frequencies of the lighting devices (7A, 7B) are set to be separated from each other by 1 KHZ or more.